/* ============================================================
   HorizonDrill — Precision Engineering Design System
   Warm + Copper Aesthetic
   ============================================================ */

/* --- CSS Variables --- */
:root {
  --bg-base: #f9f8f6;
  --bg-surface: #f2efeb;
  --bg-elevated: #e8e4de;
  --bg-glass: rgba(249, 248, 246, 0.92);
  --border-subtle: rgba(0, 0, 0, 0.07);
  --border-medium: rgba(0, 0, 0, 0.11);
  --border-active: rgba(184, 115, 51, 0.45);
  --text-primary: #1f1b15;
  --text-secondary: #6b6358;
  --text-tertiary: #9b9489;
  --accent: #b87333;
  --accent-glow: rgba(184, 115, 51, 0.20);
  --accent-subtle: rgba(184, 115, 51, 0.07);
  --font-mono: 'JetBrains Mono', 'SF Mono', 'Cascadia Code', monospace;
  --font-sans: 'DM Sans', 'Inter', -apple-system, sans-serif;
  --radius: 2px;
  --transition: 220ms cubic-bezier(0.33, 1, 0.68, 1);
}

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

html {
  scroll-behavior: smooth;
  background: var(--bg-base);
  color: var(--text-primary);
  font-family: var(--font-sans);
  font-size: 16px;
  line-height: 1.6;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

body {
  background: var(--bg-base);
  min-height: 100vh;
  overflow-x: hidden;
}

/* --- Dot Grid Background --- */
.dot-grid {
  position: fixed;
  inset: 0;
  pointer-events: none;
  z-index: 0;
  opacity: 0.30;
  background-image: radial-gradient(
    circle at 1px 1px,
    rgba(0, 0, 0, 0.06) 1px,
    transparent 1px
  );
  background-size: 32px 32px;
}

/* --- Typography --- */
h1, h2, h3, h4, h5, h6 {
  font-weight: 500;
  line-height: 1.2;
  letter-spacing: -0.02em;
}

.display {
  font-family: var(--font-mono);
  font-weight: 400;
  letter-spacing: -0.03em;
}

.mono {
  font-family: var(--font-mono);
}

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

.text-secondary {
  color: var(--text-secondary);
}

/* --- Navigation --- */
.nav {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  z-index: 100;
  height: 56px;
  background: rgba(249, 248, 246, 0.92);
  backdrop-filter: blur(16px);
  -webkit-backdrop-filter: blur(16px);
  border-bottom: 1px solid var(--border-subtle);
  display: flex;
  align-items: center;
}

.nav-inner {
  width: 100%;
  max-width: 1200px;
  margin: 0 auto;
  padding: 0 40px;
  display: flex;
  justify-content: space-between;
  align-items: center;
}

.nav-brand {
  font-family: var(--font-mono);
  font-size: 1.25rem;
  font-weight: 500;
  color: var(--text-primary);
  text-decoration: none;
  letter-spacing: -0.02em;
  display: flex;
  align-items: center;
  gap: 0;
}

.nav-brand span {
  color: var(--accent);
}

.nav-links {
  display: flex;
  align-items: center;
  gap: 32px;
}

.nav-link {
  color: var(--text-secondary);
  text-decoration: none;
  font-size: 0.8125rem;
  font-weight: 450;
  letter-spacing: 0.02em;
  text-transform: uppercase;
  transition: color var(--transition);
  position: relative;
}

.nav-link::after {
  content: '';
  position: absolute;
  bottom: -4px;
  left: 0;
  right: 0;
  height: 1px;
  background: var(--accent);
  transform: scaleX(0);
  transition: transform var(--transition);
}

.nav-link:hover {
  color: var(--text-primary);
}

.nav-link:hover::after {
  transform: scaleX(1);
}

.nav-cta {
  padding: 8px 20px;
  border: 1px solid var(--accent);
  color: var(--accent);
  background: transparent;
  font-family: var(--font-mono);
  font-size: 0.75rem;
  letter-spacing: 0.04em;
  text-transform: uppercase;
  cursor: pointer;
  transition: all var(--transition);
  text-decoration: none;
}

