/* ------------- Header / Nav ------------- */

.site-header {
    position: sticky; top: 0; z-index: 30;
    backdrop-filter: blur(14px) saturate(140%);
    -webkit-backdrop-filter: blur(14px) saturate(140%);
    background: color-mix(in oklab, var(--bg-0) 65%, transparent);
    border-bottom: 1px solid var(--border);
}
.site-header__inner {
    display: flex; align-items: center; gap: 1.5rem;
    padding-block: 0.85rem;
}
.brand { display: inline-flex; align-items: center; gap: 0.75rem; color: var(--text); text-decoration: none; }
.brand__logo {
    width: 44px; height: 44px; object-fit: contain; border-radius: 0;
    filter: drop-shadow(0 4px 12px rgba(0, 0, 0, 0.35));
}
.brand__text { display: grid; line-height: 1; }
.brand__name { font-weight: 700; letter-spacing: -0.01em; }
.brand__tag { font-size: 0.72rem; color: var(--text-dim); margin-top: 4px; letter-spacing: 0.04em; text-transform: uppercase; }
.brand--footer { align-items: flex-start; gap: 0.9rem; }
.brand--footer .brand__logo { width: 56px; height: 56px; }

.site-nav { display: flex; align-items: center; gap: 0.25rem; margin-left: auto; }
.site-nav__link {
    padding: 0.55rem 0.9rem; border-radius: 999px; color: var(--text-soft);
    font-weight: 500; font-size: 0.95rem;
}
.site-nav__link:hover { color: var(--text); background: var(--surface); }
.site-nav__link.is-active { color: #04202a; background: var(--brand-1); }

.nav-toggle {
    display: none; margin-left: auto; background: transparent; border: 1px solid var(--border);
    border-radius: 10px; padding: 0.4rem 0.55rem; cursor: pointer;
}
.nav-toggle span { display: block; width: 22px; height: 2px; background: var(--text); margin: 4px 0; border-radius: 2px; }

@media (max-width: 720px) {
    .nav-toggle { display: inline-block; }
    .site-nav {
        position: absolute; top: 100%; left: 0; right: 0; background: var(--bg-1);
        border-top: 1px solid var(--border); flex-direction: column; padding: 0.5rem 1rem;
        display: none;
    }
    .site-nav.is-open { display: flex; }
    .site-nav__link { width: 100%; }
}

/* ------------- Buttons ------------- */

.btn {
    display: inline-flex; align-items: center; justify-content: center; gap: 0.5rem;
    padding: 0.7rem 1.15rem; border-radius: 12px; font-weight: 600; font-size: 0.95rem;
    border: 1px solid transparent; cursor: pointer; text-decoration: none; transition: transform 0.08s ease, background 0.15s ease, box-shadow 0.15s ease;
}
.btn:active { transform: translateY(1px); }
.btn--primary { background: var(--brand-1); color: #04202a; box-shadow: var(--shadow-1); }
.btn--primary:hover { background: #67e8f9; color: #04202a; }
.btn--ghost { background: transparent; color: var(--text); border-color: var(--border-strong); }
.btn--ghost:hover { background: var(--surface-strong); color: var(--text); }
.btn--lg { padding: 0.9rem 1.4rem; font-size: 1rem; border-radius: 14px; }

/* ------------- Chips / Level ------------- */

.chip {
    display: inline-flex; align-items: center; gap: 0.4rem; padding: 0.28rem 0.6rem;
    border-radius: 999px; background: var(--surface); border: 1px solid var(--border);
    color: var(--text-soft); font-size: 0.78rem; font-weight: 500;
}
.chip--soft { background: rgba(34, 211, 238, 0.12); color: #a5f3fc; border-color: transparent; }
.chip--strong { background: var(--brand-1); color: #04202a; border-color: transparent; }

