/* ============================================================
   LitroVolt · Sistema de diseño web
   Refleja el lenguaje visual de la app Flutter (Material 3, Inter)
   ============================================================ */

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

:root {
    /* Marca */
    --azul-50: #EAF2FD;
    --azul-100: #CCDEF8;
    --azul-200: #9CBEF1;
    --azul-400: #4B8EE0;
    --azul-500: #1B6FD4;
    --azul-600: #0F5BB8;
    --azul-700: #0D4FA0;
    --azul-900: #082A5C;

    --verde-400: #43C474;
    --verde-500: #27AE60;
    --verde-600: #1F8F4E;
    --verde-100: #D8F1E3;

    --amarillo-500: #F1C40F;
    --amarillo-100: #FDF3CC;

    --rojo-500: #E74C3C;
    --rojo-100: #FBD9D5;

    /* Neutros claros */
    --fondo: #F8FAFE;
    --fondo-mas: #F1F5FB;
    --superficie: #FFFFFF;
    --texto: #0B1220;
    --texto-2: #3B4659;
    --texto-3: #6B7686;
    --borde: #E3E9F2;
    --borde-fuerte: #CFD8E5;

    /* Efectos */
    --sombra-xs: 0 1px 2px rgba(11, 18, 32, 0.04);
    --sombra-sm: 0 2px 8px rgba(11, 18, 32, 0.05), 0 1px 3px rgba(11, 18, 32, 0.04);
    --sombra-md: 0 8px 24px rgba(11, 18, 32, 0.06), 0 2px 6px rgba(11, 18, 32, 0.04);
    --sombra-lg: 0 24px 56px rgba(27, 111, 212, 0.10), 0 8px 16px rgba(11, 18, 32, 0.06);
    --sombra-azul: 0 18px 40px rgba(27, 111, 212, 0.28);

    --r-sm: 10px;
    --r-md: 16px;
    --r-lg: 22px;
    --r-xl: 28px;
    --r-full: 999px;

    --transicion: 220ms cubic-bezier(0.2, 0.8, 0.2, 1);
    --fuente: 'Inter', -apple-system, BlinkMacSystemFont, system-ui, 'Segoe UI', sans-serif;
}

@media (prefers-color-scheme: dark) {
    :root {
        --fondo: #0A0F1C;
        --fondo-mas: #0E1526;
        --superficie: #111A2E;
        --superficie-2: #16213A;
        --texto: #EDF2FA;
        --texto-2: #B4C2D8;
        --texto-3: #7C8AA3;
        --borde: #1E2B47;
        --borde-fuerte: #2A3B5E;

        --sombra-sm: 0 2px 10px rgba(0, 0, 0, 0.35);
        --sombra-md: 0 10px 28px rgba(0, 0, 0, 0.45);
        --sombra-lg: 0 24px 56px rgba(0, 0, 0, 0.55);
    }
}

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

body {
    font-family: var(--fuente);
    font-feature-settings: 'cv11', 'ss01', 'ss03';
    background: var(--fondo);
    color: var(--texto);
    line-height: 1.6;
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
    overflow-x: hidden;
}

a { color: inherit; text-decoration: none; }
button { font-family: inherit; cursor: pointer; border: none; background: none; }
img, svg { display: block; max-width: 100%; }

/* ============================================================
   LAYOUT
   ============================================================ */
.contenedor {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 28px;
}

.contenedor-angosto {
    max-width: 820px;
    margin: 0 auto;
    padding: 0 28px;
}

/* ============================================================
   CABECERA / NAV
   ============================================================ */
.nav {
    position: sticky;
    top: 0;
    z-index: 100;
    background: var(--fondo);
    border-bottom: 1px solid var(--borde);
}

.nav-inner {
    max-width: 1200px;
    margin: 0 auto;
    padding: 16px 28px;
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 24px;
}

.marca {
    display: flex;
    align-items: center;
    gap: 10px;
    font-weight: 800;
    font-size: 18px;
    letter-spacing: -0.2px;
    color: var(--texto);
}

.marca-logo {
    width: 40px;
    height: 40px;
    border-radius: 22px;
    overflow: hidden;
    flex-shrink: 0;
    box-shadow: 0 6px 16px rgba(27, 111, 212, 0.22), 0 2px 4px rgba(11, 18, 32, 0.08);
    background: var(--superficie);
}

.marca-logo img {
    width: 100%;
    height: 100%;
    display: block;
    object-fit: cover;
}

.nav-links {
    display: flex;
    gap: 32px;
    list-style: none;
    font-size: 14.5px;
    font-weight: 500;
}

.nav-links a {
    color: var(--texto-2);
    transition: color var(--transicion);
}

.nav-links a:hover { color: var(--azul-500); }

.nav-cta {
    display: inline-flex;
    align-items: center;
    gap: 8px;
    padding: 10px 18px;
    background: var(--texto);
    color: var(--superficie);
    border-radius: var(--r-full);
    font-weight: 600;
    font-size: 14px;
    transition: transform var(--transicion), box-shadow var(--transicion);
}