.nav-cta:hover {
  background: var(--accent);
  color: #fff;
}

/* --- Language Switcher --- */
.lang-switcher {
  display: flex;
  gap: 2px;
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius);
  overflow: hidden;
}

.lang-btn {
  padding: 4px 10px;
  background: transparent;
  border: none;
  color: var(--text-secondary);
  font-family: var(--font-mono);
  font-size: 0.6875rem;
  cursor: pointer;
  transition: all var(--transition);
  letter-spacing: 0.04em;
}

.lang-btn:hover {
  color: var(--text-primary);
  background: rgba(0, 0, 0, 0.04);
}

.lang-btn.active {
  background: var(--accent);
  color: #fff;
}

/* --- Layout --- */
.section {
  position: relative;
  z-index: 1;
  padding: 100px 40px;
}

.section-inner {
  max-width: 1200px;
  margin: 0 auto;
}

.section-header {
  margin-bottom: 64px;
}

.section-label {
  font-family: var(--font-mono);
  font-size: 0.6875rem;
  color: var(--accent);
  text-transform: uppercase;
  letter-spacing: 0.08em;
  margin-bottom: 16px;
}

.section-title {
  font-family: var(--font-mono);
  font-size: 2.5rem;
  font-weight: 400;
  color: var(--text-primary);
  letter-spacing: -0.03em;
  margin-bottom: 12px;
}

.section-desc {
  color: var(--text-secondary);
  font-size: 1rem;
  max-width: 560px;
  line-height: 1.7;
}

/* --- Hero --- */
.hero {
  position: relative;
  z-index: 1;
  min-height: 100vh;
  display: flex;
  align-items: center;
  justify-content: center;
  padding: 0 40px;
  overflow: hidden;
}

.hero::before {
  content: '';
  position: absolute;
  inset: 0;
  background:
    radial-gradient(ellipse at 30% 50%, rgba(184, 115, 51, 0.06) 0%, transparent 60%),
    radial-gradient(ellipse at 70% 30%, rgba(184, 115, 51, 0.03) 0%, transparent 50%);
  pointer-events: none;
}

.hero-geo {
  position: absolute;
  inset: 0;
  pointer-events: none;
  opacity: 0.15;
}

.hero-geo-line {
  position: absolute;
  background: rgba(0, 0, 0, 0.05);
}

.hero-geo-line.h1 {
  top: 20%;
  left: 0;
  right: 0;
  height: 1px;
}
.hero-geo-line.h2 {
  top: 60%;
  left: 0;
  right: 0;
  height: 1px;
}
.hero-geo-line.v1 {
  left: 25%;
  top: 0;
  bottom: 0;
  width: 1px;
}
.hero-geo-line.v2 {
  left: 65%;
  top: 0;
  bottom: 0;
  width: 1px;
}

.hero-content {
  position: relative;
  z-index: 2;
  text-align: left;
  max-width: 800px;
}

.hero-tag {
  display: inline-block;
  font-family: var(--font-mono);
  font-size: 0.6875rem;
  color: var(--accent);
  letter-spacing: 0.1em;
  text-transform: uppercase;
  padding: 6px 14px;
  border: 1px solid rgba(184, 115, 51, 0.30);
  margin-bottom: 32px;
}

.hero-title {
  font-family: var(--font-mono);
  font-size: clamp(3rem, 6vw, 5rem);
  font-weight: 350;
  line-height: 1.1;
  letter-spacing: -0.04em;
  color: var(--text-primary);
  margin-bottom: 24px;
}

.hero-title em {
  font-style: normal;
  color: var(--accent);
}

.hero-desc {
  color: var(--text-secondary);
  font-size: 1.125rem;
  max-width: 480px;
  line-height: 1.7;
  margin-bottom: 40px;
}

