:root {
  color-scheme: light;
  --brand-blue: #244a9b;
  --brand-blue-dark: #0b1f4d;
  --brand-blue-soft: rgba(36, 74, 155, 0.1);
  --brand-orange: #e97835;
  --brand-orange-dark: #b84f21;
  --brand-orange-soft: rgba(233, 120, 53, 0.12);
  --ink: #111827;
  --ink-soft: #596476;
  --paper: #f7f6ef;
  --paper-strong: #fffdf8;
  --line: rgba(36, 74, 155, 0.16);
  --dark: #081735;
}

* {
  box-sizing: border-box;
}

html {
  scroll-behavior: smooth;
}

body {
  margin: 0;
  min-height: 100vh;
  overflow-x: hidden;
  color: var(--ink);
  font-family: Inter, "PingFang SC", "Microsoft YaHei", Arial, sans-serif;
  letter-spacing: 0;
  background: var(--dark) url("../../images/banner.jpg") center / cover fixed;
}

body::before {
  content: "";
  position: fixed;
  inset: 0;
  z-index: -1;
  background:
    linear-gradient(135deg, rgba(8, 23, 53, 0.44), rgba(8, 23, 53, 0.88) 64%, rgba(233, 120, 53, 0.18)),
    radial-gradient(circle at 18% 18%, rgba(233, 120, 53, 0.2), transparent 34%);
}

a {
  color: inherit;
}

img {
  display: block;
  max-width: 100%;
}

.article-shell {
  width: min(1180px, calc(100% - clamp(16px, 4vw, 56px)));
  max-width: calc(100% - clamp(16px, 4vw, 56px));
  min-height: calc(100svh - clamp(16px, 4vw, 56px));
  margin: clamp(8px, 2vw, 28px) auto;
  overflow: clip;
  background:
    linear-gradient(180deg, rgba(255, 253, 248, 0.96), rgba(244, 247, 255, 0.92) 52%, rgba(247, 246, 239, 0.98)),
    var(--paper);
  border: 1px solid rgba(255, 253, 248, 0.66);
  border-radius: 24px;
  box-shadow: 0 28px 84px rgba(8, 23, 53, 0.32);
}

.article-header {
  position: sticky;
  top: 0;
  z-index: 20;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 18px;
  min-height: 74px;
  padding: 0 clamp(18px, 4vw, 58px);
  background: rgba(255, 253, 248, 0.92);
  border-bottom: 1px solid var(--line);
  backdrop-filter: blur(18px);
}

.brand {
  display: inline-flex;
  align-items: center;
  color: var(--ink);
  text-decoration: none;
}

.brand-logo {
  display: block;
  width: clamp(142px, 12vw, 188px);
  max-height: 50px;
  object-fit: contain;
}

.article-nav {
  display: flex;
  align-items: center;
  gap: clamp(14px, 2.2vw, 30px);
  color: rgba(17, 24, 39, 0.74);
  font-size: 14px;
}

.article-nav a {
  text-decoration: none;
}

.article-nav a:hover,
.article-nav a:focus-visible {
  color: var(--brand-blue);
}

.article-hero {
  display: grid;
  gap: 22px;
  min-width: 0;
  padding: clamp(58px, 8vw, 98px) clamp(20px, 7vw, 108px) clamp(34px, 5vw, 58px);
  border-bottom: 1px solid var(--line);
  background:
    radial-gradient(circle at 92% 10%, rgba(233, 120, 53, 0.16), transparent 28%),
    linear-gradient(135deg, rgba(244, 247, 255, 0.76), rgba(255, 247, 240, 0.54));
}

.eyebrow {
  margin: 0;
  color: var(--brand-blue);
  font-size: 12px;
  font-weight: 700;
  text-transform: uppercase;
}

.article-title {
  max-width: 900px;
  margin: 0;
  color: var(--ink);
  font-size: clamp(36px, 5.4vw, 68px);
  font-weight: 780;
  line-height: 1.12;
  overflow-wrap: anywhere;
  word-break: break-word;
}

.article-summary {
  max-width: 760px;
  margin: 0;
  color: var(--ink-soft);
  font-size: clamp(16px, 1.35vw, 19px);
  line-height: 1.8;
  overflow-wrap: anywhere;
  word-break: break-word;
}

.article-meta {
  display: flex;
  flex-wrap: wrap;
  gap: 10px 18px;
  align-items: center;
  color: var(--ink-soft);
  font-size: 13px;
}

