/* ==========================================================================
   Učitelit.cz — theme.css
   Paleta: petrolejová #16333A / okrová #D9A441 / šalvěj #7A9E7E / papír #F7F5F0
   Typografie: Fraunces (nadpisy) · Inter (text) · IBM Plex Mono (data/popisky)
   ========================================================================== */

:root {
    --color-ink: #16333A;
    --color-ink-light: #24515E;
    --color-accent: #D9A441;
    --color-accent-dark: #B9822A;
    --color-health: #7A9E7E;
    --color-paper: #F7F5F0;
    --color-paper-alt: #EFEBE1;
    --color-text: #2B2B2B;
    --color-text-muted: #5B5B57;
    --color-border: #DDD6C6;

    --font-display: 'Fraunces', Georgia, serif;
    --font-body: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;
    --font-mono: 'IBM Plex Mono', 'SFMono-Regular', Consolas, monospace;

    --wrap-width: 1120px;
    --radius: 10px;
}

/* ---------- Reset & base ---------- */
*, *::before, *::after { box-sizing: border-box; }
html { scroll-behavior: smooth; }
body {
    margin: 0;
    background: var(--color-paper);
    color: var(--color-text);
    font-family: var(--font-body);
    font-size: 17px;
    line-height: 1.65;
    -webkit-font-smoothing: antialiased;
}
img { max-width: 100%; display: block; }
a { color: var(--color-ink); text-decoration: none; }
h1, h2, h3, h4 {
    font-family: var(--font-display);
    color: var(--color-ink);
    line-height: 1.15;
    margin: 0 0 0.5em;
}
.wrap {
    max-width: var(--wrap-width);
    margin: 0 auto;
    padding: 0 24px;
}
.skip-link {
    position: absolute; left: -9999px; top: 0;
    background: var(--color-ink); color: #fff; padding: 12px 20px; z-index: 999;
}
.skip-link:focus { left: 16px; top: 16px; }

/* ---------- Signature: notebook rule ---------- */
.section__title, .page__title {
    position: relative;
    padding-left: 22px;
}
.section__title::before, .page__header .page__title::before {
    content: "";
    position: absolute;
    left: 0; top: 0.15em; bottom: 0.15em;
    width: 4px;
    border-radius: 2px;
    background: repeating-linear-gradient(
        to bottom,
        var(--color-accent) 0, var(--color-accent) 6px,
        transparent 6px, transparent 11px
    );
}

/* ---------- Header / nav ---------- */
.site-header {
    background: var(--color-ink);
    color: #fff;
    position: sticky;
    top: 0;
    z-index: 100;
}
.site-header__inner {
    display: flex;
    align-items: center;
    justify-content: space-between;
    height: 68px;
}
.brand {
    display: flex;
    align-items: baseline;
    gap: 8px;
    color: #fff;
    font-family: var(--font-display);
    font-size: 1.4rem;
    font-weight: 600;
}
.brand__mark { color: var(--color-accent); font-size: 1.2rem; }
.brand__dot { color: var(--color-accent); }
.primary-nav ul {
    list-style: none;
    display: flex;
    gap: 28px;
    margin: 0;
    padding: 0;
}
.primary-nav a {
    color: #EDEAE0;
    font-size: 0.95rem;
    font-weight: 500;
    padding: 6px 2px;
    border-bottom: 2px solid transparent;
    transition: border-color .15s ease, color .15s ease;
}
.primary-nav a:hover, .primary-nav a:focus { color: #fff; border-color: var(--color-accent); }
.nav-toggle {
    display: none;
    background: none; border: 0; width: 40px; height: 40px;
    flex-direction: column; justify-content: center; gap: 5px; cursor: pointer;
}
.nav-toggle span { display: block; height: 2px; background: #fff; }

/* ---------- Hero ---------- */
.hero {
    background: linear-gradient(180deg, var(--color-ink) 0%, var(--color-ink-light) 100%);
    color: #F2EFE6;
    padding: 72px 0 88px;
}
.hero__inner {
    display: grid;
    grid-template-columns: 1.3fr 0.7fr;
    gap: 48px;
    align-items: center;
}
.eyebrow {
    font-family: var(--font-mono);
    text-transform: uppercase;
    letter-spacing: .08em;
    font-size: 0.78rem;
    color: var(--color-accent);
    margin: 0 0 10px;
}
.hero__title {
    color: #fff;
    font-size: clamp(2.1rem, 4vw, 3rem);
    margin-bottom: 0.4em;
}
.hero__lede { color: #D9D5C7; max-width: 46ch; }
.hero__photo img, .hero__photo-placeholder {
    width: 100%;
    aspect-ratio: 1;
    border-radius: 50%;
    object-fit: cover;
    border: 4px solid var(--color-accent);
}
.hero__photo-placeholder {
    display: flex; align-items: center; justify-content: center;
    background: var(--color-ink-light);
    color: var(--color-accent);
    font-size: 3rem;
}

