:root {
  --bg: #07111a;
  --bg-deep: #050c13;
  --surface: #0b1722;
  --surface-raised: #0e1c29;
  --surface-soft: #112231;
  --border: #243746;
  --border-strong: #315066;
  --text: #f3f7fa;
  --text-muted: #a7b2be;
  --text-faint: #738392;
  --accent: #22b8e6;
  --accent-bright: #49caef;
  --accent-soft: rgba(34, 184, 230, 0.13);
  --success: #58d66b;
  --danger: #ff7184;
  --player: #000;
  --radius-sm: 8px;
  --radius-md: 12px;
  --radius-lg: 16px;
  --shadow-card: 0 24px 72px rgba(0, 0, 0, 0.28);
  --transition-fast: 140ms ease;
  --transition-base: 220ms ease;
}

* {
  box-sizing: border-box;
}

[hidden] {
  display: none !important;
}

.svg-sprite {
  position: absolute;
  width: 0;
  height: 0;
  overflow: hidden;
  pointer-events: none;
}

.field-group input[aria-invalid="true"] {
  border-color: rgba(255, 113, 132, 0.72);
  box-shadow: 0 0 0 3px rgba(255, 113, 132, 0.08);
}

html {
  min-width: 320px;
  background: var(--bg);
  color-scheme: dark;
}

body {
  min-height: 100vh;
  margin: 0;
  background: var(--bg);
  color: var(--text);
  font-family: Inter, ui-sans-serif, system-ui, -apple-system,
    BlinkMacSystemFont, "Segoe UI", sans-serif;
  -webkit-font-smoothing: antialiased;
  text-rendering: optimizeLegibility;
}

button,
input,
select {
  font: inherit;
}

button,
summary {
  -webkit-tap-highlight-color: transparent;
}

button:focus-visible,
input:focus-visible,
select:focus-visible,
summary:focus-visible,
[tabindex]:focus-visible {
  outline: 3px solid rgba(140, 233, 250, 0.48);
  outline-offset: 3px;
}

button:disabled {
  cursor: not-allowed;
}

.brand {
  display: inline-flex;
  align-items: center;
  gap: 12px;
  min-width: max-content;
}

.brand__mark {
  display: grid;
  width: 42px;
  height: 42px;
  place-items: center;
  color: var(--accent);
}

.brand__mark svg {
  width: 100%;
  height: 100%;
  filter: drop-shadow(0 0 8px rgba(34, 184, 230, 0.2));
}

.brand__name {
  color: var(--text);
  font-size: 22px;
  font-weight: 720;
  letter-spacing: -0.035em;
}

.brand__name span {
  color: var(--accent);
}

.brand--compact {
  gap: 9px;
}

.brand--compact .brand__mark {
  width: 34px;
  height: 34px;
}

.brand--compact .brand__name {
  font-size: 19px;
}

.primary-button {
  display: inline-flex;
  min-height: 48px;
  align-items: center;
  justify-content: center;
  gap: 10px;
  border: 1px solid #31bce6;
  border-radius: var(--radius-sm);
  background: var(--accent);
  color: #03111a;
  font-size: 15px;
  font-weight: 720;
  letter-spacing: -0.01em;
  box-shadow: 0 10px 30px rgba(34, 184, 230, 0.12);
  cursor: pointer;
  transition:
    background var(--transition-fast),
    transform var(--transition-fast),
    box-shadow var(--transition-fast);
}

.primary-button:hover:not(:disabled) {
  background: var(--accent-bright);
  box-shadow: 0 14px 34px rgba(34, 184, 230, 0.2);
  transform: translateY(-1px);
}

.primary-button:active:not(:disabled) {
  transform: translateY(0);
}

.primary-button:disabled {
  border-color: var(--border);
  background: #172938;
  color: #7f909f;
  box-shadow: none;
}

.icon-button {
  display: inline-grid;
  width: 42px;
  height: 42px;
  place-items: center;
  border: 1px solid var(--border);
  border-radius: var(--radius-sm);
  background: var(--surface-raised);
  color: var(--text-muted);
  cursor: pointer;
  transition:
    border-color var(--transition-fast),
    color var(--transition-fast),
    background var(--transition-fast);
}

.icon-button:hover:not(:disabled) {
  border-color: var(--border-strong);
  background: var(--surface-soft);
  color: var(--text);
}

.icon-button svg {
  width: 20px;
  height: 20px;
}

/* Login */

.login-page {
  position: relative;
  display: grid;
  min-height: 100svh;
  place-items: center;
  overflow: hidden;
  padding: 32px;
  background: var(--bg-deep);
}

