/* Font Face Declaration */
@font-face {
    font-family: 'Manuale';
    src: url('./fonts/Manuale-Italic-VariableFont_wght.ttf') format('truetype-variations');
    font-weight: 100 900;
    font-style: italic;
    font-display: swap;
}

/* CSS Custom Properties */
:root {
    --primary-color: #1976d2;
    --primary-hover: #1565c0;
    --secondary-color: #f5f5f5;
    --text-primary: #1a1a1a;
    --text-secondary: #666666;
    --text-tertiary: #999999;
    --background: #fafafa;
    --surface: #ffffff;
    --border-color: #e0e0e0;
    --shadow-light: 0 2px 8px rgba(0, 0, 0, 0.1);
    --shadow-medium: 0 4px 16px rgba(0, 0, 0, 0.15);
    --border-radius: 12px;
    --border-radius-small: 8px;
    --border-radius-large: 16px;
    --spacing-xs: 4px;
    --spacing-sm: 8px;
    --spacing-md: 16px;
    --spacing-lg: 24px;
    --spacing-xl: 32px;
    --font-family: -apple-system, BlinkMacSystemFont, 'SF Pro Display', 'PingFang SC', 'Helvetica Neue', Arial, sans-serif;
    --transition: all 0.2s cubic-bezier(0.4, 0.0, 0.2, 1);
}

/* Dark mode support */
@media (prefers-color-scheme: dark) {
    :root {
        --text-primary: #ffffff;
        --text-secondary: #b0b0b0;
        --text-tertiary: #808080;
        --background: #121212;
        --surface: #1e1e1e;
        --secondary-color: #2a2a2a;
        --border-color: #333333;
        --shadow-light: 0 2px 8px rgba(0, 0, 0, 0.3);
        --shadow-medium: 0 4px 16px rgba(0, 0, 0, 0.4);
    }
}

/* Reset and Base Styles */
* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

body {
    font-family: var(--font-family);
    background: var(--background);
    color: var(--text-primary);
    line-height: 1.6;
    min-height: 100vh;
    font-size: 14px;
}

/* Container */
.container {
    max-width: 1200px;
    margin: 0 auto;
    padding: var(--spacing-lg);
    min-height: 100vh;
}

/* Header */
.header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: var(--spacing-xl);
    padding: var(--spacing-md) 0;
}

.header-actions {
    display: flex;
    align-items: center;
    gap: var(--spacing-md);
}

.history-toggle {
    padding: var(--spacing-sm) var(--spacing-md);
    border: 1px solid var(--border-color);
    border-radius: var(--border-radius-small);
    background: var(--surface);
    color: var(--text-primary);
    font-family: var(--font-family);
    font-size: 14px;
    font-weight: 500;
    cursor: pointer;
    transition: var(--transition);
}

.history-toggle:hover {
    background: var(--secondary-color);
    color: var(--primary-color);
}

.logo {
    font-size: 38px;
    font-weight: 300;
    font-style: italic;
    color: var(--text-primary);
    font-family: 'Manuale', -apple-system, BlinkMacSystemFont, 'SF Pro Display', 'Georgia', 'Times New Roman', serif;
    letter-spacing: -0.5px;
}

.settings-toggle {
    padding: var(--spacing-sm) var(--spacing-md);
    border: 1px solid var(--border-color);
    border-radius: var(--border-radius-small);
    background: var(--surface);
    color: var(--text-primary);
    font-family: var(--font-family);
    font-size: 14px;
    font-weight: 500;
    cursor: pointer;
    transition: var(--transition);
    box-shadow: var(--shadow-light);
}

.settings-toggle:hover {
    background: var(--secondary-color);
    color: var(--primary-color);
    transform: translateY(-1px);
    box-shadow: var(--shadow-medium);
}

/* Settings Panel */
.settings-panel {
    position: fixed;
    top: 0;
    right: -400px;
    width: 400px;
    height: 100vh;
    background: var(--surface);
    border-left: 1px solid var(--border-color);
    z-index: 1000;
    padding: var(--spacing-lg);
    transition: var(--transition);
    overflow-y: auto;
    box-shadow: -8px 0 32px rgba(0, 0, 0, 0.1);
}

.settings-panel.open {
    right: 0;
}

.settings-panel h3 {
    margin-bottom: var(--spacing-lg);
    font-size: 20px;
    font-weight: 600;
}

