:root { font-family: "Microsoft YaHei", "PingFang SC", system-ui, sans-serif; color: #1d3028; background: #f6f8f6; }
    * { box-sizing: border-box; }
    body { margin: 0; }
    [hidden] { display: none !important; }
    button, input { font: inherit; }
    button { cursor: pointer; }
    svg { width: 20px; height: 20px; stroke: currentColor; fill: none; stroke-width: 1.8; stroke-linecap: round; stroke-linejoin: round; flex: none; }
    .app { min-height: 100vh; display: grid; grid-template-columns: 250px minmax(0, 1fr); }
    .sidebar { background: #fff; border-right: 1px solid #e9eeea; padding: 27px 18px 23px; display: flex; flex-direction: column; gap: 31px; }
    .brand { display: flex; align-items: center; gap: 12px; padding: 0 9px; }
    .brand-mark { width: 41px; height: 41px; border-radius: 13px; display: grid; place-items: center; color: white; background: #249766; box-shadow: 0 8px 18px #2d9d6b30; }
    .brand-mark svg { width: 25px; height: 25px; }
    .brand strong { display: block; font-size: 17px; letter-spacing: .01em; }
    .brand small { display: block; color: #8b9a91; font-size: 11px; margin-top: 2px; }
    .menu-label { color: #a2afa6; font-size: 11px; font-weight: 700; letter-spacing: .12em; padding: 0 14px; margin-bottom: 9px; }
    .nav { display: grid; gap: 4px; }
    .nav button { border: 0; background: transparent; width: 100%; text-align: left; color: #75877c; display: flex; align-items: center; gap: 13px; padding: 12px 15px; border-radius: 11px; font-size: 14px; }
    .nav button:hover, .nav button.active { color: #188b5b; background: #eaf7ef; }
    .nav button.active { font-weight: 700; }
    .nav button svg { width: 18px; height: 18px; }
    .nav .break { height: 12px; }
    .sidebar-bottom { margin-top: auto; }
    .storage-side { background: #f5faf6; border: 1px solid #e5f0e8; border-radius: 15px; padding: 17px; }
    .storage-side .row, .storage-head { display: flex; align-items: center; justify-content: space-between; }
    .storage-side .row strong { font-size: 13px; }
    .storage-side .row span { color: #208b58; font-size: 11px; font-weight: 800; }
    .progress { height: 7px; border-radius: 10px; background: #deebe1; overflow: hidden; margin: 15px 0 10px; }
    .progress i { display: block; height: 100%; width: 74.4%; background: #2caf74; border-radius: inherit; }
    .storage-side p { color: #829188; font-size: 11px; margin: 0; }
    .sidebar-footer { display: flex; align-items: center; gap: 10px; padding: 21px 7px 0; color: #76877b; font-size: 12px; }
    .avatar { width: 31px; height: 31px; border-radius: 50%; background: #e3f3e8; color: #269563; display: grid; place-items: center; font-weight: 800; }
    .main { min-width: 0; }
    .topbar { height: 86px; display: flex; align-items: center; justify-content: space-between; gap: 20px; padding: 0 42px; border-bottom: 1px solid #e9eeea; background: #fff; }
    .breadcrumb { color: #88998d; font-size: 13px; white-space: nowrap; }
    .breadcrumb b { color: #2a4535; font-weight: 650; }
    .top-actions { display: flex; align-items: center; gap: 18px; }
    .search { width: min(345px, 33vw); height: 40px; display: flex; align-items: center; gap: 10px; padding: 0 13px; border: 1px solid #e7eee9; border-radius: 10px; background: #f8faf8; color: #91a096; }
    .search svg { width: 17px; height: 17px; }
    .search input { border: 0; outline: 0; min-width: 0; width: 100%; background: transparent; color: #2a4033; font-size: 13px; }
    .search input::placeholder { color: #a5b1a9; }
    .preview-pill { border: 1px solid #e0eee4; color: #248d5e; background: #f1faf3; border-radius: 30px; padding: 7px 11px; font-size: 11px; white-space: nowrap; font-weight: 700; }
    .content { max-width: 1360px; margin: 0 auto; padding: 36px 42px 52px; }
    .heading { margin-bottom: 23px; }
    .heading h1 { margin: 0 0 7px; font-size: 27px; letter-spacing: -.03em; }
    .heading p { margin: 0; color: #92a198; font-size: 13px; }
