/* Optimized styles for Veo 3 Prompt Generator - No Lag Version */
@import url('https://fonts.googleapis.com/css2?family=Inter:wght@300;400;500;600;700&display=swap');

:root {
    --primary-color: #667eea;
    --secondary-color: #8b5cf6;
    --success-color: #10b981;
    --error-color: #ef4444;
    --warning-color: #f59e0b;
    --border-radius: 0.75rem;
    --transition: all 0.2s ease;
}

* {
    box-sizing: border-box;
}

body {
    font-family: 'Inter', sans-serif;
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    min-height: 100vh;
    margin: 0;
    padding: 0;
}

/* Main container - simplified */
.main-content-box {
    max-height: calc(100vh - 4rem);
    overflow-y: auto;
    background: rgba(255, 255, 255, 0.95);
    border-radius: 1.5rem;
    box-shadow: 0 10px 25px rgba(0, 0, 0, 0.15);
    transition: var(--transition);
}

.main-content-box:hover {
    transform: translateY(-2px);
    box-shadow: 0 15px 35px rgba(0, 0, 0, 0.2);
}

/* Custom scrollbar */
.main-content-box::-webkit-scrollbar {
    width: 6px;
}

.main-content-box::-webkit-scrollbar-track {
    background: #f1f5f9;
    border-radius: 10px;
}

.main-content-box::-webkit-scrollbar-thumb {
    background: var(--secondary-color);
    border-radius: 10px;
}

/* Title styling - simplified */
h1 {
    background: linear-gradient(135deg, var(--primary-color), #764ba2);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
    font-weight: 700;
    position: relative;
}

h1::after {
    content: '';
    position: absolute;
    bottom: -8px;
    left: 50%;
    transform: translateX(-50%);
    width: 60px;
    height: 3px;
    background: var(--primary-color);
    border-radius: 2px;
}

/* Info banner */
.info-banner {
    background: rgba(59, 130, 246, 0.1);
    border: 1px solid rgba(59, 130, 246, 0.2);
    border-radius: var(--border-radius);
    padding: 1rem;
    display: flex;
    align-items: flex-start;
    gap: 0.5rem;
    margin-bottom: 1.5rem;
}

.info-banner i {
    color: #3b82f6;
    margin-top: 0.2rem;
    flex-shrink: 0;
}

/* Tab system - updated for 5 tabs */
.tab-buttons {
    display: flex;
    justify-content: center;
    margin-bottom: 2rem;
    padding: 0.5rem;
    background: rgba(255, 255, 255, 0.2);
    border-radius: 1rem;
    gap: 0.25rem;
    flex-wrap: wrap;
}

.tab-button {
    padding: 0.75rem 1rem;
    border-radius: 0.75rem;
    font-weight: 600;
    cursor: pointer;
    transition: var(--transition);
    background: transparent;
    color: #6b7280;
    border: none;
    display: flex;
    align-items: center;
    gap: 0.5rem;
    font-size: 0.875rem;
    min-width: 120px;
    justify-content: center;
}

.tab-button.active {
    background: var(--primary-color);
    color: white;
    box-shadow: 0 4px 12px rgba(102, 126, 234, 0.3);
}

.tab-button:hover:not(.active) {
    background: rgba(255, 255, 255, 0.15);
    color: #4b5563;
}

.tab-content {
    animation: fadeIn 0.3s ease;
}

@keyframes fadeIn {
    from { opacity: 0; }
    to { opacity: 1; }
}

.tab-content.hidden {
    display: none;
}

/* Input styling - optimized */
.input-group {
    margin-bottom: 1.5rem;
    position: relative;
}

.input-group label {
    display: flex;
    align-items: center;
    font-weight: 600;
    margin-bottom: 0.75rem;
    color: #374151;
    gap: 0.5rem;
}

.input-group label i {
    color: var(--secondary-color);
}

.input-group textarea,
.input-group input[type="text"] {
    width: 100%;
    padding: 1rem;
    border: 2px solid #e5e7eb;
    border-radius: var(--border-radius);
    font-size: 1rem;
    background: white;
    transition: var(--transition);
    font-family: inherit;
    line-height: 1.5;
    resize: vertical;
}

.input-group textarea {
    min-height: 100px;
}

.input-group textarea:focus,
.input-group input[type="text"]:focus {
    outline: none;
    border-color: var(--secondary-color);
    box-shadow: 0 0 0 3px rgba(139, 92, 246, 0.1);
}

.input-group textarea::placeholder,
.input-group input[type="text"]::placeholder {
    color: #9ca3af;
    font-style: italic;
}