.hero-actions {
  display: flex;
  gap: 16px;
  flex-wrap: wrap;
}

/* --- Buttons --- */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  padding: 12px 28px;
  font-family: var(--font-mono);
  font-size: 0.8125rem;
  font-weight: 450;
  letter-spacing: 0.04em;
  text-transform: uppercase;
  text-decoration: none;
  cursor: pointer;
  transition: all var(--transition);
  border: 1px solid transparent;
  position: relative;
  overflow: hidden;
}

.btn-primary {
  background: var(--accent);
  color: #fff;
  border-color: var(--accent);
}

.btn-primary:hover {
  background: #9a5e28;
  border-color: #9a5e28;
  transform: translateY(-1px);
  box-shadow: 0 8px 24px var(--accent-glow);
}

.btn-outline {
  background: transparent;
  color: var(--text-primary);
  border-color: rgba(0, 0, 0, 0.12);
}

.btn-outline:hover {
  border-color: var(--accent);
  color: var(--accent);
  background: var(--accent-subtle);
}

/* --- Stats --- */
.stats-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 2px;
  background: var(--border-subtle);
}

.stat-item {
  background: var(--bg-surface);
  padding: 48px 32px;
  text-align: center;
}

.stat-value {
  font-family: var(--font-mono);
  font-size: 3rem;
  font-weight: 400;
  color: var(--text-primary);
  letter-spacing: -0.02em;
  line-height: 1;
  margin-bottom: 8px;
}

.stat-label {
  font-size: 0.8125rem;
  color: var(--text-secondary);
  letter-spacing: 0.02em;
}

/* --- Cards Grid --- */
.card-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 1px;
  background: var(--border-subtle);
}

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

.card {
  background: var(--bg-surface);
  transition: background var(--transition);
  position: relative;
}

.card:hover {
  background: var(--bg-elevated);
}

.card-link {
  display: block;
  text-decoration: none;
  color: inherit;
}

.card-image {
  width: 100%;
  height: 240px;
  background: var(--bg-base);
  display: flex;
  align-items: center;
  justify-content: center;
  overflow: hidden;
  position: relative;
}

.card-image img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  transition: transform 400ms cubic-bezier(0.33, 1, 0.68, 1);
}

.card:hover .card-image img {
  transform: scale(1.04);
}

.card-image-placeholder {
  color: var(--text-tertiary);
  opacity: 0.4;
}

.card-body {
  padding: 28px 28px 32px;
}

.card-title {
  font-family: var(--font-mono);
  font-size: 1.125rem;
  font-weight: 450;
  color: var(--text-primary);
  letter-spacing: -0.01em;
  margin-bottom: 8px;
  transition: color var(--transition);
}

.card:hover .card-title {
  color: var(--accent);
}

.card-desc {
  font-size: 0.875rem;
  color: var(--text-secondary);
  line-height: 1.6;
  display: -webkit-box;
  -webkit-line-clamp: 2;
  -webkit-box-orient: vertical;
  overflow: hidden;
}

.card-tag {
  display: inline-block;
  font-family: var(--font-mono);
  font-size: 0.625rem;
  color: var(--accent);
  letter-spacing: 0.06em;
  text-transform: uppercase;
  margin-top: 12px;
}

/* --- Testimonials --- */
.testimonial-card {
  background: var(--bg-surface);
  padding: 32px;
  border: 1px solid var(--border-subtle);
}

.testimonial-header {
  display: flex;
  align-items: center;
  gap: 16px;
  margin-bottom: 20px;
}

.testimonial-avatar {
  width: 44px;
  height: 44px;
  border-radius: 50%;
  background: var(--accent);
  color: #fff;
  display: flex;
  align-items: center;
  justify-content: center;
  font-family: var(--font-mono);
  font-size: 1.125rem;
  font-weight: 500;
  flex-shrink: 0;
}

.testimonial-avatar img {
  width: 100%;
  height: 100%;
  border-radius: 50%;
  object-fit: cover;
}

.testimonial-name {
  font-family: var(--font-mono);
  font-size: 0.9375rem;
  color: var(--text-primary);
}

