/* =========================================================================
   Aurora — front-end stylesheet for BuCMS.
   Fast, corporate editorial theme. No external fonts or frameworks; only the
   CSS the theme needs. The accent colour is injected as --aurora-accent.
   ========================================================================= */

:root {
    --aurora-accent: #2b59ff;
    --aurora-accent-dark: #1e3fb8;
    --ink: #14161c;
    --ink-soft: #454b58;
    --ink-faint: #838b9c;
    --line: #e6e8ef;
    --line-soft: #f0f2f7;
    --bg: #ffffff;
    --bg-soft: #f6f8fc;
    --bg-deep: #0f1320;
    --radius: 14px;
    --radius-lg: 20px;
    --wrap: 1160px;
    --measure: 720px;
    /* Display serif for headings; a comfortable reading serif for article body;
       a modern sans for UI. All system-available — no external font downloads. */
    --serif: "Iowan Old Style", "Palatino Linotype", Palatino, "Book Antiqua", Georgia, ui-serif, serif;
    --reading: Charter, "Bitstream Charter", "Sitka Text", Cambria, "Palatino Linotype", Georgia, ui-serif, serif;
    --sans: system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;
    --shadow-sm: 0 1px 2px rgba(20,22,28,.06), 0 1px 3px rgba(20,22,28,.04);
    --shadow-md: 0 8px 24px rgba(20,22,28,.08);
    --shadow-lg: 0 18px 44px rgba(20,22,28,.12);
}

* { box-sizing: border-box; }
html { -webkit-text-size-adjust: 100%; scroll-behavior: smooth; }
body {
    margin: 0;
    font-family: var(--sans);
    color: var(--ink);
    background: var(--bg);
    line-height: 1.65;
    font-size: 17px;
    -webkit-font-smoothing: antialiased;
    text-rendering: optimizeLegibility;
    font-feature-settings: "kern" 1, "liga" 1;
}
img { max-width: 100%; height: auto; display: block; }
a { color: var(--aurora-accent); text-decoration: none; }
a:hover { text-decoration: underline; }
:focus-visible { outline: 2px solid var(--aurora-accent); outline-offset: 2px; border-radius: 3px; }

.wrap { max-width: var(--wrap); margin: 0 auto; padding: 0 24px; }

/* ---- Skip link (accessibility): hidden until focused ---- */
.skip-link { position: absolute; left: -9999px; top: 0; background: var(--ink); color: #fff; padding: 10px 16px; z-index: 200; border-radius: 0 0 8px 0; }
.skip-link:focus { left: 0; }

/* ---- Header ---- */
.site-header {
    background: rgba(255,255,255,.9);
    backdrop-filter: saturate(180%) blur(12px);
    -webkit-backdrop-filter: saturate(180%) blur(12px);
    border-bottom: 1px solid var(--line);
    z-index: 100;
}
.site-header .wrap { display: flex; align-items: center; gap: 20px; min-height: 70px; }
.brand { font-weight: 800; font-size: 21px; letter-spacing: -.5px; color: var(--ink); display: inline-flex; align-items: center; }
.brand:hover { text-decoration: none; }
.brand-logo { max-height: 40px; width: auto; }

/* ---- Navigation ---- */
.header-nav { margin-left: auto; }
.nav-menu, .nav-submenu { list-style: none; margin: 0; padding: 0; }
.nav-menu { display: flex; align-items: center; gap: 2px; }
.nav-item { position: relative; }
.nav-item > a {
    display: block; padding: 9px 15px; border-radius: 9px;
    color: var(--ink-soft); font-weight: 550; font-size: 15px;
    transition: color .15s, background .15s;
}
.nav-item > a:hover { color: var(--ink); background: var(--bg-soft); text-decoration: none; }
.nav-item.has-children > a::after { content: "▾"; margin-left: 5px; font-size: 11px; color: var(--ink-faint); }
.nav-submenu {
    position: absolute; top: 100%; left: 0; min-width: 200px;
    background: #fff; border: 1px solid var(--line); border-radius: 12px;
    box-shadow: var(--shadow-lg);
    padding: 7px; opacity: 0; visibility: hidden; transform: translateY(8px);
    transition: opacity .16s, transform .16s, visibility .16s;
}
.nav-item:hover > .nav-submenu, .nav-item:focus-within > .nav-submenu { opacity: 1; visibility: visible; transform: translateY(0); }
.nav-submenu .nav-item > a { padding: 8px 12px; font-size: 14.5px; }
.nav-submenu .nav-submenu { top: 0; left: 100%; }

