/*
Theme Name: BlueSign Blog
Theme URI: https://blog.bluesign.com.tw/
Author: 藍訊科技
Description: 藍訊科技部落格佈景主題。色票與元件沿用官網 DESIGN.md（平面卡片、品牌藍只給可點元素、右下 LINE 按鈕）。
Version: 1.0.0
Requires PHP: 8.0
Text Domain: bluesign-blog
*/

:root {
  --brand: #0757d7;
  --brand-deep: #064cae;
  --ink: #102e53;
  --body: #405a78;
  --muted: #586f87;
  --label: #1f5da3;
  --night: #10243f;
  --line: #d6e2ef;
  --line-strong: #8fb2d9;
  --paper: #ffffff;
  --mist: #f6f9fc;
  --tint: #eaf2fc;
  --lime: #d9f063;
  --line-green: #087d3d;
  --overlay: 0 12px 30px rgb(0 0 0 / .14);
  --font: "Noto Sans TC", "Noto Sans CJK TC", "PingFang TC", "Microsoft JhengHei", system-ui, sans-serif;
  --wrap: 1240px;
}

*, *::before, *::after { box-sizing: border-box; }
html { -webkit-text-size-adjust: 100%; scroll-behavior: smooth; }
body { margin: 0; background: var(--paper); color: var(--body); font: 400 16px/1.75 var(--font); }
img { max-width: 100%; height: auto; }
a { color: var(--brand); text-decoration: none; }
a:hover { text-decoration: underline; }
a:focus-visible, button:focus-visible, input:focus-visible, summary:focus-visible { outline: 3px solid var(--brand); outline-offset: 2px; }
h1, h2, h3, h4 { color: var(--ink); font-weight: 800; letter-spacing: -.03em; line-height: 1.3; margin: 0; }
.wrap { width: min(100% - 32px, var(--wrap)); margin-inline: auto; }
.sr-only { position: absolute; width: 1px; height: 1px; overflow: hidden; clip: rect(0 0 0 0); white-space: nowrap; }
.skip { position: absolute; left: -999px; top: 8px; background: var(--paper); padding: 8px 12px; z-index: 50; }
.skip:focus { left: 8px; }

/* ---- 頂端工具列 ---- */
.utility { background: var(--night); color: #fff; font-size: 12px; font-weight: 750; }
.utility .wrap { display: flex; justify-content: space-between; align-items: center; gap: 12px; min-height: 34px; }
.utility a { color: #fff; }
.utility nav { display: flex; gap: 16px; }

/* ---- 主選單 ---- */
.site-header { background: var(--paper); border-bottom: 1px solid var(--line); position: sticky; top: 0; z-index: 20; }
.site-header .wrap { display: flex; align-items: center; gap: 24px; min-height: 64px; }
.brand { display: flex; align-items: center; gap: 10px; color: var(--ink); font-weight: 800; white-space: nowrap; }
.brand img { height: 30px; width: auto; }
.brand span { font-size: 15px; border-left: 1px solid var(--line); padding-left: 10px; }
.brand:hover { text-decoration: none; }
.main-nav { display: flex; gap: 18px; flex: 1; }
.main-nav a { color: var(--ink); font-size: 14px; font-weight: 750; padding: 20px 0 18px; border-bottom: 2px solid transparent; white-space: nowrap; }
.main-nav a:hover, .main-nav a[aria-current] { border-bottom-color: var(--brand); text-decoration: none; }
.header-actions { display: flex; align-items: center; gap: 10px; }
.icon-btn { display: inline-grid; place-items: center; width: 40px; height: 40px; border: 1px solid var(--line); border-radius: 4px; color: var(--ink); background: var(--paper); cursor: pointer; }
.icon-btn:hover { border-color: var(--line-strong); text-decoration: none; }
.icon-btn svg { width: 20px; height: 20px; fill: none; stroke: currentColor; stroke-width: 2; }
.button { display: inline-flex; align-items: center; gap: 6px; background: var(--brand); color: #fff; border-radius: 4px; padding: 10px 18px; font-size: 14px; font-weight: 750; line-height: 1.4; border: 0; cursor: pointer; white-space: nowrap; }
.button:hover { background: var(--brand-deep); text-decoration: none; }
.button.line { background: var(--line-green); }
.button.line:hover { background: #066a33; }
.button.ghost { background: var(--paper); color: var(--brand); border: 1px solid var(--line-strong); }
.button.ghost:hover { background: var(--tint); }
.menu-toggle { display: none; }
.search-panel { display: none; border-top: 1px solid var(--line); padding: 12px 0; }
.search-panel.open { display: block; }