.testimonial-company {
  font-size: 0.75rem;
  color: var(--text-secondary);
  margin-top: 2px;
}

.testimonial-text {
  color: var(--text-secondary);
  font-size: 0.9375rem;
  line-height: 1.7;
  font-style: italic;
}

.testimonial-stars {
  margin-top: 16px;
  color: var(--accent);
  font-size: 0.875rem;
  letter-spacing: 2px;
}

/* --- Form --- */
.form {
  display: flex;
  flex-direction: column;
  gap: 24px;
}

.form-row {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 24px;
}

.form-group {
  display: flex;
  flex-direction: column;
  gap: 8px;
}

.form-label {
  font-family: var(--font-mono);
  font-size: 0.6875rem;
  color: var(--text-secondary);
  text-transform: uppercase;
  letter-spacing: 0.06em;
}

.form-input,
.form-textarea,
.form-select {
  background: transparent;
  border: none;
  border-bottom: 1px solid var(--border-medium);
  padding: 10px 0;
  color: var(--text-primary);
  font-family: var(--font-sans);
  font-size: 0.9375rem;
  transition: border-color var(--transition);
  outline: none;
  width: 100%;
}

.form-input:focus,
.form-textarea:focus,
.form-select:focus {
  border-bottom-color: var(--accent);
}

.form-textarea {
  resize: vertical;
  min-height: 100px;
}

.form-select {
  cursor: pointer;
  -webkit-appearance: none;
  appearance: none;
  background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='12' height='12' fill='%236b6358'%3E%3Cpath d='M6 8L0 0h12z'/%3E%3C/svg%3E");
  background-repeat: no-repeat;
  background-position: right 0 center;
}

.form-select option {
  background: var(--bg-elevated);
  color: var(--text-primary);
}

.form-submit {
  align-self: flex-start;
  margin-top: 8px;
}

/* --- Footer --- */
.footer {
  position: relative;
  z-index: 1;
  border-top: 1px solid var(--border-subtle);
  padding: 64px 40px 32px;
}

.footer-inner {
  max-width: 1200px;
  margin: 0 auto;
}

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

.footer-brand {
  font-family: var(--font-mono);
  font-size: 1.125rem;
  color: var(--text-primary);
  margin-bottom: 12px;
}

.footer-desc {
  font-size: 0.875rem;
  color: var(--text-secondary);
  line-height: 1.7;
}

.footer-heading {
  font-family: var(--font-mono);
  font-size: 0.75rem;
  color: var(--text-primary);
  letter-spacing: 0.06em;
  text-transform: uppercase;
  margin-bottom: 16px;
}

.footer-links {
  list-style: none;
  display: flex;
  flex-direction: column;
  gap: 8px;
}

.footer-links li {
  font-size: 0.875rem;
  color: var(--text-secondary);
}

.footer-bottom {
  border-top: 1px solid var(--border-subtle);
  padding-top: 24px;
  text-align: center;
  font-size: 0.75rem;
  color: var(--text-tertiary);
}

/* --- Loading --- */
.loading-spinner {
  display: inline-block;
  width: 20px;
  height: 20px;
  border: 2px solid rgba(184, 115, 51, 0.20);
  border-top-color: var(--accent);
  animation: spin 0.7s linear infinite;
}

@keyframes spin {
  to { transform: rotate(360deg); }
}

.loading-container {
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  padding: 64px;
  gap: 16px;
  color: var(--text-secondary);
  font-size: 0.875rem;
}

/* --- Reveal Animations --- */
.reveal {
  opacity: 0;
  transform: translateY(20px);
  transition: opacity 500ms ease-out, transform 500ms cubic-bezier(0.33, 1, 0.68, 1);
}

.reveal.visible {
  opacity: 1;
  transform: translateY(0);
}

.reveal-delay-1 { transition-delay: 80ms; }
.reveal-delay-2 { transition-delay: 160ms; }
.reveal-delay-3 { transition-delay: 240ms; }
.reveal-delay-4 { transition-delay: 320ms; }
.reveal-delay-5 { transition-delay: 400ms; }

