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

:root {
  /* Dark theme (default) */
  --bg-primary: #0A0A0B;
  --bg-secondary: #111113;
  --bg-tertiary: #18181B;
  --bg-card: #16161A;
  --bg-code: #1E1E22;
  --text-primary: #EDEDEF;
  --text-secondary: #A1A1AA;
  --text-tertiary: #71717A;
  --accent: #2DD4BF;
  --accent-dim: rgba(45, 212, 191, 0.12);
  --accent-hover: #5EEAD4;
  --border: #27272A;
  --border-hover: #3F3F46;
  --shadow-card: 0 1px 3px rgba(0, 0, 0, 0.4);
  --shadow-card-hover: 0 4px 12px rgba(0, 0, 0, 0.5);
  --code-keyword: #C792EA;
  --code-string: #C3E88D;
  --code-key: #89DDFF;
  --code-value: #F78C6C;
  --tab-bg: #0A0A0B;
  --tab-active-bg: #1E1E22;
  --diagram-line: #3F3F46;
  --diagram-box-bg: #16161A;
}

[data-theme="light"] {
  --bg-primary: #FAFAFA;
  --bg-secondary: #F4F4F5;
  --bg-tertiary: #E4E4E7;
  --bg-card: #FFFFFF;
  --bg-code: #F4F4F5;
  --text-primary: #18181B;
  --text-secondary: #52525B;
  --text-tertiary: #71717A;
  --accent: #0D9488;
  --accent-dim: rgba(13, 148, 136, 0.08);
  --accent-hover: #0F766E;
  --border: #E4E4E7;
  --border-hover: #D4D4D8;
  --shadow-card: 0 1px 3px rgba(0, 0, 0, 0.06);
  --shadow-card-hover: 0 4px 12px rgba(0, 0, 0, 0.1);
  --code-keyword: #7C3AED;
  --code-string: #16A34A;
  --code-key: #0891B2;
  --code-value: #EA580C;
  --tab-bg: #FAFAFA;
  --tab-active-bg: #F4F4F5;
  --diagram-line: #D4D4D8;
  --diagram-box-bg: #FFFFFF;
}

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

body {
  font-family: 'DM Sans', system-ui, -apple-system, sans-serif;
  background-color: var(--bg-primary);
  color: var(--text-primary);
  line-height: 1.6;
  transition: background-color 0.15s ease, color 0.15s ease;
}

a {
  color: var(--accent);
  text-decoration: none;
  transition: color 0.15s ease;
}

a:hover {
  color: var(--accent-hover);
}

/* ===== Layout ===== */
.container {
  max-width: 1080px;
  margin: 0 auto;
  padding: 0 24px;
}

section {
  padding: 96px 0;
}

section + section {
  border-top: 1px solid var(--border);
}

/* ===== Nav ===== */
.nav {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  z-index: 100;
  background: var(--bg-primary);
  border-bottom: 1px solid var(--border);
  backdrop-filter: blur(12px);
  background: rgba(10, 10, 11, 0.85);
  transition: background 0.15s ease;
}

[data-theme="light"] .nav {
  background: rgba(250, 250, 250, 0.85);
}

.nav-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 56px;
}

.nav-brand {
  font-weight: 600;
  font-size: 0.95rem;
  color: var(--text-primary);
  letter-spacing: -0.01em;
}

.nav-links {
  display: flex;
  align-items: center;
  gap: 28px;
}

.nav-links a {
  color: var(--text-secondary);
  font-size: 0.875rem;
  font-weight: 500;
  transition: color 0.15s ease;
}

.nav-links a:hover {
  color: var(--text-primary);
}

.theme-toggle {
  background: none;
  border: 1px solid var(--border);
  border-radius: 8px;
  width: 36px;
  height: 36px;
  cursor: pointer;
  display: flex;
  align-items: center;
  justify-content: center;
  color: var(--text-secondary);
  transition: border-color 0.15s ease, color 0.15s ease;
}

.theme-toggle:hover {
  border-color: var(--border-hover);
  color: var(--text-primary);
}

.theme-toggle svg {
  width: 18px;
  height: 18px;
}

/* ===== Hero ===== */
.hero {
  padding: 160px 0 96px;
  text-align: center;
}

.hero-badge {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 6px 14px;
  border-radius: 100px;
  border: 1px solid var(--border);
  background: var(--bg-secondary);
  font-size: 0.8rem;
  color: var(--text-secondary);
  font-weight: 500;
  margin-bottom: 32px;
}

.hero-badge .dot {
  width: 6px;
  height: 6px;
  border-radius: 50%;
  background: var(--accent);
}

