:root {
  color-scheme: dark;
  --bg: #080b12;
  --bg-soft: #0e1420;
  --panel: rgba(18, 25, 39, .86);
  --panel-strong: #151d2d;
  --ink: #f5f8ff;
  --muted: #a7b4c9;
  --faint: #748199;
  --line: rgba(255,255,255,.12);
  --accent: #7dd3fc;
  --accent-2: #a78bfa;
  --success: #86efac;
  --warning: #facc15;
  --danger: #fb7185;
  --shadow: 0 24px 90px rgba(0,0,0,.44);
  --radius-xl: 30px;
  --radius-lg: 22px;
  --radius-md: 14px;
  --max: 1180px;
  --mono: ui-monospace, SFMono-Regular, Menlo, Monaco, Consolas, "Liberation Mono", monospace;
  --sans: Inter, ui-sans-serif, system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
}
* { box-sizing: border-box; }
html { scroll-behavior: smooth; }
body {
  margin: 0;
  font-family: var(--sans);
  color: var(--ink);
  line-height: 1.55;
  background:
    radial-gradient(circle at 12% 0%, rgba(125,211,252,.22), transparent 31rem),
    radial-gradient(circle at 83% 4%, rgba(167,139,250,.19), transparent 28rem),
    linear-gradient(180deg, #080b12 0%, #0b111c 48%, #080b12 100%);
}
a { color: inherit; text-decoration: none; }
button, textarea { font: inherit; }
.shell { width: min(var(--max), calc(100% - 36px)); margin-inline: auto; }
.skip-link { position: absolute; left: 16px; top: -80px; z-index: 20; padding: 10px 14px; border-radius: 999px; background: var(--ink); color: var(--bg); }
.skip-link:focus { top: 16px; }
.site-header { position: sticky; top: 0; z-index: 10; backdrop-filter: blur(18px); background: rgba(8,11,18,.75); border-bottom: 1px solid var(--line); }
.nav { min-height: 74px; display: flex; align-items: center; justify-content: space-between; gap: 16px; }
.brand { display: inline-flex; align-items: center; gap: 12px; }
.brand strong { display: block; letter-spacing: -.035em; }
.brand small { display: block; color: var(--muted); font-size: .78rem; margin-top: -2px; }
.mark { width: 40px; height: 40px; border-radius: 13px; display: grid; place-items: center; color: #071018; font: 900 .88rem var(--mono); background: linear-gradient(135deg, var(--accent), var(--accent-2)); box-shadow: 0 14px 34px rgba(125,211,252,.23); }
nav { display: flex; gap: 6px; flex-wrap: wrap; justify-content: flex-end; }
nav a { color: var(--muted); padding: 9px 11px; border-radius: 999px; font-size: .94rem; }
nav a:hover, nav a:focus-visible { background: rgba(255,255,255,.07); color: var(--ink); outline: 0; }
.hero { min-height: calc(100vh - 74px); display: grid; grid-template-columns: 1.05fr .95fr; align-items: center; gap: 38px; padding: 68px 0; }
.eyebrow { color: var(--accent); text-transform: uppercase; letter-spacing: .16em; font-size: .78rem; font-weight: 800; }
h1, h2, h3, p { margin-top: 0; }
h1 { font-size: clamp(2.6rem, 7vw, 5.7rem); line-height: .92; letter-spacing: -.075em; margin-bottom: 22px; }
h2 { font-size: clamp(1.8rem, 3vw, 3rem); line-height: 1; letter-spacing: -.05em; margin-bottom: 14px; }
h3 { margin-bottom: 8px; }
.hero-text, .section-heading p, .muted { color: var(--muted); }
.hero-text { max-width: 64ch; font-size: 1.08rem; }
.hero-actions, .lesson-nav { display: flex; gap: 12px; flex-wrap: wrap; margin-top: 24px; }
.button, .small-button { border: 0; cursor: pointer; transition: transform .18s ease, border-color .18s ease, background .18s ease; }
.button { display: inline-flex; min-height: 46px; align-items: center; justify-content: center; padding: 0 18px; border-radius: 999px; font-weight: 760; }
.button:hover, .small-button:hover { transform: translateY(-1px); }
.primary { color: #06101a; background: linear-gradient(135deg, var(--accent), var(--accent-2)); }
.ghost { color: var(--ink); background: rgba(255,255,255,.06); border: 1px solid var(--line); }
