/* ===== 腾医云 TengMed Cloud · 腾数网智慧医院演示模板 ===== */
:root {
  --blue: #1e6fd9;
  --blue-deep: #155bb5;
  --teal: #19b8a6;
  --ink: #16283d;
  --ink-soft: #51637a;
  --line: #e2eaf4;
  --bg-soft: #f3f7fc;
  --card: #ffffff;
  --shadow: 0 1.25rem 3rem rgba(22, 53, 90, 0.1);
  --radius: 1.25rem;
  --container: 75rem;
  --font: -apple-system, BlinkMacSystemFont, "Segoe UI", "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", sans-serif;
}

* { margin: 0; padding: 0; box-sizing: border-box; }
html { scroll-behavior: smooth; scroll-padding-top: 5rem; }
body {
  font-family: var(--font);
  color: var(--ink);
  background: #fff;
  line-height: 1.7;
  font-size: 1rem;
  overflow-x: hidden;
}
img { max-width: 100%; display: block; }
a { color: inherit; text-decoration: none; }
button { font-family: inherit; cursor: pointer; border: 0; background: none; }
.container { max-width: var(--container); margin: 0 auto; padding: 0 1.5rem; }
section { padding: 6rem 0; }

.section-head { max-width: 46rem; margin-bottom: 3.5rem; }
.section-tag {
  display: inline-block; font-size: 0.8125rem; font-weight: 700;
  letter-spacing: 0.12em; color: var(--teal); margin-bottom: 0.75rem;
}
.section-head h2, .contact-copy h2, .security-copy h2 {
  font-size: clamp(1.75rem, 3vw, 2.5rem);
  line-height: 1.3; letter-spacing: 0.01em;
}
.section-head p, .contact-copy p, .security-copy p {
  margin-top: 1rem; color: var(--ink-soft);
}

.btn-primary, .btn-ghost {
  display: inline-flex; align-items: center; gap: 0.5rem;
  padding: 0.875rem 1.75rem; border-radius: 0.75rem;
  font-size: 1rem; font-weight: 600; transition: all 0.25s;
}
.btn-primary {
  background: linear-gradient(135deg, var(--blue), var(--blue-deep));
  color: #fff; box-shadow: 0 0.75rem 1.75rem rgba(30, 111, 217, 0.3);
}
.btn-primary:hover { transform: translateY(-2px); box-shadow: 0 1rem 2.25rem rgba(30, 111, 217, 0.38); }
.btn-ghost {
  border: 1px solid var(--line); color: var(--ink); background: #fff;
}
.btn-ghost:hover { border-color: var(--blue); color: var(--blue); }

/* ---------- 顶部导航 ---------- */
.site-header {
  position: fixed; inset: 0 0 auto; z-index: 100;
  background: rgba(255, 255, 255, 0.94);
  border-bottom: 1px solid transparent;
  transition: box-shadow 0.25s, border-color 0.25s;
}
.site-header.scrolled-mode { border-color: var(--line); box-shadow: 0 0.5rem 1.5rem rgba(22, 53, 90, 0.06); }
.header-inner { display: flex; align-items: center; gap: 2rem; height: 4.5rem; }
.brand { display: inline-flex; align-items: center; gap: 0.625rem; }
.brand-mark {
  width: 2.375rem; height: 2.375rem; border-radius: 0.625rem;
  display: grid; place-items: center;
  background: linear-gradient(135deg, var(--blue), var(--teal));
  color: #fff; font-size: 1.125rem;
}
.brand-name { font-weight: 800; font-size: 1.1875rem; line-height: 1.1; display: flex; flex-direction: column; }
.brand-name small { font-size: 0.625rem; font-weight: 600; letter-spacing: 0.14em; color: var(--ink-soft); text-transform: uppercase; }
.main-nav { margin-left: auto; display: flex; align-items: center; gap: 2rem; }
.main-nav > a:not(.nav-cta) {
  font-size: 0.9375rem; font-weight: 500; color: var(--ink-soft);
  transition: color 0.2s; position: relative;
}
.main-nav > a:not(.nav-cta):hover { color: var(--blue); }
.nav-cta {
  padding: 0.5625rem 1.25rem; border-radius: 0.625rem;
  background: linear-gradient(135deg, var(--blue), var(--blue-deep));
  color: #fff; font-size: 0.9375rem; font-weight: 600;
  display: inline-flex; align-items: center; gap: 0.375rem;
  transition: all 0.25s;
}
.nav-cta:hover { transform: translateY(-1px); box-shadow: 0 0.5rem 1.25rem rgba(30, 111, 217, 0.32); }
.menu-toggle {
  display: none; width: 2.75rem; height: 2.75rem; margin-left: auto;
  border-radius: 0.625rem; font-size: 1.375rem; color: var(--ink);
  border: 1px solid var(--line);
}

