/* ===== Layout helpers ===== */
.container{max-width:1180px;margin:0 auto;padding:0 24px}
.section{padding:96px 0;position:relative}
.section-head{text-align:center;margin-bottom:56px}
.section-title{font-size:clamp(28px,3.4vw,42px);font-weight:800;line-height:1.2;letter-spacing:-.02em}
.section-sub{color:var(--muted);margin-top:14px;font-size:17px}
.grad-text{background:var(--grad);-webkit-background-clip:text;background-clip:text;color:transparent}

/* ===== Buttons ===== */
.btn{display:inline-flex;align-items:center;justify-content:center;gap:8px;padding:12px 22px;border-radius:10px;font-weight:600;font-size:15px;transition:.25s;white-space:nowrap;border:1px solid transparent}
.btn-primary{background:var(--grad);color:#fff;box-shadow:0 8px 24px rgba(124,92,255,.35)}
.btn-primary:hover{transform:translateY(-2px);box-shadow:0 14px 34px rgba(124,92,255,.5)}
.btn-ghost{background:var(--field);color:var(--text);border-color:var(--line2)}
.btn-ghost:hover{background:var(--field-hover)}
.btn-ghost--light{background:var(--field-hover);border-color:var(--line2)}
.btn-sm{padding:9px 16px;font-size:14px}

/* ===== Navbar ===== */
.navbar{position:fixed;top:0;left:0;right:0;z-index:100;transition:.3s;background:rgba(10,10,15,.4);backdrop-filter:blur(8px)}
.navbar.scrolled{background:rgba(10,10,15,.85);backdrop-filter:blur(16px);border-bottom:1px solid var(--line)}
.nav-inner{max-width:1240px;margin:0 auto;padding:14px 24px;display:flex;align-items:center;gap:20px}
.nav-logo{display:flex;align-items:center;gap:9px;font-weight:800;font-size:19px}
.logo-img{width:32px;height:32px;border-radius:8px;object-fit:cover;flex:none;background:var(--field);border:1px solid var(--line)}
.logo-text{letter-spacing:-.01em}
.nav-menu{display:flex;align-items:center;gap:4px;margin-left:18px}
.nav-link{display:inline-flex;flex-direction:column;align-items:flex-start;gap:0;padding:7px 11px;border-radius:8px;color:var(--muted);font-size:13.5px;font-weight:600;line-height:1.15;transition:.2s}
.nav-link .zh{font-size:14px;color:var(--text);font-weight:700}
.nav-link .en{font-size:10.5px;color:var(--muted);font-weight:500;letter-spacing:.02em}
.nav-link:hover{color:var(--text);background:var(--field)}
.nav-link:hover .en{color:var(--muted)}
.caret{font-size:9px;opacity:.6;margin-left:2px}
.nav-actions{margin-left:auto;display:flex;align-items:center;gap:6px}
.nav-link--small{font-size:12px;padding:6px 9px}
.nav-link--small .zh{font-size:12.5px}
.nav-link--small .en{font-size:9.5px}
.nav-toggle{display:none;flex-direction:column;gap:5px;padding:8px}
.nav-toggle span{width:22px;height:2px;background:var(--text);border-radius:2px}

/* Mega Menu */
.has-dropdown{position:relative}
.mega-menu{position:absolute;top:calc(100% + 6px);left:-20px;width:720px;background:var(--glass-menu);border:1px solid var(--line2);border-radius:16px;padding:22px;display:grid;grid-template-columns:1fr 1fr 1.1fr;gap:18px;box-shadow:var(--shadow);opacity:0;visibility:hidden;transform:translateY(8px);transition:.25s}
.has-dropdown:hover .mega-menu,.has-dropdown:focus-within .mega-menu{opacity:1;visibility:visible;transform:translateY(0)}
.mega-col{display:flex;flex-direction:column;gap:4px}
.mega-title{font-size:11px;letter-spacing:.14em;color:var(--muted);margin-bottom:8px;font-weight:700}
.mega-link{font-size:13px;padding:8px 10px;border-radius:8px;color:var(--text);transition:.18s;display:flex;flex-direction:column;gap:1px;line-height:1.2}
.mega-link .zh{font-size:13.5px;font-weight:700;color:var(--text)}
.mega-link .en{font-size:10.5px;color:var(--muted);font-weight:500}
.mega-link:hover{background:rgba(124,92,255,.14);color:var(--brand2)}
.mega-link:hover .zh{color:var(--brand2)}
.mega-feature-card{background:linear-gradient(160deg,rgba(124,92,255,.22),rgba(34,211,238,.12));border:1px solid var(--line2);border-radius:14px;padding:20px;height:100%;display:flex;flex-direction:column;justify-content:space-between;gap:14px}
.mega-feature-tag{font-size:11px;color:var(--brand2);font-weight:700;letter-spacing:.08em;text-transform:uppercase}
.mega-feature-title{font-size:17px;font-weight:800;line-height:1.3}