    .hero { min-height: 218px; border-radius: 19px; background: linear-gradient(111deg,#e8f6eb 0%,#eef8ed 55%,#f4f9ed 100%); border: 1px solid #e2efdf; position: relative; overflow: hidden; display: flex; justify-content: space-between; gap: 30px; padding: 34px 38px; }
    .hero:after { content: ""; width: 350px; height: 350px; border: 1px solid #d8ead9; border-radius: 50%; position: absolute; right: 88px; top: -197px; box-shadow: 0 0 0 40px #e8f4e533,0 0 0 82px #e8f4e533; pointer-events: none; }
    .hero-copy { position: relative; z-index: 1; }
    .eyebrow { color: #398b60; font-size: 11px; font-weight: 800; letter-spacing: .16em; margin-bottom: 13px; }
    .hero h2 { margin: 0; font-size: 27px; letter-spacing: -.035em; font-weight: 750; }
    .hero p { color: #718779; margin: 10px 0 23px; font-size: 13px; }
    .hero-buttons { display: flex; gap: 10px; flex-wrap: wrap; }
    .btn { height: 40px; display: inline-flex; align-items: center; justify-content: center; gap: 8px; border-radius: 9px; padding: 0 16px; font-size: 12px; font-weight: 700; }
    .btn svg { width: 16px; height: 16px; }
    .btn.primary { background: #249766; border: 1px solid #249766; color: white; box-shadow: 0 5px 12px #24976628; }
    .btn.secondary { background: #fff9; border: 1px solid #d4e8d7; color: #367a55; }
    .usage { width: 252px; flex: none; background: #ffffffed; border: 1px solid #e5efe5; border-radius: 15px; box-shadow: 0 12px 28px #326b4012; padding: 20px; position: relative; z-index: 1; align-self: center; display: flex; align-items: center; gap: 17px; }
    .ring { width: 74px; height: 74px; border-radius: 50%; background: conic-gradient(#34a76c 0 74.4%, #e8f1e8 74.4% 100%); display: grid; place-items: center; flex: none; }
    .ring:before { content: ""; width: 57px; height: 57px; border-radius: 50%; background: #fff; grid-area: 1/1; }
    .ring span { grid-area: 1/1; z-index: 1; font-size: 12px; font-weight: 800; color: #338d5c; }
    .usage small { color: #8a9c8e; font-size: 11px; white-space: nowrap; }
    .usage strong { display: block; font-size: 16px; margin: 4px 0 1px; white-space: nowrap; }
    .usage em { display: block; font-style: normal; color: #91a095; font-size: 10px; white-space: nowrap; }
    .status-strip { display: flex; align-items: center; gap: 12px; padding: 14px 18px; margin-top: 15px; border: 1px solid #e5eee6; background: #fff; border-radius: 12px; color: #677e6d; font-size: 12px; }
    .status-strip svg { width: 18px; height: 18px; color: #2b9b65; }
    .status-strip strong { color: #315341; }
    .status-strip .status-time { margin-left: auto; color: #9bab9e; white-space: nowrap; font-size: 11px; }
    .policy { display: flex; align-items: center; gap: 15px; padding: 18px 20px; margin-top: 18px; border: 1px solid #e5eee6; background: #fff; border-radius: 14px; }
    .policy-icon { width: 42px; height: 42px; border-radius: 11px; display: grid; place-items: center; flex: none; color: #319767; background: #eaf6ed; }
    .policy strong { display: block; font-size: 13px; margin-bottom: 5px; }
    .policy p { color: #8b9b8f; font-size: 11px; margin: 0; line-height: 1.5; }
    .policy-badge { margin-left: auto; color: #25875c; background: #eef8f0; border-radius: 30px; padding: 7px 11px; font-size: 11px; font-weight: 800; white-space: nowrap; }
    .disk-alert { display: none; align-items: center; gap: 11px; background: #fff2e9; border: 1px solid #f7d6be; color: #9d5427; border-radius: 12px; padding: 13px 17px; margin-top: 15px; font-size: 12px; }
    .disk-alert strong { color: #8d421a; }
    .disk-alert svg { width: 18px; height: 18px; }
    .btn:disabled { cursor: not-allowed; opacity: .55; box-shadow: none; }
    body.low-space .disk-alert { display: flex; }
    body.low-space .usage { border-color: #f1d6c2; }
    body.low-space .ring { background: conic-gradient(#d87940 0 11.8%, #f8e8dc 11.8% 100%); }
    body.low-space .ring span, body.low-space .storage-side .row span { color: #bc6634; }
