/* CSS Variables for theming */
:root {
    --bg-primary: #1a1a2e;
    --bg-secondary: #16213e;
    --bg-tertiary: #0f3460;
    --text-primary: #eaeaea;
    --text-secondary: #a0a0a0;
    --accent-primary: #e94560;
    --accent-secondary: #0f3460;
    --border-color: #2a2a4a;
    --code-bg: #0d1117;
    --code-text: #c9d1d9;
    --success: #4caf50;
    --warning: #ff9800;
    --error: #f44336;
    --shadow: 0 4px 6px rgba(0, 0, 0, 0.3);
    --radius: 8px;
    --transition: all 0.3s ease;
}

/* Light theme */
[data-theme="light"] {
    --bg-primary: #f5f5f5;
    --bg-secondary: #ffffff;
    --bg-tertiary: #e0e0e0;
    --text-primary: #1a1a1a;
    --text-secondary: #666666;
    --border-color: #d0d0d0;
    --code-bg: #f6f8fa;
    --code-text: #24292e;
    --shadow: 0 4px 6px rgba(0, 0, 0, 0.1);
}

/* Monokai theme */
[data-theme="monokai"] {
    --bg-primary: #272822;
    --bg-secondary: #3e3d32;
    --bg-tertiary: #49483e;
    --text-primary: #f8f8f2;
    --text-secondary: #75715e;
    --accent-primary: #f92672;
    --border-color: #49483e;
    --code-bg: #272822;
    --code-text: #f8f8f2;
}

/* Solarized theme */
[data-theme="solarized"] {
    --bg-primary: #002b36;
    --bg-secondary: #073642;
    --bg-tertiary: #094652;
    --text-primary: #839496;
    --text-secondary: #657b83;
    --accent-primary: #cb4b16;
    --border-color: #094652;
    --code-bg: #002b36;
    --code-text: #839496;
}

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

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

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

/* App container */
.app-container {
    display: flex;
    flex-direction: column;
    min-height: 100vh;
}

/* Header */
.header {
    background: linear-gradient(135deg, var(--bg-secondary) 0%, var(--bg-tertiary) 100%);
    padding: 2rem 1rem;
    text-align: center;
    border-bottom: 1px solid var(--border-color);
}

.header-content {
    max-width: 1200px;
    margin: 0 auto;
}

.logo-section {
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 1rem;
    margin-bottom: 0.5rem;
}

.logo {
    width: 48px;
    height: 48px;
    object-fit: contain;
}

.header h1 {
    font-size: 2rem;
    font-weight: 700;
    background: linear-gradient(90deg, var(--text-primary), var(--accent-primary));
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.tagline {
    color: var(--text-secondary);
    font-size: 1rem;
    margin-top: 0.5rem;
}

/* Main content */
.main-content {
    flex: 1;
    max-width: 1400px;
    margin: 0 auto;
    padding: 2rem 1rem;
    width: 100%;
}

/* Sections */
section {
    background: var(--bg-secondary);
    border-radius: var(--radius);
    padding: 1.5rem;
    margin-bottom: 2rem;
    border: 1px solid var(--border-color);
    box-shadow: var(--shadow);
}

section h2 {
    font-size: 1.25rem;
    margin-bottom: 1rem;
    color: var(--text-primary);
    border-bottom: 2px solid var(--accent-primary);
    padding-bottom: 0.5rem;
    display: inline-block;
}

/* Control group */
.control-group {
    margin-bottom: 1.5rem;
}

.control-group:last-child {
    margin-bottom: 0;
}

.sample-controls {
    display: flex;
    align-items: center;
    gap: 1rem;
    margin-bottom: 1rem;
    flex-wrap: wrap;
}

.sample-controls label {
    color: var(--text-secondary);
    font-size: 0.9rem;
}

/* Custom text input */
.custom-text-input {
    width: 100%;
    min-height: 120px;
    padding: 1rem;
    background: var(--code-bg);
    border: 1px solid var(--border-color);
    border-radius: var(--radius);
    color: var(--code-text);
    font-family: 'Fira Code', 'Source Code Pro', monospace;
    font-size: 14px;
    resize: vertical;
    transition: var(--transition);
}

.custom-text-input:focus {
    outline: none;
    border-color: var(--accent-primary);
    box-shadow: 0 0 0 2px rgba(233, 69, 96, 0.2);
}

/* Options grid */
.options-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
    gap: 1rem;
}

.option-item {
    display: flex;
    flex-direction: column;
    gap: 0.5rem;
}

.option-item label {
    color: var(--text-secondary);
    font-size: 0.85rem;
}

.option-item input[type="range"] {
    width: 100%;
    height: 6px;
    -webkit-appearance: none;
    appearance: none;
    background: var(--bg-tertiary);
    border-radius: 3px;
    cursor: pointer;
}

