/* Spec4 AI — styles.css */

/* ===== CSS Variables ===== */
:root {
  --color-primary: #1E88E5;
  --color-primary-light: #42A5F5;
  --color-primary-dark: #1565C0;
  --color-accent: #39FF14;
  --color-accent-dim: rgba(57, 255, 20, 0.12);

  --color-background: #0a0a0f;
  --color-surface: #12121a;
  --color-surface-elevated: #1a1a24;
  --color-border: #2a2a3a;
  --color-border-light: #3a3a4a;

  --color-text: #f5f5f7;
  --color-text-muted: #a0a0b0;
  --color-text-dim: #6a6a7a;

  --grid-color: rgba(30, 136, 229, 0.07);
  --grid-color-strong: rgba(30, 136, 229, 0.13);

  --font-sans: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;
  --font-mono: 'JetBrains Mono', 'Fira Code', monospace;

  --space-xs: 0.25rem;
  --space-sm: 0.5rem;
  --space-md: 1rem;
  --space-lg: 1.5rem;
  --space-xl: 2rem;
  --space-2xl: 3rem;
  --space-3xl: 4rem;
  --space-4xl: 6rem;

  --radius-sm: 0.375rem;
  --radius-md: 0.5rem;
  --radius-lg: 0.75rem;
  --radius-xl: 1rem;

  --transition-fast: 150ms ease;
  --transition-base: 250ms ease;
  --nav-height: 64px;
}

/* ===== Reset ===== */
*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }
html { scroll-behavior: smooth; -webkit-font-smoothing: antialiased; -moz-osx-font-smoothing: grayscale; }
body { font-family: var(--font-sans); font-size: 1rem; line-height: 1.6; color: var(--color-text); background-color: var(--color-background); overflow-x: hidden; }
a { color: inherit; text-decoration: none; }
img { max-width: 100%; height: auto; display: block; }
button { font-family: inherit; cursor: pointer; border: none; background: none; }

/* ===== Blueprint Grid ===== */
.blueprint-grid {
  position: fixed; top: 0; left: 0; right: 0; bottom: 0;
  pointer-events: none; z-index: -1;
  background-image:
    linear-gradient(var(--grid-color) 1px, transparent 1px),
    linear-gradient(90deg, var(--grid-color) 1px, transparent 1px),
    linear-gradient(var(--grid-color-strong) 1px, transparent 1px),
    linear-gradient(90deg, var(--grid-color-strong) 1px, transparent 1px);
  background-size: 20px 20px, 20px 20px, 100px 100px, 100px 100px;
}

/* ===== Navigation ===== */
.nav {
  position: fixed; top: 0; left: 0; right: 0; z-index: 100;
  height: var(--nav-height);
  background: rgba(10, 10, 15, 0.85);
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
  border-bottom: 1px solid var(--color-border);
  transition: background var(--transition-fast);
}

.nav-container {
  max-width: 1200px; margin: 0 auto;
  padding: 0 var(--space-lg);
  height: 100%;
  display: flex; align-items: center; justify-content: space-between;
}

.nav-logo { font-size: 1.375rem; font-weight: 700; letter-spacing: -0.02em; }
.logo-spec { color: var(--color-primary); }
.logo-4 { color: var(--color-accent); }
.logo-ai { color: var(--color-primary); }

.nav-links { display: flex; align-items: center; gap: var(--space-xl); }

.nav-links > a {
  font-size: 0.9375rem; font-weight: 500;
  color: var(--color-text-muted);
  transition: color var(--transition-fast);
}
.nav-links > a:hover,
.nav-links > a[aria-current="page"] { color: var(--color-text); }

/* Dropdown */
.nav-dropdown { position: relative; }

.nav-dropdown-toggle {
  display: flex; align-items: center; gap: 4px;
  font-size: 0.9375rem; font-weight: 500;
  color: var(--color-text-muted);
  cursor: pointer;
  transition: color var(--transition-fast);
}
.nav-dropdown-toggle:hover,
.nav-dropdown.open .nav-dropdown-toggle { color: var(--color-text); }

.dropdown-arrow { font-size: 0.75rem; transition: transform var(--transition-fast); display: inline-block; }
.nav-dropdown.open .dropdown-arrow { transform: rotate(180deg); }

.nav-dropdown-menu {
  display: none;
  position: absolute; top: calc(100% + 14px); left: 50%;
  transform: translateX(-50%);
  min-width: 180px;
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
  padding: var(--space-sm);
  box-shadow: 0 16px 40px rgba(0,0,0,0.5);
}
.nav-dropdown.open .nav-dropdown-menu { display: block; }

.nav-dropdown-menu a {
  display: block;
  padding: var(--space-sm) var(--space-md);
  font-size: 0.9375rem;
  color: var(--color-text-muted);
  border-radius: var(--radius-md);
  transition: all var(--transition-fast);
}
.nav-dropdown-menu a:hover { color: var(--color-text); background: var(--color-surface-elevated); }

