:root{
  --blue:#4d6bfe;
  --blue-deep:#2f4be0;
  --blue-soft:#e9f0fe;
  --ink:#22315e;
  --body:#5a6a8a;
  --muted:#8a97b5;
  --line:#e3eaf6;
  --card:#ffffff;
  --tint:#f5f8fe;
  --gold:#f7b500;
  --green:#1fa856;
  --radius:24px;
  --shadow-sm:0 2px 10px rgba(46,74,144,.06);
  --shadow-md:0 14px 40px rgba(46,74,144,.12);
  --shadow-lg:0 24px 70px rgba(35,64,150,.16);
}
*{margin:0;padding:0;box-sizing:border-box}
html{scroll-behavior:smooth;-webkit-text-size-adjust:100%}
body{
  font-family:"PingFang SC","HarmonyOS Sans SC","Source Han Sans SC","Microsoft YaHei",system-ui,-apple-system,"Segoe UI",Roboto,sans-serif;
  color:var(--body);background:#fff;line-height:1.75;font-size:16px;
  -webkit-font-smoothing:antialiased;overflow-x:hidden;
}
img,svg{display:block}
a{color:inherit;text-decoration:none}
ul,ol{list-style:none}
button{font-family:inherit;cursor:pointer;border:none;background:none}
input,textarea{font-family:inherit}
section{scroll-margin-top:96px}
.container{width:min(1120px,calc(100% - 40px));margin:0 auto}
h1,h2,h3{color:var(--ink);font-weight:700;line-height:1.3}
::selection{background:rgba(77,107,254,.18)}

/* ---------- Reveal animation ---------- */
.js .reveal{opacity:0;transform:translateY(26px);transition:opacity .7s ease,transform .7s ease}
.js .reveal.in{opacity:1;transform:none}
.js .d1{transition-delay:.08s}.js .d2{transition-delay:.16s}.js .d3{transition-delay:.24s}
.js .d4{transition-delay:.32s}.js .d5{transition-delay:.4s}.js .d6{transition-delay:.48s}
@media (prefers-reduced-motion:reduce){
  html{scroll-behavior:auto}
  *,*::before,*::after{animation-duration:.001s!important;transition-duration:.001s!important}
  .js .reveal{opacity:1;transform:none}
}
@media print{
  .js .reveal{opacity:1!important;transform:none!important}
  .nav{position:static}
}

/* ---------- Buttons ---------- */
.btn{display:inline-flex;align-items:center;justify-content:center;gap:9px;
  padding:14px 26px;border-radius:999px;font-size:15.5px;font-weight:600;
  transition:transform .25s ease,box-shadow .25s ease,background .25s ease,color .25s ease;white-space:nowrap}
.btn svg{width:18px;height:18px;flex:none}
.btn-primary{background:var(--blue);color:#fff;box-shadow:0 10px 26px rgba(77,107,254,.35)}
.btn-primary:hover{background:var(--blue-deep);transform:translateY(-2px);box-shadow:0 14px 32px rgba(77,107,254,.42)}
.btn-ghost{background:rgba(255,255,255,.85);color:var(--ink);border:1px solid var(--line);box-shadow:var(--shadow-sm)}
.btn-ghost:hover{transform:translateY(-2px);box-shadow:var(--shadow-md);border-color:#c9d7f5}
.btn-white{background:#fff;color:var(--blue-deep);box-shadow:0 10px 30px rgba(20,40,120,.28)}
.btn-white:hover{transform:translateY(-2px);box-shadow:0 16px 40px rgba(20,40,120,.34)}
.btn-outline-white{background:rgba(255,255,255,.12);color:#fff;border:1px solid rgba(255,255,255,.55);backdrop-filter:blur(4px)}
.btn-outline-white:hover{background:rgba(255,255,255,.22);transform:translateY(-2px)}

