:root{--color-bg:#f4f6f9;--color-surface:#fff;--color-border:#dfe3ea;--color-text:#1e2a3a;--color-text-muted:#5b6472;--color-primary:#0f2a4a;--color-primary-light:#16407a;--color-accent:#0e7c86;--color-high:#15803d;--color-medium:#b45309;--color-low:#5b6472;--color-easy:#15803d;--color-mediumq:#c2790b;--color-hard:#c0392b;--font-body:"Inter", -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;--space-1:4px;--space-2:8px;--space-3:12px;--space-4:16px;--space-5:24px;--space-6:32px;--space-7:48px;--radius:10px;--shadow:0 1px 3px #00000014, 0 1px 2px #0000000d;--shadow-hover:0 6px 16px #0000001a}*{box-sizing:border-box}body{font-family:var(--font-body);background-color:var(--color-bg);color:var(--color-text);-webkit-font-smoothing:antialiased;margin:0;line-height:1.5}h1,h2,h3,h4{letter-spacing:-.01em;color:var(--color-text);margin:0;font-weight:700}h1{font-size:28px}h2{font-size:22px}h3{font-size:16px}p{margin:0}a{color:var(--color-accent)}.navbar{background-color:var(--color-primary);color:#fff;justify-content:space-between;align-items:center;padding:16px 32px;display:flex}.navbar,.navbar *{color:#fff}.navbar a{text-decoration:none}.navbar h1,.navbar .brand{color:#fff;font-size:20px}.navbar-right{align-items:center;gap:16px;font-size:14px;display:flex}.logout-btn{color:#fff;cursor:pointer;background-color:#c0392b;border:none;border-radius:6px;padding:8px 16px;font-size:14px;font-weight:600}.logout-btn:hover{background-color:#a93226}.page-container{max-width:1100px;margin:0 auto;padding:32px 24px}.search-bar,input[type=text],input[type=search]{border:1px solid var(--color-border);border-radius:var(--radius);background-color:var(--color-surface);width:100%;color:var(--color-text);outline:none;padding:12px 16px;font-size:15px;transition:border-color .15s}.search-bar:focus,input:focus{border-color:var(--color-accent)}.filter-group{flex-wrap:wrap;gap:10px;margin:16px 0 28px;display:flex}.filter-pill{border:1px solid var(--color-border);background-color:var(--color-surface);color:var(--color-text-muted);cursor:pointer;border-radius:999px;padding:8px 18px;font-size:14px;font-weight:500;transition:all .15s}.filter-pill:hover{border-color:var(--color-primary)}.filter-pill.active{background-color:var(--color-primary);color:#fff;border-color:var(--color-primary)}.company-grid{grid-template-columns:repeat(auto-fill,minmax(300px,1fr));gap:20px;display:grid}.company-card{background-color:var(--color-surface);border:1px solid var(--color-border);border-radius:var(--radius);box-shadow:var(--shadow);cursor:pointer;padding:20px;transition:box-shadow .15s,transform .15s}.company-card:hover{box-shadow:var(--shadow-hover);transform:translateY(-2px)}.company-card-header{justify-content:space-between;align-items:flex-start;gap:10px;margin-bottom:10px;display:flex}.company-card-desc{color:var(--color-text-muted);margin-bottom:14px;font-size:14px}.tier-badge{color:#fff;letter-spacing:.02em;white-space:nowrap;border-radius:6px;padding:4px 10px;font-size:11px;font-weight:700;display:inline-block}.difficulty-badge{color:#fff;text-align:center;border-radius:6px;flex-shrink:0;min-width:64px;padding:4px 10px;font-size:11px;font-weight:700}.tag-group{flex-wrap:wrap;gap:8px;display:flex}.tag{color:var(--color-text);background-color:#eef1f6;border-radius:6px;padding:6px 12px;font-size:13px;font-weight:500;display:inline-block}.tag-clickable{cursor:pointer;transition:background-color .15s}.tag-clickable:hover{background-color:var(--color-accent);color:#fff}.tag-alt{color:#8a5a00;background-color:#fff3e0}.hint-text{color:var(--color-text-muted);font-size:12px;font-weight:400}.detail-page{max-width:800px;margin:0 auto;padding:32px 24px}.back-btn{color:var(--color-accent);cursor:pointer;background:0 