/* ============================================================
   长运娱乐平台 · AI 游戏科技企业官网
   主题：深空智核（深空蓝黑 + 电光青渐变 + 网格氛围）
   说明：单文件样式，无任何外部依赖；响应式三断点 1024 / 768 / 480
   ============================================================ */

/* ---------- 1. 设计变量 ---------- */
:root {
  --bg: #050a16;               /* 主背景：深空蓝黑 */
  --bg-soft: #0a1224;          /* 次级背景 */
  --panel: rgba(15, 26, 50, .62);
  --panel-solid: #0e1a33;
  --line: rgba(108, 166, 255, .16);
  --line-strong: rgba(108, 190, 255, .38);
  --text: #dde7f7;
  --text-dim: #8ea3c2;
  --accent: #35e0ff;           /* 电光青 */
  --accent-2: #4f7cff;         /* 星蓝 */
  --accent-3: #7b5cff;         /* 紫蓝渐变尾 */
  --grad: linear-gradient(135deg, #35e0ff 0%, #4f7cff 55%, #7b5cff 100%);
  --grad-soft: linear-gradient(135deg, rgba(53, 224, 255, .16), rgba(79, 124, 255, .16));
  --shadow: 0 18px 50px rgba(2, 8, 24, .55);
  --radius: 14px;
  --font-sans: "PingFang SC", "HarmonyOS Sans SC", "Microsoft YaHei", "Source Han Sans SC", "Noto Sans SC", sans-serif;
  --font-mono: "Cascadia Mono", "SF Mono", Consolas, "Courier New", monospace;
  --header-h: 72px;
}

/* ---------- 2. Reset 与基础 ---------- */
*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }
html { scroll-behavior: smooth; -webkit-text-size-adjust: 100%; overflow-x: hidden; }
body {
  font-family: var(--font-sans);
  color: var(--text);
  background-color: var(--bg);
  line-height: 1.75;
  font-size: 16px;
  overflow-x: hidden;
  /* 氛围：顶部青蓝光晕 + 固定网格 */
  background-image:
    radial-gradient(900px 480px at 82% -10%, rgba(53, 224, 255, .13), transparent 62%),
    radial-gradient(760px 420px at -8% 8%, rgba(79, 124, 255, .12), transparent 60%),
    linear-gradient(rgba(108, 166, 255, .05) 1px, transparent 1px),
    linear-gradient(90deg, rgba(108, 166, 255, .05) 1px, transparent 1px);
  background-size: auto, auto, 44px 44px, 44px 44px;
  background-attachment: fixed;
}
img { max-width: 100%; display: block; }
a { color: var(--accent); text-decoration: none; transition: color .25s, opacity .25s; }
a:hover { color: #7deeff; }
ul, ol { list-style: none; }
strong { color: #fff; }
::selection { background: rgba(53, 224, 255, .32); color: #fff; }

h1, h2, h3, h4 { line-height: 1.3; font-weight: 700; letter-spacing: .02em; }
h1 { font-size: clamp(1.9rem, 4.6vw, 3.1rem); }
h2 { font-size: clamp(1.5rem, 3vw, 2.1rem); }
h3 { font-size: 1.13rem; }

/* ---------- 3. 布局与通用组件 ---------- */
.container { width: min(1180px, 92%); margin-inline: auto; }
.section { padding: clamp(64px, 9vw, 110px) 0; position: relative; }
.section--soft {
  background: linear-gradient(180deg, rgba(10, 18, 36, 0) 0%, rgba(10, 18, 36, .85) 18%, rgba(10, 18, 36, .85) 82%, rgba(10, 18, 36, 0) 100%);
  border-top: 1px solid var(--line);
  border-bottom: 1px solid var(--line);
}

/* 区块标题：编号 + 标题 + 描述（非对称编辑风） */
.section-head { max-width: 720px; margin-bottom: clamp(34px, 5vw, 56px); position: relative; }
.section-head .index {
  font-family: var(--font-mono); font-size: .82rem; letter-spacing: .35em;
  color: var(--accent); display: inline-flex; align-items: center; gap: 12px;
}
.section-head .index::after { content: ""; width: 64px; height: 1px; background: var(--grad); }
.section-head h2 { margin: 12px 0 14px; }
.section-head h2 em {
  font-style: normal;
  background: var(--grad);
  -webkit-background-clip: text; background-clip: text;
  -webkit-text-fill-color: transparent; color: transparent;
}
.section-head p { color: var(--text-dim); }
.section-head--center { margin-inline: auto; text-align: center; }
.section-head--center .index::after { display: none; }

