:root,
.theme-normal {
  --color-bg: #f7fbff;
  --color-surface: #ffffff;
  --color-text: #102033;
  --color-muted: #52677a;
  --color-primary: #075aa3;
  --color-primary-strong: #06477f;
  --color-primary-soft: #eaf4ff;
  --color-primary-faint: #f5faff;
  --color-accent: #075aa3;
  --color-accent-strong: #06477f;
  --color-border: #c9d8e6;
  --color-border-soft: #dbe8f3;
  --color-focus: #ffb000;
  --page-max-width: 1280px;
  --font-body: 18px;
  --radius: 8px;
  --shadow-card: 0 18px 44px rgba(18, 49, 79, 0.065);
  --shadow-card-hover: 0 24px 52px rgba(7, 90, 163, 0.12);
}

.theme-contrast {
  --color-bg: #000;
  --color-surface: #111;
  --color-text: #fff;
  --color-muted: #e6e6e6;
  --color-primary: #7cc7ff;
  --color-primary-strong: #b9e2ff;
  --color-accent: #ffe66d;
  --color-border: #fff;
  --color-focus: #ffea00;
}

.theme-warm {
  --color-bg: #fff8e8;
  --color-surface: #fffdf7;
  --color-text: #2c2418;
  --color-muted: #6a5840;
  --color-primary: #8a4f00;
  --color-primary-strong: #653a00;
  --color-accent: #0f766e;
  --color-border: #dfcda8;
  --color-focus: #b45309;
}

.theme-blue {
  --color-bg: #eef7ff;
  --color-surface: #fff;
  --color-text: #0b2740;
  --color-muted: #425f78;
  --color-primary: #075985;
  --color-primary-strong: #0c4a6e;
  --color-accent: #0f766e;
  --color-border: #b7d7ee;
  --color-focus: #f59e0b;
}

.font-small { --font-body: 16px; }
.font-normal { --font-body: 18px; }
.font-large { --font-body: 22px; }
.font-xlarge { --font-body: 26px; }

* {
  box-sizing: border-box;
}

html {
  scroll-behavior: smooth;
}

body {
  margin: 0;
  background:
    radial-gradient(circle at 50% -120px, rgba(0, 88, 204, 0.10), transparent 340px),
    linear-gradient(180deg, #f9fcff 0%, var(--color-bg) 300px),
    var(--color-bg);
  color: var(--color-text);
  font-family: "Microsoft YaHei", "PingFang SC", "Noto Sans CJK SC", Arial, sans-serif;
  font-size: var(--font-body);
  line-height: 1.75;
  text-rendering: optimizeLegibility;
  overflow-x: hidden;
}

a {
  color: var(--color-primary);
  text-decoration: none;
  text-decoration-thickness: 1px;
  text-underline-offset: 4px;
  transition: color .15s ease, background-color .15s ease, text-decoration-color .15s ease;
}

a:hover {
  color: var(--color-primary-strong);
  text-decoration: underline;
}

img {
  max-width: 100%;
}

a:focus-visible,
button:focus-visible,
input:focus-visible,
textarea:focus-visible,
select:focus-visible {
  outline: 3px solid var(--color-focus);
  outline-offset: 3px;
}

.nav-list a:focus-visible,
.button:focus-visible,
.footer-grid a:focus-visible,
.item-list a:focus-visible,
.article-list a:focus-visible,
.pagination a:focus-visible {
  box-shadow: 0 0 0 4px rgba(255, 176, 0, 0.28);
}

.skip-link {
  position: fixed;
  left: 12px;
  top: 12px;
  z-index: 100;
  background: var(--color-focus);
  color: #000;
  padding: 10px 14px;
  border: 2px solid #fff;
  border-radius: var(--radius);
  box-shadow: 0 8px 20px rgba(16, 32, 51, 0.18);
  transform: translateY(-90px);
  transition: transform .15s ease;
}

.skip-link:focus,
.skip-link:focus-visible {
  transform: translateY(0);
}

.page {
  width: min(calc(100% - 56px), var(--page-max-width));
  margin: 0 auto;
}