/* Suggestion buttons - simplified */
.suggestion-button {
    position: absolute;
    top: 0;
    right: 0;
    margin-top: 0.5rem;
    margin-right: 0.5rem;
    padding: 0.5rem 1rem;
    background: var(--secondary-color);
    color: white;
    border: none;
    border-radius: 0.5rem;
    font-size: 0.875rem;
    font-weight: 500;
    cursor: pointer;
    transition: var(--transition);
    display: flex;
    align-items: center;
    gap: 0.25rem;
    z-index: 5;
}

.suggestion-button:hover {
    background: #7c3aed;
    transform: translateY(-1px);
}

.suggestion-button:disabled {
    background: #9ca3af;
    cursor: not-allowed;
    transform: none;
}

.expand-button {
    background: var(--success-color) !important;
}

.expand-button:hover {
    background: #059669 !important;
}

/* Main buttons - simplified */
.generate-btn, .add-character-btn, .copy-btn, .edit-btn, .convert-btn, .contact-btn {
    background: var(--primary-color) !important;
    color: white !important;
    border: none !important;
    transition: var(--transition) !important;
    display: flex !important;
    align-items: center !important;
    justify-content: center !important;
    gap: 0.5rem !important;
    font-weight: 600 !important;
    cursor: pointer !important;
}

.generate-btn:hover, .add-character-btn:hover, .copy-btn:hover,
.edit-btn:hover, .convert-btn:hover, .contact-btn:hover {
    transform: translateY(-1px) !important;
    box-shadow: 0 8px 16px rgba(0, 0, 0, 0.15) !important;
}

/* Specific button colors */
.add-character-btn {
    background: var(--secondary-color) !important;
}

.copy-btn {
    background: var(--success-color) !important;
}

.edit-btn {
    background: var(--warning-color) !important;
}

.convert-btn {
    background: var(--secondary-color) !important;
}

/* Character block styling */
.character-block {
    border: 2px solid #e5e7eb;
    padding: 1.5rem;
    border-radius: var(--border-radius);
    margin-bottom: 1.5rem;
    background: rgba(255, 255, 255, 0.8);
    position: relative;
    transition: var(--transition);
}

.character-block::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    height: 3px;
    background: var(--primary-color);
    border-radius: var(--border-radius) var(--border-radius) 0 0;
}

.character-block:hover {
    border-color: var(--secondary-color);
    box-shadow: 0 4px 12px rgba(0, 0, 0, 0.1);
}

.character-block-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 1rem;
    padding-bottom: 1rem;
    border-bottom: 1px solid #e5e7eb;
}

.character-block-header h3 {
    color: var(--primary-color);
    font-weight: 600;
    display: flex;
    align-items: center;
    gap: 0.5rem;
    margin: 0;
}

.remove-character-button {
    background: var(--error-color);
    color: white;
    padding: 0.5rem 1rem;
    border-radius: 0.5rem;
    font-size: 0.875rem;
    font-weight: 500;
    cursor: pointer;
    border: none;
    transition: var(--transition);
    display: flex;
    align-items: center;
    gap: 0.5rem;
}

.remove-character-button:hover {
    background: #dc2626;
    transform: translateY(-1px);
}

/* Result containers */
.result-container {
    background: #f9fafb;
    border: 2px solid #e5e7eb;
    border-radius: var(--border-radius);
    transition: var(--transition);
    position: relative;
}

.result-container::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    height: 3px;
    background: var(--success-color);
    border-radius: var(--border-radius) var(--border-radius) 0 0;
}

.result-container:hover {
    box-shadow: 0 4px 12px rgba(0, 0, 0, 0.1);
}

.result-container h2 {
    font-weight: 600;
    color: var(--success-color);
    margin-bottom: 1rem;
    display: flex;
    align-items: center;
    gap: 0.5rem;
}

.prompt-content {
    background: #f3f4f6;
    padding: 1rem;
    border-radius: 0.5rem;
    font-family: 'Courier New', monospace;
    white-space: pre-wrap;
    word-wrap: break-word;
    font-size: 0.875rem;
    color: #374151;
    line-height: 1.5;
    border: 1px solid #d1d5db;
}

/* Converted prompt scenes */
.converted-prompt-scene {
    border: 2px solid #e5e7eb;
    background: #f9fafb;
    padding: 1rem;
    border-radius: var(--border-radius);
    margin-bottom: 1rem;
    transition: var(--transition);
    position: relative;
}

.converted-prompt-scene::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    height: 3px;
    background: var(--success-color);
    border-radius: var(--border-radius) var(--border-radius) 0 0;
}

