/* ══════════════════════════════════════════
   StoicGPT — Design System
   ══════════════════════════════════════════ */

@import url('https://fonts.googleapis.com/css2?family=Cinzel:wght@400;500;600;700&family=EB+Garamond:ital,wght@0,400;0,500;0,600;1,400;1,500&display=swap');

*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }

:root {
  --bg:           #0a0908;
  --bg-alt:       #0e0c0a;
  --surface:      #141210;
  --surface-alt:  #1a1714;
  --border:       #2e2820;
  --border-light: #3a3228;

  --gold:         #c9a84c;
  --gold-bright:  #e0c060;
  --gold-dim:     #7a6530;
  --gold-subtle:  #2a2210;

  --bronze:       #a0714a;
  --bronze-dim:   #6b4a30;

  --text:         #d4c9b0;
  --text-bright:  #ede4d0;
  --text-dim:     #7a7060;
  --text-muted:   #504a3e;

  --font-display: 'Cinzel', serif;
  --font-body:    'EB Garamond', serif;
}

html {
  scroll-behavior: smooth;
  font-size: 17px;
}

body {
  background: var(--bg);
  color: var(--text);
  font-family: var(--font-body);
  line-height: 1.7;
  overflow-x: hidden;
}

a { color: var(--gold); text-decoration: none; transition: color 0.2s; }
a:hover { color: var(--gold-bright); }

/* ── Nav ── */
.nav {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  z-index: 100;
  background: rgba(10, 9, 8, 0.92);
  backdrop-filter: blur(12px);
  border-bottom: 1px solid var(--border);
  transition: background 0.3s;
}

.nav-inner {
  max-width: 1100px;
  margin: 0 auto;
  padding: 0 28px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 60px;
}

.nav-logo {
  font-family: var(--font-display);
  font-size: 1.1rem;
  letter-spacing: 0.16em;
  color: var(--gold);
  font-weight: 600;
}

.nav-links {
  display: flex;
  gap: 32px;
  list-style: none;
}

.nav-links a {
  font-family: var(--font-display);
  font-size: 0.68rem;
  letter-spacing: 0.14em;
  color: var(--text-dim);
  transition: color 0.2s;
  text-transform: uppercase;
}

.nav-links a:hover,
.nav-links a.active { color: var(--gold); }

.nav-hamburger {
  display: none;
  background: none;
  border: none;
  color: var(--text-dim);
  font-size: 1.4rem;
  cursor: pointer;
}

/* ── Page container ── */
.page {
  display: none;
  min-height: 100vh;
  padding-top: 60px;
}

.page.active { display: block; }

/* ── Section ── */
.section {
  max-width: 1000px;
  margin: 0 auto;
  padding: 80px 28px;
}

.section-label {
  font-family: var(--font-display);
  font-size: 0.7rem;
  letter-spacing: 0.2em;
  color: var(--gold-dim);
  text-transform: uppercase;
  margin-bottom: 12px;
}

.section-title {
  font-family: var(--font-display);
  font-size: 1.8rem;
  letter-spacing: 0.08em;
  color: var(--text-bright);
  margin-bottom: 20px;
}

.section-text {
  max-width: 650px;
  color: var(--text);
  font-size: 1.05rem;
  line-height: 1.85;
}

/* ── Divider ── */
.ornament-divider {
  text-align: center;
  color: var(--text-muted);
  font-size: 1.2rem;
  letter-spacing: 0.5em;
  padding: 40px 0;
}

/* ══════════════════════════════════════════
   HOME — Hero
   ══════════════════════════════════════════ */

.hero {
  min-height: 100vh;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  text-align: center;
  padding: 60px 28px 80px;
  position: relative;
  overflow: hidden;
}

.hero::before {
  content: '';
  position: absolute;
  inset: 0;
  background: radial-gradient(ellipse at 50% 40%, rgba(201, 168, 76, 0.06) 0%, transparent 70%);
  pointer-events: none;
}