.nav-github {
  display: inline-flex;
  align-items: center;
  opacity: 0.75;
  transition: opacity var(--transition-fast);
}
.nav-github:hover { opacity: 1; }
.nav-github img {
  width: 22px; height: 22px;
  filter: invert(1);
  display: block;
}

.nav-cta {
  display: inline-flex; align-items: center; gap: var(--space-sm);
  padding: 0.5rem 1.125rem;
  font-size: 0.875rem; font-weight: 600;
  background: var(--color-primary);
  color: white !important;
  border-radius: var(--radius-md);
  transition: all var(--transition-fast);
  white-space: nowrap;
}
.nav-cta:hover {
  background: var(--color-primary-light);
  transform: translateY(-1px);
  box-shadow: 0 4px 16px rgba(30,136,229,0.35);
}

.nav-toggle {
  display: none; flex-direction: column; gap: 5px;
  padding: var(--space-sm);
}
.nav-toggle span {
  display: block; width: 22px; height: 2px;
  background: var(--color-text); border-radius: 2px;
  transition: var(--transition-fast);
}

/* Mobile menu */
.mobile-menu {
  display: none;
  position: fixed; top: var(--nav-height); left: 0; right: 0;
  background: var(--color-surface);
  border-bottom: 1px solid var(--color-border);
  padding: var(--space-md) var(--space-lg) var(--space-lg);
  flex-direction: column; gap: 2px;
  z-index: 99;
}
.mobile-menu.active { display: flex; }

.mobile-menu a {
  font-size: 0.9375rem; font-weight: 500;
  color: var(--color-text-muted);
  padding: var(--space-sm) var(--space-md);
  border-radius: var(--radius-md);
  transition: all var(--transition-fast);
}
.mobile-menu a:hover { color: var(--color-text); background: var(--color-surface-elevated); }
.mobile-menu a.mobile-cta {
  display: inline-flex; align-items: center;
  background: var(--color-primary); color: white;
  margin-top: var(--space-sm); border-radius: var(--radius-md);
}

.mobile-divider { height: 1px; background: var(--color-border); margin: var(--space-sm) 0; }
.mobile-label {
  font-size: 0.6875rem; font-weight: 700;
  color: var(--color-text-dim);
  text-transform: uppercase; letter-spacing: 0.12em;
  padding: var(--space-sm) var(--space-md) 0;
}

/* ===== Buttons ===== */
.btn {
  display: inline-flex; align-items: center; justify-content: center;
  gap: var(--space-sm);
  padding: var(--space-md) var(--space-xl);
  font-size: 1rem; font-weight: 600;
  border-radius: var(--radius-md);
  transition: all var(--transition-fast);
  white-space: nowrap;
  cursor: pointer;
}

.btn-primary { background: var(--color-primary); color: white; border: 1px solid var(--color-primary); }
.btn-primary:hover {
  background: var(--color-primary-light); border-color: var(--color-primary-light);
  transform: translateY(-2px); box-shadow: 0 8px 24px rgba(30,136,229,0.3);
}

.btn-secondary { background: transparent; color: var(--color-text); border: 1px solid var(--color-border); }
.btn-secondary:hover { background: var(--color-surface-elevated); border-color: var(--color-border-light); }

/* ===== Shared Layout ===== */
.section-container { max-width: 1200px; margin: 0 auto; padding: 0 var(--space-lg); }

.section-header { text-align: center; margin-bottom: var(--space-3xl); }

.section-label {
  display: inline-block;
  font-size: 0.8125rem; font-weight: 600;
  color: var(--color-primary);
  text-transform: uppercase; letter-spacing: 0.12em;
  margin-bottom: var(--space-md);
}

.section-title {
  font-size: clamp(2rem, 4vw, 3rem);
  font-weight: 700; letter-spacing: -0.02em;
  margin-bottom: var(--space-md);
}

.section-description {
  font-size: 1.125rem; color: var(--color-text-muted);
  max-width: 600px; margin: 0 auto; line-height: 1.7;
}

/* ===== Landing Hero ===== */
.hero {
  min-height: 100vh; display: flex; align-items: center;
  padding: var(--space-4xl) var(--space-lg);
  padding-top: calc(var(--space-4xl) + var(--nav-height));
}

.hero-container { max-width: 920px; margin: 0 auto; text-align: center; }

.hero-badge {
  display: inline-flex; align-items: center; gap: var(--space-sm);
  padding: var(--space-sm) var(--space-md);
  background: var(--color-accent-dim);
  border: 1px solid rgba(57, 255, 20, 0.3);
  border-radius: 100px;
  font-size: 0.875rem; font-weight: 500;
  color: var(--color-accent);
  margin-bottom: var(--space-xl);
}

