/* ============================================================
   C# Trainer - FiSi Edition | style.css v4
   Designthese: ruhiges Pruefungslabor mit klarer Lernhierarchie
   ============================================================ */

*,
*::before,
*::after {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}

:root {
  --bg: #0d0c0c;
  --bg-strong: #171514;
  --bg-accent: #221f1d;
  --surface: color-mix(in srgb, #f6f2eb 6%, transparent);
  --surface-strong: rgba(25, 23, 22, 0.94);
  --surface-muted: rgba(18, 17, 16, 0.92);
  --surface-dark: #11100f;
  --surface-elevated: rgba(31, 28, 27, 0.92);

  --text-strong: #f6f2eb;
  --text-default: #ccc4ba;
  --text-muted: #ada398;
  --text-soft: #8b8177;
  --text-on-dark: #f6f2eb;

  --line: color-mix(in srgb, #f6f2eb 12%, transparent);
  --line-strong: color-mix(in srgb, #f6f2eb 18%, transparent);
  --line-soft: color-mix(in srgb, #f6f2eb 8%, transparent);
  --border: color-mix(in srgb, #f6f2eb 12%, transparent);
  --focus: rgba(255, 106, 0, 0.28);

  --primary: #ff6a00;
  --primary-strong: #ff8b33;
  --primary-soft: rgba(255, 106, 0, 0.12);
  --secondary: #f3b35d;
  --secondary-soft: rgba(243, 179, 93, 0.12);
  --accent: #e6e0d7;
  --accent-soft: rgba(230, 224, 215, 0.08);

  --success: #73d7a0;
  --success-soft: rgba(115, 215, 160, 0.12);
  --success-subtle: rgba(115, 215, 160, 0.12);
  --warning: #f3b35d;
  --warning-soft: rgba(243, 179, 93, 0.12);
  --warning-subtle: rgba(243, 179, 93, 0.12);
  --danger: #f08d86;
  --danger-soft: rgba(240, 141, 134, 0.12);
  --danger-subtle: rgba(240, 141, 134, 0.12);

  --clr-lvl0: #73d7a0;
  --clr-lvl1: #d9b766;
  --clr-lvl2: #d1a158;
  --clr-lvl3: #c58c49;
  --clr-lvl4: #c67435;
  --clr-lvl5: #d08b63;
  --clr-lvl6: #d79c74;
  --clr-lvl7: #c96e3d;
  --clr-lvl8: #ff6a00;

  --shadow-soft: 0 24px 80px rgba(0, 0, 0, 0.28);
  --shadow-card: 0 16px 36px rgba(0, 0, 0, 0.22);
  --shadow-floating: 0 24px 50px rgba(0, 0, 0, 0.34);

  --font-display: "Iowan Old Style", "Palatino Linotype", "Book Antiqua", Georgia, serif;
  --font-sans: "IBM Plex Sans", "Avenir Next", "Segoe UI", sans-serif;
  --font-mono: "JetBrains Mono", "IBM Plex Mono", monospace;

  --r-sm: 6px;
  --r-md: 10px;
  --r-lg: 14px;
  --r-xl: 22px;

  --sp-1: 4px;
  --sp-2: 8px;
  --sp-3: 12px;
  --sp-4: 16px;
  --sp-5: 20px;
  --sp-6: 24px;
  --sp-7: 28px;
  --sp-8: 32px;
  --sp-10: 40px;
  --sp-12: 48px;

  --header-h: 82px;
  --sidebar-w: 360px;

  --ease: cubic-bezier(0.22, 1, 0.36, 1);
  --fast: 140ms;
  --normal: 220ms;
  --slow: 360ms;
}

html {
  font-size: 16px;
  scroll-behavior: smooth;
  -webkit-font-smoothing: antialiased;
}

body {
  min-height: 100vh;
  font-family: var(--font-sans);
  color: var(--text-default);
  background:
    radial-gradient(circle at top left, rgba(255, 106, 0, 0.14), transparent 26rem),
    linear-gradient(180deg, rgba(246, 242, 235, 0.06), transparent 28rem),
    var(--bg);
  line-height: 1.6;
}

body.sidebar-open,
body.stats-open {
  overflow: hidden;
}

body::before {
  content: "";
  position: fixed;
  inset: 0;
  background-image:
    linear-gradient(color-mix(in srgb, var(--text-strong) 2.4%, transparent) 1px, transparent 1px),
    linear-gradient(90deg, color-mix(in srgb, var(--text-strong) 2.4%, transparent) 1px, transparent 1px);
  background-size: 32px 32px;
  pointer-events: none;
  opacity: 0.16;
}

a {
  color: inherit;
}

button,
input,
textarea,
select {
  font: inherit;
}

button:focus-visible,
a:focus-visible {
  outline: 3px solid var(--focus);
  outline-offset: 2px;
}

.skip-link {
  position: absolute;
  left: 16px;
  top: -56px;
  z-index: 200;
  padding: 10px 14px;
  border: 1px solid var(--line-strong);
  background: var(--primary);
  color: #2a1100;
  font-family: var(--font-mono);
  font-size: 0.76rem;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  text-decoration: none;
}

.skip-link:focus {
  top: 16px;
}

::selection {
  background: rgba(255, 106, 0, 0.24);
  color: var(--text-strong);
}

::-webkit-scrollbar {
  width: 10px;
  height: 10px;
}

::-webkit-scrollbar-track {
  background: transparent;
}

::-webkit-scrollbar-thumb {
  background: color-mix(in srgb, var(--text-strong) 10%, transparent);
  border: 2px solid transparent;
  border-radius: 999px;
  background-clip: padding-box;
}

::-webkit-scrollbar-thumb:hover {
  background: color-mix(in srgb, var(--primary) 34%, transparent);
  border: 2px solid transparent;
  background-clip: padding-box;
}

.file-warning {
  position: sticky;
  top: 0;
  z-index: 120;
  display: flex;
  align-items: center;
  gap: var(--sp-3);
  padding: var(--sp-3) var(--sp-6);
  background: rgba(42, 28, 12, 0.96);
  border-bottom: 1px solid color-mix(in srgb, var(--warning) 28%, transparent);
  color: var(--warning);
  font-size: 0.95rem;
}

.fw-steps {
  display: inline-flex;
  flex-wrap: wrap;
  gap: 6px;
}

.fw-step {
  padding: 2px 10px;
  border-radius: 999px;
  border: 1px solid rgba(251, 191, 36, 0.18);
  background: rgba(251, 191, 36, 0.08);
  font-family: var(--font-mono);
  font-size: 0.8rem;
}

.header {
  position: sticky;
  top: 0;
  z-index: 110;
  display: flex;
  align-items: center;
  gap: var(--sp-4);
  height: var(--header-h);
  padding: 0 var(--sp-6);
  border-bottom: 1px solid var(--line);
  background: rgba(13, 12, 12, 0.9);
  backdrop-filter: blur(16px);
}

.header-brand-block,
.header-brand {
  display: flex;
  align-items: center;
  gap: var(--sp-4);
  min-width: 0;
}

.header-dot {
  width: 14px;
  height: 14px;
  border-radius: 50%;
  background: var(--primary);
  box-shadow: 0 0 0 5px rgba(255, 106, 0, 0.12);
  flex: 0 0 auto;
}

.header-brand-copy {
  display: flex;
  flex-direction: column;
  min-width: 0;
}

.header-brand-title {
  font-family: var(--font-display);
  font-size: 1.4rem;
  font-weight: 400;
  color: var(--text-strong);
  letter-spacing: -0.04em;
}

.header-brand-subtitle {
  max-width: 42ch;
  font-size: 0.8rem;
  color: var(--text-muted);
  line-height: 1.5;
}

.header-brand-credit {
  display: flex;
  align-items: center;
  gap: 10px;
  margin-top: 4px;
  min-width: 0;
  flex-wrap: wrap;
}

.header-credit-name,
.header-credit-link {
  font-size: 0.74rem;
  color: var(--text-soft);
}

.header-credit-name {
  white-space: nowrap;
}

.header-credit-link {
  text-decoration: none;
  color: var(--primary);
}

.header-credit-link:hover {
  color: var(--text-strong);
  text-decoration: underline;
}

.header-tag,
.header-stage,
.header-badge,
.badge {
  display: inline-flex;
  align-items: center;
  border-radius: 999px;
  border: 1px solid transparent;
  font-family: var(--font-mono);
  letter-spacing: 0.02em;
}

.header-tag {
  padding: 6px 12px;
  background: color-mix(in srgb, var(--text-strong) 5%, transparent);
  border-color: var(--line);
  color: var(--text-muted);
  font-size: 0.7rem;
  text-transform: uppercase;
}

.header-spacer {
  flex: 1;
}

.header-stage {
  padding: 8px 14px;
  background: color-mix(in srgb, var(--text-strong) 4%, transparent);
  border-color: var(--line);
  color: var(--text-default);
  font-size: 0.78rem;
  max-width: 360px;
}

.header-status {
  display: flex;
  align-items: center;
  gap: var(--sp-3);
}

.header-badge {
  padding: 8px 12px;
  background: var(--success-soft);
  border-color: color-mix(in srgb, var(--success) 24%, transparent);
  color: var(--success);
  font-size: 0.76rem;
  white-space: nowrap;
}

.header-progress {
  display: flex;
  align-items: center;
  gap: var(--sp-3);
  padding: 10px 14px;
  border-radius: 999px;
  background: color-mix(in srgb, var(--text-strong) 4%, transparent);
  border: 1px solid var(--line);
  font-family: var(--font-mono);
  font-size: 0.78rem;
  color: var(--text-muted);
}

.header-progress-bar {
  width: 148px;
  height: 8px;
  border-radius: 999px;
  background: rgba(255, 255, 255, 0.08);
  overflow: hidden;
}

.header-progress-fill {
  height: 100%;
  border-radius: inherit;
  background: linear-gradient(90deg, #ff6a00 0%, #ff8b33 100%);
  transition: width var(--slow) var(--ease);
}

.sidebar-toggle {
  display: none;
  align-items: center;
  justify-content: center;
  width: 42px;
  height: 42px;
  border: 1px solid var(--line);
  border-radius: 14px;
  background: rgba(255, 255, 255, 0.03);
  color: var(--text-strong);
  cursor: pointer;
  transition: transform var(--fast) var(--ease), border-color var(--fast) var(--ease);
}

.sidebar-toggle:hover {
  transform: translateY(-1px);
  border-color: var(--line-strong);
}

