/* CSS Grid Layout Analyzer - Styles */

/* CSS Variables */
:root {
    --color-primary: #6366f1;
    --color-primary-dark: #4f46e5;
    --color-primary-light: #818cf8;
    --color-secondary: #64748b;
    --color-success: #22c55e;
    --color-warning: #f59e0b;
    --color-error: #ef4444;
    --color-info: #3b82f6;

    --color-bg: #f8fafc;
    --color-bg-card: #ffffff;
    --color-bg-dark: #1e293b;
    --color-text: #1e293b;
    --color-text-muted: #64748b;
    --color-text-light: #f8fafc;
    --color-border: #e2e8f0;

    --shadow-sm: 0 1px 2px 0 rgb(0 0 0 / 0.05);
    --shadow-md: 0 4px 6px -1px rgb(0 0 0 / 0.1), 0 2px 4px -2px rgb(0 0 0 / 0.1);
    --shadow-lg: 0 10px 15px -3px rgb(0 0 0 / 0.1), 0 4px 6px -4px rgb(0 0 0 / 0.1);

    --radius-sm: 4px;
    --radius-md: 8px;
    --radius-lg: 12px;
    --radius-xl: 16px;

    --transition-fast: 150ms ease;
    --transition-normal: 250ms ease;

    --font-sans: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, Oxygen, Ubuntu, Cantarell, sans-serif;
    --font-mono: 'SF Mono', Monaco, 'Cascadia Code', 'Consolas', monospace;
}

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

html {
    font-size: 16px;
    scroll-behavior: smooth;
}

body {
    font-family: var(--font-sans);
    background-color: var(--color-bg);
    color: var(--color-text);
    line-height: 1.6;
    min-height: 100vh;
    display: flex;
    flex-direction: column;
}

/* Utility Classes */
.container {
    width: 100%;
    max-width: 1400px;
    margin: 0 auto;
    padding: 0 1rem;
}

.visually-hidden {
    position: absolute;
    width: 1px;
    height: 1px;
    padding: 0;
    margin: -1px;
    overflow: hidden;
    clip: rect(0, 0, 0, 0);
    white-space: nowrap;
    border: 0;
}

/* Header */
.header {
    background: linear-gradient(135deg, var(--color-primary) 0%, var(--color-primary-dark) 100%);
    color: var(--color-text-light);
    padding: 1.5rem 0;
    box-shadow: var(--shadow-lg);
}

.header-content {
    text-align: center;
}

.logo {
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 0.75rem;
    margin-bottom: 0.5rem;
}

.logo-img {
    width: 48px;
    height: 48px;
    border-radius: var(--radius-md);
}

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

.tagline {
    font-size: 1rem;
    opacity: 0.9;
}

/* Main Content */
.main {
    flex: 1;
    padding: 2rem 0;
}

.app-layout {
    display: grid;
    gap: 2rem;
    grid-template-columns: 1fr;
}

@media (min-width: 1024px) {
    .app-layout {
        grid-template-columns: 1fr 1.5fr;
    }
}

/* Sections */
.input-section,
.results-section {
    background: var(--color-bg-card);
    border-radius: var(--radius-xl);
    padding: 1.5rem;
    box-shadow: var(--shadow-md);
}

.input-section h2,
.results-section h2 {
    font-size: 1.25rem;
    font-weight: 600;
    margin-bottom: 1rem;
    color: var(--color-text);
}

/* Input Group */
.input-group {
    margin-bottom: 1rem;
}

.css-input {
    width: 100%;
    min-height: 300px;
    padding: 1rem;
    font-family: var(--font-mono);
    font-size: 0.875rem;
    line-height: 1.6;
    border: 2px solid var(--color-border);
    border-radius: var(--radius-md);
    resize: vertical;
    transition: border-color var(--transition-fast), box-shadow var(--transition-fast);
    background: var(--color-bg);
}

.css-input:focus {
    outline: none;
    border-color: var(--color-primary);
    box-shadow: 0 0 0 3px rgba(99, 102, 241, 0.2);
}

.css-input::placeholder {
    color: var(--color-text-muted);
    opacity: 0.7;
}

.help-text {
    font-size: 0.875rem;
    color: var(--color-text-muted);
    margin-top: 0.5rem;
}

/* Buttons */
.button-group {
    display: flex;
    gap: 0.75rem;
    flex-wrap: wrap;
}

