/* ===== Reset & Base ===== */
*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }

:root {
  --sidebar-w: 240px;
  --color-bg: #ffffff;
  --color-bg-alt: #f8f9fa;
  --color-text: #1a1a2e;
  --color-text-muted: #6b7280;
  --color-primary: #4f46e5;
  --color-primary-light: #e0e7ff;
  --color-accent: #10b981;
  --color-border: #e5e7eb;
  --font-sans: 'Inter', -apple-system, BlinkMacSystemFont, sans-serif;
  --font-mono: 'JetBrains Mono', monospace;
  --radius: 8px;
  --shadow: 0 1px 3px rgba(0,0,0,0.08);
}

html { font-size: 16px; scroll-behavior: smooth; }
body {
  font-family: var(--font-sans);
  color: var(--color-text);
  background: var(--color-bg);
  line-height: 1.65;
  display: flex;
  min-height: 100vh;
}

a { color: var(--color-primary); text-decoration: none; }
a:hover { text-decoration: underline; }

/* ===== Sidebar ===== */
.sidebar {
  position: fixed;
  top: 0; left: 0;
  width: var(--sidebar-w);
  height: 100vh;
  background: #fafafa;
  border-right: 1px solid var(--color-border);
  display: flex;
  flex-direction: column;
  z-index: 100;
  overflow-y: auto;
}

.sidebar-header {
  padding: 1.5rem 1.25rem 1rem;
  display: flex;
  align-items: center;
  justify-content: space-between;
}

.sidebar-logo {
  font-size: 1.25rem;
  font-weight: 700;
  color: var(--color-primary);
  letter-spacing: -0.02em;
}
.sidebar-logo:hover { text-decoration: none; }

.sidebar-toggle { display: none; background: none; border: none; cursor: pointer; }
.sidebar-toggle span {
  display: block; width: 20px; height: 2px;
  background: var(--color-text); margin: 4px 0;
  transition: 0.2s;
}

.sidebar-nav {
  list-style: none;
  padding: 0 0.75rem;
  flex: 1;
}

.nav-item { margin-bottom: 2px; }

.nav-link {
  display: block;
  padding: 0.5rem 0.75rem;
  border-radius: 6px;
  font-size: 0.875rem;
  font-weight: 500;
  color: var(--color-text);
  transition: background 0.15s;
}
.nav-link:hover { background: var(--color-primary-light); text-decoration: none; }
.nav-item.active > .nav-link {
  background: var(--color-primary-light);
  color: var(--color-primary);
}

.nav-children {
  list-style: none;
  padding-left: 1rem;
}
.nav-child a {
  display: block;
  padding: 0.3rem 0.75rem;
  font-size: 0.8125rem;
  color: var(--color-text-muted);
  border-radius: 4px;
}
.nav-child a:hover { color: var(--color-primary); text-decoration: none; }
.nav-child.active a { color: var(--color-primary); font-weight: 500; }

.sidebar-footer {
  padding: 1rem 1.25rem;
  border-top: 1px solid var(--color-border);
  display: flex;
  gap: 1rem;
}
.sidebar-link {
  font-size: 0.8125rem;
  color: var(--color-text-muted);
}

/* ===== Page Wrap ===== */
.page-wrap {
  margin-left: var(--sidebar-w);
  flex: 1;
  display: flex;
  flex-direction: column;
  min-height: 100vh;
}

/* ===== Main Content ===== */
.main-content {
  flex: 1;
}

.container {
  max-width: 75%;
  margin: 0 auto;
  padding: 3rem 2rem;
}

.container-wide {
  max-width: 85%;
  margin: 0 auto;
  padding: 3rem 2rem;
}

/* ===== Typography ===== */
h1, h2, h3, h4 { line-height: 1.3; letter-spacing: -0.01em; }
h1 { font-size: 2rem; font-weight: 700; margin-bottom: 0.75rem; }
h2 { font-size: 1.5rem; font-weight: 600; margin: 2rem 0 0.75rem; }
h3 { font-size: 1.125rem; font-weight: 600; margin: 1.5rem 0 0.5rem; }
p { margin-bottom: 1rem; }