.app-layout {
  display: grid;
  grid-template-columns: minmax(280px, var(--sidebar-w)) minmax(0, 1fr);
  gap: var(--sp-6);
  max-width: 1600px;
  margin: 0 auto;
  padding: var(--sp-6);
  position: relative;
  z-index: 1;
}

.sidebar {
  position: sticky;
  top: calc(var(--header-h) + var(--sp-6));
  align-self: start;
  max-height: calc(100vh - var(--header-h) - var(--sp-8));
  border: 1px solid var(--line);
  border-radius: var(--r-xl);
  background: rgba(12, 16, 23, 0.88);
  box-shadow: var(--shadow-soft);
  overflow: hidden;
  display: flex;
  flex-direction: column;
}

.sidebar-scroll {
  flex: 1;
  min-height: 0;
  overflow-y: auto;
  padding: var(--sp-6);
}

.sidebar-intro {
  display: grid;
  gap: var(--sp-3);
  padding-bottom: var(--sp-4);
  border-bottom: 1px solid var(--line-soft);
  margin-bottom: var(--sp-4);
}

/* ── Compact sidebar elements ──────────────────────────── */
.sidebar-title-compact {
  font-size: 0.95rem;
  color: var(--text-strong);
  display: block;
  margin-top: 2px;
}

.sidebar-meta-compact {
  font-size: 0.7rem;
  color: var(--text-soft);
}

.sidebar-metrics-compact {
  display: flex;
  gap: var(--sp-3);
  font-size: 0.75rem;
  color: var(--text-muted);
}

.sidebar-metrics-compact strong {
  color: var(--text-strong);
}

.sidebar-actions-compact {
  display: flex;
  flex-direction: column;
  gap: var(--sp-2);
}

.sidebar-quick-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(36px, 1fr));
  gap: 4px;
}

.sidebar-qbtn {
  display: flex;
  align-items: center;
  justify-content: center;
  width: 100%;
  aspect-ratio: 1;
  font-size: 1rem;
  background: var(--surface-glass);
  border: 1px solid var(--border);
  border-radius: var(--radius-sm);
  cursor: pointer;
  transition: all var(--duration-fast) var(--ease);
  padding: 0;
}

.sidebar-qbtn:hover {
  background: rgba(255,106,0,0.1);
  border-color: var(--primary);
  transform: scale(1.08);
}

.sidebar-topbar {
  display: flex;
  align-items: flex-start;
  justify-content: space-between;
  gap: var(--sp-4);
}

.sidebar-close {
  display: none;
  align-items: center;
  justify-content: center;
  width: 40px;
  height: 40px;
  border: 1px solid var(--line);
  border-radius: 14px;
  background: rgba(255, 255, 255, 0.04);
  color: var(--text-strong);
  cursor: pointer;
  flex: 0 0 auto;
}

.sidebar-close:hover {
  border-color: var(--line-strong);
  background: rgba(255, 255, 255, 0.08);
}

.sidebar-kicker,
.task-box-label,
.editor-brief-label,
.hero-stat-label,
.inspector-heading,
.sidebar-group-meta,
.check-expected-label,
.output-title,
.card-header-left {
  font-family: var(--font-mono);
  text-transform: uppercase;
  letter-spacing: 0.08em;
}

.sidebar-kicker {
  font-size: 0.74rem;
  color: var(--primary);
}

.sidebar-title {
  font-family: var(--font-display);
  font-size: 2rem;
  line-height: 1.02;
  letter-spacing: -0.05em;
  color: var(--text-strong);
}

.sidebar-copy {
  font-size: 0.98rem;
  color: var(--text-muted);
}

.sidebar-current-card {
  display: grid;
  gap: 4px;
  padding: var(--sp-4);
  border-radius: var(--r-md);
  border: 1px solid color-mix(in srgb, var(--primary) 22%, transparent);
  background: linear-gradient(180deg, color-mix(in srgb, var(--primary) 10%, transparent), rgba(17, 16, 15, 0.92));
}

.sidebar-current-label {
  font-family: var(--font-mono);
  font-size: 0.68rem;
  text-transform: uppercase;
  letter-spacing: 0.18em;
  color: var(--primary);
}

.sidebar-current-card strong {
  font-family: var(--font-display);
  font-size: 1.08rem;
  line-height: 1.08;
  letter-spacing: -0.03em;
  color: var(--text-strong);
}

.sidebar-current-card span:last-child {
  font-size: 0.84rem;
  color: var(--text-muted);
}

.sidebar-metrics {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: var(--sp-3);
}

.sidebar-metric {
  display: grid;
  gap: 2px;
  padding: var(--sp-4);
  border-radius: var(--r-md);
  border: 1px solid var(--line-soft);
  background: color-mix(in srgb, var(--text-strong) 4%, transparent);
}

.sidebar-metric-value {
  font-family: var(--font-display);
  font-size: 1.45rem;
  font-weight: 700;
  color: var(--text-strong);
  letter-spacing: -0.04em;
}

.sidebar-metric-label {
  font-size: 0.8rem;
  color: var(--text-muted);
}

.sidebar-actions {
  display: grid;
  gap: var(--sp-3);
  margin-top: var(--sp-4);
}

.sidebar-action-row {
  display: flex;
  gap: var(--sp-3);
}

.sidebar-action-row-tight .sidebar-action {
  min-height: 40px;
}

.sidebar-action {
  flex: 1;
  min-height: 44px;
  border-radius: 999px;
  border: 1px solid var(--line);
  padding: 0 14px;
  font-family: var(--font-mono);
  font-size: 0.72rem;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  cursor: pointer;
  transition:
    transform var(--fast) var(--ease),
    border-color var(--fast) var(--ease),
    background var(--fast) var(--ease),
    color var(--fast) var(--ease);
}

.sidebar-action:hover:not(:disabled) {
  transform: translateY(-1px);
}

.sidebar-action:disabled {
  opacity: 0.45;
  cursor: default;
}

.sidebar-action-primary {
  background: var(--primary);
  border-color: color-mix(in srgb, var(--primary) 80%, black 20%);
  color: #2a1100;
}

.sidebar-action-ghost {
  background: color-mix(in srgb, var(--text-strong) 4%, transparent);
  color: var(--text-default);
}

.sidebar-action-ghost:hover:not(:disabled) {
  background: color-mix(in srgb, var(--text-strong) 6%, transparent);
  color: var(--text-strong);
}

.sidebar-note {
  margin: 0;
  font-size: 0.84rem;
  line-height: 1.6;
  color: var(--text-muted);
}

.sidebar-tools {
  display: grid;
  gap: var(--sp-3);
  margin: var(--sp-5) 0;
}

.sidebar-search-label {
  font-size: 0.72rem;
  color: var(--text-soft);
}

.sidebar-search {
  min-height: 44px;
  padding: 0 14px;
  border: 1px solid var(--line);
  border-radius: 999px;
  background: color-mix(in srgb, var(--text-strong) 4%, transparent);
  color: var(--text-strong);
}

.sidebar-search::placeholder {
  color: var(--text-soft);
}

.sidebar-filters {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
}

.sidebar-filter {
  min-height: 36px;
  padding: 0 12px;
  border-radius: 999px;
  border: 1px solid var(--line);
  background: transparent;
  color: var(--text-muted);
  cursor: pointer;
}

.sidebar-filter.is-active {
  background: color-mix(in srgb, var(--primary) 12%, transparent);
  border-color: color-mix(in srgb, var(--primary) 26%, transparent);
  color: var(--primary);
}

.sidebar-empty {
  padding: var(--sp-4);
  border: 1px dashed var(--line-soft);
  border-radius: var(--r-md);
  color: var(--text-muted);
}

.sidebar-groups {
  display: grid;
  gap: var(--sp-5);
}

.sidebar-group {
  display: grid;
  gap: var(--sp-3);
}

.sidebar-group-head {
  display: flex;
  justify-content: space-between;
  align-items: center;
}

.sidebar-group-copy {
  display: flex;
  align-items: flex-start;
  gap: var(--sp-3);
}

.sidebar-group-dot {
  width: 12px;
  height: 12px;
  border-radius: 50%;
  margin-top: 6px;
  box-shadow: 0 0 0 5px rgba(255, 255, 255, 0.03);
}

.sidebar-group-title {
  font-family: var(--font-display);
  font-size: 1rem;
  font-weight: 700;
  color: var(--text-strong);
  letter-spacing: -0.03em;
}

.sidebar-group-meta {
  font-size: 0.72rem;
  color: var(--text-soft);
}

.sidebar-group-list {
  display: grid;
  gap: 10px;
}

.ex-item {
  display: grid;
  grid-template-columns: auto minmax(0, 1fr) auto;
  gap: var(--sp-3);
  align-items: center;
  width: 100%;
  padding: 14px 16px;
  border: 1px solid transparent;
  border-radius: 18px;
  background: transparent;
  text-align: left;
  color: inherit;
  cursor: pointer;
  transition:
    transform var(--fast) var(--ease),
    background var(--fast) var(--ease),
    border-color var(--fast) var(--ease),
    box-shadow var(--fast) var(--ease);
}

.ex-item:hover {
  transform: translateY(-1px);
  background: color-mix(in srgb, var(--text-strong) 4%, transparent);
  border-color: var(--line-soft);
  box-shadow: var(--shadow-card);
}

.ex-item.active {
  background: linear-gradient(180deg, color-mix(in srgb, var(--primary) 9%, transparent), rgba(17, 16, 15, 0.92));
  border-color: color-mix(in srgb, var(--primary) 22%, transparent);
}

.ex-item[aria-current="true"] .ex-check {
  color: var(--primary);
}

.ex-item.done {
  background: color-mix(in srgb, var(--success) 10%, transparent);
}

.ex-num,
.nav-pos,
.editor-lang,
.output-meta,
.check-expected,
.file-warning code {
  font-family: var(--font-mono);
}

.ex-num {
  font-size: 0.78rem;
  color: var(--text-soft);
}

.ex-info {
  display: grid;
  gap: 3px;
  min-width: 0;
}

.ex-name {
  font-size: 0.96rem;
  font-weight: 600;
  color: var(--text-strong);
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
}

.ex-topic {
  font-size: 0.82rem;
  color: var(--text-muted);
}

.ex-check {
  font-size: 0.9rem;
  color: var(--text-soft);
}

.ex-item.done .ex-check {
  color: var(--success);
}

.stats-backdrop {
  display: none;
}

.stats-panel {
  position: fixed;
  top: var(--sp-4);
  right: var(--sp-4);
  bottom: var(--sp-4);
  width: min(720px, calc(100vw - 2rem));
  padding: var(--sp-6);
  border: 1px solid var(--line);
  border-radius: var(--r-xl);
  background: rgba(13, 12, 12, 0.96);
  box-shadow: var(--shadow-floating);
  backdrop-filter: blur(18px);
  z-index: 220;
  transform: translateX(calc(100% + 2rem));
  transition: transform var(--normal) var(--ease);
  overflow: auto;
}

