/* ============================================================
   都行科技官网 V2 · 设计令牌与基础层
   定位：简约、科技、大方 —— 深空底 + 电光青强调 + 大留白
   约束：零依赖、零构建、零境外资源（系统字体栈 + 内联 SVG）
   ============================================================ */

:root{
  /* 深色区 */
  --ink:        #0A0D14;
  --ink-2:      #101725;
  --ink-line:   rgba(255,255,255,.09);
  --inv:        #EEF2F8;
  --inv-2:      #94A2B8;
  --inv-3:      #5C6880;

  /* 浅色区 */
  --paper:      #FFFFFF;
  --paper-2:    #F5F7FA;
  --paper-3:    #EDF1F6;
  --line:       #E4E8EE;
  --txt:        #0E131B;
  --txt-2:      #59636F;
  --txt-3:      #8A93A0;

  /* 品牌 */
  --brand:      #2BD8FF;
  --brand-2:    #4B6BFB;
  --brand-grad: linear-gradient(115deg, #2BD8FF 0%, #4B6BFB 100%);
  --brand-soft: rgba(43,216,255,.12);

  /* 尺度 */
  --wrap:       1120px;
  --gut:        24px;
  --sec:        104px;
  --r-sm:       8px;
  --r-md:       14px;
  --r-lg:       20px;

  --ease:       cubic-bezier(.22,1,.36,1);
}

*,*::before,*::after{ margin:0; padding:0; box-sizing:border-box; }

html{ font-size:16px; -webkit-text-size-adjust:100%; scroll-behavior:smooth; }

body{
  font-family:-apple-system, BlinkMacSystemFont, "Segoe UI", "PingFang SC",
              "Hiragino Sans GB", "Microsoft YaHei", "Noto Sans CJK SC",
              "Source Han Sans SC", sans-serif;
  color:var(--txt);
  background:var(--paper);
  line-height:1.7;
  -webkit-font-smoothing:antialiased;
}

img{ max-width:100%; height:auto; display:block; }
a{ color:inherit; text-decoration:none; }

.wrap{ width:100%; max-width:var(--wrap); margin:0 auto; padding:0 var(--gut); }

/* ---------- 顶部导航：常驻深色玻璃，浮在两种底色上都成立 ---------- */
.site-header{
  position:sticky; top:0; z-index:50;
  background:rgba(10,13,20,.72);
  border-bottom:1px solid var(--ink-line);
  backdrop-filter:saturate(160%) blur(14px);
  -webkit-backdrop-filter:saturate(160%) blur(14px);
}
.site-header .wrap{
  display:flex; align-items:center; justify-content:space-between;
  min-height:68px; gap:20px;
}
.brand{ display:flex; align-items:center; gap:11px; }
.brand-mark{ width:26px; height:26px; flex:none; }
.brand-name{ color:var(--inv); font-size:1.06rem; font-weight:600; letter-spacing:.02em; }
.brand-en{
  color:var(--inv-3); font-size:.7rem; font-weight:500;
  letter-spacing:.22em; padding-left:2px; padding-top:2px;
}
.site-nav{ display:flex; align-items:center; gap:4px; }
.site-nav a{
  color:var(--inv-2); font-size:.92rem;
  padding:8px 13px; border-radius:var(--r-sm);
  transition:color .2s var(--ease), background .2s var(--ease);
}
.site-nav a:hover{ color:var(--inv); background:rgba(255,255,255,.06); }
.site-nav a[aria-current="page"]{ color:var(--brand); }

