*,
*::before,
*::after {
    box-sizing: border-box;
    margin: 0;
    padding: 0;
}

:root {
    --bg: #fafaf9;
    --card: #ffffff;
    --text: #1c1917;
    --text-muted: #78716c;
    --border: #e7e5e4;
    --primary: #2563eb;
    --primary-hover: #1d4ed8;
    --secondary: #f5f5f4;
    --secondary-hover: #e7e5e4;
    --ghost-hover: #f5f5f4;
    --error: #dc2626;
    --error-bg: #fef2f2;
    --success: #16a34a;
    --radius: 8px;
    --radius-lg: 12px;
    --shadow-sm: 0 1px 2px rgba(0, 0, 0, 0.05);
    --shadow: 0 1px 3px rgba(0, 0, 0, 0.08), 0 1px 2px rgba(0, 0, 0, 0.04);
}

body {
    font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, sans-serif;
    background: var(--bg);
    color: var(--text);
    line-height: 1.6;
    min-height: 100vh;
}

.container {
    max-width: 720px;
    margin: 0 auto;
    padding: 2.5rem 1.25rem;
}

/* Header */

header {
    text-align: center;
    margin-bottom: 2rem;
}

header h1 {
    font-size: 1.75rem;
    font-weight: 700;
    letter-spacing: -0.02em;
}

.subtitle {
    color: var(--text-muted);
    font-size: 0.95rem;
    margin-top: 0.35rem;
}

/* Cards */

.card {
    background: var(--card);
    border: 1px solid var(--border);
    border-radius: var(--radius-lg);
    padding: 1.5rem;
    margin-bottom: 1.25rem;
    box-shadow: var(--shadow-sm);
}

.card h2 {
    font-size: 1rem;
    font-weight: 600;
    margin-bottom: 1rem;
    color: var(--text);
}

/* Forms */

.form-row {
    display: flex;
    gap: 0.75rem;
}

.form-row .form-group {
    flex: 1;
}

.form-group {
    margin-bottom: 0.875rem;
}

.form-group label {
    display: block;
    font-size: 0.8rem;
    font-weight: 500;
    margin-bottom: 0.3rem;
    color: var(--text);
}

.form-group input,
.form-group select {
    width: 100%;
    padding: 0.5rem 0.625rem;
    border: 1px solid var(--border);
    border-radius: 6px;
    font-size: 0.875rem;
    background: var(--card);
    color: var(--text);
    transition: border-color 0.15s, box-shadow 0.15s;
}

.form-group input:focus,
.form-group select:focus {
    outline: none;
    border-color: var(--primary);
    box-shadow: 0 0 0 3px rgba(37, 99, 235, 0.1);
}

.form-group input::placeholder {
    color: #a8a29e;
}

.form-group small {
    display: block;
    color: var(--text-muted);
    font-size: 0.7rem;
    margin-top: 0.2rem;
}

/* Settings grid */

.settings-grid {
    display: grid;
    grid-template-columns: 1fr 1fr 1fr;
    gap: 0.75rem;
}

.settings-row {
    margin-bottom: 0.75rem;
}

.settings-row .form-group {
    margin-bottom: 0;
}

.settings-row .form-group label {
    display: block;
    font-size: 0.8rem;
    font-weight: 500;
    margin-bottom: 0.3rem;
    color: var(--text);
}

.settings-row .form-group input {
    width: 100%;
    padding: 0.5rem 0.625rem;
    border: 1px solid var(--border);
    border-radius: 6px;
    font-size: 0.875rem;
    background: var(--card);
    color: var(--text);
}

.settings-row .form-group small {
    display: block;
    color: var(--text-muted);
    font-size: 0.7rem;
    margin-top: 0.2rem;
}

/* Buttons */

.btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    padding: 0.5rem 1rem;
    border: none;
    border-radius: 6px;
    font-size: 0.875rem;
    font-weight: 500;
    cursor: pointer;
    transition: background 0.15s, transform 0.1s;
    text-decoration: none;
}