/* --- Product Detail --- */
.product-layout {
  display: grid;
  grid-template-columns: 260px 1fr;
  gap: 1px;
  background: var(--border-subtle);
  min-height: calc(100vh - 56px);
}

.product-sidebar {
  background: var(--bg-surface);
  padding: 32px 0;
  position: sticky;
  top: 56px;
  height: calc(100vh - 56px);
  overflow-y: auto;
}

.product-sidebar-title {
  font-family: var(--font-mono);
  font-size: 0.8125rem;
  color: var(--text-tertiary);
  text-transform: uppercase;
  letter-spacing: 0.08em;
  padding: 0 28px;
  margin-bottom: 20px;
}

.product-nav-link {
  display: flex;
  align-items: center;
  gap: 12px;
  padding: 14px 28px;
  color: var(--text-secondary);
  text-decoration: none;
  font-size: 0.9375rem;
  transition: all var(--transition);
  border-left: 2px solid transparent;
}

.product-nav-link:hover,
.product-nav-link.active {
  color: var(--accent);
  background: var(--accent-subtle);
  border-left-color: var(--accent);
}

.product-nav-link svg {
  width: 20px;
  height: 20px;
  flex-shrink: 0;
  opacity: 0.6;
}

.product-nav-link:hover svg,
.product-nav-link.active svg {
  opacity: 1;
}

.product-main {
  background: var(--bg-base);
  padding: 40px 48px;
}

.product-hero {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 48px;
  margin-bottom: 64px;
  scroll-margin-top: 72px;
}

.product-gallery {
  display: flex;
  flex-direction: column;
  gap: 12px;
}

.product-gallery-main {
  width: 100%;
  aspect-ratio: 4/3;
  background: var(--bg-surface);
  display: flex;
  align-items: center;
  justify-content: center;
  overflow: hidden;
  border: 1px solid var(--border-subtle);
}

.product-gallery-main img {
  width: 100%;
  height: 100%;
  object-fit: cover;
}

.product-info {
  display: flex;
  flex-direction: column;
  justify-content: center;
}

.product-name {
  font-family: var(--font-mono);
  font-size: 2rem;
  font-weight: 400;
  letter-spacing: -0.03em;
  color: var(--text-primary);
  margin-bottom: 20px;
}

.product-meta {
  display: flex;
  flex-direction: column;
  gap: 10px;
  margin-bottom: 28px;
}

.product-meta-item {
  display: flex;
  align-items: baseline;
  gap: 12px;
  font-size: 0.875rem;
}

.product-meta-label {
  color: var(--text-secondary);
  min-width: 60px;
  font-family: var(--font-mono);
  font-size: 0.6875rem;
  text-transform: uppercase;
  letter-spacing: 0.06em;
}

.product-meta-value {
  color: var(--text-primary);
  font-weight: 450;
}

.product-block {
  background: var(--bg-surface);
  padding: 40px;
  margin-bottom: 1px;
  border: 1px solid var(--border-subtle);
  scroll-margin-top: 72px;
}

.product-block-title {
  font-family: var(--font-mono);
  font-size: 1.25rem;
  font-weight: 450;
  color: var(--text-primary);
  letter-spacing: -0.02em;
  margin-bottom: 28px;
  padding-bottom: 16px;
  border-bottom: 1px solid var(--border-subtle);
}

/* Features Grid */
.features-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 24px;
}

.feature-item {
  text-align: center;
  padding: 28px 16px;
}

.feature-icon {
  width: 48px;
  height: 48px;
  border: 1px solid var(--border-medium);
  display: flex;
  align-items: center;
  justify-content: center;
  margin: 0 auto 16px;
  color: var(--accent);
}

.feature-icon svg {
  width: 20px;
  height: 20px;
}

.feature-name {
  font-family: var(--font-mono);
  font-size: 0.875rem;
  color: var(--text-primary);
  margin-bottom: 8px;
}

