/* ============================================
   念易网络科技 - 官网样式
   ============================================ */

/* ---------- 设计变量 ---------- */
:root {
  --c-primary: #4f8cff;
  --c-primary-dark: #2563eb;
  --c-cyan: #00d4ff;
  --c-purple: #a855f7;
  --c-green: #22c55e;
  --c-orange: #f59e0b;
  --c-red: #ef4444;

  --c-bg: #ffffff;
  --c-bg-soft: #f6f8fc;
  --c-bg-dark: #0a0f1f;
  --c-bg-dark-2: #111733;

  --c-text: #0f172a;
  --c-text-soft: #475569;
  --c-text-muted: #94a3b8;
  --c-border: #e6ebf2;

  --grad-primary: linear-gradient(135deg, #4f8cff 0%, #00d4ff 100%);
  --grad-dark: linear-gradient(160deg, #0a0f1f 0%, #131a3a 60%, #0a0f1f 100%);

  --shadow-sm: 0 2px 8px rgba(15, 23, 42, .06);
  --shadow-md: 0 8px 24px rgba(15, 23, 42, .08);
  --shadow-lg: 0 20px 50px rgba(15, 23, 42, .12);
  --shadow-primary: 0 12px 30px rgba(79, 140, 255, .35);

  --radius-sm: 8px;
  --radius-md: 14px;
  --radius-lg: 22px;
  --radius-xl: 30px;

  --container: 1200px;
  --nav-h: 72px;

  --ease: cubic-bezier(.22, 1, .36, 1);
  --ease-out: cubic-bezier(.16, 1, .3, 1);
}

/* ---------- 重置 ---------- */
*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }
html { scroll-behavior: smooth; -webkit-text-size-adjust: 100%; }
body {
  font-family: "PingFang SC", "Microsoft YaHei", "Helvetica Neue", -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, sans-serif;
  font-size: 16px;
  line-height: 1.7;
  color: var(--c-text);
  background: var(--c-bg);
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
  overflow-x: hidden;
}
img { max-width: 100%; display: block; }
a { color: inherit; text-decoration: none; }
ul { list-style: none; }
button { font-family: inherit; cursor: pointer; border: none; background: none; }
input, textarea, select { font-family: inherit; font-size: inherit; }

/* ---------- 容器 ---------- */
.container { width: 100%; max-width: var(--container); margin: 0 auto; padding: 0 24px; }

/* ---------- 滚动进度条 ---------- */
.scroll-progress {
  position: fixed; top: 0; left: 0; height: 3px; width: 0%;
  background: var(--grad-primary); z-index: 1000;
  transition: width .1s linear;
}

/* ---------- 按钮 ---------- */
.btn {
  display: inline-flex; align-items: center; justify-content: center; gap: 8px;
  padding: 12px 26px; border-radius: var(--radius-md);
  font-size: 15px; font-weight: 600; line-height: 1;
  cursor: pointer; transition: all .25s var(--ease);
  white-space: nowrap; border: 1.5px solid transparent;
}
.btn-sm { padding: 9px 18px; font-size: 14px; }
.btn-block { width: 100%; }
.btn-primary { background: var(--grad-primary); color: #fff; box-shadow: var(--shadow-primary); }
.btn-primary:hover { transform: translateY(-2px); box-shadow: 0 16px 36px rgba(79, 140, 255, .45); }
.btn-ghost { background: rgba(255,255,255,.08); color: #fff; border-color: rgba(255,255,255,.25); backdrop-filter: blur(8px); }
.btn-ghost:hover { background: rgba(255,255,255,.16); transform: translateY(-2px); }
.btn-outline { background: transparent; color: var(--c-primary); border-color: var(--c-border); }
.btn-outline:hover { border-color: var(--c-primary); background: rgba(79,140,255,.06); transform: translateY(-2px); }
.btn-light { background: #fff; color: var(--c-text); }
.btn-light:hover { transform: translateY(-2px); box-shadow: var(--shadow-lg); }