/* ---------- Navigation ---------- */
.nav{position:fixed;top:16px;left:50%;transform:translateX(-50%);z-index:100;
  width:min(1120px,calc(100% - 28px));height:60px;
  display:flex;align-items:center;gap:28px;padding:0 10px 0 22px;
  background:transparent;border:1px solid transparent;border-radius:999px;
  box-shadow:none;
  transition:box-shadow .3s ease,background .3s ease,border-color .3s ease}
.nav.scrolled,.nav.open{background:rgba(255,255,255,.55);
  backdrop-filter:blur(20px) saturate(1.6);-webkit-backdrop-filter:blur(20px) saturate(1.6);
  border-color:rgba(255,255,255,.45);box-shadow:0 8px 32px rgba(46,74,144,.12),inset 0 1px 0 rgba(255,255,255,.65)}
.brand{display:flex;align-items:center;gap:10px;flex:none}
.brand-mark{width:34px;height:34px;border-radius:10px;background:transparent;
  display:flex;align-items:center;justify-content:center;overflow:hidden}
.brand-mark img{width:28px;height:28px;object-fit:contain}
.brand-name{font-size:18.5px;font-weight:700;color:var(--ink);letter-spacing:.01em}
.brand-name em{font-style:normal;color:var(--blue)}
.nav-links{display:flex;gap:6px;margin:0 auto}
.nav-links a{padding:8px 16px;border-radius:999px;font-size:14.5px;font-weight:500;color:#41507a;transition:color .2s,background .2s}
.nav-links a:hover{color:var(--blue);background:var(--blue-soft)}
.nav-links a[aria-current="page"]{color:var(--blue);background:var(--blue-soft);font-weight:600}
.nav-actions{display:flex;align-items:center;gap:10px;flex:none;margin-left:auto}
.btn-nav{padding:9px 20px;font-size:14px}
.menu-btn{display:none;width:40px;height:40px;border-radius:50%;align-items:center;justify-content:center;color:var(--ink)}
.menu-btn svg{width:21px;height:21px}
.mobile-menu{display:none}
.nav.open .mobile-menu{display:block;position:absolute;top:calc(100% + 10px);left:0;right:0;
  background:rgba(255,255,255,.72);backdrop-filter:blur(20px) saturate(1.5);-webkit-backdrop-filter:blur(20px) saturate(1.5);
  border:1px solid rgba(255,255,255,.6);border-radius:22px;box-shadow:var(--shadow-lg);
  padding:10px;animation:fadeDown .25s ease}
.mobile-menu a{display:block;padding:13px 18px;border-radius:14px;font-size:15px;font-weight:500;color:var(--ink)}
.mobile-menu a:hover{background:var(--tint);color:var(--blue)}
.mobile-menu a[aria-current="page"]{color:var(--blue);background:var(--blue-soft)}
.mobile-menu .mm-cta{margin-top:6px;background:var(--blue);color:#fff;text-align:center;font-weight:600}
.mobile-menu .mm-cta:hover{background:var(--blue-deep);color:#fff}
@keyframes fadeDown{from{opacity:0;transform:translateY(-8px)}to{opacity:1;transform:none}}

/* ---------- Hero（首页） ---------- */
.hero{position:relative;overflow:hidden;
  background:linear-gradient(180deg,#d5e3fa 0%,#e6eefc 42%,#f8fbff 78%,#fff 100%);
  /* 自适应三段居中：76px=导航占位；4 个 hero-sp 弹性等分（比例取自 950px 视口基准），
     视口更高时各带同步拉开，更矮/手机端 spacer 归零退化为紧凑流 */
  padding:76px 0 0;min-height:100vh;min-height:100svh;
  display:flex;flex-direction:column;text-align:center}
.hero .container{flex:1;display:flex;flex-direction:column}
.hero-sp{display:block;flex:1 1 0;min-height:0}
.hero-sp.sp-a,.hero-sp.sp-b{flex-grow:148}
.hero-sp.sp-c{flex-grow:120}
.hero-sp.sp-d{flex-grow:202}
.hero::before{content:"";position:absolute;inset:0;pointer-events:none;
  background-image:linear-gradient(rgba(77,107,254,.055) 1px,transparent 1px),
    linear-gradient(90deg,rgba(77,107,254,.055) 1px,transparent 1px);
  background-size:56px 56px;
  -webkit-mask-image:radial-gradient(62% 52% at 50% 26%,#000 0%,transparent 100%);
  mask-image:radial-gradient(62% 52% at 50% 26%,#000 0%,transparent 100%)}
.hero::after{content:"";position:absolute;left:50%;top:-230px;width:920px;height:540px;transform:translateX(-50%);pointer-events:none;
  background:radial-gradient(38% 55% at 30% 42%,rgba(77,107,254,.20),transparent 70%),
    radial-gradient(34% 50% at 68% 46%,rgba(56,189,248,.16),transparent 70%),
    radial-gradient(28% 44% at 50% 30%,rgba(167,139,250,.14),transparent 70%);
  filter:blur(12px);animation:aurora 15s ease-in-out infinite alternate}
@keyframes aurora{from{transform:translateX(-50%) translateY(0) scale(1)}to{transform:translateX(-53%) translateY(26px) scale(1.07)}}
.hero .container{position:relative}
.hero-dolphin{position:absolute;right:0;top:-40px;width:210px;height:210px;z-index:1}
.hero-dolphin img{width:100%;height:100%;object-fit:contain;
  filter:drop-shadow(0 18px 40px rgba(46,90,200,.22));
  animation:dolphin-bob 3.6s ease-in-out infinite}
/* 水帘涟漪：悬停海豚时双圈向外扩散（对齐登录页 AuthGate 的 dolphinRipple 行为） */
.hero-dolphin .dolphin-ripple{position:absolute;inset:8%;border-radius:50%;border:2px solid rgba(77,107,254,.32);
  opacity:0;pointer-events:none}
.hero-dolphin:hover .dolphin-ripple{animation:dolphin-ripple 2.4s ease-out infinite}
.hero-dolphin:hover .dolphin-ripple.dr2{animation-delay:1.2s}
@keyframes dolphin-bob{0%,100%{transform:translateY(0) rotate(0deg)}50%{transform:translateY(-6px) rotate(-1.5deg)}}
@keyframes dolphin-ripple{0%{transform:scale(.5);opacity:.5}100%{transform:scale(1.4);opacity:0}}
.announce{display:inline-flex;align-items:center;gap:8px;font-size:13.5px;color:#5a6c96;
  align-self:center;max-width:100%;
  padding:7px 18px;border-radius:999px;background:rgba(255,255,255,.28);border:1px solid rgba(255,255,255,.55);
  backdrop-filter:blur(14px) saturate(1.5);-webkit-backdrop-filter:blur(14px) saturate(1.5);
  box-shadow:0 8px 24px rgba(46,74,144,.10),inset 0 1px 0 rgba(255,255,255,.6);
  animation:rise .8s ease both}
.announce b{color:var(--blue);font-weight:600}
.announce:hover{background:rgba(255,255,255,.5)}
.hero h1{margin:26px auto 18px;font-size:clamp(1.95rem,4.9vw,3.35rem);font-weight:700;
  max-width:14em;letter-spacing:.05em;text-indent:.05em;color:#26355f;animation:rise .8s .1s ease both}
.hero-sub{max-width:620px;margin:0 auto 40px;font-size:clamp(15px,1.9vw,17.5px);color:#5c6c93;animation:rise .8s .2s ease both}
@keyframes rise{from{opacity:0;transform:translateY(22px)}to{opacity:1;transform:none}}

