/* ============================================================
   大小尖科技 · 官网样式
   ============================================================ */
:root {
  --dark: #0f172a;
  --gray: #64748b;
  --gray-light: #f1f5f9;
  --border: #e2e8f0;
  --radius: 12px;
  --shadow: 0 10px 30px rgba(15, 23, 42, 0.08);
  --shadow-lg: 0 20px 50px rgba(15, 23, 42, 0.12);
}

/* ===== 主题一：蓝色系（默认） ===== */
:root,
[data-theme="blue"] {
  --primary: #2563eb;
  --primary-dark: #1d4ed8;
  --primary-light: #eff6ff;
  --accent: #0ea5e9;
  --hero-grad: linear-gradient(135deg, #0f172a 0%, #1e3a8a 55%, #2563eb 100%);
  --hero-glow: rgba(14, 165, 233, 0.35);
  --hero-span: #7dd3fc;
  --card-hover-border: #c7d7f5;
  --feature-text: #1e40af;
  --focus-ring: rgba(37, 99, 235, 0.12);
}

/* ===== 主题二：珊瑚橙系（暖色，与尖手活视觉统一） ===== */
[data-theme="coral"] {
  --primary: #f96d3c;
  --primary-dark: #d95a2b;
  --primary-light: #fff0e8;
  --accent: #ff9f68;
  --hero-grad: linear-gradient(135deg, #33150a 0%, #a8431a 55%, #f96d3c 100%);
  --hero-glow: rgba(249, 109, 60, 0.35);
  --hero-span: #ffd0ae;
  --card-hover-border: #ffd6c2;
  --feature-text: #c2410c;
  --focus-ring: rgba(249, 109, 60, 0.15);
}

/* ===== 主题三：墨绿色系 ===== */
[data-theme="green"] {
  --primary: #167d5b;
  --primary-dark: #0e6146;
  --primary-light: #e6f4ec;
  --accent: #2e9e74;
  --hero-grad: linear-gradient(135deg, #0c1f18 0%, #0e4d3a 55%, #167d5b 100%);
  --hero-glow: rgba(46, 158, 116, 0.35);
  --hero-span: #a7e3c1;
  --card-hover-border: #bcdccd;
  --feature-text: #14532d;
  --focus-ring: rgba(22, 125, 91, 0.15);
}

