/* ============================================================
   styles.css — Kairos Construcciones
   Estilo inspirado en pecam.com.ar:
   fondos oscuros dominantes, tipografía Barlow Condensed ultra-bold,
   acento dorado sobrio, secciones que alternan negro y blanco cálido.

   Estructura:
     1. Variables CSS
     2. Reset / Base
     3. Utilidades
     4. Animaciones
     5. Componentes
        5a. Navegación
        5b. Hero
        5c. Estadísticas con contador
        5d. Cards de servicios
        5e. Galería de proyectos
        5f. Proceso de trabajo
        5g. Formulario de contacto
        5h. Modal de imagen
        5i. Botón flotante WhatsApp
     6. Responsive
   ============================================================ */


/* ============================================================
   1. VARIABLES CSS
   ============================================================ */
:root {
    /* Colores — sincronizados con tailwind.config.js */
    --color-primary:       #a07030;
    --color-primary-light: #c9a777;
    --color-primary-dark:  #7a5520;

    --color-dark-bg:       #111111;
    --color-dark-surface:  #1c1c1c;
    --color-dark-border:   #2e2e2e;
    --color-dark-muted:    #7a7a7a;

    --color-light-bg:      #f5f4f0;
    --color-light-surface: #ffffff;
    --color-light-border:  #e0ded8;

    --color-white:         #ffffff;
    --color-success:       #25D366;

    /* Espaciado */
    --spacing-xs:   0.5rem;
    --spacing-sm:   1rem;
    --spacing-md:   1.5rem;
    --spacing-lg:   2rem;
    --spacing-xl:   3rem;
    --spacing-2xl:  5rem;
    --spacing-3xl:  7rem;

    /* Tipografía */
    --font-display: 'Barlow Condensed', sans-serif;
    --font-body:    'Barlow', sans-serif;

    --size-xs:   0.75rem;   /* 12px */
    --size-sm:   0.875rem;  /* 14px */
    --size-base: 1rem;      /* 16px */
    --size-lg:   1.125rem;  /* 18px */
    --size-xl:   1.375rem;  /* 22px */
    --size-2xl:  1.75rem;   /* 28px */
    --size-3xl:  2.5rem;    /* 40px */
    --size-4xl:  3.5rem;    /* 56px */
    --size-5xl:  5rem;      /* 80px */
    --size-hero: clamp(3.5rem, 8vw, 7rem);

    /* Transiciones */
    --transition-fast:   80ms ease;
    --transition-base:   180ms ease;
    --transition-slow:   500ms ease;

    /* Sombras */
    --shadow-card: 0 8px 40px rgba(0,0,0,0.1);
    --shadow-btn:  0 4px 20px rgba(160,112,48,0.3);

    /* Layout */
    --nav-height:   72px;
    --container:    1320px;

    /* Z-index */
    --z-nav:   100;
    --z-fab:   200;
    --z-modal: 999;
}


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

html { scroll-behavior: smooth; }

body {
    font-family: var(--font-body);
    font-size: var(--size-base);
    line-height: 1.65;
    background: var(--color-light-bg);
    color: var(--color-dark-bg);
    overflow-x: hidden;
    -webkit-font-smoothing: antialiased;
}

img { max-width: 100%; display: block; }
a   { text-decoration: none; color: inherit; }

h1, h2, h3, h4 {
    font-family: var(--font-display);
    font-weight: 700;
    line-height: 1.05;
    letter-spacing: -0.01em;
}


/* ============================================================
   3. UTILIDADES
   ============================================================ */

.container-custom {
    max-width: var(--container);
    margin: 0 auto;
    padding: 0 var(--spacing-lg);
}

.section-dark  { background: #ffffff; color: var(--color-dark-bg); }
.section-mid   { background: var(--color-light-bg); color: var(--color-dark-bg); }
.section-light { background: var(--color-light-bg); color: var(--color-dark-bg); }
.section-white { background: var(--color-white); color: var(--color-dark-bg); }

/* Override Tailwind text-white inside now-light sections */
.section-dark .text-white,
.section-mid .text-white { color: var(--color-dark-bg) !important; }

/* Mobile menu button — white icon on dark nav */
#mobileMenuBtn { color: var(--color-white); }

/* Service card headings — override inline color (white on primary bg) */
.service-card h3 { color: var(--color-white) !important; }

.section-padding { padding: var(--spacing-3xl) 0; }

/* Etiqueta eyebrow para secciones */
.eyebrow {
    font-family: var(--font-body);
    font-size: var(--size-xs);
    font-weight: 600;
    text-transform: uppercase;
    letter-spacing: 0.2em;
    color: var(--color-primary);
    display: block;
    margin-bottom: var(--spacing-sm);
}

