:root {
  --bg0: #050812;
  --bg1: #070f1e;
  --softBlack: rgba(7, 15, 30, 0.9);

  --white: #ffffff;
  --silver: #d9e3f2;
  --text: rgba(244, 249, 255, 0.92);
  --muted: rgba(220, 235, 255, 0.72);
  --faint: rgba(220, 235, 255, 0.56);

  --blue: #4ea6ff;
  --blue2: #76d4ff;
  --ice: rgba(215, 226, 242, 0.18);

  --glass: rgba(255, 255, 255, 0.06);
  --glass2: rgba(255, 255, 255, 0.085);
  --stroke: rgba(200, 223, 255, 0.14);
  --stroke2: rgba(200, 223, 255, 0.22);

  --shadow: 0 24px 90px rgba(0, 0, 0, 0.55);
  --shadow2: 0 12px 34px rgba(0, 0, 0, 0.36);
  --shadow3: 0 10px 28px rgba(78, 166, 255, 0.1);

  --r12: 12px;
  --r16: 16px;
  --r18: 18px;
  --r22: 22px;
  --r28: 28px;

  --sidebarW: 280px;
  --rightW: 360px;
  --contentMax: 1200px;
}

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

html {
  scroll-behavior: smooth;
}

body {
  margin: 0;
  font-family: Inter, system-ui, -apple-system, Segoe UI, Roboto, Arial, sans-serif;
  color: var(--text);
  background:
    radial-gradient(1200px 720px at 10% 10%, rgba(78, 166, 255, 0.22), transparent 58%),
    radial-gradient(900px 600px at 92% 18%, rgba(118, 212, 255, 0.14), transparent 62%),
    radial-gradient(900px 900px at 58% 110%, rgba(217, 227, 242, 0.1), transparent 65%),
    linear-gradient(180deg, var(--bg0), var(--bg1));
  min-height: 100vh;
  overflow-x: hidden;
}

a {
  color: inherit;
  text-decoration: none;
}

button,
input {
  font: inherit;
  color: inherit;
}

.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;
}

.skip-link {
  position: absolute;
  left: 12px;
  top: -44px;
  padding: 10px 12px;
  border-radius: 12px;
  background: rgba(255, 255, 255, 0.12);
  border: 1px solid var(--stroke);
  box-shadow: var(--shadow2);
  z-index: 9999;
}
.skip-link:focus {
  top: 12px;
  outline: 2px solid rgba(78, 166, 255, 0.7);
  outline-offset: 2px;
}

.glass {
  background: linear-gradient(180deg, rgba(255, 255, 255, 0.075), rgba(255, 255, 255, 0.04));
  border: 1px solid var(--stroke);
  backdrop-filter: blur(16px);
  -webkit-backdrop-filter: blur(16px);
  box-shadow: var(--shadow2);
}

.app {
  display: grid;
  grid-template-columns: var(--sidebarW) 1fr;
  min-height: 100vh;
}

/* Sidebar */
.sidebar {
  position: sticky;
  top: 0;
  height: 100vh;
  padding: 18px 14px;
  border-right: 1px solid rgba(200, 223, 255, 0.09);
  background: rgba(5, 8, 18, 0.62);
  backdrop-filter: blur(18px);
  -webkit-backdrop-filter: blur(18px);
}

.sidebar-top {
  display: grid;
  grid-template-columns: 1fr auto;
  align-items: center;
  gap: 10px;
  padding: 6px 6px 14px;
}

.brand {
  display: flex;
  align-items: center;
  gap: 12px;
  padding: 8px 10px;
  border-radius: 16px;
  transition: background 160ms ease;
}
.brand:hover {
  background: rgba(255, 255, 255, 0.04);
}
.brand:focus-visible {
  outline: 2px solid rgba(78, 166, 255, 0.7);
  outline-offset: 2px;
}

.brand-mark {
  width: 40px;
  height: 40px;
  border-radius: 16px;
  background:
    radial-gradient(16px 16px at 30% 30%, rgba(255, 255, 255, 0.8), rgba(255, 255, 255, 0) 65%),
    linear-gradient(135deg, rgba(78, 166, 255, 1), rgba(118, 212, 255, 0.35)),
    linear-gradient(180deg, rgba(255, 255, 255, 0.16), rgba(255, 255, 255, 0.02));
  border: 1px solid rgba(217, 227, 242, 0.28);
  box-shadow:
    0 18px 56px rgba(78, 166, 255, 0.18),
    inset 0 0 0 1px rgba(255, 255, 255, 0.12);
}