/* ---------- Hero ---------- */
.hero {
  padding: 10.5rem 0 6.5rem;
  background:
    radial-gradient(48rem 30rem at 85% -10%, rgba(25, 184, 166, 0.1), transparent 60%),
    radial-gradient(40rem 28rem at -10% 20%, rgba(30, 111, 217, 0.1), transparent 60%),
    linear-gradient(180deg, #f6fafe 0%, #fff 100%);
}
.hero-inner { display: grid; grid-template-columns: 1fr 1.05fr; gap: 4rem; align-items: center; }
.hero-badge {
  display: inline-flex; align-items: center; gap: 0.5rem;
  padding: 0.4375rem 1rem; border-radius: 2rem;
  background: rgba(25, 184, 166, 0.1); color: #0e8a7c;
  font-size: 0.8125rem; font-weight: 600; margin-bottom: 1.5rem;
}
.hero h1 {
  font-size: clamp(2.25rem, 4.5vw, 3.5rem);
  line-height: 1.22; letter-spacing: 0.01em;
}
.hero h1 em {
  font-style: normal;
  background: linear-gradient(100deg, var(--blue) 10%, var(--teal) 90%);
  -webkit-background-clip: text; background-clip: text; color: transparent;
}
.hero-sub { margin: 1.5rem 0 2.25rem; color: var(--ink-soft); font-size: 1.0625rem; max-width: 34rem; }
.hero-actions { display: flex; gap: 1rem; flex-wrap: wrap; }
.hero-trust { display: flex; gap: 1.5rem; margin-top: 2.5rem; list-style: none; flex-wrap: wrap; }
.hero-trust li { display: flex; align-items: center; gap: 0.375rem; font-size: 0.875rem; color: var(--ink-soft); }
.hero-trust i { color: var(--teal); }

.hero-visual { position: relative; }
.hero-frame {
  border-radius: var(--radius);
  box-shadow: var(--shadow);
  border: 1px solid var(--line);
}
.hero-chip {
  position: absolute; display: flex; align-items: center; gap: 0.75rem;
  background: #fff; border: 1px solid var(--line); border-radius: 1rem;
  padding: 0.75rem 1.125rem; box-shadow: 0 0.75rem 1.75rem rgba(22, 53, 90, 0.12);
}
.hero-chip > i {
  width: 2.25rem; height: 2.25rem; border-radius: 0.625rem;
  display: grid; place-items: center; color: #fff; font-size: 1.0625rem;
  background: linear-gradient(135deg, var(--blue), var(--teal));
  flex-shrink: 0;
}
.hero-chip b { display: block; font-size: 0.8125rem; color: var(--ink-soft); font-weight: 500; line-height: 1.3; }
.hero-chip span { font-size: 0.9375rem; font-weight: 700; }
.chip-a { top: 8%; left: -2.5rem; animation: float-a 6s ease-in-out infinite; }
.chip-b { bottom: 22%; right: -1.75rem; animation: float-b 7s ease-in-out infinite; }
.chip-c { bottom: -1.5rem; left: 14%; animation: float-c 8s ease-in-out infinite; }
@keyframes float-a { 0%, 100% { transform: translateY(0); } 50% { transform: translateY(-0.75rem); } }
@keyframes float-b { 0%, 100% { transform: translateY(0); } 50% { transform: translateY(0.625rem); } }
@keyframes float-c { 0%, 100% { transform: translateY(0); } 50% { transform: translateY(-0.5rem); } }