/* Título de sección — display condensed */
.section-title {
    font-family: var(--font-display);
    font-size: var(--size-4xl);
    font-weight: 700;
    line-height: 1.0;
    letter-spacing: -0.01em;
}

/* Línea decorativa bajo títulos */
.title-line {
    display: block;
    width: 48px;
    height: 3px;
    background: var(--color-primary);
    margin-top: var(--spacing-sm);
}

/* ── Botones ── */
.btn-base {
    font-family: var(--font-body);
    font-weight: 600;
    font-size: var(--size-sm);
    text-transform: uppercase;
    letter-spacing: 0.12em;
    padding: 0.85rem 2.25rem;
    border: none;
    cursor: pointer;
    transition: all var(--transition-base);
    display: inline-flex;
    align-items: center;
    gap: var(--spacing-xs);
}

.btn-primary {
    background: var(--color-primary);
    color: var(--color-white);
}
.btn-primary:hover {
    /* background: var(--color-primary-light); */
    transform: translateY(-2px);
    box-shadow: var(--shadow-btn);
}
.btn-primary:active { transform: translateY(0); }

.btn-outline {
    background: transparent;
    color: var(--color-white);
    border: 1px solid rgba(255,255,255,0.6);
}
.btn-outline:hover {
    border-color: var(--color-primary);
    color: var(--color-primary);
}

/* ── Input / Textarea ── */
.form-input {
    width: 100%;
    padding: 0.875rem var(--spacing-sm);
    background: var(--color-light-surface);
    border: 1px solid var(--color-light-border);
    color: var(--color-dark-bg);
    font-family: var(--font-body);
    font-size: var(--size-base);
    transition: border-color var(--transition-base);
    outline: none;
}
.form-input::placeholder { color: #aaa; }
.form-input:focus        { border-color: var(--color-primary); }


/* ============================================================
   4. ANIMACIONES
   ============================================================ */
@keyframes fadeIn {
    from { opacity: 0; }
    to   { opacity: 1; }
}

@keyframes slideUp {
    from { opacity: 0; transform: translateY(40px); }
    to   { opacity: 1; transform: translateY(0);    }
}

@keyframes lineGrow {
    from { width: 0; }
    to   { width: 48px; }
}

.animate-fade-in  { animation: fadeIn  0.4s ease-out both; }
.animate-slide-up { animation: slideUp 0.45s ease-out both; }

/* Elementos animados por IntersectionObserver */
.js-reveal {
    opacity: 0;
    transform: translateY(36px);
    transition: opacity 0.35s ease, transform 0.35s ease;
}
.js-reveal.visible {
    opacity: 1;
    transform: translateY(0);
}


/* ============================================================
   5. COMPONENTES
   ============================================================ */

/* ── 5a. Navegación ─────────────────────────────── */
.nav-fixed {
    position: fixed;
    top: 0;
    width: 100%;
    z-index: var(--z-nav);
    height: var(--nav-height);
    display: flex;
    align-items: center;
    background: rgba(17,17,17,0.92);
    backdrop-filter: blur(12px);
    -webkit-backdrop-filter: blur(12px);
    border-bottom: 1px solid var(--color-dark-border);
    transition: background var(--transition-base);
}

.nav-logo {
    font-family: var(--font-display);
    font-size: var(--size-2xl);
    font-weight: 700;
    color: var(--color-white);
    letter-spacing: 0.04em;
    line-height: 1;
}

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

.nav-link {
    font-size: var(--size-xs);
    font-weight: 600;
    text-transform: uppercase;
    letter-spacing: 0.14em;
    color: rgba(255,255,255,0.7);
    transition: color var(--transition-fast);
    padding: 0.25rem 0;
    position: relative;
}
.nav-link::after {
    content: '';
    position: absolute;
    bottom: -2px;
    left: 0;
    width: 0;
    height: 1px;
    background: var(--color-primary);
    transition: width var(--transition-base);
}
.nav-link:hover { color: var(--color-white); }
.nav-link:hover::after { width: 100%; }


/* ── Mobile menu drawer ─────────────────────────── */
.mobile-menu {
    position: fixed;
    top: var(--nav-height);
    left: 0;
    right: 0;
    background: var(--color-dark-bg);
    z-index: calc(var(--z-nav) - 1);
    transform: translateY(-8px);
    opacity: 0;
    pointer-events: none;
    transition: transform 0.28s cubic-bezier(0.4, 0, 0.2, 1),
                opacity   0.28s ease;
    border-top: 1px solid var(--color-dark-border);
    border-bottom: 1px solid var(--color-dark-border);
    box-shadow: 0 12px 32px rgba(0,0,0,0.35);
}
.mobile-menu.active {
    transform: translateY(0);
    opacity: 1;
    pointer-events: auto;
}