.site-header {
  background: rgba(255, 255, 255, 0.96);
  border-bottom: 1px solid var(--color-border);
  box-shadow: 0 10px 28px rgba(16, 32, 51, 0.06);
  backdrop-filter: blur(8px);
}

.header-inner {
  padding: 16px 0;
}

.brand {
  display: flex;
  gap: 22px;
  align-items: center;
  min-height: 116px;
}

.brand-logo {
  width: clamp(88px, 10vw, 132px);
  height: auto;
  border-radius: var(--radius);
  box-shadow: 0 14px 32px rgba(11, 103, 194, 0.18);
}

.brand h1 {
  margin: 0;
  font-size: clamp(32px, 4vw, 48px);
  line-height: 1.2;
  font-weight: 800;
  letter-spacing: 0;
}

.brand p {
  margin: 6px 0 0;
  color: var(--color-muted);
}

.main-nav {
  background: var(--color-primary);
  border-top: 1px solid rgba(255, 255, 255, 0.3);
  box-shadow: inset 0 -1px 0 rgba(0, 0, 0, 0.08);
}

.nav-list {
  display: flex;
  flex-wrap: wrap;
  gap: 4px;
}

.nav-list a {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  min-height: 44px;
  padding: 7px 20px;
  color: #fff;
  text-decoration: none;
  border-radius: 6px 6px 0 0;
  font-size: 19px;
  font-weight: 700;
}

.nav-list a.active,
.nav-list a:hover,
.nav-list a:focus-visible {
  background: var(--color-primary-strong);
  text-decoration: none;
}

.nav-list img,
.footer-grid img,
.reader-toolbar img {
  width: 1.1em;
  height: 1.1em;
  filter: brightness(0) invert(1);
}

.main-content {
  padding: 34px 0 58px;
}

.hero {
  display: flex;
  justify-content: space-between;
  gap: 20px;
  align-items: center;
  padding: 26px 32px;
  background:
    linear-gradient(135deg, #ffffff 0%, #f3f8ff 100%);
  border: 1px solid var(--color-border-soft);
  border-radius: var(--radius);
  box-shadow: var(--shadow-card);
}

.hero > div {
  min-width: 0;
  max-width: 100%;
}

.hero h2 {
  margin: 0 0 8px;
  font-size: clamp(28px, 3.6vw, 38px);
  line-height: 1.25;
}

.hero p {
  margin: 0;
  color: var(--color-muted);
  line-height: 1.75;
}

.hero-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
  min-width: 0;
}

.button,
button {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  min-height: 46px;
  padding: 8px 18px;
  border: 1px solid var(--color-primary);
  border-radius: var(--radius);
  background: var(--color-primary);
  color: #fff;
  text-decoration: none;
  cursor: pointer;
  font: inherit;
  font-weight: 700;
  white-space: nowrap;
  box-shadow: 0 10px 22px rgba(11, 103, 194, 0.14);
  transition: transform .15s ease, box-shadow .15s ease, background .15s ease, border-color .15s ease, color .15s ease;
}

.button:hover,
button:hover {
  transform: translateY(-1px);
  box-shadow: 0 8px 18px rgba(11, 103, 194, 0.18);
  background: var(--color-primary-strong);
  border-color: var(--color-primary-strong);
  text-decoration: none;
}

.button.secondary {
  background: #fff;
  border-color: var(--color-primary);
  color: var(--color-primary);
  box-shadow: none;
}

.button.secondary:hover {
  background: var(--color-primary-soft);
  border-color: var(--color-primary-strong);
  color: var(--color-primary-strong);
}

.content-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 26px;
  margin-top: 28px;
  align-items: stretch;
}

.panel,
.article-list li,
.download-box,
.detail-page {
  background: var(--color-surface);
  border: 1px solid var(--color-border-soft);
  border-radius: var(--radius);
  box-shadow: var(--shadow-card);
}

.panel {
  display: flex;
  flex-direction: column;
  min-height: 560px;
  padding: 28px;
  min-width: 0;
  overflow: hidden;
  transition: border-color .15s ease, box-shadow .15s ease, transform .15s ease, background-color .15s ease;
}

