/* 上海珩之科技 — VISIOWORKS MEDICAL GROUP */
:root {
  --bg: #eef2f5;
  --bg-soft: #f7f9fb;
  --surface: #ffffff;
  --ink: #14202b;
  --ink-soft: #5c6b78;
  --brand: #c12b22;
  --brand-deep: #8f1d18;
  --steel: #3a5a73;
  --accent: #d4572a;
  --line: rgba(20, 32, 43, 0.1);
  --shadow: 0 18px 50px rgba(20, 32, 43, 0.08);
  --radius: 2px;
  --nav-h: 76px;
  --font-display: "Fraunces", "Noto Serif SC", serif;
  --font-body: "Outfit", "Noto Sans SC", sans-serif;
  --ease: cubic-bezier(0.22, 1, 0.36, 1);
}

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

html {
  scroll-behavior: smooth;
}

body {
  margin: 0;
  font-family: var(--font-body);
  color: var(--ink);
  background:
    radial-gradient(1200px 600px at 10% -10%, rgba(193, 43, 34, 0.07), transparent 55%),
    radial-gradient(900px 500px at 100% 0%, rgba(58, 90, 115, 0.08), transparent 50%),
    linear-gradient(180deg, #f4f7fa 0%, var(--bg) 40%, #e8eef3 100%);
  line-height: 1.65;
  overflow-x: hidden;
}

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

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

button,
input,
textarea {
  font: inherit;
}

.container {
  width: min(1120px, calc(100% - 40px));
  margin-inline: auto;
}

/* ---------- Nav ---------- */
.site-header {
  position: fixed;
  inset: 0 0 auto;
  z-index: 100;
  height: var(--nav-h);
  display: flex;
  align-items: center;
  transition: background 0.35s var(--ease), box-shadow 0.35s var(--ease), backdrop-filter 0.35s;
}

.site-header.is-scrolled,
.site-header.is-solid {
  background: rgba(247, 249, 251, 0.92);
  backdrop-filter: blur(14px);
  box-shadow: 0 1px 0 var(--line);
}

.site-header.is-transparent:not(.is-scrolled) {
  background: transparent;
  color: #fff;
}

.site-header.is-transparent:not(.is-scrolled) .brand-cn,
.site-header.is-transparent:not(.is-scrolled) .nav-links a {
  color: #fff;
}

.site-header.is-transparent:not(.is-scrolled) .brand-en {
  color: rgba(255, 255, 255, 0.72);
}

.nav-inner {
  width: min(1180px, calc(100% - 40px));
  margin-inline: auto;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 24px;
}

.brand {
  display: flex;
  flex-direction: column;
  gap: 2px;
  min-width: 0;
}

.brand-cn {
  font-family: var(--font-display);
  font-size: clamp(1.05rem, 1.8vw, 1.35rem);
  font-weight: 650;
  letter-spacing: 0.02em;
  line-height: 1.2;
  color: var(--ink);
}

.brand-en {
  font-size: 0.68rem;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: var(--ink-soft);
  white-space: nowrap;
}

.nav-links {
  display: flex;
  align-items: center;
  gap: 4px;
  list-style: none;
  margin: 0;
  padding: 0;
}

.nav-links a {
  display: block;
  padding: 10px 14px;
  font-size: 0.92rem;
  color: var(--ink-soft);
  position: relative;
  transition: color 0.25s;
}

.nav-links a::after {
  content: "";
  position: absolute;
  left: 14px;
  right: 14px;
  bottom: 6px;
  height: 2px;
  background: var(--brand);
  transform: scaleX(0);
  transform-origin: left;
  transition: transform 0.3s var(--ease);
}

.nav-links a:hover,
.nav-links a.is-active {
  color: var(--brand);
}

.nav-links a.is-active::after,
.nav-links a:hover::after {
  transform: scaleX(1);
}

.nav-cta {
  margin-left: 8px;
  background: var(--brand) !important;
  color: #fff !important;
  padding: 10px 18px !important;
  border-radius: 999px;
}

.nav-cta::after {
  display: none !important;
}

.nav-cta:hover {
  background: var(--brand-deep) !important;
  color: #fff !important;
}

.nav-toggle {
  display: none;
  width: 44px;
  height: 44px;
  border: 1px solid var(--line);
  background: rgba(255, 255, 255, 0.5);
  border-radius: 10px;
  cursor: pointer;
  align-items: center;
  justify-content: center;
  flex-direction: column;
  gap: 5px;
}

.nav-toggle span {
  width: 18px;
  height: 2px;
  background: currentColor;
  transition: 0.25s;
}

/* ---------- Hero ---------- */
.hero {
  position: relative;
  min-height: 100vh;
  min-height: 100dvh;
  display: grid;
  align-items: end;
  color: #fff;
  overflow: hidden;
}

