/* === Base / Reset === */
*, *::before, *::after {
    box-sizing: border-box;
}

:root {
    --color-bg: #f5f6f8;
    --color-surface: #ffffff;
    --color-border: #dfe3e8;
    --color-border-strong: #c4cdd5;
    --color-text: #1a1a2e;
    --color-text-muted: #637381;
    --color-primary: #3b5bdb;
    --color-primary-hover: #364fc7;
    --color-primary-text: #fff;
    --color-danger: #e03131;
    --color-danger-bg: #fff0f0;
    --color-success: #2b8a3e;
    --color-success-bg: #ebfbee;
    --color-info-bg: #e8f0fe;
    --color-info-border: #4a90d9;
    --radius-sm: 6px;
    --radius-md: 10px;
    --radius-lg: 14px;
    --shadow-sm: 0 1px 3px rgba(0,0,0,0.06), 0 1px 2px rgba(0,0,0,0.04);
    --shadow-md: 0 4px 12px rgba(0,0,0,0.08);
    --transition: 0.18s ease;
}

body {
    margin: 0;
    padding: 1.25rem;
    font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Inter, Roboto, Helvetica, Arial, sans-serif;
    font-size: 15px;
    line-height: 1.55;
    color: var(--color-text);
    background: var(--color-bg);
    -webkit-font-smoothing: antialiased;
}

h2, h3 {
    margin: 0 0 0.4rem;
    font-weight: 600;
    letter-spacing: -0.01em;
}

h3 {
    font-size: 0.95rem;
    text-transform: uppercase;
    letter-spacing: 0.04em;
    color: var(--color-text-muted);
}

/* === Buttons === */
button {
    cursor: pointer;
    padding: 0.45rem 1rem;
    border: 1px solid var(--color-border);
    border-radius: var(--radius-sm);
    background: var(--color-surface);
    font-size: 0.875rem;
    font-weight: 500;
    color: var(--color-text);
    transition: all var(--transition);
    white-space: nowrap;
}

button:hover {
    background: #f0f1f3;
    border-color: var(--color-border-strong);
    box-shadow: var(--shadow-sm);
}

button:active {
    transform: translateY(1px);
}

button:disabled {
    opacity: 0.45;
    cursor: not-allowed;
    transform: none;
    box-shadow: none;
}

button.btn-primary {
    background: var(--color-primary);
    border-color: var(--color-primary);
    color: var(--color-primary-text);
}

button.btn-primary:hover {
    background: var(--color-primary-hover);
    border-color: var(--color-primary-hover);
}

/* === Inputs === */
input[type="text"],
input[type="number"] {
    padding: 0.45rem 0.65rem;
    border: 1px solid var(--color-border);
    border-radius: var(--radius-sm);
    font-size: 0.9rem;
    background: var(--color-surface);
    color: var(--color-text);
    transition: border-color var(--transition), box-shadow var(--transition);
}

input[type="text"]:focus,
input[type="number"]:focus {
    outline: none;
    border-color: var(--color-primary);
    box-shadow: 0 0 0 3px rgba(59, 91, 219, 0.12);
}

label {
    display: flex;
    align-items: center;
    gap: 0.5rem;
    margin: 0.35rem 0;
    font-size: 0.875rem;
    color: var(--color-text-muted);
    cursor: pointer;
}

label input[type="checkbox"] {
    accent-color: var(--color-primary);
    width: 1rem;
    height: 1rem;
}

/* === Workflow Container (mobile-first: single column) === */
.workflow-container {
    display: flex;
    flex-direction: column;
    gap: 1.25rem;
    max-width: 1200px;
    margin: 0 auto;
}

/* === Controls Section === */
.controls-section {
    display: flex;
    flex-direction: column;
    gap: 0.75rem;
}

/* === Word List === */
.word-list {
    background: var(--color-surface);
    border: 1px solid var(--color-border);
    border-radius: var(--radius-md);
    padding: 0.85rem;
    box-shadow: var(--shadow-sm);
}

