:root {
  --bg: #080a08;
  --panel: #0f120f;
  --panel-2: #151815;
  --panel-3: #1c201c;
  --line: #292e29;
  --line-soft: rgba(255,255,255,.08);
  --text: #f7f8f6;
  --muted: #9ca39b;
  --muted-2: #6f766f;
  --green: #baff00;
  --green-2: #8fd900;
  --green-soft: rgba(186,255,0,.10);
  --danger: #ff6b6b;
  --radius: 18px;
  --sidebar: 292px;
  --shadow: 0 22px 70px rgba(0,0,0,.28);
}

* { box-sizing: border-box; }
html { scroll-behavior: smooth; }
body {
  margin: 0;
  min-width: 320px;
  min-height: 100vh;
  background: var(--bg);
  color: var(--text);
  font-family: Inter, ui-sans-serif, system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
  font-size: 16px;
  line-height: 1.5;
}
button, input { font: inherit; }
button, a { -webkit-tap-highlight-color: transparent; }
button { color: inherit; }
a { color: inherit; text-decoration: none; }

.noise {
  position: fixed;
  inset: 0;
  pointer-events: none;
  opacity: .035;
  z-index: 999;
  background-image: url("data:image/svg+xml,%3Csvg viewBox='0 0 180 180' xmlns='http://www.w3.org/2000/svg'%3E%3Cfilter id='n'%3E%3CfeTurbulence type='fractalNoise' baseFrequency='.9' numOctaves='2' stitchTiles='stitch'/%3E%3C/filter%3E%3Crect width='100%25' height='100%25' filter='url(%23n)' opacity='.7'/%3E%3C/svg%3E");
}

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

.sidebar {
  position: fixed;
  inset: 0 auto 0 0;
  width: var(--sidebar);
  padding: 22px 16px;
  background: rgba(11,13,11,.97);
  border-right: 1px solid var(--line-soft);
  z-index: 80;
  display: flex;
  flex-direction: column;
  overflow-y: auto;
}

.sidebar-top {
  display: flex;
  align-items: center;
  justify-content: space-between;
  margin: 0 8px 28px;
}

.brand { display: flex; align-items: center; gap: 11px; }
.brand img { width: 116px; height: 32px; object-fit: contain; object-position: left center; }
.brand span {
  color: var(--muted);
  font-size: .72rem;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: .14em;
  border-left: 1px solid var(--line);
  padding-left: 11px;
}

.icon-button {
  width: 42px;
  height: 42px;
  border-radius: 12px;
  border: 1px solid var(--line);
  background: var(--panel);
  display: grid;
  place-items: center;
  cursor: pointer;
}
.icon-button:hover { border-color: #475047; background: var(--panel-2); }
.close-menu, .menu-button { display: none; }

.home-link,
.course-nav button {
  width: 100%;
  min-height: 46px;
  border: 0;
  border-radius: 12px;
  background: transparent;
  color: var(--muted);
  text-align: left;
  padding: 10px 12px;
  display: flex;
  align-items: center;
  gap: 11px;
  cursor: pointer;
  transition: color .2s ease, background .2s ease, transform .2s ease;
}
.home-link:hover, .course-nav button:hover { color: var(--text); background: rgba(255,255,255,.04); }
.home-link.active, .course-nav button.active {
  color: var(--text);
  background: var(--green-soft);
  box-shadow: inset 3px 0 0 var(--green);
}
.nav-icon {
  width: 25px;
  color: var(--green);
  font-size: 1.15rem;
  text-align: center;
  flex: 0 0 auto;
}
.course-nav button span:last-child { line-height: 1.2; font-size: .91rem; }

.sidebar-label {
  color: var(--muted-2);
  text-transform: uppercase;
  letter-spacing: .14em;
  font-size: .7rem;
  font-weight: 800;
  margin: 27px 12px 10px;
}
.course-nav { display: grid; gap: 3px; }

.sidebar-progress {
  margin-top: auto;
  padding: 18px 12px 4px;
}
.mini-progress-head { display: flex; justify-content: space-between; color: var(--muted); font-size: .78rem; margin-bottom: 8px; }
.progress-track { height: 5px; overflow: hidden; background: #252a25; border-radius: 999px; }
.progress-track > span { display: block; height: 100%; width: 0; background: var(--green); border-radius: inherit; transition: width .35s ease; }

