/* ============================================
   T-Shirt Quilt Planner — Stylesheet
   ============================================ */

/* --- Design Tokens --- */
:root {
    --bg-primary: #0f0f1a;
    --bg-secondary: #1a1a2e;
    --bg-card: rgba(255, 255, 255, 0.04);
    --bg-card-hover: rgba(255, 255, 255, 0.07);
    --border-subtle: rgba(255, 255, 255, 0.08);
    --border-focus: rgba(233, 69, 96, 0.5);

    --accent-coral: #e94560;
    --accent-amber: #f5a623;
    --accent-teal: #2dd4bf;
    --accent-violet: #8b5cf6;

    --text-primary: #f0f0f5;
    --text-secondary: #9ca3af;
    --text-muted: #6b7280;

    --radius-sm: 6px;
    --radius-md: 12px;
    --radius-lg: 18px;

    --shadow-card: 0 4px 24px rgba(0, 0, 0, 0.3);
    --shadow-glow: 0 0 30px rgba(233, 69, 96, 0.15);

    --transition: 0.25s cubic-bezier(0.4, 0, 0.2, 1);
    --font: 'Outfit', system-ui, sans-serif;
}

/* --- Reset & Base --- */
*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }

html {
    font-size: 15px;
    scroll-behavior: smooth;
}

body {
    font-family: var(--font);
    background: var(--bg-primary);
    color: var(--text-primary);
    min-height: 100vh;
    line-height: 1.6;
    -webkit-font-smoothing: antialiased;
}

/* Subtle grid background */
body::before {
    content: '';
    position: fixed;
    inset: 0;
    background-image:
        radial-gradient(circle at 20% 30%, rgba(233, 69, 96, 0.06) 0%, transparent 50%),
        radial-gradient(circle at 80% 70%, rgba(139, 92, 246, 0.06) 0%, transparent 50%);
    pointer-events: none;
    z-index: 0;
}

.app {
    position: relative;
    z-index: 1;
    max-width: 1400px;
    margin: 0 auto;
    padding: 0 1.5rem 2rem;
}

/* --- Header --- */
.app-header {
    padding: 2rem 0 1.5rem;
    text-align: center;
}

.header-content {
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 1rem;
}

.logo-icon {
    font-size: 1.1rem;
    line-height: 1.1;
    letter-spacing: 2px;
    color: var(--accent-coral);
    opacity: 0.9;
    user-select: none;
}

.app-header h1 {
    font-size: 2rem;
    font-weight: 700;
    background: linear-gradient(135deg, var(--accent-coral), var(--accent-amber));
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.subtitle {
    color: var(--text-secondary);
    font-weight: 300;
    font-size: 0.95rem;
    margin-top: 0.1rem;
}

/* --- Layout --- */
.main-grid {
    display: grid;
    grid-template-columns: 420px 1fr;
    gap: 1.5rem;
    align-items: start;
}

.input-column {
    display: flex;
    flex-direction: column;
    gap: 1.25rem;
}

.output-column {
    position: sticky;
    top: 1.5rem;
}

/* --- Cards --- */
.card {
    background: var(--bg-card);
    border: 1px solid var(--border-subtle);
    border-radius: var(--radius-lg);
    padding: 1.5rem;
    backdrop-filter: blur(12px);
    -webkit-backdrop-filter: blur(12px);
    box-shadow: var(--shadow-card);
    transition: border-color var(--transition);
    animation: fadeInUp 0.4s ease-out both;
}

.card:hover {
    border-color: rgba(255, 255, 255, 0.12);
}

.card h2 {
    font-size: 1.05rem;
    font-weight: 600;
    margin-bottom: 1rem;
    display: flex;
    align-items: center;
    gap: 0.5rem;
}

.card-icon {
    font-size: 1.1rem;
}

.card-header-row {
    display: flex;
    align-items: center;
    justify-content: space-between;
    margin-bottom: 1rem;
}

.card-header-row h2 {
    margin-bottom: 0;
}

.card-output {
    min-height: 400px;
}

/* --- Forms --- */
.form-grid {
    display: grid;
    grid-template-columns: 1fr 1fr 1fr;
    gap: 0.75rem;
    margin-bottom: 1rem;
}

.form-group {
    display: flex;
    flex-direction: column;
    gap: 0.3rem;
}

.form-group label {
    font-size: 0.75rem;
    font-weight: 500;
    color: var(--text-secondary);
    text-transform: uppercase;
    letter-spacing: 0.04em;
}

.form-group input[type="number"],
.form-group input[type="text"] {
    background: rgba(255, 255, 255, 0.06);
    border: 1px solid var(--border-subtle);
    border-radius: var(--radius-sm);
    padding: 0.55rem 0.7rem;
    color: var(--text-primary);
    font-family: var(--font);
    font-size: 0.9rem;
    transition: border-color var(--transition), box-shadow var(--transition);
    width: 100%;
}