.converted-prompt-scene:hover {
    box-shadow: 0 4px 12px rgba(0, 0, 0, 0.1);
}

.converted-prompt-scene h3 {
    font-weight: 600;
    color: var(--success-color);
    margin-bottom: 0.75rem;
}

/* Loading states */
.loading-main {
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 1rem;
    padding: 2rem;
}

.loading-spinner i {
    animation: spin 1s linear infinite;
}

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

.loading-indicator {
    color: #3b82f6 !important;
    font-weight: 500;
    display: flex;
    align-items: center;
    gap: 0.5rem;
    margin-top: 0.5rem;
    padding: 0.5rem;
    background: rgba(59, 130, 246, 0.1);
    border-radius: 0.5rem;
    border: 1px solid rgba(59, 130, 246, 0.2);
}

.loading-indicator i {
    animation: spin 1s linear infinite;
}

/* Message styling */
.success-message {
    color: var(--success-color) !important;
    background: rgba(16, 185, 129, 0.1);
    border: 1px solid rgba(16, 185, 129, 0.2);
    padding: 0.75rem;
    border-radius: 0.5rem;
    font-weight: 600;
    display: flex;
    align-items: center;
    gap: 0.5rem;
}

.error-message {
    color: var(--error-color) !important;
    background: rgba(239, 68, 68, 0.1);
    border: 1px solid rgba(239, 68, 68, 0.2);
    padding: 0.75rem;
    border-radius: 0.5rem;
    font-weight: 600;
    display: flex;
    align-items: center;
    gap: 0.5rem;
}

/* Button groups */
.button-group {
    display: flex;
    gap: 1rem;
    flex-wrap: wrap;
}

.button-group button {
    flex: 1;
    min-width: 150px;
}

/* Donation notice */
.donation-notice {
    background: linear-gradient(135deg, rgba(251, 191, 36, 0.1), rgba(245, 158, 11, 0.1));
    border: 1px solid rgba(251, 191, 36, 0.3);
    border-radius: var(--border-radius);
}

.bank-info {
    background: white;
    display: flex;
    flex-direction: column;
    gap: 0.5rem;
    transition: var(--transition);
}

.bank-info:hover {
    transform: translateY(-1px);
    box-shadow: 0 4px 8px rgba(0, 0, 0, 0.1);
}

/* Contact and instruction sections */
.contact-info,
.instructions {
    background: rgba(255, 255, 255, 0.8);
    border-radius: var(--border-radius);
    padding: 1.5rem;
    border: 1px solid #e5e7eb;
}

.contact-info h2,
.instructions h2 {
    color: var(--primary-color);
    display: flex;
    align-items: center;
    gap: 0.5rem;
}

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

.instruction-item {
    transition: var(--transition);
}

.instruction-item:hover {
    transform: translateY(-1px);
    box-shadow: 0 4px 8px rgba(0, 0, 0, 0.1);
}

.instruction-item h3 {
    display: flex;
    align-items: center;
    gap: 0.5rem;
}

/* NEW STYLES FOR ADDITIONAL TABS */

/* Guide content styles */
.guide-content {
    max-width: 100%;
}

.section-title {
    font-size: 1.5rem;
    font-weight: 700;
    color: var(--primary-color);
    margin-bottom: 1.5rem;
    display: flex;
    align-items: center;
    gap: 0.5rem;
}

.tip-card, .formula-card {
    background: white;
    border: 2px solid #e5e7eb;
    border-radius: var(--border-radius);
    padding: 1.5rem;
    margin-bottom: 1.5rem;
    box-shadow: 0 2px 8px rgba(0, 0, 0, 0.05);
    transition: var(--transition);
}

.tip-card:hover, .formula-card:hover {
    border-color: var(--secondary-color);
    box-shadow: 0 4px 12px rgba(0, 0, 0, 0.1);
}

.tip-header, .formula-header {
    color: var(--primary-color);
    font-size: 1.1rem;
    margin-bottom: 1rem;
    display: flex;
    align-items: center;
    gap: 0.5rem;
}

.tip-list {
    list-style: none;
    padding-left: 0;
    margin: 1rem 0;
}

.tip-list li {
    padding: 0.5rem 0;
    padding-left: 1.5rem;
    position: relative;
}

.tip-list li::before {
    content: "✓";
    position: absolute;
    left: 0;
    color: var(--success-color);
    font-weight: bold;
}

.example-box, .formula-example {
    background: #f0f9ff;
    border: 1px solid #bae6fd;
    border-radius: 0.5rem;
    padding: 1rem;
    margin-top: 1rem;
    font-style: italic;
}

