:root {
  color-scheme: dark;
  --school-bg: #06030d;
  --school-panel: rgba(255, 255, 255, 0.06);
  --school-panel-strong: rgba(255, 255, 255, 0.1);
  --school-line: rgba(255, 255, 255, 0.12);
  --school-text: #fbf8ff;
  --school-muted: #b9afc8;
  --school-faint: #7d728e;
  --school-purple: #9b7bff;
  --school-pink: #d676ff;
  --school-green: #9ff5c8;
  --school-max: 1180px;
}

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

html,
body {
  margin: 0;
  min-height: 100%;
  overflow-x: hidden;
  background: var(--school-bg);
  color: var(--school-text);
  font-family: "DM Sans", ui-sans-serif, system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
}

body {
  background:
    radial-gradient(circle at 20% -10%, rgba(155, 123, 255, 0.34), transparent 34rem),
    radial-gradient(circle at 96% 16%, rgba(214, 118, 255, 0.18), transparent 30rem),
    linear-gradient(180deg, #090512 0%, #06030d 48%, #0d0718 100%);
}

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

button,
input,
select {
  font: inherit;
}

.school-shell {
  min-height: 100vh;
}

.school-topbar {
  position: sticky;
  top: 0;
  z-index: 30;
  border-bottom: 1px solid rgba(255, 255, 255, 0.08);
  background: rgba(6, 3, 13, 0.82);
  backdrop-filter: blur(20px);
}

.school-nav {
  width: min(var(--school-max), calc(100% - 32px));
  min-height: 74px;
  margin: 0 auto;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 20px;
}

.school-brand,
.school-links {
  display: flex;
  align-items: center;
  gap: 14px;
}

.school-brand {
  font-weight: 850;
  letter-spacing: 0;
}

.school-mark {
  display: grid;
  place-items: center;
  width: 38px;
  height: 38px;
  border-radius: 14px;
  background: linear-gradient(135deg, var(--school-purple), var(--school-pink));
  box-shadow: 0 18px 44px rgba(155, 123, 255, 0.34);
}

.school-links {
  color: var(--school-muted);
  font-size: 14px;
  font-weight: 750;
}

.school-links a:hover {
  color: var(--school-text);
}

.school-main {
  width: min(var(--school-max), calc(100% - 32px));
  margin: 0 auto;
  padding: 58px 0 90px;
}

.school-hero {
  display: grid;
  grid-template-columns: minmax(0, 0.9fr) minmax(320px, 0.7fr);
  gap: clamp(28px, 5vw, 64px);
  align-items: end;
  margin-bottom: 44px;
}

.school-kicker {
  margin: 0 0 16px;
  color: var(--school-purple);
  font: 800 12px/1.1 "DM Sans", ui-sans-serif, system-ui, sans-serif;
  letter-spacing: 0;
  text-transform: uppercase;
}

.school-hero h1,
.section-title {
  margin: 0;
  font-family: "Instrument Sans", "DM Sans", ui-sans-serif, system-ui, sans-serif;
  letter-spacing: 0;
  line-height: 0.96;
}

.school-hero h1 {
  max-width: 780px;
  font-size: clamp(48px, 7vw, 92px);
}

.school-hero h1 span,
.section-title span {
  color: transparent;
  background: linear-gradient(115deg, #fff, #cfc3ff 46%, var(--school-pink));
  -webkit-background-clip: text;
  background-clip: text;
}

.school-copy {
  max-width: 690px;
  margin: 24px 0 0;
  color: var(--school-muted);
  font-size: clamp(17px, 1.5vw, 20px);
  line-height: 1.58;
}

.school-actions,
.auth-tabs,
.plan-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  margin-top: 28px;
}

.button,
.button-secondary,
.button-ghost {
  min-height: 46px;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  border: 0;
  border-radius: 999px;
  padding: 0 20px;
  font-weight: 850;
  cursor: pointer;
}

.button {
  color: white;
  background: linear-gradient(135deg, #7c5cff, #c45cff);
  box-shadow: 0 18px 44px rgba(124, 92, 255, 0.35);
}

