@import url('https://fonts.googleapis.com/css2?family=Inter:wght@400;500;600;700&display=swap');

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

:root {
  --bg: #0a0a0f;
  --bg2: #0d0d16;
  --bg3: #1a1a28;
  --fg: #e0e0e8;
  --fg2: #888894;
  --accent: #7c6cff;
  --green: #34d399;
  --red: #f87171;
  --orange: #fb923c;
  --yellow: #fbbf24;
  --blue: #60a5fa;
  --purple: #a78bfa;
  --cyan: #22d3ee;
}

body {
  background: var(--bg);
  color: var(--fg);
  font-family: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', system-ui, sans-serif;
  line-height: 1.75;
  font-size: 16px;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

html, body { overflow-x: hidden; }
a { color: var(--accent); text-decoration: none; }
a:hover { text-decoration: underline; }

@keyframes fadeInUp {
  from { transform: translateY(20px); opacity: 0; }
  to   { transform: translateY(0);    opacity: 1; }
}

/* Reading progress */
.reading-progress {
  position: fixed; top: 0; left: 0; height: 3px;
  background: linear-gradient(90deg, var(--cyan), var(--purple), var(--green));
  z-index: 200; width: 0%; transition: width 0.1s linear;
}

/* Hero */
.hero {
  background: linear-gradient(135deg, #0a0f1e 0%, #0f1a2e 40%, #162038 100%);
  padding: 96px 24px 48px; text-align: center;
  border-bottom: 1px solid rgba(255,255,255,0.06);
}
.hero-content { max-width: 960px; margin: 0 auto; }
.hero h1 {
  font-size: clamp(28px, 5vw, 48px); font-weight: 700;
  letter-spacing: -0.03em; margin-bottom: 12px;
  background: linear-gradient(135deg, #fff 0%, #22d3ee 100%);
  -webkit-background-clip: text; -webkit-text-fill-color: transparent; background-clip: text;
}
.hero .subtitle {
  font-size: 17px; color: var(--fg2); margin-bottom: 36px;
  max-width: 740px; margin-left: auto; margin-right: auto; line-height: 1.7;
}
.hero-stats {
  display: flex; justify-content: center; gap: 40px;
  flex-wrap: wrap; margin-bottom: 20px;
}
.hero-stat { display: flex; flex-direction: column; align-items: center; }
.hero-stat-value {
  font-size: 44px; font-weight: 700; letter-spacing: -0.03em; color: #fff;
}
.hero-stat-label { font-size: 12px; color: var(--fg2); margin-top: 2px; }
.hero-sources { font-size: 12px; color: var(--fg2); }
.hero-sources a { color: var(--fg2); text-decoration: underline; }

/* Author byline */
.author-byline {
  display: inline-flex; align-items: center; gap: 14px;
  margin-bottom: 32px; padding: 12px 20px;
  background: rgba(255,255,255,0.04); border: 1px solid rgba(255,255,255,0.08);
  border-radius: 60px;
}
.author-photo { width: 52px; height: 52px; border-radius: 50%; object-fit: cover; border: 2px solid rgba(255,255,255,0.2); }
.author-info { display: flex; flex-direction: column; text-align: left; }
.author-name { font-size: 15px; color: var(--fg); font-weight: 600; letter-spacing: 0.01em; }
.author-date { font-size: 12px; color: var(--fg2); margin-top: 1px; }

/* Sticky Nav */
.sticky-nav {
  position: sticky; top: 0; z-index: 100;
  background: rgba(10,10,15,0.92); backdrop-filter: blur(12px);
  border-bottom: 1px solid rgba(255,255,255,0.06);
}
.nav-inner {
  max-width: 1100px; margin: 0 auto; display: flex;
  gap: 4px; padding: 8px 16px; overflow-x: auto;
  -ms-overflow-style: none; scrollbar-width: none;
}
.nav-inner::-webkit-scrollbar { display: none; }
.nav-link {
  padding: 8px 16px; border-radius: 6px; font-size: 14px;
  font-weight: 500; color: var(--fg2); white-space: nowrap; transition: all 0.15s;
}
.nav-link:hover { color: #fff; background: rgba(255,255,255,0.08); text-decoration: none; }
.nav-link.active { color: #fff; background: var(--accent); text-decoration: none; }

