/**
 * 星亿美牙 — static, zero deps (aligned with life / xy-science site patterns)
 * Tech-white clinical palette
 */

:root {
  --color-primary: #3d6a9e;
  --color-primary-dark: #2d4f78;
  --color-text: #1a2332;
  --color-text-muted: #5a6578;
  --color-bg: #f6f8fc;
  --color-card: #ffffff;
  --color-card-border: rgba(45, 79, 120, 0.12);
  --shadow-card: 0 12px 40px rgba(26, 35, 50, 0.06);
  --radius-lg: 18px;
  --radius-md: 12px;
  --maxw: 1120px;
  --font-sans: "Segoe UI", system-ui, -apple-system, BlinkMacSystemFont, "PingFang SC",
    "Hiragino Sans GB", "Microsoft YaHei", sans-serif;
  --fixed-cta-h: 64px;
}

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

html {
  scroll-behavior: smooth;
}

body {
  margin: 0;
  font-family: var(--font-sans);
  color: var(--color-text);
  background-color: var(--color-bg);
  line-height: 1.65;
  font-size: 16px;
  padding-bottom: calc(var(--fixed-cta-h) + env(safe-area-inset-bottom, 0px) + 12px);
}

body::before {
  content: "";
  position: fixed;
  inset: 0;
  z-index: -2;
  pointer-events: none;
  background-color: var(--color-bg);
}

.bg-pattern {
  position: fixed;
  inset: 0;
  z-index: -3;
  width: 100%;
  height: 100%;
  object-fit: cover;
  pointer-events: none;
  opacity: 0.55;
  border-radius: 0;
}

body::after {
  content: "";
  position: fixed;
  inset: 0;
  z-index: -1;
  pointer-events: none;
  background: radial-gradient(1000px 520px at 8% -8%, rgba(61, 106, 158, 0.07), transparent 55%),
    radial-gradient(800px 480px at 100% 0%, rgba(255, 255, 255, 0.9), transparent 45%);
}

img {
  max-width: 100%;
  height: auto;
  display: block;
  border-radius: var(--radius-md);
}

img.bg-pattern,
img.logo {
  border-radius: 0;
}

a {
  color: var(--color-primary-dark);
  text-decoration-thickness: 1px;
  text-underline-offset: 3px;
}

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

.skip-link {
  position: absolute;
  left: -999px;
  top: 8px;
  background: var(--color-card);
  padding: 0.5rem 1rem;
  border-radius: 8px;
  z-index: 100;
  box-shadow: var(--shadow-card);
}

.skip-link:focus {
  left: 12px;
}

.site-header {
  position: sticky;
  top: 0;
  z-index: 50;
  backdrop-filter: blur(12px);
  background: rgba(255, 255, 255, 0.92);
  border-bottom: 1px solid var(--color-card-border);
}

.header-inner {
  max-width: var(--maxw);
  margin: 0 auto;
  padding: 0.75rem 1.25rem;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 1rem;
}

.brand {
  display: flex;
  align-items: center;
  gap: 0.65rem;
  font-weight: 700;
  letter-spacing: 0.02em;
  color: var(--color-text);
  text-decoration: none;
}

.brand .logo {
  width: auto;
  height: 40px;
  max-height: 44px;
  object-fit: contain;
  flex-shrink: 0;
}

.brand small {
  display: block;
  font-weight: 500;
  font-size: 0.72rem;
  color: var(--color-text-muted);
  letter-spacing: 0.04em;
}

.nav-toggle {
  display: none;
  border: 1px solid var(--color-card-border);
  background: #fff;
  border-radius: 10px;
  padding: 0.45rem 0.65rem;
  cursor: pointer;
}

.site-nav {
  display: flex;
  align-items: center;
  gap: 0.35rem 0.65rem;
  flex-wrap: wrap;
  justify-content: flex-end;
}

.site-nav a {
  color: var(--color-text-muted);
  text-decoration: none;
  font-size: 0.82rem;
  padding: 0.3rem 0.45rem;
  border-radius: 8px;
}

.site-nav a:hover {
  background: rgba(61, 106, 158, 0.08);
  color: var(--color-text);
}

.lang-switch {
  display: inline-flex;
  border: 1px solid var(--color-card-border);
  border-radius: 999px;
  overflow: hidden;
  margin-left: 0.25rem;
}

.lang-switch button {
  border: 0;
  background: #fff;
  padding: 0.35rem 0.75rem;
  font-size: 0.82rem;
  cursor: pointer;
  color: var(--color-text-muted);
}

