/* ===========================
   MY SCREEN SIZE — STYLESHEET
   Aesthetic: Dark Precision Lab
   =========================== */

:root {
  --bg: #080c18;
  --bg-2: #0d1325;
  --bg-3: #111828;
  --surface: #141d30;
  --surface-2: #1a2540;
  --border: rgba(99, 179, 255, 0.10);
  --border-2: rgba(99, 179, 255, 0.20);
  --text: #e8eef8;
  --text-2: #8fa0bf;
  --text-3: #5a6e8a;
  --accent: #3b8fff;
  --accent-2: #00e5c8;
  --accent-3: #7c5cfc;
  --danger: #ff4f6e;
  --warn: #f5a623;
  --success: #00d68f;
  --font-display: 'Syne', sans-serif;
  --font-mono: 'DM Mono', monospace;
  --font-body: 'DM Sans', sans-serif;
  --radius: 16px;
  --radius-sm: 8px;
  --shadow: 0 4px 32px rgba(0,0,0,0.4);
  --transition: 0.3s cubic-bezier(0.4, 0, 0.2, 1);
}

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

html { scroll-behavior: smooth; }

body {
  background: var(--bg);
  color: var(--text);
  font-family: var(--font-body);
  font-size: 16px;
  line-height: 1.65;
  overflow-x: hidden;
}

::selection { background: rgba(59, 143, 255, 0.3); }

/* ---- UTILITIES ---- */
.container {
  max-width: 1160px;
  margin: 0 auto;
  padding: 0 24px;
}

.gradient-text {
  background: linear-gradient(135deg, var(--accent) 0%, var(--accent-2) 100%);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

.section-tag {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  font-family: var(--font-mono);
  font-size: 0.72rem;
  font-weight: 500;
  letter-spacing: 0.15em;
  text-transform: uppercase;
  color: var(--accent-2);
  border: 1px solid rgba(0, 229, 200, 0.2);
  padding: 5px 14px;
  border-radius: 100px;
  margin-bottom: 20px;
}

.section-title {
  font-family: var(--font-display);
  font-size: clamp(2rem, 4vw, 3rem);
  font-weight: 800;
  line-height: 1.15;
  margin-bottom: 14px;
}

.section-sub {
  color: var(--text-2);
  font-size: 1.05rem;
  max-width: 560px;
  margin-bottom: 56px;
}

/* ---- ANIMATE IN ---- */
.animate-in {
  opacity: 0;
  transform: translateY(28px);
  animation: animIn 0.7s ease forwards;
  animation-delay: var(--delay, 0s);
}

@keyframes animIn {
  to { opacity: 1; transform: translateY(0); }
}

.reveal {
  opacity: 0;
  transform: translateY(32px);
  transition: opacity 0.6s ease, transform 0.6s ease;
}
.reveal.visible {
  opacity: 1;
  transform: translateY(0);
}

/* ========================================
   HEADER
======================================== */
#site-header {
  position: fixed;
  top: 0; left: 0; right: 0;
  z-index: 1000;
  padding: 0 32px;
  height: 68px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  background: rgba(8, 12, 24, 0.75);
  backdrop-filter: blur(16px);
  border-bottom: 1px solid var(--border);
  transition: background var(--transition);
}

.header-logo {
  display: flex;
  align-items: center;
  gap: 10px;
  text-decoration: none;
  font-family: var(--font-display);
  font-weight: 700;
  font-size: 1.15rem;
  color: var(--text);
  letter-spacing: -0.01em;
}

.logo-icon {
  width: 36px; height: 36px;
  background: linear-gradient(135deg, var(--accent), var(--accent-2));
  border-radius: 9px;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 1rem;
  flex-shrink: 0;
}

.header-nav {
  display: flex;
  align-items: center;
  gap: 6px;
  list-style: none;
}

.header-nav a {
  color: var(--text-2);
  text-decoration: none;
  font-size: 0.88rem;
  font-weight: 500;
  padding: 6px 14px;
  border-radius: 8px;
  transition: color var(--transition), background var(--transition);
}

.header-nav a:hover {
  color: var(--text);
  background: var(--surface);
}

.header-actions {
  display: flex;
  align-items: center;
  gap: 10px;
}

.header-live {
  display: flex;
  align-items: center;
  gap: 7px;
  font-family: var(--font-mono);
  font-size: 0.78rem;
  color: var(--accent-2);
  background: rgba(0, 229, 200, 0.07);
  border: 1px solid rgba(0, 229, 200, 0.15);
  padding: 5px 12px;
  border-radius: 100px;
}