/* ---- Mobile nav toggle (hamburger) ---- */
.nav-toggle {
    display: none; margin-left: auto; width: 44px; height: 44px;
    border: 1px solid var(--line); border-radius: 10px; background: #fff;
    cursor: pointer; padding: 0; align-items: center; justify-content: center;
    flex-direction: column; gap: 5px;
}
.nav-toggle-bar { display: block; width: 20px; height: 2px; background: var(--ink); border-radius: 2px; transition: transform .2s, opacity .2s; }
.nav-toggle.is-active .nav-toggle-bar:nth-child(1) { transform: translateY(7px) rotate(45deg); }
.nav-toggle.is-active .nav-toggle-bar:nth-child(2) { opacity: 0; }
.nav-toggle.is-active .nav-toggle-bar:nth-child(3) { transform: translateY(-7px) rotate(-45deg); }

/* ---- Search ---- */
.header-search { display: flex; align-items: center; }
.header-search input {
    border: 1px solid var(--line); border-radius: 999px; padding: 8px 15px;
    font: inherit; font-size: 14px; width: 190px; background: var(--bg-soft);
    transition: width .2s, background .2s, border-color .2s;
}
.header-search input:focus { width: 240px; background: #fff; outline: none; border-color: var(--aurora-accent); }
.header-search-mobile { display: none; }

/* ---- Hero (corporate: deep gradient + subtle grid pattern) ---- */
.hero { position: relative; overflow: hidden; background: var(--bg-deep); color: #fff; }
.hero-bg {
    position: absolute; inset: 0; pointer-events: none;
    background:
        radial-gradient(1100px 500px at 78% -8%, color-mix(in srgb, var(--aurora-accent) 55%, transparent), transparent 60%),
        radial-gradient(760px 420px at 8% 108%, color-mix(in srgb, var(--aurora-accent) 30%, transparent), transparent 55%),
        linear-gradient(180deg, #131829 0%, #0f1320 100%);
}
.hero-bg::after {
    content: ""; position: absolute; inset: 0; opacity: .5;
    background-image:
        linear-gradient(rgba(255,255,255,.04) 1px, transparent 1px),
        linear-gradient(90deg, rgba(255,255,255,.04) 1px, transparent 1px);
    background-size: 44px 44px;
    -webkit-mask-image: radial-gradient(70% 70% at 50% 30%, #000 40%, transparent 100%);
    mask-image: radial-gradient(70% 70% at 50% 30%, #000 40%, transparent 100%);
}
.hero-inner { position: relative; padding: 108px 24px 96px; }
.hero-eyebrow {
    display: inline-flex; align-items: center; gap: 8px; font-size: 12.5px; font-weight: 700;
    letter-spacing: .16em; text-transform: uppercase;
    color: #fff; background: color-mix(in srgb, var(--aurora-accent) 78%, transparent);
    padding: 7px 14px; border-radius: 999px; margin-bottom: 24px;
    box-shadow: 0 4px 16px color-mix(in srgb, var(--aurora-accent) 45%, transparent);
}
.hero h1 {
    font-family: var(--serif); font-weight: 700; letter-spacing: -.025em;
    font-size: clamp(36px, 6.2vw, 66px); line-height: 1.04; margin: 0 0 22px; max-width: 17ch;
    color: #fff;
}
.hero p { font-size: clamp(17px, 2.2vw, 22px); color: rgba(255,255,255,.76); max-width: 54ch; margin: 0; line-height: 1.55; }

/* ---- Section heading ---- */
.section { padding: 56px 0; }
.section-head { display: flex; align-items: baseline; justify-content: space-between; margin-bottom: 30px; gap: 16px; }
.section-head h2 {
    font-family: var(--serif); font-size: 27px; font-weight: 700; letter-spacing: -.01em; margin: 0;
    position: relative; padding-bottom: 12px;
}
.section-head h2::after { content: ""; position: absolute; left: 0; bottom: 0; width: 46px; height: 3px; background: var(--aurora-accent); border-radius: 3px; }
.empty-note { color: var(--ink-faint); font-size: 16px; padding: 40px 0; }