/* ===== Hero ===== */
.hero{padding:150px 0 70px;position:relative;overflow:hidden}
.hero::before{content:"";position:absolute;width:640px;height:640px;top:-160px;right:-120px;background:radial-gradient(circle,rgba(124,92,255,.28),transparent 65%);filter:blur(10px)}
.hero::after{content:"";position:absolute;width:520px;height:520px;bottom:-120px;left:-140px;background:radial-gradient(circle,rgba(34,211,238,.16),transparent 62%);filter:blur(8px)}
.hero-grid{position:relative;z-index:2;display:grid;grid-template-columns:1.05fr .95fr;gap:48px;align-items:center;max-width:1180px;margin:0 auto;padding:0 24px}
.hero-title{font-size:clamp(38px,5.4vw,66px);font-weight:900;line-height:.98;letter-spacing:-.035em}
.hero-sub{color:var(--muted);margin-top:20px;font-size:19px;max-width:480px}
.hero-cta{display:flex;gap:12px;margin-top:28px;flex-wrap:wrap}
.hero-right{position:relative}
.hero-media{position:relative;aspect-ratio:4/5;max-height:560px;border-radius:26px;overflow:hidden;background:var(--media-bg);border:1px solid var(--line2);box-shadow:var(--shadow)}
.hero-media::before{content:"";position:absolute;inset:0;background:radial-gradient(circle at 50% 40%,rgba(124,92,255,.4),transparent 55%),linear-gradient(180deg,transparent 30%,var(--vignette));z-index:1}
.hero-media-overlay{position:absolute;inset:0;background:var(--overlay-grad);opacity:.75;z-index:0}
.hero-bubble{position:absolute;top:24px;left:24px;z-index:3;background:rgba(255,255,255,.94);color:#111;border-radius:14px;padding:11px 16px;font-size:15px;font-weight:600;box-shadow:0 8px 30px rgba(0,0,0,.3);max-width:78%}
.hero-bubble::after{content:"";position:absolute;bottom:-8px;left:26px;width:16px;height:16px;background:rgba(255,255,255,.94);transform:rotate(45deg);border-radius:3px}
.hero-unmute{position:absolute;top:22px;right:20px;z-index:3;font-size:11px;color:rgba(255,255,255,.8);background:rgba(0,0,0,.4);border:1px solid rgba(255,255,255,.2);padding:5px 11px;border-radius:20px;backdrop-filter:blur(4px)}
.hero-float-card{position:absolute;z-index:3;background:var(--glass-strong);border:1px solid var(--line2);border-radius:14px;padding:12px 15px;display:flex;align-items:center;gap:12px;backdrop-filter:blur(10px);box-shadow:var(--shadow);animation:float 5s ease-in-out infinite;translate:var(--dx,0) var(--dy,0);transition:translate .6s ease}
.hero-float-card--1{top:23%;left:-18px;animation-delay:-1.5s}
.hero-float-card--2{bottom:44px;right:18px}
.hero-float-card strong{display:block;font-size:14px}
.hero-float-card small{color:var(--muted);font-size:12px}
.fc-icon{font-size:22px}
@keyframes float{0%,100%{transform:translateY(0)}50%{transform:translateY(-10px)}}

/* AI Card */
.ai-card{margin-top:34px;background:var(--glass-panel);border:1px solid var(--line2);border-radius:18px;overflow:hidden;backdrop-filter:blur(10px);max-width:520px;box-shadow:var(--shadow)}
.ai-card-head{display:flex;align-items:center;gap:6px;padding:12px 16px;border-bottom:1px solid var(--line);background:rgba(255,255,255,.02)}
.ai-dot{width:9px;height:9px;border-radius:50%;background:#3a3a48}
.ai-dot:nth-child(1){background:#ff5f57}.ai-dot:nth-child(2){background:#febc2e}.ai-dot:nth-child(3){background:#28c840}
.ai-card-title{margin-left:auto;font-size:12px;color:var(--muted);font-weight:600}
.ai-chat{padding:16px;display:flex;flex-direction:column;gap:10px;max-height:210px;overflow-y:auto}
.ai-msg{font-size:14px;padding:10px 14px;border-radius:12px;max-width:85%;line-height:1.45;animation:msgIn .3s ease}
.ai-msg--bot{background:rgba(255,255,255,.07);align-self:flex-start;border-bottom-left-radius:4px}
.ai-msg--user{background:var(--brand);color:#fff;align-self:flex-end;border-bottom-right-radius:4px}
@keyframes msgIn{from{opacity:0;transform:translateY(6px)}to{opacity:1;transform:translateY(0)}}
.ai-input{display:flex;gap:8px;padding:12px;background:var(--input-bar)}
.ai-input input{flex:1;background:var(--field);border:1px solid var(--line);border-radius:10px;padding:11px 14px;font-size:14px;outline:none;transition:.2s}
.ai-input input:focus{border-color:var(--brand)}
.ai-send{width:42px;height:42px;border-radius:10px;background:var(--grad);color:#fff;font-size:16px;display:flex;align-items:center;justify-content:center;transition:.2s}
.ai-send:hover{transform:scale(1.06)}