.app-shell { min-height: 100vh; margin-left: var(--sidebar); display: flex; flex-direction: column; }
.topbar {
  position: sticky;
  top: 0;
  z-index: 50;
  min-height: 78px;
  padding: 16px clamp(20px, 3vw, 48px);
  display: grid;
  grid-template-columns: minmax(260px, 620px) 1fr;
  align-items: center;
  gap: 24px;
  background: rgba(8,10,8,.84);
  backdrop-filter: blur(20px);
  border-bottom: 1px solid rgba(255,255,255,.05);
}

.search {
  position: relative;
  display: flex;
  align-items: center;
  min-height: 46px;
  gap: 11px;
  padding: 0 13px;
  border: 1px solid var(--line);
  background: var(--panel);
  border-radius: 14px;
}
.search:focus-within { border-color: rgba(186,255,0,.55); box-shadow: 0 0 0 3px rgba(186,255,0,.08); }
.search > span { color: var(--green); font-size: 1.4rem; transform: translateY(-1px); }
.search input { min-width: 0; flex: 1; color: var(--text); border: 0; outline: 0; background: transparent; }
.search input::placeholder { color: #757d75; }
.search kbd { color: var(--muted-2); border: 1px solid var(--line); background: #090b09; padding: 2px 7px; border-radius: 6px; font-size: .68rem; }
.topbar-status { justify-self: end; display: flex; align-items: center; gap: 8px; color: var(--muted); font-size: .82rem; white-space: nowrap; }
.topbar-status i { width: 8px; height: 8px; background: var(--green); border-radius: 50%; box-shadow: 0 0 15px rgba(186,255,0,.7); }

#app { width: 100%; max-width: 1480px; margin: 0 auto; padding: 40px clamp(20px, 3vw, 48px) 72px; flex: 1; }

.eyebrow {
  color: var(--green);
  text-transform: uppercase;
  letter-spacing: .17em;
  font-size: .72rem;
  font-weight: 800;
  margin: 0 0 10px;
}
h1, h2, h3, p { margin-top: 0; }
h1 { font-size: clamp(2.1rem, 4vw, 4.5rem); line-height: .98; letter-spacing: -.055em; max-width: 870px; margin-bottom: 22px; }
h2 { font-size: clamp(1.5rem, 2.3vw, 2.3rem); line-height: 1.08; letter-spacing: -.035em; }
h3 { line-height: 1.25; }
.muted { color: var(--muted); }
.lead { color: #b9c0b8; font-size: clamp(1rem, 1.5vw, 1.18rem); max-width: 730px; line-height: 1.7; }

.hero {
  position: relative;
  min-height: 360px;
  border: 1px solid var(--line-soft);
  border-radius: 26px;
  padding: clamp(32px, 5vw, 70px);
  overflow: hidden;
  background:
    radial-gradient(circle at 88% 5%, rgba(186,255,0,.18), transparent 28%),
    linear-gradient(135deg, #111511 0%, #090b09 65%);
  box-shadow: var(--shadow);
  display: grid;
  align-content: center;
}
.hero::after {
  content: "Z";
  position: absolute;
  right: clamp(10px, 7vw, 110px);
  top: 50%;
  transform: translateY(-52%);
  font-size: clamp(12rem, 24vw, 25rem);
  font-weight: 900;
  line-height: 1;
  color: transparent;
  -webkit-text-stroke: 1px rgba(186,255,0,.17);
  pointer-events: none;
}
.hero-content { position: relative; z-index: 2; max-width: 760px; }
.hero-actions { display: flex; flex-wrap: wrap; gap: 12px; margin-top: 28px; }

.button {
  min-height: 46px;
  border: 1px solid var(--line);
  border-radius: 12px;
  padding: 11px 17px;
  background: var(--panel-2);
  color: var(--text);
  font-weight: 750;
  cursor: pointer;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 9px;
  transition: transform .2s ease, border-color .2s ease, background .2s ease;
}
.button:hover { transform: translateY(-1px); border-color: #4b544b; }
.button.primary { color: #080a08; background: var(--green); border-color: var(--green); }
.button.primary:hover { background: #c8ff36; }
.button.ghost { background: rgba(255,255,255,.03); }
.button.completed { color: var(--green); background: var(--green-soft); border-color: rgba(186,255,0,.3); }