/* ---------- Page hero（子页头部） ---------- */
.page-hero{position:relative;overflow:hidden;text-align:center;
  background:linear-gradient(180deg,#d5e3fa 0%,#e6eefc 46%,#f8fbff 82%,#fff 100%);
  padding:150px 0 40px}
.page-hero::before{content:"";position:absolute;inset:0;pointer-events:none;
  background-image:linear-gradient(rgba(77,107,254,.055) 1px,transparent 1px),
    linear-gradient(90deg,rgba(77,107,254,.055) 1px,transparent 1px);
  background-size:56px 56px;
  -webkit-mask-image:radial-gradient(62% 60% at 50% 20%,#000 0%,transparent 100%);
  mask-image:radial-gradient(62% 60% at 50% 20%,#000 0%,transparent 100%)}
.page-hero::after{content:"";position:absolute;left:50%;top:-190px;width:780px;height:440px;transform:translateX(-50%);pointer-events:none;
  background:radial-gradient(38% 55% at 32% 42%,rgba(77,107,254,.17),transparent 70%),
    radial-gradient(32% 48% at 66% 46%,rgba(56,189,248,.13),transparent 70%);
  filter:blur(10px);animation:aurora 17s ease-in-out infinite alternate}
.page-hero .container{position:relative}
.page-hero .eyebrow{animation:rise .7s ease both}
.page-hero h1{margin:18px auto 12px;font-size:clamp(1.8rem,4.2vw,2.9rem);letter-spacing:.04em;color:#26355f;animation:rise .7s .08s ease both}
.page-hero .page-sub{max-width:640px;margin:0 auto;font-size:clamp(14.5px,1.8vw,16.5px);color:#5c6c93;animation:rise .7s .16s ease both}