.btn:active:not(:disabled) {
    transform: scale(0.98);
}

.btn:disabled {
    opacity: 0.5;
    cursor: not-allowed;
}

.btn-primary {
    background: var(--primary);
    color: #fff;
}

.btn-primary:hover:not(:disabled) {
    background: var(--primary-hover);
}

.btn-secondary {
    background: var(--secondary);
    color: var(--text);
}

.btn-secondary:hover:not(:disabled) {
    background: var(--secondary-hover);
}

.btn-ghost {
    background: transparent;
    color: var(--text-muted);
    padding: 0.375rem 0.75rem;
    font-size: 0.8rem;
}

.btn-ghost:hover:not(:disabled) {
    background: var(--ghost-hover);
    color: var(--text);
}

.btn-large {
    width: 100%;
    padding: 0.625rem 1.25rem;
    font-size: 0.95rem;
    margin-top: 0.5rem;
}

/* Advanced toggle */

.advanced-toggle {
    margin-top: 0.25rem;
    margin-bottom: 0.5rem;
}

.advanced-toggle summary {
    font-size: 0.8rem;
    color: var(--text-muted);
    cursor: pointer;
    padding: 0.375rem 0;
    user-select: none;
    list-style: none;
}

.advanced-toggle summary::-webkit-details-marker {
    display: none;
}

.advanced-toggle summary::before {
    content: "\25B6";
    display: inline-block;
    font-size: 0.6rem;
    margin-right: 0.4rem;
    transition: transform 0.15s;
}

.advanced-toggle[open] summary::before {
    transform: rotate(90deg);
}

.advanced-toggle summary:hover {
    color: var(--text);
}

.advanced-toggle .settings-grid {
    margin-top: 0.75rem;
}

/* Status */

.status {
    font-size: 0.8rem;
    min-height: 1.2em;
    margin-top: 0.25rem;
}

.status.error {
    color: var(--error);
}

.status.success {
    color: var(--success);
}

/* Error banner */

.error {
    background: var(--error-bg);
    color: var(--error);
    padding: 0.875rem 1.25rem;
    border-radius: var(--radius);
    border: 1px solid #fecaca;
    margin-bottom: 1.25rem;
    font-size: 0.875rem;
}

/* Loading */

.loading {
    text-align: center;
    padding: 3rem;
}

.spinner {
    width: 28px;
    height: 28px;
    border: 3px solid var(--border);
    border-top-color: var(--primary);
    border-radius: 50%;
    animation: spin 0.7s linear infinite;
    margin: 0 auto 0.75rem;
}

@keyframes spin {
    to { transform: rotate(360deg); }
}

.loading p {
    color: var(--text-muted);
    font-size: 0.875rem;
}

/* Pattern section */

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

.pattern-header h2 {
    margin-bottom: 0;
}

.stats-panel {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: 0.5rem;
    margin-bottom: 1.25rem;
}

.stat-card {
    background: var(--bg);
    padding: 0.625rem 0.5rem;
    border-radius: var(--radius);
    text-align: center;
}

.stat-card .stat-value {
    font-size: 1.15rem;
    font-weight: 700;
    line-height: 1.2;
}

.stat-card .stat-label {
    font-size: 0.65rem;
    color: var(--text-muted);
    text-transform: uppercase;
    letter-spacing: 0.03em;
    margin-top: 0.15rem;
}

/* Pattern grid */

.pattern-scroll {
    overflow-x: auto;
    margin-bottom: 1rem;
    border: 1px solid var(--border);
    border-radius: var(--radius);
    background: var(--card);
    display: flex;
    justify-content: center;
}

.pattern-grid {
    display: flex;
    flex-direction: column;
    gap: 1px;
    width: 100%;
    padding: 0.5rem;
}

.pattern-row {
    width: 100%;
    height: 4px;
    border-radius: 1px;
    position: relative;
    cursor: crosshair;
}

.pattern-row[data-tooltip]::after {
    content: attr(data-tooltip);
    position: absolute;
    bottom: calc(100% + 6px);
    left: 50%;
    transform: translateX(-50%);
    background: var(--text);
    color: var(--card);
    padding: 0.2rem 0.45rem;
    border-radius: 4px;
    font-size: 0.65rem;
    white-space: nowrap;
    pointer-events: none;
    opacity: 0;
    transition: opacity 0.12s;
}

.pattern-row:hover[data-tooltip]::after {
    opacity: 1;
}

/* Colour key */

.colour-key {
    margin-bottom: 1.5rem;
    padding: 0.75rem;
    background: var(--bg);
    border-radius: var(--radius);
}