/* 按钮 */
.btn {
  display: inline-flex; align-items: center; justify-content: center; gap: 8px;
  padding: 13px 30px; border-radius: 999px; border: 1px solid transparent;
  font-size: .95rem; font-weight: 600; letter-spacing: .06em; cursor: pointer;
  position: relative; overflow: hidden; transition: transform .25s, box-shadow .25s, border-color .25s, background .25s;
  font-family: var(--font-sans);
}
.btn-primary { background: var(--grad); color: #04121f; box-shadow: 0 10px 30px rgba(53, 170, 255, .28); }
.btn-primary::after {
  content: ""; position: absolute; inset: 0; transform: translateX(-120%);
  background: linear-gradient(100deg, transparent 30%, rgba(255, 255, 255, .5) 50%, transparent 70%);
  transition: transform .6s ease;
}
.btn-primary:hover { transform: translateY(-2px); box-shadow: 0 16px 38px rgba(53, 170, 255, .4); color: #04121f; }
.btn-primary:hover::after { transform: translateX(120%); }
.btn-ghost { border-color: var(--line-strong); color: var(--text); background: rgba(53, 224, 255, .04); }
.btn-ghost:hover { border-color: var(--accent); color: var(--accent); transform: translateY(-2px); }
.btn-sm { padding: 9px 20px; font-size: .86rem; }
.btn-arrow { font-family: var(--font-mono); }

/* 徽标 chip */
.chip {
  display: inline-flex; align-items: center; gap: 8px;
  font-family: var(--font-mono); font-size: .76rem; letter-spacing: .22em;
  color: var(--accent); border: 1px solid var(--line-strong);
  padding: 6px 14px; border-radius: 999px; background: rgba(53, 224, 255, .06);
  text-transform: uppercase;
}

/* 占位视觉块（以 CSS 渐变替代图片，避免外部依赖） */
.ph {
  position: relative; overflow: hidden; border-radius: var(--radius);
  background: var(--grad-soft), radial-gradient(120% 90% at 80% 0%, rgba(53, 224, 255, .2), transparent 55%);
  border: 1px solid var(--line); min-height: 180px;
}
.ph::before {
  content: ""; position: absolute; inset: 0;
  background:
    radial-gradient(2px 2px at 18% 30%, rgba(53, 224, 255, .9), transparent 100%),
    radial-gradient(2px 2px at 68% 18%, rgba(255, 255, 255, .8), transparent 100%),
    radial-gradient(2px 2px at 82% 62%, rgba(53, 224, 255, .7), transparent 100%),
    radial-gradient(2px 2px at 38% 76%, rgba(255, 255, 255, .6), transparent 100%),
    linear-gradient(rgba(108, 166, 255, .1) 1px, transparent 1px),
    linear-gradient(90deg, rgba(108, 166, 255, .1) 1px, transparent 1px);
  background-size: auto, auto, auto, auto, 28px 28px, 28px 28px;
  animation: phDrift 16s linear infinite;
}
.ph .ph-core {
  position: absolute; top: 50%; left: 50%; transform: translate(-50%, -50%);
  font-family: var(--font-mono); font-size: .78rem; letter-spacing: .3em;
  color: var(--accent); border: 1px solid var(--line-strong); border-radius: 999px;
  padding: 8px 18px; background: rgba(5, 10, 22, .55); white-space: nowrap;
}
@keyframes phDrift { to { transform: translateY(28px); } }

/* ---------- 4. 顶部导航 ---------- */
.site-header {
  position: sticky; top: 0; z-index: 60; height: var(--header-h);
  background: rgba(5, 10, 22, .78);
  -webkit-backdrop-filter: blur(14px); backdrop-filter: blur(14px);
  border-bottom: 1px solid var(--line);
}
.header-inner { height: var(--header-h); display: flex; align-items: center; justify-content: space-between; gap: 24px; }
.brand { display: flex; align-items: center; gap: 12px; }
.brand img { width: 40px; height: 40px; }
.brand-text { display: flex; flex-direction: column; line-height: 1.25; }
.brand-text strong { font-size: 1.06rem; letter-spacing: .1em; color: #fff; }
.brand-text em { font-style: normal; font-family: var(--font-mono); font-size: .64rem; letter-spacing: .34em; color: var(--accent); }

