:root {
  color-scheme: dark;
  --bg: #101815;
  --bg-soft: #151f1a;
  --card: #19241e;
  --card-hover: #1e2c24;
  --text: #f0f5ef;
  --muted: #9aa99e;
  --muted-2: #708076;
  --accent: #a5f36b;
  --accent-dark: #203a25;
  --line: rgba(220, 242, 224, .10);
  --mono: "SFMono-Regular", Consolas, "Liberation Mono", monospace;
  --sans: Inter, ui-sans-serif, system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", Arial, sans-serif;
}

* { box-sizing: border-box; }
html { scroll-behavior: smooth; scroll-padding-top: 28px; }
body {
  margin: 0;
  min-width: 320px;
  background:
    radial-gradient(ellipse at 80% 0%, rgba(77, 125, 72, .13), transparent 34rem),
    var(--bg);
  color: var(--text);
  font-family: var(--sans);
  -webkit-font-smoothing: antialiased;
}
a { color: inherit; }
button, input { font: inherit; }
.site-shell { width: min(1120px, calc(100% - 56px)); margin: 0 auto; }

.topbar {
  height: 82px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  border-bottom: 1px solid var(--line);
}
.brand { display: inline-flex; align-items: center; gap: 11px; text-decoration: none; }
.brand-mark {
  display: grid;
  place-items: center;
  width: 38px;
  height: 38px;
  border: 1px solid rgba(165, 243, 107, .42);
  border-radius: 11px;
  color: var(--accent);
  font: 500 13px var(--mono);
  background: rgba(165, 243, 107, .06);
}
.brand-name { font-size: 12px; font-weight: 800; letter-spacing: .13em; }
.brand-dot { color: var(--accent); }
.top-link { color: var(--muted); font-size: 13px; font-weight: 700; text-decoration: none; transition: color .2s; }
.top-link span { color: var(--accent); margin-left: 7px; }
.top-link:hover, .back-top:hover { color: var(--accent); }

.hero {
  min-height: 440px;
  display: grid;
  grid-template-columns: 1.05fr .95fr;
  align-items: center;
  gap: 30px;
  padding: 66px 4px 72px;
}
.hero-copy { position: relative; z-index: 1; }
.eyebrow {
  display: flex;
  align-items: center;
  gap: 10px;
  color: var(--accent);
  font: 10px var(--mono);
  letter-spacing: .12em;
}
.pulse-dot { width: 7px; height: 7px; border-radius: 50%; background: var(--accent); box-shadow: 0 0 13px rgba(165, 243, 107, .7); }
h1 { margin: 22px 0 17px; font-size: clamp(48px, 6.4vw, 76px); line-height: .99; letter-spacing: -.065em; font-weight: 800; }
h1 span { color: var(--accent); }
.hero-description { max-width: 480px; margin: 0; color: var(--muted); font-size: 14px; line-height: 1.9; }
.primary-button {
  display: inline-flex;
  align-items: center;
  gap: 23px;
  margin-top: 29px;
  padding: 13px 17px;
  border: 1px solid var(--accent);
  border-radius: 8px;
  background: var(--accent);
  color: #172315;
  text-decoration: none;
  font-size: 12px;
  font-weight: 800;
  transition: transform .2s, background .2s;
}
.primary-button:hover { transform: translateY(-2px); background: #b9ff83; }
.primary-button span { font-size: 17px; line-height: 12px; }
.hero-art { min-height: 285px; position: relative; display: grid; place-items: center; }
.orbit { position: absolute; border: 1px solid rgba(165, 243, 107, .12); border-radius: 50%; transform: rotate(-24deg); }
.orbit-one { width: 340px; height: 190px; }
.orbit-two { width: 410px; height: 245px; transform: rotate(34deg); }
.terminal-card {
  position: relative;
  z-index: 1;
  width: min(360px, 88%);
  padding: 0 0 25px;
  border: 1px solid rgba(165, 243, 107, .23);
  border-radius: 13px;
  background: linear-gradient(145deg, #1a2920, #121b16);
  box-shadow: 0 26px 75px rgba(0, 0, 0, .34), 0 0 50px rgba(111, 174, 81, .08);
  transform: rotate(-4deg);
}
.terminal-top { height: 43px; display: flex; align-items: center; gap: 6px; padding: 0 15px; border-bottom: 1px solid var(--line); }
.terminal-top i { width: 7px; height: 7px; border-radius: 50%; background: #53645a; }
.terminal-top i:first-child { background: #d77b6c; }
.terminal-top i:nth-child(2) { background: #dfbd69; }
.terminal-top i:nth-child(3) { background: #8abd70; }
.terminal-top span { margin-left: auto; color: var(--muted-2); font: 10px var(--mono); }
.terminal-code { padding: 25px 20px 0; color: #dce9dd; font: 12px/2.2 var(--mono); }
.terminal-code b { color: #c69af2; font-weight: 500; }
.terminal-code em { color: #f0c978; font-style: normal; }
.terminal-code strong { color: var(--accent); font-weight: 400; }
.code-muted { margin-right: 15px; color: #617268; }
.cursor { display: inline-block; width: 7px; height: 13px; margin-left: 4px; vertical-align: -2px; background: var(--accent); animation: blink 1s steps(2, start) infinite; }
@keyframes blink { to { visibility: hidden; } }
.floating-chip { position: absolute; z-index: 2; padding: 10px 13px; border: 1px solid var(--line); border-radius: 9px; background: #202d25; color: var(--muted); font-size: 10px; box-shadow: 0 12px 28px rgba(0, 0, 0, .22); }
.chip-pdf { top: 31px; right: 3px; transform: rotate(5deg); }
.chip-pdf span { margin-right: 7px; color: var(--accent); font: 10px var(--mono); }
.chip-code { bottom: 25px; left: 3px; color: var(--accent); font: 11px var(--mono); transform: rotate(-7deg); }