/* ---------- Hero：细网格 + 双光晕 + 巨字水印 ---------- */
.hero{
  position:relative; overflow:hidden;
  background:var(--ink);
  border-bottom:1px solid var(--ink-line);
}
.hero-content{ position:relative; z-index:2; padding:132px 0 108px; }
.hero::before{                       /* 细网格 */
  content:""; position:absolute; inset:0;
  background-image:
    linear-gradient(to right, rgba(255,255,255,.055) 1px, transparent 1px),
    linear-gradient(to bottom, rgba(255,255,255,.055) 1px, transparent 1px);
  background-size:64px 64px;
  mask-image:radial-gradient(120% 90% at 50% 0%, #000 25%, transparent 78%);
  -webkit-mask-image:radial-gradient(120% 90% at 50% 0%, #000 25%, transparent 78%);
}
.hero::after{                        /* 双光晕 */
  content:""; position:absolute; inset:-30% -10% auto -10%; height:130%;
  background:
    radial-gradient(38% 44% at 22% 30%, rgba(43,216,255,.22) 0%, transparent 70%),
    radial-gradient(34% 42% at 78% 18%, rgba(75,107,251,.26) 0%, transparent 72%);
  filter:blur(30px);
  pointer-events:none;
}
.hero .wrap{ position:relative; z-index:3; }

.hero-watermark{
  position:absolute; right:-1%; bottom:9%;
  font-size:clamp(8rem,22vw,17rem); font-weight:600; line-height:.78;
  letter-spacing:-.045em; color:transparent;
  -webkit-text-stroke:1.4px rgba(120,190,255,.12);
  pointer-events:none; user-select:none; z-index:1;
}

/* Hero 底部数据带：深色区里的仪表盘式一行 */
.hero-data{
  position:relative; z-index:2;
  border-top:1px solid var(--ink-line);
}
.hero-data::before{
  content:""; position:absolute; top:-1px; left:50%; transform:translateX(-50%);
  width:min(100%,var(--wrap)); height:1px;
  background:linear-gradient(90deg,#2BD8FF 0%,#4B6BFB 26%,transparent 62%);
  opacity:.85;
}
.hero-data .grid3{ display:grid; grid-template-columns:repeat(3,1fr); }
.hero-data .cell{ padding:30px 0; border-right:1px solid var(--ink-line); }
.hero-data .cell:last-child{ border-right:none; }
.hero-data .cell:not(:first-child){ padding-left:38px; }
.hero-data b{
  display:block; color:var(--inv); font-size:1.5rem; font-weight:600;
  letter-spacing:-.015em; line-height:1.25;
}
.hero-data span{ display:block; margin-top:6px; color:var(--inv-3); font-size:.85rem; letter-spacing:.05em; }

.eyebrow{
  display:inline-flex; align-items:center; gap:9px;
  font-size:.8rem; letter-spacing:.14em; color:var(--brand);
  text-transform:uppercase;
  border:1px solid rgba(43,216,255,.28);
  background:var(--brand-soft);
  border-radius:100px; padding:6px 15px;
}
.eyebrow::before{
  content:""; width:5px; height:5px; border-radius:50%;
  background:var(--brand); box-shadow:0 0 0 4px rgba(43,216,255,.16);
}

.hero h1{
  margin-top:26px;
  font-size:clamp(1.85rem,5.6vw,3.9rem);
  font-weight:600; line-height:1.14; letter-spacing:-.02em;
  color:var(--inv);
}
.hero h1 em{
  font-style:normal;
  background:var(--brand-grad);
  -webkit-background-clip:text; background-clip:text; color:transparent;
}
.hero-lead{
  margin-top:22px; max-width:620px;
  font-size:clamp(1rem,1.9vw,1.16rem); line-height:1.75; color:var(--inv-2);
}
.hero-actions{ display:flex; flex-wrap:wrap; gap:14px; margin-top:38px; }

.btn{
  display:inline-flex; align-items:center; gap:9px;
  height:48px; padding:0 26px; border-radius:100px;
  font-size:.94rem; font-weight:500; white-space:nowrap;
  transition:transform .25s var(--ease), background .25s var(--ease),
             border-color .25s var(--ease), color .25s var(--ease);
}
.btn-primary{ background:var(--brand-grad); color:#06121C; }
.btn-primary:hover{ transform:translateY(-2px); }
.btn-ghost{ border:1px solid rgba(255,255,255,.18); color:var(--inv); }
.btn-ghost:hover{ border-color:rgba(43,216,255,.5); color:var(--brand); transform:translateY(-2px); }
.btn svg{ width:15px; height:15px; flex:none; }