.site-nav { display: flex; align-items: center; gap: 28px; }
.site-nav ul { display: flex; gap: 6px; }
.site-nav a.nav-link {
  display: block; padding: 8px 14px; color: var(--text-dim);
  font-size: .95rem; letter-spacing: .08em; border-radius: 8px; position: relative;
}
.site-nav a.nav-link::after {
  content: ""; position: absolute; left: 14px; right: 14px; bottom: 2px; height: 2px;
  background: var(--grad); border-radius: 2px; transform: scaleX(0); transform-origin: left; transition: transform .3s;
}
.site-nav a.nav-link:hover { color: #fff; }
.site-nav a.nav-link:hover::after { transform: scaleX(.6); }
.site-nav a.nav-link.active { color: #fff; }
.site-nav a.nav-link.active::after { transform: scaleX(1); }

/* 汉堡按钮（移动端显示） */
.nav-toggle {
  display: none; width: 44px; height: 44px; border: 1px solid var(--line-strong);
  background: rgba(53, 224, 255, .05); border-radius: 10px; cursor: pointer;
  flex-direction: column; align-items: center; justify-content: center; gap: 5px;
}
.nav-toggle span { width: 20px; height: 2px; background: var(--accent); border-radius: 2px; transition: transform .3s, opacity .3s; }
.nav-toggle.is-open span:nth-child(1) { transform: translateY(7px) rotate(45deg); }
.nav-toggle.is-open span:nth-child(2) { opacity: 0; }
.nav-toggle.is-open span:nth-child(3) { transform: translateY(-7px) rotate(-45deg); }

/* ---------- 5. 面包屑 ---------- */
.breadcrumb { padding: 18px 0 0; font-size: .86rem; color: var(--text-dim); }
.breadcrumb ol { display: flex; flex-wrap: wrap; gap: 6px; align-items: center; font-family: var(--font-mono); letter-spacing: .05em; }
.breadcrumb li { display: flex; align-items: center; gap: 6px; }
.breadcrumb li + li::before { content: "/"; color: var(--line-strong); }
.breadcrumb a { color: var(--text-dim); }
.breadcrumb a:hover { color: var(--accent); }
.breadcrumb [aria-current="page"] { color: var(--accent); }

/* ---------- 6. Hero / 轮播 ---------- */
.hero { position: relative; overflow: hidden; min-height: min(88vh, 760px); display: flex; align-items: center; padding: calc(var(--header-h) + 30px) 0 90px; }
.hero-slides { position: absolute; inset: 0; z-index: -1; }
.hero-slide { position: absolute; inset: 0; opacity: 0; transition: opacity 1.1s ease; }
.hero-slide.active { opacity: 1; }
.hero-slide:nth-child(1) { background: radial-gradient(1000px 560px at 78% 18%, rgba(53, 224, 255, .22), transparent 60%), radial-gradient(760px 520px at 8% 88%, rgba(79, 124, 255, .22), transparent 62%), linear-gradient(160deg, #071024 0%, #050a16 70%); }
.hero-slide:nth-child(2) { background: radial-gradient(900px 540px at 18% 12%, rgba(123, 92, 255, .2), transparent 58%), radial-gradient(820px 480px at 88% 82%, rgba(53, 224, 255, .18), transparent 60%), linear-gradient(200deg, #081026 0%, #050a16 72%); }
.hero-slide:nth-child(3) { background: radial-gradient(920px 540px at 62% 88%, rgba(79, 124, 255, .24), transparent 60%), radial-gradient(700px 420px at 92% 6%, rgba(53, 224, 255, .2), transparent 58%), linear-gradient(120deg, #060c1c 0%, #050a16 74%); }
.hero-slides::after {
  content: ""; position: absolute; inset: 0; pointer-events: none;
  background:
    linear-gradient(rgba(108, 166, 255, .07) 1px, transparent 1px),
    linear-gradient(90deg, rgba(108, 166, 255, .07) 1px, transparent 1px);
  background-size: 52px 52px;
  -webkit-mask-image: radial-gradient(80% 70% at 50% 40%, #000 30%, transparent 100%);
  mask-image: radial-gradient(80% 70% at 50% 40%, #000 30%, transparent 100%);
}
.hero-inner { max-width: 860px; }
.hero .chip { margin-bottom: 22px; animation: fadeUp .8s .05s both; }
.hero h1 { margin-bottom: 8px; animation: fadeUp .8s .15s both; }
.hero h1 em {
  font-style: normal; background: var(--grad);
  -webkit-background-clip: text; background-clip: text;
  -webkit-text-fill-color: transparent; color: transparent;
}
.hero-sub { font-size: clamp(1rem, 1.6vw, 1.16rem); color: var(--text-dim); max-width: 640px; margin: 18px 0 34px; animation: fadeUp .8s .3s both; }
.hero-actions { display: flex; flex-wrap: wrap; gap: 16px; animation: fadeUp .8s .42s both; }
.hero-meta {
  margin-top: 54px; padding-top: 22px; border-top: 1px solid var(--line);
  display: flex; flex-wrap: wrap; gap: 12px 40px;
  font-family: var(--font-mono); font-size: .78rem; letter-spacing: .2em; color: var(--text-dim);
  animation: fadeUp .8s .55s both;
}
.hero-meta b { color: var(--accent); font-weight: 600; }
/* 轮播圆点 */
.hero-dots { position: absolute; left: 50%; transform: translateX(-50%); bottom: 28px; display: flex; gap: 12px; }
.hero-dots button {
  width: 34px; height: 4px; border: none; border-radius: 4px; cursor: pointer;
  background: rgba(108, 166, 255, .28); transition: background .3s;
}
.hero-dots button.active { background: var(--grad); }