.subtitle {
  font-size: 1.125rem;
  color: var(--color-text-muted);
  margin-bottom: 2rem;
}

/* ===== Hero (Home) ===== */
.hero {
  text-align: center;
  padding: 5rem 2rem 3rem;
  background: linear-gradient(135deg, #f0f0ff 0%, #e8faf0 100%);
  border-bottom: 1px solid var(--color-border);
}

.hero h1 {
  font-size: 2.5rem;
  margin-bottom: 0.5rem;
}

.hero .tagline {
  font-size: 1.125rem;
  color: var(--color-text-muted);
  max-width: 800px;
  margin: 0 auto 2.5rem;
  line-height: 1.7;
}

.cta-group {
  display: flex;
  gap: 1rem;
  justify-content: center;
  flex-wrap: wrap;
}

.btn {
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
  padding: 0.75rem 1.75rem;
  border-radius: var(--radius);
  font-size: 0.9375rem;
  font-weight: 600;
  transition: all 0.15s;
  border: none;
  cursor: pointer;
}
.btn:hover { text-decoration: none; transform: translateY(-1px); }

.btn-primary {
  background: var(--color-primary);
  color: #fff;
}
.btn-primary:hover { background: #4338ca; }

.btn-accent {
  background: var(--color-accent);
  color: #fff;
}
.btn-accent:hover { background: #059669; }

.btn-outline {
  background: transparent;
  color: var(--color-primary);
  border: 2px solid var(--color-primary);
}
.btn-outline:hover { background: var(--color-primary-light); }

/* ===== Home Sections ===== */
.home-section {
  padding: 3rem 2rem;
  max-width: 75%;
  margin: 0 auto;
}

.feature-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(220px, 1fr));
  gap: 1.5rem;
  margin-top: 1.5rem;
}

.feature-card {
  padding: 1.5rem;
  background: var(--color-bg);
  border: 1px solid var(--color-border);
  border-radius: var(--radius);
}

.feature-card h3 {
  margin: 0 0 0.5rem;
  font-size: 1rem;
}

.feature-card p {
  font-size: 0.875rem;
  color: var(--color-text-muted);
  margin: 0;
}

/* ===== Research ===== */
.paper-header {
  border-bottom: 1px solid var(--color-border);
  padding-bottom: 1.5rem;
  margin-bottom: 2rem;
}

.paper-header h1 { font-size: 1.75rem; }

.paper-meta {
  display: flex;
  gap: 1.5rem;
  flex-wrap: wrap;
  margin-top: 0.75rem;
  font-size: 0.875rem;
  color: var(--color-text-muted);
}

.abstract-box {
  background: var(--color-bg-alt);
  border-left: 4px solid var(--color-primary);
  padding: 1.5rem;
  border-radius: 0 var(--radius) var(--radius) 0;
  margin: 1.5rem 0;
}

.abstract-box p {
  margin: 0;
  font-size: 0.9375rem;
  line-height: 1.75;
}

.dimensions-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 1rem;
  margin: 1.5rem 0;
}

.dimension-card {
  padding: 1.25rem;
  border: 1px solid var(--color-border);
  border-radius: var(--radius);
  text-align: center;
}

.dimension-card .icon { font-size: 1.5rem; margin-bottom: 0.5rem; }
.dimension-card h4 { font-size: 0.875rem; margin-bottom: 0.25rem; }
.dimension-card p { font-size: 0.8125rem; color: var(--color-text-muted); margin: 0; }

/* ===== Method page ===== */
.phase-steps {
  list-style: none;
  counter-reset: step;
  padding: 0;
  margin: 1.5rem 0;
}

.phase-steps li {
  counter-increment: step;
  display: flex;
  gap: 1rem;
  align-items: flex-start;
  padding: 1rem 0;
  border-bottom: 1px solid var(--color-border);
}

.phase-steps li:last-child { border-bottom: none; }

.phase-steps li::before {
  content: counter(step);
  flex-shrink: 0;
  width: 2rem;
  height: 2rem;
  display: flex;
  align-items: center;
  justify-content: center;
  background: var(--color-primary);
  color: #fff;
  border-radius: 50%;
  font-size: 0.875rem;
  font-weight: 700;
}

