/* ============================================
   VCS Product Portal — Global Styles
   chatwang.com
   ============================================ */

:root {
  --bg-primary: #0a0a0f;
  --bg-secondary: #111118;
  --bg-card: #14141c;
  --bg-card-hover: #1a1a24;
  --border: #1e1e2e;
  --border-light: #2a2a3e;
  --text-primary: #e2e8f0;
  --text-secondary: #94a3b8;
  --text-muted: #64748b;
  --accent: #00d4ff;
  --accent-soft: rgba(0, 212, 255, 0.1);
  --accent-glow: rgba(0, 212, 255, 0.3);
  --secondary: #6366f1;
  --secondary-soft: rgba(99, 102, 241, 0.1);
  --status-active: #10b981;
  --status-active-soft: rgba(16, 185, 129, 0.1);
  --status-beta: #f59e0b;
  --status-beta-soft: rgba(245, 158, 11, 0.1);
  --status-init: #6b7280;
  --status-init-soft: rgba(107, 114, 128, 0.1);
  --radius-sm: 8px;
  --radius-md: 12px;
  --radius-lg: 16px;
  --radius-xl: 24px;
  --transition: 0.25s cubic-bezier(0.4, 0, 0.2, 1);
  --font-sans: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Noto Sans SC", "PingFang SC", "Microsoft YaHei", sans-serif;
  --font-mono: "SF Mono", "Fira Code", "JetBrains Mono", monospace;
}

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

html {
  scroll-behavior: smooth;
  -webkit-font-smoothing: antialiased;
}

body {
  font-family: var(--font-sans);
  background: var(--bg-primary);
  color: var(--text-primary);
  line-height: 1.6;
  min-height: 100vh;
  overflow-x: hidden;
}

a {
  color: var(--accent);
  text-decoration: none;
  transition: opacity var(--transition);
}

a:hover {
  opacity: 0.8;
}

/* ---- Navigation ---- */
.topbar {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  z-index: 1000;
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 0 32px;
  height: 64px;
  background: rgba(10, 10, 15, 0.8);
  backdrop-filter: blur(20px);
  border-bottom: 1px solid var(--border);
}

.brand {
  display: flex;
  align-items: center;
  gap: 10px;
  font-weight: 700;
  font-size: 1.1rem;
  color: var(--text-primary);
  letter-spacing: -0.02em;
}

.brand-mark {
  width: 28px;
  height: 28px;
  border-radius: 6px;
  background: linear-gradient(135deg, var(--accent), var(--secondary));
  display: flex;
  align-items: center;
  justify-content: center;
}

.brand-mark::after {
  content: "◈";
  font-size: 14px;
  color: white;
}

.nav {
  display: flex;
  gap: 28px;
}

.nav a {
  font-size: 0.9rem;
  color: var(--text-secondary);
  font-weight: 500;
  position: relative;
  padding: 4px 0;
}

.nav a::after {
  content: "";
  position: absolute;
  bottom: 0;
  left: 0;
  width: 0;
  height: 2px;
  background: var(--accent);
  transition: width var(--transition);
  border-radius: 1px;
}

.nav a:hover,
.nav a.is-active {
  color: var(--text-primary);
}

.nav a:hover::after,
.nav a.is-active::after {
  width: 100%;
}

/* ---- Main ---- */
main {
  padding-top: 64px;
}

/* ---- Hero ---- */
.hero {
  position: relative;
  display: flex;
  align-items: center;
  justify-content: space-between;
  max-width: 1200px;
  margin: 0 auto;
  padding: 100px 32px 80px;
  gap: 60px;
}

.hero-content {
  flex: 1;
  max-width: 580px;
}

.eyebrow {
  font-size: 0.8rem;
  font-weight: 600;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: var(--accent);
  margin-bottom: 16px;
  display: flex;
  align-items: center;
  gap: 8px;
}

.eyebrow::before {
  content: "";
  display: inline-block;
  width: 24px;
  height: 2px;
  background: var(--accent);
  border-radius: 1px;
}

