/* ===============================================
   Reset y Base
   =============================================== */
* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

:root {
    --primary-color: #3b82f6;
    --primary-hover: #2563eb;
    --primary-light: #dbeafe;
    --secondary-color: #64748b;
    --success-color: #10b981;
    --error-color: #ef4444;
    --warning-color: #f59e0b;
    
    --bg-primary: #ffffff;
    --bg-secondary: #f8fafc;
    --bg-tertiary: #f1f5f9;
    
    --text-primary: #0f172a;
    --text-secondary: #475569;
    --text-tertiary: #94a3b8;
    
    --border-color: #e2e8f0;
    --shadow-sm: 0 1px 2px 0 rgba(0, 0, 0, 0.05);
    --shadow-md: 0 4px 6px -1px rgba(0, 0, 0, 0.1);
    --shadow-lg: 0 10px 15px -3px rgba(0, 0, 0, 0.1);
    --shadow-xl: 0 20px 25px -5px rgba(0, 0, 0, 0.1);
    
    --radius-sm: 0.375rem;
    --radius-md: 0.5rem;
    --radius-lg: 0.75rem;
    --radius-xl: 1rem;
    
    --transition: all 0.3s ease;
}

body {
    font-family: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;
    color: var(--text-primary);
    background-color: var(--bg-secondary);
    line-height: 1.6;
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
}

.container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 1.5rem;
}

/* ===============================================
   Header
   =============================================== */
.header {
    background-color: var(--bg-primary);
    border-bottom: 1px solid var(--border-color);
    padding: 1rem 0;
    position: sticky;
    top: 0;
    z-index: 100;
    box-shadow: var(--shadow-sm);
}

.header-content {
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.logo {
    display: flex;
    align-items: center;
    gap: 0.75rem;
    font-size: 1.5rem;
    font-weight: 700;
    color: var(--primary-color);
}

.logo svg {
    color: var(--primary-color);
}

.nav {
    display: flex;
    gap: 2rem;
}

.nav-link {
    color: var(--text-secondary);
    text-decoration: none;
    font-weight: 500;
    transition: var(--transition);
}

.nav-link:hover {
    color: var(--primary-color);
}

/* ===============================================
   Hero Section
   =============================================== */
.hero {
    padding: 4rem 0 2rem;
    text-align: center;
}

.hero-title {
    font-size: 3rem;
    font-weight: 700;
    color: var(--text-primary);
    margin-bottom: 1rem;
    line-height: 1.2;
}

.hero-subtitle {
    font-size: 1.25rem;
    color: var(--text-secondary);
    max-width: 600px;
    margin: 0 auto;
}

/* ===============================================
   Compressor Section
   =============================================== */
.compressor-section {
    padding: 2rem 0 4rem;
}

.compressor-card {
    background: var(--bg-primary);
    border-radius: var(--radius-xl);
    box-shadow: var(--shadow-lg);
    padding: 3rem;
    margin-bottom: 2rem;
}

.upload-area {
    border: 3px dashed var(--border-color);
    border-radius: var(--radius-lg);
    padding: 4rem 2rem;
    text-align: center;
    transition: var(--transition);
    cursor: pointer;
}

.upload-area:hover {
    border-color: var(--primary-color);
    background-color: var(--primary-light);
}

.upload-area.drag-over {
    border-color: var(--primary-color);
    background-color: var(--primary-light);
    transform: scale(1.02);
}

.upload-icon {
    color: var(--primary-color);
    margin-bottom: 1rem;
}

.upload-title {
    font-size: 1.5rem;
    font-weight: 600;
    color: var(--text-primary);
    margin-bottom: 0.5rem;
}

.upload-subtitle {
    color: var(--text-secondary);
    margin-bottom: 1.5rem;
}

.upload-info {
    font-size: 0.875rem;
    color: var(--text-tertiary);
    margin-top: 1rem;
}

/* ===============================================
   Buttons
   =============================================== */
.btn {
    padding: 0.75rem 1.5rem;
    border: none;
    border-radius: var(--radius-md);
    font-size: 1rem;
    font-weight: 600;
    cursor: pointer;
    transition: var(--transition);
    display: inline-flex;
    align-items: center;
    gap: 0.5rem;
    justify-content: center;
}

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

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

.btn-primary:disabled {
    background-color: var(--secondary-color);
    cursor: not-allowed;
    transform: none;
}

.btn-secondary {
    background-color: transparent;
    color: var(--primary-color);
    border: 2px solid var(--primary-color);
}

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

.btn-large {
    padding: 1rem 2rem;
    font-size: 1.125rem;
}

/* ===============================================
   Progress Section
   =============================================== */
.progress-section {
    padding: 2rem;
    text-align: center;
}

.progress-info {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 0.75rem;
}

.progress-filename {
    font-weight: 600;
    color: var(--text-primary);
    font-size: 1.125rem;
}

.progress-percentage {
    font-weight: 600;
    color: var(--primary-color);
}

.progress-bar {
    width: 100%;
    height: 0.75rem;
    background-color: var(--bg-tertiary);
    border-radius: var(--radius-lg);
    overflow: hidden;
    margin-bottom: 1rem;
}

.progress-fill {
    height: 100%;
    background: linear-gradient(90deg, var(--primary-color), var(--primary-hover));
    border-radius: var(--radius-lg);
    transition: width 0.3s ease;
    width: 0%;
}

.progress-status {
    color: var(--text-secondary);
    font-size: 0.875rem;
}

/* ===============================================
   Result Section
   =============================================== */
.result-section {
    padding: 2rem;
    text-align: center;
}