/* ---------- Composer（首页演示输入框） ---------- */
.composer{width:min(860px,100%);margin:0 auto;text-align:left;border:1.5px solid transparent;
  background:linear-gradient(rgba(255,255,255,.55),rgba(255,255,255,.48)) padding-box,
    linear-gradient(135deg,rgba(77,107,254,.5),rgba(56,189,248,.42) 50%,rgba(167,139,250,.42)) border-box;
  backdrop-filter:blur(16px) saturate(1.45);-webkit-backdrop-filter:blur(16px) saturate(1.45);
  border-radius:26px;box-shadow:0 14px 44px rgba(46,74,144,.14);
  padding:18px 18px 14px;transition:box-shadow .25s;animation:rise .8s .28s ease both}
.composer:focus-within{box-shadow:0 18px 52px rgba(46,90,200,.2),0 0 0 4px rgba(77,107,254,.1)}
.composer textarea{width:100%;border:none;outline:none;resize:none;background:transparent;
  font-size:16.5px;color:var(--ink);line-height:1.6;padding:6px 6px 14px;min-height:64px}
.composer textarea::placeholder{color:#a6b2cc}
.composer-bar{display:flex;align-items:center;gap:10px;padding:0 2px}
.composer-chips{display:flex;gap:8px;flex-wrap:wrap}
.chip{display:inline-flex;align-items:center;gap:6px;padding:7px 14px;border-radius:999px;
  font-size:13.5px;font-weight:500;color:#66759a;background:#f1f5fc;border:1px solid transparent;
  transition:all .2s}
.chip svg{width:15px;height:15px}
.chip:hover{border-color:#c9d7f5;color:var(--blue)}
.chip.chip-on{background:var(--blue-soft);color:var(--blue);border-color:#c8d7fb}
.send-btn{margin-left:auto;width:46px;height:46px;border-radius:50%;flex:none;
  background:var(--blue);color:#fff;display:flex;align-items:center;justify-content:center;
  box-shadow:0 8px 20px rgba(77,107,254,.4);transition:transform .2s,background .2s}
.send-btn svg{width:20px;height:20px}
.send-btn:hover{background:var(--blue-deep);transform:translateY(-2px)}
.send-btn.busy{pointer-events:none;opacity:.75}
.demo-result{margin-top:14px;border-top:1px dashed #e2e9f7;padding-top:14px;text-align:left}
.demo-loading{display:flex;align-items:center;gap:10px;color:var(--blue);font-size:14px;font-weight:500;padding:6px 2px}
.spin{width:16px;height:16px;border-radius:50%;border:2px solid #cdd9fa;border-top-color:var(--blue);animation:spin .7s linear infinite;flex:none}
@keyframes spin{to{transform:rotate(360deg)}}
.demo-head{display:flex;align-items:center;gap:8px;font-size:14.5px;font-weight:600;color:var(--ink);padding:2px 2px 10px}
.demo-head svg{width:16px;height:16px;color:var(--blue);flex:none}
.demo-list li{display:flex;gap:12px;align-items:flex-start;padding:9px 10px;border-radius:14px;transition:background .2s}
.demo-list li:hover{background:#f6f9ff}
.demo-idx{flex:none;width:24px;height:24px;border-radius:8px;background:var(--blue-soft);color:var(--blue);
  font-size:12.5px;font-weight:700;display:flex;align-items:center;justify-content:center;margin-top:2px}
.demo-list b{display:block;font-size:14.5px;font-weight:600;color:#33415f}
.demo-list i{font-style:normal;font-size:12.5px;color:var(--muted)}
.demo-foot{display:flex;align-items:center;justify-content:space-between;gap:12px;flex-wrap:wrap;
  margin-top:10px;padding:12px 12px 4px;font-size:13px;color:var(--muted)}
.mini-cta{flex:none;display:inline-flex;align-items:center;gap:6px;background:var(--blue);color:#fff;
  font-size:13px;font-weight:600;padding:8px 16px;border-radius:999px;transition:background .2s,transform .2s}
.mini-cta:hover{background:var(--blue-deep);transform:translateY(-1px)}
.mini-cta svg{width:14px;height:14px}

.hero-ctas{display:flex;justify-content:center;gap:14px;flex-wrap:wrap;animation:rise .8s .36s ease both}
.trust{margin-top:34px;display:flex;justify-content:center;align-items:center;gap:18px;flex-wrap:wrap;
  font-size:13px;color:#6d7c9f;animation:rise .8s .44s ease both}
.trust .dot{width:3px;height:3px;border-radius:50%;background:#b6c1d9}

/* ---------- Stats ---------- */
.stats{background:#fff;padding:26px 0 10px}
.stats-grid{display:grid;grid-template-columns:repeat(4,1fr);border:1px solid rgba(227,234,246,.75);border-radius:22px;
  background:linear-gradient(rgba(255,255,255,.55),rgba(255,255,255,.45));backdrop-filter:blur(12px);-webkit-backdrop-filter:blur(12px);box-shadow:var(--shadow-sm);overflow:hidden;position:relative}
.stats-grid::before{content:"";position:absolute;top:0;left:12%;right:12%;height:1.5px;
  background:linear-gradient(90deg,transparent,rgba(77,107,254,.55),rgba(56,189,248,.45),transparent)}
.stat{padding:26px 12px;text-align:center;position:relative}
.stat + .stat::before{content:"";position:absolute;left:0;top:24%;height:52%;width:1px;background:var(--line)}
.stat b{display:block;font-size:clamp(1.5rem,3vw,2.1rem);font-weight:700;letter-spacing:.01em;
  background:linear-gradient(120deg,#3d5bef,#4d6bfe 45%,#38bdf8);-webkit-background-clip:text;background-clip:text;color:transparent}
.stat span{font-size:13px;color:var(--muted)}

