/* ============================================================
   九士弘官网 - 设计系统
   品牌色取自LOGO：藏蓝 #15549C / 金黄 #F8B500
   ============================================================ */

:root {
  --blue: #15549c;
  --blue-deep: #0d3a6e;
  --blue-darker: #092a52;
  --blue-light: #e8f0fa;
  --gold: #f8b500;
  --gold-dark: #d99e00;
  --gold-light: #fff7e0;
  --ink: #1c2533;
  --ink-2: #4a5568;
  --ink-3: #8492a6;
  --line: #e4e9f0;
  --bg: #f5f7fa;
  --card: #ffffff;
  --green: #2f9e63;
  --red: #d9534f;
  --radius: 12px;
  --radius-sm: 8px;
  --shadow: 0 2px 8px rgba(13, 58, 110, 0.08);
  --shadow-lg: 0 8px 30px rgba(13, 58, 110, 0.14);
  --font: -apple-system, "PingFang SC", "Microsoft YaHei", "Segoe UI", sans-serif;
  --mono: "Cascadia Code", Consolas, "Courier New", monospace;
}

* { margin: 0; padding: 0; box-sizing: border-box; }
html { scroll-behavior: smooth; }
body { font-family: var(--font); color: var(--ink); background: var(--bg); line-height: 1.7; font-size: 15px; }
a { color: var(--blue); text-decoration: none; }
a:hover { color: var(--gold-dark); }
img { max-width: 100%; display: block; }
button { font-family: var(--font); cursor: pointer; }

.container { max-width: 1200px; margin: 0 auto; padding: 0 20px; }

/* ---------- 顶部导航 ---------- */
.site-header {
  position: sticky; top: 0; z-index: 100;
  background: rgba(255, 255, 255, 0.96);
  backdrop-filter: blur(8px);
  border-bottom: 1px solid var(--line);
}
.nav-bar { display: flex; align-items: center; gap: 16px; height: 64px; flex-wrap: nowrap; }
.nav-logo { display: flex; align-items: center; gap: 10px; flex-shrink: 0; }
.nav-logo img { height: 40px; width: auto; }
.nav-logo .logo-text { font-weight: 700; font-size: 17px; color: var(--blue-deep); line-height: 1.2; }
.nav-logo .logo-text small { display: block; font-size: 10px; color: var(--ink-3); font-weight: 400; letter-spacing: 1px; }
.nav-links { display: flex; gap: 2px; flex: 1; flex-wrap: nowrap; }
.nav-links a {
  padding: 6px 9px; border-radius: 6px; color: var(--ink-2);
  font-size: 14px; white-space: nowrap;
}
.nav-links a:hover { background: var(--blue-light); color: var(--blue); }
.nav-links a.active { background: var(--blue); color: #fff; font-weight: 600; }
.nav-cta {
  background: var(--gold); color: var(--blue-darker); font-weight: 700;
  padding: 9px 20px; border-radius: 8px; border: none; font-size: 15px;
  flex-shrink: 0; transition: transform .15s, box-shadow .15s;
}
.nav-cta:hover { transform: translateY(-1px); box-shadow: 0 4px 12px rgba(248, 181, 0, .4); color: var(--blue-darker); }
.nav-toggle { display: none; background: none; border: none; font-size: 26px; color: var(--blue-deep); }
.nav-user {
  flex-shrink: 0; font-size: 14px; color: var(--blue-deep); font-weight: 600;
  padding: 7px 14px; border-radius: 20px; background: var(--blue-light);
  white-space: nowrap; max-width: 130px; overflow: hidden; text-overflow: ellipsis;
}
.nav-user:hover { background: var(--gold-light); color: var(--gold-dark); }

/* 下拉导航 */
.nav-drop { position: relative; }
.nav-drop > a { display: block; padding: 6px 9px; border-radius: 6px; color: var(--ink-2); font-size: 14px; white-space: nowrap; }
.nav-drop > a:hover { background: var(--blue-light); color: var(--blue); }
.nav-drop > a.active { background: var(--blue); color: #fff; font-weight: 600; }
.drop-panel {
  display: none; position: absolute; top: 100%; left: 0; min-width: 170px;
  background: #fff; border: 1px solid var(--line); border-radius: 10px;
  box-shadow: var(--shadow-lg); padding: 8px; z-index: 200;
}
.nav-drop:hover .drop-panel { display: block; }
.drop-panel a { display: block; padding: 9px 14px; border-radius: 7px; font-size: 14px; color: var(--ink-2); }
.drop-panel a:hover { background: var(--blue-light); color: var(--blue); }
.drop-panel a.drop-active { background: var(--blue); color: #fff; font-weight: 600; }

/* ---------- 页面标题区 ---------- */
.page-hero {
  background: linear-gradient(135deg, var(--blue-darker) 0%, var(--blue) 70%, #1d6cc4 100%);
  color: #fff; padding: 52px 0 44px; position: relative; overflow: hidden;
}
.page-hero::after {
  content: ""; position: absolute; right: -120px; top: -120px; width: 380px; height: 380px;
  border-radius: 50%; border: 50px solid rgba(248, 181, 0, .14);
}
.page-hero h1 { font-size: 32px; margin-bottom: 10px; position: relative; z-index: 1; }
.page-hero p { color: rgba(255,255,255,.85); max-width: 720px; position: relative; z-index: 1; font-size: 16px; }
.page-hero .crumb { font-size: 13px; color: rgba(255,255,255,.6); margin-bottom: 14px; position: relative; z-index: 1; }
.page-hero .crumb a { color: rgba(255,255,255,.75); }