.form-group input:focus {
    outline: none;
    border-color: var(--accent-coral);
    box-shadow: 0 0 0 3px rgba(233, 69, 96, 0.15);
}

.form-group input[type="color"] {
    width: 100%;
    height: 38px;
    border: 1px solid var(--border-subtle);
    border-radius: var(--radius-sm);
    background: transparent;
    cursor: pointer;
    padding: 2px;
}

.form-row-inline {
    display: grid;
    grid-template-columns: 1fr auto;
    gap: 0.75rem;
    margin-bottom: 0.75rem;
}

.form-row-inline.four-col {
    grid-template-columns: 1fr 1fr 1fr 1fr;
    margin-bottom: 1rem;
}

.fg-name { min-width: 0; }
.fg-color { width: 60px; }

/* --- Checkboxes --- */
.checkbox-group {
    display: flex;
    flex-direction: column;
    gap: 0.6rem;
}

.checkbox-label {
    display: flex;
    align-items: center;
    gap: 0.6rem;
    cursor: pointer;
    font-size: 0.88rem;
    color: var(--text-secondary);
    transition: color var(--transition);
    user-select: none;
}

.checkbox-label:hover { color: var(--text-primary); }

.checkbox-label input[type="checkbox"] {
    display: none;
}

.checkbox-custom {
    width: 18px;
    height: 18px;
    border: 2px solid var(--border-subtle);
    border-radius: 4px;
    position: relative;
    transition: all var(--transition);
    flex-shrink: 0;
}

.checkbox-label input:checked + .checkbox-custom {
    background: var(--accent-coral);
    border-color: var(--accent-coral);
}

.checkbox-label input:checked + .checkbox-custom::after {
    content: '✓';
    position: absolute;
    top: 50%;
    left: 50%;
    transform: translate(-50%, -50%);
    font-size: 11px;
    color: #fff;
    font-weight: 700;
}

/* --- Buttons --- */
.btn {
    font-family: var(--font);
    font-weight: 600;
    border: none;
    border-radius: var(--radius-sm);
    cursor: pointer;
    transition: all var(--transition);
    font-size: 0.88rem;
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: 0.4rem;
}

.btn-primary {
    background: var(--accent-coral);
    color: #fff;
    padding: 0.6rem 1.2rem;
    width: 100%;
}

.btn-primary:hover { background: #d63a54; transform: translateY(-1px); }

.btn-accent {
    background: linear-gradient(135deg, var(--accent-coral), var(--accent-amber));
    color: #fff;
    padding: 0.6rem 1.4rem;
}

.btn-accent:hover { transform: translateY(-1px); box-shadow: var(--shadow-glow); }
.btn-accent:disabled, .btn-primary:disabled {
    opacity: 0.4;
    cursor: not-allowed;
    transform: none;
    box-shadow: none;
}

.btn-generate {
    width: 100%;
    padding: 0.75rem;
    font-size: 1rem;
    margin-top: 1rem;
}

.btn-small {
    padding: 0.35rem 0.8rem;
    font-size: 0.78rem;
}

.btn-danger {
    background: rgba(239, 68, 68, 0.15);
    color: #ef4444;
    border: 1px solid rgba(239, 68, 68, 0.2);
}

.btn-danger:hover { background: rgba(239, 68, 68, 0.25); }

/* --- Divider --- */
.divider {
    display: flex;
    align-items: center;
    gap: 0.75rem;
    margin: 1.2rem 0;
    color: var(--text-muted);
    font-size: 0.8rem;
}

.divider::before, .divider::after {
    content: '';
    flex: 1;
    height: 1px;
    background: var(--border-subtle);
}

/* --- CSV Upload --- */
.csv-upload {
    border: 2px dashed var(--border-subtle);
    border-radius: var(--radius-md);
    padding: 1.5rem;
    text-align: center;
    cursor: pointer;
    transition: all var(--transition);
}

.csv-upload:hover, .csv-upload.drag-over {
    border-color: var(--accent-coral);
    background: rgba(233, 69, 96, 0.05);
}

.upload-icon { font-size: 1.8rem; margin-bottom: 0.4rem; }
.csv-upload p { font-size: 0.88rem; color: var(--text-secondary); }
.upload-sub { font-size: 0.78rem !important; color: var(--text-muted) !important; margin-top: 0.2rem; }

.sample-link {
    display: inline-block;
    margin-top: 0.75rem;
    font-size: 0.8rem;
    color: var(--accent-teal);
    text-decoration: none;
    transition: color var(--transition);
}

