/* =========================================================
   华版数字版权综合服务平台 · 主站样式
   色调：天蓝色（Sky Blue）
   ========================================================= */

:root {
  --sky-50:  #f0f9ff;
  --sky-100: #e0f2fe;
  --sky-200: #bae6fd;
  --sky-300: #7dd3fc;
  --sky-400: #38bdf8;
  --sky-500: #0ea5e9;
  --sky-600: #0284c7;
  --sky-700: #0369a1;
  --sky-800: #075985;
  --sky-900: #0c4a6e;

  --ink:   #0d1b2a;
  --text:  #334e68;
  --muted: #627d98;
  --line:  #e2eef7;
  --white: #ffffff;

  --radius:    18px;
  --radius-sm: 12px;
  --shadow-sm: 0 4px 14px rgba(14, 165, 233, .08);
  --shadow-md: 0 14px 34px rgba(14, 165, 233, .14);
  --shadow-lg: 0 26px 60px rgba(8, 84, 130, .18);
  --container: 1180px;
}

* { box-sizing: border-box; }

html { scroll-behavior: smooth; }

body {
  margin: 0;
  font-family: -apple-system, BlinkMacSystemFont, "PingFang SC", "Hiragino Sans GB",
    "Microsoft YaHei", "Source Han Sans SC", "Noto Sans SC", "Helvetica Neue", Arial, sans-serif;
  color: var(--text);
  background: var(--white);
  line-height: 1.75;
  -webkit-font-smoothing: antialiased;
  text-rendering: optimizeLegibility;
}

h1, h2, h3 { color: var(--ink); line-height: 1.3; margin: 0 0 .6em; font-weight: 800; letter-spacing: .2px; }
p { margin: 0 0 1em; }
a { color: var(--sky-600); text-decoration: none; transition: color .2s ease; }
a:hover { color: var(--sky-500); }
img { max-width: 100%; display: block; }
ul { margin: 0; padding: 0; list-style: none; }

.container { width: 100%; max-width: var(--container); margin: 0 auto; padding: 0 24px; }
.mt { margin-top: 44px; }

/* ---------- 顶部导航 ---------- */
.nav {
  position: sticky;
  top: 0;
  z-index: 100;
  background: rgba(255, 255, 255, .82);
  backdrop-filter: saturate(180%) blur(14px);
  -webkit-backdrop-filter: saturate(180%) blur(14px);
  border-bottom: 1px solid transparent;
  transition: box-shadow .3s ease, border-color .3s ease, background .3s ease;
}
.nav.is-scrolled { box-shadow: 0 6px 24px rgba(12, 74, 110, .07); border-bottom-color: var(--line); }
.nav__inner { display: flex; align-items: center; justify-content: space-between; height: 74px; gap: 20px; }

.brand { display: flex; align-items: center; gap: 12px; color: var(--ink); }
.brand__mark { display: grid; place-items: center; filter: drop-shadow(0 6px 14px rgba(14,165,233,.35)); }
.brand__text { display: flex; flex-direction: column; line-height: 1.15; }
.brand__text strong { font-size: 18px; font-weight: 800; letter-spacing: .5px; }
.brand__text em { font-style: normal; font-size: 10px; letter-spacing: 1.6px; color: var(--sky-500); font-weight: 600; }

.nav__menu { display: flex; align-items: center; gap: 30px; }
.nav__menu a { color: var(--text); font-size: 15px; font-weight: 600; position: relative; }
.nav__menu a::after {
  content: ""; position: absolute; left: 0; bottom: -7px; height: 2px; width: 0;
  background: linear-gradient(90deg, var(--sky-400), var(--sky-600)); border-radius: 2px; transition: width .28s ease;
}
.nav__menu a:hover { color: var(--sky-700); }
.nav__menu a:hover::after { width: 100%; }
.nav__cta {
  padding: 9px 20px; border-radius: 999px; color: #fff !important;
  background: linear-gradient(135deg, var(--sky-400), var(--sky-600));
  box-shadow: 0 10px 22px rgba(14,165,233,.32);
}
.nav__cta::after { display: none; }
.nav__cta:hover { filter: brightness(1.05); }

.nav__toggle { display: none; flex-direction: column; gap: 5px; background: none; border: 0; cursor: pointer; padding: 8px; }
.nav__toggle span { width: 24px; height: 2px; background: var(--sky-700); border-radius: 2px; transition: .3s; }