/* ---------- 通用区块 ---------- */
.section { padding: 56px 0; }
.section-head { text-align: center; margin-bottom: 38px; }
.section-head h2 { font-size: 28px; color: var(--blue-deep); margin-bottom: 8px; }
.section-head h2 .accent { color: var(--gold-dark); }
.section-head p { color: var(--ink-3); font-size: 15px; }
.section-alt { background: #fff; }

/* ---------- 卡片 ---------- */
.card {
  background: var(--card); border-radius: var(--radius); box-shadow: var(--shadow);
  border: 1px solid var(--line); overflow: hidden;
  transition: transform .18s, box-shadow .18s;
}
.card:hover { transform: translateY(-3px); box-shadow: var(--shadow-lg); }
.card-body { padding: 20px; }
.grid { display: grid; gap: 22px; }
.grid-2 { grid-template-columns: repeat(2, 1fr); }
.grid-3 { grid-template-columns: repeat(3, 1fr); }
.grid-4 { grid-template-columns: repeat(4, 1fr); }

/* ---------- 徽章 ---------- */
.badge {
  display: inline-block; padding: 2px 10px; border-radius: 20px;
  font-size: 12px; font-weight: 600; line-height: 1.8; white-space: nowrap;
}
.badge-blue { background: var(--blue-light); color: var(--blue); }
.badge-gold { background: var(--gold-light); color: var(--gold-dark); }
.badge-green { background: #e3f5eb; color: var(--green); }
.badge-gray { background: #eef1f5; color: var(--ink-3); }
.badge-red { background: #fdeceb; color: var(--red); }

/* ---------- 按钮 ---------- */
.btn {
  display: inline-block; padding: 11px 26px; border-radius: 8px; border: none;
  font-size: 15px; font-weight: 600; text-align: center; transition: all .15s;
}
.btn-primary { background: var(--blue); color: #fff; }
.btn-primary:hover { background: var(--blue-deep); color: #fff; transform: translateY(-1px); }
.btn-gold { background: var(--gold); color: var(--blue-darker); }
.btn-gold:hover { background: var(--gold-dark); color: var(--blue-darker); transform: translateY(-1px); }
.btn-outline { background: transparent; color: var(--blue); border: 1.5px solid var(--blue); }
.btn-outline:hover { background: var(--blue-light); }
.btn-outline-light { background: transparent; color: #fff; border: 1.5px solid rgba(255,255,255,.6); }
.btn-outline-light:hover { background: rgba(255,255,255,.12); color: #fff; }
.btn-sm { padding: 7px 16px; font-size: 13px; }
.btn-block { display: block; width: 100%; }

/* ---------- 表格 ---------- */
.table-wrap { overflow-x: auto; border-radius: var(--radius-sm); border: 1px solid var(--line); }
table.data { width: 100%; border-collapse: collapse; background: #fff; font-size: 14px; }
table.data th {
  background: var(--blue-deep); color: #fff; padding: 11px 14px; text-align: left;
  font-weight: 600; white-space: nowrap;
}
table.data td { padding: 10px 14px; border-bottom: 1px solid var(--line); }
table.data tr:nth-child(even) td { background: #f9fbfd; }
table.data tr:hover td { background: var(--blue-light); }
table.data td.hl { color: var(--blue); font-weight: 700; }
table.data .diff { background: var(--gold-light) !important; font-weight: 600; }

/* ---------- 表单 ---------- */
.form-group { margin-bottom: 18px; }
.form-group label { display: block; font-weight: 600; margin-bottom: 6px; font-size: 14px; color: var(--ink); }
.form-group label .req { color: var(--red); }
.form-control {
  width: 100%; padding: 10px 14px; border: 1.5px solid var(--line); border-radius: 8px;
  font-size: 15px; font-family: var(--font); background: #fff; color: var(--ink);
  transition: border-color .15s;
}
.form-control:focus { outline: none; border-color: var(--blue); box-shadow: 0 0 0 3px rgba(21,84,156,.1); }
textarea.form-control { resize: vertical; min-height: 100px; }

/* ---------- 文章排版 ---------- */
.article-content { font-size: 16px; line-height: 1.9; color: #2a3344; }
.article-content h2 {
  font-size: 22px; color: var(--blue-deep); margin: 36px 0 14px;
  padding-left: 12px; border-left: 4px solid var(--gold);
}
.article-content h3 { font-size: 18px; color: var(--ink); margin: 26px 0 10px; }
.article-content p { margin-bottom: 14px; }
.article-content ul, .article-content ol { margin: 0 0 14px 24px; }
.article-content li { margin-bottom: 6px; }
.article-content table { width: 100%; border-collapse: collapse; margin: 16px 0; font-size: 14px; }
.article-content table th { background: var(--blue-deep); color: #fff; padding: 9px 12px; text-align: left; }
.article-content table td { padding: 8px 12px; border: 1px solid var(--line); }
.article-content blockquote {
  border-left: 4px solid var(--blue); background: var(--blue-light);
  padding: 14px 18px; border-radius: 0 8px 8px 0; margin: 16px 0; color: var(--blue-deep);
}
.article-content code { font-family: var(--mono); background: #eef1f5; padding: 2px 6px; border-radius: 4px; font-size: 14px; }
.article-content .tip {
  background: var(--gold-light); border: 1px solid #f0d890; border-radius: 8px;
  padding: 14px 18px; margin: 16px 0;
}
.article-content .tip strong:first-child { color: var(--gold-dark); }

