/* ============================================================
   SALTY CELLS — Main Stylesheet
   ============================================================

   COLOUR PALETTE — change these 6 variables to rebrand:
   --bg-base      : page background (very dark navy)
   --bg-surface   : card / section background
   --bg-raised    : elevated card / hover state
   --accent-blue  : primary CTA, links, highlights  (#00c8ff → electric cyan)
   --accent-teal  : secondary highlight, badges      (#00e5b0 → mint teal)
   --accent-orange: warnings, hot accents            (#ff6b35 → burnt orange)

   ============================================================ */

/* =====================
   0. CUSTOM PROPERTIES
===================== */
:root {
  /* Backgrounds */
  --bg-base:    #060f1e;
  --bg-surface: #0d1f3c;
  --bg-raised:  #132847;
  --bg-input:   #0a1a30;

  /* Accent colours */
  --accent-blue:   #00c8ff;
  --accent-teal:   #00e5b0;
  --accent-orange: #ff6b35;
  --accent-grad:   linear-gradient(135deg, #00c8ff 0%, #00e5b0 100%);

  /* Text */
  --text-primary:   #ffffff;
  --text-secondary: #8ba3c7;
  --text-muted:     #4a6080;

  /* Borders */
  --border:       #1e3a5f;
  --border-light: #2a4f7a;

  /* Status */
  --success: #22c55e;
  --warning: #f59e0b;
  --error:   #ef4444;

  /* Spacing */
  --space-1: 0.25rem;
  --space-2: 0.5rem;
  --space-3: 0.75rem;
  --space-4: 1rem;
  --space-5: 1.25rem;
  --space-6: 1.5rem;
  --space-8: 2rem;
  --space-10: 2.5rem;
  --space-12: 3rem;
  --space-16: 4rem;
  --space-20: 5rem;
  --space-24: 6rem;

  /* Border radius */
  --radius-sm: 6px;
  --radius:    12px;
  --radius-lg: 20px;
  --radius-xl: 28px;

  /* Shadows */
  --shadow-sm:  0 2px 8px rgba(0,0,0,0.4);
  --shadow:     0 4px 20px rgba(0,0,0,0.5);
  --shadow-lg:  0 8px 40px rgba(0,0,0,0.6);
  --glow-blue:  0 0 24px rgba(0, 200, 255, 0.25);
  --glow-teal:  0 0 24px rgba(0, 229, 176, 0.2);

  /* Typography */
  --font-sans: 'Inter', system-ui, -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;
  --font-display: 'Bevan', Georgia, serif;
  --font-accent: 'Rajdhani', var(--font-sans);

  /* Transitions */
  --transition: 0.2s ease;
  --transition-slow: 0.35s ease;

  /* Layout */
  --max-width: 1200px;
  --nav-height: 72px;
}

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

html {
  scroll-behavior: smooth;
  font-size: 16px;
}

body {
  font-family: var(--font-sans);
  background-color: var(--bg-base);
  color: var(--text-primary);
  line-height: 1.6;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
  overflow-x: hidden;
}

img, svg { display: block; max-width: 100%; }
a { color: var(--accent-blue); text-decoration: none; transition: color var(--transition); }
a:hover { color: var(--accent-teal); }
ul, ol { list-style: none; }
button { cursor: pointer; font-family: inherit; }
input, select, textarea { font-family: inherit; }

/* =====================
   2. TYPOGRAPHY
===================== */
h1, h2, h3, h4, h5 {
  font-family: var(--font-display);
  font-weight: 400;
  line-height: 1.2;
  letter-spacing: 0.02em;
}

h1 { font-size: clamp(2.2rem, 5vw, 3.6rem); }
h2 { font-size: clamp(1.8rem, 3.5vw, 2.6rem); }
h3 { font-size: clamp(1.3rem, 2.5vw, 1.7rem); }
h4 { font-size: 1.2rem; }
h5 { font-size: 1rem; }

p { margin-bottom: var(--space-4); color: var(--text-secondary); line-height: 1.75; }
p:last-child { margin-bottom: 0; }

.text-gradient {
  background: var(--accent-grad);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