    body.low-space .progress i { background: #d87940; width: 11.8%; }
    body.low-space .status-strip svg { color: #d87940; }
    .section { margin-top: 30px; }
    .section-head { display: flex; justify-content: space-between; align-items: center; gap: 12px; margin-bottom: 17px; }
    .section-head h3 { margin: 0; font-size: 17px; }
    .section-head span { color: #9aa99e; font-size: 12px; }
    .folders { display: grid; grid-template-columns: repeat(4,minmax(0,1fr)); gap: 14px; }
    .folder { min-width: 0; background: #fff; border: 1px solid #e9efea; border-radius: 14px; padding: 20px; box-shadow: 0 5px 15px #1b443b04; }
    .folder-icon { width: 42px; height: 42px; display: grid; place-items: center; border-radius: 11px; margin-bottom: 19px; }
    .folder-icon svg { width: 22px; height: 22px; }
    .folder:nth-child(1) .folder-icon { background: #eaf4ff; color: #6095cc; }
    .folder:nth-child(2) .folder-icon { background: #eaf7ed; color: #43a36b; }
    .folder:nth-child(3) .folder-icon { background: #fff2e5; color: #d49950; }
    .folder:nth-child(4) .folder-icon { background: #f1ecfb; color: #9b7cc8; }
    .folder strong { display: block; font-size: 13px; margin-bottom: 5px; white-space: nowrap; overflow: hidden; text-overflow: ellipsis; }
    .folder small { color: #9aa89e; font-size: 11px; }
    .files { background: #fff; border: 1px solid #e9efea; border-radius: 16px; overflow: hidden; }
    .files-top { display: flex; align-items: center; justify-content: space-between; gap: 15px; padding: 22px 23px 17px; }
    .files-top h3 { margin: 0; font-size: 17px; }
    .files-top p { margin: 5px 0 0; color: #a2afa5; font-size: 11px; }
    .view-toggle { display: flex; align-items: center; gap: 6px; color: #789083; background: #f5f8f5; border-radius: 8px; padding: 5px 8px; font-size: 11px; }
    .view-toggle svg { width: 14px; height: 14px; }
    .file-head, .file-row { display: grid; grid-template-columns: minmax(220px,1.8fr) 80px 100px 110px 65px 28px; align-items: center; gap: 12px; padding: 0 23px; }
    .file-head { height: 38px; background: #f9fbf9; border-top: 1px solid #edf1ed; border-bottom: 1px solid #edf1ed; color: #a0aea3; font-size: 11px; }
    .file-row { height: 67px; border-bottom: 1px solid #f0f3f0; color: #84958a; font-size: 12px; }
    .file-row:last-of-type { border-bottom: 0; }
    .expiry { display: inline-block; width: fit-content; background: #edf7ef; color: #338b5f; border-radius: 20px; padding: 5px 9px; font-size: 11px; white-space: nowrap; }
    .expiry.soon { background: #fff2e6; color: #c47934; }
    .file-name { min-width: 0; display: flex; align-items: center; gap: 13px; color: #293d31; font-weight: 650; }
    .file-name span:last-child { overflow: hidden; text-overflow: ellipsis; white-space: nowrap; }
    .file-icon { width: 37px; height: 37px; border-radius: 9px; display: grid; place-items: center; flex: none; }
    .file-icon svg { width: 18px; height: 18px; }
    .file-icon.image { color: #6595c5; background: #eaf3fd; }
    .file-icon.document { color: #7196ca; background: #eef3fc; }
    .file-icon.video { color: #bc81a5; background: #f9edf4; }
    .file-icon.archive { color: #ca9c61; background: #fcf2e7; }
    .dots { border: 0; background: transparent; color: #a4b3a7; display: grid; place-items: center; padding: 4px; }
    .dots svg { width: 17px; height: 17px; }
    .empty { display: none; padding: 30px; text-align: center; color: #91a295; font-size: 13px; }
    .hint { color: #a7b2a9; font-size: 11px; margin: 14px 2px 0; }
    .toast { position: fixed; bottom: 25px; left: 50%; transform: translate(-50%,15px); background: #244334; color: #fff; border-radius: 10px; padding: 12px 18px; font-size: 13px; opacity: 0; pointer-events: none; transition: .2s; box-shadow: 0 10px 30px #24433435; z-index: 5; }
    .toast.show { opacity: 1; transform: translate(-50%,0); }
    .upload-success { display: flex; align-items: center; gap: 14px; margin-top: 18px; padding: 15px 18px; background: #eaf8ee; border: 1px solid #ccebd5; border-radius: 13px; color: #278454; }
