/* ====================================
   RESET Y VARIABLES CSS
   ==================================== */

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

:root {
    /* Colores principales */
    --primary: #6366f1;
    --primary-dark: #4f46e5;
    --primary-light: #818cf8;
    --secondary: #ec4899;
    --accent: #14b8a6;
    --success: #10b981;
    
    /* Neutrales */
    --white: #ffffff;
    --gray-50: #f8fafc;
    --gray-100: #f1f5f9;
    --gray-200: #e2e8f0;
    --gray-300: #cbd5e1;
    --gray-400: #94a3b8;
    --gray-500: #64748b;
    --gray-700: #334155;
    --gray-900: #0f172a;
    
    /* Sombras */
    --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);
    
    /* Tipografía */
    --font-sans: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, 'Helvetica Neue', Arial, sans-serif;
    
    /* Espaciado base */
    --space-1: 0.25rem;
    --space-2: 0.5rem;
    --space-3: 0.75rem;
    --space-4: 1rem;
    --space-5: 1.25rem;
    --space-6: 1.5rem;
    --space-8: 2rem;
    --space-10: 2.5rem;
    --space-12: 3rem;
    
    /* Transiciones */
    --transition: all 0.2s ease;
}

/* ====================================
   ESTILOS GENERALES DEL BODY
   ==================================== */

body {
    font-family: var(--font-sans);
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    background-attachment: fixed;
    color: var(--gray-900);
    line-height: 1.6;
    min-height: 100vh;
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
}

/* ====================================
   CONTENEDOR PRINCIPAL
   ==================================== */

.container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 var(--space-4);
}

/* ====================================
   HEADER - Compacto y centrado
   ==================================== */

.header {
    background: rgba(255, 255, 255, 0.97);
    backdrop-filter: blur(10px);
    box-shadow: var(--shadow-md);
    padding: var(--space-6) 0;
    animation: slideDown 0.5s ease-out;
}

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

.header-title {
    font-size: 1.75rem;
    font-weight: 800;
    text-align: center;
    background: linear-gradient(135deg, var(--primary), var(--secondary));
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
    margin-bottom: var(--space-2);
    letter-spacing: -0.02em;
}

.header-subtitle {
    text-align: center;
    color: var(--gray-500);
    font-size: 0.95rem;
    font-weight: 500;
}

/* ====================================
   MAIN CONTENT
   ==================================== */

.main-content {
    padding: var(--space-8) 0;
}

/* ====================================
   AD SPACES - Diseño discreto
   ==================================== */

.ad-space {
    background: linear-gradient(135deg, var(--gray-100), var(--gray-200));
    border: 2px dashed var(--gray-300);
    border-radius: 12px;
    padding: var(--space-6);
    text-align: center;
    min-height: 200px;
    display: flex;
    align-items: center;
    justify-content: center;
    transition: var(--transition);
}

.ad-space:hover {
    border-color: var(--gray-400);
    background: linear-gradient(135deg, var(--gray-200), var(--gray-300));
}

.ad-placeholder {
    color: var(--gray-500);
    font-size: 0.875rem;
    font-weight: 600;
}

.ad-top {
    margin-bottom: var(--space-6);
}

.ad-middle {
    margin: var(--space-8) 0;
}

.ad-bottom {
    margin-top: var(--space-8);
}

/* Ocultar ads laterales y bottom en móvil */
.sidebar,
.ad-bottom {
    display: none;
}

/* ====================================
   CONTENT WRAPPER - Layout principal
   ==================================== */

.content-wrapper {
    display: grid;
    grid-template-columns: 1fr;
    gap: var(--space-6);
}

/* ====================================
   CONVERTER SECTION
   ==================================== */

.converter-section {
    animation: fadeInUp 0.6s ease-out;
}

@keyframes fadeInUp {
    from {
        opacity: 0;
        transform: translateY(30px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

/* ====================================
   CONVERTER CARD - Protagonista visual
   ==================================== */

.converter-card {
    background: var(--white);
    border-radius: 16px;
    box-shadow: var(--shadow-xl);
    padding: var(--space-8);
    margin-bottom: var(--space-8);
    transition: transform 0.3s ease, box-shadow 0.3s ease;
}

.converter-card:hover {
    transform: translateY(-4px);
    box-shadow: 0 25px 50px -12px rgba(0, 0, 0, 0.15);
}

.converter-title {
    font-size: 1.5rem;
    font-weight: 700;
    color: var(--gray-900);
    margin-bottom: var(--space-6);
    text-align: center;
}