/* ---------- 导航 ---------- */
.navbar {
  position: fixed; top: 0; left: 0; right: 0; height: var(--nav-h);
  z-index: 100; transition: all .3s var(--ease);
  background: rgba(255,255,255,.7); backdrop-filter: blur(16px);
  border-bottom: 1px solid transparent;
}
.navbar.scrolled {
  background: rgba(255,255,255,.92);
  border-bottom-color: var(--c-border);
  box-shadow: var(--shadow-sm);
}
.nav-inner { height: 100%; display: flex; align-items: center; justify-content: space-between; gap: 24px; }
.logo { display: flex; align-items: center; gap: 10px; font-weight: 700; }
.logo-mark { display: flex; }
.logo-text { font-size: 19px; color: var(--c-text); letter-spacing: .5px; }
.logo-text-sub { color: var(--c-primary); margin-left: 2px; }
.nav-menu { display: flex; align-items: center; gap: 4px; }
.nav-link {
  padding: 8px 14px; font-size: 15px; color: var(--c-text-soft); font-weight: 500;
  border-radius: var(--radius-sm); transition: all .2s var(--ease); position: relative;
}
.nav-link:hover { color: var(--c-primary); }
.nav-link.active { color: var(--c-primary); }
.nav-link.active::after {
  content: ''; position: absolute; bottom: 2px; left: 50%; transform: translateX(-50%);
  width: 18px; height: 2px; border-radius: 2px; background: var(--grad-primary);
}
.nav-actions { display: flex; align-items: center; gap: 12px; }
.nav-toggle { display: none; flex-direction: column; gap: 5px; padding: 8px; }
.nav-toggle span { width: 22px; height: 2px; background: var(--c-text); border-radius: 2px; transition: all .3s var(--ease); }
.nav-toggle.active span:nth-child(1) { transform: translateY(7px) rotate(45deg); }
.nav-toggle.active span:nth-child(2) { opacity: 0; }
.nav-toggle.active span:nth-child(3) { transform: translateY(-7px) rotate(-45deg); }

/* ---------- 通用 section ---------- */
.section { padding: 100px 0; }
.section-head { max-width: 720px; margin: 0 auto 60px; text-align: center; }
.section-tag {
  display: inline-block; padding: 6px 14px; font-size: 13px; font-weight: 600;
  color: var(--c-primary); background: rgba(79,140,255,.1); border-radius: 999px;
  margin-bottom: 18px; letter-spacing: .5px;
}
.section-title { font-size: clamp(28px, 3.4vw, 42px); font-weight: 800; line-height: 1.25; letter-spacing: -.5px; }
.section-lead { font-size: 17px; color: var(--c-text-soft); margin-top: 16px; }
.section-lead.center { text-align: center; }
.section-text { font-size: 16px; color: var(--c-text-soft); line-height: 1.85; }

/* ---------- Hero ---------- */
.hero {
  position: relative; min-height: 100vh; padding: calc(var(--nav-h) + 60px) 0 40px;
  background: var(--grad-dark); color: #fff; overflow: hidden;
}
.hero-bg { position: absolute; inset: 0; pointer-events: none; }
.hero-grid {
  position: absolute; inset: 0;
  background-image:
    linear-gradient(rgba(79,140,255,.07) 1px, transparent 1px),
    linear-gradient(90deg, rgba(79,140,255,.07) 1px, transparent 1px);
  background-size: 56px 56px;
  mask-image: radial-gradient(ellipse 80% 60% at 50% 35%, #000 30%, transparent 75%);
}
.orb { position: absolute; border-radius: 50%; filter: blur(80px); opacity: .55; }
.orb-1 { width: 480px; height: 480px; background: #4f8cff; top: -120px; right: -80px; animation: float 12s ease-in-out infinite; }
.orb-2 { width: 380px; height: 380px; background: #00d4ff; bottom: -80px; left: -60px; animation: float 14s ease-in-out infinite reverse; }
.orb-3 { width: 300px; height: 300px; background: #a855f7; top: 40%; left: 45%; opacity: .35; animation: float 16s ease-in-out infinite; }
@keyframes float {
  0%,100% { transform: translate(0,0) scale(1); }
  50% { transform: translate(40px,-30px) scale(1.08); }
}