.hero-ornament {
  font-size: 3rem;
  color: var(--gold-dim);
  margin-bottom: 24px;
  opacity: 0;
  transform: translateY(20px);
  animation: fadeUp 1s 0.2s forwards;
}

.hero h1 {
  font-family: var(--font-display);
  font-size: clamp(2.4rem, 6vw, 4rem);
  letter-spacing: 0.18em;
  color: var(--gold);
  margin-bottom: 16px;
  opacity: 0;
  transform: translateY(20px);
  animation: fadeUp 1s 0.4s forwards;
}

.hero-subtitle {
  font-family: var(--font-body);
  font-size: 1.15rem;
  font-style: italic;
  color: var(--text-dim);
  max-width: 500px;
  line-height: 1.8;
  margin-bottom: 40px;
  opacity: 0;
  transform: translateY(20px);
  animation: fadeUp 1s 0.6s forwards;
}

.hero-cta {
  display: inline-block;
  font-family: var(--font-display);
  font-size: 0.75rem;
  letter-spacing: 0.16em;
  color: var(--gold);
  border: 1px solid var(--gold-dim);
  padding: 14px 36px;
  border-radius: 2px;
  transition: background 0.3s, color 0.3s;
  opacity: 0;
  transform: translateY(20px);
  animation: fadeUp 1s 0.8s forwards;
  position: relative;
  z-index: 2;
  margin-bottom: 60px;
}

.hero-cta:hover {
  background: var(--gold-dim);
  color: var(--bg);
}

.hero-scroll-hint {
  position: absolute;
  bottom: 24px;
  color: var(--text-muted);
  font-size: 0.75rem;
  letter-spacing: 0.1em;
  opacity: 0;
  animation: fadeUp 1s 1.2s forwards;
  pointer-events: none;
}

.hero-scroll-hint::after {
  content: '';
  display: block;
  width: 1px;
  height: 30px;
  background: var(--border);
  margin: 8px auto 0;
  animation: pulse 2s infinite;
}

@keyframes fadeUp {
  to { opacity: 1; transform: translateY(0); }
}

@keyframes pulse {
  0%, 100% { opacity: 0.3; }
  50% { opacity: 0.8; }
}

/* ── Home: Project overview cards ── */
.overview-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
  gap: 20px;
  margin-top: 32px;
}

.overview-card {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: 3px;
  padding: 28px 24px;
  transition: border-color 0.3s, transform 0.3s;
}

.overview-card:hover {
  border-color: var(--gold-dim);
  transform: translateY(-2px);
}

.overview-card .card-icon {
  font-size: 1.6rem;
  margin-bottom: 14px;
}

.overview-card h3 {
  font-family: var(--font-display);
  font-size: 0.85rem;
  letter-spacing: 0.1em;
  color: var(--text-bright);
  margin-bottom: 10px;
}

.overview-card p {
  font-size: 0.92rem;
  color: var(--text-dim);
  line-height: 1.7;
}

/* ── Home: Stats bar ── */
.stats-bar {
  display: flex;
  justify-content: center;
  gap: 48px;
  flex-wrap: wrap;
  padding: 48px 0;
  border-top: 1px solid var(--border);
  border-bottom: 1px solid var(--border);
  margin: 48px 0;
}

.stat-item {
  text-align: center;
}

.stat-value {
  font-family: var(--font-display);
  font-size: 1.6rem;
  color: var(--gold);
  letter-spacing: 0.06em;
}

.stat-label {
  font-size: 0.75rem;
  color: var(--text-dim);
  letter-spacing: 0.1em;
  margin-top: 4px;
}

/* ══════════════════════════════════════════
   ARCHITECTURE
   ══════════════════════════════════════════ */

.arch-pipeline {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 0;
  padding: 40px 0;
  overflow-x: auto;
  flex-wrap: wrap;
  row-gap: 12px;
}

.arch-block {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: 3px;
  padding: 16px 14px;
  text-align: center;
  min-width: 110px;
  cursor: pointer;
  transition: border-color 0.3s, transform 0.3s, box-shadow 0.3s;
  position: relative;
  flex-shrink: 1;
}