.feature-desc {
  font-size: 0.8125rem;
  color: var(--text-secondary);
  line-height: 1.6;
}

/* Specs Table */
.specs-table {
  width: 100%;
  border-collapse: collapse;
}

.specs-table th {
  text-align: left;
  padding: 14px 16px;
  font-family: var(--font-mono);
  font-size: 0.6875rem;
  color: var(--text-tertiary);
  text-transform: uppercase;
  letter-spacing: 0.06em;
  border-bottom: 1px solid var(--border-subtle);
  font-weight: 450;
}

.specs-table td {
  padding: 14px 16px;
  font-size: 0.875rem;
  color: var(--text-primary);
  border-bottom: 1px solid var(--border-subtle);
}

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

.specs-table td:first-child {
  color: var(--text-secondary);
}

/* FAQ */
.faq-list {
  display: flex;
  flex-direction: column;
  gap: 1px;
  background: var(--border-subtle);
}

.faq-item {
  background: var(--bg-base);
}

.faq-question {
  width: 100%;
  padding: 18px 24px;
  display: flex;
  justify-content: space-between;
  align-items: center;
  background: transparent;
  border: none;
  color: var(--text-primary);
  font-family: var(--font-mono);
  font-size: 0.875rem;
  cursor: pointer;
  text-align: left;
  transition: background var(--transition);
}

.faq-question:hover {
  background: var(--bg-surface);
}

.faq-arrow {
  width: 16px;
  height: 16px;
  color: var(--text-secondary);
  transition: transform var(--transition);
  flex-shrink: 0;
}

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

.faq-answer {
  max-height: 0;
  overflow: hidden;
  transition: max-height 350ms ease;
}

.faq-item.open .faq-answer {
  max-height: 300px;
}

.faq-answer p {
  padding: 0 24px 18px;
  font-size: 0.875rem;
  color: var(--text-secondary);
  line-height: 1.7;
}

/* Case Timeline */
.case-list {
  display: flex;
  flex-direction: column;
  gap: 24px;
}

.case-item {
  padding-left: 24px;
  border-left: 1px solid var(--accent);
  padding-bottom: 4px;
}

.case-item h3 {
  font-family: var(--font-mono);
  font-size: 1rem;
  color: var(--text-primary);
  font-weight: 450;
  margin-bottom: 6px;
}

.case-item p {
  font-size: 0.875rem;
  color: var(--text-secondary);
  margin-bottom: 6px;
}

.case-meta {
  font-size: 0.75rem;
  color: var(--text-tertiary);
  display: flex;
  gap: 12px;
  align-items: center;
}

/* --- Alert / Toast --- */
.alert {
  padding: 12px 20px;
  border: 1px solid var(--border-subtle);
  font-size: 0.8125rem;
  margin-bottom: 16px;
}

.alert-success {
  border-color: rgba(0, 200, 83, 0.3);
  color: #69f0ae;
  background: rgba(0, 200, 83, 0.06);
}

.alert-error {
  border-color: rgba(255, 82, 82, 0.3);
  color: #ff8a80;
  background: rgba(255, 82, 82, 0.06);
}

/* --- Responsive --- */
@media (max-width: 1024px) {
  .card-grid { grid-template-columns: repeat(2, 1fr); }
  .stats-grid { grid-template-columns: repeat(2, 1fr); }
  .product-layout { grid-template-columns: 1fr; }
  .product-sidebar { display: none; }
  .product-hero { grid-template-columns: 1fr; }
  .features-grid { grid-template-columns: repeat(2, 1fr); }
  .footer-grid { grid-template-columns: 1fr 1fr; }
}