.hero-media {
  position: absolute;
  inset: 0;
  z-index: 0;
}

.hero-media img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  object-position: center;
  transform: scale(1.04);
  animation: heroZoom 12s var(--ease) both;
}

.hero-media::after {
  content: "";
  position: absolute;
  inset: 0;
  background:
    linear-gradient(90deg, rgba(10, 12, 16, 0.72) 0%, rgba(10, 12, 16, 0.35) 48%, rgba(10, 12, 16, 0.2) 100%),
    linear-gradient(180deg, rgba(10, 12, 16, 0.35) 0%, transparent 35%, rgba(10, 12, 16, 0.78) 100%);
}

.hero-content {
  position: relative;
  z-index: 1;
  width: min(1120px, calc(100% - 40px));
  margin: 0 auto;
  padding: calc(var(--nav-h) + 48px) 0 72px;
}

.hero-brand {
  font-family: var(--font-display);
  font-size: clamp(2.8rem, 8vw, 5.2rem);
  font-weight: 650;
  line-height: 1.05;
  margin: 0 0 18px;
  letter-spacing: 0.04em;
  animation: rise 0.9s var(--ease) both;
}

.hero-brand span {
  display: block;
  font-family: var(--font-body);
  font-size: clamp(0.85rem, 1.6vw, 1rem);
  font-weight: 500;
  letter-spacing: 0.22em;
  text-transform: uppercase;
  opacity: 0.78;
  margin-top: 10px;
}

.hero-lead {
  max-width: 34rem;
  font-size: clamp(1.05rem, 2vw, 1.25rem);
  color: rgba(255, 255, 255, 0.88);
  margin: 0 0 28px;
  animation: rise 0.9s 0.12s var(--ease) both;
}

.hero-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  animation: rise 0.9s 0.22s var(--ease) both;
}

.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  padding: 14px 26px;
  border-radius: 999px;
  border: 1px solid transparent;
  font-weight: 600;
  transition: transform 0.25s var(--ease), background 0.25s, color 0.25s, border-color 0.25s;
}

.btn:hover {
  transform: translateY(-2px);
}

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

.btn-primary:hover {
  background: var(--brand-deep);
}

.btn-ghost {
  background: transparent;
  border-color: rgba(255, 255, 255, 0.45);
  color: #fff;
}

.btn-ghost:hover {
  background: rgba(255, 255, 255, 0.1);
}

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

.btn-outline {
  border-color: var(--line);
  background: var(--surface);
  color: var(--ink);
}

/* ---------- Sections ---------- */
.section {
  padding: clamp(64px, 10vw, 110px) 0;
}

.section-head {
  max-width: 40rem;
  margin-bottom: clamp(36px, 6vw, 56px);
}

.section-head.center {
  text-align: center;
  margin-inline: auto;
}

.eyebrow {
  display: inline-block;
  font-size: 0.78rem;
  letter-spacing: 0.18em;
  text-transform: uppercase;
  color: var(--brand);
  margin-bottom: 12px;
  font-weight: 600;
}

.section-head h2 {
  font-family: var(--font-display);
  font-size: clamp(1.8rem, 4vw, 2.6rem);
  font-weight: 650;
  line-height: 1.2;
  margin: 0 0 14px;
  letter-spacing: 0.02em;
}

.section-head p {
  margin: 0;
  color: var(--ink-soft);
  font-size: 1.05rem;
}

/* Effects */
.effects-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 28px;
}

.effect-item {
  display: grid;
  gap: 16px;
}

.effect-item figure {
  margin: 0;
  overflow: hidden;
  border-radius: var(--radius);
  aspect-ratio: 4 / 3;
  background: #111;
}

.effect-item img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  transition: transform 0.7s var(--ease);
}

.effect-item:hover img {
  transform: scale(1.05);
}

.effect-item h3 {
  margin: 0;
  font-family: var(--font-display);
  font-size: 1.35rem;
  font-weight: 650;
}

.effect-item h3 small {
  display: block;
  margin-top: 4px;
  font-family: var(--font-body);
  font-size: 0.82rem;
  font-weight: 500;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: var(--ink-soft);
}

.effect-item p {
  margin: 0;
  color: var(--ink-soft);
}

/* Statement band */
.statement {
  position: relative;
  min-height: 52vh;
  display: grid;
  place-items: center;
  text-align: center;
  color: #fff;
  overflow: hidden;
}

.statement-bg {
  position: absolute;
  inset: 0;
}

.statement-bg img {
  width: 100%;
  height: 100%;
  object-fit: cover;
}

.statement-bg::after {
  content: "";
  position: absolute;
  inset: 0;
  background: linear-gradient(180deg, rgba(12, 14, 18, 0.55), rgba(12, 14, 18, 0.72));
}

