/* =========================================================
   IGCSE 0580 Topics Recap Map — Stylesheet
   Matches the Claude widget aesthetic: flat, clean, minimal
   ========================================================= */

.nav-btn.dimmed { opacity: 0.35; }


/* -- Design tokens (light mode default) -- */
:root {
  --color-background-primary: #ffffff;
  --color-background-secondary: #f5f4ee;
  --color-background-tertiary: #faf9f5;
  --color-background-info: #E6F1FB;
  --color-background-danger: #FCEBEB;
  --color-background-success: #EAF3DE;
  --color-background-warning: #FAEEDA;

  --color-text-primary: #1f1e1d;
  --color-text-secondary: #6b6a66;
  --color-text-tertiary: #9a9892;
  --color-text-info: #0C447C;
  --color-text-danger: #791F1F;
  --color-text-success: #27500A;
  --color-text-warning: #633806;

  --color-border-tertiary: rgba(0, 0, 0, 0.10);
  --color-border-secondary: rgba(0, 0, 0, 0.20);
  --color-border-primary: rgba(0, 0, 0, 0.35);
  --color-border-info: #378ADD;
  --color-border-warning: #EF9F27;

  --font-sans: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
  --font-mono: "SF Mono", Menlo, Consolas, "Courier New", monospace;

  --border-radius-md: 8px;
  --border-radius-lg: 12px;
  --border-radius-xl: 16px;
}

/* -- Dark mode -- */
body.dark-mode {
  --color-background-primary: #1e1d1b;
  --color-background-secondary: #262522;
  --color-background-tertiary: #18171600;
  --color-background-info: #042C53;
  --color-background-danger: #501313;
  --color-background-success: #173404;
  --color-background-warning: #412402;

  --color-text-primary: #f5f4ee;
  --color-text-secondary: #a8a69e;
  --color-text-tertiary: #797770;
  --color-text-info: #B5D4F4;
  --color-text-danger: #F7C1C1;
  --color-text-success: #C0DD97;
  --color-text-warning: #FAC775;

  --color-border-tertiary: rgba(255, 255, 255, 0.12);
  --color-border-secondary: rgba(255, 255, 255, 0.22);
  --color-border-primary: rgba(255, 255, 255, 0.40);
  --color-border-info: #85B7EB;
  --color-border-warning: #FAC775;
}

/* -- Base reset -- */
* {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}

html {
  scroll-behavior: smooth;
}

body {
  font-family: var(--font-sans);
  font-size: 16px;
  line-height: 1.6;
  color: var(--color-text-primary);
  background: var(--color-background-tertiary);
  min-height: 100vh;
  padding: 2rem 1rem;
  transition: background 0.2s ease, color 0.2s ease;
}

/* -- Container -- */
.container {
  max-width: 720px;
  margin: 0 auto;
}

/* -- Page header -- */
.page-header {
  position: relative;
  margin: 0 0 2rem;
  padding-bottom: 1.5rem;
  border-bottom: 0.5px solid var(--color-border-tertiary);
}

.page-header h1 {
  font-size: 24px;
  font-weight: 500;
  margin: 0 0 4px;
  color: var(--color-text-primary);
}

.subtitle {
  font-size: 14px;
  color: var(--color-text-secondary);
}

.theme-toggle {
  position: absolute;
  top: 0;
  right: 0;
  width: 36px;
  height: 36px;
  border-radius: var(--border-radius-md);
  border: 0.5px solid var(--color-border-tertiary);
  background: var(--color-background-primary);
  cursor: pointer;
  font-size: 18px;
  color: var(--color-text-primary);
  display: flex;
  align-items: center;
  justify-content: center;
  transition: all 0.15s ease;
}

.theme-toggle:hover {
  border-color: var(--color-border-secondary);
  background: var(--color-background-secondary);
}

/* -- Summary grid -- */
.summary-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(160px, 1fr));
  gap: 10px;
  margin: 0 0 1.5rem;
}

.summary-card {
  background: var(--color-background-secondary);
  border-radius: var(--border-radius-md);
  padding: 12px 14px;
}

.summary-card .s-label {
  font-size: 12px;
  color: var(--color-text-secondary);
  margin-bottom: 4px;
}

.summary-card .s-value {
  font-size: 15px;
  font-weight: 500;
}

/* -- Section headings -- */
.module-heading {
  font-size: 16px;
  font-weight: 500;
  margin: 1.5rem 0 0.75rem;
  color: var(--color-text-primary);
}