.mobile-menu-inner {
    padding: var(--spacing-lg) var(--spacing-lg) var(--spacing-xl);
    display: flex;
    flex-direction: column;
    gap: var(--spacing-lg);
}

.mobile-menu-links {
    list-style: none;
    display: flex;
    flex-direction: column;
}

.mobile-menu-link {
    display: block;
    font-family: var(--font-display);
    font-size: var(--size-2xl);
    font-weight: 800;
    text-transform: uppercase;
    color: var(--color-white);
    padding: 0.65rem 0;
    border-bottom: 1px solid var(--color-dark-border);
    transition: color var(--transition-fast), padding-left var(--transition-base);
    letter-spacing: -0.01em;
    line-height: 1.1;
}
.mobile-menu-link:hover {
    color: var(--color-primary);
    padding-left: var(--spacing-sm);
}

.mobile-menu-cta {
    align-self: flex-start;
}


/* ── 5b. Hero ───────────────────────────────────── */
.hero-section {
    position: relative;
    height: 100vh;
    min-height: 640px;
    margin-top: var(--nav-height);
    display: flex;
    align-items: flex-end;
    overflow: hidden;
    background: var(--color-light-bg);
}

/* Imagen de fondo del hero */
.hero-bg {
    position: absolute;
    inset: 0;
    background-size: cover;
    background-position: center;
    filter: brightness(0.45);
    transition: transform 8s ease;
}

/* Gradiente que refuerza la legibilidad del texto en la parte inferior */
.hero-gradient {
    position: absolute;
    inset: 0;
    background: linear-gradient(
        to top,
        rgba(17,17,17,0.95) 0%,
        rgba(17,17,17,0.3)  55%,
        rgba(17,17,17,0.1)  100%
    );
}

.hero-content {
    position: relative;
    z-index: 2;
    padding-bottom: var(--spacing-3xl);
    padding-left: var(--spacing-lg);
    padding-right: var(--spacing-lg);
    max-width: var(--container);
    margin: 0 auto;
    width: 100%;
}

.hero-eyebrow {
    font-size: var(--size-xs);
    font-weight: 600;
    text-transform: uppercase;
    letter-spacing: 0.22em;
    color: var(--color-primary);
    display: flex;
    align-items: center;
    gap: 0.75rem;
    margin-bottom: var(--spacing-md);
}
.hero-eyebrow::before {
    content: '';
    display: block;
    width: 32px;
    height: 1px;
    background: var(--color-primary);
}

.hero-title {
    font-family: var(--font-display);
    font-size: var(--size-hero);
    font-weight: 800;
    line-height: 0.95;
    color: var(--color-white);
    text-transform: uppercase;
    letter-spacing: -0.02em;
    max-width: 780px;
    margin-bottom: var(--spacing-xl);
}

.hero-title em {
    font-style: normal;
    color: var(--color-primary);
}

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

/* Scroll indicator */
.scroll-hint {
    position: absolute;
    bottom: var(--spacing-lg);
    right: var(--spacing-lg);
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 6px;
    color: rgba(255,255,255,0.4);
    font-size: var(--size-xs);
    text-transform: uppercase;
    letter-spacing: 0.18em;
    z-index: 2;
}
.scroll-hint-line {
    width: 1px;
    height: 48px;
    background: linear-gradient(to bottom, rgba(255,255,255,0.4), transparent);
}


/* ── 5c. Estadísticas ───────────────────────────── */
.stats-bar {
    background: var(--color-dark-bg);
    border-top: 2px solid var(--color-primary);
    border-bottom: 1px solid var(--color-dark-border);
    padding: var(--spacing-2xl) 0;
}

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

.stat-number {
    font-family: var(--font-display);
    font-size: var(--size-5xl);
    font-weight: 800;
    color: var(--color-primary);
    line-height: 1;
    display: block;
    letter-spacing: -0.03em;
}

.stat-unit {
    font-family: var(--font-display);
    font-size: var(--size-3xl);
    font-weight: 700;
    color: var(--color-primary);
    vertical-align: super;
    font-size: 55%;
}

.stat-label {
    display: block;
    margin-top: 0.5rem;
    font-size: var(--size-xs);
    font-weight: 600;
    text-transform: uppercase;
    letter-spacing: 0.18em;
    color: var(--color-dark-muted);
}


/* ── 5d. Cards de servicios ─────────────────────── */
.service-card {
    padding: var(--spacing-2xl) var(--spacing-xl);
    /* border: 1px solid var(--color-primary-dark); */
    background: var(--color-primary);
    transition: border-color var(--transition-base),
                transform var(--transition-base),
                box-shadow var(--transition-base);
    position: relative;
    overflow: hidden;
}
.service-card::before {
    content: '';
    position: absolute;
    inset: 0;
    background: linear-gradient(135deg, var(--color-primary-dark), transparent);
    opacity: 0;
    transition: opacity var(--transition-base);
}


