/* ─────────────────────────────────────────────────────────────
   EpoxyCalc Shared Stylesheet
   All shared styling for navigation, layout, cards, typography.
   Individual pages add page-specific styles in their <style> block.
   ───────────────────────────────────────────────────────────── */

:root {
  --bg: #0e0e0e;
  --surface: #161616;
  --surface2: #1e1e1e;
  --border: #2a2a2a;
  --border-hover: #444;
  --amber: #f0a500;
  --amber-dim: #b07800;
  --amber-glow: rgba(240, 165, 0, 0.12);
  --teal: #3fb9b5;
  --text: #e8e8e0;
  --text-muted: #7a7a72;
  --text-dim: #444;
  --radius: 6px;
  --radius-lg: 12px;
}

*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }
html { scroll-behavior: smooth; }
body {
  background: var(--bg);
  color: var(--text);
  font-family: 'DM Sans', sans-serif;
  line-height: 1.65;
  font-size: 16px;
  min-height: 100vh;
  display: flex;
  flex-direction: column;
}

a { color: inherit; }

/* ── HEADER (shared across all pages — do NOT override in page styles) ── */
header {
  border-bottom: 1px solid var(--border);
  position: sticky;
  top: 0;
  z-index: 100;
  background: rgba(14, 14, 14, 0.88);
  backdrop-filter: blur(10px);
  -webkit-backdrop-filter: blur(10px);
}
.header-inner {
  max-width: 1100px;
  margin: 0 auto;
  padding: 0 24px;
  height: 64px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 16px;
}
.logo {
  font-family: 'Bebas Neue', sans-serif;
  font-size: 26px;
  letter-spacing: 2px;
  color: var(--amber);
  text-decoration: none;
  display: flex;
  align-items: center;
  gap: 8px;
  flex-shrink: 0;
}
.logo-dot {
  width: 8px;
  height: 8px;
  background: var(--amber);
  border-radius: 50%;
  display: inline-block;
}

.header-right {
  display: flex;
  align-items: center;
  gap: 20px;
}
nav { display: flex; gap: 24px; }
nav a {
  color: var(--text-muted);
  text-decoration: none;
  font-size: 13px;
  letter-spacing: 0.5px;
  text-transform: uppercase;
  font-weight: 500;
  transition: color 0.15s;
}
nav a:hover { color: var(--text); }
nav a.active { color: var(--amber); }

/* ── HAMBURGER (hidden on desktop, visible on mobile) ── */
.nav-toggle {
  display: none;
  background: transparent;
  border: 1px solid var(--border);
  border-radius: var(--radius);
  width: 40px;
  height: 40px;
  padding: 0;
  cursor: pointer;
  color: var(--text);
  align-items: center;
  justify-content: center;
  transition: border-color 0.15s, color 0.15s;
}
.nav-toggle:hover { border-color: var(--amber); color: var(--amber); }
.nav-toggle svg { display: block; }
.nav-toggle .icon-close { display: none; }
.nav-toggle[aria-expanded="true"] .icon-open { display: none; }
.nav-toggle[aria-expanded="true"] .icon-close { display: block; }

/* ── UNIT TOGGLE ── */
.unit-toggle {
  display: flex;
  background: var(--surface2);
  border: 1px solid var(--border);
  border-radius: 100px;
  padding: 3px;
  gap: 2px;
}
.unit-toggle-opt {
  background: transparent;
  border: none;
  cursor: pointer;
  padding: 5px 12px;
  border-radius: 100px;
  font-family: 'DM Mono', monospace;
  font-size: 11px;
  font-weight: 600;
  letter-spacing: 1px;
  color: var(--text-muted);
  transition: all 0.18s;
}
.unit-toggle-opt:hover { color: var(--text); }
.unit-toggle-opt.active {
  background: var(--amber);
  color: #000;
}

/* ── MAIN LAYOUT ── */
main {
  flex: 1;
  max-width: 1100px;
  margin: 0 auto;
  padding: 48px 24px;
  width: 100%;
}

/* ── TYPOGRAPHY ── */
h1.page-title {
  font-family: 'Bebas Neue', sans-serif;
  font-size: clamp(42px, 6vw, 60px);
  letter-spacing: 3px;
  line-height: 1.05;
  margin-bottom: 14px;
}
h1.page-title span { color: var(--amber); }

h2 {
  font-family: 'Bebas Neue', sans-serif;
  font-size: 28px;
  letter-spacing: 2px;
  margin: 40px 0 16px;
  color: var(--text);
}

h3 {
  font-family: 'DM Sans', sans-serif;
  font-size: 18px;
  font-weight: 600;
  margin-bottom: 8px;
  color: var(--text);
}

p { color: var(--text-muted); margin-bottom: 14px; }
p strong { color: var(--text); font-weight: 600; }

.eyebrow {
  font-family: 'DM Mono', monospace;
  font-size: 11px;
  letter-spacing: 3px;
  text-transform: uppercase;
  color: var(--amber);
  margin-bottom: 14px;
}

.subtitle {
  font-size: 17px;
  color: var(--text-muted);
  margin-bottom: 32px;
  max-width: 680px;
}

/* ── HERO SECTION ── */
.hero {
  background: linear-gradient(135deg, #0e0e0e 0%, #141208 100%);
  border-bottom: 1px solid var(--border);
  padding: 64px 24px 56px;
  position: relative;
  overflow: hidden;
}
.hero::before {
  content: '';
  position: absolute;
  top: -80px;
  right: -80px;
  width: 400px;
  height: 400px;
  background: radial-gradient(circle, rgba(240, 165, 0, 0.07) 0%, transparent 70%);
  pointer-events: none;
}
.hero-inner {
  max-width: 800px;
  margin: 0 auto;
  position: relative;
}

