/* ===== 设计变量 · 明亮科技薄荷色 ===== */
:root{
    --bg:#f4fbfa;
    --bg-2:#eafaf7;
    --surface:#ffffff;
    --surface-soft:rgba(255,255,255,.72);
    --surface-glass:rgba(255,255,255,.6);
    --ink:#0c1b2a;
    --ink-2:#2c4257;
    --ink-3:#5b7088;
    --muted:#8aa0b8;
    --line:rgba(13,45,58,.08);
    --line-strong:rgba(13,45,58,.14);
    --mint:#2DD4BF;
    --mint-2:#5EEAD4;
    --mint-deep:#0d9488;
    --cyan:#06b6d4;
    --blue:#3b82f6;
    --gold:#f59e0b;
    --grad:linear-gradient(135deg,#2DD4BF 0%,#06b6d4 55%,#3b82f6 100%);
    --grad-soft:linear-gradient(135deg,rgba(45,212,191,.16),rgba(59,130,246,.16));
    --shadow-sm:0 2px 10px rgba(13,45,58,.06);
    --shadow:0 12px 40px rgba(13,45,58,.08);
    --shadow-lg:0 24px 60px rgba(13,45,58,.12);
    --radius:18px;
    --radius-sm:12px;
    --radius-lg:28px;
    --container:1200px;
    --ease:cubic-bezier(.22,.61,.36,1);
    --ease-out:cubic-bezier(.16,1,.3,1);
    --t-fast:.2s var(--ease);
    --t:.38s var(--ease);
    --t-slow:.6s var(--ease-out);
    --font:'Sora','Noto Sans SC',system-ui,-apple-system,sans-serif;
    --mono:'JetBrains Mono',monospace;
}

*,*::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);
    background:var(--bg);
    line-height:1.65;
    overflow-x:hidden;
    -webkit-font-smoothing:antialiased;
    text-rendering:optimizeLegibility;
}
img{max-width:100%;display:block}
a{color:inherit;text-decoration:none}
button{font-family:inherit;cursor:pointer;border:none;background:none}
input,textarea{font-family:inherit}
::selection{background:rgba(45,212,191,.25);color:var(--ink)}

/* ===== 背景装饰 ===== */
.bg-grid{
    position:fixed;inset:0;z-index:-3;
    background-image:
        linear-gradient(var(--line) 1px,transparent 1px),
        linear-gradient(90deg,var(--line) 1px,transparent 1px);
    background-size:48px 48px;
    mask-image:radial-gradient(ellipse 80% 60% at 50% 0%,#000 30%,transparent 75%);
    -webkit-mask-image:radial-gradient(ellipse 80% 60% at 50% 0%,#000 30%,transparent 75%);
    opacity:.7;
}
.bg-glow{
    position:fixed;z-index:-2;border-radius:50%;filter:blur(80px);
    pointer-events:none;will-change:transform;
}
.glow-a{width:520px;height:520px;top:-160px;right:-120px;
    background:radial-gradient(circle,rgba(45,212,191,.32),transparent 60%);
    animation:floatGlow 14s var(--ease) infinite alternate;}
.glow-b{width:600px;height:600px;top:240px;left:-200px;
    background:radial-gradient(circle,rgba(59,130,246,.22),transparent 60%);
    animation:floatGlow 18s var(--ease) infinite alternate-reverse;}
@keyframes floatGlow{
    0%{transform:translate(0,0) scale(1)}
    100%{transform:translate(40px,30px) scale(1.08)}
}
@media (prefers-reduced-motion:reduce){
    .bg-glow{animation:none}
}

/* ===== 按钮 ===== */
.btn{
    display:inline-flex;align-items:center;justify-content:center;gap:8px;
    font-weight:600;font-size:14px;letter-spacing:.01em;
    padding:11px 20px;border-radius:999px;
    transition:transform var(--t-fast),box-shadow var(--t-fast),background var(--t-fast),color var(--t-fast);
    white-space:nowrap;user-select:none;
}
.btn-lg{padding:15px 30px;font-size:15px}
.btn-sm{padding:8px 16px;font-size:13px}
.btn-block{width:100%}
.btn-primary{
    background:var(--grad);color:#fff;
    box-shadow:0 8px 24px rgba(45,212,191,.36),inset 0 1px 0 rgba(255,255,255,.3);
}
.btn-primary:hover{transform:translateY(-2px);box-shadow:0 14px 32px rgba(45,212,191,.48)}
.btn-primary:active{transform:translateY(0)}
.btn-ghost{
    background:var(--surface-soft);color:var(--ink-2);
    border:1px solid var(--line-strong);
    backdrop-filter:blur(10px);
}
.btn-ghost:hover{border-color:var(--mint);color:var(--mint-deep);background:#fff}
.btn-loader{
    display:none;width:16px;height:16px;border:2px solid rgba(255,255,255,.4);
    border-top-color:#fff;border-radius:50%;animation:spin .7s linear infinite;
}
.btn.is-loading .btn-text{opacity:.6}
.btn.is-loading .btn-loader{display:inline-block}
@keyframes spin{to{transform:rotate(360deg)}}