.sample-link:hover { color: #5eead4; text-decoration: underline; }

/* --- Table --- */
.table-wrapper {
    overflow-x: auto;
    max-height: 350px;
    overflow-y: auto;
}

.table-wrapper::-webkit-scrollbar { width: 5px; height: 5px; }
.table-wrapper::-webkit-scrollbar-track { background: transparent; }
.table-wrapper::-webkit-scrollbar-thumb { background: var(--border-subtle); border-radius: 10px; }

#block-table {
    width: 100%;
    border-collapse: collapse;
    font-size: 0.82rem;
}

#block-table th {
    text-align: left;
    font-size: 0.7rem;
    font-weight: 600;
    text-transform: uppercase;
    letter-spacing: 0.05em;
    color: var(--text-muted);
    padding: 0.5rem 0.4rem;
    border-bottom: 1px solid var(--border-subtle);
    position: sticky;
    top: 0;
    background: var(--bg-secondary);
    z-index: 1;
}

#block-table td {
    padding: 0.45rem 0.4rem;
    border-bottom: 1px solid rgba(255, 255, 255, 0.03);
    vertical-align: middle;
    white-space: nowrap;
}

#block-table tbody tr {
    transition: background var(--transition);
    animation: fadeInUp 0.25s ease-out both;
}

#block-table tbody tr:hover {
    background: rgba(255, 255, 255, 0.03);
}

.th-color { width: 30px; }
.th-actions { width: 32px; }

.color-swatch {
    width: 22px;
    height: 22px;
    border-radius: 4px;
    border: 1px solid rgba(255, 255, 255, 0.1);
    display: inline-block;
}

.btn-delete-row {
    background: none;
    border: none;
    color: var(--text-muted);
    cursor: pointer;
    font-size: 1rem;
    padding: 0.2rem;
    border-radius: 4px;
    transition: all var(--transition);
    line-height: 1;
}

.btn-delete-row:hover {
    color: #ef4444;
    background: rgba(239, 68, 68, 0.1);
}

.block-count {
    font-weight: 400;
    color: var(--text-muted);
    font-size: 0.85rem;
}

/* --- Empty State --- */
.empty-state {
    text-align: center;
    padding: 2rem 1rem;
    color: var(--text-muted);
}

.empty-state p { font-size: 0.88rem; }
.empty-sub { font-size: 0.78rem; margin-top: 0.3rem; }

/* --- Output --- */
.output-placeholder {
    text-align: center;
    padding: 4rem 2rem;
    color: var(--text-muted);
}

.placeholder-icon { font-size: 3rem; margin-bottom: 0.75rem; opacity: 0.5; }
.output-placeholder p { font-size: 0.95rem; }
.placeholder-sub { font-size: 0.82rem; margin-top: 0.3rem; }

/* Quilt Visual */
.quilt-container {
    position: relative;
    margin: 0 auto;
    border: 2px solid var(--border-subtle);
    border-radius: var(--radius-sm);
    overflow: hidden;
}

.quilt-sashing-bg {
    position: absolute;
    inset: 0;
    /* Crosshatch pattern */
    background:
        repeating-linear-gradient(
            45deg,
            transparent,
            transparent 3px,
            rgba(0, 0, 0, 0.7) 3px,
            rgba(0, 0, 0, 0.7) 3.5px
        ),
        repeating-linear-gradient(
            -45deg,
            transparent,
            transparent 3px,
            rgba(0, 0, 0, 0.7) 3px,
            rgba(0, 0, 0, 0.7) 3.5px
        ),
        #e8e8e8;
    z-index: 0;
}

.quilt-block {
    position: absolute;
    z-index: 1;
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    text-align: center;
    border-radius: 2px;
    transition: transform 0.2s ease, box-shadow 0.2s ease, z-index 0s;
    cursor: default;
    overflow: hidden;
    border: 1px solid rgba(0,0,0,0.15);
}

.quilt-block:hover {
    transform: scale(1.03);
    box-shadow: 0 4px 20px rgba(0, 0, 0, 0.4);
    z-index: 10;
}

.quilt-block-num {
    font-size: 2rem;
    font-weight: 700;
    line-height: 1;
    text-shadow: 0 2px 4px rgba(0,0,0,0.4);
    pointer-events: none;
    user-select: none;
}

.resize-handle {
    position: absolute;
    right: 0;
    bottom: 0;
    width: 14px;
    height: 14px;
    cursor: nwse-resize;
    background: linear-gradient(135deg, transparent 50%, rgba(255,255,255,0.3) 50%);
    border-bottom-right-radius: 2px;
    z-index: 10;
}

.rotate-handle {
    position: absolute;
    left: 4px;
    bottom: 4px;
    width: 20px;
    height: 20px;
    cursor: pointer;
    background: rgba(0,0,0,0.5);
    color: white;
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 12px;
    opacity: 0.6;
    transition: opacity 0.2s, transform 0.2s;
    z-index: 10;
}
.rotate-handle:hover {
    opacity: 1;
    transform: rotate(90deg);
}

