@charset "UTF-8";
:root {
  --primary: #5B8DEF;
  --primary-light: #7BA5F5;
  --primary-lighter: #B8D0FA;
  --primary-lightest: #E8EFFD;
  --primary-dark: #4A72D4;
  --primary-darkest: #3B5CB8;
  --accent: #8B7CF6;
  --accent-light: #A99FF8;
  --accent-lightest: #F0EEFE;
  --white: #FFFFFF;
  --bg: #FFFFFF;
  --bg-alt: #F7F9FC;
  --bg-card: #FFFFFF;
  --bg-hero: linear-gradient(170deg, #EEF2FF 0%, #F7F9FC 40%, #FFFFFF 100%);
  --text: #1A1D2E;
  --text-secondary: #5A5F72;
  --text-tertiary: #8E92A4;
  --text-muted: #B0B4C0;
  --border: #E4E7F0;
  --border-light: #EFF1F6;
  --shadow-xs: 0 1px 2px rgba(0,0,0,.03);
  --shadow-sm: 0 2px 8px rgba(0,0,0,.05);
  --shadow-md: 0 4px 16px rgba(0,0,0,.07);
  --shadow-lg: 0 8px 30px rgba(0,0,0,.09);
  --shadow-xl: 0 16px 48px rgba(0,0,0,.11);
  --shadow-primary: 0 4px 16px rgba(91,141,239,.25);
  --radius-sm: 8px;
  --radius: 12px;
  --radius-lg: 16px;
  --radius-xl: 24px;
  --space-xs: 4px;
  --space-sm: 8px;
  --space-md: 16px;
  --space-lg: 24px;
  --space-xl: 32px;
  --space-2xl: 48px;
  --space-3xl: 64px;
  --space-4xl: 80px;
  --font: -apple-system, BlinkMacSystemFont, "Segoe UI", "PingFang SC", "Microsoft YaHei", "Helvetica Neue", sans-serif;
  --transition: 0.3s cubic-bezier(.4,0,.2,1);
  --transition-fast: 0.2s cubic-bezier(.4,0,.2,1);
  --max-width: 1200px;
}

*,*::before,*::after{margin:0;padding:0;box-sizing:border-box}
html{font-size:16px;scroll-behavior:smooth;-webkit-font-smoothing:antialiased}
body{font-family:var(--font);color:var(--text);background:var(--bg);line-height:1.6;overflow-x:hidden;min-height:100vh}
img{max-width:100%;height:auto;display:block}
a{color:inherit;text-decoration:none;-webkit-tap-highlight-color:transparent}
button{border:none;background:none;cursor:pointer;font-family:inherit;font-size:inherit;-webkit-tap-highlight-color:transparent}
ul,ol{list-style:none}

.container{width:100%;max-width:var(--max-width);margin:0 auto;padding:0 var(--space-lg)}

.btn{display:inline-flex;align-items:center;gap:var(--space-sm);padding:13px 28px;border-radius:28px;font-size:.94rem;font-weight:600;transition:all var(--transition);letter-spacing:.1px;white-space:nowrap}
.btn-primary{background:var(--primary);color:var(--white);box-shadow:0 4px 14px rgba(91,141,239,.3)}
.btn-primary:hover{background:var(--primary-dark);box-shadow:0 6px 20px rgba(91,141,239,.4);transform:translateY(-2px)}
.btn-primary:active{transform:scale(.97)}
.btn-outline{background:var(--white);color:var(--primary);border:2px solid var(--primary)}
.btn-outline:hover{background:var(--primary-lightest);transform:translateY(-2px)}
.btn-outline:active{transform:scale(.97)}
.btn-ghost{color:var(--primary);padding:10px 20px}
.btn-ghost:hover{background:var(--primary-lightest)}
.btn-sm{padding:8px 18px;font-size:.84rem;border-radius:20px}
.btn .i{width:18px;height:18px}