/* Sections */
.section { padding: 80px 24px; }
.section.alt { background: var(--bg2); }
.container { max-width: 1100px; margin: 0 auto; }
.section h2 {
  font-size: 30px; font-weight: 700; letter-spacing: -0.02em;
  margin-bottom: 12px; position: relative; display: inline-block;
}
.section h2::after {
  content: ''; display: block; width: 48px; height: 3px;
  margin-top: 10px; border-radius: 2px;
  background: linear-gradient(135deg, var(--cyan), var(--blue));
}
.section-desc {
  font-size: 16px; color: var(--fg2); margin-bottom: 32px;
  max-width: 780px; line-height: 1.8; letter-spacing: 0.005em;
}
.section-prose {
  font-size: 16px; color: var(--fg); line-height: 1.85;
  max-width: 780px; margin-bottom: 28px; letter-spacing: 0.005em;
}
.section-prose strong { color: #fff; }
.cite {
  font-size: 12px; color: var(--purple); font-weight: 500;
  white-space: nowrap;
}

/* Chart cards */
.chart-row { display: flex; gap: 20px; margin-bottom: 32px; flex-wrap: wrap; }
.chart-card {
  flex: 1; min-width: 300px;
  background: rgba(255,255,255,0.035); border: 1px solid rgba(255,255,255,0.08);
  border-radius: 16px; padding: 24px;
  box-shadow: 0 2px 20px rgba(0,0,0,0.2);
  transition: transform 0.2s, box-shadow 0.2s, border-color 0.2s;
}
.chart-card:hover {
  transform: translateY(-2px); box-shadow: 0 4px 28px rgba(0,0,0,0.35);
  border-color: rgba(255,255,255,0.14);
}
.chart-card.wide { flex: 1 1 100%; margin-bottom: 32px; }
.chart-card h3 { font-size: 16px; font-weight: 600; margin-bottom: 4px; }
.chart-card .chart-desc { font-size: 13.5px; color: var(--fg2); margin-bottom: 14px; line-height: 1.7; }

/* Callout banners */
.callout-banner {
  padding: 20px 24px; border-left: 4px solid var(--cyan);
  background: rgba(34,211,238,0.06); border-radius: 0 10px 10px 0;
  margin-bottom: 24px;
}
.callout-banner .cb-title { font-size: 15px; font-weight: 600; color: #fff; margin-bottom: 6px; }
.callout-banner .cb-body { font-size: 14px; color: var(--fg2); line-height: 1.7; margin: 0; }

/* ── Interactive MCP Diagram ─────────────────────────── */
.diagram-wrapper {
  position: relative; width: 100%; height: 500px;
  background: linear-gradient(180deg, rgba(0,0,0,0.35) 0%, rgba(0,0,0,0.2) 100%);
  border-radius: 16px;
  border: 1px solid rgba(255,255,255,0.08); overflow: hidden;
}
.diagram-wrapper canvas { display: block; }
.diagram-controls {
  display: flex; justify-content: center; gap: 8px;
  margin-top: 16px;
}
.diagram-btn {
  padding: 10px 24px; border-radius: 8px; font-size: 14px;
  font-weight: 600; cursor: pointer; transition: all 0.2s;
  border: 1px solid rgba(255,255,255,0.12); background: rgba(255,255,255,0.04);
  color: var(--fg2); font-family: inherit;
}
.diagram-btn:hover { background: rgba(255,255,255,0.08); color: #fff; border-color: rgba(255,255,255,0.2); }
.diagram-btn.active {
  background: rgba(34,211,238,0.15); color: var(--cyan);
  border-color: var(--cyan); box-shadow: 0 0 20px rgba(34,211,238,0.15);
}
.diagram-btn.active-red {
  background: rgba(248,113,113,0.15); color: var(--red);
  border-color: var(--red); box-shadow: 0 0 20px rgba(248,113,113,0.15);
}
.diagram-legend {
  display: flex; align-items: center; justify-content: center;
  gap: 20px; margin-top: 12px; font-size: 12px; color: var(--fg2);
}
.diagram-legend span { display: flex; align-items: center; gap: 6px; }
.diagram-footnote {
  text-align: center; margin-top: 14px;
  font-size: 13px; color: var(--fg2); line-height: 1.6;
  font-style: italic;
}
.legend-dot {
  width: 10px; height: 10px; border-radius: 50%; display: inline-block;
}

