:root {
  --font-sans: system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, sans-serif;
  --radius-base: 1rem;
  --gap-sm: .75rem;
  --gap-md: clamp(1rem, 3vw, 1.5rem);
  --c-bg: #fff;
  --c-surface: #f9fafb;
  --c-text: #111827;
  --c-subtext: #6b7280;
  --c-accent: #6366f1;
  --c-bg-accent: rgba(99,102,241,.1);
  --c-border: #e5e7eb;
  --c-danger: #ef4444;
  --shadow-elevate: 0 6px 12px rgba(0,0,0,.08);
}

@media (prefers-color-scheme: dark) {
  :root {
    --c-bg: #1f2937;
    --c-surface: #111827;
    --c-text: #f9fafb;
    --c-subtext: #9ca3af;
    --c-danger: #f87171;
    --shadow-elevate: 0 6px 12px rgba(0,0,0,.25);
  }
}

@media (prefers-reduced-motion: reduce) {
  * { transition: none !important; animation: none !important; }
}

/* ─── Global Resets & Defaults ───────────────────────────── */
html, body {
  height: 100%;
  margin: 0;
  font-family: var(--font-sans);
  background: var(--c-surface);
  color: var(--c-text);
  font-size: clamp(14px, 2vw, 16px);
  -webkit-font-smoothing: antialiased;
}

body {
  display: grid;
  place-content: center;
  padding: var(--gap-md);
}

/* ─── Card Component ─────────────────────────── */
.card {
  container-type: inline-size;
  background: var(--c-bg);
  border-radius: var(--radius-base);
  box-shadow: var(--shadow-elevate);
  overflow: hidden;
  max-width: 600px;
  width: 100%;
  transition: box-shadow .3s ease, transform .2s ease;
}

.card:hover {
  transform: translateY(-1px);
  box-shadow: 0 10px 18px rgba(0,0,0,.1);
}

/* ─── Header Component ──────────────────────────── */
.card-header {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: var(--gap-sm);
  padding: var(--gap-md);
}

@container (min-width: 350px) {
  .card-header {
    flex-direction: row;
    text-align: left;
  }
}

.card-header .avatar {
  width: 88px;
  height: 88px;
  border-radius: 50%;
  object-fit: cover;
  border: 3px solid var(--c-surface);
  transition: transform .3s ease;
}

.card:hover .avatar {
  transform: translateY(-2px);
}

.card-header .card-title {
  margin: .25rem 0 0;
  font-size: clamp(1.25rem, 4vw, 1.5rem);
  font-weight: 700;
}

.card-header .card-subtitle {
  margin: 0;
  font-size: .9rem;
  color: var(--c-subtext);
}

/* ─── Body Component ──────────────────────────── */
.card-body {
  padding: var(--gap-md);
  line-height: 1.6;
}

.card-body .bio {
  margin-bottom: var(--gap-md);
}

/* ─── Form Elements ───────────────────────────── */
textarea {
  width: 100%;
  min-height: 8rem;
  padding: .75rem;
  font: inherit;
  border: 1px solid var(--c-border);
  border-radius: .5rem;
  background: var(--c-surface);
  color: var(--c-text);
  resize: vertical;
  transition: border-color .2s ease, box-shadow .2s ease;
}

textarea:focus {
  border-color: var(--c-accent);
  box-shadow: 0 0 0 2px rgba(99,102,241,.3);
}

input[type="text"] {
  padding: .6rem;
  border: 1px solid var(--c-border);
  border-radius: .5rem;
  font: inherit;
}

/* ─── Button Components ────────────────────────── */
.toggle-btn,
.book-btn,
button[type="submit"] {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: .4rem;
  padding: .65rem 1.2rem;
  border: none;
  border-radius: .5rem;
  font-weight: 600;
  font-size: .9rem;
  cursor: pointer;
  text-decoration: none;
  transition: transform .2s ease, box-shadow .2s ease;
}

.toggle-btn {
  background: var(--c-accent);
  color: #fff;
}

.toggle-btn:hover,
.toggle-btn:focus {
  transform: translateY(-1px);
  box-shadow: var(--shadow-elevate);
}

.book-btn.primary {
  background: var(--c-accent);
  color: #fff;
}

.book-btn.neutral {
  background: var(--c-surface);
  color: var(--c-text);
  border: 1px solid var(--c-border);
}

.book-btn.accent {
  background: var(--c-bg-accent);
  color: var(--c-accent);
}

.book-btn.outline {
  background: transparent;
  color: var(--c-accent);
  border: 1px solid var(--c-accent);
}

.book-btn:hover,
.book-btn:focus {
  transform: translateY(-1px);
  box-shadow: var(--shadow-elevate);
}