@media (max-width: 768px) {
  .section { padding: 64px 24px; }
  .nav-inner { padding: 0 16px; }
  .nav-links { display: none; }
  .hero { padding: 0 24px; min-height: 90vh; }
  .hero-content { text-align: left; }
  .hero-title { font-size: clamp(2rem, 8vw, 3rem); }
  .hero-desc { font-size: 0.9375rem; }
  .card-grid { grid-template-columns: 1fr; }
  .stats-grid { grid-template-columns: repeat(2, 1fr); }
  .stat-item { padding: 28px 16px; }
  .stat-value { font-size: 1.75rem; }
  .form-row { grid-template-columns: 1fr; }
  .features-grid { grid-template-columns: 1fr; }
  .section-title { font-size: 1.5rem; }
  .product-main { padding: 24px 16px; }
  .product-block { padding: 24px 16px; }

  /* Mobile language row — visible next to brand */
  .mobile-lang-row {
    display: flex;
    gap: 2px;
    border: 1px solid var(--border-subtle);
    border-radius: var(--radius);
    overflow: hidden;
  }
  .mobile-lang-row .lang-btn {
    padding: 8px 14px;
    font-size: 0.75rem;
  }

  /* Bottom tab bar */
  .mobile-bottom-nav {
    display: flex;
    position: fixed;
    bottom: 0;
    left: 0;
    right: 0;
    z-index: 100;
    background: rgba(249, 248, 246, 0.94);
    backdrop-filter: blur(16px);
    -webkit-backdrop-filter: blur(16px);
    border-top: 1px solid var(--border-subtle);
    padding: 8px 0 calc(8px + env(safe-area-inset-bottom, 0px));
    justify-content: space-around;
    align-items: flex-start;
  }
  .mobile-tab {
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 2px;
    background: none;
    border: none;
    color: var(--text-secondary);
    font-size: 0.625rem;
    font-family: var(--font-sans);
    cursor: pointer;
    padding: 4px 8px;
    min-width: 48px;
    min-height: 48px;
    text-decoration: none;
    transition: color var(--transition);
    -webkit-tap-highlight-color: transparent;
  }
  .mobile-tab.active {
    color: var(--accent);
  }
  .mobile-tab-icon {
    width: 20px;
    height: 20px;
    display: flex;
    align-items: center;
    justify-content: center;
  }
  .mobile-tab-icon svg {
    width: 18px;
    height: 18px;
  }

  /* Push content up for bottom nav */
  body {
    padding-bottom: calc(64px + env(safe-area-inset-bottom, 0px));
  }

  /* Product detail mobile section nav */
  .mobile-section-nav {
    display: flex;
    overflow-x: auto;
    gap: 0;
    padding: 0;
    background: var(--bg-base);
    border-bottom: 1px solid var(--border-subtle);
    position: sticky;
    top: 56px;
    z-index: 99;
    -webkit-overflow-scrolling: touch;
    scrollbar-width: none;
  }
  .mobile-section-nav::-webkit-scrollbar {
    display: none;
  }
  .section-tab {
    flex-shrink: 0;
    padding: 12px 16px;
    font-size: 0.8125rem;
    color: var(--text-secondary);
    text-decoration: none;
    border-bottom: 2px solid transparent;
    font-family: var(--font-sans);
    font-weight: 450;
    transition: all var(--transition);
    white-space: nowrap;
    -webkit-tap-highlight-color: transparent;
  }
  .section-tab.active {
    color: var(--accent);
    border-bottom-color: var(--accent);
  }

  /* Product detail layout adjustments for section nav */
  .product-layout {
    scroll-margin-top: 106px; /* nav(56px) + section-nav(~50px) */
  }
  .product-hero,
  .product-block {
    scroll-margin-top: 106px;
  }

  /* Footer bottom padding for mobile nav */
  .footer {
    padding-bottom: calc(88px + env(safe-area-inset-bottom, 0px));
  }

  /* Larger touch targets for all buttons */
  .btn {
    padding: 14px 28px;
    font-size: 0.8125rem;
  }

  /* Card image responsive height */
  .card-image {
    height: 200px;
  }
}

/* Mobile-only elements hidden on desktop */
@media (min-width: 769px) {
  .mobile-lang-row,
  .mobile-bottom-nav,
  .mobile-section-nav {
    display: none !important;
  }
}