.colour-key-bar {
    display: flex;
    height: 20px;
    border-radius: 4px;
}

.colour-key-block {
    flex: 1;
    position: relative;
}

.colour-key-block[data-tooltip]::after {
    content: attr(data-tooltip);
    position: absolute;
    bottom: calc(100% + 6px);
    left: 50%;
    transform: translateX(-50%);
    background: var(--text);
    color: var(--card);
    padding: 0.2rem 0.45rem;
    border-radius: 4px;
    font-size: 0.65rem;
    white-space: nowrap;
    pointer-events: none;
    opacity: 0;
    transition: opacity 0.12s;
    z-index: 2;
}

.colour-key-block:hover[data-tooltip]::after {
    opacity: 1;
}

.colour-key-labels {
    display: flex;
    justify-content: space-between;
    margin-top: 0.3rem;
    font-size: 0.7rem;
    color: var(--text-muted);
}

.colour-key-list {
    display: flex;
    flex-wrap: wrap;
    gap: 0.3rem 0.75rem;
    margin-top: 0.5rem;
    padding-top: 0.5rem;
    border-top: 1px solid var(--border);
}

.colour-key-item {
    display: flex;
    align-items: center;
    gap: 0.3rem;
    font-size: 0.7rem;
}

.colour-key-swatch {
    width: 10px;
    height: 10px;
    border-radius: 2px;
    flex-shrink: 0;
}

.colour-key-id {
    font-weight: 600;
    color: var(--text);
}

.colour-key-name {
    color: var(--text-muted);
}

.colour-key-range {
    color: var(--text-muted);
    font-size: 0.65rem;
}

/* Instructions */

.instructions-section h3 {
    font-size: 0.95rem;
    font-weight: 600;
    margin-bottom: 0.625rem;
}

.instructions {
    max-height: 300px;
    overflow-y: auto;
    border: 1px solid var(--border);
    border-radius: var(--radius);
    padding: 0.625rem;
    font-family: "SF Mono", "Fira Code", "Consolas", monospace;
    font-size: 0.7rem;
    line-height: 1.9;
    background: var(--card);
}

.instruction-line {
    display: flex;
    align-items: center;
    gap: 0.4rem;
}

.instruction-swatch {
    width: 10px;
    height: 10px;
    border-radius: 2px;
    flex-shrink: 0;
}

/* Search results dropdown */

.search-group {
    position: relative;
}

.search-results {
    position: absolute;
    top: 100%;
    left: 0;
    right: 0;
    background: var(--card);
    border: 1px solid var(--border);
    border-radius: 6px;
    box-shadow: var(--shadow);
    z-index: 10;
    max-height: 220px;
    overflow-y: auto;
}

.search-result-item {
    padding: 0.6rem 0.75rem;
    cursor: pointer;
    border-bottom: 1px solid var(--border);
    font-size: 0.85rem;
    line-height: 1.3;
}

.search-result-item:last-child {
    border-bottom: none;
}

.search-result-item:hover {
    background: var(--ghost-hover);
}

.search-result-name {
    font-weight: 500;
}

.search-result-meta {
    font-size: 0.7rem;
    color: var(--text-muted);
}

.search-no-results {
    padding: 0.6rem 0.75rem;
    font-size: 0.8rem;
    color: var(--text-muted);
}

/* Footer */

footer {
    text-align: center;
    margin-top: 2rem;
    padding-top: 1.5rem;
    border-top: 1px solid var(--border);
    color: var(--text-muted);
    font-size: 0.75rem;
}

footer p + p {
    margin-top: 0.25rem;
}

footer a {
    color: var(--primary);
    text-decoration: none;
}

footer a:hover {
    text-decoration: underline;
}

/* Responsive */

@media (max-width: 640px) {
    .container {
        padding: 1.5rem 1rem;
    }

    header h1 {
        font-size: 1.5rem;
    }

    .form-row {
        flex-direction: column;
        gap: 0;
    }

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

    .stats-panel {
        grid-template-columns: repeat(2, 1fr);
    }

    .pattern-header {
        flex-direction: column;
        gap: 0.75rem;
        align-items: flex-start;
    }

    .btn-large {
        margin-top: 0.75rem;
    }
}