:root {
  --c-snow: #FDF6E3;
  --c-glacier: #5B8FB9;
  --c-ink: #2E2A24;
  --c-flame: #D35400;
  --c-rio: #A63A2B;
  --c-gold: #D4A017;
  --c-sand: #E8E0D5;
  --c-night: #1A2E3F;
  --font-heading: "Noto Sans SC", "Microsoft YaHei", sans-serif;
  --font-body: "Open Sans", "Noto Sans SC", sans-serif;
  --font-mono: "Roboto Mono", "Courier New", monospace;
}

*, *::before, *::after {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}

html {
  scroll-behavior: smooth;
  scroll-padding-top: 7rem;
}

body {
  background: var(--c-snow);
  color: var(--c-ink);
  font-family: var(--font-body);
  line-height: 1.6;
  overflow-x: hidden;
  -webkit-font-smoothing: antialiased;
}

h1, h2, h3, h4, h5, h6 {
  font-family: var(--font-heading);
  line-height: 1.2;
}

a {
  color: var(--c-glacier);
  text-decoration-thickness: 0.08em;
  text-underline-offset: 0.15em;
}

a:hover {
  color: var(--c-flame);
}

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

input, button, textarea, select {
  font-family: inherit;
  color: inherit;
}

button {
  cursor: pointer;
  background: none;
  border: none;
}

ul, ol {
  list-style-position: inside;
}

[hidden] {
  display: none !important;
}

:focus-visible {
  outline: 3px solid var(--c-flame);
  outline-offset: 3px;
}

.sr-only {
  position: absolute;
  width: 1px;
  height: 1px;
  padding: 0;
  margin: -1px;
  overflow: hidden;
  clip: rect(0, 0, 0, 0);
  white-space: nowrap;
  border: 0;
}

.container {
  width: 100%;
  max-width: 1200px;
  margin-inline: auto;
  padding-inline: 1.25rem;
}

.skip-link {
  position: fixed;
  top: 0;
  left: 0;
  z-index: 2000;
  transform: translateY(-120%);
  background: var(--c-ink);
  color: var(--c-snow);
  padding: 0.5rem 1.25rem;
  text-decoration: none;
  font-weight: 700;
  transition: transform 0.2s ease;
}

.skip-link:focus {
  transform: translateY(0);
  color: var(--c-snow);
}

.site-header {
  position: sticky;
  top: 0;
  z-index: 50;
  background: var(--c-snow);
  border-bottom: 4px solid var(--c-glacier);
}

.site-header::before {
  content: "";
  display: block;
  height: 4px;
  background: repeating-linear-gradient(90deg, var(--c-flame) 0 14px, var(--c-gold) 0 28px, var(--c-glacier) 0 42px, var(--c-rio) 0 56px);
}

.site-header-top {
  background: var(--c-night);
  color: var(--c-snow);
  font-family: var(--font-mono);
  font-size: 0.75rem;
  line-height: 1.2;
  border-bottom: 2px solid var(--c-rio);
}

.site-header-top__inner {
  display: flex;
  justify-content: space-between;
  align-items: center;
  min-height: 2.2rem;
  gap: 1rem;
}

.site-header-top__slogan {
  display: flex;
  align-items: center;
  gap: 0.5rem;
  font-weight: 700;
  letter-spacing: 0.06em;
}

.site-header-top__mark {
  width: 0.55rem;
  height: 0.55rem;
  background: var(--c-flame);
  clip-path: polygon(50% 0%, 100% 50%, 50% 100%, 0% 50%);
  flex: 0 0 auto;
}

.site-header-top__tagline {
  color: var(--c-gold);
  text-transform: uppercase;
  letter-spacing: 0.1em;
}

.site-header-main {
  background: var(--c-snow);
}

.site-header-main__inner {
  display: flex;
  align-items: center;
  gap: 1rem;
  padding-block: 0.75rem;
}

