:root {
  color-scheme: light;
  --bg: #fff8f2;
  --surface: #ffffff;
  --surface-muted: #f5e9de;
  --border: #e2cdbb;
  --text: #26352f;
  --muted: #6d625a;
  --brand: #cd5019;
  --brand-hover: #a63f13;
  --danger-bg: #fff0f0;
  --danger-border: #e5484d;
  --danger-text: #9b2025;
  --shadow: 0 1px 2px rgba(83, 50, 32, 0.06), 0 8px 24px rgba(83, 50, 32, 0.1);
  --font-sans: "Noto Sans TC", "Inter", system-ui, -apple-system, "PingFang TC", "Microsoft JhengHei", sans-serif;
}

* {
  box-sizing: border-box;
}

html {
  background: var(--bg);
}

body {
  min-height: 100vh;
  margin: 0;
  color: var(--text);
  background: var(--bg);
  font-family: var(--font-sans);
  line-height: 1.6;
}

a {
  color: inherit;
}

.site-header {
  min-height: 64px;
  padding: 0.75rem clamp(1rem, 4vw, 3rem);
  border-bottom: 1px solid var(--border);
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  justify-content: space-between;
  gap: 1rem;
  background: var(--surface);
}

.site-header__nav {
  display: flex;
  align-items: center;
  gap: clamp(0.75rem, 2vw, 1.5rem);
}

.brand-logo {
  display: block;
  width: clamp(10rem, 20vw, 13.5rem);
  height: auto;
}

.site-header__link {
  color: var(--text);
  font-weight: 700;
  text-decoration: none;
}

.site-header__link:hover {
  color: var(--brand-hover);
}

.logout-form {
  margin-left: auto;
}

main {
  width: min(1120px, calc(100% - 2rem));
  margin: 0 auto;
  padding: clamp(3rem, 8vh, 6rem) 0;
}

.login-panel {
  width: min(100%, 520px);
  margin: 0 auto;
  padding: clamp(1.5rem, 5vw, 3rem);
  border: 1px solid var(--border);
  border-radius: 8px;
  background: var(--surface);
  box-shadow: var(--shadow);
}

.eyebrow {
  margin: 0 0 0.5rem;
  color: var(--brand);
  font-size: 0.875rem;
  font-weight: 700;
  text-transform: uppercase;
}

h1 {
  margin: 0;
  font-size: clamp(2rem, 6vw, 3.25rem);
  line-height: 1.15;
  letter-spacing: 0;
}

.lead {
  margin: 1rem 0 1.75rem;
  color: var(--muted);
}

.login-form {
  display: grid;
  gap: 0.75rem;
}

label {
  font-weight: 700;
}

input[type="email"] {
  width: 100%;
  min-height: 48px;
  padding: 0.75rem 0.875rem;
  border: 1px solid var(--border);
  border-radius: 6px;
  color: var(--text);
  background: var(--surface);
  font: inherit;
}

input[type="email"]:focus {
  border-color: var(--brand);
  outline: 3px solid rgba(205, 80, 25, 0.18);
}

.button {
  min-height: 44px;
  padding: 0.65rem 1rem;
  border: 1px solid transparent;
  border-radius: 6px;
  font: inherit;
  font-weight: 700;
  cursor: pointer;
  transition: background-color 0.15s ease, border-color 0.15s ease;
}

.button-primary {
  margin-top: 0.5rem;
  color: #ffffff;
  background: var(--brand);
}

.button-primary:hover {
  background: var(--brand-hover);
}

.button-secondary {
  color: var(--text);
  border-color: var(--border);
  background: transparent;
}

.button-secondary:hover {
  background: var(--surface-muted);
}

.form-error {
  margin: 0 0 1rem;
  padding: 0.75rem 1rem;
  border: 1px solid var(--danger-border);
  border-radius: 6px;
  color: var(--danger-text);
  background: var(--danger-bg);
}