.login-ambient {
  position: absolute;
  inset: 0;
  pointer-events: none;
  background:
    linear-gradient(rgba(34, 184, 230, 0.025) 1px, transparent 1px),
    linear-gradient(90deg, rgba(34, 184, 230, 0.025) 1px, transparent 1px);
  background-size: 48px 48px;
  mask-image: linear-gradient(to right, transparent, #000 60%, transparent);
}

.login-layout {
  position: relative;
  z-index: 1;
  display: grid;
  width: min(100%, 1040px);
  grid-template-columns: minmax(360px, 440px) minmax(0, 1fr);
  overflow: hidden;
  border: 1px solid var(--border);
  border-radius: var(--radius-lg);
  background: var(--surface);
  box-shadow: var(--shadow-card);
}

.login-card {
  display: flex;
  min-height: 640px;
  flex-direction: column;
  padding: 46px 48px 34px;
  border-right: 1px solid var(--border);
  background: var(--surface);
}

.login-card__heading {
  margin-top: 48px;
}

.login-card__heading h1 {
  margin: 0;
  color: var(--text);
  font-size: clamp(26px, 2.4vw, 32px);
  font-weight: 700;
  letter-spacing: -0.035em;
  line-height: 1.2;
}

.login-card__heading p {
  margin: 14px 0 0;
  color: var(--text-muted);
  font-size: 14px;
  line-height: 1.65;
}

.login-form {
  display: grid;
  gap: 20px;
  margin-top: 32px;
}

.field-group {
  display: grid;
  gap: 8px;
}

.field-group label {
  color: #c5d0da;
  font-size: 13px;
  font-weight: 620;
}

.field-group input {
  width: 100%;
  height: 48px;
  border: 1px solid var(--border);
  border-radius: var(--radius-sm);
  background: #0a1520;
  color: var(--text);
  font-size: 15px;
  padding: 0 14px;
  transition:
    border-color var(--transition-fast),
    box-shadow var(--transition-fast),
    background var(--transition-fast);
}

.field-group input::placeholder {
  color: #657483;
}

.field-group input:hover {
  border-color: #345065;
}

.field-group input:focus {
  border-color: var(--accent);
  background: #0b1824;
  box-shadow: 0 0 0 3px rgba(34, 184, 230, 0.11);
  outline: none;
}

.field-group input[aria-invalid="true"] {
  border-color: var(--danger);
}

.password-field {
  position: relative;
}

.password-field input {
  padding-right: 48px;
}

.password-toggle {
  position: absolute;
  top: 50%;
  right: 4px;
  display: grid;
  width: 40px;
  height: 40px;
  place-items: center;
  border: 0;
  border-radius: 6px;
  background: transparent;
  color: var(--text-muted);
  cursor: pointer;
}

.password-toggle:hover {
  color: var(--text);
}

.password-toggle svg {
  width: 19px;
  height: 19px;
}

.field-error {
  color: var(--danger);
  font-size: 12px;
  line-height: 1.35;
}

.form-error,
.status-message {
  border: 1px solid rgba(255, 113, 132, 0.32);
  border-radius: var(--radius-sm);
  background: rgba(255, 113, 132, 0.08);
  color: #ffabb7;
  font-size: 13px;
  line-height: 1.5;
  padding: 11px 13px;
}

.status-message {
  display: flex;
  align-items: center;
  gap: 9px;
  margin-top: 22px;
}

.status-message svg {
  width: 17px;
  height: 17px;
  flex: 0 0 auto;
}

.status-message--success {
  border-color: rgba(88, 214, 107, 0.3);
  background: rgba(88, 214, 107, 0.08);
  color: #9ce8a7;
}

.login-submit {
  width: 100%;
  margin-top: 4px;
}

.button-spinner {
  width: 16px;
  height: 16px;
  border: 2px solid rgba(3, 17, 26, 0.28);
  border-top-color: #03111a;
  border-radius: 50%;
  animation: spin 800ms linear infinite;
}

.login-help {
  margin: 15px 0 0;
  color: var(--text-faint);
  font-size: 12px;
  line-height: 1.5;
  text-align: center;
}

.login-card__footer {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  margin-top: auto;
  padding-top: 28px;
  color: var(--text-muted);
  font-size: 12px;
}

.login-card__footer svg {
  width: 16px;
  height: 16px;
  color: var(--accent);
}

.login-proof {
  display: flex;
  min-width: 0;
  flex-direction: column;
  justify-content: center;
  padding: 54px 58px;
  background: #08131d;
}

.login-proof__visual {
  position: relative;
  display: grid;
  height: 210px;
  place-items: center;
  overflow: hidden;
  border: 1px solid var(--border);
  border-radius: var(--radius-md);
  background: #050d14;
}

