:root{font-family:Inter,"Microsoft YaHei", "PingFang SC",system-ui,sans-serif;color:#191a3b;background:#f7f8ff;font-size:14px;--purple:#7545ef;--purple2:#956bf6;--line:#e8e7f5;--muted:#9293ad;--violet:#efebff;--shadow:0 6px 24px rgba(53,43,127,.065)}*{box-sizing:border-box}body{margin:0}a{text-decoration:none;color:inherit}button,input,select,textarea{font:inherit}button{cursor:pointer}button:disabled{opacity:.52;cursor:not-allowed}h1,h2,h3,p{margin:0}#app{min-height:100vh}.layout{display:grid;grid-template-columns:220px minmax(0,1fr);min-height:100vh}.sidebar{background:#fff;border-right:1px solid var(--line);display:flex;flex-direction:column;padding:27px 13px;gap:30px}.brand{display:flex;align-items:center;gap:12px;padding:2px 13px}.brand-logo{width:52px;height:52px;background:linear-gradient(140deg,#f0ecff,#e0d8ff);color:var(--purple);border-radius:17px;display:grid;place-items:center;font-size:32px;line-height:1}.brand b{font-size:20px;white-space:nowrap}.brand small{display:block;color:#9da0b6;font-size:11px;margin-top:4px;letter-spacing:.4px}.nav{display:grid;gap:7px}.nav button{border:0;background:none;color:#4d4f70;text-align:left;padding:15px 16px;border-radius:12px;display:flex;align-items:center;gap:13px;font-weight:600;width:100%}.nav button.active,.nav button:hover{background:#ede7ff;color:#6b39f0}.nav .nav-icon{font-size:20px;width:23px;text-align:center}.sidebar-bottom{margin-top:auto;color:#8588ac;padding:15px 23px;font-size:12px;line-height:1.8}.sidebar-bottom .cloud{font-size:55px;color:#c2b3ff}.sidebar-bottom strong{display:block;color:#494c7d;font-size:14px}.sidebar-bottom small{display:block;margin-top:20px;color:#a7a5c0}.main{min-width:0}.topbar{height:74px;background:#fff;border-bottom:1px solid var(--line);display:flex;align-items:center;justify-content:space-between;padding:0 30px;gap:20px}.topbar h2{font-size:21px;letter-spacing:.5px}.topbar h2:after{content:'';display:block;background:#8350f6;width:31px;height:3px;border-radius:3px;margin-top:8px}.top-search{flex:1;max-width:560px}.top-search input{width:100%;border:1px solid #e3e0f6;border-radius:12px;padding:13px 17px;background:#fff;outline:0}.top-search input:focus,.field input:focus,.field select:focus,.field textarea:focus{border-color:#8d62f7;box-shadow:0 0 0 3px #eee8ff}.top-user{display:flex;align-items:center;gap:12px;font-weight:600;white-space:nowrap}.avatar{width:36px;height:36px;border-radius:50%;background:#e7e4ff;color:#7765c8;display:grid;place-items:center;font-size:21px}.main-content{max-width:1680px;margin:auto;padding:24px 28px 52px}.hero{min-height:206px;border-radius:18px;color:#fff;background:linear-gradient(108deg,#292054 0%,#50449b 48%,#8d77ea 100%);position:relative;overflow:hidden;display:flex;justify-content:space-between;align-items:center;padding:34px 50px}.hero .eyebrow{letter-spacing:3px;font-size:12px;color:#cfc5ff;font-weight:700}.hero h1{font-size:32px;margin:12px 0 14px;letter-spacing:1px}.hero p{color:#eee9ff;font-size:14px}.hero .features{display:flex;gap:20px;margin-top:25px;font-size:12px;color:#f5f1ff}.hero-art{width:280px;min-width:230px;text-align:center;font-size:105px;color:#f2e9ff;filter:drop-shadow(0 16px 19px rgba(38,19,114,.24));transform:translateY(12px)}.hero-art:after{content:'';display:block;width:210px;height:26px;margin:-12px auto 0;border-radius:50%;background:#b7a4ff55}.workspace{display:grid;grid-template-columns:minmax(0,1fr) 285px;gap:20px;margin-top:20px}.toolbar{display:flex;align-items:center;gap:9px;flex-wrap:wrap;margin-bottom:18px}.btn{border-radius:10px;border:1px