/* =====================================================================
   BRIAN FLORES AGUILAR — DESIGN SYSTEM
   Paleta: azul / blanco / negro. Minimalista, mucho espacio, sombras
   suaves. Inspirado en la disciplina visual de Stripe/Apple pero con
   identidad propia: acento "circuito azul" para un ingeniero de
   sistemas y automatización.
   ===================================================================== */

:root {
    /* Color */
    --color-azul:        #1E4FD9;   /* acento primario */
    --color-azul-claro:  #4F86FF;   /* hover / gradiente */
    --color-azul-glow:   rgba(30, 79, 217, 0.18);
    --color-negro:       #0A0E17;   /* fondo modo oscuro / texto modo claro */
    --color-blanco:      #FFFFFF;
    --color-gris-100:    #F4F6FA;   /* fondo suave modo claro */
    --color-gris-300:    #E4E8F0;   /* bordes modo claro */
    --color-gris-500:    #6B7280;   /* texto secundario */
    --color-gris-700:    #2B3245;

    /* Tipografía */
    --font-display: 'Space Grotesk', sans-serif;
    --font-body: 'Inter', sans-serif;
    --font-mono: 'JetBrains Mono', monospace;

    /* Layout */
    --radio: 14px;
    --radio-sm: 8px;
    --sombra-suave: 0 4px 24px rgba(10, 14, 23, 0.06);
    --sombra-media: 0 12px 40px rgba(10, 14, 23, 0.10);
    --transicion: all 0.25s cubic-bezier(0.4, 0, 0.2, 1);

    /* Tema claro (default) */
    --bg: var(--color-blanco);
    --bg-suave: var(--color-gris-100);
    --texto: var(--color-negro);
    --texto-secundario: var(--color-gris-500);
    --borde: var(--color-gris-300);
    --superficie: var(--color-blanco);
}

[data-tema="oscuro"] {
    --bg: #0A0E17;
    --bg-suave: #10151F;
    --texto: #F4F6FA;
    --texto-secundario: #9AA3B5;
    --borde: #1E2531;
    --superficie: #10151F;
    --sombra-suave: 0 4px 24px rgba(0, 0, 0, 0.3);
    --sombra-media: 0 12px 40px rgba(0, 0, 0, 0.45);
}

* { box-sizing: border-box; }

html { scroll-behavior: smooth; }

body {
    font-family: var(--font-body);
    background: var(--bg);
    color: var(--texto);
    transition: background 0.3s ease, color 0.3s ease;
    -webkit-font-smoothing: antialiased;
}

h1, h2, h3, h4, .font-display {
    font-family: var(--font-display);
    font-weight: 600;
    letter-spacing: -0.02em;
    color: var(--texto);
}

.font-mono { font-family: var(--font-mono); }

a { color: var(--color-azul); text-decoration: none; }
a:hover { color: var(--color-azul-claro); }

.text-secundario { color: var(--texto-secundario) !important; }
.bg-suave { background: var(--bg-suave) !important; }
.bg-superficie { background: var(--superficie); }

/* Respeta preferencia de movimiento reducido */
@media (prefers-reduced-motion: reduce) {
    *, *::before, *::after {
        animation-duration: 0.001ms !important;
        animation-iteration-count: 1 !important;
        transition-duration: 0.001ms !important;
        scroll-behavior: auto !important;
    }
}

/* Foco visible para accesibilidad de teclado */
a:focus-visible, button:focus-visible, input:focus-visible, textarea:focus-visible, select:focus-visible {
    outline: 2px solid var(--color-azul);
    outline-offset: 3px;
}

/* ---------------------------------------------------------------------
   NAVBAR
   --------------------------------------------------------------------- */
.navbar-bfa {
    background: color-mix(in srgb, var(--bg) 85%, transparent);
    backdrop-filter: blur(14px);
    -webkit-backdrop-filter: blur(14px);
    border-bottom: 1px solid var(--borde);
    transition: var(--transicion);
    padding: 0.9rem 0;
}

.navbar-bfa .navbar-brand {
    font-family: var(--font-display);
    font-weight: 700;
    font-size: 1.25rem;
    color: var(--texto);
    display: flex;
    align-items: center;
    gap: 0.5rem;
}