.service-card:hover {
    /* border-color: var(--color-primary-dark); */
    transform: translateY(-4px);
    box-shadow: var(--shadow-btn);
}

/* .service-card:hover::before { opacity: 1; } */

.service-icon {
    font-size: 2.5rem;
    color: var(--color-white);
    margin-bottom: var(--spacing-lg);
    display: block;
    line-height: 1;
}

.service-number {
    font-family: var(--font-display);
    font-size: var(--size-5xl);
    font-weight: 800;
    color: rgba(255,255,255,0.18);
    position: absolute;
    top: var(--spacing-md);
    right: var(--spacing-lg);
    line-height: 1;
    letter-spacing: -0.04em;
    transition: color var(--transition-base);
    user-select: none;
}
.service-card:hover .service-number { color: rgba(255,255,255,0.1); }

/* Text inside primary-bg service cards */
.service-card h3 { color: var(--color-white) !important; }
.service-card p  { color: rgba(255,255,255,0.78) !important; }


/* ── 5e. Galería de proyectos ───────────────────── */
.project-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    grid-template-rows: auto;
    gap: 2px;
}

/* Card grande (primer proyecto, ocupa 2 columnas y 2 filas) */
.project-item {
    position: relative;
    overflow: hidden;
    cursor: pointer;
    aspect-ratio: 4/3;
    background: var(--color-light-border);
}

.project-item.featured {
    grid-column: span 2;
    grid-row: span 2;
    aspect-ratio: auto;
}

.project-item img {
    width: 100%;
    height: 100%;
    object-fit: cover;
    transition: transform var(--transition-slow);
    filter: brightness(0.75);
}

.project-item:hover img {
    transform: scale(1.06);
    filter: brightness(0.6);
}

.project-overlay {
    position: absolute;
    inset: 0;
    padding: var(--spacing-lg);
    display: flex;
    flex-direction: column;
    justify-content: flex-end;
    background: linear-gradient(to top, rgba(17,17,17,0.85) 0%, transparent 60%);
    transition: background var(--transition-base);
}

.project-category {
    font-size: var(--size-xs);
    font-weight: 600;
    text-transform: uppercase;
    letter-spacing: 0.18em;
    color: var(--color-primary);
    margin-bottom: 0.35rem;
    transform: translateY(8px);
    opacity: 0;
    transition: all var(--transition-base);
}

.project-title {
    font-family: var(--font-display);
    font-size: var(--size-xl);
    font-weight: 700;
    color: var(--color-white);
    text-transform: uppercase;
    letter-spacing: 0.02em;
}

.project-item.featured .project-title {
    font-size: var(--size-3xl);
}

.project-item:hover .project-category {
    opacity: 1;
    transform: translateY(0);
}


/* ── 5f. Proceso de trabajo ─────────────────────── */
.process-step {
    display: grid;
    grid-template-columns: 80px 1fr;
    gap: var(--spacing-xl);
    padding: var(--spacing-xl) 0;
    border-bottom: 1px solid var(--color-light-border);
    align-items: start;
}
.process-step:last-child { border-bottom: none; }

.process-number {
    font-family: var(--font-display);
    font-size: var(--size-4xl);
    font-weight: 800;
    color: var(--color-light-border);
    line-height: 1;
    letter-spacing: -0.04em;
    transition: color var(--transition-base);
}
.process-step:hover .process-number { color: var(--color-primary); }

.process-content { padding-top: 0.25rem; }

.process-img {
    width: 100%;
    margin-top: var(--spacing-lg);
    aspect-ratio: 16/7;
    object-fit: cover;
}


/* ── 5g. Formulario de contacto ─────────────────── */
.contact-grid {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 0;
}

.contact-info {
    background: var(--color-primary);
    color: var(--color-white);
    padding: var(--spacing-3xl) var(--spacing-2xl);
    display: flex;
    flex-direction: column;
    justify-content: space-between;
}

.contact-info-title {
    font-family: var(--font-display);
    font-size: var(--size-4xl);
    font-weight: 800;
    line-height: 0.95;
    text-transform: uppercase;
}

.contact-form-panel {
    background: var(--color-white);
    padding: var(--spacing-3xl) var(--spacing-2xl);
}

.form-label {
    display: block;
    font-size: var(--size-xs);
    font-weight: 600;
    text-transform: uppercase;
    letter-spacing: 0.14em;
    color: #888;
    margin-bottom: 0.5rem;
}


/* ── 5h. Modal de imagen ────────────────────────── */
.modal {
    display: none;
    position: fixed;
    inset: 0;
    background: rgba(0,0,0,0.95);
    z-index: var(--z-modal);
    align-items: center;
    justify-content: center;
}
.modal.active { display: flex; }