/* ---------- 浅色内容区 ---------- */
.sec{ padding:var(--sec) 0; }
.sec-alt{ background:var(--paper-2); border-top:1px solid var(--line); border-bottom:1px solid var(--line); }

.sec-head{ max-width:660px; margin-bottom:52px; }
.sec-head h2{
  font-size:clamp(1.5rem,3vw,2.05rem);
  font-weight:600; letter-spacing:-.015em; line-height:1.25;
}
.sec-head h2::before{
  content:""; display:block; width:36px; height:3px; border-radius:3px;
  background:var(--brand-grad); margin-bottom:20px;
}
.sec-head p{ margin-top:14px; color:var(--txt-2); font-size:1rem; }

.grid{ display:grid; grid-template-columns:1fr; gap:20px; }
.cols-3{ grid-template-columns:repeat(3,1fr); }
.cols-2{ grid-template-columns:repeat(2,1fr); }

/* ---------- 能力卡 ---------- */
.cap{
  position:relative; overflow:hidden;
  background:var(--paper); border:1px solid var(--line); border-radius:var(--r-md);
  padding:30px 28px 32px;
  transition:transform .3s var(--ease), border-color .3s var(--ease),
             box-shadow .3s var(--ease);
}
.cap::before{                       /* hover 时顶部渐显的渐变线 */
  content:""; position:absolute; top:0; left:0; right:0; height:2px;
  background:var(--brand-grad); opacity:0;
  transition:opacity .3s var(--ease);
}
.cap:hover{ transform:translateY(-4px); border-color:#CFE6F2; box-shadow:0 18px 40px -22px rgba(16,29,48,.28); }
.cap:hover::before{ opacity:1; }
.cap-ico{ width:38px; height:38px; margin-bottom:20px; color:var(--brand-2); }
.cap-num{
  position:absolute; top:26px; right:28px;
  font-family:ui-monospace, "SFMono-Regular", Consolas, "Liberation Mono", monospace;
  font-size:.74rem; letter-spacing:.16em; color:#B9C3CE;
}
.cap h3{ font-size:1.06rem; font-weight:600; letter-spacing:-.005em; }
.cap p{ margin-top:10px; color:var(--txt-2); font-size:.94rem; line-height:1.72; }

/* ---------- 产品卡 ---------- */
.prod{
  position:relative; overflow:hidden;
  display:flex; flex-direction:column;
  background:var(--paper); border:1px solid var(--line); border-radius:var(--r-lg);
  padding:34px 32px 32px;
  transition:transform .3s var(--ease), border-color .3s var(--ease),
             box-shadow .3s var(--ease);
}
.prod:hover{ transform:translateY(-4px); border-color:#CFE6F2; box-shadow:0 22px 48px -24px rgba(16,29,48,.3); }

/* 产品视觉预览：纯 CSS + 内联 SVG 画的抽象界面，示意而非真实截图 */
.prod-shot{
  position:relative; overflow:hidden;
  height:158px; border-radius:12px; margin-bottom:26px;
  background:
    radial-gradient(70% 90% at 78% 12%, rgba(43,216,255,.16), transparent 70%),
    radial-gradient(60% 80% at 12% 88%, rgba(75,107,251,.18), transparent 72%),
    linear-gradient(150deg,#0D1524 0%,#0A0F1A 100%);
  border:1px solid rgba(255,255,255,.07);
}
.prod-shot::before{                 /* 预览区内的细网格 */
  content:""; position:absolute; inset:0;
  background-image:
    linear-gradient(to right, rgba(255,255,255,.05) 1px, transparent 1px),
    linear-gradient(to bottom, rgba(255,255,255,.05) 1px, transparent 1px);
  background-size:26px 26px;
}
.prod-shot svg{ position:absolute; inset:0; width:100%; height:100%; }
.prod:hover .prod-shot{ border-color:rgba(43,216,255,.28); }

