/* ============================================
   Taika3D Best Practices – Stylesheet
   Brand Colors from taika3d.com:
     Primary: #022C99 (deep blue)
     Secondary: #9B3AFF (vivid purple)
     Accent: #61CE70 (green)
     Text: #7A7A7A
     Magenta: #DA1C5C
     Orange: #EB6835
     Yellow: #F8D61D
     Teal: #28D087
     Peach: #FFBC7D
   Font: Inter Tight
   ============================================ */

/* --- Reset & Base --- */
*, *::before, *::after {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}

:root {
  --color-primary: #022C99;
  --color-primary-dark: #011d66;
  --color-primary-light: #eef1fb;
  --color-secondary: #9B3AFF;
  --color-secondary-light: #f3eaff;
  --color-accent: #61CE70;
  --color-accent-light: #e8f8ea;
  --color-dark: #1a1a2e;
  --color-dark-light: #2d2d44;
  --color-text: #4a4a5a;
  --color-text-light: #7A7A7A;
  --color-bg: #ffffff;
  --color-bg-alt: #f6f7fb;
  --color-danger: #DA1C5C;
  --color-danger-light: #fdf0f4;
  --color-warning: #EB6835;
  --color-yellow: #F8D61D;
  --color-peach: #FFBC7D;
  --color-teal: #28D087;
  --color-border: #e8e8ee;
  --font-main: 'Inter Tight', -apple-system, BlinkMacSystemFont, 'Helvetica Neue', Arial, sans-serif;
  --radius: 14px;
  --radius-sm: 8px;
  --shadow: 0 2px 20px rgba(2,44,153,0.06);
  --shadow-hover: 0 8px 30px rgba(2,44,153,0.12);
  --transition: 0.3s ease;
  --container-max: 1200px;
}

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

body {
  font-family: var(--font-main);
  color: var(--color-text);
  background: var(--color-bg);
  line-height: 1.65;
  -webkit-font-smoothing: antialiased;
}

a {
  color: var(--color-primary);
  text-decoration: none;
  transition: color var(--transition);
}
a:hover {
  color: var(--color-primary-dark);
}

img, svg {
  max-width: 100%;
  height: auto;
}

/* --- Container --- */
.container {
  max-width: var(--container-max);
  margin: 0 auto;
  padding: 0 24px;
}

/* ==================
   HEADER
   ================== */
.site-header {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  z-index: 1000;
  background: rgba(255,255,255,0.95);
  backdrop-filter: blur(10px);
  border-bottom: 1px solid var(--color-border);
  transition: box-shadow var(--transition);
}
.site-header.scrolled {
  box-shadow: 0 2px 12px rgba(0,0,0,0.08);
}

.notification-bar {
  position: fixed;
  top: 64px;
  left: 0;
  right: 0;
  z-index: 999;
  background: var(--color-orange, #EB6835);
  color: #fff;
  padding: 0.6rem 0;
  text-align: center;
  font-size: 0.9rem;
  font-weight: 500;
  line-height: 1.4;
}
.notification-bar p {
  margin: 0;
}
.notification-bar time {
  font-weight: 700;
  opacity: 0.9;
}
.notification-bar .resolved-message {
  margin-top: 0.4rem;
  font-weight: 700;
}
.notification-bar.resolved {
  background: var(--color-accent, #61CE70);
}

.header-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 64px;
}

.logo {
  display: flex;
  align-items: center;
}
.logo-img {
  height: 36px;
  width: auto;
}

.nav-list {
  display: flex;
  list-style: none;
  gap: 8px;
}
.nav-list a {
  display: block;
  padding: 8px 16px;
  font-size: 0.9rem;
  font-weight: 500;
  color: var(--color-dark);
  border-radius: var(--radius-sm);
  transition: background var(--transition), color var(--transition);
}
.nav-list a:hover,
.nav-list a.active {
  background: var(--color-primary-light);
  color: var(--color-primary);
}