.nav-cta:hover {
    transform: translateY(-1px);
    box-shadow: var(--sombra-md);
}

/* ============================================================
   BOTONES
   ============================================================ */
.boton {
    display: inline-flex;
    align-items: center;
    gap: 10px;
    padding: 14px 24px;
    border-radius: var(--r-full);
    font-weight: 600;
    font-size: 15px;
    transition: transform var(--transicion), box-shadow var(--transicion), background var(--transicion);
    white-space: nowrap;
}

.boton svg { width: 18px; height: 18px; }

.boton-primario {
    background: var(--azul-500);
    color: white;
    box-shadow: var(--sombra-azul);
}

.boton-primario:hover {
    background: var(--azul-600);
    transform: translateY(-2px);
    box-shadow: 0 22px 48px rgba(27, 111, 212, 0.38);
}

.boton-fantasma {
    background: transparent;
    color: var(--texto);
    border: 1.5px solid var(--borde-fuerte);
}

.boton-fantasma:hover {
    background: var(--superficie);
    border-color: var(--azul-400);
    color: var(--azul-600);
}

/* ============================================================
   TIPOGRAFÍA
   ============================================================ */
.ojillo {
    display: inline-flex;
    align-items: center;
    gap: 8px;
    padding: 6px 14px;
    background: var(--azul-50);
    color: var(--azul-600);
    border-radius: var(--r-full);
    font-size: 12.5px;
    font-weight: 600;
    letter-spacing: 0.2px;
}

@media (prefers-color-scheme: dark) {
    .ojillo {
        background: rgba(27, 111, 212, 0.15);
        color: var(--azul-200);
    }
}

.ojillo-verde {
    background: var(--verde-100);
    color: var(--verde-600);
}

@media (prefers-color-scheme: dark) {
    .ojillo-verde {
        background: rgba(39, 174, 96, 0.15);
        color: var(--verde-400);
    }
}

.titulo-1 {
    font-size: clamp(40px, 6vw, 68px);
    font-weight: 800;
    line-height: 1.02;
    letter-spacing: -1.5px;
    color: var(--texto);
}

.titulo-1 em {
    font-style: normal;
    background: linear-gradient(120deg, var(--azul-500), var(--verde-500));
    -webkit-background-clip: text;
    background-clip: text;
    color: transparent;
}

.titulo-2 {
    font-size: clamp(28px, 4vw, 44px);
    font-weight: 800;
    line-height: 1.1;
    letter-spacing: -0.8px;
    color: var(--texto);
}

.titulo-3 {
    font-size: 20px;
    font-weight: 700;
    line-height: 1.3;
    letter-spacing: -0.2px;
    color: var(--texto);
}

.parrafo-grande {
    font-size: 18px;
    line-height: 1.65;
    color: var(--texto-2);
    max-width: 58ch;
}

.parrafo {
    font-size: 15.5px;
    line-height: 1.7;
    color: var(--texto-2);
}

/* ============================================================
   SECCIONES
   ============================================================ */
section {
    padding: 110px 0;
    position: relative;
}

.cabecera-seccion {
    text-align: center;
    max-width: 680px;
    margin: 0 auto 64px;
}

.cabecera-seccion .ojillo {
    margin-bottom: 18px;
}

.cabecera-seccion .titulo-2 {
    margin-bottom: 18px;
}

.cabecera-seccion .parrafo-grande {
    margin: 0 auto;
}

/* ============================================================
   PIE
   ============================================================ */
footer {
    background: var(--superficie);
    border-top: 1px solid var(--borde);
    padding: 70px 0 40px;
    margin-top: 40px;
}

.pie-rejilla {
    display: grid;
    grid-template-columns: 1.4fr 1fr 1fr 1fr;
    gap: 48px;
    margin-bottom: 56px;
}

.pie-marca {
    max-width: 320px;
}

.pie-marca p {
    color: var(--texto-3);
    font-size: 14.5px;
    line-height: 1.65;
    margin-top: 16px;
}

.pie-columna h4 {
    color: var(--texto);
    font-size: 13px;
    font-weight: 700;
    text-transform: uppercase;
    letter-spacing: 0.6px;
    margin-bottom: 18px;
}

.pie-columna ul {
    list-style: none;
    display: flex;
    flex-direction: column;
    gap: 12px;
}

.pie-columna a {
    color: var(--texto-3);
    font-size: 14.5px;
    transition: color var(--transicion);
}

.pie-columna a:hover { color: var(--azul-500); }

.pie-legal {
    padding-top: 32px;
    border-top: 1px solid var(--borde);
    display: flex;
    justify-content: space-between;
    align-items: center;
    flex-wrap: wrap;
    gap: 16px;
    font-size: 13.5px;
    color: var(--texto-3);
}