/* ===== 主题四：黑色系（深色模式） ===== */
[data-theme="black"] {
  --primary: #60a5fa;
  --primary-dark: #3b82f6;
  --primary-light: #1e3a5f;
  --accent: #38bdf8;
  --hero-grad: linear-gradient(135deg, #0b0f19 0%, #111827 55%, #1e293b 100%);
  --hero-glow: rgba(96, 165, 250, 0.30);
  --hero-span: #93c5fd;
  --card-hover-border: #3b475b;
  --feature-text: #bfdbfe;
  --focus-ring: rgba(96, 165, 250, 0.20);
  --dark: #e5e7eb;
  --gray: #94a3b8;
  --gray-light: #1e293b;
  --border: #2b3444;
}
/* 黑色主题 · 组件深色覆盖 */
[data-theme="black"] body { background: #0f1117; color: var(--dark); }
[data-theme="black"] .site-header { background: rgba(15, 17, 23, 0.92); }
[data-theme="black"] .logo-text, [data-theme="black"] .logo { color: var(--dark); }
[data-theme="black"] .main-nav a, [data-theme="black"] .nav-toggle { color: var(--dark); }
[data-theme="black"] .main-nav a.active, [data-theme="black"] .main-nav a:hover { color: var(--primary); }
[data-theme="black"] .theme-switch { background: #1a2130; }
[data-theme="black"] .theme-dot { border-color: #11151c; }
[data-theme="black"] .stats-bar,
[data-theme="black"] .card,
[data-theme="black"] .project-card,
[data-theme="black"] .news-card,
[data-theme="black"] .value-item,
[data-theme="black"] .detail-card,
[data-theme="black"] .article,
[data-theme="black"] .side-list,
[data-theme="black"] .contact-form { background: #161b24; border-color: var(--border); }
[data-theme="black"] .project-card:hover { border-color: var(--card-hover-border); }
[data-theme="black"] .biz-tag { background: #1e293b; color: #cbd5e1; border-color: var(--border); }
[data-theme="black"] .biz-tag:hover { color: var(--primary); background: var(--primary-light); border-color: var(--primary); }
[data-theme="black"] .about-vision { background: #1e293b; }
[data-theme="black"] .detail-card p, [data-theme="black"] .article .content p,
[data-theme="black"] .side-list li a { color: #cbd5e1; }
[data-theme="black"] .side-list li a:hover { color: var(--primary); }
[data-theme="black"] .biz-note { background: #2a1f12; border-color: #7c4a12; color: #fdba74; }
[data-theme="black"] .btn-ghost { background: #1e293b; color: var(--dark); }
[data-theme="black"] .btn-ghost:hover { background: #334155; }
[data-theme="black"] .form-group input, [data-theme="black"] .form-group textarea, [data-theme="black"] .form-group select,
[data-theme="black"] .verify-form input { background: #0f1117; color: var(--dark); border-color: var(--border); }
[data-theme="black"] .release-list > li { background: #161b24; border-color: var(--border); }
[data-theme="black"] .release-note p, [data-theme="black"] .dl-version, [data-theme="black"] .dl-verify p,
[data-theme="black"] .dl-tip, [data-theme="black"] .dl-empty { color: #cbd5e1; }
[data-theme="black"] .dl-tip, [data-theme="black"] .dl-empty { color: var(--gray); }
[data-theme="black"] .site-footer { background: #0a0c10; }
[data-theme="black"] .footer-bottom a { color: #94a3b8; }
@media (max-width: 900px) {
  [data-theme="black"] .main-nav { background: #161b24; box-shadow: var(--shadow); }
}

/* ===== 主题五：浅灰系（浅灰中性色模板） ===== */
[data-theme="gray"] {
  --primary: #64748b;
  --primary-dark: #475569;
  --primary-light: #e7eaee;
  --accent: #64748b;
  --hero-grad: linear-gradient(135deg, #1e293b 0%, #334155 55%, #4b5563 100%);
  --hero-glow: rgba(100, 116, 139, 0.35);
  --hero-span: #cbd5e1;
  --card-hover-border: #c2c9d2;
  --feature-text: #475569;
  --focus-ring: rgba(100, 116, 139, 0.15);
  --dark: #1f2937;
  --gray-light: #e3e6ea;
  --border: #d5d9df;
}
[data-theme="gray"] body { background: #eef0f3; }
[data-theme="gray"] .site-header { background: rgba(238, 240, 243, 0.95); }
[data-theme="gray"] .site-footer { background: #1f2937; }
[data-theme="gray"] .biz-note { background: #f6f7f8; border-color: #d0d5db; color: #64748b; }

* { margin: 0; padding: 0; box-sizing: border-box; }
html { scroll-behavior: smooth; }
body { font-family: "PingFang SC", "Microsoft YaHei", "Segoe UI", sans-serif; color: var(--dark); line-height: 1.7; background: #fff; }
a { color: var(--primary); text-decoration: none; }
a:hover { color: var(--primary-dark); }
img { max-width: 100%; display: block; }
.container { max-width: 1200px; margin: 0 auto; padding: 0 24px; }
section { padding: 80px 0; }
.section-head { text-align: center; max-width: 720px; margin: 0 auto 48px; }
.section-head .tag { display: inline-block; background: var(--primary-light); color: var(--primary); font-size: 13px; font-weight: 600; padding: 4px 16px; border-radius: 20px; margin-bottom: 12px; }
.section-head h2 { font-size: 34px; font-weight: 800; letter-spacing: 1px; }
.section-head p { color: var(--gray); margin-top: 12px; }

