/* ════════════════════════════════════════
   Math Game for Kids — CSS Dark Theme
   ════════════════════════════════════════ */

@import url('https://fonts.googleapis.com/css2?family=Quicksand:wght@500;700;800&display=swap');

:root {
    --mgk-bg:         #1a1a2e;
    --mgk-bg2:        #16213e;
    --mgk-card:       #0f3460;
    --mgk-primary:    #e94560;
    --mgk-gold:       #f5a623;
    --mgk-teal:       #4ecdc4;
    --mgk-text:       #eaeaea;
    --mgk-text-dim:   #a0a8c0;
    --mgk-success:    #2ecc71;
    --mgk-error:      #e74c3c;
    --mgk-radius:     14px;
    --mgk-font:       'Quicksand', 'Segoe UI', sans-serif;
}

/* ── Container ── */
.mgk-wrap {
    font-family: var(--mgk-font);
    background: var(--mgk-bg);
    width: 100%;
    max-width: 560px;
    margin: 0 auto;
    padding: 28px 24px;
    border-radius: 24px;
    box-shadow: 0 20px 60px rgba(0,0,0,.5);
    text-align: center;
    box-sizing: border-box;
    color: var(--mgk-text);
}

/* ── Screens ── */
.mgk-screen        { display: none; }
.mgk-screen.active { display: block; animation: mgkFadeIn .28s ease; }
@keyframes mgkFadeIn { from { opacity:0; transform:translateY(10px); } to { opacity:1; transform:none; } }

/* ══════════ MENU ══════════ */

.mgk-title {
    color: var(--mgk-gold);
    font-size: 2rem;
    font-weight: 800;
    margin: 0 0 22px;
    text-transform: uppercase;
    letter-spacing: .04em;
    text-shadow: 0 2px 12px rgba(245,166,35,.4);
}

.mgk-form-group { margin-bottom: 20px; text-align: left; }

.mgk-label {
    display: block;
    font-weight: 700;
    font-size: .95rem;
    color: var(--mgk-text-dim);
    margin-bottom: 9px;
    text-transform: uppercase;
    letter-spacing: .05em;
    font-size: .8rem;
}

.mgk-text-input {
    width: 100%;
    padding: 13px 16px;
    border: 2px solid rgba(255,255,255,.1);
    border-radius: var(--mgk-radius);
    font-size: 1rem;
    font-family: var(--mgk-font);
    font-weight: 600;
    outline: none;
    transition: border-color .2s, background .2s;
    box-sizing: border-box;
    background: rgba(255,255,255,.07);
    color: var(--mgk-text);
}
.mgk-text-input::placeholder { color: rgba(255,255,255,.3); }
.mgk-text-input:focus { border-color: var(--mgk-teal); background: rgba(255,255,255,.1); }

/* ── Operation radio cards ── */
.mgk-radio   { display: none; }
.mgk-op-grid { display: grid; grid-template-columns: repeat(4, 1fr); gap: 8px; }
.mgk-op-label { cursor: pointer; display: block; }

.mgk-op-card {
    background: rgba(255,255,255,.06);
    border: 2px solid rgba(255,255,255,.1);
    padding: 14px 6px;
    border-radius: var(--mgk-radius);
    font-weight: 700;
    font-size: .85rem;
    color: var(--mgk-text);
    transition: all .18s;
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 6px;
    user-select: none;
}
.mgk-op-card:hover { background: rgba(255,255,255,.12); border-color: var(--mgk-teal); }
.mgk-op-icon { font-size: 1.5rem; line-height: 1; }
.mgk-radio:checked + .mgk-op-card {
    background: var(--mgk-teal);
    border-color: var(--mgk-teal);
    color: #1a1a2e;
    transform: scale(1.05);
    box-shadow: 0 4px 16px rgba(78,205,196,.45);
}

/* ── Level radio cards ── */
.mgk-level-grid  { display: flex; gap: 8px; }
.mgk-level-label { flex: 1; cursor: pointer; display: block; }

.mgk-level-card {
    padding: 14px 8px;
    border-radius: 50px;
    border: 2px solid rgba(255,255,255,.1);
    font-weight: 700;
    font-size: .8rem;
    transition: all .18s;
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 3px;
    background: rgba(255,255,255,.06);
    color: var(--mgk-text);
    user-select: none;
    text-align: center;
}
.mgk-level-emoji { font-size: 1.3rem; line-height: 1; }
.mgk-level-name  { font-size: .88rem; font-weight: 700; }
.mgk-level-card small { font-size: .68rem; opacity: .6; }