.prod-head{ display:flex; align-items:center; gap:14px; }
.prod-ico{
  width:46px; height:46px; flex:none; border-radius:12px;
  background:linear-gradient(140deg, rgba(43,216,255,.16), rgba(75,107,251,.16));
  display:flex; align-items:center; justify-content:center; color:var(--brand-2);
}
.prod-ico svg{ width:24px; height:24px; }
.prod h3{ font-size:1.14rem; font-weight:600; }
.prod .tag{ font-size:.76rem; color:var(--txt-3); letter-spacing:.06em; margin-top:2px; }
.prod p{ margin-top:18px; color:var(--txt-2); font-size:.95rem; line-height:1.75; flex:1; }
.prod-link{
  margin-top:26px; display:inline-flex; align-items:center; gap:8px;
  font-size:.92rem; font-weight:500; color:var(--brand-2);
}
.prod-link svg{ width:14px; height:14px; transition:transform .25s var(--ease); }
.prod-link:hover svg{ transform:translate(3px,-3px); }

/* ---------- 内页页头 ---------- */
.page-head{
  position:relative; overflow:hidden;
  background:var(--ink); padding:74px 0 78px;
  border-bottom:1px solid var(--ink-line);
}
.page-head::before{
  content:""; position:absolute; inset:0;
  background-image:
    linear-gradient(to right, rgba(255,255,255,.05) 1px, transparent 1px),
    linear-gradient(to bottom, rgba(255,255,255,.05) 1px, transparent 1px);
  background-size:64px 64px;
  mask-image:radial-gradient(110% 100% at 12% 0%, #000 20%, transparent 76%);
  -webkit-mask-image:radial-gradient(110% 100% at 12% 0%, #000 20%, transparent 76%);
}
.page-head .wrap{ position:relative; z-index:2; }
.crumb{ font-size:.82rem; color:var(--inv-3); letter-spacing:.06em; }
.crumb a:hover{ color:var(--brand); }
.page-head h1{
  margin-top:16px; color:var(--inv);
  font-size:clamp(1.9rem,4vw,2.7rem); font-weight:600; letter-spacing:-.02em;
}
.page-head p{ margin-top:14px; max-width:600px; color:var(--inv-2); font-size:1rem; }

/* ---------- 列表 / 表格 ---------- */
.rows{ border:1px solid var(--line); border-radius:var(--r-md); overflow:hidden; background:var(--paper); }
.row{ display:flex; gap:24px; padding:20px 26px; border-bottom:1px solid var(--line); }
.row:last-child{ border-bottom:none; }
.row dt{ flex:0 0 168px; color:var(--txt-3); font-size:.9rem; }
.row dd{ color:var(--txt); font-size:.94rem; }
.row dd a{ color:var(--brand-2); }
.row dd a:hover{ text-decoration:underline; }

.prose p{ color:var(--txt-2); margin-bottom:16px; max-width:720px; }
.prose p:last-child{ margin-bottom:0; }

/* ---------- CTA ---------- */
.cta{
  position:relative; overflow:hidden;
  background:var(--ink); border-radius:var(--r-lg);
  padding:74px 64px; display:flex; align-items:center;
  justify-content:space-between; gap:40px; flex-wrap:wrap;
}
.cta::after{
  content:""; position:absolute; right:-4%; top:-70%;
  width:46%; height:220%;
  background:radial-gradient(closest-side, rgba(43,216,255,.15), transparent 68%);
  filter:blur(18px); pointer-events:none;
}
.cta > *{ position:relative; z-index:2; }
.cta h2{ color:var(--inv); font-size:clamp(1.35rem,2.6vw,1.85rem); font-weight:600; letter-spacing:-.015em; }
.cta p{ margin-top:12px; color:var(--inv-2); font-size:.96rem; max-width:520px; }