/* ---------- 头部 ---------- */
.site-header { position: sticky; top: 0; z-index: 100; background: rgba(255,255,255,0.95); backdrop-filter: blur(10px); border-bottom: 1px solid var(--border); }
.header-inner { display: flex; align-items: center; justify-content: space-between; height: 68px; }
.logo { display: flex; align-items: center; gap: 10px; color: var(--dark); }
.logo-img { width: 40px; height: 40px; border-radius: 10px; object-fit: cover; background: #fff; }
.logo-mark { width: 40px; height: 40px; border-radius: 10px; background: linear-gradient(135deg, var(--primary), var(--accent)); color: #fff; font-weight: 800; font-size: 20px; display: flex; align-items: center; justify-content: center; }

/* ---------- 主题切换 ---------- */
.theme-switch { display: flex; align-items: center; gap: 6px; margin-left: 10px; padding: 5px 7px; background: var(--gray-light); border-radius: 24px; }
.theme-dot { width: 22px; height: 22px; border-radius: 50%; border: 2px solid #fff; cursor: pointer; padding: 0; transition: transform .2s, box-shadow .2s; box-shadow: 0 1px 3px rgba(0,0,0,0.25); }
.theme-dot:hover { transform: scale(1.15); }
.theme-dot.blue { background: linear-gradient(135deg, #2563eb, #0ea5e9); }
.theme-dot.coral { background: linear-gradient(135deg, #f96d3c, #ffb089); }
.theme-dot.green { background: linear-gradient(135deg, #167d5b, #4cc08f); }
.theme-dot.black { background: linear-gradient(135deg, #334155, #111827); }
.theme-dot.gray { background: linear-gradient(135deg, #e5e7eb, #9aa3af); }
.theme-dot.active { outline: 2px solid var(--dark); outline-offset: 1px; transform: scale(1.1); }
.logo-text { font-size: 19px; font-weight: 800; color: var(--dark); }
.logo-text small { font-size: 11px; font-weight: 400; color: var(--gray); margin-left: 6px; }
.main-nav { display: flex; gap: 8px; }
.main-nav a { padding: 8px 16px; border-radius: 8px; font-size: 15px; color: var(--dark); font-weight: 500; transition: all .2s; }
.main-nav a:hover { color: var(--primary); background: var(--primary-light); }
.main-nav a.active { color: var(--primary); background: var(--primary-light); font-weight: 600; }
.nav-toggle { display: none; background: none; border: none; font-size: 24px; cursor: pointer; color: var(--dark); }

/* ---------- Hero ---------- */
.hero { background: var(--hero-grad); color: #fff; padding: 120px 0 100px; position: relative; overflow: hidden; }
.hero::after { content: ""; position: absolute; right: -120px; top: -120px; width: 420px; height: 420px; border-radius: 50%; background: radial-gradient(circle, var(--hero-glow), transparent 70%); }
.hero-inner { position: relative; z-index: 2; max-width: 800px; }
.hero .badge { display: inline-block; background: rgba(255,255,255,0.15); border: 1px solid rgba(255,255,255,0.25); padding: 6px 18px; border-radius: 24px; font-size: 14px; margin-bottom: 22px; }
.hero h1 { font-size: 48px; font-weight: 800; line-height: 1.25; margin-bottom: 20px; letter-spacing: 1px; }
.hero h1 span { color: var(--hero-span); }
.hero p { font-size: 17px; opacity: 0.9; max-width: 640px; margin-bottom: 32px; }
.hero-actions { display: flex; gap: 14px; flex-wrap: wrap; }
.btn { display: inline-block; padding: 12px 30px; border-radius: 10px; font-weight: 600; font-size: 15px; transition: all .2s; border: none; cursor: pointer; }
.btn-primary { background: #fff; color: var(--primary-dark); }
.btn-primary:hover { transform: translateY(-2px); box-shadow: 0 10px 24px rgba(0,0,0,0.2); color: var(--primary-dark); }
.btn-outline { background: transparent; color: #fff; border: 1.5px solid rgba(255,255,255,0.6); }
.btn-outline:hover { background: rgba(255,255,255,0.1); border-color: #fff; }
.btn-blue { background: var(--primary); color: #fff; }
.btn-blue:hover { background: var(--primary-dark); transform: translateY(-2px); }
.btn-ghost { background: var(--gray-light); color: var(--dark); }
.btn-ghost:hover { background: var(--border); }

