/* ===================================
   Reset y Variables
   =================================== */

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

:root {
    /* Colores - Modo Claro */
    --color-primary: #007AFF;
    --color-primary-dark: #0051D5;
    --color-primary-light: #E3F2FD;
    --color-secondary: #FF6B35;
    --color-text: #1D1D1F;
    --color-text-light: #6E6E73;
    --color-bg: #FFFFFF;
    --color-bg-secondary: #F5F5F7;
    --color-border: #D2D2D7;
    --color-shadow: rgba(0, 0, 0, 0.1);
    --color-shadow-hover: rgba(0, 0, 0, 0.15);
    
    /* Tipografía */
    --font-family: -apple-system, BlinkMacSystemFont, 'SF Pro Display', 'SF Pro Text', 'Inter', 'Segoe UI', Roboto, 'Helvetica Neue', Arial, sans-serif;
    --font-size-xs: 0.75rem;
    --font-size-sm: 0.875rem;
    --font-size-base: 1rem;
    --font-size-lg: 1.125rem;
    --font-size-xl: 1.25rem;
    --font-size-2xl: 1.5rem;
    --font-size-3xl: 2rem;
    --font-size-4xl: 2.5rem;
    --font-size-5xl: 3rem;
    
    /* Espaciado */
    --spacing-xs: 0.5rem;
    --spacing-sm: 1rem;
    --spacing-md: 1.5rem;
    --spacing-lg: 2rem;
    --spacing-xl: 3rem;
    --spacing-2xl: 4rem;
    
    /* Bordes */
    --radius-sm: 0.375rem;
    --radius-md: 0.5rem;
    --radius-lg: 0.75rem;
    --radius-xl: 1rem;
    --radius-2xl: 1.5rem;
    
    /* Transiciones */
    --transition-fast: 150ms ease;
    --transition-base: 250ms ease;
    --transition-slow: 350ms ease;
}

[data-theme="dark"] {
    --color-primary: #0A84FF;
    --color-primary-dark: #409CFF;
    --color-primary-light: #1A1A1F;
    --color-text: #F5F5F7;
    --color-text-light: #86868B;
    --color-bg: #000000;
    --color-bg-secondary: #1D1D1F;
    --color-border: #2D2D30;
    --color-shadow: rgba(0, 0, 0, 0.5);
    --color-shadow-hover: rgba(0, 0, 0, 0.7);
}

@media (prefers-color-scheme: dark) {
    :root:not([data-theme]) {
        --color-primary: #0A84FF;
        --color-primary-dark: #409CFF;
        --color-primary-light: #1A1A1F;
        --color-text: #F5F5F7;
        --color-text-light: #86868B;
        --color-bg: #000000;
        --color-bg-secondary: #1D1D1F;
        --color-border: #2D2D30;
        --color-shadow: rgba(0, 0, 0, 0.5);
        --color-shadow-hover: rgba(0, 0, 0, 0.7);
    }
}

/* ===================================
   Base
   =================================== */

html {
    scroll-behavior: smooth;
    font-size: 16px;
}

body {
    font-family: var(--font-family);
    font-size: var(--font-size-base);
    line-height: 1.6;
    color: var(--color-text);
    background-color: var(--color-bg);
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
    transition: background-color var(--transition-base), color var(--transition-base);
}

img {
    max-width: 100%;
    height: auto;
    display: block;
}

a {
    color: var(--color-primary);
    text-decoration: none;
    transition: color var(--transition-fast);
}

a:hover {
    color: var(--color-primary-dark);
}

button {
    font-family: inherit;
    cursor: pointer;
    border: none;
    background: none;
}

/* ===================================
   Utilidades
   =================================== */

.container {
    width: 100%;
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 var(--spacing-sm);
}

@media (min-width: 768px) {
    .container {
        padding: 0 var(--spacing-lg);
    }
}

/* ===================================
   Header
   =================================== */