.note-box, .warning-box {
    background: #fef3c7;
    border: 1px solid #fbbf24;
    border-radius: 0.5rem;
    padding: 1rem;
    margin-top: 1rem;
}

.warning-box {
    background: #fee2e2;
    border-color: #f87171;
}

.conclusion-box {
    background: linear-gradient(135deg, rgba(16, 185, 129, 0.1), rgba(34, 197, 94, 0.1));
    border: 2px solid var(--success-color);
    border-radius: var(--border-radius);
    padding: 1.5rem;
    text-align: center;
    margin-top: 2rem;
    font-size: 1.1rem;
}

.full-example-card {
    background: linear-gradient(135deg, rgba(59, 130, 246, 0.05), rgba(147, 51, 234, 0.05));
    border: 2px solid var(--secondary-color);
    border-radius: var(--border-radius);
    padding: 1.5rem;
    margin: 2rem 0;
}

.full-example-header {
    color: var(--secondary-color);
    font-size: 1.2rem;
    font-weight: 700;
    margin-bottom: 1rem;
    display: flex;
    align-items: center;
    gap: 0.5rem;
}

.full-example-content {
    background: white;
    border-radius: 0.5rem;
    padding: 1.5rem;
    font-family: 'Courier New', monospace;
    line-height: 1.6;
    border: 1px solid #d1d5db;
}

.additional-tips {
    margin-top: 2rem;
    padding-top: 2rem;
    border-top: 2px solid #e5e7eb;
}

.tips-title {
    font-size: 1.3rem;
    font-weight: 700;
    color: var(--warning-color);
    margin-bottom: 1.5rem;
    display: flex;
    align-items: center;
    gap: 0.5rem;
}

.tip-item {
    background: #fffbeb;
    border: 1px solid #fed7aa;
    border-radius: 0.5rem;
    padding: 1rem;
    margin-bottom: 1rem;
}

.tip-item strong {
    color: var(--warning-color);
    display: block;
    margin-bottom: 0.5rem;
}

/* Prompt samples styles */
.samples-header .zalo-link-box {
    text-align: center;
    margin-top: 1rem;
}

.zalo-link {
    display: inline-flex;
    align-items: center;
    gap: 0.5rem;
    background: linear-gradient(135deg, #0084ff, #00c6ff);
    color: white;
    padding: 0.75rem 1.5rem;
    border-radius: 0.75rem;
    text-decoration: none;
    font-weight: 600;
    transition: var(--transition);
    box-shadow: 0 4px 12px rgba(0, 132, 255, 0.3);
}

.zalo-link:hover {
    transform: translateY(-1px);
    box-shadow: 0 6px 16px rgba(0, 132, 255, 0.4);
    color: white;
    text-decoration: none;
}

.sample-search-box {
    max-width: 500px;
    margin: 0 auto;
}

.search-input-group {
    position: relative;
    display: flex;
    align-items: center;
}

.search-input-group i {
    position: absolute;
    left: 1rem;
    color: #9ca3af;
    z-index: 5;
}

.search-input-group input {
    width: 100%;
    padding: 1rem 1rem 1rem 2.5rem;
    border: 2px solid #e5e7eb;
    border-radius: var(--border-radius);
    font-size: 1rem;
    background: white;
    transition: var(--transition);
}

.search-input-group input:focus {
    outline: none;
    border-color: var(--secondary-color);
    box-shadow: 0 0 0 3px rgba(139, 92, 246, 0.1);
}

.samples-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(350px, 1fr));
    gap: 1.5rem;
    margin-top: 1.5rem;
}

.sample-card {
    background: white;
    border: 2px solid #e5e7eb;
    border-radius: var(--border-radius);
    padding: 1.5rem;
    transition: var(--transition);
    position: relative;
    overflow: hidden;
}

.sample-card:hover {
    border-color: var(--success-color);
    box-shadow: 0 8px 20px rgba(0, 0, 0, 0.1);
    transform: translateY(-2px);
}

.sample-card::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    height: 4px;
    background: linear-gradient(135deg, var(--success-color), #34d399);
}

.sample-header {
    display: flex;
    justify-content: space-between;
    align-items: flex-start;
    margin-bottom: 1rem;
}

.sample-number {
    background: var(--success-color);
    color: white;
    font-weight: 700;
    font-size: 0.875rem;
    padding: 0.25rem 0.75rem;
    border-radius: 1rem;
    min-width: 40px;
    text-align: center;
}

.sample-title {
    font-weight: 600;
    color: #374151;
    font-size: 1rem;
    line-height: 1.4;
    flex: 1;
    margin-left: 1rem;
}