.stats {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 12px;
  margin: 18px 0 54px;
}
.stat {
  padding: 20px;
  border: 1px solid var(--line-soft);
  background: rgba(15,18,15,.75);
  border-radius: 16px;
}
.stat strong { display: block; font-size: 1.55rem; letter-spacing: -.04em; }
.stat span { color: var(--muted); font-size: .78rem; }

.section-head { display: flex; justify-content: space-between; gap: 20px; align-items: end; margin: 0 0 20px; }
.section-head h2 { margin: 0; }
.section-head p { margin: 0; color: var(--muted); }
.course-grid { display: grid; grid-template-columns: repeat(3, minmax(0, 1fr)); gap: 16px; }

.course-card {
  position: relative;
  min-height: 290px;
  padding: 24px;
  border: 1px solid var(--line-soft);
  border-radius: var(--radius);
  background: linear-gradient(150deg, #151815, #0e110e);
  overflow: hidden;
  cursor: pointer;
  display: flex;
  flex-direction: column;
  transition: transform .25s ease, border-color .25s ease, box-shadow .25s ease;
}
.course-card:hover { transform: translateY(-4px); border-color: rgba(186,255,0,.3); box-shadow: 0 20px 40px rgba(0,0,0,.22); }
.course-card::before {
  content: "";
  position: absolute;
  width: 180px;
  height: 180px;
  border-radius: 50%;
  right: -95px;
  top: -100px;
  background: var(--accent, var(--green));
  opacity: .11;
  filter: blur(2px);
}
.course-number { color: var(--accent, var(--green)); font-size: .76rem; font-weight: 800; letter-spacing: .14em; }
.course-card h3 { font-size: 1.35rem; letter-spacing: -.025em; margin: 25px 0 10px; max-width: 280px; }
.course-card p { color: var(--muted); font-size: .91rem; line-height: 1.6; }
.card-bottom { margin-top: auto; }
.card-meta { display: flex; justify-content: space-between; color: var(--muted); font-size: .76rem; margin: 0 0 10px; }
.course-card .progress-track { height: 4px; }

.continue-card {
  margin: -22px 28px 44px;
  position: relative;
  z-index: 3;
  padding: 18px 20px;
  border: 1px solid rgba(186,255,0,.25);
  border-radius: 15px;
  background: rgba(19,24,18,.95);
  box-shadow: var(--shadow);
  display: flex;
  align-items: center;
  gap: 18px;
}
.continue-icon { width: 45px; height: 45px; display: grid; place-items: center; border-radius: 50%; background: var(--green); color: #080a08; flex: 0 0 auto; font-weight: 900; }
.continue-copy { min-width: 0; flex: 1; }
.continue-copy small { color: var(--green); font-weight: 800; text-transform: uppercase; letter-spacing: .1em; }
.continue-copy strong { display: block; white-space: nowrap; overflow: hidden; text-overflow: ellipsis; }

.breadcrumb { display: flex; flex-wrap: wrap; gap: 8px; align-items: center; color: var(--muted); font-size: .82rem; margin-bottom: 28px; }
.breadcrumb button { border: 0; background: none; color: var(--muted); padding: 0; cursor: pointer; }
.breadcrumb button:hover { color: var(--green); }
.breadcrumb b { color: #586058; }

.course-hero {
  border-bottom: 1px solid var(--line-soft);
  padding-bottom: 42px;
  margin-bottom: 35px;
  display: grid;
  grid-template-columns: minmax(0, 1fr) 270px;
  gap: 40px;
  align-items: end;
}
.course-hero h1 { font-size: clamp(2.4rem, 5vw, 5rem); margin-bottom: 18px; }
.course-summary { padding: 22px; border: 1px solid var(--line-soft); border-radius: var(--radius); background: var(--panel); }
.course-summary strong { display: block; font-size: 2.2rem; letter-spacing: -.05em; }
.course-summary span { color: var(--muted); font-size: .82rem; }
.course-summary .progress-track { margin: 16px 0 9px; }

