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

:root {
  --color-primary: #1a5276;
  --color-primary-light: #2b6cb0;
  --color-accent: #c0392b;
  --color-bg: #ffffff;
  --color-bg-alt: #f5f6f8;
  --color-text: #1c1c1e;
  --color-text-secondary: #5a5a5e;
  --color-border: #e2e4e8;
  --color-green: #27ae60;
  --color-yellow: #d4a017;
  --color-orange: #e67e22;
  --color-red: #c0392b;
  --color-purple: #8e44ad;
  --color-blue: #2980b9;
  --radius: 10px;
  --radius-lg: 16px;
  --shadow-sm: 0 1px 3px rgba(0,0,0,0.06);
  --shadow-md: 0 4px 12px rgba(0,0,0,0.08);
  --max-width: 1120px;
}

html {
  scroll-behavior: smooth;
  -webkit-text-size-adjust: 100%;
}

body {
  font-family: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
  color: var(--color-text);
  background: var(--color-bg);
  line-height: 1.6;
  -webkit-font-smoothing: antialiased;
}

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

h1, h2, h3, h4 {
  line-height: 1.25;
}

a {
  color: inherit;
  text-decoration: none;
}

img {
  max-width: 100%;
  display: block;
}

/* ===== Navigation ===== */
.nav {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  z-index: 100;
  background: rgba(255,255,255,0.95);
  backdrop-filter: blur(8px);
  border-bottom: 1px solid var(--color-border);
  transition: box-shadow 0.2s;
}

.nav.scrolled {
  box-shadow: var(--shadow-sm);
}

.nav-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 60px;
}

.nav-logo {
  display: flex;
  align-items: center;
  gap: 8px;
  font-weight: 700;
  font-size: 1rem;
  color: var(--color-primary);
}

.logo-icon {
  font-size: 1.25rem;
  color: var(--color-accent);
}

.nav-links {
  display: flex;
  align-items: center;
  gap: 28px;
}

.nav-links a {
  font-size: 0.875rem;
  font-weight: 500;
  color: var(--color-text-secondary);
  transition: color 0.15s;
}

.nav-links a:hover {
  color: var(--color-primary);
}

.lang-dropdown {
  position: relative;
}

.lang-btn {
  font-size: 0.8rem;
  font-weight: 600;
  padding: 5px 12px;
  border: 1.5px solid var(--color-border);
  border-radius: 6px;
  background: transparent;
  color: var(--color-text-secondary);
  cursor: pointer;
  transition: border-color 0.15s, color 0.15s;
  white-space: nowrap;
}

.lang-btn:hover {
  border-color: var(--color-primary);
  color: var(--color-primary);
}

.lang-menu {
  display: none;
  position: absolute;
  top: calc(100% + 6px);
  right: 0;
  background: #fff;
  border: 1px solid var(--color-border);
  border-radius: 8px;
  box-shadow: var(--shadow-md);
  min-width: 140px;
  z-index: 200;
  padding: 4px 0;
}

.lang-menu.open {
  display: block;
}

.lang-menu button {
  display: block;
  width: 100%;
  text-align: left;
  padding: 8px 16px;
  border: none;
  background: none;
  font-size: 0.85rem;
  font-family: inherit;
  color: var(--color-text-secondary);
  cursor: pointer;
  transition: background 0.1s, color 0.1s;
}

.lang-menu button:hover {
  background: var(--color-bg-alt);
  color: var(--color-text);
}

.lang-menu button.active {
  color: var(--color-primary);
  font-weight: 600;
}

.nav-mobile-toggle {
  display: none;
  flex-direction: column;
  gap: 4px;
  background: none;
  border: none;
  cursor: pointer;
  padding: 4px;
}

.nav-mobile-toggle span {
  display: block;
  width: 20px;
  height: 2px;
  background: var(--color-text);
  border-radius: 1px;
  transition: transform 0.2s;
}

/* ===== Hero ===== */
.hero {
  padding: 120px 0 80px;
  background: var(--color-bg-alt);
}

.hero-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 60px;
  align-items: center;
}

.hero-text h1 {
  font-size: 2.75rem;
  font-weight: 700;
  color: var(--color-text);
  letter-spacing: -0.02em;
}

.hero-sub {
  margin-top: 20px;
  font-size: 1.125rem;
  color: var(--color-text-secondary);
  max-width: 480px;
}