/* Trust bar */
.trustbar{position:relative;z-index:2;margin-top:64px;text-align:center}
.trustbar-label{color:var(--muted);font-size:13px;letter-spacing:.04em;text-transform:uppercase;margin-bottom:18px}
.trustbar-logos{display:flex;flex-wrap:wrap;justify-content:center;gap:38px;align-items:center;opacity:.7}
.trustbar-logos span{font-size:19px;font-weight:700;color:var(--muted);letter-spacing:-.01em;filter:grayscale(.4)}

/* ===== Features ===== */
.features{background:linear-gradient(180deg,transparent,rgba(124,92,255,.04) 40%,transparent)}
.feature-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:22px}
.feature-card{background:var(--card);border:1px solid var(--line);border-radius:var(--r2);padding:28px;transition:.3s;display:flex;flex-direction:column;gap:10px;position:relative;overflow:hidden}
.feature-card::before{content:"";position:absolute;top:0;left:0;right:0;height:3px;background:var(--grad);opacity:0;transition:.3s}
.feature-card:hover{transform:translateY(-6px);border-color:var(--line2);box-shadow:var(--shadow)}
.feature-card:hover::before{opacity:1}
.feature-icon{width:52px;height:52px;border-radius:14px;background:rgba(124,92,255,.14);display:flex;align-items:center;justify-content:center;font-size:24px}
.feature-card h3{font-size:19px;font-weight:800;margin-top:4px}
.feature-card p{color:var(--muted);font-size:14.5px;flex:1}
.feature-link{color:var(--brand2);font-size:14px;font-weight:600;margin-top:4px}

/* ===== Steps ===== */
.steps{background:var(--alt-bg)}
.step-row{display:flex;align-items:stretch;gap:0;justify-content:center;flex-wrap:wrap}
.step{background:var(--card);border:1px solid var(--line);border-radius:var(--r2);padding:28px 18px;text-align:center;flex:1;min-width:170px;max-width:300px;position:relative}
.step-num{width:48px;height:48px;border-radius:14px;background:var(--grad);display:flex;align-items:center;justify-content:center;font-size:21px;font-weight:900;color:#fff;margin:0 auto 16px}
.step h3{font-size:20px;font-weight:800;margin-bottom:8px}
.step p{color:var(--muted);font-size:14.5px}
.step-arrow{display:flex;align-items:center;font-size:30px;color:var(--brand);padding:0 6px;opacity:.6}

/* ===== CTA ===== */
.cta{padding-bottom:110px}
.cta-card{background:linear-gradient(135deg,rgba(124,92,255,.25),rgba(34,211,238,.14));border:1px solid var(--line2);border-radius:26px;padding:56px 32px;text-align:center;position:relative;overflow:hidden}
.cta-card::before{content:"";position:absolute;inset:0;background:radial-gradient(circle at 80% 20%,rgba(124,92,255,.3),transparent 50%)}
.cta-card h2{font-size:clamp(26px,3vw,38px);font-weight:900;position:relative;z-index:2}
.cta-card p{color:var(--muted);margin:12px 0 26px;position:relative;z-index:2}
.cta-actions{display:flex;gap:12px;justify-content:center;flex-wrap:wrap;position:relative;z-index:2}

/* ===== Footer ===== */
.footer{background:var(--footer-bg);border-top:1px solid var(--line);padding:60px 0 24px}
.footer-grid{display:grid;grid-template-columns:1.5fr repeat(4,1fr);gap:36px;margin-bottom:40px}
.footer-brand p{color:var(--muted);font-size:14px;margin-top:12px;max-width:260px}
.footer-col{display:flex;flex-direction:column;gap:10px}
.footer-col h5{font-size:13px;letter-spacing:.1em;text-transform:uppercase;color:var(--muted);margin-bottom:4px;font-weight:700}
.footer-col a{color:var(--text);font-size:14px;opacity:.8;transition:.18s}
.footer-col a:hover{opacity:1;color:var(--brand2)}
.footer-col a .zh{display:block;font-size:14px;font-weight:600;color:var(--text)}
.footer-col a .en{display:block;font-size:10.5px;font-weight:500;color:var(--muted);margin-top:1px}
.footer-bottom{display:flex;justify-content:space-between;align-items:center;padding-top:20px;border-top:1px solid var(--line);color:var(--muted);font-size:13px}