/* ---- Post grid + cards ---- */
.grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: 28px; }
.card { border: 1px solid var(--line); border-radius: var(--radius-lg); overflow: hidden; background: #fff; transition: transform .18s, box-shadow .18s, border-color .18s; display: flex; flex-direction: column; }
.card:hover { transform: translateY(-4px); box-shadow: var(--shadow-lg); border-color: transparent; }
.card-media { display: block; aspect-ratio: 16 / 9; overflow: hidden; background: var(--bg-soft); }
.card-img { width: 100%; height: 100%; object-fit: cover; transition: transform .45s; }
.card:hover .card-img { transform: scale(1.05); }
.card-body { padding: 22px 22px 24px; display: flex; flex-direction: column; gap: 11px; flex: 1; }
.card-title { font-family: var(--serif); font-size: 20px; line-height: 1.28; font-weight: 700; margin: 0; letter-spacing: -.01em; }
.card-title a { color: var(--ink); }
.card-title a:hover { color: var(--aurora-accent); text-decoration: none; }
.card-excerpt { color: var(--ink-soft); font-size: 15px; margin: 0; flex: 1; }
.card-meta { display: flex; align-items: center; gap: 10px; font-size: 13px; color: var(--ink-faint); margin-top: 6px; }
.card-meta .card-author { font-weight: 600; color: var(--ink-soft); }
.card-meta a.card-author:hover { color: var(--aurora-accent); }
.card-meta .card-author::after { content: "·"; margin-left: 10px; color: var(--line); }

/* ---- Article layout (single/page/archive) with optional sidebar ---- */
.article-wrap { padding-top: 56px; padding-bottom: 56px; }
.article-layout.has-sidebar .article-wrap {
    display: grid; grid-template-columns: minmax(0, 1fr) 320px; gap: 52px; align-items: start;
}
.article { min-width: 0; }
.article-page { max-width: var(--measure); margin: 0 auto; }

/* ---- Article header ---- */
.article-head { max-width: var(--measure); margin: 0 auto 34px; text-align: center; }
.has-sidebar .article-head { margin-left: 0; margin-right: 0; text-align: left; }
.article-eyebrow { font-size: 12.5px; font-weight: 700; letter-spacing: .12em; text-transform: uppercase; color: var(--aurora-accent); }
.article-cats { display: flex; flex-wrap: wrap; gap: 8px; justify-content: center; margin-bottom: 16px; }
.has-sidebar .article-cats { justify-content: flex-start; }
.article-cats a {
    font-size: 12.5px; font-weight: 700; letter-spacing: .04em; text-transform: uppercase;
    color: var(--aurora-accent); background: color-mix(in srgb, var(--aurora-accent) 10%, transparent);
    padding: 5px 12px; border-radius: 999px;
}
.article-cats a:hover { text-decoration: none; background: color-mix(in srgb, var(--aurora-accent) 18%, transparent); }
.article-head h1 { font-family: var(--serif); font-size: clamp(30px, 5vw, 46px); line-height: 1.12; letter-spacing: -.02em; margin: 16px 0 18px; }
.has-sidebar .article-head h1 { margin-top: 12px; }
.article-meta { display: flex; align-items: center; gap: 12px; color: var(--ink-faint); font-size: 14.5px; }
.article-head:not(.has-sidebar *) .article-meta,
.article-layout:not(.has-sidebar) .article-meta { justify-content: center; }
.has-sidebar .article-meta { justify-content: flex-start; }
.article-meta .meta-author { font-weight: 600; color: var(--ink-soft); }
.article-meta a.meta-author:hover { color: var(--aurora-accent); }
.article-meta .dot { width: 3px; height: 3px; border-radius: 50%; background: var(--ink-faint); flex: none; }

/* ---- Featured image: its own block, clear separation from text ---- */
.article-feature { max-width: 960px; margin: 0 auto 40px; border-radius: var(--radius-lg); overflow: hidden; box-shadow: var(--shadow-md); }
.has-sidebar .article-feature { max-width: none; margin-left: 0; margin-right: 0; }
.article-feature img { width: 100%; display: block; }