/* ── CARDS ── */
.card {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius-lg);
  padding: 28px;
  transition: border-color 0.2s;
}
.card:hover { border-color: var(--border-hover); }

/* ── BUTTONS / CTAs ── */
.btn-primary {
  display: inline-block;
  background: var(--amber);
  color: #000;
  padding: 13px 26px;
  border-radius: var(--radius);
  text-decoration: none;
  font-family: 'Bebas Neue', sans-serif;
  font-size: 18px;
  letter-spacing: 2px;
  transition: all 0.18s;
  border: none;
  cursor: pointer;
}
.btn-primary:hover {
  background: #ffbb20;
  box-shadow: 0 0 20px rgba(240, 165, 0, 0.3);
}

.btn-secondary {
  display: inline-block;
  background: var(--surface2);
  color: var(--text);
  padding: 11px 22px;
  border-radius: var(--radius);
  text-decoration: none;
  font-family: 'DM Sans', sans-serif;
  font-size: 13px;
  font-weight: 600;
  letter-spacing: 1px;
  text-transform: uppercase;
  border: 1px solid var(--border);
  transition: all 0.18s;
}
.btn-secondary:hover {
  border-color: var(--amber);
  color: var(--amber);
}

/* ── FOOTER ── */
footer {
  border-top: 1px solid var(--border);
  padding: 32px 24px;
  margin-top: auto;
}
.footer-inner {
  max-width: 1100px;
  margin: 0 auto;
  display: flex;
  justify-content: space-between;
  align-items: center;
  flex-wrap: wrap;
  gap: 16px;
}
.footer-links { display: flex; gap: 20px; flex-wrap: wrap; }
.footer-links a {
  font-size: 12px;
  color: var(--text-dim);
  text-decoration: none;
  transition: color 0.15s;
}
.footer-links a:hover { color: var(--text-muted); }
.footer-copy { font-size: 12px; color: var(--text-dim); }

/* ── TAGS AND BADGES ── */
.tag {
  display: inline-block;
  background: var(--amber-glow);
  color: var(--amber);
  border: 1px solid rgba(240, 165, 0, 0.25);
  padding: 3px 10px;
  border-radius: 100px;
  font-size: 11px;
  font-family: 'DM Mono', monospace;
  font-weight: 500;
  letter-spacing: 1px;
  text-transform: uppercase;
}
.tag.teal {
  background: rgba(63, 185, 181, 0.1);
  color: var(--teal);
  border-color: rgba(63, 185, 181, 0.25);
}
.tag.muted {
  background: var(--surface2);
  color: var(--text-muted);
  border-color: var(--border);
}

/* ── EMAIL CAPTURE (reusable) ── */
.email-capture {
  background: linear-gradient(135deg, #161610 0%, #1a1608 100%);
  border: 1px solid var(--amber-dim);
  border-radius: var(--radius-lg);
  padding: 32px;
  text-align: center;
  margin: 40px 0;
}
.email-capture h3 {
  font-family: 'Bebas Neue', sans-serif;
  font-size: 26px;
  letter-spacing: 2px;
  margin-bottom: 10px;
}
.email-capture p {
  color: var(--text-muted);
  margin-bottom: 18px;
  max-width: 480px;
  margin-left: auto;
  margin-right: auto;
}
.email-form {
  display: flex;
  gap: 10px;
  max-width: 420px;
  margin: 0 auto;
  flex-wrap: wrap;
}
.email-form input {
  flex: 1;
  min-width: 180px;
  padding: 12px 16px;
  background: var(--surface2);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  color: var(--text);
  font-family: 'DM Sans', sans-serif;
  font-size: 14px;
  outline: none;
  transition: border-color 0.15s;
}
.email-form input:focus { border-color: var(--amber); }
.email-form input::placeholder { color: var(--text-dim); }

/* ── MOBILE ── */
@media (max-width: 760px) {
  .header-inner { padding: 0 16px; gap: 10px; }
  .header-right {
    position: absolute;
    top: 64px;
    left: 0;
    right: 0;
    background: rgba(14, 14, 14, 0.98);
    backdrop-filter: blur(10px);
    -webkit-backdrop-filter: blur(10px);
    border-bottom: 1px solid var(--border);
    flex-direction: column;
    align-items: stretch;
    gap: 0;
    padding: 8px 16px 16px;
    max-height: 0;
    overflow: hidden;
    opacity: 0;
    pointer-events: none;
    transition: max-height 0.28s ease, opacity 0.2s ease, padding 0.28s ease;
  }
  .header-right.is-open {
    max-height: 420px;
    opacity: 1;
    pointer-events: auto;
  }
  nav {
    flex-direction: column;
    gap: 0;
    width: 100%;
  }
  nav a {
    display: block;
    padding: 14px 4px;
    font-size: 14px;
    border-bottom: 1px solid var(--border);
  }
  nav a:last-child { border-bottom: none; }
  .header-right .unit-toggle {
    align-self: flex-start;
    margin-top: 12px;
  }
  .nav-toggle { display: inline-flex; }
  main { padding: 30px 16px; }
  .hero { padding: 48px 20px 40px; }
  h1.page-title { font-size: 36px; }
}

/* Unit toggle flash animation when switching */
.u { transition: color 0.25s ease; }
.u.flash { color: var(--amber); }