/* ============================================
   VALZZA TELECOM - Estilos CSS
   Mobile-first · Sin frameworks
   
   COLORES EDITABLES (buscar :root)
   TIPOGRAFÍAS EDITABLES (buscar font-family)
============================================= */

/* ----------------------------------------
   VARIABLES CSS - FÁCIL DE EDITAR
---------------------------------------- */
:root {
    /* === COLORES PRINCIPALES === */
    --color-primary: #0a0f1a;       /* Fondo oscuro principal */
    --color-secondary: #111827;      /* Fondo oscuro secundario */
    --color-accent: #22c55e;         /* Verde - CTAs principales */
    --color-accent-hover: #16a34a;   /* Verde hover */
    --color-highlight: #3b82f6;      /* Azul - Destacados */
    --color-whatsapp: #25d366;       /* Verde WhatsApp */
    --color-whatsapp-hover: #128c7e; /* Verde WhatsApp hover */
    
    /* === COLORES DE TEXTO === */
    --text-primary: #f8fafc;         /* Texto claro */
    --text-secondary: #94a3b8;       /* Texto gris claro */
    --text-muted: #64748b;           /* Texto gris */
    --text-dark: #0f172a;            /* Texto oscuro (fondos claros) */
    
    /* === COLORES DE TARJETAS === */
    --card-bg: #1e293b;              /* Fondo tarjeta oscura */
    --card-bg-light: #ffffff;        /* Fondo tarjeta clara */
    --card-border: #334155;          /* Borde tarjeta */
    --card-border-light: #e2e8f0;    /* Borde tarjeta clara */
    
    /* === ESPACIADOS === */
    --space-xs: 4px;
    --space-sm: 8px;
    --space-md: 16px;
    --space-lg: 24px;
    --space-xl: 32px;
    --space-2xl: 48px;
    --space-3xl: 64px;
    
    /* === TIPOGRAFÍA === */
    --font-main: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, Oxygen, Ubuntu, sans-serif;
    --font-display: 'Segoe UI', -apple-system, BlinkMacSystemFont, sans-serif;
    
    /* === BORDES Y SOMBRAS === */
    --radius-sm: 8px;
    --radius-md: 12px;
    --radius-lg: 16px;
    --radius-full: 999px;
    
    --shadow-sm: 0 1px 2px rgba(0,0,0,0.1);
    --shadow-md: 0 4px 12px rgba(0,0,0,0.15);
    --shadow-lg: 0 8px 24px rgba(0,0,0,0.2);
    --shadow-glow: 0 0 20px rgba(34, 197, 94, 0.3);
    
    /* === TRANSICIONES === */
    --transition-fast: 0.15s ease;
    --transition-normal: 0.25s ease;
    --transition-slow: 0.4s ease;
}

/* ----------------------------------------
   RESET Y BASE
---------------------------------------- */
*, *::before, *::after {
    box-sizing: border-box;
    margin: 0;
    padding: 0;
}

html {
    scroll-behavior: smooth;
    -webkit-text-size-adjust: 100%;
}

body {
    font-family: var(--font-main);
    font-size: 16px;
    line-height: 1.5;
    color: var(--text-primary);
    background-color: var(--color-primary);
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
}

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

a {
    color: inherit;
    text-decoration: none;
}

ul, ol {
    list-style: none;
}

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

/* ----------------------------------------
   UTILIDADES
---------------------------------------- */
.container {
    width: 100%;
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 var(--space-md);
}

.muted {
    color: var(--text-muted);
    font-size: 14px;
}

.highlight {
    color: var(--color-accent);
}

.sr-only {
    position: absolute;
    width: 1px;
    height: 1px;
    padding: 0;
    margin: -1px;
    overflow: hidden;
    clip: rect(0, 0, 0, 0);
    border: 0;
}

/* ----------------------------------------
   BOTONES
---------------------------------------- */
.btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: var(--space-sm);
    padding: 12px 20px;
    font-size: 15px;
    font-weight: 600;
    border-radius: var(--radius-md);
    border: 2px solid transparent;
    cursor: pointer;
    transition: all var(--transition-fast);
    white-space: nowrap;
}

.btn__icon {
    font-size: 18px;
}

/* Botón primario - Verde */
.btn--primary {
    background: var(--color-accent);
    color: #fff;
    border-color: var(--color-accent);
}

