/* ===== 基础变量与重置 ===== */
:root{
    --bg:#050814;
    --bg-2:#0a1024;
    --panel:rgba(16,24,48,.55);
    --cyan:#00e5ff;
    --purple:#7c4dff;
    --gold:#ffcf3a;
    --gold-deep:#ff9d2e;
    --text:#e8eeff;
    --muted:#8a96b8;
    --border:rgba(0,229,255,.18);
    --glow:0 0 24px rgba(0,229,255,.45);
}
*{margin:0;padding:0;box-sizing:border-box}
html{scroll-behavior:smooth}
body{
    font-family:"PingFang SC","Microsoft YaHei",-apple-system,"Segoe UI",Roboto,sans-serif;
    background:radial-gradient(ellipse at 20% -10%,#0d1a3d 0%,transparent 55%),
               radial-gradient(ellipse at 90% 10%,#1a0d3d 0%,transparent 50%),
               var(--bg);
    color:var(--text);
    overflow-x:hidden;
    line-height:1.6;
    min-height:100vh;
}
a{color:inherit;text-decoration:none}
ul{list-style:none}

/* ===== 背景画布 ===== */
#bg-canvas,#fx-canvas{
    position:fixed;inset:0;
    width:100%;height:100%;
    pointer-events:none;
    z-index:1;
}
#fx-canvas{z-index:90}
.grid-overlay{
    position:fixed;inset:0;z-index:0;pointer-events:none;
    background-image:
        linear-gradient(rgba(0,229,255,.04) 1px,transparent 1px),
        linear-gradient(90deg,rgba(0,229,255,.04) 1px,transparent 1px);
    background-size:54px 54px;
    mask-image:radial-gradient(ellipse at 50% 40%,#000 30%,transparent 80%);
}
.scanlines{
    position:fixed;inset:0;z-index:91;pointer-events:none;opacity:.5;
    background:repeating-linear-gradient(0deg,rgba(0,229,255,.03) 0 1px,transparent 1px 3px);
    mix-blend-mode:overlay;
}

/* ===== 导航 ===== */
.nav{
    position:fixed;top:0;left:0;right:0;z-index:100;
    backdrop-filter:blur(14px);
    background:rgba(5,8,20,.6);
    border-bottom:1px solid var(--border);
    transition:background .3s;
}
.nav-inner{
    max-width:1240px;margin:0 auto;padding:14px 28px;
    display:flex;align-items:center;justify-content:space-between;gap:24px;
}
.logo{display:flex;align-items:center;gap:12px;position:relative}
.logo-mark{position:relative;overflow:hidden;border-radius:12px}
.logo-mark svg{display:block;filter:drop-shadow(0 0 8px rgba(0,229,255,.5))}
.logo-mark.small svg{filter:drop-shadow(0 0 6px rgba(0,229,255,.4))}
/* Logo 扫光特效 */
.logo-shine{
    position:absolute;top:0;left:-60%;width:50%;height:100%;
    background:linear-gradient(110deg,transparent 0%,rgba(255,255,255,.0) 30%,rgba(255,255,255,.85) 50%,rgba(255,255,255,.0) 70%,transparent 100%);
    transform:skewX(-18deg);
    animation:logo-shine 3.2s ease-in-out infinite;
    pointer-events:none;
}
@keyframes logo-shine{
    0%,55%{left:-60%}
    90%,100%{left:130%}
}
.logo-text{font-size:22px;font-weight:800;letter-spacing:1px}
.logo-text .accent{
    background:linear-gradient(90deg,var(--gold),var(--cyan));
    -webkit-background-clip:text;background-clip:text;color:transparent;
}
.nav-links{display:flex;gap:30px}
.nav-links a{
    font-size:15px;color:var(--muted);position:relative;transition:color .25s;
}
.nav-links a::after{
    content:"";position:absolute;left:0;bottom:-6px;width:0;height:2px;
    background:linear-gradient(90deg,var(--cyan),var(--purple));
    transition:width .3s;border-radius:2px;
}
.nav-links a:hover{color:var(--text)}
.nav-links a:hover::after{width:100%}
.nav-cta{
    padding:9px 22px;border-radius:30px;font-size:14px;font-weight:600;
    background:linear-gradient(90deg,var(--cyan),var(--purple));
    color:#04122e;box-shadow:var(--glow);transition:transform .25s,box-shadow .25s;
}
.nav-cta:hover{transform:translateY(-2px);box-shadow:0 0 34px rgba(124,77,255,.6)}
.nav-toggle{display:none} /* 仅移动端显示 */