.trash-zone {
    position: fixed;
    bottom: 2rem;
    left: 50%;
    transform: translateX(-50%) translateY(100px);
    background: rgba(239, 68, 68, 0.95);
    color: white;
    padding: 0.8rem 1.5rem;
    border-radius: 50px;
    font-weight: 600;
    font-size: 0.9rem;
    display: flex;
    align-items: center;
    gap: 0.5rem;
    opacity: 0;
    transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
    z-index: 1000;
    pointer-events: none;
    box-shadow: 0 4px 20px rgba(239, 68, 68, 0.4);
}

body.is-dragging-block .trash-zone {
    transform: translateX(-50%) translateY(0);
    opacity: 1;
}

/* Quilt Legend */
.quilt-legend {
    margin-top: 1.5rem;
    padding-top: 1rem;
    border-top: 1px solid var(--border-subtle);
}

.legend-list {
    display: flex;
    flex-direction: column;
    gap: 0.5rem;
}

.legend-item {
    display: flex;
    align-items: center;
    gap: 0.5rem;
    font-size: 0.85rem;
    color: var(--text-primary);
}

.legend-dims {
    color: var(--text-muted);
    font-size: 0.75rem;
    margin-left: auto;
}

.legend-swatch {
    width: 14px;
    height: 14px;
    border-radius: 3px;
    border: 1px solid rgba(255, 255, 255, 0.2);
    flex-shrink: 0;
}

/* Scale indicator */
.quilt-scale {
    text-align: center;
    font-size: 0.72rem;
    color: var(--text-muted);
    margin-top: 0.75rem;
}

/* Warnings */
.warnings {
    margin-top: 1rem;
}

.warning-item {
    background: rgba(245, 166, 35, 0.1);
    border: 1px solid rgba(245, 166, 35, 0.2);
    border-radius: var(--radius-sm);
    padding: 0.6rem 0.8rem;
    font-size: 0.8rem;
    color: var(--accent-amber);
    margin-bottom: 0.5rem;
    display: flex;
    align-items: flex-start;
    gap: 0.4rem;
}

.warning-item::before { content: '⚠️'; flex-shrink: 0; }

.quilt-block.drag-swap {
    outline: 3px solid var(--accent-coral);
    outline-offset: -3px;
    opacity: 0.9;
}
.quilt-block.drag-insert-before {
    box-shadow: -6px 0 0 var(--accent-teal);
    z-index: 20;
}
.quilt-block.drag-insert-after {
    box-shadow: 6px 0 0 var(--accent-teal);
    z-index: 20;
}

/* --- Stash Area --- */
.stash-container {
    margin-top: 2rem;
    padding-top: 1.5rem;
    border-top: 1px dashed var(--border-subtle);
}

.stash-container h3 {
    font-size: 1.1rem;
    color: var(--text-primary);
    margin-bottom: 0.25rem;
}

.stash-sub {
    font-size: 0.85rem;
    color: var(--text-secondary);
    margin-bottom: 1rem;
}

.stash-list {
    display: flex;
    flex-wrap: wrap;
    gap: 0.75rem;
}

.stash-block {
    background: rgba(255, 255, 255, 0.05);
    border: 1px solid var(--border-subtle);
    border-radius: var(--radius-sm);
    padding: 0.5rem 1rem;
    display: flex;
    align-items: center;
    gap: 0.75rem;
    font-size: 0.85rem;
    cursor: grab;
    transition: all var(--transition);
}

.stash-block:hover {
    background: rgba(255, 255, 255, 0.1);
    transform: translateY(-2px);
    box-shadow: 0 4px 12px rgba(0,0,0,0.3);
}

.stash-block:active {
    cursor: grabbing;
}

/* --- Footer --- */
.app-footer {
    text-align: center;
    padding: 2rem 0;
    color: var(--text-muted);
    font-size: 0.8rem;
}

/* --- Animations --- */
@keyframes fadeInUp {
    from { opacity: 0; transform: translateY(12px); }
    to   { opacity: 1; transform: translateY(0); }
}

/* --- Responsive --- */
@media (max-width: 900px) {
    .main-grid {
        grid-template-columns: 1fr;
    }

    .output-column {
        position: static;
    }

    .form-grid {
        grid-template-columns: 1fr 1fr;
    }
}

@media (max-width: 500px) {
    .form-row-inline.four-col {
        grid-template-columns: 1fr 1fr;
    }

    .header-content {
        flex-direction: column;
        gap: 0.3rem;
    }

    .app-header h1 { font-size: 1.5rem; }
}