.stats { display: flex; gap: 10px; flex-wrap: wrap; margin-top: 26px; }
.stats span { padding: 9px 12px; border: 1px solid var(--line); border-radius: 999px; color: var(--muted); background: rgba(255,255,255,.04); }
.stats strong { color: var(--ink); }
.hero-card, .module-panel, .lesson-panel, .playground-grid, .project-grid article { border: 1px solid var(--line); border-radius: var(--radius-xl); background: var(--panel); box-shadow: var(--shadow); }
.hero-card { overflow: hidden; }
.terminal-bar { height: 44px; display: flex; gap: 8px; align-items: center; padding: 0 18px; background: rgba(255,255,255,.055); border-bottom: 1px solid var(--line); }
.terminal-bar span { width: 11px; height: 11px; border-radius: 50%; background: var(--danger); }
.terminal-bar span:nth-child(2) { background: var(--warning); }
.terminal-bar span:nth-child(3) { background: var(--success); }
pre { margin: 0; padding: 24px; overflow-x: auto; }
code, textarea { font-family: var(--mono); }
.dashboard, .playground, .projects { padding: 72px 0; }
.section-heading { max-width: 760px; margin-bottom: 28px; }
.layout { display: grid; grid-template-columns: 360px 1fr; gap: 20px; align-items: start; }
.module-panel, .lesson-panel { padding: 18px; }
.panel-head, .lesson-topline { display: flex; align-items: center; justify-content: space-between; gap: 12px; margin-bottom: 14px; }
.module-list { display: grid; gap: 10px; }
.module-card { width: 100%; text-align: left; color: var(--ink); border: 1px solid var(--line); background: rgba(255,255,255,.045); border-radius: 18px; padding: 14px; cursor: pointer; }
.module-card.active { border-color: rgba(125,211,252,.65); background: rgba(125,211,252,.1); }
.module-card.done h4::after { content: " ✓"; color: var(--success); }
.module-card h4 { margin: 0 0 5px; }
.module-card p { margin: 0; color: var(--muted); font-size: .92rem; }
.small-button { min-height: 36px; padding: 0 12px; border-radius: 999px; color: var(--ink); background: rgba(255,255,255,.07); border: 1px solid var(--line); }
.small-button.success { border-color: rgba(134,239,172,.45); color: #dfffe9; }
.badge { display: inline-flex; border-radius: 999px; padding: 7px 10px; border: 1px solid rgba(125,211,252,.35); color: #dff7ff; background: rgba(125,211,252,.1); font-size: .88rem; }
.lesson-body { display: grid; gap: 16px; margin-top: 22px; }
.lesson-body section { padding: 16px; border: 1px solid var(--line); border-radius: var(--radius-lg); background: rgba(255,255,255,.035); }
.lesson-body ul, .lesson-body ol { margin: 8px 0 0; padding-left: 22px; color: var(--muted); }
.lesson-body li + li { margin-top: 6px; }
.playground-grid { display: grid; grid-template-columns: 1fr 370px; gap: 20px; padding: 20px; }
.editor-label { color: var(--muted); display: grid; gap: 10px; }
textarea { width: 100%; min-height: 280px; resize: vertical; border-radius: 18px; border: 1px solid var(--line); padding: 16px; color: var(--ink); background: #070a10; outline: none; }
textarea:focus { border-color: rgba(125,211,252,.7); box-shadow: 0 0 0 4px rgba(125,211,252,.1); }
.preview-card { align-self: stretch; border-radius: 24px; padding: 24px; background: linear-gradient(145deg, rgba(125,211,252,.15), rgba(167,139,250,.14)); border: 1px solid rgba(255,255,255,.14); display: flex; flex-direction: column; align-items: flex-start; justify-content: center; }
.avatar { width: 62px; height: 62px; border-radius: 22px; display: grid; place-items: center; background: rgba(255,255,255,.14); font-size: 1.9rem; margin-bottom: 18px; }
.preview-card p { color: var(--muted); }
.preview-card span { color: var(--accent); margin-bottom: 18px; }
.preview-card button { border: 0; border-radius: 999px; padding: 12px 16px; color: #06101a; background: var(--success); font-weight: 800; }