.step-label {
  font-weight: 600;
  font-size: 0.9375rem;
  margin-bottom: 0.25rem;
}

.step-desc {
  font-size: 0.875rem;
  color: var(--color-text-muted);
  line-height: 1.6;
}

.callout {
  background: var(--color-primary-light);
  border-left: 4px solid var(--color-primary);
  padding: 1rem 1.25rem;
  border-radius: 0 var(--radius) var(--radius) 0;
  margin: 1.5rem 0;
  font-size: 0.9375rem;
}

.config-card {
  background: var(--color-bg-alt);
  border: 1px solid var(--color-border);
  border-radius: var(--radius);
  padding: 1.25rem 1.5rem;
  margin: 1.5rem 0;
}

.config-card h4 {
  margin: 0 0 0.75rem;
  font-size: 0.9375rem;
}

.config-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 0.5rem;
}

.config-item {
  display: flex;
  justify-content: space-between;
  padding: 0.375rem 0;
  font-size: 0.875rem;
}

.config-role { color: var(--color-text-muted); }
.config-value { font-weight: 600; font-family: var(--font-mono); font-size: 0.8125rem; }

.config-note {
  margin: 0.75rem 0 0;
  font-size: 0.8125rem;
  color: var(--color-text-muted);
}

/* ===== Formula toggles ===== */
details.formula-toggle {
  margin: 1rem 0;
  border: 1px solid var(--color-border);
  border-radius: var(--radius);
  overflow: hidden;
}

details.formula-toggle summary {
  padding: 0.625rem 1rem;
  background: var(--color-bg-alt);
  cursor: pointer;
  font-size: 0.875rem;
  font-weight: 500;
  color: var(--color-primary);
  list-style: none;
  display: flex;
  align-items: center;
  gap: 0.5rem;
}

details.formula-toggle summary::-webkit-details-marker { display: none; }

details.formula-toggle summary::before {
  content: '\25B6';
  font-size: 0.625rem;
  transition: transform 0.2s;
}

details.formula-toggle[open] summary::before {
  transform: rotate(90deg);
}

details.formula-toggle .formula-content {
  padding: 1.25rem 1.5rem;
  font-size: 0.9375rem;
  line-height: 1.75;
  border-top: 1px solid var(--color-border);
}

details.formula-toggle .formula-content p {
  margin-bottom: 0.75rem;
}

details.formula-toggle .formula-content p:last-child {
  margin-bottom: 0;
}

.page-nav {
  display: flex;
  gap: 1rem;
  margin-top: 2.5rem;
  padding-top: 1.5rem;
  border-top: 1px solid var(--color-border);
}

/* ===== Method / Results figures ===== */
.figure-row {
  display: flex;
  gap: 1.5rem;
  align-items: flex-start;
  margin: 1.5rem 0;
}
.figure-row figure {
  flex: 1;
  min-width: 0;
  margin: 0;
}

figure {
  margin: 1.5rem 0;
}
figure img {
  max-width: 100%;
  border-radius: var(--radius);
  border: 1px solid var(--color-border);
}
figcaption {
  margin-top: 0.5rem;
  font-size: 0.8125rem;
  color: var(--color-text-muted);
  text-align: center;
}

table {
  width: 100%;
  border-collapse: collapse;
  font-size: 0.875rem;
  margin: 1.5rem 0;
}
th, td {
  padding: 0.625rem 0.75rem;
  border: 1px solid var(--color-border);
  text-align: left;
}
th { background: var(--color-bg-alt); font-weight: 600; }

/* ===== Demo ===== */
.demo-tabs {
  display: flex;
  border-bottom: 2px solid var(--color-border);
  margin-bottom: 1.5rem;
}

.demo-tab {
  padding: 0.75rem 1.5rem;
  font-size: 0.9375rem;
  font-weight: 500;
  background: none;
  border: none;
  cursor: pointer;
  color: var(--color-text-muted);
  border-bottom: 2px solid transparent;
  margin-bottom: -2px;
  transition: 0.15s;
}
.demo-tab:hover { color: var(--color-text); }
.demo-tab.active {
  color: var(--color-primary);
  border-bottom-color: var(--color-primary);
}