.hero-inner { position: relative; display: grid; grid-template-columns: 1.05fr .95fr; gap: 60px; align-items: center; }
.badge {
  display: inline-flex; align-items: center; gap: 8px; padding: 7px 16px;
  background: rgba(255,255,255,.08); border: 1px solid rgba(255,255,255,.15);
  border-radius: 999px; font-size: 13px; color: #cdd6e6; margin-bottom: 24px;
  backdrop-filter: blur(8px);
}
.badge .dot { width: 7px; height: 7px; border-radius: 50%; background: var(--c-green); box-shadow: 0 0 0 4px rgba(34,197,94,.2); }
.hero-title { font-size: clamp(40px, 6vw, 68px); font-weight: 900; line-height: 1.1; letter-spacing: -1.5px; }
.grad-text {
  background: linear-gradient(120deg, #4f8cff, #00d4ff 50%, #a855f7);
  -webkit-background-clip: text; background-clip: text; color: transparent;
}
.hero-desc { font-size: 17px; color: #b6c0d6; margin: 26px 0 32px; max-width: 540px; line-height: 1.85; }
.hero-cta { display: flex; gap: 14px; flex-wrap: wrap; }
.hero-stats { display: grid; grid-template-columns: repeat(4, 1fr); gap: 28px; margin-top: 56px; padding-top: 32px; border-top: 1px solid rgba(255,255,255,.1); }
.stat-num { font-size: 32px; font-weight: 800; color: #fff; letter-spacing: -.5px; }
.stat-label { font-size: 13px; color: #8a96b0; margin-top: 4px; }

/* Hero 可视化 */
.hero-visual { position: relative; min-height: 460px; }
.hero-code {
  position: relative; background: rgba(13,18,38,.85); border: 1px solid rgba(255,255,255,.1);
  border-radius: var(--radius-lg); overflow: hidden; box-shadow: var(--shadow-lg);
  backdrop-filter: blur(10px);
}
.code-head { display: flex; align-items: center; gap: 8px; padding: 12px 16px; background: rgba(255,255,255,.04); border-bottom: 1px solid rgba(255,255,255,.08); }
.code-head .dot { width: 11px; height: 11px; border-radius: 50%; }
.code-head .dot.r { background: #ff5f57; } .code-head .dot.y { background: #febc2e; } .code-head .dot.g { background: #28c840; }
.code-file { margin-left: 12px; font-size: 12.5px; color: #8a96b0; font-family: "JetBrains Mono", "Consolas", monospace; }
.code-body { padding: 22px 24px; font-family: "JetBrains Mono", "Consolas", "Courier New", monospace; font-size: 13.5px; line-height: 1.85; color: #c4cde0; overflow-x: auto; }
.c-kw { color: #c792ea; } .c-var { color: #82aaff; } .c-prop { color: #f78c6c; }
.c-str { color: #c3e88d; } .c-num { color: #f78c6c; } .c-fn { color: #82aaff; }

.float-card {
  position: absolute; display: flex; align-items: center; gap: 12px;
  background: rgba(255,255,255,.96); color: var(--c-text);
  padding: 14px 18px; border-radius: var(--radius-md); box-shadow: var(--shadow-lg);
  z-index: 3; animation: floatCard 5s ease-in-out infinite;
}
.fc-icon { width: 38px; height: 38px; border-radius: 10px; display: grid; place-items: center; color: #fff; background: var(--c); }
.fc-title { font-size: 14px; font-weight: 700; }
.fc-sub { font-size: 12px; color: var(--c-text-muted); }
.card-a { top: -28px; left: -32px; animation-delay: 0s; }
.card-b { top: 38%; right: -40px; animation-delay: 1.4s; }
.card-c { bottom: -28px; left: 24px; animation-delay: 2.8s; }
@keyframes floatCard {
  0%,100% { transform: translateY(0); }
  50% { transform: translateY(-10px); }
}

