:root {
    --amarillo: #f6c400;
    --negro: #111111;
    --gris: #626262;
    --fondo: #f1eee5;
    --blanco: #ffffff;
    --max: 1180px;
    --sombra: 0 15px 40px rgba(0, 0, 0, .16);
}

* {
    box-sizing: border-box;
}

html {
    scroll-behavior: smooth;
}

body {
    margin: 0;
    font-family: Georgia, "Times New Roman", serif;
    color: var(--negro);
    background: var(--fondo);
    line-height: 1.65;
}

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

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

.contenedor {
    width: min(92%, var(--max));
    margin: auto;
}

/* =========================
       NAVEGACIÓN
       ========================= */

.barra {
    position: sticky;
    top: 0;
    z-index: 100;
    background: var(--negro);
    color: white;
    border-bottom: 4px solid var(--amarillo);
}

.nav {
    min-height: 68px;
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 25px;
}

.marca {
    font-family: Arial, Helvetica, sans-serif;
    font-weight: 900;
    text-transform: uppercase;
    letter-spacing: .05em;
}

.marca span {
    color: var(--amarillo);
}

.menu {
    display: flex;
    gap: 22px;
    font-family: Arial, Helvetica, sans-serif;
    text-transform: uppercase;
    font-size: .86rem;
}

.menu a:hover {
    color: var(--amarillo);
}

/* =========================
       INICIO
       ========================= */

.hero {
    background:
        radial-gradient(circle at 75% 25%, rgba(246, 196, 0, .13), transparent 27%),
        linear-gradient(120deg, #090909, #1d1b16);
    color: white;
    padding: 75px 0;
}

.hero-grid {
    display: grid;
    grid-template-columns: 1.08fr .92fr;
    gap: 65px;
    align-items: center;
}

.hero-imagen img {
    width: 100%;
    height: auto;
    box-shadow: 0 22px 55px rgba(0, 0, 0, .48);
}

.hero h1 {
    margin: 0 0 26px;
    font-family: Arial, Helvetica, sans-serif;
    font-size: clamp(3rem, 7vw, 6rem);
    line-height: .9;
    text-transform: uppercase;
    letter-spacing: -.045em;
}

.hero h1 span {
    display: block;
    color: var(--amarillo);
}

.hero-texto {
    margin: 0;
    max-width: 640px;
    font-size: 1.42rem;
}

/* =========================
       EL LIBRO
       ========================= */

section {
    padding: 90px 0;
}

.sobrelinea {
    margin: 0 0 8px;
    color: #8a6a00;
    font-family: Arial, Helvetica, sans-serif;
    font-weight: 900;
    letter-spacing: .12em;
    text-transform: uppercase;
}

h2 {
    margin: 0 0 38px;
    font-size: clamp(2.2rem, 4vw, 4rem);
    line-height: 1.06;
    letter-spacing: -.03em;
}

.intro {
    background: white;
}

.intro-grid {
    display: grid;
    grid-template-columns: 1.25fr .75fr;
    gap: 60px;
    align-items: start;
}

.intro p {
    margin-top: 0;
    font-size: 1.12rem;
}

.intro-destacado {
    background: var(--negro);
    color: white;
    padding: 34px;
    border-left: 8px solid var(--amarillo);
    font-size: 1.3rem;
    box-shadow: var(--sombra);
}

/* =========================
       TEMAS
       3 cuadros arriba / 3 abajo
       ========================= */

.temas {
    background: #efede5;
}

.temas .sobrelinea,
.temas h2 {
    text-align: center;
}

.temas-grid {
    display: grid;
    grid-template-columns: repeat(3, minmax(0, 1fr));
    gap: 24px;
    align-items: stretch;
}

.tarjeta {
    background: white;
    padding: 22px;
    border-top: 6px solid var(--amarillo);
    box-shadow: 0 8px 25px rgba(0, 0, 0, .08);
    display: flex;
    flex-direction: column;
}

.tarjeta img {
    width: 100%;
    height: auto;
    object-fit: contain;
    border-bottom: 4px solid var(--amarillo);
    margin-bottom: 18px;
    background: #f3f0e8;
}