.navbar-bfa .navbar-brand .punto {
    color: var(--color-azul);
}

.navbar-bfa .nav-link {
    color: var(--texto-secundario);
    font-weight: 500;
    font-size: 0.925rem;
    padding: 0.5rem 0.9rem !important;
    position: relative;
}

.navbar-bfa .nav-link:hover,
.navbar-bfa .nav-link.active {
    color: var(--texto);
}

.btn-tema {
    border: 1px solid var(--borde);
    background: transparent;
    color: var(--texto);
    width: 40px;
    height: 40px;
    border-radius: 50%;
    display: inline-flex;
    align-items: center;
    justify-content: center;
    transition: var(--transicion);
}
.btn-tema:hover { border-color: var(--color-azul); color: var(--color-azul); }

/* ---------------------------------------------------------------------
   BOTONES
   --------------------------------------------------------------------- */
.btn-bfa-primario {
    background: var(--color-azul);
    color: #fff;
    border: none;
    padding: 0.85rem 1.75rem;
    border-radius: var(--radio-sm);
    font-weight: 600;
    transition: var(--transicion);
    box-shadow: 0 8px 20px var(--color-azul-glow);
}
.btn-bfa-primario:hover {
    background: var(--color-azul-claro);
    color: #fff;
    transform: translateY(-2px);
    box-shadow: 0 12px 28px var(--color-azul-glow);
}

.btn-bfa-secundario {
    background: transparent;
    color: var(--texto);
    border: 1.5px solid var(--borde);
    padding: 0.85rem 1.75rem;
    border-radius: var(--radio-sm);
    font-weight: 600;
    transition: var(--transicion);
}
.btn-bfa-secundario:hover {
    border-color: var(--color-azul);
    color: var(--color-azul);
    transform: translateY(-2px);
}

.btn-bfa-outline-sm {
    border: 1.5px solid var(--borde);
    color: var(--texto);
    background: transparent;
    padding: 0.45rem 1rem;
    border-radius: 999px;
    font-size: 0.85rem;
    font-weight: 600;
    transition: var(--transicion);
}
.btn-bfa-outline-sm:hover { border-color: var(--color-azul); color: var(--color-azul); }

/* ---------------------------------------------------------------------
   HERO
   --------------------------------------------------------------------- */
.hero-bfa {
    position: relative;
    padding: 9rem 0 6rem;
    overflow: hidden;
}

.hero-bfa .eyebrow {
    font-family: var(--font-mono);
    font-size: 0.8rem;
    letter-spacing: 0.12em;
    text-transform: uppercase;
    color: var(--color-azul);
    display: inline-flex;
    align-items: center;
    gap: 0.6rem;
}
.hero-bfa .eyebrow::before {
    content: '';
    width: 8px; height: 8px;
    border-radius: 50%;
    background: var(--color-azul);
    box-shadow: 0 0 0 4px var(--color-azul-glow);
    display: inline-block;
}

.hero-bfa h1 {
    font-size: clamp(2.4rem, 5vw, 4rem);
    line-height: 1.08;
    margin: 1.2rem 0 1.4rem;
}

.hero-bfa .lead {
    font-size: 1.15rem;
    color: var(--texto-secundario);
    max-width: 540px;
}

/* Grid de circuito de fondo, sutil */
.hero-circuito {
    position: absolute;
    inset: 0;
    background-image:
        linear-gradient(var(--borde) 1px, transparent 1px),
        linear-gradient(90deg, var(--borde) 1px, transparent 1px);
    background-size: 46px 46px;
    opacity: 0.35;
    mask-image: radial-gradient(ellipse 70% 60% at 50% 20%, black 10%, transparent 75%);
    -webkit-mask-image: radial-gradient(ellipse 70% 60% at 50% 20%, black 10%, transparent 75%);
    pointer-events: none;
}