.delete-btn {
  background: transparent;
  border: none;
  color: var(--c-subtext);
  font-size: .8rem;
  cursor: pointer;
  padding: 0 .5rem;
}

.delete-btn:hover {
  color: var(--c-danger);
}

/* ─── Navigation Links ──────────────────────────── */
.book-links {
  display: grid;
  gap: var(--gap-sm);
  margin-bottom: var(--gap-md);
  grid-template-columns: repeat(auto-fit, minmax(120px, 1fr));
}

/* ─── Visibility States ─────────────────────── */
.author-view,
.reader-view {
  display: none;
}

[data-state="author"] .author-view,
[data-state="reader"] .reader-view {
  display: block;
}

/* ─── Forms & Lists ─────────────────────────── */
form {
  display: grid;
  gap: var(--gap-sm);
  margin-bottom: var(--gap-sm);
}

ul.editable-list {
  list-style: disc;
  padding-left: 1.4rem;
  margin: var(--gap-sm) 0;
}

ul.editable-list li {
  margin-bottom: .4rem;
}

/* ─── Highlight Utilities ───────────────────────── */
.highlight-sub {
  border: 2px dashed var(--c-accent);
  padding: .5rem;
  background: var(--c-bg-accent);
  animation: pulse 2s infinite;
}

@keyframes pulse {
  0% { border-color: var(--c-accent); }
  50% { border-color: rgba(99,102,241,.5); }
  100% { border-color: var(--c-accent); }
}

[data-sub-mode="film"] ul[data-test-id="career-list"],
[data-sub-mode="assemble"] ul[data-test-id="teams-list"],
[data-sub-mode="buddy"] ul[data-test-id="collabs-list"],
[data-sub-mode="create"] ul[data-test-id="seeds-list"],
[data-sub-mode="add"] ul[data-test-id="lore-list"],
[data-sub-mode="explore"] ul[data-test-id="current-list"],
[data-sub-mode="draft"] ul[data-test-id="wip-list"] {
  background: var(--c-bg-accent);
  border-color: #10b981;
}

[data-sub-mode="add"] form[data-test-id="lore-form"],
[data-sub-mode="create"] form[data-test-id="seeds-form"],
[data-sub-mode="ask"] form[data-test-id="questions-form"],
[data-sub-mode="add"] form[data-test-id="log-form"],
[data-sub-mode="check"] form[data-test-id="claim-form"] {
  background: var(--c-bg-accent);
}

.is-active {
  box-shadow: 0 0 0 2px var(--c-accent);
}

body[data-editing] [contenteditable="true"] {
  outline: 2px solid var(--c-accent);
  background: var(--c-bg-accent);
}

/* ─── Responsive Enhancements ────────────────── */
@media (min-width: 640px) {
  .avatar {
    width: 72px;
    height: 72px;
  }
  .card-body {
    padding: calc(var(--gap-md) * 1.25);
  }
}

@media (min-width: 1024px) {
  body {
    padding: calc(var(--gap-md) * 2);
  }
  .book-links {
    grid-template-columns: repeat(auto-fit, minmax(140px, 1fr));
  }
}

/* ─── Help / Guide Overlay ─────────────────── */
.help-btn {
  background: none;
  border: none;
  font-size: 1.1rem;
  cursor: pointer;
  padding: .25rem;
  color: var(--c-accent);
  transition: transform .2s ease;
}

.help-btn:hover {
  transform: scale(1.2);
}

#helpPanel {
  position: fixed;
  inset: 0;
  background: rgba(0,0,0,.6);
  display: grid;
  place-content: center;
  z-index: 1000;
  transition: opacity .3s ease;
}

#helpPanel[hidden] {
  opacity: 0;
  pointer-events: none;
}

.help-panel-card {
  background: var(--c-bg);
  padding: 1.25rem;
  border-radius: 1rem;
  width: min(90vw, 400px);
  box-shadow: var(--shadow-elevate);
  transform: translateY(0);
  transition: transform .3s ease;
}

.help-panel-card h2 {
  margin-top: 0;
}

.help-panel-card ul {
  padding-left: 1.25rem;
}

.help-panel-card button {
  margin-top: 1rem;
}

.help-panel-card .dont-show-label {
  display: block;
  margin-top: 1rem;
  font-size: .9rem;
  color: var(--c-subtext);
}

/* ─── SR-only for ARIA ─────────────────────── */
.sr-only {
  position: absolute;
  width: 1px;
  height: 1px;
  padding: 0;
  margin: -1px;
  overflow: hidden;
  clip: rect(0,0,0,0);
  white-space: nowrap;
  border: 0;
}