.header {
    position: sticky;
    top: 0;
    z-index: 100;
    background-color: var(--color-bg);
    border-bottom: 1px solid var(--color-border);
    backdrop-filter: blur(10px);
    -webkit-backdrop-filter: blur(10px);
    transition: background-color var(--transition-base), border-color var(--transition-base);
}

.header-content {
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: var(--spacing-sm) 0;
    gap: var(--spacing-md);
}

.logo {
    display: flex;
    align-items: center;
    gap: var(--spacing-xs);
    font-weight: 700;
    font-size: var(--font-size-lg);
    color: var(--color-text);
}

.logo img {
    display: block;
    flex-shrink: 0;
    border-radius: var(--radius-md);
}

.nav {
    display: none;
}

@media (min-width: 768px) {
    .nav {
        display: block;
    }
}

.nav-list {
    display: flex;
    list-style: none;
    gap: var(--spacing-lg);
}

.nav-link {
    color: var(--color-text);
    font-size: var(--font-size-sm);
    font-weight: 500;
    transition: color var(--transition-fast);
}

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

.header-actions {
    display: flex;
    align-items: center;
    gap: var(--spacing-sm);
}

.theme-toggle {
    padding: var(--spacing-xs);
    color: var(--color-text);
    border-radius: var(--radius-md);
    transition: background-color var(--transition-fast), color var(--transition-fast);
    display: flex;
    align-items: center;
    justify-content: center;
}

.theme-toggle:hover {
    background-color: var(--color-bg-secondary);
}

.theme-toggle .icon-moon {
    display: none;
}

[data-theme="dark"] .theme-toggle .icon-moon {
    display: block;
}

[data-theme="dark"] .theme-toggle .icon-sun {
    display: none;
}

@media (prefers-color-scheme: dark) {
    :root:not([data-theme]) .theme-toggle .icon-moon {
        display: block;
    }
    
    :root:not([data-theme]) .theme-toggle .icon-sun {
        display: none;
    }
}

/* ===================================
   Botones
   =================================== */

.btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: var(--spacing-xs);
    padding: 0.75rem 1.5rem;
    font-size: var(--font-size-base);
    font-weight: 600;
    border-radius: var(--radius-lg);
    transition: all var(--transition-base);
    white-space: nowrap;
}

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

.btn-primary:hover {
    background-color: var(--color-primary-dark);
    transform: translateY(-2px);
    box-shadow: 0 4px 12px var(--color-shadow-hover);
}

.btn-secondary {
    background-color: var(--color-bg-secondary);
    color: var(--color-text);
    border: 1px solid var(--color-border);
}

.btn-secondary:hover {
    background-color: var(--color-border);
    transform: translateY(-2px);
}

.btn-large {
    padding: 1rem 2rem;
    font-size: var(--font-size-lg);
}

/* ===================================
   Hero
   =================================== */

.hero {
    padding: var(--spacing-2xl) 0;
    overflow: hidden;
}

@media (min-width: 768px) {
    .hero {
        padding: var(--spacing-2xl) 0 calc(var(--spacing-2xl) * 1.5);
    }
}

.hero-content {
    display: grid;
    gap: var(--spacing-xl);
    align-items: center;
}

@media (min-width: 1024px) {
    .hero-content {
        grid-template-columns: 1fr 1fr;
        gap: var(--spacing-2xl);
    }
}

.hero-title {
    font-size: var(--font-size-4xl);
    font-weight: 700;
    line-height: 1.1;
    margin-bottom: var(--spacing-md);
    color: var(--color-text);
}

@media (min-width: 768px) {
    .hero-title {
        font-size: var(--font-size-5xl);
    }
}

.hero-subtitle {
    font-size: var(--font-size-xl);
    color: var(--color-text-light);
    margin-bottom: var(--spacing-lg);
    line-height: 1.5;
}

.hero-badges {
    display: flex;
    flex-wrap: wrap;
    gap: var(--spacing-xs);
    margin-bottom: var(--spacing-lg);
}

