/* ===== Shared styles ===== */
* {
    box-sizing: border-box;
    margin: 0;
    padding: 0;
}

body {
    font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
    background: #1a1a2e;
    color: #e0e0e0;
    min-height: 100vh;
    padding: 20px;
}

h1 {
    text-align: center;
    margin-bottom: 20px;
    color: #e0e0e0;
    font-size: 1.8em;
}

h2 {
    margin-bottom: 10px;
    color: #c0c0c0;
    font-size: 1.2em;
}

button {
    background: #3a3a5c;
    color: #e0e0e0;
    border: 1px solid #555;
    padding: 8px 16px;
    border-radius: 4px;
    cursor: pointer;
    font-size: 14px;
    transition: background 0.2s;
}

button:hover {
    background: #4a4a7c;
}

input[type="number"] {
    width: 48px;
    height: 32px;
    text-align: center;
    background: #2a2a4a;
    color: #e0e0e0;
    border: 1px solid #555;
    border-radius: 3px;
    font-size: 14px;
}

input[type="text"], textarea {
    background: #2a2a4a;
    color: #e0e0e0;
    border: 1px solid #555;
    border-radius: 3px;
    padding: 8px;
    font-size: 14px;
}

/* ===== Board grid ===== */
.board-container {
    display: inline-block;
}

.board-table {
    border-collapse: collapse;
}

.board-table td {
    width: 40px;
    height: 40px;
    text-align: center;
    vertical-align: middle;
}

.board-cell {
    background: #3a3a3a;
    border: 1px solid #888;
    cursor: pointer;
    transition: background 0.15s;
}

.board-cell.blocked {
    background: #1a1a1a;
    cursor: pointer;
}

.board-cell.filled {
    background: lightgreen;
    border: 1px solid #888;
}

/* ===== Constraint labels ===== */
.constraint-label {
    font-size: 14px;
    font-weight: bold;
    color: #ccc;
    padding: 2px 6px;
    min-width: 40px;
    text-align: center;
}

.constraint-label.over {
    color: #ff4444;
}

/* ===== Piece designer grid (3x3) ===== */
.piece-designer-grid {
    display: inline-grid;
    grid-template-columns: repeat(3, 36px);
    grid-template-rows: repeat(3, 36px);
    gap: 2px;
    margin: 10px 0;
}

.piece-designer-cell {
    width: 36px;
    height: 36px;
    background: #3a3a3a;
    border: 1px solid #888;
    cursor: pointer;
    transition: background 0.15s;
}

.piece-designer-cell.active {
    background: lightgreen;
}

/* ===== Piece inventory ===== */
.inventory {
    display: flex;
    flex-wrap: wrap;
    gap: 12px;
    padding: 10px;
    min-height: 60px;
    background: #222244;
    border: 1px solid #444;
    border-radius: 6px;
}

.inventory-piece {
    display: inline-grid;
    grid-template-columns: repeat(3, 24px);
    grid-template-rows: repeat(3, 24px);
    gap: 1px;
    padding: 4px;
    background: #2a2a4a;
    border: 1px solid #555;
    border-radius: 4px;
    cursor: grab;
    position: relative;
}

.inventory-piece:hover {
    border-color: #88f;
}

.inventory-piece-cell {
    width: 24px;
    height: 24px;
    background: #3a3a3a;
    border: 1px solid #555;
}

.inventory-piece-cell.active {
    background: lightgreen;
}

.delete-piece-btn {
    position: absolute;
    top: -8px;
    right: -8px;
    width: 20px;
    height: 20px;
    background: #cc3333;
    color: white;
    border: none;
    border-radius: 50%;
    font-size: 12px;
    line-height: 20px;
    text-align: center;
    cursor: pointer;
    padding: 0;
    display: flex;
    align-items: center;
    justify-content: center;
}

.delete-piece-btn:hover {
    background: #ff4444;
}

/* ===== Drag ghost ===== */
.drag-ghost {
    position: fixed;
    pointer-events: none;
    z-index: 9999;
    display: inline-grid;
    grid-template-columns: repeat(3, 36px);
    grid-template-rows: repeat(3, 36px);
    gap: 1px;
    opacity: 0.85;
}

.drag-ghost-cell {
    width: 36px;
    height: 36px;
}

.drag-ghost-cell.active {
    background: lightgreen;
    border: 1px solid #6a6;
    border-radius: 2px;
}

/* ===== Layout helpers ===== */
.page-layout {
    display: flex;
    gap: 40px;
    justify-content: center;
    align-items: flex-start;
    flex-wrap: wrap;
}

.panel {
    background: #16213e;
    border: 1px solid #333;
    border-radius: 8px;
    padding: 20px;
}

.section {
    margin-bottom: 20px;
}

.nav-link {
    display: inline-block;
    margin-bottom: 16px;
    color: #88aaff;
    text-decoration: none;
}

.nav-link:hover {
    text-decoration: underline;
}

/* ===== Play page specific ===== */
.play-inventory {
    max-width: 300px;
    min-width: 200px;
}

.highlight-valid {
    outline: 2px solid #4f4;
    outline-offset: -1px;
}

.highlight-invalid {
    outline: 2px solid #f44;
    outline-offset: -1px;
}