.text-accent  { color: var(--accent-blue); }
.text-teal    { color: var(--accent-teal); }
.text-muted   { color: var(--text-muted); }
.text-secondary { color: var(--text-secondary); }
.text-center  { text-align: center; }
.text-sm      { font-size: 0.875rem; }
.text-xs      { font-size: 0.75rem; }

.lead {
  font-size: 1.15rem;
  color: var(--text-secondary);
  line-height: 1.8;
}

/* =====================
   3. LAYOUT UTILITIES
===================== */
.container {
  width: 100%;
  max-width: var(--max-width);
  margin: 0 auto;
  padding: 0 var(--space-6);
}

.container--narrow {
  max-width: 800px;
}

.container--wide {
  max-width: 1400px;
}

.section {
  padding: var(--space-24) 0;
}

.section--sm {
  padding: var(--space-16) 0;
}

.section--lg {
  padding: var(--space-20) 0 var(--space-24);
}

.grid-2 { display: grid; grid-template-columns: repeat(2, 1fr); gap: var(--space-8); }
.grid-3 { display: grid; grid-template-columns: repeat(3, 1fr); gap: var(--space-6); }
.grid-4 { display: grid; grid-template-columns: repeat(4, 1fr); gap: var(--space-6); }

.flex        { display: flex; }
.flex-center { display: flex; align-items: center; justify-content: center; }
.gap-4       { gap: var(--space-4); }
.gap-6       { gap: var(--space-6); }
.gap-8       { gap: var(--space-8); }

.divider {
  border: none;
  border-top: 1px solid var(--border);
  margin: var(--space-12) 0;
}

/* =====================
   4. NAVIGATION
===================== */
.nav {
  position: sticky;
  top: 0;
  z-index: 100;
  height: var(--nav-height);
  background: rgba(6, 15, 30, 0.92);
  backdrop-filter: blur(16px);
  -webkit-backdrop-filter: blur(16px);
  border-bottom: 1px solid var(--border);
  display: flex;
  align-items: center;
}

.nav__inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  width: 100%;
  max-width: var(--max-width);
  margin: 0 auto;
  padding: 0 var(--space-6);
}

.nav__logo {
  display: flex;
  align-items: center;
  gap: var(--space-3);
  text-decoration: none;
}

.nav__logo-icon {
  width: 44px;
  height: 44px;
  flex-shrink: 0;
}

.nav__logo-text {
  font-family: var(--font-display);
  font-weight: 400;
  font-size: 1.1rem;
  letter-spacing: 0.08em;
  color: var(--text-primary);
  text-transform: uppercase;
  line-height: 1;
}

.nav__logo-text span {
  color: var(--accent-blue);
}

/* =====================
   BRAND TAGLINE
===================== */
.brand-tagline {
  font-family: var(--font-accent);
  font-weight: 700;
  font-size: 0.85rem;
  letter-spacing: 0.2em;
  text-transform: uppercase;
  color: var(--accent-teal);
  display: flex;
  align-items: center;
  justify-content: center;
  gap: var(--space-3);
}

.brand-tagline::before,
.brand-tagline::after {
  content: '';
  display: block;
  width: 32px;
  height: 1px;
  background: var(--accent-teal);
  opacity: 0.6;
}

/* =====================
   WAVE SEPARATOR
===================== */
.wave-separator {
  display: block;
  width: 100%;
  overflow: hidden;
  line-height: 0;
  margin-top: -2px;
  background: var(--bg-base);
}

.wave-separator svg {
  display: block;
  width: 100%;
  height: 80px;
}

/* =====================
   BRAND STRIP
===================== */
.brand-strip {
  background: var(--bg-surface);
  border-top: 1px solid var(--border);
  border-bottom: 1px solid var(--border);
  padding: var(--space-5) 0;
  overflow: hidden;
  position: relative;
}

.brand-strip__inner {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: var(--space-10);
  flex-wrap: wrap;
}

.brand-strip__item {
  font-family: var(--font-accent);
  font-weight: 700;
  font-size: 0.8rem;
  letter-spacing: 0.18em;
  text-transform: uppercase;
  color: var(--text-muted);
  display: flex;
  align-items: center;
  gap: var(--space-3);
}