.arch-block:hover {
  border-color: var(--gold);
  transform: translateY(-4px);
  box-shadow: 0 8px 24px rgba(201, 168, 76, 0.08);
}

.arch-block.active {
  border-color: var(--gold);
  box-shadow: 0 0 20px rgba(201, 168, 76, 0.1);
}

.arch-block h4 {
  font-family: var(--font-display);
  font-size: 0.7rem;
  letter-spacing: 0.12em;
  color: var(--gold);
  margin-bottom: 6px;
}

.arch-block p {
  font-size: 0.8rem;
  color: var(--text-dim);
}

.arch-arrow {
  color: var(--gold-dim);
  font-size: 1.4rem;
  padding: 0 8px;
  flex-shrink: 0;
}

.arch-detail {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: 3px;
  padding: 32px;
  margin-top: 32px;
  display: none;
}

.arch-detail.active { display: block; }

.arch-detail h3 {
  font-family: var(--font-display);
  font-size: 1rem;
  letter-spacing: 0.1em;
  color: var(--gold);
  margin-bottom: 16px;
}

.arch-detail p {
  color: var(--text);
  line-height: 1.8;
  margin-bottom: 12px;
}

.arch-detail code {
  background: var(--bg);
  color: var(--gold);
  padding: 2px 8px;
  border-radius: 2px;
  font-size: 0.88rem;
}

.arch-detail .detail-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 16px;
  margin-top: 16px;
}

.arch-detail .detail-item {
  background: var(--bg);
  border: 1px solid var(--border);
  padding: 14px 16px;
  border-radius: 2px;
}

.arch-detail .detail-item .label {
  font-size: 0.72rem;
  letter-spacing: 0.1em;
  color: var(--text-dim);
  font-family: var(--font-display);
}

.arch-detail .detail-item .value {
  color: var(--text-bright);
  margin-top: 4px;
}

/* ── Flow animation ── */
.flow-particle {
  position: absolute;
  width: 6px;
  height: 6px;
  background: var(--gold);
  border-radius: 50%;
  opacity: 0;
  box-shadow: 0 0 8px rgba(201, 168, 76, 0.5);
}

/* ══════════════════════════════════════════
   STOICISM PAGE
   ══════════════════════════════════════════ */

.philosophy-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
  gap: 24px;
  margin-top: 32px;
}

.philosopher-card {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: 3px;
  padding: 32px 28px;
  transition: border-color 0.3s;
}

.philosopher-card:hover { border-color: var(--gold-dim); }

.philosopher-card h3 {
  font-family: var(--font-display);
  font-size: 1rem;
  letter-spacing: 0.08em;
  color: var(--gold);
  margin-bottom: 4px;
}

.philosopher-card .dates {
  font-size: 0.82rem;
  color: var(--text-dim);
  font-style: italic;
  margin-bottom: 14px;
}

.philosopher-card p {
  color: var(--text);
  line-height: 1.8;
  font-size: 0.95rem;
}

.quote-block {
  background: var(--surface);
  border-left: 2px solid var(--gold-dim);
  padding: 20px 24px;
  margin: 24px 0;
  font-style: italic;
  color: var(--text);
  line-height: 1.85;
}

.quote-block cite {
  display: block;
  margin-top: 10px;
  font-style: normal;
  font-size: 0.85rem;
  color: var(--gold-dim);
}

.principles-list {
  list-style: none;
  margin-top: 24px;
}

.principles-list li {
  padding: 16px 0;
  border-bottom: 1px solid var(--border);
  display: flex;
  gap: 16px;
  align-items: baseline;
}

.principles-list li:last-child { border-bottom: none; }

.principles-list .num {
  font-family: var(--font-display);
  font-size: 0.8rem;
  color: var(--gold-dim);
  letter-spacing: 0.1em;
  min-width: 24px;
}

.principles-list .content strong {
  color: var(--text-bright);
}

/* ══════════════════════════════════════════
   BIBLIOGRAPHY
   ══════════════════════════════════════════ */

.bib-list {
  list-style: none;
  margin-top: 24px;
}

.bib-list li {
  padding: 18px 0;
  border-bottom: 1px solid var(--border);
  line-height: 1.8;
}