.badge-dot {
  width: 8px; height: 8px;
  background: var(--color-accent); border-radius: 50%;
  animation: pulse 2s infinite;
}
@keyframes pulse { 0%, 100% { opacity: 1; } 50% { opacity: 0.4; } }

.hero-title {
  font-size: clamp(2.5rem, 6vw, 4rem);
  font-weight: 700; line-height: 1.1; letter-spacing: -0.03em;
  margin-bottom: var(--space-lg);
}
.hero-title span { display: block; }

.text-gradient {
  background: linear-gradient(135deg, var(--color-primary) 0%, var(--color-accent) 100%);
  -webkit-background-clip: text; -webkit-text-fill-color: transparent; background-clip: text;
}

.hero-description {
  font-size: 1.25rem; color: var(--color-text-muted);
  max-width: 660px; margin: 0 auto var(--space-2xl); line-height: 1.7;
}

.hero-actions {
  display: flex; gap: var(--space-md); justify-content: center;
  flex-wrap: wrap; margin-bottom: var(--space-xl);
}

.hero-testimonial {
  max-width: 580px; margin: 0 auto;
  padding: var(--space-lg) var(--space-xl);
  border: 1px solid var(--color-border);
  border-left: 3px solid var(--color-accent);
  border-radius: var(--radius-md);
  background: rgba(57, 255, 20, 0.03);
  text-align: left;
}

.hero-testimonial p {
  font-size: 0.9375rem; line-height: 1.7;
  color: var(--color-text-muted);
  font-style: italic;
  margin-bottom: var(--space-sm);
}

.hero-testimonial cite {
  font-size: 0.8125rem; font-style: normal;
  color: var(--color-text-dim);
}

.hero-testimonial cite a {
  color: var(--color-text-dim);
  text-decoration: underline;
  text-decoration-color: var(--color-border-light);
  transition: color var(--transition-fast);
}

.hero-testimonial cite a:hover { color: var(--color-text-muted); }

/* Pipeline Diagram */
.pipeline-diagram {
  display: flex; align-items: stretch;
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-xl);
  overflow: hidden;
  text-align: left;
}

.pipeline-node {
  flex: 1; padding: var(--space-xl) var(--space-lg);
  border-right: 1px solid var(--color-border);
  position: relative;
  transition: background var(--transition-fast);
}
.pipeline-node:last-child { border-right: none; }
.pipeline-node:hover { background: var(--color-surface-elevated); }

.pipeline-node-arrow {
  position: absolute; right: -11px; top: 50%;
  transform: translateY(-50%);
  color: var(--color-primary); font-size: 1rem; z-index: 1;
  background: var(--color-background);
  line-height: 1;
}
.pipeline-node:last-child .pipeline-node-arrow { display: none; }

.pipeline-node-num {
  font-family: var(--font-mono);
  font-size: 0.6875rem; font-weight: 700;
  color: var(--color-primary); letter-spacing: 0.1em;
  margin-bottom: var(--space-sm);
}

.pipeline-node-name {
  font-size: 1rem; font-weight: 700;
  color: var(--color-text); margin-bottom: var(--space-xs);
}

.pipeline-node-desc {
  font-size: 0.8125rem; color: var(--color-text-dim); line-height: 1.4;
}

.pipeline-node-optional {
  display: inline-block; margin-top: var(--space-sm);
  font-size: 0.6875rem; color: var(--color-text-dim);
  border: 1px solid var(--color-border); border-radius: 100px;
  padding: 2px 8px;
}

/* ===== Demo Video Section ===== */
.video-section { padding: var(--space-4xl) 0; }
.video-wrap {
  position: relative;
  width: 100%;
  max-width: 860px;
  margin: 0 auto;
  aspect-ratio: 16 / 9;
  border-radius: 12px;
  overflow: hidden;
  box-shadow: 0 0 0 1px rgba(255,255,255,0.08), 0 24px 64px rgba(0,0,0,0.6);
}
.video-wrap iframe {
  position: absolute;
  inset: 0;
  width: 100%;
  height: 100%;
  border: none;
}

/* ===== Problem Section ===== */
.problem-section { padding: var(--space-4xl) 0; }

.problem-content {}

.problem-content .section-title { text-align: left; }

.problem-body {
  font-size: 1.0625rem; color: var(--color-text-muted); line-height: 1.8;
}
.problem-body + .problem-body { margin-top: var(--space-lg); }
.problem-body em { color: var(--color-text); font-style: italic; }

/* ===== Pipeline Bar ===== */
.pipeline-bar {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 0.5rem;
  margin-bottom: var(--space-2xl);
  flex-wrap: wrap;
}

.pipeline-pill {
  display: inline-flex;
  align-items: center;
  gap: 0.375rem;
  padding: 0.3125rem 0.875rem;
  border-radius: 100px;
  font-family: var(--font-mono);
  font-size: 0.6875rem;
  font-weight: 700;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  white-space: nowrap;
}