/* ===== 导航 ===== */
.nav{
    position:fixed;top:0;left:0;right:0;z-index:100;
    transition:background var(--t),box-shadow var(--t),border-color var(--t);
    border-bottom:1px solid transparent;
}
.nav.scrolled{
    background:var(--surface-glass);
    backdrop-filter:blur(18px) saturate(1.4);
    -webkit-backdrop-filter:blur(18px) saturate(1.4);
    border-bottom-color:var(--line);
    box-shadow:var(--shadow-sm);
}
.nav-inner{
    max-width:var(--container);margin:0 auto;padding:14px 28px;
    display:flex;align-items:center;gap:24px;
}
.brand{display:flex;align-items:center;gap:12px}
.brand-logo{
    width:40px;height:40px;border-radius:12px;object-fit:cover;
    box-shadow:var(--shadow-sm);border:1px solid var(--line);
}
.brand-text{display:flex;flex-direction:column;line-height:1.1}
.brand-zh{font-weight:700;font-size:16px;color:var(--ink)}
.brand-en{font-family:var(--mono);font-size:11px;color:var(--mint-deep);letter-spacing:.04em}
.nav-links{display:flex;gap:4px;margin-left:auto;margin-right:8px}
.nav-links a{
    padding:8px 14px;border-radius:999px;font-size:14px;color:var(--ink-2);
    transition:color var(--t-fast),background var(--t-fast);
}
.nav-links a:hover{color:var(--mint-deep);background:rgba(45,212,191,.1)}
.nav-actions{display:flex;gap:10px;margin-left:auto}
.nav-toggle{
    display:none;flex-direction:column;gap:5px;padding:8px;margin-left:auto;
}
.nav-toggle span{width:22px;height:2px;background:var(--ink-2);border-radius:2px;transition:transform var(--t),opacity var(--t-fast)}
.nav-toggle.active span:nth-child(1){transform:translateY(7px) rotate(45deg)}
.nav-toggle.active span:nth-child(2){opacity:0}
.nav-toggle.active span:nth-child(3){transform:translateY(-7px) rotate(-45deg)}
.nav-mobile{
    display:none;flex-direction:column;gap:4px;padding:0 28px 16px;
    max-height:0;overflow:hidden;transition:max-height var(--t),padding var(--t);
}
.nav-mobile.open{max-height:420px;padding:0 28px 20px}
.nav-mobile a{
    padding:12px 14px;border-radius:12px;color:var(--ink-2);font-weight:500;
    border-bottom:1px solid var(--line);
}
.nav-mobile a:last-of-type{border-bottom:none}
.nav-mobile .btn{margin-top:8px}

/* ===== Hero ===== */
.hero{
    position:relative;padding:140px 28px 80px;
    max-width:var(--container);margin:0 auto;
    overflow:hidden;
}
.hero-badge{
    display:inline-flex;align-items:center;gap:8px;
    padding:7px 16px;border-radius:999px;font-size:13px;font-weight:500;
    color:var(--mint-deep);
    background:rgba(45,212,191,.1);border:1px solid rgba(45,212,191,.25);
    backdrop-filter:blur(10px);
    animation:badgeIn .8s var(--ease-out) both;
}
.hero-badge .dot{
    width:7px;height:7px;border-radius:50%;background:var(--mint);
    box-shadow:0 0 0 0 rgba(45,212,191,.5);animation:pulse 2s infinite;
}
@keyframes pulse{
    0%{box-shadow:0 0 0 0 rgba(45,212,191,.5)}
    70%{box-shadow:0 0 0 8px rgba(45,212,191,0)}
    100%{box-shadow:0 0 0 0 rgba(45,212,191,0)}
}
@keyframes badgeIn{from{opacity:0;transform:translateY(-8px)}to{opacity:1;transform:none}}
.hero-grid{
    display:grid;grid-template-columns:1.05fr .95fr;gap:60px;align-items:center;
    margin-top:32px;
}
.hero-title{
    font-size:clamp(34px,5vw,58px);line-height:1.08;font-weight:800;
    letter-spacing:-.02em;color:var(--ink);
    animation:heroIn .9s var(--ease-out) both;
}
.grad-text{
    background:var(--grad);-webkit-background-clip:text;background-clip:text;
    -webkit-text-fill-color:transparent;color:transparent;
}
.hero-sub{
    margin-top:22px;font-size:clamp(15px,1.6vw,18px);color:var(--ink-3);
    max-width:560px;animation:heroIn 1s var(--ease-out) .1s both;
}
.hero-sub strong{color:var(--mint-deep);font-weight:600}
.hero-cta{display:flex;gap:14px;margin-top:34px;flex-wrap:wrap;animation:heroIn 1s var(--ease-out) .2s both}
@keyframes heroIn{from{opacity:0;transform:translateY(24px)}to{opacity:1;transform:none}}
.hero-meta{
    display:flex;align-items:center;gap:24px;margin-top:48px;
    animation:heroIn 1s var(--ease-out) .3s both;
}
.meta-item{display:flex;flex-direction:column;line-height:1.2}
.meta-num{font-family:var(--mono);font-size:26px;font-weight:700;color:var(--ink)}
.meta-plus{display:inline;color:var(--mint-deep);font-weight:700;font-size:18px;margin-left:2px}
.meta-label{font-size:12px;color:var(--muted);margin-top:4px;letter-spacing:.02em}
.meta-sep{width:1px;height:36px;background:var(--line-strong)}