/* ---------- 首屏 ---------- */
.hero { position: relative; overflow: hidden; padding: 108px 0 92px; }
.hero__bg {
  position: absolute; inset: 0;
  background:
    radial-gradient(1200px 520px at 78% -8%, var(--sky-100), transparent 60%),
    linear-gradient(180deg, var(--sky-50) 0%, #ffffff 78%);
}
.hero__glow {
  position: absolute; right: -140px; top: -60px; width: 620px; height: 620px; border-radius: 50%;
  background: radial-gradient(circle at 30% 30%, rgba(56,189,248,.42), rgba(2,132,199,.10) 55%, transparent 72%);
  filter: blur(6px); animation: float 9s ease-in-out infinite;
}
@keyframes float { 0%,100% { transform: translateY(0) } 50% { transform: translateY(22px) } }

.hero__inner { position: relative; max-width: 860px; }
.hero__eyebrow {
  display: inline-flex; align-items: center; gap: 9px; font-size: 14px; font-weight: 600; color: var(--sky-700);
  background: rgba(224,242,254,.9); border: 1px solid var(--sky-200); padding: 7px 16px; border-radius: 999px; margin-bottom: 22px;
}
.hero__eyebrow .dot { width: 8px; height: 8px; border-radius: 50%; background: var(--sky-500); box-shadow: 0 0 0 4px rgba(56,189,248,.25); }

.hero__title { font-size: clamp(34px, 5.2vw, 60px); letter-spacing: 1px; margin-bottom: 20px; }
.hero__title span {
  background: linear-gradient(120deg, var(--sky-500) 10%, var(--sky-700) 60%, var(--sky-900) 100%);
  -webkit-background-clip: text; background-clip: text; color: transparent;
}
.hero__sub { font-size: clamp(15px, 1.6vw, 18px); color: var(--muted); max-width: 720px; margin-bottom: 32px; }
.hero__actions { display: flex; flex-wrap: wrap; gap: 14px; margin-bottom: 34px; }

.btn {
  display: inline-flex; align-items: center; justify-content: center; gap: 8px;
  padding: 13px 28px; border-radius: 999px; font-size: 15px; font-weight: 700; cursor: pointer;
  transition: transform .2s ease, box-shadow .25s ease, background .25s ease; border: 1px solid transparent;
}
.btn--primary { color: #fff; background: linear-gradient(135deg, var(--sky-400), var(--sky-600)); box-shadow: 0 14px 30px rgba(14,165,233,.34); }
.btn--primary:hover { transform: translateY(-2px); box-shadow: 0 20px 40px rgba(14,165,233,.42); color: #fff; }
.btn--ghost { color: var(--sky-700); background: #fff; border-color: var(--sky-200); }
.btn--ghost:hover { transform: translateY(-2px); border-color: var(--sky-400); box-shadow: var(--shadow-sm); }

.hero__badges { display: flex; flex-wrap: wrap; gap: 10px 22px; color: var(--muted); font-size: 14px; }
.hero__badges li { position: relative; padding-left: 22px; }
.hero__badges li::before {
  content: ""; position: absolute; left: 0; top: 50%; transform: translateY(-50%);
  width: 14px; height: 14px; border-radius: 50%;
  background: var(--sky-100) url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' viewBox='0 0 24 24'%3E%3Cpath d='M9 16.2l-3.5-3.5-1.4 1.4L9 19 20 8l-1.4-1.4z' fill='%230284c7'/%3E%3C/svg%3E") center/10px no-repeat;
}

/* ---------- 数据条 ---------- */
.stats { padding: 26px 0; }
.stats__grid {
  display: grid; grid-template-columns: repeat(4, 1fr); gap: 14px;
  background: linear-gradient(135deg, var(--sky-600), var(--sky-800));
  border-radius: var(--radius); padding: 34px 26px; box-shadow: var(--shadow-md); color: #fff;
  position: relative; overflow: hidden;
}
.stats__grid::after {
  content: ""; position: absolute; right: -60px; top: -60px; width: 260px; height: 260px; border-radius: 50%;
  background: radial-gradient(circle at 40% 40%, rgba(125,211,252,.4), transparent 68%);
}
.stat { text-align: center; position: relative; }
.stat b { display: block; font-size: clamp(26px, 3.2vw, 38px); font-weight: 800; letter-spacing: .5px; }
.stat span { font-size: 14px; color: rgba(255,255,255,.82); }

/* ---------- 通用区块 ---------- */
.section { padding: 92px 0; }
.section--tint { background: linear-gradient(180deg, var(--sky-50), #ffffff); }
.section__head { max-width: 780px; }
.section__head h2 { font-size: clamp(26px, 3.4vw, 40px); margin-top: 12px; }
.tag {
  display: inline-block; font-size: 13px; font-weight: 700; letter-spacing: 2px; color: var(--sky-700);
  background: var(--sky-100); border-radius: 999px; padding: 6px 16px;
}
.lead { font-size: 16.5px; color: var(--muted); }