solid #dedaf3;background:#fff;color:#454466;padding:11px 17px;font-weight:650;box-shadow:0 2px 7px #27175b08}.btn:hover{border-color:#9473ef}.btn.primary{background:linear-gradient(125deg,#9469f6,#6633e0);color:#fff;border:0;box-shadow:0 5px 10px #6f45ea29}.btn.ghost{background:#f5f2ff;color:#7141e8;border-color:#efeaff}.btn.danger{color:#db4966}.btn.small{padding:7px 10px;font-size:12px}.toolbar-end{margin-left:auto;display:flex;gap:8px}.panel{background:#fff;border:1px solid #efedf8;border-radius:17px;box-shadow:var(--shadow)}.file-panel{overflow:hidden;min-height:405px}.file-table-wrap{overflow-x:auto}.file-table{width:100%;border-collapse:collapse;white-space:nowrap;font-size:12px}.file-table th{background:#fbfbff;color:#72758f;font-weight:650;text-align:left;padding:15px 13px;border-bottom:1px solid var(--line)}.file-table td{padding:14px 13px;border-bottom:1px solid #f1eff8;vertical-align:middle;color:#505270}.file-table tr:hover td{background:#fbfaff}.file-table input[type=checkbox]{accent-color:var(--purple)}.file-name{display:flex;align-items:center;gap:10px;min-width:220px;color:#21233f;font-weight:700;cursor:pointer}.file-name small{display:block;font-weight:400;color:#a1a2b9;margin-top:4px;max-width:230px;overflow:hidden;text-overflow:ellipsis}.file-ico{width:36px;height:40px;flex:none;border-radius:8px;display:grid;place-items:center;font-weight:800;color:white;font-size:11px;background:#8e74ea}.file-ico.folder{background:#ffbc4c;font-size:23px}.file-ico.apk{background:linear-gradient(#78cc53,#3cab50)}.file-ico.zip{background:linear-gradient(#ffc84f,#f58b18)}.file-ico.pdf{background:linear-gradient(#ff7670,#ec394e)}.file-ico.exe{background:linear-gradient(#70a9ff,#4478e5)}.file-ico.img{background:linear-gradient(#c49dfb,#945cf0)}.tag{display:inline-flex;align-items:center;border-radius:50px;background:#f0ecff;color:#7650d6;padding:5px 10px;font-size:11px}.tag.green{background:#e5f8ee;color:#268a5c}.action-link{border:0;background:none;color:#7847ed;font-weight:650;padding:6px 3px;font-size:12px}.action-link:hover{text-decoration:underline}.table-foot{padding:20px;display:flex;justify-content:space-between;align-items:center;color:#8589a4;font-size:12px}.right-stack{display:grid;gap:15px;align-content:start}.right-box{padding:20px}.right-box h3{font-size:16px;margin-bottom:15px}.right-box p,.right-box small{color:#9597ae;font-size:12px;line-height:1.75}.mini-row{display:flex;justify-content:space-between;gap:8px;align-items:center;padding:11px 0;border-bottom:1px solid #f2effb;font-size:12px}.mini-row:last-child{border:0}.mini-row button{border:0;background:none;color:#6a41dc;cursor:pointer}.storage-bar{height:9px;background:#e8e4f7;border-radius:20px;margin:13px 0;overflow:hidden}.storage-fill{height:100%;background:linear-gradient(90deg,#7142e6,#a985ff);border-radius:20px}.muted{color:#999cb5}.empty{padding:80px 15px;text-align:center;color:#9a9fb8}.empty .empty-icon{font-size:50px;color:#b9a8f4;margin-bottom:12px}.empty h3{color:#555979;margin-bottom:9px}.modal-bg{position:fixed;inset:0;z-index:20;background:#25175180;display:grid;place-items:center;padding:24px;overflow:auto}.modal{background:#fff;border-radius:23px;box-shadow:0 26px 65px #0f0d3940;width:min(1020px,100%);max-height:92vh;overflow:auto;padding:30px}.modal.narrow{max-width:510px}.modal-head{display:flex;justify-content:space-between;align-items:center;margin-bottom:20px}.modal-head