:root{--ink:#173545;--accent:#176c68;--paper:#f4f7f7}body{background:var(--paper);color:var(--ink);font-family:system-ui,-apple-system,"Segoe UI",sans-serif;line-height:1.6}.app-container{max-width:1080px}.site-header{background:#fff;border-bottom:1px solid #e0e7e7}.site-header nav{padding-block:1rem;display:flex;align-items:center;justify-content:space-between;gap:1rem;flex-wrap:wrap}.brand{text-decoration:none;color:var(--ink);font-size:1.3rem;font-weight:750}.brand span{color:var(--accent)}.nav-links{display:flex;gap:1.1rem;align-items:center;flex-wrap:wrap}.nav-links a{color:#45616e;text-decoration:none}.nav-links a:hover,.back-link:hover{text-decoration:underline}h1{font-size:clamp(1.75rem,4vw,2.5rem);font-weight:700;letter-spacing:-.03em}.eyebrow{font-size:.75rem;letter-spacing:.14em;color:var(--accent);font-weight:700}.card{border:1px solid #dce6e6;border-radius:16px;box-shadow:0 3px 12px #17354504}.btn{min-height:44px;padding:.55rem 1.1rem;border-radius:10px}.btn-sm{min-height:40px}.btn-primary{--bs-btn-bg:#176c68;--bs-btn-border-color:#176c68;--bs-btn-hover-bg:#125753;--bs-btn-hover-border-color:#125753;--bs-btn-active-bg:#125753;--bs-btn-active-border-color:#125753;--bs-btn-disabled-bg:#176c68;--bs-btn-disabled-border-color:#176c68}.form-control{min-height:46px}.form-check-input{width:1.3em;height:1.3em;flex-shrink:0}.form-check-input:checked{background-color:var(--accent);border-color:var(--accent)}.login-card{max-width:540px;margin:3vh auto}.subject-card{color:var(--ink);text-decoration:none;min-height:235px;border-top:4px solid var(--accent)}.subject-card:hover,.history-card:hover{border-color:var(--accent)}.subject-geography{border-top-color:#3c6eac}.subject-literature{border-top-color:#bc7a35}.subject-number{font-size:2rem;font-weight:650;color:#708d98}.unit-card{cursor:pointer}.unit-title{font-size:1.08rem;font-weight:650}.status-completed{color:#176c68;font-weight:700}.status-in_progress{color:#8c6209;font-weight:650}.selection-bar{position:sticky;bottom:1rem;box-shadow:0 3px 20px #17354514}.back-link{color:var(--accent);text-decoration:none}.question-text{white-space:pre-wrap;line-height:1.7}.answer-option{padding:1rem;display:flex;align-items:flex-start;gap:1rem;border:1px solid #d8e3e3;border-radius:12px;cursor:pointer;margin-bottom:.75rem}.answer-option:has(input:checked){border-color:var(--accent);background:#edf7f6}.answer-option input{margin-top:.3em}.option-letter{color:#506e7b}.quiz-card{max-width:850px;margin-inline:auto}progress{display:block;width:100%;height:10px;accent-color:var(--accent)}.question-grid{display:grid;grid-template-columns:repeat(auto-fill,minmax(44px,1fr));gap:.5rem}.history-card{text-decoration:none;color:var(--ink)}.result-correct{border-left:4px solid #198754}.result-wrong{border-left:4px solid #b45555}th,td{padding:1rem!important}.save-failed{color:#a12626!important}@media(max-width:575px){.nav-links{gap:.65rem;font-size:.86rem}.site-header nav{gap:.75rem}.answer-option{padding:.9rem}.selection-bar{bottom:.5rem}.quiz-card .card-body{padding:1.25rem!important}th,td{padding:.75rem!important}}

.battle-countdown{font-size:5rem;text-align:center;padding:2rem}.battle-timer{font-size:1.6rem;font-variant-numeric:tabular-nums}.battle-progress{width:100%;height:.6rem;margin-top:.5rem;accent-color:var(--bs-primary)}#battle-room .option-card{cursor:pointer;border:1px solid var(--bs-border-color);border-radius:.6rem;padding:1rem}#battle-room .option-card:has(input:checked){border-color:var(--bs-primary);background:var(--bs-primary-bg-subtle)}