:root{--bg-app: #0f0f12;--bg-surface: #17171c;--bg-surface-elevated: #202027;--bg-surface-hover: #2a2a34;--bg-input: #121216;--border: rgba(255, 255, 255, .08);--border-hover: rgba(255, 255, 255, .16);--border-focus: rgba(255, 161, 22, .5);--text-primary: #f8fafc;--text-secondary: #94a3b8;--text-muted: #64748b;--accent: #ffa116;--accent-hover: #ff9100;--accent-glow: rgba(255, 161, 22, .16);--accent-bg: rgba(255, 161, 22, .1);--easy: #00b8a3;--easy-bg: rgba(0, 184, 163, .15);--easy-border: rgba(0, 184, 163, .3);--medium: #ffc01e;--medium-bg: rgba(255, 192, 30, .15);--medium-border: rgba(255, 192, 30, .3);--hard: #ff375f;--hard-bg: rgba(255, 55, 95, .15);--hard-border: rgba(255, 55, 95, .3);--font-sans: "Plus Jakarta Sans", -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, sans-serif;--font-mono: "JetBrains Mono", monospace;--shadow-sm: 0 1px 2px 0 rgba(0, 0, 0, .2);--shadow-md: 0 4px 14px 0 rgba(0, 0, 0, .3);--shadow-lg: 0 10px 30px -4px rgba(0, 0, 0, .5);--shadow-glow: 0 0 20px rgba(255, 161, 22, .2)}[data-theme=light]{--bg-app: #f8fafc;--bg-surface: #ffffff;--bg-surface-elevated: #f1f5f9;--bg-surface-hover: #e2e8f0;--bg-input: #ffffff;--border: rgba(0, 0, 0, .08);--border-hover: rgba(0, 0, 0, .16);--border-focus: rgba(255, 161, 22, .6);--text-primary: #0f172a;--text-secondary: #475569;--text-muted: #94a3b8;--shadow-sm: 0 1px 2px 0 rgba(0, 0, 0, .05);--shadow-md: 0 4px 14px 0 rgba(0, 0, 0, .08);--shadow-lg: 0 10px 30px -4px rgba(0, 0, 0, .1)}*{box-sizing:border-box;margin:0;padding:0}body{background-color:var(--bg-app);color:var(--text-primary);font-family:var(--font-sans);font-size:14px;line-height:1.5;min-height:100vh;-webkit-font-smoothing:antialiased;-moz-osx-font-smoothing:grayscale}.app-container{min-height:100vh;display:flex;flex-direction:column}.navbar{position:sticky;top:0;z-index:50;background:var(--bg-surface);border-bottom:1px solid var(--border);backdrop-filter:blur(12px);-webkit-backdrop-filter:blur(12px);padding:0 24px}.navbar-inner{max-width:1440px;margin:0 auto;height:64px;display:flex;align-items:center;justify-content:space-between;gap:16px}.brand-group{display:flex;align-items:center;gap:12px;text-decoration:none;color:var(--text-primary)}.brand-icon{font-size:24px;padding:6px;background:var(--accent-glow);border:1px solid rgba(255,161,22,.3);border-radius:10px;line-height:1}.brand-title{font-size:16px;font-weight:800;letter-spacing:-.3px;display:flex;align-items:center;gap:8px}.brand-badge{font-size:11px;font-weight:700;padding:2px 7px;border-radius:6px;background:var(--accent-bg);color:var(--accent);border:1px solid rgba(255,161,22,.3)}.nav-actions{display:flex;align-items:center;gap:10px}.nav-btn{display:inline-flex;align-items:center;gap:6px;padding:7px 12px;border-radius:8px;background:var(--bg-surface-elevated);border:1px solid var(--border);color:var(--text-secondary);font-size:12px;font-weight:600;cursor:pointer;text-decoration:none;transition:all .15s ease}.nav-btn:hover{background:var(--bg-surface-hover);color:var(--text-primary);border-color:var(--border-hover)}.nav-btn.primary{background:var(--accent);color:#000;border-color:var(--accent);font-weight:700}.nav-btn.primary:hover{background:var(--accent-hover)}.main-content{max-width:1440px;width:100%;margin:0 auto;padding:24px;flex:1}.hero-section{display:flex;flex-direction:column;gap:12px;margin-bottom:24px}.hero-title{font-size:28px;font-weight:800;letter-spacing:-.5px;color:var(--text-primary)}.hero-title span{color:var(--accent)}.hero-subtitle{font-size:14px;color:var(--text-secondary);max-width:780px}.tab-navigation{display:flex;gap:8px;border-bottom:1px