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

/* Botón secundario - Outline */
.btn--secondary {
    background: transparent;
    color: var(--text-primary);
    border-color: var(--card-border);
}

.btn--secondary:hover {
    border-color: var(--text-primary);
    background: rgba(255,255,255,0.05);
}

/* Botón outline */
.btn--outline {
    background: transparent;
    color: var(--color-accent);
    border-color: var(--color-accent);
}

.btn--outline:hover {
    background: var(--color-accent);
    color: #fff;
}

/* Botón ghost */
.btn--ghost {
    background: transparent;
    color: var(--text-secondary);
    border-color: transparent;
    padding: var(--space-sm) var(--space-md);
}

.btn--ghost:hover {
    color: var(--text-primary);
}

/* Botón WhatsApp */
.btn--whatsapp {
    background: var(--color-whatsapp);
    color: #fff;
    border-color: var(--color-whatsapp);
}

.btn--whatsapp:hover {
    background: var(--color-whatsapp-hover);
    border-color: var(--color-whatsapp-hover);
    transform: translateY(-2px);
    box-shadow: 0 0 20px rgba(37, 211, 102, 0.4);
}

/* Tamaños */
.btn--large {
    padding: 16px 28px;
    font-size: 17px;
}

.btn--block {
    width: 100%;
}

/* ----------------------------------------
   HEADER
---------------------------------------- */
.header {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    z-index: 1000;
    background: rgba(10, 15, 26, 0.95);
    backdrop-filter: blur(10px);
    border-bottom: 1px solid var(--card-border);
    padding: var(--space-md) 0;
    transition: all var(--transition-normal);
}

.header--scrolled {
    padding: var(--space-sm) 0;
    box-shadow: var(--shadow-md);
}

.header__inner {
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: var(--space-md);
}

.header__logo {
    font-family: var(--font-display);
    font-size: 24px;
    font-weight: 800;
    color: var(--text-primary);
    letter-spacing: -0.5px;
}

.header__nav {
    display: none;
    gap: var(--space-lg);
}

.header__link {
    font-size: 14px;
    font-weight: 500;
    color: var(--text-secondary);
    transition: color var(--transition-fast);
}

.header__link:hover {
    color: var(--text-primary);
}

.header__cta {
    display: none;
}

/* Hamburguesa */
.header__burger {
    display: flex;
    flex-direction: column;
    gap: 5px;
    padding: var(--space-sm);
}

.header__burger span {
    display: block;
    width: 24px;
    height: 2px;
    background: var(--text-primary);
    border-radius: 2px;
    transition: all var(--transition-fast);
}

.header__burger.active span:nth-child(1) {
    transform: rotate(45deg) translate(5px, 5px);
}

.header__burger.active span:nth-child(2) {
    opacity: 0;
}

.header__burger.active span:nth-child(3) {
    transform: rotate(-45deg) translate(5px, -5px);
}

/* Menú móvil abierto */
.header__nav.active {
    display: flex;
    flex-direction: column;
    position: absolute;
    top: 100%;
    left: 0;
    right: 0;
    background: var(--color-primary);
    border-bottom: 1px solid var(--card-border);
    padding: var(--space-lg);
    gap: var(--space-md);
}

/* ----------------------------------------
   HERO
---------------------------------------- */
.hero {
    position: relative;
    min-height: 100vh;
    min-height: 100dvh;
    display: flex;
    align-items: center;
    padding: 100px var(--space-md) var(--space-2xl);
    overflow: hidden;
}

.hero__bg {
    position: absolute;
    inset: 0;
    background: 
        radial-gradient(ellipse at 20% 50%, rgba(34, 197, 94, 0.08) 0%, transparent 50%),
        radial-gradient(ellipse at 80% 20%, rgba(59, 130, 246, 0.08) 0%, transparent 50%),
        linear-gradient(180deg, var(--color-primary) 0%, var(--color-secondary) 100%);
    z-index: -1;
}

.hero__content {
    width: 100%;
    text-align: center;
}

.hero__badge {
    display: inline-block;
    padding: var(--space-sm) var(--space-md);
    background: rgba(34, 197, 94, 0.1);
    border: 1px solid rgba(34, 197, 94, 0.3);
    border-radius: var(--radius-full);
    font-size: 13px;
    font-weight: 600;
    color: var(--color-accent);
    margin-bottom: var(--space-lg);
    animation: fadeInUp 0.6s ease;
}

