/* ============================================
   Shanghai Zixuan Technology - Corporate Website
   Design: Apple/Google-inspired premium minimalism
   ============================================ */

/* --- CSS Variables --- */
:root {
  --color-primary: #0A1628;
  --color-secondary: #1A1A2E;
  --color-accent: #00D4FF;
  --color-accent-hover: #00b8e6;
  --color-bg: #FFFFFF;
  --color-bg-alt: #F5F5F7;
  --color-heading: #1D1D1F;
  --color-text: #6E6E73;
  --color-muted: #86868B;
  --color-border: rgba(0,0,0,0.06);
  --font-cn: 'Noto Sans SC', -apple-system, BlinkMacSystemFont, sans-serif;
  --font-en: 'Inter', -apple-system, BlinkMacSystemFont, sans-serif;
  --max-width: 1200px;
  --nav-height: 52px;
  --radius-card: 20px;
  --radius-btn: 980px;
  --radius-tag: 980px;
  --ease: cubic-bezier(0.25, 0.1, 0.25, 1);
  --ease-spring: cubic-bezier(0.34, 1.56, 0.64, 1);
  --section-gap: 160px;
}

/* --- Reset & Base --- */
*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }
html { scroll-behavior: smooth; font-size: 16px; }
body {
  font-family: var(--font-cn);
  color: var(--color-text);
  background: var(--color-bg);
  line-height: 1.5;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
  overflow-x: hidden;
}
img { max-width: 100%; height: auto; display: block; }
a { text-decoration: none; color: inherit; transition: color 0.3s var(--ease); }
button { cursor: pointer; border: none; background: none; font-family: inherit; }
table { border-collapse: collapse; width: 100%; }

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

html[lang="en"] body { font-family: var(--font-en); }

/* --- Navigation (Apple-style thin bar) --- */
.nav {
  position: fixed; top: 0; left: 0; right: 0; z-index: 1000;
  height: var(--nav-height);
  transition: background 0.4s var(--ease), backdrop-filter 0.4s var(--ease), box-shadow 0.4s var(--ease);
  background: rgba(255,255,255,0.72);
  backdrop-filter: saturate(180%) blur(20px);
  -webkit-backdrop-filter: saturate(180%) blur(20px);
}
.nav.scrolled {
  background: rgba(255,255,255,0.92);
  box-shadow: 0 0.5px 0 rgba(0,0,0,0.08);
  -webkit-backdrop-filter: saturate(180%) blur(20px);
}
.nav-inner {
  max-width: var(--max-width);
  margin: 0 auto;
  padding: 0 24px;
  height: 100%;
  display: flex;
  align-items: center;
  justify-content: space-between;
}
.nav-logo {
  font-size: 18px;
  font-weight: 700;
  color: #fff;
  letter-spacing: -0.01em;
  transition: color 0.3s var(--ease);
}
.nav.scrolled .nav-logo { color: var(--color-heading); }
.nav-links {
  display: flex;
  gap: 28px;
}
.nav-link {
  font-size: 12px;
  font-weight: 400;
  color: var(--color-heading);
  opacity: 0.8;
  transition: opacity 0.3s var(--ease);
  letter-spacing: 0.01em;
}
.nav-link:hover { opacity: 1; }
.nav.scrolled .nav-link { color: var(--color-heading); opacity: 0.8; }
.nav.scrolled .nav-link:hover { opacity: 1; }
.nav-actions {
  display: flex;
  align-items: center;
  gap: 12px;
}
.lang-toggle {
  font-size: 12px;
  font-weight: 500;
  color: var(--color-heading);
  opacity: 0.8;
  padding: 4px 10px;
  border: 1px solid var(--color-border);
  border-radius: var(--radius-tag);
  transition: all 0.3s var(--ease);
}
.lang-toggle:hover { opacity: 1; border-color: var(--color-heading); }
.nav-cta {
  font-size: 12px;
  font-weight: 500;
  color: #fff;
  background: var(--color-accent);
  padding: 7px 16px;
  border-radius: var(--radius-btn);
  transition: all 0.3s var(--ease);
}
.nav-cta:hover { background: var(--color-accent-hover); }
.hamburger {
  display: none;
  flex-direction: column;
  gap: 4px;
  padding: 4px;
}
.hamburger span {
  width: 18px; height: 1.5px;
  background: #fff;
  border-radius: 2px;
  transition: all 0.3s var(--ease);
}
.nav.scrolled .hamburger span { background: var(--color-heading); }