/* ---------- 页脚 ---------- */
.site-footer { background: var(--blue-darker); color: rgba(255,255,255,.75); margin-top: 60px; }
.footer-main { display: grid; grid-template-columns: 1.4fr 1fr 1fr 1.2fr; gap: 36px; padding: 48px 0 36px; }
.footer-main h4 { color: #fff; font-size: 15px; margin-bottom: 16px; }
.footer-main a { display: block; color: rgba(255,255,255,.65); margin-bottom: 9px; font-size: 14px; }
.footer-main a:hover { color: var(--gold); }
.footer-brand img { height: 44px; margin-bottom: 14px; background: #fff; border-radius: 8px; padding: 4px; }
.footer-brand p { font-size: 13px; line-height: 1.8; }
.footer-bottom {
  border-top: 1px solid rgba(255,255,255,.12); padding: 18px 0;
  font-size: 13px; color: rgba(255,255,255,.45); text-align: center;
}
.footer-contact li { list-style: none; margin-bottom: 9px; font-size: 14px; }
.footer-contact .gold { color: var(--gold); font-weight: 700; font-size: 17px; }

/* ---------- 首页英雄区 ---------- */
.home-hero {
  background: linear-gradient(120deg, var(--blue-darker) 0%, var(--blue-deep) 45%, var(--blue) 100%);
  color: #fff; padding: 72px 0 64px; position: relative; overflow: hidden;
}
.home-hero::before {
  content: ""; position: absolute; left: -160px; bottom: -200px; width: 460px; height: 460px;
  border-radius: 50%; border: 60px solid rgba(248,181,0,.1);
}
.home-hero::after {
  content: ""; position: absolute; right: -100px; top: -140px; width: 400px; height: 400px;
  border-radius: 50%; border: 50px solid rgba(255,255,255,.05);
}
.hero-inner { display: grid; grid-template-columns: 1.15fr 1fr; gap: 48px; align-items: center; position: relative; z-index: 1; }
.hero-tag {
  display: inline-block; background: rgba(248,181,0,.15); border: 1px solid rgba(248,181,0,.5);
  color: var(--gold); padding: 5px 16px; border-radius: 20px; font-size: 13px; font-weight: 600;
  margin-bottom: 18px; letter-spacing: 1px;
}
.hero-inner h1 { font-size: 40px; line-height: 1.35; margin-bottom: 16px; }
.hero-inner h1 .gold { color: var(--gold); }
.hero-sub { font-size: 17px; color: rgba(255,255,255,.82); margin-bottom: 28px; max-width: 540px; }
.hero-actions { display: flex; gap: 14px; flex-wrap: wrap; margin-bottom: 36px; }
.hero-img { border-radius: 16px; box-shadow: 0 20px 60px rgba(0,0,0,.35); overflow: hidden; }
.hero-search { max-width: 540px; margin-bottom: 30px; display: flex; }
.hero-search input {
  flex: 1; padding: 13px 18px; border: none; border-radius: 10px 0 0 10px; font-size: 15px;
  font-family: var(--font); outline: none;
}
.hero-search button {
  background: var(--gold); border: none; color: var(--blue-darker); font-weight: 700;
  padding: 0 26px; border-radius: 0 10px 10px 0; font-size: 15px;
}
.hero-stats { display: flex; gap: 38px; flex-wrap: wrap; }
.hero-stats .stat b { display: block; font-size: 28px; color: var(--gold); font-family: var(--mono); }
.hero-stats .stat span { font-size: 13px; color: rgba(255,255,255,.65); }

/* ---------- 首页模块导航 ---------- */
.module-card { text-align: left; padding: 26px 22px; position: relative; }
.module-card .mod-icon {
  width: 52px; height: 52px; border-radius: 12px; display: flex; align-items: center;
  justify-content: center; font-size: 26px; margin-bottom: 14px;
  background: var(--blue-light);
}
.module-card h3 { font-size: 17px; color: var(--blue-deep); margin-bottom: 6px; }
.module-card p { font-size: 13.5px; color: var(--ink-3); margin-bottom: 12px; min-height: 42px; }
.module-card .mod-link { font-size: 13.5px; font-weight: 600; }

/* ---------- 产品卡片 ---------- */
.product-card .prod-img { height: 210px; background: linear-gradient(160deg, #eef3f9, #dde7f3); display: flex; align-items: center; justify-content: center; overflow: hidden; }
.product-card .prod-img img { width: 100%; height: 100%; object-fit: cover; }
.product-card .prod-icon { font-size: 64px; }
.product-card h3 { font-size: 19px; color: var(--blue-deep); display: flex; align-items: center; gap: 8px; flex-wrap: wrap; }
.product-card .prod-pos { color: var(--ink-3); font-size: 13.5px; margin: 4px 0 12px; }
.prod-specs { display: grid; grid-template-columns: 1fr 1fr; gap: 8px; margin-bottom: 16px; }
.prod-specs .spec { background: var(--bg); border-radius: 8px; padding: 8px 10px; font-size: 12.5px; color: var(--ink-3); }
.prod-specs .spec b { display: block; color: var(--ink); font-size: 14px; }
.prod-actions { display: flex; gap: 10px; }
.prod-actions .btn { flex: 1; }

