/* PyPath — theme, motion, and landing polish (loads after style.css) */
@import url('./dropdowns.css');

/* ── Tokens ─────────────────────────────────────────────── */
:root {
  --dur-fast: 150ms;
  --dur-base: 280ms;
  --dur-slow: 500ms;
  --ease-out: cubic-bezier(0.16, 1, 0.3, 1);
  --header-bar: 60px;
  --header-accent: 3px;
  --header-progress: 0px;
  --header-height: calc(var(--header-accent) + var(--header-bar) + var(--header-progress));
  --gradient: var(--primary);
  --gradient-soft: var(--accent);

  /* Warmer, cleaner palette (Adam's Alphabet–inspired) */
  --bg: #FBFAF7;
  --bg-elevated: #F3F1EC;
  --panel: #FFFFFF;
  --text: #1C1917;
  --text-strong: #0C0A09;
  --muted: #57534E;
  --border: #E7E5E0;
  --shadow: 0 4px 20px rgba(28, 25, 23, 0.06);
  --shadow-strong: 0 12px 40px rgba(28, 25, 23, 0.1);
  --warm: #E8A87C;
  --warm-soft: #F5D0B5;
}

[data-theme="dark"] {
  /* Softer charcoal — not near-black */
  --bg: #1e2229;
  --bg-elevated: #282d38;
  --panel: #313744;
  --text: #e8eaef;
  --text-strong: #f4f5f7;
  --muted: #9aa3b2;
  --border: #434a58;
  --shadow: 0 4px 20px rgba(0, 0, 0, 0.2);
  --shadow-strong: 0 12px 40px rgba(0, 0, 0, 0.28);
  --warm: #d4956a;
  --warm-soft: #c4845c;
}

body.page-home {
  --header-progress: 5px;
}

/* ── Typography & theme-aware text (fix stuck black text) ─ */
body {
  font-family: system-ui, -apple-system, "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
  background: var(--bg);
  color: var(--text);
  padding-top: var(--header-height);
}

/* Header no longer uses the accent strip */
body {
  --header-accent: 0px;
}

h1, h2, h3, h4, h5, h6,
.headline, .lesson-title, .page-title,
.founder-showcase-name, .founders-cta-title,
.section-head h2, .feature h3,
.testimonial .quote strong {
  color: var(--text-strong);
}

p, li, .subhead, .founders-cta-subtitle {
  color: var(--text);
}

.muted, .role, .eyebrow, .hint-text {
  color: var(--muted);
}

.gradient-text,
.lesson-content h2,
.cofounder-name {
  background: none;
  -webkit-text-fill-color: unset;
  color: var(--primary-strong);
}

a {
  color: var(--primary);
}

a:hover {
  color: var(--primary-strong);
}

pre.code,
pre.code code,
.page-home .screen pre.code {
  background: #f8f9fa;
  color: #212529;
  border-color: var(--border);
}

[data-theme="dark"] pre.code,
[data-theme="dark"] pre.code code,
[data-theme="dark"] .page-home .screen pre.code {
  background: #282d38;
  color: #e8eaef;
}

/* ── CodeMirror — unified light/dark (pypath theme) ───── */
.cm-s-pypath.CodeMirror {
  background: #f8f9fa;
  color: #1c1917;
  font-family: ui-monospace, SFMono-Regular, Menlo, Monaco, Consolas, monospace;
  font-size: 14px;
  line-height: 1.6;
}

.cm-s-pypath .CodeMirror-gutters {
  background: #f1f3f5;
  border-right: 1px solid var(--border);
}

.cm-s-pypath .CodeMirror-linenumber {
  color: #78716c;
}

.cm-s-pypath .CodeMirror-cursor {
  border-left-color: #1c1917;
}

.cm-s-pypath .CodeMirror-selected {
  background: color-mix(in srgb, var(--primary) 22%, transparent);
}

.cm-s-pypath .CodeMirror-activeline-background {
  background: color-mix(in srgb, var(--primary) 6%, #f8f9fa);
}

[data-theme="dark"] .cm-s-pypath.CodeMirror {
  background: #282d38;
  color: #e8eaef;
}

[data-theme="dark"] .cm-s-pypath .CodeMirror-gutters {
  background: #1e2229;
  border-right-color: #434a58;
}

[data-theme="dark"] .cm-s-pypath .CodeMirror-linenumber {
  color: #9aa3b2;
}

[data-theme="dark"] .cm-s-pypath .CodeMirror-cursor {
  border-left-color: #f4f5f7;
}

[data-theme="dark"] .cm-s-pypath .CodeMirror-selected {
  background: rgba(59, 130, 246, 0.28);
}

[data-theme="dark"] .cm-s-pypath .CodeMirror-activeline-background {
  background: color-mix(in srgb, var(--primary) 10%, #282d38);
}

.interactive-editor .CodeMirror,
.editor-container .CodeMirror {
  background: #f8f9fa;
  color: #1c1917;
}

[data-theme="dark"] .interactive-editor .CodeMirror,
[data-theme="dark"] .editor-container .CodeMirror {
  background: #282d38;
  color: #e8eaef;
}

.code-editor-small {
  background: #f8f9fa;
  color: #1c1917;
}

[data-theme="dark"] .code-editor-small {
  background: #282d38;
  color: #e8eaef;
}

.editor-output,
.output-container {
  background: var(--bg-elevated);
  color: var(--text);
}

/* ── Sidebar collapse (body.sidebar-closed) ─────────────── */
@media (min-width: 981px) {
  body.sidebar-closed .course-sidebar {
    transform: translateX(calc(-100% - 24px)) !important;
    opacity: 0 !important;
    pointer-events: none !important;
  }

  html[data-sidebar="always"] body.sidebar-closed .course-sidebar {
    transform: translateX(calc(-100% - 24px)) !important;
    opacity: 0 !important;
    pointer-events: none !important;
  }

  body.sidebar-closed .layout-course {
    grid-template-columns: minmax(0, 0fr) minmax(0, 1fr) !important;
    gap: 0 !important;
  }

  html[data-sidebar="always"] body:not(.sidebar-closed) .course-sidebar {
    display: block !important;
    transform: none !important;
    opacity: 1 !important;
    pointer-events: auto !important;
  }

  html[data-sidebar="always"] body.sidebar-closed .layout-course {
    grid-template-columns: minmax(0, 0fr) minmax(0, 1fr) !important;
    gap: 0 !important;
  }
}

@media (max-width: 980px) {
  body:not(.sidebar-open) .course-sidebar {
    transform: translateY(-120%) !important;
    pointer-events: none !important;
  }

  body.sidebar-open .course-sidebar {
    transform: none !important;
    pointer-events: auto !important;
  }
}

html[data-sidebar="hidden"] body:not(.sidebar-open) .course-sidebar {
  display: none !important;
}

/* ── Subtle static background (no JS, no animation) ─────── */
body::before,
body::after {
  display: none;
}

.page-home::before {
  content: "";
  position: fixed;
  inset: 0;
  z-index: 0;
  pointer-events: none;
  background:
    radial-gradient(ellipse 80% 55% at 50% -10%, color-mix(in srgb, var(--primary) 10%, transparent), transparent),
    radial-gradient(ellipse 50% 40% at 100% 80%, color-mix(in srgb, var(--warm) 12%, transparent), transparent),
    radial-gradient(ellipse 45% 35% at 0% 70%, color-mix(in srgb, var(--accent) 8%, transparent), transparent);
}

