:root {
  --bg-page: #f8fafc;
  --bg-surface: #ffffff;
  --bg-subtle: #f1f5f9;
  --bg-dark: #0b1120;
  --bg-dark-card: #111827;
  --text-primary: #0f172a;
  --text-secondary: #475569;
  --text-muted: #64748b;
  --brand-primary: #1d4ed8;
  --brand-hover: #1e40af;
  --brand-light: #eff6ff;
  --brand-border: #bfdbfe;
  --accent-emerald: #059669;
  --accent-emerald-bg: #ecfdf5;
  --accent-amber: #d97706;
  --accent-amber-bg: #fffbeb;
  --border-subtle: #e2e8f0;
  --border-strong: #cbd5e1;
  --shadow-sm: 0 1px 2px rgba(15, 23, 42, 0.05);
  --shadow-md: 0 8px 24px -4px rgba(15, 23, 42, 0.08);
  --shadow-lg: 0 20px 40px -12px rgba(15, 23, 42, 0.14);
  --radius-sm: 8px;
  --radius-md: 12px;
  --radius-lg: 18px;
  --font-sans: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
  --font-mono: 'JetBrains Mono', 'Fira Code', Consolas, monospace;
}

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

html {
  scroll-behavior: smooth;
}

body {
  font-family: var(--font-sans);
  background-color: var(--bg-page);
  color: var(--text-primary);
  line-height: 1.6;
  -webkit-font-smoothing: antialiased;
}

a {
  color: inherit;
  text-decoration: none;
}

.container {
  max-width: 1200px;
  margin: 0 auto;
  padding: 0 24px;
}

/* Navbar */
.navbar {
  position: sticky;
  top: 0;
  z-index: 100;
  background: rgba(255, 255, 255, 0.88);
  backdrop-filter: blur(12px);
  border-bottom: 1px solid var(--border-subtle);
}

.nav-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 70px;
}

.brand {
  display: flex;
  align-items: center;
  gap: 10px;
  font-weight: 700;
  font-size: 1.2rem;
  letter-spacing: -0.02em;
  color: var(--text-primary);
}

.brand-mark {
  width: 34px;
  height: 34px;
  border-radius: 9px;
  background: linear-gradient(135deg, #1d4ed8 0%, #0f172a 100%);
  color: #fff;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  font-weight: 800;
  font-size: 0.95rem;
  box-shadow: 0 4px 10px rgba(29, 78, 216, 0.25);
}

.nav-links {
  display: flex;
  align-items: center;
  gap: 28px;
  font-size: 0.94rem;
  font-weight: 500;
  color: var(--text-secondary);
}

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

.nav-actions {
  display: flex;
  align-items: center;
  gap: 12px;
}

.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  padding: 10px 18px;
  border-radius: var(--radius-sm);
  font-weight: 600;
  font-size: 0.92rem;
  transition: all 0.18s ease;
  cursor: pointer;
  border: 1px solid transparent;
}

.btn-primary {
  background: var(--brand-primary);
  color: #fff;
  box-shadow: 0 2px 8px rgba(29, 78, 216, 0.25);
}

.btn-primary:hover {
  background: var(--brand-hover);
  transform: translateY(-1px);
}

.btn-outline {
  background: #fff;
  color: var(--text-primary);
  border-color: var(--border-strong);
}

.btn-outline:hover {
  border-color: var(--brand-primary);
  color: var(--brand-primary);
  background: var(--brand-light);
}

.btn-sm {
  padding: 7px 14px;
  font-size: 0.85rem;
}

/* Hero */
.hero {
  padding: 76px 0 68px;
  background:
    radial-gradient(circle at 15% 10%, rgba(29, 78, 216, 0.07) 0%, transparent 45%),
    radial-gradient(circle at 85% 20%, rgba(5, 150, 105, 0.06) 0%, transparent 40%),
    linear-gradient(180deg, #ffffff 0%, #f8fafc 100%);
  border-bottom: 1px solid var(--border-subtle);
}