.stats-panel.open {
  transform: translateX(0);
}

.stats-backdrop.show {
  display: block;
  position: fixed;
  inset: 0;
  background: rgba(0, 0, 0, 0.46);
  backdrop-filter: blur(4px);
  z-index: 210;
}

.stats-panel-head {
  display: flex;
  align-items: flex-start;
  justify-content: space-between;
  gap: var(--sp-4);
  margin-bottom: var(--sp-5);
}

.stats-panel-title {
  margin: 6px 0 0;
  font-family: var(--font-display);
  font-size: clamp(1.9rem, 3vw, 2.8rem);
  line-height: 0.96;
  color: var(--text-strong);
}

.stats-close {
  min-width: 42px;
  min-height: 42px;
  border-radius: 999px;
  border: 1px solid var(--line);
  background: transparent;
  color: var(--text-default);
  cursor: pointer;
}

.stats-panel-body {
  display: grid;
  gap: var(--sp-5);
}

.stats-grid {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: var(--sp-4);
}

.stats-card,
.stats-section,
.onboarding-panel {
  border: 1px solid var(--line);
  border-radius: var(--r-lg);
  background: rgba(19, 18, 17, 0.9);
  box-shadow: var(--shadow-card);
}

.stats-card {
  display: grid;
  gap: 8px;
  padding: var(--sp-5);
}

.stats-card strong {
  font-family: var(--font-display);
  font-size: 1.7rem;
  line-height: 0.94;
  color: var(--text-strong);
}

.stats-card span:last-child {
  color: var(--text-muted);
}

.stats-card-highlight {
  background: linear-gradient(180deg, color-mix(in srgb, var(--primary) 10%, transparent), rgba(19, 18, 17, 0.92));
}

.stats-label {
  font-size: 0.72rem;
  color: var(--text-soft);
}

.stats-detail-grid {
  display: grid;
  gap: var(--sp-4);
  grid-template-columns: minmax(0, 1.1fr) minmax(0, 0.9fr);
}

.stats-section {
  padding: var(--sp-5);
  display: grid;
  gap: var(--sp-4);
}

.stats-section-head {
  display: flex;
  justify-content: space-between;
  gap: var(--sp-3);
  align-items: baseline;
}

.stats-section-head h3 {
  margin: 0;
  font-family: var(--font-display);
  font-size: 1.35rem;
  color: var(--text-strong);
}

.stats-section-head span,
.stats-empty {
  color: var(--text-muted);
  font-size: 0.9rem;
}

.stats-category-list {
  display: grid;
  gap: var(--sp-4);
}

.stats-category-row {
  display: grid;
  gap: 8px;
}

.stats-category-head {
  display: flex;
  justify-content: space-between;
  gap: var(--sp-3);
  color: var(--text-default);
}

.stats-bar {
  height: 10px;
  border-radius: 999px;
  background: color-mix(in srgb, var(--text-strong) 6%, transparent);
  overflow: hidden;
}

.stats-bar span {
  display: block;
  height: 100%;
  border-radius: inherit;
  background: linear-gradient(90deg, #ff6a00 0%, #ff8b33 100%);
}

.stats-summary-list {
  display: grid;
  gap: var(--sp-3);
}

.stats-summary-list div {
  display: grid;
  gap: 3px;
}

.stats-summary-list span {
  color: var(--text-soft);
  font-size: 0.8rem;
}

.stats-summary-list strong {
  color: var(--text-strong);
}

.stats-trouble-list {
  margin: 0;
  padding-left: 18px;
  display: grid;
  gap: 10px;
}

.stats-trouble-list li {
  display: grid;
  gap: 2px;
  color: var(--text-default);
}

.stats-trouble-list span {
  color: var(--text-muted);
  font-size: 0.84rem;
}

.main {
  min-width: 0;
}

.exercise-shell {
  display: grid;
  gap: var(--sp-6);
}

.onboarding-panel {
  display: grid;
  grid-template-columns: minmax(0, 1fr) minmax(320px, 0.95fr);
  gap: var(--sp-5);
  padding: var(--sp-6);
  background: linear-gradient(180deg, color-mix(in srgb, var(--primary) 8%, transparent), rgba(19, 18, 17, 0.94));
}

.onboarding-copy {
  display: grid;
  gap: var(--sp-3);
}

.onboarding-copy h2 {
  margin: 0;
  font-family: var(--font-display);
  font-size: clamp(2rem, 4vw, 3rem);
  line-height: 0.96;
  color: var(--text-strong);
}

.onboarding-copy p {
  margin: 0;
  color: var(--text-default);
}

.onboarding-steps {
  display: grid;
  gap: var(--sp-3);
}

.onboarding-steps div {
  display: grid;
  gap: 6px;
  padding: var(--sp-4);
  border-radius: var(--r-md);
  border: 1px solid var(--line-soft);
  background: color-mix(in srgb, var(--text-strong) 4%, transparent);
}

.onboarding-steps span {
  font-family: var(--font-mono);
  color: var(--primary);
  font-size: 0.76rem;
}

.onboarding-steps strong {
  color: var(--text-strong);
}

.onboarding-steps p {
  margin: 0;
  color: var(--text-muted);
  font-size: 0.9rem;
}

/* ── Achievements ─────────────────────────────────────────── */
.achievements-progress {
  display: grid;
  gap: var(--sp-3);
  padding: var(--sp-4);
  border: 1px solid var(--line);
  border-radius: var(--r-md);
  background: color-mix(in srgb, var(--text-strong) 4%, transparent);
}

.achievements-progress-bar {
  height: 12px;
  border-radius: 999px;
  background: color-mix(in srgb, var(--text-strong) 8%, transparent);
  overflow: hidden;
}

.achievements-progress-bar span {
  display: block;
  height: 100%;
  border-radius: inherit;
  background: linear-gradient(90deg, #ff6a00 0%, #ff8b33 100%);
  transition: width var(--slow) var(--ease);
}

.achievements-progress p {
  margin: 0;
  color: var(--text-muted);
  font-size: 0.9rem;
}

.achievements-section h3 {
  margin: 0 0 var(--sp-3) 0;
  font-family: var(--font-display);
  font-size: 1.2rem;
  color: var(--text-strong);
}

.achievements-grid {
  display: grid;
  gap: var(--sp-3);
}

.achievement-card {
  display: flex;
  gap: var(--sp-3);
  padding: var(--sp-4);
  border: 1px solid var(--line);
  border-radius: var(--r-md);
  background: color-mix(in srgb, var(--text-strong) 4%, transparent);
}

.achievement-unlocked {
  border-color: color-mix(in srgb, var(--primary) 30%, transparent);
  background: linear-gradient(180deg, color-mix(in srgb, var(--primary) 8%, transparent), rgba(19, 18, 17, 0.92));
}

.achievement-locked {
  opacity: 0.6;
}

.achievement-icon {
  width: 48px;
  height: 48px;
  display: flex;
  align-items: center;
  justify-content: center;
  border-radius: var(--r-md);
  background: color-mix(in srgb, var(--text-strong) 8%, transparent);
  font-size: 1.5rem;
}

.achievement-unlocked .achievement-icon {
  background: color-mix(in srgb, var(--primary) 15%, transparent);
}

.achievement-content h4 {
  margin: 0 0 4px 0;
  font-family: var(--font-display);
  font-size: 1rem;
  color: var(--text-strong);
}

.achievement-content p {
  margin: 0;
  color: var(--text-muted);
  font-size: 0.86rem;
}

/* ── Data Panel ─────────────────────────────────────────── */
.data-section {
  display: grid;
  gap: var(--sp-3);
  padding: var(--sp-4);
  border: 1px solid var(--line);
  border-radius: var(--r-md);
  background: color-mix(in srgb, var(--text-strong) 4%, transparent);
}

.data-section h3 {
  margin: 0;
  font-family: var(--font-display);
  font-size: 1.2rem;
  color: var(--text-strong);
}

.data-section p {
  margin: 0;
  color: var(--text-muted);
  font-size: 0.9rem;
}

.data-section .btn {
  justify-self: start;
}
  color: var(--primary);
  font-size: 0.76rem;
}

.onboarding-steps strong {
  color: var(--text-strong);
}

.onboarding-steps p {
  margin: 0;
  color: var(--text-muted);
  font-size: 0.9rem;
}

.hero-panel {
  display: grid;
  grid-template-columns: minmax(0, 1.55fr) minmax(320px, 0.95fr);
  gap: var(--sp-5);
  padding: var(--sp-6);
  border: 1px solid var(--line);
  border-radius: var(--r-xl);
  background:
    radial-gradient(circle at top right, rgba(255, 106, 0, 0.12), transparent 32%),
    linear-gradient(135deg, rgba(23, 21, 20, 0.96), rgba(13, 12, 12, 0.94));
  box-shadow: var(--shadow-soft);
}

.hero-copy {
  display: grid;
  gap: var(--sp-4);
}

.ex-header-overline {
  font-size: 0.76rem;
  font-weight: 600;
}

.ex-header-title {
  font-family: var(--font-display);
  font-size: clamp(2.3rem, 4.8vw, 4rem);
  line-height: 0.92;
  letter-spacing: -0.06em;
  color: var(--text-strong);
  max-width: 12ch;
}

.hero-summary {
  max-width: 58ch;
  font-size: 1.03rem;
  color: var(--text-default);
}

.ex-header-meta {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
}

.badge {
  padding: 7px 12px;
  font-size: 0.74rem;
}

.badge-topic {
  background: color-mix(in srgb, var(--text-strong) 4%, transparent);
  border-color: var(--line);
  color: var(--text-muted);
}