/* Active scanning mode indicator in navbar */
.nav-mode-indicator {
  background: var(--color-primary) !important;
  color: #fff !important;
  border-radius: var(--radius-sm);
  font-weight: 600 !important;
  font-size: 0.8rem !important;
  letter-spacing: 0.02em;
}
.nav-mode-indicator:hover {
  background: var(--color-primary-dark) !important;
  color: #fff !important;
}
.nav-divider {
  width: 1px;
  align-self: stretch;
  margin: 8px 4px;
  background: var(--color-border);
}

/* Mobile nav toggle */
.nav-toggle {
  display: none;
  flex-direction: column;
  gap: 5px;
  background: none;
  border: none;
  cursor: pointer;
  padding: 6px;
}
.nav-toggle span {
  display: block;
  width: 24px;
  height: 2px;
  background: var(--color-dark);
  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);
}

/* ==================
   HERO
   ================== */
.hero {
  display: flex;
  align-items: center;
  justify-content: space-between;
  min-height: 85vh;
  padding: 140px 24px 60px;
  max-width: var(--container-max);
  margin: 0 auto;
  gap: 40px;
}

.hero-content {
  flex: 1;
  padding: 0;
  max-width: 520px;
}

.hero h1 {
  font-size: 3.2rem;
  font-weight: 700;
  color: var(--color-dark);
  line-height: 1.15;
  margin-bottom: 20px;
}
.hero .highlight {
  background: linear-gradient(135deg, var(--color-primary), var(--color-secondary));
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

.hero-sub {
  font-size: 1.15rem;
  color: var(--color-text-light);
  margin-bottom: 32px;
  line-height: 1.6;
}

.hero-actions {
  display: flex;
  align-items: center;
  gap: 16px;
}

.hero-actions .mode-label {
  margin-bottom: 0;
}

.hero-visual {
  flex: 1;
  display: flex;
  justify-content: center;
  max-width: 460px;
}
.hero-svg {
  width: 100%;
}
.scan-animation {
  position: relative;
  width: 100%;
}

/* Buttons */
.btn {
  display: inline-block;
  padding: 14px 32px;
  font-size: 1rem;
  font-weight: 600;
  border-radius: var(--radius);
  border: none;
  cursor: pointer;
  transition: background var(--transition), transform var(--transition), box-shadow var(--transition);
}
.btn-primary {
  background: linear-gradient(135deg, var(--color-primary), var(--color-secondary));
  color: #fff;
}
.btn-primary:hover {
  background: linear-gradient(135deg, var(--color-primary-dark), #7a1fd4);
  color: #fff;
  transform: translateY(-2px);
  box-shadow: 0 8px 24px rgba(2,44,153,0.25);
}

/* ==================
   SECTIONS
   ================== */
.section {
  padding: 80px 0;
  scroll-margin-top: 110px;
}
.section-alt {
  background: var(--color-bg-alt);
}

.section-header {
  text-align: center;
  margin-bottom: 56px;
}
.section-number {
  display: inline-block;
  font-size: 0.85rem;
  font-weight: 700;
  color: #fff;
  background: linear-gradient(135deg, var(--color-primary), var(--color-secondary));
  padding: 5px 16px;
  border-radius: 20px;
  margin-bottom: 16px;
  letter-spacing: 1px;
}
.section-header h2 {
  font-size: 2.2rem;
  font-weight: 700;
  color: var(--color-dark);
  margin-bottom: 12px;
}
.section-intro {
  font-size: 1.05rem;
  color: var(--color-text-light);
  max-width: 600px;
  margin: 0 auto;
}

/* ==================
   CARDS (General Guidelines)
   ================== */
.cards-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(300px, 1fr));
  gap: 24px;
}

.card {
  background: #fff;
  border: 1px solid var(--color-border);
  border-radius: var(--radius);
  padding: 28px;
  transition: transform var(--transition), box-shadow var(--transition);
}
.card:hover {
  transform: translateY(-4px);
  box-shadow: var(--shadow-hover);
}