.page-home > * {
  position: relative;
  z-index: 1;
}

/* ── Lightweight scroll reveals (CSS + motion.js) ───────── */
.js-enabled [data-reveal] {
  opacity: 1;
  transition: transform var(--dur-base) var(--ease-out), opacity var(--dur-base) var(--ease-out);
}

.js-enabled [data-reveal="up"],
.js-enabled [data-reveal=""] {
  transform: translateY(20px);
}

.js-enabled [data-reveal="fade"] {
  transform: none;
  opacity: 0.6;
}

.js-enabled [data-reveal="scale"] {
  transform: scale(0.96);
}

.js-enabled [data-reveal="left"] {
  transform: translateX(-24px);
}

.js-enabled [data-reveal="right"] {
  transform: translateX(24px);
}

.js-enabled [data-reveal].is-visible {
  transform: none;
  opacity: 1;
}

/* Legacy reveal classes */
.js-enabled .reveal,
.js-enabled .reveal-up,
.js-enabled .reveal-left,
.js-enabled .reveal-right,
.js-enabled .reveal-scale {
  opacity: 0;
  transition: transform var(--dur-base) var(--ease-out), opacity var(--dur-base) var(--ease-out);
}

.js-enabled .reveal { transform: translateY(16px); }
.js-enabled .reveal-up { transform: translateY(20px); }
.js-enabled .reveal-left { transform: translateX(-20px); }
.js-enabled .reveal-right { transform: translateX(20px); }
.js-enabled .reveal-scale { transform: scale(0.97); }

.js-enabled .reveal.is-visible,
.js-enabled .reveal.revealed,
.js-enabled .reveal-up.is-visible,
.js-enabled .reveal-up.revealed,
.js-enabled .reveal-left.is-visible,
.js-enabled .reveal-left.revealed,
.js-enabled .reveal-right.is-visible,
.js-enabled .reveal-right.revealed,
.js-enabled .reveal-scale.is-visible,
.js-enabled .reveal-scale.revealed {
  opacity: 1;
  transform: none;
}

html.reduced-motion [data-reveal],
html.reduced-motion .reveal,
html.reduced-motion .reveal-up {
  opacity: 1 !important;
  transform: none !important;
  transition: none !important;
}

/* ── Fixed header (Adam's Alphabet–style) ─────────────────── */
body.nav-open {
  overflow: hidden;
}

body.nav-open::before {
  content: "";
  position: fixed;
  inset: 0;
  z-index: 48;
  background: rgba(0, 0, 0, 0.18);
}

.site-header {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  z-index: 50;
  background: var(--panel);
  border-bottom: 1px solid var(--border);
  box-shadow: none;
  transition: box-shadow var(--dur-fast) ease;
}

.site-header.is-scrolled {
  box-shadow: 0 6px 18px color-mix(in srgb, var(--text) 8%, transparent);
}

.header-accent {
  display: none;
}

.site-header .container {
  padding-left: 24px;
  padding-right: 24px;
}

@media (min-width: 1400px) {
  .site-header .container {
    padding-left: 36px;
    padding-right: 36px;
  }
}

.header-inner {
  display: grid;
  grid-template-columns: 1fr auto 1fr;
  align-items: center;
  gap: 12px;
  min-height: var(--header-bar);
  padding-top: 8px;
  padding-bottom: 8px;
}

.header-actions {
  display: contents;
}

.site-header .brand {
  flex-shrink: 0;
  font-size: 1.08rem;
  letter-spacing: -0.02em;
  justify-self: start;
}

.site-header .brand .logo {
  border-radius: 10px;
}

.primary-nav {
  justify-self: center;
}

.header-cta {
  padding: 9px 18px !important;
  font-size: 0.86rem !important;
  font-weight: 700;
  border-radius: 999px !important;
  border-width: 2px !important;
  box-shadow: none;
  white-space: nowrap;
  justify-self: end;
}

.header-cta:hover {
  transform: translateY(-1px);
  box-shadow: var(--shadow-strong);
}

.header-progress {
  padding-bottom: 0;
}

.header-progress .progress-global {
  margin: 0;
  height: 5px;
  border: none;
  border-radius: 0;
  background: var(--bg-elevated);
}

.header-progress .progress-global .bar {
  border-radius: 0;
}

/* Pill nav cluster */
.nav-pill {
  display: flex;
  align-items: center;
  padding: 0;
  background: transparent;
  border: 0;
  border-radius: 999px;
  box-shadow: none;
}

[data-theme="dark"] .nav-pill {
  background: transparent;
  box-shadow: none;
}

[data-theme="dark"] .page-home::before {
  background:
    radial-gradient(ellipse 80% 55% at 50% -10%, color-mix(in srgb, var(--primary) 14%, transparent), transparent),
    radial-gradient(ellipse 50% 40% at 100% 80%, color-mix(in srgb, var(--warm) 10%, transparent), transparent),
    radial-gradient(ellipse 45% 35% at 0% 70%, color-mix(in srgb, var(--accent) 8%, transparent), transparent);
}

[data-theme="dark"] .site-header {
  background: var(--panel);
}

@media (max-width: 980px) {
  .header-inner {
    display: flex;
    justify-content: space-between;
  }
}

.nav-pill .menu {
  display: flex;
  align-items: center;
  gap: 2px;
  list-style: none;
  margin: 0;
  padding: 0;
}

.nav-pill .menu > li {
  display: flex;
  align-items: center;
}

.primary-nav a,
.primary-nav .dd-trigger {
  position: relative;
  padding: 7px 12px;
  border-radius: 999px;
  font-size: 0.875rem;
  font-weight: 600;
  color: var(--muted);
  text-decoration: none;
  transition:
    color var(--dur-fast) ease,
    background-color var(--dur-fast) ease,
    box-shadow var(--dur-fast) ease,
    transform var(--dur-fast) ease;
}

.primary-nav a:focus-visible,
.primary-nav .dd-trigger:focus-visible {
  outline: none;
  box-shadow: var(--ring);
}

.primary-nav a:hover,
.primary-nav .dd-trigger:hover {
  color: var(--text-strong);
  background: color-mix(in srgb, var(--panel) 82%, transparent);
  transform: translateY(-1px);
}

.primary-nav a.active,
.primary-nav .dd-trigger[aria-current="page"],
.primary-nav .dd.is-open > .dd-trigger {
  color: var(--primary-strong);
  background: var(--panel);
  box-shadow:
    0 1px 0 color-mix(in srgb, #fff 50%, transparent),
    0 10px 18px color-mix(in srgb, var(--text) 8%, transparent);
}

.nav-pill .dd-trigger {
  padding: 7px 12px;
  border-radius: 999px;
}

/* Mobile toggle */
.mobile-toggle {
  display: none;
  flex-direction: column;
  justify-content: center;
  align-items: center;
  gap: 5px;
  width: 44px;
  height: 44px;
  padding: 10px;
  border: 1px solid var(--border);
  border-radius: 12px;
  background: var(--panel);
  cursor: pointer;
  transition: border-color var(--dur-fast) ease, background-color var(--dur-fast) ease;
}

.mobile-toggle:hover {
  border-color: color-mix(in srgb, var(--primary) 40%, var(--border));
  background: var(--bg-elevated);
}

.mobile-toggle-bar {
  display: block;
  width: 20px;
  height: 2px;
  border-radius: 2px;
  background: var(--text-strong);
  transition: transform var(--dur-base) var(--ease-out), opacity var(--dur-fast) ease;
  transform-origin: center;
}