.searchform { display: flex; gap: 8px; }
.searchform input { flex: 1; min-width: 0; font: inherit; font-size: 16px; padding: 9px 12px; border: 1px solid var(--line-strong); border-radius: 4px; color: var(--ink); }

/* ---- 首頁 ---- */
.hero { background: var(--mist); border-bottom: 1px solid var(--line); padding: 44px 0 36px; }
.hero h1 { font-size: clamp(30px, 3.4vw, 48px); line-height: 1.22; }
.hero p { margin: 12px 0 22px; max-width: 40em; font-size: 17px; }
.hero .searchform { max-width: 560px; }
.cat-strip { display: flex; flex-wrap: wrap; gap: 8px; margin-top: 22px; padding: 0; list-style: none; }
.chip { display: inline-flex; align-items: center; gap: 6px; background: var(--tint); color: var(--label); border-radius: 999px; padding: 4px 12px; font-size: 13px; font-weight: 750; line-height: 1.5; }
.chip small { font-size: 12px; font-weight: 400; color: var(--muted); }
a.chip:hover { background: #dce9f9; text-decoration: none; }
.chip.is-current { background: var(--ink); color: #fff; }
.chip.is-current small { color: #dfe8f3; }

.section { padding: 48px 0; }
.section.alt { background: var(--mist); }
.section-head { display: flex; justify-content: space-between; align-items: baseline; gap: 16px; margin-bottom: 20px; }
.section-head h2 { font-size: clamp(22px, 2.2vw, 30px); }
.section-head p { margin: 4px 0 0; color: var(--muted); font-size: 14px; }
.more { font-size: 14px; font-weight: 750; white-space: nowrap; }

.grid { display: grid; grid-template-columns: repeat(3, minmax(0, 1fr)); gap: 22px; }
.card { display: flex; flex-direction: column; background: var(--paper); border: 1px solid var(--line); border-radius: 6px; overflow: hidden; color: inherit; }
.card:hover { border-color: var(--line-strong); text-decoration: none; }
.card .thumb { aspect-ratio: 16 / 10; background: var(--tint); overflow: hidden; }
.card .thumb img { width: 100%; height: 100%; object-fit: cover; display: block; }
.card .thumb.empty { display: grid; place-items: center; color: var(--label); font-weight: 800; font-size: 15px; padding: 16px; text-align: center; }
.card .body { padding: 14px 18px 18px; display: flex; flex-direction: column; gap: 6px; flex: 1; }
.card .meta { display: flex; align-items: center; gap: 8px; font-size: 13px; color: var(--muted); flex-wrap: wrap; }
.card .meta .chip { font-size: 12px; padding: 2px 8px; }
.card h3 { font-size: 17px; font-weight: 750; line-height: 1.45; }
.card:hover h3 { color: var(--brand); }
.card p { margin: 0; font-size: 14px; line-height: 1.7; color: var(--body); display: -webkit-box; -webkit-line-clamp: 3; -webkit-box-orient: vertical; overflow: hidden; }

.lead { display: grid; grid-template-columns: 1.35fr 1fr; gap: 22px; margin-bottom: 22px; }
.lead .card .thumb { aspect-ratio: 16 / 9; }
.lead .card h3 { font-size: 22px; font-weight: 800; }
.lead-list { display: grid; gap: 12px; align-content: start; }
.row { display: grid; grid-template-columns: 132px 1fr; gap: 14px; align-items: start; background: var(--paper); border: 1px solid var(--line); border-radius: 6px; padding: 10px; color: inherit; }
.row:hover { border-color: var(--line-strong); text-decoration: none; }
.row .thumb { aspect-ratio: 4 / 3; border-radius: 4px; overflow: hidden; background: var(--tint); }
.row .thumb img { width: 100%; height: 100%; object-fit: cover; display: block; }
.row h3 { font-size: 15px; font-weight: 750; line-height: 1.5; }
.row:hover h3 { color: var(--brand); }
.row .meta { font-size: 12px; color: var(--muted); margin-top: 4px; }