.section{padding:var(--space-4xl) 0;position:relative}
.section-alt{background:var(--bg-alt)}
.section-header{text-align:center;margin-bottom:var(--space-3xl)}
.section-tag{display:inline-block;font-size:.78rem;font-weight:600;color:var(--primary);background:var(--primary-lightest);padding:5px 16px;border-radius:20px;margin-bottom:var(--space-md);letter-spacing:.3px}
.section-header h2{font-size:2.1rem;font-weight:750;color:var(--text);margin-bottom:var(--space-sm);letter-spacing:-.3px}
.section-header p{font-size:1.05rem;color:var(--text-tertiary);max-width:560px;margin:0 auto}

.navbar{position:fixed;top:0;left:0;width:100%;z-index:1000;height:68px;transition:box-shadow var(--transition),border-color var(--transition);background:rgba(255,255,255,.95);backdrop-filter:blur(16px);-webkit-backdrop-filter:blur(16px);border-bottom:1px solid transparent;will-change:transform;transform:translateZ(0)}
.navbar.scrolled{border-bottom-color:var(--border);box-shadow:var(--shadow-xs)}
.navbar .container{display:flex;align-items:center;justify-content:space-between;height:68px}
.nav-logo{display:flex;align-items:center;gap:10px;font-size:1.35rem;font-weight:750;color:var(--text);letter-spacing:-.3px}
.nav-logo img{height:36px;width:auto;border-radius:8px}
.nav-logo span{color:var(--primary)}
.nav-links{display:flex;align-items:center;gap:var(--space-xl)}
.nav-links a{font-size:.9rem;font-weight:500;color:var(--text-secondary);transition:color var(--transition-fast);position:relative}
.nav-links a::after{content:'';position:absolute;bottom:-4px;left:0;width:0;height:2px;background:var(--primary);border-radius:2px;transition:width var(--transition)}
.nav-links a:hover,.nav-links a.active{color:var(--primary)}
.nav-links a:hover::after,.nav-links a.active::after{width:100%}
.nav-cta{padding:10px 22px!important;background:var(--primary)!important;color:var(--white)!important;border-radius:24px!important;font-weight:600!important;box-shadow:var(--shadow-primary)!important;transition:all var(--transition)!important}
.nav-cta::after{display:none!important}
.nav-cta:hover{background:var(--primary-dark)!important;transform:translateY(-2px)!important;box-shadow:0 6px 22px rgba(91,141,239,.4)!important}
.nav-cta:active{transform:scale(.97)!important}
.menu-toggle{display:none;width:42px;height:42px;align-items:center;justify-content:center;border-radius:var(--radius-sm);transition:background var(--transition-fast)}
.menu-toggle:hover{background:var(--bg-alt)}
.menu-toggle .i{width:24px;height:24px}

.mobile-nav{display:flex;position:fixed;top:68px;left:0;width:100%;background:var(--white);border-bottom:1px solid var(--border);box-shadow:var(--shadow-lg);padding:var(--space-lg);z-index:999;visibility:hidden;opacity:0;transform:translateY(-12px);transition:opacity .25s,transform .25s,visibility .25s}
.mobile-nav.active{visibility:visible;opacity:1;transform:translateY(0)}
.mobile-nav ul{display:flex;flex-direction:column;gap:4px}
.mobile-nav a{display:block;padding:12px var(--space-md);font-size:1rem;font-weight:500;color:var(--text);border-radius:var(--radius-sm);transition:all var(--transition-fast)}
.mobile-nav a:hover{background:var(--primary-lightest);color:var(--primary)}
.mobile-nav .nav-cta{display:block;text-align:center;margin-top:var(--space-sm);width:100%}
.mobile-nav .nav-cta:hover{background:var(--primary-dark);color:var(--white)}