.statement-inner {
  position: relative;
  z-index: 1;
  width: min(900px, calc(100% - 40px));
  padding: 80px 0;
}

.statement h2 {
  font-family: var(--font-display);
  font-size: clamp(1.6rem, 4.2vw, 2.8rem);
  font-weight: 650;
  line-height: 1.35;
  margin: 0;
  text-shadow: 0 8px 30px rgba(0, 0, 0, 0.35);
}

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

.adv-item {
  background: var(--surface);
  border: 1px solid var(--line);
  padding: 28px 24px 32px;
  transition: transform 0.35s var(--ease), box-shadow 0.35s;
}

.adv-item:hover {
  transform: translateY(-4px);
  box-shadow: var(--shadow);
}

.adv-num {
  font-family: var(--font-display);
  font-size: 2.4rem;
  color: var(--brand);
  line-height: 1;
  margin-bottom: 18px;
}

.adv-item img {
  width: min(100%, 220px);
  margin: 0 auto 20px;
}

.adv-item h3 {
  margin: 0 0 10px;
  font-size: 1.15rem;
  font-family: var(--font-display);
}

.adv-item p {
  margin: 0;
  color: var(--ink-soft);
  font-size: 0.98rem;
}

/* Page banner */
.page-banner {
  position: relative;
  min-height: 42vh;
  display: grid;
  align-items: end;
  color: #fff;
  overflow: hidden;
  margin-top: 0;
}

.page-banner-media {
  position: absolute;
  inset: 0;
}

.page-banner-media img {
  width: 100%;
  height: 100%;
  object-fit: cover;
}

.page-banner-media::after {
  content: "";
  position: absolute;
  inset: 0;
  background: linear-gradient(180deg, rgba(12, 14, 18, 0.25), rgba(12, 14, 18, 0.72));
}

.page-banner-content {
  position: relative;
  z-index: 1;
  width: min(1120px, calc(100% - 40px));
  margin: 0 auto;
  padding: calc(var(--nav-h) + 60px) 0 48px;
}

.page-banner h1 {
  font-family: var(--font-display);
  font-size: clamp(2rem, 5vw, 3.2rem);
  margin: 0 0 10px;
  font-weight: 650;
}

.page-banner p {
  margin: 0;
  max-width: 36rem;
  color: rgba(255, 255, 255, 0.85);
}

/* About / content */
.prose {
  display: grid;
  gap: 18px;
  color: var(--ink-soft);
  font-size: 1.05rem;
}

.prose h3 {
  margin: 12px 0 0;
  color: var(--ink);
  font-family: var(--font-display);
  font-size: 1.35rem;
}

.split {
  display: grid;
  grid-template-columns: 1.05fr 0.95fr;
  gap: clamp(28px, 5vw, 56px);
  align-items: center;
}

.split.reverse {
  grid-template-columns: 0.95fr 1.05fr;
}

.split-media {
  overflow: hidden;
  border-radius: var(--radius);
  min-height: 320px;
  background: #111;
}

.split-media img {
  width: 100%;
  height: 100%;
  min-height: 320px;
  object-fit: cover;
}

.specs {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 16px;
  margin-top: 28px;
}

.spec {
  background: var(--surface);
  border-top: 3px solid var(--brand);
  padding: 20px 18px;
  border: 1px solid var(--line);
  border-top: 3px solid var(--brand);
}

.spec strong {
  display: block;
  font-family: var(--font-display);
  font-size: 1.55rem;
  color: var(--ink);
  margin-bottom: 6px;
}

.spec span {
  color: var(--ink-soft);
  font-size: 0.92rem;
}

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

.compare img {
  width: 100%;
  border: 1px solid var(--line);
  background: #fff;
}

.tech-list {
  display: grid;
  gap: 18px;
  margin: 0;
  padding: 0;
  list-style: none;
}

.tech-list li {
  display: grid;
  grid-template-columns: 48px 1fr;
  gap: 16px;
  align-items: start;
  padding: 18px 0;
  border-bottom: 1px solid var(--line);
}

.tech-list .idx {
  width: 48px;
  height: 48px;
  border-radius: 50%;
  display: grid;
  place-items: center;
  background: rgba(193, 43, 34, 0.1);
  color: var(--brand);
  font-family: var(--font-display);
  font-weight: 650;
}

.tech-list h3 {
  margin: 0 0 6px;
  font-size: 1.15rem;
}

.tech-list p {
  margin: 0;
  color: var(--ink-soft);
}

/* Contact */
.contact-grid {
  display: grid;
  grid-template-columns: 0.9fr 1.1fr;
  gap: 36px;
  align-items: start;
}