/* ---------- Section header ---------- */
.sec{padding:92px 0}
.sec-head{text-align:center;max-width:680px;margin:0 auto 52px}
.eyebrow{display:inline-flex;align-items:center;gap:7px;font-size:13px;font-weight:600;color:var(--blue);
  background:var(--blue-soft);padding:6px 16px;border-radius:999px;letter-spacing:.06em}
.eyebrow::before{content:"";width:6px;height:6px;border-radius:50%;background:var(--blue);animation:pulse-dot 2.6s ease-in-out infinite}
@keyframes pulse-dot{0%,100%{box-shadow:0 0 0 0 rgba(77,107,254,.35)}55%{box-shadow:0 0 0 5px rgba(77,107,254,0)}}
.sec-head h2{margin:16px 0 12px;font-size:clamp(1.65rem,3.4vw,2.45rem);letter-spacing:.03em}
.sec-head p{font-size:15.5px;color:var(--body)}
.sec-tight{padding:64px 0 92px}

/* ---------- Features / cards ---------- */
.feature-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:18px}
.feature{position:relative;overflow:hidden;background:var(--card);border:1px solid var(--line);border-radius:var(--radius);padding:30px 26px;
  transition:transform .3s ease,box-shadow .3s ease,border-color .3s ease;display:block}
.feature::before{content:"";position:absolute;top:0;left:0;right:0;height:2px;
  background:linear-gradient(90deg,transparent,rgba(77,107,254,.55),rgba(56,189,248,.45),transparent);
  opacity:0;transition:opacity .3s}
.feature:hover::before{opacity:1}
a.feature:hover{transform:translateY(-5px);box-shadow:var(--shadow-md);border-color:#d4e0f8}
.feature:hover{transform:translateY(-5px);box-shadow:var(--shadow-md);border-color:#d4e0f8}
.feature-ico{width:48px;height:48px;border-radius:14px;background:var(--blue-soft);color:var(--blue);
  display:flex;align-items:center;justify-content:center;margin-bottom:18px}
.feature-ico svg{width:23px;height:23px}
.feature h3{font-size:17.5px;margin-bottom:8px}
.feature p{font-size:14px;color:var(--body)}
.feature .tool-tag{display:inline-block;margin-top:14px;font-size:12px;font-weight:600;color:#5a72b8;
  background:#f1f5fc;border-radius:8px;padding:3px 10px;font-family:ui-monospace,SFMono-Regular,Menlo,monospace}
.feature .more{display:inline-flex;align-items:center;gap:5px;margin-top:14px;font-size:13.5px;font-weight:600;color:var(--blue)}
.feature .more svg{width:14px;height:14px;transition:transform .2s}
.feature:hover .more svg{transform:translateX(3px)}

/* ---------- Homepage teaser ---------- */
.teaser-grid{display:grid;grid-template-columns:repeat(2,1fr);gap:18px}
.teaser h3{font-size:19px}
.teaser p{font-size:14.5px}

/* ---------- Showcase ---------- */
.showcase{background:linear-gradient(180deg,#f5f8fe 0%,#eef3fd 100%)}
.showcase-grid{display:grid;grid-template-columns:1.05fr .95fr;gap:56px;align-items:center}
.showcase-copy .eyebrow{margin-bottom:14px}
.showcase-copy h2{font-size:clamp(1.6rem,3.2vw,2.3rem);margin-bottom:14px}
.showcase-copy>p{font-size:15.5px;margin-bottom:26px}
.check-list li{display:flex;gap:12px;margin-bottom:16px;align-items:flex-start}
.check-list .ck{flex:none;width:22px;height:22px;border-radius:50%;background:#e4f7ec;color:var(--green);
  display:flex;align-items:center;justify-content:center;margin-top:3px}
.check-list .ck svg{width:12px;height:12px}
.check-list b{display:block;font-size:15.5px;color:var(--ink);font-weight:600}
.check-list span{font-size:13.5px;color:var(--body)}
.showcase-copy .btn{margin-top:12px}