.bib-list li:last-child { border-bottom: none; }

.bib-list .bib-title {
  color: var(--text-bright);
  font-style: italic;
}

.bib-list .bib-author {
  color: var(--gold);
}

.bib-list .bib-detail {
  font-size: 0.88rem;
  color: var(--text-dim);
  margin-top: 4px;
}

/* ══════════════════════════════════════════
   ABOUT
   ══════════════════════════════════════════ */

.about-layout {
  display: flex;
  gap: 48px;
  align-items: flex-start;
  margin-top: 32px;
}

.about-photo {
  width: 180px;
  height: 180px;
  border-radius: 50%;
  border: 2px solid var(--border);
  background: var(--surface);
  flex-shrink: 0;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 3rem;
  color: var(--gold-dim);
}

.about-info h2 {
  font-family: var(--font-display);
  font-size: 1.5rem;
  color: var(--text-bright);
  letter-spacing: 0.08em;
  margin-bottom: 8px;
}

.about-info .about-role {
  color: var(--gold-dim);
  font-style: italic;
  margin-bottom: 18px;
}

.about-info p {
  line-height: 1.85;
  margin-bottom: 20px;
}

.about-links {
  display: flex;
  gap: 16px;
}

.about-links a {
  font-family: var(--font-display);
  font-size: 0.72rem;
  letter-spacing: 0.12em;
  color: var(--gold);
  border: 1px solid var(--gold-dim);
  padding: 10px 20px;
  border-radius: 2px;
  transition: background 0.2s, color 0.2s;
}

.about-links a:hover {
  background: var(--gold-dim);
  color: var(--bg);
}

/* ══════════════════════════════════════════
   CHAT (embedded)
   ══════════════════════════════════════════ */

.chat-container {
  max-width: 820px;
  margin: 0 auto;
  height: calc(100vh - 60px);
  display: flex;
  flex-direction: column;
}

.chat-tabs {
  display: flex;
  justify-content: center;
  gap: 0;
  border-bottom: 1px solid var(--border);
  padding-top: 20px;
  flex-shrink: 0;
}

.chat-tab-btn {
  background: none;
  border: none;
  color: var(--text-dim);
  font-family: var(--font-display);
  font-size: 0.78rem;
  letter-spacing: 0.14em;
  padding: 12px 28px;
  cursor: pointer;
  border-bottom: 2px solid transparent;
  transition: color 0.3s, border-color 0.3s;
}

.chat-tab-btn:hover { color: var(--text); }
.chat-tab-btn.active[data-tab="oracle"] { color: var(--gold); border-bottom-color: var(--gold); }
.chat-tab-btn.active[data-tab="forge"]  { color: var(--bronze); border-bottom-color: var(--bronze); }

.chat-tab-desc {
  text-align: center;
  padding: 10px 20px 0;
  font-size: 0.78rem;
  color: var(--text-dim);
  font-style: italic;
  flex-shrink: 0;
}

.chat-model-stats {
  display: none;
  justify-content: center;
  gap: 28px;
  padding: 4px 20px 6px;
  font-size: 0.72rem;
  color: var(--text-dim);
}
.chat-model-stats.visible { display: flex; }
.chat-model-stats span { color: var(--bronze); font-weight: 500; }

#chat-messages {
  flex: 1;
  overflow-y: auto;
  padding: 20px 20px;
  display: flex;
  flex-direction: column;
  gap: 22px;
  scrollbar-width: thin;
  scrollbar-color: var(--border) transparent;
}

.msg {
  display: flex;
  flex-direction: column;
  gap: 5px;
  max-width: 92%;
}
.msg.user  { align-self: flex-end; align-items: flex-end; }
.msg.bot   { align-self: flex-start; align-items: flex-start; }

.msg .msg-label {
  font-family: var(--font-display);
  font-size: 0.68rem;
  letter-spacing: 0.15em;
  color: var(--text-dim);
}
.msg.bot .msg-label { color: var(--gold-dim); }
.msg.bot.forge .msg-label { color: var(--bronze); }