.hero-actions {
  margin-top: 32px;
}

.hero-note {
  margin-top: 12px;
  font-size: 0.8rem;
  color: var(--color-text-secondary);
}

/* Button */
.btn {
  display: inline-block;
  font-weight: 600;
  font-size: 0.9375rem;
  padding: 12px 28px;
  border-radius: 8px;
  transition: background 0.15s, transform 0.1s;
  cursor: pointer;
  border: none;
}

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

.btn-primary:hover {
  background: var(--color-primary-light);
}

.btn-primary:active {
  transform: scale(0.98);
}

.btn-lg {
  padding: 16px 36px;
  font-size: 1rem;
}

/* Phone Mockup */
.hero-visual {
  display: flex;
  justify-content: center;
}

.hero-phones {
  display: flex;
  align-items: flex-start;
  gap: 0;
  position: relative;
}

.phone-mockup {
  background: #fff;
  border-radius: 32px;
  padding: 10px;
  box-shadow: 0 8px 40px rgba(0,0,0,0.1), 0 1px 3px rgba(0,0,0,0.06);
  border: 1px solid var(--color-border);
  overflow: hidden;
}

.phone-main {
  width: 260px;
  z-index: 2;
  position: relative;
}

.phone-secondary {
  width: 230px;
  margin-left: -40px;
  margin-top: 60px;
  z-index: 1;
  opacity: 0.92;
}

.phone-screenshot {
  width: 100%;
  height: auto;
  border-radius: 22px;
  display: block;
}

.tag-normal {
  background: #e8f5e9;
  color: #2e7d32;
}

.tag-elevated {
  background: #fff3e0;
  color: #e65100;
}

.tag-unit {
  background: #e3f2fd;
  color: #1565c0;
}

/* ===== Features ===== */
.features {
  padding: 100px 0;
}

.features h2,
.how-it-works h2,
.classification h2,
.health-tips h2,
.export-section h2 {
  font-size: 2rem;
  font-weight: 700;
  text-align: center;
  letter-spacing: -0.01em;
}

.section-sub {
  text-align: center;
  color: var(--color-text-secondary);
  font-size: 1.05rem;
  margin-top: 12px;
  max-width: 560px;
  margin-left: auto;
  margin-right: auto;
}

.features-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 24px;
  margin-top: 56px;
}

.feature-card {
  background: var(--color-bg-alt);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
  padding: 28px 24px;
  position: relative;
  transition: box-shadow 0.2s;
}

.feature-card:hover {
  box-shadow: var(--shadow-md);
}

.feature-icon {
  font-size: 1.75rem;
  margin-bottom: 14px;
}

.feature-card h3 {
  font-size: 1.05rem;
  font-weight: 600;
  margin-bottom: 8px;
}

.feature-card p {
  font-size: 0.9rem;
  color: var(--color-text-secondary);
  line-height: 1.55;
}

.feature-badge {
  display: inline-block;
  margin-top: 12px;
  font-size: 0.7rem;
  font-weight: 600;
  color: var(--color-primary);
  background: #e8f0fe;
  padding: 3px 10px;
  border-radius: 4px;
}

/* ===== How It Works ===== */
.how-it-works {
  padding: 100px 0;
  background: var(--color-bg-alt);
}

.tabs-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 20px;
  margin-top: 56px;
}

.tab-card {
  background: #fff;
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
  padding: 28px 22px;
  transition: box-shadow 0.2s;
}

.tab-card:hover {
  box-shadow: var(--shadow-md);
}

.tab-number {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 32px;
  height: 32px;
  border-radius: 50%;
  background: var(--color-primary);
  color: #fff;
  font-size: 0.85rem;
  font-weight: 700;
  margin-bottom: 14px;
}

.tab-card h3 {
  font-size: 1.05rem;
  font-weight: 600;
  margin-bottom: 8px;
}

.tab-card p {
  font-size: 0.875rem;
  color: var(--color-text-secondary);
  line-height: 1.55;
}

/* ===== Classification ===== */
.classification {
  padding: 100px 0;
}

.class-tables {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 40px;
  margin-top: 48px;
}

