:root {
  color-scheme: light;
}

html,
body {
  min-height: 100%;
}

body {
  margin: 0;
  font-family: var(--font-family-base);
  font-size: var(--font-size-md);
  line-height: var(--line-height-base);
  background: var(--color-bg);
  color: var(--color-text-primary);
}

:focus-visible {
  outline: 3px solid color-mix(in oklab, var(--color-steel-blue) 70%, transparent);
  outline-offset: 2px;
}

.site-header {
  position: sticky;
  top: 0;
  z-index: 20;
  background: color-mix(in oklab, var(--color-bg) 92%, white 8%);
  border-bottom: 1px solid var(--color-border-soft);
  backdrop-filter: blur(8px);
}

.container {
  max-width: var(--container-width);
  margin: 0 auto;
  padding: var(--space-4) var(--space-5);
}

.container-wide {
  max-width: var(--container-wide-width);
}

.site-nav {
  display: flex;
  align-items: center;
  justify-content: space-between;
  min-height: 56px;
  gap: var(--space-4);
}

.brand {
  color: var(--color-accent-strong);
  text-decoration: none;
  font-weight: var(--font-weight-bold);
  font-size: var(--font-size-lg);
  letter-spacing: 0.01em;
}

.nav-links {
  display: flex;
  align-items: center;
  gap: var(--space-2);
  min-height: 24px;
}

.nav-links a {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-height: 40px;
  padding: 0 var(--space-3);
  border-radius: var(--radius-pill);
  color: var(--color-text-muted);
  text-decoration: none;
  font-weight: var(--font-weight-medium);
  transition: background-color 120ms ease, color 120ms ease;
}

.nav-links a.active,
body.route-home .nav-home,
body.route-study .nav-study,
body.route-decks .nav-decks,
body.route-login .nav-login {
  background: color-mix(in oklab, var(--color-accent) 14%, transparent);
  color: var(--color-accent-strong);
}

.nav-links-top {
  display: none;
}

.content {
  min-height: calc(100vh - 76px);
  padding-top: var(--space-8);
  padding-bottom: calc(var(--space-8) + 88px);
}

h1,
h2,
h3 {
  margin: 0;
  line-height: var(--line-height-tight);
}

h1 {
  font-size: clamp(1.8rem, 4.5vw, var(--font-size-2xl));
  letter-spacing: -0.01em;
}

h2 {
  margin-top: var(--space-8);
  font-size: clamp(1.4rem, 4vw, var(--font-size-xl));
}

h3 {
  margin-top: var(--space-5);
  font-size: var(--font-size-lg);
}

p {
  margin: 0;
  color: var(--color-text-primary);
  opacity: 0.9;
}

p+p {
  margin-top: var(--space-3);
}

a {
  color: var(--color-accent-strong);
}

ul {
  margin: 0;
  padding-left: var(--space-5);
}

li+li {
  margin-top: var(--space-4);
}

.deck-list {
  list-style: none;
  padding-left: 0;
  display: grid;
  gap: var(--space-4);
}

.deck-list li+li {
  margin-top: 0;
}

.deck-list .card-item {
  margin-top: 0;
}

code {
  font-size: var(--font-size-sm);
  padding: 0 var(--space-1);
  border-radius: var(--radius-sm);
  background: color-mix(in oklab, var(--color-steel-blue) 14%, transparent);
}

.content strong {
  color: var(--color-accent-strong);
  font-weight: var(--font-weight-bold);
}

.error,
.import-status.error {
  color: var(--color-danger);
  opacity: 1;
}

.feedback {
  color: var(--color-success);
  opacity: 1;
}

.create-form,
.export-section,
.section,
.stats,
.session-meta,
.queue-list {
  margin-top: var(--space-6);
}

.create-form,
.row-form,
.export-section {
  display: grid;
  gap: var(--space-3);
}

.create-form {
  margin-bottom: var(--space-7);
  max-width: 500px;
}

.create-form label,
.row-form label {
  font-weight: var(--font-weight-semibold);
}

.create-form input,
.row-form input,
.row-form textarea {
  min-height: 42px;
  padding: var(--space-2) var(--space-3);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  font: inherit;
  background: var(--color-surface);
  color: var(--color-text-primary);
}

.row-form textarea {
  min-height: 120px;
  resize: vertical;
}

.create-form button,
.export-section button,
.actions button,
.inline-delete button,
button,
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-height: 40px;
  padding: var(--space-2) var(--space-4);
  border: 1px solid color-mix(in oklab, var(--color-accent) 42%, transparent);
  border-radius: var(--radius-md);
  font: inherit;
  font-weight: var(--font-weight-semibold);
  background: color-mix(in oklab, var(--color-accent) 84%, white 16%);
  color: #fff7ef;
  text-decoration: none;
  cursor: pointer;
  transition: transform 80ms ease, filter 120ms ease;
}

.btn-secondary {
  border-color: var(--color-border);
  background: var(--color-surface);
  color: var(--color-text-primary);
}

.btn-ghost {
  border-color: transparent;
  background: transparent;
  color: var(--color-accent-strong);
}