.option-item input[type="range"]::-webkit-slider-thumb {
    -webkit-appearance: none;
    width: 16px;
    height: 16px;
    background: var(--accent-primary);
    border-radius: 50%;
    cursor: pointer;
    transition: var(--transition);
}

.option-item input[type="range"]::-webkit-slider-thumb:hover {
    transform: scale(1.2);
}

.option-item span {
    font-size: 0.85rem;
    color: var(--accent-primary);
    font-weight: 600;
}

.checkbox-item {
    flex-direction: row;
    align-items: center;
}

.checkbox-item input[type="checkbox"] {
    width: 18px;
    height: 18px;
    accent-color: var(--accent-primary);
    cursor: pointer;
}

/* Select styling */
select {
    padding: 0.5rem 1rem;
    background: var(--bg-tertiary);
    border: 1px solid var(--border-color);
    border-radius: var(--radius);
    color: var(--text-primary);
    font-size: 0.9rem;
    cursor: pointer;
    transition: var(--transition);
}

select:focus {
    outline: none;
    border-color: var(--accent-primary);
}

select:hover {
    border-color: var(--accent-primary);
}

/* Font selection section */
.font-selection-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(180px, 1fr));
    gap: 0.75rem;
    margin-bottom: 1rem;
}

.font-checkbox {
    display: flex;
    align-items: center;
    gap: 0.5rem;
    padding: 0.75rem;
    background: var(--bg-tertiary);
    border-radius: var(--radius);
    cursor: pointer;
    transition: var(--transition);
    border: 2px solid transparent;
}

.font-checkbox:hover {
    border-color: var(--accent-primary);
}

.font-checkbox.selected {
    border-color: var(--accent-primary);
    background: rgba(233, 69, 96, 0.1);
}

.font-checkbox input[type="checkbox"] {
    width: 16px;
    height: 16px;
    accent-color: var(--accent-primary);
    cursor: pointer;
}

.font-checkbox label {
    cursor: pointer;
    font-size: 0.9rem;
    white-space: nowrap;
    overflow: hidden;
    text-overflow: ellipsis;
}

.selection-actions {
    display: flex;
    align-items: center;
    gap: 1rem;
    flex-wrap: wrap;
}

#selected-count {
    color: var(--text-secondary);
    font-size: 0.9rem;
}

/* Buttons */
.btn {
    padding: 0.6rem 1.2rem;
    border: none;
    border-radius: var(--radius);
    font-size: 0.9rem;
    font-weight: 600;
    cursor: pointer;
    transition: var(--transition);
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: 0.5rem;
}

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

.btn-primary:hover {
    background: #d13a52;
    transform: translateY(-2px);
}

.btn-secondary {
    background: var(--bg-tertiary);
    color: var(--text-primary);
    border: 1px solid var(--border-color);
}

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

.btn-icon {
    padding: 0.5rem;
    background: var(--bg-tertiary);
    color: var(--text-secondary);
    border: 1px solid var(--border-color);
}

.btn-icon.active {
    background: var(--accent-primary);
    color: white;
    border-color: var(--accent-primary);
}

.btn-icon:hover:not(.active) {
    color: var(--text-primary);
    border-color: var(--accent-primary);
}

/* Comparison section */
.comparison-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 1rem;
    flex-wrap: wrap;
    gap: 1rem;
}

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

.view-toggle {
    display: flex;
    gap: 0.5rem;
}

/* Comparison grid */
.comparison-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(350px, 1fr));
    gap: 1.5rem;
}

.comparison-grid.list-view {
    grid-template-columns: 1fr;
}

/* Font panel */
.font-panel {
    background: var(--bg-tertiary);
    border-radius: var(--radius);
    overflow: hidden;
    border: 1px solid var(--border-color);
    transition: var(--transition);
}

.font-panel:hover {
    border-color: var(--accent-primary);
    box-shadow: 0 8px 16px rgba(0, 0, 0, 0.2);
}

.font-panel-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 1rem;
    background: var(--bg-secondary);
    border-bottom: 1px solid var(--border-color);
}

.font-panel-header h3 {
    font-size: 1rem;
    color: var(--text-primary);
}

.font-panel-header .font-category {
    font-size: 0.75rem;
    color: var(--text-secondary);
    background: var(--bg-tertiary);
    padding: 0.25rem 0.5rem;
    border-radius: 4px;
}

.font-panel-content {
    padding: 1rem;
    background: var(--code-bg);
    min-height: 200px;
    overflow-x: auto;
}

.font-panel-content pre {
    margin: 0;
    white-space: pre-wrap;
    word-wrap: break-word;
}