/* Hero 视觉 */
.hero-visual{position:relative;display:flex;justify-content:center;animation:heroIn 1.1s var(--ease-out) .25s both}
.phone-frame{
    width:300px;height:600px;border-radius:42px;
    background:linear-gradient(160deg,#0f172a,#1e293b);
    padding:14px 12px 22px;position:relative;
    box-shadow:0 40px 80px rgba(13,45,58,.25),0 0 0 2px rgba(255,255,255,.05),inset 0 2px 0 rgba(255,255,255,.08);
}
/* 灵动岛 Dynamic Island */
.phone-dynamic-island{
    position:absolute;top:11px;left:50%;transform:translateX(-50%);
    height:32px;min-width:108px;padding:0 16px;z-index:5;
    background:#000;border-radius:999px;
    display:flex;align-items:center;justify-content:center;gap:7px;
    box-shadow:0 2px 10px rgba(0,0,0,.35),inset 0 1px 0 rgba(255,255,255,.08);
    transition:min-width .35s var(--ease-out),background .35s var(--ease-out);
}
.island-dot{
    width:8px;height:8px;border-radius:50%;background:#26d07c;
    box-shadow:0 0 0 2px rgba(38,208,124,.3);animation:pulse 2s infinite;
    flex:0 0 8px;
}
.island-time{font-family:var(--mono);font-size:13px;font-weight:600;color:#fff;letter-spacing:.02em;line-height:1;transition:max-width .35s var(--ease-out),opacity .25s var(--ease-out),margin .35s var(--ease-out);max-width:60px;overflow:hidden;white-space:nowrap}
.island-extra{
    display:flex;align-items:center;gap:6px;overflow:hidden;
    max-width:0;opacity:0;
    transition:max-width .42s var(--ease-out),opacity .3s var(--ease-out);
}
.island-ico{font-size:13px;line-height:1;flex:0 0 13px}
.island-msg{font-size:12.5px;font-weight:600;color:#fff;white-space:nowrap;line-height:1}
.phone-dynamic-island.is-active{min-width:128px;background:#0a0a0a}
/* 灵动岛展开态（充值/支付提示） */
.phone-dynamic-island.is-expanded{
    min-width:172px;background:#0a0a0a;
    box-shadow:0 4px 18px rgba(45,212,191,.25),0 2px 10px rgba(0,0,0,.4);
}
.phone-dynamic-island.is-expanded .island-time{max-width:0;opacity:0;margin:0}
.phone-dynamic-island.is-expanded .island-extra{max-width:160px;opacity:1}
.phone-dynamic-island.is-expanded .island-dot{background:#3b82f6;box-shadow:0 0 0 2px rgba(59,130,246,.3)}
.phone-dynamic-island.is-success .island-dot{background:#26d07c;box-shadow:0 0 0 3px rgba(38,208,124,.35);animation:islandPop .5s var(--ease-out)}
@keyframes islandPop{0%{transform:scale(1)}40%{transform:scale(1.4)}100%{transform:scale(1)}}
.phone-screen{
    width:100%;height:100%;border-radius:32px;overflow:hidden;
    display:flex;flex-direction:column;
    animation:phoneFloat 6s var(--ease) infinite alternate;
}
@keyframes phoneFloat{from{transform:translateY(0)}to{transform:translateY(-8px)}}

/* Telegram 聊天界面 */
.tg-screen{
    background:linear-gradient(180deg,#eafaf7 0%,#dff2fb 100%);
    color:#1e293b;padding-top:50px;position:relative;
}
.tg-header{
    display:flex;align-items:center;gap:10px;padding:6px 14px 10px;
    background:rgba(255,255,255,.92);backdrop-filter:blur(10px);
    border-bottom:1px solid rgba(13,45,58,.08);position:relative;z-index:2;
}
.tg-back,.tg-menu{width:32px;height:32px;border-radius:50%;display:flex;align-items:center;justify-content:center;color:#5b7088;background:transparent;transition:background var(--t-fast)}
.tg-back:hover,.tg-menu:hover{background:rgba(45,212,191,.14);color:var(--mint-deep)}
.tg-avatar{width:38px;height:38px;border-radius:50%;background:var(--grad);box-shadow:0 0 0 2px rgba(45,212,191,.25);flex:0 0 38px;position:relative;overflow:hidden}
.tg-avatar img{width:100%;height:100%;border-radius:50%;object-fit:cover;position:absolute;inset:0;display:block}
.tg-meta{flex:1;line-height:1.2;min-width:0}
.tg-name{font-size:14.5px;font-weight:700;color:#0f172a;white-space:nowrap;overflow:hidden;text-overflow:ellipsis}
.tg-status{font-size:11px;color:#5b7088;margin-top:2px;display:flex;align-items:center;gap:5px}
.tg-dot{width:7px;height:7px;border-radius:50%;background:#26d07c;box-shadow:0 0 0 2px rgba(38,208,124,.25)}