.level {
    display: inline-flex; align-items: center; padding: 0.28rem 0.7rem; border-radius: 999px;
    font-size: 0.75rem; font-weight: 700; letter-spacing: 0.04em; text-transform: uppercase;
}
.level--principiante { background: rgba(52, 211, 153, 0.18); color: #86efac; }
.level--intermedio { background: rgba(251, 191, 36, 0.16); color: #fde68a; }
.level--avanzado { background: rgba(248, 113, 113, 0.16); color: #fecaca; }

/* ------------- Cards ------------- */

.card {
    background: var(--surface); border: 1px solid var(--border); border-radius: var(--radius);
    padding: 1.25rem;
}
.card--soft { background: linear-gradient(180deg, var(--surface-strong), var(--surface)); }
.card--glass {
    background: linear-gradient(180deg, rgba(255, 255, 255, 0.06), rgba(255, 255, 255, 0.02));
    backdrop-filter: blur(12px) saturate(140%);
    -webkit-backdrop-filter: blur(12px) saturate(140%);
    box-shadow: var(--shadow-glow), var(--shadow-2);
    border-color: var(--border-strong);
}

/* Avatar */
.avatar {
    width: 36px; height: 36px; border-radius: 50%; background: var(--brand-grad);
    color: #04202a; font-weight: 800; display: inline-grid; place-items: center; text-transform: uppercase;
    font-size: 0.9rem; flex-shrink: 0;
}
.avatar--lg { width: 52px; height: 52px; font-size: 1.15rem; }

/* Dots */
.dot { width: 10px; height: 10px; border-radius: 50%; display: inline-block; }
.dot--red { background: #f87171; }
.dot--yellow { background: #fbbf24; }
.dot--green { background: #34d399; }

/* Video frame */
.video-frame {
    position: relative; aspect-ratio: 16 / 9; border-radius: var(--radius); overflow: hidden;
    background: #000; border: 1px solid var(--border-strong); box-shadow: var(--shadow-2);
}
.video-frame iframe { position: absolute; inset: 0; width: 100%; height: 100%; border: 0; }
.video-frame--lg { border-radius: var(--radius-lg); }

/* Grids */
.grid { display: grid; gap: var(--gap); }
.grid--cards { grid-template-columns: repeat(auto-fit, minmax(280px, 1fr)); }

.section { padding: clamp(2rem, 3vw + 1rem, 4.5rem) 0; }
.section--alt {
    background: linear-gradient(180deg, transparent, rgba(167, 139, 250, 0.06), transparent);
}
.section__head {
    display: flex; align-items: flex-end; justify-content: space-between; gap: 1rem;
    margin-bottom: 1.5rem; flex-wrap: wrap;
}
.section__title { margin: 0; }

.link-arrow { color: var(--text); font-weight: 600; }
.link-arrow:hover { color: var(--brand-1); }
.link-arrow--back { display: inline-flex; align-items: center; margin-bottom: 0.75rem; color: var(--text-soft); }

/* ------------- Post card ------------- */

.post-card {
    display: flex; flex-direction: column; background: var(--surface); border: 1px solid var(--border);
    border-radius: var(--radius); overflow: hidden; transition: transform 0.15s ease, border-color 0.15s ease, box-shadow 0.2s ease;
}
.post-card:hover { transform: translateY(-3px); border-color: var(--border-strong); box-shadow: var(--shadow-2); }
.post-card__media { display: block; aspect-ratio: 16 / 9; background: linear-gradient(135deg, #1c2b48, #0f172a); overflow: hidden; }
.post-card__media img { width: 100%; height: 100%; object-fit: cover; border-radius: 0; }
.post-card__body { display: flex; flex-direction: column; gap: 0.6rem; padding: 1.1rem 1.15rem 1.15rem; flex: 1; }
.post-card__meta { display: flex; flex-wrap: wrap; gap: 0.4rem; color: var(--text-dim); font-size: 0.82rem; }
.post-card__title { font-size: 1.2rem; margin: 0; }
.post-card__title a { color: var(--text); }
.post-card__title a:hover { color: var(--brand-1); }
.post-card__excerpt { color: var(--text-soft); font-size: 0.95rem; margin: 0; }
.post-card__foot { display: flex; align-items: center; justify-content: space-between; gap: 1rem; margin-top: auto; padding-top: 0.75rem; border-top: 1px solid var(--border); }
.post-card__author { display: inline-flex; align-items: center; gap: 0.6rem; font-size: 0.85rem; color: var(--text-soft); }
.post-card__author small { color: var(--text-dim); }