.lvl-0 { background: rgba(115, 215, 160, 0.12); color: var(--clr-lvl0); border-color: rgba(115, 215, 160, 0.2); }
.lvl-1 { background: rgba(217, 183, 102, 0.12); color: var(--clr-lvl1); border-color: rgba(217, 183, 102, 0.2); }
.lvl-2 { background: rgba(209, 161, 88, 0.12); color: var(--clr-lvl2); border-color: rgba(209, 161, 88, 0.2); }
.lvl-3 { background: rgba(197, 140, 73, 0.12); color: var(--clr-lvl3); border-color: rgba(197, 140, 73, 0.2); }
.lvl-4 { background: rgba(198, 116, 53, 0.12); color: var(--clr-lvl4); border-color: rgba(198, 116, 53, 0.2); }
.lvl-5 { background: rgba(208, 139, 99, 0.12); color: var(--clr-lvl5); border-color: rgba(208, 139, 99, 0.2); }
.lvl-6 { background: rgba(215, 156, 116, 0.12); color: var(--clr-lvl6); border-color: rgba(215, 156, 116, 0.2); }
.lvl-7 { background: rgba(201, 110, 61, 0.12); color: var(--clr-lvl7); border-color: rgba(201, 110, 61, 0.2); }
.lvl-8 { background: rgba(255, 106, 0, 0.12); color: var(--clr-lvl8); border-color: rgba(255, 106, 0, 0.22); }

.hero-stats {
  display: grid;
  gap: var(--sp-3);
}

.hero-stat-card,
.task-box,
.card,
.editor-stage,
.output-panel,
.check-result,
.inspector-card,
.done-banner {
  border: 1px solid var(--line);
  border-radius: var(--r-lg);
  background: rgba(19, 18, 17, 0.9);
  box-shadow: var(--shadow-card);
}

.hero-stat-card {
  display: grid;
  gap: 6px;
  padding: var(--sp-4);
}

.hero-stat-card strong {
  font-family: var(--font-display);
  font-size: 1.12rem;
  color: var(--text-strong);
  letter-spacing: -0.03em;
}

.hero-stat-card span:last-child {
  color: var(--text-muted);
  font-size: 0.88rem;
}

.hero-stat-label {
  font-size: 0.7rem;
  color: var(--text-soft);
}

.done-banner {
  padding: var(--sp-4) var(--sp-5);
  color: var(--success);
  background: linear-gradient(180deg, rgba(115, 215, 160, 0.12), rgba(19, 18, 17, 0.92));
}

.content-grid {
  display: grid;
  grid-template-columns: minmax(0, 1.45fr) minmax(280px, 0.72fr);
  gap: var(--sp-5);
}

.content-main,
.content-side {
  display: grid;
  gap: var(--sp-5);
  align-self: start;
}

.content-side {
  position: sticky;
  top: calc(var(--header-h) + var(--sp-6));
}

.card {
  overflow: hidden;
}

.card-header {
  width: 100%;
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: var(--sp-4) var(--sp-5);
  border: none;
  background: transparent;
  cursor: pointer;
  text-align: left;
}

.card-header:hover {
  background: color-mix(in srgb, var(--text-strong) 4%, transparent);
}

.card-header-left {
  display: inline-flex;
  gap: var(--sp-3);
  align-items: center;
  color: var(--text-muted);
  font-size: 0.76rem;
}

.card-toggle {
  color: var(--text-soft);
  transition: transform var(--normal) var(--ease);
}

.card-toggle.open {
  transform: rotate(180deg);
}

.card-body {
  padding: 0 var(--sp-5) var(--sp-5);
  font-size: 0.97rem;
  color: var(--text-default);
  overflow: hidden;
  transition: max-height var(--slow) var(--ease), padding var(--slow) var(--ease);
}

.card-body.collapsed {
  max-height: 0 !important;
  padding-top: 0;
  padding-bottom: 0;
}

.task-box {
  padding: var(--sp-5);
  background: linear-gradient(180deg, color-mix(in srgb, var(--primary) 10%, transparent), rgba(19, 18, 17, 0.92));
}

.task-box-label {
  margin-bottom: var(--sp-3);
  font-size: 0.72rem;
  color: var(--primary);
}

.task-box ul,
.task-box ol {
  padding-left: 20px;
  margin-top: var(--sp-2);
}

.task-box li + li {
  margin-top: 6px;
}

.editor-stage {
  display: grid;
  gap: var(--sp-4);
  padding: var(--sp-5);
}

.editor-brief {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: var(--sp-3);
}

.editor-brief-card {
  display: grid;
  gap: 6px;
  padding: var(--sp-4);
  border-radius: var(--r-md);
  border: 1px solid var(--line-soft);
  background: color-mix(in srgb, var(--text-strong) 4%, transparent);
}

.editor-brief-card strong {
  color: var(--text-strong);
  font-size: 0.95rem;
}

.editor-brief-label {
  font-size: 0.68rem;
  color: var(--text-soft);
}

.editor-wrap {
  border: 1px solid var(--line);
  border-radius: var(--r-lg);
  overflow: hidden;
  background: var(--surface-dark);
}

.editor-wrap-relative {
  position: relative;
}

.editor-wrap:focus-within {
  box-shadow: 0 0 0 4px rgba(255, 106, 0, 0.14);
}

.editor-toolbar {
  display: flex;
  justify-content: space-between;
  align-items: center;
  gap: var(--sp-3);
  padding: 14px 16px;
  background: rgba(17, 16, 15, 0.9);
  border-bottom: 1px solid var(--line-soft);
}

.editor-lang {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  color: rgba(237, 243, 247, 0.75);
  font-size: 0.76rem;
}

.editor-lang-dot {
  width: 10px;
  height: 10px;
  border-radius: 50%;
  background: var(--primary);
}

.editor-toolbar-right {
  display: inline-flex;
  align-items: center;
  gap: 10px;
}

.editor-shortcut-hint {
  font-family: var(--font-mono);
  font-size: 0.72rem;
  color: var(--text-soft);
}

.editor-btn-reset {
  padding: 8px 12px;
  border-radius: 999px;
  border: 1px solid var(--line);
  background: transparent;
  color: var(--text-default);
  cursor: pointer;
}

.editor-btn-reset:hover {
  background: color-mix(in srgb, var(--text-strong) 5%, transparent);
  color: var(--text-strong);
}

#ace-editor {
  width: 100%;
  min-height: 360px;
  font-size: 14px !important;
  line-height: 1.7 !important;
}

.ace-monokai {
  background-color: #11100f !important;
}

.ace-monokai .ace_gutter {
  background: #151312 !important;
  border-right: 1px solid color-mix(in srgb, var(--text-strong) 8%, transparent) !important;
}

.ace-monokai .ace_gutter-cell {
  color: rgba(246, 242, 235, 0.28) !important;
}

.ace-monokai .ace_cursor {
  border-left-color: #ff6a00 !important;
}

.ace-monokai .ace_active-line,
.ace-monokai .ace_gutter-active-line {
  background: rgba(255, 106, 0, 0.06) !important;
}

.ace-monokai .ace_selection {
  background: rgba(255, 106, 0, 0.14) !important;
}

.actions {
  display: flex;
  flex-wrap: wrap;
  gap: var(--sp-3);
}

.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  min-height: 48px;
  padding: 0 18px;
  border-radius: 999px;
  border: 1px solid transparent;
  cursor: pointer;
  font-weight: 600;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  transition:
    transform var(--fast) var(--ease),
    border-color var(--fast) var(--ease),
    background var(--fast) var(--ease),
    color var(--fast) var(--ease);
}

.btn:hover:not(:disabled) {
  transform: translateY(-1px);
}

.btn:disabled {
  opacity: 0.5;
  cursor: not-allowed;
}

.btn-run {
  background: color-mix(in srgb, var(--text-strong) 4%, transparent);
  border-color: var(--line);
  color: var(--text-strong);
}

.btn-check {
  background: var(--primary);
  border-color: color-mix(in srgb, var(--primary) 80%, black 20%);
  color: #2a1100;
}

.btn-hint {
  background: var(--secondary-soft);
  border-color: color-mix(in srgb, var(--secondary) 24%, transparent);
  color: var(--secondary);
}

.btn-ghost {
  background: color-mix(in srgb, var(--text-strong) 3%, transparent);
  border-color: var(--line);
  color: var(--text-default);
}

.spinner {
  width: 14px;
  height: 14px;
  border: 2px solid rgba(255, 255, 255, 0.18);
  border-top-color: currentColor;
  border-radius: 50%;
  animation: spin 0.75s linear infinite;
}

@keyframes spin {
  to {
    transform: rotate(360deg);
  }
}

.output-panel,
.check-result,
.inspector-card,
.hint-item {
  animation: slide-up var(--normal) var(--ease);
}

@keyframes slide-up {
  from {
    opacity: 0;
    transform: translateY(8px);
  }
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

.output-header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  gap: var(--sp-3);
  padding: var(--sp-4) var(--sp-5);
  border-bottom: 1px solid var(--line-soft);
}

.output-title {
  font-size: 0.72rem;
  color: var(--text-muted);
}

.output-meta {
  font-size: 0.74rem;
  color: var(--text-soft);
}

.output-body {
  min-height: 72px;
  max-height: 320px;
  overflow-y: auto;
  padding: var(--sp-5);
  font-family: var(--font-mono);
  font-size: 0.87rem;
  white-space: pre-wrap;
  word-break: break-word;
  color: var(--success);
}

.output-body.has-error {
  color: var(--danger);
}

.output-prompt {
  margin-bottom: var(--sp-3);
  color: var(--text-soft);
  font-size: 0.76rem;
}

.output-empty {
  color: var(--text-soft);
  font-style: italic;
}

.check-result {
  padding: var(--sp-5);
}

.check-result.success {
  background: linear-gradient(180deg, rgba(115, 215, 160, 0.1), rgba(19, 18, 17, 0.92));
  color: var(--success);
}

.check-result.error {
  background: linear-gradient(180deg, rgba(240, 141, 134, 0.1), rgba(19, 18, 17, 0.92));
  color: var(--danger);
}

.check-result-title {
  margin-bottom: var(--sp-2);
  font-family: var(--font-display);
  font-size: 1.1rem;
  letter-spacing: -0.03em;
}

.result-meta,
.result-summary {
  margin-top: var(--sp-3);
  font-size: 0.92rem;
  color: var(--text-default);
}

.result-actions {
  display: flex;
  flex-wrap: wrap;
  gap: var(--sp-3);
  margin-top: var(--sp-4);
}

.check-expected {
  margin-top: var(--sp-3);
  padding: var(--sp-4);
  border-radius: var(--r-md);
  border: 1px solid var(--line-soft);
  background: rgba(255, 255, 255, 0.03);
  font-size: 0.78rem;
  color: var(--text-default);
  white-space: pre-wrap;
}

.check-expected-label {
  display: block;
  margin-bottom: var(--sp-2);
  font-size: 0.68rem;
  color: var(--text-soft);
}