.mgk-radio:checked + .mgk-level-card.mgk-level-easy   { background: #27ae60; border-color: #2ecc71; color: #fff; box-shadow: 0 4px 14px rgba(46,204,113,.4); }
.mgk-radio:checked + .mgk-level-card.mgk-level-medium { background: #e67e22; border-color: #f39c12; color: #fff; box-shadow: 0 4px 14px rgba(243,156,18,.4); }
.mgk-radio:checked + .mgk-level-card.mgk-level-hard   { background: #c0392b; border-color: #e74c3c; color: #fff; box-shadow: 0 4px 14px rgba(231,76,60,.4); }

/* ── Start button ── */
.mgk-start-btn {
    display: block;
    width: 100%;
    background: linear-gradient(135deg, var(--mgk-gold), #e67e22);
    color: #1a1a2e;
    border: none;
    padding: 17px 40px;
    font-size: 1.15rem;
    font-weight: 800;
    font-family: var(--mgk-font);
    border-radius: 50px;
    cursor: pointer;
    margin-top: 24px;
    box-shadow: 0 6px 0 #b7590a, 0 8px 20px rgba(245,166,35,.4);
    transition: background .15s, transform .1s, box-shadow .1s;
    text-transform: uppercase;
    letter-spacing: .06em;
}
.mgk-start-btn:hover  { background: linear-gradient(135deg, #ffc107, var(--mgk-gold)); }
.mgk-start-btn:active { transform: translateY(4px); box-shadow: 0 2px 0 #b7590a; }

/* ══════════ GAME SCREEN ══════════ */

.mgk-game-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 12px;
}
.mgk-stat span  { font-size: 1.8rem; font-weight: 800; color: var(--mgk-gold); display: block; }
.mgk-stat small { font-size: .65rem; color: var(--mgk-text-dim); text-transform: uppercase; letter-spacing: .06em; }

.mgk-timer {
    background: rgba(245,166,35,.15);
    border: 2px solid var(--mgk-gold);
    border-radius: 50px;
    padding: 8px 20px;
    font-weight: 800;
    font-size: 1.3rem;
    color: var(--mgk-gold);
    min-width: 80px;
}
.mgk-timer.warn { background: rgba(231,76,60,.2); border-color: var(--mgk-error); color: var(--mgk-error); animation: mgkPulse .5s infinite; }
@keyframes mgkPulse { 0%,100% { transform:scale(1); } 50% { transform:scale(1.07); } }

.mgk-progress-bar  { height: 6px; background: rgba(255,255,255,.1); border-radius: 3px; margin-bottom: 16px; overflow: hidden; }
.mgk-progress-fill { height: 100%; background: linear-gradient(90deg, var(--mgk-teal), var(--mgk-gold)); transition: width .35s; border-radius: 3px; }

/* Question card */
.mgk-question-card {
    background: var(--mgk-bg2);
    border: 2px solid rgba(255,255,255,.08);
    border-radius: 20px;
    padding: 28px 20px 18px;
    margin-bottom: 16px;
    min-height: 110px;
}
.mgk-question-num { font-size: .72rem; color: var(--mgk-text-dim); font-weight: 700; text-transform: uppercase; letter-spacing: .08em; margin-bottom: 8px; }
.mgk-question     { font-size: 2.6rem; font-weight: 800; color: #fff; line-height: 1.2; }
.mgk-feedback     { font-size: .95rem; font-weight: 700; margin-top: 10px; min-height: 24px; }
.mgk-feedback.correct { color: var(--mgk-success); }
.mgk-feedback.wrong   { color: var(--mgk-error); }

/* ── 4 choice buttons ── */
.mgk-choices {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 10px;
    margin-bottom: 16px;
}

.mgk-choice-btn {
    padding: 18px 12px;
    font-size: 1.4rem;
    font-weight: 800;
    font-family: var(--mgk-font);
    background: rgba(255,255,255,.07);
    border: 2px solid rgba(255,255,255,.12);
    border-radius: var(--mgk-radius);
    cursor: pointer;
    transition: all .15s;
    color: #fff;
    min-height: 66px;
}
.mgk-choice-btn:hover:not(:disabled) {
    background: rgba(78,205,196,.15);
    border-color: var(--mgk-teal);
    transform: translateY(-2px);
    box-shadow: 0 4px 16px rgba(78,205,196,.25);
}
.mgk-choice-btn:active:not(:disabled) { transform: translateY(1px); }
.mgk-choice-btn:disabled { cursor: default; }