.pipeline-pill.codescanner { background: rgba(57,255,20,0.12);   border: 1px solid rgba(57,255,20,0.35);   color: #39FF14; }
.pipeline-pill.brainstormer{ background: rgba(233,30,140,0.12);  border: 1px solid rgba(233,30,140,0.35);  color: #E91E8C; }
.pipeline-pill.stackadvisor{ background: rgba(30,136,229,0.12);  border: 1px solid rgba(30,136,229,0.35);  color: #64B5F6; }
.pipeline-pill.phaser      { background: rgba(255,189,46,0.12);  border: 1px solid rgba(255,189,46,0.35);  color: #FFBD2E; }
.pipeline-pill.deployer    { background: rgba(0,188,212,0.12);   border: 1px solid rgba(0,188,212,0.35);   color: #00BCD4; }
.pipeline-pill.designer    { background: rgba(255,112,67,0.12);  border: 1px solid rgba(255,112,67,0.35);  color: #FF7043; }

.pipeline-arrow { color: var(--color-text-dim); font-size: 0.875rem; user-select: none; }

/* ===== Agent Cards (landing teaser) ===== */
.agents-section { padding: var(--space-4xl) 0; }

.agent-cards-grid {
  display: grid; grid-template-columns: repeat(3, 1fr);
  gap: var(--space-md); margin-bottom: var(--space-2xl);
}

.agent-teaser-card {
  padding: var(--space-xl);
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
  transition: all var(--transition-base);
  display: flex; flex-direction: column;
}
.agent-teaser-card:hover {
  border-color: var(--color-primary);
  transform: translateY(-4px);
  box-shadow: 0 12px 32px rgba(30,136,229,0.15);
}

.agent-card-header {
  display: flex;
  align-items: baseline;
  gap: var(--space-sm);
  margin-bottom: var(--space-sm);
}

.agent-card-num {
  font-family: var(--font-mono);
  font-size: 0.6875rem; font-weight: 700;
  color: var(--color-primary); letter-spacing: 0.1em;
  flex-shrink: 0;
}

.agent-card-name {
  font-size: 1.125rem; font-weight: 700;
  color: var(--color-text);
}

.agent-card-optional {
  font-size: 0.75rem; color: var(--color-text-dim);
  flex-shrink: 0;
}

.agent-card-desc {
  font-size: 0.9rem; color: var(--color-text-muted);
  line-height: 1.6; flex: 1; margin-bottom: var(--space-md);
}

.output-badge {
  font-family: var(--font-mono);
  font-size: 0.75rem;
  color: var(--color-accent);
  background: rgba(57, 255, 20, 0.08);
  border: 1px solid rgba(57, 255, 20, 0.2);
  padding: 2px 8px;
  border-radius: 4px;
  display: inline-block;
}

.section-cta { text-align: center; }

.text-link {
  display: inline-flex; align-items: center; gap: var(--space-sm);
  font-size: 1rem; font-weight: 600; color: var(--color-primary);
  transition: gap var(--transition-fast);
}
.text-link:hover { gap: var(--space-md); color: var(--color-primary-light); }

/* ===== Terminal Quote ===== */
.example-section { padding: var(--space-4xl) 0; }

.example-wrap { max-width: 820px; margin: 0 auto; }

.terminal-block {
  background: #07070d;
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
  overflow: hidden; margin-bottom: var(--space-xl);
}

.terminal-titlebar {
  display: flex; align-items: center; gap: var(--space-sm);
  padding: var(--space-sm) var(--space-md);
  background: var(--color-surface-elevated);
  border-bottom: 1px solid var(--color-border);
}

.term-dot { width: 12px; height: 12px; border-radius: 50%; }
.term-dot:nth-child(1) { background: #ff5f56; }
.term-dot:nth-child(2) { background: #ffbd2e; }
.term-dot:nth-child(3) { background: #27ca40; }

.terminal-title {
  flex: 1; text-align: center;
  font-family: var(--font-mono); font-size: 0.6875rem;
  color: var(--color-text-dim);
}

.terminal-body {
  padding: var(--space-xl);
  font-family: var(--font-mono);
  font-size: 0.9375rem; line-height: 1.8;
}

.terminal-prompt { color: var(--color-accent); font-weight: 700; margin-right: var(--space-sm); }
.terminal-quote { color: var(--color-text); }

.example-followup {
  font-size: 1.0625rem; color: var(--color-text-muted);
  line-height: 1.75; text-align: center;
  margin-bottom: var(--space-xl);
}

/* ===== Page Hero (non-landing) ===== */
.page-hero-wrap {
  padding: calc(var(--space-3xl) + var(--nav-height)) var(--space-lg) var(--space-3xl);
}