.button-secondary {
  color: var(--school-text);
  border: 1px solid var(--school-line);
  background: rgba(255, 255, 255, 0.08);
}

.button-ghost {
  color: #dfd7ff;
  border: 1px solid rgba(155, 123, 255, 0.28);
  background: rgba(155, 123, 255, 0.1);
}

.button[disabled] {
  cursor: not-allowed;
  opacity: 0.56;
}

.school-panel,
.auth-panel,
.plan,
.course-row,
.lesson-player,
.lesson-sidebar,
.locked-state {
  border: 1px solid var(--school-line);
  background: var(--school-panel);
  box-shadow: 0 30px 80px rgba(0, 0, 0, 0.22);
}

.school-panel,
.auth-panel {
  border-radius: 34px;
  padding: clamp(22px, 4vw, 44px);
}

.signal-list {
  display: grid;
  gap: 1px;
  overflow: hidden;
  border: 1px solid var(--school-line);
  border-radius: 26px;
  background: var(--school-line);
}

.signal-list div {
  display: grid;
  grid-template-columns: 94px 1fr;
  gap: 18px;
  padding: 18px;
  background: rgba(0, 0, 0, 0.24);
}

.signal-list strong {
  color: white;
}

.signal-list span {
  color: var(--school-muted);
  line-height: 1.45;
}

.auth-layout {
  display: grid;
  grid-template-columns: minmax(0, 0.84fr) minmax(320px, 0.58fr);
  gap: 28px;
  align-items: start;
}

.auth-tabs button {
  min-width: 122px;
}

.auth-form {
  display: grid;
  gap: 14px;
  margin-top: 24px;
}

.auth-form label,
.inline-field {
  display: grid;
  gap: 8px;
  color: var(--school-muted);
  font-size: 13px;
  font-weight: 750;
}

.auth-form input,
.inline-field input,
.inline-field select {
  width: 100%;
  border: 1px solid var(--school-line);
  border-radius: 16px;
  background: rgba(255, 255, 255, 0.08);
  color: var(--school-text);
  padding: 14px 15px;
  outline: none;
}

.auth-status,
.app-status {
  min-height: 22px;
  margin: 14px 0 0;
  color: var(--school-muted);
  line-height: 1.45;
}

.auth-status[data-state="error"],
.app-status[data-state="error"] {
  color: #ffc9d4;
}

.auth-status[data-state="success"],
.app-status[data-state="success"] {
  color: var(--school-green);
}

.section-head {
  display: flex;
  align-items: end;
  justify-content: space-between;
  gap: 22px;
  margin: 54px 0 22px;
}

.section-title {
  font-size: clamp(36px, 5.5vw, 70px);
}

.plans-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 14px;
}

.plan {
  border-radius: 28px;
  padding: 24px;
}

.plan small {
  color: var(--school-purple);
  font-weight: 850;
  letter-spacing: 0.08em;
  text-transform: uppercase;
}

.plan h3 {
  margin: 14px 0 8px;
  font-size: 25px;
  letter-spacing: -0.04em;
}

.plan-price {
  margin: 0 0 14px;
  font-size: 32px;
  font-weight: 900;
  letter-spacing: -0.04em;
}

.plan ul {
  margin: 0;
  padding-left: 18px;
  color: var(--school-muted);
  line-height: 1.8;
}

.courses-list {
  display: grid;
  gap: 14px;
}

.course-row {
  display: grid;
  grid-template-columns: minmax(0, 1fr) auto;
  gap: 22px;
  align-items: center;
  border-radius: 28px;
  padding: 22px;
}

.course-row h3 {
  margin: 0;
  font-size: clamp(24px, 3vw, 36px);
  letter-spacing: -0.045em;
}

.course-meta {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
  margin-top: 14px;
}

.pill {
  display: inline-flex;
  align-items: center;
  min-height: 32px;
  border-radius: 999px;
  padding: 0 12px;
  color: #ded6ff;
  background: rgba(155, 123, 255, 0.12);
  border: 1px solid rgba(155, 123, 255, 0.22);
  font-size: 12px;
  font-weight: 800;
}

