:root {
  --brand: #8b1a1a;
  --brand-dark: #6d1212;
  --brand-light: #b83232;
  --accent: #c9a24b;
  --accent-soft: #e8d5a3;
  --ink: #2a1e1e;
  --ink-soft: #5a4a4a;
  --paper: #faf6ee;
  --paper-alt: #f2ead9;
  --card: #ffffff;
  --border: rgba(139, 26, 26, 0.12);
  --glass: rgba(255, 255, 255, 0.6);
  --glass-border: rgba(255, 255, 255, 0.35);
  --shadow-sm: 0 2px 8px rgba(42, 30, 30, 0.06);
  --shadow-md: 0 8px 24px rgba(42, 30, 30, 0.1);
  --shadow-lg: 0 16px 48px rgba(42, 30, 30, 0.16);
  --radius-sm: 10px;
  --radius-md: 16px;
  --radius-lg: 24px;
  --radius-xl: 32px;
  --bg-page: radial-gradient(circle at 12% 8%, #fdf3e3 0%, transparent 45%),
    radial-gradient(circle at 88% 4%, #f6e2d8 0%, transparent 40%),
    linear-gradient(180deg, #faf6ee 0%, #f4ecdd 100%);
  --bg-header: linear-gradient(135deg, #8b1a1a 0%, #a82626 55%, #6d1212 100%);
  --font-body: "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", "Noto Sans SC", system-ui, -apple-system, sans-serif;
  --font-serif: "Songti SC", "STSong", "Noto Serif SC", "SimSun", serif;
  --ease: cubic-bezier(0.22, 0.61, 0.36, 1);
  --transition: 0.32s var(--ease);
}

@media (prefers-color-scheme: dark) {
  :root {
    --ink: #f0e7dd;
    --ink-soft: #c3b4a8;
    --paper: #17110f;
    --paper-alt: #1f1815;
    --card: #241b18;
    --border: rgba(201, 162, 75, 0.18);
    --glass: rgba(36, 27, 24, 0.6);
    --glass-border: rgba(201, 162, 75, 0.22);
    --shadow-sm: 0 2px 8px rgba(0, 0, 0, 0.4);
    --shadow-md: 0 8px 24px rgba(0, 0, 0, 0.5);
    --shadow-lg: 0 16px 48px rgba(0, 0, 0, 0.6);
    --bg-page: radial-gradient(circle at 12% 8%, #2a1c17 0%, transparent 45%),
      radial-gradient(circle at 88% 4%, #2b1a1a 0%, transparent 40%),
      linear-gradient(180deg, #17110f 0%, #120d0b 100%);
    --bg-header: linear-gradient(135deg, #4a0f0f 0%, #6d1212 55%, #3a0b0b 100%);
    --accent-soft: #8a6d33;
  }
}

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

html {
  -webkit-text-size-adjust: 100%;
  scroll-behavior: smooth;
}

body {
  margin: 0;
  font-family: var(--font-body);
  font-size: 16px;
  line-height: 1.78;
  color: var(--ink);
  background: var(--bg-page);
  background-attachment: fixed;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
  overflow-x: hidden;
}

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

a {
  color: var(--brand-light);
  text-decoration: none;
  transition: color var(--transition), opacity var(--transition);
}

a:hover,
a:focus-visible {
  color: var(--accent);
  text-decoration: underline;
  text-underline-offset: 3px;
}

a:focus-visible,
button:focus-visible,
summary:focus-visible {
  outline: 2px solid var(--accent);
  outline-offset: 3px;
  border-radius: 4px;
}

h1,
h2,
h3,
h4 {
  font-family: var(--font-serif);
  line-height: 1.35;
  color: var(--ink);
  margin: 0 0 0.6em;
  letter-spacing: 0.02em;
  font-weight: 700;
}

h1 {
  font-size: clamp(1.5rem, 3.4vw, 2.35rem);
}

h2 {
  font-size: clamp(1.35rem, 2.6vw, 1.85rem);
  position: relative;
  padding-left: 18px;
}