.hero h1 {
  font-size: 3.2rem;
  font-weight: 800;
  line-height: 1.15;
  letter-spacing: -0.03em;
  margin-bottom: 24px;
  background: linear-gradient(135deg, var(--text-primary) 0%, var(--accent) 100%);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

.hero-copy {
  font-size: 1.15rem;
  color: var(--text-secondary);
  line-height: 1.7;
  margin-bottom: 36px;
}

.hero-actions {
  display: flex;
  gap: 16px;
  flex-wrap: wrap;
}

.button {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 12px 28px;
  border-radius: var(--radius-md);
  font-size: 0.95rem;
  font-weight: 600;
  transition: all var(--transition);
  cursor: pointer;
  border: none;
  font-family: inherit;
}

.button.primary {
  background: linear-gradient(135deg, var(--accent), #0099cc);
  color: #000;
  box-shadow: 0 0 20px var(--accent-glow);
}

.button.primary:hover {
  transform: translateY(-2px);
  box-shadow: 0 4px 24px var(--accent-glow);
  opacity: 1;
}

.button.secondary {
  background: transparent;
  color: var(--text-primary);
  border: 1.5px solid var(--border-light);
}

.button.secondary:hover {
  border-color: var(--accent);
  background: var(--accent-soft);
  opacity: 1;
}

.hero-visual {
  flex: 0 0 420px;
  display: flex;
  align-items: center;
  justify-content: center;
}

.hero-visual img {
  width: 100%;
  border-radius: var(--radius-lg);
  box-shadow: 0 20px 60px rgba(0, 0, 0, 0.5);
}

/* ---- Status Band ---- */
.status-band {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  max-width: 1200px;
  margin: 0 auto 60px;
  padding: 0 32px;
  gap: 1px;
  background: var(--border);
  border-radius: var(--radius-md);
  overflow: hidden;
}

.status-item {
  background: var(--bg-secondary);
  padding: 28px 20px;
  text-align: center;
}

.status-item .metric {
  display: block;
  font-size: 2.2rem;
  font-weight: 800;
  color: var(--accent);
  line-height: 1;
  margin-bottom: 8px;
  font-family: var(--font-mono);
}

.status-item .label {
  font-size: 0.85rem;
  color: var(--text-muted);
  font-weight: 500;
}

/* ---- Section ---- */
.section {
  max-width: 1200px;
  margin: 0 auto;
  padding: 60px 32px;
}

.section-heading {
  text-align: center;
  margin-bottom: 48px;
}

.section-heading h2 {
  font-size: 2rem;
  font-weight: 700;
  letter-spacing: -0.02em;
  margin-top: 12px;
}

.section-heading.compact {
  text-align: left;
  margin-bottom: 32px;
}

/* ---- Filter Bar ---- */
.filter-bar {
  display: flex;
  gap: 12px;
  margin-bottom: 36px;
  flex-wrap: wrap;
}

.filter-btn {
  padding: 8px 18px;
  border-radius: 100px;
  font-size: 0.85rem;
  font-weight: 500;
  background: var(--bg-secondary);
  color: var(--text-secondary);
  border: 1px solid var(--border);
  cursor: pointer;
  transition: all var(--transition);
  font-family: inherit;
}

.filter-btn:hover {
  border-color: var(--border-light);
  color: var(--text-primary);
}

.filter-btn.is-active {
  background: var(--accent-soft);
  border-color: var(--accent);
  color: var(--accent);
}

/* ---- Project Grid ---- */
.project-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 24px;
}

/* ---- Project Card ---- */
.project-card {
  display: block;
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--radius-lg);
  overflow: hidden;
  transition: all var(--transition);
  cursor: pointer;
}

.project-card:hover {
  border-color: var(--border-light);
  background: var(--bg-card-hover);
  transform: translateY(-4px);
  box-shadow: 0 12px 40px rgba(0, 0, 0, 0.4);
}

.card-visual {
  width: 100%;
  height: 180px;
  background: linear-gradient(135deg, var(--bg-secondary), var(--bg-primary));
  display: flex;
  align-items: center;
  justify-content: center;
  position: relative;
  overflow: hidden;
}