.tarjeta h3 {
    margin: 0 0 9px;
    font-size: 1.42rem;
}

.tarjeta p {
    margin: 0;
    color: #555;
}

.francis {
    background: var(--negro);
    color: white;
    border-top-width: 8px;
}

.francis h3 {
    color: var(--amarillo);
}

.francis p {
    color: #e4e4e4;
}

.imagen-sepia {
    filter: grayscale(100%) sepia(25%);
}

.imagen-sugerida {
    min-height: 190px;
    display: flex;
    align-items: center;
    justify-content: center;
    padding: 28px;
    background:
        linear-gradient(135deg, rgba(246, 196, 0, .16), transparent),
        #e9e4d7;
    border-bottom: 4px solid var(--amarillo);
    margin-bottom: 18px;
    text-align: center;
    font-family: Arial, Helvetica, sans-serif;
    font-weight: 700;
    color: #706852;
}

/* =========================
       AUTOR
       ========================= */

.autor {
    background: white;
}

.autor-foto {
    max-width: 360px;
    margin: 0 auto 38px;
}

.autor-foto img {
    width: 100%;
    height: auto;
    box-shadow: var(--sombra);
}

.autor-columnas {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 58px;
}

.autor-columnas p {
    margin-top: 0;
    font-size: 1.08rem;
    text-align: justify;
}

/* =========================
       CIERRE
       ========================= */

.cierre {
    background: var(--amarillo);
    text-align: center;
}

.cierre h2 {
    max-width: 900px;
    margin: 0 auto 24px;
}

.cierre p {
    max-width: 780px;
    margin: auto;
    font-size: 1.18rem;
}

footer {
    background: #090909;
    color: #bdbdbd;
    padding: 28px 0;
    font-family: Arial, Helvetica, sans-serif;
    font-size: .86rem;
}

.pie {
    display: flex;
    justify-content: space-between;
    gap: 20px;
}

/* =========================
       RESPONSIVE
       ========================= */

@media(max-width:900px) {

    .hero-grid,
    .intro-grid,
    .autor-columnas {
        grid-template-columns: 1fr;
    }

    .temas-grid {
        grid-template-columns: repeat(2, 1fr);
    }

    .menu {
        display: none;
    }
}

@media(max-width:620px) {
    section {
        padding: 65px 0;
    }

    .temas-grid {
        grid-template-columns: 1fr;
    }

    .hero {
        padding: 55px 0;
    }

    .pie {
        flex-direction: column;
    }

    .autor-columnas p {
        text-align: left;
    }
}

.donde-conseguir {
    background: var(--negro);
    color: var(--blanco);
    text-align: center;
    padding: 58px 0;
    border-top: 5px solid var(--amarillo);
}

.donde-conseguir .nombre-libro {
    margin: 0 0 8px;
    font-family: Arial, Helvetica, sans-serif;
    font-size: 1.15rem;
    font-weight: 900;
    letter-spacing: .08em;
    text-transform: uppercase;
}

.donde-conseguir .llamada {
    margin: 0;
    color: var(--amarillo);
    font-size: clamp(1.7rem, 3vw, 2.7rem);
    font-weight: 700;
    line-height: 1.2;
}

/* Texto solo para buscadores y lectores de pantalla (no ocupa espacio visual) */
.hero h1.sr-only {
    position: absolute;
    width: 1px;
    height: 1px;
    margin: -1px;
    padding: 0;
    overflow: hidden;
    clip: rect(0, 0, 0, 0);
    white-space: nowrap;
    border: 0;
}

.donde-conseguir .envios {
    margin: 18px 0 0;
    font-size: 1.1rem;
}

.donde-conseguir .envios a {
    color: var(--amarillo);
    text-decoration: underline;
}

/* Autor: en escritorio, foto a la izquierda y texto a la derecha */
@media(min-width:901px) {
    .autor-layout {
        display: grid;
        grid-template-columns: 360px 1fr;
        gap: 58px;
        align-items: start;
    }

    .autor-layout .autor-foto {
        margin: 0;
        width: 100%;
    }

    .autor-layout .autor-columnas {
        grid-template-columns: 1fr;
        gap: 0;
    }
}