/* ============================================================
   海派AI建站 · 全局设计系统 base.css
   设计语言：Apple 官网式 / 高级感 / 明暗分区 / 渐变点缀
============================================================ */

/* ---------- 设计变量 ---------- */
:root{
  --bg:#ffffff;
  --bg-alt:#f5f5f7;
  --dark:#050507;
  --dark-2:#0b0b10;
  --text:#1d1d1f;
  --text-2:#6e6e73;
  --text-3:#86868b;
  --d-text:#f5f5f7;
  --d-text-2:rgba(235,235,245,.62);
  --line:rgba(0,0,0,.08);
  --line-strong:rgba(0,0,0,.14);
  --line-dark:rgba(255,255,255,.10);
  --blue:#2f6bff;
  --violet:#8a4dff;
  --teal:#00c8b4;
  --grad:linear-gradient(120deg,#2f6bff 0%,#8a4dff 52%,#00c8b4 100%);
  --grad-soft:linear-gradient(120deg,rgba(47,107,255,.10),rgba(138,77,255,.10) 55%,rgba(0,200,180,.10));
  --container:1200px;
  --nav-h:64px;
  --radius:24px;
  --radius-s:14px;
  --shadow-card:0 8px 30px rgba(0,0,0,.06);
  --shadow-card-hover:0 26px 60px rgba(0,0,0,.13);
  --font:-apple-system,BlinkMacSystemFont,"SF Pro Display","SF Pro SC","PingFang SC","HarmonyOS Sans SC","Microsoft YaHei","Segoe UI",Roboto,"Helvetica Neue",Arial,sans-serif;
  --mono:ui-monospace,SFMono-Regular,"SF Mono",Consolas,"Courier New",monospace;
  --ease:cubic-bezier(.22,1,.36,1);
}

/* ---------- Reset ---------- */
*,*::before,*::after{box-sizing:border-box;margin:0;padding:0}
html{scroll-behavior:smooth;scroll-padding-top:calc(var(--nav-h) + 24px);-webkit-text-size-adjust:100%}
body{font-family:var(--font);font-size:16px;line-height:1.6;color:var(--text);background:var(--bg);-webkit-font-smoothing:antialiased;text-rendering:optimizeLegibility;overflow-x:hidden}
img,svg{display:block;max-width:100%}
a{color:inherit;text-decoration:none;transition:color .25s ease,opacity .25s ease}
ul,ol{list-style:none}
button{font-family:inherit;border:0;background:none;cursor:pointer;color:inherit}
::selection{background:rgba(47,107,255,.18)}
a:focus-visible,button:focus-visible{outline:2px solid var(--blue);outline-offset:3px;border-radius:6px}
body.menu-open{overflow:hidden}

/* ---------- 布局容器 ---------- */
.container{width:92%;max-width:var(--container);margin-inline:auto}
.section{padding:clamp(84px,9vw,132px) 0;position:relative}
.section-alt{background:var(--bg-alt)}
.section-dark{background:var(--dark);color:var(--d-text)}

/* ---------- 标题体系 ---------- */
.section-head{max-width:780px;margin:0 auto clamp(48px,6vw,84px);text-align:center;position:relative;z-index:1}
.section-head.left{text-align:left;margin-left:0}
.eyebrow{display:inline-flex;align-items:center;gap:10px;font-size:12.5px;font-weight:700;letter-spacing:.22em;text-transform:uppercase;color:var(--text-3);margin-bottom:18px}
.eyebrow::before{content:"";width:22px;height:3px;border-radius:2px;background:var(--grad)}
.section-dark .eyebrow{color:var(--d-text-2)}
h1,h2,h3,h4{font-weight:700;letter-spacing:-.015em;line-height:1.15}
.section-head h2,.block-title{font-size:clamp(30px,4.6vw,54px)}
.section-sub{margin-top:20px;font-size:clamp(15.5px,1.6vw,18px);line-height:1.75;color:var(--text-2)}
.section-dark .section-sub{color:var(--d-text-2)}
.grad-text{background:var(--grad);-webkit-background-clip:text;background-clip:text;-webkit-text-fill-color:transparent;color:transparent}