.proof-shield {
  width: 94px;
  height: 94px;
  color: #315267;
}

.proof-shield svg {
  width: 100%;
  height: 100%;
}

.proof-watermark {
  position: absolute;
  right: 9%;
  bottom: 18%;
  color: rgba(255, 255, 255, 0.2);
  font-size: 36px;
  font-style: italic;
  font-weight: 520;
  letter-spacing: -0.04em;
  transform: rotate(-7deg);
  user-select: none;
}

.login-proof__copy {
  margin-top: 30px;
}

.login-proof__copy h2 {
  margin: 0;
  color: var(--text);
  font-size: 23px;
  font-weight: 680;
  letter-spacing: -0.03em;
}

.login-proof__copy p {
  margin: 11px 0 0;
  color: var(--text-muted);
  font-size: 14px;
  line-height: 1.65;
}

.proof-list {
  display: grid;
  gap: 17px;
  margin: 28px 0 0;
  padding: 0;
  list-style: none;
}

.proof-list li {
  display: grid;
  grid-template-columns: 24px minmax(0, 1fr);
  align-items: start;
  gap: 12px;
  color: var(--text-muted);
  font-size: 12px;
  line-height: 1.45;
}

.proof-list > li > svg {
  width: 21px;
  height: 21px;
  color: var(--accent);
}

.proof-list span {
  display: grid;
  gap: 2px;
}

.proof-list strong {
  color: #dce5eb;
  font-size: 13px;
  font-weight: 640;
}

/* Portal shell */

.portal-page {
  min-height: 100svh;
  background: var(--bg);
}

.portal-header {
  position: sticky;
  z-index: 40;
  top: 0;
  display: grid;
  min-height: 72px;
  grid-template-columns: auto minmax(0, 1fr) auto;
  align-items: center;
  gap: 30px;
  padding: 0 28px;
  border-bottom: 1px solid var(--border);
  background: rgba(7, 17, 26, 0.96);
  backdrop-filter: blur(18px);
}

.portal-breadcrumb {
  display: flex;
  min-width: 0;
  align-items: center;
  gap: 10px;
  padding-left: 28px;
  border-left: 1px solid var(--border);
  color: var(--text-faint);
  font-size: 13px;
  white-space: nowrap;
}

.portal-breadcrumb strong {
  overflow: hidden;
  color: #dce4ea;
  font-weight: 620;
  text-overflow: ellipsis;
}

.portal-account {
  display: flex;
  align-items: center;
  gap: 10px;
}

.session-pill,
.user-pill,
.access-state {
  display: inline-flex;
  height: 42px;
  align-items: center;
  gap: 9px;
  border: 1px solid var(--border);
  border-radius: var(--radius-sm);
  background: var(--surface);
  color: var(--text-muted);
  font-size: 12px;
  font-weight: 580;
  padding: 0 13px;
}

.session-pill svg,
.user-pill svg,
.access-state svg {
  width: 18px;
  height: 18px;
  color: var(--accent);
}

.session-pill i {
  width: 6px;
  height: 6px;
  border-radius: 50%;
  background: var(--success);
  box-shadow: 0 0 0 3px rgba(88, 214, 107, 0.1);
}

.user-pill {
  color: var(--text);
}

.portal-workspace {
  display: grid;
  min-height: calc(100svh - 72px);
  grid-template-columns: 256px minmax(0, 1fr);
}

.lesson-rail {
  position: sticky;
  top: 72px;
  display: flex;
  height: calc(100svh - 72px);
  flex-direction: column;
  padding: 22px 14px;
  border-right: 1px solid var(--border);
  background: #08141e;
}

.lesson-rail__heading {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 0 8px 16px;
  color: #dbe5eb;
  font-size: 13px;
  font-weight: 650;
}

.lesson-rail__heading small {
  color: var(--text-faint);
  font-size: 11px;
  font-weight: 520;
}

.lesson-item {
  position: relative;
  display: grid;
  grid-template-columns: 32px minmax(0, 1fr);
  gap: 10px;
  overflow: hidden;
  margin-bottom: 10px;
  padding: 13px 12px;
  border: 1px solid var(--border);
  border-radius: var(--radius-sm);
  background: rgba(255, 255, 255, 0.015);
  color: inherit;
  text-decoration: none;
  transition: border-color 160ms ease, background 160ms ease, transform 160ms ease;
}

.lesson-item:hover,
.lesson-item:focus-visible {
  border-color: rgba(73, 202, 239, 0.55);
  background: rgba(73, 202, 239, 0.07);
  outline: none;
  transform: translateY(-1px);
}

.lesson-item--active {
  border-color: var(--accent);
  background: var(--accent-soft);
}

.lesson-item::before {
  position: absolute;
  inset: 0 auto 0 0;
  width: 3px;
  background: var(--border);
  content: "";
}