h2::before {
  content: "";
  position: absolute;
  left: 0;
  top: 0.18em;
  bottom: 0.18em;
  width: 6px;
  border-radius: 6px;
  background: linear-gradient(180deg, var(--brand) 0%, var(--accent) 100%);
}

h3 {
  font-size: clamp(1.1rem, 1.9vw, 1.3rem);
  color: var(--brand);
}

@media (prefers-color-scheme: dark) {
  h3 {
    color: var(--accent);
  }
}

p {
  margin: 0 0 1em;
  color: var(--ink-soft);
}

ul,
ol {
  margin: 0 0 1em;
  padding-left: 1.4em;
  color: var(--ink-soft);
}

li {
  margin-bottom: 0.45em;
}

blockquote {
  margin: 0 0 1.1em;
  padding: 18px 22px;
  border-left: 4px solid var(--accent);
  border-radius: 0 var(--radius-md) var(--radius-md) 0;
  background: var(--glass);
  -webkit-backdrop-filter: blur(12px);
  backdrop-filter: blur(12px);
  border-top: 1px solid var(--glass-border);
  border-right: 1px solid var(--glass-border);
  border-bottom: 1px solid var(--glass-border);
  box-shadow: var(--shadow-sm);
  transition: transform var(--transition), box-shadow var(--transition);
}

blockquote:hover {
  transform: translateX(4px);
  box-shadow: var(--shadow-md);
}

blockquote p {
  margin: 0;
  font-style: italic;
  color: var(--ink);
}

time {
  display: inline-block;
  font-size: 0.82rem;
  color: var(--accent);
  font-weight: 600;
  letter-spacing: 0.04em;
}

details {
  background: var(--card);
  border: 1px solid var(--border);
  border-radius: var(--radius-md);
  margin-bottom: 12px;
  padding: 2px 22px;
  box-shadow: var(--shadow-sm);
  transition: box-shadow var(--transition), transform var(--transition), border-color var(--transition);
  overflow: hidden;
}

details:hover {
  box-shadow: var(--shadow-md);
  border-color: var(--accent);
}

details[open] {
  border-color: var(--accent);
  background: var(--glass);
  -webkit-backdrop-filter: blur(14px);
  backdrop-filter: blur(14px);
}

details summary {
  cursor: pointer;
  padding: 16px 0;
  font-weight: 600;
  font-size: 1.02rem;
  color: var(--ink);
  list-style: none;
  position: relative;
  padding-right: 34px;
  transition: color var(--transition);
}

details summary::-webkit-details-marker {
  display: none;
}

details summary::after {
  content: "+";
  position: absolute;
  right: 0;
  top: 50%;
  transform: translateY(-50%);
  width: 26px;
  height: 26px;
  line-height: 24px;
  text-align: center;
  border-radius: 50%;
  background: var(--paper-alt);
  color: var(--brand);
  font-size: 1.1rem;
  font-weight: 700;
  transition: transform var(--transition), background var(--transition), color var(--transition);
}

details[open] summary::after {
  content: "−";
  transform: translateY(-50%) rotate(180deg);
  background: var(--brand);
  color: #fff;
}

details summary:hover {
  color: var(--brand);
}

details p {
  padding-bottom: 16px;
  animation: fadeSlide 0.4s var(--ease) both;
}

@keyframes fadeSlide {
  from {
    opacity: 0;
    transform: translateY(-6px);
  }
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