/* -- Topic navigation -- */
.topic-nav {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(140px, 1fr));
  gap: 8px;
  margin: 0 0 1.5rem;
}

.nav-btn {
  padding: 10px 8px;
  border-radius: var(--border-radius-md);
  border: 0.5px solid var(--color-border-tertiary);
  background: var(--color-background-primary);
  cursor: pointer;
  font-size: 13px;
  font-weight: 500;
  text-align: center;
  transition: all 0.15s ease;
  color: var(--color-text-primary);
  font-family: inherit;
}

.nav-btn:hover {
  border-color: var(--color-border-secondary);
  background: var(--color-background-secondary);
}

.nav-btn.active {
  background: var(--color-background-info);
  color: var(--color-text-info);
  border-color: var(--color-border-info);
}

/* -- Topic cards -- */
.topic-card {
  background: var(--color-background-primary);
  border: 0.5px solid var(--color-border-tertiary);
  border-radius: var(--border-radius-lg);
  padding: 1.25rem 1.5rem;
  margin: 0 0 1rem;
  transition: opacity 0.2s ease;
}

.topic-card.hidden {
  display: none;
}

.topic-header {
  display: flex;
  align-items: center;
  gap: 10px;
  margin: 0 0 12px;
}

.topic-num {
  width: 28px;
  height: 28px;
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 13px;
  font-weight: 500;
  flex-shrink: 0;
}

/* Topic number colors */
.color-purple      { background: #EEEDFE; color: #3C3489; }
.color-teal        { background: #E1F5EE; color: #085041; }
.color-coral       { background: #FAECE7; color: #712B13; }
.color-pink        { background: #FBEAF0; color: #72243E; }
.color-blue        { background: #E6F1FB; color: #0C447C; }
.color-amber       { background: #FAEEDA; color: #633806; }
.color-purple-alt  { background: #CECBF6; color: #26215C; }

body.dark-mode .color-purple      { background: #3C3489; color: #EEEDFE; }
body.dark-mode .color-teal        { background: #085041; color: #E1F5EE; }
body.dark-mode .color-coral       { background: #712B13; color: #FAECE7; }
body.dark-mode .color-pink        { background: #72243E; color: #FBEAF0; }
body.dark-mode .color-blue        { background: #0C447C; color: #E6F1FB; }
body.dark-mode .color-amber       { background: #633806; color: #FAEEDA; }
body.dark-mode .color-purple-alt  { background: #26215C; color: #CECBF6; }

.topic-title {
  font-size: 18px;
  font-weight: 500;
  margin: 0;
  color: var(--color-text-primary);
}

.extended-tag {
  font-size: 12px;
  color: var(--color-text-secondary);
  font-weight: 400;
}

.topic-intro {
  font-size: 14px;
  margin: 0 0 8px;
  color: var(--color-text-primary);
}

.topic-intro strong {
  font-weight: 500;
}

/* -- Grids inside cards -- */
.grid-2 {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 10px;
}

@media (max-width: 480px) {
  .grid-2 {
    grid-template-columns: 1fr;
  }
}

/* -- Formula box -- */
.formula-box {
  background: var(--color-background-secondary);
  border-radius: var(--border-radius-md);
  padding: 10px 14px;
  margin: 8px 0;
  font-family: var(--font-mono);
  font-size: 14px;
  color: var(--color-text-primary);
  word-wrap: break-word;
}

.formula-box .label {
  font-family: var(--font-sans);
  font-size: 12px;
  color: var(--color-text-secondary);
  display: block;
  margin-bottom: 4px;
  font-weight: 500;
}

.formula-box.success {
  color: var(--color-text-success);
}

.formula-box.danger {
  color: var(--color-text-danger);
}

/* -- Fact list -- */
.fact-list {
  margin: 8px 0;
  padding: 0;
  list-style: none;
}

.fact-list li {
  padding: 4px 0;
  font-size: 14px;
  line-height: 1.6;
  color: var(--color-text-primary);
}

.fact-list li::before {
  content: "→ ";
  color: var(--color-text-secondary);
  font-weight: 500;
}

/* -- Section sub-headings inside cards -- */
.section-h {
  font-size: 14px;
  font-weight: 500;
  margin: 12px 0 6px;
  color: var(--color-text-primary);
}

/* -- Pills -- */
.pill {
  display: inline-block;
  padding: 3px 10px;
  border-radius: 10px;
  font-size: 12px;
  font-weight: 500;
  margin: 2px 4px 2px 0;
}