.tg-chat{
    flex:1;overflow-x:hidden;overflow-y:auto;padding:12px 10px;display:flex;flex-direction:column;gap:8px;
    position:relative;min-height:0;scroll-behavior:smooth;
}
.tg-chat::-webkit-scrollbar{width:3px}
.tg-chat::-webkit-scrollbar-thumb{background:rgba(45,212,191,.25);border-radius:2px}
.tg-chat::-webkit-scrollbar-track{background:transparent}
.tg-chat::before{
    content:'';position:absolute;inset:0;pointer-events:none;
    background:radial-gradient(circle at 18% 8%,rgba(45,212,191,.1),transparent 45%),radial-gradient(circle at 85% 90%,rgba(59,130,246,.07),transparent 45%);
}
.tg-chat>*{position:relative;z-index:1}
.tg-time{
    align-self:center;font-size:10.5px;color:#5b7088;
    background:rgba(255,255,255,.7);border-radius:999px;padding:3px 12px;margin-bottom:2px;
}
.tg-msg{display:flex;max-width:86%;animation:msgIn .4s var(--ease-out) both}
.tg-bot{justify-content:flex-start}
.tg-user{justify-content:flex-end;margin-left:auto}
@keyframes msgIn{from{opacity:0;transform:translateY(6px)}to{opacity:1;transform:none}}
.tg-bubble{
    padding:8px 12px;font-size:12.5px;line-height:1.55;border-radius:15px;
    box-shadow:0 1px 3px rgba(13,45,58,.08);word-break:break-word;
}
.tg-bubble b{font-weight:700}
.tg-bubble-bot{background:#fff;color:#1e293b;border-bottom-left-radius:5px}
.tg-bubble-user{background:linear-gradient(135deg,#2DD4BF,#06b6d4);color:#fff;border-bottom-right-radius:5px}

.tg-bubble-receipt{padding:11px 12px;border:1px solid rgba(45,212,191,.22);background:#fff}
.tg-receipt-title{font-size:13px;font-weight:700;color:#0f172a;margin-bottom:7px}
.tg-receipt-row{display:flex;justify-content:space-between;align-items:center;font-size:11.5px;color:#5b7088;padding:2px 0}
.tg-receipt-row .mono{font-family:var(--mono);color:#0f172a;font-weight:600}
.tg-pay-btn{
    margin-top:9px;width:100%;padding:8px;border-radius:11px;
    background:linear-gradient(135deg,#26d07c,#16a34a);color:#fff;
    font-size:12.5px;font-weight:600;cursor:pointer;transition:transform var(--t-fast)}
.tg-pay-btn:hover{transform:translateY(-1px)}
.tg-receipt-tip{margin-top:5px;font-size:10px;color:#8aa0b8;text-align:center}

/* inline 主菜单键盘 */
.tg-keyboard{
    padding:8px 8px 12px;background:rgba(255,255,255,.55);backdrop-filter:blur(6px);
    border-top:1px solid rgba(13,45,58,.06);display:flex;flex-direction:column;gap:5px;
    max-height:208px;overflow-y:auto;
}
.tg-keyboard::-webkit-scrollbar{width:3px}
.tg-keyboard::-webkit-scrollbar-thumb{background:rgba(45,212,191,.35);border-radius:2px}
.tg-keyboard::-webkit-scrollbar-track{background:transparent}
.tg-key-row{display:grid;grid-template-columns:1fr 1fr;gap:5px}
.tg-key{
    padding:8px 6px;border-radius:11px;border:1px solid rgba(13,45,58,.08);
    background:#fff;color:#2c4257;font-size:11.5px;font-weight:500;cursor:pointer;
    transition:background var(--t-fast),border-color var(--t-fast),transform .15s var(--ease);
    line-height:1.3;text-align:center;
}
.tg-key:hover{background:rgba(45,212,191,.12);border-color:rgba(45,212,191,.35);color:var(--mint-deep)}
.tg-key:active{transform:scale(.97)}
.tg-key-wide{grid-column:1/-1}

.float-chip{
    position:absolute;display:flex;align-items:center;gap:8px;
    padding:10px 16px;border-radius:14px;font-size:13px;font-weight:600;
    background:var(--surface-glass);backdrop-filter:blur(14px);
    border:1px solid var(--line-strong);color:var(--ink-2);
    box-shadow:var(--shadow-sm);white-space:nowrap;
}
.chip-a{top:60px;left:-10px;animation:chipFloat 5s var(--ease) infinite alternate}
.chip-b{bottom:140px;left:-30px;animation:chipFloat 6s var(--ease) .5s infinite alternate-reverse}
.chip-c{top:280px;right:-20px;animation:chipFloat 7s var(--ease) 1s infinite alternate}
@keyframes chipFloat{from{transform:translateY(0)}to{transform:translateY(-12px)}}
.chip-ico{font-size:16px}

