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

:root {
  --bg-primary: #0d1f3c;
  --bg-surface: #132d54;
  --bg-elevated: #1a3d6e;
  --bg-card: #16366288;
  --border: #2a5a9a;
  --border-accent: #5bb8ff33;
  --text-primary: #eaf3fb;
  --text-secondary: #a3c4e0;
  --text-muted: #7ba3c4;
  --accent: #5bb8ff;
  --accent-light: #b8e0ff;
  --accent-glow: #5bb8ff18;
  --accent-warm: #ffc600;
  --accent-green: #ffc600;
  --accent-amber: #ffc600;
  --font-sans: 'Inter', -apple-system, BlinkMacSystemFont, sans-serif;
  --font-mono: 'JetBrains Mono', 'Fira Code', monospace;
  --max-width: 1100px;
  --section-padding: 6rem 2rem;
  --radius: 12px;
  --radius-sm: 8px;
  --transition: 0.3s ease;
}

html {
  scroll-behavior: smooth;
  font-size: 16px;
}

body {
  font-family: var(--font-sans);
  background: var(--bg-primary);
  color: var(--text-primary);
  line-height: 1.7;
  -webkit-font-smoothing: antialiased;
}

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

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

img {
  max-width: 100%;
  height: auto;
  display: block;
  border-radius: var(--radius-sm);
}

/* ===== Progress Bar ===== */
.progress-bar {
  position: fixed;
  top: 0;
  left: 0;
  height: 3px;
  background: linear-gradient(90deg, var(--accent), var(--accent-warm));
  z-index: 1001;
  transition: width 0.1s linear;
}

/* ===== Navigation ===== */
.navbar {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  z-index: 1000;
  background: rgba(10, 10, 15, 0.85);
  backdrop-filter: blur(20px);
  border-bottom: 1px solid var(--border);
  transition: transform var(--transition);
}

.navbar.hidden {
  transform: translateY(-100%);
}

.nav-container {
  max-width: var(--max-width);
  margin: 0 auto;
  padding: 0 2rem;
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 60px;
}

.nav-logo {
  font-weight: 700;
  font-size: 1rem;
  color: var(--text-primary);
  letter-spacing: -0.02em;
}

.nav-logo span {
  color: var(--accent);
}

.nav-links {
  display: flex;
  list-style: none;
  gap: 0.25rem;
}

.nav-links a {
  color: var(--text-secondary);
  font-size: 0.8125rem;
  font-weight: 500;
  padding: 0.375rem 0.75rem;
  border-radius: 6px;
  transition: all var(--transition);
}

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

.nav-links a.active {
  color: var(--accent-light);
  background: var(--accent-glow);
}

.nav-toggle {
  display: none;
  background: none;
  border: none;
  color: var(--text-primary);
  font-size: 1.5rem;
  cursor: pointer;
  padding: 0.25rem;
}

/* ===== Content Wrappers ===== */
.section {
  padding: var(--section-padding);
  position: relative;
}

.section:nth-child(even) {
  background: var(--bg-surface);
}

.container {
  max-width: var(--max-width);
  margin: 0 auto;
}

/* ===== Hero Section ===== */
.hero {
  min-height: 100vh;
  display: flex;
  align-items: center;
  justify-content: center;
  text-align: center;
  padding: 6rem 2rem;
  position: relative;
  overflow: hidden;
}

.hero::before {
  content: '';
  position: absolute;
  top: -50%;
  left: -50%;
  width: 200%;
  height: 200%;
  background: radial-gradient(circle at 50% 50%, var(--accent-glow) 0%, transparent 50%);
  animation: pulse 8s ease-in-out infinite;
}

@keyframes pulse {
  0%, 100% { opacity: 0.3; transform: scale(1); }
  50% { opacity: 0.6; transform: scale(1.1); }
}