    .upload-success > svg { width: 22px; height: 22px; }
    .upload-success strong { display: block; font-size: 13px; }
    .upload-success small { display: block; color: #68967a; font-size: 11px; margin-top: 4px; }
    .upload-success button { margin-left: auto; border: 1px solid #a9d9b7; background: white; color: #278454; border-radius: 9px; padding: 9px 12px; font-size: 11px; font-weight: 700; white-space: nowrap; }
    .download-dialog { width: min(420px,calc(100vw - 32px)); border: 1px solid #e3ece5; border-radius: 18px; padding: 0; color: #294133; box-shadow: 0 24px 80px #12342440; }
    .download-dialog:focus { outline: none; }
    .download-dialog::backdrop { background: #10281c70; }
    .dialog-inner { padding: 27px; }
    .dialog-icon { width: 48px; height: 48px; display: grid; place-items: center; background: #e9f7ed; color: #2b9662; border-radius: 13px; margin-bottom: 18px; }
    .dialog-icon svg { width: 24px; height: 24px; }
    .download-dialog h2 { font-size: 19px; margin: 0 0 7px; }
    .download-dialog p { font-size: 12px; color: #8a9a8d; margin: 0; line-height: 1.6; }
    .dialog-file { margin: 20px 0; border: 1px solid #e9efea; background: #f9fbf9; border-radius: 11px; padding: 15px; font-size: 13px; font-weight: 700; overflow-wrap: anywhere; }
    .dialog-file small { display: block; font-size: 11px; font-weight: 400; color: #93a296; margin-top: 5px; }
    .dialog-actions { display: flex; gap: 9px; }
    .dialog-actions button { flex: 1; height: 40px; border-radius: 9px; font-size: 12px; font-weight: 700; }
    .dialog-actions .cancel { background: #fff; border: 1px solid #dfe9e1; color: #718675; }
    .dialog-actions .download { display: flex; align-items: center; justify-content: center; gap: 7px; background: #249766; border: 1px solid #249766; color: #fff; }
    .dialog-actions svg { width: 16px; height: 16px; }
    @media (max-width: 1000px) { .app { grid-template-columns: 210px minmax(0,1fr); } .sidebar { padding-left: 12px; padding-right: 12px; } .topbar { padding: 0 24px; } .content { padding: 30px 24px 45px; } .folders { grid-template-columns: repeat(2,minmax(0,1fr)); } .usage { width: 220px; } }
    @media (max-width: 700px) { .app { display: block; } .sidebar { display: none; } .topbar { height: 67px; padding: 0 18px; } .top-actions { gap: 8px; } .search { width: 38px; padding: 0 9px; justify-content: center; } .search:focus-within { width: 180px; } .search input { width: 0; } .search:focus-within input { width: 130px; } .content { padding: 25px 16px 38px; } .heading h1 { font-size: 23px; } .hero { display: block; padding: 28px 24px; } .hero h2 { font-size: 24px; } .hero p { line-height: 1.7; } .usage { margin-top: 25px; width: 100%; max-width: 250px; } .status-strip { align-items: flex-start; flex-wrap: wrap; } .status-strip .status-time { width: 100%; margin-left: 30px; } .policy { align-items: flex-start; flex-wrap: wrap; } .policy-badge { margin-left: 57px; } .folders { gap: 10px; } .folder { padding: 16px; } .file-head, .file-row { grid-template-columns: minmax(0,1fr) 88px 25px; padding: 0 15px; gap: 7px; } .file-head span:nth-child(2), .file-head span:nth-child(3), .file-head span:nth-child(5), .file-row > span:nth-child(2), .file-row > span:nth-child(3), .file-row > span:nth-child(5) { display: none; } .file-row { height: 62px; } .preview-pill { font-size: 10px; } }
    @media (max-width: 700px) { .status-strip, .policy { display: none; } }
    @media (max-width: 700px) { .upload-success { align-items: flex-start; flex-wrap: wrap; } .upload-success button { margin-left: 36px; } .download-dialog { width: 100%; max-width: none; margin: auto 0 0; border-radius: 20px 20px 0 0; border-bottom: 0; } .dialog-inner { padding: 24px 21px 28px; } }

    [hidden] { display: none !important; }
    .brand-mark { background: #e6f5eb; color: #219b63; box-shadow: none; }
    .brand-mark svg { width: 28px; height: 28px; }