.primary-nav[aria-expanded="true"] .mobile-toggle .mobile-toggle-bar:nth-child(1) {
  transform: translateY(7px) rotate(45deg);
}

.primary-nav[aria-expanded="true"] .mobile-toggle .mobile-toggle-bar:nth-child(2) {
  opacity: 0;
}

.primary-nav[aria-expanded="true"] .mobile-toggle .mobile-toggle-bar:nth-child(3) {
  transform: translateY(-7px) rotate(-45deg);
}

@media (max-width: 980px) {
  .header-cta {
    display: none;
  }

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

  .primary-nav {
    display: flex;
    align-items: center;
    gap: 8px;
  }

  .nav-pill {
    position: fixed;
    top: calc(var(--header-accent) + var(--header-bar) + 8px);
    left: 16px;
    right: 16px;
    z-index: 49;
    flex-direction: column;
    align-items: stretch;
    padding: 12px;
    border-radius: 20px;
    background: var(--panel);
    border: 1px solid var(--border);
    box-shadow: var(--shadow-strong);
    opacity: 0;
    visibility: hidden;
    transform: translateY(-10px);
    transition:
      transform var(--dur-base) var(--ease-out),
      opacity var(--dur-base) var(--ease-out),
      visibility 0s linear var(--dur-base);
  }

  .primary-nav[aria-expanded="true"] .nav-pill {
    opacity: 1;
    visibility: visible;
    transform: none;
    transition:
      transform var(--dur-base) var(--ease-out),
      opacity var(--dur-base) var(--ease-out),
      visibility 0s linear 0s;
  }

  .nav-pill .menu {
    flex-direction: column;
    align-items: stretch;
    gap: 4px;
  }

  .nav-pill .menu a,
  .nav-pill .dd-trigger {
    width: 100%;
    justify-content: space-between;
    min-height: 44px;
    padding: 12px 16px;
    border-radius: 12px;
  }

  .nav-pill .dd-panel {
    position: static !important;
    width: 100% !important;
    margin-top: 4px;
    box-shadow: none;
    border: 1px solid var(--border);
  }
}

/* ── Footer ─────────────────────────────────────────────── */
.site-footer {
  margin-top: 80px;
  padding: 56px 0 40px;
  background: var(--bg-elevated);
  border-top: 1px solid var(--border);
}

.footer-grid {
  display: grid;
  grid-template-columns: 1.4fr 1fr 1fr;
  gap: 40px;
  align-items: start;
}

.footer-brand .brand {
  margin-bottom: 12px;
}

.footer-tagline {
  margin: 0 0 16px;
  font-size: 0.95rem;
  line-height: 1.6;
  color: var(--muted);
  max-width: 32ch;
}

.footer-copy {
  margin: 0;
  font-size: 0.85rem;
}

.footer-heading {
  margin: 0 0 14px;
  font-size: 0.75rem;
  font-weight: 700;
  letter-spacing: 0.06em;
  text-transform: uppercase;
  color: var(--muted);
}

.footer-col .footer-links {
  list-style: none;
  margin: 0;
  padding: 0;
  display: flex;
  flex-direction: column;
  gap: 10px;
}

.footer-col .footer-links a {
  color: var(--text);
  text-decoration: none;
  font-weight: 500;
  font-size: 0.95rem;
  transition: color var(--dur-fast) ease;
}

.footer-col .footer-links a:hover {
  color: var(--primary);
}

@media (max-width: 720px) {
  .footer-grid {
    grid-template-columns: 1fr;
    gap: 28px;
  }
}

/* ── Buttons ────────────────────────────────────────────── */
.btn {
  border-radius: 999px;
  border-width: 2px;
  padding: 12px 22px;
  font-size: 0.95rem;
  font-weight: 700;
  box-shadow: var(--shadow);
  transition: transform var(--dur-fast) ease, background-color var(--dur-fast) ease, border-color var(--dur-fast) ease, box-shadow var(--dur-fast) ease;
}

.btn:active {
  transform: scale(0.98);
}

.btn-primary {
  background: var(--primary);
  border-color: var(--primary-strong);
  color: #fff;
}

.btn-primary:hover {
  background: var(--primary-strong);
  color: #fff;
  transform: translateY(-1px);
  box-shadow: var(--shadow-strong);
}

.btn-ghost {
  color: var(--text);
  border-color: var(--border);
  background: var(--panel);
}

.btn-ghost:hover {
  color: var(--primary-strong);
  border-color: color-mix(in srgb, var(--primary) 50%, var(--border));
  background: color-mix(in srgb, var(--primary) 6%, var(--panel));
  transform: translateY(-1px);
}

/* ── Cards & panels ───────────────────────────────────── */
.unit-card,
.about-card,
.panel,
.lesson-overview {
  border-radius: 20px;
  border-width: 1px;
  box-shadow: var(--shadow);
  transition: transform var(--dur-base) var(--ease-out), box-shadow var(--dur-base) ease, border-color var(--dur-base) ease;
}

.unit-card:hover,
.about-card:hover {
  transform: translateY(-3px);
  box-shadow: var(--shadow-strong);
  border-color: color-mix(in srgb, var(--primary) 30%, var(--border));
}

/* ── Landing hero — live editor ─────────────────────────── */
.page-home .hero {
  position: relative;
  padding: clamp(72px, 11vh, 128px) 0 clamp(80px, 12vh, 144px);
  overflow: hidden;
}

.page-home .hero-split {
  position: relative;
  z-index: 1;
  display: grid;
  grid-template-columns: minmax(0, 0.82fr) minmax(0, 1.18fr);
  gap: clamp(48px, 7vw, 96px);
  align-items: center;
}

.page-home .hero-copy {
  text-align: left;
  max-width: 26rem;
}

.page-home .hero-title {
  margin: 0 0 20px;
  font-size: clamp(2.6rem, 5.5vw, 3.75rem);
  line-height: 1.06;
  letter-spacing: -0.04em;
  color: var(--text-strong);
}

.page-home .hero-lead {
  margin: 0 0 36px;
  max-width: 34ch;
  font-size: clamp(1.02rem, 1.6vw, 1.14rem);
  line-height: 1.65;
  color: var(--muted);
}

.page-home .hero-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 14px;
  margin-bottom: 28px;
}

.page-home .hero-footnote {
  margin: 0;
  font-size: 0.78rem;
  line-height: 1.5;
  color: color-mix(in srgb, var(--muted) 88%, transparent);
  letter-spacing: 0.01em;
}

/* Live editor panel */
.page-home .hero-live {
  width: 100%;
  min-width: 0;
}

.page-home .hero-live-editor {
  --hero-shell-bg: var(--panel);
  --hero-toolbar-bg: var(--bg-elevated);
  --hero-toolbar-border: var(--border);
  --hero-code-bg: #f8f9fa;
  --hero-code-text: var(--text);
  --hero-filename: var(--muted);
  --hero-caret: var(--text-strong);
  --hero-selection: color-mix(in srgb, var(--primary) 28%, transparent);
  --hero-output-bg: var(--bg-elevated);
  --hero-output-border: var(--border);
  --hero-output-text: var(--text);
  --hero-output-hint: var(--muted);
  --hero-kbd-bg: color-mix(in srgb, var(--text) 6%, transparent);
  --hero-kbd-border: color-mix(in srgb, var(--border) 80%, var(--text) 12%);
  --hero-kbd-text: var(--muted);
  --hero-scrollbar: color-mix(in srgb, var(--text) 22%, transparent);
  --hero-tok-kw: #7c3aed;
  --hero-tok-fn: #0969da;
  --hero-tok-str: #0a7b4b;
  --hero-tok-builtin: #953800;
  --hero-tok-num: #cf222e;
  --hero-tok-comment: #6e7781;
  --hero-output-success: #047857;
  --hero-output-error: #dc2626;

  border-radius: 18px;
  border: 1px solid var(--border);
  background: var(--hero-shell-bg);
  box-shadow:
    0 1px 0 color-mix(in srgb, var(--text) 4%, transparent) inset,
    var(--shadow-strong);
  overflow: hidden;
}

