* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

/* Map local Talsmia variable names to the neobrutalisme theme variables
   (defined by [data-theme="candy"] / [data-theme="neon"] in neobrutalisme.css).
   Uses body[data-theme] to override the theme-variable definitions. */
body[data-theme] {
    --bg-color: var(--bg);
    --card-bg: var(--surface);
    --accent-green: var(--accent4);
    --accent-blue: var(--accent3);
    --accent-pink: var(--accent);
    --accent-yellow: var(--accent3);
    --accent-orange: var(--accent5);
    --accent-purple: var(--accent);
    --accent-teal: var(--accent2);
    /* talsmia-specific full-shadow vars (avoid clashing with neo --shadow colour) */
    --ts-shadow: 6px 6px 0 var(--shadow);
    --ts-shadow-hover: 10px 10px 0 var(--shadow);
    --ts-shadow-accent: 6px 6px 0 var(--accent2);
}
body {
    font-family: 'Arial Black', 'Arial Bold', Arial, system-ui, sans-serif;
    background-color: var(--bg);
    min-height: 100vh;
    color: var(--text);
}

.container {
    max-width: 1200px;
    width: 100%;
    margin: 0 auto;
    padding: 24px;
}

header {
    background: var(--card-bg);
    border: 3px solid var(--border);
    box-shadow: var(--ts-shadow);
    padding: 24px 32px;
    margin-bottom: 32px;
    text-align: center;
}

h1 {
    font-size: clamp(1.8rem, 5vw, 2.5rem);
    font-weight: 900;
    text-transform: uppercase;
    letter-spacing: -1px;
    margin-bottom: 8px;
}

.subtitle {
    font-family: Arial, system-ui, sans-serif;
    font-size: 0.95rem;
    font-weight: 600;
}

.screen {
    display: none;
    background: var(--card-bg);
    border: 3px solid var(--border);
    box-shadow: var(--ts-shadow);
    padding: 32px;
    margin-bottom: 24px;
}

.screen.active {
    display: block;
}

.btn {
    display: inline-block;
    background: var(--card-bg);
    color: var(--border);
    border: 3px solid var(--border);
    box-shadow: 4px 4px 0 var(--border);
    padding: 12px 24px;
    font-size: 1rem;
    font-weight: 900;
    text-transform: uppercase;
    letter-spacing: 0.5px;
    cursor: pointer;
    transition: transform 0.1s, box-shadow 0.1s;
    font-family: inherit;
}

.btn:hover {
    transform: translate(-2px, -2px);
    box-shadow: var(--ts-shadow-hover);
}

.btn:active {
    transform: translate(2px, 2px);
    box-shadow: 2px 2px 0 var(--border);
}

.btn:disabled {
    opacity: 0.5;
    cursor: not-allowed;
    transform: none;
}

.btn.selected {
    background: var(--accent-purple);
    color: var(--text-on-accent);
    box-shadow: var(--ts-shadow-accent);
}

.mode-selector,
.time-selector,
.number-controls,
.classroom-controls,
.classroom-timer-controls {
    display: flex;
    flex-wrap: wrap;
    gap: 12px;
    justify-content: center;
    margin: 20px 0;
}

.btn-time {
    min-width: 64px;
    padding: 8px 14px;
    font-size: 0.9rem;
}

.timer-container {
    text-align: center;
    margin-bottom: 16px;
}

#timer,
#timer-manual,
#timer-classroom {
    font-size: 2.5rem;
    font-weight: 900;
    display: inline-block;
    padding: 8px 24px;
    background: var(--accent-blue);
    border: 3px solid var(--border);
    box-shadow: var(--ts-shadow-accent);
}

.warning {
    background: var(--accent-orange) !important;
}

.danger {
    background: var(--accent-pink) !important;
    animation: pulse 1s infinite;
}

@keyframes pulse {
    0%,
    100% {
        transform: scale(1);
    }
    50% {
        transform: scale(1.05);
    }
}

.target-box {
    text-align: center;
    margin: 8px 0 18px;
}

.target-label {
    font-size: 0.9rem;
    text-transform: uppercase;
    margin-bottom: 6px;
}

.target-value {
    display: inline-block;
    background: var(--accent-purple);
    border: 3px solid var(--border);
    box-shadow: var(--ts-shadow);
    font-size: 2.4rem;
    font-weight: 900;
    min-width: 140px;
    padding: 6px 12px;
    color: #fff;
}

#target-class {
    font-size: 7.2rem;
    min-width: 360px;
    padding: 12px 28px;
}

.hidden-target {
    display: none;
}

.numbers-container {
    display: flex;
    justify-content: center;
    gap: 12px;
    margin: 20px 0;
    flex-wrap: wrap;
}

.number-tile {
    width: 82px;
    height: 82px;
    background: var(--accent-yellow);
    border: 3px solid var(--border);
    box-shadow: var(--ts-shadow-accent);
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 2rem;
    font-weight: 900;
}

#numbers-container-class .number-tile {
    width: 98px;
    height: 98px;
    font-size: 2.3rem;
}

.expr-input {
    display: flex;
    gap: 12px;
    justify-content: center;
    margin: 18px 0;
}

.expr-input input,
.classroom-input {
    font-family: inherit;
    font-size: 1.2rem;
    font-weight: 900;
    padding: 12px 16px;
    border: 3px solid var(--border);
    box-shadow: var(--ts-shadow);
    width: min(760px, 95%);
}

.classroom-input {
    min-height: 120px;
    resize: vertical;
}

.count-display {
    text-align: center;
    font-weight: 900;
    margin-bottom: 10px;
}

.stats-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(150px, 1fr));
    gap: 16px;
    margin: 24px 0;
}

