html {
  box-sizing: border-box;
  scroll-behavior: smooth;
}

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

:root {
  --page-bg: #f5f6f8;
  --surface: #ffffff;
  --surface-soft: #f8fafc;
  --ink: #151922;
  --ink-soft: #384252;
  --muted: #6b7280;
  --line: #d8dee8;
  --line-strong: #b8c0cc;
  --accent: #1d4ed8;
  --accent-strong: #173b8f;
  --accent-soft: #e8eefc;
  --signal: #a16207;
  --shadow: 0 14px 34px rgba(18, 24, 38, 0.08);
}

body.index {
  margin: 0;
  padding-top: 0;
  background: var(--page-bg);
  color: var(--ink);
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", "PingFang SC",
    "Microsoft YaHei", sans-serif;
}

.portal-page {
  min-height: 100vh;
  padding: 0 0 72px;
}

.portal-nav {
  position: sticky;
  top: 0;
  z-index: 20;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 18px;
  width: 100%;
  min-height: 64px;
  padding: 0 34px;
  background: #111827;
  border-bottom: 1px solid #263244;
  box-shadow: 0 10px 24px rgba(17, 24, 39, 0.18);
  backdrop-filter: blur(14px);
}

.portal-brand {
  color: #f8fafc;
  font-size: 18px;
  font-weight: 800;
  text-decoration: none;
}

.portal-tabs {
  display: flex;
  align-items: center;
  gap: 8px;
  flex-wrap: wrap;
  justify-content: flex-end;
}

.portal-tabs a,
.article-link {
  transition: color 160ms ease, border-color 160ms ease, background 160ms ease,
    transform 160ms ease;
}

.portal-tabs a {
  color: #cbd5e1;
  border: 1px solid transparent;
  border-radius: 999px;
  padding: 8px 13px;
  font-weight: 650;
  text-decoration: none;
}

.portal-tabs a:hover {
  color: #ffffff;
  background: rgba(59, 130, 246, 0.18);
  border-color: rgba(147, 197, 253, 0.35);
}

.portal-tabs a.is-active {
  color: #ffffff;
  background: rgba(59, 130, 246, 0.22);
  border-color: rgba(147, 197, 253, 0.45);
}

.profile-hero {
  display: flex;
  flex-direction: column;
  align-items: center;
  width: min(920px, calc(100% - 48px));
  margin: 24px auto 0;
  padding: 42px 28px 38px;
  text-align: center;
  background: linear-gradient(180deg, #ffffff 0%, #fbfcff 100%);
  border: 1px solid var(--line);
  border-radius: 8px;
  box-shadow: var(--shadow);
}

.profile-avatar {
  width: 116px;
  height: 116px;
  border: 4px solid #eef2f8;
  border-radius: 999px;
  object-fit: cover;
  box-shadow: 0 10px 24px rgba(18, 24, 38, 0.15);
}

.profile-hero h1 {
  display: block;
  width: 100%;
  margin: 18px auto 12px;
  padding-left: 0;
  color: var(--ink);
  font-size: 38px;
  line-height: 1.15;
  text-align: center;
}

.profile-hero p {
  max-width: 720px;
  margin: 0;
  color: var(--ink-soft);
  font-size: 16px;
  line-height: 1.85;
}

.profile-tags {
  display: flex;
  justify-content: center;
  flex-wrap: wrap;
  gap: 10px;
  margin-top: 20px;
}

.profile-tags span {
  display: inline-flex;
  align-items: center;
  min-height: 34px;
  padding: 6px 12px;
  color: var(--accent-strong);
  background: var(--accent-soft);
  border: 1px solid #c4cff2;
  border-radius: 999px;
  font-size: 13px;
  font-weight: 700;
}

.column-hero {
  width: min(920px, calc(100% - 48px));
  margin: 24px auto 0;
  padding: 34px 36px;
  background: var(--surface);
  border: 1px solid var(--line);
  border-radius: 8px;
  box-shadow: var(--shadow);
}