.brand-text {
  display: grid;
  line-height: 1.05;
}
.brand-title {
  font-weight: 800;
  letter-spacing: -0.02em;
}
.brand-subtitle {
  color: var(--faint);
  font-size: 12px;
  letter-spacing: 0.16em;
  text-transform: uppercase;
}

.sidebar-toggle {
  width: 44px;
  height: 44px;
  border-radius: 16px;
  border: 1px solid rgba(200, 223, 255, 0.14);
  background: rgba(255, 255, 255, 0.05);
  display: grid;
  place-items: center;
  cursor: pointer;
  transition: background 160ms ease, border-color 160ms ease;
}
.sidebar-toggle:hover {
  background: rgba(255, 255, 255, 0.075);
  border-color: rgba(200, 223, 255, 0.2);
}
.sidebar-toggle:focus-visible {
  outline: 2px solid rgba(78, 166, 255, 0.7);
  outline-offset: 2px;
}

.sidebar-toggle-lines {
  width: 18px;
  height: 2px;
  background: rgba(244, 249, 255, 0.9);
  border-radius: 99px;
  position: relative;
}
.sidebar-toggle-lines::before,
.sidebar-toggle-lines::after {
  content: "";
  position: absolute;
  left: 0;
  width: 18px;
  height: 2px;
  border-radius: 99px;
  background: rgba(244, 249, 255, 0.75);
}
.sidebar-toggle-lines::before {
  top: -6px;
}
.sidebar-toggle-lines::after {
  top: 6px;
}

.sidebar-nav {
  display: grid;
  gap: 6px;
  padding: 10px 6px;
}

.nav-item {
  display: grid;
  grid-template-columns: 34px 1fr;
  gap: 10px;
  align-items: center;
  padding: 12px 12px;
  border-radius: 16px;
  color: var(--muted);
  border: 1px solid transparent;
  transition:
    transform 160ms ease,
    background 160ms ease,
    border-color 160ms ease,
    color 160ms ease;
}
.nav-item:hover {
  background: rgba(255, 255, 255, 0.04);
  color: rgba(244, 249, 255, 0.9);
}
.nav-item:focus-visible {
  outline: 2px solid rgba(78, 166, 255, 0.7);
  outline-offset: 2px;
}
.nav-item.is-active {
  background: linear-gradient(135deg, rgba(78, 166, 255, 0.14), rgba(118, 212, 255, 0.06));
  border-color: rgba(78, 166, 255, 0.18);
  color: rgba(244, 249, 255, 0.92);
}

.nav-icon {
  width: 34px;
  height: 34px;
  border-radius: 14px;
  display: grid;
  place-items: center;
  background: rgba(255, 255, 255, 0.03);
  border: 1px solid rgba(200, 223, 255, 0.08);
  color: rgba(217, 227, 242, 0.92);
}

.sidebar-foot {
  position: absolute;
  left: 14px;
  right: 14px;
  bottom: 16px;
}

.sidebar-card {
  border-radius: 22px;
  padding: 14px;
}
.side-kicker {
  margin: 0;
  color: var(--faint);
  font-size: 12px;
  letter-spacing: 0.14em;
  text-transform: uppercase;
}
.side-title {
  margin: 6px 0 6px;
  font-weight: 800;
  letter-spacing: -0.02em;
}
.side-text {
  margin: 0;
  color: var(--muted);
  line-height: 1.55;
}

/* Content split (main + right) */
.content {
  display: grid;
  grid-template-columns: 1fr var(--rightW);
  align-items: start;
}

/* Topbar */
.topbar {
  grid-column: 1 / -1;
  position: sticky;
  top: 0;
  z-index: 40;
  display: grid;
  grid-template-columns: 1.1fr 1.2fr 0.9fr;
  gap: 14px;
  align-items: center;
  padding: 14px 18px;
  border-bottom: 1px solid rgba(200, 223, 255, 0.08);
  background: rgba(5, 8, 18, 0.58);
  backdrop-filter: blur(18px);
  -webkit-backdrop-filter: blur(18px);
}