.demo-panel { display: none; }
.demo-panel.active { display: block; }

.demo-description {
  margin-bottom: 1.5rem;
  padding: 1rem 1.25rem;
  background: var(--color-bg-alt);
  border-radius: var(--radius);
  font-size: 0.9375rem;
}

/* Chat UI */
.chat-container {
  border: 1px solid var(--color-border);
  border-radius: var(--radius);
  overflow: hidden;
  background: #fff;
}

.chat-header {
  padding: 0.75rem 1rem;
  background: var(--color-bg-alt);
  border-bottom: 1px solid var(--color-border);
  display: flex;
  justify-content: space-between;
  align-items: center;
}

.chat-header h4 { margin: 0; font-size: 0.875rem; }

.chat-progress {
  font-size: 0.75rem;
  color: var(--color-text-muted);
}

.chat-messages {
  height: 400px;
  overflow-y: auto;
  padding: 1rem;
  display: flex;
  flex-direction: column;
  gap: 0.75rem;
}

.chat-msg {
  max-width: 80%;
  padding: 0.625rem 0.875rem;
  border-radius: 12px;
  font-size: 0.875rem;
  line-height: 1.5;
  word-wrap: break-word;
}

.chat-msg.system {
  align-self: flex-start;
  background: var(--color-bg-alt);
  border: 1px solid var(--color-border);
}

.chat-msg.user {
  align-self: flex-end;
  background: var(--color-primary);
  color: #fff;
}

.chat-msg.info {
  align-self: center;
  background: var(--color-primary-light);
  color: var(--color-primary);
  font-size: 0.8125rem;
  text-align: center;
}

.chat-typing {
  align-self: flex-start;
  display: flex;
  gap: 4px;
  padding: 0.625rem 0.875rem;
}
.chat-typing span {
  width: 6px; height: 6px;
  background: var(--color-text-muted);
  border-radius: 50%;
  animation: bounce 1.2s infinite;
}
.chat-typing span:nth-child(2) { animation-delay: 0.15s; }
.chat-typing span:nth-child(3) { animation-delay: 0.3s; }

@keyframes bounce {
  0%, 60%, 100% { transform: translateY(0); }
  30% { transform: translateY(-6px); }
}

/* Agent terminal log viewer */
.agent-terminal {
  border: 1px solid #2d2d2d;
  border-radius: var(--radius);
  overflow: hidden;
  background: #1e1e1e;
}

.terminal-header {
  padding: 0.5rem 1rem;
  background: #2d2d2d;
  display: flex;
  justify-content: space-between;
  align-items: center;
}

.terminal-title {
  font-family: var(--font-mono);
  font-size: 0.8125rem;
  color: #a0a0a0;
}

.terminal-header .chat-progress {
  color: #7ec699;
}

.agent-terminal .terminal-body {
  height: 420px;
  overflow-y: auto;
  padding: 1rem;
  margin: 0;
  font-family: var(--font-mono);
  font-size: 0.78rem;
  line-height: 1.6;
  color: #d4d4d4;
  background: #1e1e1e;
  white-space: pre-wrap;
  word-break: break-word;
}

.chat-input {
  display: flex;
  border-top: 1px solid var(--color-border);
}

.chat-input input {
  flex: 1;
  padding: 0.75rem 1rem;
  border: none;
  font-size: 0.875rem;
  font-family: var(--font-sans);
  outline: none;
}

.chat-input button {
  padding: 0.75rem 1.25rem;
  background: var(--color-primary);
  color: #fff;
  border: none;
  font-weight: 600;
  font-size: 0.875rem;
  cursor: pointer;
  transition: background 0.15s;
}
.chat-input button:hover { background: #4338ca; }
.chat-input button:disabled { opacity: 0.5; cursor: not-allowed; }

/* Agent test form */
.agent-form {
  display: flex;
  flex-direction: column;
  gap: 1rem;
  margin-bottom: 1.5rem;
}

.form-group label {
  display: block;
  font-size: 0.8125rem;
  font-weight: 500;
  margin-bottom: 0.25rem;
}