/* Firma visual: pila de tarjetas de "sistema" flotando en el hero */
.hero-stack {
    position: relative;
    height: 460px;
}
.hero-stack .tarjeta-sistema {
    position: absolute;
    width: 300px;
    background: var(--superficie);
    border: 1px solid var(--borde);
    border-radius: var(--radio);
    box-shadow: var(--sombra-media);
    padding: 1.1rem 1.25rem;
    animation: flotar 6s ease-in-out infinite;
}
.hero-stack .tarjeta-sistema .barra-titulo {
    display: flex;
    gap: 6px;
    margin-bottom: 0.85rem;
}
.hero-stack .tarjeta-sistema .barra-titulo span {
    width: 9px; height: 9px; border-radius: 50%; background: var(--borde);
}
.hero-stack .tarjeta-1 { top: 10px; left: 40px; z-index: 3; animation-delay: 0s; }
.hero-stack .tarjeta-2 { top: 130px; left: 130px; z-index: 2; opacity: 0.85; animation-delay: 1.2s; }
.hero-stack .tarjeta-3 { top: 250px; left: 10px; z-index: 1; opacity: 0.65; animation-delay: 2.4s; }

.hero-stack .barra-mock { height: 8px; border-radius: 4px; background: var(--bg-suave); margin-bottom: 8px; }
.hero-stack .barra-mock.corta { width: 55%; }
.hero-stack .barra-mock.azul { background: var(--color-azul); width: 35%; }

@keyframes flotar {
    0%, 100% { transform: translateY(0); }
    50% { transform: translateY(-14px); }
}

/* ---------------------------------------------------------------------
   CONTADORES
   --------------------------------------------------------------------- */
.contador-item { text-align: center; padding: 1rem; }
.contador-numero {
    font-family: var(--font-display);
    font-size: clamp(2rem, 4vw, 3rem);
    font-weight: 700;
    color: var(--texto);
}
.contador-numero .mas { color: var(--color-azul); }
.contador-label {
    font-family: var(--font-mono);
    font-size: 0.8rem;
    text-transform: uppercase;
    letter-spacing: 0.08em;
    color: var(--texto-secundario);
}

/* ---------------------------------------------------------------------
   SECCIONES / EYEBROWS
   --------------------------------------------------------------------- */
.seccion { padding: 5.5rem 0; }
.seccion-eyebrow {
    font-family: var(--font-mono);
    font-size: 0.78rem;
    text-transform: uppercase;
    letter-spacing: 0.1em;
    color: var(--color-azul);
    margin-bottom: 0.6rem;
    display: block;
}
.seccion-titulo { font-size: clamp(1.8rem, 3vw, 2.4rem); margin-bottom: 0.75rem; }
.seccion-sub { color: var(--texto-secundario); max-width: 620px; }

/* ---------------------------------------------------------------------
   CARDS (proyectos, servicios, blog)
   --------------------------------------------------------------------- */
.card-bfa {
    background: var(--superficie);
    border: 1px solid var(--borde);
    border-radius: var(--radio);
    overflow: hidden;
    transition: var(--transicion);
    height: 100%;
}
.card-bfa:hover {
    transform: translateY(-6px);
    box-shadow: var(--sombra-media);
    border-color: var(--color-azul);
}
.card-bfa .card-bfa-img {
    aspect-ratio: 16/10;
    background: var(--bg-suave);
    display: flex;
    align-items: center;
    justify-content: center;
    color: var(--texto-secundario);
    position: relative;
    overflow: hidden;
}
.card-bfa .card-bfa-img img { width: 100%; height: 100%; object-fit: cover; }
.card-bfa .card-bfa-body { padding: 1.5rem; }
.card-bfa .badge-categoria {
    font-family: var(--font-mono);
    font-size: 0.7rem;
    text-transform: uppercase;
    letter-spacing: 0.06em;
    color: var(--color-azul);
    background: var(--color-azul-glow);
    padding: 0.3rem 0.6rem;
    border-radius: 999px;
}
.card-bfa .precio {
    font-family: var(--font-display);
    font-weight: 700;
    font-size: 1.3rem;
}
.card-bfa .precio-tachado {
    text-decoration: line-through;
    color: var(--texto-secundario);
    font-size: 0.9rem;
    font-weight: 400;
    margin-right: 0.4rem;
}

/* ---------------------------------------------------------------------
   TESTIMONIOS
   --------------------------------------------------------------------- */
.testimonio-card {
    background: var(--superficie);
    border: 1px solid var(--borde);
    border-radius: var(--radio);
    padding: 2rem;
    height: 100%;
}
.testimonio-estrellas { color: var(--color-azul); letter-spacing: 2px; }