/* ---------- 信任数字带 ---------- */
.trust { padding: 0; }
.trust-grid {
  display: grid; grid-template-columns: repeat(4, 1fr);
  background: linear-gradient(120deg, var(--blue) 0%, #1a7fd4 55%, var(--teal) 100%);
  border-radius: var(--radius);
  padding: 2.75rem 2rem;
  transform: translateY(-0.01rem);
}
.trust-item { text-align: center; color: #fff; position: relative; }
.trust-item + .trust-item::before {
  content: ""; position: absolute; left: 0; top: 50%; transform: translateY(-50%);
  width: 1px; height: 3.5rem; background: rgba(255, 255, 255, 0.25);
}
.trust-item b { font-size: clamp(1.75rem, 3vw, 2.625rem); font-weight: 800; line-height: 1.1; display: block; }
.trust-item b i { font-style: normal; font-size: 0.6em; margin-left: 0.125rem; }
.trust-item > span { font-size: 0.875rem; opacity: 0.85; }

/* ---------- 平台架构 ---------- */
.platform { background: var(--bg-soft); }
.arch { max-width: 62rem; margin: 0 auto; }
.arch-layer { display: grid; grid-template-columns: 8.5rem 1fr; gap: 1.5rem; align-items: center; }
.arch-label {
  font-size: 0.875rem; font-weight: 700; color: var(--ink-soft);
  text-align: right; letter-spacing: 0.06em;
}
.arch-row { display: grid; grid-auto-flow: column; grid-auto-columns: 1fr; gap: 1rem; }
.arch-app, .arch-core, .arch-base {
  background: #fff; border: 1px solid var(--line); border-radius: 1rem;
  padding: 1.25rem 1rem; text-align: center;
  display: flex; flex-direction: column; align-items: center; gap: 0.25rem;
  transition: transform 0.25s, box-shadow 0.25s, border-color 0.25s;
}
.arch-app:hover, .arch-core:hover, .arch-base:hover {
  transform: translateY(-0.25rem); box-shadow: var(--shadow); border-color: rgba(30, 111, 217, 0.4);
}
.arch-app i, .arch-core i, .arch-base i {
  font-size: 1.375rem; margin-bottom: 0.375rem;
  background: linear-gradient(135deg, var(--blue), var(--teal));
  -webkit-background-clip: text; background-clip: text; color: transparent;
}
.arch-app b, .arch-core b, .arch-base b { font-size: 1rem; }
.arch-app span, .arch-core span, .arch-base span { font-size: 0.8125rem; color: var(--ink-soft); line-height: 1.5; }
.arch-core { background: linear-gradient(150deg, #fff, #f0f7ff); border-color: rgba(30, 111, 217, 0.28); }
.arch-base { background: linear-gradient(150deg, #fff, #effcf9); border-color: rgba(25, 184, 166, 0.3); }
.arch-join { display: flex; justify-content: space-around; padding: 0.375rem 0 0.375rem 10rem; }
.arch-join i {
  width: 0.375rem; height: 1.5rem; border-radius: 1rem;
  background: linear-gradient(180deg, rgba(30, 111, 217, 0.5), rgba(25, 184, 166, 0.5));
}

/* ---------- 临床工作站 ---------- */
.tab-list {
  display: inline-flex; gap: 0.5rem; padding: 0.375rem;
  background: var(--bg-soft); border-radius: 0.875rem; margin-bottom: 2.5rem;
}
.tab-btn {
  padding: 0.625rem 1.5rem; border-radius: 0.625rem;
  font-size: 0.9375rem; font-weight: 600; color: var(--ink-soft);
  transition: all 0.25s;
}
.tab-btn.active-mode {
  background: #fff; color: var(--blue);
  box-shadow: 0 0.375rem 1rem rgba(22, 53, 90, 0.1);
}
.tab-panel { display: grid; grid-template-columns: 1.15fr 1fr; gap: 3rem; align-items: center; }
.tab-panel[hidden] { display: none; }

