/* =========================================================
   一滴泉 · 全屋净水 官网设计系统
   主题:深海蓝 × 水青 (呼应"一滴泉"品牌)
   ========================================================= */

:root{
  --brand-900:#062d47;
  --brand-800:#0a3d5e;
  --brand-700:#0e4f77;
  --brand-600:#12618f;
  --brand-500:#1779ad;

  --aqua-500:#12b3a8;
  --aqua-400:#22c7c0;
  --aqua-300:#5bd8d0;
  --aqua-100:#d9f4f2;

  --ink-900:#16282f;
  --ink-600:#4f6672;
  --ink-400:#7c939f;

  --bg-50:#f2f8fb;
  --bg-100:#e7f2f7;
  --line:#dfe9ef;
  --white:#ffffff;

  --shadow-sm:0 2px 10px rgba(6,45,71,.06);
  --shadow-md:0 10px 30px rgba(6,45,71,.10);
  --shadow-lg:0 24px 60px rgba(6,45,71,.16);

  --radius:16px;
  --radius-sm:10px;
  --container:1200px;
  --font:'PingFang SC','Hiragino Sans GB','Microsoft YaHei','Noto Sans SC',-apple-system,sans-serif;
}

*,*::before,*::after{box-sizing:border-box;margin:0;padding:0;}
html{scroll-behavior:smooth;-webkit-text-size-adjust:100%;}
body{font-family:var(--font);color:var(--ink-900);background:var(--white);line-height:1.75;font-size:16px;overflow-x:hidden;}
img,svg{display:block;max-width:100%;}
a{color:inherit;text-decoration:none;}
ul,ol{list-style:none;}
button{font-family:inherit;cursor:pointer;border:none;background:none;}
h1,h2,h3,h4{line-height:1.3;color:var(--brand-900);font-weight:700;}

.container{width:100%;max-width:var(--container);margin:0 auto;padding:0 24px;}
.grad-text{background:linear-gradient(100deg,var(--aqua-300),var(--aqua-400));-webkit-background-clip:text;background-clip:text;-webkit-text-fill-color:transparent;}

/* ---------- 通用按钮 ---------- */
.btn{display:inline-flex;align-items:center;justify-content:center;gap:8px;font-size:16px;font-weight:600;padding:14px 30px;border-radius:999px;transition:all .25s ease;white-space:nowrap;line-height:1.2;}
.btn svg{transition:transform .25s ease;}
.btn:hover svg{transform:translateX(4px);}
.btn-primary{background:linear-gradient(120deg,var(--aqua-500),var(--aqua-400));color:#fff;box-shadow:0 10px 24px rgba(18,179,168,.32);}
.btn-primary:hover{box-shadow:0 14px 30px rgba(18,179,168,.45);transform:translateY(-2px);}
.btn-outline{color:#fff;border:1.5px solid rgba(255,255,255,.55);background:transparent;}
.btn-outline:hover{background:rgba(255,255,255,.12);border-color:#fff;transform:translateY(-2px);}
.btn-dark{background:var(--brand-800);color:#fff;box-shadow:0 10px 24px rgba(10,61,94,.25);}
.btn-dark:hover{background:var(--brand-700);transform:translateY(-2px);}
.btn-lg{padding:17px 38px;font-size:17px;}

/* ---------- 区块标题 ---------- */
.sec{padding:96px 0;}
.sec.alt{background:var(--bg-50);}
.sec-head{max-width:640px;margin:0 auto 56px;text-align:center;}
.sec-eyebrow{display:inline-flex;align-items:center;gap:8px;font-size:13px;letter-spacing:.16em;color:var(--aqua-500);font-weight:700;text-transform:uppercase;margin-bottom:14px;}
.sec-eyebrow::before,.sec-eyebrow::after{content:"";width:22px;height:1.5px;background:linear-gradient(90deg,transparent,var(--aqua-400));}
.sec-eyebrow::after{background:linear-gradient(90deg,var(--aqua-400),transparent);}
.sec-head h2{font-size:clamp(28px,4vw,40px);letter-spacing:.01em;margin-bottom:16px;}
.sec-head p{color:var(--ink-600);font-size:17px;}

