:root{--blue: #0066ff;--orange: #ff8c00;--bg: #f5f7fa;--panel: #ffffff;--text: #333333;--muted: #999999;--line: #e7ebf3;--success: #52c41a;--danger: #ff4d4f;--shadow: 0 18px 40px rgba(0, 57, 166, .08);--radius: 20px;--ease: cubic-bezier(.4, 0, .2, 1)}*{box-sizing:border-box}html{scroll-behavior:smooth}body{margin:0;font-family:Roboto,PingFang SC,Microsoft YaHei,sans-serif;color:var(--text);background:radial-gradient(circle at top right,rgba(0,102,255,.18),transparent 28%),linear-gradient(180deg,#ffffff 0%,var(--bg) 100%)}button,input,select{font:inherit}.app-shell{min-height:100vh;display:grid;grid-template-columns:260px 1fr}.panel{background:var(--panel);border:1px solid rgba(231,235,243,.95);border-radius:var(--radius);box-shadow:var(--shadow)}.sidebar{position:sticky;top:0;height:100vh;padding:24px 18px;background:#ffffffd1;-webkit-backdrop-filter:blur(18px);backdrop-filter:blur(18px);border-right:1px solid rgba(231,235,243,.9)}.brand{display:flex;align-items:center;gap:12px;margin-bottom:28px}.brand-mark{width:42px;height:42px;border-radius:14px;display:grid;place-items:center;color:#fff;font-weight:800;background:linear-gradient(135deg,var(--blue) 0%,#4d9dff 100%);box-shadow:0 12px 24px #0066ff47}.brand strong{font-size:20px}.brand span{display:block;color:var(--muted);font-size:12px}.nav{display:grid;gap:8px}.nav button,.mobile-nav button{border:0;background:transparent;border-radius:14px;padding:14px 16px;text-align:left;cursor:pointer;color:#43506a;transition:background .22s var(--ease),transform .22s var(--ease),color .22s var(--ease)}.nav button:hover,.nav button.active,.mobile-nav button.active{background:#eef4ff;color:var(--blue);transform:translateY(-2px)}.sidebar-card{margin-top:24px;padding:18px;background:linear-gradient(160deg,#0f5fff,#0a3b9e);color:#fff}.sidebar-card small{opacity:.82}.sidebar-card strong{display:block;margin:10px 0 8px;font-size:28px}.sidebar-card p{margin:0;color:#ffffffe0;line-height:1.6}.main{padding:22px}.topbar{display:flex;justify-content:space-between;align-items:center;gap:16px;margin-bottom:20px}.search{flex:1;display:flex;align-items:center;gap:10px;padding:0 16px;min-height:52px;border:1px solid var(--line);background:#ffffffe0;border-radius:16px;box-shadow:0 10px 24px #12244c0a}.search input{flex:1;border:0;outline:0;background:transparent}.primary-btn,.ghost-btn{min-height:48px;border-radius:14px;padding:0 18px;border:0;cursor:pointer;transition:transform .22s var(--ease),box-shadow .22s var(--ease),background .22s var(--ease)}.primary-btn:hover,.ghost-btn:hover{transform:translateY(-2px)}.primary-btn{background:var(--orange);color:#fff;box-shadow:0 12px 22px #ff8c0047}.primary-btn.light{background:#fff;color:var(--blue);box-shadow:none}.ghost-btn{background:#eef4ff;color:var(--blue)}.ghost-btn.inverse{background:#ffffff24;color:#fff;border:1px solid rgba(255,255,255,.22)}.page{animation:fadeIn .3s var(--ease)}@keyframes fadeIn{0%{opacity:0;transform:translateY(8px)}to{opacity:1;transform:translateY(0)}}.hero-grid,.feature-grid,.stats-grid,.share-grid,.profile-grid{display:grid;gap:16px}.hero-grid{grid-template-columns:1.2fr .8fr;margin-bottom:18px}.feature-grid{grid-template-columns:repeat(3,minmax(0,1fr))}.stats-grid{grid-template-columns:repeat(4,minmax(0,1fr));margin:16px 0}.share-grid,.profile-grid{grid-template-columns:repeat(2,minmax(0,1fr));margin-bottom:16px}.hero{padding:34px;background:radial-gradient(circle at top right,rgba(255,255,255,.25),transparent 30%),linear-gradient(135deg,#06f,#2e83ff 52%,#6db3ff);color:#fff}.hero h1{margin:0 0 14px;font-size:42px;line-height:1.1}.hero p{margin:0 0 22px;color:#ffffffe0;max-width:580px;line-height:1.7}.hero-eyebrow{display:inline-flex;padding:8px 12px;border-radius:999px;background:#ffffff24;margin-bottom:16px;font-size:13px}.hero-actions{display:flex;gap:12px;flex-wrap:wrap}.guide{padding:24px;display:flex;flex-direction:column;justify-content:space-between}.guide-badge{display:inline-flex;padding:8px 12px;border-radius:999px;color:var(--orange);background:#fff7eb;font-size:13px;width:fit-content}.guide h2,.section-title h2,.card-block h3,.feature-card