.live-dot {
  width: 7px; height: 7px;
  border-radius: 50%;
  background: var(--accent-2);
  animation: pulse 1.5s ease-in-out infinite;
}

@keyframes pulse {
  0%, 100% { opacity: 1; transform: scale(1); }
  50% { opacity: 0.4; transform: scale(0.75); }
}

.hamburger {
  display: none;
  flex-direction: column;
  gap: 5px;
  cursor: pointer;
  padding: 6px;
  background: none;
  border: none;
}

.hamburger span {
  display: block;
  width: 24px; height: 2px;
  background: var(--text-2);
  border-radius: 2px;
  transition: var(--transition);
}

.mobile-nav {
  display: none;
  position: fixed;
  top: 68px; left: 0; right: 0;
  background: rgba(8, 12, 24, 0.97);
  backdrop-filter: blur(16px);
  padding: 20px 24px;
  z-index: 999;
  border-bottom: 1px solid var(--border);
  flex-direction: column;
  gap: 4px;
}

.mobile-nav.open { display: flex; }
.mobile-nav a {
  color: var(--text-2);
  text-decoration: none;
  font-size: 1rem;
  padding: 12px 0;
  border-bottom: 1px solid var(--border);
}
.mobile-nav a:last-child { border-bottom: none; }

/* ========================================
   HERO
======================================== */
.hero {
  position: relative;
  min-height: 100vh;
  display: flex;
  align-items: center;
  overflow: hidden;
  padding: 120px 0 80px;
}

.hero-bg {
  position: absolute;
  inset: 0;
  z-index: 0;
}

#grid-canvas {
  position: absolute;
  inset: 0;
  width: 100%;
  height: 100%;
  opacity: 0.4;
}

.hero-glow {
  position: absolute;
  border-radius: 50%;
  filter: blur(100px);
  pointer-events: none;
}

.glow-1 {
  width: 600px; height: 600px;
  background: radial-gradient(circle, rgba(59, 143, 255, 0.18) 0%, transparent 70%);
  top: -150px; left: -100px;
  animation: glowFloat 8s ease-in-out infinite;
}

.glow-2 {
  width: 500px; height: 500px;
  background: radial-gradient(circle, rgba(124, 92, 252, 0.14) 0%, transparent 70%);
  bottom: -100px; right: -80px;
  animation: glowFloat 10s ease-in-out infinite reverse;
}

@keyframes glowFloat {
  0%, 100% { transform: translate(0, 0); }
  50% { transform: translate(30px, -40px); }
}

.hero-content {
  position: relative;
  z-index: 1;
  text-align: center;
}

.hero-badge {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  font-family: var(--font-mono);
  font-size: 0.78rem;
  color: var(--accent-2);
  border: 1px solid rgba(0, 229, 200, 0.2);
  padding: 6px 16px;
  border-radius: 100px;
  margin-bottom: 28px;
  background: rgba(0, 229, 200, 0.05);
}

.badge-dot {
  width: 6px; height: 6px;
  border-radius: 50%;
  background: var(--accent-2);
  animation: pulse 1.5s infinite;
}

.hero-title {
  font-family: var(--font-display);
  font-size: clamp(3rem, 8vw, 6.5rem);
  font-weight: 800;
  line-height: 1.05;
  letter-spacing: -0.02em;
  margin-bottom: 24px;
}

.hero-subtitle {
  font-size: clamp(1rem, 2vw, 1.2rem);
  color: var(--text-2);
  margin-bottom: 40px;
  line-height: 1.7;
}

.br-hide { display: none; }
@media (min-width: 640px) { .br-hide { display: inline; } }

.hero-cta {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 16px;
  flex-wrap: wrap;
  margin-bottom: 60px;
}

.btn-primary {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  background: linear-gradient(135deg, var(--accent), var(--accent-3));
  color: #fff;
  text-decoration: none;
  font-family: var(--font-display);
  font-weight: 700;
  font-size: 0.95rem;
  padding: 14px 32px;
  border-radius: 12px;
  transition: transform var(--transition), box-shadow var(--transition);
  box-shadow: 0 4px 24px rgba(59, 143, 255, 0.3);
}

