@import url("https://fonts.googleapis.com/css2?family=IBM+Plex+Sans:wght@400;500;600&family=JetBrains+Mono:wght@400;500;600&family=Space+Grotesk:wght@500;600;700&display=swap");

:root {
  color-scheme: dark;
  --ink: #07111d;
  --ink-deep: #040911;
  --surface: #0d1a27;
  --bone: #f1dfcf;
  --bone-soft: #d6c7bb;
  --muted: #9ca8b3;
  --copper: #f28a4b;
  --copper-bright: #ffad78;
  --lilac: #b9a7ff;
  --cyan: #66d9e8;
  --line: rgba(241, 223, 207, 0.14);
  --line-strong: rgba(242, 138, 75, 0.42);
  --code-bg: #050c14;
  --font-sans: "IBM Plex Sans", "Noto Sans TC", "PingFang TC", "Microsoft JhengHei", sans-serif;
  --font-display: "Space Grotesk", "Noto Sans TC", "PingFang TC", "Microsoft JhengHei", sans-serif;
  --font-mono: "JetBrains Mono", "SFMono-Regular", Menlo, Monaco, monospace;
  --page-width: 1180px;
  --reading-width: 760px;
}

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

html {
  scroll-behavior: smooth;
}

body {
  min-width: 320px;
  margin: 0;
  background:
    radial-gradient(circle at 12% 4%, rgba(102, 217, 232, 0.1), transparent 28rem),
    radial-gradient(circle at 88% 18%, rgba(242, 138, 75, 0.12), transparent 32rem),
    linear-gradient(180deg, var(--ink-deep), var(--ink) 28rem, #091522);
  color: var(--bone);
  font-family: var(--font-sans);
  font-size: 16px;
  line-height: 1.75;
  -webkit-font-smoothing: antialiased;
  text-rendering: optimizeLegibility;
}

body::before {
  position: fixed;
  z-index: -2;
  inset: 0;
  background-image:
    linear-gradient(rgba(102, 217, 232, 0.035) 1px, transparent 1px),
    linear-gradient(90deg, rgba(102, 217, 232, 0.035) 1px, transparent 1px);
  background-size: 64px 64px;
  mask-image: linear-gradient(to bottom, black, transparent 72%);
  content: "";
  pointer-events: none;
}

body::after {
  position: fixed;
  z-index: -1;
  top: 9rem;
  left: 50%;
  width: min(76vw, 900px);
  height: 26rem;
  border-radius: 50%;
  background: rgba(242, 138, 75, 0.07);
  filter: blur(120px);
  content: "";
  pointer-events: none;
  transform: translateX(-50%);
}

::selection {
  background: rgba(242, 138, 75, 0.35);
  color: #fff8f1;
}

a {
  color: inherit;
}

.skip-link {
  position: fixed;
  z-index: 100;
  top: 0.75rem;
  left: 0.75rem;
  padding: 0.65rem 0.9rem;
  border-radius: 0.5rem;
  background: var(--bone);
  color: var(--ink);
  font-family: var(--font-mono);
  font-size: 0.8rem;
  font-weight: 600;
  transform: translateY(-160%);
}

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

.site-header {
  position: sticky;
  z-index: 50;
  top: 0;
  border-bottom: 1px solid var(--line);
  background: rgba(4, 9, 17, 0.82);
  backdrop-filter: blur(20px);
}

.site-nav {
  display: flex;
  width: min(calc(100% - 2rem), var(--page-width));
  min-height: 4.75rem;
  margin: 0 auto;
  align-items: center;
  justify-content: space-between;
  gap: 2rem;
}

.brand {
  display: inline-flex;
  align-items: center;
  gap: 0.75rem;
  color: var(--bone);
  font-family: var(--font-display);
  font-size: 1rem;
  font-weight: 700;
  letter-spacing: -0.02em;
  text-decoration: none;
  white-space: nowrap;
}