.btn {
    display: inline-flex;
    align-items: center;
    gap: 0.5rem;
    padding: 0.75rem 1.25rem;
    font-size: 0.9375rem;
    font-weight: 500;
    border: none;
    border-radius: var(--radius-md);
    cursor: pointer;
    transition: all var(--transition-fast);
}

.btn:focus {
    outline: none;
    box-shadow: 0 0 0 3px rgba(99, 102, 241, 0.3);
}

.btn-icon {
    font-size: 1rem;
}

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

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

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

.btn-secondary:hover {
    background: #475569;
}

.btn-tertiary {
    background: transparent;
    color: var(--color-primary);
    border: 2px solid var(--color-primary);
}

.btn-tertiary:hover {
    background: var(--color-primary);
    color: white;
}

/* Tabs */
.tabs {
    display: flex;
    gap: 0.25rem;
    border-bottom: 2px solid var(--color-border);
    margin-bottom: 1rem;
    overflow-x: auto;
    -webkit-overflow-scrolling: touch;
}

.tab {
    display: inline-flex;
    align-items: center;
    gap: 0.5rem;
    padding: 0.75rem 1rem;
    font-size: 0.875rem;
    font-weight: 500;
    color: var(--color-text-muted);
    background: transparent;
    border: none;
    border-bottom: 2px solid transparent;
    margin-bottom: -2px;
    cursor: pointer;
    transition: all var(--transition-fast);
    white-space: nowrap;
}

.tab:hover {
    color: var(--color-primary);
}

.tab.active {
    color: var(--color-primary);
    border-bottom-color: var(--color-primary);
}

.tab:focus {
    outline: none;
    background: rgba(99, 102, 241, 0.1);
}

.tab-icon {
    font-size: 1rem;
}

.badge {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    min-width: 1.25rem;
    height: 1.25rem;
    padding: 0 0.375rem;
    font-size: 0.75rem;
    font-weight: 600;
    background: var(--color-error);
    color: white;
    border-radius: 10rem;
}

/* Tab Panels */
.tab-panel {
    display: none;
}

.tab-panel.active {
    display: block;
}

/* Visualization */
.visualization-container {
    min-height: 400px;
}

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

.visualization-header h3 {
    font-size: 1rem;
    font-weight: 600;
}

.visualization-controls {
    display: flex;
    align-items: center;
    gap: 0.5rem;
    font-size: 0.875rem;
}

.visualization-controls input[type="range"] {
    width: 100px;
    accent-color: var(--color-primary);
}

.grid-visualization {
    background: var(--color-bg);
    border: 2px dashed var(--color-border);
    border-radius: var(--radius-md);
    min-height: 300px;
    padding: 1rem;
    overflow: auto;
}

.placeholder {
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    height: 200px;
    color: var(--color-text-muted);
    text-align: center;
}

.placeholder-icon {
    font-size: 3rem;
    margin-bottom: 1rem;
    opacity: 0.5;
}

/* Grid Preview */
.grid-preview {
    display: grid;
    gap: 4px;
    background: #ddd;
    padding: 4px;
    border-radius: var(--radius-md);
    width: fit-content;
    min-width: 100%;
}

.grid-cell {
    background: var(--color-primary-light);
    border-radius: var(--radius-sm);
    padding: 0.75rem;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 0.75rem;
    font-weight: 600;
    color: white;
    min-height: 60px;
    position: relative;
    transition: transform var(--transition-fast), box-shadow var(--transition-fast);
}

.grid-cell:hover {
    transform: scale(1.02);
    box-shadow: var(--shadow-md);
    z-index: 1;
}

.grid-cell.overlap {
    background: var(--color-error);
    animation: pulse 2s infinite;
}

.grid-cell.empty {
    background: rgba(100, 116, 139, 0.2);
    border: 2px dashed var(--color-secondary);
}

@keyframes pulse {
    0%, 100% { opacity: 1; }
    50% { opacity: 0.7; }
}

/* Grid Info */
.grid-info {
    margin-top: 1.5rem;
    padding: 1rem;
    background: var(--color-bg);
    border-radius: var(--radius-md);
}

.grid-info h4 {
    font-size: 0.875rem;
    font-weight: 600;
    margin-bottom: 0.75rem;
    color: var(--color-text);
}

.grid-info dl {
    display: grid;
    grid-template-columns: auto 1fr;
    gap: 0.5rem 1rem;
    font-size: 0.875rem;
}

