:root {
  --navy: #1a3a5c;
  --navy-dark: #0f2440;
  --navy-hover: #274b6d;
  --accent: #1a5c8c;
  --bg: #ffffff;
  --divider: #eef1f4;
  --card: #f7f9fb;
  --text: #243040;
  --muted: #5c6773;
  --line: #d8dee6;
  --header-h: 64px;
  --radius: 6px;
  --shadow: 0 1px 2px rgba(15, 36, 64, 0.06);
}

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

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

body {
  margin: 0;
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", "Microsoft YaHei", "PingFang SC", sans-serif;
  font-size: 16px;
  line-height: 1.8;
  color: var(--text);
  background: var(--bg);
}

img {
  max-width: 100%;
  height: auto;
  border: 0;
  vertical-align: middle;
}

a {
  color: var(--accent);
  text-decoration: none;
}

a:hover {
  text-decoration: underline;
}

h1,
h2,
h3,
h4 {
  font-family: "Noto Serif SC", "Songti SC", "STSong", "SimSun", serif;
  color: var(--navy);
  line-height: 1.35;
  font-weight: 700;
  margin: 0 0 0.6em;
}

h1 { font-size: 1.85rem; }
h2 { font-size: 1.4rem; }
h3 { font-size: 1.15rem; }

p { margin: 0 0 1em; }

ul,
ol {
  margin: 0 0 1em;
  padding-left: 1.3em;
}

figure {
  margin: 0;
}

address {
  font-style: normal;
}

.skip-link {
  position: absolute;
  left: 12px;
  top: -48px;
  z-index: 200;
  background: #fff;
  color: var(--navy);
  padding: 8px 14px;
  border-radius: var(--radius);
}

.skip-link:focus {
  top: 12px;
}

.container {
  width: 100%;
  max-width: 1140px;
  margin: 0 auto;
  padding: 0 20px;
  min-width: 0;
}

.section {
  padding: 48px 0;
}

.section-alt {
  background: var(--card);
}

.section-title {
  margin-bottom: 8px;
}

.section-desc {
  color: var(--muted);
  margin-bottom: 28px;
}

.page-header {
  padding: 36px 0 8px;
}

.page-header h1 {
  margin-bottom: 8px;
}

.lede {
  color: var(--muted);
  font-size: 1.02rem;
  max-width: 40em;
}

/* Buttons */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-height: 44px;
  padding: 8px 20px;
  border-radius: var(--radius);
  border: 1px solid transparent;
  font-size: 0.95rem;
  font-weight: 600;
  letter-spacing: 0.02em;
  line-height: 1.2;
  text-decoration: none;
  cursor: pointer;
  transition: background 0.15s ease, color 0.15s ease, border-color 0.15s ease;
}

.btn:hover {
  text-decoration: none;
}

.btn-primary {
  background: var(--navy);
  color: #fff;
}

.btn-primary:hover {
  background: var(--navy-hover);
  color: #fff;
}

.btn-outline {
  background: transparent;
  color: var(--navy);
  border-color: var(--navy);
}

.btn-outline:hover {
  background: var(--navy);
  color: #fff;
}

.tag {
  display: inline-block;
  padding: 2px 8px;
  border-radius: 999px;
  font-size: 0.75rem;
  font-weight: 600;
  letter-spacing: 0.04em;
  background: #e6eef5;
  color: var(--navy);
  vertical-align: middle;
}

.tag-muted {
  background: var(--divider);
  color: var(--muted);
}

.nowrap {
  white-space: nowrap;
}

/* Header / nav */
#site-header {
  min-height: var(--header-h);
  background: var(--navy);
}

.site-nav {
  position: sticky;
  top: 0;
  z-index: 100;
  background: var(--navy);
  color: #fff;
}

.nav-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  min-height: var(--header-h);
  gap: 12px;
}

.brand {
  display: flex;
  align-items: center;
  gap: 10px;
  color: #fff;
  text-decoration: none;
  font-weight: 600;
  letter-spacing: 0.02em;
  min-width: 0;
}

.brand:hover {
  color: #fff;
  text-decoration: none;
}

.brand img {
  width: 36px;
  height: 36px;
  border-radius: 50%;
  background: #fff;
  flex-shrink: 0;
}