.module-list { display: grid; gap: 14px; }
.module {
  border: 1px solid var(--line-soft);
  border-radius: 16px;
  background: var(--panel);
  overflow: hidden;
}
.module summary {
  list-style: none;
  min-height: 72px;
  padding: 17px 20px;
  display: grid;
  grid-template-columns: 44px 1fr auto;
  gap: 13px;
  align-items: center;
  cursor: pointer;
}
.module summary::-webkit-details-marker { display: none; }
.module summary:hover { background: rgba(255,255,255,.02); }
.module-index { color: #080a08; background: var(--green); border-radius: 10px; width: 38px; height: 38px; display: grid; place-items: center; font-weight: 900; font-size: .78rem; }
.module-title strong { display: block; }
.module-title small { color: var(--muted); }
.module-chevron { color: var(--muted); transition: transform .2s ease; }
.module[open] .module-chevron { transform: rotate(180deg); }
.lesson-list { border-top: 1px solid var(--line-soft); }
.lesson-row {
  width: 100%;
  border: 0;
  border-bottom: 1px solid rgba(255,255,255,.045);
  background: transparent;
  text-align: left;
  padding: 14px 20px 14px 30px;
  display: grid;
  grid-template-columns: 34px minmax(0, 1fr) auto;
  align-items: center;
  gap: 12px;
  cursor: pointer;
}
.lesson-row:last-child { border-bottom: 0; }
.lesson-row:hover { background: rgba(186,255,0,.035); }
.lesson-row.done .lesson-status { background: var(--green); color: #080a08; border-color: var(--green); }
.lesson-status { width: 24px; height: 24px; border: 1px solid #3b423b; border-radius: 50%; display: grid; place-items: center; color: transparent; font-size: .72rem; }
.lesson-name { overflow: hidden; text-overflow: ellipsis; white-space: nowrap; font-size: .94rem; }
.lesson-duration { color: var(--muted-2); font-size: .74rem; }

.lesson-layout { display: grid; grid-template-columns: minmax(0, 1fr) 350px; gap: 24px; align-items: start; }
.player-wrap { border: 1px solid var(--line-soft); border-radius: 18px; background: #000; overflow: hidden; box-shadow: var(--shadow); }
.player { position: relative; width: 100%; aspect-ratio: 16 / 9; }
.player iframe { position: absolute; inset: 0; width: 100%; height: 100%; border: 0; }
.lesson-content { padding: 27px 2px 0; }
.lesson-content h1 { font-size: clamp(1.8rem, 3.5vw, 3.6rem); max-width: 920px; margin-bottom: 13px; }
.lesson-meta { display: flex; flex-wrap: wrap; gap: 8px 18px; color: var(--muted); font-size: .83rem; }
.lesson-actions { display: flex; gap: 10px; flex-wrap: wrap; margin: 28px 0 36px; }
.lesson-note { padding: 19px 20px; background: var(--panel); border: 1px solid var(--line-soft); border-left: 3px solid var(--green); border-radius: 12px; color: var(--muted); }
.lesson-note strong { color: var(--text); }

.curriculum-panel { position: sticky; top: 102px; border: 1px solid var(--line-soft); background: var(--panel); border-radius: 18px; overflow: hidden; max-height: calc(100vh - 126px); display: flex; flex-direction: column; }
.curriculum-head { padding: 19px; border-bottom: 1px solid var(--line-soft); }
.curriculum-head h3 { margin-bottom: 5px; }
.curriculum-head p { color: var(--muted); font-size: .8rem; margin: 0; }
.curriculum-scroll { overflow-y: auto; }
.mini-module-title { padding: 14px 16px 7px; color: var(--muted); text-transform: uppercase; letter-spacing: .08em; font-size: .68rem; font-weight: 800; }
.mini-lesson {
  width: 100%;
  border: 0;
  background: transparent;
  color: var(--muted);
  padding: 10px 14px;
  display: grid;
  grid-template-columns: 23px minmax(0, 1fr);
  gap: 10px;
  text-align: left;
  cursor: pointer;
}
.mini-lesson:hover, .mini-lesson.current { color: var(--text); background: rgba(186,255,0,.06); }
.mini-lesson.current { box-shadow: inset 3px 0 0 var(--green); }
.mini-lesson.done .mini-check { background: var(--green); color: #080a08; border-color: var(--green); }
.mini-check { width: 19px; height: 19px; border: 1px solid #3a403a; border-radius: 50%; display: grid; place-items: center; font-size: .6rem; color: transparent; }
.mini-lesson span:last-child { white-space: nowrap; overflow: hidden; text-overflow: ellipsis; font-size: .8rem; line-height: 1.45; }

