@import "https://fonts.googleapis.com/css2?family=Inter:wght@300;400;500;600;700;800&display=swap";:root{--primary:#2d3ab1;--primary-hover:#232f9c;--primary-light:#eef0ff;--accent:#3b3fce;--accent-hover:#2f33b0;--sidebar-bg:#0f1117;--sidebar-hover:#1a1d2e;--sidebar-active:#1e2240;--sidebar-border:#1e2240;--sidebar-text:#9ca3af;--sidebar-text-active:#fff;--sidebar-icon:#6b7280;--sidebar-icon-active:#fff;--sidebar-width:240px;--bg:#fff;--bg-secondary:#f8f9fa;--bg-tertiary:#f3f4f6;--bg-hover:#f9fafb;--text:#111827;--text-secondary:#6b7280;--text-muted:#9ca3af;--border:#e5e7eb;--border-light:#f3f4f6;--easy:#16a34a;--easy-bg:#f0fdf4;--medium:#d97706;--medium-bg:#fffbeb;--hard:#dc2626;--hard-bg:#fef2f2;--shadow-sm:0 1px 2px #0000000d;--shadow:0 1px 3px #0000001a, 0 1px 2px #0000000f;--shadow-md:0 4px 6px #00000012, 0 2px 4px #0000000f;--shadow-lg:0 10px 15px #0000001a, 0 4px 6px #0000000d;--radius-sm:4px;--radius:6px;--radius-md:8px;--radius-lg:12px;--radius-xl:16px;--radius-full:9999px;--transition:.15s ease}[data-theme=dark]{--bg:#0f1117;--bg-secondary:#161b27;--bg-tertiary:#1e2333;--bg-hover:#1a2030;--text:#f1f5f9;--text-secondary:#94a3b8;--text-muted:#64748b;--border:#1e2d47;--border-light:#172035;--sidebar-bg:#080c14;--sidebar-hover:#101827;--sidebar-active:#141e30;--sidebar-border:#141e30;--primary-light:#1e2d52;--easy-bg:#0d2018;--medium-bg:#201a0a;--hard-bg:#200e0e}*,:before,:after{box-sizing:border-box;margin:0;padding:0}html{-webkit-text-size-adjust:100%;font-size:14px}body{background:var(--bg);color:var(--text);-webkit-font-smoothing:antialiased;font-family:Inter,-apple-system,BlinkMacSystemFont,Segoe 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8px;font-size:12px;font-weight:500;line-height:1.6;display:inline-flex}.badge.easy{color:var(--easy);background:var(--easy-bg)}.badge.medium{color:var(--medium);background:var(--medium-bg)}.badge.hard{color:var(--hard);background:var(--hard-bg)}.btn{border-radius:var(--radius);transition:background var(--transition), border-color var(--transition), color var(--transition);white-space:nowrap;border:1px solid #0000;align-items:center;gap:6px;padding:7px 16px;font-size:13px;font-weight:500;display:inline-flex}.btn-primary{background:var(--primary);color:#fff;border-color:var(--primary)}.btn-primary:hover{background:var(--primary-hover);border-color:var(--primary-hover)}.btn-outline{color:var(--text-secondary);border-color:var(--border);background:0 0}.btn-outline:hover{background:var(--bg-tertiary);color:var(--text)}.btn-solve{color:#fff;border-radius:var(--radius-full);background:#1e2352;padding:5px 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6px;display:flex}.sb-user-avatar{color:#fff;background:linear-gradient(135deg,#6366f1,#a855f7);border-radius:50%;flex-shrink:0;justify-content:center;align-items:center;width:28px;height:28px;font-size:11px;font-weight:700;display:flex}.sb-user-details{flex-direction:column;min-width:0;display:flex}.sb-user-name{color:var(--text);font-size:12px;font-weight:600;line-height:1.2}.sb-user-status{color:var(--text-muted);align-items:center;gap:4px;font-size:10.5px;display:flex}.sb-status-dot{background:#10b981;border-radius:50%;width:6px;height:6px;display:inline-block}.sb-collapsed .sb-item{justify-content:center;padding:10px 0}.sb-collapsed .sb-header{justify-content:center;padding:14px 6px}.sb-collapsed .sb-collapse-toggle{margin:0 auto}.sb-mobile-close-btn{display:none}@media (width<=860px){.sb-container{z-index:100;max-width:85vw;box-shadow:none;transition:transform .25s cubic-bezier(.4,0,.2,1);transform:translate(-100%);width:280px!important}.sb-container.sb-mobile-open{transform:translate(0);box-shadow:0 