/* ============ Header ============ */
header[role="banner"] {
  position: relative;
  background: var(--bg-header);
  color: #fdf6ea;
  padding: 0 0 34px;
  overflow: hidden;
  isolation: isolate;
}

header[role="banner"]::before {
  content: "";
  position: absolute;
  inset: 0;
  background:
    radial-gradient(circle at 18% 22%, rgba(201, 162, 75, 0.28) 0%, transparent 42%),
    radial-gradient(circle at 82% 12%, rgba(255, 255, 255, 0.14) 0%, transparent 38%),
    repeating-linear-gradient(45deg, rgba(255, 255, 255, 0.03) 0 2px, transparent 2px 22px);
  z-index: -1;
  pointer-events: none;
}

header[role="banner"]::after {
  content: "";
  position: absolute;
  left: 0;
  right: 0;
  bottom: 0;
  height: 90px;
  background: linear-gradient(180deg, transparent 0%, var(--paper) 100%);
  z-index: -1;
  pointer-events: none;
}

.brand-bar {
  max-width: 1180px;
  margin: 0 auto;
  padding: 44px 24px 12px;
  display: grid;
  grid-template-columns: auto 1fr;
  grid-template-areas:
    "logo title"
    "logo desc";
  gap: 6px 22px;
  align-items: center;
  animation: riseIn 0.7s var(--ease) both;
}

.brand-bar > a {
  grid-area: logo;
  display: inline-flex;
  border-radius: 14px;
  overflow: hidden;
  box-shadow: 0 8px 26px rgba(0, 0, 0, 0.32);
  transition: transform var(--transition), box-shadow var(--transition);
}

.brand-bar > a:hover {
  transform: scale(1.06) rotate(-2deg);
  box-shadow: 0 12px 34px rgba(0, 0, 0, 0.42);
}

.brand-bar > a img {
  width: 60px;
  height: 60px;
  border-radius: 14px;
}

.brand-bar h1 {
  grid-area: title;
  color: #fff8ec;
  margin: 0;
  text-shadow: 0 2px 14px rgba(0, 0, 0, 0.3);
  font-size: clamp(1.4rem, 3vw, 2.1rem);
  align-self: end;
}

.brand-bar p {
  grid-area: desc;
  margin: 0;
  color: rgba(255, 248, 236, 0.82);
  font-size: 0.95rem;
  max-width: 780px;
  align-self: start;
}

@keyframes riseIn {
  from {
    opacity: 0;
    transform: translateY(22px);
  }
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

/* ============ Nav ============ */
nav[role="navigation"] {
  max-width: 1180px;
  margin: 18px auto 0;
  padding: 0 24px;
  position: relative;
  z-index: 2;
}

nav[role="navigation"] ul {
  list-style: none;
  margin: 0;
  padding: 12px 16px;
  display: flex;
  flex-wrap: wrap;
  gap: 6px;
  background: rgba(255, 255, 255, 0.12);
  border: 1px solid rgba(255, 255, 255, 0.2);
  border-radius: var(--radius-lg);
  -webkit-backdrop-filter: blur(16px) saturate(140%);
  backdrop-filter: blur(16px) saturate(140%);
  box-shadow: 0 4px 20px rgba(0, 0, 0, 0.14);
}

nav[role="navigation"] li {
  margin: 0;
}

nav[role="navigation"] a {
  display: inline-block;
  padding: 7px 15px;
  border-radius: 999px;
  font-size: 0.9rem;
  color: #fdf6ea;
  white-space: nowrap;
  transition: background var(--transition), color var(--transition), transform var(--transition);
}

nav[role="navigation"] a:hover,
nav[role="navigation"] a:focus-visible {
  background: #fdf6ea;
  color: var(--brand);
  text-decoration: none;
  transform: translateY(-2px);
}

