:root {
    --primary: #2196F3;
    --secondary: #4CAF50;
    --accent: #FFC107;
    --danger: #F44336;
    --purple: #9C27B0;
    --dark: #1a1a1a;
    --light: #f5f5f5;
    --white: #ffffff;
    --gray: #666666;
    --terminal-green: #00ff41;
    --terminal-dark: #0a0a0a;
    --shadow: 0 2px 10px rgba(0,0,0,0.1);
    --shadow-hover: 0 4px 20px rgba(0,0,0,0.15);
    --border-radius: 12px;
    --transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
}

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

body {
    font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
    background: linear-gradient(135deg, var(--terminal-dark) 0%, #1a1a2e 100%);
    color: var(--white);
    line-height: 1.6;
    min-height: 100vh;
    padding-bottom: 80px;
}

.app-header {
    background: rgba(0, 255, 65, 0.1);
    border-bottom: 2px solid var(--terminal-green);
    padding: 1rem;
    text-align: center;
    backdrop-filter: blur(10px);
    position: sticky;
    top: 0;
    z-index: 100;
}

.app-header h1 {
    font-size: 1.5rem;
    color: var(--terminal-green);
    text-shadow: 0 0 10px var(--terminal-green);
    margin-bottom: 0.5rem;
}

.app-header p {
    color: rgba(255, 255, 255, 0.8);
    font-size: 0.9rem;
}

.app-main {
    padding: 1rem;
    max-width: 1200px;
    margin: 0 auto;
}

.section {
    display: none;
    animation: fadeIn 0.3s ease-in-out;
}

.section.active {
    display: block;
}

@keyframes fadeIn {
    from { opacity: 0; transform: translateY(20px); }
    to { opacity: 1; transform: translateY(0); }
}

.upload-area {
    background: rgba(33, 150, 243, 0.1);
    border: 2px dashed var(--primary);
    border-radius: var(--border-radius);
    padding: 2rem;
    text-align: center;
    margin-bottom: 2rem;
    transition: var(--transition);
    cursor: pointer;
}

.upload-area:hover {
    background: rgba(33, 150, 243, 0.2);
    border-color: var(--terminal-green);
    transform: translateY(-2px);
}

.upload-area.dragover {
    background: rgba(0, 255, 65, 0.2);
    border-color: var(--terminal-green);
    box-shadow: 0 0 20px rgba(0, 255, 65, 0.3);
}

.upload-area i {
    font-size: 3rem;
    color: var(--primary);
    margin-bottom: 1rem;
    display: block;
}

.upload-area h3 {
    margin-bottom: 0.5rem;
    color: var(--white);
}

.upload-area p {
    color: rgba(255, 255, 255, 0.7);
    margin-bottom: 1.5rem;
}

.btn {
    background: var(--primary);
    color: var(--white);
    border: none;
    padding: 0.75rem 1.5rem;
    border-radius: var(--border-radius);
    font-size: 1rem;
    font-weight: 600;
    cursor: pointer;
    transition: var(--transition);
    display: inline-flex;
    align-items: center;
    gap: 0.5rem;
    text-decoration: none;
    justify-content: center;
    box-shadow: var(--shadow);
}

.btn:hover {
    transform: translateY(-2px);
    box-shadow: var(--shadow-hover);
}

.btn:active {
    transform: translateY(0);
}

.btn-primary { background: var(--primary); }
.btn-secondary { background: var(--gray); }
.btn-success { background: var(--secondary); }
.btn-danger { background: var(--danger); }
.btn-small { padding: 0.5rem; font-size: 0.875rem; }

.btn:disabled {
    opacity: 0.5;
    cursor: not-allowed;
    transform: none;
}

.file-info {
    background: rgba(255, 255, 255, 0.1);
    border-radius: var(--border-radius);
    padding: 1rem;
    margin-bottom: 2rem;
}

.file-details {
    display: flex;
    align-items: center;
    gap: 1rem;
}

.file-details i {
    font-size: 2rem;
    color: var(--secondary);
}

.file-details h4 {
    margin-bottom: 0.25rem;
}

.file-details p {
    color: rgba(255, 255, 255, 0.7);
    font-size: 0.875rem;
}