.class-table-wrap h3 {
  font-size: 1.1rem;
  font-weight: 600;
  margin-bottom: 14px;
}

table {
  width: 100%;
  border-collapse: collapse;
  font-size: 0.875rem;
}

thead th {
  text-align: left;
  font-weight: 600;
  padding: 10px 12px;
  border-bottom: 2px solid var(--color-border);
  color: var(--color-text-secondary);
  font-size: 0.8rem;
  text-transform: uppercase;
  letter-spacing: 0.03em;
}

tbody td {
  padding: 10px 12px;
  border-bottom: 1px solid var(--color-border);
}

.dot {
  display: inline-block;
  width: 10px;
  height: 10px;
  border-radius: 50%;
  margin-right: 8px;
  vertical-align: middle;
}

.dot-green { background: var(--color-green); }
.dot-yellow { background: var(--color-yellow); }
.dot-orange { background: var(--color-orange); }
.dot-red { background: var(--color-red); }
.dot-purple { background: var(--color-purple); }
.dot-blue { background: var(--color-blue); }

/* ===== Health Tips ===== */
.health-tips {
  padding: 100px 0;
  background: var(--color-bg-alt);
}

.tips-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 20px;
  margin-top: 48px;
}

.tip-card {
  background: #fff;
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
  padding: 24px;
  transition: box-shadow 0.2s;
}

.tip-card:hover {
  box-shadow: var(--shadow-md);
}

.tip-cat {
  display: inline-block;
  font-size: 0.7rem;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.04em;
  color: var(--color-primary);
  background: #e8f0fe;
  padding: 3px 10px;
  border-radius: 4px;
  margin-bottom: 10px;
}

.tip-card h4 {
  font-size: 1rem;
  font-weight: 600;
  margin-bottom: 8px;
}

.tip-card p {
  font-size: 0.875rem;
  color: var(--color-text-secondary);
  line-height: 1.55;
}

/* ===== Export ===== */
.export-section {
  padding: 100px 0;
}

.export-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 60px;
  align-items: center;
}

.export-text h2 {
  text-align: left;
}

.export-text p {
  font-size: 1rem;
  color: var(--color-text-secondary);
  margin-top: 16px;
  line-height: 1.65;
}

.export-formats {
  display: flex;
  gap: 10px;
  margin-top: 24px;
}

.format-tag {
  font-size: 0.8rem;
  font-weight: 600;
  padding: 6px 16px;
  background: var(--color-bg-alt);
  border: 1px solid var(--color-border);
  border-radius: 6px;
  color: var(--color-text-secondary);
}

.export-doc {
  background: #fff;
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
  padding: 24px;
  box-shadow: var(--shadow-md);
}

.doc-header {
  display: flex;
  align-items: center;
  gap: 12px;
  margin-bottom: 20px;
  padding-bottom: 16px;
  border-bottom: 1px solid var(--color-border);
}

.doc-icon {
  font-size: 1.75rem;
}

.doc-title {
  font-weight: 600;
  font-size: 0.95rem;
}

.doc-meta {
  font-size: 0.75rem;
  color: var(--color-text-secondary);
}

.doc-row {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: 10px 0;
  font-size: 0.85rem;
  border-bottom: 1px solid var(--color-border);
}

.doc-row:last-child {
  border-bottom: none;
}

.doc-row-fade {
  opacity: 0.4;
}

/* ===== CTA ===== */
.cta-section {
  padding: 80px 0;
  background: var(--color-primary);
  color: #fff;
}

.cta-inner {
  text-align: center;
}

.cta-inner h2 {
  font-size: 2rem;
  font-weight: 700;
}

.cta-inner p {
  font-size: 1.05rem;
  opacity: 0.85;
  margin-top: 12px;
}

.cta-section .btn-primary {
  margin-top: 28px;
  background: #fff;
  color: var(--color-primary);
}

.cta-section .btn-primary:hover {
  background: #f0f0f0;
}

/* ===== Footer ===== */
.footer {
  padding: 48px 0 32px;
  border-top: 1px solid var(--color-border);
}

.footer-top {
  display: flex;
  align-items: center;
  justify-content: space-between;
  margin-bottom: 24px;
}

.footer-brand {
  display: flex;
  align-items: center;
  gap: 8px;
  font-weight: 600;
  font-size: 0.9rem;
  color: var(--color-text);
}

.footer-links {
  display: flex;
  gap: 24px;
}

.footer-links a {
  font-size: 0.85rem;
  color: var(--color-text-secondary);
  transition: color 0.15s;
}

