/* ===================================================
   FORUM XXI – STYLE.CSS
   Diseño institucional / moderno
   Responsive (Desktop + Mobile)
=================================================== */

/* ================= VARIABLES ================= */
:root {
    --azul: #062F4F;
    --azul-claro: #0B4A6F;
    --amarillo: #FFD83D;
    --blanco: #FFFFFF;
    --negro: #111111;
    --gris: #666666;
    --gris-claro: #F4F4F4;
}

/* ================= RESET ================= */
* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

html {
    scroll-behavior: smooth;
}

body {
    font-family: Arial, Helvetica, sans-serif;
    background: var(--blanco);
    color: var(--negro);
    line-height: 1.6;
}

/* ================= HEADER ================= */
header {
    background: linear-gradient(90deg, var(--azul), var(--azul-claro));
    padding: 15px 40px;
}

.header-top {
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.logo img {
    height: 60px;
    width: auto;
}

/* MENU */
nav {
    margin-top: 15px;
}

nav ul {
    list-style: none;
    display: flex;
    gap: 30px;
    justify-content: center;
}

nav a {
    color: var(--blanco);
    text-decoration: none;
    font-weight: 600;
    letter-spacing: 1px;
    font-size: 15px;
}

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

/* MENU MOVIL */
.menu-toggle {
    display: none;
    font-size: 32px;
    color: var(--blanco);
    cursor: pointer;
}

/* ================= ROLLOVER ================= */
.rollover {
    position: relative;
}

.rollover img {
    width: 100%;
    display: block;
}

.rollover-text {
    position: absolute;
    bottom: 30px;
    right: 30px;
    background: rgba(6,47,79,0.85);
    color: var(--blanco);
    padding: 18px 22px;
    font-size: 18px;
    max-width: 55%;
    border-left: 5px solid var(--amarillo);
}

/* ================= POSTS ================= */
.posts {
    max-width: 1200px;
    margin: 70px auto;
    padding: 0 25px;
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
    gap: 35px;
}

.post {
    background: var(--blanco);
    border: 1px solid #ddd;
    transition: all 0.3s ease;
}

.post:hover {
    transform: translateY(-6px);
    box-shadow: 0 10px 25px rgba(0,0,0,0.12);
}

.post img {
    width: 100%;
    height: 190px;
    object-fit: cover;
}

.post h3 {
    padding: 22px;
    font-size: 20px;
    color: var(--negro);
}

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

/* POST SIN IMAGEN */
.post h3:only-child {
    text-align: center;
}

/* ================= FOOTER ================= */
footer {
    background: var(--azul);
    color: var(--blanco);
    padding: 45px 20px;
    text-align: center;
    font-size: 15px;
}

footer p {
    margin-bottom: 10px;
}

footer a {
    color: var(--amarillo);
    text-decoration: none;
}

footer a:hover {
    text-decoration: underline;
}

/* ================= RESPONSIVE ================= */
@media (max-width: 768px) {

    header {
        padding: 15px 20px;
    }

    .logo img {
        height: 48px;
    }

    .menu-toggle {
        display: block;
    }

    nav {
        display: none;
        width: 100%;
    }

    nav.active {
        display: block;
        margin-top: 20px;
    }

    nav ul {
        flex-direction: column;
        gap: 18px;
    }

    nav a {
        font-size: 18px;
        padding: 12px 0;
        display: block;
    }

    .rollover-text {
        position: static;
        margin: 15px;
        max-width: 100%;
        font-size: 16px;
    }

    .posts {
        grid-template-columns: 1fr;
        margin: 50px auto;
    }

    .post img {
        height: 210px;
    }

    footer {
        font-size: 14px;
    }
}