/* ═══════════════════════════════════════════════════════════════
   STP Market Pulse — Design System
   Light theme default, dark theme via [data-theme="dark"]
   ═══════════════════════════════════════════════════════════════ */

:root {
  /* Primary colors */
  --color-primary: #0866FF;
  --color-primary-hover: #0550CC;
  --color-primary-light: #E8F0FE;
  --color-dark-blue: #102A56;

  /* Backgrounds */
  --bg-primary: #FFFFFF;
  --bg-secondary: #F5F9FF;
  --bg-tertiary: #EDF2F7;
  --bg-card: #FFFFFF;
  --bg-code: #101827;

  /* Text — WCAG AA compliant on #FFFFFF backgrounds */
  --text-primary: #111827;    /* 15.4:1 on white */
  --text-secondary: #374151;  /* 10.1:1 on white */
  --text-tertiary: #4B5563;   /* 7.5:1 on white (was #8492A6 at 3.5:1) */
  --text-inverse: #FFFFFF;
  --text-link: #0866FF;

  /* Borders */
  --border-color: #DFE7F1;
  --border-light: #EDF2F7;
  --border-focus: #0866FF;

  /* Status */
  --color-success: #00A86B;
  --color-success-bg: #E6F9F1;
  --color-danger: #E53935;
  --color-danger-bg: #FDE8E8;
  --color-warning: #F59E0B;
  --color-warning-bg: #FEF3C7;
  --color-buy: #00A86B;
  --color-sell: #E53935;

  /* Shadows */
  --shadow-sm: 0 1px 3px rgba(0,0,0,0.06);
  --shadow-md: 0 4px 12px rgba(0,0,0,0.08);
  --shadow-lg: 0 8px 30px rgba(0,0,0,0.10);
  --shadow-card: 0 2px 8px rgba(0,0,0,0.06);

  /* Spacing */
  --space-xs: 4px;
  --space-sm: 8px;
  --space-md: 16px;
  --space-lg: 24px;
  --space-xl: 32px;
  --space-2xl: 48px;
  --space-3xl: 64px;

  /* Radius */
  --radius-sm: 4px;
  --radius-md: 8px;
  --radius-lg: 12px;
  --radius-xl: 16px;
  --radius-pill: 100px;

  /* Typography */
  --font-sans: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;
  --font-mono: 'Fira Code', 'Consolas', 'Monaco', monospace;
  --font-size-xs: 11px;
  --font-size-sm: 13px;
  --font-size-base: 15px;
  --font-size-md: 16px;
  --font-size-lg: 18px;
  --font-size-xl: 22px;
  --font-size-2xl: 28px;
  --font-size-3xl: 36px;
  --font-size-4xl: 48px;

  /* Layout */
  --max-width: 1200px;
  --nav-height: 64px;
}

/* ── Dark Navy theme ──────────────────────────────────────────── */
/* Used by Script Studio (data-theme="dark" on body)              */
[data-theme="dark"] {
  --bg-primary: #101827;
  --bg-secondary: #1E293B;
  --bg-tertiary: #263449;
  --bg-card: #1E293B;
  --bg-code: #0F172A;

  --text-primary: #F8FAFC;
  --text-secondary: #E2E8F0;
  --text-tertiary: #CBD5E1;
  --text-inverse: #101827;
  --text-link: #38BDF8;

  --border-color: #475569;
  --border-light: #334155;
  --border-focus: #38BDF8;

  --shadow-sm: 0 1px 3px rgba(0,0,0,0.4);
  --shadow-md: 0 4px 12px rgba(0,0,0,0.5);
  --shadow-lg: 0 8px 30px rgba(0,0,0,0.6);
  --shadow-card: 0 2px 8px rgba(0,0,0,0.4);

  --color-primary: #2563EB;
  --color-primary-hover: #1D4ED8;
  --color-primary-light: #1E3A5F;

  --color-success: #22C55E;
  --color-success-bg: #14532D;
  --color-danger: #EF4444;
  --color-danger-bg: #7F1D1D;
  --color-warning: #FDE68A;
  --color-warning-bg: #78350F;
  --color-buy: #22C55E;
  --color-sell: #EF4444;
}