h2{font-size:24px}.close{border:none;background:none;font-size:24px;color:#7f7a9e}.share-grid{display:grid;grid-template-columns:1fr 1fr;gap:20px}.modal-pane{border:1px solid #ebe6fa;border-radius:18px;padding:20px;background:#fff}.modal-pane h3{margin-bottom:17px}.field{margin:14px 0}.field label{display:block;font-size:13px;font-weight:650;color:#494965;margin-bottom:9px}.field input,.field select,.field textarea{width:100%;padding:12px 13px;border:1px solid #dedaf0;border-radius:10px;outline:0;background:#fff;color:#282742}.radio-row{display:flex;gap:8px;flex-wrap:wrap}.radio-opt{display:inline-flex;gap:5px;align-items:center;border:1px solid #e4def5;padding:10px 12px;border-radius:10px;cursor:pointer;font-size:12px}.radio-opt:has(input:checked){color:#713bec;border-color:#a285fd;background:#f4efff}.radio-opt input{accent-color:#753de9}.share-result{padding:18px;background:#f5f2ff;border-radius:13px;overflow-wrap:anywhere;line-height:1.9}.share-preview{padding:20px;background:linear-gradient(#ece6ff,#fff);border-radius:15px;margin-top:15px;text-align:center}.gate-page{min-height:100vh;background:radial-gradient(ellipse at 25% 5%,#ebe8ff 0%,transparent 48%),radial-gradient(ellipse at 90% 100%,#e7e1ff,transparent 35%),#f9f9ff;display:flex;flex-direction:column;padding:25px clamp(25px,5vw,90px)}.gate-brand{display:flex;gap:12px;align-items:center;font-size:22px;font-weight:800}.gate-card{display:grid;grid-template-columns:1fr 1.23fr;background:#fff;border-radius:32px;overflow:hidden;max-width:1160px;width:100%;margin:auto;box-shadow:0 20px 65px #6a52cb21}.gate-art{background:linear-gradient(125deg,#5140b7,#956df2);padding:70px 55px;color:#fff;min-height:530px;display:flex;flex-direction:column;justify-content:space-between}.gate-art h1{font-size:38px;margin:16px 0}.gate-art p{color:#efeaff}.big-cloud{font-size:150px;text-align:center;filter:drop-shadow(0 18px 22px #4022a059)}.gate-form{padding:60px 60px;display:flex;flex-direction:column;justify-content:center}.gate-form h1{font-size:32px;margin:12px 0}.gate-form p{color:#9191aa;margin:4px 0 25px}.gate-info{background:#f2efff;padding:15px 18px;color:#7064ae;border-radius:12px;font-size:12px}.gate-form .field{margin:27px 0 10px}.gate-form .btn{padding:16px}.gate-footer{text-align:center;color:#a29abc;font-size:12px;margin-top:auto}.gate-form .help{margin:19px 0;color:#8784a6}.dashboard-cards{display:grid;grid-template-columns:repeat(5,1fr);gap:13px;margin-bottom:20px}.metric{padding:23px 20px}.metric .symbol{font-size:29px;color:#7547ec}.metric p{font-size:12px;color:#8587a0;margin:10px 0}.metric strong{font-size:28px}.dashboard-grid{display:grid;grid-template-columns:minmax(0,1.5fr) minmax(260px,1fr);gap:17px}.dash-panel{padding:22px}.dash-panel h3{font-size:17px;margin-bottom:18px}.bars{display:flex;align-items:flex-end;height:220px;gap:10px;border-bottom:1px solid #e8e4f5}.bar-column{flex:1;height:100%;display:flex;align-items:flex-end;gap:2px}.bar-column>i{display:block;flex:1;background:#8053f1;border-radius:5px 5px 0 0;min-height:2px}.bar-column>i:last-child{background:#c7b1ff}.chart-labels{display:flex;justify-content:space-around;color:#9b99b4;font-size:10px;margin-top:9px}.activity-item{display:grid;grid-template-columns:140px minmax(0,1fr) 65px;gap:12px;padding:12px;border-bottom:1px solid #f1eff7;font-size:12px}.activity-item span{overflow:hidden;text-overflow:ellipsis;white-space:nowrap}.status-dot{color:#6d3deb}.overlay-message{background:#faf8ff;padding:15px;border-radius:12px;font-size:12px;color:#6b6691}.upload-drop{border:2px