/* ========================================
   VARIABLES Y RESET
======================================== */
:root {
    /* Colores principales - Paleta moderna */
    --primary: #0070f3;
    --primary-hover: #0761d1;
    --primary-light: #3291ff;
    --secondary: #7928ca;
    --secondary-hover: #6921b0;
    --success: #0070f3;
    --success-hover: #0761d1;
    --danger: #e00;
    --danger-hover: #c00;
    
    /* Grises y neutros */
    --gray-50: #fafafa;
    --gray-100: #f5f5f5;
    --gray-200: #e5e5e5;
    --gray-300: #d4d4d4;
    --gray-400: #a3a3a3;
    --gray-500: #737373;
    --gray-600: #525252;
    --gray-700: #404040;
    --gray-800: #262626;
    --gray-900: #171717;
    
    /* Backgrounds */
    --bg-primary: #ffffff;
    --bg-secondary: #fafafa;
    --bg-card: #ffffff;
    
    /* Texto */
    --text-primary: #171717;
    --text-secondary: #525252;
    --text-muted: #737373;
    
    /* Bordes */
    --border-color: #e5e5e5;
    --border-radius: 12px;
    --border-radius-sm: 8px;
    --border-radius-lg: 16px;
    
    /* Sombras modernas */
    --shadow-sm: 0 1px 2px 0 rgba(0, 0, 0, 0.05);
    --shadow: 0 1px 3px 0 rgba(0, 0, 0, 0.1), 0 1px 2px -1px rgba(0, 0, 0, 0.1);
    --shadow-md: 0 4px 6px -1px rgba(0, 0, 0, 0.1), 0 2px 4px -2px rgba(0, 0, 0, 0.1);
    --shadow-lg: 0 10px 15px -3px rgba(0, 0, 0, 0.1), 0 4px 6px -4px rgba(0, 0, 0, 0.1);
    --shadow-xl: 0 20px 25px -5px rgba(0, 0, 0, 0.1), 0 8px 10px -6px rgba(0, 0, 0, 0.1);
    
    /* Espaciados */
    --spacing-xs: 0.5rem;
    --spacing-sm: 0.75rem;
    --spacing-md: 1rem;
    --spacing-lg: 1.5rem;
    --spacing-xl: 2rem;
    --spacing-2xl: 3rem;
    
    /* Transiciones */
    --transition-fast: 150ms ease;
    --transition-base: 200ms ease;
    --transition-slow: 300ms ease;
}

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

html {
    font-size: 16px;
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
}

body {
    font-family: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', 'Roboto', 'Oxygen', 'Ubuntu', sans-serif;
    background: var(--bg-secondary);
    color: var(--text-primary);
    line-height: 1.6;
    overflow-x: hidden;
    display: flex;
    min-height: 100vh;
}

/* ========================================
   LAYOUT PRINCIPAL CON ADSENSE
======================================== */
.main-wrapper {
    flex: 1;
    display: flex;
    flex-direction: column;
    max-width: 1400px;
    margin: 0 auto;
    width: 100%;
}

.container {
    width: 100%;
    max-width: 800px;
    margin: 0 auto;
    padding: 0 var(--spacing-lg);
}

/* AdSense Containers - Desktop */
.ad-container {
    display: none;
    width: 160px;
    position: sticky;
    top: var(--spacing-xl);
    height: fit-content;
    max-height: calc(100vh - 4rem);
}

.ad-left {
    order: -1;
}

.ad-right {
    order: 1;
}

.ad-placeholder {
    background: var(--gray-100);
    border: 1px dashed var(--border-color);
    border-radius: var(--border-radius);
    padding: var(--spacing-xl);
    min-height: 600px;
    display: flex;
    align-items: center;
    justify-content: center;
    transition: all var(--transition-base);
}

.ad-placeholder:hover {
    border-color: var(--gray-300);
    background: var(--gray-50);
}

.ad-label {
    font-size: 0.75rem;
    color: var(--text-muted);
    font-weight: 500;
    text-transform: uppercase;
    letter-spacing: 0.05em;
}

/* AdSense Mobile */
.ad-mobile {
    display: block;
    margin: var(--spacing-xl) 0;
}

.ad-placeholder-mobile {
    background: var(--gray-100);
    border: 1px dashed var(--border-color);
    border-radius: var(--border-radius);
    padding: var(--spacing-lg);
    min-height: 250px;
    display: flex;
    align-items: center;
    justify-content: center;
}

/* ========================================
   HEADER
======================================== */
.header {
    background: var(--bg-primary);
    border-bottom: 1px solid var(--border-color);
    padding: var(--spacing-xl) 0;
    margin-bottom: var(--spacing-2xl);
}

.logo {
    font-size: 1.75rem;
    font-weight: 700;
    color: var(--text-primary);
    display: flex;
    align-items: center;
    gap: var(--spacing-sm);
    margin-bottom: var(--spacing-xs);
}