/* ---------- Buttons / links ---------- */
.btn {
    display: inline-block;
    padding: 12px 24px;
    border-radius: 999px;
    font-weight: 600;
    font-size: 0.95rem;
    margin-top: 8px;
}
.btn--accent { background: var(--color-accent); color: var(--color-ink); }
.btn--accent:hover { background: var(--color-accent-dark); }
.link-more {
    display: inline-block;
    margin-top: 20px;
    font-weight: 600;
    color: var(--color-ink);
    border-bottom: 2px solid var(--color-accent);
    padding-bottom: 2px;
}

/* ---------- Sections generic ---------- */
.section { padding: 64px 0; border-top: 1px solid var(--color-border); }
.section__title { font-size: 1.6rem; margin-bottom: 28px; }
.section--news { background: var(--color-paper-alt); }

/* ---------- Card grid (articles / videos) ---------- */
.card-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 28px;
}
.card-grid--wide { grid-template-columns: repeat(3, 1fr); }
.card {
    background: #fff;
    border: 1px solid var(--color-border);
    border-radius: var(--radius);
    overflow: hidden;
    transition: transform .15s ease, box-shadow .15s ease;
    display: flex;
    flex-direction: column;
}
.card:hover { transform: translateY(-3px); box-shadow: 0 10px 24px rgba(22,51,58,0.12); }
.card__image {
    height: 160px;
    background: var(--color-paper-alt) center/cover no-repeat;
}
.card__body { padding: 18px 20px 22px; }
.card__date { font-family: var(--font-mono); font-size: 0.78rem; color: var(--color-text-muted); }
.card__title { font-size: 1.15rem; margin: 6px 0 8px; }
.card__excerpt { color: var(--color-text-muted); font-size: 0.92rem; margin: 0; }

.card--video .card__image--video {
    position: relative;
    background-color: var(--color-ink);
    display: flex; align-items: center; justify-content: center;
}
.play-icon {
    width: 56px; height: 56px; border-radius: 50%;
    background: rgba(217,164,65,0.9);
    color: var(--color-ink);
    display: flex; align-items: center; justify-content: center;
    font-size: 1.1rem;
}

/* ---------- Timeline (krátké zprávy) ---------- */
.timeline { list-style: none; margin: 0; padding: 0; max-width: 720px; }
.timeline__item {
    display: grid;
    grid-template-columns: 90px 1fr;
    gap: 20px;
    padding: 18px 0;
    border-bottom: 1px dashed var(--color-border);
}
.timeline__date { font-family: var(--font-mono); color: var(--color-accent-dark); font-size: 0.85rem; }
.timeline__title { font-size: 1.05rem; margin: 0 0 4px; }
.timeline__content p { margin: 0; color: var(--color-text-muted); font-size: 0.94rem; }

/* ---------- Shelf (knihy) ---------- */
.shelf { display: grid; grid-template-columns: repeat(6, 1fr); gap: 22px; }
.shelf--full { grid-template-columns: repeat(6, 1fr); }
.shelf__item { display: flex; flex-direction: column; gap: 8px; }
.shelf__cover {
    aspect-ratio: 2/3;
    border-radius: 4px;
    object-fit: cover;
    box-shadow: 0 6px 16px rgba(22,51,58,0.15);
}
.shelf__cover--placeholder {
    display: flex; align-items: center; justify-content: center;
    background: var(--color-health);
    color: #fff; font-family: var(--font-display); font-size: 2rem;
}
.shelf__cover--big { aspect-ratio: auto; height: 100%; }
.shelf__title { font-size: 0.88rem; font-weight: 600; line-height: 1.3; }
.shelf__author { font-size: 0.78rem; color: var(--color-text-muted); }

/* ---------- Resource list (materiály) ---------- */
.resource-list { list-style: none; margin: 0; padding: 0; }
.resource-list__item { border-bottom: 1px solid var(--color-border); }
.resource-list__item a {
    display: flex; align-items: center; gap: 16px;
    padding: 16px 4px;
}
.resource-list__item a:hover { background: var(--color-paper-alt); }
.resource-list__icon {
    width: 36px; height: 36px; border-radius: 50%;
    background: var(--color-health); color: #fff;
    display: flex; align-items: center; justify-content: center;
    flex-shrink: 0;
}
.resource-list__title { display: block; font-weight: 600; }
.resource-list__meta { display: block; font-size: 0.8rem; color: var(--color-text-muted); font-family: var(--font-mono); }