.stat-box {
    background: var(--card-bg);
    border: 3px solid var(--border);
    box-shadow: var(--ts-shadow);
    padding: 16px;
    text-align: center;
}

.stat-value {
    font-size: 2rem;
    font-weight: 900;
    display: block;
}

.stat-label {
    font-size: 0.8rem;
    text-transform: uppercase;
    margin-top: 4px;
}

.history-list {
    max-height: 300px;
    overflow-y: auto;
    border: 3px solid var(--border);
    padding: 16px;
    background: var(--card-bg);
}

.history-item {
    display: flex;
    justify-content: space-between;
    gap: 16px;
    padding: 8px 0;
    border-bottom: 1px solid #ddd;
    font-family: Arial, system-ui, sans-serif;
    font-size: 0.9rem;
}

.history-item:last-child {
    border-bottom: none;
}

.result-section {
    margin: 24px 0;
    padding: 20px;
    border: 3px solid var(--border);
    background: var(--bg-color);
}

.result-hero {
    border: 3px solid var(--border);
    box-shadow: var(--ts-shadow);
    background: #fffef2;
    padding: 16px;
    margin-bottom: 18px;
}

.result-metrics {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(130px, 1fr));
    gap: 10px;
    margin-bottom: 12px;
}

.metric-card {
    border: 3px solid var(--border);
    box-shadow: 4px 4px 0 var(--border);
    padding: 10px 8px;
    text-align: center;
}

.metric-target { background: var(--accent-purple); }
.metric-value-box { background: var(--accent-blue); }
.metric-diff { background: var(--accent-orange); }
.metric-points { background: var(--accent-green); }

.metric-label {
    font-size: 0.78rem;
    font-weight: 900;
    text-transform: uppercase;
    margin-bottom: 4px;
}

.metric-value {
    font-size: 1.6rem;
    font-weight: 900;
    line-height: 1.1;
}

.expression-box {
    border: 3px solid var(--border);
    box-shadow: 4px 4px 0 var(--border);
    background: var(--accent-yellow);
    padding: 10px 12px;
    margin-bottom: 10px;
}

.expression-label {
    font-size: 0.8rem;
    font-weight: 900;
    text-transform: uppercase;
    margin-bottom: 6px;
}

.result-note {
    border: 3px solid var(--border);
    box-shadow: 4px 4px 0 var(--border);
    padding: 10px 12px;
    font-family: Arial, system-ui, sans-serif;
    font-size: 0.92rem;
    font-weight: 700;
}

.result-note-ok { background: #e8ffe1; }
.result-note-bad { background: #ffe2ee; }

.result-title {
    font-size: 1.1rem;
    font-weight: 900;
    text-transform: uppercase;
    margin-bottom: 12px;
}

.your-expression {
    font-size: 1.25rem;
    font-weight: 900;
    color: #0d6b1f;
    margin-bottom: 2px;
    word-break: break-word;
}

.your-expression.invalid {
    color: #c21414;
}

.solution-item {
    background: var(--card-bg);
    border: 2px solid var(--border);
    padding: 10px 12px;
    margin-bottom: 10px;
    font-family: Arial, system-ui, sans-serif;
    font-size: 0.92rem;
    word-break: break-all;
}

.solution-summary {
    font-weight: 800;
    margin-bottom: 6px;
}

.solution-steps {
    margin: 4px 0 0;
    padding: 0;
    display: flex;
    flex-direction: row;
    flex-wrap: wrap;
    align-items: center;
    gap: 8px;
}

.solution-step-box {
    border: 2px solid var(--border);
    box-shadow: 2px 2px 0 var(--border);
    background: #dff3ff;
    padding: 10px 14px;
    font-weight: 700;
    font-size: 1.15rem;
    word-break: break-word;
    display: inline-block;
    width: fit-content;
    max-width: 100%;
}

.solution-step-final {
    background: #ffd86b;
}

.solution-step-arrow {
    text-align: center;
    font-size: 1.8rem;
    font-weight: 900;
    line-height: 1;
    margin: 0;
    color: #000;
}

.help-bar {
    text-align: center;
    margin: 0 0 20px;
}

.help-modal {
    position: fixed;
    inset: 0;
    display: none;
    align-items: center;
    justify-content: center;
    padding: 16px;
    background: rgba(0, 0, 0, 0.45);
    z-index: 999;
}

.help-modal.show {
    display: flex;
}

.help-modal-content {
    width: min(720px, 100%);
    max-height: 85vh;
    overflow: auto;
    background: var(--card-bg);
    border: 3px solid var(--border);
    box-shadow: var(--ts-shadow);
    padding: 20px;
}

.help-modal-content h3 {
    margin-bottom: 10px;
}

.help-modal-content ul {
    margin: 10px 0 14px 20px;
    font-family: Arial, system-ui, sans-serif;
    line-height: 1.5;
}

.help-modal-actions {
    text-align: right;
    margin-top: 12px;
}

footer {
    text-align: center;
    padding: 20px;
    font-size: 0.8rem;
    font-weight: 600;
}

footer a {
    color: var(--border);
}

@media (max-width: 700px) {
    .screen {
        padding: 16px;
    }

    .numbers-container {
        gap: 4px;
        flex-wrap: nowrap;
    }

    .number-tile {
        width: 40px;
        height: 40px;
        font-size: 1.05rem;
        box-shadow: 3px 3px 0 var(--border);
    }

    #numbers-container-class .number-tile {
        width: 42px;
        height: 42px;
        font-size: 1.1rem;
    }

    #timer,
    #timer-manual,
    #timer-classroom {
        font-size: 2rem;
    }

    #target-class {
        font-size: 4.6rem;
        min-width: 260px;
    }
}