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

.footer-disclaimer {
  border-top: 1px solid var(--color-border);
  padding-top: 20px;
  margin-bottom: 20px;
}

.footer-disclaimer p {
  font-size: 0.78rem;
  color: var(--color-text-secondary);
  line-height: 1.6;
  max-width: 800px;
}

.footer-bottom p {
  font-size: 0.75rem;
  color: var(--color-text-secondary);
}

/* ===== Legal Pages ===== */
.legal-page {
  padding: 120px 0 80px;
}

.legal-container {
  max-width: 760px;
}

.legal-container > h1 {
  font-size: 2rem;
  font-weight: 700;
  letter-spacing: -0.01em;
}

.legal-updated {
  font-size: 0.85rem;
  color: var(--color-text-secondary);
  margin-top: 8px;
  margin-bottom: 40px;
}

.legal-body h2 {
  font-size: 1.25rem;
  font-weight: 600;
  margin-top: 36px;
  margin-bottom: 12px;
  color: var(--color-text);
}

.legal-body h3 {
  font-size: 1.05rem;
  font-weight: 600;
  margin-top: 24px;
  margin-bottom: 8px;
  color: var(--color-text);
}

.legal-body p {
  font-size: 0.925rem;
  color: var(--color-text-secondary);
  line-height: 1.7;
  margin-bottom: 12px;
}

.legal-body ul {
  margin: 8px 0 16px 20px;
  padding: 0;
}

.legal-body li {
  font-size: 0.925rem;
  color: var(--color-text-secondary);
  line-height: 1.7;
  margin-bottom: 6px;
}

.legal-body a {
  color: var(--color-primary-light);
  text-decoration: underline;
  text-decoration-color: rgba(43,108,176,0.3);
  text-underline-offset: 2px;
  transition: text-decoration-color 0.15s;
}

.legal-body a:hover {
  text-decoration-color: var(--color-primary-light);
}

.legal-body strong {
  color: var(--color-text);
  font-weight: 600;
}

/* ===== Mobile Nav Open ===== */
.nav-links.open {
  display: flex;
}

/* ===== Responsive ===== */
@media (max-width: 900px) {
  .hero-grid {
    grid-template-columns: 1fr;
    gap: 40px;
    text-align: center;
  }

  .hero-text h1 {
    font-size: 2rem;
  }

  .hero-sub {
    margin-left: auto;
    margin-right: auto;
  }

  .hero-phones {
    justify-content: center;
  }

  .phone-main {
    width: 220px;
  }

  .phone-secondary {
    width: 190px;
  }

  .features-grid {
    grid-template-columns: 1fr 1fr;
  }

  .tabs-grid {
    grid-template-columns: 1fr 1fr;
  }

  .class-tables {
    grid-template-columns: 1fr;
  }

  .tips-grid {
    grid-template-columns: 1fr 1fr;
  }

  .export-grid {
    grid-template-columns: 1fr;
  }

  .export-text h2 {
    text-align: center;
  }

  .export-text p {
    text-align: center;
  }

  .export-formats {
    justify-content: center;
  }
}

@media (max-width: 640px) {
  .nav-links {
    display: none;
    position: absolute;
    top: 60px;
    left: 0;
    right: 0;
    background: #fff;
    flex-direction: column;
    padding: 20px 24px;
    gap: 16px;
    border-bottom: 1px solid var(--color-border);
    box-shadow: var(--shadow-md);
  }

  .nav-links.open {
    display: flex;
  }

  .nav-mobile-toggle {
    display: flex;
  }

  .hero-text h1 {
    font-size: 1.75rem;
  }

  .hero-sub {
    font-size: 1rem;
  }

  .phone-main {
    width: 200px;
  }

  .phone-secondary {
    width: 170px;
    margin-left: -30px;
    margin-top: 40px;
  }

  .features-grid,
  .tabs-grid,
  .tips-grid {
    grid-template-columns: 1fr;
  }

  .features h2,
  .how-it-works h2,
  .classification h2,
  .health-tips h2,
  .export-section h2 {
    font-size: 1.5rem;
  }

  .cta-inner h2 {
    font-size: 1.5rem;
  }

  .footer-top {
    flex-direction: column;
    gap: 16px;
    align-items: flex-start;
  }
}