0 32px #00000059}.sb-collapse-toggle{display:none!important}.sb-mobile-close-btn{border-radius:var(--radius-sm);border:1px solid var(--border);background:var(--bg);width:28px;height:28px;color:var(--text-muted);cursor:pointer;justify-content:center;align-items:center;font-size:13px;transition:all .15s;display:flex}.sb-mobile-close-btn:hover{color:var(--text);border-color:var(--border-hover);background:var(--bg-hover)}.sb-item{padding:11px 14px}}.layout{background:var(--bg);min-height:100vh;display:flex}.layout-main{background:var(--bg);flex:1;min-height:100vh;margin-left:240px;transition:margin-left .2s cubic-bezier(.4,0,.2,1);overflow-x:hidden}.layout-collapsed .layout-main{margin-left:72px}.layout-mobile-bar,.layout-backdrop{display:none}@media (width<=860px){.layout-main{width:100%;min-width:0;padding-top:56px;margin-left:0!important}.layout-mobile-bar{background:var(--bg);border-bottom:1px solid var(--border);z-index:90;justify-content:space-between;align-items:center;height:56px;padding:0 16px;display:flex;position:fixed;top:0;left:0;right:0}.layout-mobile-toggle{border-radius:var(--radius);border:1px solid var(--border);background:var(--bg-secondary);width:36px;height:36px;color:var(--text);cursor:pointer;justify-content:center;align-items:center;transition:all .15s;display:flex}.layout-mobile-toggle:hover{background:var(--bg-hover);border-color:var(--border-hover)}.layout-mobile-brand{align-items:center;gap:8px;text-decoration:none;display:flex}.layout-mobile-logo{background:#6366f11a;border-radius:8px;justify-content:center;align-items:center;width:28px;height:28px;display:flex}.layout-mobile-title{color:var(--text);font-size:16px;font-weight:800}.layout-mobile-highlight{color:var(--primary)}.layout-mobile-theme-btn{border-radius:var(--radius);border:1px solid var(--border);background:var(--bg-secondary);cursor:pointer;justify-content:center;align-items:center;width:36px;height:36px;font-size:14px;transition:all .15s;display:flex}.layout-mobile-theme-btn:hover{background:var(--bg-hover)}.layout-backdrop{-webkit-backdrop-filter:blur(2px);backdrop-filter:blur(2px);z-index:95;background:#00000080;animation:.15s ease-out layoutFadeIn;display:block;position:fixed;inset:0}@keyframes layoutFadeIn{0%{opacity:0}to{opacity:1}}}.dash-container{flex-direction:column;gap:28px;max-width:1240px;margin:0 auto;padding:32px 32px 64px;display:flex}.dash-header{border-bottom:1px solid var(--border);justify-content:space-between;align-items:flex-end;gap:20px;padding-bottom:20px;display:flex}.dash-header-left{flex-direction:column;gap:6px;display:flex}.dash-badge{color:var(--primary);letter-spacing:.04em;text-transform:uppercase;align-items:center;gap:6px;font-size:11.5px;font-weight:600;display:inline-flex}.dash-dot{background:var(--primary);border-radius:50%;width:6px;height:6px}.dash-title{color:var(--text);letter-spacing:-.02em;margin:0;font-size:28px;font-weight:700;line-height:1.2}.dash-subtitle{color:var(--text-muted);margin:0;font-size:13.5px}.dash-header-actions{flex-shrink:0;align-items:center;gap:10px;display:flex}.dash-btn-random{border-radius:var(--radius);border:1px solid var(--border);background:var(--bg);color:var(--text);cursor:pointer;padding:8px 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7px;font-size:11px;font-weight:600}.tag-easy{color:#10b981;background:#10b9811a}.tag-medium{color:#f59e0b;background:#f59e0b1a}.tag-hard{color:#ef4444;background:#ef44441a}.metric-number{color:var(--text);letter-spacing:-.02em;font-size:24px;font-weight:700;line-height:1.1}.metric-sub{color:var(--text-muted);font-size:13px;font-weight:400}.metric-progress-track{background:var(--border);border-radius:9999px;height:4px;margin-top:2px;overflow:hidden}.metric-progress-bar{border-radius:9999px;height:100%;transition:width .4s}.bar-total{background:var(--primary)}.bar-easy{background:#10b981}.bar-medium{background:#f59e0b}.bar-hard{background:#ef4444}.dash-main-split{grid-template-columns:1.25fr 1fr;align-items:stretch;gap:20px;display:grid}.dash-daily-card{background:var(--bg-secondary);border:1px solid var(--border);border-radius:var(--radius);flex-direction:column;justify-content:space-between;gap:18px;padding:24px;display:flex}.daily-card-top{justify-content:space-between;align-items:center;display:flex}.daily-badge-wrap{color:var(--primary);align-items:center;gap:6px;font-size:12px;font-weight:600;display:inline-flex}.daily-sparkle{font-size:14px}.daily-shuffle-btn{color:var(--text-muted);border:1px solid var(--border);border-radius:var(--radius-sm);cursor:pointer;background:0 0;align-items:center;gap:5px;padding:4px 9px;font-size:12px;font-weight:500;transition:all .15s;display:inline-flex}.daily-shuffle-btn:hover{color:var(--text);border-color:var(--border-hover);background:var(--bg)}.daily-body{flex-direction:column;flex:1;gap:16px;display:flex}.daily-header-row{justify-content:space-between;align-items:center;gap:12px;display:flex}.daily-title{color:var(--text);margin:0;font-size:18px;font-weight:600;line-height:1.3}.daily-num{color:var(--text-muted);margin-right:4px;font-weight:500}.daily-tags-wrap{flex-direction:column;gap:10px;display:flex}.daily-tag-group{flex-wrap:wrap;align-items:center;gap:8px;display:flex}.daily-tag-label{color:var(--text-muted);min-width:70px;font-size:11.5px;font-weight:500}.daily-chips{flex-wrap:wrap;align-items:center;gap:5px;display:flex}.daily-chip{border-radius:var(--radius-sm);align-items:center;padding:2px 8px;font-size:11.5px;text-decoration:none;transition:all .12s;display:inline-flex}.company-chip{background:var(--bg);border:1px solid var(--border);color:var(--text-secondary)}.topic-chip{background:var(--primary-light);color:var(--primary);font-weight:500}.topic-chip:hover{filter:brightness(.95)}.daily-chip-more{color:var(--text-muted);font-size:11px;font-weight:600}.daily-actions-row{border-top:1px solid var(--border-light);align-items:center;gap:10px;margin-top:auto;padding-top:14px;display:flex}.daily-solve-btn{padding:8px 18px;font-size:13px;font-weight:500;text-decoration:none}.daily-status-toggle{border:1px solid var(--border);color:var(--text-muted);cursor:pointer;border-radius:var(--radius);background:0 0;padding:8px 14px;font-size:13px;font-weight:500;transition:all .15s}.daily-status-toggle:hover{border-color:var(--border-hover);color:var(--text);background:var(--bg)}.daily-status--solved{color:#10b981;background:#10b9811a;border-color:#10b9814d}.daily-status--solved:hover{color:#059669;background:#10b98126;border-color:#10b981}.daily-loading{text-align:center;color:var(--text-muted);padding:40px 0;font-size:13px}.dash-sheets-card{background:var(--bg-secondary);border:1px solid var(--border);border-radius:var(--radius);flex-direction:column;gap:16px;padding:24px;display:flex}.sheets-card-top{justify-content:space-between;align-items:center;display:flex}.sheets-card-title{color:var(--text);margin:0;font-size:15px;font-weight:600}.sheets-view-all{color:var(--primary);font-size:12.5px;font-weight:500;text-decoration:none}.sheets-view-all:hover{text-decoration:underline}.sheets-list{flex-direction:column;gap:8px;display:flex}.sheet-row-item{border-radius:var(--radius);background:var(--bg);border:1px solid #0000;align-items:center;gap:12px;padding:10px 12px;text-decoration:none;transition:all .15s;display:flex}.sheet-row-item:hover{border-color:var(--border);background:var(--bg-hover);transform:translate(2px)}.sheet-row-icon{flex-shrink:0;justify-content:center;align-items:center;width:28px;height:28px;font-size:18px;display:flex}.sheet-row-main{flex-direction:column;flex:1;gap:4px;min-width:0;display:flex}.sheet-row-title-wrap{align-items:center;gap:8px;display:flex}.sheet-row-title{color:var(--text);font-size:13.5px;font-weight:600}.sheet-row-tag{color:var(--text-muted);background:var(--bg-secondary);border:1px solid var(--border-light);text-transform:uppercase;letter-spacing:.03em;border-radius:9999px;padding:1px 6px;font-size:10px;font-weight:600}.sheet-row-progress-wrap{align-items:center;gap:8px;display:flex}.sheet-row-track{background:var(--border-light);border-radius:9999px;flex:1;height:4px;overflow:hidden}.sheet-row-fill{background:var(--primary);border-radius:9999px;height:100%;transition:width 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strong{color:var(--text)}.sd-progress-bars{flex-direction:column;gap:8px;display:flex}.sd-pbar-row{align-items:center;gap:8px;font-size:11.5px;display:flex}.sd-pbar-lbl{width:50px;font-weight:600}.sd-pbar-easy{color:#10b981}.sd-pbar-med{color:#f59e0b}.sd-pbar-hard{color:#ef4444}.sd-pbar-track{background:var(--border-light);border-radius:999px;flex:1;height:5px;overflow:hidden}.sd-pbar-fill{border-radius:999px;height:100%;transition:width .4s}.sd-pbar-fill-easy{background:#10b981}.sd-pbar-fill-med{background:#f59e0b}.sd-pbar-fill-hard{background:#ef4444}.sd-pbar-val{color:var(--text-muted);text-align:right;width:38px;font-size:11px}.sd-content{padding:24px 32px}.sd-filter-row{flex-wrap:wrap;justify-content:space-between;align-items:center;gap:16px;margin-bottom:18px;display:flex}.sd-diff-tabs{align-items:center;gap:6px;display:flex}.sd-diff-tab{border:1px solid var(--border);background:var(--bg-card);color:var(--text-secondary);cursor:pointer;border-radius:8px;padding:6px 13px;font-size:12.5px;font-weight:500;transition:all .12s}.sd-diff-tab:hover{background:var(--bg-hover);color:var(--text)}.sd-diff-tab--active{background:var(--primary);border-color:var(--primary);color:#fff}.sd-diff-tab--active:hover{background:var(--primary);color:#fff}.sd-search-controls{align-items:center;gap:10px;display:flex}.sd-search-wrap{width:240px;position:relative}.sd-search-icon{color:var(--text-muted);pointer-events:none;position:absolute;top:50%;left:10px;transform:translateY(-50%)}.sd-search-input{background:var(--bg-card);border:1px solid var(--border);border-radius:var(--radius);width:100%;color:var(--text);outline:none;padding:7px 12px 7px 32px;font-size:13px;transition:border-color .15s,box-shadow .15s}.sd-search-input:focus{border-color:var(--primary);box-shadow:0 0 0 3px #6366f126}.sd-btn-practice-inline{background:var(--primary);color:#fff;border-radius:var(--radius);cursor:pointer;white-space:nowrap;border:none;align-items:center;gap:6px;padding:7px 14px;font-size:12.5px;font-weight:600;transition:opacity .15s;display:inline-flex}.sd-btn-practice-inline:hover{opacity:.92}.sd-table-card{background:var(--bg-card);border:1px solid var(--border);border-radius:var(--radius-xl);box-shadow:var(--shadow-sm);overflow:hidden}@media (width<=900px){.sd-hero-container{flex-direction:column}.sd-progress-card{width:100%}}@media (width<=640px){.sd-page{gap:16px;padding:16px 14px 48px}.sd-hero-card{padding:16px}.sd-hero-title{font-size:20px}.sd-filter-bar{flex-direction:column;align-items:stretch;gap:10px}.sd-diff-pills{-webkit-overflow-scrolling:touch;flex-wrap:nowrap;width:100%;overflow-x:auto}.sd-diff-pill{white-space:nowrap;flex-shrink:0}.sd-search-box{width:100%;min-width:100%}.sd-node-item{padding:8px 12px}}