.templates-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: 1.5rem;
    margin-bottom: 2rem;
}

.template-card {
    background: rgba(255, 255, 255, 0.1);
    border-radius: var(--border-radius);
    padding: 1.5rem;
    text-align: center;
    transition: var(--transition);
    border: 2px solid transparent;
}

.template-card:hover {
    transform: translateY(-5px);
    box-shadow: var(--shadow-hover);
    border-color: var(--terminal-green);
}

.template-card.selected {
    border-color: var(--terminal-green);
    background: rgba(0, 255, 65, 0.1);
}

.template-preview {
    width: 80px;
    height: 80px;
    background: rgba(33, 150, 243, 0.2);
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    margin: 0 auto 1rem;
}

.template-preview i {
    font-size: 2rem;
    color: var(--primary);
}

.template-card h3 {
    margin-bottom: 0.5rem;
    color: var(--white);
}

.template-card p {
    color: rgba(255, 255, 255, 0.7);
    margin-bottom: 1rem;
    font-size: 0.875rem;
}

.selected-template {
    background: rgba(0, 255, 65, 0.1);
    border: 2px solid var(--terminal-green);
    border-radius: var(--border-radius);
    padding: 1.5rem;
    text-align: center;
}

.template-info {
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 1rem;
}

.template-info span {
    font-weight: 600;
    color: var(--terminal-green);
}

.preview-container {
    background: rgba(255, 255, 255, 0.1);
    border-radius: var(--border-radius);
    padding: 1.5rem;
    text-align: center;
}

#previewCanvas {
    max-width: 100%;
    height: auto;
    border: 2px solid var(--terminal-green);
    border-radius: var(--border-radius);
    margin-bottom: 1rem;
    background: var(--white);
}

.preview-controls {
    display: flex;
    gap: 1rem;
    justify-content: center;
    flex-wrap: wrap;
}

.branding-controls {
    background: rgba(255, 255, 255, 0.1);
    border-radius: var(--border-radius);
    padding: 1.5rem;
}

.color-section, .logo-section, .preset-section {
    margin-bottom: 2rem;
}

.color-section h3, .logo-section h3, .preset-section h3 {
    margin-bottom: 1rem;
    color: var(--terminal-green);
}

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

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

.color-option label {
    font-size: 0.875rem;
    color: rgba(255, 255, 255, 0.8);
}

.color-option input[type="color"] {
    width: 100%;
    height: 50px;
    border: none;
    border-radius: var(--border-radius);
    cursor: pointer;
}

.logo-upload {
    display: flex;
    flex-direction: column;
    gap: 1rem;
    align-items: flex-start;
}

.logo-preview {
    display: flex;
    align-items: center;
    gap: 1rem;
    padding: 1rem;
    background: rgba(255, 255, 255, 0.1);
    border-radius: var(--border-radius);
}

.logo-preview img {
    max-width: 100px;
    max-height: 60px;
    border-radius: 4px;
}

.preset-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(120px, 1fr));
    gap: 1rem;
}

.preset-btn {
    background: rgba(255, 255, 255, 0.1);
    border: 2px solid transparent;
    border-radius: var(--border-radius);
    padding: 1rem;
    cursor: pointer;
    transition: var(--transition);
    color: var(--white);
    font-size: 0.875rem;
}

.preset-btn:hover {
    border-color: var(--terminal-green);
    transform: translateY(-2px);
}

.preset-colors {
    display: flex;
    justify-content: center;
    gap: 4px;
    margin-bottom: 0.5rem;
}

.preset-colors span {
    width: 20px;
    height: 20px;
    border-radius: 50%;
}

.faq-section {
    margin-top: 3rem;
    padding-top: 2rem;
    border-top: 2px solid rgba(0, 255, 65, 0.3);
}

.faq-section h2 {
    text-align: center;
    margin-bottom: 2rem;
    color: var(--terminal-green);
}