.contact-card {
  background: var(--surface);
  border: 1px solid var(--line);
  padding: 28px;
}

.contact-card h3 {
  margin: 0 0 18px;
  font-family: var(--font-display);
  font-size: 1.4rem;
}

.contact-list {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  gap: 16px;
}

.contact-list li {
  display: grid;
  gap: 4px;
}

.contact-list .label {
  font-size: 0.78rem;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: var(--ink-soft);
}

.contact-list a {
  color: var(--brand);
  font-weight: 600;
}

.map-wrap {
  overflow: hidden;
  border: 1px solid var(--line);
  background: #fff;
}

.map-wrap img {
  width: 100%;
  height: auto;
}

.form {
  display: grid;
  gap: 14px;
}

.form label {
  display: grid;
  gap: 6px;
  font-size: 0.92rem;
  color: var(--ink-soft);
}

.form input,
.form textarea {
  width: 100%;
  border: 1px solid var(--line);
  background: var(--bg-soft);
  padding: 12px 14px;
  border-radius: 4px;
  color: var(--ink);
  outline: none;
  transition: border-color 0.2s, box-shadow 0.2s;
}

.form input:focus,
.form textarea:focus {
  border-color: rgba(193, 43, 34, 0.45);
  box-shadow: 0 0 0 3px rgba(193, 43, 34, 0.12);
}

.form textarea {
  min-height: 140px;
  resize: vertical;
}

.form-note {
  font-size: 0.85rem;
  color: var(--ink-soft);
  margin: 0;
}

/* CTA band */
.cta-band {
  background:
    linear-gradient(135deg, rgba(193, 43, 34, 0.94), rgba(142, 29, 24, 0.94)),
    url("../img/4.jpg") center / cover;
  color: #fff;
  text-align: center;
  padding: 72px 20px;
}

.cta-band h2 {
  font-family: var(--font-display);
  font-size: clamp(1.7rem, 3.5vw, 2.4rem);
  margin: 0 0 12px;
}

.cta-band p {
  margin: 0 0 24px;
  opacity: 0.9;
}

.cta-band .btn-ghost {
  border-color: rgba(255, 255, 255, 0.55);
}

/* Footer */
.site-footer {
  background: #121820;
  color: rgba(255, 255, 255, 0.78);
  padding: 48px 0 36px;
}

.footer-inner {
  display: grid;
  gap: 18px;
  text-align: center;
}

.footer-brand {
  font-family: var(--font-display);
  color: #fff;
  font-size: 1.2rem;
}

.footer-meta {
  font-size: 0.95rem;
  line-height: 1.9;
}

.footer-meta a {
  color: #fff;
}

.footer-copy {
  font-size: 0.82rem;
  opacity: 0.65;
  margin-top: 8px;
}

/* Reveal */
.reveal {
  opacity: 0;
  transform: translateY(28px);
  transition: opacity 0.8s var(--ease), transform 0.8s var(--ease);
}

.reveal.is-in {
  opacity: 1;
  transform: none;
}

@keyframes rise {
  from {
    opacity: 0;
    transform: translateY(24px);
  }
  to {
    opacity: 1;
    transform: none;
  }
}

@keyframes heroZoom {
  from {
    transform: scale(1.1);
  }
  to {
    transform: scale(1.04);
  }
}

/* ---------- Responsive ---------- */
@media (max-width: 920px) {
  .effects-grid,
  .adv-grid,
  .specs,
  .split,
  .split.reverse,
  .contact-grid {
    grid-template-columns: 1fr;
  }

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

  .nav-links {
    position: fixed;
    inset: var(--nav-h) 16px auto;
    background: rgba(247, 249, 251, 0.98);
    border: 1px solid var(--line);
    border-radius: 14px;
    flex-direction: column;
    align-items: stretch;
    padding: 12px;
    gap: 2px;
    box-shadow: var(--shadow);
    opacity: 0;
    pointer-events: none;
    transform: translateY(-8px);
    transition: 0.25s var(--ease);
  }

  .nav-links.is-open {
    opacity: 1;
    pointer-events: auto;
    transform: none;
  }

  .nav-links a {
    color: var(--ink) !important;
    padding: 14px 16px;
  }

  .nav-cta {
    margin-left: 0;
    text-align: center;
  }

  .site-header.is-transparent:not(.is-scrolled) .nav-toggle {
    color: #fff;
    border-color: rgba(255, 255, 255, 0.35);
    background: rgba(0, 0, 0, 0.2);
  }
}

@media (max-width: 640px) {
  :root {
    --nav-h: 68px;
  }

  .brand-en {
    display: none;
  }

  .hero-content,
  .page-banner-content {
    padding-bottom: 48px;
  }

  .adv-item img {
    width: 160px;
  }
}