.hero-content {
  position: relative;
  z-index: 1;
  max-width: 700px;
}

.hero-badge {
  display: inline-block;
  font-family: var(--font-mono);
  font-size: 0.75rem;
  color: var(--accent);
  background: var(--accent-glow);
  border: 1px solid var(--border-accent);
  padding: 0.375rem 1rem;
  border-radius: 100px;
  margin-bottom: 2rem;
  letter-spacing: 0.05em;
  text-transform: uppercase;
}

.hero h1 {
  font-size: clamp(2.5rem, 6vw, 4rem);
  font-weight: 800;
  letter-spacing: -0.03em;
  line-height: 1.1;
  margin-bottom: 1rem;
  background: linear-gradient(135deg, var(--text-primary), var(--accent-light));
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

.hero p {
  font-size: 1.125rem;
  color: var(--text-secondary);
  line-height: 1.8;
  margin-bottom: 2rem;
}

.hero-meta {
  font-size: 0.875rem;
  color: var(--text-muted);
}

.scroll-indicator {
  position: absolute;
  bottom: 2rem;
  left: 50%;
  transform: translateX(-50%);
  animation: bounce 2s infinite;
  color: var(--text-muted);
  font-size: 1.5rem;
}

@keyframes bounce {
  0%, 20%, 50%, 80%, 100% { transform: translateX(-50%) translateY(0); }
  40% { transform: translateX(-50%) translateY(-10px); }
  60% { transform: translateX(-50%) translateY(-5px); }
}

/* ===== Typography ===== */
.section-label {
  font-family: var(--font-mono);
  font-size: 0.75rem;
  color: var(--accent);
  text-transform: uppercase;
  letter-spacing: 0.1em;
  margin-bottom: 0.75rem;
}

.section-title {
  font-size: clamp(1.75rem, 3vw, 2.25rem);
  font-weight: 700;
  letter-spacing: -0.02em;
  margin-bottom: 1rem;
  line-height: 1.2;
}

.section-subtitle {
  font-size: 1.0625rem;
  color: var(--text-secondary);
  max-width: 640px;
  margin-bottom: 3rem;
  line-height: 1.7;
}

h3 {
  font-size: 1.25rem;
  font-weight: 600;
  margin-bottom: 0.75rem;
  margin-top: 2.5rem;
  color: var(--text-primary);
}

h4 {
  font-size: 1.0625rem;
  font-weight: 600;
  margin-bottom: 0.5rem;
  margin-top: 1.5rem;
  color: var(--text-primary);
}

p {
  margin-bottom: 1rem;
  color: var(--text-secondary);
}

/* ===== Cards ===== */
.card {
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 1.5rem;
  transition: border-color var(--transition);
}

.card:hover {
  border-color: var(--accent);
}

.card-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
  gap: 1.25rem;
  margin: 2rem 0;
}

.card-label {
  font-family: var(--font-mono);
  font-size: 0.6875rem;
  text-transform: uppercase;
  letter-spacing: 0.08em;
  color: var(--accent);
  margin-bottom: 0.5rem;
}

.card h4 {
  margin-top: 0;
  font-size: 1.0625rem;
}

.card p {
  font-size: 0.9375rem;
  margin-bottom: 0;
}

/* ===== Insight Cards ===== */
.insight-card {
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-left: 3px solid var(--accent);
  border-radius: var(--radius);
  padding: 1.5rem;
  margin-bottom: 1.25rem;
}

.insight-card .insight-number {
  font-family: var(--font-mono);
  font-size: 0.75rem;
  color: var(--accent);
  margin-bottom: 0.5rem;
}

.insight-card h4 {
  margin-top: 0;
  margin-bottom: 0.5rem;
}

.insight-card .so-what {
  font-size: 0.8125rem;
  color: var(--accent-warm);
  font-weight: 500;
  margin-top: 0.75rem;
  margin-bottom: 0;
}

/* ===== Quote Blocks ===== */
.quote {
  border-left: 3px solid var(--accent);
  padding: 1rem 1.5rem;
  margin: 1.5rem 0;
  background: var(--accent-glow);
  border-radius: 0 var(--radius-sm) var(--radius-sm) 0;
}

