.ob-wrap{max-width:620px;margin:0 auto;padding:0}.ob-screen{display:none}.ob-screen.active{display:block;animation:ob-appear .3s ease}@keyframes ob-appear{0%{opacity:0;transform:translateY(8px)}to{opacity:1;transform:translateY(0)}}.ob-welcome-card{text-align:center;padding:3rem 2rem;background:var(--color-surface);border:1px solid var(--color-border);border-radius:8px}.ob-kicker{font-size:.7rem;font-weight:600;letter-spacing:.12em;text-transform:uppercase;color:var(--color-warm);margin-bottom:.75rem}.ob-welcome-card h1{font-family:var(--font-display);font-size:1.8rem;font-weight:600;line-height:1.2;letter-spacing:-.02em;margin-bottom:.5rem}.ob-welcome-card .subtitle{font-size:.95rem;color:var(--color-text-secondary);margin-bottom:2rem;line-height:1.65;max-width:460px;margin-left:auto;margin-right:auto}.ob-welcome-card .conf{font-size:.82rem;color:var(--color-text-tertiary);line-height:1.7;border-top:1px solid var(--color-border);padding-top:1.5rem;margin-top:1.75rem;text-align:left}.ob-welcome-card .conf p{margin:0 0 .5rem}.ob-start-btn{display:inline-block;padding:.85rem 3rem;background:var(--color-warm);color:#fff;border:none;border-radius:8px;font-family:var(--font-body);font-size:.95rem;font-weight:600;cursor:pointer;transition:opacity .15s}.ob-start-btn:hover{opacity:.9}.ob-start-btn:disabled{opacity:.4;cursor:not-allowed}.ob-progress-bar{position:sticky;top:var(--header-height, 0);z-index:90;background:#faf9f7eb;backdrop-filter:blur(12px);-webkit-backdrop-filter:blur(12px);border-bottom:1px solid var(--color-border);padding:.75rem 1.5rem;margin:-3rem -1.5rem 0}@media(max-width:640px){.ob-progress-bar{margin:-1.5rem -1rem 0;padding:.75rem 1rem}}.ob-progress-inner{max-width:620px;margin:0 auto}.ob-progress-steps{display:flex;align-items:center;justify-content:center;gap:.5rem;margin-bottom:.5rem}.ob-progress-dot{width:8px;height:8px;border-radius:50%;background:var(--color-border);transition:all .3s}.ob-progress-dot.done{background:var(--color-warm)}.ob-progress-dot.current{background:var(--color-warm);width:24px;border-radius:4px}.ob-progress-label{text-align:center;font-size:.75rem;font-weight:500;color:var(--color-text-tertiary);letter-spacing:.05em}.ob-progress-track{height:2px;background:var(--color-border);border-radius:1px;margin-top:.4rem;overflow:hidden}.ob-progress-fill{height:100%;background:var(--color-warm);border-radius:1px;transition:width .4s cubic-bezier(.22,1,.36,1);width:0}.ob-question-area{min-height:50vh;display:flex;align-items:center;justify-content:center;padding:2rem 0}.ob-question-card{width:100%;text-align:center}.ob-question-number{font-size:.7rem;font-weight:600;color:var(--color-text-tertiary);text-transform:uppercase;letter-spacing:.15em;margin-bottom:1rem}.ob-question-stem{font-size:.85rem;color:var(--color-text-tertiary);letter-spacing:.02em;margin-bottom:.5rem;font-style:italic}.ob-question-text{font-family:var(--font-display);font-size:1.4rem;font-weight:500;line-height:1.4;color:var(--color-text);margin-bottom:2.5rem;min-height:3rem;transition:opacity .15s;max-width:520px;margin-left:auto;margin-right:auto;letter-spacing:-.01em}.ob-question-text.fading{opacity:0}.ob-answer-row{display:flex;flex-direction:column;gap:.6rem;align-items:center;width:100%;max-width:460px;margin:0 auto}.ob-answer-btn{width:100%;padding:.9rem 1.5rem;border:2px solid var(--color-border);border-radius:12px;background:var(--color-surface);color:var(--color-text);font-family:var(--font-body);font-size:1rem;font-weight:500;line-height:1.45;cursor:pointer;transition:all .15s;text-align:center}.ob-answer-btn:hover{border-color:var(--color-warm);color:var(--color-warm);background:var(--color-warm-light, #eef2f0);transform:translateY(-1px);box-shadow:0 2px 8px #4a7c6f1f}.ob-answer-btn.flash{border-color:var(--color-warm);color:#fff;background:var(--color-warm);transform:translateY(0)}.ob-nav-row{display:flex;justify-content:center;margin-top:1.5rem;gap:.75rem}.ob-back-btn{padding:.5rem 1rem;border:none;background:none;font-family:var(--font-body);font-size:.85rem;font-weight:500;color:var(--color-text-tertiary);cursor:pointer;transition:color .15s}.ob-back-btn:hover{color:var(--color-text)}.ob-kbd-hint{margin-top:1rem;font-size:.72rem;color:var(--color-text-tertiary);letter-spacing:.05em}.ob-kbd-hint kbd{font-family:var(--font-body);font-size:.7rem;padding:.1rem .35rem;border:1px solid var(--color-border);border-radius:4px;background:var(--color-surface);color:var(--color-text-secondary)}@media(max-width:640px){.ob-kbd-hint{display:none}}.ob-status-card{text-align:center;padding:3rem 2rem;background:var(--color-surface);border:1px solid var(--color-border);border-radius:8px}.ob-status-card h1{font-family:var(--font-display);font-size:1.8rem;font-weight:600;line-height:1.2;letter-spacing:-.02em;margin-bottom:1rem}.ob-status-card p{font-size:.95rem;color:var(--color-text-secondary);line-height:1.65;max-width:460px;margin:0 auto .5rem}.ob-score{font-family:var(--font-display);font-size:1.4rem;color:var(--color-warm);margin:1.5rem 0!important;font-weight:600}.ob-spinner{width:28px;height:28px;border:2.5px solid var(--color-border);border-top-color:var(--color-warm);border-radius:50%;margin:0 auto 1.25rem;animation:ob-spin .72s linear infinite}@keyframes ob-spin{to{transform:rotate(360deg)}}.ob-error-detail{font-size:.82rem;color:var(--color-text-tertiary);margin-top:1rem;font-family:var(--font-mono)}