.grid { display: grid; gap: 22px; }
.grid--3 { grid-template-columns: repeat(3, 1fr); }
.grid--4 { grid-template-columns: repeat(4, 1fr); }

.card {
  background: #fff; border: 1px solid var(--line); border-radius: var(--radius); padding: 30px 26px;
  box-shadow: var(--shadow-sm); transition: transform .28s ease, box-shadow .28s ease, border-color .28s ease;
}
.card:hover { transform: translateY(-6px); box-shadow: var(--shadow-md); border-color: var(--sky-200); }
.card h3 { font-size: 19px; margin-bottom: .5em; }
.card h3::before { content: ""; display: block; width: 34px; height: 4px; border-radius: 4px; margin-bottom: 14px; background: linear-gradient(90deg, var(--sky-400), var(--sky-600)); }
.card p { color: var(--muted); margin: 0; font-size: 15px; }

.about__note {
  margin-top: 30px; padding: 22px 26px; border-radius: var(--radius);
  background: linear-gradient(135deg, var(--sky-50), #fff); border-left: 4px solid var(--sky-500);
  color: var(--text); font-size: 15.5px;
}

/* ---------- 服务卡片 ---------- */
.service {
  background: #fff; border: 1px solid var(--line); border-radius: var(--radius); padding: 30px 26px;
  box-shadow: var(--shadow-sm); position: relative; overflow: hidden;
  transition: transform .28s ease, box-shadow .28s ease, border-color .28s ease;
}
.service::before {
  content: ""; position: absolute; inset: 0 0 auto 0; height: 3px; transform: scaleX(0); transform-origin: left;
  background: linear-gradient(90deg, var(--sky-400), var(--sky-600)); transition: transform .35s ease;
}
.service:hover { transform: translateY(-6px); box-shadow: var(--shadow-lg); border-color: var(--sky-200); }
.service:hover::before { transform: scaleX(1); }
.service__icon {
  width: 56px; height: 56px; border-radius: 14px; display: grid; place-items: center; margin-bottom: 18px;
  color: var(--sky-600); background: linear-gradient(135deg, var(--sky-100), #fff); border: 1px solid var(--sky-200);
}
.service__icon svg { width: 28px; height: 28px; }
.service h3 { font-size: 18px; margin-bottom: .55em; }
.service p { color: var(--muted); font-size: 14.6px; margin: 0; }

/* ---------- 左右分栏 ---------- */
.split { display: grid; grid-template-columns: 1.05fr .95fr; gap: 56px; align-items: center; }
.split__text h2 { font-size: clamp(24px, 3vw, 36px); margin-top: 12px; }
.split__text > p { color: var(--muted); font-size: 16px; }
.checklist { margin: 20px 0 28px; display: grid; gap: 12px; }
.checklist li { position: relative; padding-left: 32px; color: var(--text); font-weight: 500; }
.checklist li::before {
  content: ""; position: absolute; left: 0; top: 2px; width: 20px; height: 20px; border-radius: 50%;
  background: linear-gradient(135deg, var(--sky-400), var(--sky-600)) center/20px no-repeat,
    url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' viewBox='0 0 24 24'%3E%3Cpath d='M9 16.2l-3.5-3.5-1.4 1.4L9 19 20 8l-1.4-1.4z' fill='%23fff'/%3E%3C/svg%3E") center/13px no-repeat;
}
.split__media { border-radius: 22px; overflow: hidden; box-shadow: var(--shadow-lg); border: 6px solid #fff; }
.split__media img { width: 100%; height: 100%; object-fit: cover; aspect-ratio: 4 / 3.4; }

/* ---------- 核心价值 ---------- */
.value {
  background: #fff; border: 1px solid var(--line); border-radius: var(--radius); padding: 28px 24px;
  box-shadow: var(--shadow-sm); transition: transform .28s ease, box-shadow .28s ease;
}
.value:hover { transform: translateY(-6px); box-shadow: var(--shadow-md); }
.value__no {
  display: inline-block; font-size: 15px; font-weight: 800; letter-spacing: 1px; color: var(--sky-600);
  background: var(--sky-50); border: 1px solid var(--sky-200); border-radius: 8px; padding: 4px 10px; margin-bottom: 14px;
}
.value h3 { font-size: 18px; margin-bottom: .5em; }
.value p { color: var(--muted); font-size: 14.4px; margin: 0; }