.panel:hover {
  border-color: #b8d5ef;
  box-shadow: var(--shadow-card-hover);
  transform: translateY(-1px);
  background: linear-gradient(180deg, #fff 0%, #fbfdff 100%);
}

.panel-title {
  display: flex;
  gap: 10px;
  align-items: center;
  border-bottom: 1px solid var(--color-border);
  padding-bottom: 16px;
  position: relative;
}

.panel-title::after {
  content: "";
  position: absolute;
  left: 0;
  bottom: -1px;
  width: 54px;
  height: 3px;
  border-radius: 999px;
  background: var(--color-primary);
}

.panel-title img {
  width: 24px;
  height: 24px;
}

.panel-title h2 {
  margin: 0;
  font-size: 27px;
  line-height: 1.25;
}

.item-list,
.article-list {
  list-style: none;
  padding: 0;
  margin: 14px 0;
}

.item-list {
  flex: 1;
  display: grid;
  align-content: start;
}

.item-list li {
  border-bottom: 1px solid var(--color-border-soft);
  padding: 17px 0;
  border-radius: 6px;
  transition: background-color .15s ease, padding-left .15s ease, padding-right .15s ease;
}

.item-list li:last-child {
  border-bottom: 0;
}

.item-list li:hover {
  background: var(--color-primary-faint);
  padding-left: 8px;
  padding-right: 8px;
}

.item-list a {
  display: block;
  font-weight: 700;
  line-height: 1.5;
  font-size: 1.06em;
  text-decoration: underline;
  text-decoration-color: transparent;
}

.item-list a:hover,
.item-list a:focus-visible {
  background: transparent;
  text-decoration-color: currentColor;
}

time,
.meta,
.empty,
.item-list p,
.article-list p {
  color: var(--color-muted);
}

.empty {
  display: grid;
  gap: 10px;
  place-items: center;
  min-height: 220px;
  margin: 18px 0;
  padding: 28px 18px;
  border: 1px solid var(--color-border-soft);
  border-radius: var(--radius);
  background: linear-gradient(180deg, #ffffff 0%, var(--color-primary-faint) 100%);
  text-align: center;
  line-height: 1.7;
}

.empty::before {
  content: "";
  width: 56px;
  height: 42px;
  border-radius: 12px;
  background:
    linear-gradient(var(--color-primary), var(--color-primary)) 14px 14px / 28px 3px no-repeat,
    linear-gradient(var(--color-border), var(--color-border)) 14px 23px / 22px 2px no-repeat,
    var(--color-primary-soft);
  border: 1px solid var(--color-border-soft);
}

time {
  display: inline-block;
  margin-top: 4px;
  font-size: .92em;
}

.item-list p {
  margin: 8px 0 0;
  line-height: 1.85;
}

.more-link {
  display: inline-block;
  align-self: flex-start;
  margin-top: auto;
  padding: 8px 10px;
  border-radius: var(--radius);
  font-weight: 700;
}

.more-link:hover,
.more-link:focus-visible,
.pagination a:hover,
.pagination a:focus-visible {
  background: var(--color-primary-soft);
  text-decoration: none;
}

.section-heading {
  margin-bottom: 22px;
}

.section-heading h2 {
  margin: 0;
  font-size: clamp(28px, 3vw, 34px);
  line-height: 1.25;
}

.article-list {
  display: grid;
  gap: 18px;
}

.article-list li {
  padding: 22px 24px;
  border-left: 4px solid transparent;
  transition: border-color .15s ease, box-shadow .15s ease, transform .15s ease, background-color .15s ease;
}

.article-list li:hover {
  border-color: var(--color-primary);
  box-shadow: var(--shadow-card-hover);
  transform: translateY(-1px);
  background: linear-gradient(180deg, #fff 0%, #fbfdff 100%);
}

.article-list h3 {
  margin: 0 0 6px;
  font-size: 24px;
  line-height: 1.35;
}

.article-list h3 a {
  display: inline;
  text-decoration: underline;
  text-decoration-color: transparent;
}

.article-list h3 a:hover,
.article-list h3 a:focus-visible {
  text-decoration-color: currentColor;
}

