:root {
    color-scheme: dark;
    --bg: #0c1420;
    --panel: #16243a;
    --panel-2: #1f3454;
    --primary: #60a5fa;
    --primary-2: #93c5fd;
    --accent: #10b981;
    --danger: #ef4444;
    --warning: #f59e0b;
    --text: #e2eaf6;
    --muted: #94a3b8;
    --border: rgba(255, 255, 255, 0.10);
}

* { box-sizing: border-box; }

html, body {
    min-height: 100%;
    margin: 0;
    -webkit-tap-highlight-color: transparent;
}

body {
    min-height: 100vh;
    background: radial-gradient(ellipse at top, #1e3a5f 0, var(--bg) 50%);
    color: var(--text);
    font-family: Inter, ui-sans-serif, system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
    line-height: 1.5;
}

button {
    border: 0;
    border-radius: 8px;
    font: inherit;
    cursor: pointer;
    transition: filter 0.15s ease, transform 0.05s ease;
}
button:active { transform: scale(0.98); }
button:focus-visible { outline: 3px solid #fff; outline-offset: 2px; }

.quiz-shell {
    width: min(100%, 760px);
    margin: 0 auto;
    padding: 16px;
    min-height: 100vh;
}

/* ─── Screens ─── */
.screen { display: none; animation: fade-in 0.3s ease; }
.screen.active { display: block; }
@keyframes fade-in { from { opacity: 0; transform: translateY(8px); } to { opacity: 1; transform: none; } }

/* ━━━━━━━━━━━━━━━━ TELA 1: SELEÇÃO ━━━━━━━━━━━━━━━━ */
.hero {
    padding: 24px 8px 8px;
    text-align: center;
}
.eyebrow {
    color: var(--primary);
    font-size: 12px;
    font-weight: 800;
    text-transform: uppercase;
    letter-spacing: 1.5px;
    margin: 0 0 8px;
}
.hero h1 {
    margin: 0 0 8px;
    font-size: clamp(28px, 6vw, 36px);
    line-height: 1.1;
    font-weight: 900;
}
.subtitle {
    color: var(--muted);
    margin: 0 auto;
    max-width: 480px;
    font-size: 14px;
}
.fases-grid {
    margin-top: 24px;
    display: grid;
    grid-template-columns: 1fr;
    gap: 12px;
}
@media (min-width: 640px) {
    .fases-grid { grid-template-columns: 1fr 1fr; }
}

.fase-card {
    position: relative;
    display: flex;
    flex-direction: column;
    overflow: hidden;
    border: 1px solid var(--border);
    border-radius: 12px;
    background: var(--panel);
    padding: 16px;
    text-align: left;
    color: inherit;
    transition: border-color 0.2s, transform 0.15s, box-shadow 0.15s;
    cursor: pointer;
}
.fase-card:hover {
    border-color: var(--primary);
    transform: translateY(-2px);
    box-shadow: 0 14px 30px rgba(0, 0, 0, 0.35);
}
.fase-card .fase-tipo {
    display: inline-flex;
    align-items: center;
    gap: 4px;
    background: rgba(96, 165, 250, 0.15);
    color: var(--primary);
    padding: 3px 8px;
    border-radius: 999px;
    font-size: 10px;
    font-weight: 700;
    text-transform: uppercase;
    letter-spacing: 0.5px;
    width: fit-content;
}
.fase-card .fase-conquistada {
    background: rgba(16, 185, 129, 0.15);
    color: var(--accent);
}
.fase-card .fase-nome {
    margin: 8px 0 4px;
    font-size: 17px;
    font-weight: 800;
}
.fase-card .fase-desc {
    color: var(--muted);
    font-size: 13px;
    margin: 0 0 12px;
    line-height: 1.4;
    display: -webkit-box;
    -webkit-line-clamp: 2;
    -webkit-box-orient: vertical;
    overflow: hidden;
}
.fase-card .fase-stats {
    display: flex;
    align-items: center;
    gap: 12px;
    margin-top: auto;
    padding-top: 12px;
    border-top: 1px solid var(--border);
    font-size: 12px;
    color: var(--muted);
}
.fase-card .fase-stats strong { color: var(--text); }
.fase-card .conquista-icon-mini {
    position: absolute;
    top: 12px;
    right: 12px;
    font-size: 22px;
    filter: drop-shadow(0 2px 4px rgba(0, 0, 0, 0.4));
}