.card-icon {
  width: 52px;
  height: 52px;
  margin-bottom: 16px;
}
.card-icon svg {
  width: 100%;
  height: 100%;
}

.card h3 {
  font-size: 1.15rem;
  font-weight: 600;
  color: var(--color-dark);
  margin-bottom: 8px;
}
.card p {
  font-size: 0.95rem;
  color: var(--color-text);
  line-height: 1.6;
}

.card-tip {
  margin-top: 14px;
  padding: 12px 14px;
  border-radius: var(--radius-sm);
  font-size: 0.88rem;
  line-height: 1.5;
}
.card-tip.warning {
  background: linear-gradient(135deg, #fff8e1, #fff3cc);
  border-left: 3px solid var(--color-warning);
  color: #795600;
}

.card-links {
  margin-top: 16px;
  display: flex;
  flex-direction: column;
  gap: 6px;
}
.card-links a {
  font-size: 0.9rem;
  font-weight: 500;
}

/* Card wide variant – spans full row */
.card-wide {
  grid-column: 1 / -1;
}

/* Depth frame comparison */
.depth-comparison {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 16px;
  margin-top: 16px;
}
.depth-example {
  border-radius: var(--radius-sm);
  overflow: hidden;
  border: 2px solid var(--color-border);
  position: relative;
}
.depth-example img {
  width: 100%;
  display: block;
}
.depth-example.depth-good {
  border-color: var(--color-accent);
}
.depth-example.depth-bad {
  border-color: var(--color-danger);
}
.depth-label {
  display: block;
  text-align: center;
  padding: 6px 0;
  font-size: 0.85rem;
  font-weight: 600;
}
.depth-label-good {
  background: var(--color-accent-light);
  color: #2c9b49;
}
.depth-label-bad {
  background: var(--color-danger-light);
  color: var(--color-danger);
}
.depth-tips-list {
  margin: 6px 0 0 16px;
  padding: 0;
  list-style: disc;
}
.depth-tips-list li {
  margin-bottom: 4px;
}
.depth-tips-list a {
  color: inherit;
  text-decoration: underline;
}

/* Bounding box illustration */
.boundingbox-illustration {
  margin-top: 16px;
  border-radius: var(--radius-sm);
  overflow: hidden;
  border: 2px solid var(--color-border);
}
.boundingbox-illustration img {
  width: 100%;
  display: block;
}

/* Scanner prompts reference */
.scanner-prompts-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(280px, 1fr));
  gap: 12px;
  margin-top: 16px;
}
.prompt-item {
  padding: 14px 16px;
  border-radius: var(--radius-sm);
  font-size: 0.9rem;
  line-height: 1.5;
  border-left: 3px solid;
}
.prompt-item strong {
  display: block;
  font-size: 0.88rem;
  margin-bottom: 4px;
}
.prompt-item p {
  font-size: 0.85rem;
  margin: 0;
  color: var(--color-text);
}
.prompt-danger {
  background: var(--color-danger-light);
  border-left-color: var(--color-danger);
}
.prompt-warning {
  background: linear-gradient(135deg, #fff8e1, #fff3cc);
  border-left-color: var(--color-warning);
}
.prompt-info {
  background: var(--color-primary-light);
  border-left-color: var(--color-primary);
}
.prompt-item a {
  color: var(--color-primary);
  text-decoration: underline;
}

/* ==================
   INFO PANELS (Preparation)
   ================== */
.info-panels {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(300px, 1fr));
  gap: 24px;
}

.info-panel {
  background: #fff;
  border-radius: var(--radius);
  padding: 32px;
  border: 1px solid var(--color-border);
  text-align: center;
  transition: transform var(--transition), box-shadow var(--transition);
}
.info-panel:hover {
  transform: translateY(-4px);
  box-shadow: var(--shadow-hover);
}

.info-panel.recommended {
  border-top: 3px solid var(--color-accent);
}
.info-panel.not-recommended {
  border-top: 3px solid var(--color-danger);
}