/* --- Hero (Apple-style dramatic) --- */
.hero {
  min-height: 100vh;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  text-align: center;
  background: #FFFFFF;
  position: relative;
  overflow: hidden;
  padding: 140px 24px 80px;
}
.hero-content {
  position: relative;
  z-index: 2;
  max-width: 800px;
}
.hero-eyebrow {
  font-size: 14px;
  font-weight: 500;
  color: #86868B;
  letter-spacing: 0.06em;
  text-transform: uppercase;
  margin-bottom: 20px;
}
.hero-title {
  font-size: clamp(40px, 7vw, 80px);
  font-weight: 500;
  line-height: 1.15;
  letter-spacing: -0.02em;
  margin-bottom: 24px;
}
.hero-title-dark {
  color: #1D1D1F;
}
.hero-subtitle {
  font-size: clamp(17px, 2.2vw, 22px);
  margin-bottom: 48px;
  font-weight: 400;
  letter-spacing: 0.01em;
  line-height: 1.6;
}
.hero-subtitle-dark {
  color: #6E6E73;
}
.hero-buttons {
  display: flex;
  gap: 16px;
  justify-content: center;
  flex-wrap: wrap;
  margin-bottom: 80px;
}
.btn-dark {
  display: inline-block;
  padding: 16px 40px;
  background: #1D1D1F;
  color: #FFFFFF;
  border-radius: var(--radius-btn);
  font-size: 16px;
  font-weight: 500;
  text-decoration: none;
  transition: all var(--transition);
  border: 1px solid #1D1D1F;
}
.btn-dark:hover {
  background: #000;
  transform: scale(1.02);
}
.btn-ghost {
  display: inline-block;
  padding: 16px 40px;
  background: transparent;
  color: #1D1D1F;
  border-radius: var(--radius-btn);
  font-size: 16px;
  font-weight: 500;
  text-decoration: none;
  transition: all var(--transition);
  border: 1px solid #D2D2D7;
}
.btn-ghost:hover {
  background: #F5F5F7;
  border-color: #1D1D1F;
}
/* Hero Showcase - Product Image Carousel */
.hero-showcase {
  position: relative;
  z-index: 2;
  width: 100%;
  max-width: 1100px;
  margin-top: 20px;
  overflow: hidden;
}
.hero-showcase-track {
  display: flex;
  gap: 20px;
  animation: showcaseScroll 30s linear infinite;
  width: max-content;
}
.hero-showcase-item {
  flex-shrink: 0;
  width: 260px;
  text-align: center;
}
.hero-showcase-item img {
  width: 260px;
  height: 200px;
  object-fit: cover;
  border-radius: 20px;
  margin-bottom: 12px;
  transition: transform 0.4s var(--ease);
}
.hero-showcase-item:hover img {
  transform: scale(1.03);
}
.hero-showcase-item span {
  font-size: 14px;
  color: #6E6E73;
  font-weight: 500;
}
@keyframes showcaseScroll {
  0% { transform: translateX(0); }
  100% { transform: translateX(-50%); }
}
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  padding: 14px 32px;
  font-size: 17px;
  font-weight: 500;
  border-radius: var(--radius-btn);
  transition: all 0.3s var(--ease);
  letter-spacing: -0.01em;
}
.btn-primary {
  background: var(--color-accent);
  color: #000;
}
.btn-primary:hover { background: var(--color-accent-hover); transform: scale(1.02); }
.btn-outline {
  border: 1.5px solid rgba(255,255,255,0.3);
  color: #fff;
}
.btn-outline:hover { border-color: rgba(255,255,255,0.6); background: rgba(255,255,255,0.05); }
.btn-ghost {
  color: var(--color-accent);
  padding: 14px 0;
  font-size: 17px;
}
.btn-ghost:hover { color: var(--color-accent-hover); }
.hero-tags {
  display: flex;
  gap: 32px;
  justify-content: center;
  flex-wrap: wrap;
}
.hero-tag {
  font-size: 13px;
  color: rgba(255,255,255,0.4);
  font-weight: 400;
  letter-spacing: 0.02em;
}

