@import url('https://fonts.googleapis.com/css2?family=Oswald:wght@400;500;600;700&family=Noto+Sans+TC:wght@300;400;500;700&display=swap');

:root {
  --bg-primary:      #0f1a0f;
  --bg-secondary:    #131e13;
  --bg-card:         #1a271a;
  --bg-card-hover:   #1f2f1f;
  --accent-green:    #4a7c42;
  --accent-brass:    #b8860b;
  --accent-brass-lt: #d4a520;
  --text-primary:    #d4d8d0;
  --text-secondary:  #9aa095;
  --text-heading:    #e8ebe4;
  --text-link:       #7ab872;
  --border:          #2a3d2a;
  --max-content:     800px;
  --max-site:        1200px;
  --radius:          4px;
  --ease:            0.2s ease;
}

/* ── Reset ── */
*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }
img   { max-width: 100%; height: auto; display: block; }
a     { color: var(--text-link); text-decoration: none; }
a:hover { text-decoration: underline; }

/* ── Base ── */
html { font-size: 16px; scroll-behavior: smooth; }
body {
  font-family: 'Noto Sans TC', 'PingFang TC', system-ui, sans-serif;
  background: var(--bg-primary);
  color: var(--text-primary);
  line-height: 1.75;
  min-height: 100vh;
  display: flex;
  flex-direction: column;
  word-break: break-word;
  overflow-x: hidden;
}

/* ── Site Header ── */
.site-header {
  background: var(--bg-secondary);
  border-bottom: 2px solid var(--accent-brass);
  padding: 0.75rem 1rem;
  position: sticky;
  top: 0;
  z-index: 100;
}
.site-header-inner {
  max-width: var(--max-site);
  margin: 0 auto;
  display: flex;
  align-items: baseline;
  justify-content: space-between;
  gap: 1rem;
  flex-wrap: wrap;
}
.site-logo {
  font-family: 'Oswald', sans-serif;
  font-size: 1.4rem;
  font-weight: 700;
  color: var(--accent-brass-lt);
  letter-spacing: 0.06em;
  text-transform: uppercase;
}
.site-logo:hover { text-decoration: none; opacity: 0.9; }
.site-tagline {
  font-size: 0.72rem;
  color: var(--text-secondary);
  letter-spacing: 0.12em;
  text-transform: uppercase;
  white-space: nowrap;
}

/* ── Root hero banner ── */
.site-hero {
  position: relative;
  min-height: 480px;
  background-image: url('https://upload.wikimedia.org/wikipedia/commons/e/e6/ROCS_Hai_Kun_%28SS-711%29_conduct_shallow_water_submersible_test.jpg');
  background-size: cover;
  background-position: center 45%;
  display: flex;
  align-items: flex-end;
  border-bottom: 2px solid var(--accent-brass);
  overflow: hidden;
}
.site-hero::before {
  content: '';
  position: absolute;
  inset: 0;
  background: linear-gradient(
    to bottom,
    rgba(10,26,10,0.25) 0%,
    rgba(10,26,10,0.45) 45%,
    rgba(10,26,10,0.88) 80%,
    rgba(10,26,10,0.97) 100%
  );
  z-index: 1;
}
.site-hero-content {
  position: relative;
  z-index: 2;
  width: 100%;
  max-width: var(--max-site);
  margin: 0 auto;
  padding: 0 1.5rem 2.5rem;
}
.site-hero h1 {
  font-family: 'Oswald', sans-serif;
  font-size: clamp(2.2rem, 6vw, 4rem);
  font-weight: 700;
  color: var(--text-heading);
  text-transform: uppercase;
  letter-spacing: 0.08em;
  margin-bottom: 0.45rem;
  text-shadow: 0 2px 16px rgba(0,0,0,0.7);
}
.site-hero h1 span { color: var(--accent-brass-lt); }
.site-hero p {
  color: rgba(212,216,208,0.85);
  font-size: 0.95rem;
  letter-spacing: 0.08em;
  margin-bottom: 0.6rem;
}
.site-hero-attribution {
  font-size: 0.67rem;
  color: rgba(148,160,149,0.6);
  letter-spacing: 0.03em;
  margin-top: 0.9rem;
}
.site-hero-attribution a {
  color: rgba(184,134,11,0.7);
  text-decoration: none;
}
.site-hero-attribution a:hover { color: var(--accent-brass-lt); }