.pill-info    { background: var(--color-background-info);    color: var(--color-text-info); }
.pill-success { background: var(--color-background-success); color: var(--color-text-success); }
.pill-warning { background: var(--color-background-warning); color: var(--color-text-warning); }
.pill-danger  { background: var(--color-background-danger);  color: var(--color-text-danger); }

/* -- Example + tip boxes -- */
.example-box {
  border-left: 2px solid var(--color-border-info);
  background: var(--color-background-info);
  padding: 8px 12px;
  margin: 8px 0;
  font-size: 13px;
  border-radius: 0;
  color: var(--color-text-primary);
}

.example-box .eg-label {
  font-size: 11px;
  font-weight: 500;
  color: var(--color-text-info);
  text-transform: uppercase;
  letter-spacing: 0.5px;
  margin-bottom: 4px;
  display: block;
}

.tip-box {
  border-left: 2px solid var(--color-border-warning);
  background: var(--color-background-warning);
  padding: 8px 12px;
  margin: 8px 0;
  font-size: 13px;
  border-radius: 0;
  color: var(--color-text-primary);
}

.tip-box .tip-label {
  font-size: 11px;
  font-weight: 500;
  color: var(--color-text-warning);
  text-transform: uppercase;
  letter-spacing: 0.5px;
  margin-bottom: 4px;
  display: block;
}

/* -- Strategy box -- */
.strategy-box {
  background: var(--color-background-secondary);
  border-radius: var(--border-radius-lg);
  padding: 1rem 1.25rem;
  margin: 1.5rem 0 0;
}

/* -- Page footer -- */
.page-footer {
  margin: 2rem 0 1rem;
  padding-top: 1.5rem;
  border-top: 0.5px solid var(--color-border-tertiary);
  text-align: center;
  font-size: 13px;
  color: var(--color-text-tertiary);
}

/* -- Print styles -- */
@media print {
  body {
    padding: 0;
    background: white;
  }
  .topic-nav,
  .theme-toggle {
    display: none;
  }
  .topic-card.hidden {
    display: block !important;
  }
  .topic-card {
    page-break-inside: avoid;
    break-inside: avoid;
    border: 1px solid #ccc;
  }
}

/* -- Smooth transitions on theme change -- */
.topic-card,
.summary-card,
.formula-box,
.example-box,
.tip-box,
.strategy-box,
.nav-btn {
  transition: background 0.2s ease, color 0.2s ease, border-color 0.2s ease;
}


/* =========================================================
   Global topnav, area tiles, chat panel — uses real tokens
   ========================================================= */

.topnav {
  display: flex;
  align-items: center;
  gap: 1.5rem;
  padding: 0.7rem 2rem;
  background: var(--color-background-primary);
  border-bottom: 1px solid var(--color-border-tertiary);
  position: sticky; top: 0; z-index: 50;
  flex-wrap: wrap;
  font-family: var(--font-sans);
}
.topnav-brand {
  font-weight: 700;
  font-size: 1.02rem;
  text-decoration: none;
  color: var(--color-text-primary);
  letter-spacing: -0.01em;
}
.topnav-brand::before {
  content: "◐ ";
  color: var(--color-text-tertiary);
  margin-right: 0.3rem;
}
.topnav-links, .topnav-right {
  display: flex; align-items: center; gap: 0.25rem;
}
.topnav-right { margin-left: auto; }

.topnav-link {
  text-decoration: none;
  color: var(--color-text-secondary);
  padding: 0.4rem 0.8rem;
  border-radius: var(--border-radius-md);
  border: 0; background: transparent; cursor: pointer;
  font: inherit; font-size: 0.92rem;
  transition: background 0.12s, color 0.12s;
}
.topnav-link:hover {
  background: var(--color-background-secondary);
  color: var(--color-text-primary);
}
.topnav-admin {
  color: var(--color-text-warning);
  font-weight: 600;
}
.topnav-signin {
  background: var(--color-text-primary);
  color: var(--color-background-primary);
}
.topnav-signin:hover {
  background: var(--color-text-primary);
  color: var(--color-background-primary);
  opacity: 0.85;
}
.topnav-syllabus {
  text-decoration: none;
  font-size: 0.82rem;
  color: var(--color-text-secondary);
  padding: 0.28rem 0.7rem;
  border-radius: var(--border-radius-md);
  background: var(--color-background-secondary);
  border: 1px solid var(--color-border-tertiary);
}
.topnav-syllabus:hover {
  background: var(--color-background-tertiary);
}
.topnav-user {
  font-size: 0.85rem;
  color: var(--color-text-tertiary);
  padding-right: 0.5rem;
}
.topnav-form { display: inline-block; margin: 0; }