.hero{padding:130px 0 var(--space-4xl);background:var(--bg-hero);position:relative;overflow:hidden}
.hero::before{content:'';position:absolute;top:-120px;right:-80px;width:420px;height:420px;background:radial-gradient(circle,rgba(139,124,246,.08) 0%,transparent 70%);border-radius:50%;pointer-events:none}
.hero::after{content:'';position:absolute;bottom:-100px;left:-60px;width:360px;height:360px;background:radial-gradient(circle,rgba(91,141,239,.07) 0%,transparent 70%);border-radius:50%;pointer-events:none}
.hero .container{display:grid;grid-template-columns:1fr 1fr;gap:var(--space-3xl);align-items:center;position:relative;z-index:1}
.hero-content{padding-right:var(--space-xl)}
.hero-badge{display:inline-flex;align-items:center;gap:6px;padding:6px 16px;background:var(--white);border:1px solid var(--border);border-radius:24px;font-size:.8rem;font-weight:600;color:var(--primary);margin-bottom:var(--space-lg);box-shadow:var(--shadow-xs)}
.hero-badge .dot{width:8px;height:8px;background:var(--accent);border-radius:50%;animation:pulse-dot 2s infinite}
@keyframes pulse-dot{0%,100%{opacity:1}50%{opacity:.4}}
.hero .hero-title{font-size:3rem;font-weight:800;line-height:1.22;color:var(--text);margin-bottom:var(--space-sm);letter-spacing:-.6px}
.hero .hero-title span{background:linear-gradient(135deg,var(--primary),var(--accent));-webkit-background-clip:text;-webkit-text-fill-color:transparent;background-clip:text}
.hero-sub{font-size:1.2rem;font-weight:500;color:var(--text-secondary);margin-bottom:var(--space-lg);line-height:1.5}
.hero-desc{font-size:1.1rem;color:var(--text-tertiary);line-height:1.75;margin-bottom:var(--space-xl);max-width:460px}
.hero-actions{display:flex;gap:var(--space-md);flex-wrap:wrap}

.hero-preview{position:relative}
.hero-mockup{border-radius:var(--radius-lg);overflow:hidden;box-shadow:var(--shadow-xl);border:1px solid var(--border);background:var(--white);transition:all var(--transition)}
.hero-mockup:hover{transform:translateY(-6px);box-shadow:0 24px 56px rgba(0,0,0,.12)}
.hero-mockup img{width:100%;display:block}
.hero-float-tag{position:absolute;padding:6px 14px;background:rgba(255,255,255,.95);border:1px solid var(--primary-lighter);border-radius:20px;font-size:.76rem;font-weight:600;color:var(--primary);box-shadow:var(--shadow-md);white-space:nowrap;pointer-events:none;animation:floatY 3s ease-in-out infinite}
.hero-float-tag.t1{top:8%;right:-12px;animation-delay:0s}
.hero-float-tag.t2{bottom:12%;left:-16px;animation-delay:1s}
@keyframes floatY{0%,100%{transform:translateY(0)}50%{transform:translateY(-8px)}}

.hero-tags{display:flex;flex-wrap:wrap;gap:10px;margin-top:var(--space-xl);justify-content:flex-start}
.hero-tag{display:inline-flex;align-items:center;padding:7px 16px;background:var(--white);border:1px solid var(--border-light);border-radius:20px;font-size:.82rem;font-weight:500;color:var(--text-secondary);transition:all var(--transition);cursor:default}
.hero-tag:hover{border-color:var(--primary);color:var(--primary);transform:translateY(-2px);box-shadow:var(--shadow-sm)}
.hero-tag.active{background:var(--primary);color:var(--white);border-color:var(--primary);box-shadow:var(--shadow-primary)}
@media(max-width:1199px){.hero-tags{justify-content:center}}
@media(max-width:767px){.hero-tag{font-size:.76rem;padding:6px 12px}}