.group-grid { display: grid; grid-template-columns: repeat(3, minmax(0, 1fr)); gap: 22px; }
.group { background: var(--paper); border: 1px solid var(--line); border-radius: 6px; padding: 18px; display: flex; flex-direction: column; gap: 10px; }
.group h3 { font-size: 18px; }
.group h3 a { color: var(--ink); }
.group h3 a:hover { color: var(--brand); }
.group > p { margin: 0; font-size: 14px; color: var(--muted); }
.group ul { list-style: none; padding: 0; margin: 4px 0 0; display: grid; gap: 6px; }
.group li a { color: var(--body); font-size: 14px; line-height: 1.55; display: block; }
.group li a:hover { color: var(--brand); }
.group li time { color: var(--muted); font-size: 12px; margin-right: 6px; }

/* ---- 分類頁 ---- */
.page-head { background: var(--mist); border-bottom: 1px solid var(--line); padding: 30px 0 26px; }
.page-head h1 { font-size: clamp(26px, 3vw, 40px); }
.page-head p { margin: 8px 0 0; max-width: 46em; }
.crumbs { font-size: 13px; color: var(--muted); margin-bottom: 10px; }
.crumbs a { color: var(--label); }
.crumbs span[aria-hidden] { margin: 0 6px; }
.pagination { display: flex; flex-wrap: wrap; gap: 6px; justify-content: center; margin-top: 36px; }
.pagination .page-numbers { min-width: 40px; height: 40px; display: inline-grid; place-items: center; padding: 0 10px; border: 1px solid var(--line); border-radius: 4px; font-size: 14px; color: var(--ink); background: var(--paper); }
.pagination a.page-numbers:hover { border-color: var(--line-strong); text-decoration: none; }
.pagination .current { background: var(--ink); color: #fff; border-color: var(--ink); }
.empty-state { padding: 40px 0; }

/* ---- 文章頁 ---- */
.article-head { padding: 32px 0 20px; }
.article-head .inner, .article-body, .article-foot { max-width: 760px; margin-inline: auto; }
.article-head h1 { font-size: clamp(26px, 3.2vw, 40px); line-height: 1.3; }
.article-meta { display: flex; flex-wrap: wrap; align-items: center; gap: 8px 12px; margin-top: 14px; font-size: 14px; color: var(--muted); }
.article-body { font-size: 17px; line-height: 1.85; color: var(--body); overflow-wrap: anywhere; }
.article-body > * { margin: 0 0 1.1em; }
.article-body h2 { font-size: 24px; margin: 1.8em 0 .7em; }
.article-body h3 { font-size: 20px; margin: 1.5em 0 .6em; }
.article-body strong { color: var(--ink); }
.article-body figure { margin: 1.4em 0; }
.article-body figure img { display: block; margin-inline: auto; border-radius: 6px; }
.article-body ul, .article-body ol { padding-left: 1.4em; }
.article-body li { margin: .3em 0; }
.article-body blockquote { margin: 1.4em 0; padding: 4px 0 4px 18px; border-left: 3px solid var(--line-strong); color: var(--ink); }
.article-body .video { position: relative; aspect-ratio: 16 / 9; }
.article-body .video iframe { position: absolute; inset: 0; width: 100%; height: 100%; border: 0; border-radius: 6px; }
.article-body .wp-block-table { overflow-x: auto; }
.article-body table { border-collapse: collapse; width: 100%; font-size: 15px; }
.article-body td, .article-body th { border: 1px solid var(--line); padding: 8px 10px; vertical-align: top; }
.article-body th { background: var(--mist); color: var(--ink); }
.tags { display: flex; flex-wrap: wrap; gap: 8px; margin: 28px 0 0; padding: 0; list-style: none; }
.cta { margin: 36px 0 0; border: 1px solid var(--line); border-radius: 6px; padding: 22px; background: var(--mist); display: grid; grid-template-columns: 1fr auto; gap: 16px; align-items: center; }
.cta h2 { font-size: 20px; }
.cta p { margin: 6px 0 0; font-size: 15px; }
.cta .actions { display: flex; gap: 10px; flex-wrap: wrap; }
.post-nav { display: grid; grid-template-columns: 1fr 1fr; gap: 16px; margin: 28px 0 0; }
.post-nav a { display: block; border: 1px solid var(--line); border-radius: 6px; padding: 14px 16px; color: var(--ink); font-weight: 750; font-size: 15px; line-height: 1.5; }
.post-nav a:hover { border-color: var(--line-strong); text-decoration: none; color: var(--brand); }
.post-nav small { display: block; color: var(--muted); font-weight: 400; font-size: 12px; margin-bottom: 4px; }
.post-nav .next { text-align: right; }

