/* ─── Variables ──────────────────────────────────────────────────────────── */

:root {
  --color-primary: #2563eb;
  --color-primary-hover: #1d4ed8;
  --color-primary-light: #dbeafe;
  --color-primary-dark: #1e40af;
  --color-bg: #ffffff;
  --color-bg-secondary: #f8fafc;
  --color-bg-tertiary: #f1f5f9;
  --color-surface: #ffffff;
  --color-border: #e2e8f0;
  --color-border-strong: #cbd5e1;
  --color-text: #0f172a;
  --color-text-secondary: #475569;
  --color-text-tertiary: #94a3b8;
  --color-text-inverse: #ffffff;
  --color-success: #16a34a;
  --radius-sm: 6px;
  --radius-md: 8px;
  --radius-lg: 12px;
  --radius-xl: 16px;
  --shadow-sm: 0 1px 2px 0 rgb(0 0 0 / 0.05);
  --shadow-md: 0 4px 6px -1px rgb(0 0 0 / 0.1), 0 2px 4px -2px rgb(0 0 0 / 0.1);
  --shadow-lg: 0 10px 15px -3px rgb(0 0 0 / 0.1), 0 4px 6px -4px rgb(0 0 0 / 0.1);
  --font-sans: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
  --font-mono: 'Fira Code', 'Cascadia Code', Consolas, monospace;
}

@media (prefers-color-scheme: dark) {
  :root {
    --color-bg: #0f172a;
    --color-bg-secondary: #1e293b;
    --color-bg-tertiary: #334155;
    --color-surface: #1e293b;
    --color-border: #334155;
    --color-border-strong: #475569;
    --color-text: #f1f5f9;
    --color-text-secondary: #94a3b8;
    --color-text-tertiary: #64748b;
    --color-primary-light: #1e3a5f;
  }
}

/* ─── Reset ──────────────────────────────────────────────────────────────── */

*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }
html { scroll-behavior: smooth; }
body {
  font-family: var(--font-sans);
  color: var(--color-text);
  background: var(--color-bg);
  line-height: 1.6;
  -webkit-font-smoothing: antialiased;
}
a { color: inherit; text-decoration: none; }
img, svg { display: block; max-width: 100%; }

/* ─── Layout ─────────────────────────────────────────────────────────────── */

.container { max-width: 1200px; margin: 0 auto; padding: 0 24px; }
.section { padding: 96px 0; }
.section-alt { background: var(--color-bg-secondary); }
.section-header { text-align: center; max-width: 640px; margin: 0 auto 56px; }
.section-header h2 { font-size: 2.25rem; margin-bottom: 12px; }
.section-header p { font-size: 1.125rem; color: var(--color-text-secondary); }

/* ─── Navigation ─────────────────────────────────────────────────────────── */

.site-header {
  position: sticky;
  top: 0;
  z-index: 100;
  background: rgba(255, 255, 255, 0.85);
  backdrop-filter: blur(12px);
  border-bottom: 1px solid var(--color-border);
}
@media (prefers-color-scheme: dark) {
  .site-header { background: rgba(15, 23, 42, 0.85); }
}
.nav-bar {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 64px;
}
.logo {
  display: flex;
  align-items: center;
  gap: 10px;
  font-weight: 700;
  font-size: 1.25rem;
}
.nav-links {
  display: flex;
  align-items: center;
  gap: 32px;
}
.nav-links a {
  font-size: 0.9375rem;
  color: var(--color-text-secondary);
  transition: color 0.15s;
}
.nav-links a:hover { color: var(--color-text); }
.nav-actions { display: flex; align-items: center; gap: 12px; }
.mobile-toggle { display: none; background: none; border: none; cursor: pointer; color: var(--color-text); }

@media (max-width: 768px) {
  .nav-links, .nav-actions { display: none; flex-direction: column; position: absolute; top: 64px; left: 0; right: 0; background: var(--color-bg); border-bottom: 1px solid var(--color-border); padding: 16px 24px; gap: 12px; }
  .nav-links.open, .nav-actions.open { display: flex; }
  .mobile-toggle { display: block; }
}

/* ─── Buttons ────────────────────────────────────────────────────────────── */

.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  font-family: inherit;
  font-size: 0.9375rem;
  font-weight: 500;
  padding: 10px 20px;
  border: 1px solid transparent;
  border-radius: var(--radius-md);
  cursor: pointer;
  transition: all 0.15s ease;
  line-height: 1;
  white-space: nowrap;
}
.btn-primary { background: var(--color-primary); color: var(--color-text-inverse); }
.btn-primary:hover { background: var(--color-primary-hover); }
.btn-secondary { background: var(--color-bg); color: var(--color-text); border-color: var(--color-border); }
.btn-secondary:hover { background: var(--color-bg-secondary); }
.btn-ghost { background: transparent; color: var(--color-text-secondary); }
.btn-ghost:hover { background: var(--color-bg-tertiary); color: var(--color-text); }
.btn-lg { font-size: 1.0625rem; padding: 14px 28px; }
.btn-white { background: white; color: var(--color-primary-dark); border-color: white; }
.btn-white:hover { background: #f0f4ff; }
.btn-outline-white { background: transparent; color: white; border-color: rgba(255,255,255,0.4); }
.btn-outline-white:hover { background: rgba(255,255,255,0.1); border-color: rgba(255,255,255,0.7); }
.btn-sm { font-size: 0.8125rem; padding: 6px 12px; }