/* ---------- 按钮 ---------- */
.btn{display:inline-flex;align-items:center;justify-content:center;gap:9px;padding:14px 30px;border-radius:999px;font-size:15px;font-weight:600;letter-spacing:.01em;transition:transform .35s var(--ease),box-shadow .35s var(--ease),background .3s ease,color .3s ease,border-color .3s ease;will-change:transform}
.btn:active{transform:scale(.96)}
.btn .bi{font-size:1.05em;transition:transform .3s var(--ease)}
.btn:hover .bi-arrow-right{transform:translateX(4px)}
.btn-primary{background:var(--grad);background-size:170% 100%;background-position:0 0;color:#fff;box-shadow:0 12px 30px rgba(63,94,251,.32)}
.btn-primary:hover{background-position:100% 0;box-shadow:0 18px 44px rgba(63,94,251,.42);transform:translateY(-2px)}
.btn-ghost{color:var(--text);border:1px solid var(--line-strong);background:transparent}
.btn-ghost:hover{background:rgba(0,0,0,.045);transform:translateY(-2px)}
.btn-light{background:#fff;color:#0a0a0c}
.btn-light:hover{background:#e8e8ed;transform:translateY(-2px)}
.btn-ghost-light{color:#fff;border:1px solid rgba(255,255,255,.32);background:transparent}
.btn-ghost-light:hover{background:rgba(255,255,255,.1);transform:translateY(-2px)}
.btn-sm{padding:9px 20px;font-size:13.5px}
.link-arrow{display:inline-flex;align-items:center;gap:7px;font-size:14.5px;font-weight:600;color:var(--blue)}
.link-arrow .bi{transition:transform .3s var(--ease)}
.link-arrow:hover .bi{transform:translateX(5px)}

/* ---------- 图标容器 ---------- */
.ic{width:56px;height:56px;border-radius:16px;display:grid;place-items:center;font-size:24px;background:var(--grad-soft);color:var(--blue);flex:none}
.ic-sm{width:46px;height:46px;border-radius:13px;font-size:20px}

/* ---------- 徽章 / 胶囊 ---------- */
.chip{display:inline-flex;align-items:center;gap:8px;padding:10px 20px;border-radius:999px;border:1px solid var(--line-strong);font-size:14px;font-weight:500;color:var(--text-2);background:rgba(255,255,255,.7)}
.chip .bi{color:var(--blue)}

/* ---------- 导航栏 ---------- */
.nav{position:fixed;inset:0 0 auto 0;z-index:1000;height:var(--nav-h);transition:background .4s ease,box-shadow .4s ease,border-color .4s ease;border-bottom:1px solid transparent}
.nav-inner{height:100%;width:100%;padding:0 clamp(20px,4vw,48px);display:flex;align-items:center;justify-content:space-between;gap:24px}
.brand{display:inline-flex;align-items:center;gap:10px;font-size:17px;font-weight:700;letter-spacing:-.01em}
.brand-mark{width:30px;height:30px;border-radius:9px;background:var(--grad);display:grid;place-items:center;color:#fff;font-size:15px;box-shadow:0 6px 16px rgba(80,90,255,.35)}
.nav-links{display:flex;align-items:center;gap:clamp(20px,2.6vw,36px)}
.nav-links a{font-size:14px;font-weight:500;color:rgba(29,29,31,.72);position:relative;padding:6px 0}
.nav-links a::after{content:"";position:absolute;left:0;bottom:0;width:100%;height:2px;border-radius:2px;background:var(--grad);transform:scaleX(0);transform-origin:left;transition:transform .35s var(--ease)}
.nav-links a:hover{color:var(--text)}
.nav-links a.active{color:var(--text)}
.nav-links a.active::after,.nav-links a:hover::after{transform:scaleX(1)}
.nav-cta{display:flex;align-items:center;gap:14px}
.nav-burger{display:none;width:40px;height:40px;border-radius:10px;font-size:22px;align-items:center;justify-content:center;transition:background .25s}
.nav-burger:hover{background:rgba(0,0,0,.05)}
.nav.is-scrolled{background:rgba(255,255,255,.72);-webkit-backdrop-filter:blur(20px) saturate(180%);backdrop-filter:blur(20px) saturate(180%);border-bottom-color:var(--line)}

