@import "https://fonts.googleapis.com/css2?family=Nunito:wght@400;500;600;700;800&display=swap";:root{--color-primary:#2563eb;--color-primary-lt:#eff6ff;--color-success:#16a34a;--color-success-lt:#f0fdf4;--color-danger:#dc2626;--color-danger-lt:#fef2f2;--color-neutral:#6b7280;--color-neutral-lt:#f3f4f6;--color-surface:#fff;--color-bg:#f8fafc;--color-text:#111827;--color-text-muted:#6b7280;--radius-card:16px;--shadow-card:0 2px 8px #00000014}*{box-sizing:border-box;margin:0;padding:0}body{background:var(--color-bg);color:var(--color-text);font-family:Nunito,sans-serif}#root{min-height:100vh}button{cursor:pointer;border:none;font-family:inherit}.page-content{max-width:480px;margin:0 auto;padding:16px}.page-list{flex-direction:column;gap:12px;display:flex}.page-header{z-index:100;background:var(--color-surface);padding:12px 16px;position:sticky;top:0;box-shadow:0 1px 4px #00000014}.app-header{align-items:center;gap:12px;display:flex}.app-header__back,.app-header__spacer,.app-header__right{flex:none}.app-header__spacer{width:58px}.app-header__back{color:var(--color-primary);cursor:pointer;white-space:nowrap;background:0 0;border:none;justify-content:center;align-items:center;gap:4px;width:28px;padding:0;font-size:15px;display:flex}.app-header__title{text-align:center;white-space:nowrap;text-overflow:ellipsis;flex:1;min-width:0;margin:0;font-size:20px;font-weight:800;line-height:1.1;overflow:hidden}.app-header__title--center{text-align:center}.app-header__right{margin-left:auto}.main-btn{background:var(--color-surface);border-radius:var(--radius-card);width:100%;box-shadow:var(--shadow-card);cursor:pointer;text-align:left;border:none;align-items:center;gap:14px;margin-bottom:12px;padding:18px 20px;transition:transform .15s;display:flex}.main-btn:active{transform:scale(.97)}.main-btn__icon{background:var(--color-primary-lt);border-radius:12px;justify-content:center;align-items:center;width:48px;height:48px;font-size:24px;display:flex}.main-btn__text{flex:1}.main-btn__title{font-size:17px;font-weight:700}.main-btn__subtitle{color:var(--color-text-muted);margin-top:2px;font-size:13px}.lang-switcher{background:var(--color-neutral-lt);border-radius:16px;gap:1px;padding:1px;display:flex}.lang-switcher__btn{letter-spacing:.2px;width:28px;height:24px;color:var(--color-text-muted);cursor:pointer;background:0 0;border-radius:12px;padding:0;font-size:10px;font-weight:700;line-height:1}.lang-switcher__btn--flag{text-align:center}.lang-switcher__btn--active{color:var(--color-primary);background:#2563eb1f}.topic-item{background:var(--color-surface);border-radius:var(--radius-card);box-shadow:var(--shadow-card);padding:16px}.topic-item__title{font-size:17px;font-weight:700}.topic-item__progress{background:var(--color-neutral-lt);border-radius:99px;height:6px;margin-top:8px}.topic-item__progress-fill{background:var(--color-primary);border-radius:99px;height:100%}.topic-item__count{color:var(--color-text-muted);margin-top:4px;font-size:12px}.progress-dots{background:var(--color-neutral-lt);justify-content:flex-start;gap:6px;padding:12px 16px;display:flex;overflow-x:auto}.progress-dot{border-radius:50%;flex-shrink:0;justify-content:center;align-items:center;width:32px;height:32px;font-size:13px;font-weight:700;display:flex}.progress-dot--correct{background:var(--color-success);color:#fff}.progress-dot--wrong{background:var(--color-danger);color:#fff}.progress-dot--current{background:var(--color-primary);color:#fff;box-shadow:0 0 0 3px