.quote p {
  font-style: italic;
  color: var(--text-primary);
  font-size: 1rem;
  margin-bottom: 0.25rem;
}

.quote cite {
  font-size: 0.8125rem;
  color: var(--text-muted);
  font-style: normal;
}

/* ===== Persona Card ===== */
.persona-card {
  background: var(--bg-elevated);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 2rem;
  display: grid;
  grid-template-columns: 200px 1fr;
  gap: 2rem;
  margin: 2rem 0;
}

.persona-avatar {
  width: 200px;
  height: 200px;
  border-radius: var(--radius);
  background: var(--bg-card);
  border: 1px solid var(--border);
  display: flex;
  align-items: center;
  justify-content: center;
  color: var(--text-muted);
  font-size: 4rem;
}

.persona-info h4 {
  margin-top: 0;
  font-size: 1.375rem;
}

.persona-meta {
  font-size: 0.875rem;
  color: var(--text-muted);
  margin-bottom: 1rem;
}

.persona-section {
  margin-bottom: 1rem;
}

.persona-section h5 {
  font-size: 0.8125rem;
  text-transform: uppercase;
  letter-spacing: 0.08em;
  color: var(--accent);
  margin-bottom: 0.375rem;
}

.persona-section ul {
  list-style: none;
  padding: 0;
}

.persona-section li {
  font-size: 0.9375rem;
  color: var(--text-secondary);
  padding: 0.25rem 0;
  padding-left: 1rem;
  position: relative;
}

.persona-section li::before {
  content: '';
  position: absolute;
  left: 0;
  top: 0.6rem;
  width: 4px;
  height: 4px;
  background: var(--accent);
  border-radius: 50%;
}

/* ===== Image Placeholders ===== */
.image-placeholder {
  background: var(--bg-elevated);
  border: 2px dashed var(--border);
  border-radius: var(--radius);
  display: flex;
  align-items: center;
  justify-content: center;
  color: var(--text-muted);
  font-size: 0.875rem;
  min-height: 200px;
  margin: 1.5rem 0;
  padding: 2rem;
  text-align: center;
}

.image-placeholder.wide {
  aspect-ratio: 16/9;
}

.image-placeholder.screens {
  aspect-ratio: 21/9;
}

.screenshot-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(160px, 1fr));
  gap: 1rem;
  margin: 1.5rem 0;
}

.screenshot-grid .image-placeholder {
  aspect-ratio: 9/16;
  min-height: auto;
  margin: 0;
}

.figma-embed {
  margin: 2rem 0;
  border-radius: var(--radius);
  overflow: hidden;
  border: 1px solid var(--border);
  background: var(--bg-elevated);
}

.figma-embed iframe {
  display: block;
  border-radius: var(--radius);
}

.figma-embed img {
  width: 100%;
  border-radius: 0;
}

.figma-embed p {
  margin: 0;
}

/* ===== Task Section ===== */
.task-block {
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 2rem;
  margin: 2rem 0;
}

.task-block .task-number {
  font-family: var(--font-mono);
  font-size: 0.6875rem;
  text-transform: uppercase;
  letter-spacing: 0.1em;
  color: var(--accent);
  margin-bottom: 0.5rem;
}

.task-block h4 {
  margin-top: 0;
  font-size: 1.25rem;
}

.task-context {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
  gap: 1rem;
  margin: 1rem 0;
  padding: 1rem;
  background: var(--bg-primary);
  border-radius: var(--radius-sm);
}

.task-context-item {
  font-size: 0.875rem;
}

.task-context-item strong {
  display: block;
  color: var(--text-muted);
  font-size: 0.75rem;
  text-transform: uppercase;
  letter-spacing: 0.05em;
  margin-bottom: 0.25rem;
}

.task-steps {
  list-style: none;
  padding: 0;
  margin: 1.5rem 0;
}

.task-steps li {
  padding: 0.5rem 0 0.5rem 2.5rem;
  position: relative;
  color: var(--text-secondary);
  font-size: 0.9375rem;
  border-left: 2px solid var(--border);
  margin-left: 0.75rem;
}