.station-mock {
  border: 1px solid var(--line); border-radius: var(--radius);
  overflow: hidden; box-shadow: var(--shadow); background: #fff;
}
.mock-bar {
  display: flex; align-items: center; gap: 0.375rem;
  padding: 0.75rem 1.25rem; background: var(--bg-soft);
  border-bottom: 1px solid var(--line);
}
.mock-bar i { width: 0.625rem; height: 0.625rem; border-radius: 50%; }
.mock-bar i:nth-child(1) { background: #f1a7a7; }
.mock-bar i:nth-child(2) { background: #f5d68a; }
.mock-bar i:nth-child(3) { background: #9fdcb4; }
.mock-bar span { margin-left: 0.75rem; font-size: 0.8125rem; color: var(--ink-soft); }
.mock-body { display: grid; grid-template-columns: 11rem 1fr; min-height: 15rem; }
.mock-side {
  background: linear-gradient(180deg, #f7fafe, #f2f8fd);
  border-right: 1px solid var(--line); padding: 1rem 0.75rem;
  display: flex; flex-direction: column; gap: 0.5rem;
}
.mock-side span {
  font-size: 0.8125rem; color: var(--ink-soft);
  padding: 0.5rem 0.75rem; border-radius: 0.5rem;
}
.mock-side .on-mode {
  background: #fff; color: var(--blue); font-weight: 600;
  box-shadow: 0 0.25rem 0.75rem rgba(22, 53, 90, 0.08);
  border-left: 3px solid var(--blue);
}
.mock-main { padding: 1.25rem 1.5rem; display: flex; flex-direction: column; gap: 0.875rem; }
.mock-row { display: flex; align-items: center; gap: 0.75rem; font-size: 0.875rem; flex-wrap: wrap; }
.mock-row b {
  flex-shrink: 0; width: 2.625rem; font-size: 0.75rem; color: var(--ink-soft);
  font-weight: 600;
}
.mock-row > span { color: var(--ink); }
.tag-blue, .tag-teal {
  padding: 0.1875rem 0.625rem; border-radius: 2rem;
  font-size: 0.75rem; font-weight: 600;
}
.tag-blue { background: rgba(30, 111, 217, 0.1); color: var(--blue); }
.tag-teal { background: rgba(25, 184, 166, 0.12); color: #0e8a7c; }

.station-feats { list-style: none; display: flex; flex-direction: column; gap: 1.75rem; }
.station-feats li { display: flex; gap: 1.125rem; }
.station-feats > li > i {
  flex-shrink: 0; width: 3rem; height: 3rem; border-radius: 0.875rem;
  display: grid; place-items: center; font-size: 1.25rem; color: #fff;
  background: linear-gradient(135deg, var(--blue), var(--teal));
  box-shadow: 0 0.5rem 1.25rem rgba(30, 111, 217, 0.25);
}
.station-feats b { display: block; font-size: 1.0625rem; margin-bottom: 0.25rem; }
.station-feats span { font-size: 0.9375rem; color: var(--ink-soft); }

/* ---------- 智慧服务 ---------- */
.operation { background: var(--bg-soft); }
.op-grid { display: grid; grid-template-columns: repeat(4, 1fr); gap: 1.5rem; }
.op-card {
  background: #fff; border: 1px solid var(--line); border-radius: var(--radius);
  padding: 2rem 1.5rem; transition: transform 0.25s, box-shadow 0.25s, border-color 0.25s;
}
.op-card:hover {
  transform: translateY(-0.375rem); box-shadow: var(--shadow);
  border-color: rgba(25, 184, 166, 0.45);
}
.op-card i {
  display: grid; place-items: center;
  width: 3.25rem; height: 3.25rem; border-radius: 0.875rem;
  font-size: 1.375rem; color: var(--teal);
  background: rgba(25, 184, 166, 0.1); margin-bottom: 1.25rem;
}
.op-card b { display: block; font-size: 1.125rem; margin-bottom: 0.5rem; }
.op-card span { font-size: 0.9375rem; color: var(--ink-soft); }