.logo-icon {
    width: 32px;
    height: 32px;
    color: var(--primary);
}

.tagline {
    font-size: 0.95rem;
    color: var(--text-secondary);
    font-weight: 400;
}

/* ========================================
   MAIN CONTENT
======================================== */
.main-content {
    flex: 1;
    padding-bottom: var(--spacing-2xl);
}

/* Converter Section */
.converter-section {
    margin-bottom: var(--spacing-2xl);
}

.converter-card {
    background: var(--bg-card);
    border: 1px solid var(--border-color);
    border-radius: var(--border-radius-lg);
    padding: var(--spacing-2xl);
    box-shadow: var(--shadow-sm);
    transition: box-shadow var(--transition-base);
}

.converter-card:hover {
    box-shadow: var(--shadow-md);
}

.card-header {
    margin-bottom: var(--spacing-xl);
    text-align: center;
}

.section-title {
    font-size: 2rem;
    font-weight: 700;
    color: var(--text-primary);
    margin-bottom: var(--spacing-sm);
    letter-spacing: -0.02em;
}

.section-description {
    font-size: 1rem;
    color: var(--text-secondary);
    font-weight: 400;
}

/* Textarea */
.textarea-wrapper {
    margin-bottom: var(--spacing-xl);
    position: relative;
}

.text-input {
    width: 100%;
    min-height: 280px;
    padding: var(--spacing-lg);
    font-family: 'Inter', monospace;
    font-size: 1rem;
    line-height: 1.6;
    color: var(--text-primary);
    background: var(--bg-primary);
    border: 2px solid var(--border-color);
    border-radius: var(--border-radius);
    resize: vertical;
    transition: all var(--transition-base);
    outline: none;
}

.text-input:hover {
    border-color: var(--gray-300);
}

.text-input:focus {
    border-color: var(--primary);
    box-shadow: 0 0 0 3px rgba(0, 112, 243, 0.1);
}

.text-input::placeholder {
    color: var(--gray-400);
}

.textarea-footer {
    margin-top: var(--spacing-sm);
    display: flex;
    justify-content: flex-end;
}

.counter-group {
    display: flex;
    align-items: center;
    gap: var(--spacing-sm);
    font-size: 0.875rem;
}

.counter-item {
    display: flex;
    align-items: baseline;
    gap: 0.25rem;
}

.counter-value {
    font-weight: 600;
    color: var(--primary);
    font-size: 1rem;
}

.counter-label {
    color: var(--text-muted);
    font-weight: 400;
}

.counter-divider {
    color: var(--border-color);
}

/* Actions Grid */
.actions-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(180px, 1fr));
    gap: var(--spacing-md);
}

/* Buttons */
.btn {
    display: flex;
    align-items: center;
    justify-content: center;
    gap: var(--spacing-sm);
    padding: 0.875rem var(--spacing-lg);
    font-family: 'Inter', sans-serif;
    font-size: 0.9375rem;
    font-weight: 600;
    border: none;
    border-radius: var(--border-radius-sm);
    cursor: pointer;
    transition: all var(--transition-base);
    position: relative;
    overflow: hidden;
    white-space: nowrap;
}

.btn::before {
    content: '';
    position: absolute;
    top: 50%;
    left: 50%;
    width: 0;
    height: 0;
    border-radius: 50%;
    background: rgba(255, 255, 255, 0.3);
    transform: translate(-50%, -50%);
    transition: width 0.6s, height 0.6s;
}

.btn:active::before {
    width: 300px;
    height: 300px;
}

.btn-icon {
    width: 18px;
    height: 18px;
    flex-shrink: 0;
}

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

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

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

.btn-secondary {
    background: var(--secondary);
    color: white;
    box-shadow: var(--shadow-sm);
}

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

.btn-success {
    background: var(--success);
    color: white;
    box-shadow: var(--shadow-sm);
}

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

.btn-danger {
    background: var(--danger);
    color: white;
    box-shadow: var(--shadow-sm);
}

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

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

/* ========================================
   CONTENT SECTION (SEO)
======================================== */
.content-section {
    margin-bottom: var(--spacing-2xl);
}

.content-card {
    background: var(--bg-card);
    border: 1px solid var(--border-color);
    border-radius: var(--border-radius);
    padding: var(--spacing-xl);
    margin-bottom: var(--spacing-lg);
    box-shadow: var(--shadow-sm);
}

.content-title {
    font-size: 1.75rem;
    font-weight: 700;
    color: var(--text-primary);
    margin-bottom: var(--spacing-lg);
    letter-spacing: -0.01em;
}

.content-subtitle {
    font-size: 1.375rem;
    font-weight: 600;
    color: var(--text-primary);
    margin-bottom: var(--spacing-md);
    letter-spacing: -0.01em;
}