.brand-strip__item .dot {
  width: 4px;
  height: 4px;
  background: var(--accent-blue);
  border-radius: 50%;
  flex-shrink: 0;
}

.brand-strip__item--highlight {
  color: var(--accent-blue);
}

/* =====================
   BRAND ICON (card icons as SVG)
===================== */
.card__icon {
  width: 52px;
  height: 52px;
  background: linear-gradient(135deg, rgba(0,200,255,0.12), rgba(0,229,176,0.08));
  border: 1px solid rgba(0,200,255,0.2);
  border-radius: var(--radius);
  display: flex;
  align-items: center;
  justify-content: center;
  margin-bottom: var(--space-5);
  flex-shrink: 0;
}

.card__icon svg {
  width: 26px;
  height: 26px;
}

.nav__links {
  display: flex;
  align-items: center;
  gap: var(--space-8);
}

.nav__links a {
  color: var(--text-secondary);
  font-size: 0.9rem;
  font-weight: 500;
  letter-spacing: 0.01em;
  transition: color var(--transition);
  white-space: nowrap;
}

.nav__links a:hover,
.nav__links a.active {
  color: var(--text-primary);
}

.nav__cta {
  background: var(--accent-grad);
  color: var(--bg-base) !important;
  padding: var(--space-2) var(--space-5);
  border-radius: var(--radius-sm);
  font-weight: 700 !important;
  font-size: 0.85rem !important;
  transition: opacity var(--transition) !important;
}

.nav__cta:hover { opacity: 0.85; color: var(--bg-base) !important; }

/* Hamburger */
.nav__toggle {
  display: none;
  flex-direction: column;
  gap: 5px;
  background: none;
  border: none;
  padding: var(--space-2);
}

.nav__toggle span {
  display: block;
  width: 24px;
  height: 2px;
  background: var(--text-primary);
  border-radius: 2px;
  transition: transform var(--transition), opacity var(--transition);
}

.nav__toggle.open span:nth-child(1) { transform: translateY(7px) rotate(45deg); }
.nav__toggle.open span:nth-child(2) { opacity: 0; }
.nav__toggle.open span:nth-child(3) { transform: translateY(-7px) rotate(-45deg); }

/* =====================
   5. HERO
===================== */
.hero {
  position: relative;
  min-height: calc(100vh - var(--nav-height));
  display: flex;
  align-items: center;
  padding: var(--space-20) 0 var(--space-16);
  overflow: hidden;
}

.hero__bg {
  position: absolute;
  inset: 0;
  background:
    radial-gradient(ellipse 80% 50% at 50% -10%, rgba(0, 200, 255, 0.14) 0%, transparent 60%),
    radial-gradient(ellipse 60% 40% at 80% 60%, rgba(0, 229, 176, 0.08) 0%, transparent 50%),
    radial-gradient(ellipse 40% 30% at 20% 80%, rgba(0, 200, 255, 0.05) 0%, transparent 50%);
  pointer-events: none;
}

.hero__grid-lines {
  position: absolute;
  inset: 0;
  background-image:
    linear-gradient(rgba(30, 58, 95, 0.3) 1px, transparent 1px),
    linear-gradient(90deg, rgba(30, 58, 95, 0.3) 1px, transparent 1px);
  background-size: 60px 60px;
  pointer-events: none;
  mask-image: radial-gradient(ellipse 100% 100% at 50% 0%, black 30%, transparent 80%);
}

.hero__content {
  position: relative;
  z-index: 1;
  text-align: center;
  max-width: 900px;
  margin: 0 auto;
}

.hero__eyebrow {
  display: inline-flex;
  align-items: center;
  gap: var(--space-2);
  background: rgba(0, 200, 255, 0.1);
  border: 1px solid rgba(0, 200, 255, 0.3);
  color: var(--accent-blue);
  font-family: var(--font-accent);
  font-size: 0.85rem;
  font-weight: 600;
  letter-spacing: 0.15em;
  text-transform: uppercase;
  padding: var(--space-2) var(--space-4);
  border-radius: 999px;
  margin-bottom: var(--space-6);
}