    .sidebar-footer button { border: 0; background: none; color: #74877a; font-size: 12px; padding: 5px; }
    .sidebar-footer button:hover { color: #158a54; }
    .login-screen { min-height: 100vh; display: grid; place-items: center; padding: 20px; background: radial-gradient(circle at 20% 10%,#e7f5ea,#f6f8f6 48%); }
    .login-card { width: min(410px,100%); background: #fff; border: 1px solid #e5eee7; border-radius: 19px; padding: 34px; box-shadow: 0 22px 60px #1b443b12; }
    .login-card .brand-mark { width: 51px; height: 51px; margin-bottom: 23px; }
    .login-card h1 { margin: 0 0 8px; font-size: 23px; }
    .login-card p { margin: 0 0 27px; color: #819286; font-size: 13px; }
    .login-card label { display: block; font-size: 12px; font-weight: 700; margin-bottom: 9px; }
    .login-card input { width: 100%; height: 45px; border: 1px solid #dce8df; border-radius: 9px; padding: 0 12px; outline-color: #38a86b; }
    .login-card .btn { width: 100%; margin-top: 18px; }
    .login-card small { display: block; min-height: 19px; margin-top: 12px; color: #b95436; }
    .mobile-menu, .mobile-backdrop { display: none; }
    .folder { cursor: pointer; text-align: left; font: inherit; }
    .folder:hover { border-color: #b9ddc5; box-shadow: 0 8px 25px #1b8f5a10; }
    .file-actions { display: grid; gap: 8px; margin: 0 0 14px; }
    .file-actions button { border: 1px solid #e1ebe4; background: #f9fbf9; color: #34513c; border-radius: 9px; padding: 11px 13px; text-align: left; font-size: 12px; cursor: pointer; }
    .file-actions button:hover { background: #edf7ef; border-color: #b8ddc3; }
    .file-actions button.primary-action { background: #249766; color: #fff; border-color: #249766; text-align: center; font-weight: 700; }
    .file-actions button.danger-action { color: #ba5737; }
    .dialog-close-button { width: 100%; height: 36px; border: 0; background: transparent; color: #839589; font-size: 12px; cursor: pointer; }
    .upload-progress-dialog { width: min(540px,calc(100vw - 30px)); border: 0; border-radius: 18px; padding: 0; box-shadow: 0 25px 80px #132c1f40; }
    .upload-progress-dialog::backdrop { background: #142b1d80; }
    .upload-progress-card { display: flex; align-items: center; gap: 24px; padding: 29px; }
    .upload-progress-ring { --progress: 0deg; width: 114px; height: 114px; border-radius: 50%; background: conic-gradient(#27a36a var(--progress),#e5f0e8 0); display: grid; place-items: center; flex: none; }
    .upload-progress-ring:before { content: ""; grid-area: 1/1; width: 91px; height: 91px; background: #fff; border-radius: 50%; }
    .upload-progress-ring span { grid-area: 1/1; z-index: 1; color: #248d5e; font-size: 23px; font-weight: 800; }
    .progress-copy { min-width: 0; }
    .progress-copy h3 { margin: 2px 0 8px; font-size: 18px; overflow-wrap: anywhere; }
    .progress-copy > p:not(.eyebrow) { margin: 0 0 15px; color: #849489; font-size: 12px; }
    .progress-copy .eyebrow { margin: 0; }
    .upload-progress-meta { display: grid; gap: 5px; color: #607c6a; font-size: 12px; }
    #progress-cancel { border: 0; background: transparent; color: #8e9c90; font-size: 11px; padding: 13px 0 0; cursor: pointer; }
    .file-row .dots:hover { color: #238d5c; }
    @media (max-width: 700px) {
      .mobile-menu { display: grid; place-items: center; flex: none; width: 34px; height: 34px; border: 0; background: #f2f7f3; color: #238d5c; border-radius: 8px; }
      body.menu-open .sidebar { display: flex; position: fixed; inset: 0 auto 0 0; width: min(280px,84vw); z-index: 20; overflow-y: auto; box-shadow: 12px 0 35px #123c2d22; }
      body.menu-open .mobile-backdrop { display: block; position: fixed; inset: 0; width: 100%; height: 100%; background: #132a1b65; border: 0; z-index: 19; }
      .breadcrumb { overflow: hidden; text-overflow: ellipsis; }
      .topbar { gap: 9px; }
      .upload-progress-card { display: block; padding: 25px; }
      .upload-progress-ring { margin: 0 auto 22px; }
    }