:root{--color-bg:#f8fafc;--color-surface:#fff;--color-border:#e2e8f0;--color-text:#0f172a;--color-text-muted:#64748b;--color-primary:#4f46e5;--color-primary-hover:#4338ca;--color-primary-bg:#eef2ff;--color-danger:#dc2626;--color-danger-bg:#fef2f2;--sidebar-bg:#0b1120;--sidebar-bg-active:#171f38;--sidebar-text:#94a3b8;--sidebar-text-active:#fff;--shadow-sm:0 1px 2px #0f172a0d;--shadow-md:0 4px 16px #0f172a14;--shadow-lg:0 16px 40px #0f172a1f;color:var(--color-text);background:var(--color-bg);font-synthesis:none;text-rendering:optimizelegibility;-webkit-font-smoothing:antialiased;font-family:Inter,system-ui,Segoe UI,Roboto,sans-serif}*{box-sizing:border-box}body{min-height:100svh;margin:0}#root{min-height:100svh}h1,h2,h3{letter-spacing:-.015em;margin:0 0 8px;font-weight:600}button{cursor:pointer;font-family:inherit}input,select{font-family:inherit}.page-loading{min-height:100svh;color:var(--color-text-muted);justify-content:center;align-items:center;display:flex}.login-page{background:linear-gradient(180deg, var(--color-primary-bg) 0%, var(--color-bg) 420px);justify-content:center;align-items:center;min-height:100svh;padding:24px;display:flex}.login-card{background:var(--color-surface);border:1px solid var(--color-border);width:100%;max-width:380px;box-shadow:var(--shadow-lg);border-radius:14px;padding:36px 32px}.login-brand{color:var(--color-text);letter-spacing:-.01em;margin-bottom:4px;font-size:22px;font-weight:700}.login-subtitle{color:var(--color-text-muted);margin-bottom:24px;font-size:14px}.field{text-align:left;margin-bottom:16px}.field label{color:var(--color-text);margin-bottom:6px;font-size:13px;font-weight:600;display:block}.field input:not([type=checkbox]):not([type=radio]),.field select,.field textarea{border:1px solid var(--color-border);background:var(--color-surface);width:100%;color:var(--color-text);border-radius:8px;padding:10px 12px;font-size:14px}.field input:not([type=checkbox]):not([type=radio]):focus,.field select:focus,.field textarea:focus{border-color:var(--color-primary);outline:none;box-shadow:0 0 0 3px #4f46e51f}.field input[type=checkbox],.field input[type=radio]{width:16px;height:16px;accent-color:var(--color-primary);flex:none}.btn-primary{background:var(--color-primary);color:#fff;width:100%;box-shadow:var(--shadow-sm);border:none;border-radius:8px;padding:11px 16px;font-size:14px;font-weight:600;transition:background .15s,box-shadow .15s,transform .1s}.btn-primary:hover:not(:disabled){background:var(--color-primary-hover);box-shadow:var(--shadow-md)}.btn-primary:active:not(:disabled){transform:translateY(1px)}.btn-primary:disabled{opacity:.6;cursor:not-allowed}.btn-secondary{border:1px solid var(--color-border);background:var(--color-surface);color:var(--color-text);border-radius:8px;padding:9px 14px;font-size:14px;font-weight:500;transition:background .15s,border-color .15s}.btn-secondary:hover:not(:disabled){background:var(--color-bg);border-color:#cbd5e1}.btn-secondary:disabled{opacity:.5;cursor:not-allowed}.error-banner{background:var(--color-danger-bg);color:var(--color-danger);border-radius:8px;margin-bottom:16px;padding:10px 12px;font-size:13px}.hint-box{background:var(--color-bg);color:var(--color-text-muted);border-radius:8px;margin-top:20px;padding:12px;font-size:12px;line-height:1.5}.admin-layout{min-height:100svh;display:flex}.admin-sidebar{background:var(--sidebar-bg);width:220px;color:var(--sidebar-text);flex-direction:column;flex-shrink:0;padding:24px 16px;display:flex}.admin-sidebar .brand{color:#fff;margin-bottom:32px;padding:0 8px;font-size:18px;font-weight:700}.admin-sidebar .brand .org-name{color:var(--sidebar-text);margin-top:4px;font-size:12px;font-weight:500}.admin-sidebar nav{flex-direction:column;flex:1;gap:4px;display:flex}.admin-sidebar a{color:var(--sidebar-text);border-left:3px solid #0000;border-radius:0 8px 8px 0;padding:10px 12px;font-size:14px;font-weight:500;text-decoration:none;transition:background .15s,color .15s}.admin-sidebar a:hover{color:var(--sidebar-text-active);background:#ffffff0f}.admin-sidebar a.active{background:var(--sidebar-bg-active);border-left-color:var(--color-primary);color:var(--sidebar-text-active)}.admin-sidebar .user-box{border-top:1px solid #ffffff1a;padding-top:16px;font-size:13px}.admin-sidebar .user-box .name{color:#fff;margin-bottom:2px;font-weight:600}.admin-sidebar .user-box .role{text-transform:capitalize;color:var(--sidebar-text);margin-bottom:10px}.admin-main{flex:1;padding:32px 40px;overflow-x:auto}.admin-topbar{justify-content:flex-end;margin:-16px 0 16px;display:flex}.admin-topbar .org-logo{object-fit:contain;max-width:180px;max-height:40px}.org-logo-thumb{object-fit:contain;border:1px solid var(--color-border);background:var(--color-surface);border-radius:6px;width:40px;height:40px}.org-logo-thumb-empty{background:var(--color-border)}.page-header{flex-wrap:wrap;justify-content:space-between;align-items:center;gap:16px;margin-bottom:24px;display:flex}.page-header p{color:var(--color-text-muted);margin:4px 0 0;font-size:14px}.card{background:var(--color-surface);border:1px solid var(--color-border);box-shadow:var(--shadow-sm);border-radius:12px;padding:24px}table{border-collapse:collapse;width:100%;font-size:14px}th,td{text-align:left;border-bottom:1px solid var(--color-border);padding:12px}th{color:var(--color-text-muted);text-transform:uppercase;letter-spacing:.5px;font-size:11px;font-weight:600}tbody tr{transition:background .1s}tbody tr:hover{background:var(--color-bg)}tbody tr:last-child td{border-bottom:none}.badge{text-transform:capitalize;background:var(--color-bg);color:var(--color-text-muted);border:1px solid var(--color-border);border-radius:999px;padding:2px 10px;font-size:12px;font-weight:600;display:inline-block}.badge-pending{color:#6b7280;background:#f3f4f6;border-color:#e5e7eb}.badge-invited{color:#1c5aa6;background:#e9f1fc;border-color:#cfe1f7}.badge-in_progress{color:#b4650a;background:#fdf2e2;border-color:#f7e0bb}.badge-completed,.badge-pass{color:#1a6d3d;background:#e8f7ee;border-color:#cdecda}.badge-fail{color:var(--color-danger);background:var(--color-danger-bg);border-color:#f6cfc7}.badge-needs-grading{color:#b4650a;background:#fdf2e2;border-color:#f7e0bb}.badge-muted{color:#6b7280;background:#f3f4f6;border-color:#e5e7eb}.grade-option-row{border:1px solid var(--color-border);border-radius:8px;align-items:center;gap:10px;margin-bottom:6px;padding:8px 12px;font-size:14px;display:flex}.grade-option-row.correct-selected{background:#e8f7ee;border-color:#cdecda}.grade-option-row.correct-unselected{background:#f6ecfb;border-color:#ecd6f7}.grade-option-row.wrong-selected{background:var(--color-danger-bg);border-color:#f6cfc7}.grade-answer-block{border-bottom:1px solid var(--color-border);padding:20px 0}.grade-answer-block:last-child{border-bottom:none}.grade-marks-input{align-items:center;gap:8px;margin-top:12px;display:flex}.grade-marks-input input{border:1px solid var(--color-border);border-radius:6px;width:70px;padding:6px 10px;font-size:14px}.tab-bar{border-bottom:1px solid var(--color-border);gap:4px;margin-bottom:20px;display:flex}.tab-bar button{color:var(--color-text-muted);background:0 0;border:none;border-bottom:2px solid #0000;margin-bottom:-1px;padding:10px 16px;font-size:14px;font-weight:500}.tab-bar button.active{color:var(--color-primary);border-bottom-color:var(--color-primary)}.upload-dropzone{border:1px dashed var(--color-border);border-radius:8px;flex-wrap:wrap;align-items:center;gap:12px;padding:16px;display:flex}.modal-backdrop{z-index:50;background:#0f121e73;justify-content:center;align-items:center;padding:16px;display:flex;position:fixed;inset:0}.modal{background:var(--color-surface);width:100%;max-width:420px;box-shadow:var(--shadow-lg);border-radius:14px;padding:28px}.modal-actions{justify-content:flex-end;gap:8px;margin-top:20px;display:flex}.empty-state{color:var(--color-text-muted);text-align:center;padding:24px 0;font-size:14px}.candidate-page{text-align:center;justify-content:center;align-items:center;min-height:100svh;padding:24px;display:flex}.candidate-card{max-width:480px}.candidate-card p{color:var(--color-text-muted);margin-top:8px}.otp-input{letter-spacing:8px;text-align:center;font-size:24px}.exam-shell{flex-direction:column;min-height:100svh;display:flex}.exam-topbar{background:var(--color-surface);border-bottom:1px solid var(--color-border);justify-content:space-between;align-items:center;padding:12px 24px;display:flex}.exam-timer{font-variant-numeric:tabular-nums;background:var(--color-bg);border-radius:8px;padding:6px 