.form-group input,
.form-group textarea,
.form-group select {
  width: 100%;
  padding: 0.5rem 0.75rem;
  border: 1px solid var(--color-border);
  border-radius: 6px;
  font-size: 0.875rem;
  font-family: var(--font-sans);
}

.form-group textarea {
  font-family: var(--font-mono);
  font-size: 0.8125rem;
  min-height: 120px;
  resize: vertical;
}

.form-row {
  display: flex;
  gap: 1rem;
}

.label-hint {
  font-weight: 400;
  color: var(--color-text-muted);
}

/* Results card */
.results-card {
  padding: 1.5rem;
  border: 1px solid var(--color-border);
  border-radius: var(--radius);
  background: #fff;
  margin-top: 1.5rem;
}
.results-card h3 { margin: 0 0 1rem; font-size: 1.125rem; }
.results-note {
  margin: 1rem 0 0;
  font-size: 0.8125rem;
  color: var(--color-text-muted);
}

.score-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 1rem;
}
.score-cell {
  text-align: center;
  padding: 1rem;
  border: 1px solid var(--color-border);
  border-radius: var(--radius);
  background: var(--color-bg-alt);
}
.score-cell .score-label {
  font-size: 0.75rem;
  font-weight: 600;
  color: var(--color-text-muted);
  text-transform: uppercase;
  letter-spacing: 0.04em;
}
.score-cell .score-value {
  font-size: 1.75rem;
  font-weight: 700;
  color: var(--color-primary);
  margin: 0.25rem 0;
}
.score-cell .score-sub {
  font-size: 0.75rem;
  color: var(--color-text-muted);
}

/* Leaderboard */
.leaderboard-controls {
  display: flex;
  gap: 1rem;
  margin-bottom: 1rem;
}
.leaderboard-filter label {
  font-size: 0.75rem;
  font-weight: 600;
  color: var(--color-text-muted);
  display: block;
  margin-bottom: 0.25rem;
}
.leaderboard-filter select {
  padding: 0.375rem 0.625rem;
  border: 1px solid var(--color-border);
  border-radius: 6px;
  font-size: 0.8125rem;
  font-family: var(--font-sans);
  background: #fff;
}

.leaderboard-table-wrap {
  overflow-x: auto;
  border: 1px solid var(--color-border);
  border-radius: var(--radius);
}

.leaderboard-table {
  width: 100%;
  border-collapse: collapse;
  font-size: 0.875rem;
}
.leaderboard-table th,
.leaderboard-table td {
  padding: 0.625rem 0.75rem;
  border-bottom: 1px solid var(--color-border);
  text-align: left;
}
.leaderboard-table th {
  background: var(--color-bg-alt);
  font-weight: 600;
  font-size: 0.8125rem;
  position: sticky;
  top: 0;
}
.leaderboard-table th.sortable {
  cursor: pointer;
  user-select: none;
}
.leaderboard-table th.sortable:hover {
  color: var(--color-primary);
}
.leaderboard-table th.active {
  color: var(--color-primary);
}
.leaderboard-table th.active::after {
  content: ' \25BC';
  font-size: 0.625rem;
}
.leaderboard-table tbody tr:hover {
  background: var(--color-primary-light);
}
.leaderboard-table .lb-rank {
  width: 2.5rem;
  text-align: center;
  font-weight: 600;
  color: var(--color-text-muted);
}
.leaderboard-table .lb-score {
  text-align: right;
  font-family: var(--font-mono);
  font-size: 0.8125rem;
  width: 5rem;
}
.leaderboard-table .lb-type {
  width: 7rem;
}
.lb-badge {
  display: inline-block;
  font-size: 0.6875rem;
  font-weight: 600;
  padding: 0.125rem 0.5rem;
  border-radius: 10px;
  text-transform: uppercase;
  letter-spacing: 0.03em;
}
.lb-badge.baseline { background: #dbeafe; color: #1e40af; }
.lb-badge.prompting { background: #dcfce7; color: #166534; }
.lb-badge.finetuned { background: #fef3c7; color: #92400e; }
.lb-badge.rag { background: #f3e8ff; color: #6b21a8; }
.lb-badge.commercial { background: #fce7f3; color: #9d174d; }
.lb-badge.community { background: #e0e7ff; color: #3730a3; }