/* ---------- 移动端全屏抽屉 ---------- */
.drawer{position:fixed;inset:0;z-index:990;background:rgba(255,255,255,.96);-webkit-backdrop-filter:blur(24px);backdrop-filter:blur(24px);padding:calc(var(--nav-h) + 42px) 8% 48px;display:flex;flex-direction:column;opacity:0;pointer-events:none;transform:translateY(-10px);transition:opacity .4s ease,transform .4s var(--ease)}
body.menu-open .drawer{opacity:1;pointer-events:auto;transform:translateY(0)}
.drawer a.d-link{font-size:26px;font-weight:600;padding:17px 0;border-bottom:1px solid var(--line);color:var(--text)}
.drawer a.d-link.active{color:var(--blue)}
.drawer .d-foot{margin-top:auto;padding-top:30px}
.drawer .d-foot .btn{width:100%}
.drawer .d-note{margin-top:16px;font-size:13px;color:var(--text-3);text-align:center}

/* ---------- 数字统计 ---------- */
.stats{padding:clamp(60px,7vw,90px) 0}
.stats-grid{display:grid;grid-template-columns:repeat(4,1fr);gap:30px;text-align:center}
.stat-num{font-size:clamp(42px,5.2vw,62px);font-weight:700;letter-spacing:-.02em;line-height:1.1}
.stat-label{margin-top:10px;font-size:14.5px;color:var(--text-2)}

/* ---------- 流程步骤 ---------- */
.steps{display:grid;grid-template-columns:repeat(4,1fr);gap:clamp(24px,3vw,34px)}
.steps li{position:relative;padding-top:22px}
.steps li::before{content:"";position:absolute;top:0;left:0;width:44px;height:4px;border-radius:3px;background:var(--grad)}
.step-num{font-size:13px;font-weight:700;letter-spacing:.18em;color:var(--text-3)}
.steps h3{font-size:18.5px;margin:12px 0 10px}
.steps p{font-size:14.5px;line-height:1.75;color:var(--text-2)}

/* ---------- 对比条形图（明暗通用） ---------- */
.cmp{max-width:880px;margin:clamp(56px,7vw,88px) auto 0}
.cmp-head{display:grid;grid-template-columns:120px 1fr 1fr;gap:clamp(14px,3vw,36px);font-size:12.5px;font-weight:700;letter-spacing:.14em;text-transform:uppercase;color:var(--text-3);padding:0 0 18px}
.cmp-head span:last-child{color:var(--blue);text-align:right}
.cmp-row{display:grid;grid-template-columns:120px 1fr 1fr;gap:clamp(14px,3vw,36px);align-items:center;padding:16px 0;border-top:1px solid var(--line)}
.cmp-name{font-size:14.5px;font-weight:600}
.bar{height:10px;border-radius:6px;background:rgba(0,0,0,.06);overflow:hidden}
.bar-fill{width:var(--w,100%);height:100%;border-radius:6px;transform:scaleX(0);transform-origin:left;transition:transform 1.3s var(--ease)}
.bar-fill.gray{background:#b9bec7}
.bar-fill.grad{background:var(--grad)}
.cmp-row:last-child{border-bottom:1px solid var(--line)}
.cmp.in .bar-fill{transform:scaleX(1)}
.cmp.in .cmp-row:nth-child(2) .bar-fill{transition-delay:.05s}
.cmp.in .cmp-row:nth-child(3) .bar-fill{transition-delay:.2s}
.cmp.in .cmp-row:nth-child(4) .bar-fill{transition-delay:.35s}
.section-dark .cmp-head{color:var(--d-text-2)}
.section-dark .cmp-head span:last-child{color:#7ab0ff}
.section-dark .cmp-row,.section-dark .cmp-row:last-child{border-color:var(--line-dark)}
.section-dark .bar{background:rgba(255,255,255,.09)}
.section-dark .bar-fill.gray{background:rgba(255,255,255,.28)}