/* 跑马灯 */
.marquee { margin-top: 80px; padding: 18px 0; border-top: 1px solid rgba(255,255,255,.08); border-bottom: 1px solid rgba(255,255,255,.08); overflow: hidden; }
.marquee-track { display: flex; gap: 28px; white-space: nowrap; animation: marquee 28s linear infinite; }
.marquee-track span { font-size: 14px; color: #6b7796; letter-spacing: 1px; }
@keyframes marquee { to { transform: translateX(-50%); } }

/* ---------- 信任带 ---------- */
.trust { padding: 50px 0; background: var(--c-bg-soft); border-bottom: 1px solid var(--c-border); }
.trust-title { text-align: center; font-size: 13px; color: var(--c-text-muted); letter-spacing: 2px; margin-bottom: 28px; text-transform: uppercase; }
.trust-logos { display: flex; flex-wrap: wrap; justify-content: center; gap: 18px 48px; }
.trust-logo {
  font-size: 18px; font-weight: 700; color: var(--c-text-muted); opacity: .7;
  transition: all .3s var(--ease); cursor: default;
}
.trust-logo:hover { opacity: 1; color: var(--c-primary); transform: translateY(-2px); }

/* ---------- 关于我们 ---------- */
.about { background: var(--c-bg); }
.about-grid { display: grid; grid-template-columns: 1fr 1.1fr; gap: 70px; align-items: center; }
.about-visual { position: relative; }
.about-img-wrap { border-radius: var(--radius-lg); overflow: hidden; box-shadow: var(--shadow-lg); aspect-ratio: 4/3; }
.about-img-wrap img { width: 100%; height: 100%; object-fit: cover; transition: transform .8s var(--ease); }
.about-img-wrap:hover img { transform: scale(1.05); }
.about-card {
  position: absolute; background: #fff; padding: 18px 22px; border-radius: var(--radius-md);
  box-shadow: var(--shadow-lg); display: flex; flex-direction: column; gap: 4px;
}
.about-card { bottom: -24px; right: -16px; }
.about-card-2 { top: -24px; left: -16px; }
.about-card-num { font-size: 22px; font-weight: 800; color: var(--c-primary); }
.about-card-text { font-size: 13px; color: var(--c-text-soft); line-height: 1.5; }
.about-content .section-title { margin-bottom: 18px; }
.about-list { margin: 28px 0 32px; display: grid; gap: 14px; }
.about-list li { display: flex; gap: 12px; align-items: flex-start; font-size: 15px; color: var(--c-text-soft); }
.about-list strong { color: var(--c-text); }
.check {
  flex-shrink: 0; width: 22px; height: 22px; border-radius: 50%;
  background: rgba(34,197,94,.12); color: var(--c-green);
  display: grid; place-items: center; font-size: 13px; font-weight: 700;
}

/* ---------- 核心业务 ---------- */
.services { background: var(--c-bg-soft); }
.services-grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: 24px; }
.service-card {
  background: #fff; padding: 36px 30px; border-radius: var(--radius-lg);
  border: 1px solid var(--c-border); transition: all .35s var(--ease);
  position: relative; overflow: hidden;
}
.service-card::before {
  content: ''; position: absolute; top: 0; left: 0; right: 0; height: 3px;
  background: var(--grad-primary); transform: scaleX(0); transform-origin: left; transition: transform .35s var(--ease);
}
.service-card:hover { transform: translateY(-6px); box-shadow: var(--shadow-lg); border-color: transparent; }
.service-card:hover::before { transform: scaleX(1); }
.service-icon {
  width: 56px; height: 56px; border-radius: var(--radius-md); display: grid; place-items: center;
  color: #fff; background: var(--c); margin-bottom: 22px;
  box-shadow: 0 8px 20px color-mix(in srgb, var(--c) 35%, transparent);
}
.service-card h3 { font-size: 20px; font-weight: 700; margin-bottom: 10px; }
.service-card p { font-size: 14.5px; color: var(--c-text-soft); line-height: 1.75; }
.service-tags { display: flex; flex-wrap: wrap; gap: 8px; margin-top: 18px; }
.service-tags li { font-size: 12.5px; padding: 4px 11px; background: var(--c-bg-soft); color: var(--c-text-soft); border-radius: 999px; }