.word-list h3 {
    margin-bottom: 0.5rem;
}

/* Add-word row */
.word-list > div:first-of-type {
    display: flex;
    gap: 0.4rem;
    margin-bottom: 0.6rem;
}

.word-list > div:first-of-type input[type="text"] {
    flex: 1;
    min-width: 0;
}

/* === Word Item (draggable) === */
.word-item {
    display: flex;
    align-items: center;
    gap: 0.5rem;
    padding: 0.4rem 0.6rem;
    margin: 0.3rem 0;
    border: 1px solid var(--color-border);
    border-radius: var(--radius-sm);
    background: var(--color-bg);
    cursor: grab;
    user-select: none;
    transition: box-shadow var(--transition), border-color var(--transition), background var(--transition);
    font-weight: 500;
    font-size: 0.9rem;
    letter-spacing: 0.03em;
}

.word-item:hover {
    border-color: var(--color-border-strong);
    box-shadow: var(--shadow-sm);
    background: var(--color-surface);
}

.word-item.dragging {
    opacity: 0.35;
    box-shadow: none;
}

.word-drag-handle {
    color: var(--color-border-strong);
    font-size: 1.15rem;
    line-height: 1;
    cursor: grab;
    padding-right: 0.15rem;
}

.remove-word-btn {
    margin-left: auto;
    padding: 0.15rem 0.45rem;
    font-size: 0.75rem;
    color: var(--color-danger);
    border-color: transparent;
    background: transparent;
}

.remove-word-btn:hover {
    background: var(--color-danger-bg);
    border-color: var(--color-danger);
}

/* === Grid Controls === */
.grid-controls {
    background: var(--color-surface);
    border: 1px solid var(--color-border);
    border-radius: var(--radius-md);
    padding: 0.85rem;
    box-shadow: var(--shadow-sm);
}

.grid-controls h3 {
    margin-bottom: 0.4rem;
}

.grid-controls input[type="number"] {
    width: 4rem;
}

/* Generate button — prominent */
#start-generation-btn {
    background: var(--color-primary);
    border-color: var(--color-primary);
    color: var(--color-primary-text);
    padding: 0.6rem 1.4rem;
    font-size: 0.95rem;
    font-weight: 600;
    border-radius: var(--radius-sm);
    width: 100%;
}

#start-generation-btn:hover:not(:disabled) {
    background: var(--color-primary-hover);
    border-color: var(--color-primary-hover);
    box-shadow: var(--shadow-md);
}

/* === Grids Section === */
.grids-section {
    display: flex;
    flex-direction: column;
    gap: 1rem;
}

/* === Grid Preview === */
.grid-preview-section {
    background: var(--color-surface);
    border: 1px solid var(--color-border);
    border-radius: var(--radius-md);
    padding: 1rem;
    box-shadow: var(--shadow-sm);
}

.grid-preview-section h3 {
    margin-bottom: 0.6rem;
}

/* Mode toggle buttons */
.grid-preview-section > div:nth-of-type(2) {
    display: flex;
    gap: 0.5rem;
    margin-top: 0.75rem;
}

#select-crossword-btn,
#select-wordsearch-btn {
    flex: 1;
    padding: 0.45rem 0.8rem;
    font-weight: 600;
    border-radius: var(--radius-sm);
}

/* === Word Grid (CSS Grid) === */
.word-grid {
    display: grid;
    gap: 0;
    border: 2px solid var(--color-text);
    border-radius: 3px;
    width: fit-content;
    max-width: 100%;
    overflow: hidden;
}

/* === Grid Cell === */
.grid-cell {
    display: flex;
    align-items: center;
    justify-content: center;
    aspect-ratio: 1;
    min-width: 1.6rem;
    border: 1px solid #c8ccd0;
    font-family: "SF Mono", "Fira Code", "Cascadia Code", "Courier New", monospace;
    font-size: 0.95rem;
    font-weight: 700;
    text-transform: uppercase;
    background: var(--color-surface);
    color: var(--color-text);
}