/* ============================================================
   RESPONSIVE
   ============================================================ */
@media (max-width: 880px) {
    .nav-links { display: none; }
    section { padding: 72px 0; }
    .pie-rejilla { grid-template-columns: 1fr 1fr; gap: 32px; }
    .pie-marca { grid-column: 1 / -1; }
}

@media (max-width: 520px) {
    .contenedor { padding: 0 20px; }
    .nav-inner { padding: 14px 20px; }
    .pie-rejilla { grid-template-columns: 1fr; }
}

/* ============================================================
   SHOWCASE — Bloques de funcionalidades con capturas
   ============================================================ */
.showcase { display: flex; flex-direction: column; gap: 80px; margin-top: 56px; }

.showcase-bloque {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 56px;
    align-items: center;
}

.showcase-bloque.showcase-invertido { direction: rtl; }
.showcase-bloque.showcase-invertido > * { direction: ltr; }

.showcase-bloque.showcase-destacado {
    background: linear-gradient(135deg, rgba(27,111,212,0.04), rgba(39,174,96,0.04));
    border: 1px solid rgba(27,111,212,0.1);
    border-radius: 24px;
    padding: 48px;
}

.showcase-etiqueta {
    display: inline-block;
    font-size: 12px;
    font-weight: 700;
    text-transform: uppercase;
    letter-spacing: 1px;
    color: var(--primario);
    background: rgba(27,111,212,0.08);
    padding: 6px 14px;
    border-radius: 20px;
    margin-bottom: 16px;
}

.showcase-texto h3 {
    font-size: 28px;
    font-weight: 900;
    letter-spacing: -0.5px;
    margin-bottom: 16px;
    color: var(--texto);
}

.showcase-texto p {
    font-size: 16px;
    line-height: 1.7;
    color: var(--texto-secundario);
    margin-bottom: 20px;
}

.showcase-lista {
    list-style: none;
    padding: 0;
    display: flex;
    flex-direction: column;
    gap: 10px;
}

.showcase-lista li {
    font-size: 14px;
    font-weight: 500;
    color: var(--texto);
    padding-left: 24px;
    position: relative;
}

.showcase-lista li::before {
    content: '✓';
    position: absolute;
    left: 0;
    color: #27AE60;
    font-weight: 700;
}

.showcase-placeholder {
    aspect-ratio: 9/16;
    max-height: 480px;
    background: linear-gradient(135deg, rgba(27,111,212,0.06), rgba(27,111,212,0.02));
    border: 2px dashed rgba(27,111,212,0.15);
    border-radius: 20px;
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    gap: 12px;
    color: var(--texto-secundario);
    font-size: 13px;
    font-weight: 500;
}

.showcase-placeholder svg { opacity: 0.3; }

/* Cuando se reemplace el placeholder por una imagen real */
.showcase-imagen img {
    width: 100%;
    max-height: 480px;
    object-fit: contain;
    border-radius: 20px;
    box-shadow: 0 20px 60px rgba(0,0,0,0.12), 0 4px 16px rgba(0,0,0,0.06);
}

/* Bloque de extras (grid 3x2) */
.showcase-bloque-extra {
    text-align: center;
    padding: 48px 0;
}

.showcase-bloque-extra h3 {
    font-size: 24px;
    font-weight: 800;
    margin-bottom: 36px;
    color: var(--texto);
}

.showcase-extras-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 24px;
}

.showcase-extra-item {
    background: var(--superficie);
    border: 1px solid var(--borde);
    border-radius: 16px;
    padding: 28px 20px;
    text-align: center;
    transition: transform 0.2s, box-shadow 0.2s;
}

.showcase-extra-item:hover {
    transform: translateY(-4px);
    box-shadow: 0 12px 32px rgba(0,0,0,0.08);
}

.showcase-extra-icono {
    width: 48px;
    height: 48px;
    border-radius: 14px;
    display: inline-flex;
    align-items: center;
    justify-content: center;
    font-size: 22px;
    margin-bottom: 14px;
}

.showcase-extra-item h4 {
    font-size: 15px;
    font-weight: 700;
    margin-bottom: 6px;
    color: var(--texto);
}

.showcase-extra-item p {
    font-size: 13px;
    line-height: 1.5;
    color: var(--texto-secundario);
}

/* Responsive showcase */
@media (max-width: 900px) {
    .showcase-bloque {
        grid-template-columns: 1fr;
        gap: 32px;
    }
    .showcase-bloque.showcase-invertido { direction: ltr; }
    .showcase-bloque.showcase-destacado { padding: 32px 24px; }
    .showcase-extras-grid { grid-template-columns: repeat(2, 1fr); }
    .showcase-placeholder { max-height: 360px; }
}

@media (max-width: 520px) {
    .showcase-extras-grid { grid-template-columns: 1fr; }
    .showcase-texto h3 { font-size: 22px; }
}