/* 内页统一页头 */
.page-hero { padding: calc(var(--header-h) + 26px) 0 34px; position: relative; overflow: hidden; }
.page-hero::before {
  content: ""; position: absolute; right: -120px; top: -160px; width: 420px; height: 420px;
  background: radial-gradient(circle, rgba(53, 224, 255, .14), transparent 65%);
  pointer-events: none;
}
.page-hero h1 { font-size: clamp(1.7rem, 3.6vw, 2.5rem); margin: 14px 0 12px; }
.page-hero .lede { color: var(--text-dim); max-width: 760px; }

/* ---------- 7. 数据条（计数动画） ---------- */
.stats-grid { display: grid; grid-template-columns: repeat(4, 1fr); gap: 18px; }
.stat {
  border: 1px solid var(--line); border-radius: var(--radius);
  background: var(--panel); padding: 26px 22px; position: relative; overflow: hidden;
}
.stat::before { content: ""; position: absolute; top: 0; left: 0; right: 0; height: 2px; background: var(--grad); opacity: .7; }
.stat .num { font-family: var(--font-mono); font-size: clamp(1.7rem, 3vw, 2.3rem); color: #fff; display: flex; align-items: baseline; gap: 2px; }
.stat .num i { font-style: normal; color: var(--accent); font-size: .6em; }
.stat .label { color: var(--text-dim); font-size: .88rem; margin-top: 6px; letter-spacing: .1em; }

/* ---------- 8. 卡片：核心业务 / 产品 ---------- */
.grid-4 { display: grid; grid-template-columns: repeat(4, 1fr); gap: 18px; }
.grid-3 { display: grid; grid-template-columns: repeat(3, 1fr); gap: 20px; }
.grid-2 { display: grid; grid-template-columns: repeat(2, 1fr); gap: 20px; }

.card {
  border: 1px solid var(--line); border-radius: var(--radius);
  background: var(--panel); padding: 28px 24px; position: relative;
  transition: transform .3s, border-color .3s, box-shadow .3s;
}
.card:hover { transform: translateY(-6px); border-color: var(--line-strong); box-shadow: var(--shadow); }
.card .no { font-family: var(--font-mono); font-size: .74rem; letter-spacing: .3em; color: var(--accent); opacity: .85; }
.card h3 { margin: 12px 0 10px; }
.card p { color: var(--text-dim); font-size: .93rem; }
.card .more { display: inline-flex; align-items: center; gap: 6px; margin-top: 16px; font-size: .88rem; letter-spacing: .05em; }