.page-hero {
  max-width: 800px; margin: 0 auto; text-align: center;
}

.page-hero-title {
  font-size: clamp(2.25rem, 5vw, 3.5rem);
  font-weight: 700; line-height: 1.1; letter-spacing: -0.03em;
  margin-bottom: var(--space-lg);
}

.page-hero-sub {
  font-size: 1.1875rem; color: var(--color-text-muted);
  line-height: 1.7; max-width: 680px; margin: 0 auto;
}

/* ===== Agent Page Hero ===== */
.agent-hero-wrap {
  padding: calc(var(--space-3xl) + var(--nav-height)) var(--space-lg) var(--space-3xl);
}

.agent-hero { max-width: 800px; margin: 0 auto; text-align: center; }

.agent-hero-badge {
  display: inline-flex; align-items: center; gap: var(--space-sm);
  padding: var(--space-sm) var(--space-lg);
  background: rgba(30,136,229,0.1);
  border: 1px solid rgba(30,136,229,0.3);
  border-radius: 100px;
  font-family: var(--font-mono);
  font-size: 0.8125rem; font-weight: 600;
  color: var(--color-primary); letter-spacing: 0.08em;
  margin-bottom: var(--space-lg);
}

.agent-hero-title {
  font-size: clamp(2.5rem, 6vw, 4rem);
  font-weight: 700; line-height: 1.1; letter-spacing: -0.03em;
  margin-bottom: var(--space-md);
}

.agent-hero-sub {
  font-size: 1.125rem; color: var(--color-primary-light);
  font-style: italic; margin-bottom: var(--space-lg);
}

.agent-hero-desc {
  font-size: 1.125rem; color: var(--color-text-muted);
  line-height: 1.75; max-width: 660px; margin: 0 auto;
}

/* ===== Content Sections ===== */
.content-section { padding: var(--space-4xl) 0; }
.content-section + .content-section { border-top: 1px solid var(--color-border); }

.content-section h2 {
  font-size: clamp(1.75rem, 3.5vw, 2.5rem);
  font-weight: 700; letter-spacing: -0.02em;
  margin-bottom: var(--space-xl);
}

.body-text {
  font-size: 1.0625rem; color: var(--color-text-muted);
  line-height: 1.8;
}
.body-text + .body-text { margin-top: var(--space-lg); }
.body-text em { color: var(--color-text); font-style: italic; }

/* ===== Steps Layout (How It Works) ===== */
.steps-section { padding: var(--space-4xl) 0; }

.step-item {
  display: grid; grid-template-columns: 1fr 1fr;
  gap: var(--space-4xl); align-items: center;
  padding: var(--space-4xl) 0;
  border-top: 1px solid var(--color-border);
}
.step-item:first-child { border-top: none; padding-top: 0; }

.step-item.reverse .step-content { order: 2; }
.step-item.reverse .step-visual { order: 1; }

.step-badge {
  display: inline-flex; align-items: center; justify-content: center;
  width: 40px; height: 40px;
  background: rgba(30,136,229,0.1);
  border: 1px solid rgba(30,136,229,0.3);
  border-radius: var(--radius-md);
  font-family: var(--font-mono);
  font-size: 0.875rem; font-weight: 700;
  color: var(--color-primary); margin-bottom: var(--space-lg);
}

.step-optional {
  display: inline-block; margin-left: var(--space-sm);
  font-size: 0.6875rem; color: var(--color-text-dim);
  border: 1px solid var(--color-border); border-radius: 100px;
  padding: 2px 8px; font-family: var(--font-mono);
  vertical-align: middle;
}

.step-heading {
  font-size: clamp(1.625rem, 3vw, 2.25rem);
  font-weight: 700; line-height: 1.2; letter-spacing: -0.02em;
  margin-bottom: var(--space-lg);
}

.step-body {
  font-size: 1.0625rem; color: var(--color-text-muted);
  line-height: 1.75; margin-bottom: var(--space-xl);
}

.step-output {
  display: inline-flex; align-items: center; gap: var(--space-sm);
  font-size: 0.8125rem;
  color: var(--color-text-muted);
  margin-bottom: var(--space-lg);
  padding: var(--space-sm) var(--space-md);
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-sm);
}

.step-output-dot { width: 8px; height: 8px; background: var(--color-accent); border-radius: 50%; }

.step-output code {
  font-family: var(--font-mono); font-size: 0.8125rem;
  color: var(--color-accent);
}

.step-link {
  display: inline-flex; align-items: center; gap: var(--space-sm);
  font-size: 0.9375rem; font-weight: 600; color: var(--color-primary);
  transition: gap var(--transition-fast);
}
.step-link:hover { gap: var(--space-md); color: var(--color-primary-light); }

/* ===== Screenshot Frame ===== */
.screenshot-frame {
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
  overflow: hidden;
  box-shadow: 0 16px 48px rgba(0,0,0,0.4);
}