.site-brand {
  display: inline-flex;
  flex-direction: column;
  line-height: 1.1;
  text-decoration: none;
  color: var(--c-ink);
  flex-shrink: 0;
}

.site-brand:hover {
  color: var(--c-ink);
}

.site-brand__logo {
  font-family: var(--font-heading);
  font-size: 1.9rem;
  font-weight: 900;
  letter-spacing: 0.02em;
}

.site-brand__desc {
  font-family: var(--font-mono);
  font-size: 0.68rem;
  color: var(--c-glacier);
  text-transform: uppercase;
  letter-spacing: 0.2em;
  margin-top: 0.1rem;
}

.site-nav {
  position: fixed;
  top: 0;
  right: 0;
  bottom: 0;
  width: min(80vw, 22rem);
  background: var(--c-snow);
  border-left: 4px solid var(--c-glacier);
  box-shadow: -12px 0 30px rgba(0, 0, 0, 0.2);
  transform: translateX(102%);
  transition: transform 0.3s ease;
  z-index: 1000;
  padding: 1rem;
  display: flex;
  flex-direction: column;
  overflow-y: auto;
}

.site-nav[data-open="true"] {
  transform: translateX(0);
}

.nav-close {
  align-self: flex-end;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 2.25rem;
  height: 2.25rem;
  border: 2px solid var(--c-ink);
  background: var(--c-sand);
  color: var(--c-ink);
  font-size: 1.4rem;
  line-height: 1;
  margin-bottom: 1rem;
  box-shadow: 2px 2px 0 var(--c-ink);
}

.nav-close:hover {
  background: var(--c-flame);
  color: var(--c-snow);
}

.site-nav__list {
  list-style: none;
  display: flex;
  flex-direction: column;
  gap: 0.25rem;
}

.site-nav__item {
  list-style: none;
}

.site-nav__link {
  display: block;
  text-decoration: none;
  color: var(--c-ink);
  font-family: var(--font-heading);
  font-weight: 700;
  padding: 0.75rem 0.5rem;
  border-bottom: 2px solid var(--c-sand);
}

.site-nav__link::before {
  content: "◆";
  color: var(--c-flame);
  margin-right: 0.4em;
  font-size: 0.7em;
  vertical-align: 0.15em;
}

.site-nav__link:hover {
  color: var(--c-flame);
  background: var(--c-sand);
}

.site-nav__link[aria-current="page"] {
  background: var(--c-glacier);
  color: var(--c-snow);
  border-bottom-color: var(--c-rio);
}

.header-search {
  display: flex;
  align-items: stretch;
  border: 2px solid var(--c-ink);
  background: #fff;
  box-shadow: 3px 3px 0 var(--c-glacier);
  flex: 1 1 140px;
  min-width: 0;
}

.header-search__input {
  border: none;
  background: transparent;
  padding: 0.5rem 0.75rem;
  font-size: 0.9rem;
  width: 100%;
  min-width: 0;
}

.header-search__input:focus {
  outline: none;
}

.header-search__btn {
  background: var(--c-glacier);
  color: var(--c-snow);
  border: none;
  font-weight: 700;
  padding: 0.5rem 0.9rem;
  white-space: nowrap;
  clip-path: polygon(0 0, 100% 0, calc(100% - 4px) 100%, 0 100%);
}

.header-search__btn:hover {
  background: var(--c-flame);
}

.nav-toggle {
  display: inline-flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  width: 2.75rem;
  height: 2.75rem;
  background: var(--c-ink);
  border: 2px solid var(--c-ink);
  box-shadow: 2px 2px 0 var(--c-flame);
  flex-shrink: 0;
  padding: 0.5rem;
}

.nav-toggle__bars {
  display: flex;
  flex-direction: column;
  gap: 5px;
  width: 100%;
}

.nav-toggle__bar {
  display: block;
  height: 3px;
  background: var(--c-snow);
  transition: transform 0.2s ease, opacity 0.2s ease;
}