.grid-cell.empty {
    background: var(--color-text);
}

/* === Candidate Thumbnails === */
.candidate-thumbnail {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    width: 3.2rem;
    height: 3.2rem;
    margin: 0.25rem;
    border: 2px solid var(--color-border);
    border-radius: var(--radius-sm);
    background: var(--color-bg);
    cursor: pointer;
    transition: all var(--transition);
    font-size: 0.75rem;
    font-weight: 600;
    color: var(--color-text-muted);
}

.candidate-thumbnail:hover {
    border-color: var(--color-primary);
    background: var(--color-surface);
    box-shadow: var(--shadow-sm);
    color: var(--color-primary);
}

/* === Used / Unused Words === */
.candidate-used-words,
.candidate-unused-words {
    font-size: 0.8rem;
    padding: 0.35rem 0.6rem;
    border-radius: var(--radius-sm);
    margin: 0.35rem 0;
}

.candidate-used-words {
    color: var(--color-success);
    background: var(--color-success-bg);
}

.candidate-unused-words {
    color: var(--color-danger);
    background: var(--color-danger-bg);
}

/* === Message Area === */
.message-area {
    padding: 0.6rem 0.85rem;
    margin-top: 0.5rem;
    border-left: 3px solid var(--color-info-border);
    background: var(--color-info-bg);
    border-radius: 0 var(--radius-sm) var(--radius-sm) 0;
    font-size: 0.85rem;
    line-height: 1.6;
    color: var(--color-text);
}

/* === Linkset (footer navigation) === */
linkset {
    display: flex;
    gap: 1rem;
    justify-content: center;
    padding: 1.5rem 0 0.75rem;
    margin-top: 2rem;
    border-top: 1px solid var(--color-border);
    font-size: 0.8rem;
}

linkset a {
    color: var(--color-text-muted);
    text-decoration: none;
    transition: color var(--transition);
}

linkset a:hover {
    color: var(--color-primary);
}

/* === Landscape Layout (two-column) === */
.workflow-container.landscape-layout {
    display: grid;
    grid-template-columns: 1fr 22rem;
    gap: 1.5rem;
    align-items: start;
}

.workflow-container.landscape-layout .grids-section {
    order: 0;
}

.workflow-container.landscape-layout .controls-section {
    order: 1;
    position: sticky;
    top: 1rem;
}

/* === Print Styling === */
@media print {
    body {
        padding: 0;
        background: #fff;
    }

    body.final_grid_only * {
        display: none !important;
    }

    body.final_grid_only #output,
    body.final_grid_only .workflow-container,
    body.final_grid_only .grids-section,
    body.final_grid_only .grid-preview-section,
    body.final_grid_only #focused-grid-container,
    body.final_grid_only .word-grid,
    body.final_grid_only .grid-cell {
        display: flex !important;
    }

    body.final_grid_only .word-grid {
        display: grid !important;
        width: 100% !important;
        max-width: 100% !important;
        border-color: #000;
    }

    body.final_grid_only .grid-cell {
        display: flex !important;
        border-color: #000;
        -webkit-print-color-adjust: exact;
        print-color-adjust: exact;
    }

    body.final_grid_only .grid-cell.empty {
        background: #000 !important;
    }

    body.final_grid_only .word-list,
    body.final_grid_only .grid-controls,
    body.final_grid_only #start-generation-btn,
    body.final_grid_only .candidate-thumbnail,
    body.final_grid_only .controls-section,
    body.final_grid_only .message-area,
    body.final_grid_only .candidate-used-words,
    body.final_grid_only .candidate-unused-words,
    body.final_grid_only nav,
    body.final_grid_only linkset {
        display: none !important;
    }
}