.lesson-item--active::before {
  background: var(--accent);
}

.lesson-item__play {
  display: grid;
  width: 30px;
  height: 30px;
  place-items: center;
  border: 1px solid rgba(73, 202, 239, 0.55);
  border-radius: 50%;
  color: var(--accent-bright);
}

.lesson-item__play svg {
  width: 15px;
  height: 15px;
}

.lesson-item__copy {
  display: grid;
  min-width: 0;
  gap: 2px;
}

.lesson-item__copy small {
  color: var(--text-faint);
  font-size: 10px;
  font-weight: 650;
  letter-spacing: 0.08em;
  text-transform: uppercase;
}

.lesson-item__copy strong {
  overflow: hidden;
  color: var(--text);
  font-size: 13px;
  font-weight: 630;
  text-overflow: ellipsis;
  white-space: nowrap;
}

.lesson-item__copy em {
  color: var(--success);
  font-size: 10px;
  font-style: normal;
}

.rail-note {
  display: grid;
  grid-template-columns: 20px minmax(0, 1fr);
  gap: 10px;
  margin-top: auto;
  padding: 15px 10px 4px;
  color: var(--text-faint);
}

.rail-note svg {
  width: 18px;
  height: 18px;
  color: #527187;
}

.rail-note p {
  margin: 0;
  font-size: 11px;
  line-height: 1.55;
}

.lesson-main {
  width: min(100%, 1260px);
  margin: 0 auto;
  padding: 34px 34px 56px;
}

.lesson-heading {
  display: flex;
  align-items: flex-end;
  justify-content: space-between;
  gap: 24px;
  margin-bottom: 24px;
}

.lesson-heading p,
.lesson-summary p {
  margin: 0 0 7px;
  color: var(--accent);
  font-size: 11px;
  font-weight: 700;
  letter-spacing: 0.08em;
  text-transform: uppercase;
}

.lesson-heading h1 {
  margin: 0;
  color: var(--text);
  font-size: clamp(26px, 3vw, 34px);
  font-weight: 700;
  letter-spacing: -0.04em;
  line-height: 1.15;
}

.lesson-heading > div > span {
  display: block;
  margin-top: 8px;
  color: var(--text-muted);
  font-size: 13px;
}

.access-state {
  height: 38px;
  border-color: rgba(88, 214, 107, 0.24);
  background: rgba(88, 214, 107, 0.06);
  color: #b9eec1;
  white-space: nowrap;
}

.access-state svg {
  color: var(--success);
}

.player-frame {
  position: relative;
  overflow: hidden;
  aspect-ratio: 16 / 9;
  border: 1px solid #263b4b;
  border-radius: var(--radius-md);
  background: var(--player);
  box-shadow: 0 18px 48px rgba(0, 0, 0, 0.2);
}

.player-frame--preparing {
  background: #050a0f;
}

.player-preparing {
  position: absolute;
  inset: 0;
  display: flex;
  align-items: center;
  justify-content: center;
  flex-direction: column;
  gap: 9px;
  padding-bottom: 58px;
  text-align: center;
}

.player-preparing__mark {
  width: 72px;
  height: 72px;
  margin-bottom: 5px;
  color: #254153;
}

.player-preparing__mark svg {
  width: 100%;
  height: 100%;
}

.player-preparing strong {
  color: #d8e2e9;
  font-size: 17px;
  font-weight: 640;
}

.player-preparing > span:last-child {
  color: var(--text-faint);
  font-size: 12px;
}

.preview-watermark {
  position: absolute;
  z-index: 2;
  top: 22%;
  right: 12%;
  color: rgba(255, 255, 255, 0.22);
  font-size: clamp(17px, 2vw, 30px);
  font-style: italic;
  font-weight: 540;
  text-shadow: 0 2px 8px #000;
  transform: rotate(-6deg);
  user-select: none;
}

.preview-controls {
  position: absolute;
  z-index: 3;
  inset: auto 0 0;
  display: grid;
  height: 58px;
  grid-template-columns: 34px auto minmax(80px, 1fr) auto;
  align-items: center;
  gap: 14px;
  padding: 0 18px;
  border-top: 1px solid #1b2934;
  background: #030507;
  color: var(--text-muted);
  font-size: 11px;
}

.preview-play {
  display: grid;
  place-items: center;
  color: white;
}

.preview-play svg {
  width: 21px;
  height: 21px;
}

.preview-track {
  position: relative;
  height: 3px;
  overflow: hidden;
  border-radius: 999px;
  background: #33434f;
}

.preview-track i {
  display: block;
  width: 0;
  height: 100%;
  background: var(--accent);
}