[data-theme="dark"] .page-home .hero-live-editor {
  --hero-shell-bg: var(--panel);
  --hero-toolbar-bg: color-mix(in srgb, var(--bg) 40%, var(--panel));
  --hero-toolbar-border: var(--border);
  --hero-code-bg: var(--bg-elevated);
  --hero-code-text: var(--text);
  --hero-filename: var(--muted);
  --hero-caret: var(--text-strong);
  --hero-selection: rgba(59, 130, 246, 0.35);
  --hero-output-bg: color-mix(in srgb, var(--bg) 35%, var(--panel));
  --hero-output-border: var(--border);
  --hero-output-text: var(--text);
  --hero-output-hint: var(--muted);
  --hero-kbd-bg: color-mix(in srgb, var(--text) 8%, transparent);
  --hero-kbd-border: var(--border);
  --hero-kbd-text: var(--muted);
  --hero-scrollbar: color-mix(in srgb, var(--text) 24%, transparent);
  --hero-tok-kw: #c4b5fd;
  --hero-tok-fn: #93c5fd;
  --hero-tok-str: #6ee7b7;
  --hero-tok-builtin: #fcd34d;
  --hero-tok-num: #fca5a5;
  --hero-tok-comment: color-mix(in srgb, var(--muted) 85%, transparent);
  --hero-output-success: #6ee7b7;
  --hero-output-error: #fca5a5;

  box-shadow:
    0 1px 0 color-mix(in srgb, var(--text) 6%, transparent) inset,
    var(--shadow-strong);
}

.page-home .hero-live-toolbar {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 12px;
  padding: 12px 16px;
  border-bottom: 1px solid var(--hero-toolbar-border);
  background: var(--hero-toolbar-bg);
}

.page-home .hero-live-file {
  display: flex;
  align-items: center;
  gap: 6px;
  min-width: 0;
}

.page-home .hero-live-dot {
  width: 10px;
  height: 10px;
  border-radius: 50%;
  flex-shrink: 0;
}

.page-home .hero-live-dot:nth-child(1) { background: #ff6b6b; opacity: 0.85; }
.page-home .hero-live-dot:nth-child(2) { background: #feca57; opacity: 0.85; }
.page-home .hero-live-dot:nth-child(3) { background: #1dd1a1; opacity: 0.85; }

.page-home .hero-live-filename {
  margin-left: 6px;
  font-family: ui-monospace, SFMono-Regular, Menlo, Monaco, Consolas, monospace;
  font-size: 0.8rem;
  font-weight: 500;
  color: var(--hero-filename);
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
}

.page-home .hero-live-run {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  flex-shrink: 0;
  min-height: 34px;
  padding: 0 14px 0 12px;
  border: none;
  border-radius: 999px;
  font-size: 0.82rem;
  font-weight: 600;
  letter-spacing: 0.01em;
  color: #fff;
  background: linear-gradient(180deg, color-mix(in srgb, var(--primary) 92%, #fff) 0%, var(--primary) 100%);
  box-shadow: 0 1px 0 rgba(255, 255, 255, 0.15) inset, 0 4px 14px color-mix(in srgb, var(--primary) 35%, transparent);
  cursor: pointer;
  transition: background-color var(--dur-fast) ease, transform var(--dur-fast) ease, box-shadow var(--dur-fast) ease;
}

.page-home .hero-live-run svg {
  flex-shrink: 0;
  opacity: 0.95;
}

.page-home .hero-live-run:hover:not(:disabled) {
  background: color-mix(in srgb, var(--primary) 88%, #000);
}

.page-home .hero-live-run:active:not(:disabled) {
  transform: scale(0.98);
}

.page-home .hero-live-run:disabled {
  opacity: 0.65;
  cursor: wait;
}

.page-home .hero-live-code-wrap {
  position: relative;
  display: grid;
  max-height: 220px;
  overflow: auto;
  background: var(--hero-code-bg);
  scrollbar-width: thin;
  scrollbar-color: var(--hero-scrollbar) transparent;
}

.page-home .hero-live-code-wrap::-webkit-scrollbar {
  width: 8px;
  height: 8px;
}

.page-home .hero-live-code-wrap::-webkit-scrollbar-thumb {
  border-radius: 999px;
  background: var(--hero-scrollbar);
}

.page-home .hero-live-highlight,
.page-home .hero-live-code {
  grid-area: 1 / 1;
  margin: 0;
  padding: 20px 20px 18px;
  border: none;
  font-family: ui-monospace, SFMono-Regular, Menlo, Monaco, Consolas, monospace;
  font-size: clamp(0.86rem, 1.35vw, 0.94rem);
  line-height: 1.65;
  tab-size: 4;
  white-space: pre;
  word-wrap: normal;
  overflow-wrap: normal;
}

.page-home .hero-live-highlight {
  pointer-events: none;
  color: var(--hero-code-text);
  z-index: 0;
}

.page-home .hero-live-highlight code {
  font-family: inherit;
  font-size: inherit;
  line-height: inherit;
}

.page-home .hero-live-highlight .tok-kw { color: var(--hero-tok-kw); }
.page-home .hero-live-highlight .tok-fn { color: var(--hero-tok-fn); }
.page-home .hero-live-highlight .tok-str { color: var(--hero-tok-str); }
.page-home .hero-live-highlight .tok-builtin { color: var(--hero-tok-builtin); }
.page-home .hero-live-highlight .tok-num { color: var(--hero-tok-num); }
.page-home .hero-live-highlight .tok-comment { color: var(--hero-tok-comment); }

.page-home .hero-live-code {
  position: relative;
  z-index: 1;
  display: block;
  width: 100%;
  min-height: 148px;
  resize: none;
  overflow: hidden;
  color: transparent;
  caret-color: var(--hero-caret);
  background: transparent;
  -webkit-text-fill-color: transparent;
}

.page-home .hero-live-code:focus {
  outline: none;
}

.page-home .hero-live-code::selection {
  background: var(--hero-selection);
}

.page-home .hero-live-output-wrap {
  border-top: 1px solid var(--hero-output-border);
  background: var(--hero-output-bg);
}

.page-home .hero-live-output-label {
  display: block;
  padding: 10px 20px 0;
  font-family: ui-monospace, SFMono-Regular, Menlo, Monaco, Consolas, monospace;
  font-size: 0.66rem;
  font-weight: 600;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: var(--hero-output-hint);
}

.page-home .hero-live-output {
  min-height: 64px;
  padding: 8px 20px 18px;
  font-family: ui-monospace, SFMono-Regular, Menlo, Monaco, Consolas, monospace;
  font-size: 0.84rem;
  line-height: 1.55;
  color: var(--hero-output-text);
}