/* Analogy cards */
.analogy-grid { display: grid; grid-template-columns: 1fr 1fr; gap: 16px; }
.analogy-card {
  background: rgba(255,255,255,0.035); border: 1px solid rgba(255,255,255,0.08);
  border-radius: 12px; padding: 24px; transition: transform 0.2s, border-color 0.2s;
}
.analogy-card:hover { transform: translateY(-2px); border-color: rgba(255,255,255,0.14); }
.analogy-card .ac-icon { font-size: 32px; margin-bottom: 12px; }
.analogy-card h4 { font-size: 15px; font-weight: 600; margin-bottom: 8px; }
.analogy-card .ac-before { font-size: 13px; color: var(--red); margin-bottom: 4px; }
.analogy-card .ac-after { font-size: 13px; color: var(--green); margin-bottom: 8px; }
.analogy-card p { font-size: 13px; color: var(--fg2); line-height: 1.6; }
.analogy-card .ac-source { font-size: 11px; color: var(--purple); margin-top: 8px; }

/* Stat bars */
.stat-bar-group { margin-bottom: 20px; }
.stat-bar-label { font-size: 13px; color: var(--fg); margin-bottom: 6px; display: flex; justify-content: space-between; }
.stat-bar-track { height: 28px; background: rgba(255,255,255,0.06); border-radius: 6px; overflow: hidden; position: relative; }
.stat-bar-fill { height: 100%; border-radius: 6px; transition: width 1s ease; display: flex; align-items: center; padding-left: 10px; font-size: 12px; font-weight: 600; color: #fff; }

/* Workflow comparison */
.workflow-compare {
  display: grid; grid-template-columns: 1fr 1fr; gap: 20px;
}
.workflow-col {
  background: rgba(255,255,255,0.03); border: 1px solid rgba(255,255,255,0.08);
  border-radius: 12px; padding: 20px;
}
.workflow-col h4 {
  font-size: 14px; font-weight: 600; margin-bottom: 14px;
  display: flex; align-items: center; gap: 8px;
}
.workflow-step {
  display: flex; align-items: center; gap: 10px; padding: 8px 10px;
  border-radius: 6px; margin-bottom: 6px; font-size: 13px;
  background: rgba(255,255,255,0.03); border: 1px solid rgba(255,255,255,0.05);
}
.workflow-step .step-num {
  width: 24px; height: 24px; border-radius: 50%; display: flex;
  align-items: center; justify-content: center; font-size: 11px;
  font-weight: 700; flex-shrink: 0;
}
.workflow-step .step-text { font-size: 12px; color: var(--fg2); }
.workflow-step .step-time { margin-left: auto; font-size: 11px; font-weight: 600; white-space: nowrap; }
.workflow-total {
  margin-top: 12px; padding: 10px 12px; border-radius: 8px;
  font-size: 14px; font-weight: 600; text-align: center;
}

/* Horizontal Timeline */
.h-timeline {
  position: relative;
  padding: 32px 0 8px;
  overflow-x: auto;
  -ms-overflow-style: none; scrollbar-width: none;
}
.h-timeline::-webkit-scrollbar { display: none; }
.h-timeline-track {
  position: absolute;
  top: 39px;
  left: 0;
  right: 0;
  height: 3px;
  background: linear-gradient(90deg, var(--cyan), var(--purple), var(--blue));
  border-radius: 2px;
}
.h-timeline-items {
  display: flex;
  gap: 0;
  position: relative;
  min-width: max-content;
}
.h-tl-item {
  flex: 0 0 150px;
  display: flex;
  flex-direction: column;
  align-items: center;
  position: relative;
}
.h-tl-dot {
  width: 16px; height: 16px;
  border-radius: 50%;
  background: var(--cyan);
  border: 3px solid var(--bg);
  z-index: 2;
  flex-shrink: 0;
  box-shadow: 0 0 10px rgba(34,211,238,0.3);
  transition: transform 0.2s, box-shadow 0.2s;
}
.h-tl-item:hover .h-tl-dot {
  transform: scale(1.3);
  box-shadow: 0 0 18px rgba(34,211,238,0.5);
}
.h-tl-card {
  margin-top: 14px;
  background: rgba(255,255,255,0.04);
  border: 1px solid rgba(255,255,255,0.08);
  border-radius: 10px;
  padding: 12px 10px;
  text-align: center;
  width: 140px;
  transition: transform 0.2s, border-color 0.2s;
}
.h-tl-item:hover .h-tl-card {
  transform: translateY(-3px);
  border-color: rgba(255,255,255,0.18);
}
.h-tl-date {
  font-size: 11px; font-weight: 700;
  color: var(--cyan); letter-spacing: 0.03em;
  margin-bottom: 4px;
}
.h-tl-title {
  font-size: 13px; font-weight: 600;
  color: var(--fg); margin-bottom: 4px;
  line-height: 1.3;
}
.h-tl-body {
  font-size: 11px; color: var(--fg2);
  line-height: 1.5;
}
@media (max-width: 700px) {
  .h-tl-item { flex: 0 0 130px; }
  .h-tl-card { width: 120px; padding: 10px 8px; }
}