.topbar-left {
  display: flex;
  align-items: center;
  gap: 12px;
  min-width: 0;
}

.welcome {
  display: grid;
  gap: 2px;
  min-width: 0;
}
.welcome-kicker {
  margin: 0;
  color: var(--faint);
  font-size: 12px;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
}
.welcome-title {
  margin: 0;
  font-weight: 700;
  letter-spacing: -0.02em;
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
}

.mobile-menu {
  display: none;
  width: 46px;
  height: 46px;
  border-radius: 16px;
  border: 1px solid rgba(200, 223, 255, 0.14);
  background: rgba(255, 255, 255, 0.05);
  cursor: pointer;
  place-items: center;
}
.mobile-menu:focus-visible {
  outline: 2px solid rgba(78, 166, 255, 0.7);
  outline-offset: 2px;
}
.mobile-lines {
  width: 18px;
  height: 2px;
  border-radius: 99px;
  background: rgba(244, 249, 255, 0.9);
  position: relative;
}
.mobile-lines::before,
.mobile-lines::after {
  content: "";
  position: absolute;
  left: 0;
  width: 18px;
  height: 2px;
  border-radius: 99px;
  background: rgba(244, 249, 255, 0.75);
}
.mobile-lines::before {
  top: -6px;
}
.mobile-lines::after {
  top: 6px;
}

.search {
  display: grid;
  grid-template-columns: 28px 1fr auto;
  gap: 10px;
  align-items: center;
  padding: 10px 12px;
  border-radius: 18px;
  background: rgba(255, 255, 255, 0.05);
  border: 1px solid rgba(200, 223, 255, 0.12);
  box-shadow: var(--shadow3);
}
.search:focus-within {
  border-color: rgba(118, 212, 255, 0.26);
  box-shadow: 0 0 0 4px rgba(78, 166, 255, 0.12);
}
.search-icon {
  color: rgba(217, 227, 242, 0.9);
}
.search input {
  width: 100%;
  border: 0;
  outline: none;
  background: transparent;
  color: rgba(244, 249, 255, 0.92);
}
.search input::placeholder {
  color: rgba(220, 235, 255, 0.55);
}
.search-kbd {
  padding: 6px 10px;
  border-radius: 12px;
  border: 1px solid rgba(200, 223, 255, 0.12);
  background: rgba(255, 255, 255, 0.04);
  color: rgba(220, 235, 255, 0.68);
  font-size: 12px;
}

.topbar-right {
  display: flex;
  justify-content: flex-end;
  align-items: center;
  gap: 10px;
}

.icon-btn {
  position: relative;
  width: 46px;
  height: 46px;
  border-radius: 16px;
  border: 1px solid rgba(200, 223, 255, 0.14);
  background: rgba(255, 255, 255, 0.05);
  cursor: pointer;
  display: grid;
  place-items: center;
  transition: transform 160ms ease, background 160ms ease, border-color 160ms ease;
}
.icon-btn:hover {
  transform: translateY(-1px);
  background: rgba(255, 255, 255, 0.075);
  border-color: rgba(200, 223, 255, 0.2);
}
.icon-btn:focus-visible {
  outline: 2px solid rgba(78, 166, 255, 0.7);
  outline-offset: 2px;
}
.icon-dot {
  position: absolute;
  top: 10px;
  right: 12px;
  width: 8px;
  height: 8px;
  border-radius: 50%;
  background: rgba(118, 212, 255, 0.95);
  box-shadow: 0 0 18px rgba(118, 212, 255, 0.5);
}

.user {
  display: grid;
  grid-template-columns: 40px 1fr;
  gap: 10px;
  align-items: center;
  padding: 8px 12px 8px 8px;
  border-radius: 18px;
  border: 1px solid rgba(200, 223, 255, 0.14);
  background: rgba(255, 255, 255, 0.05);
  cursor: pointer;
  transition: transform 160ms ease, background 160ms ease, border-color 160ms ease;
}
.user:hover {
  transform: translateY(-1px);
  background: rgba(255, 255, 255, 0.075);
  border-color: rgba(200, 223, 255, 0.2);
}
.user:focus-visible {
  outline: 2px solid rgba(78, 166, 255, 0.7);
  outline-offset: 2px;
}
.avatar {
  width: 40px;
  height: 40px;
  border-radius: 16px;
  background:
    radial-gradient(16px 16px at 30% 30%, rgba(255, 255, 255, 0.75), rgba(255, 255, 255, 0) 65%),
    linear-gradient(135deg, rgba(217, 227, 242, 0.55), rgba(78, 166, 255, 0.18));
  border: 1px solid rgba(217, 227, 242, 0.22);
  box-shadow: 0 18px 50px rgba(78, 166, 255, 0.12);
}
.user-meta {
  display: grid;
  gap: 2px;
  text-align: left;
}
.user-name {
  font-weight: 700;
  letter-spacing: -0.02em;
  line-height: 1.1;
}
.user-role {
  color: var(--faint);
  font-size: 12px;
  letter-spacing: 0.12em;
  text-transform: uppercase;
}