.hero-wave{position:absolute;bottom:-1px;left:0;right:0;line-height:0}
.hero-wave svg{width:100%;height:120px;display:block}
.hero-wave path{fill:var(--bg)}

/* ===== 通用 Section ===== */
.section{max-width:var(--container);margin:0 auto;padding:90px 28px}
.section-alt{background:linear-gradient(180deg,transparent,rgba(45,212,191,.05) 20%,rgba(45,212,191,.05) 80%,transparent);border-radius:var(--radius-lg)}
.section-head{max-width:720px;margin:0 auto 56px;text-align:center}
.eyebrow{
    display:inline-block;font-family:var(--mono);font-size:12px;font-weight:600;
    letter-spacing:.18em;color:var(--mint-deep);
    padding:6px 14px;border-radius:999px;background:rgba(45,212,191,.1);
    margin-bottom:18px;
}
.section-title{font-size:clamp(26px,3.6vw,38px);font-weight:800;letter-spacing:-.02em;color:var(--ink);line-height:1.2}
.section-sub{margin-top:16px;font-size:16px;color:var(--ink-3);line-height:1.7}

/* 特性卡片 */
.feature-grid{
    display:grid;grid-template-columns:repeat(3,1fr);gap:22px;
}
.feature-card{
    position:relative;padding:30px 28px;border-radius:var(--radius);
    background:var(--surface);border:1px solid var(--line);
    box-shadow:var(--shadow-sm);
    transition:transform var(--t),box-shadow var(--t),border-color var(--t);
    overflow:hidden;
}
.feature-card::before{
    content:'';position:absolute;inset:0;border-radius:inherit;
    background:var(--grad-soft);opacity:0;transition:opacity var(--t);
}
.feature-card>*{position:relative;z-index:1}
.feature-card:hover{transform:translateY(-6px);box-shadow:var(--shadow);border-color:rgba(45,212,191,.3)}
.feature-card:hover::before{opacity:1}
.feature-card-accent{background:linear-gradient(160deg,#fff,rgba(45,212,191,.08));border-color:rgba(45,212,191,.25)}
.feature-ico{
    width:54px;height:54px;border-radius:14px;display:flex;align-items:center;justify-content:center;
    color:#fff;margin-bottom:20px;
    box-shadow:0 8px 18px rgba(45,212,191,.3);
}
.ico-1{background:linear-gradient(135deg,#2DD4BF,#0d9488)}
.ico-2{background:linear-gradient(135deg,#06b6d4,#0e7490)}
.ico-3{background:linear-gradient(135deg,#3b82f6,#1d4ed8)}
.ico-4{background:linear-gradient(135deg,#f59e0b,#d97706)}
.ico-5{background:linear-gradient(135deg,#2DD4BF,#3b82f6)}
.ico-6{background:linear-gradient(135deg,#06b6d4,#2DD4BF)}
.feature-card h3{font-size:19px;font-weight:700;color:var(--ink);margin-bottom:10px}
.feature-card p{font-size:14.5px;color:var(--ink-3);line-height:1.7}

/* 币种卡片 */
.coin-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:24px}
.coin-card{
    padding:30px 26px;border-radius:var(--radius);
    background:var(--surface);border:1px solid var(--line);
    box-shadow:var(--shadow-sm);
    transition:transform var(--t),box-shadow var(--t);
    display:flex;flex-direction:column;gap:20px;
}
.coin-card:hover{transform:translateY(-6px);box-shadow:var(--shadow)}
.coin-card-accent{background:linear-gradient(160deg,#fff,rgba(6,182,212,.06));border-color:rgba(6,182,212,.25)}
.coin-head{display:flex;align-items:center;gap:14px}
.coin-emblem{
    width:54px;height:54px;border-radius:16px;display:flex;align-items:center;justify-content:center;
    font-size:26px;font-weight:800;color:#fff;box-shadow:0 8px 18px rgba(13,45,58,.12);
}
.usdt-emblem{background:linear-gradient(135deg,#26d07c,#1a9a5d)}
.trx-emblem{background:linear-gradient(135deg,#ff5b8a,#eb1450)}
.cny-emblem{background:linear-gradient(135deg,#2DD4BF,#0d9488)}
.coin-name{font-size:18px;font-weight:700;color:var(--ink)}
.coin-ticker{font-family:var(--mono);font-size:12px;color:var(--mint-deep);margin-top:2px;letter-spacing:.03em}
.coin-rate{display:flex;align-items:baseline;justify-content:space-between;padding:14px 16px;border-radius:var(--radius-sm);background:rgba(45,212,191,.06)}
.rate-label{font-size:12px;color:var(--muted);letter-spacing:.03em}
.rate-value{font-family:var(--mono);font-size:18px;font-weight:700;color:var(--ink)}
.coin-feats{list-style:none;display:flex;flex-direction:column;gap:10px}
.coin-feats li{position:relative;padding-left:24px;font-size:14px;color:var(--ink-2);line-height:1.6}
.coin-feats li::before{content:'';position:absolute;left:0;top:8px;width:8px;height:8px;border-radius:50%;background:var(--grad);box-shadow:0 0 0 3px rgba(45,212,191,.15)}