.btn-primary:hover {
  transform: translateY(-2px);
  box-shadow: 0 8px 32px rgba(59, 143, 255, 0.45);
}

.btn-ghost {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  color: var(--text-2);
  text-decoration: none;
  font-weight: 500;
  font-size: 0.95rem;
  padding: 14px 24px;
  border-radius: 12px;
  border: 1px solid var(--border-2);
  transition: color var(--transition), border-color var(--transition), background var(--transition);
}

.btn-ghost:hover {
  color: var(--text);
  border-color: rgba(99, 179, 255, 0.35);
  background: var(--surface);
}

.hero-quick-stats {
  display: inline-flex;
  align-items: center;
  gap: 32px;
  background: var(--surface);
  border: 1px solid var(--border);
  padding: 20px 36px;
  border-radius: var(--radius);
  backdrop-filter: blur(8px);
}

.qs-item { text-align: center; }
.qs-val {
  display: block;
  font-family: var(--font-mono);
  font-size: 1.4rem;
  font-weight: 500;
  color: var(--text);
  margin-bottom: 4px;
}
.qs-label {
  font-size: 0.75rem;
  color: var(--text-3);
  text-transform: uppercase;
  letter-spacing: 0.1em;
}
.qs-divider {
  width: 1px;
  height: 40px;
  background: var(--border-2);
}

.scroll-hint {
  position: absolute;
  bottom: 32px;
  left: 50%;
  transform: translateX(-50%);
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 8px;
  color: var(--text-3);
  font-size: 0.72rem;
  letter-spacing: 0.12em;
  text-transform: uppercase;
}

.scroll-line {
  width: 1px;
  height: 40px;
  background: linear-gradient(to bottom, var(--accent), transparent);
  animation: scrollDrop 1.8s ease-in-out infinite;
}

@keyframes scrollDrop {
  0% { transform: scaleY(0); transform-origin: top; opacity: 0; }
  50% { transform: scaleY(1); opacity: 1; }
  100% { transform: scaleY(0); transform-origin: bottom; opacity: 0; }
}

/* ========================================
   DETECTOR
======================================== */
.detector {
  padding: 120px 0;
  background: var(--bg-2);
  position: relative;
}

.detector::before {
  content: '';
  position: absolute;
  top: 0; left: 0; right: 0;
  height: 1px;
  background: linear-gradient(90deg, transparent, var(--accent), transparent);
}

.detector-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  grid-template-rows: auto auto;
  gap: 20px;
}

/* Primary card */
.det-card {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 28px;
  position: relative;
  overflow: hidden;
  transition: border-color var(--transition);
}

.det-card:hover { border-color: var(--border-2); }

.det-card::before {
  content: '';
  position: absolute;
  top: 0; left: 0; right: 0;
  height: 2px;
  background: linear-gradient(90deg, var(--accent), var(--accent-2));
  opacity: 0;
  transition: opacity var(--transition);
}

.det-card:hover::before { opacity: 1; }

.det-card--primary {
  grid-column: 1;
  grid-row: 1;
}

.det-card__label {
  font-family: var(--font-mono);
  font-size: 0.72rem;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: var(--text-3);
  margin-bottom: 12px;
}

.det-card__value {
  font-family: var(--font-mono);
  font-size: clamp(1.6rem, 3vw, 2.5rem);
  font-weight: 500;
  color: var(--text);
  line-height: 1.1;
  margin-bottom: 8px;
}

.det-card__sub {
  font-family: var(--font-mono);
  font-size: 0.85rem;
  color: var(--text-3);
  margin-bottom: 20px;
}

.det-card__visual {
  display: flex;
  gap: 8px;
  align-items: flex-end;
  height: 48px;
}

.res-bar {
  background: linear-gradient(135deg, var(--accent), var(--accent-2));
  border-radius: 4px;
  height: 16px;
  transition: width 0.8s ease;
  position: relative;
}

.res-bar--h {
  height: 40px;
  width: 6px !important;
}

/* Metrics Grid */
.det-metrics {
  grid-column: 2;
  grid-row: 1 / 3;
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 14px;
}

.met-card {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius-sm);
  padding: 18px;
  display: flex;
  align-items: flex-start;
  gap: 14px;
  transition: border-color var(--transition), background var(--transition);
}