/* ---------- 文章列表 ---------- */
.article-card { display: flex; flex-direction: column; height: 100%; }
.article-card .card-body { flex: 1; display: flex; flex-direction: column; }
.article-card h3 { font-size: 17px; line-height: 1.5; margin: 10px 0 8px; }
.article-card h3 a { color: var(--ink); }
.article-card h3 a:hover { color: var(--blue); }
.article-card .excerpt { color: var(--ink-3); font-size: 13.5px; flex: 1; margin-bottom: 14px; }
.article-meta { display: flex; align-items: center; gap: 14px; font-size: 12.5px; color: var(--ink-3); }
.article-meta .author { color: var(--blue); font-weight: 600; }

/* ---------- 筛选条 ---------- */
.filter-bar { display: flex; gap: 10px; flex-wrap: wrap; margin-bottom: 28px; align-items: center; }
.filter-chip {
  padding: 7px 18px; border-radius: 20px; border: 1.5px solid var(--line); background: #fff;
  font-size: 14px; color: var(--ink-2); transition: all .15s;
}
.filter-chip:hover { border-color: var(--blue); color: var(--blue); }
.filter-chip.active { background: var(--blue); border-color: var(--blue); color: #fff; font-weight: 600; }
.filter-search { margin-left: auto; min-width: 220px; }

/* ---------- 菜谱卡片 ---------- */
.recipe-card h3 { font-size: 17px; color: var(--ink); margin-bottom: 4px; }
.recipe-head { display: flex; justify-content: space-between; align-items: flex-start; margin-bottom: 10px; }
.recipe-params { display: grid; grid-template-columns: repeat(3, 1fr); gap: 8px; margin: 12px 0; }
.recipe-params .rp {
  background: var(--blue-light); border-radius: 8px; text-align: center; padding: 8px 4px;
}
.recipe-params .rp b { display: block; color: var(--blue-deep); font-size: 15px; font-family: var(--mono); }
.recipe-params .rp span { font-size: 11.5px; color: var(--ink-3); }
.recipe-steps { font-size: 13.5px; color: var(--ink-2); background: var(--bg); border-radius: 8px; padding: 12px 14px; }
.recipe-steps ol { margin-left: 18px; }
.recipe-steps li { margin-bottom: 4px; }

/* ---------- 开源图纸卡片 ---------- */
.os-card .os-head { display: flex; justify-content: space-between; align-items: flex-start; gap: 10px; margin-bottom: 10px; }
.os-card h3 { font-size: 17px; color: var(--blue-deep); }
.os-card .os-desc { color: var(--ink-2); font-size: 14px; margin-bottom: 14px; }
.os-card .os-items { list-style: none; margin-bottom: 16px; }
.os-card .os-items li { font-size: 13.5px; color: var(--ink-2); padding: 5px 0; border-bottom: 1px dashed var(--line); }
.os-card .os-items li::before { content: "📄 "; }
.os-meta { display: flex; gap: 16px; font-size: 12.5px; color: var(--ink-3); margin-bottom: 14px; }

/* ---------- 社区 ---------- */
.post-item {
  background: #fff; border: 1px solid var(--line); border-radius: var(--radius-sm);
  padding: 18px 20px; margin-bottom: 14px; transition: box-shadow .15s;
}
.post-item:hover { box-shadow: var(--shadow-lg); }
.post-item h3 { font-size: 16.5px; margin-bottom: 6px; }
.post-item h3 a { color: var(--ink); }
.post-item h3 a:hover { color: var(--blue); }
.post-item .post-excerpt { color: var(--ink-3); font-size: 13.5px; margin-bottom: 10px; }
.post-meta { display: flex; gap: 16px; font-size: 12.5px; color: var(--ink-3); flex-wrap: wrap; }
.post-meta .solved { color: var(--green); font-weight: 600; }
.post-stats { display: flex; gap: 14px; }

/* ---------- ROI计算器 ---------- */
.roi-panel { display: grid; grid-template-columns: 1fr 1fr; gap: 30px; }
.roi-inputs label { display: block; font-weight: 600; font-size: 14px; margin: 18px 0 6px; }
.roi-inputs label .val { color: var(--blue); font-family: var(--mono); float: right; }
.roi-inputs input[type=range] { width: 100%; accent-color: var(--blue); }
.roi-result {
  background: linear-gradient(150deg, var(--blue-deep), var(--blue)); color: #fff;
  border-radius: var(--radius); padding: 28px;
}
.roi-result .big { font-size: 42px; font-weight: 800; color: var(--gold); font-family: var(--mono); line-height: 1.2; }
.roi-result .row { display: flex; justify-content: space-between; padding: 9px 0; border-bottom: 1px dashed rgba(255,255,255,.2); font-size: 14px; }
.roi-result .row b { font-family: var(--mono); }