/* Key findings / stat cards */
.findings-grid {
  display: grid; grid-template-columns: repeat(auto-fit, minmax(220px, 1fr));
  gap: 14px;
}
.finding-card {
  background: rgba(255,255,255,0.035); border: 1px solid rgba(255,255,255,0.08);
  border-radius: 10px; padding: 18px;
  box-shadow: 0 2px 20px rgba(0,0,0,0.2);
  transition: transform 0.2s, box-shadow 0.2s, border-color 0.2s;
}
.finding-card:hover {
  transform: translateY(-2px); box-shadow: 0 4px 28px rgba(0,0,0,0.35);
  border-color: rgba(255,255,255,0.14);
}
.finding-card .fc-stat { font-size: 28px; font-weight: 700; margin-bottom: 4px; }
.finding-card .fc-title { font-size: 13px; font-weight: 600; margin-bottom: 4px; }
.finding-card .fc-body { font-size: 11px; color: var(--fg2); line-height: 1.5; }

/* Adopter logos grid */
.adopter-grid {
  display: grid; grid-template-columns: repeat(auto-fit, minmax(140px, 1fr));
  gap: 10px;
}
.adopter-card {
  background: rgba(255,255,255,0.04); border: 1px solid rgba(255,255,255,0.08);
  border-radius: 10px; padding: 14px; text-align: center;
  transition: transform 0.2s, border-color 0.2s;
}
.adopter-card:hover { transform: translateY(-2px); border-color: rgba(255,255,255,0.18); }
.adopter-card .ad-name { font-size: 14px; font-weight: 600; color: var(--fg); margin-bottom: 2px; }
.adopter-card .ad-date { font-size: 11px; color: var(--cyan); }
.adopter-card .ad-role { font-size: 11px; color: var(--fg2); margin-top: 2px; }

/* Methodology */
.method-grid { display: grid; grid-template-columns: repeat(auto-fit, minmax(320px, 1fr)); gap: 16px; }
.method-card {
  background: rgba(255,255,255,0.035); border: 1px solid rgba(255,255,255,0.08);
  border-radius: 10px; padding: 20px; box-shadow: 0 2px 20px rgba(0,0,0,0.2);
  transition: transform 0.2s, box-shadow 0.2s, border-color 0.2s;
}
.method-card:hover { transform: translateY(-2px); box-shadow: 0 4px 28px rgba(0,0,0,0.35); border-color: rgba(255,255,255,0.14); }
.method-card h3 { font-size: 15px; font-weight: 600; margin-bottom: 8px; }
.method-card p { font-size: 13px; color: var(--fg2); line-height: 1.6; }
.method-card a { color: var(--accent); }
.method-tag { margin-top: 10px; font-size: 11px; color: var(--purple); font-weight: 500; }

.method-toggle { margin-top: 0; }
.method-toggle-btn {
  cursor: pointer; font-size: 15px; font-weight: 600; color: var(--accent);
  padding: 14px 20px; background: rgba(124,108,255,0.06);
  border: 1px solid rgba(124,108,255,0.2); border-radius: 10px;
  list-style: none; display: flex; align-items: center; gap: 8px;
  transition: background 0.15s, border-color 0.15s;
}
.method-toggle-btn:hover { background: rgba(124,108,255,0.12); border-color: rgba(124,108,255,0.35); }
.method-toggle-btn::before { content: '\25B6'; font-size: 11px; transition: transform 0.2s; display: inline-block; }
.method-toggle[open] .method-toggle-btn::before { transform: rotate(90deg); }
.method-toggle-btn::-webkit-details-marker { display: none; }
.method-toggle .method-grid { margin-top: 20px; }
.method-toggle[open] .method-grid { animation: fadeInUp 0.3s ease both; }

/* Conclusion */
.conclusion-box {
  margin-top: 40px; padding: 28px;
  background: rgba(255,255,255,0.03); border: 2px solid transparent;
  border-image: linear-gradient(135deg, var(--cyan), var(--blue)) 1;
  border-radius: 12px; box-shadow: 0 4px 28px rgba(0,0,0,0.3);
}
.conclusion-box h3 { font-size: 20px; font-weight: 700; margin-bottom: 12px; }
.conclusion-box .cb-lead { font-size: 14px; color: var(--fg); line-height: 1.7; margin-bottom: 16px; }
.conclusion-box .cb-detail { font-size: 13px; color: var(--fg2); line-height: 1.7; margin-bottom: 12px; }
.conclusion-box .cb-detail strong { color: var(--fg); }
.conclusion-box .cb-closing { font-size: 14px; color: var(--fg); line-height: 1.7; font-weight: 500; }
.conclusion-box .cb-actions {
  list-style: none; padding: 0; margin: 0 0 16px 0;
  display: flex; flex-direction: column; gap: 10px;
}
.conclusion-box .cb-actions li {
  font-size: 13px; color: var(--fg2); line-height: 1.7; padding: 12px 16px;
  background: rgba(255,255,255,0.03); border: 1px solid rgba(255,255,255,0.06); border-radius: 8px;
}
.conclusion-box .cb-actions li strong { color: var(--fg); }