/* ---------- FAQ ---------- */
.faq-wrap{max-width:820px;margin:0 auto}
.faq-item{border-bottom:1px solid var(--line)}
.faq-q{width:100%;display:flex;align-items:center;justify-content:space-between;gap:20px;padding:25px 4px;text-align:left;font-size:17px;font-weight:600;color:var(--text)}
.faq-q .bi{font-size:18px;color:var(--text-3);transition:transform .4s var(--ease),color .3s;flex:none}
.faq-item.open .faq-q .bi{transform:rotate(45deg);color:var(--blue)}
.faq-a{max-height:0;overflow:hidden;transition:max-height .5s var(--ease)}
.faq-a p{padding:0 40px 26px 4px;font-size:15.5px;line-height:1.85;color:var(--text-2)}

/* ---------- CTA 行动区 ---------- */
.cta-band{padding:clamp(50px,6vw,80px) 0 clamp(90px,10vw,140px)}
.cta-inner{position:relative;overflow:hidden;background:var(--dark);border-radius:32px;padding:clamp(60px,8vw,110px) clamp(28px,6vw,80px);text-align:center;color:var(--d-text)}
/* 极光流动层：三色光斑缓慢漂移旋转 */
.cta-inner::before{content:"";position:absolute;inset:-45%;z-index:0;pointer-events:none;filter:blur(70px);will-change:transform;background:
  radial-gradient(38% 42% at 28% 32%,rgba(47,107,255,.46),transparent 62%),
  radial-gradient(34% 38% at 72% 58%,rgba(138,77,255,.42),transparent 62%),
  radial-gradient(30% 34% at 54% 20%,rgba(0,200,180,.34),transparent 62%);
  animation:ctaFlow 7s ease-in-out infinite alternate}
/* 呼吸光晕 */
.cta-inner::after{content:"";position:absolute;width:420px;height:420px;border-radius:50%;background:rgba(0,200,180,.16);filter:blur(90px);pointer-events:none;bottom:-220px;right:-100px;z-index:0;will-change:transform,opacity;animation:ctaGlow 5s ease-in-out infinite alternate}
@keyframes ctaFlow{
  0%{transform:translate3d(-6%,-4%,0) rotate(0deg) scale(1)}
  50%{transform:translate3d(6%,8%,0) rotate(14deg) scale(1.28)}
  100%{transform:translate3d(-8%,4%,0) rotate(-10deg) scale(1.08)}
}
@keyframes ctaGlow{
  0%{transform:translate3d(0,0,0) scale(1);opacity:.6}
  100%{transform:translate3d(-90px,-60px,0) scale(1.3);opacity:1}
}
@media (prefers-reduced-motion:reduce){
  .cta-inner::before,.cta-inner::after{animation:none}
}
@media (max-width:640px){
  .cta-inner::before{filter:blur(46px)}
}
.cta-inner>*{position:relative;z-index:1}
.cta-eyebrow{display:inline-block;font-size:12.5px;font-weight:700;letter-spacing:.24em;text-transform:uppercase;color:#7ab0ff;margin-bottom:22px}
.cta-inner h2{font-size:clamp(28px,4.4vw,50px)}
.cta-inner p{margin:20px auto 0;max-width:560px;font-size:16.5px;line-height:1.75;color:var(--d-text-2)}
.cta-actions{margin-top:38px;display:flex;justify-content:center;gap:16px;flex-wrap:wrap}