.loading { color: var(--muted); text-align: center; padding: 32px; }

/* ━━━━━━━━━━━━━━━━ TELA 2: QUIZ ━━━━━━━━━━━━━━━━ */
.quiz-header {
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 12px;
    padding: 8px 0 16px;
    border-bottom: 1px solid var(--border);
    margin-bottom: 16px;
}
.ghost-btn {
    background: rgba(255, 255, 255, 0.05);
    color: var(--text);
    padding: 8px 12px;
    font-size: 13px;
    font-weight: 600;
}
.ghost-btn:hover { background: rgba(255, 255, 255, 0.10); }

.quiz-meta {
    flex: 1;
    text-align: center;
    overflow: hidden;
}
.fase-nome-header {
    display: block;
    font-size: 13px;
    font-weight: 700;
    color: var(--text);
    margin-top: 2px;
    white-space: nowrap;
    overflow: hidden;
    text-overflow: ellipsis;
}
.badge {
    display: inline-block;
    background: rgba(96, 165, 250, 0.15);
    color: var(--primary);
    padding: 3px 10px;
    border-radius: 999px;
    font-size: 10px;
    font-weight: 800;
    text-transform: uppercase;
    letter-spacing: 0.5px;
}
.timer {
    font-variant-numeric: tabular-nums;
    font-weight: 700;
    color: var(--muted);
    font-size: 14px;
}

.progress { margin-bottom: 20px; }
.progress-info {
    color: var(--muted);
    font-size: 12px;
    font-weight: 600;
    margin-bottom: 6px;
    display: flex;
    justify-content: space-between;
}
.progress-info span { color: var(--text); font-weight: 800; font-variant-numeric: tabular-nums; }
.progress-bar {
    height: 6px;
    background: rgba(255, 255, 255, 0.08);
    border-radius: 999px;
    overflow: hidden;
}
.progress-fill {
    height: 100%;
    width: 0%;
    background: linear-gradient(90deg, var(--primary), var(--primary-2));
    transition: width 0.3s ease;
}

.pergunta-card {
    background: var(--panel);
    border: 1px solid var(--border);
    border-radius: 12px;
    padding: 24px 20px;
    box-shadow: 0 14px 30px rgba(0, 0, 0, 0.30);
}
.enunciado {
    font-size: clamp(17px, 4vw, 20px);
    font-weight: 700;
    line-height: 1.4;
    margin: 0 0 20px;
}
.alternativas {
    display: grid;
    gap: 10px;
}
.alt-btn {
    display: flex;
    align-items: center;
    gap: 12px;
    background: rgba(255, 255, 255, 0.04);
    border: 2px solid var(--border);
    color: var(--text);
    padding: 14px 16px;
    text-align: left;
    font-size: 15px;
    font-weight: 500;
    width: 100%;
}
.alt-btn:hover:not(:disabled) {
    background: rgba(96, 165, 250, 0.10);
    border-color: var(--primary);
}
.alt-btn .alt-letter {
    flex: 0 0 28px;
    height: 28px;
    border-radius: 50%;
    display: grid;
    place-items: center;
    background: rgba(255, 255, 255, 0.10);
    font-weight: 800;
    font-size: 13px;
    color: var(--muted);
}
.alt-btn:hover:not(:disabled) .alt-letter { background: var(--primary); color: #06121f; }
.alt-btn.selected {
    background: rgba(96, 165, 250, 0.18);
    border-color: var(--primary);
}
.alt-btn.selected .alt-letter { background: var(--primary); color: #06121f; }

.alt-btn.correct {
    background: rgba(16, 185, 129, 0.18);
    border-color: var(--accent);
    color: #d1fae5;
}
.alt-btn.correct .alt-letter { background: var(--accent); color: #064e3b; }

.alt-btn.wrong {
    background: rgba(239, 68, 68, 0.15);
    border-color: var(--danger);
}
.alt-btn.wrong .alt-letter { background: var(--danger); color: white; }