.modal-img {
    max-width: 90vw;
    max-height: 88vh;
    object-fit: contain;
}

.modal-close {
    position: absolute;
    top: var(--spacing-lg);
    right: var(--spacing-lg);
    color: var(--color-white);
    font-size: 2.5rem;
    cursor: pointer;
    line-height: 1;
    transition: color var(--transition-fast);
    user-select: none;
    font-family: var(--font-display);
}
.modal-close:hover { color: var(--color-primary); }


/* ── 5i. Botón flotante WhatsApp ────────────────── */
.whatsapp-btn {
    position: fixed;
    bottom: 32px;
    right: 32px;
    background: var(--color-success);
    color: var(--color-white);
    width: 58px;
    height: 58px;
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    box-shadow: 0 4px 24px rgba(37,211,102,0.5);
    z-index: var(--z-fab);
    transition: transform var(--transition-base),
                box-shadow var(--transition-base);
}
.whatsapp-btn:hover {
    transform: scale(1.1);
    box-shadow: 0 6px 32px rgba(37,211,102,0.65);
}
.whatsapp-btn:active { transform: scale(0.95); }


/* ── Footer social icons ────────────────────────── */
.footer-social-icons {
    display: flex;
    gap: 0.65rem;
    margin-top: var(--spacing-md);
}

.footer-social-icon {
    width: 36px;
    height: 36px;
    border-radius: 50%;
    border: 1px solid var(--color-dark-border);
    display: flex;
    align-items: center;
    justify-content: center;
    color: var(--color-dark-muted);
    flex-shrink: 0;
    transition: border-color 80ms ease, color 80ms ease, background 80ms ease;
}
.footer-social-icon svg {
    width: 15px;
    height: 15px;
    fill: currentColor;
}
.footer-social-icon:hover {
    border-color: var(--color-primary);
    color: var(--color-primary);
    background: rgba(201, 167, 119, 0.08);
}


/* ── Footer ─────────────────────────────────────── */
.footer-main {
    background: #0a0a0a;
    padding: var(--spacing-3xl) 0 var(--spacing-2xl);
    border-top: 1px solid var(--color-dark-border);
}

.footer-divider {
    border: none;
    border-top: 1px solid var(--color-dark-border);
    margin: var(--spacing-xl) 0;
}

.footer-link {
    font-size: var(--size-sm);
    color: var(--color-dark-muted);
    transition: color var(--transition-fast);
}
.footer-link:hover { color: var(--color-primary); }


/* ── 5j. Sección Mantente en Contacto ──────────── */
.social-links-row {
    display: flex;
    flex-wrap: wrap;
    gap: var(--spacing-md);
    margin-bottom: var(--spacing-2xl);
    justify-content: center;
    align-items: center;
}

.social-link-card {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: 0.75rem;
    padding: 1rem 1.75rem;
    width: 200px;
    background: var(--color-primary);
    color: var(--color-white);
    font-family: var(--font-body);
    font-size: var(--size-sm);
    font-weight: 600;
    text-transform: uppercase;
    letter-spacing: 0.12em;
    transition: background 80ms ease, transform 80ms ease;
}
.social-link-card svg {
    width: 20px;
    height: 20px;
    fill: currentColor;
    flex-shrink: 0;
}
.social-link-card:hover {
    transform: translateY(-3px);
    box-shadow: var(--shadow-btn);
}

.social-subtitle {
    font-family: var(--font-display);
    font-size: var(--size-2xl);
    font-weight: 700;
    text-transform: uppercase;
    color: var(--color-dark-bg);
    margin-bottom: var(--spacing-lg);
    letter-spacing: 0.01em;
}

.youtube-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: var(--spacing-md);
}

.yt-card {
    display: block;
    background: var(--color-dark-surface);
    border: 1px solid var(--color-dark-border);
    color: var(--color-white);
    overflow: hidden;
    transition: border-color var(--transition-base),
                transform   var(--transition-base);
}
.yt-card:hover {
    border-color: var(--color-primary);
    transform: translateY(-4px);
}

.yt-thumb-wrap {
    position: relative;
    aspect-ratio: 16/9;
    overflow: hidden;
    background: #000;
}
.yt-thumb-wrap img {
    width: 100%;
    height: 100%;
    object-fit: cover;
    filter: brightness(0.85);
    transition: filter var(--transition-base),
                transform var(--transition-slow);
}
.yt-card:hover .yt-thumb-wrap img {
    filter: brightness(0.6);
    transform: scale(1.04);
}

.yt-play-btn {
    position: absolute;
    inset: 0;
    display: flex;
    align-items: center;
    justify-content: center;
    opacity: 0;
    transition: opacity var(--transition-base);
}
.yt-play-btn svg { filter: drop-shadow(0 2px 8px rgba(0,0,0,0.6)); }
.yt-card:hover .yt-play-btn { opacity: 1; }