/* ===== Hero ===== */
.hero{
    position:relative;z-index:5;
    min-height:100vh;display:flex;flex-direction:column;align-items:center;justify-content:center;
    text-align:center;padding:120px 24px 60px;
}
.hero-bg-rings{
    position:absolute;top:50%;left:50%;transform:translate(-50%,-50%);
    width:900px;height:900px;pointer-events:none;opacity:.5;
    background:
        radial-gradient(circle,transparent 30%,rgba(0,229,255,.08) 31%,transparent 32%),
        radial-gradient(circle,transparent 45%,rgba(124,77,255,.08) 46%,transparent 47%),
        radial-gradient(circle,transparent 60%,rgba(0,229,255,.06) 61%,transparent 62%);
    animation:spin 40s linear infinite;
}
@keyframes spin{to{transform:translate(-50%,-50%) rotate(360deg)}}
.badge{
    display:inline-flex;align-items:center;gap:8px;
    padding:7px 16px;border-radius:30px;font-size:13px;
    background:rgba(0,229,255,.08);border:1px solid var(--border);
    color:var(--cyan);margin-bottom:28px;
}
.badge .dot{width:7px;height:7px;border-radius:50%;background:var(--cyan);box-shadow:0 0 8px var(--cyan);animation:pulse 1.6s infinite}
@keyframes pulse{0%,100%{opacity:1}50%{opacity:.3}}
.hero-title{font-size:clamp(40px,7vw,82px);font-weight:900;line-height:1.05;letter-spacing:2px}
.hero-title .line{display:block}
.gradient-text{
    background:linear-gradient(90deg,var(--cyan) 0%,#56b8ff 40%,var(--purple) 100%);
    -webkit-background-clip:text;background-clip:text;color:transparent;
}
.hero-desc{color:var(--muted);font-size:17px;margin:26px 0 38px;max-width:640px}
.hero-actions{display:flex;gap:18px;justify-content:center;flex-wrap:wrap}
.btn{
    display:inline-flex;align-items:center;gap:9px;
    padding:14px 30px;border-radius:30px;font-size:15px;font-weight:600;
    cursor:pointer;border:none;transition:all .28s;position:relative;overflow:hidden;
}
.btn-primary{
    background:linear-gradient(90deg,var(--cyan),var(--purple));
    color:#04122e;box-shadow:0 8px 30px rgba(0,229,255,.35);
}
.btn-primary:hover{transform:translateY(-3px);box-shadow:0 12px 40px rgba(124,77,255,.55)}
.btn-ghost{background:rgba(255,255,255,.04);color:var(--text);border:1px solid var(--border)}
.btn-ghost:hover{background:rgba(0,229,255,.1);border-color:var(--cyan)}
.btn-outline{background:transparent;color:var(--cyan);border:1.5px solid var(--cyan)}
.btn-outline:hover{background:rgba(0,229,255,.12);transform:translateY(-3px)}
.btn-block{width:100%;justify-content:center}
.btn::before{
    content:"";position:absolute;top:0;left:-100%;width:100%;height:100%;
    background:linear-gradient(120deg,transparent,rgba(255,255,255,.35),transparent);
    transition:left .55s;
}
.btn:hover::before{left:100%}

.hero-stats{display:flex;gap:54px;margin-top:64px;flex-wrap:wrap;justify-content:center}
.stat{display:flex;flex-direction:column;align-items:center}
.stat .num{font-size:42px;font-weight:900;background:linear-gradient(90deg,var(--cyan),var(--gold));-webkit-background-clip:text;background-clip:text;color:transparent}
.stat .suffix{font-size:24px;font-weight:700;color:var(--gold);margin-top:-8px}
.stat .label{font-size:13px;color:var(--muted);margin-top:4px;letter-spacing:1px}

.scroll-hint{position:absolute;bottom:34px;left:50%;transform:translateX(-50%);display:flex;flex-direction:column;align-items:center;gap:10px;color:var(--muted);font-size:12px;letter-spacing:2px}
.mouse{width:24px;height:38px;border:2px solid var(--muted);border-radius:14px;display:flex;justify-content:center;padding-top:6px}
.wheel{width:4px;height:8px;border-radius:2px;background:var(--cyan);animation:wheel 1.6s infinite}
@keyframes wheel{0%{opacity:0;transform:translateY(-4px)}40%{opacity:1}100%{opacity:0;transform:translateY(10px)}}

/* ===== 通用区块 ===== */
section{position:relative;z-index:5;padding:100px 24px;max-width:1240px;margin:0 auto}
.section-head{text-align:center;margin-bottom:56px}
.section-tag{font-family:"Consolas",monospace;color:var(--cyan);font-size:13px;letter-spacing:3px;display:block;margin-bottom:12px}
.section-head h2{font-size:clamp(30px,4vw,44px);font-weight:800;margin-bottom:12px}
.section-head p{color:var(--muted);font-size:16px}