.badge {
    display: inline-block;
    padding: 0.375rem 0.75rem;
    font-size: var(--font-size-sm);
    font-weight: 500;
    background-color: var(--color-bg-secondary);
    color: var(--color-text);
    border-radius: var(--radius-xl);
    border: 1px solid var(--color-border);
}

.hero-cta {
    display: flex;
    flex-wrap: wrap;
    gap: var(--spacing-sm);
}

.hero-image {
    display: flex;
    justify-content: center;
    align-items: center;
}

.phone-mockup {
    position: relative;
    max-width: 300px;
    margin: 0 auto;
    animation: float 6s ease-in-out infinite;
}

@keyframes float {
    0%, 100% {
        transform: translateY(0px);
    }
    50% {
        transform: translateY(-20px);
    }
}

.phone-mockup img {
    width: 100%;
    height: auto;
    border-radius: var(--radius-2xl);
    box-shadow: 0 20px 60px var(--color-shadow);
    transition: transform var(--transition-slow);
}

.phone-mockup:hover img {
    transform: scale(1.05);
}

/* ===================================
   Social Proof
   =================================== */

.social-proof {
    padding: var(--spacing-xl) 0;
    background-color: var(--color-bg-secondary);
    text-align: center;
}

.social-proof-text {
    font-size: var(--font-size-lg);
    font-weight: 600;
    color: var(--color-text);
    margin-bottom: var(--spacing-lg);
}

.metrics {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(150px, 1fr));
    gap: var(--spacing-lg);
    max-width: 800px;
    margin: 0 auto;
}

.metric {
    padding: var(--spacing-md);
}

.metric-label {
    font-size: var(--font-size-sm);
    font-weight: 600;
    color: var(--color-text-light);
    text-transform: uppercase;
    letter-spacing: 0.05em;
    margin-bottom: var(--spacing-xs);
}

.metric-value {
    font-size: var(--font-size-xl);
    font-weight: 700;
    color: var(--color-text);
}

/* ===================================
   Features
   =================================== */

.features {
    padding: var(--spacing-2xl) 0;
}

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

.features-grid {
    display: grid;
    grid-template-columns: 1fr;
    gap: var(--spacing-lg);
}

@media (min-width: 768px) {
    .features-grid {
        grid-template-columns: repeat(2, 1fr);
    }
}

@media (min-width: 1024px) {
    .features-grid {
        grid-template-columns: repeat(3, 1fr);
    }
}

.feature-card {
    padding: var(--spacing-lg);
    background-color: var(--color-bg-secondary);
    border-radius: var(--radius-xl);
    border: 1px solid var(--color-border);
    transition: all var(--transition-base);
}

.feature-card:hover {
    transform: translateY(-4px);
    box-shadow: 0 8px 24px var(--color-shadow);
    border-color: var(--color-primary);
}

.feature-icon {
    width: 48px;
    height: 48px;
    display: flex;
    align-items: center;
    justify-content: center;
    background-color: var(--color-primary-light);
    color: var(--color-primary);
    border-radius: var(--radius-lg);
    margin-bottom: var(--spacing-md);
    transition: transform var(--transition-base);
}

.feature-card:hover .feature-icon {
    transform: scale(1.1) rotate(5deg);
}

.feature-title {
    font-size: var(--font-size-xl);
    font-weight: 700;
    margin-bottom: var(--spacing-xs);
    color: var(--color-text);
}

.feature-description {
    color: var(--color-text-light);
    line-height: 1.6;
}

/* ===================================
   How It Works
   =================================== */

.how-it-works {
    padding: var(--spacing-2xl) 0;
    background-color: var(--color-bg-secondary);
}

.steps {
    display: grid;
    grid-template-columns: 1fr;
    gap: var(--spacing-xl);
    max-width: 900px;
    margin: 0 auto;
}

@media (min-width: 768px) {
    .steps {
        grid-template-columns: repeat(3, 1fr);
    }
}