/* ---------- 时间轴 ---------- */
.timeline { position: relative; padding-left: 32px; }
.timeline::before { content: ""; position: absolute; left: 9px; top: 6px; bottom: 6px; width: 2px; background: var(--line); }
.tl-item { position: relative; padding-bottom: 28px; }
.tl-item::before {
  content: ""; position: absolute; left: -29px; top: 7px; width: 12px; height: 12px;
  border-radius: 50%; background: var(--gold); border: 3px solid #fff; box-shadow: 0 0 0 2px var(--gold);
}
.tl-item .tl-year { font-weight: 800; color: var(--blue); font-size: 17px; font-family: var(--mono); }
.tl-item p { color: var(--ink-2); font-size: 14.5px; }

/* ---------- 问卷推荐 ---------- */
.quiz-option {
  display: block; width: 100%; text-align: left; background: #fff; border: 1.5px solid var(--line);
  border-radius: 10px; padding: 14px 18px; margin-bottom: 10px; font-size: 15px; transition: all .15s;
}
.quiz-option:hover { border-color: var(--blue); background: var(--blue-light); }
.quiz-progress { height: 6px; background: var(--line); border-radius: 3px; margin-bottom: 22px; overflow: hidden; }
.quiz-progress .bar { height: 100%; background: var(--gold); transition: width .3s; }

/* ---------- 提示横幅 ---------- */
.notice-strip {
  background: var(--gold-light); border: 1px solid #f0d890; border-radius: var(--radius-sm);
  padding: 12px 18px; font-size: 13.5px; color: #7a6210; margin-bottom: 24px;
}

/* ---------- 空状态 ---------- */
.empty { text-align: center; color: var(--ink-3); padding: 50px 0; }
.empty .icon { font-size: 46px; margin-bottom: 10px; }

/* ---------- 登录/注册 ---------- */
.auth-wrap { max-width: 440px; margin: 0 auto; }
.auth-tabs { display: flex; border-bottom: 2px solid var(--line); margin-bottom: 24px; }
.auth-tabs button {
  flex: 1; background: none; border: none; padding: 12px; font-size: 16px;
  color: var(--ink-3); font-weight: 600; border-bottom: 3px solid transparent; margin-bottom: -2px;
}
.auth-tabs button.active { color: var(--blue); border-bottom-color: var(--gold); }
.auth-err { background: #fdeceb; color: var(--red); border-radius: 8px; padding: 10px 14px; font-size: 13.5px; margin-bottom: 14px; display: none; }

/* ---------- 个人中心 / 管理后台 ---------- */
.stat-card { text-align: center; padding: 22px 14px; }
.stat-card b { display: block; font-size: 30px; color: var(--blue); font-family: var(--mono); }
.stat-card span { font-size: 13px; color: var(--ink-3); }
.admin-section { margin-bottom: 38px; }
.admin-section h2 { font-size: 20px; color: var(--blue-deep); margin-bottom: 14px; }
.admin-bar { display: flex; gap: 10px; align-items: center; margin-bottom: 14px; flex-wrap: wrap; }
table.data .op-btn {
  background: none; border: 1px solid var(--line); border-radius: 6px;
  padding: 3px 10px; font-size: 12.5px; color: var(--ink-2); margin-right: 6px;
}
table.data .op-btn:hover { border-color: var(--blue); color: var(--blue); }
table.data .op-btn.danger:hover { border-color: var(--red); color: var(--red); }
.bar-row { display: flex; align-items: center; gap: 10px; margin-bottom: 9px; font-size: 13px; }
.bar-row .bar-label { width: 90px; text-align: right; color: var(--ink-2); flex-shrink: 0; }
.bar-row .bar-track { flex: 1; background: var(--bg); border-radius: 5px; height: 22px; overflow: hidden; }
.bar-row .bar-fill { height: 100%; background: linear-gradient(90deg, var(--blue), #1d6cc4); border-radius: 5px; min-width: 2px; }
.bar-row .bar-val { width: 40px; font-family: var(--mono); color: var(--blue-deep); font-weight: 700; }

/* ---------- 知识库 ---------- */
.kb-layout { display: grid; grid-template-columns: 230px 1fr; gap: 28px; align-items: start; }
.kb-side { position: sticky; top: 84px; }
.kb-side .kb-cat {
  display: block; width: 100%; text-align: left; background: none; border: none;
  padding: 10px 14px; border-radius: 8px; font-size: 14.5px; color: var(--ink-2); margin-bottom: 2px;
}
.kb-side .kb-cat:hover { background: var(--blue-light); color: var(--blue); }
.kb-side .kb-cat.active { background: var(--blue); color: #fff; font-weight: 600; }
.kb-item {
  background: #fff; border: 1px solid var(--line); border-radius: var(--radius-sm);
  margin-bottom: 12px; overflow: hidden;
}
.kb-item summary {
  list-style: none; cursor: pointer; padding: 15px 18px; font-weight: 600;
  font-size: 15.5px; color: var(--ink); display: flex; justify-content: space-between; gap: 10px;
}
.kb-item summary::-webkit-details-marker { display: none; }
.kb-item summary::after { content: "+"; color: var(--blue); font-size: 19px; font-weight: 400; }
.kb-item[open] summary { border-bottom: 1px solid var(--line); color: var(--blue-deep); }
.kb-item[open] summary::after { content: "−"; }
.kb-item .kb-body { padding: 16px 18px; font-size: 14.5px; color: var(--ink-2); line-height: 1.85; }
.kb-item .kb-body table { width: 100%; border-collapse: collapse; margin: 10px 0; font-size: 13.5px; }
.kb-item .kb-body th { background: var(--blue-deep); color: #fff; padding: 7px 10px; text-align: left; }
.kb-item .kb-body td { padding: 6px 10px; border: 1px solid var(--line); }