/* ---------- 微信二维码弹窗 ---------- */
.wx-modal{position:fixed;inset:0;z-index:1200;display:grid;place-items:center;padding:24px;visibility:hidden;opacity:0;transition:opacity .35s ease,visibility 0s linear .35s}
.wx-modal.open{visibility:visible;opacity:1;transition:opacity .35s ease}
body.wx-open{overflow:hidden}
.wx-mask{position:absolute;inset:0;background:rgba(8,8,12,.55);-webkit-backdrop-filter:blur(8px);backdrop-filter:blur(8px)}
.wx-card{position:relative;background:#fff;border-radius:24px;padding:38px 36px 32px;text-align:center;max-width:320px;width:100%;box-shadow:0 40px 100px rgba(0,0,0,.35);transform:translateY(18px) scale(.96);transition:transform .45s var(--ease)}
.wx-modal.open .wx-card{transform:none}
.wx-close{position:absolute;top:14px;right:14px;width:34px;height:34px;border-radius:50%;display:grid;place-items:center;font-size:15px;color:var(--text-3);background:rgba(0,0,0,.05);transition:background .25s ease,color .25s ease}
.wx-close:hover{background:rgba(0,0,0,.09);color:var(--text)}
.wx-head{display:flex;align-items:center;justify-content:center;gap:10px;margin-bottom:20px}
.wx-head h3{font-size:18px}
.wx-ic{width:38px;height:38px;border-radius:11px;background:rgba(7,193,96,.12);color:#07c160;display:grid;place-items:center;font-size:20px;flex:none}
.wx-qr{display:block;width:min(210px,64vw);height:min(210px,64vw);margin:0 auto;border-radius:12px;border:1px solid var(--line)}
.wx-name{margin-top:18px;font-size:15.5px;font-weight:700}
.wx-name a{color:var(--blue)}
.wx-tip{margin-top:8px;font-size:12.5px;color:var(--text-3)}

/* ---------- 侧边浮动客服 ---------- */
.float-contact{position:fixed;right:clamp(14px,2vw,26px);bottom:calc(26px + env(safe-area-inset-bottom,0px));z-index:890;display:flex;flex-direction:column;gap:12px}
.fc-btn{position:relative;width:52px;height:52px;border-radius:14px;background:#fff;color:var(--text);border:1px solid var(--line);display:flex;align-items:center;justify-content:center;font-size:22px;box-shadow:0 10px 30px rgba(0,0,0,.14);transition:transform .3s var(--ease),box-shadow .3s var(--ease),background .3s,color .3s,border-color .3s}
.fc-btn:hover{transform:translateY(-4px)}
.fc-btn .bi{transition:color .3s,transform .3s var(--ease)}
.fc-wx{background:#07c160;border-color:#07c160;color:#fff;box-shadow:0 10px 30px rgba(7,193,96,.30)}
.fc-wx:hover{background:#06ad56;border-color:#06ad56;color:#fff;box-shadow:0 14px 34px rgba(7,193,96,.42)}
.fc-tel{color:var(--blue)}
.fc-tel:hover{background:var(--blue);border-color:var(--blue);color:#fff;box-shadow:0 14px 34px rgba(47,107,255,.32)}
.fc-top{background:var(--dark);border-color:var(--dark);color:#fff;opacity:0;visibility:hidden;transform:translateY(14px);pointer-events:none;transition:transform .4s var(--ease),opacity .4s ease,visibility 0s linear .4s,background .3s}
.fc-top.visible{opacity:1;visibility:visible;transform:none;pointer-events:auto;transition:transform .4s var(--ease),opacity .4s ease,background .3s}
.fc-top:hover{background:#2a2a30}
.fc-tip{position:absolute;right:calc(100% + 12px);top:50%;transform:translateY(-50%) translateX(6px);background:rgba(17,17,22,.92);color:#fff;font-size:12.5px;font-weight:600;padding:8px 12px;border-radius:8px;white-space:nowrap;opacity:0;pointer-events:none;transition:opacity .25s ease,transform .25s var(--ease)}
.fc-tip::after{content:"";position:absolute;left:100%;top:50%;transform:translateY(-50%);border:5px solid transparent;border-left-color:rgba(17,17,22,.92)}
.fc-btn:hover .fc-tip{opacity:1;transform:translateY(-50%) translateX(0)}
@media (max-width:640px){
  .float-contact{right:12px;bottom:calc(18px + env(safe-area-inset-bottom,0px))}
  .fc-btn{width:46px;height:46px;font-size:19px;border-radius:12px}
  .fc-tip{display:none}
}