.course-app {
  display: grid;
  grid-template-columns: minmax(280px, 0.36fr) minmax(0, 1fr);
  gap: 18px;
  align-items: start;
}

.lesson-sidebar,
.lesson-player,
.locked-state {
  border-radius: 30px;
}

.lesson-sidebar {
  position: sticky;
  top: 94px;
  padding: 18px;
}

.module-title {
  margin: 18px 0 10px;
  color: var(--school-purple);
  font-size: 12px;
  font-weight: 850;
  letter-spacing: 0.12em;
  text-transform: uppercase;
}

.module-title:first-child {
  margin-top: 0;
}

.lesson-link {
  width: 100%;
  display: grid;
  grid-template-columns: 1fr auto;
  gap: 12px;
  align-items: center;
  border: 0;
  border-radius: 16px;
  margin: 6px 0;
  padding: 13px;
  color: var(--school-text);
  background: rgba(255, 255, 255, 0.055);
  text-align: left;
  cursor: pointer;
}

.lesson-link[aria-current="true"] {
  background: rgba(155, 123, 255, 0.2);
  outline: 1px solid rgba(155, 123, 255, 0.42);
}

.lesson-link small {
  display: block;
  margin-top: 5px;
  color: var(--school-faint);
}

.lesson-player {
  overflow: hidden;
  background: rgba(0, 0, 0, 0.2);
}

.video-frame {
  aspect-ratio: 16 / 9;
  background: #05020a;
}

.video-frame iframe {
  width: 100%;
  height: 100%;
  border: 0;
  display: block;
}

.video-placeholder {
  width: 100%;
  height: 100%;
  min-height: 320px;
  display: grid;
  place-items: center;
  align-content: center;
  gap: 12px;
  padding: 34px;
  text-align: center;
  background:
    radial-gradient(circle at 50% 0%, rgba(155, 123, 255, 0.28), transparent 24rem),
    linear-gradient(135deg, rgba(255, 255, 255, 0.08), rgba(255, 255, 255, 0.03));
}

.video-placeholder strong {
  display: block;
  max-width: 620px;
  font-size: clamp(28px, 4vw, 56px);
  line-height: 0.98;
  letter-spacing: -0.05em;
}

.video-placeholder span {
  max-width: 560px;
  color: var(--school-muted);
  line-height: 1.6;
}

.lesson-body {
  padding: clamp(22px, 4vw, 40px);
}

.lesson-body h1 {
  margin: 0;
  font-size: clamp(34px, 5vw, 64px);
  line-height: 0.98;
  letter-spacing: -0.055em;
}

.lesson-body p {
  color: var(--school-muted);
  font-size: 17px;
  line-height: 1.7;
}

.resource-list {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
  margin: 24px 0;
}

.locked-state {
  padding: clamp(26px, 6vw, 64px);
  text-align: center;
}

.locked-state h1 {
  margin: 0 auto 16px;
  max-width: 720px;
  font-size: clamp(38px, 7vw, 82px);
  line-height: 0.96;
  letter-spacing: -0.055em;
}

.locked-state p {
  max-width: 620px;
  margin: 0 auto;
  color: var(--school-muted);
  font-size: 18px;
  line-height: 1.65;
}

.hidden {
  display: none !important;
}

@media (max-width: 920px) {
  .school-nav,
  .school-links,
  .school-hero,
  .auth-layout,
  .course-app,
  .course-row,
  .section-head {
    display: grid;
    grid-template-columns: 1fr;
  }

  .school-nav {
    padding: 16px 0;
  }

  .school-links {
    gap: 10px;
  }

  .school-hero h1 {
    font-size: clamp(42px, 13vw, 62px);
  }

  .plans-grid {
    grid-template-columns: 1fr;
  }

  .lesson-sidebar {
    position: static;
  }

  .signal-list div {
    grid-template-columns: 1fr;
  }
}