/* Shared light theme for StudyTools tools. Loaded statically from every tool page <head>
   and re-injected as a fallback by js/premium-status.js. */
:root:root {
  color-scheme: light;
  --bg: #f8fafc;
  --bg2: #ffffff;
  --card-bg: #ffffff;
  --input-bg: #ffffff;
  --text: #0f172a;
  --muted: #64748b;
  --border: #e2e8f0;
  --line: #e2e8f0;
  --accent: #2563eb;
  --accent2: #2563eb;
  --accent3: #2563eb;
  --navy: #0f172a;
  --panel: #ffffff;
  --card: #f8fafc;
}

/* Keep native widgets (dropdown popups, scrollbars, spinners, pickers) light. */
html {
  color-scheme: light !important;
}

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

body {
  background: var(--bg) !important;
  color: var(--text) !important;
  font-family: system-ui, -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif !important;
}

nav {
  background: #ffffff !important;
  border-bottom: 1px solid var(--border) !important;
  backdrop-filter: none !important;
}

.nav a, .nav-links a {
  color: #475569 !important;
}

.nav a:hover, .nav-links a:hover {
  color: #0f172a !important;
  background: #f1f5f9 !important;
}

.nav-logo, .nav-back, .footer-logo, .brand {
  color: var(--navy) !important;
}

.nav-logo span, .mark {
  background: var(--accent) !important;
  color: #ffffff !important;
}

.calc-card, .form-card, .deck-card, .timer-card, .settings-section,
.schedule-card, .input-card, .response-card, .result-card, .app-card,
.tip-card, .scale-table, table, .side, .chat {
  background: #ffffff !important;
  border-color: var(--border) !important;
  box-shadow: 0 4px 20px rgba(15, 23, 42, 0.04) !important;
  color: var(--text) !important;
}

.side {
  background: #ffffff !important;
  border: 1px solid var(--border) !important;
}

.side h1, .side p {
  color: var(--navy) !important;
}

.side p {
  color: var(--muted) !important;
}

.quick button {
  background: #f8fafc !important;
  color: #1e293b !important;
  border: 1px solid var(--border) !important;
}

.quick button:hover {
  background: #f1f5f9 !important;
  border-color: #cbd5e1 !important;
}

.tools a {
  background: #eff6ff !important;
  color: #2563eb !important;
  border: 1px solid #bfdbfe !important;
  border-radius: 6px;
  padding: 4px 8px;
}

.chat {
  background: #ffffff !important;
  border: 1px solid var(--border) !important;
}

.chat-head {
  background: #ffffff !important;
  border-bottom: 1px solid var(--border) !important;
  color: #0f172a !important;
}

.chat-head strong {
  color: #0f172a !important;
}

.chat-actions button {
  background: #f8fafc !important;
  border: 1px solid var(--border) !important;
  color: #334155 !important;
}

.chat-actions button:hover {
  background: #f1f5f9 !important;
  border-color: var(--accent) !important;
}

.msgs {
  background: #f8fafc !important;
}

.msg {
  color: #0f172a !important;
  box-shadow: 0 2px 8px rgba(15, 23, 42, 0.03) !important;
}

.msg.ai {
  background: #ffffff !important;
  border: 1px solid #e2e8f0 !important;
  color: #0f172a !important;
}

.msg.user {
  background: #2563eb !important;
  color: #ffffff !important;
  border: 1px solid #2563eb !important;
}

.msg.err {
  background: #fef2f2 !important;
  color: #991b1b !important;
  border: 1px solid #fecaca !important;
}

.composer {
  background: #ffffff !important;
  border-top: 1px solid var(--border) !important;
}

.composer textarea {
  background: #f8fafc !important;
  color: #0f172a !important;
  border: 1px solid var(--border) !important;
}

.composer textarea:focus {
  background: #ffffff !important;
  outline: 2px solid #2563eb !important;
  border-color: #2563eb !important;
}

.send {
  background: #2563eb !important;
  color: #ffffff !important;
  border: none !important;
  cursor: pointer;
  border-radius: 8px;
  padding: 0 20px;
  font-weight: 700;
}

.send:hover {
  background: #1d4ed8 !important;
}

.note {
  color: #64748b !important;
  background: #ffffff !important;
}

input, select, textarea, .btn-secondary, .mode-btn, .btn-sm, .nav-btn {
  background: var(--input-bg) !important;
  color: var(--text) !important;
  border-color: var(--border) !important;
}

input:focus, select:focus, textarea:focus {
  outline: 2px solid #93c5fd !important;
  border-color: #3b82f6 !important;
}

.page-desc, .faq-a, .content-section p, .info-section p, .tip-card p, .muted, .char-count, .toolbar-label {
  color: var(--muted) !important;
}

h1, h2, h3, .question-text, .study-title, .deck-title, .settings-title {
  color: var(--navy) !important;
}

.btn-primary, .btn-solve, .btn-add, .btn-add-card, .btn-generate, .ctrl-start, .btn-sm-primary {
  background: var(--accent) !important;
  color: #fff !important;
}

.btn-primary:hover, .btn-solve:hover, .btn-add:hover, .btn-add-card:hover {
  box-shadow: 0 8px 24px rgba(37, 99, 235, 0.22) !important;
}

.result-panel {
  background: var(--bg) !important;
  border-color: var(--border) !important;
}

.response-body {
  color: #1e293b !important;
}

.response-body p, .response-body ol, .response-body ul {
  color: #334155 !important;
}

.footer-links a {
  color: var(--muted) !important;
}

.premium-badge {
  display: inline-flex;
  align-items: center;
  background: var(--accent);
  color: #fff !important;
  border-radius: 999px;
  padding: 4px 10px;
  margin-left: 8px;
  font-size: 0.75rem;
  font-weight: 750;
  text-decoration: none;
}

.premium-overlay {
  position: absolute;
  inset: 0;
  z-index: 2;
}

.premium-overlay-inner {
  position: absolute;
  inset: 0;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  gap: 8px;
  border-radius: inherit;
  background: rgba(15, 23, 42, 0.85);
  color: #fff;
  text-align: center;
  padding: 16px;
}

.premium-overlay-inner span {
  font-size: 0.85rem;
  opacity: 0.9;
}

.premium-overlay-inner a {
  background: #fff;
  color: var(--navy);
  border-radius: 8px;
  padding: 8px 12px;
  font-weight: 750;
  text-decoration: none;
}

@media (max-width: 640px) {
  nav { padding-inline: 16px !important; }
  .page-wrap { padding-inline: 16px !important; }
  .builder-layout, .form-grid, .selectors { grid-template-columns: 1fr !important; }
  .courses-header, .course-row, .assignments-header, .assignment-row {
    grid-template-columns: 1fr 80px 80px 40px !important;
    gap: 8px !important;
  }
  .input-footer, .timer-controls, .settings-footer {
    align-items: stretch;
    flex-direction: column;
  }
  .btn-solve, .ctrl-btn { width: 100%; }
}

/* --- Dropdowns: the legacy pages still declare dark tokens inline, so the
   shared light values are pinned here for the control and its popup. --- */
select {
  background-color: #ffffff !important;
  color: #0f172a !important;
  border-color: #cbd5e1 !important;
}

select:focus {
  background-color: #ffffff !important;
  color: #0f172a !important;
  border-color: #3b82f6 !important;
  outline: 2px solid #93c5fd !important;
}

select option,
select optgroup,
select[multiple] option {
  background-color: #ffffff !important;
  color: #0f172a !important;
  font-weight: inherit;
}

select option:checked,
select option:hover,
select option:focus {
  background: #eff6ff !important;
  color: #1d4ed8 !important;
}