/* ===== 下载卡片 ===== */
.download-grid{display:grid;grid-template-columns:repeat(4,1fr);gap:24px}
.dl-card{
    position:relative;padding:36px 30px;border-radius:20px;
    background:var(--panel);
    border:1px solid var(--border);
    backdrop-filter:blur(12px);
    transition:transform .35s,border-color .35s;
    overflow:hidden;
}
.dl-card:hover{transform:translateY(-8px);border-color:rgba(0,229,255,.5)}
.dl-card.featured{border-color:rgba(0,229,255,.45);box-shadow:0 0 40px rgba(0,229,255,.12)}
.card-glow{
    position:absolute;top:-40%;right:-30%;width:260px;height:260px;border-radius:50%;
    background:radial-gradient(circle,rgba(0,229,255,.18),transparent 70%);
    pointer-events:none;opacity:0;transition:opacity .4s;
}
.dl-card:hover .card-glow{opacity:1}
.card-head{display:flex;align-items:center;justify-content:space-between;margin-bottom:22px}
.card-icon{
    width:58px;height:58px;border-radius:14px;display:flex;align-items:center;justify-content:center;
    background:linear-gradient(135deg,rgba(0,229,255,.18),rgba(124,77,255,.18));
    border:1px solid var(--border);color:var(--cyan);
}
.card-tag{font-size:11px;font-weight:700;padding:4px 12px;border-radius:20px;letter-spacing:1px;
    background:rgba(0,229,255,.15);color:var(--cyan);border:1px solid var(--border)}
.card-tag.green{background:rgba(80,255,160,.12);color:#5fffa0;border-color:rgba(80,255,160,.3)}
.card-tag.gold{background:rgba(255,207,58,.12);color:var(--gold);border-color:rgba(255,207,58,.3)}
.dl-card h3{font-size:24px;font-weight:800;margin-bottom:6px}
.card-sub{color:var(--muted);font-size:14px;margin-bottom:22px}
.card-features{margin-bottom:24px}
.card-features li{
    position:relative;padding:8px 0 8px 26px;font-size:14px;color:#cdd8f0;border-bottom:1px dashed rgba(255,255,255,.06);
}
.card-features li::before{
    content:"";position:absolute;left:0;top:14px;width:14px;height:14px;border-radius:50%;
    background:radial-gradient(circle,var(--cyan),transparent 70%);box-shadow:0 0 8px var(--cyan);
}
.card-meta{display:flex;flex-wrap:wrap;gap:8px;margin-bottom:24px}
.card-meta span{font-size:12px;color:var(--muted);padding:4px 10px;border-radius:8px;background:rgba(255,255,255,.04);border:1px solid rgba(255,255,255,.06)}

/* ===== 特色 ===== */
.feature-grid{display:grid;grid-template-columns:repeat(4,1fr);gap:22px}
.feature{
    padding:32px 26px;border-radius:18px;background:var(--panel);
    border:1px solid var(--border);backdrop-filter:blur(10px);
    transition:transform .35s,border-color .35s;
}
.feature:hover{transform:translateY(-6px);border-color:rgba(0,229,255,.5)}
.feature-icon{
    width:54px;height:54px;border-radius:14px;display:flex;align-items:center;justify-content:center;
    background:linear-gradient(135deg,rgba(124,77,255,.2),rgba(0,229,255,.2));color:var(--cyan);
    margin-bottom:18px;box-shadow:inset 0 0 16px rgba(0,229,255,.15);
}
.feature h3{font-size:19px;font-weight:700;margin-bottom:10px}
.feature p{color:var(--muted);font-size:14px}

/* ===== FAQ ===== */
.faq-list{max-width:820px;margin:0 auto;display:flex;flex-direction:column;gap:14px}
.faq-item{
    padding:20px 24px;border-radius:14px;background:var(--panel);
    border:1px solid var(--border);backdrop-filter:blur(10px);transition:border-color .3s;
}
.faq-item[open]{border-color:rgba(0,229,255,.4)}
.faq-item summary{
    cursor:pointer;font-size:16px;font-weight:600;list-style:none;
    display:flex;justify-content:space-between;align-items:center;
}
.faq-item summary::-webkit-details-marker{display:none}
.faq-item summary::after{
    content:"+";font-size:22px;color:var(--cyan);transition:transform .3s;font-weight:300;
}
.faq-item[open] summary::after{transform:rotate(45deg)}
.faq-item p{color:var(--muted);font-size:14px;margin-top:14px;padding-top:14px;border-top:1px solid rgba(255,255,255,.06)}