.panel-icon {
  width: 64px;
  height: 64px;
  margin: 0 auto 16px;
}
.panel-icon svg {
  width: 100%;
  height: 100%;
}

.info-panel h3 {
  font-size: 1.1rem;
  font-weight: 600;
  color: var(--color-dark);
  margin-bottom: 10px;
}
.info-panel p {
  font-size: 0.95rem;
  color: var(--color-text);
  line-height: 1.6;
}

/* ==================
   POSITIONS (Positioning)
   ================== */
.positions-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(280px, 1fr));
  gap: 28px;
}

.position-card {
  background: #fff;
  border: 1px solid var(--color-border);
  border-radius: var(--radius);
  overflow: hidden;
  transition: transform var(--transition), box-shadow var(--transition);
  position: relative;
}
.position-card:hover {
  transform: translateY(-4px);
  box-shadow: var(--shadow-hover);
}

.position-card.recommended {
  border-top: 3px solid var(--color-accent);
}
.position-card.not-recommended {
  border-top: 3px solid var(--color-danger);
}

.position-badge {
  position: absolute;
  top: 16px;
  right: 16px;
  z-index: 2;
  background: linear-gradient(135deg, var(--color-accent), var(--color-teal));
  color: #fff;
  font-size: 0.75rem;
  font-weight: 600;
  padding: 4px 12px;
  border-radius: 20px;
  text-transform: uppercase;
  letter-spacing: 0.5px;
}
.position-badge.badge-warning {
  background: var(--color-danger);
}

.position-visual {
  padding: 20px;
  display: flex;
  justify-content: center;
  background:
    radial-gradient(circle at top left, rgba(155,58,255,0.09), transparent 42%),
    radial-gradient(circle at bottom right, rgba(2,44,153,0.08), transparent 46%),
    linear-gradient(180deg, #f9faff 0%, #f2f4fb 100%);
  border-bottom: 1px solid var(--color-border);
}
.position-visual img,
.position-visual svg {
  width: 100%;
  max-width: 260px;
  height: auto;
  filter: drop-shadow(0 10px 18px rgba(2,44,153,0.08));
  border-radius: 12px;
}

.position-card h3 {
  font-size: 1.1rem;
  font-weight: 600;
  color: var(--color-dark);
  padding: 16px 20px 4px;
}
.position-card p {
  font-size: 0.92rem;
  color: var(--color-text);
  padding: 0 20px 20px;
  line-height: 1.5;
}

/* ==================
   TECHNIQUES (Scanning)
   ================== */
.technique-block {
  display: flex;
  gap: 40px;
  align-items: flex-start;
  background: #fff;
  border: 1px solid var(--color-border);
  border-radius: var(--radius);
  padding: 36px;
  margin-bottom: 28px;
  transition: box-shadow var(--transition);
}
.technique-block:hover {
  box-shadow: var(--shadow);
}

.technique-block.technique-not-recommended {
  border-left: 4px solid var(--color-danger);
}
.technique-block:not(.technique-not-recommended) {
  border-left: 4px solid var(--color-accent);
}

.technique-content {
  flex: 1;
}

/* Step-card grid layout for per-step visuals */
.technique-block-steps {
  flex-direction: column;
}
.technique-content-full {
  flex: none;
  width: 100%;
}
.technique-steps-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 24px;
  margin-top: 20px;
}
.technique-step-card {
  background: linear-gradient(180deg, #f9fbff 0%, #f1f4fb 100%);
  border: 1px solid var(--color-border);
  border-radius: 16px;
  overflow: hidden;
  transition: box-shadow var(--transition);
}
.technique-step-card:hover {
  box-shadow: var(--shadow);
}
.technique-step-card-wide {
  grid-column: 1 / -1;
  max-width: 50%;
  justify-self: center;
}
.technique-step-visual {
  display: flex;
  justify-content: center;
  padding: 12px 12px 0;
}
.technique-step-visual svg {
  width: 100%;
  max-width: 200px;
  display: block;
}
.technique-step-info {
  display: flex;
  gap: 12px;
  padding: 16px;
  align-items: flex-start;
}
.technique-step-info strong {
  display: block;
  font-size: 0.95rem;
  color: var(--color-dark);
  margin-bottom: 2px;
}
.technique-step-info p {
  font-size: 0.85rem;
  color: var(--color-text-light);
  margin: 0;
}