.hint { margin: 18px 0 0; font-size: .9rem; }
.project-grid { display: grid; grid-template-columns: repeat(4, 1fr); gap: 14px; background: transparent; border: 0; box-shadow: none; }
.project-grid article { padding: 20px; }
.project-grid span { color: var(--accent); font-family: var(--mono); }
.project-grid p, .footer { color: var(--muted); }
.footer { padding: 42px 0 110px; }
.hermes-tutor { position: fixed; right: 22px; bottom: 22px; z-index: 40; display: grid; justify-items: end; gap: 12px; pointer-events: none; }
.hermes-tutor > * { pointer-events: auto; }
.hermes-tutor-toggle { display: inline-flex; align-items: center; gap: 10px; min-height: 52px; padding: 0 16px 0 10px; border: 1px solid rgba(125,211,252,.45); border-radius: 999px; color: var(--ink); background: rgba(10, 16, 27, .9); box-shadow: 0 20px 70px rgba(0,0,0,.42); backdrop-filter: blur(16px); cursor: pointer; font-weight: 800; }
.hermes-tutor-toggle:hover, .hermes-tutor-toggle:focus-visible { outline: 0; transform: translateY(-1px); border-color: rgba(167,139,250,.75); }
.hermes-tutor-orb { width: 36px; height: 36px; border-radius: 50%; display: grid; place-items: center; color: #06101a; background: linear-gradient(135deg, var(--accent), var(--accent-2)); box-shadow: 0 0 28px rgba(125,211,252,.32); }
.hermes-tutor-panel { width: min(410px, calc(100vw - 28px)); overflow: hidden; border: 1px solid rgba(255,255,255,.16); border-radius: 26px; background: rgba(10, 16, 27, .94); box-shadow: 0 30px 100px rgba(0,0,0,.55); backdrop-filter: blur(18px); }
.hermes-tutor-head { display: flex; justify-content: space-between; gap: 16px; align-items: center; padding: 16px 16px 12px; border-bottom: 1px solid var(--line); background: linear-gradient(135deg, rgba(125,211,252,.12), rgba(167,139,250,.1)); }
.hermes-tutor-head strong, .hermes-tutor-head small { display: block; }
.hermes-tutor-head small { color: var(--muted); margin-top: 2px; }
.hermes-tutor-close { width: 34px; height: 34px; border: 1px solid var(--line); border-radius: 50%; color: var(--ink); background: rgba(255,255,255,.06); cursor: pointer; font-size: 1.25rem; }
.hermes-tutor-log { max-height: 320px; overflow-y: auto; display: grid; gap: 10px; padding: 14px; }
.hermes-message { width: fit-content; max-width: 88%; margin: 0; padding: 11px 13px; border-radius: 16px; border: 1px solid var(--line); color: var(--ink); background: rgba(255,255,255,.06); white-space: pre-wrap; }
.hermes-message.user { justify-self: end; color: #071018; border: 0; background: linear-gradient(135deg, var(--accent), var(--accent-2)); }
.hermes-message.bot { justify-self: start; }
.hermes-message.pending { color: var(--muted); font-style: italic; }
.hermes-message.error { border-color: rgba(251,113,133,.42); color: #ffd7de; }
.hermes-tutor-form { display: grid; grid-template-columns: 1fr auto; gap: 10px; padding: 14px; border-top: 1px solid var(--line); }
.hermes-tutor-form textarea { min-height: 48px; max-height: 140px; border-radius: 16px; padding: 11px 12px; }
.hermes-tutor-form button { border: 0; border-radius: 16px; padding: 0 15px; font-weight: 850; cursor: pointer; }
@media (max-width: 920px) {
  .hero, .layout, .playground-grid { grid-template-columns: 1fr; }
  .hero { min-height: auto; }
  .project-grid { grid-template-columns: repeat(2, 1fr); }
}
@media (max-width: 620px) {
  .nav { align-items: flex-start; flex-direction: column; padding: 14px 0; }
  h1 { font-size: 3rem; }
  .project-grid { grid-template-columns: 1fr; }
  .hermes-tutor { right: 14px; bottom: 14px; }
  .hermes-tutor-toggle span:last-child { display: none; }
  .hermes-tutor-form { grid-template-columns: 1fr; }
  .hermes-tutor-form button { min-height: 42px; }
}