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

.yt-title {
    font-weight: 600;
    font-size: var(--size-sm);
    line-height: 1.45;
    margin-bottom: 0.4rem;
    color: var(--color-white);
    display: -webkit-box;
    -webkit-line-clamp: 2;
    -webkit-box-orient: vertical;
    overflow: hidden;
}

.yt-date {
    font-size: var(--size-xs);
    color: var(--color-dark-muted);
    text-transform: uppercase;
    letter-spacing: 0.1em;
}

.yt-status {
    grid-column: 1 / -1;
    text-align: center;
    padding: var(--spacing-2xl) var(--spacing-xl);
    color: var(--color-dark-muted);
    font-size: var(--size-sm);
    border: 1px dashed var(--color-dark-border);
    line-height: 1.7;
}


/* ── 5k. Por qué Elegirnos ─────────────────────── */
.why-us-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: var(--spacing-md);
}

.why-us-card {
    background: var(--color-primary);
    /* border: 1px solid var(--color-primary-dark); */
    padding: var(--spacing-xl) var(--spacing-lg);
    transition: border-color var(--transition-base),
                transform   var(--transition-base),
                box-shadow  var(--transition-base);
}

.why-us-card:hover {
    border-color: var(--color-primary-dark);
    transform: translateY(-4px);
    box-shadow: 0 8px 32px rgba(0,0,0,0.2);
}

.why-us-icon {
    font-size: 2.5rem;
    color: var(--color-white);
    display: block;
    margin-bottom: var(--spacing-md);
    line-height: 1;
}

.why-us-title {
    font-family: var(--font-display);
    font-size: var(--size-xl);
    font-weight: 700;
    text-transform: uppercase;
    color: var(--color-white);
    margin-bottom: var(--spacing-sm);
    letter-spacing: 0.01em;
}

.why-us-desc {
    color: var(--color-white);
    font-size: var(--size-sm);
    line-height: 1.75;
}


/* ── 5l. Proyecto Destacado (Case Study) ──────── */
.case-study-layout {
    display: grid;
    grid-template-columns: 1.5fr 1fr;
    gap: var(--spacing-2xl);
    align-items: start;
}

.case-study-image {
    position: relative;
    overflow: hidden;
    border-radius: 2px;
}
.case-study-image img {
    width: 100%;
    height: 100%;
    object-fit: cover;
    min-height: 420px;
    transition: transform var(--transition-slow);
}
.case-study-image:hover img {
    transform: scale(1.03);
}

.case-study-name {
    font-family: var(--font-display);
    font-size: var(--size-3xl);
    font-weight: 800;
    color: var(--color-dark-bg);
    text-transform: uppercase;
    line-height: 1.05;
    margin-bottom: var(--spacing-lg);
}

.case-study-block {
    margin-bottom: var(--spacing-md);
}

.case-study-label {
    font-size: var(--size-xs);
    font-weight: 700;
    text-transform: uppercase;
    letter-spacing: 0.14em;
    color: var(--color-primary-dark);
    margin-bottom: 0.35rem;
}

.case-study-body {
    color: #555;
    font-size: var(--size-sm);
    line-height: 1.75;
}

.case-study-metrics {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: var(--spacing-sm);
    margin-top: var(--spacing-lg);
    padding-top: var(--spacing-lg);
    border-top: 1px solid var(--color-light-border);
}

.case-study-metric { text-align: center; }

.case-study-metric-value {
    font-family: var(--font-display);
    font-size: var(--size-2xl);
    font-weight: 800;
    color: var(--color-primary-dark);
    display: block;
    line-height: 1.2;
}
.case-study-metric-value small {
    font-size: 60%;
    font-weight: 700;
}

.case-study-metric-label {
    font-size: var(--size-xs);
    font-weight: 600;
    text-transform: uppercase;
    letter-spacing: 0.12em;
    color: #777;
    margin-top: 0.2rem;
    display: block;
}


/* ── 5m. Testimonios ──────────────────────────── */
.testimonials-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: var(--spacing-md);
}

.testimonial-card {
    background: var(--color-light-surface);
    border: 1px solid var(--color-light-border);
    padding: var(--spacing-xl) var(--spacing-lg);
    display: flex;
    flex-direction: column;
    gap: var(--spacing-md);
    transition: border-color var(--transition-base),
                transform   var(--transition-base);
}
.testimonial-card:hover {
    border-color: var(--color-primary);
    transform: translateY(-3px);
}

.testimonial-stars {
    color: var(--color-primary);
    font-size: var(--size-lg);
    letter-spacing: 0.1em;
}

