/* =============================================
   Ballard船闸故事文章 - 样式表
   ============================================= */

/* 基础重置 */
*, *::before, *::after {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}

/* 根变量 */
:root {
  --color-primary: #1a4a6b;
  --color-accent: #2e7fb8;
  --color-text: #2c2c2c;
  --color-text-light: #555;
  --color-bg: #fafaf8;
  --color-bg-card: #ffffff;
  --color-border: #dde3e8;
  --color-quote-bg: #eef5fb;
  --font-serif: 'Georgia', 'Times New Roman', serif;
  --font-sans: 'Helvetica Neue', Arial, 'PingFang SC', 'Microsoft YaHei', sans-serif;
  --max-width: 720px;
  --line-height: 1.85;
}

/* 全局 */
html {
  font-size: 17px;
  scroll-behavior: smooth;
}

body {
  font-family: var(--font-serif);
  background-color: var(--color-bg);
  color: var(--color-text);
  line-height: var(--line-height);
  font-size: 17px;
}

/* 与站内专题文章一致的悬浮导航 */
.article-site-nav {
  position: fixed;
  top: 20px;
  left: 20px;
  z-index: 100;
  display: flex;
  align-items: center;
  gap: 10px;
  font-family: var(--font-sans);
}

.article-site-brand {
  width: 40px;
  height: 40px;
  display: grid;
  place-items: center;
  border-radius: 50%;
  background: #087f5b;
  color: #fff;
  text-decoration: none;
  box-shadow: 0 8px 25px rgba(0, 0, 0, 0.28);
}

.article-site-links {
  display: flex;
  padding: 2px 6px;
  border: 1px solid rgba(255, 255, 255, 0.3);
  border-radius: 999px;
  background: rgba(9, 31, 47, 0.88);
  backdrop-filter: blur(8px);
}

.article-site-links a {
  padding: 6px 9px;
  color: #c7d9e6;
  font-size: 12px;
  text-decoration: none;
}

.article-site-links a:hover { color: #fff; }

.lang-switch {
  position: fixed;
  top: 20px;
  right: 20px;
  z-index: 100;
}

.lang-switch a {
  display: inline-block;
  padding: 7px 14px;
  border: 1px solid rgba(255, 255, 255, 0.35);
  border-radius: 4px;
  background: rgba(9, 31, 47, 0.88);
  color: #d7e6f0;
  font-family: var(--font-sans);
  font-size: 12px;
  text-decoration: none;
  backdrop-filter: blur(8px);
  transition: all 0.2s;
}

.lang-switch a:hover {
  border-color: #fff;
  color: #fff;
}

/* 主容器 */
.container {
  max-width: 860px;
  margin: 0 auto;
  padding: 0 24px;
}

/* 与其他专题文章一致的全宽首屏 */
.hero {
  position: relative;
  min-height: 560px;
  padding: 126px 24px 78px;
  display: flex;
  align-items: center;
  justify-content: center;
  overflow: hidden;
  text-align: center;
}

.hero-bg {
  position: absolute;
  inset: 0;
  background: url('images/image-01.jpg') center / cover no-repeat;
}

.hero-overlay {
  position: absolute;
  inset: 0;
  background: linear-gradient(180deg, rgba(5, 22, 34, 0.42), rgba(5, 22, 34, 0.82));
}

.hero-content {
  position: relative;
  z-index: 1;
  width: min(820px, 100%);
}

.article-category {
  display: inline-block;
  background-color: var(--color-accent);
  color: #fff;
  font-size: 0.72rem;
  font-weight: 700;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  padding: 0.25rem 0.75rem;
  border-radius: 2px;
  margin-bottom: 1.25rem;
}

.article-title {
  font-family: var(--font-serif);
  font-size: clamp(2.35rem, 5vw, 4rem);
  font-weight: 700;
  line-height: 1.3;
  color: #fff;
  margin-bottom: 1rem;
  text-shadow: 0 2px 18px rgba(0, 0, 0, 0.45);
}

.article-subtitle {
  max-width: 700px;
  margin: 0 auto 1.5rem;
  font-size: clamp(1rem, 2vw, 1.15rem);
  color: rgba(255, 255, 255, 0.84);
  line-height: 1.6;
}