/* --- Stats (Apple-style big numbers) --- */
.stats {
  background: var(--color-bg);
  padding: 120px 0;
  border-bottom: 1px solid var(--color-border);
}
.stats-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 48px;
  text-align: center;
}
.stat-item { padding: 0; }
.stat-number {
  font-family: var(--font-en);
  font-size: clamp(56px, 7vw, 96px);
  font-weight: 500;
  color: var(--color-heading);
  line-height: 1;
  letter-spacing: -0.03em;
}
.stat-suffix {
  font-family: var(--font-en);
  font-size: clamp(28px, 3.5vw, 48px);
  font-weight: 700;
  color: var(--color-heading);
  letter-spacing: -0.02em;
}
.stat-label {
  display: block;
  margin-top: 12px;
  font-size: 14px;
  color: var(--color-muted);
  font-weight: 400;
  letter-spacing: 0.02em;
}

/* --- Section Common --- */
.section { padding: var(--section-gap) 0; }
.section-header {
  text-align: center;
  margin-bottom: 80px;
}
.section-title {
  font-size: clamp(32px, 5vw, 56px);
  font-weight: 600;
  color: var(--color-heading);
  margin-bottom: 16px;
  letter-spacing: -0.02em;
  line-height: 1.15;
}
.section-desc {
  font-size: 19px;
  color: var(--color-muted);
  max-width: 600px;
  margin: 0 auto;
  line-height: 1.6;
  font-weight: 400;
}

/* --- About / Capabilities --- */
.capabilities-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 20px;
}
.capability-card {
  background: var(--color-bg-alt);
  border-radius: var(--radius-card);
  padding: 40px 32px;
  transition: all 0.4s var(--ease);
}
.capability-card:hover {
  transform: scale(1.02);
  background: #EDEDF0;
}
.capability-icon {
  color: var(--color-heading);
  margin-bottom: 24px;
  opacity: 0.8;
}
.capability-title {
  font-size: 21px;
  font-weight: 600;
  color: var(--color-heading);
  margin-bottom: 12px;
  letter-spacing: -0.01em;
}
.capability-desc {
  font-size: 14px;
  color: var(--color-muted);
  line-height: 1.6;
}

/* --- Products (Apple-style showcase) --- */
.products { background: var(--color-bg-alt); }
.products-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 20px;
}
.product-card {
  background: var(--color-bg);
  border-radius: var(--radius-card);
  overflow: hidden;
  transition: all 0.4s var(--ease);
}
.product-card:hover {
  transform: scale(1.02);
  box-shadow: 0 20px 60px rgba(0,0,0,0.08);
}
.product-img {
  height: 260px;
  overflow: hidden;
  background: #F0F0F3;
}
.product-img img {
  width: 100%; height: 100%;
  object-fit: cover;
  transition: transform 0.6s var(--ease);
}
.product-card:hover .product-img img { transform: scale(1.04); }
.product-info { padding: 32px; }
.product-name {
  font-size: 21px;
  font-weight: 600;
  color: var(--color-heading);
  margin-bottom: 8px;
  letter-spacing: -0.01em;
}
.product-desc {
  font-size: 14px;
  color: var(--color-muted);
  margin-bottom: 16px;
  line-height: 1.5;
}
.product-tags {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  margin-bottom: 16px;
}
.product-tags span {
  font-size: 12px;
  color: var(--color-heading);
  background: var(--color-bg-alt);
  padding: 5px 12px;
  border-radius: var(--radius-tag);
  font-weight: 500;
}
.product-sub {
  display: flex;
  flex-direction: column;
  gap: 10px;
  margin-bottom: 16px;
  padding: 16px;
  background: var(--color-bg-alt);
  border-radius: 14px;
}
.product-sub-item {
  display: flex;
  flex-direction: column;
  gap: 2px;
}
.product-sub-name {
  font-size: 13px;
  font-weight: 600;
  color: var(--color-heading);
}
.product-sub-params {
  font-size: 12px;
  color: var(--color-muted);
}
.product-link {
  font-size: 14px;
  font-weight: 500;
  color: var(--color-accent);
  transition: color 0.3s var(--ease);
}
.product-link:hover { color: var(--color-accent-hover); }