/* ------------- Course card ------------- */

.course-card {
    display: flex; flex-direction: column; background: var(--surface); border: 1px solid var(--border);
    border-radius: var(--radius); overflow: hidden; transition: transform 0.15s ease, border-color 0.15s ease, box-shadow 0.2s ease;
}
.course-card:hover { transform: translateY(-3px); border-color: var(--border-strong); box-shadow: var(--shadow-2); }
.course-card__media { position: relative; aspect-ratio: 16 / 9; overflow: hidden; background: linear-gradient(135deg, #142036, #0f172a); }
.course-card__media img { width: 100%; height: 100%; object-fit: cover; border-radius: 0; }
.course-card__level { position: absolute; top: 0.75rem; left: 0.75rem; }
.course-card__body { display: flex; flex-direction: column; gap: 0.55rem; padding: 1.1rem 1.15rem 1.15rem; flex: 1; }
.course-card__meta { display: flex; flex-wrap: wrap; gap: 0.4rem; }
.course-card__title { font-size: 1.2rem; margin: 0; }
.course-card__title a { color: var(--text); }
.course-card__title a:hover { color: var(--brand-1); }
.course-card__subtitle { color: var(--text-soft); font-size: 0.95rem; margin: 0; }
.course-card__summary { color: var(--text-dim); font-size: 0.9rem; margin: 0; }
.course-card__foot { display: flex; align-items: center; justify-content: space-between; gap: 1rem; margin-top: auto; padding-top: 0.75rem; border-top: 1px solid var(--border); }
.course-card__author { display: inline-flex; align-items: center; gap: 0.6rem; font-size: 0.85rem; color: var(--text-soft); }
.course-card__author small { color: var(--text-dim); }

/* ------------- Modal (blog post preview) ------------- */

.post-modal { position: fixed; inset: 0; z-index: 50; display: none; }
.post-modal.is-open { display: block; }
.post-modal__backdrop {
    position: absolute; inset: 0; background: rgba(4, 8, 20, 0.72);
    backdrop-filter: blur(6px); -webkit-backdrop-filter: blur(6px);
    animation: fade-in 0.18s ease;
}
.post-modal__panel {
    position: relative; margin: 5vh auto; width: min(880px, calc(100% - 2rem));
    max-height: 90vh; overflow: auto; background: var(--bg-2); border: 1px solid var(--border-strong);
    border-radius: var(--radius-lg); box-shadow: var(--shadow-2);
    animation: pop-in 0.22s cubic-bezier(0.2, 0.9, 0.3, 1);
}
.post-modal__head { display: flex; align-items: center; justify-content: space-between; gap: 1rem; padding: 1rem 1.25rem; border-bottom: 1px solid var(--border); position: sticky; top: 0; background: color-mix(in oklab, var(--bg-2) 90%, transparent); backdrop-filter: blur(8px); }
.post-modal__meta { color: var(--text-dim); font-size: 0.85rem; display: flex; gap: 0.6rem; flex-wrap: wrap; align-items: center; }
.post-modal__tags { display: inline-flex; gap: 0.4rem; flex-wrap: wrap; }
.post-modal__close { background: transparent; border: 1px solid var(--border-strong); color: var(--text); border-radius: 10px; padding: 0.35rem; cursor: pointer; }
.post-modal__close:hover { background: var(--surface-strong); }
.post-modal__gallery { display: grid; grid-template-columns: repeat(auto-fit, minmax(240px, 1fr)); gap: 0.5rem; padding: 1rem 1.25rem 0; }
.post-modal__gallery figure { margin: 0; }
.post-modal__gallery img { width: 100%; aspect-ratio: 16 / 9; object-fit: cover; }
.post-modal__gallery figcaption { font-size: 0.78rem; color: var(--text-dim); padding: 0.35rem 0.15rem 0; }
.post-modal__body { padding: 1.25rem; }
.post-modal__title { font-size: var(--step-4); margin-bottom: 0.75rem; }
.post-modal__author { display: inline-flex; align-items: center; gap: 0.75rem; margin-bottom: 1rem; color: var(--text-soft); }
.post-modal__author small { display: block; color: var(--text-dim); }
.post-modal__content p { color: var(--text-soft); }
.post-modal__foot { display: flex; gap: 0.75rem; flex-wrap: wrap; padding-top: 1rem; border-top: 1px solid var(--border); margin-top: 1rem; }