/* ---- Prose ---- */
.prose { max-width: var(--measure); margin: 0 auto; font-family: var(--reading); font-size: 19px; line-height: 1.8; color: #22252d; letter-spacing: -.002em; }
.has-sidebar .prose { margin-left: 0; margin-right: 0; max-width: none; }
.prose > * + * { margin-top: 1.2em; }
.prose h2 { font-family: var(--serif); font-size: 28px; margin-top: 1.9em; letter-spacing: -.01em; line-height: 1.25; }
.prose h3 { font-family: var(--serif); font-size: 22px; margin-top: 1.6em; }
.prose img { border-radius: 12px; margin: 1.7em auto; box-shadow: var(--shadow-sm); }
.prose a { color: var(--aurora-accent); text-decoration: underline; text-underline-offset: 2px; }
.prose blockquote { border-left: 3px solid var(--aurora-accent); padding: 4px 0 4px 22px; margin: 1.6em 0; color: var(--ink-soft); font-style: italic; font-size: 1.05em; }
.prose ul, .prose ol { padding-left: 1.4em; }
.prose li + li { margin-top: .4em; }
.prose pre { background: var(--bg-deep); color: #e6e8ee; padding: 20px; border-radius: 12px; overflow-x: auto; font-size: 14.5px; line-height: 1.6; }
.prose code { font-family: ui-monospace, SFMono-Regular, Menlo, monospace; font-size: .92em; }
.prose :not(pre) > code { background: var(--bg-soft); padding: 2px 6px; border-radius: 5px; color: var(--aurora-accent-dark); }
.prose hr { border: 0; border-top: 1px solid var(--line); margin: 2.2em 0; }

/* ---- Shortcode button ---- */
.bc-sc-button { display: inline-block; padding: 12px 22px; border-radius: 11px; background: var(--aurora-accent); color: #fff; font-weight: 600; box-shadow: 0 6px 16px color-mix(in srgb, var(--aurora-accent) 30%, transparent); }
.bc-sc-button:hover { text-decoration: none; filter: brightness(1.07); }
.bc-sc-button-ghost { background: transparent; color: var(--aurora-accent); border: 1px solid var(--aurora-accent); box-shadow: none; }

/* ---- Sidebar ---- */
.sidebar { display: flex; flex-direction: column; gap: 28px; position: sticky; top: 92px; }
.widget { background: #fff; border: 1px solid var(--line); border-radius: var(--radius); padding: 22px; }
.widget-title { font-family: var(--serif); font-size: 17px; font-weight: 700; margin: 0 0 16px; padding-bottom: 12px; border-bottom: 1px solid var(--line-soft); position: relative; }
.widget-title::after { content: ""; position: absolute; left: 0; bottom: -1px; width: 34px; height: 2px; background: var(--aurora-accent); }
.widget-list { list-style: none; margin: 0; padding: 0; }
.widget-list li { display: flex; align-items: center; justify-content: space-between; gap: 10px; padding: 8px 0; border-bottom: 1px solid var(--line-soft); }
.widget-list li:last-child { border-bottom: 0; }
.widget-list a { color: var(--ink-soft); font-size: 15px; font-weight: 500; }
.widget-list a:hover { color: var(--aurora-accent); text-decoration: none; }
.widget-count { font-size: 12px; color: var(--ink-faint); background: var(--bg-soft); padding: 2px 9px; border-radius: 999px; flex: none; }
.widget-recent li { display: block; padding: 11px 0; }
.widget-recent a { display: block; font-weight: 600; color: var(--ink); line-height: 1.4; }
.widget-recent a:hover { color: var(--aurora-accent); }
.widget-recent time { display: block; font-size: 12.5px; color: var(--ink-faint); margin-top: 4px; }
.tag-cloud { display: flex; flex-wrap: wrap; gap: 8px; }
.tag-chip { font-size: 13px; color: var(--ink-soft); background: var(--bg-soft); border: 1px solid var(--line); padding: 6px 12px; border-radius: 999px; transition: all .15s; }
.tag-chip:hover { color: #fff; background: var(--aurora-accent); border-color: var(--aurora-accent); text-decoration: none; }

