:root {
  --bg: #e8ece8;
  --bg-soft: #f4f7f2;
  --surface: rgba(248, 250, 246, 0.82);
  --surface-strong: #fbfdf9;
  --surface-dark: #1d2420;
  --text: #1f2622;
  --text-soft: #59655d;
  --text-invert: #eef4ef;
  --line: rgba(40, 52, 43, 0.12);
  --accent: #4e7a62;
  --accent-soft: #9ec2a8;
  --accent-deep: #345542;
  --gold: #b99854;
  --shadow: 0 24px 60px rgba(35, 48, 39, 0.1);
  --radius-xl: 30px;
  --radius-lg: 22px;
  --radius-md: 16px;
  --container: 1180px;
}

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

html {
  scroll-behavior: smooth;
}

body {
  margin: 0;
  color: var(--text);
  font-family: "Segoe UI Variable", "PingFang SC", "Microsoft YaHei UI", sans-serif;
  background:
    radial-gradient(circle at top left, rgba(78, 122, 98, 0.12), transparent 26%),
    radial-gradient(circle at right top, rgba(185, 152, 84, 0.08), transparent 22%),
    linear-gradient(180deg, #fbfdf9 0%, #edf2eb 48%, #e4eae4 100%);
  line-height: 1.6;
}

a {
  color: inherit;
  text-decoration: none;
}

.container {
  width: min(calc(100% - 2rem), var(--container));
  margin: 0 auto;
}

.forum-shell {
  min-height: 100vh;
}

.topbar {
  position: sticky;
  top: 0;
  z-index: 10;
  background: rgba(248, 250, 246, 0.8);
  backdrop-filter: blur(18px);
  border-bottom: 1px solid rgba(40, 52, 43, 0.08);
}

.topbar-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 1rem;
  padding: 1rem 0;
}

.brand {
  display: inline-flex;
  align-items: center;
  gap: 0.9rem;
}

.brand-mark {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-width: 4.2rem;
  height: 3.1rem;
  padding: 0 0.8rem;
  border-radius: 18px;
  background: linear-gradient(145deg, #6d9479, #3f6752);
  color: #f4faf5;
  font-weight: 800;
  letter-spacing: 0.06em;
}

.brand-copy {
  display: grid;
  gap: 0.14rem;
}

.brand-copy strong {
  font-size: 1rem;
}

.brand-copy span,
.topnav a,
.hero-text,
.hero-alert span,
.side-card p,
.section-copy,
.board-card p,
.topic-main p,
.entry-copy p,
.entry-card p {
  color: var(--text-soft);
}

.brand-copy span {
  font-size: 0.86rem;
}

.topnav {
  display: flex;
  flex-wrap: wrap;
  gap: 1.15rem;
}

.topnav a {
  font-size: 0.95rem;
}

.hero {
  padding: 5rem 0 2rem;
}

.hero-layout,
.side-grid,
.section-head,
.board-grid,
.rules-grid,
.topic-list,
.entry-layout,
.entry-grid {
  display: grid;
  gap: 1.5rem;
}

.hero-layout {
  grid-template-columns: minmax(0, 1.18fr) minmax(320px, 0.82fr);
}

.hero-copy,
.hero-side,
.side-card,
.board-card,
.topic-row,
.entry-card {
  border: 1px solid rgba(255, 255, 255, 0.46);
  box-shadow: var(--shadow);
}

.hero-copy,
.hero-side,
.board-card,
.topic-row {
  background: var(--surface);
}

.hero-copy {
  padding: 2.35rem;
  border-radius: var(--radius-xl);
}

.hero-side {
  padding: 1.25rem;
  border-radius: var(--radius-xl);
}

.eyebrow {
  margin: 0 0 0.8rem;
  font-size: 0.78rem;
  font-weight: 800;
  letter-spacing: 0.18em;
  text-transform: uppercase;
  color: var(--accent-deep);
}

.hero h1,
.section h2 {
  margin: 0;
  letter-spacing: -0.03em;
}

.hero h1 {
  max-width: 12ch;
  font-size: clamp(2.8rem, 5vw, 4.9rem);
  line-height: 0.98;
}

.hero-text {
  max-width: 62ch;
  margin: 1.2rem 0 0;
  font-size: 1.06rem;
}

.hero-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 0.9rem;
  margin-top: 1.8rem;
}

.button {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-height: 3rem;
  padding: 0.8rem 1.2rem;
  border-radius: 999px;
  font-weight: 700;
}

.button-primary {
  background: linear-gradient(145deg, #588169, #3c644f);
  color: #f6fbf7;
}

.button-secondary {
  background: rgba(255, 255, 255, 0.76);
  border: 1px solid var(--line);
}

.hero-alert {
  display: grid;
  gap: 0.35rem;
  margin-top: 1.4rem;
  padding: 1rem 1.05rem;
  border-radius: var(--radius-md);
  background: rgba(255, 255, 255, 0.58);
  border: 1px solid rgba(255, 255, 255, 0.52);
}

.hero-alert strong {
  color: var(--accent-deep);
}

.side-card {
  padding: 1.15rem;
  border-radius: var(--radius-lg);
  background: rgba(255, 255, 255, 0.7);
}

.side-card-highlight {
  background: linear-gradient(160deg, rgba(78, 122, 98, 0.15), rgba(251, 253, 249, 0.9));
}