.result-success {
    margin-bottom: 2rem;
}

.result-icon {
    color: var(--success-color);
    margin-bottom: 1rem;
}

.result-title {
    font-size: 1.75rem;
    font-weight: 700;
    color: var(--text-primary);
}

.result-stats {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(150px, 1fr));
    gap: 1.5rem;
    margin-bottom: 2rem;
    padding: 2rem;
    background-color: var(--bg-secondary);
    border-radius: var(--radius-lg);
}

.stat-item {
    text-align: center;
}

.stat-item.highlight {
    background-color: var(--success-color);
    color: white;
    padding: 1rem;
    border-radius: var(--radius-md);
}

.stat-item.highlight .stat-label,
.stat-item.highlight .stat-value {
    color: white;
}

.stat-label {
    display: block;
    font-size: 0.875rem;
    color: var(--text-tertiary);
    margin-bottom: 0.5rem;
}

.stat-value {
    display: block;
    font-size: 1.5rem;
    font-weight: 700;
    color: var(--text-primary);
}

.result-actions {
    display: flex;
    gap: 1rem;
    justify-content: center;
    flex-wrap: wrap;
}

/* ===============================================
   Error Section
   =============================================== */
.error-section {
    padding: 2rem;
    text-align: center;
}

.error-icon {
    color: var(--error-color);
    margin-bottom: 1rem;
}

.error-title {
    font-size: 1.5rem;
    font-weight: 700;
    color: var(--error-color);
    margin-bottom: 0.5rem;
}

.error-message {
    color: var(--text-secondary);
    margin-bottom: 1.5rem;
}

/* ===============================================
   Features Section
   =============================================== */
.features-section {
    padding: 4rem 0;
    background-color: var(--bg-primary);
}

.section-title {
    font-size: 2.5rem;
    font-weight: 700;
    text-align: center;
    margin-bottom: 3rem;
    color: var(--text-primary);
}

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

.feature-card {
    text-align: center;
    padding: 2rem;
    border-radius: var(--radius-lg);
    transition: var(--transition);
}

.feature-card:hover {
    transform: translateY(-5px);
    box-shadow: var(--shadow-md);
}

.feature-icon {
    font-size: 3rem;
    margin-bottom: 1rem;
}

.feature-title {
    font-size: 1.25rem;
    font-weight: 600;
    color: var(--text-primary);
    margin-bottom: 0.5rem;
}

.feature-description {
    color: var(--text-secondary);
}

/* ===============================================
   Stats Section
   =============================================== */
.stats-section {
    padding: 4rem 0;
}

.stats-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
    gap: 2rem;
}

.stat-card {
    background: var(--bg-primary);
    padding: 2rem;
    border-radius: var(--radius-lg);
    text-align: center;
    box-shadow: var(--shadow-md);
    transition: var(--transition);
}

.stat-card:hover {
    transform: translateY(-5px);
    box-shadow: var(--shadow-lg);
}

.stat-number {
    font-size: 2.5rem;
    font-weight: 700;
    color: var(--primary-color);
    margin-bottom: 0.5rem;
}

/* ===============================================
   Contact Section
   =============================================== */
.contact-section {
    padding: 4rem 0;
    background-color: var(--bg-primary);
}

.contact-card {
    max-width: 600px;
    margin: 0 auto;
    background: var(--bg-secondary);
    padding: 2rem;
    border-radius: var(--radius-xl);
    box-shadow: var(--shadow-lg);
}

.contact-form {
    display: flex;
    flex-direction: column;
    gap: 1.5rem;
}

.form-group {
    display: flex;
    flex-direction: column;
    gap: 0.5rem;
}

.form-group label {
    font-weight: 600;
    color: var(--text-primary);
}

.form-group input,
.form-group textarea {
    padding: 0.75rem;
    border: 2px solid var(--border-color);
    border-radius: var(--radius-md);
    font-family: inherit;
    font-size: 1rem;
    transition: var(--transition);
}

.form-group input:focus,
.form-group textarea:focus {
    outline: none;
    border-color: var(--primary-color);
    box-shadow: 0 0 0 3px var(--primary-light);
}

.form-info {
    font-size: 0.75rem;
    color: var(--text-tertiary);
    text-align: center;
}

.contact-success {
    text-align: center;
    padding: 2rem;
}

.contact-success svg {
    color: var(--success-color);
    margin-bottom: 1rem;
}

.contact-success h3 {
    font-size: 1.5rem;
    color: var(--success-color);
    margin-bottom: 0.5rem;
}

.contact-success p {
    color: var(--text-secondary);
}

/* ===============================================
   Footer
   =============================================== */
.footer {
    background-color: var(--text-primary);
    color: white;
    padding: 2rem 0;
    text-align: center;
}

.footer-info {
    font-size: 0.875rem;
    color: var(--text-tertiary);
    margin-top: 0.5rem;
}

/* ===============================================
   Ad Container
   =============================================== */
.ad-container {
    margin: 2rem auto;
    text-align: center;
    max-width: 728px;
    min-height: 90px;
}

/* ===============================================
   Utility Classes
   =============================================== */
.hidden {
    display: none !important;
}

/* ===============================================
   Responsive
   =============================================== */
@media (max-width: 768px) {
    .hero-title {
        font-size: 2rem;
    }
    
    .hero-subtitle {
        font-size: 1rem;
    }
    
    .nav {
        gap: 1rem;
    }
    
    .compressor-card {
        padding: 1.5rem;
    }
    
    .result-actions {
        flex-direction: column;
    }
    
    .btn {
        width: 100%;
    }
}

@media (max-width: 480px) {
    .header-content {
        flex-direction: column;
        gap: 1rem;
    }
    
    .hero {
        padding: 2rem 0 1rem;
    }
    
    .section-title {
        font-size: 2rem;
    }
}