.hints-wrap {
  display: grid;
  gap: var(--sp-3);
}

.hints-list {
  display: grid;
  gap: var(--sp-3);
}

.hint-item {
  padding: var(--sp-4) var(--sp-5);
  border: 1px solid color-mix(in srgb, var(--secondary) 24%, transparent);
  border-radius: var(--r-md);
  background: linear-gradient(180deg, rgba(243, 179, 93, 0.1), rgba(19, 18, 17, 0.92));
  color: var(--secondary);
}

.hint-counter {
  color: var(--text-muted);
  font-size: 0.86rem;
}

.nav-buttons {
  display: flex;
  justify-content: space-between;
  align-items: center;
  gap: var(--sp-3);
  padding-top: var(--sp-3);
}

.nav-pos {
  font-size: 0.82rem;
  color: var(--text-soft);
}

.inspector-card {
  padding: var(--sp-5);
  display: grid;
  gap: var(--sp-4);
}

.inspector-heading {
  font-size: 0.72rem;
  color: var(--text-soft);
}

.inspector-list {
  display: grid;
  gap: var(--sp-3);
}

.inspector-list div {
  display: grid;
  gap: 2px;
}

.inspector-list span {
  font-size: 0.82rem;
  color: var(--text-muted);
}

.inspector-list strong {
  color: var(--text-strong);
  font-size: 0.95rem;
}

.inspector-copy {
  font-size: 0.94rem;
  color: var(--text-default);
}

.resource-links {
  display: grid;
  gap: 10px;
}

.resource-link {
  display: inline-flex;
  align-items: center;
  justify-content: space-between;
  gap: 12px;
  padding: 12px 14px;
  border: 1px solid var(--line-soft);
  border-radius: var(--r-md);
  background: color-mix(in srgb, var(--text-strong) 4%, transparent);
  color: var(--text-default);
  text-decoration: none;
  transition:
    border-color var(--fast) var(--ease),
    background var(--fast) var(--ease),
    color var(--fast) var(--ease),
    transform var(--fast) var(--ease);
}

.resource-link::after {
  content: '↗';
  color: var(--primary);
  font-family: var(--font-mono);
  font-size: 0.82rem;
}

.resource-link:hover {
  transform: translateY(-1px);
  border-color: color-mix(in srgb, var(--primary) 30%, transparent);
  background: color-mix(in srgb, var(--primary) 7%, transparent);
  color: var(--text-strong);
}

.inspector-output {
  padding: var(--sp-4);
  border-radius: var(--r-md);
  background: var(--surface-muted);
  border: 1px solid var(--line-soft);
  font-family: var(--font-mono);
  font-size: 0.8rem;
  white-space: pre-wrap;
  color: var(--text-default);
}

.card-body pre,
.task-box code,
.card-body code,
.hint-item code,
.file-warning code {
  font-family: var(--font-mono);
}

.card-body pre {
  margin: var(--sp-3) 0;
  padding: var(--sp-4);
  border-radius: var(--r-md);
  background: #121110;
  color: var(--text-on-dark);
  overflow-x: auto;
  line-height: 1.6;
}

.card-body code,
.task-box code,
.hint-item code {
  padding: 2px 6px;
  border-radius: 6px;
  background: rgba(255, 106, 0, 0.1);
  color: var(--primary-strong);
  font-size: 0.86em;
}

.info-table {
  width: 100%;
  border-collapse: collapse;
  margin: var(--sp-3) 0;
  font-size: 0.92rem;
}

.info-table th,
.info-table td {
  padding: 10px 12px;
  border: 1px solid var(--line-soft);
  text-align: left;
}

.info-table th {
  background: rgba(255, 255, 255, 0.04);
  color: var(--text-strong);
}

.run-overlay {
  position: absolute;
  inset: 0;
  display: flex;
  align-items: center;
  justify-content: center;
  gap: var(--sp-3);
  border-radius: inherit;
  background: rgba(16, 23, 31, 0.72);
  color: var(--primary);
  backdrop-filter: blur(4px);
  z-index: 20;
}

.confetti-piece {
  position: fixed;
  pointer-events: none;
  z-index: 9999;
  animation: confetti-fall linear forwards;
}

@keyframes confetti-fall {
  0% {
    transform: translateY(-20px) rotate(0deg);
    opacity: 1;
  }
  100% {
    transform: translateY(100vh) rotate(720deg);
    opacity: 0;
  }
}

.sidebar-backdrop {
  display: none;
}

@media (prefers-reduced-motion: reduce) {
  *,
  *::before,
  *::after {
    animation-duration: 0.01ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: 0.01ms !important;
    scroll-behavior: auto !important;
  }
}

@media (max-width: 1280px) {
  .app-layout {
    grid-template-columns: minmax(280px, 320px) minmax(0, 1fr);
  }

  .content-grid,
  .hero-panel,
  .onboarding-panel,
  .stats-detail-grid {
    grid-template-columns: 1fr;
  }

  .content-side {
    position: static;
  }
}

@media (max-width: 980px) {
  .header {
    padding: 0 var(--sp-4);
  }

  .header-stage {
    display: none;
  }

  .stats-panel {
    inset: auto var(--sp-4) var(--sp-4) var(--sp-4);
    width: auto;
    max-height: calc(100vh - 2rem);
  }

  .stats-grid {
    grid-template-columns: 1fr;
  }

  .app-layout {
    grid-template-columns: 1fr;
    padding: var(--sp-4);
  }

  .sidebar-toggle {
    display: inline-flex;
  }

  .sidebar {
    position: fixed;
    top: var(--header-h);
    left: var(--sp-4);
    bottom: var(--sp-4);
    width: min(88vw, 360px);
    max-height: none;
    z-index: 140;
    transform: translateX(calc(-100% - var(--sp-4)));
    transition: transform var(--normal) var(--ease);
  }

  .sidebar.open {
    transform: translateX(0);
  }

  .sidebar-close {
    display: inline-flex;
  }

  .sidebar-backdrop {
    position: fixed;
    inset: 0;
    top: var(--header-h);
    background: rgba(0, 0, 0, 0.46);
    backdrop-filter: blur(4px);
    z-index: 130;
  }

  .sidebar-backdrop.show {
    display: block;
  }

  .main {
    min-width: 0;
  }
}

@media (max-width: 720px) {
  .header {
    gap: var(--sp-3);
  }

  .header-tag {
    display: none;
  }

  .header-brand-subtitle {
    display: none;
  }

  .header-brand-credit {
    display: none;
  }

  .header-progress-bar {
    width: 100px;
  }

  .sidebar-scroll,
  .hero-panel,
  .task-box,
  .editor-stage,
  .inspector-card,
  .check-result,
  .output-header,
  .output-body,
  .card-header,
  .card-body {
    padding-left: var(--sp-4);
    padding-right: var(--sp-4);
  }

  .editor-brief,
  .sidebar-metrics {
    grid-template-columns: 1fr;
  }

  .sidebar-action-row,
  .result-actions,
  .sidebar-filters {
    flex-direction: column;
  }

  .editor-toolbar-right {
    width: 100%;
    justify-content: space-between;
  }

  .editor-shortcut-hint {
    font-size: 0.68rem;
  }

  .ex-header-title {
    font-size: 2.25rem;
  }

  .actions {
    position: sticky;
    bottom: 0;
    z-index: 50;
    margin: 0 calc(var(--sp-4) * -1);
    padding: var(--sp-3) var(--sp-4) 0;
    background: linear-gradient(180deg, rgba(6, 9, 15, 0), rgba(6, 9, 15, 0.96) 34%);
  }
}

@media (max-width: 560px) {
  .header {
    height: auto;
    min-height: var(--header-h);
    flex-wrap: wrap;
    padding-top: var(--sp-3);
    padding-bottom: var(--sp-3);
  }

  .header-status {
    width: 100%;
    justify-content: space-between;
  }

  .header-progress {
    min-width: 0;
    flex: 1;
  }

  .file-warning {
    padding: var(--sp-3) var(--sp-4);
    align-items: flex-start;
  }

  .app-layout {
    padding: var(--sp-3);
  }

  .hero-panel,
  .editor-stage,
  .task-box,
  .done-banner,
  .inspector-card {
    border-radius: 20px;
  }

  .actions,
  .nav-buttons {
    flex-direction: column;
    align-items: stretch;
  }

  .nav-pos {
    order: -1;
    text-align: center;
  }
}

/* ============================================================
   AUTH UI — Login Modal, Header Auth Button, User Menu
   ============================================================ */

/* ============================================================
   ACHIEVEMENT TOAST
   ============================================================ */

.achievement-toast {
  position: fixed;
  top: 16px;
  right: -320px;
  width: 280px;
  display: flex;
  align-items: center;
  gap: var(--sp-3);
  padding: var(--sp-3) var(--sp-4);
  background: var(--surface-elevated);
  border: 1px solid var(--border);
  border-radius: var(--radius-lg);
  box-shadow: var(--shadow-floating);
  z-index: 9999;
  transition: right 0.4s var(--ease);
}

.achievement-toast.show { right: 16px; }

.achievement-toast.tier-silver { border-color: rgba(192,192,192,0.4); }
.achievement-toast.tier-gold { border-color: rgba(255,215,0,0.4); }
.achievement-toast.tier-legendary { border-color: var(--primary); box-shadow: 0 0 20px rgba(255,106,0,0.15); }

.toast-icon { font-size: 1.5rem; flex-shrink: 0; }

.toast-content {
  display: flex;
  flex-direction: column;
  gap: 1px;
}

.toast-content strong {
  font-size: 0.8rem;
  color: var(--text-strong);
}

.toast-content span {
  font-size: 0.7rem;
  color: var(--text-muted);
}

.mute-btn {
  background: none;
  border: none;
  font-size: 1rem;
  cursor: pointer;
  padding: 4px;
  opacity: 0.6;
  transition: opacity var(--duration-fast) var(--ease);
}

.mute-btn:hover { opacity: 1; }

.header-auth {
  display: flex;
  align-items: center;
  gap: var(--sp-2);
  margin-left: var(--sp-3);
  position: relative;
}

.auth-avatar {
  width: 28px;
  height: 28px;
  border-radius: 50%;
  border: 2px solid var(--primary);
  object-fit: cover;
}

.auth-btn {
  background: var(--surface-elevated);
  color: var(--text-default);
  border: 1px solid var(--border);
  padding: var(--sp-1) var(--sp-3);
  border-radius: var(--radius-md);
  font-family: var(--font-body);
  font-size: 0.8rem;
  font-weight: 500;
  cursor: pointer;
  transition: all var(--duration-fast) var(--ease);
  white-space: nowrap;
}

.auth-btn:hover {
  background: var(--primary);
  color: var(--bg);
  border-color: var(--primary);
}