/* ---------- 页脚 ---------- */
.footer{background:var(--dark);color:#a1a1a6;padding:clamp(80px,9vw,110px) 0 40px}
.footer-top{display:flex;align-items:center;justify-content:space-between;gap:28px;flex-wrap:wrap;padding-bottom:clamp(48px,6vw,70px);border-bottom:1px solid var(--line-dark)}
.footer-top h2{color:#fff;font-size:clamp(26px,3.8vw,44px);max-width:640px}
.footer-top .btn{flex:none}
.footer-grid{display:grid;grid-template-columns:1.6fr 1fr 1fr 1.3fr;gap:clamp(32px,4vw,52px);padding:clamp(48px,6vw,72px) 0}
.footer .brand{color:#fff}
.footer-about{margin-top:20px;font-size:14px;line-height:1.85;max-width:300px}
.footer-social{display:flex;gap:12px;margin-top:24px}
.footer-social a{width:38px;height:38px;border-radius:50%;border:1px solid var(--line-dark);display:grid;place-items:center;font-size:16px;color:#d2d2d7;transition:all .3s ease}
.footer-social a:hover{background:var(--grad);border-color:transparent;color:#fff;transform:translateY(-3px)}
.footer h4{color:#fff;font-size:14.5px;font-weight:600;margin-bottom:20px;letter-spacing:.02em}
.footer-col a{display:block;padding:7px 0;font-size:14px;color:#a1a1a6}
.footer-col a:hover{color:#fff}
.footer-contact li{display:flex;align-items:flex-start;gap:11px;font-size:14px;padding:9px 0;line-height:1.7}
.footer-contact .bi{color:#7ab0ff;margin-top:0px;flex:none}
.footer-contact span{flex:1;min-width:0}
.footer-contact a{display:inline;padding:0;color:#a1a1a6;transition:color .25s ease}
.footer-contact a:hover{color:#fff}
.footer-bottom{border-top:1px solid var(--line-dark);padding-top:26px;display:flex;justify-content:space-between;align-items:center;gap:14px;flex-wrap:wrap;font-size:13px;color:#6e6e73}
.footer-bottom a{color:#86868b}
.footer-bottom a:hover{color:#fff}
.footer-links{display:flex;gap:22px}

/* ---------- 通用卡片 ---------- */
.card{background:#fff;border:1px solid var(--line);border-radius:var(--radius);padding:clamp(26px,3vw,36px);box-shadow:var(--shadow-card);transition:transform .5s var(--ease),box-shadow .5s var(--ease)}
.card:hover{transform:translateY(-6px);box-shadow:var(--shadow-card-hover)}

/* ---------- 响应式 ---------- */
@media (max-width:1080px){
  .footer-grid{grid-template-columns:1.4fr 1fr 1fr}
  .footer-grid .f-contact{grid-column:1/-1}
}
@media (max-width:900px){
  .nav-links{display:none}
  .nav-burger{display:inline-flex}
  .steps{grid-template-columns:repeat(2,1fr)}
  .stats-grid{grid-template-columns:repeat(2,1fr);gap:38px 20px}
  .cmp-head,.cmp-row{grid-template-columns:92px 1fr 1fr}
  .footer-grid{grid-template-columns:1fr 1fr}
}
@media (max-width:640px){
  :root{--nav-h:58px}
  .nav-cta .btn{display:none}
  .steps{grid-template-columns:1fr}
  .stats-grid{grid-template-columns:repeat(2,1fr)}
  .stat-label{font-size:13px}
  .cmp-head{grid-template-columns:70px 1fr 1fr;font-size:11px;letter-spacing:.08em}
  .cmp-row{grid-template-columns:70px 1fr 1fr}
  .cmp-name{font-size:13px}
  .faq-q{font-size:15.5px}
  .footer-grid{grid-template-columns:1fr;gap:36px}
  .footer-top{flex-direction:column;align-items:flex-start}
  .footer-bottom{justify-content:center;text-align:center}
  .cta-actions .btn{width:100%;max-width:320px}
  .drawer a.d-link{font-size:22px;padding:15px 0}
}