.chat-sim{background:var(--white);border-radius:var(--radius-lg);overflow:hidden;box-shadow:var(--shadow-xl);border:1px solid var(--border);position:relative}
.chat-sim-header{display:flex;align-items:center;gap:var(--space-sm);padding:14px var(--space-md);background:#FAFBFC;border-bottom:1px solid var(--border-light)}
.chat-sim-avatar{width:34px;height:34px;border-radius:50%;background:linear-gradient(135deg,var(--primary),var(--accent));display:flex;align-items:center;justify-content:center;color:var(--white);font-size:.85rem;font-weight:700}
.chat-sim-name{font-size:.88rem;font-weight:600;color:var(--text)}
.chat-sim-status{font-size:.72rem;color:var(--primary);display:flex;align-items:center;gap:4px}
.chat-sim-status::before{content:'';width:6px;height:6px;background:var(--primary);border-radius:50%}
.chat-sim-body{padding:var(--space-md);min-height:200px;display:flex;flex-direction:column;gap:var(--space-md)}
.chat-msg{display:flex;gap:var(--space-sm);animation:msgIn .4s ease-out}
.chat-msg.ai{align-items:flex-start}
.chat-msg.user{flex-direction:row-reverse}
.chat-msg .avatar{width:30px;height:30px;border-radius:50%;flex-shrink:0;display:flex;align-items:center;justify-content:center;font-size:.7rem;font-weight:700;color:var(--white)}
.chat-msg.ai .avatar{background:linear-gradient(135deg,var(--primary),var(--accent))}
.chat-msg.user .avatar{background:var(--text-secondary)}
.chat-msg .bubble{padding:10px 15px;border-radius:16px;font-size:.84rem;line-height:1.5;max-width:75%}
.chat-msg.ai .bubble{background:var(--bg-alt);color:var(--text);border-top-left-radius:4px}
.chat-msg.user .bubble{background:var(--primary);color:var(--white);border-top-right-radius:4px}
.chat-sim-input{margin:0 var(--space-md) var(--space-md);display:flex;align-items:center;gap:var(--space-sm);padding:10px 14px;background:var(--bg-alt);border-radius:28px;border:1px solid var(--border-light)}
.chat-sim-input input{border:none;background:none;flex:1;font-size:.84rem;outline:none;color:var(--text);font-family:var(--font)}
.chat-sim-input input::placeholder{color:var(--text-muted)}
.chat-sim-input .send-btn{width:34px;height:34px;border-radius:50%;background:var(--primary);display:flex;align-items:center;justify-content:center;transition:all var(--transition-fast);flex-shrink:0}
.chat-sim-input .send-btn .i{width:16px;height:16px;color:#fff}
.chat-sim-input .send-btn:hover{background:var(--primary-dark);transform:scale(1.08)}
@keyframes msgIn{from{opacity:0;transform:translateY(12px)}to{opacity:1;transform:translateY(0)}}

.emotion-core{text-align:center;margin-bottom:var(--space-3xl)}
.emotion-aura{position:relative;width:180px;height:180px;margin:0 auto var(--space-xl);display:flex;align-items:center;justify-content:center}
.aura-ring{position:absolute;border-radius:50%;border:1px solid var(--primary-lighter);animation:auraPulse 3s ease-in-out infinite}
.aura-ring.ar-1{width:180px;height:180px;animation-delay:0s}
.aura-ring.ar-2{width:140px;height:140px;animation-delay:.6s;opacity:.6}
.aura-ring.ar-3{width:100px;height:100px;animation-delay:1.2s;opacity:.3}
.aura-center{width:64px;height:64px;border-radius:50%;background:linear-gradient(135deg,var(--primary),var(--accent));display:flex;align-items:center;justify-content:center;box-shadow:var(--shadow-primary);position:relative;z-index:2}
.aura-center .i{width:32px;height:32px;color:#fff}
@keyframes auraPulse{0%,100%{transform:scale(1);opacity:.4}50%{transform:scale(1.08);opacity:.15}}
.emotion-core-text blockquote{font-size:1.25rem;font-weight:500;color:var(--text-secondary);font-style:italic;line-height:1.7;max-width:480px;margin:0 auto var(--space-sm)}
.emotion-core-text cite{font-size:.9rem;color:var(--text-tertiary);font-style:normal}