/* ── Stats bar ── */
.stats-bar {
  background: var(--bg-secondary);
  border-bottom: 1px solid var(--border);
  padding: 0.45rem 1rem;
  text-align: center;
  font-size: 0.82rem;
  color: var(--text-secondary);
}
.stats-bar .view-count { color: var(--accent-brass-lt); font-weight: 600; }

/* ── Articles section ── */
.articles-section {
  max-width: var(--max-site);
  margin: 0 auto;
  padding: 2rem 1rem 3rem;
}
.section-heading {
  font-family: 'Oswald', sans-serif;
  font-size: 1.1rem;
  color: var(--text-secondary);
  text-transform: uppercase;
  letter-spacing: 0.18em;
  border-left: 3px solid var(--accent-brass);
  padding-left: 0.75rem;
  margin-bottom: 1.5rem;
}

/* ── Cards grid ── */
.articles-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 1.5rem;
}
@media (max-width: 900px) { .articles-grid { grid-template-columns: repeat(2, 1fr); } }
@media (max-width: 580px) { .articles-grid { grid-template-columns: 1fr; } }

.card {
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  overflow: hidden;
  transition: border-color var(--ease), transform var(--ease), box-shadow var(--ease);
}
.card:hover {
  border-color: var(--accent-brass);
  transform: translateY(-3px);
  box-shadow: 0 6px 24px rgba(0,0,0,0.4);
}
.card-link { display: block; color: inherit; }
.card-link:hover { text-decoration: none; }
.card-body { padding: 1.25rem; }

/* ── Card thumbnail image ── */
.card-img {
  width: 100%;
  aspect-ratio: 16 / 9;
  object-fit: cover;
  object-position: center;
  display: block;
  border-bottom: 1px solid var(--border);
  background: #0a140a;
  transition: opacity 0.3s ease, transform 0.35s ease;
}
.card:hover .card-img {
  opacity: 0.88;
  transform: scale(1.03);
}

.card-title {
  font-family: 'Oswald', sans-serif;
  font-size: 1.15rem;
  font-weight: 600;
  color: var(--text-heading);
  margin-bottom: 0.5rem;
  line-height: 1.4;
}
.card-desc {
  font-size: 0.875rem;
  color: var(--text-secondary);
  margin-bottom: 1rem;
  display: -webkit-box;
  -webkit-line-clamp: 3;
  -webkit-box-orient: vertical;
  overflow: hidden;
}
.card-meta {
  display: flex;
  align-items: center;
  justify-content: space-between;
  font-size: 0.78rem;
  color: var(--text-secondary);
  flex-wrap: wrap;
  gap: 0.4rem;
}
.card-date { color: var(--text-secondary); }
.card-views { color: var(--accent-green); }
.card-tags {
  display: flex;
  flex-wrap: wrap;
  gap: 0.35rem;
  margin-top: 0.75rem;
}
.tag {
  font-size: 0.7rem;
  background: rgba(74,124,66,0.15);
  color: var(--accent-green);
  border: 1px solid rgba(74,124,66,0.25);
  padding: 0.1rem 0.45rem;
  border-radius: 2px;
  white-space: nowrap;
}

/* ── Article page layout ── */
.article-container {
  max-width: var(--max-content);
  margin: 2rem auto;
  padding: 0 1rem;
  width: 100%;
}

.back-link {
  display: inline-flex;
  align-items: center;
  gap: 0.35rem;
  color: var(--text-secondary);
  font-size: 0.875rem;
  margin-bottom: 1.5rem;
  padding: 0.35rem 0;
  transition: color var(--ease);
}
.back-link:hover { color: var(--text-primary); text-decoration: none; }

/* ── Hero image ── */
.hero-wrapper {
  width: 100%;
  margin-bottom: 1.75rem;
  border-radius: var(--radius);
  overflow: hidden;
  background: #0a140a;
}
.hero-image {
  width: 100%;
  height: auto;
  display: block;
  object-fit: cover;
}