.met-card:hover {
  border-color: var(--border-2);
  background: var(--surface-2);
}

.met-icon {
  font-size: 1.4rem;
  opacity: 0.7;
  margin-top: 2px;
  flex-shrink: 0;
}

.met-label {
  font-size: 0.78rem;
  color: var(--text-3);
  margin-bottom: 6px;
  text-transform: uppercase;
  letter-spacing: 0.08em;
}

.met-val {
  font-family: var(--font-mono);
  font-size: 1.05rem;
  color: var(--text);
  font-weight: 500;
}

/* Device Card */
.det-card--device {
  grid-column: 1;
  grid-row: 2;
}

.device-icon-wrap {
  margin: 8px 0 12px;
}

.device-icon {
  font-size: 2.5rem;
  display: inline-block;
  animation: deviceFloat 4s ease-in-out infinite;
}

@keyframes deviceFloat {
  0%, 100% { transform: translateY(0); }
  50% { transform: translateY(-6px); }
}

.device-details {
  margin-top: 16px;
  display: flex;
  flex-direction: column;
  gap: 10px;
}

.dd-row {
  display: flex;
  justify-content: space-between;
  align-items: center;
  font-size: 0.88rem;
  padding-bottom: 10px;
  border-bottom: 1px solid var(--border);
}

.dd-row:last-child { border-bottom: none; padding-bottom: 0; }
.dd-row span:first-child { color: var(--text-3); }
.dd-row span:last-child { font-family: var(--font-mono); color: var(--text); font-size: 0.82rem; }

/* Physical Card */
.det-card--physical {
  grid-column: 1 / 3;
}

.physical-input-row {
  display: flex;
  align-items: center;
  gap: 12px;
  flex-wrap: wrap;
  margin-bottom: 20px;
}

.physical-input-row label {
  color: var(--text-2);
  font-size: 0.88rem;
}

.physical-input-row input {
  background: var(--bg);
  border: 1px solid var(--border-2);
  color: var(--text);
  padding: 9px 14px;
  border-radius: var(--radius-sm);
  font-family: var(--font-mono);
  font-size: 0.9rem;
  width: 120px;
  outline: none;
  transition: border-color var(--transition);
}

.physical-input-row input:focus { border-color: var(--accent); }

.btn-small {
  background: linear-gradient(135deg, var(--accent), var(--accent-3));
  color: #fff;
  border: none;
  padding: 9px 20px;
  border-radius: var(--radius-sm);
  font-family: var(--font-display);
  font-size: 0.85rem;
  font-weight: 700;
  cursor: pointer;
  transition: opacity var(--transition), transform var(--transition);
}

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

.physical-results {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 16px;
}

.pr-row {
  background: var(--bg);
  border: 1px solid var(--border);
  border-radius: var(--radius-sm);
  padding: 14px 16px;
  display: flex;
  flex-direction: column;
  gap: 6px;
}

.pr-row span:first-child {
  font-size: 0.72rem;
  color: var(--text-3);
  text-transform: uppercase;
  letter-spacing: 0.1em;
}

.pr-row span:last-child {
  font-family: var(--font-mono);
  font-size: 1rem;
  color: var(--text);
  font-weight: 500;
}

/* Copy Bar */
.copy-bar {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 16px;
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius-sm);
  padding: 14px 20px;
  margin-top: 20px;
  flex-wrap: wrap;
}

#copy-text {
  font-family: var(--font-mono);
  font-size: 0.88rem;
  color: var(--text-2);
}

.btn-copy {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  background: transparent;
  color: var(--accent);
  border: 1px solid rgba(59, 143, 255, 0.3);
  padding: 8px 18px;
  border-radius: var(--radius-sm);
  font-size: 0.85rem;
  font-weight: 600;
  cursor: pointer;
  transition: background var(--transition), border-color var(--transition);
}

.btn-copy:hover {
  background: rgba(59, 143, 255, 0.08);
  border-color: var(--accent);
}

/* ========================================
   RULER SECTION
======================================== */
.ruler-section {
  padding: 100px 0;
  background: var(--bg);
}

.ruler-wrap {
  position: relative;
  height: 360px;
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  overflow: hidden;
}

.ruler-h {
  position: absolute;
  top: 0; left: 28px; right: 0;
  height: 28px;
  background: var(--surface-2);
  border-bottom: 1px solid var(--border-2);
  display: flex;
  align-items: center;
  overflow: hidden;
}