.search-title { margin-bottom: 7px; }
.search-count { color: var(--muted); margin-bottom: 30px; }
.result-list { display: grid; gap: 10px; }
.result-card { width: 100%; border: 1px solid var(--line-soft); border-radius: 14px; background: var(--panel); padding: 17px 19px; text-align: left; cursor: pointer; display: grid; grid-template-columns: 42px minmax(0,1fr) auto; align-items: center; gap: 14px; }
.result-card:hover { border-color: rgba(186,255,0,.3); background: var(--panel-2); }
.result-card > span:first-child { width: 38px; height: 38px; border-radius: 10px; display: grid; place-items: center; background: var(--green-soft); color: var(--green); }
.result-card strong { display: block; margin-bottom: 2px; }
.result-card small { color: var(--muted); }
.result-card > span:last-child { color: var(--green); }
.empty-state { min-height: 340px; border: 1px dashed var(--line); border-radius: var(--radius); display: grid; place-items: center; text-align: center; padding: 35px; color: var(--muted); }
.empty-state strong { display: block; color: var(--text); font-size: 1.25rem; margin-bottom: 8px; }

.footer { display: flex; align-items: center; gap: 16px; padding: 24px clamp(20px, 3vw, 48px); border-top: 1px solid var(--line-soft); color: var(--muted-2); font-size: .75rem; }
.footer img { width: 70px; height: 22px; object-fit: contain; object-position: left; opacity: .7; }
.footer p { margin: 0; }
.mobile-backdrop { display: none; }

@media (max-width: 1180px) {
  .course-grid { grid-template-columns: repeat(2, minmax(0, 1fr)); }
  .lesson-layout { grid-template-columns: minmax(0, 1fr) 310px; }
}

@media (max-width: 920px) {
  .sidebar { transform: translateX(-102%); transition: transform .25s ease; box-shadow: 25px 0 70px rgba(0,0,0,.45); }
  body.menu-open .sidebar { transform: translateX(0); }
  .mobile-backdrop { position: fixed; inset: 0; background: rgba(0,0,0,.55); z-index: 70; }
  body.menu-open .mobile-backdrop { display: block; }
  .close-menu, .menu-button { display: grid; }
  .app-shell { margin-left: 0; }
  .topbar { grid-template-columns: auto minmax(0, 1fr); gap: 10px; }
  .topbar-status { display: none; }
  .lesson-layout { grid-template-columns: 1fr; }
  .curriculum-panel { position: static; max-height: 520px; }
  .course-hero { grid-template-columns: 1fr; }
}

@media (max-width: 680px) {
  #app { padding-top: 26px; }
  .topbar { min-height: 68px; padding: 11px 14px; }
  .search { min-height: 44px; }
  .search kbd { display: none; }
  .hero { min-height: 430px; padding: 29px 24px; align-content: end; }
  .hero::after { top: 30%; right: -5px; }
  .stats { grid-template-columns: repeat(2, 1fr); margin-bottom: 42px; }
  .course-grid { grid-template-columns: 1fr; }
  .course-card { min-height: 250px; }
  .section-head { align-items: start; flex-direction: column; }
  .continue-card { margin: -18px 10px 38px; align-items: flex-start; }
  .continue-card .button { display: none; }
  .course-hero { padding-bottom: 30px; gap: 22px; }
  .module summary { grid-template-columns: 40px 1fr auto; padding: 15px 14px; }
  .lesson-row { padding: 13px 14px; grid-template-columns: 28px minmax(0,1fr); }
  .lesson-duration { display: none; }
  .lesson-actions .button { flex: 1 1 100%; }
  .result-card { grid-template-columns: 38px minmax(0,1fr); }
  .result-card > span:last-child { display: none; }
  .footer { flex-direction: column; align-items: flex-start; }
}

@media (prefers-reduced-motion: reduce) {
  *, *::before, *::after { scroll-behavior: auto !important; transition-duration: .01ms !important; animation-duration: .01ms !important; }
}