/* Main area */
.main {
  padding: 18px 18px 28px;
  max-width: var(--contentMax);
}

.section {
  margin-top: 18px;
}
.section-head {
  display: grid;
  gap: 8px;
  margin: 6px 0 14px;
}
.section-title {
  margin: 0;
  font-size: 18px;
  letter-spacing: -0.02em;
}
.section-subtitle {
  margin: 0;
  color: var(--muted);
  line-height: 1.55;
}

/* Hero */
.hero {
  border-radius: var(--r28);
  padding: 22px;
  position: relative;
  overflow: hidden;
  box-shadow: var(--shadow), var(--shadow3);
}
.hero-canvas {
  position: absolute;
  inset: 0;
  width: 100%;
  height: 100%;
  opacity: 0.92;
}
.hero-overlay {
  position: absolute;
  inset: 0;
  background:
    radial-gradient(900px 520px at 20% 20%, rgba(118, 212, 255, 0.12), transparent 60%),
    radial-gradient(700px 420px at 85% 30%, rgba(78, 166, 255, 0.14), transparent 62%),
    linear-gradient(180deg, rgba(7, 15, 30, 0.2), rgba(7, 15, 30, 0.5));
  pointer-events: none;
}
.hero-inner {
  position: relative;
  display: grid;
  grid-template-columns: 1.2fr 0.8fr;
  gap: 18px;
  align-items: center;
}
.hero-eyebrow {
  margin: 0 0 10px;
  color: var(--faint);
  font-size: 12px;
  letter-spacing: 0.18em;
  text-transform: uppercase;
}
.hero-title {
  margin: 0;
  font-size: clamp(26px, 3.2vw, 40px);
  letter-spacing: -0.03em;
  line-height: 1.08;
  background: linear-gradient(180deg, rgba(255, 255, 255, 0.98), rgba(217, 227, 242, 0.76));
  -webkit-background-clip: text;
  background-clip: text;
  color: transparent;
}
.hero-subtitle {
  margin: 12px 0 16px;
  color: var(--muted);
  line-height: 1.6;
  max-width: 70ch;
}
.hero-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
}
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 10px;
  padding: 12px 16px;
  border-radius: 16px;
  border: 1px solid transparent;
  cursor: pointer;
  user-select: none;
  transition:
    transform 180ms ease,
    box-shadow 180ms ease,
    background 180ms ease,
    border-color 180ms ease;
  font-weight: 700;
  letter-spacing: -0.01em;
}
.btn:hover {
  transform: translateY(-1px);
}
.btn:focus-visible {
  outline: 2px solid rgba(78, 166, 255, 0.75);
  outline-offset: 2px;
}
.btn-primary {
  background:
    radial-gradient(18px 18px at 30% 25%, rgba(255, 255, 255, 0.55), rgba(255, 255, 255, 0) 64%),
    linear-gradient(135deg, rgba(78, 166, 255, 0.98), rgba(118, 212, 255, 0.3));
  border-color: rgba(118, 212, 255, 0.26);
  box-shadow: 0 22px 60px rgba(78, 166, 255, 0.18);
  color: rgba(255, 255, 255, 0.96);
}
.btn-ghost {
  background: rgba(255, 255, 255, 0.05);
  border-color: rgba(200, 223, 255, 0.16);
  color: rgba(244, 249, 255, 0.9);
}
.btn-secondary {
  background: rgba(255, 255, 255, 0.06);
  border-color: rgba(200, 223, 255, 0.18);
  color: rgba(244, 249, 255, 0.92);
}
.btn:disabled {
  opacity: 0.7;
  cursor: not-allowed;
  transform: none !important;
}