/* 步骤 */
.steps{display:flex;align-items:stretch;gap:16px;justify-content:center}
.step{flex:1;max-width:340px;padding:32px 28px;border-radius:var(--radius);background:var(--surface);border:1px solid var(--line);box-shadow:var(--shadow-sm);position:relative}
.step-num{font-family:var(--mono);font-size:42px;font-weight:700;color:var(--mint);opacity:.3;margin-bottom:8px}
.step-body h3{font-size:20px;font-weight:700;color:var(--ink);margin-bottom:8px}
.step-body p{font-size:14.5px;color:var(--ink-3);line-height:1.7}
.step-connector{flex:0 0 60px;display:flex;align-items:center;justify-content:center}
.step-connector::before{content:'';width:100%;height:2px;background:linear-gradient(90deg,var(--mint),var(--cyan));border-radius:2px;opacity:.4}

/* 安全 */
.section-security{padding:90px 28px}
.security-grid{display:grid;grid-template-columns:1fr 1fr;gap:60px;align-items:center}
.security-list{list-style:none;display:flex;flex-direction:column;gap:22px;margin-top:28px}
.security-list li{display:flex;gap:14px;align-items:flex-start}
.sec-dot{flex:0 0 12px;width:12px;height:12px;border-radius:50%;margin-top:5px;background:var(--grad);box-shadow:0 0 0 4px rgba(45,212,191,.15)}
.security-list strong{display:block;font-size:16px;font-weight:700;color:var(--ink);margin-bottom:4px}
.security-list p{font-size:14px;color:var(--ink-3);line-height:1.65}
.security-right{display:flex;justify-content:center}
.sec-visual{position:relative;width:380px;height:380px;display:flex;align-items:center;justify-content:center}
.ring{position:absolute;border-radius:50%;border:1.5px dashed rgba(45,212,191,.3);animation:ringRot 30s linear infinite}
.ring-1{width:380px;height:380px;animation-duration:40s}
.ring-2{width:280px;height:280px;border-style:solid;border-color:rgba(6,182,212,.2);animation-duration:25s;animation-direction:reverse}
.ring-3{width:180px;height:180px;border-color:rgba(59,130,246,.25);animation-duration:18s}
@keyframes ringRot{from{transform:rotate(0)}to{transform:rotate(360deg)}}
.ring-core{
    width:120px;height:120px;border-radius:32px;
    background:var(--grad);color:#fff;display:flex;align-items:center;justify-content:center;
    box-shadow:0 20px 40px rgba(45,212,191,.4);
}
.ring-label{
    position:absolute;padding:6px 14px;border-radius:999px;font-size:12px;font-weight:600;
    background:var(--surface);border:1px solid var(--line-strong);color:var(--ink-2);box-shadow:var(--shadow-sm);
}
.label-1{top:20px;right:30px;animation:labelFloat 4s var(--ease) infinite alternate}
.label-2{bottom:40px;left:20px;animation:labelFloat 5s var(--ease) .8s infinite alternate-reverse}
.label-3{top:160px;left:-10px;animation:labelFloat 6s var(--ease) 1.2s infinite alternate}
@keyframes labelFloat{from{transform:translateY(0)}to{transform:translateY(-8px)}}

/* 统计 */
.stats-grid{display:grid;grid-template-columns:repeat(4,1fr);gap:20px}
.stat-card{padding:32px 24px;border-radius:var(--radius);background:var(--surface);border:1px solid var(--line);box-shadow:var(--shadow-sm);text-align:center;transition:transform var(--t),box-shadow var(--t)}
.stat-card:hover{transform:translateY(-4px);box-shadow:var(--shadow)}
.stat-num{font-family:var(--mono);font-size:34px;font-weight:700;color:var(--ink);letter-spacing:-.02em}
.stat-num::after{content:attr(data-suffix);color:var(--mint-deep);font-size:.7em;margin-left:2px}
.stat-label{margin-top:8px;font-size:13px;color:var(--muted);letter-spacing:.02em}