.hero__eyebrow::before {
  content: '';
  width: 6px;
  height: 6px;
  background: var(--accent-blue);
  border-radius: 50%;
  animation: pulse 2s ease-in-out infinite;
}

.hero__title {
  margin-bottom: var(--space-6);
}

.hero__subtitle {
  font-size: clamp(1rem, 2vw, 1.2rem);
  color: var(--text-secondary);
  max-width: 640px;
  margin: 0 auto var(--space-8);
  line-height: 1.75;
}

.hero__stats {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: var(--space-8);
  margin: var(--space-10) 0;
  flex-wrap: wrap;
}

.hero__stat {
  text-align: center;
}

.hero__stat-number {
  font-family: var(--font-display);
  font-size: 2rem;
  font-weight: 800;
  background: var(--accent-grad);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
  line-height: 1;
  margin-bottom: var(--space-1);
}

.hero__stat-label {
  font-size: 0.8rem;
  color: var(--text-muted);
  text-transform: uppercase;
  letter-spacing: 0.06em;
}

.hero__stat-divider {
  width: 1px;
  height: 40px;
  background: var(--border);
}

/* =====================
   6. LOOKUP TOOL
===================== */
.lookup {
  background: var(--bg-surface);
  border: 1px solid var(--border);
  border-radius: var(--radius-xl);
  padding: var(--space-10);
  box-shadow: var(--shadow-lg), var(--glow-blue);
  max-width: 780px;
  margin: var(--space-10) auto 0;
  position: relative;
}

.lookup::before {
  content: '';
  position: absolute;
  inset: -1px;
  border-radius: var(--radius-xl);
  background: var(--accent-grad);
  z-index: -1;
  opacity: 0.25;
}

.lookup__title {
  font-size: 1.1rem;
  font-weight: 700;
  margin-bottom: var(--space-6);
  color: var(--text-primary);
  text-align: center;
}

.lookup__title span { color: var(--accent-blue); }

.lookup__fields {
  display: grid;
  grid-template-columns: 1fr 1fr 1fr auto;
  gap: var(--space-3);
  align-items: end;
}

.lookup__field label {
  display: block;
  font-size: 0.75rem;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.06em;
  color: var(--text-muted);
  margin-bottom: var(--space-2);
}

.lookup__field select {
  width: 100%;
  background: var(--bg-input);
  border: 1px solid var(--border);
  color: var(--text-primary);
  padding: var(--space-3) var(--space-4);
  border-radius: var(--radius-sm);
  font-size: 0.95rem;
  appearance: none;
  background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='12' height='7' viewBox='0 0 12 7'%3E%3Cpath d='M1 1l5 5 5-5' stroke='%238ba3c7' stroke-width='1.5' fill='none' stroke-linecap='round'/%3E%3C/svg%3E");
  background-repeat: no-repeat;
  background-position: right 12px center;
  cursor: pointer;
  transition: border-color var(--transition), box-shadow var(--transition);
}

.lookup__field select:focus {
  outline: none;
  border-color: var(--accent-blue);
  box-shadow: 0 0 0 3px rgba(0, 200, 255, 0.15);
}

.lookup__field select:disabled {
  opacity: 0.45;
  cursor: not-allowed;
}

/* =====================
   7. BUTTONS
===================== */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: var(--space-2);
  padding: var(--space-3) var(--space-6);
  border-radius: var(--radius-sm);
  font-weight: 700;
  font-size: 0.95rem;
  letter-spacing: 0.01em;
  border: none;
  transition: transform var(--transition), opacity var(--transition), box-shadow var(--transition);
  white-space: nowrap;
  text-decoration: none;
}

.btn:hover { transform: translateY(-1px); }
.btn:active { transform: translateY(0); }

.btn--primary {
  background: var(--accent-grad);
  color: var(--bg-base);
}

.btn--primary:hover {
  opacity: 0.9;
  box-shadow: var(--glow-blue);
  color: var(--bg-base);
}