/* ---------- 解决方案 ---------- */
.solutions { background: var(--c-bg); }
.tabs { display: flex; flex-wrap: wrap; justify-content: center; gap: 8px; margin-bottom: 40px; }
.tab {
  padding: 10px 22px; font-size: 15px; font-weight: 500; color: var(--c-text-soft);
  border-radius: 999px; border: 1.5px solid var(--c-border); background: #fff;
  transition: all .25s var(--ease);
}
.tab:hover { color: var(--c-primary); border-color: var(--c-primary); }
.tab.active { color: #fff; background: var(--grad-primary); border-color: transparent; box-shadow: var(--shadow-primary); }
.tab-panels { position: relative; }
.tab-panel { display: none; animation: fadeUp .5s var(--ease); }
.tab-panel.active { display: block; }
@keyframes fadeUp { from { opacity: 0; transform: translateY(16px); } to { opacity: 1; transform: translateY(0); } }
.solution-content {
  display: grid; grid-template-columns: 1.4fr 1fr; gap: 50px; align-items: center;
  background: var(--c-bg-soft); padding: 48px; border-radius: var(--radius-xl); border: 1px solid var(--c-border);
}
.solution-content h3 { font-size: 26px; font-weight: 800; margin-bottom: 14px; }
.solution-list { margin-top: 22px; display: grid; gap: 14px; }
.solution-list li { font-size: 15px; color: var(--c-text-soft); padding-left: 18px; position: relative; }
.solution-list li::before { content: ''; position: absolute; left: 0; top: 11px; width: 6px; height: 6px; border-radius: 50%; background: var(--c-primary); }
.solution-list span { color: var(--c-text); font-weight: 600; margin-right: 6px; }
.solution-visual { display: grid; gap: 16px; }
.metric-box {
  background: #fff; padding: 24px 28px; border-radius: var(--radius-md);
  border: 1px solid var(--c-border); box-shadow: var(--shadow-sm);
  transition: transform .3s var(--ease);
}
.metric-box:hover { transform: translateX(6px); }
.m-num { font-size: 30px; font-weight: 800; background: var(--grad-primary); -webkit-background-clip: text; background-clip: text; color: transparent; }
.m-label { font-size: 13px; color: var(--c-text-muted); margin-top: 4px; }

/* ---------- 核心优势 ---------- */
.advantages { background: var(--grad-dark); color: #fff; position: relative; overflow: hidden; }
.advantages::before {
  content: ''; position: absolute; top: -100px; right: -100px; width: 400px; height: 400px;
  background: radial-gradient(circle, rgba(79,140,255,.2), transparent 70%); filter: blur(40px);
}
.advantages .section-title, .advantages .section-lead { color: #fff; }
.advantages .section-lead { color: #b6c0d6; }
.adv-grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: 24px; position: relative; }
.adv-card {
  padding: 36px 30px; border-radius: var(--radius-lg);
  background: rgba(255,255,255,.04); border: 1px solid rgba(255,255,255,.08);
  transition: all .35s var(--ease); backdrop-filter: blur(10px);
}
.adv-card:hover { background: rgba(255,255,255,.08); transform: translateY(-6px); border-color: rgba(79,140,255,.4); }
.adv-num { font-size: 40px; font-weight: 900; background: var(--grad-primary); -webkit-background-clip: text; background-clip: text; color: transparent; line-height: 1; margin-bottom: 18px; opacity: .9; }
.adv-card h3 { font-size: 19px; font-weight: 700; margin-bottom: 10px; }
.adv-card p { font-size: 14.5px; color: #a8b3cc; line-height: 1.75; }

