:root {
    /* Light Theme (Default) */
    --bg-primary: rgba(255, 255, 255, 0.85);
    --bg-secondary: rgba(245, 247, 250, 0.9);
    --text-primary: #1a1a2e;
    --text-secondary: #4a5568;
    --border-color: rgba(0, 0, 0, 0.1);
    --accent-primary: #6366f1;
    --accent-secondary: #8b5cf6;
    --glass-bg: rgba(255, 255, 255, 0.2);
    --glass-border: rgba(255, 255, 255, 0.3);
    --shadow-sm: 0 8px 32px rgba(0, 0, 0, 0.1);
    --shadow-lg: 0 20px 60px rgba(0, 0, 0, 0.2);
    --card-bg: rgba(255, 255, 255, 0.7);
    --hover-bg: rgba(0, 0, 0, 0.05);
    --code-bg: #f5f5f5;
}

[data-theme="dark"] {
    --bg-primary: rgba(10, 10, 25, 0.9);
    --bg-secondary: rgba(20, 20, 40, 0.95);
    --text-primary: #f0f0f0;
    --text-secondary: #a0a0b0;
    --border-color: rgba(255, 255, 255, 0.1);
    --accent-primary: #818cf8;
    --accent-secondary: #a78bfa;
    --glass-bg: rgba(0, 0, 0, 0.3);
    --glass-border: rgba(255, 255, 255, 0.1);
    --shadow-sm: 0 8px 32px rgba(0, 0, 0, 0.3);
    --shadow-lg: 0 20px 60px rgba(0, 0, 0, 0.4);
    --card-bg: rgba(30, 30, 50, 0.7);
    --hover-bg: rgba(255, 255, 255, 0.1);
    --code-bg: #1e1e2e;
}

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

body {
    font-family: 'Inter', 'Vazirmatn', system-ui, sans-serif;
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    min-height: 100vh;
    direction: rtl;
    overflow-x: hidden;
    position: relative;
}

/* Glass Background Effects */
.glass-bg {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    pointer-events: none;
    z-index: 0;
}

.gradient-1 {
    background: radial-gradient(circle at 20% 80%, rgba(120, 119, 198, 0.3) 0%, transparent 50%);
}

.gradient-2 {
    background: radial-gradient(circle at 80% 20%, rgba(255, 119, 119, 0.3) 0%, transparent 50%);
}

.gradient-3 {
    background: radial-gradient(circle at 40% 40%, rgba(119, 255, 190, 0.2) 0%, transparent 50%);
}

.app-container {
    display: flex;
    min-height: 100vh;
    position: relative;
    z-index: 1;
    backdrop-filter: blur(8px);
}

/* Sidebar */
.sidebar {
    width: 280px;
    background: var(--glass-bg);
    backdrop-filter: blur(20px);
    border-left: 1px solid var(--glass-border);
    display: flex;
    flex-direction: column;
    transition: transform 0.3s ease;
    z-index: 10;
}

.sidebar-header {
    padding: 24px 20px;
    border-bottom: 1px solid var(--border-color);
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.logo {
    display: flex;
    align-items: center;
    gap: 10px;
    font-size: 1.25rem;
    font-weight: 700;
    color: var(--text-primary);
}

.logo i {
    font-size: 1.75rem;
    background: linear-gradient(135deg, var(--accent-primary), var(--accent-secondary));
    background-clip: text;
    -webkit-background-clip: text;
    color: transparent;
}

.new-chat-btn {
    background: linear-gradient(135deg, var(--accent-primary), var(--accent-secondary));
    border: none;
    color: white;
    padding: 8px 12px;
    border-radius: 40px;
    cursor: pointer;
    font-size: 0.875rem;
    display: flex;
    align-items: center;
    gap: 6px;
    transition: transform 0.2s;
}

.new-chat-btn:hover {
    transform: scale(1.05);
}

.history-list {
    flex: 1;
    overflow-y: auto;
    padding: 16px;
    display: flex;
    flex-direction: column;
    gap: 8px;
}

.history-item {
    background: var(--card-bg);
    backdrop-filter: blur(10px);
    padding: 12px;
    border-radius: 12px;
    cursor: pointer;
    transition: all 0.2s;
    border: 1px solid transparent;
}

.history-item:hover {
    border-color: var(--accent-primary);
    transform: translateX(-4px);
}

.history-item-text {
    font-size: 0.85rem;
    color: var(--text-secondary);
    overflow: hidden;
    text-overflow: ellipsis;
    white-space: nowrap;
}

.history-item-date {
    font-size: 0.7rem;
    color: var(--text-secondary);
    opacity: 0.7;
    margin-top: 4px;
}

.sidebar-footer {
    padding: 20px;
    border-top: 1px solid var(--border-color);
    display: flex;
    gap: 12px;
}

.theme-toggle, .clear-history {
    flex: 1;
    background: var(--card-bg);
    border: 1px solid var(--border-color);
    padding: 10px;
    border-radius: 12px;
    cursor: pointer;
    color: var(--text-primary);
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 8px;
    transition: all 0.2s;
}