.replay-layout {
  display: grid;
  grid-template-columns: minmax(0, 264px) minmax(0, 1fr);
  gap: clamp(1.5rem, 4vw, 2.5rem);
  align-items: start;
}

.session-nav {
  border: 1px solid var(--border);
  border-radius: 8px;
  background: var(--surface);
  box-shadow: var(--shadow);
  overflow: hidden;
}

.session-nav__toggle {
  display: none;
  width: 100%;
  align-items: center;
  gap: 0.75rem;
  padding: 0.875rem 1rem;
  border: 0;
  color: inherit;
  background: var(--surface);
  font: inherit;
  text-align: left;
  cursor: pointer;
}

.session-nav__burger {
  position: relative;
  flex: none;
  width: 20px;
  height: 2px;
  background: var(--brand);
}

.session-nav__burger::before,
.session-nav__burger::after {
  content: "";
  position: absolute;
  left: 0;
  width: 20px;
  height: 2px;
  background: var(--brand);
}

.session-nav__burger::before {
  top: -6px;
}

.session-nav__burger::after {
  top: 6px;
}

.session-nav__toggle-text {
  display: grid;
  min-width: 0;
}

.session-nav__toggle-label {
  color: var(--muted);
  font-size: 0.75rem;
  font-weight: 700;
  text-transform: uppercase;
}

.session-nav__toggle-current {
  overflow: hidden;
  font-weight: 700;
  white-space: nowrap;
  text-overflow: ellipsis;
}

.session-nav__list {
  margin: 0;
  padding: 0;
  list-style: none;
}

.session-nav__link {
  display: block;
  padding: 0.875rem 1rem;
  border-left: 3px solid transparent;
  border-bottom: 1px solid var(--border);
  color: var(--text);
  font-weight: 700;
  text-decoration: none;
}

.session-nav__list li:last-child .session-nav__link {
  border-bottom: 0;
}

.session-nav__link:hover {
  background: var(--surface-muted);
}

.session-nav__link:focus-visible {
  outline: 3px solid rgba(205, 80, 25, 0.18);
  outline-offset: -3px;
}

.session-nav__link.is-current {
  border-left-color: var(--brand);
  color: var(--brand);
  background: var(--surface-muted);
}

.replay-section {
  display: grid;
  gap: 1.5rem;
  min-width: 0;
}

.replay-heading {
  max-width: 800px;
}

.video-frame {
  width: 100%;
  aspect-ratio: 16 / 9;
  overflow: hidden;
  background: #000000;
}

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

.session-description {
  padding: 1rem 1.125rem;
  border: 1px solid var(--border);
  border-radius: 8px;
  background: var(--surface);
  white-space: pre-wrap;
}

.replay-timestamp {
  color: var(--brand);
  font-weight: 700;
  text-decoration-thickness: 1px;
  text-underline-offset: 0.2em;
}

.replay-timestamp:hover {
  color: var(--brand-hover);
}

.replay-timestamp:focus-visible {
  border-radius: 2px;
  outline: 3px solid rgba(205, 80, 25, 0.18);
  outline-offset: 2px;
}

.privacy-note {
  margin: 0;
  color: var(--muted);
  font-size: 0.875rem;
}

@media (max-width: 900px) {
  .replay-layout {
    grid-template-columns: minmax(0, 1fr);
  }

  .session-nav__toggle {
    display: flex;
  }

  .session-nav[data-js="true"] .session-nav__list {
    display: none;
    border-top: 1px solid var(--border);
  }

  .session-nav[data-js="true"][data-open="true"] .session-nav__list {
    display: block;
  }
}

@media (max-width: 520px) {
  .site-header__nav {
    width: 100%;
    gap: 0.75rem;
  }

  .brand-logo {
    width: min(9.5rem, 42vw);
  }

  .site-header__link {
    font-size: 0.9375rem;
  }
}

@media (prefers-reduced-motion: reduce) {
  *,
  *::before,
  *::after {
    scroll-behavior: auto !important;
    transition: none !important;
  }
}