/* ─── Hero ────────────────────────────────────────────────────────────────── */

.hero {
  padding: 80px 0 64px;
  text-align: center;
  background: linear-gradient(180deg, var(--color-primary-light) 0%, var(--color-bg) 100%);
}
.hero-badge {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  padding: 6px 16px;
  border-radius: 9999px;
  background: var(--color-bg);
  border: 1px solid var(--color-border);
  font-size: 0.8125rem;
  font-weight: 500;
  color: var(--color-text-secondary);
  margin-bottom: 24px;
}
.hero h1 {
  font-size: 3.5rem;
  font-weight: 800;
  line-height: 1.1;
  margin-bottom: 20px;
  letter-spacing: -0.02em;
}
.hero-sub {
  font-size: 1.25rem;
  color: var(--color-text-secondary);
  max-width: 680px;
  margin: 0 auto 40px;
  line-height: 1.7;
}
.hero-ctas {
  display: flex;
  gap: 16px;
  justify-content: center;
  flex-wrap: wrap;
  margin-bottom: 56px;
}
.hero-stats {
  display: flex;
  justify-content: center;
  gap: 48px;
  flex-wrap: wrap;
}
.stat {
  display: flex;
  flex-direction: column;
  align-items: center;
}
.stat-value {
  font-size: 1.5rem;
  font-weight: 700;
  color: var(--color-primary);
  font-family: var(--font-mono);
}
.stat-label {
  font-size: 0.8125rem;
  color: var(--color-text-tertiary);
  margin-top: 4px;
}

@media (max-width: 768px) {
  .hero h1 { font-size: 2.25rem; }
  .hero-sub { font-size: 1.0625rem; }
  .hero-stats { gap: 24px; }
}

/* ─── Steps ──────────────────────────────────────────────────────────────── */

.steps {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 40px;
  position: relative;
}
.steps::before {
  content: '';
  position: absolute;
  top: 40px;
  left: 16.66%;
  right: 16.66%;
  height: 2px;
  background: var(--color-border);
}
.step {
  text-align: center;
  position: relative;
}
.step-number {
  width: 32px;
  height: 32px;
  border-radius: 50%;
  background: var(--color-primary);
  color: white;
  font-weight: 700;
  font-size: 0.875rem;
  display: flex;
  align-items: center;
  justify-content: center;
  margin: 0 auto 20px;
  position: relative;
  z-index: 1;
}
.step-icon {
  width: 64px;
  height: 64px;
  border-radius: var(--radius-lg);
  background: var(--color-primary-light);
  color: var(--color-primary);
  display: flex;
  align-items: center;
  justify-content: center;
  margin: 0 auto 16px;
}
.step h3 { font-size: 1.25rem; margin-bottom: 8px; }
.step p { font-size: 0.9375rem; color: var(--color-text-secondary); }

@media (max-width: 768px) {
  .steps { grid-template-columns: 1fr; gap: 32px; }
  .steps::before { display: none; }
}

/* ─── Split Layout ───────────────────────────────────────────────────────── */

.split {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 64px;
  align-items: center;
}
.split-reverse .split-content { order: 1; }
.split-reverse .split-visual { order: 0; }
.eyebrow {
  font-size: 0.8125rem;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.05em;
  color: var(--color-primary);
  margin-bottom: 12px;
}
.split-content h2 { font-size: 2rem; margin-bottom: 16px; }
.split-content > p { font-size: 1.0625rem; color: var(--color-text-secondary); margin-bottom: 24px; line-height: 1.7; }
.feature-list { list-style: none; margin-bottom: 32px; }
.feature-list li {
  display: flex;
  align-items: flex-start;
  gap: 12px;
  padding: 8px 0;
  font-size: 0.9375rem;
  color: var(--color-text-secondary);
}
.feature-list li svg { flex-shrink: 0; margin-top: 2px; }
.split-actions { display: flex; gap: 12px; flex-wrap: wrap; }

@media (max-width: 768px) {
  .split { grid-template-columns: 1fr; gap: 40px; }
  .split-reverse .split-content { order: 0; }
  .split-reverse .split-visual { order: 1; }
}

/* ─── Code Block ─────────────────────────────────────────────────────────── */

.code-block {
  background: #1e293b;
  border-radius: var(--radius-lg);
  overflow: hidden;
  box-shadow: var(--shadow-lg);
}
.code-header {
  display: flex;
  align-items: center;
  gap: 8px;
  padding: 12px 16px;
  background: #0f172a;
}
.code-dot { width: 12px; height: 12px; border-radius: 50%; }
.code-title { margin-left: 8px; font-size: 0.8125rem; color: #94a3b8; }
.code-block pre {
  margin: 0;
  padding: 20px;
  background: transparent;
  border: none;
  color: #e2e8f0;
  font-size: 0.8125rem;
  line-height: 1.8;
  overflow-x: auto;
}
.code-block code { font-family: var(--font-mono); }
.kw { color: #7dd3fc; }
.str { color: #86efac; }
.num { color: #fbbf24; }