/* ---------- 安全合规 ---------- */
.security-inner { display: grid; grid-template-columns: 1fr 1.1fr; gap: 4.5rem; align-items: center; }
.security-points { list-style: none; margin-top: 1.75rem; display: flex; flex-direction: column; gap: 0.875rem; }
.security-points li { display: flex; align-items: center; gap: 0.625rem; font-size: 0.9375rem; color: var(--ink-soft); }
.security-points i { color: var(--teal); font-size: 1.0625rem; }
.badge-grid { display: grid; grid-template-columns: 1fr 1fr; gap: 1.25rem; }
.sec-badge {
  background: #fff; border: 1px solid var(--line); border-radius: var(--radius);
  padding: 1.75rem 1.5rem; text-align: center;
  transition: transform 0.25s, box-shadow 0.25s;
}
.sec-badge:hover { transform: translateY(-0.25rem); box-shadow: var(--shadow); }
.sec-badge i {
  font-size: 2rem;
  background: linear-gradient(135deg, var(--blue), var(--teal));
  -webkit-background-clip: text; background-clip: text; color: transparent;
}
.sec-badge b { display: block; font-size: 1.1875rem; margin: 0.75rem 0 0.375rem; }
.sec-badge span { font-size: 0.8125rem; color: var(--ink-soft); }

/* ---------- 标杆案例 ---------- */
.cases { background: linear-gradient(180deg, var(--bg-soft), #fff); }
.case-carousel { max-width: 62rem; margin: 0 auto; }
.case-viewport { overflow: hidden; border-radius: var(--radius); }
.case-track { display: flex; transition: transform 0.55s cubic-bezier(0.22, 0.8, 0.32, 1); }
.case-slide { flex: 0 0 100%; }
.case-main {
  background: #fff; border: 1px solid var(--line); border-radius: var(--radius);
  padding: 3rem 3.5rem; box-shadow: var(--shadow);
}
.case-org {
  display: inline-block; font-size: 0.8125rem; font-weight: 700;
  letter-spacing: 0.08em; color: var(--teal); margin-bottom: 1rem;
}
.case-main h3 { font-size: clamp(1.25rem, 2.2vw, 1.75rem); line-height: 1.4; max-width: 42rem; }
.case-main p { margin: 1.125rem 0 2rem; color: var(--ink-soft); }
.case-nums { display: grid; grid-template-columns: repeat(3, 1fr); gap: 1.5rem; }
.case-nums div {
  border-left: 3px solid var(--teal); padding-left: 1.125rem;
}
.case-nums b {
  display: block; font-size: clamp(1.5rem, 2.5vw, 2.125rem); font-weight: 800;
  background: linear-gradient(120deg, var(--blue), var(--teal));
  -webkit-background-clip: text; background-clip: text; color: transparent;
  line-height: 1.2;
}
.case-nums span { font-size: 0.8125rem; color: var(--ink-soft); }
.case-nav { display: flex; align-items: center; justify-content: center; gap: 1.5rem; margin-top: 2rem; }
.case-nav > button {
  width: 2.75rem; height: 2.75rem; border-radius: 50%;
  border: 1px solid var(--line); background: #fff; color: var(--ink);
  display: grid; place-items: center; font-size: 1rem;
  transition: all 0.25s;
}
.case-nav > button:hover { border-color: var(--blue); color: var(--blue); box-shadow: 0 0.375rem 1rem rgba(30, 111, 217, 0.15); }
.case-dots { display: flex; gap: 0.5rem; }
.case-dots button {
  width: 0.625rem; height: 0.625rem; border-radius: 2rem;
  background: #c9d8ea; transition: all 0.3s;
}
.case-dots button.active-mode { width: 1.75rem; background: linear-gradient(90deg, var(--blue), var(--teal)); }

