:root {
  --bg: #101010;
  --fg: #ededed;
  --accent: #814afe;
  --accent-soft: rgba(129, 74, 254, 0.14);
  --text-soft: rgba(237, 237, 237, 0.72);
  --text-dim: rgba(237, 237, 237, 0.5);
  --border: rgba(237, 237, 237, 0.12);
  --panel: rgba(255, 255, 255, 0.035);
  --radius-xl: 2rem;
  --radius-lg: 1.5rem;
  --radius-md: 1rem;
}

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

html {
  color-scheme: dark;
}

body {
  margin: 0;
  min-height: 100svh;
  font-family: "Google Sans", "Segoe UI", sans-serif;
  background: var(--bg);
  color: var(--fg);
  -webkit-font-smoothing: antialiased;
  text-rendering: optimizeLegibility;
}

body::before,
body::after {
  content: "";
  position: fixed;
  inset: 0;
  pointer-events: none;
}

body::before {
  background:
    radial-gradient(circle at 12% 12%, rgba(129, 74, 254, 0.16), transparent 26%),
    radial-gradient(circle at 82% 24%, rgba(129, 74, 254, 0.12), transparent 18%);
}

body::after {
  background-image:
    linear-gradient(rgba(255, 255, 255, 0.02) 1px, transparent 1px),
    linear-gradient(90deg, rgba(255, 255, 255, 0.02) 1px, transparent 1px);
  background-size: 4.5rem 4.5rem;
  mask-image: linear-gradient(180deg, rgba(0, 0, 0, 0.34), transparent 82%);
  opacity: 0.28;
}

a,
button,
input {
  font: inherit;
}

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

button {
  cursor: pointer;
}

code {
  font-family: "SFMono-Regular", Consolas, "Liberation Mono", Menlo, monospace;
  font-size: 0.94em;
}

.portal-shell {
  position: relative;
  z-index: 1;
  min-height: 100svh;
  width: min(100%, 82rem);
  margin: 0 auto;
  padding: clamp(1.25rem, 3vw, 2rem);
}

.login-shell {
  display: grid;
  place-items: center;
}

.portal-header {
  display: flex;
  align-items: flex-start;
  justify-content: space-between;
  gap: 1rem;
}

.portal-brand {
  display: flex;
  align-items: center;
  gap: 1rem;
  min-width: 0;
}

.portal-logo {
  width: auto;
  height: 2.15rem;
  flex: 0 0 auto;
}

.portal-kicker {
  margin: 0 0 0.2rem;
  color: var(--accent);
  font-size: 0.82rem;
  font-weight: 600;
  letter-spacing: 0.06em;
  text-transform: uppercase;
}

.portal-brand h1,
.portal-hero h2,
.lecture-copy h3 {
  margin: 0;
  letter-spacing: -0.04em;
}

.portal-brand h1 {
  font-size: clamp(1.4rem, 2.4vw, 2rem);
}

.portal-hero {
  display: grid;
  gap: 0.7rem;
  margin-top: 2.6rem;
  max-width: 44rem;
}

.portal-hero h2 {
  font-size: clamp(2rem, 5vw, 4rem);
  line-height: 0.98;
}

.portal-copy {
  margin: 0;
  color: var(--text-soft);
  line-height: 1.55;
}

.portal-actions {
  display: flex;
  flex-wrap: wrap;
  justify-content: flex-end;
  gap: 0.7rem;
}

.small-action,
.primary-btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 0.55rem;
  border-radius: 999px;
  transition:
    transform 180ms ease,
    border-color 180ms ease,
    background-color 180ms ease,
    color 180ms ease;
}

.small-action {
  padding: 0.7rem 1rem;
  border: 1px solid var(--border);
  background: rgba(255, 255, 255, 0.04);
  color: var(--text-soft);
}

.small-action.is-static {
  cursor: default;
}

.small-action:hover,
.small-action:focus-visible,
.primary-btn:hover,
.primary-btn:focus-visible {
  transform: translateY(-1px);
  border-color: rgba(129, 74, 254, 0.46);
}

.primary-btn {
  border: 1px solid rgba(129, 74, 254, 0.44);
  background: rgba(129, 74, 254, 0.18);
  color: var(--fg);
  padding: 0.92rem 1.15rem;
}

.portal-panel,
.lecture-card {
  border: 1px solid var(--border);
  border-radius: var(--radius-lg);
  background: var(--panel);
  backdrop-filter: blur(10px);
}

.portal-panel {
  display: grid;
  gap: 1.2rem;
  padding: clamp(1.35rem, 2vw, 1.7rem);
}

.login-panel {
  width: min(100%, 37rem);
}

.portal-form {
  display: grid;
  gap: 1rem;
}

.login-tabs {
  min-inline-size: 0;
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 0.7rem;
  margin: 0;
  padding: 0;
  border: 0;
}

.login-tabs-legend {
  margin: 0 0 0.1rem;
  padding: 0;
  color: var(--text-soft);
  font-size: 0.92rem;
}

.tab-option {
  position: relative;
  display: block;
  cursor: pointer;
}

.tab-option input {
  position: absolute;
  inset: 0;
  opacity: 0;
  pointer-events: none;
}