solid var(--border);padding-bottom:12px;margin-bottom:24px;overflow-x:auto}.tab-nav-btn{display:inline-flex;align-items:center;gap:8px;padding:8px 16px;border-radius:8px;background:transparent;border:1px solid transparent;color:var(--text-secondary);font-size:13px;font-weight:600;cursor:pointer;transition:all .15s ease;white-space:nowrap}.tab-nav-btn:hover{color:var(--text-primary);background:var(--bg-surface-elevated)}.tab-nav-btn.active{background:var(--bg-surface);color:var(--accent);border-color:var(--border);box-shadow:var(--shadow-sm)}.filter-panel{background:var(--bg-surface);border:1px solid var(--border);border-radius:14px;padding:20px;box-shadow:var(--shadow-md);margin-bottom:24px;display:flex;flex-direction:column;gap:16px}.filter-row-top{display:grid;grid-template-columns:1fr auto;gap:16px;align-items:center}@media (max-width: 868px){.filter-row-top{grid-template-columns:1fr}}.company-select-wrap{position:relative;flex:1}.input-with-icon{position:relative;width:100%}.input-icon{position:absolute;left:14px;top:50%;transform:translateY(-50%);color:var(--text-muted);font-size:14px;pointer-events:none}.custom-input{width:100%;padding:10px 14px 10px 40px;background:var(--bg-input);border:1px solid var(--border);border-radius:10px;color:var(--text-primary);font-family:var(--font-sans);font-size:13px;outline:none;transition:all .2s ease}.custom-input:focus{border-color:var(--accent);box-shadow:0 0 0 3px var(--accent-glow)}.company-dropdown-menu{position:absolute;top:calc(100% + 6px);left:0;right:0;background:var(--bg-surface-elevated);border:1px solid var(--border);border-radius:10px;box-shadow:var(--shadow-lg);max-height:280px;overflow-y:auto;z-index:100}.dropdown-item{display:flex;align-items:center;justify-content:space-between;padding:10px 14px;cursor:pointer;transition:background .15s ease;font-size:13px;color:var(--text-primary)}.dropdown-item:hover,.dropdown-item.active{background:var(--bg-surface-hover);color:var(--accent)}.dropdown-meta{font-size:11px;color:var(--text-muted)}.popular-chips-wrap{display:flex;flex-wrap:wrap;align-items:center;gap:6px}.chips-label{font-size:12px;font-weight:700;color:var(--text-muted);text-transform:uppercase;letter-spacing:.5px;margin-right:4px}.popular-chip{display:inline-flex;align-items:center;gap:5px;padding:5px 11px;border-radius:8px;background:var(--bg-surface-elevated);border:1px solid var(--border);color:var(--text-secondary);font-size:12px;font-weight:600;cursor:pointer;transition:all .15s ease}.popular-chip:hover{background:var(--bg-surface-hover);color:var(--text-primary);border-color:var(--border-hover)}.popular-chip.active{background:var(--accent);color:#000;border-color:var(--accent);font-weight:700;box-shadow:var(--shadow-glow)}.sub-filters-row{display:flex;flex-wrap:wrap;align-items:center;justify-content:space-between;gap:12px;padding-top:14px;border-top:1px solid var(--border)}.filter-group{display:flex;align-items:center;gap:6px;flex-wrap:wrap}.filter-group-label{font-size:12px;font-weight:600;color:var(--text-muted);margin-right:2px}.btn-segment-group{display:flex;background:var(--bg-input);border:1px solid var(--border);border-radius:8px;padding:3px;gap:2px}.btn-segment{background:transparent;border:none;padding:5px 10px;border-radius:6px;font-size:12px;font-weight:600;color:var(--text-secondary);cursor:pointer;transition:all .15s ease}.btn-segment:hover{color:var(--text-primary)}.btn-segment.active{background:var(--bg-surface);color:var(--accent);box-shadow:var(--shadow-sm)}.btn-segment.easy.active{color:var(--easy)}.btn-segment.medium.active{color:var(--medium)}.btn-segment.hard.active{color:var(--hard)}.company-stats-card{background:var(--bg-surface);border:1px