.topnav .theme-toggle {
  position: static;
  background: transparent;
  border: 1px solid var(--color-border-tertiary);
}

/* -- Area tiles grid -- */
.area-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(240px, 1fr));
  gap: 1rem; margin: 1.5rem 0 2rem;
}
.area-tile {
  border: 1px solid var(--color-border-tertiary);
  background: var(--color-background-primary);
  padding: 1.3rem 1.2rem;
  border-radius: var(--border-radius-lg);
  text-align: left;
  cursor: pointer;
  transition: transform 0.1s ease, box-shadow 0.15s, border-color 0.15s;
  font: inherit; font-family: var(--font-sans);
  color: var(--color-text-primary);
}
.area-tile:hover {
  transform: translateY(-2px);
  box-shadow: 0 4px 14px rgba(0, 0, 0, 0.06);
  border-color: var(--color-border-primary);
}
.area-tile-code {
  display: inline-block;
  font-size: 0.72rem;
  font-weight: 700;
  color: var(--color-text-tertiary);
  margin-bottom: 0.45rem;
  letter-spacing: 0.1em;
  text-transform: uppercase;
}
.area-tile-name {
  font-size: 1.1rem;
  font-weight: 600;
  margin-bottom: 0.3rem;
  color: var(--color-text-primary);
}
.area-tile-count {
  font-size: 0.82rem;
  color: var(--color-text-tertiary);
}

/* -- Area view header -- */
.area-view-header {
  display: flex;
  align-items: center;
  gap: 1rem;
  margin: 1rem 0 1rem;
  padding-bottom: 0.75rem;
  border-bottom: 1px solid var(--color-border-tertiary);
}
.area-back {
  border: 1px solid var(--color-border-tertiary);
  background: var(--color-background-primary);
  cursor: pointer;
  font: inherit; font-size: 0.88rem;
  padding: 0.4rem 0.75rem;
  border-radius: var(--border-radius-md);
  color: var(--color-text-secondary);
  transition: background 0.12s;
}
.area-back:hover {
  background: var(--color-background-secondary);
  color: var(--color-text-primary);
}

/* -- Per-topic chat -- */
.topic-chat {
  margin-top: 1rem;
  padding-top: 1rem;
  border-top: 1px dashed var(--color-border-tertiary);
}
.chat-open {
  border: 1px solid var(--color-border-tertiary);
  background: var(--color-background-secondary);
  padding: 0.45rem 0.9rem;
  border-radius: var(--border-radius-md);
  cursor: pointer;
  font: inherit; font-size: 0.86rem;
  color: var(--color-text-secondary);
  transition: background 0.12s;
}
.chat-open:hover {
  background: var(--color-background-tertiary);
  color: var(--color-text-primary);
}
.chat-panel { margin-top: 0.75rem; }
.chat-log {
  display: flex; flex-direction: column;
  gap: 0.5rem;
  max-height: 340px; overflow-y: auto;
  margin-bottom: 0.75rem;
  padding: 0.2rem;
}
.chat-msg {
  padding: 0.55rem 0.85rem;
  border-radius: var(--border-radius-lg);
  font-size: 0.9rem;
  line-height: 1.5;
  max-width: 88%;
}
.chat-msg-user {
  align-self: flex-end;
  background: var(--color-text-primary);
  color: var(--color-background-primary);
  border-bottom-right-radius: 4px;
}
.chat-msg-assistant {
  align-self: flex-start;
  background: var(--color-background-secondary);
  color: var(--color-text-primary);
  border: 1px solid var(--color-border-tertiary);
  border-bottom-left-radius: 4px;
}
.chat-msg-thinking {
  font-style: italic;
  color: var(--color-text-tertiary);
}
.chat-form { display: flex; gap: 0.5rem; }
.chat-input {
  flex: 1;
  padding: 0.55rem 0.85rem;
  border-radius: var(--border-radius-md);
  border: 1px solid var(--color-border-tertiary);
  background: var(--color-background-primary);
  color: var(--color-text-primary);
  font: inherit;
}
.chat-input:focus {
  outline: none;
  border-color: var(--color-border-primary);
}
.chat-hint {
  margin-top: 0.4rem;
  font-size: 0.76rem;
  color: var(--color-text-tertiary);
}