/* Desk mockup */
.desk-wrap{position:relative;display:flex;justify-content:center;padding:16px 0}
.desk{width:100%;max-width:520px;background:#101c3f;border-radius:20px;padding:9px;box-shadow:var(--shadow-lg);position:relative}
.desk-bar{display:flex;align-items:center;gap:6px;padding:2px 8px 9px}
.desk-bar i{width:10px;height:10px;border-radius:50%;background:#3a4a75;display:block}
.desk-bar i:nth-child(1){background:#ff6058}.desk-bar i:nth-child(2){background:#ffbd2e}.desk-bar i:nth-child(3){background:#28c840}
.desk-bar span{margin-left:auto;font-size:10.5px;color:#7f8db5;font-family:ui-monospace,SFMono-Regular,Menlo,monospace}
.desk-screen{position:relative;background:linear-gradient(180deg,#f7faff,#eef3fd);border-radius:14px;overflow:hidden;padding:16px;min-height:400px}
.desk-screen::after{content:"";position:absolute;inset:0;pointer-events:none;
  background:linear-gradient(115deg,transparent 32%,rgba(77,107,254,.07) 46%,rgba(255,255,255,.35) 50%,rgba(77,107,254,.07) 54%,transparent 68%);
  background-size:260% 100%;animation:sheen 5.4s ease-in-out infinite}
@keyframes sheen{from{background-position:130% 0}to{background-position:-130% 0}}
.wk-chat{display:flex;flex-direction:column;gap:11px}
.wk-msg{display:flex;gap:9px;align-items:flex-start}
.wk-avatar{width:26px;height:26px;border-radius:8px;flex:none;display:flex;align-items:center;justify-content:center;
  font-size:11px;font-weight:700;color:#fff;background:linear-gradient(135deg,#7c95ff,#4d6bfe)}
.wk-avatar.bot{background:linear-gradient(135deg,#34c08b,#159a67)}
.wk-bubble{background:#fff;border:1px solid var(--line);border-radius:13px;padding:9px 13px;font-size:12.5px;color:#3d4b6b;
  box-shadow:var(--shadow-sm);line-height:1.6}
.wk-bubble code{font-family:ui-monospace,SFMono-Regular,Menlo,monospace;font-size:11.5px;color:var(--blue-deep);
  background:var(--blue-soft);border-radius:5px;padding:1px 5px}
.wk-cards{display:grid;grid-template-columns:1fr 1fr;gap:8px;margin-top:2px}
.wk-card{background:#fff;border:1px solid var(--line);border-radius:12px;padding:10px 12px;box-shadow:var(--shadow-sm)}
.wk-card em{display:block;font-style:normal;font-size:10.5px;color:var(--muted);margin-bottom:3px}
.wk-card b{font-size:13px;color:var(--ink)}
.wk-card.ok b{color:var(--green)}
.wk-steps{display:flex;gap:6px;flex-wrap:wrap;margin-top:3px}
.wk-steps span{font-size:10.5px;font-weight:600;color:#5a72b8;background:var(--blue-soft);
  border-radius:999px;padding:3px 10px}
.float-chip{position:absolute;background:rgba(255,255,255,.4);border:1px solid rgba(255,255,255,.75);border-radius:16px;
  backdrop-filter:blur(14px) saturate(1.5);-webkit-backdrop-filter:blur(14px) saturate(1.5);
  box-shadow:var(--shadow-md);padding:11px 16px;font-size:12.5px;font-weight:600;color:var(--ink);
  display:flex;gap:8px;align-items:center;animation:float 5.5s ease-in-out infinite;z-index:4}
.float-chip svg{width:16px;height:16px;color:var(--blue);flex:none}
.float-chip small{display:block;font-size:10.5px;font-weight:500;color:var(--muted)}
.fc-1{top:26px;left:-16px}
.fc-2{bottom:44px;right:-16px;animation-delay:2.6s}
@keyframes float{0%,100%{transform:translateY(0)}50%{transform:translateY(-9px)}}

/* ---------- Personas ---------- */
.persona-grid{display:grid;grid-template-columns:repeat(4,1fr);gap:16px}
.persona{background:#fff;border:1px solid var(--line);border-radius:20px;padding:24px 22px;
  transition:transform .3s,box-shadow .3s,border-color .3s}
.persona:hover{transform:translateY(-4px);box-shadow:var(--shadow-md);border-color:#d4e0f8}
.persona-ico{width:42px;height:42px;border-radius:12px;background:linear-gradient(135deg,#eef3ff,#dce8ff);
  display:flex;align-items:center;justify-content:center;margin-bottom:14px}
.persona-ico svg{width:21px;height:21px;color:var(--blue)}
.persona h3{font-size:16px;margin-bottom:5px}
.persona p{font-size:13px;color:var(--body);margin-bottom:12px}
.persona code{display:block;font-size:11.5px;color:#8a97b5;font-family:ui-monospace,SFMono-Regular,Menlo,monospace;
  background:#f7f9fd;border-radius:7px;padding:4px 9px}