.bubble {
  padding: 13px 18px;
  border-radius: 3px;
  line-height: 1.75;
  border: 1px solid var(--border);
  background: var(--surface);
}
.msg.user .bubble { background: var(--surface-alt); }

.cursor::after {
  content: '\25CD';
  color: var(--gold);
  animation: blink 0.9s step-end infinite;
}
.msg.bot.forge .cursor::after { color: var(--bronze); }
@keyframes blink { 50% { opacity: 0; } }

.chat-divider {
  display: flex;
  align-items: center;
  gap: 12px;
  color: var(--text-muted);
  font-size: 0.75rem;
}
.chat-divider::before, .chat-divider::after {
  content: '';
  flex: 1;
  height: 1px;
  background: var(--border);
}

.chat-empty {
  flex: 1;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  gap: 14px;
  color: var(--text-dim);
  font-style: italic;
  text-align: center;
  padding: 40px;
}
.chat-empty .ornament {
  font-size: 2.2rem;
  line-height: 1;
  color: var(--gold-dim);
}
.chat-empty.forge .ornament { color: var(--bronze); }

.chat-input-area {
  border-top: 1px solid var(--border);
  padding: 16px 20px 20px;
  flex-shrink: 0;
  background: var(--surface);
}

.chat-input-row {
  display: flex;
  gap: 10px;
  align-items: flex-end;
}

.chat-input-row textarea {
  flex: 1;
  background: var(--bg);
  color: var(--text);
  border: 1px solid var(--border);
  border-radius: 3px;
  padding: 11px 14px;
  font-family: var(--font-body);
  font-size: 1rem;
  resize: none;
  outline: none;
  line-height: 1.6;
  max-height: 140px;
  transition: border-color 0.2s;
}
.chat-input-row textarea:focus { border-color: var(--gold-dim); }
.chat-input-row textarea.forge-focus:focus { border-color: var(--bronze); }
.chat-input-row textarea::placeholder { color: var(--text-dim); font-style: italic; }

.chat-send-btn {
  background: transparent;
  border: 1px solid var(--gold-dim);
  color: var(--gold);
  font-family: var(--font-display);
  font-size: 0.73rem;
  letter-spacing: 0.12em;
  padding: 10px 18px;
  border-radius: 3px;
  cursor: pointer;
  transition: background 0.2s, color 0.2s;
  white-space: nowrap;
}
.chat-send-btn:hover { background: var(--gold-dim); color: var(--bg); }
.chat-send-btn.forge { border-color: var(--bronze); color: var(--bronze); }
.chat-send-btn.forge:hover { background: var(--bronze); color: var(--bg); }
.chat-send-btn:disabled { opacity: 0.4; cursor: not-allowed; }

.chat-hint {
  margin-top: 8px;
  font-size: 0.75rem;
  color: var(--text-dim);
  text-align: center;
  font-style: italic;
}

/* ── Footer ── */
.footer {
  text-align: center;
  padding: 40px 28px;
  border-top: 1px solid var(--border);
  font-size: 0.82rem;
  color: var(--text-muted);
}

/* ── Responsive ── */
@media (max-width: 768px) {
  .nav-links { display: none; }
  .nav-links.open {
    display: flex;
    flex-direction: column;
    position: absolute;
    top: 60px;
    left: 0;
    right: 0;
    background: rgba(10, 9, 8, 0.98);
    padding: 20px 28px;
    gap: 16px;
    border-bottom: 1px solid var(--border);
  }
  .nav-hamburger { display: block; }
  .about-layout { flex-direction: column; align-items: center; text-align: center; }
  .about-links { justify-content: center; }
  .arch-pipeline { flex-direction: column; align-items: stretch; }
  .arch-arrow { transform: rotate(90deg); text-align: center; padding: 4px 0; }
  .arch-detail .detail-grid { grid-template-columns: 1fr; }
  .stats-bar { gap: 28px; }
}