/* ===== VARIABLES ===== */
:root {
  --color-bg: #ffffff;
  --color-surface: #fafafa;
  --color-border: #f0f0f0;
  --color-border-mid: #e4e4e4;
  --color-text: #0f172a;
  --color-text-secondary: #71717a;
  --color-text-muted: #a1a1aa;
  --color-blue: #2563eb;
  --color-blue-dark: #1d4ed8;
  --color-blue-light: #eff6ff;
  --color-blue-border: #bfdbfe;
  --color-amber: #f59e0b;
  --color-amber-dark: #d97706;
  --color-amber-light: #fffbeb;
  --color-amber-border: #fde68a;
  --color-green: #16a34a;
  --color-green-light: #f0fdf4;
  --color-green-border: #bbf7d0;
  --color-red: #dc2626;
  --color-red-light: #fef2f2;
  --color-red-border: #fecaca;
  --color-nav-bg: #ffffff;
  --color-nav-text: #0f172a;
  --color-nav-muted: #94a3b8;
  --font-sans: 'DM Sans', -apple-system, BlinkMacSystemFont, sans-serif;
  --font-mono: 'DM Mono', 'Courier New', monospace;
  --radius-sm: 6px;
  --radius-md: 10px;
  --radius-lg: 14px;
  --shadow-sm: 0 1px 3px rgba(0,0,0,0.08), 0 1px 2px rgba(0,0,0,0.04);
  --shadow-md: 0 4px 12px rgba(0,0,0,0.08), 0 2px 4px rgba(0,0,0,0.04);
}

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

/* ===== BASE ===== */
body {
  font-family: var(--font-sans);
  font-size: 16px;
  color: var(--color-text);
  background: var(--color-bg);
  line-height: 1.6;
  -webkit-font-smoothing: antialiased;
  min-height: 100vh;
}

/* ===== NAV ===== */
.nav {
  background: var(--color-nav-bg);
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 56px;
  padding: 0 24px;
  border-bottom: 1px solid #f0f0f0;
  position: sticky;
  top: 0;
  z-index: 100;
}

@media (max-width: 640px) {
  .nav {
    padding: 0 16px;
    height: 52px;
  }
}

.logo {
  font-size: 17px;
  font-weight: 600;
  letter-spacing: -0.4px;
  color: #0f172a;
  text-decoration: none;
}

.logo span {
  color: #2563eb;
}

.logo:hover {
  opacity: 0.85;
}

.nav-link {
  font-size: 13px;
  color: #64748b;
  text-decoration: none;
  font-weight: 500;
  transition: color 0.15s;
}

.nav-link:hover {
  color: #0f172a;
}

.nav-hint {
  font-size: 13px;
  color: #94a3b8;
}

.nav-right {
  display: flex;
  align-items: center;
  gap: 20px;
}

/* ===== CARDS ===== */
.card {
  background: var(--color-bg);
  border: 1px solid var(--color-border-mid);
  border-radius: var(--radius-lg);
  padding: 24px;
  box-shadow: var(--shadow-sm);
}

.card--blue {
  border-top: 2px solid var(--color-blue);
}

.card--amber {
  border-top: 2px solid var(--color-amber);
}

.card--surface {
  background: var(--color-surface);
}

/* ===== BUTTONS ===== */
.btn-primary {
  display: inline-block;
  background: var(--color-blue);
  color: #ffffff;
  border: none;
  border-radius: var(--radius-md);
  padding: 13px 20px;
  font-size: 15px;
  font-weight: 600;
  font-family: var(--font-sans);
  cursor: pointer;
  transition: background 0.15s;
  text-decoration: none;
  text-align: center;
}

.btn-primary:hover {
  background: var(--color-blue-dark);
}

.btn-primary:disabled {
  opacity: 0.5;
  cursor: not-allowed;
}

.btn-secondary {
  display: inline-block;
  background: #ffffff;
  color: var(--color-text);
  border: 1px solid var(--color-border-mid);
  border-radius: var(--radius-md);
  padding: 13px 20px;
  font-size: 15px;
  font-weight: 600;
  font-family: var(--font-sans);
  cursor: pointer;
  transition: border-color 0.15s, color 0.15s;
  text-decoration: none;
  text-align: center;
}