/* Main Content */
.main-content {
    max-width: 800px;
    margin: 0 auto;
}

/* Translation Card */
.translation-card {
    background: var(--surface);
    border-radius: var(--border-radius-large);
    box-shadow: var(--shadow-medium);
    overflow: hidden;
    margin-bottom: var(--spacing-xl);
}

/* Language Header */
.language-header {
    display: flex;
    align-items: center;
    padding: var(--spacing-lg);
    border-bottom: 1px solid var(--border-color);
    gap: var(--spacing-md);
}

.language-selector {
    flex: 1;
}

.language-select {
    width: 100%;
    padding: var(--spacing-md);
    border: 1px solid var(--border-color);
    border-radius: var(--border-radius);
    background: var(--surface);
    color: var(--text-primary);
    font-family: var(--font-family);
    font-size: 14px;
    transition: var(--transition);
    appearance: none;
    background-image: url("data:image/svg+xml;charset=utf-8,%3Csvg xmlns='http://www.w3.org/2000/svg' width='12' height='12' fill='%23666'%3E%3Cpath d='M2 4l4 4 4-4z'/%3E%3C/svg%3E");
    background-repeat: no-repeat;
    background-position: right 12px center;
    padding-right: 40px;
}

.language-select:focus {
    outline: none;
    border-color: var(--primary-color);
    box-shadow: 0 0 0 2px rgba(25, 118, 210, 0.2);
}

.swap-btn {
    width: 40px;
    height: 40px;
    border: 1px solid var(--border-color);
    border-radius: var(--border-radius);
    background: var(--surface);
    color: var(--text-secondary);
    display: flex;
    align-items: center;
    justify-content: center;
    cursor: pointer;
    transition: var(--transition);
}

.swap-btn:hover {
    background: var(--secondary-color);
    color: var(--primary-color);
    transform: rotate(180deg);
}

/* Translation Content */
.translation-content {
    display: grid;
    grid-template-columns: 1fr 1fr;
    min-height: 300px;
}

.input-section,
.results-section {
    display: flex;
    flex-direction: column;
}

.input-section {
    border-right: 1px solid var(--border-color);
}

/* Section Headers */
.input-header,
.result-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: var(--spacing-md) var(--spacing-lg);
    border-bottom: 1px solid var(--border-color);
    background: var(--secondary-color);
}

.section-title {
    font-size: 13px;
    font-weight: 500;
    color: var(--text-secondary);
    text-transform: uppercase;
    letter-spacing: 0.5px;
}

.input-actions,
.result-actions {
    display: flex;
    gap: var(--spacing-sm);
    align-items: center;
}

.action-btn {
    width: 32px;
    height: 32px;
    border: none;
    border-radius: var(--border-radius-small);
    background: transparent;
    color: var(--text-secondary);
    display: flex;
    align-items: center;
    justify-content: center;
    cursor: pointer;
    transition: var(--transition);
}

.action-btn:hover {
    background: var(--border-color);
    color: var(--text-primary);
}

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

.result-lang-select {
    padding: var(--spacing-xs) var(--spacing-sm);
    border: 1px solid var(--border-color);
    border-radius: var(--border-radius-small);
    background: var(--surface);
    color: var(--text-secondary);
    font-size: 12px;
    appearance: none;
    cursor: pointer;
}

/* Text Areas and Content */
.translation-textarea {
    flex: 1;
    padding: var(--spacing-lg);
    border: none;
    background: transparent;
    color: var(--text-primary);
    font-family: var(--font-family);
    font-size: 16px;
    resize: none;
    outline: none;
    min-height: 200px;
}

.translation-textarea::placeholder {
    color: var(--text-tertiary);
}

.result-content {
    flex: 1;
    padding: var(--spacing-lg);
    display: flex;
    flex-direction: column;
    justify-content: flex-start;
}

.result-placeholder {
    color: var(--text-tertiary);
    font-style: italic;
    text-align: left;
}

.result-text {
    color: var(--text-primary);
    font-size: 16px;
    line-height: 1.6;
    white-space: pre-wrap;
    word-wrap: break-word;
    display: none;
}

.error-message {
    color: #d32f2f;
    background: rgba(211, 47, 47, 0.1);
    padding: var(--spacing-md);
    border-radius: var(--border-radius);
    border: 1px solid rgba(211, 47, 47, 0.2);
    display: none;
}