.teacher-strip {
  display: flex;
  align-items: center;
  gap: 34px;
  min-height: 98px;
  padding: 18px 24px;
  border: 1px solid var(--line);
  border-radius: 12px;
  background: rgba(25, 36, 30, .78);
}
.teacher-info, .consult-info { display: flex; align-items: center; gap: 14px; }
.avatar { width: 43px; height: 43px; display: grid; place-items: center; border-radius: 50%; background: #2b3b2d; color: var(--accent); font: 12px var(--mono); }
.strip-label { display: block; margin-bottom: 5px; color: var(--muted-2); font: 9px var(--mono); letter-spacing: .1em; }
.teacher-strip strong { font-size: 12px; font-weight: 700; }
.strip-divider { width: 1px; height: 43px; background: var(--line); }
.clock-icon { display: grid; place-items: center; width: 42px; height: 42px; border: 1px solid rgba(165, 243, 107, .2); border-radius: 50%; color: var(--accent); font-size: 23px; }
.room { color: var(--muted); font-weight: 500; }

.materials-section { padding: 105px 0 100px; }
.section-heading { display: flex; align-items: end; justify-content: space-between; gap: 25px; }
.section-eyebrow { margin-bottom: 14px; }
h2 { margin: 0; font-size: clamp(30px, 4vw, 42px); letter-spacing: -.055em; line-height: 1.15; }
h2 span { color: var(--muted); font-weight: 500; }
.section-description { margin: 12px 0 0; color: var(--muted); font-size: 13px; line-height: 1.7; }
.resource-count { display: flex; align-items: baseline; gap: 8px; padding-bottom: 4px; color: var(--muted); white-space: nowrap; font-size: 11px; }
.resource-count strong { color: var(--accent); font: 24px var(--mono); }
.tools-row { display: flex; justify-content: space-between; align-items: center; gap: 18px; margin: 34px 0 27px; }
.search-box { display: flex; align-items: center; gap: 11px; width: min(390px, 100%); height: 46px; padding: 0 13px; border: 1px solid var(--line); border-radius: 8px; background: #141e18; }
.search-box:focus-within { border-color: rgba(165, 243, 107, .62); box-shadow: 0 0 0 3px rgba(165, 243, 107, .07); }
.search-icon { color: var(--accent); font-size: 23px; line-height: 1; transform: rotate(-20deg); }
.search-box input { min-width: 0; flex: 1; border: 0; outline: 0; background: transparent; color: var(--text); font-size: 11px; }
.search-box input::placeholder { color: #738177; }
kbd { padding: 3px 5px; border: 1px solid var(--line); border-radius: 4px; color: var(--muted-2); font: 9px var(--mono); }
.filter-list { display: flex; flex-wrap: wrap; justify-content: flex-end; gap: 6px; }
.filter-button { padding: 9px 12px; border: 1px solid transparent; border-radius: 7px; background: transparent; color: var(--muted); cursor: pointer; font-size: 10px; font-weight: 700; transition: .2s; }
.filter-button:hover { color: var(--text); background: rgba(255,255,255,.04); }
.filter-button.active { border-color: rgba(165, 243, 107, .25); background: rgba(165, 243, 107, .09); color: var(--accent); }
.materials-grid { display: grid; grid-template-columns: repeat(3, minmax(0, 1fr)); gap: 13px; }
.material-card {
  display: flex;
  flex-direction: column;
  min-height: 190px;
  padding: 19px;
  border: 1px solid var(--line);
  border-radius: 10px;
  background: var(--card);
  transition: transform .2s, border-color .2s, background .2s;
}
.material-card:hover { transform: translateY(-3px); border-color: rgba(165, 243, 107, .28); background: var(--card-hover); }
.card-top { display: flex; align-items: center; justify-content: space-between; margin-bottom: 21px; }
