.math-mine-hero {
    grid-template-columns: minmax(0, 1fr);
    gap: 10px;
    max-width: 900px;
    margin: 0 auto 22px;
    padding: 20px 24px;
    text-align: center;
}

.math-mine-page .math-mine-hero .economy-title {
    margin: 0;
    color: #f7f1df;
    font: 800 clamp(2rem, 5vw, 3.7rem)/1.04 var(--font-mono);
    letter-spacing: -.055em;
    text-transform: none;
}

.math-mine-page .math-mine-hero .economy-subtitle {
    max-width: 720px;
    margin: 0 auto;
}

.mine-board-wrap {
    margin: -8px 0 24px;
    padding: 12px;
    border: 1px solid rgba(121, 226, 255, .22);
    border-radius: 18px;
    background: linear-gradient(180deg, rgba(15, 32, 66, .8), rgba(11, 14, 43, .9));
}

.mine-board__topline {
    display: flex;
    justify-content: space-between;
    gap: 12px;
    margin: 0 4px 8px;
    color: #b7d7e8;
    font-size: .76rem;
}

.mine-board__topline span:last-child { color: #ffad71; }

#mineCanvas {
    display: block;
    width: 100%;
    height: auto;
    min-height: 150px;
    border-radius: 12px;
    background: #101833;
    touch-action: none;
}

.math-problem {
    margin-top: 18px;
    padding: 20px;
    border: 1px solid rgba(255, 211, 82, .32);
    border-radius: 16px;
    background: linear-gradient(135deg, rgba(255, 211, 82, .1), rgba(82, 201, 255, .08));
}

.math-problem[hidden],
.math-form[hidden] {
    display: none !important;
}

.math-problem .math-question {
    margin: 0 0 18px;
}

.mine-controls {
    display: grid;
    grid-template-columns: 1fr 1fr 1fr;
    gap: 8px;
    margin-top: 10px;
}

.mine-control {
    min-height: 42px;
    padding: 8px 10px;
    border: 1px solid rgba(134, 215, 255, .3);
    border-radius: 12px;
    color: #dff7ff;
    background: rgba(71, 143, 191, .16);
    font: 700 .78rem var(--font-mono);
    cursor: pointer;
    touch-action: manipulation;
    -webkit-tap-highlight-color: transparent;
}

.mine-control:active { transform: scale(.97); background: rgba(71, 143, 191, .35); }
.mine-control:disabled { opacity: .4; cursor: not-allowed; }
.mine-control--collect { color: #251900; background: linear-gradient(135deg, #ffe071, #ffb52e); }

.character-picker {
    margin-top: 20px;
    padding-top: 16px;
    border-top: 1px solid rgba(255,255,255,.1);
    text-align: left;
}

.character-picker__heading {
    display: flex;
    justify-content: space-between;
    align-items: center;
    gap: 10px;
}

.character-picker h2 { margin: 0; font: 700 1rem var(--font-mono); }
.character-picker a { color: var(--economy-gold); font-size: .75rem; }

.character-picker__list {
    display: flex;
    flex-wrap: wrap;
    gap: 7px;
    margin-top: 10px;
}

.character-option {
    display: inline-flex;
    align-items: center;
    gap: 6px;
    padding: 7px 9px;
    border: 1px solid rgba(255,255,255,.14);
    border-radius: 999px;
    color: #cfdae9;
    background: rgba(255,255,255,.05);
    font-size: .75rem;
    cursor: pointer;
}

.character-option.is-equipped { border-color: #ffd45a; color: #fff4c7; background: rgba(255, 212, 90, .16); }
.character-option.is-locked { opacity: .62; cursor: default; }

@media (max-width: 560px) {
    .math-mine-hero { gap: 8px; padding: 16px; }
    .math-mine-page .economy-topbar__inner { gap: 6px; }
    .math-mine-page .economy-nav { gap: 2px; }
    .math-mine-page .economy-nav a[href="/feedback/"] { display: none; }
    .math-mine-page .coin-balance { min-width: 64px; padding-inline: 9px; }
    .math-mine-page .math-mine-hero .economy-title {
        font-size: clamp(1.85rem, 10vw, 2.7rem);
        letter-spacing: -.045em;
    }
    .mine-board-wrap { padding: 8px; }
    .mine-board__topline { flex-direction: column; gap: 3px; font-size: .7rem; }
    .mine-controls { grid-template-columns: 1fr 1fr; }
    .mine-control--collect { grid-column: 1 / -1; grid-row: 1; }
    .math-problem { padding: 16px 12px; }
}