@keyframes fade-in { from { opacity: 0; } to { opacity: 1; } }
@keyframes pop-in { from { opacity: 0; transform: translateY(12px) scale(0.98); } to { opacity: 1; transform: none; } }

/* ------------- Footer ------------- */

.site-footer { border-top: 1px solid var(--border); margin-top: 4rem; background: linear-gradient(180deg, transparent, rgba(0, 0, 0, 0.3)); }
.site-footer__grid { display: grid; grid-template-columns: 2fr 1fr 1fr 1.5fr; gap: 2rem; padding: 3rem 0 2rem; }
.site-footer__col h3 { font-size: 0.95rem; color: var(--text); margin-bottom: 0.75rem; letter-spacing: 0.04em; text-transform: uppercase; }
.site-footer__col ul { list-style: none; padding: 0; margin: 0; display: grid; gap: 0.4rem; }
.site-footer__col a { color: var(--text-soft); }
.site-footer__col a:hover { color: var(--brand-1); }
.site-footer__mission { color: var(--text-dim); font-size: 0.9rem; margin-top: 0.75rem; }
.site-footer__title--social { margin-top: 1.5rem !important; }
.site-footer__social { display: flex !important; flex-wrap: wrap; gap: 0.5rem !important; }
.site-footer__social li { list-style: none; }
.site-footer__social a {
    display: inline-flex; align-items: center; gap: 0.35rem;
    padding: 0.35rem 0.75rem; border-radius: 999px;
    background: rgba(148, 163, 184, 0.08); border: 1px solid var(--border);
    font-size: 0.85rem; color: var(--text-soft); transition: all 0.15s ease;
}
.site-footer__social a:hover { background: var(--brand-grad); color: #0a0f1e; border-color: transparent; }

.sponsor-card {
    display: inline-flex; align-items: center; gap: 0.55rem; padding: 0.55rem 0.85rem;
    border-radius: 999px; background: linear-gradient(135deg, rgba(34, 211, 238, 0.16), rgba(251, 191, 36, 0.16));
    border: 1px solid var(--border-strong); color: var(--text); font-weight: 700;
}
.sponsor-card__badge { font-size: 0.7rem; color: var(--text-dim); text-transform: uppercase; letter-spacing: 0.1em; }
.sponsor-card__disclaimer { margin-top: 0.7rem; font-size: 0.82rem; color: var(--text-dim); }

.site-footer__bottom {
    display: flex; align-items: center; justify-content: space-between; gap: 1rem;
    padding: 1rem 0; border-top: 1px solid var(--border); color: var(--text-dim); font-size: 0.82rem;
    flex-wrap: wrap;
}

@media (max-width: 800px) {
    .site-footer__grid { grid-template-columns: 1fr 1fr; }
    .site-footer__col--brand, .site-footer__col--sponsor { grid-column: 1 / -1; }
}