solid var(--border);border-radius:14px;padding:18px 22px;margin-bottom:20px;display:flex;align-items:center;justify-content:space-between;flex-wrap:wrap;gap:16px;box-shadow:var(--shadow-sm)}.stats-company-info{display:flex;align-items:center;gap:14px}.stats-company-logo{font-size:32px;line-height:1}.stats-company-title{font-size:20px;font-weight:800;color:var(--text-primary)}.stats-company-subtitle{font-size:12px;color:var(--text-secondary);display:flex;gap:8px;align-items:center}.difficulty-breakdown-bar{display:flex;flex-direction:column;gap:6px;min-width:260px}.diff-bar-track{height:6px;border-radius:3px;display:flex;overflow:hidden;background:var(--bg-input);gap:1px}.diff-bar-fill-easy{background:var(--easy)}.diff-bar-fill-med{background:var(--medium)}.diff-bar-fill-hard{background:var(--hard)}.diff-bar-labels{display:flex;justify-content:space-between;font-size:11px;font-weight:700}.table-card{background:var(--bg-surface);border:1px solid var(--border);border-radius:14px;overflow:hidden;box-shadow:var(--shadow-md)}.table-wrapper{overflow-x:auto;width:100%}.problems-table{width:100%;border-collapse:collapse;text-align:left;font-size:13px}.problems-table th{background:var(--bg-surface-elevated);padding:12px 16px;font-size:11px;font-weight:700;text-transform:uppercase;letter-spacing:.6px;color:var(--text-muted);border-bottom:1px solid var(--border);cursor:pointer;-webkit-user-select:none;user-select:none}.problems-table th:hover{color:var(--text-primary)}.problems-table td{padding:12px 16px;border-bottom:1px solid var(--border);color:var(--text-primary);vertical-align:middle}.problems-table tr:hover td{background:var(--bg-surface-hover)}.prob-title-link{color:var(--text-primary);text-decoration:none;font-weight:600;display:inline-flex;align-items:center;gap:6px;transition:color .15s ease}.prob-title-link:hover{color:var(--accent)}.diff-badge{display:inline-block;font-size:11px;font-weight:700;padding:3px 8px;border-radius:6px}.diff-badge.easy{background:var(--easy-bg);color:var(--easy);border:1px solid var(--easy-border)}.diff-badge.medium{background:var(--medium-bg);color:var(--medium);border:1px solid var(--medium-border)}.diff-badge.hard{background:var(--hard-bg);color:var(--hard);border:1px solid var(--hard-border)}.freq-pill{display:inline-flex;align-items:center;gap:4px;font-size:11px;font-weight:700;padding:2px 7px;border-radius:6px}.freq-pill.high{background:#ef444426;color:#f87171;border:1px solid rgba(239,68,68,.3)}.freq-pill.med{background:#ffa11626;color:#ffa116;border:1px solid rgba(255,161,22,.3)}.freq-pill.low{background:#94a3b81f;color:var(--text-secondary)}.timeframe-pill{font-size:10px;padding:1px 5px;border-radius:4px;background:var(--bg-input);border:1px solid var(--border);color:var(--text-muted)}.solved-checkbox{-webkit-appearance:none;-moz-appearance:none;appearance:none;width:16px;height:16px;border:1px solid var(--border);border-radius:4px;background:var(--bg-input);cursor:pointer;display:inline-flex;align-items:center;justify-content:center;transition:all .15s ease}.solved-checkbox:checked{background:var(--easy);border-color:var(--easy)}.solved-checkbox:checked:after{content:"✓";color:#fff;font-size:11px;font-weight:800}.empty-table-state{text-align:center;padding:48px 24px;color:var(--text-muted)}.footer{margin-top:auto;border-top:1px solid var(--border);padding:24px;background:var(--bg-surface);text-align:center;font-size:12px;color:var(--text-muted)}.footer a{color:var(--accent);text-decoration:none}