/* ---------- FAQ ---------- */
.faq-list { max-width: 50rem; }
.faq-item {
  border: 1px solid var(--line); border-radius: 1rem;
  margin-bottom: 1rem; background: #fff;
  transition: border-color 0.25s, box-shadow 0.25s;
}
.faq-item.open-mode { border-color: rgba(30, 111, 217, 0.4); box-shadow: 0 0.75rem 1.75rem rgba(22, 53, 90, 0.08); }
.faq-q {
  width: 100%; display: flex; align-items: center; justify-content: space-between;
  gap: 1rem; padding: 1.25rem 1.5rem;
  font-size: 1rem; font-weight: 600; color: var(--ink); text-align: left;
}
.faq-q i { color: var(--ink-soft); transition: transform 0.3s; flex-shrink: 0; }
.faq-item.open-mode .faq-q i { transform: rotate(180deg); color: var(--blue); }
.faq-a {
  display: grid; grid-template-rows: 0fr;
  transition: grid-template-rows 0.35s ease;
}
.faq-a > p {
  overflow: hidden; padding: 0 1.5rem;
  color: var(--ink-soft); font-size: 0.9375rem;
  transition: padding 0.35s ease;
}
.faq-item.open-mode .faq-a { grid-template-rows: 1fr; }
.faq-item.open-mode .faq-a > p { padding: 0 1.5rem 1.375rem; }

/* ---------- 预约演示 ---------- */
.contact {
  background:
    radial-gradient(40rem 26rem at 90% 10%, rgba(25, 184, 166, 0.22), transparent 60%),
    linear-gradient(140deg, #0f3d7d 0%, #155bb5 60%, #1a7fd4 100%);
  color: #fff;
}
.contact-inner { display: grid; grid-template-columns: 1fr 1.1fr; gap: 4.5rem; align-items: center; }
.contact .section-tag { color: #7fe3d6; }
.contact-copy p { color: rgba(255, 255, 255, 0.78); }
.contact-points { list-style: none; margin-top: 2.25rem; display: flex; flex-direction: column; gap: 1.375rem; }
.contact-points li { display: flex; align-items: center; gap: 1rem; }
.contact-points i {
  flex-shrink: 0; width: 2.75rem; height: 2.75rem; border-radius: 0.75rem;
  display: grid; place-items: center; font-size: 1.125rem;
  background: rgba(255, 255, 255, 0.12); border: 1px solid rgba(255, 255, 255, 0.18);
}
.contact-points b { display: block; font-size: 0.9375rem; }
.contact-points span { font-size: 0.875rem; color: rgba(255, 255, 255, 0.72); }

.contact-form {
  background: #fff; color: var(--ink);
  border-radius: var(--radius); padding: 2.5rem;
  box-shadow: 0 2rem 4rem rgba(8, 30, 60, 0.3);
}
.contact-form h3 { font-size: 1.375rem; margin-bottom: 1.75rem; }
.form-grid { display: grid; grid-template-columns: 1fr 1fr; gap: 1.25rem; }
.contact-form label {
  display: flex; flex-direction: column; gap: 0.4375rem;
  font-size: 0.875rem; font-weight: 600; margin-bottom: 1.25rem;
}
.contact-form label i { color: #e05252; font-style: normal; margin-left: 0.125rem; }
.contact-form input, .contact-form select, .contact-form textarea {
  font-family: inherit; font-size: 0.9375rem; color: var(--ink);
  padding: 0.75rem 1rem; border: 1px solid var(--line); border-radius: 0.625rem;
  background: #fbfdff; transition: border-color 0.2s, box-shadow 0.2s;
  width: 100%; font-weight: 400;
}
.contact-form textarea { resize: vertical; min-height: 4.5rem; }
.contact-form input:focus, .contact-form select:focus, .contact-form textarea:focus {
  outline: none; border-color: var(--blue);
  box-shadow: 0 0 0 3px rgba(30, 111, 217, 0.14);
}
.contact-form label.error-mode input, .contact-form label.error-mode select {
  border-color: #e05252; box-shadow: 0 0 0 3px rgba(224, 82, 82, 0.12);
}
.field-error { font-size: 0.75rem; color: #e05252; font-weight: 400; min-height: 1em; font-style: normal; }
.contact-form .form-submit { width: 100%; justify-content: center; border: 0; font-size: 1rem; }
.contact-form .form-submit:disabled { opacity: 0.75; cursor: default; transform: none; }
.form-status { margin-top: 1rem; font-size: 0.875rem; color: #0e8a7c; font-weight: 600; }