.ruler-v {
  position: absolute;
  top: 28px; left: 0; bottom: 0;
  width: 28px;
  background: var(--surface-2);
  border-right: 1px solid var(--border-2);
  display: flex;
  flex-direction: column;
  align-items: center;
  overflow: hidden;
}

.ruler-label-h, .ruler-label-v {
  font-family: var(--font-mono);
  font-size: 0.72rem;
  color: var(--accent-2);
  position: absolute;
  left: 8px;
  top: 50%;
  transform: translateY(-50%);
}

.ruler-label-v {
  top: 8px;
  left: 50%;
  transform: translateX(-50%) rotate(-90deg);
  white-space: nowrap;
}

.ruler-area {
  position: absolute;
  top: 28px; left: 28px; right: 0; bottom: 0;
  background:
    linear-gradient(var(--border) 1px, transparent 1px),
    linear-gradient(90deg, var(--border) 1px, transparent 1px);
  background-size: 40px 40px;
  display: flex;
  align-items: center;
  justify-content: center;
  cursor: crosshair;
}

.ruler-crosshair {
  position: absolute;
  pointer-events: none;
  display: none;
}

.ruler-crosshair::before, .ruler-crosshair::after {
  content: '';
  position: absolute;
  background: var(--accent);
  opacity: 0.6;
}

.ruler-crosshair::before { width: 1px; height: 100vh; left: 0; top: -50vh; }
.ruler-crosshair::after { width: 100vw; height: 1px; top: 0; left: -50vw; }

.ruler-dims {
  font-family: var(--font-mono);
  font-size: 2rem;
  color: var(--text);
  font-weight: 500;
  text-align: center;
}

/* ========================================
   BREAKPOINTS
======================================== */
.breakpoints {
  padding: 100px 0;
  background: var(--bg-2);
}

.bp-grid {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  margin-bottom: 28px;
}

.bp-chip {
  display: flex;
  flex-direction: column;
  gap: 4px;
  background: var(--surface);
  border: 2px solid var(--border);
  border-radius: 10px;
  padding: 14px 18px;
  transition: all var(--transition);
  min-width: 120px;
}

.bp-chip.active {
  border-color: var(--accent);
  background: rgba(59, 143, 255, 0.08);
}

.bp-chip__name {
  font-family: var(--font-display);
  font-weight: 700;
  font-size: 0.9rem;
  color: var(--text);
}

.bp-chip__range {
  font-family: var(--font-mono);
  font-size: 0.72rem;
  color: var(--text-3);
}

.bp-chip.active .bp-chip__name { color: var(--accent); }
.bp-chip.active .bp-chip__range { color: rgba(59, 143, 255, 0.7); }

.bp-current {
  font-family: var(--font-mono);
  font-size: 0.88rem;
  color: var(--text-3);
  padding: 14px 18px;
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius-sm);
  display: inline-block;
}

.bp-current strong { color: var(--accent-2); }

/* ========================================
   COLOR SPACE
======================================== */
.colorspace {
  padding: 100px 0;
  background: var(--bg);
}

.cs-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(240px, 1fr));
  gap: 16px;
}

.cs-card {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 24px;
  display: flex;
  align-items: flex-start;
  gap: 16px;
  transition: border-color var(--transition);
}

.cs-card:hover { border-color: var(--border-2); }

.cs-status {
  width: 12px; height: 12px;
  border-radius: 50%;
  margin-top: 4px;
  flex-shrink: 0;
}

.cs-status.yes { background: var(--success); box-shadow: 0 0 8px var(--success); }
.cs-status.no { background: var(--text-3); }

.cs-info { flex: 1; }
.cs-name { font-weight: 600; color: var(--text); margin-bottom: 4px; }
.cs-desc { font-size: 0.8rem; color: var(--text-3); }
.cs-val { font-family: var(--font-mono); font-size: 0.8rem; color: var(--accent-2); margin-top: 6px; }

/* ========================================
   COMPARISON
======================================== */
.comparison {
  padding: 100px 0;
  background: var(--bg-2);
}

.compare-grid {
  display: flex;
  flex-direction: column;
  gap: 12px;
}

.cmp-row {
  display: flex;
  align-items: center;
  gap: 16px;
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius-sm);
  padding: 16px 20px;
  transition: border-color var(--transition);
}