.emotion-cards{display:grid;grid-template-columns:repeat(3,1fr);gap:var(--space-lg)}
.emotion-card{background:var(--bg-card);border:1px solid var(--border-light);border-radius:var(--radius-xl);padding:var(--space-xl);transition:all var(--transition);position:relative;overflow:hidden}
.emotion-card:hover{border-color:var(--primary-lighter);box-shadow:var(--shadow-lg);transform:translateY(-6px)}
.emotion-card::before{content:'';position:absolute;top:0;left:0;right:0;height:4px;background:linear-gradient(90deg,var(--primary),var(--accent));opacity:0;transition:opacity var(--transition)}
.emotion-card:hover::before{opacity:1}
.ec-icon{width:56px;height:56px;border-radius:var(--radius-lg);background:var(--primary-lightest);display:flex;align-items:center;justify-content:center;margin-bottom:var(--space-md);transition:all var(--transition)}
.emotion-card:hover .ec-icon{background:linear-gradient(135deg,var(--primary),var(--accent))}
.ec-icon .i{width:26px;height:26px;transition:all var(--transition)}
.emotion-card:hover .ec-icon .i{color:#fff}
.emotion-card h4{font-size:1.15rem;font-weight:700;color:var(--text);margin-bottom:var(--space-sm)}
.emotion-card p{font-size:.9rem;color:var(--text-tertiary);line-height:1.7;margin-bottom:var(--space-md)}
.ec-tags{display:flex;flex-wrap:wrap;gap:6px}
.ec-tags span{padding:5px 12px;background:var(--primary-lightest);color:var(--primary);font-size:.75rem;font-weight:600;border-radius:20px}

.preview-showcase{display:grid;grid-template-columns:1fr 1fr;gap:var(--space-2xl);align-items:center}
.preview-scroll-wrap{position:relative;overflow-x:auto;overflow-y:hidden;padding-bottom:var(--space-md);scrollbar-width:thin;scrollbar-color:var(--primary-lighter) transparent;-webkit-overflow-scrolling:touch}
.preview-scroll-wrap::-webkit-scrollbar{height:6px}
.preview-scroll-wrap::-webkit-scrollbar-thumb{background:var(--primary-lighter);border-radius:3px}
.preview-scroll-track{display:flex;gap:var(--space-md)}
.preview-scroll-item{flex-shrink:0;width:250px;height:400px;border-radius:var(--radius-lg);overflow:hidden;box-shadow:var(--shadow-md);position:relative;transition:all var(--transition);background:var(--bg-card)}
.preview-scroll-item:hover{box-shadow:var(--shadow-xl);transform:translateY(-4px)}
.preview-scroll-item img{width:250px;height:400px;object-fit:cover;display:block}
.preview-scroll-item span{position:absolute;bottom:0;left:0;right:0;padding:12px 14px;background:linear-gradient(0deg,rgba(0,0,0,.55),transparent);color:#fff;font-size:.85rem;font-weight:600}
.preview-info h3{font-size:1.5rem;font-weight:700;color:var(--text);margin-bottom:var(--space-md)}
.preview-info>p{font-size:1rem;color:var(--text-tertiary);line-height:1.7;margin-bottom:var(--space-lg)}
.preview-list{display:flex;flex-direction:column;gap:var(--space-md)}
.preview-list-item{display:flex;align-items:flex-start;gap:var(--space-md);padding:var(--space-md);border-radius:var(--radius);transition:all var(--transition-fast);border:1px solid transparent}
.preview-list-item:hover{background:var(--primary-lightest);border-color:var(--primary-lighter)}
.preview-list-item .i{width:20px;height:20px;margin-top:2px;flex-shrink:0;color:var(--primary)}
.preview-list-item span{font-size:.94rem;color:var(--text-secondary);font-weight:500}

.download-grid{display:grid;grid-template-columns:repeat(2,280px);gap:var(--space-xl);justify-content:center}
.download-card{text-align:center;padding:var(--space-2xl) var(--space-lg);background:var(--bg-card);border:1px solid var(--border-light);border-radius:var(--radius-lg);position:relative}
.download-icon{width:56px;height:56px;margin:0 auto var(--space-md);border-radius:var(--radius);background:var(--primary-lightest);display:flex;align-items:center;justify-content:center}
.download-icon .i{width:28px;height:28px;color:var(--primary)}
.download-card h3{font-size:1.2rem;font-weight:700;color:var(--text);margin-bottom:var(--space-sm)}
.download-card p{font-size:.9rem;color:var(--text-tertiary);margin-bottom:var(--space-lg);line-height:1.55}
.download-card .btn{width:100%;justify-content:center}
.download-card .btn:hover{transform:none;box-shadow:none;background:var(--primary-lightest)}

