/* =========================================================================
   青翎引路 · 人淀共生 —— 文章页样式

   这一份只服务 articles/ 里的文章页，和网站主样式（styles.css）互不影响。
   文章页只需要引入这一份，就能独立打开。

   视觉沿用主站：深蓝 #16233f + 米白 #f5f6f4、衬线标题 + 黑体正文、
   图片 12px 圆角。已适配电脑、平板、手机。
   ========================================================================= */

:root {
  --navy: #16233f;
  --navy-2: #2a3550;
  --navy-3: #3a4660;
  --mist: #8f98a8;

  --paper: #f5f6f4;
  --white: #ffffff;

  --rule: rgba(22, 35, 63, 0.14);
  --rule-strong: rgba(22, 35, 63, 0.32);

  --r: 12px;
  --r-pill: 999px;

  /* 正文栏宽度：中文单栏阅读的舒适区间 */
  --measure: 720px;
  --bar: 64px;

  --serif: "Source Han Serif SC", "Noto Serif SC", "Songti SC", "STSong",
    "SimSun", "Times New Roman", serif;
  --sans: "PingFang SC", "HarmonyOS Sans SC", "Source Han Sans SC",
    "Noto Sans SC", "Microsoft YaHei", system-ui, -apple-system, sans-serif;
}

*,
*::before,
*::after { box-sizing: border-box; }

html { -webkit-text-size-adjust: 100%; }

body {
  margin: 0;
  background: var(--paper);
  font-family: var(--sans);
  font-size: 17px;
  line-height: 1.9;
  color: var(--navy);
  -webkit-font-smoothing: antialiased;
  text-rendering: optimizeLegibility;
}

img { display: block; max-width: 100%; height: auto; }

::selection { background: rgba(22, 35, 63, 0.14); }

:focus-visible {
  outline: 2px solid var(--navy);
  outline-offset: 3px;
  border-radius: 4px;
}

/* ============================================================ 顶栏 */

.art-bar {
  position: sticky;
  top: 0;
  z-index: 20;
  background: rgba(245, 246, 244, 0.9);
  border-bottom: 1px solid var(--rule);
  backdrop-filter: blur(16px) saturate(160%);
  -webkit-backdrop-filter: blur(16px) saturate(160%);
}

.art-bar__inner {
  max-width: calc(var(--measure) + 2 * clamp(20px, 6vw, 56px));
  margin: 0 auto;
  padding: 0 clamp(20px, 6vw, 56px);
  height: var(--bar);
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 16px;
}

.art-back {
  display: inline-flex;
  align-items: center;
  gap: 7px;
  font-size: 13.5px;
  letter-spacing: 0.04em;
  color: var(--navy-2);
  text-decoration: none;
  transition: color 0.25s ease, transform 0.25s ease;
}

.art-back:hover { color: var(--navy); transform: translateX(-2px); }

.art-brand {
  font-size: 13px;
  font-weight: 600;
  letter-spacing: 0.28em;
  color: var(--navy);
  text-decoration: none;
}

/* ============================================================ 正文栏 */

.art {
  max-width: calc(var(--measure) + 2 * clamp(20px, 6vw, 56px));
  margin: 0 auto;
  padding: clamp(34px, 6vw, 76px) clamp(20px, 6vw, 56px) clamp(56px, 8vw, 96px);
}

.art__eyebrow {
  margin: 0 0 20px;
  font-size: 12.5px;
  font-weight: 500;
  letter-spacing: 0.3em;
  text-indent: 0.3em;
  color: var(--mist);
}

.art__title {
  margin: 0 0 22px;
  font-family: var(--serif);
  font-size: clamp(1.75rem, 4.4vw, 2.9rem);
  font-weight: 500;
  line-height: 1.28;
  letter-spacing: 0.01em;
}

.art__lead {
  margin: 0 0 26px;
  padding-left: 18px;
  border-left: 2px solid var(--rule-strong);
  font-size: clamp(1rem, 2.2vw, 1.12rem);
  line-height: 1.85;
  color: var(--navy-2);
}

.art__meta {
  display: flex;
  flex-wrap: wrap;
  gap: 8px 20px;
  margin: 0 0 clamp(28px, 4vw, 44px);
  padding-bottom: 20px;
  border-bottom: 1px solid var(--rule);
  font-size: 13px;
  letter-spacing: 0.08em;
  color: var(--mist);
}

