.c4-analysis-app {
    --c4-p1: #1769d1;
    --c4-p2: #d32f2f;
    --c4-board: #d9dde2;
    --c4-board-edge: #a9b0b8;
    --c4-hole: #f7f8fa;
    --c4-border: #d7dce1;
    --c4-text: #20252b;
    max-width: 544px;
    margin: 1.5rem auto;
    color: var(--c4-text);
    font-family: system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
}

.c4-toolbar {
    display: flex;
    gap: 12px;
    align-items: center;
    justify-content: space-between;
    flex-wrap: wrap;
    margin-bottom: 10px;
}

.c4-turn {
    font-size: 1.15rem;
    font-weight: 800;
}

.c4-actions {
    display: flex;
    gap: 8px;
    flex-wrap: wrap;
}

.c4-actions button,
.c4-eval {
    border: 1px solid var(--c4-border);
    background: #fff;
    border-radius: 8px;
    cursor: pointer;
}

.c4-actions button {
    padding: 8px 12px;
}

.c4-actions button:disabled,
.c4-eval:disabled {
    cursor: default;
    opacity: .55;
}

.c4-cancel[hidden] {
    display: none !important;
}

.c4-status {
    box-sizing: border-box;
    min-height: 42px;
    padding: 9px 12px;
    margin-bottom: 10px;
    border: 1px solid var(--c4-border);
    border-radius: 8px;
    background: #fff;
    font-weight: 700;
}

.c4-loading { opacity: .76; }
.c4-ok { border-color: #8aa7bf; }
.c4-warning { border-color: #c9a64b; }
.c4-error { border-color: #b84c4c; }

.c4-scroll {
    overflow-x: auto;
    padding-bottom: 4px;
}

.c4-grid {
    min-width: 0;
    width: 100%;
}

.c4-evals,
.c4-columns,
.c4-board {
    display: grid;
    grid-template-columns: repeat(7, 1fr);
}

.c4-evals {
    gap: 3px;
    margin-bottom: 4px;
}

.c4-eval {
    min-height: 30px;
    padding: 2px 1px;
    font-weight: 800;
    line-height: 1.05;
}

.c4-eval-title,
.c4-eval-result {
    display: block;
}

.c4-eval-title {
    margin-bottom: 1px;
    color: var(--c4-text);
    font-size: 9px;
    font-weight: 700;
}

.c4-eval-result {
    font-size: clamp(14px, 2vw, 18px);
    font-weight: 900;
    line-height: 1;
}

.c4-eval.c4-best {
    outline: 3px solid #e0ab22;
    outline-offset: -2px;
}

.c4-eval.c4-best .c4-eval-title::after {
    content: " ★";
}

.c4-board {
    gap: 4px;
    padding: 6px;
    background: var(--c4-board);
    border: 2px solid var(--c4-board-edge);
    border-radius: 12px;
    box-shadow: 0 2px 7px rgba(0,0,0,.10);
}

.c4-cell {
    position: relative;
    aspect-ratio: 1 / 1;
    padding: 0;
    border: 1px solid rgba(65, 72, 80, .20);
    border-radius: 50%;
    background: var(--c4-hole);
    cursor: pointer;
    box-shadow: inset 0 2px 5px rgba(0,0,0,.16);
}

.c4-cell.c4-p1,
.c4-cell.c4-p2 {
    border-color: rgba(0,0,0,.25);
    box-shadow:
        inset 0 2px 5px rgba(255,255,255,.22),
        0 0 0 1px rgba(0,0,0,.12);
}

.c4-cell.c4-p1 { background: var(--c4-p1); }
.c4-cell.c4-p2 { background: var(--c4-p2); }

.c4-columns {
    padding: 4px 10px 0;
}

.c4-column-number {
    text-align: center;
    font-size: 12px;
    font-weight: 700;
}

.c4-p1-text { color: var(--c4-p1) !important; }
.c4-p2-text { color: var(--c4-p2) !important; }

.c4-history,
.c4-note {
    margin-top: 9px;
    font-size: .9rem;
}

.c4-note {
    color: #59636e;
}

.c4-fallback-note {
    margin-top: 4px;
    font-size: .84rem;
    color: #69737e;
}

@media (max-width: 620px) {
    .c4-analysis-app {
        margin-left: -4px;
        margin-right: -4px;
    }
}


.c4-standalone-page {
    margin: 0;
    background: #fff;
}

.c4-page-main {
    box-sizing: border-box;
    width: 100%;
    padding: 12px;
}

@media (max-width: 520px) {
    .c4-page-main {
        padding: 7px;
    }

    .c4-analysis-app {
        margin-top: .75rem;
        margin-bottom: .75rem;
    }

    .c4-board {
        gap: 4px;
        padding: 6px;
    }

    .c4-actions {
        gap: 5px;
    }

    .c4-actions button {
        padding: 6px 8px;
        font-size: .82rem;
    }

    .c4-status {
        min-height: 38px;
        padding: 7px 9px;
        font-size: .9rem;
    }

    .c4-eval {
        min-height: 34px;
        padding: 1px;
    }

    .c4-eval-title {
        font-size: 8px;
    }

    .c4-eval-result {
        font-size: clamp(13px, 3.4vw, 14px);
    }
}