:root{--bg: #ffffff;--sidebar: #fbfbfa;--sidebar-hover: #efeeeb;--surface: #ffffff;--surface-soft: #f7f7f5;--ink: #37352f;--muted: #6f6e69;--faint: #9b9a97;--line: #eeeeec;--line-strong: #d9d6ce;--accent: #0f6b58;--accent-soft: #e7f3ef;--danger: #c23b32;--shadow: 0 20px 48px rgba(15, 15, 15, .08);--small-shadow: 0 4px 14px rgba(15, 15, 15, .06);color-scheme:light}*{box-sizing:border-box}body{margin:0;min-height:100vh;background:var(--bg);color:var(--ink);font-family:ui-sans-serif,-apple-system,BlinkMacSystemFont,Segoe UI,Inter,sans-serif}button,input{font:inherit}button,a{-webkit-tap-highlight-color:transparent}button{cursor:pointer}a{color:inherit;text-decoration:none}.boot-fallback,.fatal-error{max-width:680px;margin:72px auto;border:1px solid var(--line);border-radius:10px;background:var(--surface);padding:24px;box-shadow:var(--small-shadow)}.fatal-error{color:var(--danger)}.app-shell{display:grid;grid-template-columns:268px minmax(0,1fr);min-height:100vh;background:var(--bg)}.sidebar{position:sticky;top:0;display:flex;flex-direction:column;height:100vh;border-right:1px solid #ededeb;background:var(--sidebar);padding:10px 8px}.sidebar-brand-row,.sidebar-close,.mobile-scrim,.mobile-search-spacer{display:none}.sidebar-top{min-height:0;overflow:auto;scrollbar-width:thin;padding-bottom:12px}.brand,.brand.large,.nav-item,.subject-tab,.tree-item,.profile-card,.topbar,.topbar-left,.breadcrumb,.search-box,.workspace-actions,.block-heading,.folder-card,.table-row,.row-actions,.input-shell{display:flex;align-items:center}.brand{gap:10px;padding:14px 8px 18px}.brand.large{gap:12px;padding:0}.brand-mark{display:grid;place-items:center;flex:0 0 auto;overflow:hidden;width:38px;height:38px;border-radius:10px;background:#242529;color:#fff;box-shadow:0 12px 24px #0f0f0f29}.brand-mark.with-image{background:#edece8}.brand-mark img{width:100%;height:100%;object-fit:cover}.brand.large 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span{flex:1;min-width:0;overflow:hidden;text-overflow:ellipsis;white-space:nowrap}.subject-tab small{display:grid;place-items:center;min-width:22px;height:22px;border-radius:999px;background:#ffffffb8;color:var(--muted);font-size:12px;font-weight:800}.page-tree{margin:16px 0}.tree-item{color:var(--muted);padding-left:18px}.tree-item.child{padding-left:30px}.tree-empty{display:block;padding:6px 18px;color:var(--faint);font-size:13px}.back-link{display:inline-flex;align-items:center;color:var(--muted)}.back-link svg{transform:rotate(180deg)}.sidebar-bottom{display:grid;gap:8px;margin-top:auto;border-top:1px solid var(--line);padding:10px 6px 2px}.profile-card{gap:9px;width:100%;border:0;border-radius:8px;background:transparent;color:var(--ink);padding:8px;text-align:left}.profile-card:hover,.profile-card.active{background:var(--sidebar-hover)}.profile-card strong,.profile-card span{display:block}.profile-card strong{font-size:13px}.profile-card span{margin-top:1px;color:var(--muted);font-size:12px}.account-avatar{display:grid;place-items:center;flex:0 0 auto;overflow:hidden;border-radius:999px;background:#edece8;color:var(--muted)}.account-avatar.small{width:28px;height:28px}.account-avatar.large{width:64px;height:64px}.account-avatar img{width:100%;height:100%;object-fit:cover}.settings-scrim{position:fixed;inset:0;z-index:80;border:0;background:#0f0f0f2e}.profile-drawer{position:fixed;inset:0 0 0 auto;z-index:90;width:min(460px,calc(100vw - 18px));border-left:1px solid var(--line);background:var(--surface);padding:22px;overflow:auto;box-shadow:-24px 0 60px #0f0f0f1f}.profile-panel{display:grid;gap:18px}.profile-panel-head,.profile-title,.profile-actions-row{display:flex;align-items:center}.profile-panel-head{justify-content:space-between;gap:14px;border-bottom:1px solid var(--line);padding-bottom:18px}.profile-title{gap:14px;min-width:0}.profile-title strong,.profile-title span{display:block;min-width:0}.profile-title 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label{display:grid;gap:8px;color:var(--ink);font-size:13px;font-weight:750}.input-shell{gap:9px;min-height:42px;border:1px solid var(--line);border-radius:8px;background:var(--surface);color:var(--muted);padding:0 11px}.input-shell:focus-within{border-color:var(--line-strong);box-shadow:0 0 0 3px #0f0f0f0a}.input-shell input{width:100%;min-width:0;border:0;outline:0;background:transparent;color:var(--ink)}.input-shell button{display:grid;place-items:center;width:28px;height:28px;border:0;border-radius:6px;background:transparent;color:var(--muted)}.input-shell button:hover{background:var(--surface-soft)}.form-error{margin:-4px 0 0;color:var(--danger);font-size:13px;font-weight:700}@media(max-width:1080px){.app-shell{grid-template-columns:238px minmax(0,1fr)}.subject-workspace{width:min(860px,calc(100% - 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9px;font-size:14px}.sidebar-bottom{margin-top:10px;padding-bottom:0}.workspace{min-height:100dvh}.topbar{align-items:stretch;flex-direction:column;gap:8px;min-height:0;padding:max(8px,env(safe-area-inset-top)) 12px 10px}.topbar-left{width:100%}.icon-button{width:36px;height:36px}.breadcrumb{flex:1;min-width:0;overflow:hidden;font-size:12px}.breadcrumb span,.breadcrumb button{min-width:0;overflow:hidden;text-overflow:ellipsis;white-space:nowrap}.breadcrumb button{flex:0 0 auto}.search-box{flex:1;width:100%;min-height:38px;border-color:var(--line);background:var(--surface-soft)}.dashboard-page{align-content:start;gap:24px;min-height:auto;padding:22px 14px 58px}.dashboard-grid,.folder-grid,.explorer-grid,.exam-summary{grid-template-columns:1fr}.dashboard-grid{gap:10px}.dashboard-tile{grid-template-columns:auto 1fr;align-items:center;column-gap:12px;row-gap:2px;min-height:78px;padding:12px}.dashboard-tile svg{grid-row:span 2}.dashboard-tile strong{font-size:28px}.dashboard-tile 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h1{font-size:34px}.table-row{grid-template-columns:1fr;gap:6px;align-items:start}.exam-row{grid-template-columns:1fr;gap:5px;border:1px solid var(--line);border-radius:8px;margin-bottom:8px;padding:10px}.exam-head,.table-head{display:none}.accordion-summary{align-items:center;min-height:50px;padding:8px 6px}.accordion-meta{display:none}.accordion-title{white-space:normal;line-height:1.3}.accordion-panel{padding:0 6px 14px 40px}.folder-row-inner{align-items:stretch;flex-direction:column}.folder-row-actions{flex-wrap:wrap;padding:0 0 8px 40px}.accordion-actions{gap:8px}.action-chip{min-height:36px;padding:7px 9px}.primary-btn,.ghost-btn{width:100%;min-height:40px}.login-page{align-content:start;gap:26px;min-height:100dvh;padding:max(24px,env(safe-area-inset-top)) 18px max(24px,env(safe-area-inset-bottom))}.login-copy .brand{margin-bottom:26px}.login-copy p{font-size:15px}.login-card{padding:18px}}@media(max-width:420px){.sidebar{width:min(90vw,318px)}.subject-workspace{padding-inline:12px}.page-title-row h1,.login-copy h1{font-size:30px}.folder-row-actions,.accordion-panel{padding-left:6px}.action-chip{flex:1 1 100%;justify-content:center}.profile-actions-row{grid-template-columns:1fr}}@media(max-width:360px){.workspace-actions{grid-template-columns:1fr}}