.testimonial-text {
    color: #777;
    font-size: var(--size-sm);
    line-height: 1.8;
    font-style: italic;
    flex: 1;
}

.testimonial-author {
    display: flex;
    align-items: center;
    gap: var(--spacing-sm);
    padding-top: var(--spacing-sm);
    border-top: 1px solid var(--color-light-border);
}

.testimonial-avatar {
    width: 48px;
    height: 48px;
    border-radius: 50%;
    object-fit: cover;
    border: 2px solid var(--color-primary);
    flex-shrink: 0;
}

.testimonial-name {
    font-weight: 600;
    font-size: var(--size-sm);
    color: var(--color-dark-bg);
}

.testimonial-project {
    font-size: var(--size-xs);
    color: #888;
    text-transform: uppercase;
    letter-spacing: 0.1em;
}


/* ── 5n. Partners / Marquee ───────────────────── */
.partners-marquee {
    overflow: hidden;
    width: 100%;
    padding: var(--spacing-lg) 0 0;
}

.partners-track {
    display: flex;
    gap: var(--spacing-xl);
    animation: marquee 30s linear infinite;
    width: max-content;
}

.partner-logo {
    flex-shrink: 0;
    display: flex;
    align-items: center;
    justify-content: center;
    padding: var(--spacing-sm) var(--spacing-md);
}
.partner-logo img {
    height: 90px;
    width: auto;
    object-fit: contain;
    mix-blend-mode: multiply;
}

@keyframes marquee {
    0%   { transform: translateX(0); }
    100% { transform: translateX(-50%); }
}


/* ── 5o. Preguntas Frecuentes (FAQ) ───────────── */
.faq-list {
    display: flex;
    flex-direction: column;
    gap: 0;
}

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

.faq-question {
    width: 100%;
    background: none;
    border: none;
    color: var(--color-white);
    font-family: var(--font-body);
    font-size: var(--size-lg);
    font-weight: 600;
    text-align: left;
    padding: var(--spacing-md) 0;
    cursor: pointer;
    display: flex;
    justify-content: space-between;
    align-items: center;
    gap: var(--spacing-md);
    transition: color var(--transition-fast);
}
.faq-question:hover { 
    color: var(--color-primary-light); 
}

.faq-icon {
    font-size: 1.5rem;
    color: var(--color-primary);
    transition: transform 0.3s ease;
    flex-shrink: 0;
}
.faq-item.active .faq-icon {
    transform: rotate(45deg);
}

.faq-answer {
    max-height: 0;
    overflow: hidden;
    transition: max-height 0.3s ease;
}

.faq-answer p {
    color: #777;
    font-size: var(--size-sm);
    line-height: 1.8;
    padding-bottom: var(--spacing-md);
}


/* ── FAQ dark override (keeps section-mid siblings light) ── */
#faq {
    background: var(--color-dark-bg) !important;
    color: var(--color-white) !important;
}
#faq .faq-item {
    border-color: var(--color-dark-border);
}
#faq .faq-item:first-child {
    border-color: var(--color-dark-border);
}

#faq .faq-answer p {
    color: var(--color-dark-muted);
}
#faq .text-white {
    color: var(--color-white) !important;
}


/* ── 5p. CTA Banner ───────────────────────────── */
.cta-banner-section {
    background: var(--color-primary);
    padding: var(--spacing-3xl) 0;
}

.cta-banner-inner {
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: var(--spacing-xl);
}

.cta-banner-title {
    font-family: var(--font-display);
    font-size: var(--size-4xl);
    font-weight: 800;
    color: var(--color-dark-bg);
    text-transform: uppercase;
    line-height: 1.0;
    max-width: 600px;
}

.cta-banner-subtitle {
    color: rgba(17,17,17,0.7);
    font-size: var(--size-base);
    line-height: 1.6;
    margin-top: var(--spacing-sm);
    max-width: 520px;
}

.cta-banner-actions {
    display: flex;
    gap: var(--spacing-sm);
    flex-shrink: 0;
}

.cta-btn-dark {
    background: var(--color-dark-bg);
    color: var(--color-white);
}
.cta-btn-dark:hover {
    background: var(--color-dark-surface);
    transform: translateY(-2px);
    box-shadow: 0 4px 20px rgba(0,0,0,0.4);
}

.cta-btn-outline {
    background: transparent;
    color: var(--color-dark-bg);
    border: 2px solid var(--color-dark-bg);
}
.cta-btn-outline:hover {
    background: var(--color-dark-bg);
    color: var(--color-white);
    transform: translateY(-2px);
}


/* ============================================================
   6. RESPONSIVE
   ============================================================ */
@media (max-width: 1024px) {
    .project-grid {
        grid-template-columns: 1fr 1fr;
    }
    .project-item.featured {
        grid-column: span 2;
        aspect-ratio: 16/7;
    }
    .contact-grid {
        grid-template-columns: 1fr;
    }
    .youtube-grid { grid-template-columns: repeat(2, 1fr); }
    .yt-status    { grid-column: span 2; }