.brand-signal {
  position: relative;
  display: inline-grid;
  width: 1.8rem;
  height: 1.8rem;
  border: 1px solid var(--line-strong);
  border-radius: 0.5rem;
  place-items: center;
  background: linear-gradient(145deg, rgba(242, 138, 75, 0.17), rgba(185, 167, 255, 0.07));
  box-shadow: inset 0 0 20px rgba(242, 138, 75, 0.08);
}

.brand-signal::before,
.brand-signal::after {
  position: absolute;
  content: "";
}

.brand-signal::before {
  width: 0.5rem;
  height: 0.5rem;
  border-right: 1.5px solid var(--copper);
  border-bottom: 1.5px solid var(--copper);
  transform: translateX(-0.18rem) rotate(-45deg);
}

.brand-signal::after {
  width: 0.45rem;
  height: 1.5px;
  border-radius: 999px;
  background: var(--cyan);
  transform: translate(0.28rem, 0.26rem);
}

.nav-links {
  display: flex;
  margin: 0;
  padding: 0;
  align-items: center;
  gap: 0.25rem;
  list-style: none;
}

.nav-links a {
  display: block;
  padding: 0.55rem 0.8rem;
  border-radius: 999px;
  color: var(--muted);
  font-family: var(--font-mono);
  font-size: 0.75rem;
  font-weight: 500;
  letter-spacing: 0.02em;
  text-decoration: none;
  transition: background-color 180ms ease, color 180ms ease;
}

.nav-links a:hover {
  background: rgba(241, 223, 207, 0.07);
  color: var(--bone);
}

.nav-links a[aria-current="page"] {
  background: rgba(242, 138, 75, 0.12);
  color: var(--copper-bright);
  box-shadow: inset 0 0 0 1px rgba(242, 138, 75, 0.24);
}

.article-shell {
  width: min(calc(100% - 2rem), 980px);
  margin: 0 auto;
  padding: clamp(3.5rem, 8vw, 7rem) 0 clamp(4.5rem, 9vw, 8rem);
}

.article-container {
  position: relative;
  overflow: hidden;
  padding: clamp(1.4rem, 4vw, 4.25rem);
  border: 1px solid var(--line);
  border-radius: clamp(1.25rem, 3vw, 2.25rem);
  background:
    linear-gradient(145deg, rgba(19, 35, 52, 0.88), rgba(7, 17, 29, 0.92) 55%),
    var(--surface);
  box-shadow: 0 38px 90px rgba(0, 0, 0, 0.34);
}

.article-container::before {
  position: absolute;
  top: 0;
  right: 8%;
  left: 8%;
  height: 1px;
  background: linear-gradient(90deg, transparent, var(--copper), var(--lilac), transparent);
  content: "";
  opacity: 0.8;
}

.back-button {
  display: inline-flex;
  margin-bottom: clamp(2.5rem, 5vw, 4rem);
  align-items: center;
  gap: 0.55rem;
  color: var(--muted);
  font-family: var(--font-mono);
  font-size: 0.78rem;
  font-weight: 500;
  letter-spacing: 0.02em;
  text-decoration: none;
  transition: color 180ms ease, transform 180ms ease;
}

.back-button svg {
  width: 1rem;
  height: 1rem;
  stroke: var(--copper);
}

.back-button:hover {
  color: var(--bone);
  transform: translateX(-0.2rem);
}

.article-title,
.article-meta,
.article-content {
  width: min(100%, var(--reading-width));
  margin-right: auto;
  margin-left: auto;
}

.article-title {
  margin-top: 0;
  margin-bottom: 1.5rem;
  color: var(--bone);
  font-family: var(--font-display);
  font-size: clamp(2.25rem, 6vw, 4.5rem);
  font-weight: 600;
  letter-spacing: -0.045em;
  line-height: 1.08;
  text-wrap: balance;
}

.article-meta {
  display: flex;
  margin-bottom: clamp(3rem, 7vw, 5rem);
  padding-bottom: 1.35rem;
  border-bottom: 1px solid var(--line);
  align-items: center;
  flex-wrap: wrap;
  gap: 0.65rem 1.1rem;
  color: var(--muted);
  font-family: var(--font-mono);
  font-size: 0.75rem;
}