/* --- Applications --- */
.applications-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 20px;
}
.app-card {
  background: var(--color-bg-alt);
  border-radius: var(--radius-card);
  padding: 40px 32px;
  transition: all 0.4s var(--ease);
}
.app-card:hover {
  transform: scale(1.02);
  background: #EDEDF0;
}
.app-icon {
  color: var(--color-heading);
  margin-bottom: 24px;
  opacity: 0.7;
}
.app-name {
  font-size: 24px;
  font-weight: 600;
  color: var(--color-heading);
  margin-bottom: 10px;
  letter-spacing: -0.02em;
}
.app-desc {
  font-size: 14px;
  color: var(--color-muted);
  margin-bottom: 16px;
  line-height: 1.5;
}
.app-products {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  margin-bottom: 20px;
}
.app-products span {
  font-size: 12px;
  color: var(--color-text);
  background: var(--color-bg);
  padding: 5px 12px;
  border-radius: var(--radius-tag);
}
.app-link {
  font-size: 14px;
  font-weight: 500;
  color: var(--color-accent);
}
.app-link:hover { color: var(--color-accent-hover); }

/* --- Cases (Apple-style storytelling) --- */
.cases { background: var(--color-bg-alt); }
.cases-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 20px;
}
.case-card {
  background: var(--color-bg);
  border-radius: var(--radius-card);
  padding: 44px;
  transition: all 0.4s var(--ease);
}
.case-card:hover {
  transform: scale(1.01);
  box-shadow: 0 20px 60px rgba(0,0,0,0.06);
}
.case-industry {
  display: inline-block;
  font-size: 12px;
  font-weight: 600;
  color: var(--color-accent);
  background: rgba(0,212,255,0.08);
  padding: 5px 14px;
  border-radius: var(--radius-tag);
  margin-bottom: 20px;
  text-transform: uppercase;
  letter-spacing: 0.02em;
}
.case-title {
  font-size: 22px;
  font-weight: 600;
  color: var(--color-heading);
  margin-bottom: 14px;
  line-height: 1.3;
  letter-spacing: -0.01em;
}
.case-desc {
  font-size: 14px;
  color: var(--color-muted);
  line-height: 1.7;
  margin-bottom: 24px;
}
.case-data {
  display: flex;
  gap: 40px;
  margin-bottom: 20px;
  padding: 24px 0;
  border-top: 1px solid var(--color-border);
  border-bottom: 1px solid var(--color-border);
}
.case-data-item { display: flex; align-items: baseline; gap: 4px; }
.case-data-value {
  font-family: var(--font-en);
  font-size: 40px;
  font-weight: 700;
  color: var(--color-heading);
  line-height: 1;
  letter-spacing: -0.03em;
}
.case-data-unit {
  font-size: 14px;
  color: var(--color-muted);
}
.case-tags {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
}
.case-tags span {
  font-size: 12px;
  color: var(--color-muted);
  background: var(--color-bg-alt);
  padding: 5px 12px;
  border-radius: var(--radius-tag);
}

/* --- Technology --- */
.tech-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 20px;
  margin-bottom: 80px;
}
.tech-card {
  background: var(--color-bg-alt);
  border-radius: var(--radius-card);
  padding: 36px 28px;
  text-align: center;
  transition: all 0.4s var(--ease);
}
.tech-card:hover {
  transform: scale(1.02);
  background: #EDEDF0;
}
.tech-icon {
  color: var(--color-heading);
  margin-bottom: 20px;
  opacity: 0.7;
}
.tech-title {
  font-size: 19px;
  font-weight: 600;
  color: var(--color-heading);
  margin-bottom: 10px;
  letter-spacing: -0.01em;
}
.tech-desc {
  font-size: 14px;
  color: var(--color-muted);
  line-height: 1.6;
}
.quality-table {
  background: var(--color-bg);
  border-radius: var(--radius-card);
  overflow: hidden;
  box-shadow: 0 4px 20px rgba(0,0,0,0.04);
}
.quality-table table { width: 100%; }
.quality-table th {
  background: var(--color-primary);
  color: #fff;
  font-size: 14px;
  font-weight: 500;
  padding: 18px 28px;
  text-align: left;
  letter-spacing: 0.01em;
}
.quality-table td {
  font-size: 14px;
  padding: 16px 28px;
  border-bottom: 1px solid var(--color-border);
  color: var(--color-text);
}
.quality-table tr:last-child td { border-bottom: none; }
.quality-table tr:hover td { background: var(--color-bg-alt); }