.screenshot-chrome {
  display: flex; align-items: center; gap: 6px;
  padding: 10px 14px;
  background: var(--color-surface-elevated);
  border-bottom: 1px solid var(--color-border);
}

.chrome-dot { width: 12px; height: 12px; border-radius: 50%; }
.chrome-dot:nth-child(1) { background: #ff5f56; }
.chrome-dot:nth-child(2) { background: #ffbd2e; }
.chrome-dot:nth-child(3) { background: #27ca40; }

.chrome-title {
  flex: 1; text-align: center;
  font-family: var(--font-mono); font-size: 0.6875rem; color: var(--color-text-dim);
}

.screenshot-frame img { width: 100%; height: auto; }

.screenshots-trio {
  display: grid; grid-template-columns: repeat(3, 1fr);
  gap: var(--space-md);
}

/* ===== JSON Code Blocks ===== */
.json-wrap { margin-top: var(--space-xl); }

.json-label {
  font-family: var(--font-mono);
  font-size: 0.75rem; font-weight: 600;
  color: var(--color-text-dim); letter-spacing: 0.05em;
  margin-bottom: var(--space-sm);
  text-transform: uppercase;
}

.json-block {
  background: #07070c;
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
  padding: var(--space-xl);
  overflow-x: auto;
  font-family: var(--font-mono);
  font-size: 0.8125rem; line-height: 1.9;
  color: var(--color-text-muted);
  tab-size: 2;
  white-space: pre-wrap;
}

.j-key { color: var(--color-primary); }
.j-str { color: var(--color-accent); }
.j-num { color: #E5C07B; }
.j-bool { color: #C678DD; }
.j-null { color: #C678DD; }
.j-punc { color: var(--color-text-dim); }

/* ===== Conversation Block ===== */
.conv-wrap {
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
  overflow: hidden; margin-top: var(--space-xl);
}

.conv-row {
  padding: var(--space-lg) var(--space-xl);
  border-bottom: 1px solid var(--color-border);
}
.conv-row:last-child { border-bottom: none; }
.conv-row.agent-row { background: var(--color-surface-elevated); }
.conv-row.user-row { background: var(--color-surface); }

.conv-speaker {
  font-size: 0.6875rem; font-weight: 700;
  text-transform: uppercase; letter-spacing: 0.12em;
  margin-bottom: var(--space-sm);
}
.agent-row .conv-speaker { color: var(--color-primary); }
.user-row .conv-speaker { color: var(--color-accent); }

.conv-text { font-size: 0.9375rem; color: var(--color-text-muted); line-height: 1.65; }

.conv-choices { display: flex; flex-direction: column; gap: var(--space-xs); margin-top: var(--space-md); }

.conv-choice {
  display: flex; align-items: flex-start; gap: var(--space-sm);
  font-size: 0.875rem; color: var(--color-text-muted);
  padding: var(--space-sm) var(--space-md);
  background: rgba(30,136,229,0.04);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-sm);
}

.choice-num {
  font-family: var(--font-mono); font-size: 0.75rem; font-weight: 700;
  color: var(--color-primary); min-width: 20px;
}

/* ===== What It Does (area cards) ===== */
.areas-grid {
  display: grid; grid-template-columns: repeat(2, 1fr);
  gap: var(--space-md); margin-top: var(--space-xl);
}

.area-card {
  padding: var(--space-lg);
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  border-left: 3px solid var(--color-primary);
  border-radius: 0 var(--radius-md) var(--radius-md) 0;
}

.area-num {
  font-family: var(--font-mono); font-size: 0.6875rem; font-weight: 700;
  color: var(--color-primary); letter-spacing: 0.1em; margin-bottom: var(--space-sm);
}

.area-title {
  font-size: 1rem; font-weight: 600; color: var(--color-text); margin-bottom: var(--space-xs);
}

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

/* ===== Covers List (StackAdvisor) ===== */
.covers-list { display: flex; flex-direction: column; gap: var(--space-md); margin-top: var(--space-xl); }

.covers-item {
  padding: var(--space-lg) var(--space-xl);
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  display: flex; gap: var(--space-lg);
}

.covers-num {
  font-family: var(--font-mono); font-size: 0.8125rem; font-weight: 700;
  color: var(--color-primary); min-width: 2rem;
}

.covers-title {
  font-size: 1rem; font-weight: 600; color: var(--color-text); margin-bottom: var(--space-xs);
}

.covers-desc { font-size: 0.9rem; color: var(--color-text-muted); line-height: 1.6; }

/* ===== Output Label ===== */
.output-label {
  display: inline-flex; align-items: center; gap: var(--space-sm);
  font-size: 0.8125rem; font-weight: 600;
  color: var(--color-text-muted); margin-bottom: var(--space-md);
  padding: var(--space-sm) var(--space-md);
  background: var(--color-surface); border: 1px solid var(--color-border);
  border-radius: var(--radius-sm);
}