/* ── Reset & base ─────────────────────────────────────────────── */
*, *::before, *::after { margin: 0; padding: 0; box-sizing: border-box; }
html { scroll-behavior: smooth; }
body {
  font-family: var(--font-sans);
  font-size: var(--font-size-base);
  line-height: 1.6;
  color: var(--text-primary);
  background: var(--bg-primary);
  -webkit-font-smoothing: antialiased;
}
a { color: var(--text-link); text-decoration: none; transition: color 0.2s; }
a:hover { text-decoration: underline; }
img { max-width: 100%; height: auto; display: block; }
button { cursor: pointer; font-family: inherit; }

/* ── Navigation ───────────────────────────────────────────────── */
.stp-nav {
  position: sticky; top: 0; z-index: 100;
  background: var(--bg-primary);
  border-bottom: 1px solid var(--border-color);
  height: var(--nav-height);
}
.stp-nav-inner {
  max-width: var(--max-width);
  margin: 0 auto;
  padding: 0 var(--space-lg);
  height: 100%;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: var(--space-lg);
}
.stp-nav-logo {
  font-size: 20px;
  font-weight: 900;
  color: var(--color-dark-blue);
  text-decoration: none;
  display: flex;
  align-items: center;
  gap: var(--space-sm);
  white-space: nowrap;
}
.stp-nav-logo .logo-stp { color: var(--color-primary); }
.stp-nav-logo .logo-pulse { font-weight: 600; }
[data-theme="dark"] .stp-nav-logo { color: #e2e8f0; }
[data-theme="dark"] .stp-nav-logo .logo-stp { color: #4ade80; }

.stp-nav-links {
  display: flex;
  align-items: center;
  gap: var(--space-lg);
  font-size: var(--font-size-sm);
  font-weight: 600;
}
.stp-nav-links a {
  color: var(--text-secondary);
  text-decoration: none;
  padding: var(--space-xs) 0;
  transition: color 0.2s;
}
.stp-nav-links a:hover { color: var(--text-primary); text-decoration: none; }
.stp-nav-links a.active { color: var(--color-primary); }

.stp-nav-actions {
  display: flex;
  align-items: center;
  gap: var(--space-md);
}

/* ── Buttons ──────────────────────────────────────────────────── */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: var(--space-sm);
  padding: 10px 24px;
  border-radius: var(--radius-md);
  font-size: var(--font-size-sm);
  font-weight: 700;
  border: none;
  transition: all 0.2s;
  text-decoration: none;
  white-space: nowrap;
}
.btn:hover { text-decoration: none; transform: translateY(-1px); }

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

.btn-secondary {
  background: transparent;
  color: var(--color-primary);
  border: 2px solid var(--color-primary);
}
.btn-secondary:hover { background: var(--color-primary-light); }

.btn-outline {
  background: transparent;
  color: var(--text-primary);
  border: 1px solid var(--border-color);
}
.btn-outline:hover { border-color: var(--color-primary); color: var(--color-primary); }

.btn-lg {
  padding: 14px 36px;
  font-size: var(--font-size-md);
  border-radius: var(--radius-lg);
}
.btn-sm { padding: 6px 14px; font-size: var(--font-size-xs); }

.btn-login {
  background: transparent;
  color: var(--text-primary);
  border: 1px solid var(--border-color);
  padding: 8px 20px;
}
.btn-login:hover { border-color: var(--color-primary); color: var(--color-primary); }

/* ── Cards ────────────────────────────────────────────────────── */
.card {
  background: var(--bg-card);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-lg);
  padding: var(--space-lg);
  box-shadow: var(--shadow-card);
  transition: all 0.2s;
}
.card:hover { box-shadow: var(--shadow-md); }

/* ── Section layout ───────────────────────────────────────────── */
.section {
  padding: var(--space-3xl) var(--space-lg);
}
.section-alt { background: var(--bg-secondary); }
.section-inner {
  max-width: var(--max-width);
  margin: 0 auto;
}
.section-header {
  text-align: center;
  margin-bottom: var(--space-2xl);
}
.section-label {
  font-size: var(--font-size-xs);
  font-weight: 800;
  text-transform: uppercase;
  letter-spacing: 2px;
  color: var(--color-primary);
  margin-bottom: var(--space-sm);
}
.section-title {
  font-size: var(--font-size-3xl);
  font-weight: 900;
  color: var(--text-primary);
  margin-bottom: var(--space-sm);
  line-height: 1.2;
}
.section-subtitle {
  font-size: var(--font-size-md);
  color: var(--text-secondary);
  max-width: 640px;
  margin: 0 auto;
  line-height: 1.6;
}