/* 正文排版 */

.art__body > p { margin: 0 0 1.5em; }

.art__body h2 {
  margin: 2.2em 0 0.8em;
  font-family: var(--serif);
  font-size: clamp(1.25rem, 2.8vw, 1.55rem);
  font-weight: 500;
  line-height: 1.45;
}

.art__body h3 {
  margin: 1.9em 0 0.7em;
  font-size: clamp(1.05rem, 2.2vw, 1.18rem);
  font-weight: 600;
  line-height: 1.5;
}

.art__body ul,
.art__body ol {
  margin: 0 0 1.5em;
  padding-left: 1.35em;
}

.art__body li { margin: 0.35em 0; }

.art__body a {
  color: var(--navy);
  text-decoration: underline;
  text-underline-offset: 3px;
  text-decoration-thickness: 1px;
  text-decoration-color: var(--rule-strong);
}

.art__body a:hover { text-decoration-color: var(--navy); }

.art__body strong { font-weight: 600; }

.art__body blockquote {
  margin: 1.9em 0;
  padding: 4px 0 4px 20px;
  border-left: 2px solid var(--navy);
  font-family: var(--serif);
  font-size: clamp(1.05rem, 2.4vw, 1.2rem);
  line-height: 1.8;
  color: var(--navy-2);
}

.art__body blockquote p:last-child { margin-bottom: 0; }

/* 访谈问答：问题整行加粗，回答缩进并带一道细线，好区分谁在说话 */
.qa {
  display: grid;
  gap: 15px;
  margin: 1.9em 0;
}

.qa .qa__q {
  margin: 0;
  font-weight: 600;
  color: var(--navy);
}

.qa .qa__a {
  margin: 0 0 0 4px;
  padding-left: 17px;
  border-left: 2px solid var(--rule);
  color: var(--navy-2);
}

.qa .qa__a:last-child { margin-bottom: 0; }

.qa .qa__a strong { font-weight: 600; color: var(--navy); }

/* ============================================================ 图片与图注 */

figure { margin: 0; }

.art__cover { margin: 0 0 clamp(30px, 5vw, 50px); }

.art__body figure { margin: 2.2em 0; }

figure img {
  width: 100%;
  border-radius: var(--r);
  background: rgba(22, 35, 63, 0.04);
}

figcaption {
  margin-top: 10px;
  font-size: 12.5px;
  line-height: 1.7;
  letter-spacing: 0.04em;
  color: var(--mist);
}

/* ============================================================ 表格 */
/* 手机上把 table 包进 <div class="table-scroll"> 就能横向滑动，不会撑破页面 */

.table-scroll {
  margin: 2em 0;
  overflow-x: auto;
  -webkit-overflow-scrolling: touch;
}

.table-scroll table { margin: 0; }

.art__body table {
  width: 100%;
  border-collapse: collapse;
  font-size: 14.5px;
}

.art__body th,
.art__body td {
  padding: 11px 12px;
  border-bottom: 1px solid var(--rule);
  text-align: left;
  vertical-align: top;
}

.art__body th {
  font-weight: 600;
  border-bottom-color: var(--rule-strong);
}

.art__body hr {
  margin: 2.6em auto;
  width: 56px;
  border: 0;
  border-top: 1px solid var(--rule-strong);
}

/* ============================================================ 页脚 */

.art-foot {
  border-top: 1px solid var(--rule);
  padding: 26px 0 44px;
}

.art-foot__inner {
  max-width: calc(var(--measure) + 2 * clamp(20px, 6vw, 56px));
  margin: 0 auto;
  padding: 0 clamp(20px, 6vw, 56px);
  display: flex;
  justify-content: space-between;
  align-items: center;
  gap: 14px;
  flex-wrap: wrap;
}

.art-foot p {
  margin: 0;
  font-size: 12.5px;
  letter-spacing: 0.1em;
  color: var(--mist);
}

.art-foot a {
  font-size: 12.5px;
  letter-spacing: 0.1em;
  color: var(--navy-2);
  text-decoration: none;
}

.art-foot a:hover {
  color: var(--navy);
  text-decoration: underline;
  text-underline-offset: 3px;
}

/* ============================================================ 响应式 */

@media (max-width: 760px) {
  :root { --bar: 58px; }

  body { font-size: 16.5px; line-height: 1.88; }

  .art { padding-top: 28px; }

  .art__lead { padding-left: 14px; }

  .art__meta { gap: 6px 16px; }
}

/* ============================================================ 偏好设置 */

@media (prefers-reduced-motion: reduce) {
  *,
  *::before,
  *::after {
    transition-duration: 0.001ms !important;
    animation-duration: 0.001ms !important;
  }
}