.preview-quality {
  color: #d8e2e9;
}

/* Protected video player */

.secure-player {
  isolation: isolate;
  user-select: none;
  -webkit-user-select: none;
  touch-action: manipulation;
}

.secure-player-host {
  position: absolute;
  z-index: 1;
  inset: 0;
  width: 100%;
  height: 100%;
  overflow: hidden;
}

.player-interaction-shield {
  position: absolute;
  z-index: 2;
  inset: 0;
  cursor: default;
}

.player-state {
  position: absolute;
  z-index: 6;
  inset: 0;
  display: flex;
  align-items: center;
  justify-content: center;
  flex-direction: column;
  gap: 9px;
  padding: 28px 28px 74px;
  background: #050a0f;
  text-align: center;
}

.player-state strong {
  color: var(--text);
  font-size: 16px;
  font-weight: 650;
}

.player-state > span:not(.player-spinner):not(.player-state__mark):not(.security-lock__mark) {
  max-width: 420px;
  color: var(--text-muted);
  font-size: 12px;
  line-height: 1.5;
}

.player-state__mark {
  width: 62px;
  height: 62px;
  margin-bottom: 3px;
  color: #325267;
}

.player-state__mark svg {
  width: 100%;
  height: 100%;
}

.player-state button {
  min-height: 40px;
  margin-top: 7px;
  border: 1px solid var(--accent);
  border-radius: var(--radius-sm);
  background: var(--accent-soft);
  color: var(--accent-bright);
  font-size: 13px;
  font-weight: 650;
  padding: 0 17px;
  cursor: pointer;
}

.player-state--gated {
  background:
    radial-gradient(circle at 50% 32%, rgba(34, 184, 230, 0.08), transparent 34%),
    #050a0f;
}

.player-state--security {
  z-index: 14;
  padding-bottom: 28px;
  background: #050a0f;
  outline: none;
}

.player-state--security > strong {
  color: #f3f7fa;
  font-size: 18px;
  font-weight: 700;
}

.player-state--security > span:not(.security-lock__mark) {
  max-width: 480px;
  color: #a7b2be;
  font-size: 13px;
  line-height: 1.55;
}

.player-state--security > small {
  color: #9ce8a7;
  font-size: 12px;
  font-weight: 620;
}

.security-lock__mark {
  display: grid;
  width: 52px;
  height: 52px;
  margin-bottom: 3px;
  place-items: center;
  border: 1px solid rgba(243, 197, 107, 0.3);
  border-radius: 50%;
  background: rgba(243, 197, 107, 0.09);
  color: #f3c56b;
}

.security-lock__mark svg {
  width: 30px;
  height: 30px;
}

.secure-player--security-locked .player-controls,
.secure-player--security-locked .center-play-button,
.secure-player--security-locked .player-interaction-shield {
  display: none;
}

.player-spinner {
  width: 28px;
  height: 28px;
  border: 2px solid rgba(34, 184, 230, 0.2);
  border-top-color: var(--accent);
  border-radius: 50%;
  animation: spin 850ms linear infinite;
}

.buffering-indicator {
  position: absolute;
  z-index: 6;
  top: 50%;
  left: 50%;
  display: grid;
  width: 54px;
  height: 54px;
  place-items: center;
  border: 1px solid rgba(255, 255, 255, 0.14);
  border-radius: 50%;
  background: rgba(0, 0, 0, 0.72);
  pointer-events: none;
  transform: translate(-50%, -50%);
}

.buffering-indicator .player-spinner {
  width: 26px;
  height: 26px;
}

.center-play-button {
  position: absolute;
  z-index: 6;
  top: 50%;
  left: 50%;
  display: inline-flex;
  min-height: 52px;
  align-items: center;
  gap: 10px;
  border: 1px solid rgba(255, 255, 255, 0.28);
  border-radius: 999px;
  background: rgba(3, 8, 12, 0.84);
  color: #fff;
  font-size: 13px;
  font-weight: 650;
  padding: 0 20px 0 16px;
  box-shadow: 0 12px 38px rgba(0, 0, 0, 0.4);
  cursor: pointer;
  transform: translate(-50%, -50%);
  transition:
    background var(--transition-fast),
    transform var(--transition-fast),
    border-color var(--transition-fast);
}

.center-play-button:hover {
  border-color: var(--accent);
  background: rgba(4, 20, 29, 0.94);
  transform: translate(-50%, -50%) scale(1.025);
}

.center-play-button svg {
  width: 24px;
  height: 24px;
  color: var(--accent-bright);
}