/* 产品卡 */
.product-card { padding: 0; overflow: hidden; display: flex; flex-direction: column; }
.product-card .ph { min-height: 190px; border: none; border-bottom: 1px solid var(--line); border-radius: 0; }
.product-card .body { padding: 24px; display: flex; flex-direction: column; gap: 10px; flex: 1; }
.product-card .tag-row { display: flex; flex-wrap: wrap; gap: 8px; }
.tag {
  font-family: var(--font-mono); font-size: .7rem; letter-spacing: .16em;
  color: var(--text-dim); border: 1px solid var(--line); border-radius: 999px; padding: 3px 10px;
}
.tag--hot { color: var(--accent); border-color: var(--line-strong); background: rgba(53, 224, 255, .08); }
.product-card .body p { flex: 1; }
/* 卡片视觉差异化：不同色相的占位封面 */
.hue-a { background: linear-gradient(150deg, rgba(53, 224, 255, .22), rgba(79, 124, 255, .1)), radial-gradient(120% 100% at 80% 0%, rgba(53, 224, 255, .35), transparent 60%); }
.hue-b { background: linear-gradient(150deg, rgba(123, 92, 255, .24), rgba(53, 224, 255, .08)), radial-gradient(120% 100% at 20% 0%, rgba(123, 92, 255, .32), transparent 60%); }
.hue-c { background: linear-gradient(150deg, rgba(79, 124, 255, .26), rgba(123, 92, 255, .1)), radial-gradient(120% 100% at 80% 100%, rgba(79, 124, 255, .34), transparent 60%); }

/* ---------- 9. 选项卡 ---------- */
.tabs { display: flex; flex-wrap: wrap; gap: 10px; margin-bottom: 30px; }
.tabs button {
  font-family: var(--font-sans); font-size: .92rem; letter-spacing: .1em; cursor: pointer;
  padding: 9px 22px; border-radius: 999px; border: 1px solid var(--line);
  background: transparent; color: var(--text-dim); transition: all .25s;
}
.tabs button:hover { color: #fff; border-color: var(--line-strong); }
.tabs button.active {
  color: #04121f; background: var(--grad); border-color: transparent; font-weight: 600;
  box-shadow: 0 8px 22px rgba(53, 170, 255, .3);
}
.tab-panel[hidden] { display: none; }

/* ---------- 10. 新闻列表 ---------- */
.news-item {
  display: grid; grid-template-columns: 120px 1fr auto; gap: 24px; align-items: center;
  border: 1px solid var(--line); border-radius: var(--radius); background: var(--panel);
  padding: 24px 28px; margin-bottom: 18px; transition: transform .3s, border-color .3s;
}
.news-item:hover { transform: translateX(6px); border-color: var(--line-strong); }
.news-date { font-family: var(--font-mono); color: var(--accent); font-size: .84rem; line-height: 1.5; letter-spacing: .08em; }
.news-date b { display: block; font-size: 1.5rem; color: #fff; }
.news-item h3 { margin-bottom: 8px; font-size: 1.08rem; }
.news-item h3 a { color: #fff; }
.news-item h3 a:hover { color: var(--accent); }
.news-item p { color: var(--text-dim); font-size: .92rem; }
.news-item .go { font-family: var(--font-mono); color: var(--accent); white-space: nowrap; }

/* ---------- 11. 图文分栏（关于我们简介等） ---------- */
.split { display: grid; grid-template-columns: 1.05fr .95fr; gap: clamp(30px, 5vw, 64px); align-items: center; }
.split .media { min-height: 340px; }
.split h2 { margin: 12px 0 16px; }
.split p { color: var(--text-dim); margin-bottom: 14px; }
.split .link-arrow { display: inline-flex; align-items: center; gap: 8px; margin-top: 8px; letter-spacing: .06em; }
.ticks { margin-top: 18px; display: grid; gap: 10px; }
.ticks li { display: flex; gap: 10px; align-items: flex-start; color: var(--text-dim); font-size: .94rem; }
.ticks li::before { content: "◆"; color: var(--accent); font-size: .7em; line-height: 2.4; }

/* ---------- 12. 时间线（发展历程） ---------- */
.timeline { position: relative; padding-left: 34px; display: grid; gap: 30px; }
.timeline::before { content: ""; position: absolute; left: 8px; top: 6px; bottom: 6px; width: 1px; background: linear-gradient(180deg, var(--accent), rgba(79, 124, 255, .1)); }
.timeline li { position: relative; }
.timeline li::before {
  content: ""; position: absolute; left: -31px; top: 8px; width: 11px; height: 11px;
  border-radius: 50%; background: var(--bg); border: 2px solid var(--accent); box-shadow: 0 0 12px rgba(53, 224, 255, .7);
}
.timeline time { font-family: var(--font-mono); color: var(--accent); letter-spacing: .2em; font-size: .86rem; }
.timeline h3 { margin: 6px 0; }
.timeline p { color: var(--text-dim); font-size: .94rem; max-width: 640px; }