.theme-toggle:hover, .clear-history:hover {
    background: var(--accent-primary);
    color: white;
}

/* Main Content */
.main-content {
    flex: 1;
    display: flex;
    flex-direction: column;
    overflow-x: hidden;
}

/* Top Bar */
.top-bar {
    padding: 16px 24px;
    background: var(--glass-bg);
    backdrop-filter: blur(20px);
    border-bottom: 1px solid var(--glass-border);
    display: flex;
    align-items: center;
    gap: 16px;
    flex-wrap: wrap;
}

.menu-toggle {
    display: none;
    background: none;
    border: none;
    font-size: 1.5rem;
    cursor: pointer;
    color: var(--text-primary);
}

.language-selector {
    display: flex;
    align-items: center;
    gap: 12px;
    background: var(--card-bg);
    padding: 8px 16px;
    border-radius: 60px;
    backdrop-filter: blur(10px);
}

.lang-card {
    position: relative;
}

.lang-btn {
    background: none;
    border: none;
    padding: 8px 16px;
    cursor: pointer;
    color: var(--text-primary);
    font-size: 0.875rem;
    display: flex;
    align-items: center;
    gap: 8px;
}

.lang-dropdown {
    position: absolute;
    top: 100%;
    right: 0;
    background: var(--card-bg);
    backdrop-filter: blur(20px);
    border-radius: 12px;
    padding: 8px;
    display: none;
    flex-direction: column;
    gap: 4px;
    min-width: 140px;
    z-index: 100;
    border: 1px solid var(--border-color);
}

.lang-dropdown.active {
    display: flex;
}

.lang-dropdown button {
    background: none;
    border: none;
    padding: 8px 12px;
    text-align: right;
    cursor: pointer;
    color: var(--text-primary);
    border-radius: 8px;
}

.lang-dropdown button:hover {
    background: var(--hover-bg);
}

.swap-btn {
    background: none;
    border: none;
    font-size: 1.25rem;
    cursor: pointer;
    color: var(--text-primary);
    padding: 8px;
    border-radius: 50%;
    transition: transform 0.2s;
}

.swap-btn:hover {
    transform: rotate(180deg);
}

.model-badge {
    position: relative;
    background: var(--card-bg);
    padding: 8px 16px;
    border-radius: 40px;
    cursor: pointer;
    display: flex;
    align-items: center;
    gap: 8px;
    font-size: 0.875rem;
}

.model-dropdown {
    position: absolute;
    top: 100%;
    right: 0;
    background: var(--card-bg);
    backdrop-filter: blur(20px);
    border-radius: 12px;
    padding: 8px;
    display: none;
    flex-direction: column;
    gap: 4px;
    min-width: 160px;
    z-index: 100;
    margin-top: 8px;
}

.model-dropdown.active {
    display: flex;
}

.model-dropdown button {
    background: none;
    border: none;
    padding: 8px 12px;
    cursor: pointer;
    color: var(--text-primary);
    border-radius: 8px;
}

.model-dropdown button:hover {
    background: var(--hover-bg);
}

.settings-btn {
    background: none;
    border: none;
    font-size: 1.25rem;
    cursor: pointer;
    color: var(--text-primary);
    padding: 8px;
    border-radius: 50%;
}

/* Hero Section */
.hero-section {
    flex: 1;
    display: flex;
    align-items: center;
    justify-content: center;
    padding: 40px 24px;
    overflow-y: auto;
}

.hero-glass {
    max-width: 900px;
    width: 100%;
    background: var(--glass-bg);
    backdrop-filter: blur(20px);
    border-radius: 48px;
    padding: 48px 32px;
    border: 1px solid var(--glass-border);
    box-shadow: var(--shadow-lg);
    animation: fadeInUp 0.6s ease;
}

@keyframes fadeInUp {
    from {
        opacity: 0;
        transform: translateY(30px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

.hero-icon {
    text-align: center;
    font-size: 4rem;
    margin-bottom: 16px;
}

.hero-title {
    text-align: center;
    font-size: 2.5rem;
    margin-bottom: 12px;
}

.gradient-text {
    background: linear-gradient(135deg, var(--accent-primary), var(--accent-secondary));
    background-clip: text;
    -webkit-background-clip: text;
    color: transparent;
}

.hero-subtitle {
    text-align: center;
    color: var(--text-secondary);
    margin-bottom: 32px;
}

/* Translate Box */
.translate-box {
    display: flex;
    gap: 20px;
    margin-bottom: 24px;
}

.source-box, .target-box {
    flex: 1;
    background: var(--card-bg);
    backdrop-filter: blur(10px);
    border-radius: 24px;
    padding: 20px;
    border: 1px solid var(--border-color);
}