/* ============ Main layout ============ */
main[role="main"] {
  max-width: 1180px;
  margin: 0 auto;
  padding: 12px 24px 40px;
  display: flex;
  flex-direction: column;
  gap: 26px;
}

section {
  background: var(--card);
  border: 1px solid var(--border);
  border-radius: var(--radius-lg);
  padding: 30px 32px;
  box-shadow: var(--shadow-sm);
  position: relative;
  transition: box-shadow var(--transition), transform var(--transition), border-color var(--transition);
  animation: riseIn 0.65s var(--ease) both;
  scroll-margin-top: 24px;
}

section:hover {
  box-shadow: var(--shadow-md);
  border-color: rgba(201, 162, 75, 0.4);
}

section > h2 {
  margin-bottom: 1em;
}

section > h2::after {
  content: "";
  display: block;
  width: 64px;
  height: 3px;
  margin-top: 12px;
  border-radius: 3px;
  background: linear-gradient(90deg, var(--brand) 0%, var(--accent) 100%);
}

section article {
  background: var(--paper-alt);
  border: 1px solid var(--border);
  border-radius: var(--radius-md);
  padding: 20px 22px;
  margin-bottom: 14px;
  transition: transform var(--transition), box-shadow var(--transition), background var(--transition);
}

section article:hover {
  transform: translateY(-3px);
  box-shadow: var(--shadow-md);
  background: var(--card);
}

section article h3 {
  margin-bottom: 0.35em;
}

section article h3 + p {
  margin-bottom: 0.6em;
}

section article p:last-child {
  margin-bottom: 0;
}

section article a {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  font-weight: 600;
  font-size: 0.92rem;
  padding: 6px 16px;
  border-radius: 999px;
  background: linear-gradient(135deg, var(--brand) 0%, var(--brand-light) 100%);
  color: #fff8ec;
  box-shadow: 0 4px 14px rgba(139, 26, 26, 0.28);
  transition: transform var(--transition), box-shadow var(--transition), filter var(--transition);
}

section article a::after {
  content: "→";
  transition: transform var(--transition);
}

section article a:hover,
section article a:focus-visible {
  text-decoration: none;
  color: #fff8ec;
  transform: translateY(-2px);
  box-shadow: 0 8px 22px rgba(139, 26, 26, 0.4);
  filter: brightness(1.08);
}

section article a:hover::after {
  transform: translateX(4px);
}

#reviews blockquote {
  background: linear-gradient(135deg, rgba(139, 26, 26, 0.05) 0%, rgba(201, 162, 75, 0.08) 100%);
}

#sitemap ul,
#links ul {
  list-style: none;
  padding: 0;
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(150px, 1fr));
  gap: 8px;
}

#sitemap li,
#links li {
  margin: 0;
}

#sitemap a,
#links a {
  display: block;
  padding: 9px 14px;
  border-radius: var(--radius-sm);
  background: var(--paper-alt);
  border: 1px solid transparent;
  font-size: 0.9rem;
  color: var(--ink);
  transition: all var(--transition);
}

#sitemap a:hover,
#links a:hover,
#sitemap a:focus-visible,
#links a:focus-visible {
  background: var(--glass);
  -webkit-backdrop-filter: blur(10px);
  backdrop-filter: blur(10px);
  border-color: var(--accent);
  color: var(--brand);
  text-decoration: none;
  transform: translateY(-2px);
  box-shadow: var(--shadow-sm);
}

#contact p {
  display: flex;
  flex-wrap: wrap;
  gap: 4px 10px;
  padding: 10px 16px;
  margin: 0 0 8px;
  border-radius: var(--radius-sm);
  background: var(--paper-alt);
  border-left: 3px solid var(--accent);
  transition: background var(--transition), transform var(--transition);
}

#contact p:hover {
  background: var(--glass);
  transform: translateX(3px);
}

#howto ol {
  counter-reset: step;
  list-style: none;
  padding: 0;
}

#howto ol li {
  counter-increment: step;
  position: relative;
  padding: 12px 16px 12px 52px;
  margin-bottom: 10px;
  background: var(--paper-alt);
  border-radius: var(--radius-sm);
  transition: background var(--transition), transform var(--transition);
}

#howto ol li::before {
  content: counter(step);
  position: absolute;
  left: 12px;
  top: 50%;
  transform: translateY(-50%);
  width: 28px;
  height: 28px;
  line-height: 28px;
  text-align: center;
  border-radius: 50%;
  background: linear-gradient(135deg, var(--brand) 0%, var(--accent) 100%);
  color: #fff8ec;
  font-weight: 700;
  font-size: 0.85rem;
}