.cmp-row.yours {
  border-color: var(--accent);
  background: rgba(59, 143, 255, 0.06);
}

.cmp-label {
  font-size: 0.85rem;
  color: var(--text-2);
  width: 200px;
  flex-shrink: 0;
}

.cmp-row.yours .cmp-label { color: var(--accent); font-weight: 600; }

.cmp-bar-wrap {
  flex: 1;
  height: 24px;
  background: var(--bg);
  border-radius: 4px;
  overflow: hidden;
  position: relative;
}

.cmp-bar {
  height: 100%;
  background: linear-gradient(90deg, rgba(59, 143, 255, 0.25), rgba(0, 229, 200, 0.25));
  border-radius: 4px;
  transition: width 1.2s cubic-bezier(0.4, 0, 0.2, 1);
  position: relative;
}

.cmp-row.yours .cmp-bar {
  background: linear-gradient(90deg, var(--accent), var(--accent-2));
}

.cmp-res {
  font-family: var(--font-mono);
  font-size: 0.82rem;
  color: var(--text-3);
  width: 130px;
  text-align: right;
  flex-shrink: 0;
}

.cmp-row.yours .cmp-res { color: var(--accent-2); }

/* ========================================
   HOW IT WORKS
======================================== */
.how {
  padding: 100px 0;
  background: var(--bg);
}

.how-steps {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 2px;
  background: var(--border);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  overflow: hidden;
}

.how-step {
  background: var(--surface);
  padding: 40px;
  display: flex;
  gap: 24px;
  align-items: flex-start;
  transition: background var(--transition);
}

.how-step:hover { background: var(--surface-2); }

.how-num {
  font-family: var(--font-mono);
  font-size: 2.5rem;
  font-weight: 500;
  color: var(--border-2);
  line-height: 1;
  flex-shrink: 0;
}

.how-content h3 {
  font-family: var(--font-display);
  font-size: 1.15rem;
  font-weight: 700;
  margin-bottom: 10px;
  color: var(--text);
}

.how-content p {
  font-size: 0.9rem;
  color: var(--text-2);
  line-height: 1.65;
}

.how-content code {
  font-family: var(--font-mono);
  font-size: 0.82rem;
  color: var(--accent-2);
  background: rgba(0, 229, 200, 0.08);
  padding: 2px 6px;
  border-radius: 4px;
}

/* ========================================
   FAQ
======================================== */
.faq {
  padding: 100px 0;
  background: var(--bg-2);
}

.faq-list {
  display: flex;
  flex-direction: column;
  gap: 4px;
}

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

.faq-item.open { border-color: var(--border-2); }

.faq-q {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 16px;
  padding: 20px 24px;
  cursor: pointer;
  font-weight: 600;
  color: var(--text);
  font-family: var(--font-display);
  font-size: 1rem;
  user-select: none;
}

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

.faq-icon {
  width: 24px; height: 24px;
  border-radius: 6px;
  background: var(--surface-2);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 1.1rem;
  flex-shrink: 0;
  transition: transform var(--transition), background var(--transition);
}

.faq-item.open .faq-icon {
  transform: rotate(45deg);
  background: rgba(59, 143, 255, 0.12);
}

.faq-a {
  max-height: 0;
  overflow: hidden;
  transition: max-height 0.4s ease, padding var(--transition);
  padding: 0 24px;
  color: var(--text-2);
  font-size: 0.92rem;
  line-height: 1.7;
}

.faq-item.open .faq-a {
  max-height: 300px;
  padding: 0 24px 20px;
}

/* ========================================
   FEATURES
======================================== */
.features {
  padding: 100px 0;
  background: var(--bg);
}

.feat-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(240px, 1fr));
  gap: 16px;
}

.feat-card {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 28px;
  transition: border-color var(--transition), transform var(--transition), background var(--transition);
  position: relative;
  overflow: hidden;
}

.feat-card::after {
  content: '';
  position: absolute;
  inset: 0;
  background: radial-gradient(circle at 30% 20%, rgba(59, 143, 255, 0.05), transparent 60%);
  opacity: 0;
  transition: opacity var(--transition);
}

.feat-card:hover {
  border-color: var(--border-2);
  transform: translateY(-4px);
  background: var(--surface-2);
}