/* ---------- 页脚 ---------- */
.site-footer { background: #0d2240; color: rgba(255, 255, 255, 0.72); padding: 4.5rem 0 0; }
.footer-grid { display: grid; grid-template-columns: 1.6fr 1fr 1fr 1.2fr; gap: 3rem; padding-bottom: 3.5rem; }
.footer-brand .brand-name { color: #fff; }
.footer-brand .brand-name small { color: rgba(255, 255, 255, 0.55); }
.footer-brand p { margin: 1.25rem 0 1rem; font-size: 0.9375rem; max-width: 22rem; }
.footer-note { font-size: 0.75rem; color: rgba(255, 255, 255, 0.4); }
.footer-col { display: flex; flex-direction: column; gap: 0.75rem; font-size: 0.9375rem; }
.footer-col b { color: #fff; font-size: 1rem; margin-bottom: 0.375rem; }
.footer-col a:hover { color: #fff; }
.footer-bar {
  display: flex; justify-content: space-between; gap: 1rem; flex-wrap: wrap;
  padding-top: 1.5rem; padding-bottom: 1.5rem;
  border-top: 1px solid rgba(255, 255, 255, 0.1);
  font-size: 0.8125rem; color: rgba(255, 255, 255, 0.45);
}

/* ---------- 返回顶部 / toast ---------- */
.to-top {
  position: fixed; right: 1.75rem; bottom: 1.75rem; z-index: 90;
  width: 2.875rem; height: 2.875rem; border-radius: 50%;
  background: linear-gradient(135deg, var(--blue), var(--blue-deep));
  color: #fff; font-size: 1.125rem;
  display: grid; place-items: center;
  box-shadow: 0 0.75rem 1.75rem rgba(30, 111, 217, 0.35);
  opacity: 0; visibility: hidden; transform: translateY(0.75rem);
  transition: all 0.3s;
}
.to-top.show-mode { opacity: 1; visibility: visible; transform: translateY(0); }
.to-top:hover { transform: translateY(-0.25rem); }
.toast {
  position: fixed; left: 50%; bottom: 2.5rem; z-index: 200;
  transform: translate(-50%, 1.5rem);
  background: rgba(13, 34, 64, 0.94); color: #fff;
  padding: 0.8125rem 1.5rem; border-radius: 0.75rem;
  font-size: 0.9375rem; box-shadow: 0 1rem 2.5rem rgba(8, 30, 60, 0.35);
  opacity: 0; visibility: hidden; transition: all 0.3s;
  max-width: calc(100vw - 3rem); text-align: center;
}
.toast.show-mode { opacity: 1; visibility: visible; transform: translate(-50%, 0); }

/* ---------- 进场动效 ---------- */
[data-reveal] {
  opacity: 0; transform: translateY(1.75rem);
  transition: opacity 0.7s ease, transform 0.7s ease;
}
[data-reveal].reveal-mode { opacity: 1; transform: none; }

/* ---------- 响应式 ---------- */
@media (max-width: 1200px) {
  .hero-inner { gap: 3rem; }
  .chip-a { left: -0.5rem; }
  .chip-b { right: -0.5rem; }
}

@media (max-width: 992px) {
  section { padding: 4.5rem 0; }
  .menu-toggle { display: grid; place-items: center; }
  .main-nav {
    position: fixed; top: 4.5rem; right: 0; bottom: 0;
    width: min(20rem, 84vw);
    flex-direction: column; align-items: stretch; gap: 0;
    background: #fff; border-left: 1px solid var(--line);
    padding: 1.5rem; box-shadow: -1rem 0 3rem rgba(22, 53, 90, 0.12);
    transform: translateX(100%); transition: transform 0.3s ease;
  }
  .main-nav.menu-open-mode { transform: translateX(0); }
  .main-nav > a:not(.nav-cta) {
    padding: 1rem 0.75rem; border-bottom: 1px solid var(--line);
    font-size: 1.0625rem; color: var(--ink);
  }
  .nav-cta { margin-top: 1.25rem; justify-content: center; padding: 0.875rem 1.25rem; }

  .hero { padding: 8.5rem 0 4.5rem; }
  .hero-inner { grid-template-columns: 1fr; }
  .hero-visual { margin-top: 1rem; }
  .chip-a { left: 1rem; }
  .chip-b { right: 0.5rem; bottom: 30%; }
  .chip-c { left: 8%; bottom: -1.25rem; }