/* ---- 頁尾 ---- */
.site-footer { background: var(--night); color: #dfe8f3; margin-top: 0; padding: 40px 0 28px; font-size: 14px; }
.site-footer a { color: #fff; }
.footer-grid { display: grid; grid-template-columns: 1.4fr 1fr 1fr 1fr; gap: 28px; }
.site-footer h2 { color: #fff; font-size: 15px; margin-bottom: 10px; letter-spacing: 0; }
.site-footer ul { list-style: none; padding: 0; margin: 0; display: grid; gap: 4px; }
.site-footer ul a { display: inline-flex; min-height: 32px; align-items: center; }
.site-footer .legal { border-top: 1px solid #2a4263; margin-top: 28px; padding-top: 16px; font-size: 13px; color: #c4d2e3; }

/* ---- LINE 浮動按鈕 ---- */
.line-float { position: fixed; right: 18px; bottom: 18px; z-index: 30; display: inline-flex; align-items: center; gap: 8px; background: var(--line-green); color: #fff; border-radius: 999px; padding: 9px 18px 9px 10px; font-size: 14px; font-weight: 750; box-shadow: var(--overlay); }
.line-float:hover { text-decoration: none; background: #066a33; }
.line-float .badge { background: #fff; color: var(--line-green); border-radius: 999px; padding: 2px 7px; font-size: 12px; font-weight: 800; }
.line-float .qr { position: absolute; right: 0; bottom: calc(100% + 10px); width: 132px; padding: 10px; background: #fff; border-radius: 6px; box-shadow: var(--overlay); opacity: 0; pointer-events: none; transition: opacity .15s; }
.line-float:hover .qr, .line-float:focus-visible .qr { opacity: 1; }

@media (max-width: 1099px) {
  .grid, .group-grid { grid-template-columns: repeat(2, minmax(0, 1fr)); }
  .lead { grid-template-columns: 1fr; }
  .footer-grid { grid-template-columns: 1fr 1fr; }
  .main-nav { gap: 14px; }
  .main-nav a:nth-child(n+4) { display: none; }
}
@media (max-width: 760px) {
  .utility .tagline { display: none; }
  .site-header .wrap { gap: 10px; min-height: 58px; }
  .brand span { display: none; }
  .main-nav { display: none; position: absolute; left: 0; right: 0; top: 100%; background: var(--paper); border-bottom: 1px solid var(--line); flex-direction: column; gap: 0; padding: 6px 16px 12px; }
  .main-nav.open { display: flex; }
  .main-nav a, .main-nav a:nth-child(n+4) { display: block; padding: 12px 0; border-bottom: 1px solid var(--line); }
  .menu-toggle { display: inline-grid; }
  .header-actions { margin-left: auto; }
  .header-actions .button.line { display: none; }
  .grid, .group-grid { grid-template-columns: 1fr; }
  .row { grid-template-columns: 108px 1fr; }
  .hero { padding: 30px 0 26px; }
  .section { padding: 36px 0; }
  .article-body { font-size: 16px; }
  .cta { grid-template-columns: 1fr; }
  .post-nav { grid-template-columns: 1fr; }
  .post-nav .next { text-align: left; }
  .footer-grid { grid-template-columns: 1fr; }
  .line-float { width: 56px; height: 56px; padding: 0; justify-content: center; }
  .line-float .text, .line-float .qr { display: none; }
  .line-float .badge { font-size: 13px; }
}
@media (prefers-reduced-motion: reduce) { html { scroll-behavior: auto; } * { transition: none !important; } }