/* ---------- 流程 ---------- */
.process { background: var(--c-bg); }
.process-steps { display: grid; grid-template-columns: repeat(5, 1fr); gap: 20px; position: relative; }
.process-steps::before {
  content: ''; position: absolute; top: 28px; left: 10%; right: 10%; height: 2px;
  background: linear-gradient(90deg, var(--c-primary), var(--c-cyan)); opacity: .25;
}
.step { text-align: center; position: relative; }
.step-num {
  width: 56px; height: 56px; margin: 0 auto 18px; border-radius: 50%;
  background: #fff; border: 2px solid var(--c-primary); color: var(--c-primary);
  display: grid; place-items: center; font-size: 20px; font-weight: 800;
  position: relative; z-index: 2; transition: all .3s var(--ease);
}
.step:hover .step-num { background: var(--grad-primary); color: #fff; transform: scale(1.08); box-shadow: var(--shadow-primary); }
.step h4 { font-size: 16px; font-weight: 700; margin-bottom: 6px; }
.step p { font-size: 13.5px; color: var(--c-text-soft); }

/* ---------- 案例 ---------- */
.cases { background: var(--c-bg-soft); }
.cases-grid { display: grid; grid-template-columns: repeat(2, 1fr); gap: 28px; }
.case-card {
  background: #fff; border-radius: var(--radius-lg); overflow: hidden;
  border: 1px solid var(--c-border); transition: all .35s var(--ease);
}
.case-card:hover { transform: translateY(-6px); box-shadow: var(--shadow-lg); }
.case-img { position: relative; aspect-ratio: 16/9; overflow: hidden; }
.case-img img { width: 100%; height: 100%; object-fit: cover; transition: transform .6s var(--ease); }
.case-card:hover .case-img img { transform: scale(1.06); }
.case-tag {
  position: absolute; top: 16px; left: 16px; padding: 5px 12px;
  background: rgba(255,255,255,.95); color: var(--c-primary); font-size: 12.5px; font-weight: 600;
  border-radius: 999px; backdrop-filter: blur(8px);
}
.case-body { padding: 26px 28px 30px; }
.case-body h3 { font-size: 19px; font-weight: 700; margin-bottom: 10px; }
.case-body p { font-size: 14.5px; color: var(--c-text-soft); line-height: 1.75; }
.case-meta { display: flex; flex-wrap: wrap; gap: 8px; margin-top: 16px; }
.case-meta span { font-size: 12.5px; padding: 4px 11px; background: var(--c-bg-soft); color: var(--c-text-soft); border-radius: 999px; }

/* ---------- 团队 ---------- */
.team { background: var(--c-bg); }
.team-grid { display: grid; grid-template-columns: repeat(4, 1fr); gap: 24px; }
.team-card {
  padding: 36px 26px; text-align: center; border-radius: var(--radius-lg);
  background: #fff; border: 1px solid var(--c-border); transition: all .35s var(--ease);
}
.team-card:hover { transform: translateY(-6px); box-shadow: var(--shadow-lg); border-color: transparent; }
.team-avatar {
  width: 80px; height: 80px; margin: 0 auto 18px; border-radius: 50%;
  background: var(--c-primary); color: #fff; display: grid; place-items: center;
  font-size: 32px; font-weight: 800; box-shadow: 0 8px 20px rgba(79,140,255,.3);
}
.team-card h3 { font-size: 17px; font-weight: 700; margin-bottom: 4px; }
.team-role { font-size: 13px; color: var(--c-primary); font-weight: 600; margin-bottom: 10px; }
.team-card p { font-size: 13.5px; color: var(--c-text-soft); line-height: 1.7; }