/* ====================================
   FORM GROUP
   ==================================== */

.form-group {
    margin-bottom: var(--space-6);
}

.form-label {
    display: block;
    font-size: 0.875rem;
    font-weight: 600;
    color: var(--gray-700);
    margin-bottom: var(--space-2);
}

.form-select {
    width: 100%;
    padding: var(--space-3) var(--space-4);
    font-size: 1rem;
    font-weight: 500;
    color: var(--gray-900);
    background-color: var(--white);
    border: 2px solid var(--gray-200);
    border-radius: 10px;
    cursor: pointer;
    transition: var(--transition);
    appearance: none;
    background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='16' height='16' viewBox='0 0 16 16'%3E%3Cpath fill='%236366f1' d='M8 11L3 6h10z'/%3E%3C/svg%3E");
    background-repeat: no-repeat;
    background-position: right var(--space-4) center;
    padding-right: var(--space-10);
}

.form-select:hover {
    border-color: var(--primary-light);
}

.form-select:focus {
    outline: none;
    border-color: var(--primary);
    box-shadow: 0 0 0 3px rgba(99, 102, 241, 0.1);
}

/* ====================================
   CONVERSION CONTAINER
   ==================================== */

.conversion-container {
    display: flex;
    flex-direction: column;
    gap: var(--space-4);
    margin-bottom: var(--space-6);
}

.conversion-group {
    flex: 1;
}

/* ====================================
   INPUT GROUP
   ==================================== */

.input-group {
    display: grid;
    grid-template-columns: 1.5fr 1fr;
    gap: var(--space-3);
}

.form-input {
    width: 100%;
    padding: var(--space-3) var(--space-4);
    font-size: 1.05rem;
    font-weight: 500;
    color: var(--gray-900);
    background-color: var(--white);
    border: 2px solid var(--gray-200);
    border-radius: 10px;
    transition: var(--transition);
}

.form-input:hover {
    border-color: var(--primary-light);
}

.form-input:focus {
    outline: none;
    border-color: var(--primary);
    box-shadow: 0 0 0 3px rgba(99, 102, 241, 0.1);
}

.form-input[readonly] {
    background-color: var(--gray-50);
    cursor: not-allowed;
}

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

.form-select-inline {
    width: 100%;
    padding: var(--space-3) var(--space-2);
    font-size: 0.875rem;
    font-weight: 500;
    color: var(--gray-900);
    background-color: var(--white);
    border: 2px solid var(--gray-200);
    border-radius: 10px;
    cursor: pointer;
    transition: var(--transition);
}

.form-select-inline:hover {
    border-color: var(--primary-light);
}

.form-select-inline:focus {
    outline: none;
    border-color: var(--primary);
    box-shadow: 0 0 0 3px rgba(99, 102, 241, 0.1);
}

/* ====================================
   CONVERSION ICON - Icono central
   ==================================== */

.conversion-icon {
    display: flex;
    align-items: center;
    justify-content: center;
    padding: var(--space-2) 0;
}

.icon-arrow {
    font-size: 1.75rem;
    color: var(--primary);
    animation: pulse 2s ease-in-out infinite;
}

@keyframes pulse {
    0%, 100% {
        opacity: 1;
        transform: scale(1);
    }
    50% {
        opacity: 0.6;
        transform: scale(1.15);
    }
}

/* ====================================
   RESULT DISPLAY
   ==================================== */

.result-display {
    background: linear-gradient(135deg, var(--primary), var(--secondary));
    padding: var(--space-5);
    border-radius: 12px;
    text-align: center;
    animation: fadeIn 0.3s ease;
}

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

.result-text {
    color: var(--white);
    font-size: 1.05rem;
    font-weight: 600;
    line-height: 1.5;
    margin: 0;
}

/* ====================================
   INFO SECTION - Contenido SEO
   ==================================== */

.info-section {
    background: var(--white);
    border-radius: 16px;
    box-shadow: var(--shadow-lg);
    padding: var(--space-8);
}

.info-title {
    font-size: 1.75rem;
    font-weight: 700;
    color: var(--gray-900);
    margin-bottom: var(--space-5);
    line-height: 1.3;
}

.info-subtitle {
    font-size: 1.35rem;
    font-weight: 600;
    color: var(--primary);
    margin-top: var(--space-8);
    margin-bottom: var(--space-4);
    line-height: 1.3;
}

.info-text {
    font-size: 1rem;
    line-height: 1.7;
    color: var(--gray-700);
    margin-bottom: var(--space-5);
}