  .trust-grid { grid-template-columns: 1fr 1fr; gap: 2rem 1rem; padding: 2.25rem 1.75rem; }
  .trust-item:nth-child(3)::before { display: none; }

  .arch-layer { grid-template-columns: 1fr; gap: 1rem; }
  .arch-label { text-align: left; }
  .arch-join { display: none; }
  .arch-layer + .arch-join + .arch-layer, .arch-layer + .arch-layer { margin-top: 1.5rem; }
  .arch-row { grid-auto-flow: row; grid-template-columns: repeat(auto-fit, minmax(10rem, 1fr)); }

  .tab-panel { grid-template-columns: 1fr; gap: 2rem; }
  .op-grid { grid-template-columns: 1fr 1fr; }
  .security-inner, .contact-inner { grid-template-columns: 1fr; gap: 3rem; }
  .footer-grid { grid-template-columns: 1fr 1fr; }
}

@media (max-width: 768px) {
  section { padding: 3.5rem 0; }
  .section-head { margin-bottom: 2.5rem; }
  .hero { padding: 7.5rem 0 4rem; }
  .hero-actions .btn-primary, .hero-actions .btn-ghost { flex: 1; justify-content: center; }
  .hero-trust { gap: 1rem; }
  .hero-chip { padding: 0.625rem 0.875rem; }
  .hero-chip > i { width: 1.875rem; height: 1.875rem; font-size: 0.875rem; }
  .chip-c { bottom: -1rem; }

  .trust-grid { border-radius: 1rem; }
  .tab-list { width: 100%; }
  .tab-btn { flex: 1; padding: 0.625rem 0.5rem; font-size: 0.875rem; }
  .mock-body { grid-template-columns: 1fr; }
  .mock-side { flex-direction: row; overflow-x: auto; border-right: 0; border-bottom: 1px solid var(--line); padding: 0.75rem; }
  .mock-side span { white-space: nowrap; }
  .mock-side .on-mode { border-left: 0; border-bottom: 3px solid var(--blue); }

  .op-grid { grid-template-columns: 1fr; }
  .badge-grid { grid-template-columns: 1fr; }
  .case-main { padding: 2rem 1.5rem; }
  .case-nums { grid-template-columns: 1fr; gap: 1rem; }
  .form-grid { grid-template-columns: 1fr; gap: 0; }
  .contact-form { padding: 1.75rem 1.5rem; }
  .footer-grid { grid-template-columns: 1fr; gap: 2rem; }
  .footer-bar { flex-direction: column; gap: 0.375rem; }
  .to-top { right: 1.25rem; bottom: 1.25rem; }
}

@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
  [data-reveal] { opacity: 1; transform: none; transition: none; }
  .chip-a, .chip-b, .chip-c { animation: none; }
  .case-track { transition: none; }
}

/* ---------- visual polish ---------- */
:focus-visible { outline: 3px solid rgba(25, 184, 166, .75); outline-offset: 3px; }
.site-header { backdrop-filter: blur(14px); -webkit-backdrop-filter: blur(14px); }
.hero { isolation: isolate; }
.hero-visual { filter: drop-shadow(0 2rem 3rem rgba(18, 55, 100, .18)); }
.hero-frame { border: 1px solid rgba(255,255,255,.72); box-shadow: 0 1.75rem 4rem rgba(22,53,90,.2); }
.hero-chip { box-shadow: 0 1rem 2.5rem rgba(22,53,90,.16); }
.op-card, .case-slide, .badge-grid > * { transition: transform .3s cubic-bezier(.2,.75,.25,1), box-shadow .3s, border-color .3s; }
.op-card:hover { transform: translateY(-.35rem); box-shadow: 0 1.5rem 3rem rgba(22,53,90,.12); }
.arch-core { box-shadow: 0 1.25rem 3rem rgba(30,111,217,.2); }
@media (max-width: 768px) {
  .hero-visual { filter: drop-shadow(0 1rem 1.5rem rgba(18,55,100,.16)); }
  .hero-chip { box-shadow: 0 .5rem 1.25rem rgba(22,53,90,.14); }
}