.user-menu {
  display: none;
  position: absolute;
  top: 100%;
  right: 0;
  margin-top: var(--sp-2);
  background: var(--surface-elevated);
  border: 1px solid var(--border);
  border-radius: var(--radius-md);
  padding: var(--sp-2);
  min-width: 140px;
  box-shadow: var(--shadow-floating);
  z-index: 200;
}

.user-menu.open { display: block; }

.user-menu-item {
  display: block;
  width: 100%;
  text-align: left;
  background: none;
  border: none;
  color: var(--text-default);
  font-family: var(--font-body);
  font-size: 0.8rem;
  padding: var(--sp-2) var(--sp-3);
  border-radius: var(--radius-sm);
  cursor: pointer;
  transition: background var(--duration-fast) var(--ease);
}

.user-menu-item:hover {
  background: var(--surface-glass);
}

/* ── Login Modal ─────────────────────────────────────────── */

.login-modal {
  position: fixed;
  top: 50%;
  left: 50%;
  transform: translate(-50%, -50%) scale(0.95);
  width: min(420px, 90vw);
  max-height: 90vh;
  overflow-y: auto;
  background: var(--surface-elevated);
  border: 1px solid var(--border);
  border-radius: var(--radius-xl);
  padding: var(--sp-6) var(--sp-7);
  box-shadow: var(--shadow-floating);
  z-index: 1100;
  opacity: 0;
  visibility: hidden;
  transition: all var(--duration-normal) var(--ease);
}

.login-modal.open {
  opacity: 1;
  visibility: visible;
  transform: translate(-50%, -50%) scale(1);
}

.login-modal-head {
  display: flex;
  justify-content: space-between;
  align-items: flex-start;
  margin-bottom: var(--sp-5);
}

.login-modal-body {
  display: flex;
  flex-direction: column;
  gap: var(--sp-4);
}

.login-info {
  font-size: 0.85rem;
  color: var(--text-muted);
  line-height: 1.5;
}

.btn-github {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: var(--sp-2);
  width: 100%;
  padding: var(--sp-3) var(--sp-4);
  background: #24292f;
  color: #fff;
  border: 1px solid rgba(255,255,255,0.1);
  border-radius: var(--radius-md);
  font-family: var(--font-body);
  font-size: 0.9rem;
  font-weight: 600;
  cursor: pointer;
  transition: all var(--duration-fast) var(--ease);
}

.btn-github:hover {
  background: #3a3f46;
  border-color: var(--primary);
  box-shadow: 0 0 12px rgba(255,106,0,0.15);
}

.btn-github svg {
  flex-shrink: 0;
}

.login-divider {
  display: flex;
  align-items: center;
  gap: var(--sp-3);
  color: var(--text-soft);
  font-size: 0.75rem;
}

.login-divider::before,
.login-divider::after {
  content: '';
  flex: 1;
  height: 1px;
  background: var(--border);
}

.login-label {
  font-size: 0.8rem;
  font-weight: 500;
  color: var(--text-muted);
}

.login-input {
  width: 100%;
  padding: var(--sp-3);
  background: var(--bg);
  border: 1px solid var(--border);
  border-radius: var(--radius-md);
  color: var(--text-default);
  font-family: var(--font-body);
  font-size: 0.9rem;
  margin-top: var(--sp-1);
  transition: border-color var(--duration-fast) var(--ease);
}

.login-input:focus {
  outline: none;
  border-color: var(--primary);
  box-shadow: 0 0 0 2px rgba(255,106,0,0.15);
}

.login-input::placeholder {
  color: var(--text-soft);
}

.login-status {
  font-size: 0.8rem;
  color: var(--primary);
  min-height: 1.2em;
}

.login-guest-note {
  font-size: 0.75rem;
  color: var(--text-soft);
  text-align: center;
  line-height: 1.4;
}

/* ============================================================
   GAMIFICATION UI — XP Bar, Level Badge, Coins, Streak
   ============================================================ */

.header-gamification {
  display: flex;
  align-items: center;
  gap: var(--sp-2);
  margin-left: var(--sp-2);
  flex-shrink: 0;
}

.gam-streak {
  display: inline-flex;
  align-items: center;
  gap: 2px;
  font-size: 0.75rem;
  font-weight: 600;
  color: #f97316;
  background: rgba(249,115,22,0.12);
  border: 1px solid rgba(249,115,22,0.2);
  padding: 2px 8px;
  border-radius: var(--radius-sm);
}

.gam-streak::before {
  content: '🔥';
  font-size: 0.7rem;
}

.gam-coins {
  font-size: 0.75rem;
  font-weight: 600;
  font-family: var(--font-mono);
  color: var(--primary);
  background: rgba(255,106,0,0.08);
  border: 1px solid rgba(255,106,0,0.15);
  padding: 2px 8px;
  border-radius: var(--radius-sm);
}

.gam-level-block {
  display: flex;
  flex-direction: column;
  gap: 2px;
  min-width: 120px;
}

.gam-level-row {
  display: flex;
  align-items: center;
  gap: var(--sp-2);
}

.gam-level-badge {
  font-size: 0.65rem;
  font-weight: 700;
  font-family: var(--font-mono);
  color: var(--bg);
  background: var(--primary);
  padding: 1px 6px;
  border-radius: var(--radius-sm);
  text-transform: uppercase;
  letter-spacing: 0.05em;
}

.gam-level-title {
  font-size: 0.7rem;
  font-weight: 500;
  color: var(--text-muted);
  white-space: nowrap;
}

.gam-xp-bar {
  height: 4px;
  background: var(--surface-glass);
  border-radius: 2px;
  overflow: hidden;
}

.gam-xp-fill {
  height: 100%;
  background: linear-gradient(90deg, var(--primary), #ff8b33);
  border-radius: 2px;
  transition: width 0.6s var(--ease);
}

.gam-xp-text {
  font-size: 0.6rem;
  color: var(--text-soft);
  font-family: var(--font-mono);
}

/* ── Floating XP Animation ─────────────────────────────────── */

.xp-floater {
  position: fixed;
  top: 50%;
  left: 50%;
  transform: translate(-50%, -50%);
  font-size: 1.8rem;
  font-weight: 700;
  font-family: var(--font-mono);
  color: var(--primary);
  text-shadow: 0 0 20px rgba(255,106,0,0.5), 0 2px 8px rgba(0,0,0,0.5);
  z-index: 9999;
  pointer-events: none;
  animation: xpFloat 1.8s var(--ease) forwards;
}

.coin-floater {
  font-size: 1.2rem;
  color: #fbbf24;
  margin-left: 8px;
}

@keyframes xpFloat {
  0% {
    opacity: 0;
    transform: translate(-50%, -30%) scale(0.5);
  }
  20% {
    opacity: 1;
    transform: translate(-50%, -50%) scale(1.1);
  }
  40% {
    transform: translate(-50%, -50%) scale(1);
  }
  80% {
    opacity: 1;
  }
  100% {
    opacity: 0;
    transform: translate(-50%, -120%) scale(0.8);
  }
}

.xp-bonus-toast {
  position: fixed;
  top: calc(50% + 40px);
  left: 50%;
  transform: translateX(-50%);
  display: flex;
  gap: var(--sp-2);
  z-index: 9998;
  pointer-events: none;
  animation: bonusToast 2s var(--ease) forwards;
}

.xp-bonus-toast span {
  font-size: 0.75rem;
  font-weight: 600;
  font-family: var(--font-mono);
  color: var(--success);
  background: rgba(52,211,153,0.1);
  border: 1px solid rgba(52,211,153,0.2);
  padding: 2px 8px;
  border-radius: var(--radius-sm);
}

@keyframes bonusToast {
  0% { opacity: 0; transform: translateX(-50%) translateY(10px); }
  15% { opacity: 1; transform: translateX(-50%) translateY(0); }
  75% { opacity: 1; }
  100% { opacity: 0; transform: translateX(-50%) translateY(-20px); }
}

/* ── Level-Up Overlay ────────────────────────────────────────── */

.levelup-overlay {
  position: fixed;
  inset: 0;
  background: rgba(0,0,0,0.85);
  display: flex;
  align-items: center;
  justify-content: center;
  z-index: 10000;
  cursor: pointer;
  animation: levelupIn 0.5s var(--ease) forwards;
}

.levelup-overlay.fadeout {
  animation: levelupOut 0.4s var(--ease) forwards;
}

.levelup-content {
  text-align: center;
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: var(--sp-3);
}

.levelup-glitch {
  font-size: 3rem;
  font-weight: 900;
  font-family: var(--font-mono);
  color: var(--primary);
  text-shadow: 0 0 30px rgba(255,106,0,0.6);
  animation: glitch 0.3s ease-in-out 3;
  position: relative;
}

.levelup-glitch::before,
.levelup-glitch::after {
  content: attr(data-text);
  position: absolute;
  left: 0;
  width: 100%;
  overflow: hidden;
}

.levelup-glitch::before {
  color: #0ff;
  top: -2px;
  left: 2px;
  animation: glitchClip 0.4s ease-in-out 3 alternate;
  clip-path: inset(0 0 60% 0);
}

.levelup-glitch::after {
  color: #f0f;
  top: 2px;
  left: -2px;
  animation: glitchClip2 0.4s ease-in-out 3 alternate;
  clip-path: inset(60% 0 0 0);
}

.levelup-level {
  font-size: 1.5rem;
  font-weight: 700;
  color: var(--text-strong);
  font-family: var(--font-mono);
}

.levelup-title {
  font-size: 2rem;
  font-weight: 700;
  color: var(--primary);
  text-shadow: 0 0 20px rgba(255,106,0,0.4);
}

.levelup-subtitle {
  font-size: 0.75rem;
  font-family: var(--font-mono);
  color: var(--text-muted);
  letter-spacing: 0.3em;
  text-transform: uppercase;
}

@keyframes levelupIn {
  0% { opacity: 0; }
  100% { opacity: 1; }
}

@keyframes levelupOut {
  0% { opacity: 1; }
  100% { opacity: 0; }
}

@keyframes glitch {
  0% { transform: translate(0); }
  25% { transform: translate(-3px, 2px); }
  50% { transform: translate(3px, -1px); }
  75% { transform: translate(-2px, -2px); }
  100% { transform: translate(0); }
}

@keyframes glitchClip {
  0% { clip-path: inset(0 0 80% 0); }
  100% { clip-path: inset(0 0 40% 0); }
}

@keyframes glitchClip2 {
  0% { clip-path: inset(80% 0 0 0); }
  100% { clip-path: inset(40% 0 0 0); }
}