.hero__title {
    font-family: var(--font-display);
    font-size: clamp(32px, 8vw, 56px);
    font-weight: 800;
    line-height: 1.1;
    letter-spacing: -1px;
    margin-bottom: var(--space-md);
    animation: fadeInUp 0.6s ease 0.1s both;
}

.hero__subtitle {
    font-size: clamp(16px, 4vw, 20px);
    color: var(--text-secondary);
    max-width: 500px;
    margin: 0 auto var(--space-xl);
    animation: fadeInUp 0.6s ease 0.2s both;
}

.hero__ctas {
    display: flex;
    flex-direction: column;
    gap: var(--space-md);
    margin-bottom: var(--space-xl);
    animation: fadeInUp 0.6s ease 0.3s both;
}

.hero__trust {
    display: flex;
    flex-wrap: wrap;
    justify-content: center;
    gap: var(--space-md) var(--space-xl);
    animation: fadeInUp 0.6s ease 0.4s both;
}

.trust-item {
    display: flex;
    align-items: center;
    gap: var(--space-sm);
    font-size: 14px;
    color: var(--text-secondary);
}

.trust-item__icon {
    font-size: 18px;
}

/* ----------------------------------------
   SECCIONES
---------------------------------------- */
.section {
    padding: var(--space-3xl) 0;
}

.section--dark {
    background: var(--color-secondary);
}

.section--accent {
    background: linear-gradient(135deg, #0f172a 0%, #1e3a5f 100%);
}

.section--cta {
    background: linear-gradient(135deg, var(--color-accent) 0%, #16a34a 100%);
    padding: var(--space-3xl) 0;
}

.section__header {
    text-align: center;
    margin-bottom: var(--space-xl);
}

.section__tag {
    display: inline-block;
    padding: var(--space-xs) var(--space-md);
    background: rgba(255,255,255,0.1);
    border-radius: var(--radius-full);
    font-size: 14px;
    font-weight: 600;
    margin-bottom: var(--space-md);
}

.section__title {
    font-family: var(--font-display);
    font-size: clamp(24px, 5vw, 36px);
    font-weight: 700;
    margin-bottom: var(--space-sm);
}

.section__subtitle {
    font-size: 16px;
    color: var(--text-secondary);
    max-width: 600px;
    margin: 0 auto;
}

.section__footer {
    text-align: center;
    margin-top: var(--space-xl);
}

/* ----------------------------------------
   GRID DE TARJETAS
---------------------------------------- */
.cards-grid {
    display: grid;
    gap: var(--space-md);
}

/* ----------------------------------------
   TARJETAS
---------------------------------------- */
.card {
    background: var(--card-bg);
    border: 1px solid var(--card-border);
    border-radius: var(--radius-lg);
    padding: var(--space-lg);
    position: relative;
    transition: all var(--transition-normal);
}

.card:hover {
    transform: translateY(-4px);
    box-shadow: var(--shadow-lg);
}

/* Tarjeta destacada */
.card--featured {
    border-color: var(--color-accent);
    background: linear-gradient(180deg, rgba(34, 197, 94, 0.08) 0%, var(--card-bg) 100%);
}

.card--featured:hover {
    box-shadow: var(--shadow-glow);
}

.card__ribbon {
    position: absolute;
    top: -1px;
    left: 50%;
    transform: translateX(-50%);
    background: var(--color-accent);
    color: #fff;
    font-size: 12px;
    font-weight: 700;
    padding: var(--space-xs) var(--space-md);
    border-radius: 0 0 var(--radius-sm) var(--radius-sm);
}

.card__header {
    margin-bottom: var(--space-md);
}

.card__tag {
    display: inline-block;
    padding: 2px 8px;
    background: rgba(255,255,255,0.1);
    border-radius: var(--radius-sm);
    font-size: 11px;
    font-weight: 600;
    text-transform: uppercase;
    letter-spacing: 0.5px;
    color: var(--text-secondary);
    margin-bottom: var(--space-sm);
}

.card__tag--accent {
    background: rgba(34, 197, 94, 0.15);
    color: var(--color-accent);
}