.task-steps li::before {
  content: attr(data-step);
  position: absolute;
  left: -0.75rem;
  top: 0.4rem;
  width: 1.5rem;
  height: 1.5rem;
  background: var(--accent);
  color: white;
  font-size: 0.6875rem;
  font-weight: 700;
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
}

.task-steps li:last-child {
  border-left-color: transparent;
}

/* ===== Comparison Grid ===== */
.comparison {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 1.5rem;
  margin: 2rem 0;
}

.comparison-item {
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 1.25rem;
}

.comparison-item .label {
  font-family: var(--font-mono);
  font-size: 0.6875rem;
  text-transform: uppercase;
  letter-spacing: 0.08em;
  margin-bottom: 0.75rem;
  padding: 0.25rem 0.5rem;
  border-radius: 4px;
  display: inline-block;
}

.comparison-item .label.before {
  color: var(--accent-amber);
  background: #fbbf2418;
}

.comparison-item .label.after {
  color: var(--accent-warm);
  background: #ffc60018;
}

/* ===== Integration Diagram ===== */
.integration-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
  gap: 1.25rem;
  margin: 2rem 0;
}

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

.integration-card .flow-label {
  font-family: var(--font-mono);
  font-size: 0.6875rem;
  text-transform: uppercase;
  letter-spacing: 0.08em;
  color: var(--accent-warm);
  margin-bottom: 0.5rem;
}

.integration-card h4 {
  margin-top: 0;
}

/* ===== Entry/Exit Table ===== */
.flow-table {
  width: 100%;
  border-collapse: collapse;
  margin: 1.5rem 0;
  font-size: 0.9375rem;
}

.flow-table th {
  text-align: left;
  padding: 0.75rem 1rem;
  background: var(--bg-elevated);
  border: 1px solid var(--border);
  color: var(--text-primary);
  font-weight: 600;
  font-size: 0.8125rem;
  text-transform: uppercase;
  letter-spacing: 0.05em;
}

.flow-table td {
  padding: 0.75rem 1rem;
  border: 1px solid var(--border);
  color: var(--text-secondary);
  vertical-align: top;
}

/* ===== Placeholder Section ===== */
.placeholder-notice {
  background: var(--bg-elevated);
  border: 1px dashed var(--border);
  border-radius: var(--radius);
  padding: 3rem 2rem;
  text-align: center;
  color: var(--text-muted);
  margin: 2rem 0;
}

.placeholder-notice p {
  color: var(--text-muted);
  margin-bottom: 0;
}

/* ===== Footer ===== */
.footer {
  padding: 3rem 2rem;
  text-align: center;
  border-top: 1px solid var(--border);
  color: var(--text-muted);
  font-size: 0.875rem;
}

/* ===== Animations ===== */
.fade-in {
  opacity: 0;
  transform: translateY(24px);
  transition: opacity 0.6s ease, transform 0.6s ease;
}

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

/* ===== Responsive ===== */
@media (max-width: 768px) {
  :root {
    --section-padding: 4rem 1.25rem;
  }

  .nav-links {
    display: none;
    position: absolute;
    top: 60px;
    left: 0;
    right: 0;
    background: rgba(10, 10, 15, 0.95);
    backdrop-filter: blur(20px);
    flex-direction: column;
    padding: 1rem;
    border-bottom: 1px solid var(--border);
  }

  .nav-links.open {
    display: flex;
  }

  .nav-toggle {
    display: block;
  }

  .persona-card {
    grid-template-columns: 1fr;
  }

  .persona-avatar {
    width: 120px;
    height: 120px;
    margin: 0 auto;
  }

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

  .task-context {
    grid-template-columns: 1fr;
  }

  .hero h1 {
    font-size: 2.25rem;
  }

  .screenshot-grid {
    grid-template-columns: repeat(auto-fit, minmax(120px, 1fr));
  }
}

@media (max-width: 480px) {
  .nav-logo {
    font-size: 0.875rem;
  }

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