.output-dot { width: 8px; height: 8px; background: var(--color-accent); border-radius: 50%; }

/* ===== Use Cases ===== */
.use-cases {
  display: grid; grid-template-columns: repeat(2, 1fr);
  gap: var(--space-md); margin-top: var(--space-xl);
}

.use-case {
  display: flex; align-items: flex-start; gap: var(--space-md);
  padding: var(--space-lg);
  background: var(--color-surface); border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
}

.use-case-check { color: var(--color-accent); font-size: 1rem; flex-shrink: 0; margin-top: 2px; }

.use-case-text { font-size: 0.9375rem; color: var(--color-text-muted); line-height: 1.6; }

.skip-note {
  margin-top: var(--space-xl);
  padding: var(--space-lg);
  background: var(--color-surface); border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  font-size: 0.9375rem; color: var(--color-text-muted); text-align: center; line-height: 1.6;
}
.skip-note strong { color: var(--color-text); }

/* ===== Getting Started (How It Works) ===== */
.config-intro {
  font-size: 1.0625rem; color: var(--color-text-muted); line-height: 1.75;
  max-width: 700px; margin-bottom: var(--space-2xl);
}

.config-bullets { display: flex; flex-direction: column; gap: var(--space-md); margin-bottom: var(--space-2xl); }

.config-bullet {
  display: flex; gap: var(--space-md);
  padding: var(--space-lg);
  background: var(--color-surface); border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
}

.config-bullet-icon { color: var(--color-primary); font-size: 1.25rem; flex-shrink: 0; }

.config-bullet-title {
  font-size: 1rem; font-weight: 600; color: var(--color-text); margin-bottom: var(--space-xs);
}

.config-bullet-desc { font-size: 0.9rem; color: var(--color-text-muted); line-height: 1.6; }

/* ===== Phase Principle Cards (Phaser) ===== */
.principles-grid {
  display: grid; grid-template-columns: repeat(2, 1fr);
  gap: var(--space-md); margin-top: var(--space-xl);
}

.principle-card {
  padding: var(--space-xl);
  background: var(--color-surface); border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
}

.principle-title {
  font-size: 1rem; font-weight: 700; color: var(--color-text); margin-bottom: var(--space-sm);
}
.principle-title .kw { color: var(--color-primary); }

.principle-body { font-size: 0.9rem; color: var(--color-text-muted); line-height: 1.65; }

/* ===== Phaser Output Flow ===== */
.flow-steps {
  display: grid; grid-template-columns: repeat(4, 1fr);
  gap: var(--space-md); margin-top: var(--space-xl);
}

.flow-step {
  text-align: center; padding: var(--space-lg);
  background: var(--color-surface); border: 1px solid var(--color-border);
  border-radius: var(--radius-md); position: relative;
}

.flow-step-num {
  font-family: var(--font-mono); font-size: 1.75rem; font-weight: 700;
  color: var(--color-primary); opacity: 0.3; margin-bottom: var(--space-sm);
}

.flow-step-text { font-size: 0.875rem; color: var(--color-text-muted); line-height: 1.5; }

/* ===== Pipeline Table (About) ===== */
.table-wrap {
  background: var(--color-surface); border: 1px solid var(--color-border);
  border-radius: var(--radius-lg); overflow: hidden; margin-top: var(--space-xl);
}

.pipeline-table { width: 100%; border-collapse: collapse; }

.pipeline-table th {
  font-size: 0.75rem; font-weight: 600;
  color: var(--color-text-dim);
  text-transform: uppercase; letter-spacing: 0.08em;
  text-align: left; padding: var(--space-md) var(--space-xl);
  background: var(--color-surface-elevated);
  border-bottom: 1px solid var(--color-border);
}

.pipeline-table td {
  padding: var(--space-lg) var(--space-xl);
  font-size: 0.9375rem; color: var(--color-text-muted);
  border-bottom: 1px solid var(--color-border); vertical-align: top;
}
.pipeline-table tr:last-child td { border-bottom: none; }
.pipeline-table td:first-child { font-weight: 600; color: var(--color-text); }
.pipeline-table td:last-child { font-family: var(--font-mono); font-size: 0.8125rem; color: var(--color-accent); }

/* ===== For-list (About who it's for) ===== */
.for-list { display: flex; flex-direction: column; gap: var(--space-sm); margin-top: var(--space-xl); }

.for-item {
  display: flex; align-items: flex-start; gap: var(--space-md);
  padding: var(--space-lg);
  background: var(--color-surface); border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
}

.for-dot { width: 8px; height: 8px; background: var(--color-primary); border-radius: 50%; flex-shrink: 0; margin-top: 7px; }

.for-text { font-size: 0.9375rem; color: var(--color-text-muted); line-height: 1.6; }