/* 联系 */
.section-contact{padding:90px 28px}
.contact-card{
    display:grid;grid-template-columns:1fr 1.1fr;gap:0;
    border-radius:var(--radius-lg);overflow:hidden;
    background:var(--surface);border:1px solid var(--line);
    box-shadow:var(--shadow-lg);
}
.contact-left{padding:48px 44px;background:linear-gradient(160deg,rgba(45,212,191,.08),rgba(59,130,246,.05))}
.contact-left .section-title{text-align:left}
.contact-left .section-sub{margin-top:14px}
.contact-list{list-style:none;margin-top:28px;display:flex;flex-direction:column;gap:12px}
.contact-list li{display:flex;align-items:center;gap:12px;font-size:14.5px;color:var(--ink-2)}
.contact-ico{width:34px;height:34px;border-radius:10px;background:var(--surface);border:1px solid var(--line-strong);display:flex;align-items:center;justify-content:center;font-size:16px}
.contact-form{padding:48px 44px;display:flex;flex-direction:column;gap:18px}
.form-row{display:grid;grid-template-columns:1fr 1fr;gap:18px}
.field{display:flex;flex-direction:column;gap:7px}
.field-label{font-size:13px;font-weight:600;color:var(--ink-2);letter-spacing:.01em}
.field input,.field textarea{
    padding:13px 16px;border-radius:var(--radius-sm);
    border:1px solid var(--line-strong);background:rgba(255,255,255,.7);
    font-size:14px;color:var(--ink);transition:border-color var(--t-fast),box-shadow var(--t-fast),background var(--t-fast);
    width:100%;font-family:inherit;
}
.field input::placeholder,.field textarea::placeholder{color:var(--muted)}
.field input:focus,.field textarea:focus{
    outline:none;border-color:var(--mint);background:#fff;
    box-shadow:0 0 0 4px rgba(45,212,191,.15);
}
.field textarea{resize:vertical;min-height:110px}
.field.invalid input,.field.invalid textarea{border-color:#ef4444;box-shadow:0 0 0 4px rgba(239,68,68,.1)}
.field.consent{flex-direction:row;align-items:flex-start;gap:10px;font-size:13px;color:var(--ink-3)}
.field.consent input{width:18px;height:18px;flex:0 0 18px;margin-top:2px;accent-color:var(--mint)}
.field.consent span{line-height:1.55}
.form-note{font-size:13.5px;min-height:20px;text-align:center}
.form-note.ok{color:var(--mint-deep)}
.form-note.err{color:#ef4444}

/* 页脚 */
.footer{background:linear-gradient(180deg,var(--bg),#e6f5f1);border-top:1px solid var(--line);padding:60px 28px 28px}
.footer-inner{max-width:var(--container);margin:0 auto;display:grid;grid-template-columns:1.2fr 2fr;gap:48px}
.footer-brand{display:flex;align-items:center;gap:12px}
.footer-brand img{border-radius:12px;border:1px solid var(--line)}
.footer-nav{display:grid;grid-template-columns:repeat(3,1fr);gap:32px}
.footer-col h4{font-size:14px;font-weight:700;color:var(--ink);margin-bottom:14px}
.footer-col a{display:block;font-size:14px;color:var(--ink-3);padding:5px 0;transition:color var(--t-fast)}
.footer-col a:hover{color:var(--mint-deep)}
.subscribe{display:flex;gap:8px;margin-top:8px}
.subscribe input{flex:1;padding:9px 14px;border-radius:999px;border:1px solid var(--line-strong);font-size:13px;background:#fff}
.subscribe input:focus{outline:none;border-color:var(--mint);box-shadow:0 0 0 3px rgba(45,212,191,.15)}
.subscribe-note{font-size:12px;margin-top:8px;min-height:16px}
.subscribe-note.ok{color:var(--mint-deep)}
.subscribe-note.err{color:#ef4444}
.footer-bottom{max-width:var(--container);margin:40px auto 0;padding-top:24px;border-top:1px solid var(--line);display:flex;justify-content:space-between;align-items:center;gap:16px;flex-wrap:wrap;font-size:13px;color:var(--muted)}
.footer-author{color:var(--mint-2);font-weight:600;text-decoration:none;transition:opacity var(--t-fast)}
.footer-author:hover{opacity:.8}

/* 回到顶部 */
.to-top{
    position:fixed;right:24px;bottom:24px;z-index:90;
    width:46px;height:46px;border-radius:50%;
    background:var(--surface);border:1px solid var(--line-strong);
    box-shadow:var(--shadow);color:var(--mint-deep);
    display:flex;align-items:center;justify-content:center;
    opacity:0;visibility:hidden;transform:translateY(10px);
    transition:opacity var(--t),transform var(--t),visibility var(--t),background var(--t-fast),color var(--t-fast);
}
.to-top.show{opacity:1;visibility:visible;transform:translateY(0)}
.to-top:hover{background:var(--grad);color:#fff;transform:translateY(-2px)}

/* 滚动入场 */
.reveal{opacity:0;transform:translateY(28px);transition:opacity var(--t-slow),transform var(--t-slow)}
.reveal.in{opacity:1;transform:none}

/* ===== 响应式 ===== */
@media (max-width:1024px){
    .hero-grid{grid-template-columns:1fr;gap:48px}
    .hero-visual{order:-1;margin-bottom:0}
    .hero-meta{justify-content:flex-start;flex-wrap:wrap;gap:18px}
    .meta-sep{display:none}
    .security-grid{grid-template-columns:1fr;gap:40px}
    .sec-visual{width:320px;height:320px;margin:0 auto}
    .ring-1{width:320px;height:320px}
    .ring-2{width:230px;height:230px}
    .ring-3{width:150px;height:150px}
    .feature-grid,.coin-grid{grid-template-columns:repeat(2,1fr)}
    .stats-grid{grid-template-columns:repeat(2,1fr)}
    .footer-inner{grid-template-columns:1fr;gap:32px}
}