.faq-container {
    max-width: 800px;
    margin: 0 auto;
}

.faq-item {
    background: rgba(255, 255, 255, 0.1);
    border-radius: var(--border-radius);
    margin-bottom: 1rem;
    overflow: hidden;
    border: 1px solid rgba(0, 255, 65, 0.2);
}

.faq-question {
    width: 100%;
    background: none;
    border: none;
    color: var(--white);
    padding: 1.5rem;
    text-align: left;
    cursor: pointer;
    display: flex;
    justify-content: space-between;
    align-items: center;
    font-size: 1rem;
    font-weight: 600;
    transition: var(--transition);
}

.faq-question:hover {
    background: rgba(0, 255, 65, 0.1);
}

.faq-question[aria-expanded="true"] {
    background: rgba(0, 255, 65, 0.1);
}

.faq-question[aria-expanded="true"] .faq-icon {
    transform: rotate(45deg);
}

.faq-icon {
    font-size: 1.2rem;
    color: var(--terminal-green);
    transition: var(--transition);
}

.faq-answer {
    padding: 0 1.5rem 1.5rem;
    color: rgba(255, 255, 255, 0.8);
    line-height: 1.6;
}

.faq-answer[hidden] {
    display: none;
}

.bottom-nav {
    position: fixed;
    bottom: 0;
    left: 0;
    right: 0;
    background: rgba(26, 26, 26, 0.95);
    backdrop-filter: blur(10px);
    border-top: 2px solid var(--terminal-green);
    display: flex;
    justify-content: space-around;
    padding: 0.5rem 0;
    z-index: 1000;
}

.nav-item {
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 0.25rem;
    color: rgba(255, 255, 255, 0.6);
    text-decoration: none;
    padding: 0.5rem;
    border-radius: 8px;
    transition: var(--transition);
    min-width: 60px;
}

.nav-item:hover {
    color: var(--terminal-green);
    background: rgba(0, 255, 65, 0.1);
}

.nav-item.active {
    color: var(--terminal-green);
    background: rgba(0, 255, 65, 0.2);
}

.nav-item i {
    font-size: 1.2rem;
}

.nav-item span {
    font-size: 0.75rem;
    font-weight: 500;
}

footer {
    background: var(--terminal-dark);
    color: rgba(255, 255, 255, 0.6);
    text-align: center;
    padding: 1rem;
    font-size: 0.875rem;
    border-top: 1px solid rgba(0, 255, 65, 0.2);
    margin-top: 3rem;
}

@media (max-width: 768px) {
    .app-header h1 {
        font-size: 1.25rem;
    }
    
    .templates-grid {
        grid-template-columns: 1fr;
    }
    
    .color-grid {
        grid-template-columns: 1fr;
    }
    
    .preset-grid {
        grid-template-columns: repeat(3, 1fr);
    }
    
    .preview-controls {
        flex-direction: column;
    }
    
    .template-info {
        flex-direction: column;
        text-align: center;
    }
    
    .btn {
        width: 100%;
    }
}

@media (max-width: 480px) {
    .app-main {
        padding: 0.5rem;
    }
    
    .upload-area {
        padding: 1.5rem;
    }
    
    .template-card, .branding-controls {
        padding: 1rem;
    }
    
    .faq-question {
        padding: 1rem;
        font-size: 0.9rem;
    }
    
    .nav-item span {
        font-size: 0.7rem;
    }
}

.loading {
    display: inline-block;
    width: 20px;
    height: 20px;
    border: 3px solid rgba(255,255,255,.3);
    border-radius: 50%;
    border-top-color: var(--terminal-green);
    animation: spin 1s ease-in-out infinite;
}

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

.success-message {
    background: rgba(76, 175, 80, 0.2);
    border: 1px solid var(--secondary);
    color: var(--secondary);
    padding: 1rem;
    border-radius: var(--border-radius);
    margin: 1rem 0;
    text-align: center;
}

.error-message {
    background: rgba(244, 67, 54, 0.2);
    border: 1px solid var(--danger);
    color: var(--danger);
    padding: 1rem;
    border-radius: var(--border-radius);
    margin: 1rem 0;
    text-align: center;
}