.article-category {
  padding: 0.25rem 0.65rem;
  border: 1px solid rgba(242, 138, 75, 0.28);
  border-radius: 999px;
  background: rgba(242, 138, 75, 0.09);
  color: var(--copper-bright);
}

.article-reading-time::before {
  margin-right: 1.1rem;
  color: rgba(241, 223, 207, 0.3);
  content: "/";
}

.article-content {
  color: var(--bone-soft);
  font-size: clamp(1rem, 1.7vw, 1.075rem);
  line-height: 1.92;
  overflow-wrap: anywhere;
}

.article-content h1,
.article-content h2,
.article-content h3,
.article-content h4,
.article-content h5,
.article-content h6 {
  color: var(--bone);
  font-family: var(--font-display);
  font-weight: 600;
  letter-spacing: -0.025em;
  line-height: 1.3;
  text-wrap: balance;
}

.article-content h1 {
  margin: 3.5rem 0 1.25rem;
  font-size: clamp(2rem, 5vw, 3rem);
}

.article-content h2 {
  position: relative;
  margin: 3.75rem 0 1.2rem;
  padding-top: 1.15rem;
  font-size: clamp(1.65rem, 4vw, 2.25rem);
}

.article-content h2::before {
  position: absolute;
  top: 0;
  left: 0;
  width: 2.25rem;
  height: 2px;
  background: linear-gradient(90deg, var(--copper), var(--lilac));
  content: "";
}

.article-content h3 {
  margin: 2.75rem 0 1rem;
  color: #f4e9de;
  font-size: clamp(1.3rem, 3vw, 1.65rem);
}

.article-content h4 {
  margin: 2.25rem 0 0.8rem;
  font-size: 1.2rem;
}

.article-content h5,
.article-content h6 {
  margin: 2rem 0 0.75rem;
  font-size: 1rem;
}

.article-content p {
  margin: 0 0 1.5rem;
}

.article-content strong {
  color: #fff3e8;
  font-weight: 600;
}

.article-content em {
  color: #e9d4c2;
}

.article-content a {
  color: var(--cyan);
  text-decoration-color: rgba(102, 217, 232, 0.4);
  text-decoration-thickness: 1px;
  text-underline-offset: 0.22em;
  transition: color 180ms ease, text-decoration-color 180ms ease;
}

.article-content a:hover {
  color: #a3eef6;
  text-decoration-color: currentColor;
}

.article-content ul,
.article-content ol {
  margin: 1.25rem 0 1.75rem;
  padding-left: 1.45rem;
}

.article-content li {
  margin-bottom: 0.55rem;
  padding-left: 0.25rem;
}

.article-content li::marker {
  color: var(--copper);
  font-family: var(--font-mono);
  font-weight: 600;
}

.article-content blockquote {
  margin: 2rem 0;
  padding: 1.25rem 1.4rem;
  border: 1px solid rgba(185, 167, 255, 0.2);
  border-left: 3px solid var(--lilac);
  border-radius: 0 1rem 1rem 0;
  background: rgba(185, 167, 255, 0.06);
  color: #ddd4eb;
}

.article-content blockquote p:last-child {
  margin-bottom: 0;
}

.article-content pre {
  max-width: 100%;
  margin: 2rem 0;
  padding: clamp(1rem, 3vw, 1.5rem);
  overflow-x: auto;
  border: 1px solid rgba(102, 217, 232, 0.16);
  border-radius: 1rem;
  background: var(--code-bg);
  box-shadow: inset 0 1px 0 rgba(255, 255, 255, 0.025);
  color: #d9e4ed;
  font-family: var(--font-mono);
  font-size: clamp(0.78rem, 1.7vw, 0.9rem);
  line-height: 1.7;
  tab-size: 2;
}

.article-content code {
  font-family: var(--font-mono);
}

.article-content :not(pre) > code {
  padding: 0.15em 0.38em;
  border: 1px solid rgba(242, 138, 75, 0.2);
  border-radius: 0.35rem;
  background: rgba(242, 138, 75, 0.08);
  color: var(--copper-bright);
  font-size: 0.88em;
}