.font-panel-content code {
    color: var(--code-text);
    line-height: inherit;
}

/* Analysis section */
.analysis-description {
    color: var(--text-secondary);
    margin-bottom: 1rem;
}

.analysis-results {
    margin-top: 1.5rem;
}

.analysis-card {
    background: var(--bg-tertiary);
    border-radius: var(--radius);
    padding: 1.25rem;
    margin-bottom: 1rem;
    border: 1px solid var(--border-color);
}

.analysis-card h4 {
    font-size: 1rem;
    margin-bottom: 1rem;
    color: var(--text-primary);
    display: flex;
    align-items: center;
    gap: 0.5rem;
}

.analysis-metrics {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(150px, 1fr));
    gap: 1rem;
}

.metric {
    text-align: center;
    padding: 0.75rem;
    background: var(--bg-secondary);
    border-radius: var(--radius);
}

.metric-label {
    font-size: 0.75rem;
    color: var(--text-secondary);
    margin-bottom: 0.25rem;
}

.metric-value {
    font-size: 1.5rem;
    font-weight: 700;
    color: var(--accent-primary);
}

.metric-bar {
    height: 8px;
    background: var(--bg-secondary);
    border-radius: 4px;
    margin-top: 0.5rem;
    overflow: hidden;
}

.metric-bar-fill {
    height: 100%;
    background: var(--accent-primary);
    border-radius: 4px;
    transition: width 0.5s ease;
}

.score-excellent { color: var(--success); }
.score-good { color: #8bc34a; }
.score-average { color: var(--warning); }
.score-poor { color: var(--error); }

.character-test {
    display: flex;
    flex-wrap: wrap;
    gap: 0.5rem;
    margin-top: 0.75rem;
}

.char-pair {
    display: flex;
    flex-direction: column;
    align-items: center;
    padding: 0.5rem;
    background: var(--code-bg);
    border-radius: 4px;
    min-width: 60px;
}

.char-display {
    font-size: 1.5rem;
    color: var(--code-text);
    letter-spacing: 0.25rem;
}

.char-label {
    font-size: 0.65rem;
    color: var(--text-secondary);
    margin-top: 0.25rem;
}

/* Footer */
.footer {
    background: var(--bg-secondary);
    border-top: 1px solid var(--border-color);
    padding: 1.5rem;
    text-align: center;
    margin-top: auto;
}

.footer-content p {
    color: var(--text-secondary);
    font-size: 0.9rem;
}

.footer-content a {
    color: var(--accent-primary);
    text-decoration: none;
    font-weight: 600;
    transition: var(--transition);
}

.footer-content a:hover {
    text-decoration: underline;
    color: #ff6b7a;
}

/* Empty state */
.empty-state {
    text-align: center;
    padding: 3rem;
    color: var(--text-secondary);
}

.empty-state svg {
    width: 64px;
    height: 64px;
    margin-bottom: 1rem;
    opacity: 0.5;
}

/* Loading state */
.loading {
    display: inline-block;
    width: 20px;
    height: 20px;
    border: 2px solid var(--text-secondary);
    border-radius: 50%;
    border-top-color: var(--accent-primary);
    animation: spin 1s ease-in-out infinite;
}

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

/* Responsive design */
@media (max-width: 768px) {
    .header h1 {
        font-size: 1.5rem;
    }

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

    .tagline {
        font-size: 0.9rem;
    }

    section {
        padding: 1rem;
    }

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

    .font-selection-grid {
        grid-template-columns: repeat(auto-fill, minmax(140px, 1fr));
    }

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

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

    .selection-actions {
        flex-direction: column;
        align-items: flex-start;
    }

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

    .sample-controls {
        flex-direction: column;
        align-items: flex-start;
    }
}

@media (max-width: 480px) {
    .main-content {
        padding: 1rem 0.5rem;
    }

    .font-selection-grid {
        grid-template-columns: 1fr 1fr;
    }

    .font-checkbox {
        padding: 0.5rem;
    }

    .font-checkbox label {
        font-size: 0.8rem;
    }

    .analysis-metrics {
        grid-template-columns: 1fr;
    }

    .btn {
        width: 100%;
    }
}

/* Scrollbar styling */
::-webkit-scrollbar {
    width: 8px;
    height: 8px;
}

::-webkit-scrollbar-track {
    background: var(--bg-tertiary);
}

::-webkit-scrollbar-thumb {
    background: var(--border-color);
    border-radius: 4px;
}

::-webkit-scrollbar-thumb:hover {
    background: var(--accent-primary);
}

/* Print styles */
@media print {
    .controls-section,
    .font-selection-section,
    .analysis-section,
    .footer {
        display: none;
    }

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

    .font-panel {
        break-inside: avoid;
        page-break-inside: avoid;
    }
}