.hero h1 {
  font-size: clamp(2.25rem, 5vw, 3.5rem);
  font-weight: 700;
  letter-spacing: -0.035em;
  line-height: 1.1;
  margin-bottom: 20px;
  color: var(--text-primary);
}

.hero h1 .accent {
  color: var(--accent);
}

.hero .subtitle {
  font-size: 1.125rem;
  color: var(--text-secondary);
  max-width: 560px;
  margin: 0 auto 40px;
  line-height: 1.7;
}

.hero-actions {
  display: flex;
  gap: 12px;
  justify-content: center;
  flex-wrap: wrap;
}

.btn {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 10px 20px;
  border-radius: 8px;
  font-size: 0.9rem;
  font-weight: 500;
  font-family: inherit;
  cursor: pointer;
  transition: all 0.15s ease;
  border: 1px solid transparent;
}

.btn-primary {
  background: var(--accent);
  color: #0A0A0B;
  border-color: var(--accent);
}

.btn-primary:hover {
  background: var(--accent-hover);
  border-color: var(--accent-hover);
  color: #0A0A0B;
}

.btn-secondary {
  background: transparent;
  color: var(--text-primary);
  border-color: var(--border);
}

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

/* ===== Section Headers ===== */
.section-label {
  font-size: 0.8rem;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.08em;
  color: var(--accent);
  margin-bottom: 12px;
}

.section-title {
  font-size: 1.75rem;
  font-weight: 700;
  letter-spacing: -0.025em;
  margin-bottom: 12px;
}

.section-desc {
  font-size: 1rem;
  color: var(--text-secondary);
  max-width: 600px;
  line-height: 1.7;
}

.section-header {
  margin-bottom: 56px;
}

/* ===== What is MCP ===== */
.mcp-explainer {
  background: var(--bg-secondary);
  border: 1px solid var(--border);
  border-radius: 12px;
  padding: 32px;
  max-width: 720px;
  line-height: 1.8;
  color: var(--text-secondary);
  font-size: 1rem;
}

.mcp-explainer strong {
  color: var(--text-primary);
  font-weight: 600;
}

/* ===== Tools Grid ===== */
.tools-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 16px;
}

.tool-card {
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: 10px;
  padding: 24px;
  transition: border-color 0.15s ease, box-shadow 0.15s ease, transform 0.15s ease;
}

.tool-card:hover {
  border-color: var(--border-hover);
  box-shadow: var(--shadow-card-hover);
  transform: translateY(-1px);
}

.tool-card .tool-icon {
  width: 36px;
  height: 36px;
  border-radius: 8px;
  background: var(--accent-dim);
  display: flex;
  align-items: center;
  justify-content: center;
  margin-bottom: 14px;
  color: var(--accent);
  font-size: 1rem;
}

.tool-card h3 {
  font-size: 0.95rem;
  font-weight: 600;
  margin-bottom: 6px;
  letter-spacing: -0.01em;
}

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

.tool-card code {
  font-family: 'JetBrains Mono', monospace;
  font-size: 0.75rem;
  background: var(--bg-code);
  padding: 2px 6px;
  border-radius: 4px;
  color: var(--accent);
}

/* ===== Works With ===== */
.works-with-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 20px;
}

.works-with-card {
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: 10px;
  padding: 32px;
  transition: border-color 0.15s ease, box-shadow 0.15s ease;
}

.works-with-card:hover {
  border-color: var(--border-hover);
  box-shadow: var(--shadow-card-hover);
}

.works-with-icon {
  font-size: 1.5rem;
  margin-bottom: 14px;
}

.works-with-card h3 {
  font-size: 1.05rem;
  font-weight: 600;
  margin-bottom: 8px;
  letter-spacing: -0.01em;
}

.works-with-card p {
  font-size: 0.9rem;
  color: var(--text-secondary);
  line-height: 1.7;
}

/* ===== Architecture / How It Works ===== */
.architecture-diagram {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 0;
  padding: 48px 0;
  flex-wrap: wrap;
}

.arch-box {
  background: var(--diagram-box-bg);
  border: 1px solid var(--border);
  border-radius: 10px;
  padding: 24px 32px;
  text-align: center;
  min-width: 160px;
}

.arch-box .arch-label {
  font-size: 0.75rem;
  color: var(--text-tertiary);
  text-transform: uppercase;
  letter-spacing: 0.06em;
  margin-bottom: 8px;
}

.arch-box .arch-name {
  font-size: 1rem;
  font-weight: 600;
  color: var(--text-primary);
}

.arch-box .arch-detail {
  font-size: 0.8rem;
  color: var(--text-secondary);
  margin-top: 4px;
}

