/*
 * Design Rules
 *
 * Container Queries:
 *   - container-type: inline-size on parent = "local coordinate system"
 *   - Use cqi for all proportional dimensions (size, stroke, radius)
 *   - Similar-sized containers → identical-looking marks
 *
 * Data Attributes:
 *   - data-mark="X"|"O" everywhere (cells, panels, status)
 *   - Single selector [data-mark="X"] styles all instances
 *
 * CSS Cascade:
 *   - Equal specificity → source order wins
 *   - Overrides (like .status) must come after base rules (like [data-mark])
 *
 * Colors (HSL):
 *   - Accents: distinct hues (blue 203°, orange 16°)
 *   - Neutrals: single hue family (40-45°), vary saturation/lightness
 *
 * Geometric Marks:
 *   - No text content needed; shapes are purely CSS
 *   - ::before/::after with position: absolute draw shapes
 *   - Parent needs position: relative (unless already positioned)
 */

:root {
    /* Accents: blue and orange, complementary */
    --color-x: hsl(203, 100%, 45%);
    --color-o: hsl(16, 87%, 59%);

    /* Neutrals: sepia/gruvbox family (hue 40-45°, golden) */
    --color-bg: hsl(45, 35%, 85%);
    --color-surface: hsl(45, 40%, 94%);
    --color-border: hsl(30, 20%, 25%);
    --color-border-light: hsl(35, 15%, 40%);
    --color-text: hsl(30, 25%, 22%);
    --color-text-muted: hsl(35, 15%, 50%);
}

.controls {
    display: flex;
    gap: 20px;
    margin-bottom: 10px;
    font-family: inherit;
}

body {
    display: flex;
    flex-direction: column;
    align-items: center;
    padding: min(20px, 3vw);
    background: var(--color-bg);
    color: var(--color-text);
    font-family: system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, sans-serif;
    min-height: 100vh;
    margin: 0;
}

.turn-indicator {
    display: flex;
    justify-content: space-between;
    align-items: center;
    width: min(400px, 100%);
    margin-bottom: 10px;
    gap: 10px;
}

.final-status {
    flex: 1;
    text-align: center;
    font-size: 24px;
    font-weight: bold;
    min-height: 1.5em;
    color: var(--color-text);
}

@media (max-width: 360px) {
    .turn-indicator {
        flex-wrap: wrap;
        gap: 5px;
    }

    .final-status {
        order: -1;
        flex-basis: 100%;
    }
}

.player-panel {
    border-radius: 8px;
    background: var(--color-surface);
    transition: background 0.4s, box-shadow 0.4s;
    width: 48px;
    height: 48px;
    container-type: inline-size;
}

.player-panel[data-mark="X"][data-active] {
    background: var(--color-x);
    box-shadow: 0 2px 12px hsl(203, 100%, 45%, 0.4);
}
.player-panel[data-mark="X"][data-active]::before,
.player-panel[data-mark="X"][data-active]::after {
    background: #fff;
}

.player-panel[data-mark="O"][data-active] {
    background: var(--color-o);
    box-shadow: 0 2px 12px hsl(16, 87%, 59%, 0.4);
}
.player-panel[data-mark="O"][data-active]::before {
    border-color: #fff;
}

.board {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    width: min(400px, 100%);
    container-type: inline-size;
    background: var(--color-surface);
    border-radius: 12px;
    padding: 2%;
    box-shadow: 0 4px 24px hsl(40, 30%, 50%, 0.25);
}

.sub-board {
    position: relative;
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    border-top: 1.25cqi solid var(--color-border);
    border-left: 1.25cqi solid var(--color-border);
    padding: 5%;
    container-type: inline-size;
}

.sub-board[data-meta-row="0"] { border-top: none; }
.sub-board[data-meta-col="0"] { border-left: none; }

.cell {
    aspect-ratio: 1;
    min-width: 0;
    border-top: 1.5cqi solid var(--color-border-light);
    border-left: 1.5cqi solid var(--color-border-light);
    overflow: hidden;
    cursor: pointer;
    transition: background 0.3s;
    container-type: inline-size;
}

.cell:not([data-mark]):hover {
    background: hsl(45, 35%, 85%);
}

.cell[data-row="0"] { border-top: none; }
.cell[data-col="0"] { border-left: none; }

/* CSS shapes for marks */
[data-mark] {
    position: relative;
    display: flex;
    align-items: center;
    justify-content: center;
}

/* X mark: two crossed lines */
[data-mark="X"]::before,
[data-mark="X"]::after {
    content: "";
    position: absolute;
    width: 12cqi;
    height: 72cqi;
    background: var(--color-x);
    border-radius: 99cqi;
    transition: background 0.4s;
}
[data-mark="X"]::before { transform: rotate(45deg); }
[data-mark="X"]::after { transform: rotate(-45deg); }

/* O mark: ring */
[data-mark="O"]::before {
    content: "";
    position: absolute;
    width: 38cqi;
    height: 38cqi;
    border: 10cqi solid var(--color-o);
    border-radius: 50%;
    transition: border-color 0.4s;
}

/* Inactive panel marks use muted color */
.player-panel:not([data-active])[data-mark="X"]::before,
.player-panel:not([data-active])[data-mark="X"]::after {
    background: var(--color-text-muted);
}
.player-panel:not([data-active])[data-mark="O"]::before {
    border-color: var(--color-text-muted);
}

/* Status overlay (after [data-mark] so position:absolute wins) */
.status {
    position: absolute;
    inset: 0;
    background: hsl(45, 40%, 94%, 0.92);
    pointer-events: none;
    border-radius: 4px;
    opacity: 0;
    transition: opacity 0.4s;
    container-type: inline-size;
}

.status[data-resolved] {
    opacity: 1;
}

.status[data-constrained] {
    opacity: 1;
    background: hsl(40, 20%, 45%, 0.35);
}