.hero-signals {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
  margin-top: 14px;
}
.signal {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  padding: 10px 12px;
  border-radius: 999px;
  background: rgba(255, 255, 255, 0.04);
  border: 1px solid rgba(200, 223, 255, 0.12);
  color: var(--muted);
  font-size: 13px;
}
.signal-dot {
  width: 8px;
  height: 8px;
  border-radius: 50%;
  background: rgba(118, 212, 255, 0.95);
  box-shadow: 0 0 16px rgba(118, 212, 255, 0.45);
}
.signal-dot-alt {
  background: rgba(217, 227, 242, 0.92);
  box-shadow: 0 0 16px rgba(217, 227, 242, 0.35);
}

.hero-glass-stack {
  display: grid;
  justify-items: end;
}
.stack-card {
  width: min(100%, 360px);
  border-radius: 26px;
  padding: 16px;
  position: relative;
  overflow: hidden;
}
.stack-card::before {
  content: "";
  position: absolute;
  inset: -2px;
  background: radial-gradient(620px 320px at 25% 10%, rgba(118, 212, 255, 0.12), transparent 60%);
  pointer-events: none;
}
.stack-top {
  position: relative;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 10px;
  padding-bottom: 10px;
  border-bottom: 1px solid rgba(200, 223, 255, 0.12);
}
.stack-kicker {
  margin: 0;
  color: var(--faint);
  font-size: 12px;
  letter-spacing: 0.14em;
  text-transform: uppercase;
}
.stack-badge {
  margin: 0;
  padding: 8px 10px;
  border-radius: 999px;
  background: rgba(78, 166, 255, 0.12);
  border: 1px solid rgba(78, 166, 255, 0.18);
  font-weight: 700;
  font-size: 12px;
}
.stack-title {
  position: relative;
  margin: 12px 0 8px;
  font-weight: 800;
  letter-spacing: -0.03em;
  font-size: 20px;
}
.stack-text {
  position: relative;
  margin: 0 0 12px;
  color: var(--muted);
  line-height: 1.6;
}
.stack-pills {
  position: relative;
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
}
.pill {
  padding: 8px 10px;
  border-radius: 999px;
  border: 1px solid rgba(200, 223, 255, 0.12);
  background: rgba(255, 255, 255, 0.04);
  color: rgba(220, 235, 255, 0.75);
  font-size: 12px;
  letter-spacing: 0.1em;
  text-transform: uppercase;
}

/* Stats */
.stats {
  display: grid;
  grid-template-columns: repeat(12, 1fr);
  gap: 12px;
}
.stat {
  grid-column: span 3;
  border-radius: 22px;
  padding: 14px;
  position: relative;
  overflow: hidden;
  transition: transform 180ms ease, border-color 180ms ease, background 180ms ease;
}
.stat:hover {
  transform: translateY(-2px);
  border-color: rgba(118, 212, 255, 0.22);
  background: linear-gradient(180deg, rgba(255, 255, 255, 0.09), rgba(255, 255, 255, 0.045));
}
.stat::after {
  content: "";
  position: absolute;
  inset: -2px;
  background: radial-gradient(520px 260px at 20% 0%, rgba(78, 166, 255, 0.12), transparent 58%);
  pointer-events: none;
  opacity: 0.85;
}
.stat-icon {
  position: relative;
  width: 40px;
  height: 40px;
  border-radius: 16px;
  display: grid;
  place-items: center;
  background: rgba(78, 166, 255, 0.1);
  border: 1px solid rgba(78, 166, 255, 0.18);
  box-shadow: 0 18px 50px rgba(78, 166, 255, 0.12);
}
.stat-label {
  position: relative;
  margin: 10px 0 6px;
  color: var(--faint);
  font-size: 12px;
  letter-spacing: 0.14em;
  text-transform: uppercase;
}
.stat-value {
  position: relative;
  margin: 0;
  font-size: 28px;
  font-weight: 900;
  letter-spacing: -0.04em;
}
.stat-suffix {
  font-size: 16px;
  font-weight: 800;
  color: rgba(220, 235, 255, 0.75);
  margin-left: 2px;
}
.stat-foot {
  position: relative;
  margin: 6px 0 0;
  color: var(--muted);
  font-size: 13px;
}