/* ---------- 行业动态 ---------- */
.news-item {
  display: flex; gap: 16px; background: #fff; border: 1px solid var(--line);
  border-radius: var(--radius-sm); padding: 16px 18px; margin-bottom: 12px;
}
.news-date {
  flex-shrink: 0; width: 64px; text-align: center; background: var(--blue-light);
  border-radius: 8px; padding: 8px 4px; height: fit-content;
}
.news-date b { display: block; font-size: 20px; color: var(--blue-deep); font-family: var(--mono); line-height: 1.2; }
.news-date span { font-size: 11px; color: var(--ink-3); }
.news-item h3 { font-size: 15.5px; margin-bottom: 5px; color: var(--ink); }
.news-item p { font-size: 13.5px; color: var(--ink-3); }
.hot-card { border-left: 4px solid var(--gold); margin-bottom: 16px; }
.hot-card h3 { font-size: 16px; color: var(--blue-deep); margin-bottom: 8px; }
.hot-card .hot-view { background: var(--blue-light); border-radius: 8px; padding: 10px 14px; font-size: 13.5px; color: var(--blue-deep); margin-top: 10px; }

/* ---------- 案例中心 ---------- */
.case-card .case-top { display: flex; justify-content: space-between; align-items: flex-start; gap: 10px; margin-bottom: 8px; }
.case-card h3 { font-size: 17.5px; color: var(--blue-deep); }
.case-pain { font-size: 13.5px; color: var(--ink-3); margin-bottom: 12px; }
.case-solution {
  background: var(--bg); border-radius: 8px; padding: 10px 14px;
  font-size: 13.5px; color: var(--ink-2); margin-bottom: 14px;
}
.case-metrics { display: grid; grid-template-columns: repeat(3, 1fr); gap: 8px; margin-bottom: 14px; }
.case-metrics .cm { background: var(--blue-light); border-radius: 8px; text-align: center; padding: 9px 4px; }
.case-metrics .cm b { display: block; color: var(--blue-deep); font-size: 16px; font-family: var(--mono); }
.case-metrics .cm span { font-size: 11.5px; color: var(--ink-3); }
.case-quote {
  border-left: 3px solid var(--gold); padding: 4px 12px; font-size: 13px;
  color: var(--ink-2); font-style: italic;
}

/* ---------- 配件商城 ---------- */
.part-card .part-head { display: flex; align-items: flex-start; gap: 12px; margin-bottom: 10px; }
.part-card .part-icon { font-size: 34px; line-height: 1; }
.part-card h3 { font-size: 16px; color: var(--ink); }
.part-card .part-spec { font-size: 12.5px; color: var(--ink-3); }
.part-price { display: flex; align-items: baseline; gap: 6px; margin: 10px 0; }
.part-price b { font-size: 22px; color: var(--red); font-family: var(--mono); }
.part-price small { color: var(--ink-3); font-size: 12px; }
.part-note { font-size: 12.5px; color: var(--ink-3); background: var(--bg); border-radius: 7px; padding: 8px 10px; margin-bottom: 12px; }
.cart-fab {
  position: fixed; right: 22px; bottom: 26px; z-index: 300;
  background: var(--blue); color: #fff; border: none; border-radius: 30px;
  padding: 13px 22px; font-size: 15px; font-weight: 700; box-shadow: var(--shadow-lg);
}
.cart-fab:hover { background: var(--blue-deep); }
.cart-fab .cart-n { background: var(--gold); color: var(--blue-darker); border-radius: 50%; padding: 1px 8px; margin-left: 6px; font-family: var(--mono); }
.cart-drawer {
  position: fixed; top: 0; right: -420px; width: 400px; max-width: 94vw; height: 100vh;
  background: #fff; z-index: 400; box-shadow: -8px 0 30px rgba(13,58,110,.2);
  transition: right .25s; display: flex; flex-direction: column;
}
.cart-drawer.open { right: 0; }
.cart-drawer .cd-head { padding: 18px 20px; border-bottom: 1px solid var(--line); display: flex; justify-content: space-between; align-items: center; }
.cart-drawer .cd-head h3 { font-size: 17px; color: var(--blue-deep); }
.cart-drawer .cd-body { flex: 1; overflow-y: auto; padding: 14px 20px; }
.cart-drawer .cd-foot { padding: 16px 20px; border-top: 1px solid var(--line); background: var(--bg); }
.cart-line { display: flex; align-items: center; gap: 10px; padding: 10px 0; border-bottom: 1px dashed var(--line); font-size: 14px; }
.cart-line .cl-name { flex: 1; }
.cart-line .cl-name small { display: block; color: var(--ink-3); font-size: 11.5px; }
.qty-btn { width: 26px; height: 26px; border-radius: 6px; border: 1px solid var(--line); background: #fff; font-size: 15px; line-height: 1; }
.qty-btn:hover { border-color: var(--blue); color: var(--blue); }
.cart-mask { position: fixed; inset: 0; background: rgba(9,42,82,.35); z-index: 350; display: none; }
.cart-mask.show { display: block; }