/* --- Contact (Apple-style dark section) --- */
.contact {
  background: #000;
  color: #fff;
}
.contact .section-title { color: #fff; }
.contact .section-desc { color: rgba(255,255,255,0.5); }
.contact-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 80px;
  align-items: start;
}
.contact-info { display: flex; flex-direction: column; gap: 32px; padding-top: 16px; }
.contact-item {
  display: flex;
  gap: 16px;
  align-items: flex-start;
}
.contact-item svg { color: var(--color-accent); flex-shrink: 0; margin-top: 2px; }
.contact-item p {
  font-size: 15px;
  color: rgba(255,255,255,0.7);
  line-height: 1.6;
}
/* Form */
.contact-form {
  background: rgba(255,255,255,0.04);
  border: 1px solid rgba(255,255,255,0.08);
  border-radius: var(--radius-card);
  padding: 44px;
}
.form-steps {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 0;
  margin-bottom: 40px;
}
.form-step {
  width: 36px; height: 36px;
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 14px;
  font-weight: 600;
  color: rgba(255,255,255,0.25);
  background: rgba(255,255,255,0.06);
  transition: all 0.3s var(--ease);
}
.form-step.active {
  background: var(--color-accent);
  color: #000;
}
.form-step.completed {
  background: var(--color-accent);
  color: #000;
}
.form-step-line {
  width: 48px; height: 2px;
  background: rgba(255,255,255,0.08);
  margin: 0 8px;
}
.form-panel { display: none; }
.form-panel.active { display: block; }
.form-panel-title {
  font-size: 20px;
  font-weight: 600;
  color: #fff;
  margin-bottom: 28px;
  text-align: center;
}
.industry-buttons, .volume-options {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 12px;
  margin-bottom: 32px;
}
.industry-btn, .volume-btn {
  padding: 16px 12px;
  font-size: 14px;
  font-weight: 500;
  color: rgba(255,255,255,0.6);
  background: rgba(255,255,255,0.04);
  border: 1px solid rgba(255,255,255,0.1);
  border-radius: 14px;
  transition: all 0.3s var(--ease);
  text-align: center;
}
.industry-btn:hover, .volume-btn:hover {
  border-color: rgba(255,255,255,0.3);
  color: #fff;
}
.industry-btn.selected, .volume-btn.selected {
  background: rgba(0,212,255,0.1);
  border-color: var(--color-accent);
  color: var(--color-accent);
}
.form-fields { display: flex; flex-direction: column; gap: 14px; margin-bottom: 28px; }
.form-input {
  width: 100%;
  padding: 16px 18px;
  font-size: 16px;
  font-family: inherit;
  color: #fff;
  background: rgba(255,255,255,0.04);
  border: 1px solid rgba(255,255,255,0.12);
  border-radius: 14px;
  outline: none;
  transition: border-color 0.3s var(--ease);
}
.form-input::placeholder { color: rgba(255,255,255,0.3); }
.form-input:focus { border-color: var(--color-accent); }
.form-textarea { resize: vertical; min-height: 80px; }
.form-nav {
  display: flex;
  justify-content: space-between;
  gap: 12px;
}
.form-next, .form-submit { width: 100%; }
.form-success {
  text-align: center;
  padding: 40px 0;
}
.form-success h4 {
  font-size: 24px;
  color: #fff;
  margin: 20px 0 8px;
}
.form-success p {
  color: rgba(255,255,255,0.5);
  font-size: 15px;
}

/* --- Footer (Apple-style minimal) --- */
.footer {
  background: #1D1D1F;
  padding: 48px 0 24px;
}
.footer-grid {
  display: grid;
  grid-template-columns: 2fr 1fr 1fr 1.5fr;
  gap: 48px;
  margin-bottom: 40px;
}
.footer-logo {
  font-size: 18px;
  font-weight: 700;
  color: #fff;
}
.footer-fullname {
  font-size: 13px;
  color: rgba(255,255,255,0.35);
  margin-top: 8px;
}
.footer-links h4 {
  font-size: 12px;
  font-weight: 600;
  color: rgba(255,255,255,0.5);
  margin-bottom: 14px;
  text-transform: uppercase;
  letter-spacing: 0.05em;
}
.footer-links a, .footer-links p {
  display: block;
  font-size: 13px;
  color: rgba(255,255,255,0.35);
  margin-bottom: 8px;
  transition: color 0.3s var(--ease);
}
.footer-links a:hover { color: rgba(255,255,255,0.7); }
.footer-bottom {
  border-top: 1px solid rgba(255,255,255,0.06);
  padding-top: 20px;
  text-align: center;
}
.footer-bottom p {
  font-size: 12px;
  color: rgba(255,255,255,0.25);
}