.grid-info dt {
    font-weight: 500;
    color: var(--color-text-muted);
}

.grid-info dd {
    font-family: var(--font-mono);
    color: var(--color-text);
}

/* Issues Container */
.issues-container,
.suggestions-container,
.accessibility-container {
    min-height: 200px;
}

/* Issue/Suggestion Cards */
.issue-card,
.suggestion-card,
.a11y-card {
    background: var(--color-bg);
    border-radius: var(--radius-md);
    padding: 1rem;
    margin-bottom: 0.75rem;
    border-left: 4px solid;
}

.issue-card {
    border-left-color: var(--color-error);
}

.issue-card.warning {
    border-left-color: var(--color-warning);
}

.suggestion-card {
    border-left-color: var(--color-info);
}

.a11y-card {
    border-left-color: var(--color-success);
}

.a11y-card.warning {
    border-left-color: var(--color-warning);
}

.a11y-card.error {
    border-left-color: var(--color-error);
}

.card-header {
    display: flex;
    align-items: flex-start;
    gap: 0.75rem;
    margin-bottom: 0.5rem;
}

.card-icon {
    font-size: 1.25rem;
    flex-shrink: 0;
}

.card-title {
    font-size: 0.9375rem;
    font-weight: 600;
    color: var(--color-text);
}

.card-description {
    font-size: 0.875rem;
    color: var(--color-text-muted);
    margin-left: 2rem;
}

.card-code {
    margin: 0.75rem 0 0 2rem;
    padding: 0.75rem;
    background: var(--color-bg-dark);
    color: var(--color-text-light);
    border-radius: var(--radius-sm);
    font-family: var(--font-mono);
    font-size: 0.8125rem;
    overflow-x: auto;
}

/* Summary Cards */
.summary-card {
    display: flex;
    align-items: center;
    gap: 1rem;
    padding: 1rem;
    background: var(--color-bg);
    border-radius: var(--radius-md);
    margin-bottom: 1rem;
}

.summary-icon {
    font-size: 2rem;
}

.summary-content h4 {
    font-size: 0.9375rem;
    font-weight: 600;
    margin-bottom: 0.25rem;
}

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

/* Status Indicator */
.status-pass {
    color: var(--color-success);
}

.status-warn {
    color: var(--color-warning);
}

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

/* Footer */
.footer {
    background: var(--color-bg-dark);
    color: var(--color-text-light);
    padding: 1.5rem 0;
    text-align: center;
}

.footer a {
    color: var(--color-primary-light);
    text-decoration: none;
    font-weight: 500;
    transition: color var(--transition-fast);
}

.footer a:hover {
    color: white;
    text-decoration: underline;
}

.footer .copyright {
    font-size: 0.875rem;
    color: var(--color-text-muted);
    margin-top: 0.5rem;
}

/* Responsive Design */
@media (max-width: 768px) {
    .header {
        padding: 1rem 0;
    }

    .logo {
        flex-direction: column;
        gap: 0.5rem;
    }

    .logo h1 {
        font-size: 1.5rem;
    }

    .logo-img {
        width: 40px;
        height: 40px;
    }

    .main {
        padding: 1rem 0;
    }

    .input-section,
    .results-section {
        padding: 1rem;
    }

    .css-input {
        min-height: 200px;
    }

    .button-group {
        flex-direction: column;
    }

    .btn {
        width: 100%;
        justify-content: center;
    }

    .tabs {
        gap: 0;
    }

    .tab {
        padding: 0.5rem 0.75rem;
        font-size: 0.8125rem;
    }

    .tab-icon {
        display: none;
    }

    .visualization-header {
        flex-direction: column;
        align-items: flex-start;
    }
}

@media (max-width: 480px) {
    .container {
        padding: 0 0.75rem;
    }

    .card-description,
    .card-code {
        margin-left: 0;
    }
}

/* Animation for loading state */
.loading {
    position: relative;
    pointer-events: none;
}

.loading::after {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: rgba(255, 255, 255, 0.8);
    display: flex;
    align-items: center;
    justify-content: center;
}

/* Print styles */
@media print {
    .header,
    .footer,
    .input-section,
    .tabs,
    .visualization-controls {
        display: none;
    }

    .results-section {
        box-shadow: none;
        padding: 0;
    }

    .tab-panel {
        display: block !important;
        page-break-inside: avoid;
    }
}