/* ---------- Steps ---------- */
.steps-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:20px}
.step{position:relative;background:#fff;border:1px solid var(--line);border-radius:var(--radius);
  padding:34px 28px 30px;transition:transform .3s,box-shadow .3s}
.step:hover{transform:translateY(-5px);box-shadow:var(--shadow-md)}
.step-num{width:44px;height:44px;border-radius:14px;background:linear-gradient(135deg,#5f7bff,#3d5bef);
  color:#fff;font-size:17px;font-weight:700;display:flex;align-items:center;justify-content:center;
  margin-bottom:18px;box-shadow:0 8px 18px rgba(77,107,254,.3)}
.step h3{font-size:17.5px;margin-bottom:8px}
.step p{font-size:14px}
.step::after{content:"";position:absolute;top:56px;right:-14px;width:28px;height:1.5px;
  background:repeating-linear-gradient(90deg,#c6d3f2 0 4px,transparent 4px 8px)}
.step:last-child::after{display:none}

/* ---------- FAQ ---------- */
.faq{background:linear-gradient(180deg,#fff 0%,#f6f9fd 100%)}
.faq-list{max-width:760px;margin:0 auto}
.faq-item{background:rgba(255,255,255,.45);backdrop-filter:blur(10px);-webkit-backdrop-filter:blur(10px);border:1px solid rgba(227,234,246,.75);border-radius:18px;margin-bottom:12px;overflow:hidden;transition:border-color .25s,box-shadow .25s}
.faq-item[open]{border-color:#c8d7fb;box-shadow:var(--shadow-sm)}
.faq-item summary{list-style:none;display:flex;align-items:center;justify-content:space-between;gap:16px;
  padding:19px 24px;font-size:15.5px;font-weight:600;color:var(--ink);cursor:pointer;user-select:none}
.faq-item summary::-webkit-details-marker{display:none}
.faq-item summary:hover{color:var(--blue)}
.faq-item summary svg{width:18px;height:18px;color:var(--muted);flex:none;transition:transform .25s}
.faq-item[open] summary svg{transform:rotate(180deg);color:var(--blue)}
.faq-item p{padding:0 24px 20px;font-size:14.5px}
.faq-item code{font-family:ui-monospace,SFMono-Regular,Menlo,monospace;font-size:13px;color:var(--blue-deep);
  background:var(--blue-soft);border-radius:5px;padding:1px 6px}
.faq-cta{text-align:center;margin-top:34px;font-size:14px;color:var(--body)}
.faq-cta a{color:var(--blue);font-weight:600}
.faq-cta a:hover{text-decoration:underline}

/* ---------- Download page ---------- */
.dl-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:18px}
.dl-card{background:#fff;border:1px solid var(--line);border-radius:var(--radius);padding:34px 26px;text-align:center;
  transition:transform .3s,box-shadow .3s,border-color .3s;display:flex;flex-direction:column;align-items:center}
.dl-card:hover{transform:translateY(-5px);box-shadow:var(--shadow-md);border-color:#d4e0f8}
.dl-card .feature-ico{margin-bottom:16px}
.dl-card h3{font-size:18px;margin-bottom:6px}
.dl-card .dl-meta{font-size:13px;color:var(--muted);margin-bottom:20px}
.dl-card .btn{width:100%;justify-content:center;margin-top:auto}
.dl-req{max-width:680px;margin:26px auto 0;text-align:center;font-size:13.5px;color:var(--muted)}

/* ---------- Download band ---------- */
.band{position:relative;overflow:hidden;margin:0 0 0;background:linear-gradient(135deg,#4a66f5 0%,#6f8bff 55%,#8aa3ff 100%)}
.band::before{content:"";position:absolute;inset:0;
  background-image:radial-gradient(rgba(255,255,255,.16) 1.5px,transparent 1.5px);background-size:26px 26px;
  -webkit-mask-image:radial-gradient(70% 90% at 70% 10%,#000,transparent 75%);mask-image:radial-gradient(70% 90% at 70% 10%,#000,transparent 75%)}
.band-inner{position:relative;display:flex;align-items:center;justify-content:space-between;gap:44px;padding:78px 0}
.band-copy{color:#fff;max-width:600px}
.band-copy h2{color:#fff;font-size:clamp(1.7rem,3.6vw,2.5rem);letter-spacing:.04em;margin-bottom:14px}
.band-copy p{font-size:15.5px;color:rgba(255,255,255,.88);margin-bottom:30px}
.band-ctas{display:flex;gap:13px;flex-wrap:wrap}
.qr-card{flex:none;margin-right:150px;background:rgba(255,255,255,.58);backdrop-filter:blur(16px) saturate(1.4);-webkit-backdrop-filter:blur(16px) saturate(1.4);border:1px solid rgba(255,255,255,.6);border-radius:22px;padding:16px;text-align:center;box-shadow:0 20px 50px rgba(15,35,110,.3);position:relative;z-index:2}
.qr-card img{width:132px;height:132px;border-radius:8px}
.qr-card svg{width:132px;height:132px;border-radius:8px}
.qr-card p{font-size:12.5px;color:#3d4f7c;margin-top:8px;font-weight:500}
.band-dolphin{position:absolute;right:-20px;bottom:-30px;width:190px;height:190px;object-fit:contain;
  opacity:.85;pointer-events:none;filter:drop-shadow(0 16px 34px rgba(10,26,90,.35))}