.brand span {
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
}

.nav-toggle {
  display: none;
  width: 44px;
  height: 44px;
  padding: 0;
  border: 0;
  background: transparent;
  cursor: pointer;
  flex-direction: column;
  justify-content: center;
  align-items: center;
  gap: 5px;
}

.nav-toggle span {
  display: block;
  width: 20px;
  height: 2px;
  background: #fff;
  transition: transform 0.2s ease, opacity 0.2s ease;
}

.site-nav.is-open .nav-toggle span:nth-child(1) {
  transform: translateY(7px) rotate(45deg);
}

.site-nav.is-open .nav-toggle span:nth-child(2) {
  opacity: 0;
}

.site-nav.is-open .nav-toggle span:nth-child(3) {
  transform: translateY(-7px) rotate(-45deg);
}

.nav-links {
  display: flex;
  align-items: center;
  gap: 4px;
  list-style: none;
  margin: 0;
  padding: 0;
}

.nav-links a {
  display: block;
  color: rgba(255, 255, 255, 0.86);
  text-decoration: none;
  padding: 8px 12px;
  border-radius: 4px;
  font-size: 0.95rem;
}

.nav-links a:hover,
.nav-links a.active {
  color: #fff;
  background: rgba(255, 255, 255, 0.1);
  text-decoration: none;
}

.nav-links a.active {
  box-shadow: inset 0 -2px 0 #fff;
  border-radius: 0;
}

/* Footer */
#site-footer {
  background: var(--navy-dark);
}

.site-footer {
  background: var(--navy-dark);
  color: rgba(255, 255, 255, 0.82);
  padding: 40px 0 24px;
}

.footer-grid {
  display: grid;
  gap: 28px;
}

.site-footer h3 {
  color: #fff;
  font-size: 1rem;
  margin-bottom: 10px;
}

.site-footer p,
.site-footer li {
  font-size: 0.92rem;
  line-height: 1.7;
}

.site-footer a {
  color: rgba(255, 255, 255, 0.86);
}

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

.footer-links {
  list-style: none;
  margin: 0;
  padding: 0;
}

.footer-links li + li {
  margin-top: 4px;
}

.footer-copy {
  margin: 28px 0 0;
  padding-top: 16px;
  border-top: 1px solid rgba(255, 255, 255, 0.12);
  font-size: 0.82rem;
  color: rgba(255, 255, 255, 0.55);
}

/* Hero */
.hero {
  position: relative;
  color: #fff;
  text-align: center;
  padding: 72px 20px 76px;
  background: var(--navy-dark) url("../img/bg.jpg") center / cover no-repeat;
}

.hero::before {
  content: "";
  position: absolute;
  inset: 0;
  background: rgba(15, 36, 64, 0.74);
}

.hero-inner {
  position: relative;
  z-index: 1;
  max-width: 780px;
  margin: 0 auto;
}

.hero-kicker {
  margin: 0 0 12px;
  letter-spacing: 0.18em;
  font-size: 0.82rem;
  color: rgba(255, 255, 255, 0.78);
}

.hero h1 {
  color: #fff;
  font-size: clamp(1.7rem, 5vw, 2.55rem);
  margin-bottom: 12px;
}

.hero-slogan {
  margin: 0 0 14px;
  font-size: clamp(1.05rem, 3vw, 1.35rem);
  color: rgba(255, 255, 255, 0.95);
}

.hero-meta {
  margin: 0 0 28px;
  color: rgba(255, 255, 255, 0.8);
}

.hero-actions {
  display: flex;
  flex-wrap: wrap;
  justify-content: center;
  gap: 12px;
}

.hero .btn-primary {
  background: #fff;
  color: var(--navy);
}

.hero .btn-primary:hover {
  background: var(--divider);
  color: var(--navy);
}

.hero .btn-outline {
  border-color: rgba(255, 255, 255, 0.85);
  color: #fff;
}

.hero .btn-outline:hover {
  background: #fff;
  color: var(--navy);
}

/* Cards */
.card-list {
  display: grid;
  gap: 14px;
}

.card {
  display: block;
  background: var(--card);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  padding: 18px 20px;
  color: inherit;
  text-decoration: none;
  box-shadow: var(--shadow);
  transition: border-color 0.15s ease, box-shadow 0.15s ease;
}

a.card:hover {
  border-color: var(--navy);
  box-shadow: 0 4px 16px rgba(15, 36, 64, 0.08);
  text-decoration: none;
}