.file-icon { display: grid; place-items: center; width: 37px; height: 39px; border: 1px solid rgba(165, 243, 107, .2); border-radius: 7px; background: rgba(165, 243, 107, .07); color: var(--accent); font: 10px var(--mono); }
.category-label { color: var(--muted-2); font: 9px var(--mono); letter-spacing: .07em; text-transform: uppercase; }
.material-card h3 { margin: 0 0 7px; font-size: 14px; line-height: 1.45; font-weight: 800; }
.material-card p { margin: 0; color: var(--muted); font-size: 10px; line-height: 1.65; }
.card-actions { display: flex; align-items: center; justify-content: space-between; gap: 10px; margin-top: auto; padding-top: 19px; }
.file-type { color: var(--muted-2); font: 9px var(--mono); }
.open-link { display: inline-flex; align-items: center; gap: 7px; color: var(--accent); text-decoration: none; font-size: 10px; font-weight: 800; }
.open-link span { transition: transform .2s; }
.open-link:hover span { transform: translate(2px, -2px); }
.empty-state { padding: 55px 20px; text-align: center; border: 1px dashed var(--line); border-radius: 10px; }
.empty-icon { color: var(--accent); font-size: 28px; }
.empty-state h3 { margin: 9px 0 5px; font-size: 15px; }
.empty-state p { margin: 0; color: var(--muted); font-size: 12px; }
.text-button { margin-top: 15px; padding: 7px 0; border: 0; background: none; color: var(--accent); cursor: pointer; font-size: 11px; font-weight: 800; }
.footer { display: flex; align-items: center; justify-content: space-between; gap: 20px; min-height: 87px; border-top: 1px solid var(--line); }
.footer-brand .brand-mark { width: 31px; height: 31px; border-radius: 8px; font-size: 10px; }
.footer-brand .brand-name { font-size: 10px; }
.footer p, .back-top { color: var(--muted-2); font-size: 10px; }
.back-top { text-decoration: none; transition: color .2s; }

@media (max-width: 820px) {
  .site-shell { width: min(100% - 40px, 680px); }
  .hero { min-height: 400px; grid-template-columns: 1fr .8fr; gap: 10px; padding: 55px 0; }
  .hero-art { transform: scale(.84); }
  .materials-section { padding: 80px 0; }
  .tools-row { align-items: stretch; flex-direction: column; }
  .search-box { width: 100%; }
  .filter-list { justify-content: flex-start; }
  .materials-grid { grid-template-columns: repeat(2, minmax(0, 1fr)); }
}
@media (max-width: 560px) {
  .site-shell { width: calc(100% - 32px); }
  .topbar { height: 68px; }
  .hero { display: block; padding: 58px 0 35px; }
  h1 { font-size: clamp(51px, 15vw, 68px); }
  .hero-description { max-width: 430px; font-size: 13px; }
  .hero-art { min-height: 215px; margin-top: 19px; transform: scale(.82); }
  .orbit-one { width: 290px; height: 165px; }
  .orbit-two { width: 340px; height: 200px; }
  .teacher-strip { align-items: stretch; flex-direction: column; gap: 16px; padding: 17px; }
  .strip-divider { width: 100%; height: 1px; }
  .teacher-strip strong { font-size: 11px; }
  .materials-section { padding: 70px 0; }
  .section-heading { align-items: flex-start; }
  h2 { font-size: 31px; }
  .resource-count { flex-direction: column; align-items: flex-end; gap: 0; padding-top: 8px; font-size: 9px; }
  .resource-count strong { font-size: 21px; }
  .filter-list { gap: 3px; }
  .filter-button { padding: 8px 9px; font-size: 9px; }
  .materials-grid { grid-template-columns: 1fr; gap: 10px; }
  .material-card { min-height: 170px; }
  .footer { flex-wrap: wrap; padding: 20px 0; }
  .footer p { order: 3; width: 100%; margin: 0; }
}
@media (prefers-reduced-motion: reduce) {
  *, *::before, *::after { scroll-behavior: auto !important; animation-duration: .01ms !important; animation-iteration-count: 1 !important; transition-duration: .01ms !important; }
}