.side-label,
.board-tag,
.topic-type,
.entry-card span {
  display: inline-block;
  margin-bottom: 0.55rem;
  font-size: 0.8rem;
  font-weight: 800;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  color: var(--accent-deep);
}

.side-card strong {
  display: block;
  font-size: 1.16rem;
}

.side-grid {
  grid-template-columns: repeat(2, minmax(0, 1fr));
}

.section {
  padding: 1.2rem 0 2rem;
}

.section-band {
  position: relative;
}

.section-band::before {
  content: "";
  position: absolute;
  inset: 1rem 0;
  background: linear-gradient(180deg, rgba(255, 255, 255, 0.2), rgba(78, 122, 98, 0.08));
  z-index: -1;
}

.section-head {
  grid-template-columns: minmax(0, 0.9fr) minmax(320px, 0.8fr);
  align-items: end;
  margin-bottom: 1.2rem;
}

.section h2 {
  font-size: clamp(2rem, 3vw, 2.95rem);
}

.section-copy {
  margin: 0;
}

.board-grid {
  grid-template-columns: repeat(2, minmax(0, 1fr));
}

.rules-grid {
  grid-template-columns: repeat(3, minmax(0, 1fr));
}

.board-card,
.rule-card,
.topic-row {
  padding: 1.45rem;
  border-radius: var(--radius-lg);
}

.rule-card {
  background: var(--surface);
  border: 1px solid rgba(255, 255, 255, 0.46);
  box-shadow: var(--shadow);
}

.rule-tag {
  display: inline-block;
  margin-bottom: 0.55rem;
  font-size: 0.8rem;
  font-weight: 800;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  color: var(--accent-deep);
}

.board-card-featured {
  background: linear-gradient(160deg, rgba(185, 152, 84, 0.14), rgba(251, 253, 249, 0.92));
}

.board-card h3,
.rule-card h3,
.topic-main h3 {
  margin: 0 0 0.7rem;
  font-size: 1.24rem;
}

.rule-card p {
  margin-bottom: 0;
  color: var(--text-soft);
}

.topic-list {
  gap: 1rem;
}

.topic-row {
  display: grid;
  grid-template-columns: minmax(0, 1fr) auto;
  align-items: start;
  gap: 1rem;
}

.topic-row-pinned {
  background: linear-gradient(160deg, rgba(78, 122, 98, 0.14), rgba(251, 253, 249, 0.92));
}

.topic-type {
  color: var(--gold);
}

.topic-meta {
  min-width: 120px;
  text-align: right;
  color: var(--text-soft);
}

.topic-meta strong {
  display: block;
  margin-top: 0.3rem;
  color: var(--accent-deep);
}

.section-dark {
  padding-top: 2.2rem;
  padding-bottom: 3rem;
}

.entry-layout {
  grid-template-columns: minmax(0, 0.82fr) minmax(0, 1.18fr);
  align-items: start;
  padding: 2rem;
  border-radius: var(--radius-xl);
  background:
    radial-gradient(circle at top left, rgba(158, 194, 168, 0.16), transparent 28%),
    linear-gradient(160deg, #263029 0%, #1c231e 100%);
  color: var(--text-invert);
  box-shadow: 0 26px 70px rgba(23, 31, 26, 0.24);
}

.entry-copy .eyebrow,
.entry-card span {
  color: var(--accent-soft);
}

.entry-copy h2 {
  margin: 0 0 0.9rem;
  font-size: clamp(2rem, 3vw, 3rem);
}

.entry-grid {
  grid-template-columns: repeat(3, minmax(0, 1fr));
}

.entry-card {
  padding: 1.2rem;
  border-radius: var(--radius-lg);
  background: rgba(248, 250, 246, 0.08);
  border: 1px solid rgba(248, 250, 246, 0.12);
}

.entry-card strong {
  display: block;
  margin-bottom: 0.55rem;
  color: var(--text-invert);
  font-size: 1.16rem;
}

.footer {
  padding: 0 0 2.4rem;
}

.footer-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 1rem;
  padding: 1.4rem 1.5rem;
  border-radius: var(--radius-lg);
  background: rgba(248, 250, 246, 0.6);
  border: 1px solid rgba(255, 255, 255, 0.42);
  box-shadow: var(--shadow);
}

.footer-inner p {
  margin-bottom: 0;
  color: var(--text-soft);
}

.footer-links {
  display: flex;
  flex-wrap: wrap;
  gap: 1rem;
}

@media (max-width: 1080px) {
  .hero-layout,
  .section-head,
  .board-grid,
  .rules-grid,
  .entry-layout,
  .entry-grid {
    grid-template-columns: 1fr;
  }

  .hero h1 {
    max-width: none;
  }
}

@media (max-width: 760px) {
  .topbar-inner {
    flex-direction: column;
    align-items: flex-start;
  }

  .topnav {
    gap: 0.8rem;
  }

  .hero {
    padding-top: 3.8rem;
  }

  .hero-copy,
  .hero-side,
  .side-card,
  .board-card,
  .rule-card,
  .topic-row,
  .entry-layout,
  .entry-card,
  .footer-inner {
    padding: 1.2rem;
  }

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

  .topic-row {
    grid-template-columns: 1fr;
  }

  .topic-meta {
    text-align: left;
  }

  .footer-inner {
    flex-direction: column;
    align-items: flex-start;
  }
}