.char-count {
    position: absolute;
    bottom: var(--spacing-md);
    right: var(--spacing-lg);
    font-size: 12px;
    color: var(--text-tertiary);
    background: var(--surface);
    padding: 2px 6px;
    border-radius: 4px;
    border: 1px solid var(--border-color);
}

.input-section {
    position: relative;
}

/* Translation Action */
.translate-action {
    padding: var(--spacing-lg);
    border-top: 1px solid var(--border-color);
    display: flex;
    justify-content: center;
}

.translate-btn {
    padding: var(--spacing-md) var(--spacing-xl);
    border: none;
    border-radius: var(--border-radius);
    background: var(--primary-color);
    color: white;
    font-family: var(--font-family);
    font-size: 16px;
    font-weight: 500;
    cursor: pointer;
    transition: var(--transition);
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: var(--spacing-sm);
    min-width: 120px;
    position: relative;
}

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

.translate-btn:disabled {
    opacity: 0.6;
    cursor: not-allowed;
    transform: none;
}

.loading-spinner {
    width: 16px;
    height: 16px;
    border: 2px solid rgba(255, 255, 255, 0.3);
    border-top: 2px solid white;
    border-radius: 50%;
    animation: spin 1s linear infinite;
    display: none;
}

.translate-btn.loading .btn-text {
    opacity: 0;
}

.translate-btn.loading .loading-spinner {
    display: block;
    position: absolute;
}

@keyframes spin {
    0% { transform: rotate(0deg); }
    100% { transform: rotate(360deg); }
}

/* Form Elements */
.glass-card {
    background: var(--surface);
    border-radius: var(--border-radius);
    border: 1px solid var(--border-color);
    padding: var(--spacing-lg);
    box-shadow: var(--shadow-light);
    transition: var(--transition);
}

.input-group {
    margin-bottom: var(--spacing-lg);
    position: relative;
}

.input-group label {
    display: block;
    margin-bottom: var(--spacing-xs);
    font-weight: 500;
    color: var(--text-secondary);
    font-size: 13px;
}

select, input, textarea {
    width: 100%;
    padding: var(--spacing-md);
    border: 1px solid var(--border-color);
    border-radius: var(--border-radius-small);
    background: var(--surface);
    color: var(--text-primary);
    font-family: var(--font-family);
    font-size: 14px;
    transition: var(--transition);
}

select:focus, input:focus, textarea:focus {
    outline: none;
    border-color: var(--primary-color);
    box-shadow: 0 0 0 2px rgba(25, 118, 210, 0.2);
}

.toggle-btn {
    position: absolute;
    right: var(--spacing-sm);
    top: 50%;
    transform: translateY(-50%);
    background: none;
    border: none;
    cursor: pointer;
    font-size: 14px;
    color: var(--text-secondary);
    width: auto;
    padding: var(--spacing-xs);
}

/* Buttons */
.btn {
    padding: var(--spacing-md) var(--spacing-lg);
    border: none;
    border-radius: var(--border-radius-small);
    font-family: var(--font-family);
    font-size: 14px;
    font-weight: 500;
    cursor: pointer;
    transition: var(--transition);
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: var(--spacing-sm);
}

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

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

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

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

.btn-small {
    padding: var(--spacing-sm) var(--spacing-md);
    font-size: 12px;
}

/* History Panel */
.history-panel {
    position: fixed;
    top: 0;
    right: -450px;
    width: 450px;
    height: 100vh;
    background: var(--surface);
    border-left: 1px solid var(--border-color);
    z-index: 999;
    transition: var(--transition);
    overflow: hidden;
    box-shadow: -8px 0 32px rgba(0, 0, 0, 0.1);
}

.history-panel.open {
    right: 0;
}

.history-panel-content {
    height: 100%;
    display: flex;
    flex-direction: column;
}

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

.history-panel-header h3 {
    font-size: 18px;
    font-weight: 600;
    color: var(--text-primary);
    margin: 0;
}

.history-panel-controls {
    display: flex;
    gap: var(--spacing-sm);
}

.history-content {
    flex: 1;
    overflow-y: auto;
    padding: var(--spacing-md);
}

.history-content.collapsed {
    display: none;
}

.history-placeholder {
    text-align: center;
    color: var(--text-tertiary);
    font-style: italic;
    padding: var(--spacing-xl);
}

.history-item {
    background: var(--surface);
    border: 1px solid var(--border-color);
    border-radius: var(--border-radius-small);
    padding: var(--spacing-md);
    margin-bottom: var(--spacing-md);
    transition: var(--transition);
}

