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

body {
    font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
    background: linear-gradient(135deg, #1e3a8a 0%, #374151 100%);
    min-height: 100vh;
    color: #1f2937;
}

.container {
    max-width: 800px;
    margin: 0 auto;
    padding: 20px;
}

.header {
    text-align: center;
    background: white;
    padding: 30px;
    border-radius: 15px;
    box-shadow: 0 10px 30px rgba(0,0,0,0.1);
    margin-bottom: 30px;
}

.header h1 {
    color: #1e40af;
    font-size: 2.5rem;
    margin-bottom: 10px;
    font-weight: 700;
}

.header p {
    color: #4b5563;
    font-size: 1.1rem;
}

.main-content {
    background: white;
    padding: 40px;
    border-radius: 15px;
    box-shadow: 0 10px 30px rgba(0,0,0,0.1);
}

.qr-form {
    display: grid;
    gap: 25px;
}

.form-group {
    display: flex;
    flex-direction: column;
}

.form-group label {
    font-weight: 600;
    color: #374151;
    margin-bottom: 8px;
    font-size: 1rem;
}

.form-group input,
.form-group select,
.form-group textarea {
    padding: 12px 15px;
    border: 2px solid #d1d5db;
    border-radius: 8px;
    font-size: 1rem;
    transition: all 0.3s ease;
    background: #ffffff;
}

.form-group input:focus,
.form-group select:focus,
.form-group textarea:focus {
    outline: none;
    border-color: #1e40af;
    box-shadow: 0 0 0 3px rgba(30, 64, 175, 0.1);
}

.form-group textarea {
    resize: vertical;
    min-height: 100px;
}

.file-input-wrapper {
    position: relative;
}

.file-input-wrapper input[type="file"] {
    position: absolute;
    opacity: 0;
    width: 100%;
    height: 100%;
    cursor: pointer;
}

.file-input-label {
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 10px;
    padding: 12px 15px;
    border: 2px dashed #9ca3af;
    border-radius: 8px;
    background: #f9fafb;
    color: #374151;
    cursor: pointer;
    transition: all 0.3s ease;
}

.file-input-label:hover {
    border-color: #1e40af;
    background: #f3f4f6;
}

.logo-preview {
    margin-top: 15px;
    text-align: center;
}

.logo-preview img {
    max-width: 100px;
    max-height: 100px;
    border-radius: 8px;
    box-shadow: 0 4px 12px rgba(0,0,0,0.1);
}

.generate-btn {
    background: linear-gradient(135deg, #1e40af 0%, #1e3a8a 100%);
    color: white;
    border: none;
    padding: 15px 30px;
    border-radius: 8px;
    font-size: 1.1rem;
    font-weight: 600;
    cursor: pointer;
    transition: all 0.3s ease;
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 10px;
}

.generate-btn:hover {
    background: linear-gradient(135deg, #1d4ed8 0%, #1e40af 100%);
    transform: translateY(-2px);
    box-shadow: 0 8px 25px rgba(30, 64, 175, 0.3);
}

.loading {
    text-align: center;
    padding: 40px;
    color: #1e40af;
}

.loading i {
    font-size: 3rem;
    margin-bottom: 15px;
}

.loading p {
    font-size: 1.2rem;
    font-weight: 500;
}

.result {
    text-align: center;
    padding: 30px;
}

.result h3 {
    color: #059669;
    font-size: 1.5rem;
    margin-bottom: 25px;
    font-weight: 600;
}

.qr-actions {
    display: flex;
    gap: 15px;
    justify-content: center;
    margin-bottom: 25px;
    flex-wrap: wrap;
}

.download-btn {
    background: #047857;
    color: white;
    border: none;
    padding: 12px 20px;
    border-radius: 8px;
    font-size: 1rem;
    font-weight: 500;
    cursor: pointer;
    transition: all 0.3s ease;
    display: flex;
    align-items: center;
    gap: 8px;
}

.download-btn:hover {
    background: #065f46;
    transform: translateY(-1px);
    box-shadow: 0 4px 12px rgba(4, 120, 87, 0.3);
}

.qr-preview {
    display: flex;
    justify-content: center;
    gap: 20px;
    flex-wrap: wrap;
}

.qr-preview img {
    border-radius: 8px;
    box-shadow: 0 8px 25px rgba(0,0,0,0.1);
    max-width: 100%;
    height: auto;
}

.hidden {
    display: none !important;
}

.footer {
    text-align: center;
    margin-top: 30px;
    padding: 20px;
    color: rgba(255, 255, 255, 0.9);
    font-size: 0.9rem;
    font-weight: 500;
}

/* Estilos adicionales para look institucional */
.header {
    border-top: 4px solid #1e40af;
}

.main-content {
    border: 1px solid #e5e7eb;
}

.qr-preview img {
    border: 2px solid #e5e7eb;
}

/* Mejoras en la tipografía */
h1, h2, h3 {
    letter-spacing: -0.025em;
}

.form-group label {
    text-transform: uppercase;
    font-size: 0.875rem;
    letter-spacing: 0.05em;
}

@media (max-width: 768px) {
    .container {
        padding: 15px;
    }
    
    .header h1 {
        font-size: 2rem;
    }
    
    .main-content {
        padding: 25px;
    }
    
    .qr-actions {
        flex-direction: column;
        align-items: center;
    }
    
    .download-btn {
        width: 200px;
        justify-content: center;
    }
}