/* ---------- 数据条 ---------- */
.stats-bar { background: #fff; border-radius: var(--radius); box-shadow: var(--shadow-lg); margin-top: -56px; position: relative; z-index: 5; padding: 32px; display: grid; grid-template-columns: repeat(4, 1fr); gap: 20px; }
.stat-item { text-align: center; padding: 8px; }
.stat-item .num { font-size: 36px; font-weight: 800; color: var(--primary); }
.stat-item .label { color: var(--gray); font-size: 14px; margin-top: 4px; }

/* ---------- 卡片 ---------- */
.grid-3 { display: grid; grid-template-columns: repeat(3, 1fr); gap: 24px; }
.grid-2 { display: grid; grid-template-columns: repeat(2, 1fr); gap: 24px; }
.card { background: #fff; border: 1px solid var(--border); border-radius: var(--radius); padding: 32px; transition: all .25s; }
.card:hover { transform: translateY(-4px); box-shadow: var(--shadow); border-color: var(--card-hover-border); }
.card .icon-box { width: 52px; height: 52px; border-radius: 12px; display: flex; align-items: center; justify-content: center; margin-bottom: 18px; background: var(--primary-light); }
.card .icon-box svg { width: 26px; height: 26px; stroke: var(--primary); fill: none; stroke-width: 2; stroke-linecap: round; stroke-linejoin: round; }
.card h3 { font-size: 18px; margin-bottom: 10px; }
.card p { color: var(--gray); font-size: 14.5px; }

/* ---------- 项目卡片 ---------- */
.project-card { border-radius: var(--radius); overflow: hidden; border: 1px solid var(--border); background: #fff; transition: all .25s; display: flex; flex-direction: column; }
.project-card:hover { transform: translateY(-4px); box-shadow: var(--shadow-lg); }
.project-cover { height: 180px; display: flex; align-items: center; justify-content: center; color: #fff; position: relative; overflow: hidden; }
.project-cover::after { content: ""; position: absolute; inset: 0; background: linear-gradient(180deg, transparent 55%, rgba(0,0,0,0.35)); }
.project-cover .cover-icon { font-size: 44px; font-weight: 800; opacity: 0.95; }
.project-cover .cover-badge { position: absolute; top: 14px; right: 14px; z-index: 2; background: rgba(255,255,255,0.2); border: 1px solid rgba(255,255,255,0.4); padding: 3px 12px; border-radius: 16px; font-size: 12px; }
.project-body { padding: 24px; flex: 1; display: flex; flex-direction: column; }
.project-body h3 { font-size: 19px; margin-bottom: 6px; }
.project-body .sub { color: var(--accent); font-size: 13.5px; margin-bottom: 12px; font-weight: 500; }
.project-body p { color: var(--gray); font-size: 14px; flex: 1; }
.project-body .more { margin-top: 16px; font-weight: 600; font-size: 14px; }

/* ---------- 新闻 ---------- */
.news-list { display: grid; grid-template-columns: repeat(3, 1fr); gap: 24px; }
.news-card { background: #fff; border: 1px solid var(--border); border-radius: var(--radius); padding: 26px; transition: all .25s; }
.news-card:hover { transform: translateY(-4px); box-shadow: var(--shadow); }
.news-card .date { font-size: 13px; color: var(--gray); margin-bottom: 10px; display: flex; align-items: center; gap: 8px; }
.news-card .cat { display: inline-block; background: var(--primary-light); color: var(--primary); font-size: 12px; padding: 2px 10px; border-radius: 12px; }
.news-card h3 { font-size: 17px; margin-bottom: 10px; line-height: 1.5; }
.news-card p { color: var(--gray); font-size: 14px; }