.article-list p {
  line-height: 1.8;
}

.pagination {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  margin-top: 20px;
}

.pagination a,
.pagination span {
  min-height: 44px;
  padding: 8px 12px;
  border: 1px solid var(--color-border);
  border-radius: 6px;
  background: var(--color-surface);
  text-decoration: none;
}

.detail-page {
  padding: 28px 32px;
}

.reader-toolbar {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  margin-bottom: 20px;
  padding-bottom: 16px;
  border-bottom: 1px solid var(--color-border);
}

.global-toolbar {
  padding: 12px 0;
  margin-bottom: 0;
  border-bottom: 0;
  justify-content: flex-end;
}

.reader-toolbar button {
  background: var(--color-surface);
  color: var(--color-primary);
}

.reader-toolbar button img {
  filter: none;
}

.reader-toolbar button[aria-pressed="true"] {
  box-shadow: 0 0 0 3px var(--color-focus);
}

.article-header h2 {
  margin: 8px 0;
  font-size: clamp(28px, 4vw, 40px);
  line-height: 1.28;
}

.meta {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
}

.article-body {
  margin-top: 22px;
  max-width: 78ch;
  line-height: 1.85;
}

.article-body p {
  margin: 0 0 1em;
}

.download-box {
  margin-top: 22px;
  padding: 20px;
}

.download-meta {
  display: flex;
  flex-wrap: wrap;
  gap: 8px 16px;
  color: var(--color-muted);
}

.checksum {
  max-width: 100%;
  overflow-wrap: anywhere;
  color: var(--color-muted);
  font-family: Consolas, "Courier New", monospace;
  font-size: .9em;
}

.back-links {
  display: flex;
  gap: 14px;
  flex-wrap: wrap;
  margin-top: 22px;
}

.site-footer {
  border-top: 1px solid var(--color-border);
  background: linear-gradient(180deg, #fafdff 0%, #f5faff 100%);
  padding: 36px 0 30px;
}

.footer-grid {
  display: flex;
  flex-wrap: wrap;
  gap: 10px 14px;
  justify-content: center;
  align-items: center;
}

.footer-about {
  display: grid;
  gap: 10px;
  max-width: 900px;
  margin-bottom: 20px;
  text-align: center;
  color: var(--color-muted);
  line-height: 1.7;
}

.footer-about strong {
  color: var(--color-text);
}

.footer-grid a {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  min-height: 40px;
  padding: 7px 12px;
  border-radius: var(--radius);
  color: var(--color-muted);
  font-weight: 700;
}

.footer-grid a:hover,
.footer-grid a:focus-visible {
  background: var(--color-primary-soft);
  color: var(--color-primary-strong);
  text-decoration: none;
}

.footer-grid a.footer-record {
  color: var(--color-primary);
  text-decoration: underline;
  text-decoration-thickness: 1px;
  text-underline-offset: 4px;
}

.footer-grid a.footer-record:hover,
.footer-grid a.footer-record:focus-visible {
  background: var(--color-primary-soft);
  color: var(--color-primary-strong);
  text-decoration: underline;
}

.footer-grid img {
  filter: none;
}

.footer-grid a.footer-primary {
  background: var(--color-primary);
  color: #fff;
  box-shadow: 0 8px 18px rgba(11, 103, 194, 0.12);
}

.footer-grid a.footer-primary:hover,
.footer-grid a.footer-primary:focus-visible {
  background: var(--color-primary-strong);
  color: #fff;
}

.copyright {
  text-align: center;
  color: var(--color-muted);
  margin: 16px 0 0;
  font-size: .95em;
}

.state-page {
  max-width: 760px;
  margin: 0 auto;
  padding: 42px 32px;
  text-align: center;
  background: var(--color-surface);
  border: 1px solid var(--color-border-soft);
  border-radius: var(--radius);
  box-shadow: var(--shadow-card);
}

.state-page::before {
  content: "";
  display: block;
  width: 58px;
  height: 58px;
  margin: 0 auto 16px;
  border-radius: 14px;
  background:
    linear-gradient(var(--color-primary), var(--color-primary)) 16px 18px / 26px 3px no-repeat,
    linear-gradient(var(--color-border), var(--color-border)) 16px 29px / 20px 2px no-repeat,
    var(--color-primary-soft);
  border: 1px solid var(--color-border-soft);
}