.step {
    text-align: center;
    position: relative;
}

.step-number {
    width: 64px;
    height: 64px;
    display: flex;
    align-items: center;
    justify-content: center;
    margin: 0 auto var(--spacing-md);
    font-size: var(--font-size-2xl);
    font-weight: 700;
    background-color: var(--color-primary);
    color: white;
    border-radius: 50%;
    box-shadow: 0 4px 12px var(--color-shadow);
}

.step-title {
    font-size: var(--font-size-xl);
    font-weight: 700;
    margin-bottom: var(--spacing-xs);
    color: var(--color-text);
}

.step-description {
    color: var(--color-text-light);
    line-height: 1.6;
}

/* ===================================
   Gallery
   =================================== */

.gallery {
    padding: var(--spacing-2xl) 0;
}

.gallery-grid {
    display: grid;
    grid-template-columns: 1fr;
    gap: var(--spacing-lg);
}

@media (min-width: 768px) {
    .gallery-grid {
        grid-template-columns: repeat(2, 1fr);
    }
}

.gallery-item {
    position: relative;
    border-radius: var(--radius-xl);
    overflow: hidden;
    background-color: var(--color-bg-secondary);
    transition: transform var(--transition-base);
}

.gallery-item:hover {
    transform: translateY(-4px);
}

.gallery-item img {
    width: 100%;
    height: auto;
    display: block;
    transition: transform var(--transition-slow);
}

.gallery-item:hover img {
    transform: scale(1.05);
}

.gallery-caption {
    padding: var(--spacing-md);
    text-align: center;
    font-weight: 500;
    color: var(--color-text);
}

/* ===================================
   Privacy
   =================================== */

.privacy {
    padding: var(--spacing-2xl) 0;
    background-color: var(--color-bg-secondary);
}

.privacy-content {
    max-width: 800px;
    margin: 0 auto;
}

.privacy-highlight {
    text-align: center;
    padding: var(--spacing-xl);
    background-color: var(--color-primary-light);
    border-radius: var(--radius-xl);
    margin-bottom: var(--spacing-xl);
    border: 2px solid var(--color-primary);
}

.privacy-highlight svg {
    color: var(--color-primary);
    margin: 0 auto var(--spacing-md);
}

.privacy-highlight h3 {
    font-size: var(--font-size-2xl);
    font-weight: 700;
    margin-bottom: var(--spacing-xs);
    color: var(--color-text);
}

.privacy-highlight p {
    font-size: var(--font-size-lg);
    color: var(--color-text);
}

.privacy-permissions h3 {
    font-size: var(--font-size-2xl);
    font-weight: 700;
    margin-bottom: var(--spacing-md);
    color: var(--color-text);
}

.privacy-permissions ul {
    list-style: none;
    margin-bottom: var(--spacing-md);
}

.privacy-permissions li {
    padding: var(--spacing-sm) 0;
    padding-left: var(--spacing-lg);
    position: relative;
    color: var(--color-text-light);
    line-height: 1.6;
}

.privacy-permissions li::before {
    content: '✓';
    position: absolute;
    left: 0;
    color: var(--color-primary);
    font-weight: 700;
}

.privacy-permissions strong {
    color: var(--color-text);
}

.privacy-note {
    padding: var(--spacing-md);
    background-color: var(--color-bg);
    border-radius: var(--radius-md);
    border-left: 4px solid var(--color-primary);
    color: var(--color-text-light);
    font-size: var(--font-size-sm);
}

/* ===================================
   FAQ
   =================================== */

.faq {
    padding: var(--spacing-2xl) 0;
}

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

.faq-item {
    border-bottom: 1px solid var(--color-border);
}

.faq-question {
    width: 100%;
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: var(--spacing-lg) 0;
    text-align: left;
    font-size: var(--font-size-lg);
    font-weight: 600;
    color: var(--color-text);
    transition: color var(--transition-fast);
}

.faq-question:hover {
    color: var(--color-primary);
}

.faq-question:focus {
    outline: 2px solid var(--color-primary);
    outline-offset: 4px;
    border-radius: var(--radius-sm);
}

.faq-icon {
    flex-shrink: 0;
    margin-left: var(--spacing-md);
    transition: transform var(--transition-base);
}