.lang-switch button.is-active {
  background: rgba(61, 106, 158, 0.12);
  color: var(--color-text);
  font-weight: 600;
}

main {
  max-width: var(--maxw);
  margin: 0 auto;
  padding: 0 1.25rem 2rem;
}

.section {
  padding: 3rem 0;
  scroll-margin-top: 88px;
}

.section-head {
  margin-bottom: 1.75rem;
}

.section-kicker {
  font-size: 0.8rem;
  text-transform: uppercase;
  letter-spacing: 0.12em;
  color: var(--color-primary);
  font-weight: 700;
  margin: 0 0 0.35rem;
}

.section-title {
  font-size: clamp(1.55rem, 2.4vw, 2rem);
  margin: 0 0 0.5rem;
  line-height: 1.25;
  color: var(--color-text);
}

.section-lead {
  margin: 0;
  color: var(--color-text-muted);
  max-width: 72ch;
}

.card {
  background: var(--color-card);
  border-radius: var(--radius-lg);
  border: 1px solid var(--color-card-border);
  box-shadow: var(--shadow-card);
  padding: 1.35rem 1.5rem;
}

.hero {
  padding-top: 2.25rem;
}

.hero-grid {
  display: grid;
  grid-template-columns: minmax(0, 1.05fr) minmax(0, 0.95fr);
  gap: 2rem;
  align-items: center;
}

.hero h1 {
  font-size: clamp(1.75rem, 3vw, 2.35rem);
  line-height: 1.22;
  margin: 0 0 1rem;
}

.hero .subtitle {
  font-size: 1.05rem;
  color: var(--color-text-muted);
  margin: 0 0 1rem;
}

.hero .lead {
  margin: 0 0 1.5rem;
  color: var(--color-text-muted);
}

.hero-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 0.75rem;
}

.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  padding: 0.65rem 1.15rem;
  border-radius: 999px;
  font-weight: 600;
  font-size: 0.95rem;
  border: 1px solid transparent;
  cursor: pointer;
  text-decoration: none;
}

.btn-primary {
  background: linear-gradient(135deg, var(--color-primary), var(--color-primary-dark));
  color: #fff;
  box-shadow: 0 10px 26px rgba(45, 79, 120, 0.22);
}

.btn-primary:hover {
  filter: brightness(1.04);
  color: #fff;
}

.btn-ghost {
  background: #fff;
  border-color: var(--color-card-border);
  color: var(--color-text);
}

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

.btn-secondary {
  background: #fff;
  border: 2px solid var(--color-primary-dark);
  color: var(--color-primary-dark);
}

.btn-secondary:hover {
  background: rgba(61, 106, 158, 0.08);
  color: var(--color-text);
}

.media-placeholder {
  border-radius: var(--radius-lg);
  overflow: hidden;
  border: 1px solid var(--color-card-border);
  box-shadow: var(--shadow-card);
  background: #fff;
}

.hero-banner {
  width: 100%;
  border-radius: var(--radius-lg);
}

/* Full-width image modules: no crop, no stretch */
.image-panel {
  background: var(--color-card);
  border-radius: var(--radius-lg);
  border: 1px solid var(--color-card-border);
  box-shadow: var(--shadow-card);
  padding: 0.65rem;
  display: flex;
  align-items: center;
  justify-content: center;
}

.image-panel img {
  width: 100%;
  height: auto;
  max-height: min(88vh, 820px);
  object-fit: contain;
  border-radius: var(--radius-md);
}

.image-panel figcaption {
  margin-top: 0.65rem;
  font-size: 0.88rem;
  color: var(--color-text-muted);
  text-align: center;
}

.ba-grid {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 1.25rem;
}

/* Cases: two-up comparison, no captions */
.section--cases {
  padding-top: 2rem;
  padding-bottom: 2rem;
}

.case-container {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 1.25rem;
  align-items: center;
}

.case-container img {
  width: 100%;
  height: auto;
  max-height: min(90vh, 920px);
  object-fit: contain;
  border-radius: var(--radius-lg);
  border: 1px solid var(--color-card-border);
  box-shadow: var(--shadow-card);
  background: #fff;
}

.grid-2 {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 1.25rem;
}

.grid-3 {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 1.25rem;
}

.grid-4 {
  display: grid;
  grid-template-columns: repeat(4, minmax(0, 1fr));
  gap: 1rem;
}

.grid-5 {
  display: grid;
  grid-template-columns: repeat(5, minmax(0, 1fr));
  gap: 1rem;
}

.process-row {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 1.25rem;
  align-items: stretch;
}