.btn--secondary {
  background: var(--bg-raised);
  color: var(--text-primary);
  border: 1px solid var(--border);
}

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

.btn--outline {
  background: transparent;
  border: 2px solid var(--accent-blue);
  color: var(--accent-blue);
}

.btn--outline:hover {
  background: rgba(0, 200, 255, 0.1);
  color: var(--accent-blue);
}

.btn--lg {
  padding: var(--space-4) var(--space-8);
  font-size: 1.05rem;
  border-radius: var(--radius);
}

.btn--sm {
  padding: var(--space-2) var(--space-4);
  font-size: 0.85rem;
}

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

.btn--find {
  background: var(--accent-grad);
  color: var(--bg-base);
  padding: var(--space-3) var(--space-6);
  border-radius: var(--radius-sm);
  font-weight: 700;
  font-size: 0.9rem;
  border: none;
  height: 100%;
  min-height: 46px;
  white-space: nowrap;
  transition: opacity var(--transition), transform var(--transition);
}

.btn--find:hover { opacity: 0.88; transform: translateY(-1px); }

/* =====================
   8. RESULT CARD
===================== */
.result-card {
  display: none;
  margin-top: var(--space-8);
  background: var(--bg-raised);
  border: 1px solid var(--border-light);
  border-radius: var(--radius-lg);
  padding: var(--space-8);
  animation: fadeSlideUp 0.35s ease forwards;
}

.result-card.visible { display: block; }

.result-card__header {
  display: flex;
  align-items: flex-start;
  justify-content: space-between;
  flex-wrap: wrap;
  gap: var(--space-4);
  margin-bottom: var(--space-6);
}

.result-card__badge {
  display: inline-flex;
  align-items: center;
  gap: var(--space-2);
  background: rgba(0, 229, 176, 0.12);
  border: 1px solid rgba(0, 229, 176, 0.3);
  color: var(--accent-teal);
  font-size: 0.75rem;
  font-weight: 700;
  letter-spacing: 0.06em;
  text-transform: uppercase;
  padding: var(--space-1) var(--space-3);
  border-radius: 999px;
}

.result-card__title { font-size: 1.4rem; color: var(--text-primary); }
.result-card__price {
  font-size: 2rem;
  font-weight: 800;
  background: var(--accent-grad);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

.result-card__specs {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: var(--space-4);
  margin-bottom: var(--space-6);
}

.result-spec {
  background: var(--bg-surface);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: var(--space-4);
  text-align: center;
}

.result-spec__value {
  font-size: 1.4rem;
  font-weight: 800;
  color: var(--accent-blue);
  line-height: 1;
  margin-bottom: var(--space-1);
}

.result-spec__label {
  font-size: 0.7rem;
  color: var(--text-muted);
  text-transform: uppercase;
  letter-spacing: 0.06em;
}

.result-card__actions {
  display: flex;
  gap: var(--space-3);
  flex-wrap: wrap;
}

/* =====================
   9. FEATURE CARDS
===================== */
.card {
  background: var(--bg-surface);
  border: 1px solid var(--border);
  border-radius: var(--radius-lg);
  padding: var(--space-8);
  transition: border-color var(--transition), transform var(--transition), box-shadow var(--transition);
}

.card:hover {
  border-color: var(--accent-blue);
  transform: translateY(-3px);
  box-shadow: var(--glow-blue);
}

.card__icon {
  width: 48px;
  height: 48px;
  background: linear-gradient(135deg, rgba(0,200,255,0.15), rgba(0,229,176,0.1));
  border: 1px solid rgba(0,200,255,0.2);
  border-radius: var(--radius);
  display: flex;
  align-items: center;
  justify-content: center;
  margin-bottom: var(--space-5);
  font-size: 1.4rem;
}

.card h3 {
  font-size: 1.1rem;
  margin-bottom: var(--space-3);
  color: var(--text-primary);
}

.card p {
  font-size: 0.9rem;
  color: var(--text-secondary);
  margin-bottom: 0;
}

/* =====================
  10. COMPARISON TABLE
===================== */
.comparison-table {
  width: 100%;
  border-collapse: separate;
  border-spacing: 0;
  border-radius: var(--radius-lg);
  overflow: hidden;
  border: 1px solid var(--border);
  margin: var(--space-8) 0;
}