.card h2,
.card h3 {
  margin: 8px 0 6px;
  font-size: 1.15rem;
}

.card p {
  margin: 0;
  color: var(--muted);
  font-size: 0.95rem;
}

.card.is-placeholder {
  opacity: 0.78;
}

.card-meta {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  align-items: center;
}

/* Home blocks */
.about-grid,
.feature-grid,
.info-grid,
.topic-grid {
  display: grid;
  gap: 20px;
}

.about-grid {
  align-items: center;
}

.about-visual {
  text-align: center;
}

.about-visual img {
  width: min(100%, 360px);
}

.feature {
  background: var(--card);
  border: 1px solid var(--divider);
  border-radius: var(--radius);
  padding: 20px 18px;
}

.feature h3 {
  margin-bottom: 8px;
}

.feature p {
  margin: 0;
  color: var(--muted);
}

.info-card {
  background: var(--card);
  border: 1px solid var(--divider);
  border-radius: var(--radius);
  padding: 16px 16px 14px;
}

.info-card .label {
  display: block;
  font-size: 0.78rem;
  letter-spacing: 0.08em;
  color: var(--muted);
  margin-bottom: 6px;
}

.info-card strong {
  display: block;
  color: var(--navy);
  font-size: 1.02rem;
  line-height: 1.45;
}

.info-card a {
  font-weight: 600;
}

/* Notice body */
.notice-body {
  max-width: 760px;
  margin: 0 auto;
  padding-bottom: 24px;
}

.notice-kicker {
  color: var(--muted);
  font-size: 0.9rem;
  margin-bottom: 8px;
}

.notice-body h1 {
  font-size: clamp(1.5rem, 4vw, 2rem);
  margin-bottom: 20px;
}

.notice-body h2 {
  margin-top: 2em;
  padding-bottom: 8px;
  border-bottom: 2px solid var(--navy);
  display: inline-block;
  max-width: 100%;
}

.notice-body h3 {
  margin-top: 1.4em;
}

.notice-banner {
  display: block;
  width: min(240px, 56vw);
  margin: 8px auto 28px;
  background: #fff;
}

.org-list {
  list-style: none;
  padding: 0;
  margin: 0 0 1em;
}

.org-list li {
  padding: 6px 0;
  border-bottom: 1px solid var(--divider);
}

.org-list span {
  display: block;
  font-size: 0.8rem;
  color: var(--muted);
}

.topic-grid {
  list-style: none;
  padding: 0;
  margin: 16px 0 8px;
}

.topic-grid li {
  background: var(--card);
  border: 1px solid var(--divider);
  border-radius: var(--radius);
  padding: 12px 14px;
}

.topic-grid li strong {
  display: block;
  color: var(--navy);
}

.qr {
  text-align: center;
  margin: 20px 0 8px;
}

.qr img {
  width: 168px;
  height: 168px;
  background: #fff;
  padding: 8px;
  border: 1px solid var(--line);
  border-radius: var(--radius);
}

.qr figcaption {
  margin-top: 8px;
  color: var(--muted);
  font-size: 0.9rem;
}

.table-wrap {
  width: 100%;
  max-width: 100%;
  overflow-x: auto;
  -webkit-overflow-scrolling: touch;
  margin: 12px 0 8px;
  border: 1px solid var(--line);
  border-radius: var(--radius);
}

.notice-body table,
.agenda-table {
  width: 100%;
  border-collapse: collapse;
  font-size: 0.92rem;
}

@media (min-width: 640px) {
  .notice-body table,
  .agenda-table {
    min-width: 560px;
  }

  .agenda-table th:nth-child(1),
  .agenda-table td:nth-child(1),
  .agenda-table th:nth-child(2),
  .agenda-table td:nth-child(2) {
    white-space: nowrap;
  }
}

.notice-body th,
.notice-body td,
.agenda-table th,
.agenda-table td {
  padding: 10px 12px;
  text-align: left;
  border-bottom: 1px solid var(--divider);
  vertical-align: top;
}

.notice-body thead th,
.agenda-table thead th {
  background: var(--navy);
  color: #fff;
  font-weight: 600;
  white-space: nowrap;
}

.notice-body tbody tr:nth-child(even),
.agenda-table tbody tr:nth-child(even) {
  background: var(--card);
}