/* Conclusion columns */
.conclusion-columns {
  display: grid; grid-template-columns: 1fr 1fr; gap: 24px;
  margin-bottom: 20px;
}
@media (max-width: 700px) {
  .conclusion-columns { grid-template-columns: 1fr; }
}

/* Method publication name */
.method-pub { font-size: 13px; color: var(--cyan); font-weight: 500; margin-bottom: 6px; }

/* Footer */
footer {
  padding: 28px 24px; text-align: center; font-size: 12px;
  color: var(--fg2); border-top: 1px solid rgba(255,255,255,0.06);
}
.footer-note { margin-top: 6px; font-size: 11px; opacity: 0.5; }
.view-counter { margin-top: 12px; }
.view-counter img { height: 20px; border-radius: 4px; opacity: 0.7; transition: opacity 0.2s; }
.view-counter img:hover { opacity: 1; }

/* Scrollbar */
::-webkit-scrollbar { width: 5px; }
::-webkit-scrollbar-track { background: transparent; }
::-webkit-scrollbar-thumb { background: rgba(255,255,255,0.1); border-radius: 3px; }

/* ── Responsive: tablets ─────────────────────────────── */
@media (max-width: 900px) {
  .hero { padding: 72px 20px 40px; }
  .hero-stat-value { font-size: 38px; }
  .section { padding: 64px 20px; }
  .section h2 { font-size: 26px; }
  .analogy-grid { grid-template-columns: 1fr; }
  .workflow-compare { grid-template-columns: 1fr; }
  .findings-grid { grid-template-columns: repeat(auto-fit, minmax(200px, 1fr)); }
}

/* ── Responsive: phones ──────────────────────────────── */
@media (max-width: 700px) {
  .hero { padding: 56px 16px 32px; }
  .hero .subtitle { font-size: 15px; margin-bottom: 24px; }
  .hero-stats { gap: 16px; }
  .hero-stat-value { font-size: 30px; }
  .hero-stat-label { font-size: 11px; }
  .section { padding: 48px 14px; }
  .section h2 { font-size: 23px; margin-bottom: 6px; }
  .section-desc { font-size: 14px; margin-bottom: 24px; }
  .chart-row { flex-direction: column; gap: 14px; }
  .chart-card { min-width: unset; padding: 18px; }
  .chart-card h3 { font-size: 15px; }
  .chart-card .chart-desc { font-size: 12px; margin-bottom: 10px; }
  .analogy-grid { grid-template-columns: 1fr; }
  .workflow-compare { grid-template-columns: 1fr; }
  .diagram-wrapper { height: 360px; }
  .diagram-controls { flex-wrap: wrap; }
  .diagram-btn { padding: 8px 16px; font-size: 13px; }
  .method-grid { grid-template-columns: 1fr; }
  .callout-banner { padding: 16px 18px !important; }
  .conclusion-box { padding: 18px; margin-top: 28px; }
  .findings-grid { grid-template-columns: 1fr; gap: 10px; }
  .finding-card { padding: 14px; }
  .finding-card .fc-stat { font-size: 24px; }
  .adopter-grid { grid-template-columns: repeat(auto-fit, minmax(120px, 1fr)); gap: 8px; }
  footer { padding: 20px 14px; }
}

/* ── Responsive: small phones ────────────────────────── */
@media (max-width: 400px) {
  .hero { padding: 40px 12px 24px; }
  .hero h1 { font-size: 24px; }
  .hero .subtitle { font-size: 14px; }
  .hero-stat-value { font-size: 24px; }
  .hero-stats { gap: 10px; }
  .section { padding: 36px 10px; }
  .section h2 { font-size: 20px; }
  .chart-card { padding: 14px; border-radius: 12px; }
  .diagram-wrapper { height: 280px; }
  .nav-link { padding: 5px 10px; font-size: 12px; }
  .conclusion-box { padding: 14px; margin-top: 20px; }
}