.comparison-table th {
  background: var(--bg-raised);
  padding: var(--space-4) var(--space-6);
  font-size: 0.85rem;
  font-weight: 700;
  letter-spacing: 0.04em;
  text-transform: uppercase;
  text-align: left;
  border-bottom: 1px solid var(--border);
}

.comparison-table th.highlight {
  background: linear-gradient(135deg, rgba(0,200,255,0.15), rgba(0,229,176,0.1));
  color: var(--accent-blue);
}

.comparison-table td {
  padding: var(--space-4) var(--space-6);
  font-size: 0.9rem;
  border-bottom: 1px solid var(--border);
  vertical-align: middle;
  color: var(--text-secondary);
}

.comparison-table td.highlight {
  background: rgba(0,200,255,0.04);
  color: var(--text-primary);
  font-weight: 600;
}

.comparison-table tr:last-child td { border-bottom: none; }

.check { color: var(--success); font-size: 1.1rem; }
.cross { color: var(--error); font-size: 1.1rem; }
.neutral { color: var(--warning); font-size: 1.1rem; }

/* =====================
  11. FAQ ACCORDION
===================== */
.faq-list {
  display: flex;
  flex-direction: column;
  gap: var(--space-3);
  max-width: 800px;
  margin: 0 auto;
}

.faq-item {
  background: var(--bg-surface);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  overflow: hidden;
  transition: border-color var(--transition);
}

.faq-item.open {
  border-color: var(--accent-blue);
}

.faq-question {
  width: 100%;
  background: none;
  border: none;
  padding: var(--space-6);
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: var(--space-4);
  text-align: left;
  font-size: 1rem;
  font-weight: 600;
  color: var(--text-primary);
  cursor: pointer;
  transition: color var(--transition);
}

.faq-question:hover { color: var(--accent-blue); }

.faq-chevron {
  width: 20px;
  height: 20px;
  flex-shrink: 0;
  transition: transform var(--transition);
  color: var(--text-muted);
}

.faq-item.open .faq-chevron {
  transform: rotate(180deg);
  color: var(--accent-blue);
}

.faq-answer {
  max-height: 0;
  overflow: hidden;
  transition: max-height 0.3s ease, padding 0.2s ease;
}

.faq-item.open .faq-answer {
  max-height: 400px;
}

.faq-answer-inner {
  padding: 0 var(--space-6) var(--space-6);
  color: var(--text-secondary);
  font-size: 0.95rem;
  line-height: 1.8;
  border-top: 1px solid var(--border);
  padding-top: var(--space-5);
}

.faq-answer-inner p { margin-bottom: var(--space-3); }
.faq-answer-inner p:last-child { margin-bottom: 0; }

/* =====================
  12. CONTACT FORM
===================== */
.form-group {
  margin-bottom: var(--space-5);
}

.form-group label {
  display: block;
  font-size: 0.85rem;
  font-weight: 600;
  color: var(--text-secondary);
  margin-bottom: var(--space-2);
  letter-spacing: 0.02em;
}

.form-control {
  width: 100%;
  background: var(--bg-input);
  border: 1px solid var(--border);
  color: var(--text-primary);
  padding: var(--space-3) var(--space-4);
  border-radius: var(--radius-sm);
  font-size: 0.95rem;
  transition: border-color var(--transition), box-shadow var(--transition);
}

.form-control:focus {
  outline: none;
  border-color: var(--accent-blue);
  box-shadow: 0 0 0 3px rgba(0,200,255,0.12);
}

.form-control::placeholder { color: var(--text-muted); }

textarea.form-control {
  resize: vertical;
  min-height: 140px;
}

/* =====================
  13. SECTION HEADERS
===================== */
.section-header {
  text-align: center;
  max-width: 680px;
  margin: 0 auto var(--space-12);
}

.section-header .eyebrow {
  display: inline-block;
  font-family: var(--font-accent);
  font-size: 0.8rem;
  font-weight: 700;
  letter-spacing: 0.18em;
  text-transform: uppercase;
  color: var(--accent-teal);
  margin-bottom: var(--space-3);
}