/* ── Footer ───────────────────────────────────────────────────── */
.stp-footer {
  border-top: 1px solid var(--border-color);
  padding: var(--space-2xl) var(--space-lg);
  background: var(--bg-secondary);
}
.stp-footer-inner {
  max-width: var(--max-width);
  margin: 0 auto;
}
.stp-footer-grid {
  display: grid;
  grid-template-columns: 2fr 1fr 1fr 1fr;
  gap: var(--space-2xl);
  margin-bottom: var(--space-xl);
}
.stp-footer-brand {
  font-size: var(--font-size-sm);
  color: var(--text-secondary);
  line-height: 1.7;
}
.stp-footer-col h4 {
  font-size: var(--font-size-sm);
  font-weight: 700;
  color: var(--text-primary);
  margin-bottom: var(--space-md);
}
.stp-footer-col a {
  display: block;
  font-size: var(--font-size-sm);
  color: var(--text-secondary);
  margin-bottom: var(--space-sm);
  text-decoration: none;
}
.stp-footer-col a:hover { color: var(--color-primary); text-decoration: none; }
.stp-footer-bottom {
  border-top: 1px solid var(--border-color);
  padding-top: var(--space-lg);
  font-size: var(--font-size-xs);
  color: var(--text-tertiary);
  line-height: 1.8;
}
.stp-footer-bottom p { margin-bottom: var(--space-sm); }

/* ── Theme toggle ─────────────────────────────────────────────── */
.theme-toggle {
  background: transparent;
  border: 1px solid var(--border-color);
  border-radius: var(--radius-pill);
  width: 36px; height: 36px;
  display: flex; align-items: center; justify-content: center;
  font-size: 16px;
  color: var(--text-secondary);
  cursor: pointer;
  transition: all 0.2s;
}
.theme-toggle:hover { border-color: var(--color-primary); color: var(--color-primary); }

/* ── Mobile nav ───────────────────────────────────────────────── */
.nav-hamburger {
  display: none;
  background: none;
  border: none;
  color: var(--text-primary);
  font-size: 24px;
  cursor: pointer;
  padding: var(--space-xs);
}

/* ── Check list (pricing features) ────────────────────────────── */
.check-list { list-style: none; }
.check-list li {
  padding: 8px 0;
  font-size: var(--font-size-sm);
  color: var(--text-primary);
  display: flex;
  align-items: flex-start;
  gap: var(--space-sm);
}
.check-list li::before {
  content: '\2713';
  color: var(--color-success);
  font-weight: 800;
  flex-shrink: 0;
}

/* ── Responsive ───────────────────────────────────────────────── */
@media (max-width: 1024px) {
  .stp-footer-grid { grid-template-columns: 1fr 1fr; }
}

@media (max-width: 768px) {
  .nav-hamburger { display: block; }
  .stp-nav-links {
    display: none;
    position: absolute;
    top: var(--nav-height);
    left: 0; right: 0;
    background: var(--bg-primary);
    border-bottom: 1px solid var(--border-color);
    flex-direction: column;
    padding: var(--space-md) var(--space-lg);
    gap: var(--space-md);
    box-shadow: var(--shadow-md);
  }
  .stp-nav-links.open { display: flex; }
  .stp-nav-actions .btn-login { display: none; }

  .section { padding: var(--space-2xl) var(--space-md); }
  .section-title { font-size: var(--font-size-2xl); }
  .stp-footer-grid { grid-template-columns: 1fr; gap: var(--space-lg); }
}

@media (max-width: 480px) {
  .section-title { font-size: var(--font-size-xl); }
  .btn-lg { padding: 12px 24px; font-size: var(--font-size-sm); }
}

/* ── Utility ──────────────────────────────────────────────────── */
.text-center { text-align: center; }
.text-success { color: var(--color-success); }
.text-danger { color: var(--color-danger); }
.text-muted { color: var(--text-secondary); }
.font-mono { font-family: var(--font-mono); }
.sr-only { position: absolute; width: 1px; height: 1px; padding: 0; margin: -1px; overflow: hidden; clip: rect(0,0,0,0); border: 0; }