/* ---------- 13. 价值观 ---------- */
.value-card .glyph {
  width: 46px; height: 46px; border-radius: 12px; display: grid; place-items: center;
  background: var(--grad-soft); border: 1px solid var(--line-strong);
  font-family: var(--font-mono); color: var(--accent); margin-bottom: 14px;
}

/* ---------- 14. 联系我们 ---------- */
.contact-grid { display: grid; grid-template-columns: 1.15fr .85fr; gap: 26px; align-items: start; }
.form-card, .info-card {
  border: 1px solid var(--line); border-radius: var(--radius);
  background: var(--panel); padding: clamp(24px, 3vw, 36px);
}
.form-row { display: grid; grid-template-columns: 1fr 1fr; gap: 16px; }
.field { display: flex; flex-direction: column; gap: 8px; margin-bottom: 16px; }
.field label { font-size: .9rem; color: var(--text); letter-spacing: .06em; }
.field label b { color: var(--accent); }
.field input, .field select, .field textarea {
  width: 100%; padding: 12px 14px; border-radius: 10px; color: var(--text);
  background: rgba(5, 10, 22, .6); border: 1px solid var(--line);
  font-family: var(--font-sans); font-size: .95rem; transition: border-color .25s, box-shadow .25s;
}
.field textarea { min-height: 130px; resize: vertical; }
.field input:focus, .field select:focus, .field textarea:focus {
  outline: none; border-color: var(--accent); box-shadow: 0 0 0 3px rgba(53, 224, 255, .16);
}
.field ::placeholder { color: rgba(142, 163, 194, .55); }
.form-note { font-size: .8rem; color: var(--text-dim); margin-top: 12px; }
.form-alert {
  display: none; margin-top: 14px; padding: 12px 16px; border-radius: 10px; font-size: .9rem;
  border: 1px solid rgba(53, 224, 255, .5); background: rgba(53, 224, 255, .1); color: #aef2ff;
}
.form-alert.show { display: block; animation: fadeUp .4s both; }
.info-list { display: grid; gap: 18px; }
.info-list .item { display: flex; gap: 14px; align-items: flex-start; }
.info-list .item .glyph {
  flex: none; width: 40px; height: 40px; border-radius: 10px; display: grid; place-items: center;
  border: 1px solid var(--line-strong); background: var(--grad-soft);
  font-family: var(--font-mono); font-size: .8rem; color: var(--accent);
}
.info-list h3 { font-size: .98rem; margin-bottom: 2px; }
.info-list p { color: var(--text-dim); font-size: .92rem; }
.info-list a { color: var(--text); }
.info-list a:hover { color: var(--accent); }

/* ---------- 15. CTA 行动条 ---------- */
.cta-band {
  position: relative; overflow: hidden; border: 1px solid var(--line-strong); border-radius: calc(var(--radius) + 6px);
  background: var(--grad-soft), radial-gradient(120% 140% at 85% 10%, rgba(53, 224, 255, .22), transparent 55%);
  padding: clamp(36px, 5vw, 60px); text-align: center;
}
.cta-band::before {
  content: ""; position: absolute; inset: 0; pointer-events: none;
  background: linear-gradient(rgba(108, 166, 255, .08) 1px, transparent 1px), linear-gradient(90deg, rgba(108, 166, 255, .08) 1px, transparent 1px);
  background-size: 36px 36px;
  -webkit-mask-image: radial-gradient(70% 90% at 50% 50%, #000, transparent);
  mask-image: radial-gradient(70% 90% at 50% 50%, #000, transparent);
}
.cta-band h2 { margin-bottom: 12px; position: relative; }
.cta-band p { color: var(--text-dim); margin-bottom: 26px; position: relative; }
.cta-band .btn { position: relative; }