.page-home .hero-live-output.is-active {
  animation: hero-output-in 0.35s ease both;
}

html.reduced-motion .page-home .hero-live-output.is-active {
  animation: none !important;
}

@keyframes hero-output-in {
  from {
    opacity: 0;
    transform: translateY(8px);
  }
  to {
    opacity: 1;
    transform: none;
  }
}

.page-home .hero-live-output-hint,
.page-home .hero-live-output-loading {
  color: var(--hero-output-hint);
}

.page-home .hero-live-output-hint kbd {
  display: inline-block;
  margin: 0 1px;
  padding: 1px 5px;
  border-radius: 4px;
  border: 1px solid var(--hero-kbd-border);
  background: var(--hero-kbd-bg);
  font-family: inherit;
  font-size: 0.78em;
  line-height: 1.4;
  color: var(--hero-kbd-text);
}

.page-home .hero-live-output-text {
  margin: 0;
  white-space: pre-wrap;
  word-break: break-word;
  color: var(--hero-output-success);
}

.page-home .hero-live-output-error {
  margin: 0;
  white-space: pre-wrap;
  word-break: break-word;
  color: var(--hero-output-error);
}

@media (max-width: 900px) {
  .page-home .hero {
    padding: 48px 0 64px;
  }

  .page-home .hero-split {
    grid-template-columns: 1fr;
    gap: 40px;
  }

  .page-home .hero-copy {
    max-width: none;
    text-align: center;
    margin: 0 auto;
  }

  .page-home .hero-lead {
    margin-left: auto;
    margin-right: auto;
  }

  .page-home .hero-actions {
    justify-content: center;
  }

  .page-home .hero-footnote {
    text-align: center;
  }
}

@media (max-width: 480px) {
  .page-home .hero-live-highlight,
  .page-home .hero-live-code {
    min-height: 168px;
    padding: 18px 16px;
  }
}

.page-home .section {
  padding: 64px 0;
}

.page-home .section-head .muted {
  margin: 8px auto 0;
  max-width: 48ch;
}

/* Unit landing lesson list */
.unit-lesson-list {
  margin: 14px 0 0;
  padding-left: 1.25rem;
  display: flex;
  flex-direction: column;
  gap: 10px;
}

.unit-lesson-list a {
  color: var(--text);
  text-decoration: none;
  font-weight: 600;
}

.unit-lesson-list a:hover {
  color: var(--primary-strong);
  text-decoration: underline;
}

/* Features */
.page-home .section-head {
  text-align: center;
  margin-bottom: 36px;
}

.page-home .section-head h2 {
  color: var(--text-strong);
}

.page-home .features-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(240px, 1fr));
  gap: 20px;
}

.page-home .feature {
  padding: 28px;
  border: 1px solid var(--border);
  border-radius: 20px;
  background: var(--panel);
  box-shadow: var(--shadow);
  transition: transform var(--dur-base) var(--ease-out), border-color var(--dur-base) ease, box-shadow var(--dur-base) ease;
}

.page-home .feature:hover {
  transform: translateY(-4px);
  border-color: color-mix(in srgb, var(--primary) 35%, var(--border));
  box-shadow: var(--shadow);
}

.page-home .feature h3 {
  margin: 0 0 8px;
  font-size: 1.1rem;
  color: var(--text-strong);
}

.page-home .feature p {
  margin: 0;
  font-size: 0.95rem;
  color: var(--muted);
}

.page-home .feature-icon {
  width: 44px;
  height: 44px;
  display: grid;
  place-items: center;
  border-radius: 12px;
  background: color-mix(in srgb, var(--primary) 14%, var(--panel));
  color: var(--primary-strong);
  margin-bottom: 14px;
  transition: transform var(--dur-base) var(--ease-out);
}

.page-home .feature:hover .feature-icon {
  transform: scale(1.06);
}

/* Founders */
.page-home .founders-cta {
  padding: 64px 0;
  text-align: center;
}

.page-home .founders-cta-title {
  font-size: clamp(1.75rem, 4vw, 2.5rem);
  color: var(--text-strong);
  margin-bottom: 8px;
}

.page-home .founders-cta-subtitle {
  color: var(--muted);
  margin-bottom: 36px;
}

.page-home .founders-showcase {
  display: flex;
  flex-wrap: wrap;
  justify-content: center;
  gap: 32px;
}

.page-home .founder-showcase-item {
  transition: transform var(--dur-base) var(--ease-out);
}

.page-home .founder-showcase-item:hover {
  transform: translateY(-4px);
}

.page-home .founder-showcase-name {
  font-weight: 600;
  color: var(--text-strong);
}

.page-home .founder-showcase-role {
  font-size: 0.9rem;
  color: var(--muted);
}

/* Testimonials */
.page-home .testimonials {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
  gap: 20px;
}

.page-home .testimonial {
  padding: 28px;
  border: 1px solid var(--border);
  border-radius: 20px;
  background: var(--panel);
  box-shadow: var(--shadow);
  transition: transform var(--dur-base) var(--ease-out), box-shadow var(--dur-base) ease;
}

.page-home .testimonial:hover {
  transform: translateY(-3px);
  box-shadow: var(--shadow);
}

.page-home .testimonial .quote {
  color: var(--text);
  font-style: italic;
  margin-bottom: 16px;
}

.page-home .testimonial .role {
  color: var(--muted);
  font-size: 0.9rem;
}

/* Accent bars */
.feature::before,
.about-card::before,
.lesson-overview::before {
  background: var(--primary);
}

/* ── Lesson sidebar collapse / reopen ───────────────────── */
.sidebar-head {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 10px;
  margin: 0 0 12px;
  padding-bottom: 10px;
  border-bottom: 1px solid var(--border);
}

.sidebar-head .sidebar-unit-label {
  margin: 0 !important;
  padding-bottom: 0 !important;
  flex: 1;
  min-width: 0;
}

.sidebar-collapse-btn {
  flex-shrink: 0;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 34px;
  height: 34px;
  padding: 0;
  border: 1px solid var(--border);
  border-radius: 10px;
  background: var(--bg-elevated);
  color: var(--muted);
  cursor: pointer;
  transition:
    background-color var(--dur-fast) ease,
    border-color var(--dur-fast) ease,
    color var(--dur-fast) ease,
    transform var(--dur-fast) ease;
}

.sidebar-collapse-btn:hover {
  color: var(--primary-strong);
  border-color: color-mix(in srgb, var(--primary) 35%, var(--border));
  background: color-mix(in srgb, var(--primary) 8%, var(--panel));
}

.sidebar-collapse-btn:active {
  transform: scale(0.96);
}

.sidebar-reopen-btn {
  position: fixed;
  left: max(14px, env(safe-area-inset-left));
  top: calc(var(--header-height, 63px) + 14px);
  z-index: 45;
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 9px 14px 9px 11px;
  border: 1px solid var(--border);
  border-radius: 999px;
  background: var(--panel);
  box-shadow: var(--shadow-strong);
  color: var(--text);
  font: inherit;
  font-size: 0.84rem;
  font-weight: 600;
  cursor: pointer;
  transition:
    background-color var(--dur-fast) ease,
    border-color var(--dur-fast) ease,
    color var(--dur-fast) ease,
    transform var(--dur-fast) ease,
    box-shadow var(--dur-fast) ease;
}

.sidebar-reopen-btn:hover {
  color: var(--primary-strong);
  border-color: color-mix(in srgb, var(--primary) 35%, var(--border));
  box-shadow: var(--shadow-strong);
}