/* Courses */
.course-row {
  display: grid;
  gap: 12px;
}
.course {
  border-radius: 26px;
  padding: 14px;
  display: grid;
  grid-template-columns: 1fr auto;
  gap: 14px;
  align-items: center;
  transition: transform 180ms ease, border-color 180ms ease, background 180ms ease;
}
.course:hover {
  transform: translateY(-2px);
  border-color: rgba(118, 212, 255, 0.2);
  background: linear-gradient(180deg, rgba(255, 255, 255, 0.09), rgba(255, 255, 255, 0.045));
}
.course-left {
  display: grid;
  grid-template-columns: 50px 1fr;
  gap: 12px;
  align-items: start;
}
.course-icon {
  width: 50px;
  height: 50px;
  border-radius: 18px;
  display: grid;
  place-items: center;
  background: rgba(118, 212, 255, 0.08);
  border: 1px solid rgba(118, 212, 255, 0.18);
  color: rgba(217, 227, 242, 0.95);
  box-shadow: 0 18px 46px rgba(78, 166, 255, 0.12);
}
.course-title {
  margin: 0;
  font-weight: 900;
  letter-spacing: -0.03em;
}
.course-desc {
  margin: 6px 0 10px;
  color: var(--muted);
  line-height: 1.55;
}
.course-tags {
  display: flex;
  gap: 8px;
  flex-wrap: wrap;
}
.tag {
  padding: 8px 10px;
  border-radius: 999px;
  background: rgba(255, 255, 255, 0.04);
  border: 1px solid rgba(200, 223, 255, 0.12);
  color: rgba(220, 235, 255, 0.74);
  font-size: 12px;
}

.course-right {
  min-width: 220px;
  display: grid;
  gap: 8px;
  justify-items: end;
}
.progress {
  width: 220px;
  height: 10px;
  border-radius: 999px;
  background: rgba(255, 255, 255, 0.05);
  border: 1px solid rgba(200, 223, 255, 0.12);
  overflow: hidden;
}
.progress-bar {
  height: 100%;
  width: 0;
  border-radius: 999px;
  background: linear-gradient(90deg, rgba(78, 166, 255, 0.9), rgba(118, 212, 255, 0.35));
  box-shadow: 0 0 30px rgba(78, 166, 255, 0.18);
}
.progress-text {
  margin: 0;
  color: var(--faint);
  font-size: 12px;
  letter-spacing: 0.12em;
  text-transform: uppercase;
}

/* Virtual Lab */
.virtual {
  border-radius: 28px;
  padding: 16px;
  position: relative;
  overflow: hidden;
}
.virtual-bg {
  position: absolute;
  inset: -2px;
  background:
    radial-gradient(680px 420px at 20% 20%, rgba(118, 212, 255, 0.14), transparent 60%),
    radial-gradient(680px 420px at 85% 45%, rgba(78, 166, 255, 0.16), transparent 60%),
    linear-gradient(180deg, rgba(255, 255, 255, 0.03), rgba(255, 255, 255, 0.01));
  opacity: 0.95;
}
.virtual-inner {
  position: relative;
  display: grid;
  grid-template-columns: 1.1fr 0.9fr;
  gap: 14px;
  align-items: center;
}
.virtual-kicker {
  margin: 0;
  color: var(--faint);
  font-size: 12px;
  letter-spacing: 0.14em;
  text-transform: uppercase;
}
.virtual-title {
  margin: 10px 0 8px;
  font-size: 22px;
  font-weight: 900;
  letter-spacing: -0.03em;
}
.virtual-text {
  margin: 0 0 12px;
  color: var(--muted);
  line-height: 1.6;
}
.virtual-actions {
  display: flex;
  gap: 10px;
  flex-wrap: wrap;
}
.virtual-visual {
  position: relative;
  height: 220px;
  border-radius: 26px;
  border: 1px solid rgba(200, 223, 255, 0.14);
  background: rgba(5, 8, 18, 0.2);
  overflow: hidden;
}
.holo {
  position: absolute;
  border-radius: 18px;
  border: 1px solid rgba(118, 212, 255, 0.18);
  background: rgba(118, 212, 255, 0.06);
  box-shadow: 0 26px 90px rgba(78, 166, 255, 0.14);
  backdrop-filter: blur(8px);
  -webkit-backdrop-filter: blur(8px);
  animation: float 6.5s ease-in-out infinite;
}
.h1 {
  width: 110px;
  height: 70px;
  left: 18px;
  top: 26px;
  animation-delay: -1s;
}
.h2 {
  width: 140px;
  height: 84px;
  right: 20px;
  top: 48px;
  animation-delay: -2s;
}
.h3 {
  width: 120px;
  height: 62px;
  left: 56px;
  bottom: 22px;
  animation-delay: -3s;
}
.h4 {
  width: 88px;
  height: 54px;
  right: 68px;
  bottom: 30px;
  animation-delay: -2.5s;
}
.holo-ring {
  position: absolute;
  left: 50%;
  top: 50%;
  width: 240px;
  height: 240px;
  transform: translate(-50%, -50%);
  border-radius: 50%;
  border: 1px solid rgba(217, 227, 242, 0.16);
  box-shadow: inset 0 0 0 1px rgba(78, 166, 255, 0.06);
  opacity: 0.85;
  animation: spin 18s linear infinite;
}