/* ===== 页脚 ===== */
.footer{position:relative;z-index:5;border-top:1px solid var(--border);background:rgba(5,8,20,.6);backdrop-filter:blur(12px);margin-top:40px}
.footer-inner{max-width:1240px;margin:0 auto;padding:48px 24px;text-align:center}
.footer-brand{display:flex;align-items:center;justify-content:center;gap:10px;margin-bottom:14px}
.footer-desc{color:var(--muted);font-size:14px;margin-bottom:22px}
.footer-links{display:flex;gap:24px;justify-content:center;margin-bottom:24px;flex-wrap:wrap}
.footer-links a{color:var(--muted);font-size:14px;transition:color .25s}
.footer-links a:hover{color:var(--cyan)}
.copyright{font-size:12px;color:#5a6688}

/* ===== 响应式 ===== */
.mobile-only-hint{display:none} /* 仅移动端显示 */

@media (max-width:1200px){
    .download-grid{grid-template-columns:repeat(2,1fr)}
}

@media (max-width:900px){
    /* —— 导航：汉堡菜单 —— */
    .nav-inner{padding:12px 18px;gap:10px}
    .nav-cta{padding:8px 16px;font-size:13px}
    .nav-toggle{
        display:inline-flex;flex-direction:column;justify-content:center;align-items:center;
        width:40px;height:40px;border-radius:10px;cursor:pointer;
        background:rgba(0,229,255,.08);border:1px solid var(--border);color:var(--cyan);
    }
    .nav-toggle span,.nav-toggle span::before,.nav-toggle span::after{
        content:"";display:block;width:18px;height:2px;background:var(--cyan);
        border-radius:2px;transition:transform .3s,opacity .3s;
    }
    .nav-toggle span::before{transform:translateY(-6px)}
    .nav-toggle span::after{transform:translateY(4px)}
    .nav-toggle.active span{background:transparent}
    .nav-toggle.active span::before{transform:rotate(45deg)}
    .nav-toggle.active span::after{transform:rotate(-45deg)}
    .nav-links{
        display:none;position:absolute;top:calc(100% + 6px);right:18px;left:18px;
        flex-direction:column;gap:0;
        background:rgba(10,16,36,.97);border:1px solid var(--border);
        border-radius:14px;padding:6px 0;backdrop-filter:blur(14px);
        box-shadow:0 14px 44px rgba(0,0,0,.55);
    }
    .nav-links.open{display:flex}
    .nav-links a{padding:13px 22px;font-size:15px;border-bottom:1px solid rgba(255,255,255,.05)}
    .nav-links a:last-child{border-bottom:none}
    .nav-links a::after{display:none}

    /* —— Hero —— */
    .hero{padding:108px 18px 50px}
    .hero-desc{font-size:15px;margin:20px 0 30px}
    .hero-actions{flex-direction:column;width:100%;max-width:320px;margin:0 auto}
    .hero-actions .btn{width:100%;justify-content:center}
    .hero-stats{gap:24px;margin-top:46px}
    .badge{font-size:12px;padding:6px 14px}
    .scroll-hint{display:none}

    /* —— 下载区：仅保留拨号端 —— */
    .download-grid{grid-template-columns:1fr}
    .dl-card.client,.dl-card.portable,.dl-card.win7{display:none}
    .dl-card.dialer{
        max-width:440px;margin:0 auto;
        border-color:rgba(0,229,255,.45);
        box-shadow:0 0 40px rgba(0,229,255,.14);
    }
    .dl-card.dialer .card-tag{background:rgba(0,229,255,.15);color:var(--cyan);border-color:var(--border)}
    .dl-card.dialer .btn-outline{
        background:linear-gradient(90deg,var(--cyan),var(--purple));
        color:#04122e;border:none;box-shadow:0 8px 26px rgba(0,229,255,.3);
    }
    .mobile-only-hint{
        display:block;text-align:center;margin:24px auto 0;max-width:440px;
        font-size:13px;color:var(--muted);line-height:1.7;
        padding:14px 18px;border-radius:12px;
        background:rgba(255,255,255,.03);border:1px dashed rgba(255,255,255,.1);
    }

    /* —— 特色 / FAQ / 通用 —— */
    .feature-grid{grid-template-columns:repeat(2,1fr)}
    .section-head{margin-bottom:38px}
    .section-head h2{font-size:28px}
    section{padding:64px 18px}
    .footer-inner{padding:40px 18px}
}
@media (max-width:560px){
    .feature-grid{grid-template-columns:1fr}
    .stat .num{font-size:30px}
    .stat .suffix{font-size:18px}
    .hero-title{letter-spacing:1px}
    .dl-card{padding:28px 22px}
    .hero-stats{gap:18px}
    .badge{font-size:11px}
}