.sidebar-reopen-btn:active {
  transform: scale(0.98);
}

.sidebar-reopen-btn[hidden] {
  display: none !important;
}

@media (min-width: 981px) {
  .course-sidebar {
    transition: transform 0.28s var(--ease-out), opacity 0.28s ease;
  }
}

@media (max-width: 980px) {
  .sidebar-reopen-btn {
    display: none !important;
  }

  .sidebar-toggle-btn {
    display: inline-flex !important;
    align-items: center;
    gap: 8px;
    min-height: 40px;
    padding: 8px 14px;
    border: 1px solid var(--border) !important;
    border-radius: 10px !important;
    background: var(--panel);
    font-size: 0.88rem;
    font-weight: 600;
    color: var(--text);
  }

  .sidebar-toggle-btn::before {
    content: "";
    width: 16px;
    height: 16px;
    background: currentColor;
    mask: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' viewBox='0 0 24 24' fill='none' stroke='black' stroke-width='2' stroke-linecap='round' stroke-linejoin='round'%3E%3Cpath d='M9 18l6-6-6-6'/%3E%3Cpath d='M20 6v12'/%3E%3C/svg%3E") center / contain no-repeat;
    -webkit-mask: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' viewBox='0 0 24 24' fill='none' stroke='black' stroke-width='2' stroke-linecap='round' stroke-linejoin='round'%3E%3Cpath d='M9 18l6-6-6-6'/%3E%3Cpath d='M20 6v12'/%3E%3C/svg%3E") center / contain no-repeat;
    opacity: 0.75;
  }
}

/* ── Lesson nav ─────────────────────────────────────────── */
.page-unit .lesson-nav {
  display: flex !important;
  flex-wrap: wrap;
  justify-content: space-between !important;
  align-items: center !important;
  gap: 12px !important;
  margin-top: 48px !important;
  padding: 20px 0 calc(12px + env(safe-area-inset-bottom, 0px)) !important;
  background: transparent !important;
  border-top: 1px solid var(--border) !important;
  position: static !important;
  box-shadow: none !important;
  backdrop-filter: none !important;
  -webkit-backdrop-filter: none !important;
}

.page-unit .lesson-nav > span:empty {
  display: none !important;
}

.page-unit .lesson-nav:not(:has(.btn-ghost)) {
  justify-content: flex-end !important;
}

.page-unit .lesson-nav:not(:has(.btn-primary)) {
  justify-content: flex-start !important;
}

.page-unit .lesson-actions {
  display: flex !important;
  flex-wrap: wrap;
  gap: 10px !important;
  margin-top: 20px !important;
  padding-top: 20px !important;
  border-top: 1px solid var(--border) !important;
}

.page-unit .lesson-actions .btn,
.page-unit .lesson-nav .btn {
  width: auto !important;
  max-width: none !important;
  flex: none !important;
  min-height: 40px !important;
  padding: 0 18px !important;
  margin: 0 !important;
  font-size: 0.9rem !important;
  font-weight: 600 !important;
  border-radius: 10px !important;
}

.page-unit .lesson-nav .btn-primary::after,
.page-unit .lesson-nav .btn-ghost::before {
  content: none !important;
}

@media (max-width: 640px) {
  .page-unit .lesson-nav {
    gap: 10px !important;
  }

  .page-unit .lesson-nav .btn {
    min-height: 38px !important;
    padding: 0 14px !important;
    font-size: 0.86rem !important;
  }
}

/* ── Misc UI ────────────────────────────────────────────── */
.reading-progress {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  height: 3px;
  z-index: 60;
  pointer-events: none;
}

.reading-progress-bar {
  height: 100%;
  background: var(--primary);
  transform-origin: left;
  transform: scaleX(0);
}

.toast-container {
  position: fixed;
  bottom: 20px;
  right: 20px;
  z-index: 100;
  display: flex;
  flex-direction: column;
  gap: 8px;
}

.toast {
  padding: 12px 16px;
  background: var(--panel);
  color: var(--text);
  border: 1px solid var(--border);
  border-radius: 10px;
  box-shadow: var(--shadow);
  opacity: 0;
  transform: translateY(8px);
  transition: opacity var(--dur-base) ease, transform var(--dur-base) ease;
}

.toast.show {
  opacity: 1;
  transform: none;
}

.progress-global {
  height: 4px;
  background: var(--bg-elevated);
  overflow: hidden;
}

.progress-global .bar {
  height: 100%;
  background: var(--primary);
  transition: width var(--dur-base) ease;
}

.dd-panel {
  animation: dd-in var(--dur-base) var(--ease-out);
}

@keyframes dd-in {
  from { opacity: 0; transform: translateY(-6px); }
  to   { opacity: 1; transform: none; }
}

@media (prefers-reduced-motion: reduce) {
  .dd-panel {
    animation: none !important;
  }
}

@media (max-width: 980px) {
  .page-unit .lesson-nav {
    justify-content: space-between !important;
  }
}

/* ── Smooth page navigation ─────────────────────────────── */
@view-transition {
  navigation: auto;
}

::view-transition-old(root) {
  animation: pypath-fade-out 0.18s var(--ease-out) both;
}

::view-transition-new(root) {
  animation: pypath-fade-in 0.22s var(--ease-out) 0.04s both;
}

@keyframes pypath-fade-out {
  to { opacity: 0; }
}

@keyframes pypath-fade-in {
  from { opacity: 0; }
}

#page-transition {
  display: block;
  position: fixed;
  inset: 0;
  z-index: 200;
  pointer-events: none;
  background: var(--bg);
  opacity: 0;
  transition: opacity 0.18s var(--ease-out);
}

#page-transition.is-active {
  opacity: 0.35;
}

.nav-progress {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  height: 3px;
  z-index: 201;
  pointer-events: none;
  opacity: 0;
  transition: opacity 0.12s ease;
}

.nav-progress.is-visible {
  opacity: 1;
}

.nav-progress__bar {
  height: 100%;
  width: 0;
  background: linear-gradient(90deg, var(--primary), var(--accent));
  box-shadow: 0 0 12px color-mix(in srgb, var(--primary) 50%, transparent);
}

.nav-progress.is-active .nav-progress__bar {
  animation: nav-progress-grow 0.45s var(--ease-out) forwards;
}

@keyframes nav-progress-grow {
  0%   { width: 0; }
  20%  { width: 35%; }
  100% { width: 92%; }
}

html.page-from-nav main {
  opacity: 0;
  transform: translateY(10px);
}

html.page-entered main {
  opacity: 1;
  transform: none;
  transition:
    opacity 0.28s var(--ease-out),
    transform 0.28s var(--ease-out);
}

a.route,
.primary-nav a,
.lesson-nav a,
.course-sidebar a,
.footer-links a {
  transition: color var(--dur-fast) ease, background-color var(--dur-fast) ease, opacity var(--dur-fast) ease;
}

a.route:active,
.lesson-nav .btn:active {
  opacity: 0.82;
  transform: scale(0.98);
}

.course-sidebar a {
  border-radius: 10px;
  transition: background-color var(--dur-fast) ease, color var(--dur-fast) ease, padding-left var(--dur-fast) ease;
}

.course-sidebar a:hover {
  background: color-mix(in srgb, var(--primary) 10%, var(--panel));
}

html.reduced-motion ::view-transition-old(root),
html.reduced-motion ::view-transition-new(root) {
  animation: none !important;
}

html.reduced-motion #page-transition,
html.reduced-motion .nav-progress,
html.reduced-motion.page-from-nav main {
  transition: none !important;
  animation: none !important;
  opacity: 1 !important;
  transform: none !important;
}