.history-item:hover {
    transform: translateY(-1px);
    box-shadow: var(--shadow-light);
}

.history-meta {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: var(--spacing-sm);
    font-size: 12px;
    color: var(--text-tertiary);
}

.history-text {
    margin-bottom: var(--spacing-sm);
}

.history-source {
    color: var(--text-secondary);
    font-size: 13px;
    margin-bottom: var(--spacing-xs);
}

.history-result {
    color: var(--text-primary);
    font-weight: 500;
}

.history-actions {
    display: flex;
    justify-content: flex-end;
    gap: var(--spacing-sm);
}

/* Toast Notification */
.toast {
    position: fixed;
    bottom: var(--spacing-lg);
    right: var(--spacing-lg);
    background: var(--surface);
    border: 1px solid var(--border-color);
    border-radius: var(--border-radius-small);
    padding: var(--spacing-md) var(--spacing-lg);
    color: var(--text-primary);
    box-shadow: var(--shadow-medium);
    transform: translateY(100px);
    opacity: 0;
    transition: var(--transition);
    z-index: 1001;
}

.toast.show {
    transform: translateY(0);
    opacity: 1;
}

.translation-info {
    margin-top: var(--spacing-md);
    font-size: 12px;
    color: var(--text-tertiary);
    display: none;
}

/* Responsive Design */
@media (max-width: 768px) {
    .container {
        padding: var(--spacing-md);
    }
    
    .header {
        margin-bottom: var(--spacing-lg);
    }
    
    .logo {
        font-size: 20px;
    }
    
    .translation-content {
        grid-template-columns: 1fr;
        min-height: auto;
    }
    
    .input-section {
        border-right: none;
        border-bottom: 1px solid var(--border-color);
    }
    
    .language-header {
        padding: var(--spacing-md);
        gap: var(--spacing-sm);
    }
    
    .language-selector {
        flex: 1;
    }
    
    .swap-btn {
        flex-shrink: 0;
        width: 32px;
        height: 32px;
    }
    
    .translation-textarea {
        min-height: 150px;
        font-size: 16px; /* Prevent zoom on iOS */
    }
    
    .result-content {
        min-height: 150px;
    }
    
    .settings-panel {
        width: 100vw;
        right: -100vw;
    }
    
    .history-panel {
        width: 100vw;
        right: -100vw;
    }
    
    .history-header {
        flex-direction: column;
        gap: var(--spacing-sm);
        align-items: stretch;
    }
    
    .history-controls {
        justify-content: center;
    }
    
    .toast {
        right: var(--spacing-sm);
        left: var(--spacing-sm);
    }
}

@media (max-width: 480px) {
    .container {
        padding: var(--spacing-sm);
    }
    
    .language-header {
        padding: var(--spacing-md);
    }
    
    .translation-textarea,
    .result-content {
        padding: var(--spacing-md);
    }
    
    .translate-action {
        padding: var(--spacing-md);
    }
    
    .translate-btn {
        width: 100%;
    }
}

/* Accessibility */
@media (prefers-reduced-motion: reduce) {
    * {
        animation-duration: 0.01ms !important;
        animation-iteration-count: 1 !important;
        transition-duration: 0.01ms !important;
    }
}

/* Focus visible for keyboard navigation */
.btn:focus-visible,
select:focus-visible,
input:focus-visible,
textarea:focus-visible,
.action-btn:focus-visible {
    outline: 2px solid var(--primary-color);
    outline-offset: 2px;
}

/* High contrast mode support */
@media (prefers-contrast: high) {
    :root {
        --border-color: #000000;
        --shadow-light: 0 2px 8px rgba(0, 0, 0, 0.3);
        --shadow-medium: 0 4px 16px rgba(0, 0, 0, 0.4);
    }
}

/* Footer */
.footer {
    text-align: center;
    padding: var(--spacing-lg) 0;
    margin-top: var(--spacing-xl);
}

.footer-credit {
    font-size: 12px;
    color: var(--text-tertiary);
    margin: 0;
    opacity: 0.7;
}

/* Print styles */
@media print {
    .settings-panel,
    .translate-action,
    .history-controls,
    .toast,
    .input-actions,
    .result-actions,
    .footer {
        display: none;
    }
    
    .translation-card {
        box-shadow: none;
        border: 1px solid #ccc;
    }
    
    .translation-content {
        grid-template-columns: 1fr;
    }
}