/* ============================================================
   算力资源网 · 通用样式 common.css
   资源型 / 交易枢纽：顶部行情滚动条 + 导航 + 页脚 + 通用组件
   配色：主蓝 #2b7fff / 专网青 #06b6d4 / 涨红 #f5222d / 跌绿 #16a34a
   ============================================================ */

:root {
  --c-primary: #2b7fff;
  --c-primary-deep: #1a63e0;
  --c-primary-light: #eaf3ff;
  --c-primary-grad: linear-gradient(135deg, #2b7fff 0%, #5aa2ff 100%);
  --c-accent: #06b6d4;          /* 算力专网 / 青 */
  --c-accent-grad: linear-gradient(135deg, #06b6d4 0%, #22d3ee 100%);
  --c-up: #f5222d;              /* 涨（红） */
  --c-up-bg: #fff1f0;
  --c-down: #16a34a;            /* 跌（绿） */
  --c-down-bg: #f0fdf4;
  --c-text-main: #16223d;
  --c-text-sub: #5a6b8c;
  --c-text-light: #8ea0bd;
  --c-bg-page: #f4f7fc;
  --c-bg-white: #ffffff;
  --c-border: #e6edf7;
  --c-shadow-card: 0 8px 30px rgba(27, 42, 74, 0.07);
  --c-shadow-hover: 0 16px 44px rgba(27, 42, 74, 0.13);
  --radius-card: 16px;
  --radius-btn: 10px;
  --font-main: "PingFang SC", "Microsoft YaHei", "Helvetica Neue", Arial, sans-serif;
  --nav-height: 72px;
}

/* ---------- 重置 ---------- */
* { margin: 0; padding: 0; box-sizing: border-box; }
body {
  font-family: var(--font-main);
  color: var(--c-text-main);
  background: var(--c-bg-page);
  font-size: 16px;
  line-height: 1.7;
  -webkit-font-smoothing: antialiased;
  padding-top: var(--nav-height);
}
img { max-width: 100%; display: block; }
a { text-decoration: none; color: var(--c-primary); }
ul, ol { list-style: none; }
button, input, textarea, select { font-family: inherit; outline: none; }

.container { width: 1200px; max-width: 92%; margin: 0 auto; }

/* ---------- 通用按钮 ---------- */
.btn {
  display: inline-flex; align-items: center; justify-content: center;
  gap: 8px; padding: 13px 32px; border-radius: var(--radius-btn);
  font-size: 15px; font-weight: 600; cursor: pointer;
  border: 1px solid transparent; transition: all .25s ease;
}
.btn-primary { background: var(--c-primary-grad); color: #fff; box-shadow: 0 6px 18px rgba(43, 127, 255, .35); }
.btn-primary:hover { transform: translateY(-2px); box-shadow: 0 10px 26px rgba(43, 127, 255, .45); }
.btn-accent { background: var(--c-accent-grad); color: #fff; box-shadow: 0 6px 18px rgba(6, 182, 212, .35); }
.btn-accent:hover { transform: translateY(-2px); box-shadow: 0 10px 26px rgba(6, 182, 212, .45); }
.btn-outline { background: var(--c-primary-light); color: var(--c-primary); }
.btn-outline:hover { background: #d9e9ff; transform: translateY(-2px); }
.btn-accent-outline { background: rgba(6,182,212,.1); color: #0891b2; }
.btn-accent-outline:hover { background: rgba(6,182,212,.18); transform: translateY(-2px); }
.btn-ghost { background: rgba(255,255,255,.16); color: #fff; }
.btn-ghost:hover { background: rgba(255,255,255,.26); }
.btn-sm { padding: 8px 20px; font-size: 14px; }
.btn-block { width: 100%; }

/* ---------- 通用板块标题 ---------- */
.sec-head { text-align: center; margin-bottom: 48px; }
.sec-head h2 { font-size: 34px; font-weight: 700; letter-spacing: .5px; }
.sec-head .sec-sub { margin-top: 12px; color: var(--c-text-sub); font-size: 16px; }
.sec-head.on-blue h2, .sec-head.on-blue .sec-sub { color: #fff; }
.sec-head.on-blue .sec-sub { opacity: .85; }
/* 左对齐标题（资源型列表常用） */
.sec-head.left { text-align: left; margin-bottom: 28px; }
.sec-head.left h2 { font-size: 26px; }
.sec-head .head-extra { float: right; margin-top: 8px; }
.sec-head.left::after { content: ""; display: block; clear: both; }