/* ---- Archive header ---- */
.archive-head { padding: 66px 0 30px; border-bottom: 1px solid var(--line); background: var(--bg-soft); }
.archive-head .kind { font-size: 12.5px; font-weight: 700; letter-spacing: .12em; text-transform: uppercase; color: var(--aurora-accent); }
.archive-head h1 { font-family: var(--serif); font-size: clamp(30px, 5vw, 44px); margin: 12px 0 0; letter-spacing: -.02em; }
.archive-head .archive-desc { color: var(--ink-soft); margin: 12px 0 0; max-width: 62ch; font-size: 16px; }
.archive-main { min-width: 0; }
.archive-main .grid { grid-template-columns: repeat(2, 1fr); }
.article-layout:not(.has-sidebar) .archive-main .grid { grid-template-columns: repeat(3, 1fr); }

/* ---- Pagination ---- */
.pagination { display: flex; gap: 8px; justify-content: center; margin-top: 48px; flex-wrap: wrap; }
.pagination a, .pagination span {
    min-width: 42px; height: 42px; display: inline-flex; align-items: center; justify-content: center;
    border: 1px solid var(--line); border-radius: 11px; font-size: 14px; font-weight: 600; color: var(--ink-soft); padding: 0 12px;
}
.pagination a:hover { border-color: var(--aurora-accent); color: var(--aurora-accent); text-decoration: none; }
.pagination .is-current { background: var(--aurora-accent); border-color: var(--aurora-accent); color: #fff; }

/* ---- Password form ---- */
.pw-gate { max-width: 460px; margin: 96px auto; text-align: center; padding: 0 24px; }
.pw-gate h1 { font-family: var(--serif); font-size: 30px; margin-bottom: 10px; }
.pw-gate p { color: var(--ink-soft); }
.pw-form { display: flex; gap: 8px; margin-top: 22px; }
.pw-form input { flex: 1; padding: 13px 15px; border: 1px solid var(--line); border-radius: 11px; font: inherit; }
.pw-form input:focus { outline: none; border-color: var(--aurora-accent); }
.pw-form button { padding: 13px 24px; border: 0; border-radius: 11px; background: var(--aurora-accent); color: #fff; font-weight: 600; cursor: pointer; }
.pw-error { color: #c0392b; margin-top: 14px; }

/* ---- 404 / notice ---- */
.notice-block { max-width: 560px; margin: 104px auto; text-align: center; padding: 0 24px; }
.notice-block h1 { font-family: var(--serif); font-size: clamp(56px, 12vw, 96px); margin: 0 0 10px; letter-spacing: -.03em; background: linear-gradient(135deg, var(--aurora-accent), var(--aurora-accent-dark)); -webkit-background-clip: text; background-clip: text; -webkit-text-fill-color: transparent; }
.notice-block p { color: var(--ink-soft); font-size: 18px; margin-bottom: 26px; }

/* ---- Footer ---- */
.site-footer { border-top: 1px solid var(--line); background: var(--bg-soft); margin-top: 72px; }
.site-footer .wrap { padding-top: 44px; padding-bottom: 44px; }
.footer-grid { display: flex; align-items: center; justify-content: space-between; gap: 20px; flex-wrap: wrap; }
.footer-menu ul { list-style: none; display: flex; gap: 20px; margin: 0; padding: 0; flex-wrap: wrap; }
.footer-menu a { color: var(--ink-soft); font-size: 14.5px; }
.footer-menu a:hover { color: var(--aurora-accent); }
.footer-copy { color: var(--ink-faint); font-size: 14px; }

/* ---- Lazy images fade-in ---- */
img[data-bc-lazy] { opacity: 0; transition: opacity .4s; }
img[data-bc-lazy].bc-loaded, img[data-bc-lazy][src]:not([data-bc-lazy=""]) { opacity: 1; }