.hero-grid {
  display: grid;
  grid-template-columns: 1.05fr 1.15fr;
  gap: 48px;
  align-items: center;
}

.pill-badge {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 6px 14px;
  border-radius: 999px;
  background: var(--brand-light);
  border: 1px solid var(--brand-border);
  color: var(--brand-primary);
  font-size: 0.82rem;
  font-weight: 600;
  margin-bottom: 20px;
}

.pill-dot {
  width: 7px;
  height: 7px;
  border-radius: 50%;
  background: var(--accent-emerald);
}

.hero h1 {
  font-size: 2.85rem;
  line-height: 1.15;
  letter-spacing: -0.03em;
  margin-bottom: 20px;
  color: var(--text-primary);
}

.hero p.lead {
  font-size: 1.1rem;
  color: var(--text-secondary);
  margin-bottom: 28px;
  max-width: 540px;
}

.hero-cta {
  display: flex;
  flex-wrap: wrap;
  gap: 14px;
  margin-bottom: 28px;
}

.hero-metrics {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 16px;
  padding-top: 22px;
  border-top: 1px solid var(--border-subtle);
}

.metric-val {
  font-size: 1.25rem;
  font-weight: 700;
  color: var(--text-primary);
}

.metric-lbl {
  font-size: 0.8rem;
  color: var(--text-muted);
}

/* Mockup Preview Window */
.workbench-card {
  background: var(--bg-surface);
  border: 1px solid var(--border-strong);
  border-radius: var(--radius-lg);
  box-shadow: var(--shadow-lg);
  overflow: hidden;
}

.wb-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 12px 18px;
  background: var(--bg-subtle);
  border-bottom: 1px solid var(--border-subtle);
  font-size: 0.8rem;
  color: var(--text-secondary);
}

.wb-dots {
  display: flex;
  gap: 6px;
}

.wb-dots span {
  width: 10px;
  height: 10px;
  border-radius: 50%;
  background: #cbd5e1;
}

.wb-dots span:nth-child(1) { background: #f87171; }
.wb-dots span:nth-child(2) { background: #fbbf24; }
.wb-dots span:nth-child(3) { background: #34d399; }

.wb-body {
  padding: 20px;
}

.wb-unit {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 14px;
  padding: 14px;
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-md);
  background: #fcfdff;
  margin-bottom: 14px;
  font-size: 0.86rem;
}

.wb-col-label {
  font-family: var(--font-mono);
  font-size: 0.72rem;
  text-transform: uppercase;
  color: var(--text-muted);
  margin-bottom: 6px;
  display: flex;
  justify-content: space-between;
}

.term-lock {
  background: #dbeafe;
  color: #1e40af;
  padding: 1px 6px;
  border-radius: 4px;
  font-weight: 600;
  border-bottom: 1px dashed #3b82f6;
}

.qa-strip {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  padding: 10px 12px;
  border-radius: var(--radius-sm);
  background: var(--accent-emerald-bg);
  border: 1px solid #a7f3d0;
  color: #065f46;
  font-size: 0.78rem;
  font-weight: 600;
}

/* Sections */
.section {
  padding: 80px 0;
}

.section-alt {
  background: #ffffff;
  border-top: 1px solid var(--border-subtle);
  border-bottom: 1px solid var(--border-subtle);
}

.section-head {
  text-align: center;
  max-width: 720px;
  margin: 0 auto 52px;
}

.section-tag {
  font-size: 0.8rem;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.08em;
  color: var(--brand-primary);
  margin-bottom: 10px;
}

.section-head h2 {
  font-size: 2.1rem;
  letter-spacing: -0.025em;
  margin-bottom: 14px;
}