/* ---------- 通用卡片 ---------- */
.card {
  background: var(--c-bg-white); border-radius: var(--radius-card);
  box-shadow: var(--c-shadow-card);
  transition: transform .3s ease, box-shadow .3s ease;
}
.card:hover { transform: translateY(-6px); box-shadow: var(--c-shadow-hover); }

/* 图标方块 */
.icon-box {
  width: 52px; height: 52px; border-radius: 14px;
  background: var(--c-primary-grad);
  display: inline-flex; align-items: center; justify-content: center;
  color: #fff; flex-shrink: 0;
  box-shadow: 0 6px 14px rgba(43, 127, 255, .3);
}
.icon-box svg { width: 26px; height: 26px; }
.icon-box.cyan { background: var(--c-accent-grad); box-shadow: 0 6px 14px rgba(6,182,212,.3); }

/* 标签小胶囊 */
.tag {
  display: inline-block; padding: 4px 12px; border-radius: 999px;
  background: var(--c-primary-light); color: var(--c-primary);
  font-size: 13px; font-weight: 500;
  text-decoration: none; cursor: pointer; transition: background .2s ease, color .2s ease;
}
.tag:hover { background: var(--c-primary); color: #fff; }
.tag.cyan { background: rgba(6,182,212,.12); color: #0891b2; }
.tag.up { background: var(--c-up-bg); color: var(--c-up); }
.tag.down { background: var(--c-down-bg); color: var(--c-down); }

/* 涨跌文字 */
.up { color: var(--c-up); }
.down { color: var(--c-down); }

/* ---------- 顶部导航 ---------- */
.site-header {
  position: fixed; top: 0; left: 0; right: 0; z-index: 100;
  height: var(--nav-height);
  background: rgba(255, 255, 255, .88);
  backdrop-filter: blur(12px); -webkit-backdrop-filter: blur(12px);
  transition: all .3s ease;
}
.site-header.scrolled { box-shadow: 0 4px 20px rgba(27, 42, 74, .08); }
.header-inner { display: flex; align-items: center; justify-content: space-between; height: var(--nav-height); }
.logo { display: flex; align-items: center; gap: 10px; font-size: 20px; font-weight: 700; color: var(--c-text-main); }
.logo-img { height: 40px; width: auto; display: block; }
.logo em { font-style: normal; color: var(--c-primary); }

.main-nav { display: flex; align-items: center; gap: 20px; }
.main-nav a {
  position: relative; font-size: 15px; font-weight: 500; color: var(--c-text-main);
  padding: 6px 0; transition: color .2s;
}
.main-nav a::after {
  content: ""; position: absolute; left: 50%; bottom: -2px;
  width: 0; height: 3px; border-radius: 2px;
  background: var(--c-primary); transition: all .25s ease; transform: translateX(-50%);
}
.main-nav a:hover, .main-nav a.active { color: var(--c-primary); }
.main-nav > a:hover::after, .main-nav > a.active::after { width: 100%; }

/* 下拉 */
.nav-dropdown { position: relative; }
.nav-dropdown > a { cursor: pointer; display: inline-flex; align-items: center; }
.nav-dropdown > a::after {
  position: static; width: 6px; height: 6px; margin-left: 8px; flex-shrink: 0;
  background: none; border-radius: 0;
  border-right: 2px solid currentColor; border-bottom: 2px solid currentColor;
  transform: rotate(45deg); transform-origin: 60% 60%;
  transition: transform .25s ease; opacity: .65;
}
.nav-dropdown.open > a::after { transform: rotate(-135deg); }
.nav-dropdown-menu {
  position: absolute; top: calc(100% + 14px); left: 50%; transform: translate(-50%, 8px);
  width: 260px; background: #fff; border-radius: 14px;
  box-shadow: var(--c-shadow-hover); padding: 10px;
  opacity: 0; visibility: hidden; transition: all .25s ease;
}
.nav-dropdown:hover .nav-dropdown-menu { opacity: 1; visibility: visible; transform: translate(-50%, 0); }
.nav-dropdown-menu a {
  display: flex; align-items: center; gap: 10px; padding: 10px 14px;
  border-radius: 10px; font-size: 14px; color: var(--c-text-main);
}
.nav-dropdown-menu a::after { display: none; }
.nav-dropdown-menu a:hover { background: var(--c-primary-light); color: var(--c-primary); }
.nav-dropdown-menu .dm-ico { width: 30px; height: 30px; border-radius: 8px; background: var(--c-primary-light); color: var(--c-primary); display: inline-flex; align-items: center; justify-content: center; flex-shrink: 0; }
.nav-dropdown-menu .dm-ico svg { width: 16px; height: 16px; }
.nav-dropdown-menu .dm-ico.cyan { background: rgba(6,182,212,.12); color: #0891b2; }
.nav-dropdown-menu .dm-title { font-weight: 600; }
.nav-dropdown-menu .dm-desc { font-size: 12px; color: var(--c-text-light); }