/* ---------- 联系我们 ---------- */
.contact { background: var(--c-bg-soft); }
.contact-grid { display: grid; grid-template-columns: 1fr 1.1fr; gap: 60px; align-items: start; }
.contact-list { margin-top: 32px; display: grid; gap: 20px; }
.contact-list li { display: flex; gap: 14px; align-items: flex-start; }
.ci-icon {
  flex-shrink: 0; width: 44px; height: 44px; border-radius: var(--radius-md);
  background: rgba(79,140,255,.1); color: var(--c-primary);
  display: grid; place-items: center;
}
.ci-label { font-size: 13px; color: var(--c-text-muted); }
.ci-value { font-size: 15px; color: var(--c-text); font-weight: 500; margin-top: 2px; }
.contact-form {
  background: #fff; padding: 36px; border-radius: var(--radius-xl);
  border: 1px solid var(--c-border); box-shadow: var(--shadow-md);
}
.contact-form h3 { font-size: 22px; font-weight: 800; margin-bottom: 24px; }
.form-row { display: grid; grid-template-columns: 1fr 1fr; gap: 16px; }
.form-field { margin-bottom: 18px; }
.form-field label { display: block; font-size: 13.5px; font-weight: 600; color: var(--c-text); margin-bottom: 8px; }
.form-field input, .form-field select, .form-field textarea {
  width: 100%; padding: 12px 14px; border: 1.5px solid var(--c-border); border-radius: var(--radius-sm);
  background: #fff; color: var(--c-text); transition: all .2s var(--ease); font-size: 14.5px;
}
.form-field input:focus, .form-field select:focus, .form-field textarea:focus {
  outline: none; border-color: var(--c-primary); box-shadow: 0 0 0 4px rgba(79,140,255,.12);
}
.form-field textarea { resize: vertical; min-height: 90px; }
.form-tip { margin-top: 14px; font-size: 14px; text-align: center; min-height: 20px; }
.form-tip.success { color: var(--c-green); }
.form-tip.error { color: var(--c-red); }

/* ---------- CTA 带 ---------- */
.cta-band {
  background: var(--grad-primary); padding: 56px 0; color: #fff;
  position: relative; overflow: hidden;
}
.cta-band::before {
  content: ''; position: absolute; inset: 0;
  background-image:
    linear-gradient(rgba(255,255,255,.08) 1px, transparent 1px),
    linear-gradient(90deg, rgba(255,255,255,.08) 1px, transparent 1px);
  background-size: 40px 40px;
}
.cta-inner { position: relative; display: flex; align-items: center; justify-content: space-between; gap: 30px; flex-wrap: wrap; }
.cta-inner h2 { font-size: 28px; font-weight: 800; }
.cta-inner p { font-size: 16px; opacity: .9; margin-top: 6px; }

/* ---------- 页脚 ---------- */
.footer { background: var(--c-bg-dark); color: #b6c0d6; padding: 70px 0 0; }
.footer-grid { display: grid; grid-template-columns: 1.6fr 1fr 1fr 1fr 1.2fr; gap: 40px; padding-bottom: 50px; }
.footer-brand .logo { margin-bottom: 18px; }
.footer-brand .logo-text { color: #fff; }
.footer-desc { font-size: 14px; line-height: 1.8; margin-bottom: 20px; max-width: 320px; }
.social { display: flex; gap: 10px; }
.social a {
  padding: 6px 14px; font-size: 13px; border: 1px solid rgba(255,255,255,.15); border-radius: 999px;
  transition: all .25s var(--ease);
}
.social a:hover { background: var(--c-primary); border-color: var(--c-primary); color: #fff; }
.footer-col h4 { color: #fff; font-size: 15px; font-weight: 700; margin-bottom: 18px; }
.footer-col ul { display: grid; gap: 10px; }
.footer-col li { font-size: 14px; }
.footer-col a { transition: color .2s var(--ease); }
.footer-col a:hover { color: var(--c-cyan); }
.footer-bottom { border-top: 1px solid rgba(255,255,255,.08); padding: 22px 0; }
.fb-inner { display: flex; justify-content: space-between; gap: 16px; flex-wrap: wrap; font-size: 13px; color: #6b7796; }