.visually-hidden {
  position: absolute;
  width: 1px;
  height: 1px;
  padding: 0;
  margin: -1px;
  overflow: hidden;
  clip: rect(0, 0, 0, 0);
  white-space: nowrap;
  border: 0;
}

.panel-row .settings-heading {
  margin: 0 0 4px;
  font-size: 1.05rem;
}

.course-sidebar .sidebar-unit-label {
  margin: 0 0 12px;
  font-size: 0.95rem;
  font-weight: 700;
  color: var(--text-strong);
}

/* ── About page ─────────────────────────────────────────── */
.page-about .site-footer {
  margin-top: 0;
}


.page-about .about-page {
  padding: clamp(40px, 7vh, 72px) clamp(20px, 4vw, 48px) clamp(48px, 8vh, 80px);
  background:
    radial-gradient(ellipse 90% 60% at 50% -20%, color-mix(in srgb, var(--primary) 8%, transparent), transparent),
    var(--bg);
}

.page-about .about-page-inner {
  width: min(1280px, 100%);
  margin: 0 auto;
}

.page-about .about-mission {
  margin-bottom: clamp(36px, 5vw, 56px);
  padding-bottom: clamp(28px, 4vw, 40px);
  border-bottom: 1px solid var(--border);
}

.page-about .about-eyebrow {
  margin: 0 0 14px;
  font-size: 0.76rem;
  font-weight: 600;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  color: var(--primary-strong);
}

.page-about .about-mission-grid {
  display: grid;
  grid-template-columns: minmax(0, 1.15fr) minmax(0, 0.85fr);
  gap: clamp(20px, 4vw, 48px);
  align-items: end;
}

.page-about .about-mission-headline {
  margin: 0;
  font-size: clamp(2rem, 4.5vw, 3rem);
  line-height: 1.08;
  letter-spacing: -0.035em;
  color: var(--text-strong);
}

.page-about .about-mission-lead {
  margin: 0;
  max-width: 34ch;
  font-size: clamp(1rem, 1.4vw, 1.1rem);
  line-height: 1.65;
  color: var(--muted);
}

.page-about .about-team-row {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: clamp(14px, 2vw, 22px);
  align-items: stretch;
}

.page-about .team-card {
  display: flex;
  flex-direction: column;
  align-items: center;
  height: 100%;
  padding: clamp(22px, 2.5vw, 28px) clamp(18px, 2vw, 22px) clamp(20px, 2.2vw, 24px);
  border-radius: 16px;
  border: 1px solid var(--border);
  background: var(--panel);
  box-shadow: var(--shadow);
  text-align: center;
  transition:
    transform var(--dur-base) var(--ease-out),
    box-shadow var(--dur-base) ease,
    border-color var(--dur-base) ease;
}

.page-about .team-card:hover {
  transform: translateY(-2px);
  box-shadow: var(--shadow-strong);
  border-color: color-mix(in srgb, var(--primary) 22%, var(--border));
}

.page-about .team-card-photo {
  flex-shrink: 0;
  width: 120px;
  height: 120px;
  margin: 0 auto 18px;
  padding: 3px;
  border-radius: 50%;
  border: 2px solid color-mix(in srgb, var(--primary) 18%, var(--border));
  background: var(--panel);
}

.page-about .team-card-photo img {
  display: block;
  width: 100%;
  height: 100%;
  border-radius: 50%;
  object-fit: cover;
  object-position: center 20%;
}

.page-about .team-card-body {
  display: flex;
  flex-direction: column;
  align-items: center;
  flex: 1;
  width: 100%;
  min-width: 0;
}

.page-about .team-card-name {
  margin: 0 0 10px;
  font-size: clamp(1.1rem, 1.5vw, 1.22rem);
  font-weight: 700;
  line-height: 1.2;
  letter-spacing: -0.02em;
  color: var(--text-strong);
}

.page-about .team-card-role {
  display: inline-block;
  margin: 0 0 8px;
  padding: 4px 11px;
  border-radius: 999px;
  border: 1px solid color-mix(in srgb, var(--primary) 20%, var(--border));
  background: color-mix(in srgb, var(--primary) 6%, var(--panel));
  font-size: 0.72rem;
  font-weight: 600;
  line-height: 1.35;
  color: var(--primary-strong);
}

.page-about .team-card-school {
  margin: 0 0 16px;
  font-size: 0.76rem;
  line-height: 1.4;
  color: var(--muted);
}

.page-about .team-card-divider {
  width: 100%;
  margin: 0 0 14px;
  border: none;
  border-top: 1px solid var(--border);
}

.page-about .team-card-bio {
  margin: 0;
  font-size: 0.88rem;
  line-height: 1.58;
  color: var(--text);
}

.page-about .about-contact {
  margin-top: clamp(36px, 5vw, 52px);
  padding-top: clamp(24px, 3vw, 32px);
  border-top: 1px solid var(--border);
}

.page-about .about-contact-title {
  margin: 0 0 14px;
  font-size: 0.76rem;
  font-weight: 600;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  color: var(--muted);
}

.page-about .about-contact-list {
  margin: 0;
  padding: 0;
  list-style: none;
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: clamp(12px, 2vw, 24px);
}

.page-about .about-contact-list li {
  display: flex;
  flex-direction: column;
  align-items: flex-start;
  gap: 6px;
  font-size: 0.92rem;
  color: var(--text);
}

.page-about .about-contact-list strong {
  color: var(--text-strong);
}

@media (max-width: 960px) {
  .page-about .about-mission-grid {
    grid-template-columns: 1fr;
    gap: 16px;
  }

  .page-about .about-mission-lead {
    max-width: none;
  }

  .page-about .about-team-row {
    grid-template-columns: 1fr;
  }

  .page-about .about-contact-list {
    grid-template-columns: 1fr;
  }
}

@media (max-width: 640px) {
  .page-about .about-page {
    padding-left: 16px;
    padding-right: 16px;
  }
}

/* ── Sandbox page ───────────────────────────────────────── */
.page-sandbox .site-footer {
  margin-top: 0;
}

.page-sandbox .sandbox-page {
  padding: clamp(32px, 6vh, 56px) clamp(16px, 3vw, 40px) clamp(40px, 6vh, 64px);
  background:
    radial-gradient(ellipse 80% 50% at 50% -15%, color-mix(in srgb, var(--primary) 7%, transparent), transparent),
    var(--bg);
}

.page-sandbox .sandbox-shell {
  width: min(1320px, 100%);
  margin: 0 auto;
}

.page-sandbox .sandbox-head {
  display: flex;
  flex-wrap: wrap;
  align-items: flex-end;
  justify-content: space-between;
  gap: 16px 24px;
  margin-bottom: clamp(24px, 4vw, 36px);
}

.page-sandbox .sandbox-eyebrow {
  margin: 0 0 8px;
  font-size: 0.76rem;
  font-weight: 600;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  color: var(--primary-strong);
}

.page-sandbox .sandbox-title {
  margin: 0 0 8px;
  font-size: clamp(1.75rem, 3.5vw, 2.35rem);
  line-height: 1.1;
  letter-spacing: -0.03em;
  color: var(--text-strong);
}

.page-sandbox .sandbox-lead {
  margin: 0;
  max-width: 42ch;
  font-size: 0.98rem;
  line-height: 1.6;
  color: var(--muted);
}