.nav-cta { display: flex; align-items: center; gap: 12px; }
.nav-toggle {
  display: none; width: 42px; height: 42px; border: none; background: transparent;
  cursor: pointer; flex-direction: column; align-items: center; justify-content: center; gap: 5px;
}
.nav-toggle span { width: 22px; height: 2px; border-radius: 2px; background: var(--c-text-main); transition: all .3s; }
.nav-toggle.open span:nth-child(1) { transform: translateY(7px) rotate(45deg); }
.nav-toggle.open span:nth-child(2) { opacity: 0; }
.nav-toggle.open span:nth-child(3) { transform: translateY(-7px) rotate(-45deg); }

/* ---------- 子页页头（面包屑横幅） ---------- */
.page-hero {
  position: relative; padding: 64px 0 56px;
  background:
    radial-gradient(600px 260px at 85% 20%, rgba(43,127,255,.12), transparent 60%),
    radial-gradient(500px 240px at 10% 90%, rgba(6,182,212,.10), transparent 60%),
    linear-gradient(180deg, #eef4fe 0%, var(--c-bg-page) 100%);
  overflow: hidden;
}
.page-hero h1 { font-size: 40px; font-weight: 700; }
.page-hero .page-hero-sub { margin-top: 14px; max-width: 760px; color: var(--c-text-sub); font-size: 17px; }
.breadcrumb { display: flex; align-items: center; gap: 8px; font-size: 13px; color: var(--c-text-light); margin-bottom: 18px; }
.breadcrumb a:hover { color: var(--c-primary); }
.breadcrumb .sep { opacity: .5; }

/* ---------- 页脚 ---------- */
.site-footer { background: #0f1f3d; color: rgba(255,255,255,.72); margin-top: 96px; }
.footer-main { display: grid; grid-template-columns: 1.5fr 1fr 1fr 1.2fr; gap: 48px; padding: 60px 0 40px; }
.footer-brand .logo { color: #fff; margin-bottom: 18px; }
.footer-brand p { font-size: 14px; line-height: 1.9; }
.footer-col h4 { color: #fff; font-size: 16px; margin-bottom: 20px; font-weight: 600; }
.footer-col li { margin-bottom: 12px; font-size: 14px; }
.footer-col a { color: rgba(255,255,255,.72); transition: color .2s; }
.footer-col a:hover { color: var(--c-primary); }
.footer-contact li { display: flex; gap: 10px; align-items: flex-start; }
.footer-contact .icon { color: var(--c-accent); flex-shrink: 0; margin-top: 4px; }
.footer-contact .icon svg { width: 15px; height: 15px; display: block; }
.footer-qr { margin-top: 18px; display: flex; flex-direction: column; align-items: flex-start; gap: 8px; }
.footer-qr img { width: 96px; height: 96px; border-radius: 10px; background: #fff; box-sizing: border-box; object-fit: contain; }
.footer-qr span { color: rgba(255,255,255,.5); font-size: 13px; }
.footer-links { padding: 24px 0 6px; margin-top: 6px; border-top: 1px solid rgba(255,255,255,.08); }
.fl-title { color: rgba(255,255,255,.5); font-size: 13px; letter-spacing: 1px; margin-bottom: 14px; }
.fl-list { display: flex; flex-wrap: wrap; gap: 12px 30px; }
.fl-list a { color: rgba(255,255,255,.5); font-size: 14px; transition: color .2s; }
.fl-list a:hover { color: rgba(255,255,255,.85); }
.footer-bottom { padding: 22px 0; text-align: center; font-size: 13px; color: rgba(255,255,255,.45); }
.footer-bottom a { color: rgba(255,255,255,.55); }
.footer-bottom a:hover { color: #fff; }