.source-textarea {
    width: 100%;
    min-height: 150px;
    background: transparent;
    border: none;
    resize: vertical;
    font-size: 1rem;
    line-height: 1.5;
    color: var(--text-primary);
    font-family: inherit;
}

.source-textarea:focus {
    outline: none;
}

.target-content {
    min-height: 150px;
    font-size: 1rem;
    line-height: 1.5;
    color: var(--text-primary);
}

.placeholder-text {
    color: var(--text-secondary);
    opacity: 0.7;
}

.box-tools {
    display: flex;
    justify-content: flex-end;
    gap: 8px;
    margin-top: 12px;
}

.tool-btn {
    background: var(--hover-bg);
    border: none;
    padding: 6px;
    border-radius: 8px;
    cursor: pointer;
    color: var(--text-primary);
    transition: all 0.2s;
}

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

.translate-button {
    display: flex;
    align-items: center;
    justify-content: center;
}

.translate-action {
    background: linear-gradient(135deg, var(--accent-primary), var(--accent-secondary));
    border: none;
    color: white;
    padding: 12px 24px;
    border-radius: 60px;
    cursor: pointer;
    font-size: 1rem;
    display: flex;
    align-items: center;
    gap: 8px;
    transition: transform 0.2s;
}

.translate-action:hover {
    transform: scale(1.05);
}

/* Example Buttons */
.example-buttons {
    display: flex;
    gap: 12px;
    justify-content: center;
    flex-wrap: wrap;
    margin-bottom: 24px;
}

.example-btn {
    background: var(--card-bg);
    border: 1px solid var(--border-color);
    padding: 8px 16px;
    border-radius: 60px;
    font-size: 0.875rem;
    cursor: pointer;
    transition: all 0.2s;
    color: var(--text-primary);
}

.example-btn:hover {
    background: var(--accent-primary);
    color: white;
    border-color: transparent;
}

/* Connection Status */
.connection-status {
    text-align: center;
    font-size: 0.8rem;
    color: var(--text-secondary);
}

.connection-status.connected i {
    color: #10b981;
}

.connection-status.disconnected i {
    color: #ef4444;
}

/* Modal */
.modal {
    display: none;
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: rgba(0, 0, 0, 0.6);
    backdrop-filter: blur(8px);
    z-index: 1000;
    align-items: center;
    justify-content: center;
}

.modal.active {
    display: flex;
}

.glass-modal {
    background: var(--card-bg);
    backdrop-filter: blur(20px);
    border-radius: 32px;
    width: 90%;
    max-width: 500px;
    border: 1px solid var(--glass-border);
}

.modal-header {
    padding: 20px 24px;
    border-bottom: 1px solid var(--border-color);
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.modal-body {
    padding: 24px;
    display: flex;
    flex-direction: column;
    gap: 20px;
}

.modal-body label {
    font-weight: 600;
    font-size: 0.875rem;
}

.modal-body input, .modal-body select {
    padding: 10px 12px;
    border: 1px solid var(--border-color);
    border-radius: 12px;
    background: var(--bg-primary);
    color: var(--text-primary);
}

.modal-body input[type="range"] {
    padding: 0;
}

.modal-footer {
    padding: 20px 24px;
    border-top: 1px solid var(--border-color);
    display: flex;
    justify-content: flex-end;
}

.close-modal {
    background: none;
    border: none;
    font-size: 1.5rem;
    cursor: pointer;
    color: var(--text-secondary);
}

.btn-primary {
    background: linear-gradient(135deg, var(--accent-primary), var(--accent-secondary));
    color: white;
    border: none;
    padding: 10px 24px;
    border-radius: 40px;
    cursor: pointer;
}

/* Typing Indicator */
.typing-indicator {
    display: flex;
    align-items: center;
    gap: 8px;
    padding: 8px 12px;
}

.typing-dot {
    width: 8px;
    height: 8px;
    background: var(--accent-primary);
    border-radius: 50%;
    animation: typing 1.4s infinite;
}

.typing-dot:nth-child(2) { animation-delay: 0.2s; }
.typing-dot:nth-child(3) { animation-delay: 0.4s; }

@keyframes typing {
    0%, 60%, 100% { opacity: 0.3; transform: scale(0.8); }
    30% { opacity: 1; transform: scale(1); }
}

/* Responsive */
@media (max-width: 768px) {
    .sidebar {
        position: fixed;
        left: -280px;
        top: 0;
        bottom: 0;
        z-index: 20;
    }
    
    .sidebar.active {
        left: 0;
    }
    
    .menu-toggle {
        display: block;
    }
    
    .translate-box {
        flex-direction: column;
    }
    
    .hero-glass {
        padding: 32px 20px;
    }
    
    .hero-title {
        font-size: 1.75rem;
    }
    
    .language-selector {
        flex-wrap: wrap;
    }
    
    .top-bar {
        padding: 12px 16px;
    }
}

@media (max-width: 480px) {
    .example-buttons {
        flex-direction: column;
    }
    
    .example-btn {
        width: 100%;
    }
}