.feat-card:hover::after { opacity: 1; }

.feat-icon {
  font-size: 2rem;
  display: block;
  margin-bottom: 16px;
}

.feat-card h3 {
  font-family: var(--font-display);
  font-size: 1rem;
  font-weight: 700;
  margin-bottom: 10px;
  color: var(--text);
}

.feat-card p {
  font-size: 0.87rem;
  color: var(--text-2);
  line-height: 1.65;
}

/* ========================================
   FOOTER
======================================== */
#site-footer {
  background: var(--bg-2);
  border-top: 1px solid var(--border);
  padding: 60px 0 32px;
}

.footer-grid {
  display: grid;
  grid-template-columns: 2fr 1fr 1fr 1fr;
  gap: 48px;
  margin-bottom: 48px;
}

.footer-brand .footer-logo {
  display: flex;
  align-items: center;
  gap: 10px;
  text-decoration: none;
  font-family: var(--font-display);
  font-weight: 700;
  font-size: 1.1rem;
  color: var(--text);
  margin-bottom: 14px;
}

.footer-brand p {
  font-size: 0.87rem;
  color: var(--text-3);
  line-height: 1.65;
  max-width: 260px;
  margin-bottom: 20px;
}

.footer-tech {
  display: flex;
  gap: 8px;
  flex-wrap: wrap;
}

.ft-badge {
  font-family: var(--font-mono);
  font-size: 0.68rem;
  color: var(--text-3);
  border: 1px solid var(--border);
  padding: 4px 10px;
  border-radius: 100px;
}

.footer-col h4 {
  font-family: var(--font-display);
  font-size: 0.88rem;
  font-weight: 700;
  color: var(--text);
  margin-bottom: 16px;
  letter-spacing: 0.04em;
}

.footer-col ul {
  list-style: none;
  display: flex;
  flex-direction: column;
  gap: 10px;
}

.footer-col ul li a {
  color: var(--text-3);
  text-decoration: none;
  font-size: 0.87rem;
  transition: color var(--transition);
}

.footer-col ul li a:hover { color: var(--accent); }

.footer-bottom {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 16px;
  padding-top: 28px;
  border-top: 1px solid var(--border);
  flex-wrap: wrap;
}

.footer-bottom p {
  font-size: 0.82rem;
  color: var(--text-3);
}

.footer-bottom-links {
  display: flex;
  gap: 20px;
}

.footer-bottom-links a {
  font-size: 0.82rem;
  color: var(--text-3);
  text-decoration: none;
  transition: color var(--transition);
}

.footer-bottom-links a:hover { color: var(--accent); }

/* ========================================
   MEDIA QUERIES
======================================== */
@media (max-width: 900px) {
  .detector-grid {
    grid-template-columns: 1fr;
  }
  .det-card--primary,
  .det-metrics,
  .det-card--device,
  .det-card--physical {
    grid-column: 1;
    grid-row: auto;
  }
  .det-metrics { grid-template-columns: 1fr 1fr; }
  .how-steps { grid-template-columns: 1fr; }
  .footer-grid { grid-template-columns: 1fr 1fr; }
  .hero-quick-stats { gap: 20px; padding: 16px 24px; }
}

@media (max-width: 640px) {
  .header-nav { display: none; }
  .hamburger { display: flex; }
  .hero-quick-stats { flex-direction: column; gap: 16px; }
  .qs-divider { width: 80px; height: 1px; }
  .det-metrics { grid-template-columns: 1fr; }
  .physical-results { grid-template-columns: 1fr 1fr; }
  .footer-grid { grid-template-columns: 1fr; }
  .footer-brand p { max-width: 100%; }
  .how-step { padding: 24px 20px; }
  .container { padding: 0 16px; }
}

@media (max-width: 480px) {
  .physical-results { grid-template-columns: 1fr; }
  .physical-input-row { flex-direction: column; align-items: flex-start; }
  .hero-cta { flex-direction: column; }
  .btn-primary, .btn-ghost { width: 100%; text-align: center; justify-content: center; }
}

/* Scrollbar */
::-webkit-scrollbar { width: 6px; }
::-webkit-scrollbar-track { background: var(--bg); }
::-webkit-scrollbar-thumb { background: var(--surface-2); border-radius: 3px; }
::-webkit-scrollbar-thumb:hover { background: var(--border-2); }