.nav-toggle[aria-expanded="true"] .nav-toggle__bar:nth-child(1) {
  transform: translateY(8px) rotate(45deg);
}

.nav-toggle[aria-expanded="true"] .nav-toggle__bar:nth-child(2) {
  opacity: 0;
}

.nav-toggle[aria-expanded="true"] .nav-toggle__bar:nth-child(3) {
  transform: translateY(-8px) rotate(-45deg);
}

.site-footer {
  background: var(--c-night);
  color: #e8e0d5;
  border-top: 6px solid var(--c-flame);
}

.site-footer__grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 2rem;
  padding-block: 2.5rem 1.25rem;
}

.site-footer__logo {
  font-family: var(--font-heading);
  font-size: 1.6rem;
  font-weight: 900;
  color: var(--c-snow);
}

.site-footer__slogan {
  color: var(--c-gold);
  font-weight: 700;
  margin-top: 0.25rem;
}

.site-footer__trust {
  margin-top: 0.75rem;
  color: #b8c7d2;
  font-size: 0.875rem;
  max-width: 35rem;
}

.site-footer__links {
  display: flex;
  flex-direction: column;
}

.site-footer__heading {
  font-family: var(--font-mono);
  font-size: 0.9rem;
  text-transform: uppercase;
  letter-spacing: 0.08em;
  color: var(--c-gold);
  margin-bottom: 0.75rem;
  border-left: 4px solid var(--c-flame);
  padding-left: 0.5rem;
}

.site-footer__list {
  list-style: none;
  display: flex;
  flex-direction: column;
  gap: 0.4rem;
}

.site-footer__list a {
  color: var(--c-snow);
  text-decoration: none;
}

.site-footer__list a:hover {
  color: var(--c-flame);
}

.site-footer__contact p {
  font-size: 0.875rem;
  margin-bottom: 0.4rem;
}

.site-footer__bottom {
  border-top: 1px solid rgba(255, 255, 255, 0.15);
  padding-block: 1rem;
  background: rgba(0, 0, 0, 0.2);
}

.site-footer__bottom-inner {
  display: flex;
  flex-wrap: wrap;
  justify-content: space-between;
  gap: 0.5rem 1rem;
  font-size: 0.8rem;
  color: #b8c7d2;
}

.site-footer__note {
  flex-basis: 100%;
  font-size: 0.75rem;
  color: #8ba0b0;
}

.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  background: var(--c-sand);
  color: var(--c-ink);
  border: 2px solid var(--c-ink);
  padding: 0.6rem 1.4rem;
  font-weight: 700;
  text-decoration: none;
  box-shadow: 4px 4px 0 var(--c-ink);
  transition: transform 0.15s, box-shadow 0.15s, background 0.15s;
}

.btn:hover {
  background: var(--c-snow);
  box-shadow: 2px 2px 0 var(--c-ink);
  transform: translate(2px, 2px);
}

.btn:active {
  box-shadow: 0 0 0 var(--c-ink);
  transform: translate(4px, 4px);
}

.btn--primary {
  background: var(--c-glacier);
  color: var(--c-snow);
}

.btn--primary:hover {
  background: var(--c-rio);
}

.btn--accent {
  background: var(--c-flame);
  color: var(--c-snow);
}

.btn--accent:hover {
  background: var(--c-rio);
}

.btn.is-active {
  background: var(--c-flame);
  color: var(--c-snow);
  box-shadow: 2px 2px 0 var(--c-ink);
  transform: translate(2px, 2px);
}

.is-active {
  background: var(--c-flame);
  color: var(--c-snow);
}

.breadcrumb {
  font-family: var(--font-mono);
  font-size: 0.8rem;
  margin-bottom: 1rem;
}

.breadcrumb__list {
  list-style: none;
  display: flex;
  flex-wrap: wrap;
  gap: 0.25rem;
}

.breadcrumb__item + .breadcrumb__item::before {
  content: "/";
  margin-right: 0.25rem;
  color: var(--c-flame);
}