/* ---- Responsive ---- */
@media (max-width: 1000px) {
    .article-layout.has-sidebar .article-wrap { grid-template-columns: 1fr; gap: 40px; }
    .sidebar { position: static; flex-direction: row; flex-wrap: wrap; }
    .sidebar .widget { flex: 1 1 260px; }
}
@media (max-width: 900px) {
    .grid, .archive-main .grid, .article-layout:not(.has-sidebar) .archive-main .grid { grid-template-columns: repeat(2, 1fr); }
}
@media (max-width: 760px) {
    /* Mobile navigation */
    .nav-toggle { display: flex; }
    .header-search-desktop { display: none; }
    .header-nav {
        position: fixed; inset: 70px 0 auto 0; margin: 0;
        background: #fff; border-bottom: 1px solid var(--line);
        box-shadow: var(--shadow-lg);
        max-height: 0; overflow: hidden; visibility: hidden;
        transition: max-height .28s ease, visibility .28s;
    }
    .header-nav.is-open { max-height: calc(100vh - 70px); overflow-y: auto; visibility: visible; }
    .nav-menu { flex-direction: column; align-items: stretch; gap: 0; padding: 12px 16px 8px; }
    .nav-item { border-bottom: 1px solid var(--line-soft); }
    .nav-item:last-child { border-bottom: 0; }
    .nav-item > a { padding: 13px 12px; font-size: 16px; border-radius: 8px; }
    /* Submenu toggle button (mobile only) sits to the right of a parent link. */
    .nav-item.has-children { display: flex; flex-wrap: wrap; align-items: center; }
    .nav-item.has-children > a { flex: 1; }
    .nav-item.has-children > a::after { content: none; }
    .submenu-toggle {
        display: inline-flex; align-items: center; justify-content: center;
        width: 40px; height: 44px; border: 0; background: none; cursor: pointer;
        color: var(--ink-faint); font-size: 13px; flex: none;
    }
    .submenu-toggle::before { content: "▾"; transition: transform .2s; }
    .nav-item.is-expanded > .submenu-toggle::before { transform: rotate(180deg); }
    /* Submenus start collapsed on mobile, expand on tap. */
    .nav-submenu {
        position: static; opacity: 1; visibility: visible; transform: none;
        box-shadow: none; border: 0; padding: 0; min-width: 0;
        flex-basis: 100%;
        max-height: 0; overflow: hidden; transition: max-height .25s ease;
    }
    .nav-item.is-expanded > .nav-submenu { max-height: 600px; padding: 0 0 6px 16px; }
    .header-search-mobile { display: flex; padding: 8px 16px 16px; }
    .header-search-mobile input { width: 100%; }
}
@media (max-width: 640px) {
    body { font-size: 16px; }
    .grid, .archive-main .grid, .article-layout:not(.has-sidebar) .archive-main .grid { grid-template-columns: 1fr; gap: 22px; }
    .hero-inner { padding: 72px 24px 60px; }
    .article-wrap { padding-top: 36px; }
    .sidebar { flex-direction: column; }
    .section { padding: 40px 0; }
}

/* ---- Reduced motion ---- */
@media (prefers-reduced-motion: reduce) {
    html { scroll-behavior: auto; }
    * { transition: none !important; animation: none !important; }
    .card:hover { transform: none; }
    .card:hover .card-img { transform: none; }
}

/* ---- Footer sitemap link ---- */
.footer-sitemap { margin-left: 14px; color: var(--ink-faint); font-size: 13.5px; }
.footer-sitemap:hover { color: var(--aurora-accent); }

/* ---- Footer menu (always flat, never a dropdown) ---- */
.footer-menu-list { list-style: none; display: flex; gap: 20px; margin: 0; padding: 0; flex-wrap: wrap; }
.footer-menu-list a { color: var(--ink-soft); font-size: 14.5px; }
.footer-menu-list a:hover { color: var(--aurora-accent); }

/* ---- Article tags (bottom of single post) ---- */
.article-tags { max-width: var(--measure); margin: 44px auto 0; padding-top: 28px; border-top: 1px solid var(--line); display: flex; flex-wrap: wrap; align-items: center; gap: 10px; }
.has-sidebar .article-tags { max-width: none; margin-left: 0; margin-right: 0; }
.article-tags-label { font-weight: 700; font-size: 13px; color: var(--ink-faint); text-transform: uppercase; letter-spacing: .06em; margin-right: 4px; }