/* -- Centred auth card (login page) -- */
.auth-shell {
  min-height: calc(100vh - 80px);
  display: flex;
  align-items: center;
  justify-content: center;
  padding: 2rem 1rem;
}
.auth-card {
  width: 100%; max-width: 420px;
  background: var(--color-background-primary);
  border: 1px solid var(--color-border-tertiary);
  border-radius: var(--border-radius-xl);
  padding: 2rem;
  box-shadow: 0 2px 16px rgba(0, 0, 0, 0.04);
}
.auth-card h1 {
  margin: 0 0 0.35rem;
  font-size: 1.4rem;
}
.auth-card .auth-subtitle {
  margin: 0 0 1.5rem;
  color: var(--color-text-tertiary);
  font-size: 0.92rem;
}
.auth-field {
  display: block; margin-bottom: 1rem;
  font-size: 0.88rem;
  color: var(--color-text-secondary);
}
.auth-field input {
  display: block;
  width: 100%;
  margin-top: 0.3rem;
  padding: 0.65rem 0.8rem;
  border: 1px solid var(--color-border-tertiary);
  border-radius: var(--border-radius-md);
  background: var(--color-background-primary);
  color: var(--color-text-primary);
  font: inherit; font-size: 0.95rem;
  box-sizing: border-box;
}
.auth-field input:focus {
  outline: none;
  border-color: var(--color-border-primary);
}
.auth-submit {
  display: block; width: 100%;
  padding: 0.7rem 1rem;
  background: var(--color-text-primary);
  color: var(--color-background-primary);
  border: 0;
  border-radius: var(--border-radius-md);
  font: inherit; font-size: 0.95rem; font-weight: 600;
  cursor: pointer;
  transition: opacity 0.12s;
}
.auth-submit:hover { opacity: 0.88; }

/* -- Flash messages (top-nav-aware) -- */
.flash-stack {
  position: sticky; top: 56px; z-index: 40;
  padding: 0.5rem 2rem;
}
.flash {
  padding: 0.6rem 1rem;
  border-radius: var(--border-radius-md);
  margin-bottom: 0.5rem;
  font-size: 0.9rem;
}
.flash-error   { background: var(--color-background-danger);  color: var(--color-text-danger);  border: 1px solid var(--color-border-tertiary); }
.flash-success { background: var(--color-background-success); color: var(--color-text-success); border: 1px solid var(--color-border-tertiary); }
.flash-info    { background: var(--color-background-info);    color: var(--color-text-info);    border: 1px solid var(--color-border-tertiary); }

/* -- Full-width topnav (override body's 2rem top padding) -- */
body { padding-top: 0; }
.topnav { margin: 0 -1rem 1.5rem; }

/* -- Syllabus switcher dropdown in topnav -- */
.syll-dropdown {
  position: relative;
}
.syll-dropdown summary {
  list-style: none;
  cursor: pointer;
  display: inline-flex;
  align-items: center;
  gap: 0.35rem;
}
.syll-dropdown summary::-webkit-details-marker { display: none; }
.syll-caret {
  font-size: 0.7rem;
  color: var(--color-text-tertiary);
  transition: transform 0.15s;
}
.syll-dropdown[open] .syll-caret { transform: rotate(180deg); }

.syll-menu {
  position: absolute;
  top: calc(100% + 6px);
  right: 0;
  min-width: 320px;
  background: var(--color-background-primary);
  border: 1px solid var(--color-border-tertiary);
  border-radius: var(--border-radius-lg);
  box-shadow: 0 8px 24px rgba(0, 0, 0, 0.08);
  padding: 0.3rem;
  z-index: 60;
}
.syll-option { margin: 0; display: block; }
.syll-item {
  width: 100%;
  text-align: left;
  padding: 0.55rem 0.75rem;
  border: 0;
  border-radius: var(--border-radius-md);
  background: transparent;
  cursor: pointer;
  font: inherit;
  color: var(--color-text-primary);
  display: flex;
  align-items: baseline;
  gap: 0.7rem;
  transition: background 0.12s;
}
.syll-item:hover {
  background: var(--color-background-secondary);
}
.syll-item.active {
  background: var(--color-background-info);
  color: var(--color-text-info);
}
.syll-code {
  font-weight: 700;
  font-size: 0.82rem;
  min-width: 44px;
  letter-spacing: 0.02em;
}
.syll-name {
  font-size: 0.88rem;
  color: var(--color-text-secondary);
}
.syll-item.active .syll-name { color: inherit; }
.syll-empty {
  padding: 0.6rem 0.8rem;
  font-size: 0.85rem;
  color: var(--color-text-tertiary);
}