/* ---------- Header ---------- */
.site-header{position:sticky;top:0;z-index:100;background:rgba(255,255,255,.92);backdrop-filter:blur(14px);-webkit-backdrop-filter:blur(14px);border-bottom:1px solid transparent;transition:all .3s ease;}
.site-header.scrolled{box-shadow:var(--shadow-sm);border-bottom-color:var(--line);}
.nav{display:flex;align-items:center;justify-content:space-between;height:78px;}
.brand{display:flex;align-items:center;gap:12px;}
.brand-mark{width:44px;height:44px;flex:none;}
.brand-name{font-size:21px;font-weight:800;color:var(--brand-900);letter-spacing:.04em;line-height:1.1;}
.brand-name small{display:block;font-size:10.5px;font-weight:500;color:var(--ink-400);letter-spacing:.34em;margin-top:2px;}
.nav-links{display:flex;align-items:center;gap:6px;}
.nav-links a{padding:9px 16px;border-radius:999px;font-size:16px;color:var(--ink-600);font-weight:500;transition:all .22s ease;}
.nav-links a:hover{color:var(--brand-700);background:var(--bg-100);}
.nav-links a.active{color:var(--brand-800);background:var(--bg-100);font-weight:700;}
.nav-cta{margin-left:14px;}
.nav-toggle{display:none;flex-direction:column;gap:5px;padding:10px;border-radius:10px;}
.nav-toggle span{width:24px;height:2.2px;background:var(--brand-800);border-radius:2px;transition:all .3s ease;}
.nav-toggle.open span:nth-child(1){transform:translateY(7.2px) rotate(45deg);}
.nav-toggle.open span:nth-child(2){opacity:0;}
.nav-toggle.open span:nth-child(3){transform:translateY(-7.2px) rotate(-45deg);}

/* ---------- 通用 Hero ---------- */
.page-hero{position:relative;background:linear-gradient(150deg,var(--brand-900) 0%,var(--brand-800) 55%,var(--brand-600) 100%);color:#fff;padding:92px 0 120px;overflow:hidden;}
.page-hero::before{content:"";position:absolute;inset:0;background:radial-gradient(640px 340px at 85% -10%,rgba(34,199,192,.28),transparent 60%),radial-gradient(520px 300px at 8% 110%,rgba(23,121,173,.35),transparent 60%);}
.page-hero .container{position:relative;z-index:2;}
.page-hero .crumb{display:inline-flex;align-items:center;gap:8px;font-size:14px;color:rgba(255,255,255,.72);margin-bottom:20px;}
.page-hero .crumb a:hover{color:var(--aqua-300);}
.page-hero h1{color:#fff;font-size:clamp(32px,4.6vw,52px);margin-bottom:18px;letter-spacing:.01em;}
.page-hero p.lead{color:rgba(255,255,255,.86);font-size:clamp(16px,1.6vw,19px);max-width:640px;}
.wave-divider{position:absolute;left:0;right:0;bottom:-1px;line-height:0;}
.wave-divider svg{width:100%;height:70px;display:block;}

/* ---------- Footer ---------- */
.site-footer{background:var(--brand-900);color:rgba(255,255,255,.78);position:relative;overflow:hidden;}
.site-footer::before{content:"";position:absolute;inset:0;background:radial-gradient(560px 260px at 90% 0,rgba(34,199,192,.12),transparent 60%);}
.footer-main{position:relative;display:grid;grid-template-columns:1.5fr 1fr 1fr 1.3fr;gap:44px;padding:72px 0 48px;}
.footer-brand p{margin:18px 0 22px;max-width:300px;color:rgba(255,255,255,.65);font-size:15px;}
.footer-social{display:flex;gap:10px;}
.footer-social a{width:38px;height:38px;border-radius:50%;display:flex;align-items:center;justify-content:center;background:rgba(255,255,255,.08);border:1px solid rgba(255,255,255,.14);transition:all .25s;}
.footer-social a:hover{background:var(--aqua-500);border-color:var(--aqua-500);transform:translateY(-3px);}
.footer-col h4{color:#fff;font-size:16px;margin-bottom:18px;position:relative;padding-bottom:10px;}
.footer-col h4::after{content:"";position:absolute;left:0;bottom:0;width:26px;height:2.5px;border-radius:2px;background:linear-gradient(90deg,var(--aqua-400),var(--aqua-300));}
.footer-col li{margin-bottom:11px;}
.footer-col a,.footer-col span{color:rgba(255,255,255,.7);font-size:15px;transition:color .2s;}
.footer-col a:hover{color:var(--aqua-300);}
.footer-contact li{display:flex;gap:12px;align-items:flex-start;}
.footer-contact svg{flex:none;margin-top:4px;}
.footer-bottom{position:relative;border-top:1px solid rgba(255,255,255,.12);padding:20px 0;display:flex;justify-content:space-between;gap:12px;flex-wrap:wrap;font-size:13.5px;color:rgba(255,255,255,.5);}

