:root{--bg: #f6f7fb;--card: #ffffff;--text: #1f2430;--muted: #6b7280;--primary: #4f46e5;--primary-dark: #4338ca;--green: #16a34a;--green-bg: #ecfdf5;--red: #dc2626;--red-bg: #fef2f2;--border: #e5e7eb;--radius: 14px}*{box-sizing:border-box}body{margin:0;font-family:system-ui,-apple-system,Segoe UI,Roboto,sans-serif;background:var(--bg);color:var(--text);-webkit-font-smoothing:antialiased}#app{max-width:640px;margin:0 auto;padding:16px}.topbar{display:flex;align-items:center;justify-content:space-between;gap:8px;padding:8px 0 16px}.topbar h1{font-size:1.15rem;margin:0}.chip{display:inline-block;font-size:.75rem;font-weight:600;padding:4px 10px;border-radius:999px;background:#eef2ff;color:var(--primary-dark);white-space:nowrap}.chip-topic{background:#f0fdf4;color:#166534}.chip-marks{background:#fff7ed;color:#9a3412}.progress{margin-bottom:16px}.progress-label{font-size:.8rem;color:var(--muted);margin-bottom:6px}.progress-track{height:6px;background:var(--border);border-radius:999px;overflow:hidden}.progress-fill{height:100%;background:var(--primary);border-radius:999px;transition:width .3s ease}.card{background:var(--card);border:1px solid var(--border);border-radius:var(--radius);padding:20px;box-shadow:0 1px 3px #0000000d}.meta{display:flex;gap:8px;flex-wrap:wrap;margin-bottom:12px}.question-text{font-size:1.05rem;line-height:1.6;overflow-x:auto}.question-text p{margin:0 0 8px}.options{display:flex;flex-direction:column;gap:10px;margin-top:16px}.option{display:flex;align-items:center;gap:12px;width:100%;text-align:left;padding:12px 14px;border:1.5px solid var(--border);border-radius:10px;background:var(--card);font-size:1rem;cursor:pointer;transition:border-color .15s,background .15s}.option:hover:not(:disabled){border-color:var(--primary)}.option.selected{border-color:var(--primary);background:#eef2ff}.option.correct{border-color:var(--green);background:var(--green-bg)}.option.incorrect{border-color:var(--red);background:var(--red-bg)}.option:disabled{cursor:default;opacity:1;color:inherit}.option-letter{flex:none;width:28px;height:28px;display:grid;place-items:center;border-radius:50%;background:var(--bg);font-weight:700;font-size:.85rem}.numeric-input{width:100%;margin-top:16px;padding:12px 14px;font-size:1.1rem;border:1.5px solid var(--border);border-radius:10px;outline:none}.numeric-input:focus{border-color:var(--primary)}.numeric-input.correct{border-color:var(--green);background:var(--green-bg)}.numeric-input.incorrect{border-color:var(--red);background:var(--red-bg)}.hint{margin-top:12px;color:var(--muted);font-size:.9rem}.actions{display:flex;gap:10px;margin-top:18px;flex-wrap:wrap}.btn{flex:1;min-width:140px;padding:13px 18px;font-size:1rem;font-weight:600;border:none;border-radius:10px;cursor:pointer;transition:filter .15s}.btn:disabled{opacity:.5;cursor:not-allowed}.btn:hover:not(:disabled){filter:brightness(.95)}.btn-primary{background:var(--primary);color:#fff}.btn-success{background:var(--green);color:#fff}.btn-danger{background:var(--red);color:#fff}.verdict{margin-top:16px;padding:10px 14px;border-radius:10px;font-weight:700}.verdict-correct{background:var(--green-bg);color:var(--green)}.verdict-incorrect{background:var(--red-bg);color:var(--red)}.solution{margin-top:14px;padding:14px;border-radius:10px;background:var(--bg);border:1px solid var(--border);line-height:1.65;overflow-x:auto}.solution-title{font-weight:700;font-size:.8rem;text-transform:uppercase;letter-spacing:.05em;color:var(--muted);margin-bottom:6px}.solution p{margin:0 0 10px}.solution p:last-child{margin-bottom:0}.score-card{text-align:center}.score-big{font-size:3rem;font-weight:800;color:var(--primary)}.score-pct{font-size:1.2rem;color:var(--muted);margin-top:4px}.score-message{margin:12px 0 20px}.score-breakdown{list-style:none;padding:0;margin:0 0 20px;text-align:left}.score-breakdown