/* ── XP line in check result ──────────────────────────────── */
.result-xp {
  font-size: 0.85rem;
  font-weight: 600;
  font-family: var(--font-mono);
  color: var(--primary);
  padding: var(--sp-2) 0;
}

/* ============================================================
   DIFFICULTY — Onboarding Overlay + Settings
   ============================================================ */

.difficulty-overlay {
  position: fixed;
  inset: 0;
  background: rgba(0,0,0,0.88);
  display: flex;
  align-items: center;
  justify-content: center;
  z-index: 10000;
  opacity: 0;
  transition: opacity 0.4s var(--ease);
}

.difficulty-overlay.open { opacity: 1; }

.difficulty-overlay.closing {
  animation: levelupOut 0.3s var(--ease) forwards;
}

.difficulty-modal {
  width: min(600px, 92vw);
  background: var(--surface-elevated);
  border: 1px solid var(--border);
  border-radius: var(--radius-xl);
  padding: var(--sp-7) var(--sp-8);
  text-align: center;
  transform: scale(0.95);
  transition: transform 0.4s var(--ease);
}

.difficulty-overlay.open .difficulty-modal {
  transform: scale(1);
}

.difficulty-header {
  margin-bottom: var(--sp-6);
}

.difficulty-title {
  font-size: 1.5rem;
  font-weight: 700;
  color: var(--text-strong);
  margin: var(--sp-2) 0;
}

.difficulty-subtitle {
  font-size: 0.85rem;
  color: var(--text-muted);
  line-height: 1.5;
}

.difficulty-options {
  display: flex;
  gap: var(--sp-4);
  justify-content: center;
}

.difficulty-card {
  flex: 1;
  max-width: 180px;
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: var(--sp-2);
  padding: var(--sp-5) var(--sp-4);
  background: var(--bg);
  border: 2px solid var(--border);
  border-radius: var(--radius-lg);
  cursor: pointer;
  transition: all var(--duration-fast) var(--ease);
  text-align: center;
}

.difficulty-card:hover {
  border-color: var(--primary);
  background: rgba(255,106,0,0.05);
  transform: translateY(-2px);
  box-shadow: 0 4px 20px rgba(255,106,0,0.12);
}

.difficulty-icon {
  font-size: 2rem;
}

.difficulty-label {
  font-size: 0.9rem;
  color: var(--text-strong);
}

.difficulty-desc {
  font-size: 0.7rem;
  color: var(--text-muted);
  line-height: 1.4;
  margin: 0;
}

/* ── Difficulty Setting in Sidebar ───────────────────────── */

.difficulty-setting {
  padding: var(--sp-3) 0;
  border-top: 1px solid var(--border);
  margin-top: var(--sp-3);
}

.difficulty-setting-label {
  font-size: 0.7rem;
  font-weight: 600;
  color: var(--text-muted);
  text-transform: uppercase;
  letter-spacing: 0.05em;
  display: block;
  margin-bottom: var(--sp-2);
}

.difficulty-setting-buttons {
  display: flex;
  gap: var(--sp-1);
}

.difficulty-setting-btn {
  flex: 1;
  padding: var(--sp-1) var(--sp-2);
  font-size: 0.65rem;
  font-family: var(--font-body);
  background: var(--surface-glass);
  border: 1px solid var(--border);
  border-radius: var(--radius-sm);
  color: var(--text-muted);
  cursor: pointer;
  transition: all var(--duration-fast) var(--ease);
  white-space: nowrap;
}

.difficulty-setting-btn:hover {
  border-color: var(--primary);
  color: var(--text-default);
}

.difficulty-setting-btn.active {
  background: rgba(255,106,0,0.12);
  border-color: var(--primary);
  color: var(--primary);
  font-weight: 600;
}

/* ── Beginner Explanation Block ──────────────────────────── */

.beginner-block {
  background: rgba(255,106,0,0.04);
  border: 1px solid rgba(255,106,0,0.1);
  border-radius: var(--radius-md);
  padding: var(--sp-4);
  margin-bottom: var(--sp-4);
}

.beginner-block-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  cursor: pointer;
  user-select: none;
}

.beginner-block-label {
  font-size: 0.8rem;
  font-weight: 600;
  color: var(--primary);
  display: flex;
  align-items: center;
  gap: var(--sp-2);
}

.beginner-block-toggle {
  font-size: 0.7rem;
  color: var(--text-soft);
  transition: transform var(--duration-fast) var(--ease);
}

.beginner-block-toggle.open {
  transform: rotate(180deg);
}

.beginner-block-body {
  margin-top: var(--sp-3);
  font-size: 0.85rem;
  line-height: 1.7;
  color: var(--text-default);
  overflow: hidden;
  transition: max-height var(--duration-normal) var(--ease);
}

.beginner-block-body.collapsed {
  max-height: 0;
  margin-top: 0;
}

.beginner-block-body p {
  margin-bottom: var(--sp-2);
}

.beginner-analogy {
  background: rgba(255,255,255,0.03);
  border-left: 3px solid var(--primary);
  padding: var(--sp-2) var(--sp-3);
  margin: var(--sp-2) 0;
  font-style: italic;
  color: var(--text-muted);
  font-size: 0.82rem;
}

/* ── Responsive ──────────────────────────────────────────── */

@media (max-width: 560px) {
  .difficulty-options {
    flex-direction: column;
    align-items: stretch;
  }
  .difficulty-card {
    max-width: none;
  }
}

/* ============================================================
   SKILL TREE — Panel + SVG Nodes
   ============================================================ */

.skilltree-panel {
  position: fixed;
  top: 0;
  right: -680px;
  width: min(680px, 95vw);
  height: 100vh;
  background: var(--bg);
  border-left: 1px solid var(--border);
  z-index: 1050;
  display: flex;
  flex-direction: column;
  transition: right var(--duration-normal) var(--ease);
  box-shadow: var(--shadow-floating);
}

.skilltree-panel.open {
  right: 0;
}

.skilltree-body {
  flex: 1;
  overflow-y: auto;
  padding: var(--sp-6);
}

.skilltree-body svg {
  width: 100%;
  min-height: 500px;
}

.tree-node:hover circle {
  filter: brightness(1.2);
}

.tree-node:hover text {
  fill: var(--text-strong) !important;
}

/* ============================================================
   BOSS BATTLE — Timer, Special UI
   ============================================================ */

.boss-banner {
  background: linear-gradient(135deg, rgba(248,113,113,0.08), rgba(255,106,0,0.08));
  border: 2px solid rgba(248,113,113,0.3);
  border-radius: var(--radius-lg);
  padding: var(--sp-4);
  text-align: center;
  margin-bottom: var(--sp-4);
  animation: bossPulse 2s ease-in-out infinite;
}

.boss-banner-title {
  font-size: 1.1rem;
  font-weight: 700;
  color: #f87171;
  font-family: var(--font-mono);
}

.boss-banner-subtitle {
  font-size: 0.8rem;
  color: var(--text-muted);
  margin-top: var(--sp-1);
}

.boss-timer {
  display: inline-flex;
  align-items: center;
  gap: var(--sp-2);
  font-size: 1.2rem;
  font-weight: 700;
  font-family: var(--font-mono);
  color: #f87171;
  background: rgba(248,113,113,0.08);
  border: 1px solid rgba(248,113,113,0.2);
  padding: var(--sp-2) var(--sp-4);
  border-radius: var(--radius-md);
  margin-top: var(--sp-3);
}

.boss-timer::before {
  content: '⏱';
}

.boss-timer.warning {
  color: #fbbf24;
  border-color: rgba(251,191,36,0.3);
  animation: timerPulse 1s ease-in-out infinite;
}

.boss-timer.critical {
  color: #f87171;
  animation: timerPulse 0.5s ease-in-out infinite;
}

@keyframes bossPulse {
  0%, 100% { border-color: rgba(248,113,113,0.3); }
  50% { border-color: rgba(248,113,113,0.6); box-shadow: 0 0 20px rgba(248,113,113,0.1); }
}

@keyframes timerPulse {
  0%, 100% { opacity: 1; }
  50% { opacity: 0.6; }
}

/* Boss mode: red glow on editor */
.editor-wrap.boss-mode {
  border: 2px solid rgba(248,113,113,0.4);
  box-shadow: 0 0 30px rgba(248,113,113,0.1);
}

.boss-locked {
  display: flex;
  align-items: center;
  gap: var(--sp-2);
  padding: var(--sp-3) var(--sp-4);
  background: rgba(255,255,255,0.02);
  border: 1px dashed var(--border);
  border-radius: var(--radius-md);
  color: var(--text-soft);
  font-size: 0.8rem;
  margin-top: var(--sp-2);
}

.boss-locked::before {
  content: '🔒';
  font-size: 1rem;
}

/* ============================================================
   SHOP — Cosmetics Grid
   ============================================================ */

.shop-panel-wide { max-width: 520px; }

.shop-balance {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: var(--sp-4);
  background: rgba(255,106,0,0.06);
  border: 1px solid rgba(255,106,0,0.12);
  border-radius: var(--radius-md);
  margin-bottom: var(--sp-5);
}

.shop-balance-label { font-size: 0.8rem; color: var(--text-muted); }
.shop-balance-value { font-size: 1.2rem; font-family: var(--font-mono); color: var(--primary); }

.shop-section { margin-bottom: var(--sp-5); }
.shop-section-title {
  font-size: 0.85rem;
  font-weight: 600;
  color: var(--text-strong);
  margin-bottom: var(--sp-3);
  padding-bottom: var(--sp-2);
  border-bottom: 1px solid var(--border);
}

.shop-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(140px, 1fr));
  gap: var(--sp-3);
}

.shop-item {
  display: flex;
  flex-direction: column;
  gap: var(--sp-2);
  padding: var(--sp-3);
  background: var(--surface-glass);
  border: 1px solid var(--border);
  border-radius: var(--radius-md);
  transition: all var(--duration-fast) var(--ease);
}

.shop-item.equipped { border-color: var(--primary); background: rgba(255,106,0,0.05); }
.shop-item:hover { border-color: rgba(255,255,255,0.15); }

.shop-item-preview {
  height: 32px;
  border-radius: var(--radius-sm);
  display: flex;
  align-items: center;
  justify-content: center;
  font-family: var(--font-mono);
  font-size: 0.7rem;
}

.shop-item-info strong {
  font-size: 0.75rem;
  color: var(--text-default);
}

.shop-item-action {
  display: flex;
  justify-content: flex-end;
}

.shop-buy-btn, .shop-equip-btn {
  padding: 2px 10px;
  font-size: 0.7rem;
  font-family: var(--font-mono);
  font-weight: 600;
  border-radius: var(--radius-sm);
  cursor: pointer;
  border: 1px solid;
  transition: all var(--duration-fast) var(--ease);
}