.btn-danger {
  border-color: color-mix(in oklab, var(--color-danger) 60%, transparent);
  background: color-mix(in oklab, var(--color-danger) 86%, white 14%);
  color: #fff7ef;
}

.actions button:not(:disabled):active,
button:not(:disabled):active,
.btn:active {
  transform: translateY(1px);
}

.create-form button,
.export-section button {
  width: fit-content;
}

button:disabled {
  opacity: 0.55;
  cursor: not-allowed;
}

.actions,
.push-permission-actions {
  display: flex;
  gap: var(--space-2);
  flex-wrap: wrap;
}

.card-item,
.stat,
.study-session,
.card,
.push-permission-banner,
.preview {
  border: 1px solid var(--color-border-soft);
  border-radius: var(--radius-lg);
  background: var(--color-surface);
  box-shadow: var(--shadow-soft);
}

.card-item,
.study-session,
.card {
  padding: var(--space-4);
}

.card-item {
  margin-top: var(--space-4);
}

.deck-title {
  margin: 0;
  font-weight: var(--font-weight-semibold);
  font-size: var(--font-size-lg);
}

.deck-title a {
  color: var(--color-text-primary);
  text-decoration: none;
}

.deck-title a:hover {
  color: var(--color-accent-strong);
  text-decoration: underline;
}

.card-text,
.question,
.answer {
  margin-top: var(--space-2);
  white-space: pre-wrap;
  word-break: break-word;
}

.question {
  color: var(--color-text-primary);
  font-weight: var(--font-weight-semibold);
}

.answer {
  color: var(--color-text-primary);
  opacity: 0.9;
}

.preview {
  margin-top: var(--space-3);
  padding: var(--space-3);
}

.inline-delete {
  margin-top: var(--space-3);
}

.import-status,
.export-status {
  min-height: 22px;
  color: var(--color-text-muted);
}

.stats {
  display: grid;
  gap: var(--space-3);
  grid-template-columns: repeat(auto-fit, minmax(132px, 1fr));
}

.stat {
  padding: var(--space-3) var(--space-4);
}

.stat-value {
  display: block;
  font-size: clamp(1.45rem, 5vw, 1.9rem);
  line-height: var(--line-height-tight);
  font-weight: var(--font-weight-bold);
  color: var(--color-accent-strong);
}

.stat-label,
.meta,
.status {
  font-size: var(--font-size-sm);
  color: var(--color-text-muted);
}

.session-meta {
  display: flex;
  flex-wrap: wrap;
  gap: var(--space-3);
  align-items: center;
}

.network-pill,
.sync-pill,
.type-pill {
  width: fit-content;
  border: 1px solid var(--color-border);
  border-radius: var(--radius-pill);
  padding: var(--space-1) var(--space-3);
  font-size: var(--font-size-sm);
  color: var(--color-text-primary);
  background: color-mix(in oklab, var(--color-steel-blue) 14%, transparent);
}

.network-pill.offline {
  border-color: color-mix(in oklab, var(--color-warning) 55%, transparent);
}

.study-session {
  display: grid;
  gap: var(--space-3);
}

.rate-btn {
  flex: 1 1 132px;
}

.rate-again {
  border-color: color-mix(in oklab, var(--color-danger) 60%, transparent);
  background: color-mix(in oklab, var(--color-danger) 86%, white 14%);
}

.rate-hard {
  border-color: color-mix(in oklab, var(--color-warning) 60%, transparent);
  background: color-mix(in oklab, var(--color-warning) 78%, white 22%);
}

.rate-good {
  border-color: color-mix(in oklab, var(--color-steel-blue) 55%, transparent);
  background: color-mix(in oklab, var(--color-steel-blue) 72%, var(--color-deep-space-blue) 28%);
}

.rate-easy {
  border-color: color-mix(in oklab, var(--color-success) 60%, transparent);
  background: color-mix(in oklab, var(--color-success) 82%, white 18%);
}

.push-permission-banner {
  margin-top: var(--space-4);
  padding: var(--space-3) var(--space-4);
}

.push-permission-banner[hidden],
.session-card-answer[hidden] {
  display: none;
}

.status {
  margin-top: var(--space-4);
}

.error-page .actions {
  margin-top: var(--space-6);
}

.bottom-nav {
  position: fixed;
  left: 0;
  right: 0;
  bottom: 0;
  z-index: 30;
  border-top: 1px solid var(--color-border-soft);
  background: color-mix(in oklab, var(--color-bg) 94%, white 6%);
  padding: var(--space-2) var(--space-4) calc(var(--space-2) + env(safe-area-inset-bottom));
}

.bottom-nav .nav-links {
  max-width: var(--container-width);
  margin: 0 auto;
  justify-content: space-between;
}

.bottom-nav .nav-links a {
  flex: 1 1 0;
  min-height: 42px;
  border-radius: var(--radius-md);
}

@media (min-width: 860px) {
  .nav-links-top {
    display: flex;
  }

  .bottom-nav {
    display: none;
  }

  .content {
    padding-top: var(--space-8);
    padding-bottom: var(--space-8);
  }
}