/* ---------- CTA ---------- */
.cta { background: var(--hero-grad); color: #fff; text-align: center; padding: 80px 0; }
.cta h2 { font-size: 32px; margin-bottom: 14px; }
.cta p { opacity: 0.9; margin-bottom: 28px; }

/* ---------- 页脚 ---------- */
.site-footer { background: var(--dark); color: #cbd5e1; padding-top: 60px; }
.footer-grid { display: grid; grid-template-columns: 2fr 1fr 1.5fr; gap: 40px; padding-bottom: 40px; }
.footer-col h4 { color: #fff; font-size: 16px; margin-bottom: 16px; }
.footer-col p { font-size: 14px; color: #94a3b8; margin-bottom: 10px; }
.footer-col ul { list-style: none; }
.footer-col li { font-size: 14px; color: #94a3b8; margin-bottom: 10px; }
.footer-col li a { color: #94a3b8; }
.footer-col li a:hover { color: #fff; }
.footer-bottom { border-top: 1px solid rgba(255,255,255,0.1); padding: 18px 0; text-align: center; font-size: 13px; color: #64748b; }
.footer-bottom a { color: #94a3b8; }

/* ---------- 内页 Banner ---------- */
.page-banner { background: var(--hero-grad); color: #fff; padding: 80px 0 60px; text-align: center; }
.page-banner h1 { font-size: 38px; font-weight: 800; margin-bottom: 10px; }
.page-banner p { opacity: 0.85; font-size: 16px; }

/* ---------- 关于 ---------- */
.about-block { display: grid; grid-template-columns: 1.1fr 1fr; gap: 48px; align-items: center; }
.about-block .about-text h2 { font-size: 30px; margin-bottom: 18px; }
.about-block .about-text p { color: var(--gray); margin-bottom: 14px; font-size: 15px; }
.about-vision { background: var(--gray-light); border-radius: var(--radius); padding: 36px; border-left: 5px solid var(--primary); }
.about-vision h3 { margin-bottom: 12px; color: var(--primary); }
.values-row { display: grid; grid-template-columns: repeat(4, 1fr); gap: 20px; margin-top: 40px; }
.value-item { text-align: center; background: #fff; border: 1px solid var(--border); border-radius: var(--radius); padding: 26px 16px; }
.value-item .v-num { font-size: 22px; font-weight: 800; color: var(--primary); margin-bottom: 6px; }
.value-item h4 { font-size: 15px; }
.value-item p { color: var(--gray); font-size: 13px; margin-top: 6px; }

/* ---------- 经营范围 ---------- */
.biz-cat { margin-bottom: 40px; }
.biz-cat-header { display: flex; align-items: center; gap: 12px; margin-bottom: 18px; padding-bottom: 12px; border-bottom: 2px solid var(--primary-light); }
.biz-cat-header .no { width: 36px; height: 36px; border-radius: 10px; background: var(--primary); color: #fff; font-weight: 700; display: flex; align-items: center; justify-content: center; font-size: 15px; }
.biz-cat-header h3 { font-size: 19px; }
.biz-tags { display: flex; flex-wrap: wrap; gap: 10px; }
.biz-tag { background: var(--gray-light); border: 1px solid var(--border); border-radius: 8px; padding: 7px 16px; font-size: 14px; color: #334155; transition: all .2s; }
.biz-tag:hover { background: var(--primary-light); border-color: var(--primary); color: var(--primary); }
.biz-note { background: #fff7ed; border: 1px solid #fed7aa; color: #9a3412; border-radius: var(--radius); padding: 18px 22px; font-size: 14px; margin-top: 30px; }