/* ---------- Generic page / article ---------- */
.page__header { padding: 56px 0 24px; }
.page__title { font-size: clamp(1.8rem, 3.4vw, 2.6rem); }
.page__cover img { border-radius: var(--radius); margin: 24px 0; }
.prose { max-width: 68ch; }
.prose p { margin: 0 0 1.2em; }
.prose h2 { margin-top: 1.6em; }
.prose img { border-radius: var(--radius); }
.page__body { padding-bottom: 48px; }

.tag-list { list-style: none; display: flex; gap: 8px; padding: 0; margin: 14px 0 0; }
.tag {
    font-family: var(--font-mono); font-size: 0.75rem;
    background: var(--color-paper-alt); border: 1px solid var(--color-border);
    padding: 3px 10px; border-radius: 999px; color: var(--color-text-muted);
}

.post-nav { display: flex; justify-content: space-between; padding: 24px 0 64px; border-top: 1px solid var(--color-border); font-weight: 600; }

/* ---------- Book detail ---------- */
.book-detail { display: grid; grid-template-columns: 260px 1fr; gap: 40px; padding: 56px 0; }
.book-detail__rating { color: var(--color-accent-dark); font-size: 1.3rem; letter-spacing: 2px; }
.book-detail__author { color: var(--color-text-muted); font-style: italic; }

/* ---------- Video embed ---------- */
.video-embed { position: relative; padding-top: 56.25%; margin: 24px 0; border-radius: var(--radius); overflow: hidden; }
.video-embed iframe { position: absolute; inset: 0; width: 100%; height: 100%; border: 0; }

/* ---------- Downloads ---------- */
.downloads { margin-top: 32px; padding-top: 24px; border-top: 1px solid var(--color-border); }
.downloads__list { list-style: none; padding: 0; }
.downloads__list li { margin-bottom: 10px; }
.downloads__list a {
    display: inline-flex; align-items: center; gap: 8px;
    background: #fff; border: 1px solid var(--color-border);
    padding: 10px 16px; border-radius: 8px; font-weight: 600;
}
.downloads__list a:hover { border-color: var(--color-accent); }
.downloads__size { font-weight: 400; color: var(--color-text-muted); font-size: 0.85rem; }

/* ---------- About page ---------- */
.about-layout { display: grid; grid-template-columns: 280px 1fr; gap: 48px; padding: 56px 0; align-items: start; }
.about-layout__photo img, .about-layout__photo .hero__photo-placeholder {
    width: 100%; border-radius: var(--radius); aspect-ratio: 1; object-fit: cover;
    border: 4px solid var(--color-accent);
}
.subject-badges { list-style: none; display: flex; gap: 10px; padding: 0; margin: 20px 0; }
.subject-badge {
    font-family: var(--font-mono); font-size: 0.78rem; font-weight: 600;
    padding: 6px 14px; border-radius: 999px; color: #fff;
}
.subject-badge--it { background: var(--color-ink); }
.subject-badge--health { background: var(--color-health); }

/* ---------- Footer ---------- */
.site-footer {
    background: var(--color-ink);
    color: #C9C5B8;
    padding: 32px 0;
    margin-top: 40px;
    font-size: 0.88rem;
}
.site-footer a { color: var(--color-accent); }

/* ---------- Pagination ---------- */
.pagination { display: flex; gap: 8px; padding: 32px 0; }
.pagination a, .pagination span {
    padding: 8px 14px; border: 1px solid var(--color-border); border-radius: 6px;
}

/* ==========================================================================
   Responsive
   ========================================================================== */
@media (max-width: 860px) {
    .hero__inner { grid-template-columns: 1fr; text-align: left; }
    .hero__photo { width: 160px; margin: 0 0 24px; }
    .card-grid, .card-grid--wide { grid-template-columns: repeat(2, 1fr); }
    .shelf, .shelf--full { grid-template-columns: repeat(3, 1fr); }
    .book-detail, .about-layout { grid-template-columns: 1fr; }
    .book-detail__cover, .about-layout__photo { max-width: 220px; }
}

@media (max-width: 600px) {
    .nav-toggle { display: flex; }
    .primary-nav {
        display: none;
        position: absolute; top: 68px; left: 0; right: 0;
        background: var(--color-ink);
        padding: 12px 24px 24px;
    }
    .primary-nav.is-open { display: block; }
    .primary-nav ul { flex-direction: column; gap: 14px; }
    .card-grid, .card-grid--wide { grid-template-columns: 1fr; }
    .shelf, .shelf--full { grid-template-columns: repeat(2, 1fr); }
    .timeline__item { grid-template-columns: 70px 1fr; }
}

@media (prefers-reduced-motion: reduce) {
    html { scroll-behavior: auto; }
    .card { transition: none; }
}