/* CSS Variables */
:root {
    --primary-color: #6366f1;
    --primary-hover: #4f46e5;
    --secondary-color: #64748b;
    --background-color: #0f172a;
    --surface-color: #1e293b;
    --surface-light: #334155;
    --text-primary: #f1f5f9;
    --text-secondary: #94a3b8;
    --border-color: #334155;
    --success-color: #10b981;
    --error-color: #ef4444;
    --warning-color: #f59e0b;
    --border-radius: 12px;
    --border-radius-sm: 8px;
    --shadow: 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);
    --transition: all 0.2s ease;
}

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

/* Base Styles */
html {
    font-size: 16px;
    scroll-behavior: smooth;
}

body {
    font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, Oxygen, Ubuntu, Cantarell, sans-serif;
    background-color: var(--background-color);
    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 {
    text-align: center;
    padding: 2rem 1rem;
    background: linear-gradient(135deg, var(--surface-color) 0%, var(--background-color) 100%);
    border-bottom: 1px solid var(--border-color);
}

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

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

.header h1 {
    font-size: 2rem;
    font-weight: 700;
    background: linear-gradient(135deg, var(--primary-color), #a855f7);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

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

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

/* Translator Container */
.translator-container {
    display: grid;
    grid-template-columns: 1fr auto 1fr;
    gap: 1rem;
    align-items: start;
}

@media (max-width: 968px) {
    .translator-container {
        grid-template-columns: 1fr;
        gap: 1rem;
    }
}

/* Code Panels */
.code-panel {
    background: var(--surface-color);
    border-radius: var(--border-radius);
    border: 1px solid var(--border-color);
    overflow: hidden;
}

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

.panel-header label {
    font-weight: 600;
    color: var(--text-primary);
}

/* Language Select */
.language-select {
    padding: 0.5rem 1rem;
    background: var(--surface-color);
    border: 1px solid var(--border-color);
    border-radius: var(--border-radius-sm);
    color: var(--text-primary);
    font-size: 0.875rem;
    cursor: pointer;
    transition: var(--transition);
}

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

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

/* Code Input/Output */
.code-input-wrapper,
.code-output-wrapper {
    position: relative;
    min-height: 300px;
}

.code-input {
    width: 100%;
    min-height: 300px;
    padding: 1rem;
    background: transparent;
    border: none;
    color: var(--text-primary);
    font-family: 'Fira Code', 'Consolas', 'Monaco', monospace;
    font-size: 0.875rem;
    line-height: 1.6;
    resize: vertical;
    position: relative;
    z-index: 1;
}

.code-input:focus {
    outline: none;
}

.code-input::placeholder {
    color: var(--text-secondary);
}

.code-highlight {
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    padding: 1rem;
    margin: 0;
    pointer-events: none;
    overflow: auto;
    background: transparent !important;
}

.code-highlight code {
    font-family: 'Fira Code', 'Consolas', 'Monaco', monospace;
    font-size: 0.875rem;
    line-height: 1.6;
    background: transparent !important;
}

.code-output {
    min-height: 300px;
    padding: 1rem;
    margin: 0;
    background: var(--surface-color);
    overflow: auto;
}

.code-output code {
    font-family: 'Fira Code', 'Consolas', 'Monaco', monospace;
    font-size: 0.875rem;
    line-height: 1.6;
    background: transparent !important;
}

.output-placeholder {
    position: absolute;
    top: 50%;
    left: 50%;
    transform: translate(-50%, -50%);
    text-align: center;
    color: var(--text-secondary);
}

.output-placeholder svg {
    opacity: 0.3;
    margin-bottom: 1rem;
}

.output-placeholder p {
    font-size: 0.875rem;
}

/* Panel Actions */
.panel-actions {
    display: flex;
    gap: 0.5rem;
    padding: 0.75rem 1rem;
    background: var(--surface-light);
    border-top: 1px solid var(--border-color);
}

/* Translation Controls */
.translation-controls {
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    gap: 1rem;
    padding: 1rem 0;
}

@media (max-width: 968px) {
    .translation-controls {
        flex-direction: row;
        padding: 0.5rem 0;
    }

    .translation-controls .btn-icon svg {
        transform: rotate(90deg);
    }
}

/* Buttons */
.btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: 0.5rem;
    padding: 0.625rem 1.25rem;
    border: none;
    border-radius: var(--border-radius-sm);
    font-size: 0.875rem;
    font-weight: 500;
    cursor: pointer;
    transition: var(--transition);
}

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

.btn-primary:hover {
    background: var(--primary-hover);
    transform: translateY(-1px);
    box-shadow: var(--shadow-lg);
}

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

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

.btn-icon {
    width: 48px;
    height: 48px;
    padding: 0;
    border-radius: 50%;
    background: var(--surface-color);
    color: var(--text-primary);
    border: 1px solid var(--border-color);
}