.install-notice{display:flex;gap:var(--space-lg);padding:var(--space-xl);background:linear-gradient(135deg,var(--primary-lightest),var(--white));border:1px solid var(--primary-lighter);border-radius:var(--radius-lg);max-width:800px;margin:0 auto}
.notice-icon{width:56px;height:56px;border-radius:50%;background:linear-gradient(135deg,var(--primary),var(--accent));display:flex;align-items:center;justify-content:center;flex-shrink:0;box-shadow:var(--shadow-primary)}
.notice-icon .i{width:28px;height:28px;color:#fff}
.notice-body h3{font-size:1.2rem;font-weight:700;color:var(--text);margin-bottom:var(--space-sm)}
.notice-body p{font-size:.95rem;color:var(--text-secondary);line-height:1.8;margin-bottom:var(--space-sm)}
.notice-body p:last-child{margin-bottom:0}
.highlight{display:inline-block;padding:2px 8px;background:var(--primary-lightest);color:var(--primary);font-weight:700;border-radius:4px;border:1px solid var(--primary-lighter)}

.faq-list{max-width:760px;margin:0 auto;display:flex;flex-direction:column;gap:var(--space-md)}
.faq-item{border:1px solid var(--border-light);border-radius:var(--radius);overflow:hidden;transition:all var(--transition);background:var(--bg-card)}
.faq-item:hover{border-color:var(--primary-lighter);box-shadow:var(--shadow-sm)}
.faq-question{width:100%;display:flex;align-items:center;justify-content:space-between;padding:var(--space-lg);font-size:1rem;font-weight:600;color:var(--text);text-align:left;transition:color var(--transition-fast)}
.faq-question:hover{color:var(--primary)}
.faq-question .i{width:20px;height:20px;transition:transform var(--transition);flex-shrink:0;color:var(--text-muted)}
.faq-item.open .faq-question .i{transform:rotate(180deg)}
.faq-item.open .faq-question{color:var(--primary)}
.faq-answer{max-height:0;overflow:hidden;transition:max-height .4s ease,padding .4s ease}
.faq-item.open .faq-answer{max-height:300px}
.faq-answer p{padding:0 var(--space-lg) var(--space-lg);font-size:.94rem;color:var(--text-tertiary);line-height:1.7}

.footer{background:var(--bg-alt);border-top:1px solid var(--border-light);padding:var(--space-xl) 0}
.footer .container{text-align:center}
.footer p{font-size:.88rem;color:var(--text-tertiary)}

.back-to-top{position:fixed;bottom:32px;right:32px;width:46px;height:46px;border-radius:50%;background:var(--white);border:1px solid var(--border);box-shadow:var(--shadow-md);display:flex;align-items:center;justify-content:center;z-index:800;opacity:0;visibility:hidden;transform:translateY(10px);transition:all var(--transition);cursor:pointer}
.back-to-top.visible{opacity:1;visibility:visible;transform:translateY(0)}
.back-to-top:hover{background:var(--primary);border-color:var(--primary);box-shadow:var(--shadow-primary);transform:translateY(-3px)}
.back-to-top .i{width:20px;height:20px;color:var(--text-secondary)}
.back-to-top:hover .i{color:#fff}

.anim-up{opacity:0;transform:translateY(32px);transition:opacity .6s ease,transform .6s ease}
.anim-up.show{opacity:1;transform:translateY(0)}
.anim-fade{opacity:0;transition:opacity .6s ease}
.anim-fade.show{opacity:1}
.d-1{transition-delay:.08s}.d-2{transition-delay:.16s}.d-3{transition-delay:.24s}
.d-4{transition-delay:.32s}.d-5{transition-delay:.40s}.d-6{transition-delay:.48s}