.article-content table {
  display: block;
  width: 100%;
  margin: 2rem 0;
  overflow-x: auto;
  border: 1px solid var(--line);
  border-radius: 0.85rem;
  border-collapse: collapse;
  background: rgba(4, 9, 17, 0.34);
  white-space: nowrap;
}

.article-content thead,
.article-content tbody {
  display: table;
  width: 100%;
  min-width: 36rem;
  table-layout: fixed;
}

.article-content th,
.article-content td {
  padding: 0.8rem 1rem;
  border-bottom: 1px solid var(--line);
  text-align: left;
  vertical-align: top;
  white-space: normal;
}

.article-content th {
  background: rgba(242, 138, 75, 0.08);
  color: var(--bone);
  font-family: var(--font-mono);
  font-size: 0.75rem;
  font-weight: 600;
}

.article-content td {
  color: var(--bone-soft);
  font-size: 0.92rem;
}

.article-content tr:last-child td {
  border-bottom: 0;
}

.article-content img {
  display: block;
  max-width: 100%;
  height: auto;
  margin: 2rem auto;
  border: 1px solid var(--line);
  border-radius: 1rem;
}

.article-content hr {
  height: 1px;
  margin: 3rem 0;
  border: 0;
  background: linear-gradient(90deg, transparent, rgba(242, 138, 75, 0.55), transparent);
}

.site-footer {
  border-top: 1px solid var(--line);
  background: rgba(4, 9, 17, 0.62);
}

.footer-inner {
  display: flex;
  width: min(calc(100% - 2rem), var(--page-width));
  min-height: 8rem;
  margin: 0 auto;
  padding: 2rem 0;
  align-items: center;
  justify-content: space-between;
  gap: 2rem;
}

.footer-copy {
  margin: 0.35rem 0 0;
  color: var(--muted);
  font-size: 0.8rem;
}

.footer-nav {
  display: flex;
  margin: 0;
  padding: 0;
  flex-wrap: wrap;
  gap: 0.5rem 1.25rem;
  list-style: none;
}

.footer-nav a {
  color: var(--muted);
  font-family: var(--font-mono);
  font-size: 0.72rem;
  text-decoration: none;
  transition: color 180ms ease;
}

.footer-nav a:hover,
.footer-nav a[aria-current="page"] {
  color: var(--copper-bright);
}

a:focus-visible {
  outline: 2px solid var(--cyan);
  outline-offset: 4px;
}

@media (max-width: 720px) {
  .site-nav {
    width: min(calc(100% - 1.25rem), var(--page-width));
    min-height: 4.2rem;
    gap: 0.75rem;
  }

  .brand {
    gap: 0.55rem;
    font-size: 0.82rem;
  }

  .brand-signal {
    width: 1.55rem;
    height: 1.55rem;
  }

  .nav-links {
    gap: 0;
  }

  .nav-links a {
    padding: 0.45rem 0.5rem;
    font-size: 0.66rem;
  }

  .article-shell {
    width: min(calc(100% - 1rem), 980px);
    padding-top: 2.5rem;
  }

  .article-container {
    padding: 1.25rem;
    border-radius: 1.25rem;
  }

  .article-title {
    font-size: clamp(2rem, 10vw, 3.2rem);
  }

  .article-meta {
    align-items: flex-start;
  }

  .article-content h2 {
    margin-top: 3rem;
  }

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

@media (max-width: 480px) {
  .brand-label {
    position: absolute;
    width: 1px;
    height: 1px;
    padding: 0;
    overflow: hidden;
    clip: rect(0, 0, 0, 0);
    white-space: nowrap;
    border: 0;
  }

  .nav-links a {
    padding-inline: 0.42rem;
  }

  .article-reading-time::before {
    display: none;
  }

  .article-meta {
    flex-direction: column;
  }
}

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

  *,
  *::before,
  *::after {
    animation-duration: 0.01ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: 0.01ms !important;
  }
}