/* ---------- 项目详情 ---------- */
.project-hero { background: var(--hero-grad); color: #fff; padding: 90px 0 70px; }
.project-hero .cat-badge { display: inline-block; background: rgba(255,255,255,0.15); padding: 4px 16px; border-radius: 20px; font-size: 13px; margin-bottom: 16px; }
.project-hero h1 { font-size: 38px; margin-bottom: 10px; }
.project-hero .sub { color: var(--hero-span); font-size: 17px; }
.detail-body { padding: 56px 0; }
.detail-card { background: #fff; border: 1px solid var(--border); border-radius: var(--radius); padding: 36px; box-shadow: var(--shadow); }
.detail-card h3 { font-size: 20px; margin-bottom: 16px; padding-left: 14px; border-left: 4px solid var(--primary); }
.detail-card p { color: #334155; margin-bottom: 12px; }
.feature-list { list-style: none; display: grid; grid-template-columns: 1fr 1fr; gap: 12px; }
.feature-list li { display: flex; align-items: center; gap: 10px; background: var(--primary-light); padding: 12px 16px; border-radius: 10px; font-size: 14px; color: var(--feature-text); }
.feature-list li::before { content: "✓"; font-weight: 800; color: var(--primary); }

/* ---------- 新闻详情 ---------- */
.article { background: #fff; border: 1px solid var(--border); border-radius: var(--radius); padding: 44px; box-shadow: var(--shadow); }
.article h1 { font-size: 28px; margin-bottom: 12px; }
.article .meta { color: var(--gray); font-size: 14px; padding-bottom: 20px; border-bottom: 1px solid var(--border); margin-bottom: 26px; }
.article .content p { margin-bottom: 14px; color: #334155; }
.side-list { background: #fff; border: 1px solid var(--border); border-radius: var(--radius); padding: 24px; }
.side-list h4 { font-size: 16px; margin-bottom: 14px; padding-bottom: 10px; border-bottom: 2px solid var(--primary-light); }
.side-list li { list-style: none; margin-bottom: 12px; font-size: 14px; }
.side-list li a { color: #334155; display: block; padding: 8px 12px; border-radius: 8px; transition: all .2s; }
.side-list li a:hover { background: var(--primary-light); color: var(--primary); }

/* ---------- 联系我们 ---------- */
.contact-grid { display: grid; grid-template-columns: 1fr 1.2fr; gap: 48px; align-items: start; }
.contact-info .info-item { display: flex; gap: 16px; margin-bottom: 24px; align-items: flex-start; }
.contact-info .info-icon { width: 44px; height: 44px; border-radius: 10px; background: var(--primary-light); color: var(--primary); display: flex; align-items: center; justify-content: center; font-size: 20px; flex-shrink: 0; }
.contact-info .info-item h4 { font-size: 16px; margin-bottom: 4px; }
.contact-info .info-item p { color: var(--gray); font-size: 14.5px; }
.contact-form { background: #fff; border: 1px solid var(--border); border-radius: var(--radius); padding: 36px; box-shadow: var(--shadow); }
.form-group { margin-bottom: 18px; }
.form-group label { display: block; font-size: 14px; font-weight: 600; margin-bottom: 6px; }
.form-group input, .form-group textarea, .form-group select { width: 100%; padding: 11px 14px; border: 1px solid var(--border); border-radius: 8px; font-size: 14.5px; font-family: inherit; transition: border .2s; }
.form-group input:focus, .form-group textarea:focus, .form-group select:focus { outline: none; border-color: var(--primary); box-shadow: 0 0 0 3px var(--focus-ring); }
.form-group textarea { min-height: 130px; resize: vertical; }
.form-row { display: grid; grid-template-columns: 1fr 1fr; gap: 16px; }
.form-tip { font-size: 13px; color: var(--gray); margin-top: 10px; }
.form-msg { padding: 12px 16px; border-radius: 8px; margin-bottom: 16px; font-size: 14px; display: none; }
.form-msg.ok { display: block; background: #ecfdf5; color: #047857; border: 1px solid #a7f3d0; }
.form-msg.err { display: block; background: #fef2f2; color: #b91c1c; border: 1px solid #fecaca; }