.card-visual::before {
  content: "";
  position: absolute;
  inset: 0;
  background: radial-gradient(circle at 70% 30%, var(--accent-soft), transparent 60%);
  opacity: 0.5;
}

.card-icon {
  font-size: 3.5rem;
  z-index: 1;
  filter: drop-shadow(0 4px 12px rgba(0, 0, 0, 0.3));
}

.card-body {
  padding: 24px;
}

.card-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  margin-bottom: 12px;
}

.card-route {
  font-family: var(--font-mono);
  font-size: 0.75rem;
  color: var(--accent);
  background: var(--accent-soft);
  padding: 4px 10px;
  border-radius: 6px;
  font-weight: 500;
}

.status-badge {
  font-size: 0.7rem;
  font-weight: 600;
  padding: 3px 10px;
  border-radius: 100px;
  text-transform: uppercase;
  letter-spacing: 0.03em;
}

.status-badge.active {
  background: var(--status-active-soft);
  color: var(--status-active);
}

.status-badge.beta {
  background: var(--status-beta-soft);
  color: var(--status-beta);
}

.status-badge.init {
  background: var(--status-init-soft);
  color: var(--status-init);
}

.card-name {
  font-size: 1.25rem;
  font-weight: 700;
  margin-bottom: 8px;
  color: var(--text-primary);
}

.card-desc {
  font-size: 0.9rem;
  color: var(--text-secondary);
  line-height: 1.5;
  display: -webkit-box;
  -webkit-line-clamp: 2;
  -webkit-box-orient: vertical;
  overflow: hidden;
}

.card-meta {
  display: flex;
  gap: 16px;
  margin-top: 16px;
  padding-top: 16px;
  border-top: 1px solid var(--border);
}

.card-meta-item {
  font-size: 0.8rem;
  color: var(--text-muted);
  display: flex;
  align-items: center;
  gap: 6px;
}

/* ---- App Detail Page ---- */
.app-hero {
  max-width: 1200px;
  margin: 0 auto;
  padding: 80px 32px 40px;
  display: flex;
  gap: 48px;
  align-items: flex-start;
}

.app-hero-visual {
  flex: 0 0 200px;
  width: 200px;
  height: 200px;
  border-radius: var(--radius-xl);
  background: linear-gradient(135deg, var(--bg-secondary), var(--bg-primary));
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 5rem;
  border: 1px solid var(--border);
  position: relative;
  overflow: hidden;
}

.app-hero-visual::before {
  content: "";
  position: absolute;
  inset: 0;
  background: radial-gradient(circle at 60% 40%, var(--accent-soft), transparent 70%);
}

.app-hero-info {
  flex: 1;
}

.app-hero-info h1 {
  font-size: 2.5rem;
  font-weight: 800;
  margin-bottom: 12px;
  letter-spacing: -0.02em;
}

.app-id {
  font-family: var(--font-mono);
  font-size: 0.85rem;
  color: var(--accent);
  background: var(--accent-soft);
  padding: 4px 12px;
  border-radius: 6px;
  display: inline-block;
  margin-bottom: 16px;
}

.app-desc {
  font-size: 1.1rem;
  color: var(--text-secondary);
  line-height: 1.7;
  max-width: 600px;
  margin-bottom: 24px;
}

.app-actions {
  display: flex;
  gap: 12px;
  flex-wrap: wrap;
}

/* ---- Detail Sections ---- */
.detail-section {
  max-width: 1200px;
  margin: 0 auto;
  padding: 40px 32px;
  border-top: 1px solid var(--border);
}

.detail-section h3 {
  font-size: 1.1rem;
  font-weight: 600;
  color: var(--text-primary);
  margin-bottom: 20px;
  display: flex;
  align-items: center;
  gap: 10px;
}

.detail-section h3 .icon {
  color: var(--accent);
}

/* ---- Info Grid ---- */
.info-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 16px;
}

.info-item {
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--radius-md);
  padding: 20px;
}

.info-item .label {
  font-size: 0.8rem;
  color: var(--text-muted);
  text-transform: uppercase;
  letter-spacing: 0.05em;
  margin-bottom: 6px;
  font-weight: 500;
}