/* --- Scroll Animations (Apple-style smooth) --- */
.fade-in {
  opacity: 0;
  transform: translateY(20px);
  transition: opacity 0.8s var(--ease), transform 0.8s var(--ease);
}
.fade-in.visible {
  opacity: 1;
  transform: translateY(0);
}

/* --- Responsive --- */
@media (max-width: 1024px) {
  :root { --section-gap: 120px; }
  .capabilities-grid { grid-template-columns: repeat(2, 1fr); }
  .products-grid { grid-template-columns: repeat(2, 1fr); }
  .applications-grid { grid-template-columns: repeat(2, 1fr); }
  .tech-grid { grid-template-columns: repeat(2, 1fr); }
  .footer-grid { grid-template-columns: repeat(2, 1fr); }
}

@media (max-width: 768px) {
  :root { --section-gap: 80px; --nav-height: 48px; }
  .nav-links { 
    display: none;
    position: fixed;
    top: var(--nav-height);
    left: 0; right: 0;
    background: rgba(255,255,255,0.98);
    backdrop-filter: blur(20px);
    -webkit-backdrop-filter: blur(20px);
    flex-direction: column;
    padding: 24px;
    gap: 0;
    border-bottom: 1px solid var(--color-border);
  }
  .nav-links.open { display: flex; }
  .nav-link {
    padding: 14px 0;
    font-size: 14px;
    color: var(--color-heading) !important;
    border-bottom: 1px solid var(--color-border);
  }
  .nav-link:last-child { border-bottom: none; }
  .nav-cta { display: none; }
  .hamburger { display: flex; }

  .hero { padding: 100px 20px 60px; min-height: 90vh; }
  .hero-title { font-size: clamp(32px, 8vw, 48px); }
  .hero-subtitle { font-size: 17px; margin-bottom: 32px; }
  .hero-buttons { margin-bottom: 48px; }
  .hero-showcase-item { width: 200px; }
  .hero-showcase-item img { width: 200px; height: 150px; }

  .stats { padding: 80px 0; }
  .stats-grid { grid-template-columns: repeat(2, 1fr); gap: 40px 24px; }

  .section-header { margin-bottom: 48px; }
  .capabilities-grid { grid-template-columns: 1fr; gap: 12px; }
  .products-grid { grid-template-columns: 1fr; }
  .applications-grid { grid-template-columns: 1fr; }
  .cases-grid { grid-template-columns: 1fr; }
  .tech-grid { grid-template-columns: 1fr 1fr; gap: 12px; }
  .contact-grid { grid-template-columns: 1fr; gap: 48px; }
  .footer-grid { grid-template-columns: 1fr; gap: 32px; }

  .case-data { flex-direction: column; gap: 16px; }
  .case-data-value { font-size: 32px; }
  .case-card { padding: 28px; }

  .industry-buttons, .volume-options { grid-template-columns: repeat(2, 1fr); }
  .contact-form { padding: 28px; }

  .quality-table { overflow-x: auto; }
}

@media (max-width: 480px) {
  .stats-grid { grid-template-columns: 1fr 1fr; gap: 32px 16px; }
  .stat-number { font-size: 48px; }
  .stat-suffix { font-size: 24px; }
  .tech-grid { grid-template-columns: 1fr; }
  .hero-buttons { flex-direction: column; align-items: center; }
  .btn { width: 100%; max-width: 280px; }
}

/* Option A typography: restrained, international product-style hierarchy */
.hero-title { font-weight: 500; letter-spacing: 0.02em; }
.section-title, .section-heading, h2, h3 { font-weight: 600; letter-spacing: 0.01em; }
.stat-number, .metric-number { font-weight: 500; letter-spacing: 0.02em; }