/* ---------- 返回顶部 ---------- */
.back-top {
  position: fixed; right: 10px; bottom: 78px; z-index: 90;
  width: 40px; height: 40px; border-radius: 50%; border: none;
  background: var(--c-primary-grad); color: #fff; cursor: pointer;
  display: flex; align-items: center; justify-content: center;
  box-shadow: 0 8px 20px rgba(43, 127, 255, .4);
  opacity: 0; visibility: hidden; transform: translateY(12px);
  transition: all .3s ease;
}
.back-top.show { opacity: 1; visibility: visible; transform: translateY(0); }
.back-top:hover { transform: translateY(-4px); }
.back-top svg { width: 22px; height: 22px; display: block; }

/* ---------- 滚动显现动效 ---------- */
.reveal { opacity: 0; transform: translateY(30px); transition: opacity .7s ease, transform .7s ease; }
.reveal.revealed { opacity: 1; transform: translateY(0); }

/* ---------- 404 页面 ---------- */
.notfound { background: #fff; border-radius: 16px; box-shadow: 0 8px 30px rgba(22, 34, 61, .07); padding: 56px 40px 48px; text-align: center; }
.nf-code { font-size: 96px; line-height: 1; font-weight: 800; letter-spacing: 2px; background: var(--c-primary-grad); -webkit-background-clip: text; background-clip: text; color: transparent; }
.nf-title { margin-top: 18px; font-size: 24px; font-weight: 700; color: var(--c-text-main); }
.nf-desc { margin: 12px auto 0; max-width: 620px; font-size: 15px; line-height: 1.8; color: var(--c-text-sub); }
.nf-actions { margin-top: 28px; display: flex; justify-content: center; gap: 12px; flex-wrap: wrap; }
@media (max-width: 768px) {
  .notfound { padding: 40px 22px 36px; }
  .nf-code { font-size: 68px; }
}

/* ---------- 通用工具 ---------- */
.section { padding: 60px 0; }
.section-tight { padding: 56px 0; }
.bg-white { background: #fff; }
.text-center { text-align: center; }
.mt-40 { margin-top: 40px; }

/* ---------- 响应式 ---------- */
@media (max-width: 1024px) { .footer-main { grid-template-columns: 1fr 1fr; gap: 36px; } }
@media (max-width: 768px) {
  :root { --nav-height: 62px; }
  body { padding-top: var(--nav-height); }
  .sec-head h2 { font-size: 26px; }
  .page-hero h1 { font-size: 28px; }
  .section { padding: 56px 0; }
  .nav-toggle { display: flex; }
  .main-nav {
    position: fixed; top: var(--nav-height); left: 0; right: 0; z-index: 99;
    flex-direction: column; align-items: stretch; gap: 0;
    background: #fff; box-shadow: 0 16px 30px rgba(27,42,74,.1);
    padding: 10px 5%; display: none; max-height: calc(100vh - var(--nav-height)); overflow-y: auto;
  }
  .main-nav.open { display: flex; }
  .main-nav a { padding: 14px 6px; }
  .main-nav a::after { display: none; }
  .main-nav .nav-dropdown { display: flex; flex-direction: column; align-items: stretch; }
  .main-nav .nav-dropdown > a { display: flex; justify-content: space-between; align-items: center; }
  .main-nav .nav-dropdown > a::after { display: inline-block; }
  .main-nav .nav-dropdown-menu,
  .main-nav .nav-dropdown:hover .nav-dropdown-menu {
    position: static; transform: none; opacity: 1; visibility: visible;
    box-shadow: none; border: none; width: 100%; padding: 0 0 0 16px; display: none;
  }
  .main-nav .nav-dropdown.open .nav-dropdown-menu,
  .main-nav .nav-dropdown.open:hover .nav-dropdown-menu { display: block; }
  .nav-cta .btn { display: none; }
  .footer-main { grid-template-columns: 1fr; gap: 32px; padding: 48px 0 32px; }
  .sec-head .head-extra { float: none; display: block; margin-top: 14px; text-align: left; }
}