/* ---------- 返回顶部 ---------- */
.back-top {
  position: fixed; right: 28px; bottom: 28px; width: 48px; height: 48px; border-radius: 50%;
  background: var(--grad-primary); color: #fff; display: grid; place-items: center;
  box-shadow: var(--shadow-primary); opacity: 0; visibility: hidden; transform: translateY(20px);
  transition: all .3s var(--ease); z-index: 90;
}
.back-top.show { opacity: 1; visibility: visible; transform: translateY(0); }
.back-top:hover { transform: translateY(-4px); }

/* ---------- 滚动入场动画 ---------- */
.reveal { opacity: 0; transform: translateY(30px); transition: opacity .7s var(--ease-out), transform .7s var(--ease-out); }
.reveal.visible { opacity: 1; transform: translateY(0); }

/* ---------- 响应式 ---------- */
@media (max-width: 1024px) {
  .hero-inner { grid-template-columns: 1fr; gap: 50px; }
  .hero-visual { min-height: 380px; }
  .about-grid { grid-template-columns: 1fr; gap: 60px; }
  .solution-content { grid-template-columns: 1fr; gap: 30px; padding: 36px; }
  .services-grid, .adv-grid { grid-template-columns: repeat(2, 1fr); }
  .process-steps { grid-template-columns: repeat(3, 1fr); gap: 30px; }
  .process-steps::before { display: none; }
  .team-grid { grid-template-columns: repeat(2, 1fr); }
  .footer-grid { grid-template-columns: 1fr 1fr 1fr; }
  .footer-brand { grid-column: 1 / -1; }
}

@media (max-width: 768px) {
  .section { padding: 70px 0; }
  .nav-menu {
    position: fixed; top: var(--nav-h); left: 0; right: 0;
    background: rgba(255,255,255,.98); backdrop-filter: blur(16px);
    flex-direction: column; align-items: stretch; gap: 0; padding: 12px 24px;
    border-bottom: 1px solid var(--c-border);
    transform: translateY(-130%); transition: transform .35s var(--ease); box-shadow: var(--shadow-md);
  }
  .nav-menu.open { transform: translateY(0); }
  .nav-link { padding: 14px 12px; border-radius: 0; border-bottom: 1px solid var(--c-border); }
  .nav-link.active::after { display: none; }
  .nav-toggle { display: flex; }
  .nav-actions .btn-sm { display: none; }

  .hero { min-height: auto; padding-top: calc(var(--nav-h) + 40px); }
  .hero-stats { grid-template-columns: repeat(2, 1fr); gap: 22px; }
  .stat-num { font-size: 26px; }
  .float-card { display: none; }
  .hero-visual { min-height: auto; }

  .services-grid, .adv-grid, .cases-grid, .team-grid { grid-template-columns: 1fr; }
  .process-steps { grid-template-columns: repeat(2, 1fr); }
  .contact-grid { grid-template-columns: 1fr; gap: 40px; }
  .form-row { grid-template-columns: 1fr; }
  .footer-grid { grid-template-columns: 1fr 1fr; }
  .footer-brand { grid-column: 1 / -1; }
  .cta-inner { flex-direction: column; text-align: center; align-items: center; }
  .about-card { display: none; }
  .container { padding: 0 18px; }
  .section-head { margin-bottom: 40px; }
}

@media (max-width: 480px) {
  .footer-grid { grid-template-columns: 1fr; }
  .hero-title { font-size: 38px; }
  .hero-cta { flex-direction: column; align-items: stretch; }
  .hero-cta .btn { width: 100%; }
  .process-steps { grid-template-columns: 1fr; }
  .back-top { right: 18px; bottom: 18px; }
}

/* ---------- 无障碍 ---------- */
@media (prefers-reduced-motion: reduce) {
  *, *::before, *::after { animation-duration: .01ms !important; animation-iteration-count: 1 !important; transition-duration: .01ms !important; }
  .reveal { opacity: 1; transform: none; }
}