.card__title {
    font-size: 24px;
    font-weight: 700;
}

.card__title-sm {
    font-size: 18px;
    font-weight: 600;
    margin-bottom: var(--space-sm);
}

.card__speed {
    font-size: 14px;
    color: var(--text-muted);
    margin-top: var(--space-xs);
}

.card__price {
    margin-bottom: var(--space-md);
}

.card__price--sm {
    margin-bottom: var(--space-sm);
}

.card__from {
    display: block;
    font-size: 12px;
    color: var(--text-muted);
}

.card__amount {
    font-size: 36px;
    font-weight: 800;
    color: var(--text-primary);
}

.card__period {
    font-size: 14px;
    color: var(--text-muted);
}

.card__features {
    margin-bottom: var(--space-lg);
}

.card__features li {
    padding: var(--space-xs) 0;
    font-size: 14px;
    color: var(--text-secondary);
}

.card__features li.muted {
    color: var(--text-muted);
}

/* Tarjeta compacta (TV) */
.card--compact {
    padding: var(--space-md);
    text-align: center;
}

.card--compact .card__amount {
    font-size: 28px;
}

.card--featured-sm {
    border-color: var(--color-highlight);
}

/* Tarjeta horizontal (Energía) */
.card--horizontal {
    display: flex;
    flex-direction: column;
    gap: var(--space-lg);
}

.card__content {
    flex: 1;
}

.card__features--inline {
    display: flex;
    flex-wrap: wrap;
    gap: var(--space-md);
    margin-top: var(--space-md);
    margin-bottom: 0;
}

.card__action {
    display: flex;
    flex-direction: column;
    align-items: flex-start;
    gap: var(--space-md);
}

/* ----------------------------------------
   CTA BOX
---------------------------------------- */
.cta-box {
    text-align: center;
    max-width: 600px;
    margin: 0 auto;
}

.cta-box__title {
    font-size: clamp(28px, 6vw, 40px);
    font-weight: 800;
    color: #fff;
    margin-bottom: var(--space-md);
}

.cta-box__text {
    font-size: 18px;
    color: rgba(255,255,255,0.9);
    margin-bottom: var(--space-xl);
}

.cta-box__buttons {
    display: flex;
    flex-direction: column;
    gap: var(--space-md);
    margin-bottom: var(--space-lg);
}

.cta-box__buttons .btn--whatsapp {
    background: #fff;
    color: var(--color-whatsapp);
}

.cta-box__buttons .btn--whatsapp:hover {
    background: rgba(255,255,255,0.9);
    transform: translateY(-2px);
}

.cta-box__buttons .btn--secondary {
    background: transparent;
    color: #fff;
    border-color: rgba(255,255,255,0.3);
}

.cta-box__buttons .btn--secondary:hover {
    background: rgba(255,255,255,0.1);
    border-color: #fff;
}

.cta-box__disclaimer {
    font-size: 14px;
    color: rgba(255,255,255,0.7);
}

/* ----------------------------------------
   FOOTER
---------------------------------------- */
.footer {
    background: #020617;
    padding: var(--space-2xl) 0 var(--space-lg);
    border-top: 1px solid var(--card-border);
}

.footer__grid {
    display: grid;
    gap: var(--space-xl);
    margin-bottom: var(--space-xl);
}

.footer__logo {
    font-size: 24px;
    font-weight: 800;
    display: block;
    margin-bottom: var(--space-sm);
}

.footer__tagline {
    color: var(--text-muted);
    font-size: 14px;
}

.footer__links h4,
.footer__contact h4 {
    font-size: 14px;
    font-weight: 600;
    margin-bottom: var(--space-md);
    color: var(--text-secondary);
}

.footer__links a,
.footer__contact a,
.footer__contact p {
    display: block;
    font-size: 14px;
    color: var(--text-muted);
    margin-bottom: var(--space-sm);
    transition: color var(--transition-fast);
}

.footer__links a:hover,
.footer__contact a:hover {
    color: var(--text-primary);
}

.footer__bottom {
    padding-top: var(--space-lg);
    border-top: 1px solid var(--card-border);
}

.footer__bottom p {
    font-size: 12px;
    color: var(--text-muted);
    text-align: center;
}