.skip-notice {
  position: absolute;
  z-index: 8;
  top: 50%;
  left: 50%;
  border: 1px solid rgba(255, 255, 255, 0.2);
  border-radius: 999px;
  background: rgba(0, 0, 0, 0.76);
  color: #fff;
  font-size: 13px;
  font-weight: 650;
  padding: 9px 14px;
  pointer-events: none;
  transform: translate(-50%, -50%);
}

.context-toast {
  position: absolute;
  z-index: 10;
  top: 16px;
  left: 50%;
  width: max-content;
  max-width: calc(100% - 32px);
  border: 1px solid rgba(34, 184, 230, 0.34);
  border-radius: var(--radius-sm);
  background: rgba(5, 17, 25, 0.94);
  color: #c8eefa;
  font-size: 12px;
  line-height: 1.4;
  padding: 9px 12px;
  pointer-events: none;
  text-align: center;
  transform: translateX(-50%);
}

.player-controls {
  position: absolute;
  z-index: 9;
  inset: auto 0 0;
  display: grid;
  gap: 7px;
  padding: 28px 16px 12px;
  background: linear-gradient(to bottom, transparent, rgba(0, 0, 0, 0.94) 46%);
  opacity: 0;
  pointer-events: none;
  transform: translateY(8px);
  transition:
    opacity var(--transition-base),
    transform var(--transition-base);
}

.secure-player--controls-visible .player-controls {
  opacity: 1;
  pointer-events: auto;
  transform: translateY(0);
}

.seek-slider,
.volume-control input {
  height: 16px;
  margin: 0;
  appearance: none;
  -webkit-appearance: none;
  background: transparent;
  cursor: pointer;
}

.seek-slider {
  width: 100%;
}

.seek-slider::-webkit-slider-runnable-track,
.volume-control input::-webkit-slider-runnable-track {
  height: 4px;
  border-radius: 999px;
  background: linear-gradient(
    to right,
    var(--accent) 0 var(--seek-position, 0%),
    rgba(255, 255, 255, 0.31) var(--seek-position, 0%) 100%
  );
}

.volume-control input::-webkit-slider-runnable-track {
  height: 3px;
  background: linear-gradient(
    to right,
    var(--accent) 0 var(--volume-position, 0%),
    rgba(255, 255, 255, 0.26) var(--volume-position, 0%) 100%
  );
}

.seek-slider::-moz-range-track,
.volume-control input::-moz-range-track {
  height: 4px;
  border-radius: 999px;
  background: rgba(255, 255, 255, 0.31);
}

.seek-slider::-moz-range-progress,
.volume-control input::-moz-range-progress {
  height: 4px;
  border-radius: 999px;
  background: var(--accent);
}

.volume-control input::-moz-range-track,
.volume-control input::-moz-range-progress {
  height: 3px;
}

.seek-slider::-webkit-slider-thumb,
.volume-control input::-webkit-slider-thumb {
  width: 13px;
  height: 13px;
  margin-top: -4.5px;
  appearance: none;
  -webkit-appearance: none;
  border: 2px solid #fff;
  border-radius: 50%;
  background: var(--accent);
  box-shadow: 0 1px 5px rgba(0, 0, 0, 0.45);
}

.volume-control input::-webkit-slider-thumb {
  width: 11px;
  height: 11px;
  margin-top: -4px;
}

.seek-slider::-moz-range-thumb,
.volume-control input::-moz-range-thumb {
  width: 11px;
  height: 11px;
  border: 2px solid #fff;
  border-radius: 50%;
  background: var(--accent);
}

.control-row {
  display: flex;
  min-width: 0;
  align-items: center;
  justify-content: space-between;
  gap: 16px;
}

.control-row__primary,
.control-row__secondary,
.volume-control {
  display: flex;
  min-width: 0;
  align-items: center;
  gap: 5px;
}

.control-row button {
  display: grid;
  width: 38px;
  height: 38px;
  flex: 0 0 auto;
  place-items: center;
  border: 0;
  border-radius: 7px;
  background: transparent;
  color: #f5f8fa;
  cursor: pointer;
  transition:
    background var(--transition-fast),
    color var(--transition-fast);
}

.control-row button:hover:not(:disabled) {
  background: rgba(255, 255, 255, 0.12);
  color: var(--accent-bright);
}

.control-row button:disabled {
  color: #5f6b74;
}

.control-row button svg {
  width: 22px;
  height: 22px;
}

.player-time {
  margin-left: 5px;
  color: #e7edf1;
  font-size: 11px;
  font-variant-numeric: tabular-nums;
  white-space: nowrap;
}

.player-time i {
  color: #6d7b85;
  font-style: normal;
}

.volume-control input {
  width: 76px;
}

.rate-control select {
  height: 34px;
  border: 1px solid transparent;
  border-radius: 7px;
  background: rgba(255, 255, 255, 0.07);
  color: #eef3f6;
  font-size: 11px;
  font-weight: 600;
  padding: 0 7px;
  cursor: pointer;
}