.alt-btn:disabled { cursor: default; opacity: 1; }

/* ━━━━━━━━━━━━━━━━ TELA 3: RESULTADO ━━━━━━━━━━━━━━━━ */
.resultado-card {
    background: var(--panel);
    border: 1px solid var(--border);
    border-radius: 16px;
    padding: 32px 24px;
    text-align: center;
    margin-top: 24px;
    box-shadow: 0 20px 40px rgba(0, 0, 0, 0.4);
}
.resultado-emoji { font-size: 64px; line-height: 1; margin-bottom: 8px; }
.resultado-card h1 {
    margin: 0 0 8px;
    font-size: clamp(28px, 6vw, 36px);
    font-weight: 900;
}
.resultado-card .subtitle { margin-bottom: 24px; }

.stats-final {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 8px;
    margin: 20px 0;
}
.stats-final .stat {
    background: rgba(255, 255, 255, 0.04);
    border: 1px solid var(--border);
    border-radius: 10px;
    padding: 12px 6px;
}
.stats-final .label {
    display: block;
    color: var(--muted);
    font-size: 10px;
    font-weight: 700;
    text-transform: uppercase;
    letter-spacing: 0.5px;
    margin-bottom: 4px;
}
.stats-final strong {
    font-size: clamp(18px, 5vw, 24px);
    font-weight: 900;
    color: var(--primary-2);
    font-variant-numeric: tabular-nums;
}

.conquista-banner {
    display: flex;
    align-items: center;
    gap: 12px;
    background: linear-gradient(135deg, rgba(245, 158, 11, 0.15), rgba(239, 68, 68, 0.15));
    border: 1px solid var(--warning);
    border-radius: 12px;
    padding: 14px 16px;
    margin: 20px 0;
    text-align: left;
    animation: shimmer 2s ease infinite;
}
@keyframes shimmer {
    0%, 100% { box-shadow: 0 0 0 0 rgba(245, 158, 11, 0.3); }
    50%      { box-shadow: 0 0 0 8px rgba(245, 158, 11, 0); }
}
.conquista-icon { font-size: 32px; }
.conquista-title { margin: 0; font-size: 11px; font-weight: 800; text-transform: uppercase; color: var(--warning); letter-spacing: 0.5px; }
.conquista-name { margin: 2px 0 0; font-size: 16px; font-weight: 800; color: var(--text); }

.gabarito {
    margin-top: 20px;
    text-align: left;
    background: rgba(255, 255, 255, 0.03);
    border: 1px solid var(--border);
    border-radius: 10px;
    padding: 12px 16px;
}
.gabarito summary {
    cursor: pointer;
    font-weight: 600;
    color: var(--muted);
    font-size: 13px;
    user-select: none;
}
.gabarito summary:hover { color: var(--text); }
.gabarito-item {
    padding: 12px 0;
    border-bottom: 1px solid var(--border);
}
.gabarito-item:last-child { border: 0; }
.gabarito-item .gq {
    font-weight: 600;
    margin: 0 0 6px;
    font-size: 13px;
}
.gabarito-item .ga {
    font-size: 12px;
    margin: 2px 0;
    color: var(--muted);
}
.gabarito-item .ga.correct { color: var(--accent); font-weight: 600; }
.gabarito-item .gexp {
    font-size: 12px;
    margin: 6px 0 0;
    padding: 8px 10px;
    background: rgba(96, 165, 250, 0.08);
    border-left: 3px solid var(--primary);
    border-radius: 4px;
    color: var(--text);
}

.resultado-actions {
    display: flex;
    gap: 8px;
    margin-top: 24px;
    flex-wrap: wrap;
    justify-content: center;
}
.primary-btn {
    background: var(--primary);
    color: #06121f;
    padding: 12px 24px;
    font-size: 14px;
    font-weight: 800;
    min-width: 160px;
}
.primary-btn:hover { filter: brightness(1.1); }
.secondary-btn {
    background: rgba(255, 255, 255, 0.06);
    color: var(--text);
    padding: 12px 24px;
    font-size: 14px;
    font-weight: 600;
    min-width: 140px;
}
.secondary-btn:hover { background: rgba(255, 255, 255, 0.12); }