/* ---------- Next CTA（子页底部引导） ---------- */
.next-cta{background:linear-gradient(180deg,#fff 0%,#f6f9fd 100%);text-align:center;padding:84px 0}
.next-cta h2{font-size:clamp(1.5rem,3vw,2.1rem);margin-bottom:12px}
.next-cta p{font-size:15px;color:var(--body);margin-bottom:28px}
.next-cta .btn-row{display:flex;justify-content:center;gap:13px;flex-wrap:wrap}

/* ---------- Footer ---------- */
footer{background:transparent;padding:56px 0 0}
.foot-grid{display:grid;grid-template-columns:1.5fr 1fr 1fr 1fr;gap:32px;padding-bottom:48px}
.foot-brand p{font-size:13.5px;color:var(--muted);margin-top:14px;max-width:280px}
.foot-col h4{font-size:14px;color:var(--ink);font-weight:700;margin-bottom:16px}
.foot-col a{display:block;font-size:13.5px;color:var(--body);padding:5px 0;transition:color .2s}
.foot-col a:hover{color:var(--blue)}
.foot-bottom{padding:18px 0 26px;display:flex;justify-content:space-between;align-items:center;gap:14px;flex-wrap:wrap;font-size:12.5px;color:var(--muted)}
.foot-slogan{font-weight:600;letter-spacing:.14em;
  background:linear-gradient(120deg,#3d5bef,#4d6bfe 45%,#38bdf8);-webkit-background-clip:text;background-clip:text;color:transparent}
.foot-bottom .links{display:flex;gap:20px}
.foot-bottom a:hover{color:var(--blue)}

/* ---------- Responsive ---------- */
@media (max-width:1020px){
  .showcase-grid{grid-template-columns:1fr;gap:44px}
  .showcase-copy{order:1}.desk-wrap{order:2}
  .feature-grid{grid-template-columns:repeat(2,1fr)}
  .persona-grid{grid-template-columns:repeat(2,1fr)}
  .dl-grid{grid-template-columns:repeat(2,1fr)}
  .foot-grid{grid-template-columns:1fr 1fr 1fr}
  .fc-1{left:2vw}.fc-2{right:2vw}
}
@media (max-width:820px){
  .nav-links{display:none}
  .nav .btn-nav{display:none}
  .menu-btn{display:flex}
  .hero{min-height:0;padding:116px 0 60px}
  .hero-sp{display:none}
  .composer{margin-top:100px}
  .hero-ctas{margin-top:44px}
  .hero h1{letter-spacing:.06em;text-indent:.06em}
  .hero-dolphin{display:none}
  .page-hero{padding:120px 0 32px}
  .steps-grid{grid-template-columns:1fr;max-width:520px;margin:0 auto}
  .step::after{display:none}
  .teaser-grid{grid-template-columns:1fr}
  .band-inner{flex-direction:column;text-align:center;padding:64px 0}
  .band-ctas{justify-content:center}
  .band-dolphin{display:none}
  .qr-card{margin-right:0}
  .stats-grid{grid-template-columns:repeat(2,1fr)}
  .stat:nth-child(3)::before{display:none}
  .stat:nth-child(n+3){border-top:1px solid var(--line)}
}
@media (max-width:560px){
  .sec{padding:64px 0}
  .feature-grid{grid-template-columns:1fr}
  .persona-grid{grid-template-columns:1fr}
  .dl-grid{grid-template-columns:1fr}
  .foot-grid{grid-template-columns:1fr 1fr}
  .hero-ctas .btn{width:100%;max-width:320px}
  .composer-bar{flex-wrap:wrap}
  .send-btn{width:42px;height:42px}
  .float-chip{display:none}
  .announce{font-size:12.5px;padding:6px 14px}
  .trust{gap:10px}
  .trust .dot{display:none}
}