.article-meta {
  font-family: var(--font-sans);
  font-size: 0.82rem;
  color: rgba(255, 255, 255, 0.68);
  display: flex;
  justify-content: center;
  gap: 1.5rem;
  flex-wrap: wrap;
}

.article-meta span::before {
  margin-right: 0.3rem;
}

/* 正文 */
.article-body {
  margin-bottom: 0;
}

.section { padding: 72px 0; }
.section + .section { border-top: 1px solid var(--color-border); }

.article-body p {
  margin-bottom: 1.4em;
  font-size: 1.03rem;
  line-height: var(--line-height);
}

.article-body h2 {
  font-family: var(--font-serif);
  font-size: clamp(1.5rem, 3.5vw, 2.1rem);
  color: var(--color-primary);
  margin: 0 0 1.75rem;
  line-height: 1.3;
}

.article-body h3 {
  font-size: 1.15rem;
  font-weight: 700;
  color: var(--color-primary);
  margin: 2rem 0 0.75rem;
}

/* 行内图片 */
.article-body figure {
  margin: 2.25rem 0;
}

.article-body figure img {
  width: 100%;
  height: auto;
  display: block;
  border-radius: 12px;
  box-shadow: 0 4px 24px rgba(0, 0, 0, 0.1);
}

.article-body figcaption {
  font-size: 0.78rem;
  color: #888;
  text-align: center;
  margin-top: 0.75rem;
  font-style: italic;
  line-height: 1.5;
}

/* 引用块 */
blockquote {
  background-color: var(--color-quote-bg);
  border-left: 5px solid var(--color-accent);
  padding: 1.4rem 1.6rem;
  margin: 2.25rem 0;
  border-radius: 0 12px 12px 0;
}

blockquote p {
  margin-bottom: 0 !important;
  font-style: italic;
  color: var(--color-text-light);
}

/* 信息框 */
.info-box {
  background-color: #f0f7ff;
  border: 1px solid #b8d9f5;
  border-radius: 12px;
  padding: 1.5rem 1.75rem;
  margin: 2.25rem 0;
}

.info-box h4 {
  font-size: 0.9rem;
  font-weight: 700;
  color: var(--color-primary);
  margin-bottom: 0.6rem;
  text-transform: uppercase;
  letter-spacing: 0.05em;
}

.info-box ul {
  padding-left: 1.2rem;
  font-size: 0.92rem;
  color: var(--color-text-light);
}

.info-box ul li {
  margin-bottom: 0.35rem;
}

/* 外链 */
.article-body a {
  color: var(--color-accent);
  text-decoration: underline;
  text-underline-offset: 2px;
}

.article-body a:hover {
  color: var(--color-primary);
}

/* 文章尾部 */
.article-footer {
  padding: 56px max(24px, calc((100vw - 812px) / 2));
  background: #17384f;
  font-family: var(--font-sans);
  font-size: 0.82rem;
  color: #c2d2dd;
}

.article-footer h4 {
  max-width: 812px;
  margin-left: auto;
  margin-right: auto;
  font-size: 0.8rem;
  font-weight: 700;
  color: #8fc6e8;
  margin-bottom: 1rem;
  letter-spacing: 0.14em;
  text-transform: uppercase;
}

.article-footer ol {
  max-width: 812px;
  margin-left: auto;
  margin-right: auto;
  padding-left: 1.2rem;
}

.article-footer ol li {
  margin-bottom: 0.55rem;
}

.article-footer a {
  color: #b7ddf3;
}

/* 页脚 */
.site-footer {
  background-color: #102636;
  color: #7895a8;
  text-align: center;
  padding: 1.5rem;
  font-size: 0.8rem;
  margin-top: 0;
}

/* 响应式 */
@media (max-width: 600px) {
  html { font-size: 15px; }
  .hero { min-height: 0; padding: 108px 20px 64px; }
  .article-title { font-size: 2rem; }
  .article-meta { gap: 0.6rem 1rem; }
  .article-site-links { display: none; }
  .section { padding: 48px 0; }
}