.page-sandbox .sandbox-shortcuts {
  margin: 0;
  font-size: 0.82rem;
}

.page-sandbox .sandbox-shortcuts kbd {
  display: inline-block;
  margin: 0 1px;
  padding: 2px 6px;
  border-radius: 5px;
  border: 1px solid var(--border);
  background: var(--panel);
  font-family: inherit;
  font-size: 0.78em;
  color: var(--muted);
}

.page-sandbox .sandbox-workspace {
  display: grid;
  grid-template-columns: minmax(200px, 240px) minmax(0, 1fr);
  gap: clamp(14px, 2vw, 20px);
  min-height: min(72vh, 760px);
  align-items: stretch;
}

.page-sandbox .sandbox-projects {
  display: flex;
  flex-direction: column;
  min-height: 0;
  padding: 16px;
  border-radius: 16px;
  border: 1px solid var(--border);
  background: var(--panel);
  box-shadow: var(--shadow);
}

.page-sandbox .sandbox-projects-head {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 10px;
  margin-bottom: 12px;
  padding-bottom: 12px;
  border-bottom: 1px solid var(--border);
}

.page-sandbox .sandbox-projects-title {
  margin: 0;
  font-size: 0.82rem;
  font-weight: 700;
  letter-spacing: 0.04em;
  text-transform: uppercase;
  color: var(--muted);
}

.page-sandbox .sandbox-projects-list {
  display: flex;
  flex-direction: column;
  gap: 6px;
  flex: 1;
  min-height: 0;
  overflow-y: auto;
}

.page-sandbox .sandbox-projects-empty {
  margin: 0;
  padding: 20px 8px;
  text-align: center;
  font-size: 0.88rem;
  line-height: 1.5;
  color: var(--muted);
}

.page-sandbox .project-item {
  display: block;
  width: 100%;
  margin: 0;
  padding: 10px 12px;
  border-radius: 10px;
  border: 1px solid transparent;
  background: transparent;
  color: inherit;
  font: inherit;
  text-align: left;
  cursor: pointer;
  transition:
    background-color var(--dur-fast) ease,
    border-color var(--dur-fast) ease;
}

.page-sandbox .project-item:hover {
  background: var(--bg-elevated);
  border-color: var(--border);
  transform: none;
}

.page-sandbox .project-item.active {
  background: color-mix(in srgb, var(--primary) 9%, var(--panel));
  border-color: color-mix(in srgb, var(--primary) 28%, var(--border));
}

.page-sandbox .project-item-content strong {
  font-size: 0.9rem;
}

.page-sandbox .project-item-content {
  display: flex;
  flex-direction: column;
  gap: 2px;
}

.page-sandbox .project-meta {
  font-size: 0.72rem;
  color: var(--muted);
}

.page-sandbox .sandbox-ide {
  display: flex;
  flex-direction: column;
  min-height: 0;
  height: 100%;
  border-radius: 18px;
  border: 1px solid var(--border);
  background: var(--panel);
  box-shadow: var(--shadow-strong);
  overflow: hidden;
}

.page-sandbox .sandbox-ide-toolbar {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 12px;
  flex-shrink: 0;
  padding: 10px 14px;
  border-bottom: 1px solid var(--border);
  background: var(--bg-elevated);
}

.page-sandbox .sandbox-ide-file {
  display: flex;
  align-items: center;
  gap: 6px;
  min-width: 0;
}

.page-sandbox .sandbox-dot {
  width: 9px;
  height: 9px;
  border-radius: 50%;
  flex-shrink: 0;
}

.page-sandbox .sandbox-dot:nth-child(1) { background: #ff6b6b; opacity: 0.85; }
.page-sandbox .sandbox-dot:nth-child(2) { background: #feca57; opacity: 0.85; }
.page-sandbox .sandbox-dot:nth-child(3) { background: #1dd1a1; opacity: 0.85; }

.page-sandbox .sandbox-filename {
  margin-left: 4px;
  font-family: ui-monospace, SFMono-Regular, Menlo, Monaco, Consolas, monospace;
  font-size: 0.8rem;
  font-weight: 500;
  color: var(--muted);
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
}

.page-sandbox .sandbox-ide-actions {
  display: flex;
  align-items: center;
  gap: 8px;
  flex-shrink: 0;
}

.page-sandbox .sandbox-run-btn {
  min-height: 34px;
  padding: 0 16px;
  border-radius: 999px;
  font-size: 0.84rem;
  font-weight: 600;
}

.page-sandbox .sandbox-delete-btn {
  color: var(--muted);
}

.page-sandbox .sandbox-delete-btn:hover {
  color: #dc2626;
  border-color: color-mix(in srgb, #dc2626 35%, var(--border));
}

.page-sandbox .project-status {
  margin-left: 6px;
  font-size: 0.7rem;
  font-weight: 600;
  padding: 2px 7px;
  border-radius: 999px;
  white-space: nowrap;
}

.page-sandbox .project-status.saved {
  color: #047857;
  background: color-mix(in srgb, #10b981 12%, transparent);
}

.page-sandbox .project-status.unsaved {
  color: #b45309;
  background: color-mix(in srgb, #f59e0b 14%, transparent);
}

.page-sandbox .sandbox-editor-wrap {
  flex: 1 1 auto;
  min-height: 0 !important;
  display: flex;
  flex-direction: column;
  border: none !important;
  border-radius: 0 !important;
  box-shadow: none !important;
  background: transparent !important;
}

.page-sandbox .sandbox-editor-wrap .CodeMirror {
  flex: 1 1 auto;
  height: auto !important;
  min-height: 240px;
  font-size: 14px;
}

.page-sandbox .sandbox-output-wrap {
  flex: 0 0 auto;
  min-height: 140px;
  max-height: 220px;
  border: none !important;
  border-radius: 0 !important;
  box-shadow: none !important;
  border-top: 1px solid var(--border) !important;
  background: color-mix(in srgb, var(--bg) 35%, var(--panel)) !important;
  overflow: hidden;
}

.page-sandbox .sandbox-output-head {
  padding: 8px 14px !important;
  border-bottom: 1px solid var(--border);
}

.page-sandbox .sandbox-output-label {
  font-family: ui-monospace, SFMono-Regular, Menlo, Monaco, Consolas, monospace;
  font-size: 0.66rem;
  font-weight: 600;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: var(--muted);
}

.page-sandbox .sandbox-output-wrap .output-content {
  max-height: 160px;
  overflow-y: auto;
}

.page-sandbox .output-placeholder {
  margin: 0;
  font-style: normal;
  text-align: left;
}

.page-sandbox .output-line.error .output-text,
.page-sandbox .output-line.error .output-label {
  color: #dc2626;
}

[data-theme="dark"] .page-sandbox .output-line.error .output-text,
[data-theme="dark"] .page-sandbox .output-line.error .output-label {
  color: #fca5a5;
}

@media (max-width: 900px) {
  .page-sandbox .sandbox-workspace {
    grid-template-columns: 1fr;
    min-height: auto;
  }

  .page-sandbox .sandbox-projects {
    max-height: 200px;
  }

  .page-sandbox .sandbox-head {
    flex-direction: column;
    align-items: flex-start;
  }
}

@media (max-width: 640px) {
  .page-sandbox .sandbox-ide-toolbar {
    flex-wrap: wrap;
  }

  .page-sandbox .sandbox-ide-actions {
    width: 100%;
    justify-content: flex-end;
  }
}