.technique-visual {
  flex: 0 0 300px;
  padding: 10px;
  border-radius: 24px;
  background:
    radial-gradient(circle at top left, rgba(97,206,112,0.08), transparent 38%),
    radial-gradient(circle at bottom right, rgba(2,44,153,0.07), transparent 44%),
    linear-gradient(180deg, #f9fbff 0%, #f1f4fb 100%);
  border: 1px solid var(--color-border);
}
.technique-visual svg {
  width: 100%;
  display: block;
}

.technique-badge {
  display: inline-block;
  font-size: 0.75rem;
  font-weight: 600;
  padding: 4px 14px;
  border-radius: 20px;
  text-transform: uppercase;
  letter-spacing: 0.5px;
  background: linear-gradient(135deg, var(--color-accent), var(--color-teal));
  color: #fff;
  margin-bottom: 12px;
}
.technique-badge.badge-warning {
  background: var(--color-danger);
}

.technique-content h3 {
  font-size: 1.3rem;
  font-weight: 600;
  color: var(--color-dark);
  margin-bottom: 20px;
}

.technique-steps {
  list-style: none;
  counter-reset: step;
}
.technique-steps li {
  display: flex;
  gap: 14px;
  margin-bottom: 16px;
  align-items: flex-start;
}
.step-num {
  display: flex;
  align-items: center;
  justify-content: center;
  width: 32px;
  height: 32px;
  min-width: 32px;
  border-radius: 50%;
  background: linear-gradient(135deg, var(--color-primary), var(--color-secondary));
  color: #fff;
  font-weight: 700;
  font-size: 0.85rem;
}
.technique-not-recommended .step-num {
  background: var(--color-danger);
  color: #fff;
  opacity: 0.7;
}

.technique-steps strong {
  display: block;
  font-size: 0.95rem;
  color: var(--color-dark);
  margin-bottom: 2px;
}
.technique-steps p {
  font-size: 0.9rem;
  color: var(--color-text-light);
}

/* ==================
   TECHNOLOGY OVERVIEW
   ================== */
.tech-sub-heading {
  font-size: 1.3rem;
  font-weight: 700;
  color: var(--dark);
  margin-bottom: 1.2rem;
}

.sensors-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(200px, 1fr));
  gap: 24px;
}

.sensor-card {
  background: #fff;
  border: 1px solid var(--color-border);
  border-radius: var(--radius);
  padding: 28px;
  text-align: center;
  transition: transform var(--transition), box-shadow var(--transition);
}
.sensor-card:hover {
  transform: translateY(-4px);
  box-shadow: var(--shadow-hover);
}

.sensor-icon {
  width: 80px;
  margin: 0 auto 14px;
}
.sensor-icon svg {
  width: 100%;
}

.sensor-card h4 {
  font-size: 1.1rem;
  font-weight: 600;
  color: var(--color-dark);
  margin-bottom: 4px;
}
.sensor-id {
  font-size: 0.85rem;
  color: var(--color-text-light);
  font-weight: 500;
}

/* ==================
   ACCORDION (Troubleshooting)
   ================== */
.accordion {
  max-width: 780px;
  margin: 0 auto;
}

.accordion-item {
  border: 1px solid var(--color-border);
  border-radius: var(--radius-sm);
  margin-bottom: 10px;
  overflow: hidden;
  background: #fff;
  transition: box-shadow var(--transition);
}
.accordion-item:hover {
  box-shadow: var(--shadow);
}