@media (max-width:768px){
    .nav-links,.nav-actions{display:none}
    .nav-toggle{display:flex}
    .nav-mobile{display:flex}
    .nav-inner{padding:10px 18px;gap:10px}
    .brand-logo{width:34px;height:34px}
    .brand-zh{font-size:15px}
    .hero{padding:84px 18px 48px}
    .hero-badge{font-size:11.5px;padding:6px 12px}
    .hero-grid{gap:30px}
    .hero-visual{transform:scale(.84);margin-bottom:-10px}
    .phone-frame{width:250px;height:512px}
    .hero-meta{gap:16px;margin-top:28px;flex-wrap:wrap}
    .meta-num{font-size:19px}
    .meta-label{font-size:11px}
    .meta-sep{display:none}
    .section{padding:54px 18px}
    .section-head{margin-bottom:34px}
    .feature-grid,.coin-grid{grid-template-columns:1fr;gap:14px}
    .feature-card{padding:24px 22px}
    .feature-card h3{font-size:18px}
    .stats-grid{grid-template-columns:repeat(2,1fr);gap:12px}
    .stat-num{font-size:23px}
    .stat-card{padding:22px 14px}
    .steps{flex-direction:column;gap:0}
    .step{max-width:none;width:100%;padding:24px 22px}
    .step-num{font-size:34px}
    .step-connector{flex:0 0 22px;min-height:22px}
    .step-connector::before{width:2px;height:100%;background:linear-gradient(180deg,var(--mint),var(--cyan))}
    .security-grid{grid-template-columns:1fr;gap:32px}
    .sec-visual{width:260px;height:260px;margin:0 auto}
    .ring-1{width:260px;height:260px}
    .ring-2{width:188px;height:188px}
    .ring-3{width:120px;height:120px}
    .ring-core{width:92px;height:92px;border-radius:24px}
    .ring-core svg{width:28px;height:28px}
    .contact-card{grid-template-columns:1fr}
    .contact-left,.contact-form{padding:30px 22px}
    .form-row{grid-template-columns:1fr;gap:14px}
    .footer-inner{grid-template-columns:1fr;gap:28px}
    .footer-nav{grid-template-columns:1fr 1fr;gap:22px}
    .footer-bottom{flex-direction:column;align-items:flex-start;gap:8px}
    .footer-disclaimer{font-size:11.5px}
    .float-chip{font-size:11px;padding:7px 11px}
    .chip-a,.chip-b,.chip-c{display:none}
}

@media (max-width:420px){
    .hero{padding:74px 14px 40px}
    .hero-grid{gap:24px}
    .hero-visual{transform:scale(.8);margin-bottom:-14px}
    .phone-frame{width:222px;height:456px}
    .section{padding:46px 14px}
    .section-head{margin-bottom:30px}
    .nav-inner{padding:9px 14px}
    .nav-mobile{padding:0 14px 14px}
    .nav-mobile.open{padding:0 14px 18px}
    .footer-nav{grid-template-columns:1fr}
    .stats-grid{grid-template-columns:1fr 1fr;gap:10px}
    .stat-num{font-size:21px}
    .stat-card{padding:20px 12px}
    .contact-left,.contact-form{padding:26px 18px}
    .btn-lg{padding:13px 22px;font-size:14px}
    .hero-cta{flex-direction:column}
    .hero-cta .btn{width:100%}
    .hero-title{font-size:26px}
    .hero-sub{font-size:13.5px}
    .section-title{font-size:21px}
    .section-sub{font-size:14.5px}
    .tg-keyboard{max-height:168px}
    .tg-key{font-size:10.5px;padding:7px 4px}
    .tg-bubble{font-size:11.5px;padding:7px 11px;line-height:1.5}
    .tg-receipt-row{font-size:11px}
    .tg-pay-btn{font-size:12px;padding:7px}
    .feature-card{padding:22px 18px}
    .step{padding:22px 18px}
    .step-num{font-size:30px}
    .sec-visual{width:220px;height:220px}
    .ring-1{width:220px;height:220px}
    .ring-2{width:160px;height:160px}
    .ring-3{width:104px;height:104px}
    .ring-core{width:80px;height:80px;border-radius:20px}
    .ring-core svg{width:24px;height:24px}
}

/* 竖屏手机 · portrait 优化 */
@media (max-width:768px) and (orientation:portrait){
    .hero-grid{gap:28px}
    .hero-visual{transform:scale(.82)}
}
/* 横屏手机 */
@media (max-width:900px) and (orientation:landscape) and (max-height:500px){
    .hero{padding:90px 20px 40px}
    .hero-grid{grid-template-columns:1fr;gap:24px}
    .hero-visual{transform:scale(.7)}
    .phone-frame{width:240px;height:480px}
    .section{padding:50px 20px}
}