#howto ol li:hover {
  background: var(--glass);
  transform: translateX(3px);
}

/* ============ Footer ============ */
footer[role="contentinfo"] {
  background: linear-gradient(180deg, var(--paper-alt) 0%, var(--paper) 100%);
  border-top: 1px solid var(--border);
  padding: 44px 24px 30px;
  margin-top: 12px;
}

footer[role="contentinfo"] section {
  max-width: 1180px;
  margin: 0 auto 18px;
  padding: 22px 26px;
  background: var(--glass);
  -webkit-backdrop-filter: blur(14px) saturate(140%);
  backdrop-filter: blur(14px) saturate(140%);
  border: 1px solid var(--glass-border);
  border-radius: var(--radius-md);
  box-shadow: var(--shadow-sm);
  transition: box-shadow var(--transition), transform var(--transition);
}

footer[role="contentinfo"] section:hover {
  box-shadow: var(--shadow-md);
  transform: translateY(-2px);
}

footer[role="contentinfo"] h2 {
  font-size: 1.15rem;
  margin-bottom: 0.6em;
}

footer[role="contentinfo"] p {
  font-size: 0.9rem;
  margin-bottom: 0.5em;
}

footer[role="contentinfo"] > p {
  max-width: 1180px;
  margin: 26px auto 0;
  padding-top: 20px;
  border-top: 1px dashed var(--border);
  text-align: center;
  font-size: 0.85rem;
  color: var(--ink-soft);
}

/* ============ Responsive ============ */
@media (max-width: 860px) {
  .brand-bar {
    grid-template-columns: 1fr;
    grid-template-areas:
      "logo"
      "title"
      "desc";
    justify-items: start;
    padding-top: 32px;
    gap: 12px;
  }

  .brand-bar > a img {
    width: 52px;
    height: 52px;
  }

  nav[role="navigation"] ul {
    flex-wrap: nowrap;
    overflow-x: auto;
    -webkit-overflow-scrolling: touch;
    scrollbar-width: none;
    padding: 10px 12px;
  }

  nav[role="navigation"] ul::-webkit-scrollbar {
    display: none;
  }

  nav[role="navigation"] a {
    font-size: 0.85rem;
    padding: 6px 13px;
  }

  section {
    padding: 24px 20px;
    border-radius: var(--radius-md);
  }

  main[role="main"] {
    padding: 8px 16px 32px;
    gap: 18px;
  }

  footer[role="contentinfo"] {
    padding: 32px 16px 24px;
  }
}

@media (max-width: 520px) {
  body {
    font-size: 15px;
    line-height: 1.72;
  }

  .brand-bar {
    padding: 26px 16px 8px;
  }

  nav[role="navigation"] {
    padding: 0 16px;
    margin-top: 12px;
  }

  h2 {
    padding-left: 14px;
  }

  h2::before {
    width: 5px;
  }

  section {
    padding: 20px 16px;
  }

  section article {
    padding: 16px 16px;
  }

  details {
    padding: 2px 16px;
  }

  #sitemap ul,
  #links ul {
    grid-template-columns: repeat(auto-fill, minmax(120px, 1fr));
  }

  blockquote {
    padding: 14px 16px;
  }
}

@media (prefers-reduced-motion: reduce) {
  *,
  *::before,
  *::after {
    animation-duration: 0.001ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: 0.001ms !important;
    scroll-behavior: auto !important;
  }
}

@media print {
  header[role="banner"],
  nav[role="navigation"],
  footer[role="contentinfo"] {
    display: none;
  }

  body {
    background: #fff;
    color: #000;
  }

  section {
    box-shadow: none;
    border: 1px solid #ccc;
    page-break-inside: avoid;
  }
}