.article-tags {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
}

.article-tag {
  display: inline-flex;
  align-items: center;
  min-height: 30px;
  padding: 0 10px;
  color: var(--brand-blue);
  border: 1px solid rgba(36, 74, 155, 0.2);
  border-radius: 999px;
  background: var(--brand-blue-soft);
  font-size: 12px;
  font-weight: 700;
}

.article-cover {
  padding: clamp(24px, 5vw, 52px) clamp(20px, 7vw, 108px) 0;
}

.article-cover img {
  width: 100%;
  max-height: 520px;
  object-fit: cover;
  border-radius: 8px;
  box-shadow: 0 18px 46px rgba(36, 74, 155, 0.14);
}

.article-content {
  max-width: 820px;
  margin: 0 auto;
  padding: clamp(34px, 6vw, 70px) clamp(20px, 5vw, 36px) clamp(70px, 9vw, 110px);
  color: var(--ink);
  font-size: 17px;
  line-height: 1.95;
  overflow-wrap: anywhere;
  word-break: break-word;
}

.article-content h1,
.article-content h2,
.article-content h3 {
  color: var(--ink);
  line-height: 1.25;
}

.article-content h1 {
  margin: 42px 0 18px;
  font-size: clamp(28px, 3.2vw, 40px);
}

.article-content h2 {
  margin: 36px 0 16px;
  font-size: clamp(24px, 2.5vw, 32px);
}

.article-content h3 {
  margin: 30px 0 14px;
  font-size: clamp(20px, 2vw, 25px);
}

.article-content p,
.article-content ul,
.article-content ol,
.article-content blockquote,
.article-content pre {
  margin: 0 0 18px;
}

.article-content ul,
.article-content ol {
  padding-left: 1.35em;
}

.article-content li {
  margin-bottom: 8px;
}

.article-content a {
  color: var(--brand-blue);
  text-decoration-thickness: 1px;
  text-underline-offset: 3px;
}

.article-content img {
  width: auto;
  margin: 28px auto;
  border-radius: 8px;
}

.article-content blockquote {
  padding: 16px 20px;
  color: var(--ink-soft);
  border-left: 4px solid var(--brand-blue);
  border-radius: 0 8px 8px 0;
  background: var(--brand-blue-soft);
}

.article-content code {
  padding: 2px 6px;
  color: var(--brand-orange);
  border-radius: 4px;
  background: var(--brand-orange-soft);
  font-family: "IBM Plex Mono", Consolas, monospace;
  font-size: 0.92em;
}

.article-content pre {
  padding: 18px;
  overflow-x: auto;
  border-radius: 8px;
  background: var(--brand-blue-dark);
}

.article-content pre code {
  padding: 0;
  color: #fff;
  background: transparent;
}

.article-footer {
  display: flex;
  flex-wrap: wrap;
  justify-content: space-between;
  gap: 14px;
  padding: 28px clamp(20px, 7vw, 108px);
  color: var(--ink-soft);
  border-top: 1px solid var(--line);
  background: rgba(244, 247, 255, 0.72);
}

.article-footer a {
  color: var(--brand-blue);
  text-decoration: none;
  font-weight: 700;
}

@media (prefers-reduced-motion: reduce) {
  html {
    scroll-behavior: auto;
  }
}

@media (max-width: 720px) {
  body {
    background-attachment: scroll;
  }

  .article-shell {
    width: calc(100% - 14px);
    max-width: calc(100% - 14px);
    margin: 7px auto;
    border-radius: 18px;
  }

  .article-header {
    min-height: 66px;
    padding-inline: 14px;
    overflow: hidden;
  }

  .brand-logo {
    width: clamp(110px, 32vw, 136px);
    max-height: 40px;
  }

  .article-nav {
    flex: 1;
    justify-content: flex-end;
    min-width: 0;
    gap: 8px;
    font-size: 12px;
  }

  .article-nav a {
    max-width: 86px;
    overflow: hidden;
    text-overflow: ellipsis;
    white-space: nowrap;
  }

  .article-nav a + a {
    display: none;
  }

  .article-title {
    font-size: clamp(30px, 8vw, 38px);
    line-height: 1.16;
    overflow-wrap: anywhere;
    word-break: break-all;
  }

  .article-content {
    font-size: 16px;
    overflow-wrap: anywhere;
    word-break: break-all;
  }
}