.lb-rank-1 { color: #d97706; font-weight: 700; }
.lb-rank-2 { color: #6b7280; font-weight: 700; }
.lb-rank-3 { color: #92400e; font-weight: 700; }

.lb-human-row {
  background: #fffbeb;
}

.leaderboard-footnote {
  margin-top: 0.75rem;
  font-size: 0.75rem;
  color: var(--color-text-muted);
  line-height: 1.6;
}

/* Python API section */
.python-api-section {
  padding-bottom: 2rem;
}
.python-api-section h2 {
  margin-bottom: 0.5rem;
}

.code-block {
  margin: 1rem 0;
  border: 1px solid var(--color-border);
  border-radius: var(--radius);
  overflow: hidden;
}
.code-block .code-header {
  padding: 0.5rem 0.75rem;
  background: var(--color-bg-alt);
  border-bottom: 1px solid var(--color-border);
  font-size: 0.75rem;
  font-weight: 600;
  color: var(--color-text-muted);
}
.code-block pre {
  margin: 0;
  border-radius: 0;
  background: #1e1e2e;
  color: #cdd6f4;
  padding: 1rem 1.25rem;
  font-size: 0.8125rem;
  line-height: 1.6;
}
.code-block pre code {
  background: none;
  padding: 0;
  color: inherit;
  font-size: inherit;
}

/* ===== Contact / Cite ===== */
.bibtex-block {
  background: #1e1e2e;
  color: #cdd6f4;
  padding: 1.25rem;
  border-radius: var(--radius);
  font-family: var(--font-mono);
  font-size: 0.8125rem;
  line-height: 1.6;
  overflow-x: auto;
  position: relative;
}

.bibtex-block pre {
  background: transparent;
  color: inherit;
  padding: 0;
  margin: 0;
}

.copy-btn {
  position: absolute;
  top: 0.5rem;
  right: 0.5rem;
  padding: 0.25rem 0.5rem;
  background: rgba(255,255,255,0.1);
  border: 1px solid rgba(255,255,255,0.15);
  border-radius: 4px;
  color: #cdd6f4;
  font-size: 0.75rem;
  cursor: pointer;
}
.copy-btn:hover { background: rgba(255,255,255,0.2); }

.contact-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
  gap: 1.5rem;
  margin: 1.5rem 0;
}

.contact-card {
  padding: 1.25rem;
  border: 1px solid var(--color-border);
  border-radius: var(--radius);
}
.contact-card h4 { margin: 0 0 0.5rem; font-size: 0.9375rem; }
.contact-card p { margin: 0; font-size: 0.875rem; color: var(--color-text-muted); }

/* ===== Footer ===== */
.site-footer {
  border-top: 1px solid var(--color-border);
  padding: 1.5rem 2rem;
  text-align: center;
  font-size: 0.8125rem;
  color: var(--color-text-muted);
}

/* ===== Code ===== */
code {
  font-family: var(--font-mono);
  font-size: 0.85em;
  background: var(--color-bg-alt);
  padding: 0.15em 0.35em;
  border-radius: 4px;
}

pre {
  background: var(--color-bg-alt);
  padding: 1rem;
  border-radius: var(--radius);
  overflow-x: auto;
  font-size: 0.8125rem;
}

/* ===== Responsive ===== */
@media (max-width: 768px) {
  .sidebar {
    transform: translateX(-100%);
    transition: transform 0.25s;
  }
  .sidebar.open { transform: translateX(0); }
  .sidebar-toggle { display: block; }

  .page-wrap { margin-left: 0; }

  .hero h1 { font-size: 1.75rem; }
  .dimensions-grid { grid-template-columns: 1fr; }
  .figure-row { flex-direction: column; }
  .config-grid { grid-template-columns: 1fr; }
  .chat-messages { height: 300px; }
  .score-grid { grid-template-columns: 1fr; }
  .form-row { flex-direction: column; }
  .leaderboard-controls { flex-direction: column; }
}