.rate-control select:hover {
  border-color: rgba(255, 255, 255, 0.16);
}

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

.secure-player:fullscreen {
  width: 100vw;
  height: 100vh;
  aspect-ratio: auto;
  border: 0;
  border-radius: 0;
}

.lesson-summary {
  display: grid;
  grid-template-columns: minmax(0, 1fr) auto;
  align-items: center;
  gap: 20px 30px;
  margin-top: 18px;
  padding: 20px 22px;
  border: 1px solid var(--border);
  border-radius: var(--radius-md);
  background: var(--surface);
}

.lesson-summary h2 {
  margin: 0;
  color: var(--text);
  font-size: clamp(18px, 2vw, 23px);
  font-weight: 660;
  letter-spacing: -0.025em;
  line-height: 1.32;
}

.lesson-summary > div > span {
  display: block;
  margin-top: 8px;
  color: var(--text-muted);
  font-size: 12px;
}

.summary-action {
  min-width: 170px;
  padding: 0 20px;
}

.watch-progress {
  position: relative;
  grid-column: 1 / -1;
  height: 5px;
  overflow: hidden;
  border-radius: 999px;
  background: #263745;
}

.watch-progress i {
  display: block;
  width: 0;
  height: 100%;
  background: var(--accent);
}

.watch-progress--segmented {
  overflow: visible;
}

.watch-progress--segmented i {
  position: absolute;
  top: 0;
  bottom: 0;
  min-width: 2px;
  border-radius: 999px;
}

.watch-progress--segmented b {
  position: absolute;
  top: 50%;
  width: 2px;
  height: 11px;
  border-radius: 2px;
  background: #fff;
  box-shadow: 0 0 0 2px rgba(0, 0, 0, 0.28);
  transform: translate(-1px, -50%);
}

.security-strip {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 12px;
  margin-top: 18px;
}

.security-strip article {
  display: grid;
  min-width: 0;
  grid-template-columns: 38px minmax(0, 1fr);
  align-items: start;
  gap: 12px;
  padding: 16px;
  border: 1px solid var(--border);
  border-radius: var(--radius-sm);
  background: #091620;
}

.security-strip article > span {
  display: grid;
  width: 36px;
  height: 36px;
  place-items: center;
  border-radius: var(--radius-sm);
  background: var(--accent-soft);
  color: var(--accent);
}

.security-strip article > span svg {
  width: 20px;
  height: 20px;
}

.security-strip strong {
  display: block;
  overflow: hidden;
  color: #dce5eb;
  font-size: 12px;
  font-weight: 640;
  line-height: 1.35;
  text-overflow: ellipsis;
}

.security-strip p {
  margin: 5px 0 0;
  color: var(--text-faint);
  font-size: 11px;
  line-height: 1.45;
}

.protection-note {
  margin-top: 18px;
  border: 1px solid var(--border);
  border-radius: var(--radius-sm);
  background: var(--surface);
}

.protection-note summary {
  display: grid;
  min-height: 54px;
  grid-template-columns: 20px minmax(0, 1fr) auto;
  align-items: center;
  gap: 10px;
  padding: 0 16px;
  color: #dce5eb;
  cursor: pointer;
  list-style: none;
}

.protection-note summary::-webkit-details-marker {
  display: none;
}

.protection-note summary svg {
  width: 19px;
  height: 19px;
  color: var(--accent);
}

.protection-note summary span {
  font-size: 13px;
  font-weight: 620;
}

.protection-note summary em {
  color: var(--success);
  font-size: 11px;
  font-style: normal;
}

.protection-note p {
  margin: 0;
  padding: 0 16px 17px 46px;
  color: var(--text-muted);
  font-size: 12px;
  line-height: 1.65;
}

@keyframes spin {
  to {
    transform: rotate(360deg);
  }
}

@media (max-width: 980px) {
  .login-layout {
    width: min(100%, 500px);
    grid-template-columns: 1fr;
  }

  .login-card {
    min-height: 620px;
    border-right: 0;
  }

  .login-proof {
    display: none;
  }

  .session-pill {
    display: none;
  }

  .portal-workspace {
    grid-template-columns: 1fr;
  }

  .lesson-rail {
    position: static;
    display: block;
    height: auto;
    padding: 14px 24px;
    border-right: 0;
    border-bottom: 1px solid var(--border);
  }

  .lesson-rail__heading,
  .rail-note {
    display: none;
  }

  .lesson-item {
    max-width: 420px;
  }
}

@media (max-width: 720px) {
  .login-page {
    display: block;
    padding: 0;
    background: var(--surface);
  }