.shop-buy-btn {
  color: var(--primary);
  border-color: rgba(255,106,0,0.3);
  background: rgba(255,106,0,0.08);
}
.shop-buy-btn:hover:not(.disabled) { background: rgba(255,106,0,0.15); }
.shop-buy-btn.disabled { opacity: 0.4; cursor: not-allowed; }

.shop-equip-btn {
  color: var(--success);
  border-color: rgba(52,211,153,0.3);
  background: rgba(52,211,153,0.08);
}
.shop-equip-btn:hover { background: rgba(52,211,153,0.15); }

.shop-equipped {
  font-size: 0.65rem;
  font-weight: 600;
  color: var(--primary);
  text-transform: uppercase;
  letter-spacing: 0.05em;
}

.shop-free {
  font-size: 0.65rem;
  color: var(--text-soft);
}

/* ============================================================
   PROFILE — Player Card
   ============================================================ */

.profile-card {
  text-align: center;
  padding: var(--sp-5) var(--sp-4);
  background: var(--surface-glass);
  border: 1px solid var(--border);
  border-radius: var(--radius-lg);
  margin-bottom: var(--sp-5);
}

.profile-avatar-wrap {
  margin-bottom: var(--sp-3);
}

.profile-avatar {
  width: 64px;
  height: 64px;
  border-radius: 50%;
  border: 3px solid var(--primary);
  object-fit: cover;
}

.profile-avatar-placeholder {
  width: 64px;
  height: 64px;
  border-radius: 50%;
  border: 3px solid var(--border);
  display: inline-flex;
  align-items: center;
  justify-content: center;
  font-size: 1.8rem;
  background: var(--surface-elevated);
}

.profile-name {
  font-size: 1.2rem;
  font-weight: 700;
  color: var(--text-strong);
}

.profile-title {
  font-size: 0.8rem;
  font-family: var(--font-mono);
  color: var(--primary);
  margin-top: 2px;
}

.profile-level {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: var(--sp-2);
  margin-top: var(--sp-2);
}

.profile-level-title {
  font-size: 0.8rem;
  color: var(--text-muted);
}

.profile-xp-text {
  font-size: 0.7rem;
  color: var(--text-soft);
  font-family: var(--font-mono);
}

.profile-stats-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: var(--sp-3);
  margin-bottom: var(--sp-5);
}

.profile-stat {
  text-align: center;
  padding: var(--sp-3);
  background: var(--surface-glass);
  border: 1px solid var(--border);
  border-radius: var(--radius-md);
}

.profile-stat-value {
  display: block;
  font-size: 1.1rem;
  font-weight: 700;
  font-family: var(--font-mono);
  color: var(--text-strong);
}

.profile-stat-label {
  font-size: 0.65rem;
  color: var(--text-soft);
  text-transform: uppercase;
  letter-spacing: 0.05em;
}

.profile-section {
  margin-bottom: var(--sp-4);
}

.profile-section h3 {
  font-size: 0.85rem;
  font-weight: 600;
  color: var(--text-default);
  margin-bottom: var(--sp-3);
}

.profile-equipped-list {
  display: flex;
  flex-direction: column;
  gap: var(--sp-2);
}

.profile-equipped-list > div {
  display: flex;
  justify-content: space-between;
  padding: var(--sp-2);
  background: var(--surface-glass);
  border-radius: var(--radius-sm);
  font-size: 0.8rem;
}

.profile-equipped-list span { color: var(--text-muted); }
.profile-equipped-list strong { color: var(--text-default); }

.profile-achievements-grid {
  display: flex;
  flex-wrap: wrap;
  gap: var(--sp-2);
}

.profile-achievement {
  display: flex;
  align-items: center;
  gap: var(--sp-1);
  padding: 2px 8px;
  background: var(--surface-glass);
  border: 1px solid var(--border);
  border-radius: var(--radius-sm);
  font-size: 0.7rem;
  color: var(--text-default);
}

/* ============================================================
   TERMINAL SKINS — Applied to output panels
   ============================================================ */

.skin-matrix .output-body { color: #00ff41; text-shadow: 0 0 5px rgba(0,255,65,0.3); }
.skin-matrix .output-prompt { color: #00cc33; }

.skin-retro .output-body { color: #ffb000; text-shadow: 0 0 5px rgba(255,176,0,0.3); }
.skin-retro .output-prompt { color: #cc8c00; }

.skin-arctic .output-body { color: #88c0d0; }
.skin-arctic .output-prompt { color: #5e81ac; }

.skin-neon .output-body { color: #e879f9; text-shadow: 0 0 5px rgba(232,121,249,0.3); }
.skin-neon .output-prompt { color: #c026d3; }

/* ============================================================
   DAILY CHALLENGE — Banner
   ============================================================ */

.daily-banner {
  background: rgba(255,106,0,0.04);
  border: 1px solid rgba(255,106,0,0.15);
  border-radius: var(--radius-lg);
  padding: var(--sp-3) var(--sp-4);
  margin-bottom: var(--sp-4);
}

.daily-banner.daily-completed {
  opacity: 0.6;
  border-color: rgba(52,211,153,0.2);
  background: rgba(52,211,153,0.04);
}

.daily-banner.daily-active {
  border-color: var(--primary);
  box-shadow: 0 0 15px rgba(255,106,0,0.08);
}

.daily-banner-head {
  display: flex;
  align-items: center;
  gap: var(--sp-2);
  margin-bottom: var(--sp-2);
}

.daily-badge {
  font-size: 0.65rem;
  font-weight: 700;
  font-family: var(--font-mono);
  color: var(--bg);
  background: var(--primary);
  padding: 1px 8px;
  border-radius: var(--radius-sm);
  text-transform: uppercase;
  letter-spacing: 0.05em;
}

.daily-done-badge {
  font-size: 0.65rem;
  font-weight: 600;
  color: var(--success);
  background: rgba(52,211,153,0.12);
  padding: 1px 8px;
  border-radius: var(--radius-sm);
}

.daily-banner-body {
  display: flex;
  flex-direction: column;
  gap: 2px;
}

.daily-banner-body strong {
  font-size: 0.9rem;
  color: var(--text-strong);
}

.daily-constraint {
  font-size: 0.75rem;
  color: var(--text-muted);
}

.daily-go-btn {
  margin-top: var(--sp-2);
  padding: var(--sp-1) var(--sp-3);
  font-size: 0.75rem;
  font-weight: 600;
  font-family: var(--font-body);
  color: var(--primary);
  background: rgba(255,106,0,0.08);
  border: 1px solid rgba(255,106,0,0.2);
  border-radius: var(--radius-sm);
  cursor: pointer;
  transition: all var(--duration-fast) var(--ease);
  width: fit-content;
}

.daily-go-btn:hover {
  background: rgba(255,106,0,0.15);
}

.daily-reward {
  font-size: 0.7rem;
  font-family: var(--font-mono);
  color: var(--primary);
  margin-top: var(--sp-1);
}

/* ============================================================
   LEADERBOARD
   ============================================================ */

.lb-info {
  padding: var(--sp-3);
  margin-bottom: var(--sp-3);
  font-size: 0.8rem;
  color: var(--text-muted);
}

.lb-list {
  display: flex;
  flex-direction: column;
  gap: var(--sp-2);
}

.lb-row {
  display: flex;
  align-items: center;
  gap: var(--sp-3);
  padding: var(--sp-3);
  background: var(--surface-glass);
  border: 1px solid var(--border);
  border-radius: var(--radius-md);
  transition: all var(--duration-fast) var(--ease);
}

.lb-row:hover {
  border-color: rgba(255,255,255,0.1);
}

.lb-row.lb-me {
  border-color: var(--primary);
  background: rgba(255,106,0,0.05);
}

.lb-rank {
  font-size: 1rem;
  font-weight: 700;
  min-width: 32px;
  text-align: center;
}

.lb-user {
  flex: 1;
  display: flex;
  flex-direction: column;
}

.lb-user strong {
  font-size: 0.85rem;
  color: var(--text-strong);
}

.lb-user-level {
  font-size: 0.7rem;
  color: var(--text-soft);
  font-family: var(--font-mono);
}

.lb-xp {
  font-size: 0.8rem;
  font-weight: 600;
  font-family: var(--font-mono);
  color: var(--primary);
}

.lb-streak {
  font-size: 0.7rem;
  color: #f97316;
}

/* ============================================================
   CYBERPUNK EFFECTS — Boot Sequence, Scanlines
   ============================================================ */

.boot-overlay {
  position: fixed;
  inset: 0;
  background: #000;
  z-index: 99999;
  display: flex;
  align-items: center;
  justify-content: center;
  cursor: pointer;
}

.boot-overlay.boot-fadeout {
  animation: levelupOut 0.5s var(--ease) forwards;
}

.boot-terminal {
  max-width: 500px;
  width: 90%;
  font-family: var(--font-mono);
  font-size: 0.85rem;
  color: var(--primary);
}

.boot-line {
  opacity: 0;
  animation: bootLineIn 0.3s var(--ease) forwards;
  margin-bottom: 4px;
}

.boot-cursor {
  display: inline-block;
  animation: blink 0.6s step-end infinite;
  color: var(--primary);
}

@keyframes bootLineIn {
  0% { opacity: 0; transform: translateX(-5px); }
  100% { opacity: 1; transform: translateX(0); }
}

@keyframes blink {
  0%, 100% { opacity: 1; }
  50% { opacity: 0; }
}

/* ── Subtle scanline overlay (applied to body via class) ───── */
.scanlines::after {
  content: '';
  position: fixed;
  inset: 0;
  pointer-events: none;
  z-index: 9990;
  background: repeating-linear-gradient(
    0deg,
    transparent,
    transparent 2px,
    rgba(0,0,0,0.03) 2px,
    rgba(0,0,0,0.03) 4px
  );
}

/* ── Responsive: compact gamification on medium screens ───── */
@media (max-width: 1400px) {
  .header-gamification .gam-level-title { display: none; }
  .header-gamification .gam-xp-text { display: none; }
  .gam-level-block { min-width: 80px; }
}

@media (max-width: 1200px) {
  .header-gamification .gam-level-block { display: none; }
  .header-brand-subtitle { display: none; }
  .header-brand-credit { display: none; }
}

/* ── Responsive: hide gamification on small screens ────────── */
@media (max-width: 980px) {
  .header-gamification {
    display: none;
  }
}