    /* Why Us: 2 columns on tablet */
    .why-us-grid { grid-template-columns: repeat(2, 1fr); }

    /* Case Study: stack on tablet */
    .case-study-layout { grid-template-columns: 1fr; }
    .case-study-image img { min-height: 320px; }

    /* Testimonials: 2 columns on tablet */
    .testimonials-grid { grid-template-columns: repeat(2, 1fr); }

    /* CTA Banner: stack on tablet */
    .cta-banner-inner {
        flex-direction: column;
        text-align: center;
        align-items: center;
    }
    .cta-banner-title { font-size: var(--size-3xl); }
}

@media (max-width: 768px) {
    :root {
        --spacing-3xl: 7rem;
        --spacing-2xl: 3rem;
    }

    .hero-title { font-size: clamp(2.8rem, 10vw, 5rem); }

    .section-title { font-size: var(--size-3xl); }

    /* ── Carrusel: Nuestras Obras ── */
    .project-grid {
        display: flex;
        overflow-x: auto;
        scroll-snap-type: x mandatory;
        -webkit-overflow-scrolling: touch;
        gap: var(--spacing-sm);
        scrollbar-width: none;
    }
    .project-grid::-webkit-scrollbar { display: none; }

    .project-item,
    .project-item.featured {
        flex: 0 0 calc(100% - 48px);
        min-width: calc(100% - 48px);
        aspect-ratio: 4/3;
        grid-column: unset;
        grid-row: unset;
        scroll-snap-align: start;
    }

    .process-step { grid-template-columns: 48px 1fr; gap: var(--spacing-md); }
    .process-number { font-size: var(--size-3xl); }

    .contact-info { padding: var(--spacing-2xl) var(--spacing-lg); }
    .contact-form-panel { padding: var(--spacing-2xl) var(--spacing-lg); }

    .stat-number { font-size: var(--size-4xl); }

    /* ── Carrusel: YouTube Feed ── */
    .youtube-grid {
        display: flex;
        overflow-x: auto;
        scroll-snap-type: x mandatory;
        -webkit-overflow-scrolling: touch;
        gap: var(--spacing-sm);
        scrollbar-width: none;
    }
    .youtube-grid::-webkit-scrollbar { display: none; }

    .yt-card {
        flex: 0 0 calc(100% - 48px);
        min-width: calc(100% - 48px);
        scroll-snap-align: start;
    }
    .yt-status {
        flex: 0 0 100%;
        min-width: 100%;
        grid-column: unset;
    }
    .social-links-row  { gap: var(--spacing-sm); }
    .social-link-card  { padding: 0.85rem 1.25rem; }

    /* Why Us: single column on mobile */
    .why-us-grid { grid-template-columns: 1fr; }

    /* Case Study metrics: 2 columns kept, smaller text */
    .case-study-name { font-size: var(--size-2xl); }
    .case-study-image img { min-height: 240px; }

    /* Testimonials: single column on mobile */
    .testimonials-grid { grid-template-columns: 1fr; }

    /* CTA Banner mobile */
    .cta-banner-inner { text-align: center; }
    .cta-banner-title { font-size: var(--size-2xl); }
    .cta-banner-actions { flex-direction: column; width: 100%; }
    .cta-banner-actions .btn-base { width: 100%; justify-content: center; }

    /* FAQ mobile */
    .faq-question { font-size: var(--size-base); }

    /* ── Partners mobile: grid instead of marquee ── */
    .partners-marquee { overflow: visible; }
    .partners-track {
        animation: none;
        flex-wrap: wrap;
        justify-content: center;
        width: 100%;
        gap: var(--spacing-md);
    }
    .partners-track [data-clone="true"] { display: none; }
    .partner-logo {
        flex: 0 0 calc(33.333% - var(--spacing-md));
        justify-content: center;
    }
    .partner-logo img { height: 60px; }

    /* ── Dots del carrusel ── */
    .carousel-dots { display: flex; }
}


/* ── Dots del carrusel (ocultos en desktop) ─────── */
.carousel-dots {
    display: none;
    justify-content: center;
    align-items: center;
    gap: 0.5rem;
    margin-top: var(--spacing-md);
}

.carousel-dot {
    width: 8px;
    height: 8px;
    border-radius: 50%;
    background: var(--color-dark-border);
    border: none;
    cursor: pointer;
    padding: 0;
    flex-shrink: 0;
    transition: background var(--transition-base), transform var(--transition-base);
}

.carousel-dot.active {
    background: var(--color-primary);
    transform: scale(1.4);
}