/* ─── Phone Mockup ───────────────────────────────────────────────────────── */

.phone-mockup {
  width: 320px;
  margin: 0 auto;
  background: var(--color-bg);
  border: 2px solid var(--color-border-strong);
  border-radius: 32px;
  padding: 12px;
  box-shadow: var(--shadow-lg);
}
.phone-screen {
  background: var(--color-bg-secondary);
  border-radius: 22px;
  padding: 16px;
  min-height: 420px;
}
.phone-header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  margin-bottom: 16px;
  padding-bottom: 12px;
  border-bottom: 1px solid var(--color-border);
}
.phone-title { font-weight: 600; font-size: 1.0625rem; }
.task-card-mini {
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  padding: 14px;
  margin-bottom: 10px;
}
.task-card-top {
  display: flex;
  justify-content: space-between;
  align-items: center;
  margin-bottom: 6px;
}
.task-category {
  font-size: 0.6875rem;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.04em;
  color: var(--color-primary);
  background: var(--color-primary-light);
  padding: 2px 8px;
  border-radius: 4px;
}
.task-pay {
  font-weight: 700;
  font-size: 0.9375rem;
  color: var(--color-success);
}
.task-title-mini {
  font-size: 0.875rem;
  font-weight: 500;
  margin-bottom: 6px;
  color: var(--color-text);
}
.task-meta-mini {
  display: flex;
  align-items: center;
  gap: 4px;
  font-size: 0.75rem;
  color: var(--color-text-tertiary);
}

/* ─── Use Cases ──────────────────────────────────────────────────────────── */

.use-cases {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 24px;
}
.use-case {
  text-align: center;
  transition: box-shadow 0.2s, border-color 0.2s;
}
.use-case:hover {
  box-shadow: var(--shadow-md);
  border-color: var(--color-border-strong);
}
.card {
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
  padding: 28px 24px;
}
.use-case-icon {
  width: 56px;
  height: 56px;
  border-radius: var(--radius-md);
  background: var(--color-primary-light);
  color: var(--color-primary);
  display: flex;
  align-items: center;
  justify-content: center;
  margin: 0 auto 16px;
}
.use-case h3 { font-size: 1.0625rem; margin-bottom: 8px; }
.use-case p { font-size: 0.875rem; color: var(--color-text-secondary); line-height: 1.6; }

@media (max-width: 768px) {
  .use-cases { grid-template-columns: 1fr 1fr; }
}
@media (max-width: 480px) {
  .use-cases { grid-template-columns: 1fr; }
}

/* ─── CTA Section ────────────────────────────────────────────────────────── */

.cta-section { padding: 96px 0; background: var(--color-bg); }
.cta-box {
  background: linear-gradient(135deg, #1e40af 0%, #2563eb 50%, #3b82f6 100%);
  border-radius: var(--radius-xl);
  padding: 64px 48px;
  text-align: center;
  color: white;
}
.cta-box h2 { font-size: 2.25rem; margin-bottom: 12px; color: white; }
.cta-box p { font-size: 1.125rem; opacity: 0.85; max-width: 520px; margin: 0 auto 32px; color: white; }
.cta-buttons { display: flex; gap: 16px; justify-content: center; flex-wrap: wrap; }

/* ─── Footer ─────────────────────────────────────────────────────────────── */

.site-footer {
  border-top: 1px solid var(--color-border);
  padding: 56px 0 32px;
}
.footer-grid {
  display: grid;
  grid-template-columns: 2fr 1fr 1fr 1fr;
  gap: 48px;
  margin-bottom: 40px;
}
.footer-brand .logo { margin-bottom: 12px; }
.footer-brand p { font-size: 0.875rem; color: var(--color-text-tertiary); max-width: 280px; line-height: 1.6; }
.footer-col h4 { font-size: 0.8125rem; font-weight: 600; text-transform: uppercase; letter-spacing: 0.05em; color: var(--color-text-tertiary); margin-bottom: 16px; }
.footer-col a {
  display: block;
  font-size: 0.875rem;
  color: var(--color-text-secondary);
  padding: 4px 0;
  transition: color 0.15s;
}
.footer-col a:hover { color: var(--color-primary); }
.footer-bottom {
  padding-top: 24px;
  border-top: 1px solid var(--color-border);
  font-size: 0.8125rem;
  color: var(--color-text-tertiary);
}

@media (max-width: 768px) {
  .footer-grid { grid-template-columns: 1fr 1fr; gap: 32px; }
}
@media (max-width: 480px) {
  .footer-grid { grid-template-columns: 1fr; }
}