/* ---------- 16. 页脚 ---------- */
.site-footer { border-top: 1px solid var(--line); background: linear-gradient(180deg, rgba(8, 14, 30, .4), rgba(4, 8, 18, .9)); margin-top: 40px; }
.footer-grid { display: grid; grid-template-columns: 1.4fr 1fr 1fr 1.2fr; gap: 34px; padding: 56px 0 40px; }
.footer-brand p { color: var(--text-dim); font-size: .9rem; margin: 14px 0 16px; max-width: 320px; }
.footer-col h3 { font-size: .95rem; letter-spacing: .14em; margin-bottom: 16px; color: #fff; }
.footer-col h3::after { content: ""; display: block; width: 28px; height: 2px; background: var(--grad); margin-top: 8px; border-radius: 2px; }
.footer-col ul { display: grid; gap: 10px; }
.footer-col a { color: var(--text-dim); font-size: .92rem; }
.footer-col a:hover { color: var(--accent); }
.footer-col .meta { color: var(--text-dim); font-size: .92rem; display: grid; gap: 10px; }
.footer-col .meta b { color: var(--text); font-weight: 600; }
.footer-bottom { border-top: 1px solid var(--line); padding: 20px 0 26px; }
.footer-bottom .inner { display: flex; flex-wrap: wrap; justify-content: space-between; gap: 10px; color: var(--text-dim); font-size: .84rem; }
.footer-bottom a { color: var(--text-dim); }
.footer-bottom a:hover { color: var(--accent); }

/* ---------- 17. 返回顶部 ---------- */
.back-top {
  position: fixed; right: 26px; bottom: 30px; z-index: 70;
  width: 48px; height: 48px; border-radius: 50%; cursor: pointer;
  border: 1px solid var(--line-strong); color: var(--accent);
  background: rgba(5, 10, 22, .82); font-family: var(--font-mono); font-size: 1rem;
  opacity: 0; visibility: hidden; transform: translateY(14px);
  transition: opacity .3s, transform .3s, visibility .3s, box-shadow .3s;
}
.back-top.show { opacity: 1; visibility: visible; transform: translateY(0); }
.back-top:hover { box-shadow: 0 0 0 4px rgba(53, 224, 255, .16); color: #fff; border-color: var(--accent); }

/* ---------- 18. 滚动显现动画 ---------- */
.js .reveal { opacity: 0; transform: translateY(26px); transition: opacity .7s ease, transform .7s ease; }
.js .reveal.in { opacity: 1; transform: none; }
.js .reveal[data-delay="1"] { transition-delay: .1s; }
.js .reveal[data-delay="2"] { transition-delay: .2s; }
.js .reveal[data-delay="3"] { transition-delay: .3s; }
@keyframes fadeUp { from { opacity: 0; transform: translateY(22px); } to { opacity: 1; transform: none; } }

/* ---------- 19. 404 页 ---------- */
.error-page { min-height: 72vh; display: grid; place-items: center; text-align: center; padding: 120px 0 80px; }
.error-code {
  font-family: var(--font-mono); font-size: clamp(5rem, 16vw, 9rem); line-height: 1;
  background: var(--grad); -webkit-background-clip: text; background-clip: text;
  -webkit-text-fill-color: transparent; color: transparent; letter-spacing: .1em;
}
.error-page h1 { font-size: 1.4rem; margin: 18px 0 10px; }
.error-page p { color: var(--text-dim); margin-bottom: 28px; }

/* ---------- 20. 响应式：平板 ≤1024 ---------- */
@media (max-width: 1024px) {
  .grid-4 { grid-template-columns: repeat(2, 1fr); }
  .grid-3 { grid-template-columns: repeat(2, 1fr); }
  .stats-grid { grid-template-columns: repeat(2, 1fr); }
  .footer-grid { grid-template-columns: 1fr 1fr; }
  .split { grid-template-columns: 1fr; }
  .split .media { min-height: 260px; }
  .contact-grid { grid-template-columns: 1fr; }
  .site-nav { gap: 16px; }
}

/* ---------- 21. 响应式：手机 ≤768（汉堡菜单） ---------- */
@media (max-width: 768px) {
  .nav-toggle { display: flex; }
  .site-nav {
    position: fixed; top: var(--header-h); right: 0; bottom: 0; z-index: 55;
    width: min(78vw, 320px); flex-direction: column; align-items: flex-start;
    padding: 28px 26px; gap: 22px;
    background: rgba(6, 11, 25, .97); border-left: 1px solid var(--line);
    transform: translateX(100%); transition: transform .35s ease;
    -webkit-backdrop-filter: blur(16px); backdrop-filter: blur(16px);
    overflow-y: auto;
  }
  .site-nav.open { transform: translateX(0); box-shadow: -30px 0 60px rgba(2, 8, 24, .6); }
  .site-nav ul { flex-direction: column; width: 100%; gap: 4px; }
  .site-nav ul a.nav-link { padding: 12px 10px; font-size: 1.02rem; border-bottom: 1px solid var(--line); border-radius: 0; width: 100%; }
  .site-nav ul a.nav-link::after { left: 10px; }
  .grid-3, .grid-2, .grid-4 { grid-template-columns: 1fr; }
  .news-item { grid-template-columns: 1fr; gap: 10px; padding: 22px; }
  .news-item .go { display: none; }
  .form-row { grid-template-columns: 1fr; }
  .footer-grid { grid-template-columns: 1fr; gap: 28px; padding: 44px 0 30px; }
  .hero { min-height: auto; padding-bottom: 76px; }
  .hero-meta { gap: 10px 26px; }
  .back-top { right: 16px; bottom: 20px; }
}