.state-page h2,
.state-page h3 {
  margin: 0 0 10px;
  font-size: clamp(28px, 4vw, 38px);
  line-height: 1.25;
}

.state-page p {
  margin: 0 auto 20px;
  max-width: 36em;
  color: var(--color-muted);
}

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

@media (max-width: 900px) {
  .content-grid {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }

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

@media (max-width: 720px) {
  .content-grid {
    grid-template-columns: 1fr;
  }

  .hero-actions {
    width: 100%;
  }

  .hero-actions .button {
    flex: 1 1 160px;
  }
}

@media (max-width: 600px) {
  body {
    font-size: 16px;
    line-height: 1.72;
  }

  .page {
    width: auto;
    max-width: none;
    margin-left: 14px;
    margin-right: 14px;
  }

  .header-inner,
  .nav-list {
    margin-left: 14px;
    margin-right: 14px;
  }

  .header-inner {
    padding: 14px 0 12px;
  }

  .brand {
    align-items: center;
    flex-direction: column;
    gap: 10px;
    min-height: 0;
    text-align: center;
  }

  .brand-logo {
    width: 92px;
  }

  .brand h1 {
    font-size: 30px;
    line-height: 1.18;
  }

  .nav-list a {
    flex: 1 1 46%;
    justify-content: center;
    gap: 6px;
    min-height: 44px;
    padding: 8px 10px;
    border-radius: 6px;
    font-size: 16px;
  }

  .nav-list img {
    width: 1.05em;
    height: 1.05em;
  }

  .detail-page,
  .hero,
  .panel {
    padding: 18px;
  }

  .panel {
    min-height: 0;
    box-shadow: 0 10px 24px rgba(16, 32, 51, 0.07);
  }

  .hero h2 {
    font-size: 25px;
  }

  .hero p {
    line-height: 1.68;
  }

  .hero p,
  .hero h2,
  .panel-title h2,
  .item-list a,
  .item-list p,
  .article-list p {
    overflow-wrap: anywhere;
    word-break: break-word;
  }

  .hero-actions {
    display: grid;
    grid-template-columns: 1fr 1fr;
  }

  .hero-actions .button {
    min-width: 0;
    padding-left: 10px;
    padding-right: 10px;
    white-space: normal;
  }

  .panel-title h2 {
    font-size: 21px;
  }

  .panel-title img {
    width: 21px;
    height: 21px;
  }

  .empty {
    min-height: 160px;
    margin: 14px 0;
    padding: 22px 14px;
  }

  .empty::before {
    width: 50px;
    height: 38px;
    border-radius: 11px;
    background:
      linear-gradient(var(--color-primary), var(--color-primary)) 13px 13px / 24px 3px no-repeat,
      linear-gradient(var(--color-border), var(--color-border)) 13px 22px / 19px 2px no-repeat,
      var(--color-primary-soft);
  }

  .item-list {
    margin: 10px 0 12px;
  }

  .item-list li {
    padding: 13px 0;
  }

  .item-list a {
    font-size: 1em;
    line-height: 1.42;
  }

  .item-list p {
    margin-top: 5px;
    line-height: 1.68;
  }

  time {
    margin-top: 2px;
    font-size: .88em;
  }

  .article-list li {
    padding: 16px;
  }

  .reader-toolbar button {
    flex: 1 1 45%;
  }

  .global-toolbar {
    justify-content: stretch;
  }

  .footer-grid {
    align-items: stretch;
    flex-direction: column;
    gap: 8px;
  }

  .footer-grid a {
    justify-content: center;
  }

  .footer-about {
    gap: 8px;
    margin-bottom: 16px;
    line-height: 1.65;
  }

  .site-footer {
    padding: 28px 0 24px;
  }

  .state-page {
    padding: 30px 18px;
  }
}

@media (prefers-reduced-motion: reduce) {
  * {
    animation-duration: 0.01ms !important;
    animation-iteration-count: 1 !important;
    scroll-behavior: auto !important;
  }
}