.sample-content {
    background: #f9fafb;
    border: 1px solid #e5e7eb;
    border-radius: 0.5rem;
    padding: 1rem;
    margin: 1rem 0;
    font-family: 'Courier New', monospace;
    font-size: 0.875rem;
    line-height: 1.5;
    max-height: 200px;
    overflow-y: auto;
    color: #374151;
}

.sample-actions {
    display: flex;
    gap: 0.5rem;
    margin-top: 1rem;
}

.copy-sample-btn {
    background: var(--secondary-color);
    color: white;
    border: none;
    padding: 0.5rem 1rem;
    border-radius: 0.5rem;
    font-size: 0.875rem;
    font-weight: 500;
    cursor: pointer;
    transition: var(--transition);
    display: flex;
    align-items: center;
    gap: 0.25rem;
    flex: 1;
    justify-content: center;
}

.copy-sample-btn:hover {
    background: #7c3aed;
    transform: translateY(-1px);
}

.use-sample-btn {
    background: var(--success-color);
    color: white;
    border: none;
    padding: 0.5rem 1rem;
    border-radius: 0.5rem;
    font-size: 0.875rem;
    font-weight: 500;
    cursor: pointer;
    transition: var(--transition);
    display: flex;
    align-items: center;
    gap: 0.25rem;
    flex: 1;
    justify-content: center;
}

.use-sample-btn:hover {
    background: #059669;
    transform: translateY(-1px);
}

.load-more-container {
    margin-top: 2rem;
    padding-top: 2rem;
    border-top: 1px solid #e5e7eb;
}

.load-more-btn {
    background: linear-gradient(135deg, var(--primary-color), var(--secondary-color));
    color: white;
    border: none;
    padding: 1rem 2rem;
    border-radius: var(--border-radius);
    font-size: 1rem;
    font-weight: 600;
    cursor: pointer;
    transition: var(--transition);
    display: flex;
    align-items: center;
    gap: 0.5rem;
    margin: 0 auto;
}

.load-more-btn:hover {
    transform: translateY(-2px);
    box-shadow: 0 8px 16px rgba(0, 0, 0, 0.15);
}

.sample-tag {
    display: inline-block;
    background: rgba(59, 130, 246, 0.1);
    color: #3b82f6;
    font-size: 0.75rem;
    padding: 0.25rem 0.5rem;
    border-radius: 0.25rem;
    margin: 0.25rem 0.25rem 0.25rem 0;
    font-weight: 500;
}

/* Mobile responsiveness */
@media (max-width: 768px) {
    .main-content-box {
        margin: 1rem;
        padding: 1rem;
        max-height: calc(100vh - 2rem);
    }
    
    .tab-buttons {
        flex-direction: column;
        gap: 0.5rem;
    }
    
    .tab-button {
        width: 100%;
        justify-content: center;
        padding: 0.5rem 0.75rem;
        font-size: 0.8rem;
        min-width: 100px;
    }
    
    .character-block-header {
        flex-direction: column;
        gap: 1rem;
        align-items: flex-start;
    }
    
    .suggestion-button {
        position: static;
        margin: 0.5rem 0 0 0;
        width: 100%;
        justify-content: center;
    }
    
    .button-group {
        flex-direction: column;
    }
    
    .instruction-grid {
        grid-template-columns: 1fr;
    }
    
    h1 {
        font-size: 1.75rem;
    }
    
    .samples-grid {
        grid-template-columns: 1fr;
        gap: 1rem;
    }
    
    .sample-header {
        flex-direction: column;
        gap: 0.5rem;
    }
    
    .sample-title {
        margin-left: 0;
    }
    
    .sample-actions {
        flex-direction: column;
    }
    
    .tip-card, .formula-card {
        padding: 1rem;
    }
    
    .section-title {
        font-size: 1.25rem;
    }
}

@media (max-width: 480px) {
    .main-content-box {
        padding: 0.75rem;
    }
    
    .character-block {
        padding: 1rem;
    }
    
    .input-group textarea,
    .input-group input[type="text"] {
        padding: 0.75rem;
    }
    
    .tab-button {
        padding: 0.75rem 1rem;
        font-size: 0.875rem;
    }
    
    .full-example-content {
        padding: 1rem;
        font-size: 0.8rem;
    }
}

/* Hide complex animations on low-end devices */
@media (prefers-reduced-motion: reduce) {
    * {
        animation-duration: 0.01ms !important;
        animation-iteration-count: 1 !important;
        transition-duration: 0.01ms !important;
    }
}