li{display:flex;justify-content:space-between;gap:12px;padding:10px 12px;border-bottom:1px solid var(--border);font-size:.95rem}.row-correct{color:var(--green)}.row-incorrect{color:var(--red)}@media (min-width: 480px){#app{padding:24px}.card{padding:28px}}.home-link{color:inherit;text-decoration:none}.tagline{color:var(--muted);font-size:.92rem;margin:0 0 16px}.test-list{display:flex;flex-direction:column;gap:12px}.test-card{display:flex;align-items:center;justify-content:space-between;gap:12px;width:100%;text-align:left;background:var(--card);border:1.5px solid var(--border);border-radius:var(--radius);padding:16px;cursor:pointer;font:inherit;transition:border-color .15s}.test-card:hover{border-color:var(--primary)}.test-card-title{font-weight:700;margin-bottom:4px}.test-card-sub{font-size:.85rem;color:var(--muted)}.status-chip{flex:none;font-size:.75rem;font-weight:700;padding:4px 10px;border-radius:999px;white-space:nowrap}.status-new{background:var(--bg);color:var(--muted)}.status-progress{background:#fff7ed;color:#9a3412}.status-done{background:var(--green-bg);color:var(--green)}.status-wrong{background:var(--red-bg);color:var(--red)}.landing-title{margin:10px 0 4px;font-size:1.3rem}.landing-teacher{color:var(--muted);margin:0 0 8px;font-size:.9rem}.landing-facts{list-style:none;padding:0;margin:14px 0 4px}.landing-facts li{padding:7px 0;border-bottom:1px solid var(--border);font-size:.92rem}.landing-facts li:last-child{border-bottom:none}.btn-ghost{background:var(--bg);color:var(--text);border:1.5px solid var(--border)}.review-header{display:flex;align-items:center;justify-content:space-between;gap:12px;margin-bottom:12px}.review-header .landing-title{margin:0;font-size:1.1rem}.score-big-small{font-size:1.4rem}.review-item{margin-bottom:12px}.review-given{margin:10px 0 0;font-size:.92rem;color:var(--muted)}.google-btn-slot{margin:18px 0 6px;min-height:44px}.login-error{color:var(--red);font-size:.9rem;margin:8px 0 0}.profile-row{display:flex;align-items:center;gap:12px;background:var(--card);border:1px solid var(--border);border-radius:var(--radius);padding:10px 14px;margin-bottom:14px}.profile-pic{width:36px;height:36px;border-radius:50%;flex:none}.profile-main{min-width:0;flex:1}.profile-name{font-weight:700;font-size:.95rem;white-space:nowrap;overflow:hidden;text-overflow:ellipsis}.profile-sub{font-size:.78rem;color:var(--muted);white-space:nowrap;overflow:hidden;text-overflow:ellipsis}.btn-link{background:none;border:none;color:var(--primary);font-size:.85rem;font-weight:600;cursor:pointer;padding:6px}.server-results{margin-top:14px}.welcome{text-align:center;padding:32px 24px}.welcome-emoji{font-size:2.6rem;margin-bottom:8px}.welcome-title{font-size:1.35rem;margin:0 0 8px}.welcome-sub{color:var(--muted);font-size:.95rem;line-height:1.55;margin:0 0 8px}.welcome .google-btn-slot{display:flex;justify-content:center}.welcome-divider{display:flex;align-items:center;gap:12px;color:var(--muted);font-size:.8rem;margin:14px 0}.welcome-divider:before,.welcome-divider:after{content:"";flex:1;height:1px;background:var(--border)}.welcome .btn-ghost{width:100%}.welcome-note{margin-top:12px}.teacher-entry{margin-bottom:14px;border-color:var(--primary)}.roster-card{margin-top:14px}.roster-row{display:flex;align-items:center;justify-content:space-between;gap:12px;padding:10px 0;border-bottom:1px solid var(--border)}.roster-row:last-child{border-bottom:none}.roster-name{font-weight:700;font-size:.95rem}.roster-sub{font-size:.8rem;color:var(--muted)}.cred-card{margin-top:14px;padding:14px;border-radius:10px;background:var(--green-bg);border:1.5px solid var(--green)}.cred-title{font-weight:700;margin-bottom:6px}.cred-line{font-size:.95rem;margin-bottom:4px}.cred-copy{margin-top:10px;width:100%}.admin-link-row{margin:16px 0 0}.admin-link-row .btn-link{color:var(--muted);font-weight:500}