.accordion-header {
  width: 100%;
  display: flex;
  align-items: center;
  gap: 12px;
  padding: 18px 20px;
  background: none;
  border: none;
  cursor: pointer;
  font-size: 1rem;
  font-weight: 500;
  color: var(--color-dark);
  text-align: left;
  font-family: var(--font-main);
  transition: background var(--transition);
}
.accordion-header:hover {
  background: var(--color-bg-alt);
}

.accordion-icon {
  width: 22px;
  height: 22px;
  flex-shrink: 0;
  color: var(--color-secondary);
}
.accordion-icon svg {
  width: 100%;
  height: 100%;
}

.accordion-header span:nth-child(2) {
  flex: 1;
}

.accordion-arrow {
  width: 20px;
  height: 20px;
  flex-shrink: 0;
  color: var(--color-text-light);
  transition: transform var(--transition);
}
.accordion-arrow svg {
  width: 100%;
  height: 100%;
}
.accordion-header[aria-expanded="true"] .accordion-arrow {
  transform: rotate(180deg);
}

.accordion-body {
  max-height: 0;
  overflow: hidden;
  transition: max-height 0.35s ease, padding 0.35s ease;
}
.accordion-body p {
  padding: 0 20px 18px 54px;
  font-size: 0.95rem;
  color: var(--color-text);
  line-height: 1.6;
}
.accordion-body a {
  font-weight: 500;
}

.accordion-item.open .accordion-body {
  max-height: 300px;
}

/* ==================
   FOOTER
   ================== */
/* Device Compatibility */
.device-compat {
  margin-top: 3rem;
}
.device-compat > h3 {
  font-size: 1.5rem;
  color: var(--color-dark);
  margin-bottom: 0.5rem;
}
.compat-intro {
  color: var(--color-text);
  margin-bottom: 2rem;
}
.compat-group {
  margin-bottom: 2rem;
}
.compat-group h4 {
  font-size: 1.1rem;
  color: var(--color-primary);
  margin-bottom: 0.75rem;
  padding-bottom: 0.5rem;
  border-bottom: 2px solid var(--color-primary);
  display: inline-block;
}
.compat-table-wrap {
  overflow-x: auto;
  margin-bottom: 1rem;
}
.compat-table {
  width: 100%;
  border-collapse: collapse;
  font-size: 0.9rem;
}
.compat-table th {
  background: var(--color-primary);
  color: #fff;
  padding: 0.6rem 0.8rem;
  text-align: left;
  font-weight: 600;
  white-space: nowrap;
}
.compat-table td {
  padding: 0.5rem 0.8rem;
  border-bottom: 1px solid #eee;
  white-space: nowrap;
}
.compat-table tbody tr:hover {
  background: rgba(2, 44, 153, 0.03);
}
.compat-note {
  font-size: 0.85rem;
  color: var(--color-text);
  margin-top: 0.5rem;
}
.compat-note a {
  color: var(--color-primary);
}
.technique-desc {
  color: var(--color-text);
  margin-bottom: 1rem;
  line-height: 1.6;
}

.site-footer {
  background: linear-gradient(135deg, #0a0a1c, var(--color-dark));
  color: rgba(255,255,255,0.7);
  padding: 48px 0 32px;
}

.footer-inner {
  display: grid;
  grid-template-columns: 2fr 1fr 1fr 1fr;
  gap: 32px;
}

.footer-brand p {
  margin-top: 12px;
  font-size: 0.85rem;
}

.footer-logo {
  height: 32px;
  width: auto;
}

.footer-links h4 {
  color: #fff;
  font-size: 0.9rem;
  font-weight: 600;
  margin-bottom: 12px;
  text-transform: uppercase;
  letter-spacing: 0.5px;
}
.footer-links ul {
  list-style: none;
}
.footer-links li {
  margin-bottom: 8px;
}
.footer-links a {
  color: rgba(255,255,255,0.6);
  font-size: 0.9rem;
  transition: color var(--transition);
}
.footer-links a:hover {
  color: #fff;
}

