@charset "UTF-8";

:root {
  --ink: #071b2c;
  --text: #14202b;
  --muted: #5d7183;
  --accent: #186f78;
  --rule: rgba(7, 27, 44, 0.13);
  --font: "PingFang SC", "Hiragino Sans GB", "Noto Sans SC", "Microsoft YaHei", system-ui, sans-serif;
}

*, *::before, *::after { box-sizing: border-box; }
html { color-scheme: light; }
body {
  margin: 0;
  min-height: 100vh;
  background:
    linear-gradient(180deg, rgba(7, 27, 44, 0.46), rgba(7, 27, 44, 0.78)),
    url("../images/charles-scroll-background.jpg") center / cover fixed;
  color: var(--text);
  font-family: var(--font);
  -webkit-font-smoothing: antialiased;
}
a { color: inherit; text-decoration: none; }
button { font-family: inherit; }
:focus-visible { outline: 2px solid #42a5a3; outline-offset: 3px; }

.articles-topbar {
  position: sticky;
  top: 0;
  z-index: 10;
  border-bottom: 1px solid rgba(255, 255, 255, 0.42);
  background: rgba(247, 250, 252, 0.90);
  backdrop-filter: blur(16px) saturate(150%);
}
.topbar-inner {
  width: min(1100px, calc(100% - 40px));
  height: 64px;
  margin: auto;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 24px;
}
.articles-brand {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  padding: 6px 9px;
  border-radius: 999px;
  font-weight: 700;
  transition: background-color 180ms ease;
}
.articles-brand:hover { background: rgba(7, 27, 44, 0.05); }
.articles-brand img { width: 30px; height: 30px; border-radius: 7px; }
.articles-topbar nav { display: flex; gap: 8px; color: var(--muted); font-size: 14px; }
.articles-topbar nav a {
  padding: 8px 16px;
  border-radius: 999px;
  transition: color 180ms ease, background-color 180ms ease;
}
.articles-topbar nav a:hover { color: var(--text); background: rgba(7, 27, 44, 0.05); }
.articles-topbar nav .is-current { color: var(--accent); background: rgba(7, 27, 44, 0.08); font-weight: 600; }

.articles-main {
  width: min(960px, calc(100% - 40px));
  margin: clamp(42px, 7vw, 80px) auto;
  padding: clamp(28px, 5vw, 54px);
  border: 1px solid rgba(255, 255, 255, 0.45);
  border-radius: 18px;
  background: rgba(247, 250, 252, 0.88);
  box-shadow: 0 26px 80px rgba(3, 18, 31, 0.30);
  backdrop-filter: blur(20px) saturate(140%);
}
.articles-intro { max-width: 700px; }
.eyebrow { margin: 0 0 10px; color: var(--accent); font-size: 13px; font-weight: 700; letter-spacing: 0.08em; }
h1 { margin: 0; font-size: clamp(34px, 6vw, 58px); line-height: 1.05; letter-spacing: -0.045em; }
.articles-intro > p:last-child { margin: 20px 0 0; color: var(--muted); line-height: 1.75; }

.category-filter { display: flex; flex-wrap: wrap; gap: 10px; margin: 38px 0 30px; }
.filter-item {
  border: 0;
  border-radius: 999px;
  padding: 10px 17px;
  background: rgba(255, 255, 255, 0.72);
  color: var(--muted);
  font-size: 14px;
  font-weight: 650;
  cursor: pointer;
  transition: transform 180ms ease, background-color 180ms ease, color 180ms ease, box-shadow 180ms ease;
}
.filter-item span { margin-left: 5px; opacity: 0.62; font-size: 12px; }
.filter-item:hover { transform: translateY(-2px); color: var(--text); }
.filter-item.is-active { background: var(--ink); color: #fff; box-shadow: 0 9px 22px rgba(7, 27, 44, 0.22); }

.articles-grid { display: grid; grid-template-columns: repeat(2, minmax(0, 1fr)); gap: 18px; }
.article-card {
  display: flex;
  min-height: 260px;
  flex-direction: column;
  padding: 26px;
  border: 1px solid var(--rule);
  border-radius: 14px;
  background: rgba(255, 255, 255, 0.72);
  box-shadow: 0 12px 30px rgba(7, 27, 44, 0.07);
  transition: transform 200ms ease, border-color 200ms ease, box-shadow 200ms ease;
}
.article-card:hover {
  transform: translateY(-5px);
  border-color: rgba(24, 111, 120, 0.52);
  box-shadow: 0 20px 42px rgba(7, 27, 44, 0.16);
}
.article-card[hidden] { display: none; }
.article-category { align-self: flex-start; padding: 5px 10px; border-radius: 999px; background: rgba(24, 111, 120, 0.10); color: var(--accent); font-size: 12px; font-weight: 700; }
.article-card h2 { margin: 18px 0 10px; font-size: 24px; letter-spacing: -0.025em; }
.article-card p { margin: 0 0 24px; color: var(--muted); font-size: 14px; line-height: 1.7; }
/* 不用 space-between：浏览次数是 JS 后插进来的第三个元素，
   用 flex-start + time 的自动右边距，加不加都保持「日期靠左、Markdown 靠右」 */
.article-meta { display: flex; justify-content: flex-start; gap: 16px; margin-top: auto; padding-top: 15px; border-top: 1px solid var(--rule); color: var(--muted); font-size: 12px; }
.article-meta > time { margin-right: auto; }
/* 浏览次数：由 /views.js 异步填入，取不到就不显示 */
.article-views { white-space: nowrap; opacity: 0.9; }
.articles-empty { grid-column: 1 / -1; padding: 56px 20px; border: 1px dashed var(--rule); border-radius: 14px; color: var(--muted); text-align: center; }
.articles-empty[hidden] { display: none; }

footer { width: min(960px, calc(100% - 40px)); margin: 0 auto 36px; color: rgba(232, 238, 244, 0.72); font-size: 13px; text-align: center; }

@media (max-width: 700px) {
  .articles-grid { grid-template-columns: 1fr; }
  .articles-main { width: min(100% - 24px, 960px); padding: 24px 18px; margin-block: 24px; }
  .topbar-inner { width: calc(100% - 28px); }
  .article-card { min-height: 230px; padding: 22px; }
}

@media (prefers-reduced-motion: reduce) {
  .filter-item, .article-card { transition: none; }
}