/* ----------------------------------------
   BOTÓN FLOTANTE WHATSAPP
---------------------------------------- */
.fab-whatsapp {
    position: fixed;
    bottom: var(--space-lg);
    right: var(--space-md);
    z-index: 999;
    display: flex;
    align-items: center;
    gap: var(--space-sm);
    background: var(--color-whatsapp);
    color: #fff;
    padding: 14px 20px;
    border-radius: var(--radius-full);
    font-weight: 600;
    font-size: 15px;
    box-shadow: 0 4px 20px rgba(37, 211, 102, 0.4);
    transition: all var(--transition-normal);
    animation: fabPulse 2s ease-in-out infinite;
}

.fab-whatsapp:hover {
    transform: scale(1.05);
    box-shadow: 0 6px 30px rgba(37, 211, 102, 0.5);
}

.fab-whatsapp__icon {
    font-size: 22px;
}

.fab-whatsapp__text {
    display: none;
}

/* ----------------------------------------
   ANIMACIONES
---------------------------------------- */
@keyframes fadeInUp {
    from {
        opacity: 0;
        transform: translateY(20px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

@keyframes fabPulse {
    0%, 100% {
        box-shadow: 0 4px 20px rgba(37, 211, 102, 0.4);
    }
    50% {
        box-shadow: 0 4px 30px rgba(37, 211, 102, 0.6);
    }
}

/* ----------------------------------------
   RESPONSIVE - TABLET (768px+)
---------------------------------------- */
@media (min-width: 768px) {
    .container {
        padding: 0 var(--space-lg);
    }
    
    /* Header */
    .header__nav {
        display: flex;
    }
    
    .header__burger {
        display: none;
    }
    
    .header__cta {
        display: inline-flex;
    }
    
    /* Hero */
    .hero__ctas {
        flex-direction: row;
        justify-content: center;
    }
    
    /* Cards Grid */
    .cards-grid {
        grid-template-columns: repeat(2, 1fr);
        gap: var(--space-lg);
    }
    
    .cards-grid--3 {
        grid-template-columns: repeat(3, 1fr);
    }
    
    .cards-grid--4 {
        grid-template-columns: repeat(2, 1fr);
    }
    
    /* Card horizontal */
    .card--horizontal {
        flex-direction: row;
        align-items: center;
    }
    
    .card__action {
        align-items: flex-end;
        text-align: right;
    }
    
    /* CTA Box */
    .cta-box__buttons {
        flex-direction: row;
        justify-content: center;
    }
    
    /* Footer */
    .footer__grid {
        grid-template-columns: 2fr 1fr 1fr;
    }
    
    /* FAB WhatsApp */
    .fab-whatsapp__text {
        display: inline;
    }
}

/* ----------------------------------------
   RESPONSIVE - DESKTOP (1024px+)
---------------------------------------- */
@media (min-width: 1024px) {
    /* Cards Grid */
    .cards-grid {
        grid-template-columns: repeat(3, 1fr);
    }
    
    .cards-grid--4 {
        grid-template-columns: repeat(4, 1fr);
    }
    
    .cards-grid--2 {
        grid-template-columns: repeat(2, 1fr);
        max-width: 800px;
        margin: 0 auto;
    }
    
    /* Secciones */
    .section {
        padding: var(--space-3xl) 0;
    }
    
    /* FAB */
    .fab-whatsapp {
        bottom: var(--space-xl);
        right: var(--space-xl);
    }
}

/* ----------------------------------------
   RESPONSIVE - LARGE DESKTOP (1200px+)
---------------------------------------- */
@media (min-width: 1200px) {
    .hero__title {
        font-size: 64px;
    }
    
    .cards-grid {
        gap: var(--space-xl);
    }
}

/* ----------------------------------------
   PREFERENCIAS DE USUARIO
---------------------------------------- */
@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;
    }
}

/* ----------------------------------------
   MODO CLARO (OPCIONAL - para secciones)
---------------------------------------- */
.section--light {
    background: #f8fafc;
    color: var(--text-dark);
}

.section--light .section__subtitle,
.section--light .card__features li,
.section--light .muted {
    color: #64748b;
}

.section--light .card {
    background: #fff;
    border-color: #e2e8f0;
}

.section--light .card__tag {
    background: #f1f5f9;
    color: #475569;
}

.section--light .card__tag--accent {
    background: rgba(34, 197, 94, 0.1);
    color: #16a34a;
}