h3{margin:14px 0 10px}.guide p,.section-title p,.feature-card p,.card-block p{margin:0;color:var(--muted);line-height:1.7}.dropzone{margin-top:18px;border:2px dashed #a9c8ff;border-radius:18px;padding:26px;text-align:center;background:linear-gradient(180deg,#f8fbff,#eff5ff);transition:border-color .22s var(--ease),transform .22s var(--ease)}.dropzone:hover{transform:translateY(-2px);border-color:var(--blue)}.dropzone-icon{font-size:42px;margin-bottom:8px}.dropzone span{display:block;margin-top:8px;color:var(--muted)}.section-title{display:flex;justify-content:space-between;align-items:center;gap:12px;margin:22px 0 14px}.feature-card,.stat-card,.card-block,.upload-list,.toolbar{padding:22px}.feature-icon{width:48px;height:48px;border-radius:16px;display:grid;place-items:center;font-size:24px;background:#eef4ff;margin-bottom:14px}.upload-list{display:grid;gap:10px}.upload-item{padding:14px 16px;border-radius:16px;background:#f8fbff;border:1px solid #edf2fa}.upload-meta{display:flex;justify-content:space-between;align-items:center;gap:12px;margin-bottom:10px;font-size:14px}.progress-track{height:12px;border-radius:999px;background:#edf2f7;overflow:hidden}.progress-bar{height:100%;border-radius:inherit;background:linear-gradient(90deg,var(--blue) 0%,#54a7ff 100%);position:relative}.progress-bar:after{content:"";position:absolute;top:0;right:0;bottom:0;left:0;background:linear-gradient(120deg,transparent 0%,rgba(255,255,255,.35) 50%,transparent 100%);animation:shimmer 1.6s infinite linear}.progress-bar.error{background:linear-gradient(90deg,#ff7a7a 0%,var(--danger) 100%)}@keyframes shimmer{0%{transform:translate(-100%)}to{transform:translate(100%)}}.toolbar{display:flex;gap:12px;flex-wrap:wrap;margin-bottom:14px}.inline-search{min-width:240px;flex:1}.toolbar-actions{display:flex;gap:10px}.table-wrap{overflow:hidden}table{width:100%;border-collapse:collapse}th,td{padding:16px 18px;border-bottom:1px solid var(--line);text-align:left;font-size:14px}th{color:#667085;font-weight:600;background:#fbfcfe}tbody tr:hover{background:#fafcff}.tag{display:inline-flex;align-items:center;padding:7px 10px;border-radius:999px;font-size:12px;font-weight:700;background:#eef4ff;color:var(--blue)}.share-tag.password{background:#fff6ea;color:var(--orange)}.share-tag.public{background:#ebf9f1;color:var(--success)}.share-tag.expire{background:#fff1f0;color:var(--danger)}.stat-card span{display:block;color:var(--muted);font-size:13px}.stat-card strong{display:block;margin-top:10px;font-size:30px;color:var(--blue)}.form-stack{display:grid;gap:12px;margin-top:14px}.form-stack label{display:grid;gap:6px;color:#4d5871}.form-stack input,.form-stack select{min-height:46px;border:1px solid var(--line);border-radius:12px;padding:0 12px;background:#fff}.help{display:inline-flex;width:18px;height:18px;align-items:center;justify-content:center;border-radius:999px;background:#eef4ff;color:var(--blue);font-size:12px;font-weight:700}.share-box{margin-top:16px;padding:12px 14px;border-radius:14px;background:#f7f9fc;word-break:break-all}.share-actions{display:flex;justify-content:space-between;align-items:center;gap:12px;margin-top:16px}.share-type{color:var(--orange);font-weight:700}.usage-row{display:flex;justify-content:space-between;align-items:center;gap:12px;margin-bottom:14px}.usage-list{list-style:none;padding:0;margin:16px 0 0;display:grid;gap:12px}.usage-list li{display:flex;justify-content:space-between;align-items:center}.mobile-nav{display:none;position:fixed;left:12px;right:12px;bottom:12px;padding:10px;border-radius:18px;background:#ffffffeb;-webkit-backdrop-filter:blur(18px);backdrop-filter:blur(18px);border:1px solid rgba(231,235,243,.95);box-shadow:0 12px 30px #1322441f;z-index:20;grid-template-columns:repeat(4,1fr);gap:8px}.mobile-nav button{min-height:48px;text-align:center}.toast{position:fixed;top:20px;right:20px;min-width:220px;max-width:320px;padding:14px 16px;border-radius:16px;color:#fff;box-shadow:0 16px 30px #00000029;transform:translateY(-16px);opacity:0;pointer-events:none;transition:opacity .22s var(--ease),transform .22s 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