.i{display:inline-block;width:24px;height:24px;background:currentColor;mask-size:contain;mask-repeat:no-repeat;mask-position:center;-webkit-mask-size:contain;-webkit-mask-repeat:no-repeat;-webkit-mask-position:center;flex-shrink:0}
.i-menu{mask-image:url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' viewBox='0 0 24 24'%3E%3Cline x1='3' y1='6' x2='21' y2='6' stroke='%23000' stroke-width='2' stroke-linecap='round'/%3E%3Cline x1='3' y1='12' x2='21' y2='12' stroke='%23000' stroke-width='2' stroke-linecap='round'/%3E%3Cline x1='3' y1='18' x2='21' y2='18' stroke='%23000' stroke-width='2' stroke-linecap='round'/%3E%3C/svg%3E")}
.i-close{display:none;mask-image:url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' viewBox='0 0 24 24'%3E%3Cline x1='18' y1='6' x2='6' y2='18' stroke='%23000' stroke-width='2' stroke-linecap='round'/%3E%3Cline x1='6' y1='6' x2='18' y2='18' stroke='%23000' stroke-width='2' stroke-linecap='round'/%3E%3C/svg%3E")}
.i-download{mask-image:url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' viewBox='0 0 24 24'%3E%3Cpath d='M21 15v4a2 2 0 01-2 2H5a2 2 0 01-2-2v-4' stroke='%23000' stroke-width='2' fill='none' stroke-linecap='round'/%3E%3Cpolyline points='7 10 12 15 17 10' stroke='%23000' stroke-width='2' fill='none' stroke-linecap='round' stroke-linejoin='round'/%3E%3Cline x1='12' y1='15' x2='12' y2='3' stroke='%23000' stroke-width='2' stroke-linecap='round'/%3E%3C/svg%3E")}
.i-send{mask-image:url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' viewBox='0 0 24 24'%3E%3Cline x1='22' y1='2' x2='11' y2='13' stroke='%23000' stroke-width='2' stroke-linecap='round'/%3E%3Cpolygon points='22 2 15 22 11 13 2 9 22 2' stroke='%23000' stroke-width='2' fill='none' stroke-linecap='round' stroke-linejoin='round'/%3E%3C/svg%3E")}
.i-heart{mask-image:url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' viewBox='0 0 24 24'%3E%3Cpath d='M20.84 4.61a5.5 5.5 0 00-7.78 0L12 5.67l-1.06-1.06a5.5 5.5 0 00-7.78 7.78l1.06 1.06L12 21.23l7.78-7.78 1.06-1.06a5.5 5.5 0 000-7.78z' stroke='%23000' stroke-width='2' fill='none' stroke-linecap='round' stroke-linejoin='round'/%3E%3C/svg%3E")}
.i-user{mask-image:url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' viewBox='0 0 24 24'%3E%3Cpath d='M20 21v-2a4 4 0 00-4-4H8a4 4 0 00-4 4v2' stroke='%23000' stroke-width='2' fill='none' stroke-linecap='round'/%3E%3Ccircle cx='12' cy='7' r='4' stroke='%23000' stroke-width='2' fill='none'/%3E%3C/svg%3E")}
.i-edit{mask-image:url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' viewBox='0 0 24 24'%3E%3Cpath d='M12 20h9' stroke='%23000' stroke-width='2' stroke-linecap='round'/%3E%3Cpath d='M16.5 3.5a2.121 2.121 0 013 3L7 19l-4 1 1-4L16.5 3.5z' stroke='%23000' stroke-width='2' fill='none' stroke-linecap='round' stroke-linejoin='round'/%3E%3C/svg%3E")}
.i-message-square{mask-image:url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' viewBox='0 0 24 24'%3E%3Cpath d='M21 15a2 2 0 01-2 2H7l-4 4V5a2 2 0 012-2h14a2 2 0 012 2z' stroke='%23000' stroke-width='2' fill='none' stroke-linecap='round' stroke-linejoin='round'/%3E%3C/svg%3E")}
.i-shield{mask-image:url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' viewBox='0 0 24 24'%3E%3Cpath d='M12 22s8-4 8-10V5l-8-3-8 3v7c0 6 8 10 8 10z' stroke='%23000' stroke-width='2' fill='none' stroke-linecap='round' stroke-linejoin='round'/%3E%3C/svg%3E")}
.i-check{mask-image:url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' viewBox='0 0 24 24'%3E%3Cpolyline points='20 6 9 17 4 12' stroke='%23000' stroke-width='2' fill='none' stroke-linecap='round' stroke-linejoin='round'/%3E%3C/svg%3E")}
.i-smartphone{mask-image:url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' viewBox='0 0 24 24'%3E%3Crect x='5' y='2' width='14' height='20' rx='2' stroke='%23000' stroke-width='2' fill='none'/%3E%3Cline x1='12' y1='18' x2='12.01' y2='18' stroke='%23000' stroke-width='2' stroke-linecap='round'/%3E%3C/svg%3E")}
.i-chevron-up{mask-image:url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' viewBox='0 0 24 24'%3E%3Cpolyline points='18 15 12 9 6 15' stroke='%23000' stroke-width='2' fill='none' stroke-linecap='round' stroke-linejoin='round'/%3E%3C/svg%3E")}
.i-arrow-up{mask-image:url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' viewBox='0 0 24 24'%3E%3Cline x1='12' y1='19' x2='12' y2='5' stroke='%23000' stroke-width='2' stroke-linecap='round'/%3E%3Cpolyline points='5 12 12 5 19 12' stroke='%23000' stroke-width='2' fill='none' stroke-linecap='round' stroke-linejoin='round'/%3E%3C/svg%3E")}
.menu-toggle.open .i-menu{display:none}
.menu-toggle.open .i-close{display:inline-block}