.notice-sign {
  margin-top: 36px;
  text-align: right;
  color: var(--muted);
}

/* Forum portal */
.forum-hero {
  padding-bottom: 12px;
}

.forum-layout {
  display: grid;
  gap: 28px;
}

.forum-main,
.forum-aside {
  min-width: 0;
}

.forum-aside .info-card + .info-card {
  margin-top: 12px;
}

.contact-list {
  list-style: none;
  padding: 0;
  margin: 0;
}

.contact-list li {
  padding: 14px 0;
  border-bottom: 1px solid var(--divider);
}

.contact-list .label {
  display: block;
  color: var(--muted);
  font-size: 0.85rem;
}

.contact-list a,
.contact-list strong {
  font-size: 1.05rem;
}

/* 404 */
.empty-state {
  text-align: center;
  padding: 64px 0 80px;
}

.empty-state .btn + .btn {
  margin-left: 10px;
}

@media (max-width: 400px) {
  .empty-state .btn {
    display: flex;
    width: 100%;
    margin: 0 0 10px;
  }

  .empty-state .btn + .btn {
    margin-left: 0;
  }
}

/* Focus */
:focus-visible {
  outline: 2px solid var(--accent);
  outline-offset: 2px;
}

.nav-links a:focus-visible {
  outline-color: #fff;
}

/* Mobile first refinements */
@media (max-width: 639px) {
  .table-wrap {
    border: 0;
  }

  .agenda-table thead {
    display: none;
  }

  .agenda-table,
  .agenda-table tbody,
  .agenda-table tr,
  .agenda-table td {
    display: block;
    width: 100%;
  }

  .agenda-table tr {
    padding: 12px 14px;
    margin-bottom: 10px;
    border: 1px solid var(--line);
    border-radius: var(--radius);
    background: var(--card);
  }

  .agenda-table tbody tr:nth-child(even) {
    background: var(--card);
  }

  .agenda-table td {
    padding: 3px 0;
    border: 0;
  }

  .agenda-table td:first-child {
    font-family: "Noto Serif SC", "Songti SC", "STSong", "SimSun", serif;
    font-weight: 700;
    color: var(--navy);
    margin-bottom: 4px;
  }

  .agenda-table td::before {
    content: attr(data-label);
    display: inline-block;
    min-width: 4.2em;
    margin-right: 8px;
    color: var(--muted);
    font-size: 0.82rem;
  }

  .agenda-table td:first-child::before {
    display: none;
  }
}

@media (max-width: 767px) {
  .nav-toggle {
    display: flex;
  }

  .nav-links {
    display: none;
    position: absolute;
    top: 100%;
    left: 0;
    right: 0;
    flex-direction: column;
    align-items: stretch;
    gap: 0;
    background: var(--navy);
    padding: 6px 12px 16px;
    border-top: 1px solid rgba(255, 255, 255, 0.1);
  }

  .site-nav.is-open .nav-links {
    display: flex;
  }

  .nav-links a {
    padding: 12px 12px;
    min-height: 44px;
  }

  .nav-links a.active {
    box-shadow: inset 3px 0 0 #fff;
  }

  .hero {
    padding: 56px 16px 60px;
  }

  .hero-actions .btn {
    flex: 1 1 100%;
  }

  .section {
    padding: 36px 0;
  }

  .page-header {
    padding-top: 24px;
  }

  body.nav-open {
    overflow: hidden;
  }
}

@media (min-width: 640px) {
  .feature-grid,
  .topic-grid {
    grid-template-columns: 1fr 1fr;
  }

  .info-grid {
    grid-template-columns: 1fr 1fr;
  }

  .footer-grid {
    grid-template-columns: 1.3fr 1fr 1fr;
  }
}

@media (min-width: 900px) {
  .about-grid {
    grid-template-columns: 1.15fr 0.85fr;
    gap: 48px;
  }

  .feature-grid {
    grid-template-columns: 1fr 1fr 1fr;
  }

  .info-grid {
    grid-template-columns: repeat(4, 1fr);
  }

  .forum-layout {
    grid-template-columns: 260px 1fr;
    align-items: start;
  }

  .forum-aside {
    position: sticky;
    top: 84px;
  }

  .section {
    padding: 64px 0;
  }
}

@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
  * { transition: none !important; }
}