/* ---------- 平台文化 ---------- */
.culture { display: grid; grid-template-columns: repeat(2, 1fr); gap: 22px; margin-top: 40px; }
.culture__item {
  background: linear-gradient(135deg, #fff, var(--sky-50)); border: 1px solid var(--sky-100);
  border-radius: var(--radius); padding: 30px 28px; position: relative; overflow: hidden;
  box-shadow: var(--shadow-sm); transition: transform .28s ease, box-shadow .28s ease;
}
.culture__item:hover { transform: translateY(-5px); box-shadow: var(--shadow-md); }
.culture__item h3 { color: var(--sky-700); font-size: 18px; }
.culture__item h3::after { content: ""; display: block; width: 40px; height: 3px; border-radius: 3px; margin-top: 10px; background: linear-gradient(90deg, var(--sky-400), var(--sky-600)); }
.culture__item p { color: var(--text); margin: 14px 0 0; font-size: 15.4px; }

/* ---------- 联系 ---------- */
.contact {
  background: #fff; border: 1px solid var(--line); border-radius: var(--radius); padding: 28px 26px; box-shadow: var(--shadow-sm);
}
.contact h3 { font-size: 18px; color: var(--sky-700); }
.contact p { margin: .3em 0; color: var(--muted); font-size: 15px; }
.contact b { color: var(--ink); }

/* ---------- 页脚 ---------- */
.footer {
  background: linear-gradient(180deg, var(--sky-900), #062a3d);
  color: rgba(255,255,255,.78); padding: 60px 0 34px; margin-top: 0;
}
.footer__inner { display: grid; gap: 26px; grid-template-columns: 1.2fr 1fr; align-items: start; }
.footer__brand strong { color: #fff; font-size: 19px; display: block; margin-bottom: 8px; }
.footer__brand p { color: rgba(255,255,255,.66); font-size: 14px; margin: 0; }
.footer__links { display: flex; flex-wrap: wrap; gap: 10px 26px; justify-content: flex-end; }
.footer__links a { color: rgba(255,255,255,.8); font-size: 14.5px; }
.footer__links a:hover { color: #fff; }
.footer__legal { grid-column: 1 / -1; border-top: 1px solid rgba(255,255,255,.14); padding-top: 22px; }
.footer__legal p { margin: .35em 0; font-size: 13.4px; }
.footer__copy { color: rgba(255,255,255,.72); }
.footer__icp { display: flex; flex-wrap: wrap; align-items: center; gap: 10px; }
.footer__icp a { color: rgba(255,255,255,.82); display: inline-flex; align-items: center; gap: 6px; }
.footer__icp a:hover { color: #fff; }
.footer__icp .sep { color: rgba(255,255,255,.32); }
.ghs { width: 15px; height: 15px; }
.footer__note { color: rgba(255,255,255,.5); font-size: 12.6px; }

/* ---------- 滚动显现动画 ---------- */
.reveal { opacity: 0; transform: translateY(22px); transition: opacity .7s ease, transform .7s ease; }
.reveal.is-visible { opacity: 1; transform: none; }

@media (prefers-reduced-motion: reduce) {
  .reveal { opacity: 1; transform: none; transition: none; }
  .hero__glow { animation: none; }
  html { scroll-behavior: auto; }
}

/* ---------- 响应式 ---------- */
@media (max-width: 980px) {
  .grid--4 { grid-template-columns: repeat(2, 1fr); }
  .grid--3 { grid-template-columns: repeat(2, 1fr); }
  .split { grid-template-columns: 1fr; gap: 34px; }
  .split__media { order: -1; }
  .footer__inner { grid-template-columns: 1fr; }
  .footer__links { justify-content: flex-start; }
}

@media (max-width: 760px) {
  .nav__toggle { display: flex; }
  .nav__menu {
    position: fixed; inset: 74px 0 auto 0; flex-direction: column; align-items: stretch; gap: 0;
    background: #fff; box-shadow: var(--shadow-lg); padding: 8px 24px 22px;
    transform: translateY(-12px); opacity: 0; visibility: hidden; transition: .28s ease;
  }
  .nav__menu.is-open { transform: none; opacity: 1; visibility: visible; }
  .nav__menu a { padding: 15px 0; border-bottom: 1px solid var(--line); }
  .nav__menu a::after { display: none; }
  .nav__cta { margin-top: 14px; text-align: center; }

  .hero { padding: 78px 0 64px; }
  .section { padding: 66px 0; }
  .grid--3, .grid--4 { grid-template-columns: 1fr; }
  .culture { grid-template-columns: 1fr; }
  .stats__grid { grid-template-columns: repeat(2, 1fr); padding: 26px 18px; gap: 20px; }
}