/* ---------- Reveal 动效 ---------- */
html.js [data-reveal]{opacity:0;transform:translateY(26px);transition:opacity .7s ease,transform .7s ease;}
html.js [data-reveal].revealed{opacity:1;transform:none;}
html.js [data-reveal="left"]{transform:translateX(-30px);}
html.js [data-reveal="right"]{transform:translateX(30px);}
html.js [data-reveal="left"].revealed,html.js [data-reveal="right"].revealed{transform:none;}

/* ---------- 移动端 ---------- */
@media(max-width:1024px){
  .footer-main{grid-template-columns:1fr 1fr;}
}
@media(max-width:900px){
  .nav-cta{display:none;}
}
@media(max-width:820px){
  .nav-toggle{display:flex;}
  .nav-links{position:fixed;inset:78px 0 auto 0;background:#fff;flex-direction:column;align-items:stretch;padding:18px 24px 26px;gap:2px;box-shadow:var(--shadow-lg);transform:translateY(-130%);transition:transform .35s ease;border-radius:0 0 18px 18px;z-index:99;}
  .nav-links.open{transform:none;}
  .nav-links a{padding:14px 16px;font-size:17px;}
  .sec{padding:68px 0;}
  .footer-main{grid-template-columns:1fr;gap:36px;padding:56px 0 36px;}
  .footer-bottom{flex-direction:column;text-align:center;}
}

/* ---------- 通用 CTA 底纹(多页复用) ---------- */
.cta-band{position:relative;overflow:hidden;background:linear-gradient(140deg,var(--brand-900),var(--brand-700) 70%,var(--brand-600));color:#fff;padding:84px 0;}
.cta-band::before{content:"";position:absolute;inset:0;background:radial-gradient(500px 260px at 12% 0,rgba(34,199,192,.22),transparent 60%),radial-gradient(460px 300px at 100% 100%,rgba(23,121,173,.5),transparent 60%);}
.cta-in{position:relative;z-index:2;text-align:center;max-width:760px;margin:0 auto;}
.cta-in h2{color:#fff;font-size:clamp(26px,3.4vw,38px);margin-bottom:14px;}
.cta-in p{color:rgba(255,255,255,.82);margin-bottom:32px;font-size:17px;}
.hero-ctas{display:flex;gap:16px;flex-wrap:wrap;margin-bottom:40px;}
.cta-in .hero-ctas{justify-content:center;}

/* 辅助 */
.text-aqua{color:var(--aqua-500);}
.text-white{color:#fff;}
.mt-0{margin-top:0;}
.tac{text-align:center;}