.section-head p {
  color: var(--text-secondary);
  font-size: 1.02rem;
}

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

.grid-2 {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 24px;
}

.feature-card {
  background: var(--bg-surface);
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-md);
  padding: 28px;
  box-shadow: var(--shadow-sm);
  transition: transform 0.18s ease, box-shadow 0.18s ease;
}

.feature-card:hover {
  transform: translateY(-3px);
  box-shadow: var(--shadow-md);
}

.feature-icon {
  width: 42px;
  height: 42px;
  border-radius: 10px;
  background: var(--brand-light);
  color: var(--brand-primary);
  display: flex;
  align-items: center;
  justify-content: center;
  font-weight: 700;
  margin-bottom: 18px;
  font-family: var(--font-mono);
}

.feature-card h3 {
  font-size: 1.12rem;
  margin-bottom: 10px;
}

.feature-card p {
  font-size: 0.92rem;
  color: var(--text-secondary);
}

/* Architecture Pipeline */
.arch-box {
  background: var(--bg-dark);
  color: #f8fafc;
  border-radius: var(--radius-lg);
  padding: 40px;
  box-shadow: var(--shadow-lg);
}

.arch-steps {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 18px;
  margin-top: 28px;
}

.arch-step {
  background: var(--bg-dark-card);
  border: 1px solid #1e293b;
  border-radius: var(--radius-md);
  padding: 20px;
}

.arch-step .step-num {
  font-family: var(--font-mono);
  font-size: 0.76rem;
  color: #60a5fa;
  margin-bottom: 8px;
}

.arch-step h4 {
  font-size: 0.98rem;
  margin-bottom: 8px;
  color: #fff;
}

.arch-step p {
  font-size: 0.84rem;
  color: #94a3b8;
}

/* Pricing */
.price-card {
  background: var(--bg-surface);
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-lg);
  padding: 32px;
  display: flex;
  flex-direction: column;
  justify-content: space-between;
}

.price-card.popular {
  border: 2px solid var(--brand-primary);
  box-shadow: var(--shadow-md);
  position: relative;
}

.popular-ribbon {
  position: absolute;
  top: -12px;
  right: 24px;
  background: var(--brand-primary);
  color: #fff;
  font-size: 0.74rem;
  font-weight: 700;
  padding: 3px 12px;
  border-radius: 999px;
}

.price-amount {
  font-size: 2.4rem;
  font-weight: 800;
  letter-spacing: -0.03em;
  margin: 14px 0 6px;
}

.price-amount span {
  font-size: 0.95rem;
  font-weight: 500;
  color: var(--text-muted);
}

.price-list {
  list-style: none;
  margin: 22px 0 28px;
  font-size: 0.9rem;
  color: var(--text-secondary);
}

.price-list li {
  margin-bottom: 10px;
  display: flex;
  gap: 8px;
}

.price-list li::before {
  content: "✓";
  color: var(--accent-emerald);
  font-weight: 800;
}

/* Studio App Page */
.studio-layout {
  display: grid;
  grid-template-columns: 300px 1fr;
  gap: 24px;
  padding: 28px 0 64px;
}

.studio-sidebar {
  background: var(--bg-surface);
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-md);
  padding: 20px;
  height: fit-content;
}

.studio-main {
  background: var(--bg-surface);
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-md);
  padding: 24px;
}

.form-group {
  margin-bottom: 16px;
}

.form-group label {
  display: block;
  font-size: 0.82rem;
  font-weight: 600;
  color: var(--text-secondary);
  margin-bottom: 6px;
}

.form-control {
  width: 100%;
  padding: 9px 12px;
  border-radius: var(--radius-sm);
  border: 1px solid var(--border-strong);
  font-family: inherit;
  font-size: 0.9rem;
  background: #fff;
}

textarea.form-control {
  min-height: 135px;
  resize: vertical;
  line-height: 1.55;
}

.glossary-chip {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: 6px 10px;
  background: var(--bg-subtle);
  border: 1px solid var(--border-subtle);
  border-radius: 6px;
  font-size: 0.8rem;
  margin-bottom: 6px;
}