  .login-ambient {
    display: none;
  }

  .login-layout {
    width: 100%;
    min-height: 100svh;
    border: 0;
    border-radius: 0;
    box-shadow: none;
  }

  .login-card {
    min-height: 100svh;
    padding: 32px 22px 26px;
  }

  .login-card__heading {
    margin-top: 48px;
  }

  .login-card__heading h1 {
    font-size: 27px;
  }

  .portal-header {
    min-height: 64px;
    grid-template-columns: auto 1fr auto;
    gap: 10px;
    padding: 0 14px;
  }

  .portal-header .brand__name,
  .portal-breadcrumb,
  .user-pill svg {
    display: none;
  }

  .user-pill {
    height: 40px;
    border: 0;
    background: transparent;
    padding: 0 4px;
  }

  .logout-button {
    width: 40px;
    height: 40px;
  }

  .portal-workspace {
    min-height: calc(100svh - 64px);
  }

  .lesson-rail {
    padding: 12px 14px;
  }

  .lesson-main {
    padding: 24px 14px 42px;
  }

  .lesson-heading {
    align-items: flex-start;
    margin-bottom: 18px;
  }

  .lesson-heading h1 {
    font-size: 26px;
  }

  .lesson-heading > div > span {
    font-size: 12px;
  }

  .access-state {
    display: none;
  }

  .player-frame {
    margin-right: -14px;
    margin-left: -14px;
    min-height: 210px;
    border-right: 0;
    border-left: 0;
    border-radius: 0;
  }

  .player-controls {
    gap: 4px;
    padding: 24px 9px 7px;
  }

  .control-row {
    gap: 4px;
  }

  .control-row__primary,
  .control-row__secondary {
    gap: 1px;
  }

  .control-row__primary > button:nth-of-type(2),
  .control-row__primary > button:nth-of-type(3),
  .control-row__secondary > button:disabled,
  .volume-control {
    display: none;
  }

  .control-row button {
    width: 40px;
    height: 40px;
  }

  .player-time {
    margin-left: 2px;
    font-size: 10px;
  }

  .rate-control select {
    width: 84px;
    height: 34px;
    padding: 0 4px;
  }

  .center-play-button {
    min-height: 46px;
    max-width: calc(100% - 28px);
    padding: 0 15px 0 13px;
  }

  .center-play-button span {
    overflow: hidden;
    text-overflow: ellipsis;
    white-space: nowrap;
  }

  .player-state:not(.player-state--security) {
    gap: 4px;
    padding: 8px 14px 50px;
  }

  .player-state:not(.player-state--security) .player-state__mark {
    width: 34px;
    height: 34px;
    margin-bottom: 0;
  }

  .player-state:not(.player-state--security) > strong {
    font-size: 13px;
  }

  .player-state:not(.player-state--security) > span:not(.player-state__mark):not(.player-spinner) {
    max-width: 330px;
    font-size: 10.5px;
    line-height: 1.35;
  }

  .player-state:not(.player-state--security) button {
    min-height: 32px;
    margin-top: 1px;
    font-size: 11px;
    padding: 0 13px;
  }

  .player-state--security {
    gap: 6px;
    padding: 14px 16px;
  }

  .player-state--security > strong {
    font-size: 15px;
  }

  .player-state--security > span:not(.security-lock__mark) {
    font-size: 11.5px;
    line-height: 1.42;
  }

  .player-state--security > small {
    font-size: 11px;
  }

  .player-state--security button {
    min-height: 36px;
    margin-top: 3px;
  }

  .security-lock__mark {
    width: 34px;
    height: 34px;
    margin-bottom: 0;
  }

  .security-lock__mark svg {
    width: 21px;
    height: 21px;
  }

  .player-preparing {
    padding-bottom: 46px;
  }

  .player-preparing__mark {
    width: 52px;
    height: 52px;
  }

  .preview-controls {
    height: 48px;
    grid-template-columns: 26px auto minmax(50px, 1fr) auto;
    gap: 9px;
    padding: 0 12px;
  }

  .lesson-summary {
    grid-template-columns: 1fr;
    padding: 17px;
  }

  .summary-action {
    width: 100%;
  }

  .watch-progress {
    grid-column: auto;
  }

  .security-strip {
    grid-template-columns: 1fr;
  }

  .protection-note summary {
    grid-template-columns: 20px minmax(0, 1fr);
  }

  .protection-note summary em {
    display: none;
  }

  .protection-note p {
    padding-left: 16px;
  }
}

@media (prefers-reduced-motion: reduce) {
  *,
  *::before,
  *::after {
    scroll-behavior: auto !important;
    animation-duration: 0.01ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: 0.01ms !important;
  }
}