14px;font-size:18px;font-weight:700}.exam-timer.low-time{background:var(--color-danger-bg);color:var(--color-danger)}.exam-body{flex:1;min-height:0;display:flex}.exam-nav{background:var(--color-surface);border-right:1px solid var(--color-border);flex-shrink:0;width:260px;padding:16px;overflow-y:auto}.exam-nav h4{text-transform:uppercase;color:var(--color-text-muted);margin:16px 0 8px;font-size:12px}.exam-nav h4:first-child{margin-top:0}.exam-nav-grid{grid-template-columns:repeat(5,1fr);gap:6px;display:grid}.exam-nav-btn{aspect-ratio:1;border:1px solid var(--color-border);background:var(--color-surface);width:100%;color:var(--color-text);border-radius:6px;font-size:13px;font-weight:600}.exam-nav-btn.answered{color:#1a6d3d;background:#e8f7ee;border-color:#cdecda}.exam-nav-btn.current{border-color:var(--color-primary);box-shadow:0 0 0 2px #4f46e540}.exam-main{flex:1;padding:32px;overflow-y:auto}.exam-question-card{max-width:720px}.exam-question-meta{color:var(--color-text-muted);justify-content:space-between;align-items:center;margin-bottom:12px;font-size:13px;display:flex}.exam-option-row{border:1px solid var(--color-border);cursor:pointer;border-radius:8px;align-items:center;gap:10px;margin-bottom:8px;padding:10px 12px;display:flex}.exam-option-row:hover{border-color:var(--color-primary)}.exam-option-row input{width:16px;height:16px;accent-color:var(--color-primary);flex:none}.exam-textarea{border:1px solid var(--color-border);resize:vertical;border-radius:8px;width:100%;padding:12px;font-family:inherit;font-size:14px}.exam-textarea.code{min-height:220px;font-family:ui-monospace,Consolas,monospace;font-size:13px}.exam-footer-nav{justify-content:space-between;max-width:720px;margin-top:24px;display:flex}.save-indicator{color:var(--color-text-muted);margin-top:6px;font-size:12px}.stat-grid{grid-template-columns:repeat(auto-fit,minmax(140px,1fr));gap:12px;margin-bottom:20px;display:grid}.stat-card{background:var(--color-surface);border:1px solid var(--color-border);box-shadow:var(--shadow-sm);border-radius:12px;padding:16px}.stat-card-clickable{cursor:pointer;transition:border-color .15s,box-shadow .15s}.stat-card-clickable:hover,.stat-card-clickable:focus-visible{border-color:var(--color-primary);outline:none;box-shadow:0 4px 12px #4f46e51f}.stat-value{color:var(--color-text);font-size:26px;font-weight:700}.stat-label{color:var(--color-text-muted);margin-top:4px;font-size:12px}.bar-chart{align-items:flex-end;gap:16px;height:140px;padding-top:12px;display:flex}.bar-chart-col{flex-direction:column;flex:1;justify-content:flex-end;align-items:center;height:100%;display:flex}.bar-chart-count{margin-bottom:4px;font-size:12px;font-weight:600}.bar-chart-bar{border-radius:4px 4px 0 0;width:100%;min-height:2px}.bucket-pass{background:#2f9e5c}.bucket-fail{background:var(--color-danger)}.legend-swatch{vertical-align:middle;border-radius:2px;width:10px;height:10px;margin-right:4px;display:inline-block}.bar-chart-label{color:var(--color-text-muted);margin-top:6px;font-size:11px}.dashboard-charts{grid-template-columns:repeat(auto-fit,minmax(280px,1fr));gap:16px;margin-bottom:20px;display:grid}.chart-card-title{margin-bottom:14px;font-size:13px;font-weight:600}.bucket-pending{background:#e8a33d}.stacked-bar{background:var(--color-border);border-radius:999px;width:100%;height:14px;display:flex;overflow:hidden}.stacked-bar-segment{height:100%;transition:width .3s}.progress-legend{color:var(--color-text-muted);flex-wrap:wrap;gap:14px;margin-top:12px;font-size:12px;display:flex}.mini-bar-row{grid-template-columns:90px 1fr 28px;align-items:center;gap:10px;margin-bottom:10px;font-size:12px;display:grid}.mini-bar-row:last-child{margin-bottom:0}.mini-bar-track{background:var(--color-border);border-radius:999px;height:10px;overflow:hidden}.mini-bar-fill{background:var(--color-primary);border-radius:999px;height:100%;transition:width .3s}.mini-bar-count{text-align:right;color:var(--color-text-muted)}.pass-rate-cell{align-items:center;gap:10px;min-width:140px;display:flex}.pass-rate-cell .mini-bar-track{flex:1}.trend-chart{align-items:flex-end;gap:8px;height:100px;display:flex}.trend-chart-col{flex-direction:column;flex:1;justify-content:flex-end;align-items:center;height:100%;display:flex}.trend-chart-bar{background:var(--color-primary);border-radius:4px 4px 0 0;width:100%;min-height:2px}.trend-chart-label{color:var(--color-text-muted);margin-top:6px;font-size:10px}