/* ---------- 视频学院 ---------- */
.course-card .course-thumb {
  height: 150px; display: flex; align-items: center; justify-content: center;
  background: linear-gradient(135deg, var(--blue-darker), var(--blue)); position: relative;
}
.course-card .course-thumb .play { font-size: 44px; opacity: .92; }
.course-card .course-thumb .dur {
  position: absolute; right: 10px; bottom: 8px; background: rgba(0,0,0,.55);
  color: #fff; font-size: 11.5px; padding: 2px 8px; border-radius: 4px; font-family: var(--mono);
}
.course-card h3 { font-size: 15.5px; line-height: 1.5; margin-bottom: 6px; color: var(--ink); }

/* ---------- 全站搜索 ---------- */
.search-hit { margin-bottom: 14px; }
.search-hit h3 { font-size: 16px; margin-bottom: 4px; }
.search-hit .hit-snippet { font-size: 13.5px; color: var(--ink-3); }
.search-hit mark { background: var(--gold-light); color: var(--gold-dark); padding: 0 2px; border-radius: 3px; font-weight: 700; }
.search-group-title { font-size: 15px; color: var(--blue-deep); margin: 26px 0 12px; padding-left: 10px; border-left: 4px solid var(--gold); font-weight: 700; }

/* ---------- 收藏按钮 ---------- */
.fav-btn {
  background: none; border: none; font-size: 19px; line-height: 1; color: #c9d4e2;
  padding: 2px 4px; transition: transform .15s;
}
.fav-btn:hover { transform: scale(1.2); }
.fav-btn.faved { color: var(--gold); }

/* ============================================================
   Apple 风格产品展示（J40 主推页 / 首页与产品中心重点位）
   大字、留白、居中、细链接、滚动渐显
   ============================================================ */
.ap { font-family: var(--font); -webkit-font-smoothing: antialiased; }
.ap-light { background: #f5f5f7; color: #1d1d1f; }
.ap-white { background: #fff; color: #1d1d1f; }
.ap-dark { background: #000; color: #f5f5f7; }
.ap-pad { padding: 88px 0 96px; }
.ap-eyebrow { font-size: 17px; font-weight: 600; color: var(--gold-dark); letter-spacing: .02em; margin-bottom: 10px; }
.ap-dark .ap-eyebrow { color: var(--gold); }
.ap-title {
  font-size: clamp(42px, 7vw, 84px); font-weight: 800; letter-spacing: -.015em;
  line-height: 1.06; margin-bottom: 14px;
}
.ap-headline {
  font-size: clamp(30px, 4.6vw, 54px); font-weight: 800; letter-spacing: -.012em;
  line-height: 1.12; margin-bottom: 14px;
}
.ap-sub {
  font-size: clamp(18px, 2.2vw, 25px); font-weight: 500; color: #6e6e73;
  line-height: 1.45; max-width: 760px; margin: 0 auto 22px;
}
.ap-dark .ap-sub { color: #a1a1a6; }
.ap-center { text-align: center; }
.ap-links { display: flex; gap: 30px; justify-content: center; flex-wrap: wrap; font-size: 19px; }
.ap-links a { color: #0066cc; font-weight: 500; }
.ap-links a:hover { text-decoration: underline; color: #0066cc; }
.ap-links a::after { content: " ›"; }
.ap-dark .ap-links a { color: #2997ff; }
.ap-img-wrap { max-width: 980px; margin: 40px auto 0; }
.ap-img-wrap img { border-radius: 22px; box-shadow: 0 24px 70px rgba(0,0,0,.16); width: 100%; }
.ap-dark .ap-img-wrap img { box-shadow: 0 24px 70px rgba(0,0,0,.55); }

/* 巨幅数据 */
.ap-stats { display: grid; grid-template-columns: repeat(4, 1fr); gap: 30px; max-width: 1040px; margin: 0 auto; }
.ap-stats .as b {
  display: block; font-size: clamp(34px, 4.4vw, 56px); font-weight: 800; letter-spacing: -.02em;
  background: linear-gradient(90deg, var(--gold), #ffd968); -webkit-background-clip: text; background-clip: text; color: transparent;
  line-height: 1.15;
}
.ap-stats .as span { font-size: 15px; color: #a1a1a6; font-weight: 500; }
.ap-light .ap-stats .as b, .ap-white .ap-stats .as b {
  background: linear-gradient(90deg, var(--blue-deep), #1d6cc4); -webkit-background-clip: text; background-clip: text;
}
.ap-light .ap-stats .as span, .ap-white .ap-stats .as span { color: #6e6e73; }