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

.btn--full {
  width: 100%;
  display: block;
}

/* ===== INPUTS ===== */
.input {
  width: 100%;
  padding: 11px 14px;
  border: 1px solid var(--color-border-mid);
  border-radius: var(--radius-sm);
  font-size: 15px;
  font-family: var(--font-sans);
  color: var(--color-text);
  background: var(--color-bg);
  outline: none;
  transition: border-color 0.15s;
}

.input:focus {
  border-color: var(--color-blue);
}

/* ===== LABELS ===== */
.label {
  font-size: 11px;
  font-weight: 600;
  color: var(--color-text-secondary);
  text-transform: uppercase;
  letter-spacing: 0.8px;
  display: block;
  margin-bottom: 6px;
}

/* ===== SECTION HEADING ===== */
.section-head {
  font-size: 16px;
  font-weight: 700;
  color: var(--color-text-primary);
  margin: 28px 0 12px;
  display: flex;
  align-items: center;
  gap: 10px;
}

.section-head::after {
  content: '';
  flex: 1;
  height: 1px;
  background: var(--color-border);
}

/* ===== MONO DISPLAY ===== */
.mono-display {
  font-family: var(--font-mono);
  letter-spacing: -0.5px;
}

/* ===== PILLS ===== */
.pill {
  display: inline-flex;
  align-items: center;
  gap: 5px;
  padding: 3px 10px;
  border-radius: 20px;
  font-size: 12px;
  font-weight: 500;
}

.pill--blue {
  background: var(--color-blue-light);
  color: var(--color-blue);
  border: 1px solid var(--color-blue-border);
}

.pill--amber {
  background: var(--color-amber-light);
  color: var(--color-amber-dark);
  border: 1px solid var(--color-amber-border);
}

.pill--green {
  background: var(--color-green-light);
  color: var(--color-green);
  border: 1px solid var(--color-green-border);
}

.pill--grey {
  background: var(--color-surface);
  color: var(--color-text-muted);
  border: 1px solid var(--color-border-mid);
}

/* ===== ALERTS ===== */
.alert {
  border-radius: var(--radius-md);
  padding: 14px 16px;
  font-size: 14px;
  line-height: 1.5;
  margin-bottom: 14px;
}

.alert--blue {
  background: var(--color-blue-light);
  border: 1px solid var(--color-blue-border);
  color: #1e40af;
}

.alert--amber {
  background: var(--color-amber-light);
  border: 1px solid var(--color-amber-border);
  color: #92400e;
}

.alert--green {
  background: var(--color-green-light);
  border: 1px solid var(--color-green-border);
  color: #15803d;
}

.alert--red {
  background: var(--color-red-light);
  border: 1px solid var(--color-red-border);
  color: var(--color-red);
}

/* ===== FOOTER ===== */
.footer {
  padding: 20px 24px;
  border-top: 1px solid var(--color-border);
  font-size: 12px;
  color: var(--color-text-muted);
  text-align: center;
  line-height: 1.7;
}

.footer a {
  color: var(--color-text-muted);
  text-decoration: none;
}

/* ===== HERO ===== */
.hero {
  background: #f8fafc;
  color: #0f172a;
}

/* ===== PAGE WRAPPERS ===== */
.page {
  max-width: 520px;
  margin: 0 auto;
  padding: 40px 20px 80px;
}

@media (max-width: 640px) {
  .page {
    padding: 28px 16px 60px;
  }
}

.page--wide {
  max-width: 680px;
  margin: 0 auto;
  padding: 40px 24px 80px;
}

/* ===== HOME PAGE SECTIONS ===== */
.proof {
  padding: 40px 24px;
}

.press {
  padding: 32px 24px 40px;
}

.example-section {
  padding: 40px 24px 64px;
}