.btn-icon:hover {
    background: var(--surface-light);
    border-color: var(--primary-color);
    color: var(--primary-color);
}

/* Spinner */
.spinner {
    width: 20px;
    height: 20px;
    animation: spin 1s linear infinite;
}

@keyframes spin {
    from {
        transform: rotate(0deg);
    }
    to {
        transform: rotate(360deg);
    }
}

/* Comparison Section */
.comparison-section {
    margin-top: 2rem;
    background: var(--surface-color);
    border-radius: var(--border-radius);
    border: 1px solid var(--border-color);
    padding: 1.5rem;
}

.comparison-section h2 {
    font-size: 1.25rem;
    margin-bottom: 1rem;
    color: var(--text-primary);
}

.comparison-container {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 1rem;
}

@media (max-width: 768px) {
    .comparison-container {
        grid-template-columns: 1fr;
    }
}

.comparison-panel {
    background: var(--background-color);
    border-radius: var(--border-radius-sm);
    overflow: hidden;
}

.comparison-panel h3 {
    font-size: 0.875rem;
    font-weight: 600;
    padding: 0.75rem 1rem;
    background: var(--surface-light);
    color: var(--text-secondary);
}

.comparison-code {
    padding: 1rem;
    margin: 0;
    max-height: 300px;
    overflow: auto;
    background: var(--background-color) !important;
}

.comparison-code code {
    font-family: 'Fira Code', 'Consolas', 'Monaco', monospace;
    font-size: 0.8125rem;
    line-height: 1.5;
    background: transparent !important;
}

#hide-comparison {
    margin-top: 1rem;
}

/* Features Section */
.features-section {
    margin-top: 3rem;
}

.features-section h2 {
    font-size: 1.5rem;
    font-weight: 700;
    text-align: center;
    margin-bottom: 2rem;
    color: var(--text-primary);
}

.features-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: 1.5rem;
}

.feature-card {
    background: var(--surface-color);
    border-radius: var(--border-radius);
    border: 1px solid var(--border-color);
    padding: 1.5rem;
    transition: var(--transition);
}

.feature-card:hover {
    transform: translateY(-4px);
    box-shadow: var(--shadow-lg);
    border-color: var(--primary-color);
}

.feature-icon {
    width: 48px;
    height: 48px;
    display: flex;
    align-items: center;
    justify-content: center;
    background: linear-gradient(135deg, var(--primary-color), #a855f7);
    border-radius: var(--border-radius-sm);
    margin-bottom: 1rem;
}

.feature-icon svg {
    color: white;
}

.feature-card h3 {
    font-size: 1rem;
    font-weight: 600;
    margin-bottom: 0.5rem;
    color: var(--text-primary);
}

.feature-card p {
    font-size: 0.875rem;
    color: var(--text-secondary);
    line-height: 1.6;
}

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

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

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

.footer a:hover {
    color: var(--primary-hover);
    text-decoration: underline;
}

/* Toast Notifications */
.toast {
    position: fixed;
    bottom: 2rem;
    left: 50%;
    transform: translateX(-50%);
    background: var(--surface-light);
    color: var(--text-primary);
    padding: 0.75rem 1.5rem;
    border-radius: var(--border-radius-sm);
    box-shadow: var(--shadow-lg);
    z-index: 1000;
    animation: slideUp 0.3s ease;
}

.toast.success {
    background: var(--success-color);
    color: white;
}

.toast.error {
    background: var(--error-color);
    color: white;
}

@keyframes slideUp {
    from {
        opacity: 0;
        transform: translateX(-50%) translateY(20px);
    }
    to {
        opacity: 1;
        transform: translateX(-50%) translateY(0);
    }
}

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

::-webkit-scrollbar-track {
    background: var(--surface-color);
}

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

::-webkit-scrollbar-thumb:hover {
    background: var(--border-color);
}

/* Mobile Responsive Adjustments */
@media (max-width: 640px) {
    .header h1 {
        font-size: 1.5rem;
    }

    .tagline {
        font-size: 0.875rem;
    }

    .main-content {
        padding: 1rem 0.75rem;
    }

    .code-input-wrapper,
    .code-output-wrapper {
        min-height: 200px;
    }

    .code-input,
    .code-output {
        min-height: 200px;
        font-size: 0.8125rem;
    }

    .panel-header {
        flex-direction: column;
        gap: 0.5rem;
        align-items: flex-start;
    }

    .language-select {
        width: 100%;
    }

    .panel-actions {
        flex-wrap: wrap;
    }

    .panel-actions .btn {
        flex: 1;
        min-width: 80px;
    }

    .features-section h2 {
        font-size: 1.25rem;
    }

    .feature-card {
        padding: 1rem;
    }
}

/* Print Styles */
@media print {
    .translation-controls,
    .panel-actions,
    .features-section {
        display: none;
    }

    .code-panel {
        break-inside: avoid;
    }
}