/* ---------- 页脚 ---------- */
.site-footer{
  background:var(--ink); border-top:1px solid var(--ink-line);
  padding:64px 0 34px; color:var(--inv-2); font-size:.9rem;
}
.foot-top{
  display:grid; grid-template-columns:1.6fr 1fr 1fr; gap:40px;
  padding-bottom:40px; border-bottom:1px solid var(--ink-line);
}
.foot-brand .brand-name{ font-size:1rem; }
.foot-brand p{ margin-top:16px; color:var(--inv-3); font-size:.88rem; max-width:320px; line-height:1.75; }
.foot-col h4{ color:var(--inv); font-size:.82rem; font-weight:500; letter-spacing:.1em; margin-bottom:16px; }
.foot-col a, .foot-col span{ display:block; color:var(--inv-2); font-size:.9rem; padding:5px 0; }
.foot-col a:hover{ color:var(--brand); }
.foot-bottom{
  display:flex; align-items:center; justify-content:center;
  flex-wrap:wrap; gap:8px 18px;
  padding-top:26px; color:var(--inv-3); font-size:.84rem;
}
.foot-bottom a{ color:var(--inv-3); }
.foot-bottom a:hover{ color:var(--brand); }
.foot-bottom .sep{ color:#2B3244; }

/* ---------- 联系方式：大邮箱 ---------- */
.mailbig{
  display:inline-block; word-break:break-all;
  font-size:clamp(1.35rem,4.2vw,2.5rem); font-weight:600; letter-spacing:-.02em;
  background:var(--brand-grad);
  -webkit-background-clip:text; background-clip:text; color:transparent;
  transition:opacity .25s var(--ease);
}
.mailbig:hover{ opacity:.8; }

/* ---------- 404 ---------- */
.err-code{
  font-family:ui-monospace, "SFMono-Regular", Consolas, monospace;
  font-size:clamp(4.5rem,16vw,9rem); font-weight:600; line-height:1; letter-spacing:-.04em;
  background:var(--brand-grad);
  -webkit-background-clip:text; background-clip:text; color:transparent;
}

/* ---------- 滚动淡入（JS 关闭时内容照常可见） ---------- */
html.js-reveal .rv{
  opacity:0; transform:translateY(18px);
  transition:opacity .6s var(--ease), transform .6s var(--ease);
}
html.js-reveal .rv.in{ opacity:1; transform:none; }

@media (prefers-reduced-motion: reduce){
  html{ scroll-behavior:auto; }
  html.js-reveal .rv{ opacity:1; transform:none; transition:none; }
  .cap:hover, .prod:hover, .btn:hover{ transform:none; }
}

/* ---------- 响应式 ---------- */
@media (max-width:900px){
  :root{ --sec:76px; }
  .cols-3{ grid-template-columns:1fr 1fr; }
  .foot-top{ grid-template-columns:1fr 1fr; }
  .cta{ padding:52px 40px; }
  .hero-content{ padding:104px 0 84px; }
}
@media (max-width:640px){
  :root{ --sec:60px; --gut:20px; }
  .hero-content{ padding:68px 0 60px; }
  .hero-watermark{ display:none; }
  .hero-data .grid3{ grid-template-columns:1fr; }
  .hero-data .cell{ padding:20px 0; border-right:none; border-bottom:1px solid var(--ink-line); }
  .hero-data .cell:not(:first-child){ padding-left:0; }
  .hero-data .cell:last-child{ border-bottom:none; }
  .hero-data b{ font-size:1.25rem; }
  .cols-3, .cols-2{ grid-template-columns:1fr; }
  .foot-top{ grid-template-columns:1fr; gap:30px; }
  .site-nav a{ padding:8px 9px; font-size:.88rem; }
  .brand-en{ display:none; }
  .row{ flex-direction:column; gap:6px; }
  .row dt{ flex:none; }
  .cta{ padding:38px 26px; }
  .page-head{ padding:56px 0 60px; }
  .prod-shot{ height:136px; }
}