.faq-question[aria-expanded="true"] .faq-icon {
    transform: rotate(180deg);
}

.faq-answer {
    padding-bottom: var(--spacing-lg);
    color: var(--color-text-light);
    line-height: 1.6;
    animation: slideDown var(--transition-base) ease-out;
}

@keyframes slideDown {
    from {
        opacity: 0;
        transform: translateY(-10px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

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

/* ===================================
   CTA Final
   =================================== */

.cta-final {
    padding: var(--spacing-2xl) 0;
    background: linear-gradient(135deg, var(--color-primary), var(--color-secondary));
    text-align: center;
    color: white;
}

.cta-title {
    font-size: var(--font-size-3xl);
    font-weight: 700;
    margin-bottom: var(--spacing-sm);
    color: white;
}

.cta-subtitle {
    font-size: var(--font-size-xl);
    margin-bottom: var(--spacing-lg);
    opacity: 0.95;
}

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

.cta-final .btn-primary:hover {
    background-color: var(--color-bg-secondary);
    transform: translateY(-2px);
    box-shadow: 0 8px 24px rgba(0, 0, 0, 0.3);
}

/* ===================================
   Footer
   =================================== */

.footer {
    padding: var(--spacing-xl) 0;
    background-color: var(--color-bg-secondary);
    border-top: 1px solid var(--color-border);
}

.footer-content {
    display: flex;
    flex-direction: column;
    gap: var(--spacing-md);
    margin-bottom: var(--spacing-lg);
}

@media (min-width: 768px) {
    .footer-content {
        flex-direction: row;
        justify-content: space-between;
        align-items: center;
    }
}

.footer-logo {
    display: flex;
    align-items: center;
    gap: var(--spacing-xs);
    font-weight: 700;
    font-size: var(--font-size-lg);
    color: var(--color-text);
}

.footer-logo img {
    display: block;
    flex-shrink: 0;
    border-radius: var(--radius-md);
}

.footer-links {
    display: flex;
    gap: var(--spacing-lg);
}

.footer-links a {
    color: var(--color-text-light);
    font-size: var(--font-size-sm);
    transition: color var(--transition-fast);
}

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

.footer-bottom {
    text-align: center;
    padding-top: var(--spacing-lg);
    border-top: 1px solid var(--color-border);
}

.footer-bottom p {
    font-size: var(--font-size-sm);
    color: var(--color-text-light);
}

/* ===================================
   Back to Top
   =================================== */

.back-to-top {
    position: fixed;
    bottom: var(--spacing-lg);
    right: var(--spacing-lg);
    width: 48px;
    height: 48px;
    display: flex;
    align-items: center;
    justify-content: center;
    background-color: var(--color-primary);
    color: white;
    border-radius: 50%;
    box-shadow: 0 4px 12px var(--color-shadow);
    z-index: 50;
    transition: all var(--transition-base);
    opacity: 0;
    pointer-events: none;
}

.back-to-top:not([hidden]) {
    opacity: 1;
    pointer-events: auto;
}

.back-to-top:hover {
    background-color: var(--color-primary-dark);
    transform: translateY(-4px);
    box-shadow: 0 6px 16px var(--color-shadow-hover);
}

.back-to-top:focus {
    outline: 2px solid var(--color-primary);
    outline-offset: 4px;
}

/* ===================================
   Animaciones de Scroll
   =================================== */

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

.fade-in-up {
    animation: fadeInUp 0.6s ease-out;
}

/* ===================================
   Accesibilidad
   =================================== */

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

/* Focus visible para teclado */
:focus-visible {
    outline: 2px solid var(--color-primary);
    outline-offset: 2px;
    border-radius: var(--radius-sm);
}

/* Skip to main content (accesibilidad) */
.skip-link {
    position: absolute;
    top: -40px;
    left: 0;
    background: var(--color-primary);
    color: white;
    padding: 8px;
    text-decoration: none;
    z-index: 100;
}

.skip-link:focus {
    top: 0;
}