0;border:none;margin-bottom:16px;padding:0;font-size:14px;font-weight:600}.detail-card{background-color:var(--color-surface);border:1px solid var(--color-border);border-radius:var(--radius);box-shadow:var(--shadow);padding:32px}.detail-header{flex-wrap:wrap;justify-content:space-between;align-items:center;gap:16px;margin-bottom:12px;display:flex}.detail-desc{color:var(--color-text-muted);margin-bottom:28px;font-size:15px}.detail-section{border-top:1px solid var(--color-border);margin-bottom:28px;padding-top:24px}.detail-section:first-of-type{border-top:none;padding-top:0}.detail-section h3{margin-bottom:14px}.questions-list{flex-direction:column;gap:8px;display:flex}.question-row{border:1px solid var(--color-border);color:inherit;background-color:#fafbfc;border-radius:8px;align-items:center;gap:14px;padding:12px 14px;text-decoration:none;transition:background-color .15s,border-color .15s;display:flex}.question-row:hover{border-color:var(--color-accent);background-color:#f0f4fa}.question-title{flex:1;min-width:160px;font-size:14px;font-weight:600}.question-topics{color:var(--color-text-muted);text-overflow:ellipsis;white-space:nowrap;flex-shrink:0;max-width:260px;font-size:12px;overflow:hidden}.auth-page{background:linear-gradient(160deg,#0f2a4a 0%,#16407a 45%,#0e7c86 100%);justify-content:center;align-items:center;min-height:100vh;padding:20px;display:flex}.auth-card{background-color:var(--color-surface);border-radius:16px;width:100%;max-width:400px;padding:40px 36px;position:relative;overflow:hidden;box-shadow:0 20px 50px #00000040}.auth-brand{justify-content:center;align-items:center;gap:10px;margin-bottom:8px;display:flex}.auth-brand-icon{background:linear-gradient(135deg, var(--color-primary), var(--color-accent));color:#fff;border-radius:10px;flex-shrink:0;justify-content:center;align-items:center;width:40px;height:40px;font-size:18px;font-weight:700;display:flex}.auth-brand-name{color:var(--color-text);letter-spacing:-.01em;font-size:19px;font-weight:700}.auth-card h2{text-align:center;margin-bottom:4px;font-size:22px}.auth-subtitle{text-align:center;color:var(--color-text-muted);margin-bottom:28px;font-size:14px}.error-text{color:#c0392b;background-color:#fdecea;border:1px solid #f5c6c2;border-radius:8px;align-items:center;gap:8px;margin-bottom:18px;padding:10px 14px;font-size:13px;display:flex}.form-group{margin-bottom:18px}.form-group label{color:var(--color-text-muted);margin-bottom:6px;font-size:13px;font-weight:600;display:block}.form-group input{border:1.5px solid var(--color-border);width:100%;color:var(--color-text);background-color:#fafbfc;border-radius:8px;outline:none;padding:12px 14px;font-size:15px;transition:border-color .15s,box-shadow .15s,background-color .15s}.form-group input:focus{border-color:var(--color-accent);background-color:var(--color-surface);box-shadow:0 0 0 3px #0e7c8626}.btn-primary{background:linear-gradient(135deg, var(--color-primary), var(--color-primary-light));color:#fff;cursor:pointer;border:none;border-radius:8px;width:100%;margin-top:4px;padding:13px;font-size:15px;font-weight:600;transition:transform .15s,box-shadow .15s;box-shadow:0 4px 12px #0f2a4a40}.btn-primary:hover{transform:translateY(-1px);box-shadow:0 6px 16px #0f2a4a59}.btn-primary:active{transform:translateY(0)}.auth-switch{text-align:center;color:var(--color-text-muted);margin-top:20px;font-size:13px}.auth-switch a{color:var(--color-accent);font-weight:600;text-decoration:none}.auth-switch a:hover{text-decoration:underline}.status-text{text-align:center;color:var(--color-text-muted);padding:40px 0;font-size:14px}@media (width<=640px){.navbar{padding:12px 16px}.page-container,.detail-page{padding:20px 16px}.detail-card{padding:20px}.company-grid{grid-template-columns:1fr}.question-row{flex-wrap:wrap}.question-topics{white-space:normal;max-width:100%}}