/* AI */
.ai-grid {
  display: grid;
  grid-template-columns: repeat(12, 1fr);
  gap: 12px;
}
.ai-card {
  grid-column: span 6;
  border-radius: 26px;
  padding: 14px;
  display: grid;
  gap: 10px;
  transition: transform 180ms ease, border-color 180ms ease, background 180ms ease;
}
.ai-card:hover {
  transform: translateY(-2px);
  border-color: rgba(118, 212, 255, 0.2);
  background: linear-gradient(180deg, rgba(255, 255, 255, 0.09), rgba(255, 255, 255, 0.045));
}
.ai-icon {
  width: 42px;
  height: 42px;
  border-radius: 16px;
  display: grid;
  place-items: center;
  background: rgba(78, 166, 255, 0.1);
  border: 1px solid rgba(78, 166, 255, 0.18);
}
.ai-title {
  margin: 0;
  font-weight: 900;
  letter-spacing: -0.03em;
}
.ai-text {
  margin: 0;
  color: var(--muted);
  line-height: 1.6;
}

/* Right panel */
.right {
  position: sticky;
  top: 76px;
  height: calc(100vh - 76px);
  padding: 18px 18px 22px 0;
  overflow: auto;
}
.right-inner {
  display: grid;
  gap: 12px;
  padding-right: 18px;
}
.right-card {
  border-radius: 26px;
  padding: 14px;
}
.right-head {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 10px;
  padding-bottom: 10px;
  border-bottom: 1px solid rgba(200, 223, 255, 0.12);
  margin-bottom: 10px;
}
.right-title {
  margin: 0;
  font-size: 14px;
  font-weight: 900;
  letter-spacing: -0.02em;
}
.right-pill {
  padding: 8px 10px;
  border-radius: 999px;
  border: 1px solid rgba(200, 223, 255, 0.12);
  background: rgba(255, 255, 255, 0.04);
  color: rgba(220, 235, 255, 0.74);
  font-size: 12px;
}
.right-list {
  list-style: none;
  padding: 0;
  margin: 0;
  display: grid;
  gap: 10px;
}
.item-title {
  margin: 0;
  font-weight: 800;
  letter-spacing: -0.02em;
}
.item-meta {
  margin: 4px 0 0;
  color: var(--muted);
  font-size: 13px;
}

.advance-title {
  margin: 0;
  font-weight: 900;
  letter-spacing: -0.03em;
}
.advance-text {
  margin: 8px 0 12px;
  color: var(--muted);
  line-height: 1.6;
}
.advance-bar {
  height: 10px;
  border-radius: 999px;
  background: rgba(255, 255, 255, 0.05);
  border: 1px solid rgba(200, 223, 255, 0.12);
  overflow: hidden;
}
.advance-bar-fill {
  height: 100%;
  width: 0;
  border-radius: 999px;
  background: linear-gradient(90deg, rgba(217, 227, 242, 0.7), rgba(78, 166, 255, 0.22));
}

/* Footer */
.footer {
  margin-top: 22px;
  padding: 18px 10px 10px;
  border-top: 1px solid rgba(200, 223, 255, 0.08);
}
.footer-title {
  margin: 0;
  font-weight: 900;
  letter-spacing: -0.03em;
}
.footer-subtitle {
  margin: 6px 0 0;
  color: var(--muted);
  line-height: 1.6;
}