.info-list {
    list-style: none;
    padding: 0;
    margin: var(--space-5) 0;
}

.info-list li {
    font-size: 1rem;
    line-height: 1.7;
    color: var(--gray-700);
    margin-bottom: var(--space-3);
    padding-left: var(--space-6);
    position: relative;
}

.info-list li::before {
    content: "✓";
    position: absolute;
    left: 0;
    top: 0;
    color: var(--success);
    font-weight: bold;
    font-size: 1.25rem;
}

.info-list li strong {
    color: var(--gray-900);
    font-weight: 600;
}

/* ====================================
   CATEGORIES GRID
   ==================================== */

.categories-grid {
    display: grid;
    grid-template-columns: 1fr;
    gap: var(--space-4);
    margin-top: var(--space-5);
}

.category-item {
    background: var(--gray-50);
    padding: var(--space-5);
    border-radius: 12px;
    border-left: 4px solid var(--primary);
    transition: var(--transition);
}

.category-item:hover {
    transform: translateX(6px);
    box-shadow: var(--shadow-md);
    background: var(--white);
}

.category-item h4 {
    font-size: 1.1rem;
    font-weight: 700;
    color: var(--gray-900);
    margin-bottom: var(--space-2);
}

.category-item p {
    font-size: 0.95rem;
    line-height: 1.6;
    color: var(--gray-700);
    margin: 0;
}

/* ====================================
   FOOTER
   ==================================== */

.footer {
    background: rgba(255, 255, 255, 0.97);
    backdrop-filter: blur(10px);
    box-shadow: 0 -4px 6px -1px rgba(0, 0, 0, 0.1);
    padding: var(--space-8) 0;
    margin-top: var(--space-12);
}

.footer-nav {
    display: flex;
    flex-wrap: wrap;
    justify-content: center;
    align-items: center;
    gap: var(--space-4);
    margin-bottom: var(--space-4);
}

.footer-link {
    color: var(--gray-900);
    text-decoration: none;
    font-size: 0.9rem;
    font-weight: 500;
    transition: var(--transition);
}

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

.footer-separator {
    color: var(--gray-400);
}

.footer-text {
    text-align: center;
    color: var(--gray-500);
    font-size: 0.875rem;
    margin: 0;
}

/* ====================================
   RESPONSIVE - TABLET (768px+)
   ==================================== */

@media (min-width: 768px) {
    .header-title {
        font-size: 2.25rem;
    }
    
    .header-subtitle {
        font-size: 1.05rem;
    }
    
    .conversion-container {
        flex-direction: row;
        align-items: flex-end;
    }
    
    .conversion-icon {
        padding: 0 var(--space-4);
        margin-bottom: var(--space-8);
    }
    
    .categories-grid {
        grid-template-columns: repeat(2, 1fr);
    }
    
    .ad-middle {
        display: none;
    }
}

/* ====================================
   RESPONSIVE - DESKTOP (1024px+)
   ==================================== */

@media (min-width: 1024px) {
    .content-wrapper {
        grid-template-columns: 240px 1fr 240px;
        gap: var(--space-8);
    }
    
    .sidebar {
        display: block;
    }
    
    .ad-sidebar {
        position: sticky;
        top: var(--space-6);
        min-height: 600px;
    }
    
    .ad-top {
        max-width: 728px;
        margin-left: auto;
        margin-right: auto;
    }
    
    .converter-card {
        padding: var(--space-10);
    }
    
    .info-section {
        padding: var(--space-10);
    }
}

/* ====================================
   RESPONSIVE - LARGE DESKTOP (1280px+)
   ==================================== */

@media (min-width: 1280px) {
    .content-wrapper {
        grid-template-columns: 280px 1fr 280px;
    }
    
    .categories-grid {
        grid-template-columns: repeat(4, 1fr);
    }
}

/* ====================================
   ACCESIBILIDAD
   ==================================== */

@media (prefers-reduced-motion: reduce) {
    *,
    *::before,
    *::after {
        animation-duration: 0.01ms !important;
        animation-iteration-count: 1 !important;
        transition-duration: 0.01ms !important;
    }
}

:focus-visible {
    outline: 3px solid var(--primary);
    outline-offset: 2px;
    border-radius: 4px;
}

/* ====================================
   OPTIMIZACIONES DE RENDIMIENTO
   ==================================== */

.converter-card,
.info-section,
.ad-space {
    will-change: transform;
}

@media (hover: hover) {
    .converter-card:hover,
    .category-item:hover {
        will-change: transform;
    }
}