.arch-arrow {
  color: var(--text-tertiary);
  font-size: 1.25rem;
  padding: 0 20px;
  flex-shrink: 0;
}

/* ===== Demo ===== */
.demo-content {
  display: flex;
  flex-direction: column;
  gap: 40px;
}

.video-wrapper {
  position: relative;
  padding-bottom: 56.25%;
  height: 0;
  border-radius: 12px;
  overflow: hidden;
  border: 1px solid var(--border);
  background: var(--bg-secondary);
}

.video-wrapper iframe {
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  border: none;
}

.demo-screenshots {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 16px;
}

.demo-screenshots img {
  width: 100%;
  border-radius: 10px;
  border: 1px solid var(--border);
}

/* ===== Quick Start ===== */
.tabs {
  display: flex;
  gap: 0;
  border-bottom: 1px solid var(--border);
  margin-bottom: 0;
}

.tab-btn {
  padding: 10px 20px;
  border: none;
  background: var(--tab-bg);
  color: var(--text-tertiary);
  font-size: 0.85rem;
  font-weight: 500;
  font-family: inherit;
  cursor: pointer;
  border-bottom: 2px solid transparent;
  transition: color 0.15s ease, border-color 0.15s ease;
}

.tab-btn.active {
  color: var(--accent);
  border-bottom-color: var(--accent);
}

.tab-btn:hover {
  color: var(--text-secondary);
}

.tab-panel {
  display: none;
  background: var(--bg-code);
  border: 1px solid var(--border);
  border-top: none;
  border-radius: 0 0 10px 10px;
  padding: 24px;
  overflow-x: auto;
}

.tab-panel.active {
  display: block;
}

.tab-panel pre {
  margin: 0;
  font-family: 'JetBrains Mono', monospace;
  font-size: 0.85rem;
  line-height: 1.7;
  color: var(--text-primary);
}

.tab-panel .comment {
  color: var(--text-tertiary);
}

.tab-panel .keyword {
  color: var(--code-keyword);
}

.tab-panel .string {
  color: var(--code-string);
}

.tab-panel .key {
  color: var(--code-key);
}

.tab-panel .value {
  color: var(--code-value);
}

.quick-start-steps {
  margin-top: 40px;
}

.step {
  display: flex;
  gap: 16px;
  margin-bottom: 28px;
}

.step-num {
  flex-shrink: 0;
  width: 28px;
  height: 28px;
  border-radius: 50%;
  background: var(--accent-dim);
  color: var(--accent);
  font-size: 0.8rem;
  font-weight: 600;
  display: flex;
  align-items: center;
  justify-content: center;
}

.step-content h4 {
  font-size: 0.95rem;
  font-weight: 600;
  margin-bottom: 4px;
}

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

.step-content code {
  font-family: 'JetBrains Mono', monospace;
  font-size: 0.8rem;
  background: var(--bg-code);
  padding: 2px 6px;
  border-radius: 4px;
}

/* ===== Footer ===== */
.footer {
  border-top: 1px solid var(--border);
  padding: 40px 0;
}

.footer-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  flex-wrap: wrap;
  gap: 16px;
}

.footer-disclaimer {
  width: 100%;
  font-size: 0.8rem;
  color: var(--text-tertiary);
  margin-bottom: 8px;
}

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

.footer-left a {
  color: var(--text-secondary);
}

.footer-left a:hover {
  color: var(--accent);
}

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

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

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

/* ===== Scroll Animations ===== */
.fade-up {
  opacity: 0;
  transform: translateY(16px);
  transition: opacity 0.4s ease, transform 0.4s ease;
}

.fade-up.visible {
  opacity: 1;
  transform: translateY(0);
}

/* ===== Responsive ===== */
@media (max-width: 768px) {
  section {
    padding: 64px 0;
  }

  .hero {
    padding: 120px 0 64px;
  }

  .hero h1 {
    font-size: 2rem;
  }

  .tools-grid {
    grid-template-columns: 1fr;
  }

  .works-with-grid {
    grid-template-columns: 1fr;
  }

  .architecture-diagram {
    flex-direction: column;
    gap: 12px;
  }

  .arch-arrow {
    transform: rotate(90deg);
    padding: 8px 0;
  }

  .demo-screenshots {
    grid-template-columns: 1fr;
  }

  .nav-links a.nav-hide-mobile {
    display: none;
  }

  .footer-inner {
    flex-direction: column;
    text-align: center;
  }
}

@media (max-width: 480px) {
  .container {
    padding: 0 16px;
  }

  .hero-actions {
    flex-direction: column;
    align-items: center;
  }

  .btn {
    width: 100%;
    justify-content: center;
  }
}