.breadcrumb__link {
  text-decoration: none;
  color: var(--c-glacier);
}

.breadcrumb__link:hover {
  text-decoration: underline;
}

.breadcrumb__item--current {
  color: var(--c-gold);
  font-weight: 700;
}

.entry-content > * + * {
  margin-top: 1.25rem;
}

.entry-content h1,
.entry-content h2,
.entry-content h3,
.entry-content h4 {
  margin-top: 2rem;
}

.entry-content h1 {
  font-size: 2.8rem;
  font-weight: 900;
  letter-spacing: -0.02em;
  border-left: 6px solid var(--c-flame);
  padding-left: 0.75rem;
}

.entry-content h2 {
  font-size: 2rem;
}

.entry-content h3 {
  font-size: 1.3rem;
}

.entry-content p {
  max-width: 68ch;
}

.entry-content ul,
.entry-content ol {
  padding-left: 1.5rem;
}

.entry-content li {
  margin-bottom: 0.25rem;
}

.entry-content blockquote {
  border-left: 6px solid var(--c-glacier);
  background: var(--c-sand);
  padding: 1rem 1.25rem;
  font-style: italic;
}

.entry-content code {
  font-family: var(--font-mono);
  background: var(--c-sand);
  padding: 0.1em 0.3em;
}

.entry-content a {
  text-decoration-thickness: 0.08em;
  text-underline-offset: 0.15em;
}

.card {
  background: var(--c-sand);
  border: 2px solid var(--c-ink);
  box-shadow: 6px 6px 0 rgba(46, 42, 36, 0.15);
  padding: 1rem 1.25rem;
  position: relative;
}

.card::before {
  content: "";
  position: absolute;
  top: -2px;
  right: -2px;
  width: 18px;
  height: 6px;
  background: var(--c-flame);
}

.card:hover {
  box-shadow: 6px 6px 0 var(--c-glacier);
}

.grid {
  display: grid;
  gap: 1.5rem;
  grid-template-columns: 1fr;
}

@media (min-width: 40rem) {
  .grid--2 {
    grid-template-columns: repeat(2, 1fr);
  }

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

@media (min-width: 60rem) {
  .site-header-main__inner {
    flex-wrap: nowrap;
  }

  .site-nav {
    position: static;
    width: auto;
    height: auto;
    transform: none;
    padding: 0;
    border-left: 0;
    box-shadow: none;
    background: transparent;
    flex: 1;
    display: flex;
    justify-content: center;
    flex-direction: row;
    align-items: center;
    overflow: visible;
  }

  .site-nav__list {
    flex-direction: row;
    gap: 0.1rem;
    flex-wrap: wrap;
    justify-content: center;
  }

  .site-nav__link {
    padding: 0.5rem 0.75rem;
    border-bottom: 2px solid transparent;
  }

  .site-nav__link::before {
    content: "/";
    color: var(--c-flame);
    margin-right: 0.3em;
  }

  .site-nav__link[aria-current="page"] {
    background: var(--c-glacier);
    color: var(--c-snow);
    box-shadow: 3px 3px 0 var(--c-gold);
  }

  .nav-close {
    display: none;
  }

  .header-search {
    flex: 0 1 240px;
  }

  .nav-toggle {
    display: none;
  }
}

@media (min-width: 38rem) {
  .site-footer__grid {
    grid-template-columns: 1fr 1fr;
  }

  .site-footer__brand {
    grid-column: 1 / -1;
  }
}

@media (min-width: 60rem) {
  .site-footer__grid {
    grid-template-columns: 2fr 1fr 1.2fr;
  }

  .site-footer__brand {
    grid-column: auto;
  }
}

@media (max-width: 36rem) {
  .site-header-top__tagline {
    display: none;
  }
}

@media (prefers-reduced-motion: reduce) {
  *,
  *::before,
  *::after {
    animation: none !important;
    transition: none !important;
  }

  html {
    scroll-behavior: auto;
  }
}