var(--color-primary-lt);transform:scale(1.15)}.progress-dot--unanswered{background:var(--color-neutral-lt);color:var(--color-neutral)}.question-image{background:#fff;border-radius:12px;width:auto;max-width:100%;height:auto;max-height:220px;margin:0 auto 16px;display:block}.question-text{margin-bottom:16px;font-size:18px;font-weight:700;line-height:1.4}.answer-btn{background:var(--color-surface);border:2px solid var(--color-neutral-lt);text-align:left;cursor:pointer;border-radius:12px;width:100%;min-height:52px;margin-bottom:10px;padding:14px 16px;font-size:16px;font-weight:500;transition:all .1s}.answer-btn:active{border-color:var(--color-primary);background:var(--color-primary-lt);transform:scale(.97)}.answer-letter{color:var(--color-primary);margin-right:8px;font-weight:700}.order-display{background:var(--color-neutral-lt);min-height:52px;color:var(--color-primary);border-radius:12px;justify-content:center;align-items:center;margin-bottom:12px;padding:14px 16px;font-size:20px;font-weight:700;display:flex}.order-grid{grid-template-columns:repeat(5,1fr);gap:8px;margin-bottom:12px;display:grid}.order-num-btn{background:var(--color-surface);border:2px solid var(--color-neutral-lt);cursor:pointer;border-radius:12px;width:56px;height:56px;font-size:20px;font-weight:700}.order-num-btn--selected{background:var(--color-primary);color:#fff;border-color:var(--color-primary)}.done-btn{background:var(--color-primary);color:#fff;cursor:pointer;border:none;border-radius:12px;width:100%;height:52px;margin-top:12px;font-size:16px;font-weight:700}.done-btn:active{transform:scale(.97)}.info-tile{background:var(--color-surface);box-shadow:var(--shadow-card);border-radius:12px;align-items:center;gap:12px;margin-bottom:10px;padding:14px 16px;display:flex}.info-tile__icon{background:var(--color-primary-lt);border-radius:10px;justify-content:center;align-items:center;width:40px;height:40px;font-size:20px;display:flex}.info-tile__text{font-size:16px;font-weight:600}.result-banner{text-align:center;border-radius:16px;width:100%;margin-bottom:20px;padding:20px;font-size:28px;font-weight:800}.result-banner--passed{background:var(--color-success);color:#fff}.result-banner--failed{background:var(--color-danger);color:#fff}.stats-grid{grid-template-columns:1fr 1fr;gap:10px;margin-bottom:20px;display:grid}.stat-card{background:var(--color-surface);box-shadow:var(--shadow-card);text-align:center;border-radius:12px;padding:16px}.stat-card__value{font-size:28px;font-weight:800}.stat-card__label{color:var(--color-text-muted);margin-top:4px;font-size:13px}.wrong-btn{background:var(--color-danger);color:#fff;cursor:pointer;border:none;border-radius:50%;width:52px;height:52px;font-size:13px;font-weight:700}.modal-overlay{z-index:1000;background:#00000080;justify-content:center;align-items:flex-start;padding:72px 16px 16px;display:flex;position:fixed;inset:0}.modal{background:var(--color-surface);border-radius:var(--radius-card);width:100%;max-width:32rem;max-height:90vh;position:relative;overflow-y:auto}.modal-header{z-index:2;background:var(--color-surface);border-bottom:1px solid var(--color-neutral-lt);justify-content:space-between;align-items:center;gap:12px;padding:16px;display:flex;position:sticky;top:0}.modal-title{font-size:18px;font-weight:800}.modal-content{padding:16px}.review-answer{border:1px solid var(--color-neutral-lt);background:var(--color-surface);border-radius:8px;margin-bottom:8px;padding:12px}.review-answer--correct{background:var(--color-success-lt);border-color:var(--color-success)}.review-answer--wrong{background:var(--color-danger-lt);border-color:var(--color-danger)}