@media(max-width:1199px){
  :root{--space-4xl:64px;--space-3xl:48px}
  .hero .container{grid-template-columns:1fr;text-align:center}
  .hero-content{order:1;padding-right:0}
  .hero-desc{margin:0 auto var(--space-xl)}
  .hero-actions{justify-content:center}
  .hero-preview{order:0;max-width:480px;margin:0 auto}
  .hero-float-tag{display:none}
  .hero .hero-title{font-size:2.4rem}
  .hero-sub{font-size:1.05rem}
  .emotion-cards{grid-template-columns:repeat(2,1fr)}
  .download-grid{grid-template-columns:repeat(2,240px)}
  .preview-showcase{grid-template-columns:1fr;gap:var(--space-xl)}
  .preview-info{text-align:center}
  .preview-list{max-width:400px;margin:0 auto}
}

@media(max-width:767px){
  :root{--space-4xl:48px;--space-3xl:36px;--space-2xl:28px}
  .container{padding:0 var(--space-md)}
  .nav-links{display:none}
  .menu-toggle{display:flex}
  .navbar{background:#fff;backdrop-filter:none;-webkit-backdrop-filter:none}
  .hero{padding:110px 0 var(--space-3xl)}
  .hero .hero-title{font-size:1.85rem}
  .hero-sub{font-size:1rem}
  .hero-desc{font-size:1rem}
  .hero-actions{flex-direction:column;align-items:center}
  .hero-actions .btn{width:100%;max-width:280px;justify-content:center}
  .section-header h2{font-size:1.55rem}
  .section-header p{font-size:.94rem}
  .emotion-cards{grid-template-columns:1fr}
  .download-grid{grid-template-columns:1fr;max-width:300px;margin:0 auto}
  .preview-showcase{grid-template-columns:1fr}
  .back-to-top{bottom:20px;right:20px;width:40px;height:40px}
  .install-notice{flex-direction:column;align-items:center;text-align:center;padding:var(--space-lg)}
  .notice-icon{margin-bottom:var(--space-md)}
  .notice-body h3{font-size:1.1rem}
  .notice-body p{font-size:.9rem}
  .emotion-aura{width:140px;height:140px}
  .aura-ring.ar-1{width:140px;height:140px}
  .aura-ring.ar-2{width:110px;height:110px}
  .aura-ring.ar-3{width:80px;height:80px}
  .aura-center{width:48px;height:48px}
  .aura-center .i{width:24px;height:24px}
  .emotion-core-text blockquote{font-size:1.05rem}
  .preview-scroll-item{width:200px;height:320px}
  .preview-scroll-item img{width:200px;height:320px}
}

@media(max-width:479px){
  .hero .hero-title{font-size:2.5rem}
  .hero-mockup{max-width:100%}
  .btn{padding:12px 20px;font-size:.88rem}
}