/* ---------------------------------------------------------------------
   TIMELINE (sobre mí)
   --------------------------------------------------------------------- */
.timeline-bfa { position: relative; padding-left: 2.5rem; border-left: 2px solid var(--borde); }
.timeline-item { position: relative; padding-bottom: 2.5rem; }
.timeline-item:last-child { padding-bottom: 0; }
.timeline-item::before {
    content: '';
    position: absolute;
    left: -2.55rem;
    top: 4px;
    width: 12px; height: 12px;
    border-radius: 50%;
    background: var(--color-azul);
    box-shadow: 0 0 0 5px var(--bg);
}
.timeline-fecha { font-family: var(--font-mono); font-size: 0.8rem; color: var(--color-azul); }

/* ---------------------------------------------------------------------
   FOOTER
   --------------------------------------------------------------------- */
.footer-bfa {
    background: var(--color-negro);
    color: #C7CDDB;
    padding: 4rem 0 2rem;
}
[data-tema="oscuro"] .footer-bfa { background: #060911; }
.footer-bfa a { color: #C7CDDB; }
.footer-bfa a:hover { color: var(--color-azul-claro); }
.footer-bfa h6 {
    font-family: var(--font-display);
    color: #fff;
    font-size: 0.85rem;
    text-transform: uppercase;
    letter-spacing: 0.08em;
    margin-bottom: 1.1rem;
}
.footer-bottom { border-top: 1px solid rgba(255,255,255,0.08); padding-top: 1.5rem; margin-top: 3rem; font-size: 0.85rem; color: #8992A6; }

/* ---------------------------------------------------------------------
   BOTONES FLOTANTES DE CHAT
   --------------------------------------------------------------------- */
.chat-flotante {
    position: fixed;
    bottom: 24px;
    right: 24px;
    z-index: 1040;
    display: flex;
    flex-direction: column;
    gap: 12px;
}
.chat-flotante a {
    width: 52px; height: 52px;
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    color: #fff;
    box-shadow: var(--sombra-media);
    transition: var(--transicion);
    font-size: 1.3rem;
}
.chat-flotante a:hover { transform: scale(1.08); }
.chat-whatsapp { background: #25D366; }
.chat-messenger { background: #0084FF; }
.chat-telegram { background: #229ED9; }

/* Botón volver arriba */
.btn-arriba {
    position: fixed;
    bottom: 24px;
    left: 24px;
    z-index: 1040;
    width: 46px; height: 46px;
    border-radius: 50%;
    background: var(--superficie);
    border: 1px solid var(--borde);
    color: var(--texto);
    display: none;
    align-items: center;
    justify-content: center;
    box-shadow: var(--sombra-suave);
    transition: var(--transicion);
}
.btn-arriba:hover { border-color: var(--color-azul); color: var(--color-azul); }

/* ---------------------------------------------------------------------
   FORMULARIOS
   --------------------------------------------------------------------- */
.form-control, .form-select {
    background: var(--superficie);
    border: 1.5px solid var(--borde);
    color: var(--texto);
    padding: 0.75rem 1rem;
    border-radius: var(--radio-sm);
}
.form-control:focus, .form-select:focus {
    background: var(--superficie);
    color: var(--texto);
    border-color: var(--color-azul);
    box-shadow: 0 0 0 4px var(--color-azul-glow);
}
.form-label { font-weight: 600; font-size: 0.9rem; }
::placeholder { color: var(--texto-secundario); opacity: 0.7; }

/* ---------------------------------------------------------------------
   UTILIDADES SCROLL REVEAL
   --------------------------------------------------------------------- */
[data-aos] { }

/* Loader inicial */
#loader-bfa {
    position: fixed; inset: 0; background: var(--bg);
    z-index: 9999;
    display: flex; align-items: center; justify-content: center;
    transition: opacity 0.4s ease, visibility 0.4s ease;
}
#loader-bfa .spinner-bfa {
    width: 42px; height: 42px;
    border: 3px solid var(--borde);
    border-top-color: var(--color-azul);
    border-radius: 50%;
    animation: girar 0.8s linear infinite;
}
@keyframes girar { to { transform: rotate(360deg); } }
#loader-bfa.oculto { opacity: 0; visibility: hidden; }

/* Responsive */
@media (max-width: 991.98px) {
    .hero-stack { height: 340px; margin-top: 2rem; }
    .hero-stack .tarjeta-sistema { width: 240px; }
}