.process-card h3 {
  margin: 0 0 0.5rem;
  font-size: 1.05rem;
}

.process-card p {
  margin: 0;
  color: var(--color-text-muted);
  font-size: 0.93rem;
}

.process-arrow {
  text-align: center;
  font-size: 1.5rem;
  color: var(--color-primary);
  margin: 0.25rem 0 0;
  font-weight: 300;
}

.card h3 {
  margin: 0 0 0.5rem;
  font-size: 1.05rem;
}

.card p {
  margin: 0;
  color: var(--color-text-muted);
  font-size: 0.94rem;
}

.tag {
  display: inline-block;
  font-size: 0.72rem;
  font-weight: 700;
  letter-spacing: 0.06em;
  text-transform: uppercase;
  color: var(--color-primary-dark);
  background: rgba(61, 106, 158, 0.1);
  padding: 0.2rem 0.55rem;
  border-radius: 999px;
  margin-bottom: 0.5rem;
}

.list-plain {
  margin: 0;
  padding-left: 1.1rem;
  color: var(--color-text-muted);
}

.list-plain li + li {
  margin-top: 0.35rem;
}

.table-lite {
  width: 100%;
  border-collapse: collapse;
  font-size: 0.92rem;
}

.table-lite th,
.table-lite td {
  padding: 0.75rem 0.85rem;
  text-align: left;
  border-bottom: 1px solid rgba(26, 35, 50, 0.06);
  vertical-align: top;
}

.table-lite th {
  width: 18%;
  min-width: 5.5rem;
  color: var(--color-text);
  font-weight: 700;
  background: rgba(61, 106, 158, 0.06);
}

.table-lite td {
  width: 41%;
}

.table-lite tr:last-child td,
.table-lite tr:last-child th {
  border-bottom: 0;
}

.quote-block {
  font-size: 1.15rem;
  font-weight: 600;
  color: var(--color-text);
  margin: 0 0 0.75rem;
}

.disclaimer-box {
  border-left: 4px solid var(--color-primary);
  padding: 1rem 1.1rem;
  background: rgba(61, 106, 158, 0.06);
  border-radius: 0 var(--radius-md) var(--radius-md) 0;
}

.disclaimer-box p {
  margin: 0.35rem 0 0;
  font-size: 0.88rem;
  color: var(--color-text-muted);
}

.disclaimer-box strong {
  display: block;
  color: var(--color-text);
  font-size: 0.95rem;
}

.site-footer {
  border-top: 1px solid var(--color-card-border);
  background: rgba(255, 255, 255, 0.96);
  padding: 1.75rem 1.25rem 2rem;
}

.footer-inner {
  max-width: var(--maxw);
  margin: 0 auto;
}

.footer-copy {
  margin-top: 1rem;
  font-size: 0.85rem;
  color: var(--color-text-muted);
}

/* Fixed bottom CTA — module 11 */
.fixed-cta {
  position: fixed;
  left: 0;
  right: 0;
  bottom: 0;
  z-index: 70;
  padding: 0.55rem 1rem calc(0.55rem + env(safe-area-inset-bottom, 0px));
  background: rgba(255, 255, 255, 0.94);
  border-top: 1px solid var(--color-card-border);
  backdrop-filter: blur(14px);
  box-shadow: 0 -8px 30px rgba(26, 35, 50, 0.06);
}

.fixed-cta-inner {
  max-width: var(--maxw);
  margin: 0 auto;
  display: flex;
  flex-wrap: wrap;
  gap: 0.65rem;
  justify-content: center;
  align-items: center;
}

.fixed-cta .btn {
  min-width: 8.5rem;
}

@media (max-width: 960px) {
  .hero-grid {
    grid-template-columns: 1fr;
  }

  .grid-3,
  .grid-4,
  .grid-5 {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }

  .process-row {
    grid-template-columns: 1fr;
  }

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

  .case-container {
    grid-template-columns: 1fr;
  }
}

@media (max-width: 720px) {
  .nav-toggle {
    display: inline-flex;
  }

  .site-nav {
    position: absolute;
    left: 0;
    right: 0;
    top: 100%;
    padding: 0.75rem 1.25rem 1rem;
    background: rgba(255, 255, 255, 0.98);
    border-bottom: 1px solid var(--color-card-border);
    flex-direction: column;
    align-items: stretch;
    display: none;
  }

  .site-nav.is-open {
    display: flex;
  }

  .header-inner {
    position: relative;
    flex-wrap: wrap;
  }

  .lang-switch {
    margin-left: 0;
  }

  .grid-4,
  .grid-5 {
    grid-template-columns: 1fr;
  }

  .table-lite th {
    width: 34%;
  }
}