.tab-option span {
  display: inline-flex;
  width: 100%;
  align-items: center;
  justify-content: center;
  gap: 0.55rem;
  min-height: 3.2rem;
  padding: 0.85rem 1rem;
  border: 1px solid var(--border);
  border-radius: var(--radius-md);
  background: rgba(255, 255, 255, 0.04);
  color: var(--text-soft);
  text-align: center;
  transition:
    border-color 180ms ease,
    background-color 180ms ease,
    color 180ms ease,
    transform 180ms ease;
}

.tab-option:hover span,
.tab-option:focus-within span {
  transform: translateY(-1px);
  border-color: rgba(129, 74, 254, 0.32);
}

.tab-option input:checked + span {
  border-color: rgba(129, 74, 254, 0.52);
  background: rgba(129, 74, 254, 0.16);
  color: var(--fg);
}

.role-hint-grid {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 0.8rem;
}

.role-hint {
  margin: 0;
  padding: 0.9rem 1rem;
  border: 1px solid var(--border);
  border-radius: var(--radius-md);
  background: rgba(255, 255, 255, 0.03);
  color: var(--text-soft);
  line-height: 1.45;
}

.role-hint strong {
  color: var(--fg);
}

.field-block {
  display: grid;
  gap: 0.5rem;
}

.field-block span {
  font-size: 0.92rem;
  color: var(--text-soft);
}

.field-block input {
  width: 100%;
  min-height: 3.3rem;
  border: 1px solid var(--border);
  border-radius: var(--radius-md);
  background: rgba(255, 255, 255, 0.04);
  color: var(--fg);
  padding: 0.9rem 1rem;
  outline: none;
  transition:
    border-color 180ms ease,
    background-color 180ms ease,
    box-shadow 180ms ease;
}

.field-block input:focus {
  border-color: rgba(129, 74, 254, 0.52);
  background: rgba(255, 255, 255, 0.06);
  box-shadow: 0 0 0 4px rgba(129, 74, 254, 0.12);
}

.status-message {
  margin: 0;
  padding: 0.9rem 1rem;
  border-radius: var(--radius-md);
  line-height: 1.45;
}

.status-message.is-error {
  border: 1px solid rgba(255, 96, 122, 0.28);
  background: rgba(255, 96, 122, 0.08);
  color: #ffb8c3;
}

.status-message.is-success {
  border: 1px solid rgba(129, 74, 254, 0.3);
  background: rgba(129, 74, 254, 0.11);
  color: var(--fg);
}

.lecture-grid {
  display: grid;
  gap: 1rem;
  margin-top: 1.6rem;
}

.lecture-card {
  display: grid;
  gap: 1.1rem;
  padding: clamp(1.25rem, 2vw, 1.65rem);
}

.lecture-card:hover,
.lecture-card:focus-visible {
  border-color: rgba(129, 74, 254, 0.42);
  background:
    linear-gradient(180deg, rgba(129, 74, 254, 0.08), rgba(129, 74, 254, 0.02)),
    var(--panel);
}

.lecture-card-head,
.lecture-meta {
  display: flex;
  flex-wrap: wrap;
  justify-content: space-between;
  gap: 0.8rem;
  align-items: center;
}

.lecture-index,
.lecture-pill {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  border-radius: 999px;
  font-size: 0.78rem;
  letter-spacing: 0.06em;
  text-transform: uppercase;
}

.lecture-index {
  color: var(--accent);
  font-weight: 700;
}

.lecture-pill {
  padding: 0.5rem 0.82rem;
  border: 1px solid var(--border);
  background: rgba(255, 255, 255, 0.04);
  color: var(--text-soft);
}

.lecture-copy {
  display: grid;
  gap: 0.55rem;
}

.lecture-copy h3 {
  font-size: clamp(1.35rem, 2.5vw, 2rem);
  line-height: 1.02;
}

.lecture-copy p,
.lecture-meta {
  margin: 0;
  color: var(--text-soft);
  line-height: 1.5;
}

.lecture-meta span {
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
}

.settings-shell {
  width: min(100%, 68rem);
}

.settings-panel {
  margin-top: 2rem;
}

.settings-grid {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 1rem;
}

.settings-card {
  display: grid;
  gap: 1rem;
  padding: 1.2rem;
  border: 1px solid var(--border);
  border-radius: var(--radius-md);
  background: rgba(255, 255, 255, 0.03);
}

.settings-card-head {
  display: grid;
  gap: 0.45rem;
}

.settings-card-head h2 {
  margin: 0;
  font-size: clamp(1.35rem, 2.8vw, 1.9rem);
  letter-spacing: -0.04em;
}

.settings-form {
  margin-top: 0.3rem;
}

@media (max-width: 760px) {
  .portal-header {
    flex-direction: column;
  }

  .portal-actions {
    width: 100%;
    justify-content: flex-start;
  }

  .portal-brand {
    align-items: flex-start;
  }

  .portal-logo {
    height: 1.95rem;
  }

  .portal-shell {
    padding-bottom: 1.4rem;
  }

  .role-hint-grid,
  .settings-grid {
    grid-template-columns: 1fr;
  }
}

@media (prefers-reduced-motion: reduce) {
  *,
  *::before,
  *::after {
    animation: none !important;
    transition-duration: 0.01ms !important;
    transition-delay: 0ms !important;
    scroll-behavior: auto !important;
  }
}