.section-header h2 { margin-bottom: var(--space-4); }

.section-header p {
  font-size: 1.05rem;
  color: var(--text-secondary);
  margin: 0;
}

/* =====================
  14. STEPS / PROCESS
===================== */
.steps {
  display: flex;
  flex-direction: column;
  gap: var(--space-6);
  max-width: 760px;
  margin: 0 auto;
}

.step {
  display: grid;
  grid-template-columns: 56px 1fr;
  gap: var(--space-5);
  align-items: flex-start;
}

.step__number {
  width: 56px;
  height: 56px;
  background: linear-gradient(135deg, rgba(0,200,255,0.15), rgba(0,229,176,0.1));
  border: 2px solid rgba(0,200,255,0.3);
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  font-family: var(--font-display);
  font-size: 1.3rem;
  font-weight: 800;
  color: var(--accent-blue);
  flex-shrink: 0;
}

.step__content h4 {
  color: var(--text-primary);
  margin-bottom: var(--space-2);
  font-size: 1.05rem;
}

.step__content p {
  font-size: 0.9rem;
  color: var(--text-secondary);
  margin: 0;
}

/* =====================
  15. CALLOUT / ALERT BOX
===================== */
.callout {
  background: rgba(0,200,255,0.07);
  border: 1px solid rgba(0,200,255,0.25);
  border-radius: var(--radius);
  padding: var(--space-5) var(--space-6);
  margin: var(--space-6) 0;
}

.callout--warning {
  background: rgba(255,107,53,0.07);
  border-color: rgba(255,107,53,0.3);
}

.callout--success {
  background: rgba(34,197,94,0.07);
  border-color: rgba(34,197,94,0.3);
}

.callout__title {
  font-weight: 700;
  color: var(--accent-blue);
  margin-bottom: var(--space-2);
  font-size: 0.9rem;
  text-transform: uppercase;
  letter-spacing: 0.05em;
}

.callout--warning .callout__title { color: var(--accent-orange); }
.callout--success .callout__title  { color: var(--success); }

.callout p {
  font-size: 0.9rem;
  color: var(--text-secondary);
  margin: 0;
}

/* =====================
  16. BADGE / TAG
===================== */
.badge {
  display: inline-flex;
  align-items: center;
  gap: var(--space-1);
  padding: 3px 10px;
  border-radius: 999px;
  font-size: 0.72rem;
  font-weight: 700;
  letter-spacing: 0.05em;
  text-transform: uppercase;
}

.badge--blue {
  background: rgba(0,200,255,0.12);
  color: var(--accent-blue);
  border: 1px solid rgba(0,200,255,0.25);
}

.badge--teal {
  background: rgba(0,229,176,0.12);
  color: var(--accent-teal);
  border: 1px solid rgba(0,229,176,0.25);
}

.badge--orange {
  background: rgba(255,107,53,0.12);
  color: var(--accent-orange);
  border: 1px solid rgba(255,107,53,0.25);
}

/* =====================
  17. FOOTER
===================== */
.footer {
  background: var(--bg-surface);
  border-top: 1px solid var(--border);
  padding: var(--space-16) 0 var(--space-8);
  margin-top: var(--space-16);
}

.footer__grid {
  display: grid;
  grid-template-columns: 2fr 1fr 1fr 1fr;
  gap: var(--space-10);
  margin-bottom: var(--space-10);
}

.footer__brand p {
  font-size: 0.88rem;
  color: var(--text-muted);
  line-height: 1.7;
  margin-top: var(--space-4);
  margin-bottom: 0;
}

.footer__col h5 {
  font-size: 0.75rem;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.1em;
  color: var(--text-muted);
  margin-bottom: var(--space-4);
}

.footer__col ul { display: flex; flex-direction: column; gap: var(--space-3); }

.footer__col a {
  color: var(--text-secondary);
  font-size: 0.875rem;
  transition: color var(--transition);
}