/* ==================
   RESPONSIVE
   ================== */
@media (max-width: 900px) {
  .hero {
    flex-direction: column;
    text-align: center;
    padding-top: 90px;
    min-height: auto;
  }
  .hero-content {
    max-width: 100%;
  }
  .hero h1 {
    font-size: 2.4rem;
  }
  .hero-visual {
    max-width: 340px;
  }

  .technique-block {
    flex-direction: column;
  }
  .technique-steps-grid {
    grid-template-columns: repeat(2, 1fr);
  }
  .technique-step-card-wide {
    max-width: 100%;
  }
  .technique-visual {
    flex: none;
    width: 100%;
    max-width: 280px;
    margin: 0 auto;
  }

  .footer-inner {
    grid-template-columns: 1fr 1fr;
    gap: 24px;
  }
}

@media (max-width: 640px) {
  .nav-toggle {
    display: flex;
  }
  .nav-list {
    display: none;
    position: absolute;
    top: 64px;
    left: 0;
    right: 0;
    background: #fff;
    flex-direction: column;
    padding: 16px 24px;
    border-bottom: 1px solid var(--color-border);
    box-shadow: 0 4px 16px rgba(0,0,0,0.08);
  }
  .nav-list.open {
    display: flex;
  }
  .nav-list .nav-divider {
    width: auto;
    height: 1px;
    margin: 4px 0;
    align-self: auto;
  }

  .hero h1 {
    font-size: 2rem;
  }
  .section-header h2 {
    font-size: 1.7rem;
  }
  .section {
    padding: 56px 0;
  }
  .cards-grid,
  .info-panels,
  .positions-grid {
    grid-template-columns: 1fr;
  }
  .depth-comparison {
    grid-template-columns: 1fr;
  }
  .sensors-grid {
    grid-template-columns: repeat(2, 1fr);
  }

  .technique-block {
    padding: 24px;
  }
  .technique-steps-grid {
    grid-template-columns: 1fr;
  }
  .technique-step-card-wide {
    max-width: 100%;
  }

  .footer-inner {
    grid-template-columns: 1fr;
    text-align: center;
  }
  .mode-toggle {
    flex-direction: column;
    width: 100%;
  }
  .mode-btn {
    justify-content: center;
  }
}

/* --- Animations --- */
@keyframes fadeInUp {
  from {
    opacity: 0;
    transform: translateY(24px);
  }
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

.animate-in {
  animation: fadeInUp 0.5s ease forwards;
  opacity: 0;
}

/* Small inline images */
.inline-img-small {
  display: block;
  max-width: 220px;
  margin-top: 0.5rem;
  border-radius: 8px;
}

/* Scan line animation */
.scan-beam {
  opacity: 0.7;
}

/* ==================
   MODE SELECTOR
   ================== */
.mode-selector-section {
  padding: 32px 0 0;
  text-align: center;
}
.mode-label {
  font-size: 0.95rem;
  color: var(--color-text-light);
  margin-bottom: 14px;
  font-weight: 500;
}
.mode-toggle {
  display: inline-flex;
  background: var(--color-bg-alt);
  border: 1px solid var(--color-border);
  border-radius: var(--radius);
  padding: 4px;
  gap: 4px;
}
.mode-btn {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 12px 28px;
  font-size: 0.95rem;
  font-weight: 600;
  font-family: var(--font-main);
  color: var(--color-text);
  background: transparent;
  border: none;
  border-radius: calc(var(--radius) - 4px);
  cursor: pointer;
  transition: background var(--transition), color var(--transition), box-shadow var(--transition);
}
.mode-btn svg {
  width: 22px;
  height: 22px;
}
.mode-btn:hover {
  background: rgba(255,255,255,0.7);
  color: var(--color-primary);
}
.mode-btn.active {
  background: linear-gradient(135deg, var(--color-primary), var(--color-secondary));
  color: #fff;
  box-shadow: 0 2px 12px rgba(2,44,153,0.18);
}

/* Mode visibility */
body.mode-sensor .truedepth-only {
  display: none !important;
}
body.mode-truedepth .sensor-only {
  display: none !important;
}