/* ---------- 22. 响应式：小屏 ≤480 ---------- */
@media (max-width: 480px) {
  body { font-size: 15px; }
  .stats-grid { grid-template-columns: 1fr 1fr; gap: 12px; }
  .stat { padding: 20px 16px; }
  .btn { width: 100%; }
  .hero-actions { flex-direction: column; }
  .breadcrumb { font-size: .8rem; }
  .brand-text strong { font-size: .98rem; }
  .brand-text em { letter-spacing: .22em; }
}

/* ---------- 23. 动效偏好降级 ---------- */
@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
  *, *::before, *::after { animation-duration: .01ms !important; animation-iteration-count: 1 !important; transition-duration: .01ms !important; }
  .js .reveal { opacity: 1; transform: none; }
}

/* ---------- 24. 打印友好 ---------- */
@media print {
  .site-header, .site-footer, .back-top, .hero-dots, .nav-toggle { display: none !important; }
  body { background: #fff; color: #111; }
}

/* ============================================================
   25. 自适应配图（真实 img 集成）—— 新增区块
   说明：Hero 主视觉大图 / 产品卡配图 / 关于页配图 / 新闻缩略图；
        全部图片保留原有 CSS 渐变作为加载失败时的兜底层
   ============================================================ */

/* 25.1 首页 Hero 主视觉图片层：置于渐变轮播之上、文案之下 */
.hero-media { position: absolute; inset: 0; z-index: -1; }
.hero-media img {
  width: 100%; height: 100%; object-fit: cover; object-position: center;
}
/* 图片上的暗色渐变遮罩：保证左侧文案可读，底部融入页面主背景 */
.hero-media::after {
  content: ""; position: absolute; inset: 0; pointer-events: none;
  background:
    linear-gradient(96deg, rgba(5, 10, 22, .9) 4%, rgba(5, 10, 22, .62) 42%, rgba(5, 10, 22, .18) 78%, rgba(5, 10, 22, .05) 100%),
    linear-gradient(180deg, rgba(5, 10, 22, .14) 0%, rgba(5, 10, 22, 0) 26%, rgba(5, 10, 22, 0) 62%, var(--bg) 100%);
}
/* 图片加载失败：整层隐藏，露出原 CSS 渐变轮播兜底 */
.hero-media.is-fallback { display: none; }

/* 25.2 产品卡真实配图：img 在文档流内铺满卡片头，锁定比例不变形不溢出 */
.ph.ph--img { overflow: hidden; }
.ph.ph--img::before { display: none; }  /* 关闭占位层的星点/网格动画 */
.ph.ph--img img {
  width: 100%; height: auto; display: block;
  aspect-ratio: 1536 / 1024;             /* 与源图 3:2 一致，配合 width/height 属性防布局跳动 */
  object-fit: cover;
}

/* 25.3 关于我们页配图：绝对定位铺满媒体容器，随 .split .media 的 min-height 自适应 */
.ph.media--img { overflow: hidden; }
.ph.media--img::before { display: none; }
.ph.media--img img {
  position: absolute; inset: 0; width: 100%; height: 100%;
  object-fit: cover;
}

/* 25.4 新闻列表缩略图：桌面端左侧独立列，移动端转为整行封面 */
.news-item.has-thumb { grid-template-columns: 140px 120px 1fr auto; }
.news-thumb {
  display: block; width: 140px; height: 86px; object-fit: cover;
  border: 1px solid var(--line); border-radius: 10px;
}
@media (max-width: 768px) {
  .news-item.has-thumb { grid-template-columns: 1fr; }
  .news-thumb { width: 100%; height: 150px; }
}