.info-item .value {
  font-size: 0.95rem;
  color: var(--text-primary);
  font-weight: 500;
  line-height: 1.5;
}

.info-item .value.mono {
  font-family: var(--font-mono);
  font-size: 0.85rem;
  word-break: break-all;
}

/* ---- Routing List ---- */
.route-list {
  display: flex;
  flex-direction: column;
  gap: 12px;
}

.route-item {
  display: flex;
  align-items: flex-start;
  gap: 16px;
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--radius-md);
  padding: 16px 20px;
}

.route-item .arrow {
  color: var(--accent);
  font-size: 1.2rem;
  flex-shrink: 0;
  margin-top: 2px;
}

.route-item .content {
  flex: 1;
}

.route-item .content .trigger {
  font-weight: 600;
  color: var(--text-primary);
  margin-bottom: 4px;
}

.route-item .content .target {
  font-size: 0.85rem;
  color: var(--text-secondary);
  font-family: var(--font-mono);
}

/* ---- Learning List ---- */
.learning-list {
  display: flex;
  flex-direction: column;
  gap: 10px;
}

.learning-item {
  display: flex;
  align-items: flex-start;
  gap: 12px;
  font-size: 0.95rem;
  color: var(--text-secondary);
  padding: 10px 14px;
  background: var(--bg-card);
  border-radius: var(--radius-sm);
  border: 1px solid var(--border);
}

.learning-item .dot {
  width: 6px;
  height: 6px;
  border-radius: 50%;
  background: var(--accent);
  flex-shrink: 0;
  margin-top: 8px;
}

/* ---- Flow Section (about page) ---- */
.flow-pipeline {
  display: flex;
  align-items: stretch;
  gap: 16px;
  flex-wrap: wrap;
  justify-content: center;
}

.flow-step {
  flex: 1;
  min-width: 180px;
  max-width: 220px;
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--radius-lg);
  padding: 28px 24px;
  text-align: center;
  position: relative;
}

.flow-step .step-badge {
  width: 40px;
  height: 40px;
  border-radius: 50%;
  background: var(--accent-soft);
  color: var(--accent);
  display: flex;
  align-items: center;
  justify-content: center;
  font-weight: 700;
  font-size: 0.9rem;
  margin: 0 auto 16px;
  font-family: var(--font-mono);
}

.flow-step h3 {
  font-size: 1.1rem;
  font-weight: 600;
  margin-bottom: 8px;
}

.flow-step p {
  font-size: 0.85rem;
  color: var(--text-secondary);
  line-height: 1.6;
}

.flow-arrow {
  display: flex;
  align-items: center;
  justify-content: center;
  color: var(--accent);
  font-size: 1.5rem;
  align-self: center;
}

/* ---- Rules Grid ---- */
.rules-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 20px;
}

.rule-card {
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--radius-lg);
  padding: 28px;
  transition: all var(--transition);
}

.rule-card:hover {
  border-color: var(--border-light);
  background: var(--bg-card-hover);
}

.rule-icon {
  font-size: 1.8rem;
  margin-bottom: 12px;
}

.rule-card h3 {
  font-size: 1.1rem;
  font-weight: 600;
  margin-bottom: 8px;
}

.rule-card p {
  font-size: 0.9rem;
  color: var(--text-secondary);
  line-height: 1.6;
}

/* ---- Footer ---- */
.footer {
  max-width: 1200px;
  margin: 0 auto;
  padding: 40px 32px;
  border-top: 1px solid var(--border);
  display: flex;
  justify-content: space-between;
  align-items: center;
  flex-wrap: wrap;
  gap: 16px;
}

.footer-brand {
  font-weight: 700;
  color: var(--text-primary);
}

.footer-tagline {
  font-size: 0.85rem;
  color: var(--text-muted);
}

.footer-links {
  display: flex;
  gap: 24px;
}

.footer-links a {
  font-size: 0.85rem;
  color: var(--text-muted);
}

.footer-links a:hover {
  color: var(--accent);
  opacity: 1;
}

/* ---- Reveal Animation ---- */
.reveal {
  opacity: 0;
  transform: translateY(24px);
  transition: opacity 0.6s ease, transform 0.6s ease;
}