.content-text {
    font-size: 1rem;
    line-height: 1.75;
    color: var(--text-secondary);
    margin-bottom: var(--spacing-md);
}

.content-text:last-child {
    margin-bottom: 0;
}

/* ========================================
   FOOTER
======================================== */
.footer {
    background: var(--bg-primary);
    border-top: 1px solid var(--border-color);
    padding: var(--spacing-xl) 0;
    margin-top: auto;
}

.footer-content {
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: var(--spacing-md);
}

.footer-text {
    font-size: 0.875rem;
    color: var(--text-muted);
    text-align: center;
}

.footer-nav {
    display: flex;
    gap: var(--spacing-lg);
    flex-wrap: wrap;
    justify-content: center;
}

.footer-link {
    font-size: 0.875rem;
    color: var(--text-secondary);
    text-decoration: none;
    transition: color var(--transition-fast);
    position: relative;
}

.footer-link::after {
    content: '';
    position: absolute;
    bottom: -2px;
    left: 0;
    width: 0;
    height: 2px;
    background: var(--primary);
    transition: width var(--transition-base);
}

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

.footer-link:hover::after {
    width: 100%;
}

/* ========================================
   TOAST NOTIFICATION
======================================== */
.toast {
    position: fixed;
    bottom: 2rem;
    right: 2rem;
    background: var(--gray-900);
    color: white;
    padding: var(--spacing-md) var(--spacing-xl);
    border-radius: var(--border-radius);
    box-shadow: var(--shadow-xl);
    display: flex;
    align-items: center;
    gap: var(--spacing-sm);
    font-size: 0.9375rem;
    font-weight: 500;
    opacity: 0;
    transform: translateY(100px);
    pointer-events: none;
    transition: all var(--transition-slow);
    z-index: 1000;
    max-width: 90vw;
}

.toast.show {
    opacity: 1;
    transform: translateY(0);
    pointer-events: auto;
}

.toast.success {
    background: linear-gradient(135deg, #0070f3 0%, #00d4ff 100%);
}

.toast.error {
    background: linear-gradient(135deg, #e00 0%, #ff6b6b 100%);
}

/* ========================================
   RESPONSIVE DESIGN
======================================== */

/* Tablets y pantallas medianas */
@media (max-width: 1024px) {
    .ad-container {
        display: none;
    }
    
    .section-title {
        font-size: 1.75rem;
    }
    
    .actions-grid {
        grid-template-columns: repeat(auto-fit, minmax(160px, 1fr));
    }
}

/* Móviles */
@media (max-width: 768px) {
    :root {
        --spacing-xl: 1.5rem;
        --spacing-2xl: 2rem;
    }
    
    .container {
        padding: 0 var(--spacing-md);
    }
    
    .header {
        padding: var(--spacing-lg) 0;
        margin-bottom: var(--spacing-xl);
    }
    
    .logo {
        font-size: 1.5rem;
    }
    
    .logo-icon {
        width: 28px;
        height: 28px;
    }
    
    .tagline {
        font-size: 0.875rem;
    }
    
    .converter-card {
        padding: var(--spacing-lg);
        border-radius: var(--border-radius);
    }
    
    .section-title {
        font-size: 1.5rem;
    }
    
    .section-description {
        font-size: 0.9375rem;
    }
    
    .text-input {
        min-height: 200px;
        font-size: 1rem;
    }
    
    .actions-grid {
        grid-template-columns: 1fr;
        gap: var(--spacing-sm);
    }
    
    .btn {
        padding: 1rem var(--spacing-lg);
        font-size: 1rem;
    }
    
    .content-title {
        font-size: 1.5rem;
    }
    
    .content-subtitle {
        font-size: 1.25rem;
    }
    
    .content-text {
        font-size: 0.9375rem;
    }
    
    .toast {
        bottom: 1rem;
        right: 1rem;
        left: 1rem;
        font-size: 0.875rem;
    }
    
    .ad-mobile {
        margin: var(--spacing-lg) 0;
    }
    
    .ad-placeholder-mobile {
        min-height: 200px;
    }
    
    .footer-nav {
        flex-direction: column;
        gap: var(--spacing-sm);
        align-items: center;
    }
}

/* Desktop grande - Mostrar ads laterales */
@media (min-width: 1280px) {
    body {
        gap: var(--spacing-xl);
    }
    
    .ad-container {
        display: block;
    }
    
    .ad-mobile {
        display: none;
    }
}

/* Animaciones adicionales */
@keyframes slideUp {
    from {
        opacity: 0;
        transform: translateY(20px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

.converter-card,
.content-card {
    animation: slideUp 0.5s ease-out;
}

/* Focus visible para accesibilidad */
*:focus-visible {
    outline: 2px solid var(--primary);
    outline-offset: 2px;
}

/* Mejora de rendimiento */
.btn,
.text-input,
.footer-link {
    will-change: transform;
}