.mgk-choice-btn.correct {
    background: rgba(46,204,113,.2);
    border-color: var(--mgk-success);
    color: #2ecc71;
    transform: scale(1.04);
    box-shadow: 0 0 18px rgba(46,204,113,.35);
}
.mgk-choice-btn.wrong {
    background: rgba(231,76,60,.2);
    border-color: var(--mgk-error);
    color: #e74c3c;
    animation: mgkShake .35s ease;
}
@keyframes mgkShake { 0%,100% { transform:none; } 25% { transform:translateX(-6px); } 75% { transform:translateX(6px); } }

/* Quick stats */
.mgk-quick-stats   { display: flex; justify-content: center; gap: 28px; font-size: .9rem; font-weight: 700; }
.mgk-correct-count { color: var(--mgk-success); }
.mgk-wrong-count   { color: var(--mgk-error); }

/* ══════════ RESULT SCREEN ══════════ */

.mgk-result-hero  { margin-bottom: 18px; }
.mgk-result-emoji { font-size: 64px; display: block; animation: mgkBounce .55s ease; }
@keyframes mgkBounce { 0%,100% { transform:none; } 40% { transform:scale(1.2); } 70% { transform:scale(.94); } }
.mgk-result-hero h2 { font-size: 1.8rem; font-weight: 800; color: var(--mgk-gold); margin: 8px 0 0; }

.mgk-result-stats {
    display: grid;
    grid-template-columns: repeat(4,1fr);
    gap: 8px;
    margin-bottom: 18px;
}
.mgk-result-stat  { background: var(--mgk-bg2); border: 1px solid rgba(255,255,255,.08); border-radius: var(--mgk-radius); padding: 14px 6px; }
.mgk-result-stat span  { font-size: 1.5rem; font-weight: 800; color: var(--mgk-gold); display: block; }
.mgk-result-stat small { font-size: .65rem; color: var(--mgk-text-dim); text-transform: uppercase; letter-spacing: .06em; }

/* Badges */
.mgk-new-badges     { display: flex; flex-wrap: wrap; gap: 8px; justify-content: center; margin-bottom: 16px; }
.mgk-badge-title    { width: 100%; font-weight: 700; font-size: .88rem; margin: 0 0 4px; color: var(--mgk-text-dim); }
.mgk-new-badge-item { background: rgba(245,166,35,.2); border: 1px solid var(--mgk-gold); border-radius: 50px; padding: 5px 14px; font-size: .82rem; font-weight: 700; color: var(--mgk-gold); }

/* ── Leaderboard embedded in result ── */
.mgk-lb-section  { margin-bottom: 18px; text-align: left; }
.mgk-lb-heading  {
    font-size: 1rem; font-weight: 800; color: var(--mgk-gold);
    margin: 0 0 10px; text-align: center;
    display: flex; align-items: center; justify-content: center; gap: 6px;
    text-transform: uppercase; letter-spacing: .06em;
}

.mgk-lb-loading, .mgk-lb-empty { text-align: center; padding: 16px; color: var(--mgk-text-dim); font-size: .88rem; }
.mgk-lb-error { color: var(--mgk-error); font-size: .82rem; text-align: center; padding: 8px 12px; background: rgba(231,76,60,.1); border-radius: 8px; margin-bottom: 6px; word-break: break-word; }
.mgk-lb-hint  { font-size: .75rem; color: var(--mgk-text-dim); text-align: center; padding: 0 8px; }

.mgk-lb-table {
    width: 100%;
    border-collapse: collapse;
    font-size: .85rem;
    border-radius: 12px;
    overflow: hidden;
}
.mgk-lb-table thead tr { background: rgba(255,255,255,.06); }
.mgk-lb-table th { padding: 10px 12px; text-align: left; font-weight: 700; color: var(--mgk-text-dim); text-transform: uppercase; font-size: .72rem; letter-spacing: .05em; }
.mgk-lb-table td { padding: 9px 12px; border-bottom: 1px solid rgba(255,255,255,.05); color: var(--mgk-text); }
.mgk-lb-table tbody tr:last-child td { border-bottom: none; }
.mgk-lb-table tbody tr:hover td { background: rgba(255,255,255,.04); }

.mgk-lb-top:nth-child(1) td { color: #ffd700; }
.mgk-lb-top:nth-child(2) td { color: #c0c0c0; }
.mgk-lb-top:nth-child(3) td { color: #cd7f32; }