/* =========================================================
   Hero 轮播 Banner(首页首屏)
   ========================================================= */
.hero-slider{position:relative;color:#fff;overflow:hidden;background:#062d47;}
.hs-track{position:relative;z-index:2;}
.hs-slide{position:absolute;inset:0;opacity:0;visibility:hidden;transform:scale(1.04);transition:opacity .9s ease,transform .9s ease,visibility .9s;display:flex;align-items:center;padding:104px 0 120px;overflow:hidden;}
.hs-slide.on{opacity:1;visibility:visible;transform:none;position:relative;}
.hs-b1{background:linear-gradient(150deg,#062d47 0%,#0a3d5e 55%,#12618f 100%);}
.hs-b2{background:linear-gradient(150deg,#05273f 0%,#0b3d60 50%,#0e6d8a 100%);}
.hs-b3{background:linear-gradient(150deg,#042338 0%,#0a4a52 55%,#12807c 100%);}
.hs-b4{background:linear-gradient(150deg,#062d47 0%,#11446b 52%,#1779ad 100%);}
.hs-slide::before{content:"";position:absolute;inset:0;background:radial-gradient(660px 360px at 88% -12%,rgba(34,199,192,.26),transparent 62%),radial-gradient(520px 320px at -6% 108%,rgba(23,121,173,.4),transparent 60%);}
.hs-bubble{position:absolute;border:1.6px solid rgba(255,255,255,.13);border-radius:50%;pointer-events:none;}
.hb1{width:190px;height:190px;top:12%;left:-70px;animation:float 9s ease-in-out infinite;}
.hb2{width:80px;height:80px;top:64%;left:34%;animation:float 7s ease-in-out infinite reverse;}
.hb3{width:240px;height:240px;bottom:-110px;right:-80px;animation:float 11s ease-in-out infinite;}
.hs-grid{position:relative;z-index:2;display:grid;grid-template-columns:1.04fr .96fr;gap:56px;align-items:center;}
.hs-copy .eyebrow{display:inline-flex;align-items:center;gap:10px;padding:8px 18px;border:1px solid rgba(91,216,208,.4);border-radius:999px;color:#5bd8d0;font-size:14px;letter-spacing:.08em;margin-bottom:26px;background:rgba(34,199,192,.08);}
.hs-copy h1{color:#fff;font-size:clamp(32px,4.2vw,54px);line-height:1.24;margin-bottom:20px;letter-spacing:.01em;}
.hs-copy h1 .hl{background:linear-gradient(120deg,#5bd8d0,#22c7c0);-webkit-background-clip:text;background-clip:text;-webkit-text-fill-color:transparent;}
.hs-copy .sub{color:rgba(255,255,255,.84);font-size:clamp(15.5px,1.45vw,18.5px);max-width:560px;margin-bottom:30px;}
.hs-copy .hs-tags{display:flex;gap:14px 24px;flex-wrap:wrap;margin-top:26px;}
.hs-copy .hs-tags span{display:inline-flex;align-items:center;gap:8px;color:rgba(255,255,255,.74);font-size:14px;}
.hs-copy .hs-tags svg{color:#5bd8d0;flex:none;}
.hs-media{position:relative;display:flex;align-items:center;justify-content:center;}
.hs-media img{max-height:min(430px,56vh);width:auto;border-radius:22px;box-shadow:0 26px 60px rgba(0,0,0,.32);}
.hs-media .ring{position:absolute;width:78%;aspect-ratio:1;border-radius:50%;border:1.5px dashed rgba(91,216,208,.3);animation:spin 46s linear infinite;}
@keyframes spin{to{transform:rotate(360deg)}}
.hs-arrow{position:absolute;top:50%;transform:translateY(-50%);z-index:5;width:46px;height:46px;border-radius:50%;display:flex;align-items:center;justify-content:center;background:rgba(255,255,255,.07);border:1px solid rgba(255,255,255,.22);color:#fff;transition:all .25s;}
.hs-arrow:hover{background:rgba(34,199,192,.35);border-color:rgba(91,216,208,.7);}
.hs-prev{left:18px;}
.hs-next{right:18px;}
.hs-dots{position:absolute;left:0;right:0;bottom:30px;z-index:6;display:flex;justify-content:center;gap:9px;}
.hs-dots button{width:9px;height:9px;border-radius:99px;background:rgba(255,255,255,.32);transition:all .3s ease;}
.hs-dots button.on{width:28px;background:linear-gradient(90deg,#5bd8d0,#22c7c0);}
@media(max-width:1024px){
  .hs-grid{grid-template-columns:1fr;gap:40px;}
  .hs-media{order:-1;}
  .hs-media img{max-height:250px;}
  .hs-slide{padding:88px 0 108px;}
}
@media(max-width:640px){
  .hs-slide{padding:70px 0 96px;}
  .hs-media img{max-height:200px;}
  .hs-arrow{display:none;}
  .hs-copy .hs-tags{gap:10px 14px;}
}
@media(min-width:1025px){ .hs-slide,.hs-slide.on{position:relative;} .hs-slide{position:absolute;} .hs-slide.on{position:relative;} }

/* =========================================================
   首页通用组件(品牌条/优势/系统卡)
   ========================================================= */
.stat-strip{display:grid;grid-template-columns:repeat(4,1fr);gap:26px;}
.stat{text-align:center;padding:10px 8px;}
.stat b{display:block;font-size:clamp(28px,3.2vw,42px);line-height:1.1;background:linear-gradient(120deg,var(--aqua-500),var(--brand-500));-webkit-background-clip:text;background-clip:text;-webkit-text-fill-color:transparent;font-weight:800;}
.stat span{display:block;margin-top:8px;color:var(--ink-600);font-size:14.5px;}
.badge-cn{display:inline-flex;align-items:center;gap:8px;background:#fff;border:1px solid var(--line);border-radius:999px;padding:9px 18px;font-size:14px;color:var(--brand-800);font-weight:600;box-shadow:var(--shadow-sm);}