dashed #bca4ff;border-radius:13px;padding:36px;text-align:center;background:#faf8ff;cursor:pointer}.upload-drop strong{display:block;margin:10px}.upload-drop:hover{background:#f2edff}.progress{height:9px;border-radius:9px;background:#eee9ff;overflow:hidden}.progress>i{height:100%;background:#7750ec;display:block;width:0}.upload-item{padding:13px 0;border-bottom:1px solid var(--line)}.upload-item small{color:#999}.admin-header{display:flex;justify-content:space-between;align-items:center;margin-bottom:20px}.login-control{display:flex;align-items:center;gap:8px}.checkbox{accent-color:#7742ed}#toast{position:fixed;z-index:40;bottom:26px;left:50%;transform:translateX(-50%);background:#282046;color:#fff;padding:12px 23px;border-radius:12px;box-shadow:0 10px 24px #281a6244;opacity:0;pointer-events:none;transition:opacity .2s}#toast.on{opacity:1}.mobile-toggle{display:none}.admin-hint{color:#9b9cb3}.share-recipient{max-width:650px;margin:70px auto}.share-recipient .panel{padding:40px;text-align:center}.share-recipient .file-ico{margin:18px auto}.share-recipient h1{font-size:25px;overflow-wrap:anywhere}.share-recipient p{color:#9c9eb1;line-height:2;margin:12px 0}.form-error{color:#d14d6b;font-size:12px;margin:12px 0}.secret-row{display:flex;gap:8px}.secret-row input{flex:1}.pill-purple{display:inline-flex;align-items:center;background:#f1eaff;color:#7c48e9;border-radius:40px;padding:7px 11px;font-size:12px}.help-text{font-size:12px;color:#9294af;line-height:1.9}.skip-link{background:transparent;border:0;color:#8d74de;font-size:12px;margin-top:20px}
@media(max-width:1250px){.workspace{grid-template-columns:1fr}.right-stack{grid-template-columns:repeat(2,minmax(0,1fr))}.dashboard-cards{grid-template-columns:repeat(3,1fr)}.hero-art{width:150px;min-width:150px}}@media(max-width:800px){.layout{grid-template-columns:1fr}.sidebar{position:fixed;z-index:12;top:0;bottom:0;width:230px;left:-240px;transition:left .2s;box-shadow:0 0 25px #12123425}.sidebar.open{left:0}.mobile-toggle{display:inline-flex}.topbar{height:65px;padding:0 14px}.top-search{display:none}.topbar h2{font-size:17px}.main-content{padding:15px 12px 45px}.hero{min-height:160px;padding:25px}.hero h1{font-size:21px}.hero-art{display:none}.hero .features{gap:8px;font-size:10px;flex-wrap:wrap}.right-stack{grid-template-columns:1fr}.dashboard-cards{grid-template-columns:repeat(2,1fr)}.dashboard-grid,.share-grid{grid-template-columns:1fr}.modal-bg{padding:8px}.modal{padding:17px;max-height:97vh}.gate-page{padding:18px}.gate-card{display:block;margin:45px auto}.gate-art{min-height:170px;padding:24px}.big-cloud{display:none}.gate-art h1{font-size:25px}.gate-form{padding:30px 22px}.gate-form h1{font-size:24px}.activity-item{grid-template-columns:95px 1fr 50px}.toolbar-end{margin-left:0}}@media(max-width:490px){.dashboard-cards{grid-template-columns:1fr 1fr}.metric{padding:13px}.metric strong{font-size:20px}.top-user{font-size:11px}.btn{padding:10px 11px}.toolbar{gap:7px}}
/* Illustration fragments are sourced from the user-approved BIU visual mockups. */
.hero-art{font-size:0;width:380px;min-width:340px;height:180px;background:url('/assets/cloud-hero.png') center / contain no-repeat;filter:none;transform:none}.hero-art:after{display:none}.big-cloud{font-size:0;height:240px;background:url('/assets/cloud-gate.png') center / contain no-repeat;filter:none}
@media(max-width:1250px){.hero-art{min-width:200px;width:220px}}@media(max-width:800px){.hero-art{display:none}.big-cloud{display:none}}