.mgk-lb-me td { background: rgba(78,205,196,.1) !important; }
.mgk-lb-you {
    display: inline-block;
    background: var(--mgk-teal);
    color: #1a1a2e;
    font-size: .65rem;
    padding: 1px 7px;
    border-radius: 50px;
    margin-left: 5px;
    vertical-align: middle;
    font-weight: 800;
    text-transform: uppercase;
}

/* Result action buttons */
.mgk-result-actions { display: flex; gap: 10px; }
.mgk-result-actions .mgk-start-btn { margin-top: 0; flex: 1; font-size: 1rem; padding: 15px 20px; }
.mgk-back-btn {
    flex: 0 0 auto;
    padding: 15px 20px;
    background: rgba(255,255,255,.08);
    color: var(--mgk-text);
    border: 2px solid rgba(255,255,255,.12);
    border-radius: 50px;
    font-size: 1rem;
    font-weight: 700;
    font-family: var(--mgk-font);
    cursor: pointer;
    transition: all .15s;
}
.mgk-back-btn:hover  { background: rgba(255,255,255,.14); }
.mgk-back-btn:active { transform: scale(.97); }

/* ══════════ STANDALONE SHORTCODES ══════════ */

.mgk-leaderboard { font-family: var(--mgk-font); }
.mgk-leaderboard h3 { font-size: 1.1rem; font-weight: 700; margin-bottom: 12px; }

.mgk-badges-wrap h3   { font-size: 1.1rem; margin-bottom: 12px; }
.mgk-badges-grid      { display: grid; grid-template-columns: repeat(auto-fill,minmax(120px,1fr)); gap: 10px; }
.mgk-badge-card       { background: rgba(255,255,255,.05); border-radius: var(--mgk-radius); padding: 14px 8px; text-align: center; border: 2px solid rgba(255,255,255,.08); transition: transform .2s; }
.mgk-badge-card:hover { transform: translateY(-3px); }
.mgk-badge-card.locked { opacity: .35; filter: grayscale(1); }
.mgk-badge-icon       { font-size: 2rem; margin-bottom: 4px; }
.mgk-badge-label      { font-weight: 700; font-size: .8rem; color: var(--mgk-text); margin-bottom: 2px; }
.mgk-badge-desc       { font-size: .68rem; color: var(--mgk-text-dim); }

/* ══════════ RESPONSIVE ══════════ */

@media (max-width: 480px) {
    .mgk-wrap       { padding: 18px 14px; border-radius: 18px; }
    .mgk-title      { font-size: 1.6rem; }
    .mgk-op-grid    { grid-template-columns: repeat(2,1fr); }
    .mgk-question   { font-size: 2rem; }
    .mgk-choice-btn { font-size: 1.15rem; padding: 14px 8px; min-height: 58px; }
    .mgk-result-stats { grid-template-columns: 1fr 1fr; }
    .mgk-result-actions { flex-direction: column; }
    .mgk-back-btn   { width: 100%; }
}

/* ── Leaderboard level tabs ── */
.mgk-lb-tabs {
    display: flex;
    gap: 6px;
    margin-bottom: 12px;
    flex-wrap: wrap;
}
.mgk-lb-tab {
    flex: 1;
    padding: 8px 6px;
    background: rgba(255,255,255,.06);
    border: 2px solid rgba(255,255,255,.1);
    border-radius: 50px;
    color: var(--mgk-text-dim);
    font-family: var(--mgk-font);
    font-size: .78rem;
    font-weight: 700;
    cursor: pointer;
    transition: all .18s;
    white-space: nowrap;
}
.mgk-lb-tab:hover  { background: rgba(255,255,255,.1); color: var(--mgk-text); }
.mgk-lb-tab.active {
    background: var(--mgk-gold);
    border-color: var(--mgk-gold);
    color: #1a1a2e;
    box-shadow: 0 3px 12px rgba(245,166,35,.4);
}

/* Level badges inside table */
.mgk-lb-badge {
    display: inline-block;
    padding: 2px 10px;
    border-radius: 50px;
    font-size: .7rem;
    font-weight: 700;
}
.mgk-lb-badge--easy   { background: rgba(39,174,96,.2);  color: #2ecc71; border: 1px solid #27ae60; }
.mgk-lb-badge--medium { background: rgba(230,126,34,.2); color: #f39c12; border: 1px solid #e67e22; }
.mgk-lb-badge--hard   { background: rgba(192,57,43,.2);  color: #e74c3c; border: 1px solid #c0392b; }