/* ===== CTA Section ===== */
.cta-section { padding: var(--space-4xl) 0; }

.cta-card {
  text-align: center; padding: var(--space-3xl);
  background: linear-gradient(135deg, rgba(30,136,229,0.1) 0%, rgba(57,255,20,0.05) 100%);
  border: 1px solid var(--color-border); border-radius: var(--radius-xl);
}

.cta-card h2 {
  font-size: clamp(1.75rem, 3vw, 2.5rem);
  font-weight: 700; letter-spacing: -0.02em; margin-bottom: var(--space-md);
}

.cta-card p {
  font-size: 1.125rem; color: var(--color-text-muted);
  max-width: 500px; margin: 0 auto var(--space-xl); line-height: 1.7;
}

.cta-actions { display: flex; gap: var(--space-md); justify-content: center; flex-wrap: wrap; }

/* ===== Footer ===== */
.footer {
  padding: var(--space-4xl) 0 var(--space-xl);
  border-top: 1px solid var(--color-border);
}

.footer-container {
  max-width: 1200px; margin: 0 auto; padding: 0 var(--space-lg);
  display: grid; grid-template-columns: 2fr 3fr; gap: var(--space-3xl);
}

.footer-brand p {
  color: var(--color-text-muted); font-size: 0.9375rem;
  margin-top: var(--space-md); max-width: 280px; line-height: 1.6;
}

.footer-links { display: grid; grid-template-columns: repeat(3, 1fr); gap: var(--space-xl); }

.footer-column h4 {
  font-size: 0.8125rem; font-weight: 600; color: var(--color-text);
  margin-bottom: var(--space-lg); text-transform: uppercase; letter-spacing: 0.08em;
}

.footer-column a {
  display: block; font-size: 0.9375rem; color: var(--color-text-muted);
  margin-bottom: var(--space-sm); transition: color var(--transition-fast);
}
.footer-column a:hover { color: var(--color-text); }

.footer-bottom {
  max-width: 1200px; margin: var(--space-2xl) auto 0;
  padding: var(--space-xl) var(--space-lg) 0;
  border-top: 1px solid var(--color-border);
}

.footer-bottom p { font-size: 0.875rem; color: var(--color-text-dim); text-align: center; }

/* ===== Fade-in animation ===== */
.fade-in { opacity: 0; transform: translateY(18px); transition: opacity 0.55s ease, transform 0.55s ease; }
.fade-in.visible { opacity: 1; transform: translateY(0); }

/* ===== Responsive ===== */
@media (max-width: 1024px) {
  .agent-cards-grid { grid-template-columns: repeat(2, 1fr); }
  .pipeline-diagram { flex-wrap: wrap; }
  .pipeline-node { flex: 1 0 45%; }
  .pipeline-node-arrow { display: none; }
  .areas-grid { grid-template-columns: 1fr; }
  .use-cases { grid-template-columns: 1fr; }
  .principles-grid { grid-template-columns: 1fr; }
  .flow-steps { grid-template-columns: repeat(2, 1fr); }
  .step-item { grid-template-columns: 1fr; gap: var(--space-2xl); }
  .step-item.reverse .step-content,
  .step-item.reverse .step-visual { order: unset; }
  .step-content { text-align: center; }
  .step-link, .step-output, .output-label { display: inline-flex; }
  .screenshots-trio { grid-template-columns: 1fr; }
}

@media (max-width: 768px) {
  .nav-links { display: none; }
  .nav-toggle { display: flex; }

  .hero { padding: var(--space-3xl) var(--space-md); padding-top: calc(var(--space-3xl) + var(--nav-height)); }
  .hero-description { font-size: 1.0625rem; }

  .pipeline-diagram { flex-direction: column; }
  .pipeline-node { border-right: none; border-bottom: 1px solid var(--color-border); }
  .pipeline-node:last-child { border-bottom: none; }

  .page-hero-wrap,
  .agent-hero-wrap { padding: calc(var(--space-2xl) + var(--nav-height)) var(--space-md) var(--space-2xl); }

  .content-section { padding: var(--space-3xl) 0; }

  .footer-container { grid-template-columns: 1fr; gap: var(--space-2xl); }
  .footer-links { grid-template-columns: repeat(2, 1fr); }
  .footer-brand { text-align: center; }
  .footer-brand p { margin: var(--space-md) auto 0; }

  .cta-card { padding: var(--space-2xl) var(--space-lg); }

  .conv-row { padding: var(--space-md) var(--space-lg); }

  .table-wrap { overflow-x: auto; }
}

@media (max-width: 480px) {
  .hero-actions { flex-direction: column; align-items: center; }
  .btn { width: 100%; max-width: 320px; }
  .cta-actions { flex-direction: column; align-items: center; }
  .agent-cards-grid { grid-template-columns: 1fr; }
  .footer-links { grid-template-columns: 1fr; text-align: center; }
  .json-block { font-size: 0.75rem; padding: var(--space-lg); }
  .flow-steps { grid-template-columns: 1fr; }
}