/* Drawer (mobile) */
.drawer {
  position: fixed;
  inset: 0;
  z-index: 90;
  display: none;
}
.drawer.is-open {
  display: block;
}
.drawer-backdrop {
  position: absolute;
  inset: 0;
  background: rgba(0, 0, 0, 0.45);
  backdrop-filter: blur(6px);
  -webkit-backdrop-filter: blur(6px);
}
.drawer-panel {
  position: absolute;
  left: 12px;
  top: 12px;
  bottom: 12px;
  width: min(360px, calc(100% - 24px));
  border-radius: 28px;
  padding: 14px;
  transform: translateX(-8px);
  animation: drawerIn 260ms ease both;
}
.drawer-top {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 10px;
  padding-bottom: 10px;
  border-bottom: 1px solid rgba(200, 223, 255, 0.12);
}
.drawer-title {
  margin: 0;
  font-weight: 900;
  letter-spacing: -0.03em;
}
.drawer-nav {
  display: grid;
  gap: 6px;
  padding: 12px 0;
}
.drawer-nav a {
  padding: 12px 12px;
  border-radius: 16px;
  border: 1px solid transparent;
  color: var(--muted);
}
.drawer-nav a:hover {
  background: rgba(255, 255, 255, 0.04);
  color: rgba(244, 249, 255, 0.92);
}
.drawer-link {
  display: inline-flex;
  padding: 12px 12px;
  border-radius: 16px;
  border: 1px solid rgba(200, 223, 255, 0.12);
  background: rgba(255, 255, 255, 0.04);
  color: rgba(244, 249, 255, 0.9);
}

/* Scroll reveal */
.reveal {
  opacity: 0;
  transform: translateY(10px);
  transition: opacity 600ms ease, transform 600ms ease;
  will-change: opacity, transform;
}
.reveal.is-visible {
  opacity: 1;
  transform: translateY(0);
}

/* Animations */
@keyframes float {
  0%,
  100% {
    transform: translateY(0);
  }
  50% {
    transform: translateY(-10px);
  }
}

@keyframes spin {
  to {
    transform: translate(-50%, -50%) rotate(360deg);
  }
}

@keyframes drawerIn {
  from {
    transform: translateX(-14px);
    opacity: 0.75;
  }
  to {
    transform: translateX(0);
    opacity: 1;
  }
}

/* Responsive */
@media (max-width: 1200px) {
  .content {
    grid-template-columns: 1fr;
  }
  .right {
    position: static;
    height: auto;
    padding: 0 18px 22px;
  }
  .right-inner {
    padding-right: 0;
    grid-template-columns: repeat(12, 1fr);
  }
  .right-card {
    grid-column: span 6;
  }
}

@media (max-width: 980px) {
  .app {
    grid-template-columns: 1fr;
  }
  .sidebar {
    display: none;
  }
  .mobile-menu {
    display: grid;
  }
  .topbar {
    grid-template-columns: 1fr;
  }
  .topbar-center {
    order: 3;
  }
  .topbar-right {
    order: 2;
    justify-content: space-between;
  }
  .hero-inner {
    grid-template-columns: 1fr;
  }
  .hero-glass-stack {
    justify-items: start;
  }
  .stat {
    grid-column: span 6;
  }
  .course {
    grid-template-columns: 1fr;
  }
  .course-right {
    justify-items: start;
    min-width: 0;
  }
  .progress {
    width: 100%;
  }
  .virtual-inner {
    grid-template-columns: 1fr;
  }
  .ai-card {
    grid-column: span 12;
  }
}

@media (max-width: 720px) {
  .main {
    padding: 14px 14px 22px;
  }
  .right-inner {
    grid-template-columns: 1fr;
  }
  .right-card {
    grid-column: auto;
  }
  .stat {
    grid-column: span 12;
  }
}

@media (prefers-reduced-motion: reduce) {
  html {
    scroll-behavior: auto;
  }
  .reveal {
    transition: none;
    opacity: 1;
    transform: none;
  }
  .btn,
  .nav-item,
  .stat,
  .course,
  .ai-card,
  .icon-btn,
  .user {
    transition: none !important;
  }
  .holo,
  .holo-ring {
    animation: none !important;
  }
}