/* 特性区（图文交替） */
.ap-feature { display: grid; grid-template-columns: 1fr 1.15fr; gap: 56px; align-items: center; max-width: 1100px; margin: 0 auto; }
.ap-feature.rev { grid-template-columns: 1.15fr 1fr; }
.ap-feature .af-copy h3 { font-size: clamp(26px, 3.4vw, 40px); font-weight: 800; letter-spacing: -.01em; line-height: 1.15; margin-bottom: 14px; }
.ap-feature .af-copy p { font-size: 17px; line-height: 1.7; color: #6e6e73; margin-bottom: 10px; }
.ap-dark .ap-feature .af-copy p { color: #a1a1a6; }
.ap-feature .af-copy .af-points { list-style: none; margin: 14px 0 18px; }
.ap-feature .af-copy .af-points li { font-size: 15.5px; padding: 5px 0; color: #1d1d1f; font-weight: 500; }
.ap-dark .ap-feature .af-copy .af-points li { color: #f5f5f7; }
.ap-feature .af-copy .af-points li::before { content: "✓  "; color: var(--gold-dark); font-weight: 800; }
.ap-feature img { width: 100%; border-radius: 20px; box-shadow: 0 18px 50px rgba(0,0,0,.14); }

/* 横滑图集 */
.ap-gallery { display: flex; gap: 18px; overflow-x: auto; padding: 6px 4px 18px; scroll-snap-type: x mandatory; }
.ap-gallery::-webkit-scrollbar { height: 8px; }
.ap-gallery::-webkit-scrollbar-thumb { background: #d2d2d7; border-radius: 4px; }
.ap-gallery img {
  height: 320px; border-radius: 16px; scroll-snap-align: start; flex-shrink: 0;
  box-shadow: 0 10px 30px rgba(0,0,0,.12);
}

/* 规格表（Apple Tech Specs 风） */
.ap-specs { max-width: 880px; margin: 0 auto; }
.ap-specs .sp-row { display: grid; grid-template-columns: 220px 1fr; gap: 20px; padding: 15px 6px; border-bottom: 1px solid #d2d2d7; font-size: 15.5px; }
.ap-specs .sp-row dt { color: #6e6e73; font-weight: 600; }
.ap-specs .sp-row dd { color: #1d1d1f; }

/* J40 专页吸顶子导航 */
.ap-subnav {
  position: sticky; top: 64px; z-index: 90;
  background: rgba(255,255,255,.82); backdrop-filter: saturate(180%) blur(14px);
  border-bottom: 1px solid rgba(0,0,0,.08);
}
.ap-subnav .sn-bar { display: flex; align-items: center; height: 52px; gap: 22px; }
.ap-subnav .sn-name { font-size: 19px; font-weight: 700; color: #1d1d1f; flex: 1; }
.ap-subnav a { font-size: 13.5px; color: #424245; white-space: nowrap; }
.ap-subnav a:hover { color: #0066cc; }
.ap-subnav .sn-cta {
  background: var(--gold); color: var(--blue-darker); font-weight: 700;
  padding: 6px 16px; border-radius: 20px; font-size: 13.5px;
}
.ap-subnav .sn-cta:hover { background: var(--gold-dark); color: var(--blue-darker); }

/* 滚动渐显 */
.reveal { opacity: 0; transform: translateY(26px); transition: opacity .7s ease, transform .7s ease; }
.reveal.in { opacity: 1; transform: none; }

@media (max-width: 880px) {
  .ap-feature, .ap-feature.rev { grid-template-columns: 1fr; gap: 26px; }
  .ap-stats { grid-template-columns: repeat(2, 1fr); }
  .ap-specs .sp-row { grid-template-columns: 1fr; gap: 2px; }
  .ap-subnav .sn-bar { overflow-x: auto; }
  .ap-pad { padding: 56px 0 60px; }
  .ap-gallery img { height: 220px; }
}

/* ---------- 响应式 ---------- */
@media (max-width: 980px) {
  .grid-4 { grid-template-columns: repeat(2, 1fr); }
  .grid-3 { grid-template-columns: repeat(2, 1fr); }
  .hero-inner { grid-template-columns: 1fr; }
  .hero-img { display: none; }
  .footer-main { grid-template-columns: 1fr 1fr; }
  .roi-panel { grid-template-columns: 1fr; }
}
@media (max-width: 980px) {
  .kb-layout { grid-template-columns: 1fr; }
  .kb-side { position: static; display: flex; flex-wrap: wrap; gap: 6px; }
  .kb-side .kb-cat { width: auto; }
}
@media (max-width: 1080px) {
  /* 中屏即收起为汉堡菜单，保证导航永远单行 */
  .nav-links {
    display: none; position: absolute; top: 64px; left: 0; right: 0;
    background: #fff; flex-direction: column; padding: 12px 20px 18px;
    border-bottom: 1px solid var(--line); box-shadow: var(--shadow-lg);
  }
  .nav-links a, .nav-drop > a { font-size: 15px; padding: 8px 13px; }
  .nav-links.open { display: flex; }
  .nav-toggle { display: block; margin-left: auto; }
  .nav-drop .drop-panel { display: none; position: static; box-shadow: none; border: none; padding-left: 16px; }
  .nav-drop.open-group .drop-panel { display: block; }
}
@media (max-width: 680px) {
  .nav-cta { display: none; }
  .grid-2, .grid-3, .grid-4 { grid-template-columns: 1fr; }
  .hero-inner h1 { font-size: 29px; }
  .footer-main { grid-template-columns: 1fr; }
  .filter-search { margin-left: 0; width: 100%; }
}