/* ── Article meta block ── */
.article-meta {
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-left: 4px solid var(--accent-brass);
  border-radius: var(--radius);
  padding: 1rem 1.25rem;
  margin-bottom: 2rem;
  display: flex;
  flex-wrap: wrap;
  gap: 1.25rem;
}
.meta-item { display: flex; flex-direction: column; gap: 0.2rem; min-width: 8rem; }
.meta-label {
  font-size: 0.68rem;
  text-transform: uppercase;
  letter-spacing: 0.12em;
  color: var(--text-secondary);
}
.meta-value { color: var(--text-heading); font-weight: 500; font-size: 0.9rem; }
.meta-author-name { color: var(--accent-brass-lt); }

/* ── Article content ── */
.article-content h1 {
  font-family: 'Oswald', sans-serif;
  font-size: clamp(1.6rem, 4.5vw, 2.4rem);
  font-weight: 700;
  color: var(--text-heading);
  line-height: 1.3;
  margin-bottom: 1.75rem;
}
.article-content h2 {
  font-family: 'Oswald', sans-serif;
  font-size: 1.4rem;
  font-weight: 600;
  color: var(--accent-brass-lt);
  margin: 2.25rem 0 0.9rem;
  padding-bottom: 0.3rem;
  border-bottom: 1px solid var(--border);
}
.article-content h3 {
  font-size: 1.1rem;
  font-weight: 700;
  color: var(--text-heading);
  margin: 1.5rem 0 0.6rem;
}
.article-content p  { margin-bottom: 1.2rem; }
.article-content ul,
.article-content ol { padding-left: 1.6rem; margin-bottom: 1.2rem; }
.article-content li { margin-bottom: 0.45rem; }
.article-content blockquote {
  border-left: 4px solid var(--accent-brass);
  padding: 0.75rem 1.1rem;
  background: var(--bg-card);
  margin: 1.5rem 0;
  color: var(--text-secondary);
  font-style: italic;
  border-radius: 0 var(--radius) var(--radius) 0;
}
.article-content strong { color: var(--text-heading); }
.article-content em    { color: var(--accent-brass-lt); font-style: normal; }

/* ── Data Tables ── */
.data-table {
  width: 100%;
  border-collapse: collapse;
  margin: 1.5rem 0;
  font-size: 0.88rem;
  line-height: 1.5;
}
.data-table th {
  background: rgba(184,134,11,0.12);
  color: var(--accent-brass-lt);
  font-family: 'Oswald', sans-serif;
  font-weight: 600;
  letter-spacing: 0.03em;
  text-align: left;
  padding: 0.6rem 0.85rem;
  border-bottom: 2px solid var(--accent-brass);
}
.data-table td {
  padding: 0.55rem 0.85rem;
  border-bottom: 1px solid var(--border);
  color: var(--text-primary);
  vertical-align: top;
}
.data-table tr:nth-child(even) td {
  background: rgba(255,255,255,0.02);
}
.data-table tr:hover td {
  background: rgba(184,134,11,0.05);
}
@media (max-width: 600px) {
  .data-table { font-size: 0.8rem; }
  .data-table th, .data-table td { padding: 0.45rem 0.6rem; }
}

/* ── Footer ── */
.site-footer {
  background: var(--bg-secondary);
  border-top: 2px solid var(--border);
  padding: 2rem 1rem;
  font-size: 0.82rem;
  color: var(--text-secondary);
  margin-top: auto;
}
.footer-inner {
  max-width: var(--max-site);
  margin: 0 auto;
  display: flex;
  flex-direction: column;
  gap: 0.85rem;
}
.footer-attribution {
  padding: 0.85rem 1rem;
  background: rgba(184,134,11,0.06);
  border: 1px solid rgba(184,134,11,0.2);
  border-radius: var(--radius);
  line-height: 1.6;
  color: var(--text-secondary);
}
.footer-attribution a { color: var(--accent-brass-lt); }
.footer-attribution a:hover { text-decoration: underline; }
.footer-bottom { color: var(--text-secondary); }

/* ── Responsive tweaks ── */
@media (max-width: 600px) {
  .site-hero  { min-height: 300px; }
  .site-hero-content { padding: 0 1rem 2rem; }
  .site-tagline { display: none; }
  .article-meta { flex-direction: column; gap: 0.8rem; }
  .articles-section { padding: 1.25rem 0.75rem 2rem; }
}