.dual{display:grid;grid-template-columns:1fr 1.05fr;gap:64px;align-items:center;}
.dual-visual{position:relative;border-radius:22px;overflow:hidden;box-shadow:var(--shadow-lg);background:linear-gradient(150deg,var(--bg-50),#fff);}
.dual-visual img{width:100%;height:100%;object-fit:cover;display:block;}
.water-tower{display:flex;flex-direction:column;align-items:center;justify-content:center;gap:14px;padding:20px;}
.water-tower img{width:100%;max-height:560px;object-fit:contain;}

.sys-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:24px;}
.sys-card{position:relative;background:#fff;border:1px solid var(--line);border-radius:20px;overflow:hidden;transition:all .32s ease;display:flex;flex-direction:column;}
.sys-card:hover{transform:translateY(-6px);box-shadow:var(--shadow-lg);border-color:transparent;}
.sys-card .simg{aspect-ratio:16/11;overflow:hidden;background:linear-gradient(150deg,#eaf6fb,#d9edf5);}
.sys-card .simg img{width:100%;height:100%;object-fit:cover;object-position:center;transition:transform .5s ease;}
.sys-card:hover .simg img{transform:scale(1.06);}
.sys-card .sbody{padding:24px 24px 26px;display:flex;flex-direction:column;flex:1;}
.sys-card .sbody h3{font-size:19px;margin-bottom:8px;}
.sys-card .sbody p{font-size:14px;color:var(--ink-600);flex:1;}
.sys-card .stag{display:inline-flex;align-items:center;gap:6px;font-size:12px;font-weight:700;letter-spacing:.1em;color:var(--aqua-500);margin-bottom:12px;}
.sys-card .link{display:inline-flex;align-items:center;gap:6px;font-size:14.5px;font-weight:700;color:var(--aqua-500);margin-top:16px;}
.sys-card .link:hover{color:var(--brand-600);}

.point-list li{display:flex;gap:14px;padding:12px 0;border-bottom:1px dashed var(--line);align-items:flex-start;}
.point-list li:last-child{border-bottom:none;}
.point-list .pt-ic{width:40px;height:40px;flex:none;border-radius:12px;background:linear-gradient(135deg,var(--aqua-100),#eefbfa);display:flex;align-items:center;justify-content:center;color:var(--brand-700);}
.point-list b{font-size:16.5px;color:var(--brand-900);}
.point-list p{font-size:14px;color:var(--ink-600);margin-top:2px;}

.who-chips{display:flex;flex-wrap:wrap;gap:10px;margin-top:18px;}
.who-chips span{display:inline-flex;align-items:center;gap:7px;font-size:14px;font-weight:600;color:var(--brand-800);background:#fff;border:1px solid var(--line);border-radius:999px;padding:8px 15px;transition:all .22s;}
.who-chips span:hover{border-color:var(--aqua-400);color:var(--aqua-500);}
.compare{display:grid;grid-template-columns:1fr 1fr;gap:24px;}
.cmp{background:#fff;border:1px solid var(--line);border-radius:18px;padding:26px 24px;position:relative;overflow:hidden;}
.cmp::before{content:"";position:absolute;top:0;left:0;right:0;height:4px;}
.cmp.ok::before{background:linear-gradient(90deg,var(--aqua-400),var(--aqua-300));}
.cmp.no::before{background:linear-gradient(90deg,#b9c6cd,#97a9b3);}
.cmp h4{font-size:17px;margin-bottom:6px;}
.cmp .t{font-size:12.5px;color:var(--ink-400);margin-bottom:14px;letter-spacing:.04em;}
.cmp ul li{display:flex;gap:9px;font-size:13.8px;color:var(--ink-600);padding:5px 0;align-items:flex-start;}
.cmp ul svg{flex:none;margin-top:5px;}
.mk{display:inline-flex;padding:4px 12px;border-radius:999px;font-size:12.5px;font-weight:700;}
.mk-g{background:var(--aqua-100);color:var(--aqua-500);}
.mk-s{background:#eef1f3;color:#7c939f;}

@media(max-width:1024px){
  .dual{grid-template-columns:1fr;gap:40px;}
  .sys-grid{grid-template-columns:repeat(2,1fr);}
}
@media(max-width:820px){
  .stat-strip{grid-template-columns:repeat(2,1fr);gap:18px;}
  .compare{grid-template-columns:1fr;}
}
@media(max-width:600px){
  .sys-grid{grid-template-columns:1fr;}
}