.reveal.is-visible {
  opacity: 1;
  transform: translateY(0);
}

.reveal-delay-1 { transition-delay: 0.1s; }
.reveal-delay-2 { transition-delay: 0.2s; }
.reveal-delay-3 { transition-delay: 0.3s; }
.reveal-delay-4 { transition-delay: 0.4s; }
.reveal-delay-5 { transition-delay: 0.5s; }

/* ---- Breadcrumbs ---- */
.breadcrumbs {
  max-width: 1200px;
  margin: 0 auto;
  padding: 20px 32px 0;
  font-size: 0.85rem;
  color: var(--text-muted);
}

.breadcrumbs a {
  color: var(--text-muted);
}

.breadcrumbs a:hover {
  color: var(--accent);
  opacity: 1;
}

.breadcrumbs .sep {
  margin: 0 8px;
  color: var(--text-muted);
}

/* ---- Responsive ---- */
@media (max-width: 1024px) {
  .project-grid {
    grid-template-columns: repeat(2, 1fr);
  }
  .hero {
    flex-direction: column;
    text-align: center;
    padding-top: 80px;
  }
  .hero-content {
    max-width: 100%;
  }
  .hero-visual {
    flex: none;
    width: 100%;
    max-width: 400px;
  }
  .hero h1 {
    font-size: 2.4rem;
  }
  .hero-actions {
    justify-content: center;
  }
  .app-hero {
    flex-direction: column;
    align-items: center;
    text-align: center;
  }
  .app-hero-info {
    text-align: center;
  }
  .app-desc {
    margin-left: auto;
    margin-right: auto;
  }
}

@media (max-width: 768px) {
  .topbar {
    padding: 0 20px;
  }
  .nav {
    display: none;
  }
  .hero {
    padding: 60px 20px 40px;
  }
  .hero h1 {
    font-size: 1.8rem;
  }
  .hero-copy {
    font-size: 1rem;
  }
  .status-band {
    grid-template-columns: repeat(2, 1fr);
    padding: 0 20px;
  }
  .section {
    padding: 40px 20px;
  }
  .project-grid {
    grid-template-columns: 1fr;
  }
  .rules-grid {
    grid-template-columns: 1fr;
  }
  .info-grid {
    grid-template-columns: 1fr;
  }
  .flow-pipeline {
    flex-direction: column;
    align-items: center;
  }
  .flow-arrow {
    transform: rotate(90deg);
  }
  .app-hero {
    padding: 60px 20px 30px;
  }
  .app-hero-visual {
    flex: none;
    width: 160px;
    height: 160px;
  }
  .detail-section {
    padding: 30px 20px;
  }
  .footer {
    flex-direction: column;
    text-align: center;
    padding: 30px 20px;
  }
}

/* ---- Mobile Menu Toggle ---- */
.menu-toggle {
  display: none;
  background: none;
  border: none;
  color: var(--text-primary);
  font-size: 1.5rem;
  cursor: pointer;
}

@media (max-width: 768px) {
  .menu-toggle {
    display: block;
  }
  .nav {
    position: fixed;
    top: 64px;
    right: -100%;
    width: 240px;
    height: calc(100vh - 64px);
    background: var(--bg-secondary);
    border-left: 1px solid var(--border);
    flex-direction: column;
    padding: 24px;
    transition: right var(--transition);
    display: flex;
  }
  .nav.is-open {
    right: 0;
  }
  .nav a::after {
    display: none;
  }
}

/* ---- Scrollbar ---- */
::-webkit-scrollbar {
  width: 8px;
}
::-webkit-scrollbar-track {
  background: var(--bg-primary);
}
::-webkit-scrollbar-thumb {
  background: var(--border-light);
  border-radius: 4px;
}
::-webkit-scrollbar-thumb:hover {
  background: var(--text-muted);
}

/* ---- Selection ---- */
::selection {
  background: var(--accent-soft);
  color: var(--accent);
}