/* ---------- 下载中心 ---------- */
.alert-box { margin-bottom: 18px; }
.alert-success { padding: 12px 16px; border-radius: 8px; background: #ecfdf5; color: #047857; border: 1px solid #a7f3d0; margin-bottom: 8px; }
.alert-error { padding: 12px 16px; border-radius: 8px; background: #fef2f2; color: #b91c1c; border: 1px solid #fecaca; margin-bottom: 8px; }
.dl-version { font-size: 16px; color: #334155; margin-bottom: 10px; }
.dl-tip { color: var(--gray); margin-bottom: 18px; }
.dl-verify { margin-top: 8px; }
.dl-verify p { color: #334155; margin-bottom: 14px; }
.verify-form { display: flex; gap: 10px; justify-content: center; flex-wrap: wrap; }
.verify-form input { width: 260px; max-width: 100%; padding: 12px 14px; border: 1px solid var(--border); border-radius: 8px; font-size: 15px; }
.verify-form input:focus { outline: none; border-color: var(--primary); box-shadow: 0 0 0 3px var(--focus-ring); }
.dl-actions { margin-top: 8px; }
.dl-empty { color: var(--gray); }
.release-list { list-style: none; display: flex; flex-direction: column; gap: 14px; }
.release-list > li { border: 1px solid var(--border); border-radius: var(--radius); padding: 16px 20px; background: #fbfcfe; }
.release-head { display: flex; align-items: center; gap: 10px; flex-wrap: wrap; margin-bottom: 8px; }
.release-version { font-weight: 700; font-size: 16px; color: var(--dark); }
.release-current { background: #ecfdf5; color: #047857; padding: 2px 10px; border-radius: 12px; font-size: 12px; }
.release-meta { color: var(--gray); font-size: 13px; margin-left: auto; }
.release-note p { color: #475569; font-size: 14px; margin-bottom: 6px; line-height: 1.7; }
.release-dl { margin-top: 8px; }
.release-dl a { color: var(--primary); font-size: 14px; font-weight: 600; text-decoration: underline; }


/* ---------- 空状态 ---------- */
.empty { text-align: center; padding: 80px 20px; color: var(--gray); }
.empty .big { font-size: 60px; margin-bottom: 14px; opacity: 0.4; }

/* ---------- 响应式 ---------- */
@media (max-width: 900px) {
  .grid-3, .news-list { grid-template-columns: 1fr 1fr; }
  .about-block, .contact-grid { grid-template-columns: 1fr; }
  .stats-bar { grid-template-columns: 1fr 1fr; }
  .footer-grid { grid-template-columns: 1fr; gap: 28px; }
  .main-nav { display: none; position: absolute; top: 68px; left: 0; right: 0; background: #fff; flex-direction: column; padding: 16px; border-bottom: 1px solid var(--border); box-shadow: var(--shadow); }
  .main-nav.open { display: flex; }
  .nav-toggle { display: block; }
  .hero h1 { font-size: 34px; }
  .values-row { grid-template-columns: 1fr 1fr; }
}
@media (max-width: 600px) {
  .grid-3, .grid-2, .news-list, .form-row { grid-template-columns: 1fr; }
  .hero { padding: 80px 0; }
  .hero h1 { font-size: 28px; }
  .stats-bar { margin-top: -40px; }
  section { padding: 56px 0; }
  .feature-list { grid-template-columns: 1fr; }
  .article, .detail-card, .contact-form { padding: 24px; }
  .theme-dot { width: 20px; height: 20px; }
  .theme-switch { padding: 4px 6px; gap: 5px; margin-left: 4px; }
  .logo-text small { display: none; }
}