.column-hero p {
  margin: 0 0 8px;
  color: var(--muted);
  font-size: 12px;
  font-weight: 800;
  text-transform: uppercase;
}

.column-hero h1 {
  margin: 0 0 12px;
  padding-left: 0;
  color: var(--ink);
  font-size: 40px;
  line-height: 1.18;
  text-align: left;
}

.column-hero span {
  display: block;
  max-width: 720px;
  color: var(--ink-soft);
  font-size: 16px;
  line-height: 1.75;
}

.article-section {
  width: min(920px, calc(100% - 48px));
  margin: 48px auto 0;
}

.portal-page h2,
.portal-page h3 {
  text-align: left;
}

.section-heading {
  width: 100%;
  margin: 0 0 18px;
}

.section-heading p,
.article-meta {
  color: var(--muted);
  letter-spacing: 0;
  text-transform: uppercase;
}

.section-heading p {
  margin: 0 0 6px;
  font-size: 12px;
  font-weight: 800;
}

.section-heading h2 {
  margin: 0;
  padding-left: 0;
  color: var(--ink);
  font-size: 28px;
  line-height: 1.2;
  text-align: left;
  text-indent: 0;
}

.article-list {
  display: grid;
  gap: 28px;
}

.article-card {
  display: grid;
  grid-template-columns: 300px minmax(0, 1fr);
  gap: 0;
  overflow: hidden;
  width: 100%;
  margin-inline: 0;
  background: var(--surface);
  border: 1px solid var(--line);
  border-radius: 8px;
  box-shadow: 0 12px 28px rgba(18, 24, 38, 0.07);
}

.article-cover {
  display: block;
  min-height: 214px;
  background: #e5e9f0;
  overflow: hidden;
}

.article-cover img {
  width: 100%;
  height: 100%;
  min-height: 214px;
  object-fit: cover;
  transform: scale(1.001);
  transition: transform 220ms ease;
}

.article-card:hover .article-cover img {
  transform: scale(1.04);
}

.article-body {
  display: flex;
  flex-direction: column;
  align-items: flex-start;
  justify-content: center;
  min-height: 214px;
  padding: 26px 30px 26px 26px;
}

.article-meta {
  display: flex;
  align-items: center;
  gap: 12px;
  margin-bottom: 10px;
  font-size: 12px;
  font-weight: 800;
}

.article-meta span {
  color: var(--accent);
}

.article-card h3 {
  margin: 0 0 12px;
  padding-left: 0;
  font-size: 23px;
  line-height: 1.32;
  text-align: left;
  text-indent: 0;
  width: 100%;
}

.article-card h3 a {
  display: inline;
  color: var(--ink);
  text-decoration: none;
}

.article-card h3 a:hover {
  color: var(--accent);
}

.article-card p {
  margin: 0;
  color: var(--ink-soft);
  font-size: 15px;
  line-height: 1.75;
}

.article-link {
  margin-top: 18px;
  color: var(--accent);
  font-weight: 750;
  text-decoration: none;
}

.article-link:hover {
  color: var(--accent-strong);
}

@media (max-width: 760px) {
  .portal-nav {
    position: static;
    align-items: flex-start;
    flex-direction: column;
    padding: 14px 16px;
  }

  .portal-tabs {
    justify-content: flex-start;
  }

  .profile-hero {
    width: min(100% - 24px, 920px);
    margin-top: 14px;
    padding: 38px 18px 34px;
  }

  .column-hero {
    width: min(100% - 24px, 920px);
    margin-top: 14px;
    padding: 26px 20px;
  }

  .profile-avatar {
    width: 92px;
    height: 92px;
  }

  .profile-hero h1 {
    font-size: 32px;
  }

  .article-section {
    width: min(100% - 24px, 920px);
    margin-top: 38px;
  }

  .article-card {
    grid-template-columns: 1fr;
  }

  .article-body {
    padding: 22px;
  }
}