/* Footer */
.footer {
  background: var(--bg-dark);
  color: #94a3b8;
  padding: 56px 0 36px;
  font-size: 0.9rem;
}

.footer-grid {
  display: grid;
  grid-template-columns: 1.6fr 1fr 1fr 1fr;
  gap: 32px;
  padding-bottom: 36px;
  border-bottom: 1px solid #1e293b;
}

.footer h4 {
  color: #fff;
  font-size: 0.92rem;
  margin-bottom: 14px;
}

.footer ul {
  list-style: none;
}

.footer ul li {
  margin-bottom: 9px;
}

.footer ul li a:hover {
  color: #fff;
}

.footer-bottom {
  padding-top: 24px;
  display: flex;
  justify-content: space-between;
  flex-wrap: wrap;
  gap: 12px;
  font-size: 0.82rem;
}

/* Legal / About Prose */
.prose-wrap {
  max-width: 820px;
  margin: 0 auto;
  padding: 56px 24px 80px;
}

.prose-card {
  background: #fff;
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-lg);
  padding: 44px;
  box-shadow: var(--shadow-sm);
}

.prose-card h1 {
  font-size: 2rem;
  margin-bottom: 10px;
}

.prose-card h2 {
  font-size: 1.25rem;
  margin: 28px 0 10px;
}

.prose-card p, .prose-card li {
  color: var(--text-secondary);
  margin-bottom: 12px;
}

.prose-card ul {
  padding-left: 20px;
}

@media (max-width: 960px) {
  .hero-grid, .grid-3, .grid-2, .arch-steps, .studio-layout, .footer-grid {
    grid-template-columns: 1fr;
  }
  .hero h1 {
    font-size: 2.2rem;
  }
  .nav-links {
    display: none;
  }
}

/* Language Switcher & Download Box */
.lang-switch {
  display: inline-flex;
  background: var(--bg-subtle);
  border: 1px solid var(--border-subtle);
  border-radius: 8px;
  padding: 2px;
  gap: 2px;
}

.lang-btn {
  border: none;
  background: transparent;
  padding: 5px 9px;
  border-radius: 6px;
  font-size: 0.78rem;
  font-weight: 600;
  color: var(--text-secondary);
  cursor: pointer;
  transition: all 0.15s ease;
}

.lang-btn:hover {
  color: var(--text-primary);
}

.lang-btn.active {
  background: #ffffff;
  color: var(--brand-primary);
  box-shadow: 0 1px 3px rgba(15, 23, 42, 0.08);
}

.download-panel {
  background: linear-gradient(135deg, #0f172a 0%, #1e293b 100%);
  color: #f8fafc;
  border-radius: var(--radius-lg);
  padding: 44px;
  box-shadow: var(--shadow-lg);
  display: grid;
  grid-template-columns: 1.25fr 0.95fr;
  gap: 36px;
  align-items: center;
}

.hash-box {
  background: rgba(15, 23, 42, 0.65);
  border: 1px solid #334155;
  border-radius: var(--radius-md);
  padding: 18px;
  font-family: var(--font-mono);
  font-size: 0.76rem;
  color: #cbd5e1;
  word-break: break-all;
}

.modal-backdrop {
  position: fixed;
  inset: 0;
  background: rgba(15, 23, 42, 0.55);
  backdrop-filter: blur(4px);
  display: none;
  align-items: center;
  justify-content: center;
  z-index: 999;
  padding: 20px;
}

.modal-backdrop.open {
  display: flex;
}

.modal-card {
  background: #fff;
  border-radius: var(--radius-lg);
  max-width: 580px;
  width: 100%;
  padding: 28px;
  box-shadow: var(--shadow-lg);
  border: 1px solid var(--border-subtle);
}

@media (max-width: 960px) {
  .download-panel {
    grid-template-columns: 1fr;
    padding: 28px;
  }
}