.footer__col a:hover { color: var(--accent-blue); }

.footer__bottom {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding-top: var(--space-6);
  border-top: 1px solid var(--border);
  flex-wrap: wrap;
  gap: var(--space-4);
}

.footer__bottom p {
  font-size: 0.8rem;
  color: var(--text-muted);
  margin: 0;
}

/* =====================
  18. HERO DIAGRAM (SVG-based)
===================== */
.diagram-wrapper {
  background: var(--bg-surface);
  border: 1px solid var(--border);
  border-radius: var(--radius-lg);
  padding: var(--space-8);
  margin: var(--space-8) 0;
}

.diagram-title {
  font-size: 0.8rem;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.08em;
  color: var(--text-muted);
  text-align: center;
  margin-bottom: var(--space-5);
}

/* =====================
  19. PAGE HERO (inner pages)
===================== */
.page-hero {
  padding: var(--space-16) 0 var(--space-12);
  text-align: center;
  position: relative;
  overflow: hidden;
}

.page-hero::before {
  content: '';
  position: absolute;
  inset: 0;
  background: radial-gradient(ellipse 80% 60% at 50% 0%, rgba(0,200,255,0.09) 0%, transparent 65%);
  pointer-events: none;
}

.page-hero .eyebrow {
  display: inline-block;
  font-family: var(--font-accent);
  font-size: 0.8rem;
  font-weight: 700;
  letter-spacing: 0.18em;
  text-transform: uppercase;
  color: var(--accent-teal);
  margin-bottom: var(--space-3);
}

.page-hero h1 { margin-bottom: var(--space-4); }
.page-hero p.lead { max-width: 640px; margin: 0 auto; }

/* =====================
  20. ANIMATIONS
===================== */
@keyframes pulse {
  0%, 100% { opacity: 1; }
  50% { opacity: 0.3; }
}

@keyframes fadeSlideUp {
  from { opacity: 0; transform: translateY(16px); }
  to   { opacity: 1; transform: translateY(0); }
}

@keyframes shimmer {
  0% { background-position: -200% center; }
  100% { background-position: 200% center; }
}

/* =====================
  21. RESPONSIVE
===================== */
@media (max-width: 1024px) {
  .grid-4 { grid-template-columns: repeat(2, 1fr); }
  .footer__grid { grid-template-columns: 1fr 1fr; }
}

@media (max-width: 768px) {
  :root { --nav-height: 64px; }

  .nav__links { display: none; flex-direction: column; gap: var(--space-1); }
  .nav__links.open {
    display: flex;
    position: absolute;
    top: var(--nav-height);
    left: 0;
    right: 0;
    background: rgba(6,15,30,0.98);
    border-bottom: 1px solid var(--border);
    padding: var(--space-4) var(--space-6);
    backdrop-filter: blur(16px);
  }
  .nav__links.open a { padding: var(--space-3) 0; border-bottom: 1px solid var(--border); }
  .nav__toggle { display: flex; }

  .hero { padding: var(--space-12) 0; min-height: auto; }
  .hero__stats { gap: var(--space-6); }
  .hero__stat-divider { display: none; }

  .lookup { padding: var(--space-6); border-radius: var(--radius-lg); }
  .lookup__fields { grid-template-columns: 1fr; }
  .btn--find { width: 100%; }

  .result-card__specs { grid-template-columns: repeat(2, 1fr); }

  .grid-2, .grid-3 { grid-template-columns: 1fr; }
  .footer__grid { grid-template-columns: 1fr; gap: var(--space-8); }

  .comparison-table { font-size: 0.82rem; }
  .comparison-table th, .comparison-table td { padding: var(--space-3) var(--space-4); }

  .step { grid-template-columns: 44px 1fr; }
  .step__number { width: 44px; height: 44px; font-size: 1.1rem; }

  .footer__bottom { flex-direction: column; text-align: center; }
}

@media (max-width: 480px) {
  :root { --space-24: 4rem; --space-20: 3rem; --space-16: 2.5rem; }
  h1 { font-size: 2rem; }
  h2 { font-size: 1.6rem; }
  .result-card__header { flex-direction: column; }
  .result-card__actions { flex-direction: column; }
}