:root {
  color-scheme: light;
  --ivory: #f5efe7;
  --parchment: #efe3d6;
  --ink: #12100f;
  --stone: #a39282;
  --mist: #e4d7c9;
  --accent: #b1161b;
  --accent-dark: #7f0b10;
  --line: rgba(18, 16, 15, 0.16);
  --shadow: 0 18px 40px rgba(17, 16, 14, 0.08);
  --radius: 16px;
  --ease: cubic-bezier(0.22, 1, 0.36, 1);
}

* {
  box-sizing: border-box;
}

body {
  margin: 0;
  font-family: "HarmonyOS Sans SC", "PingFang SC", "Heiti SC", "Microsoft YaHei", sans-serif;
  color: var(--ink);
  background-color: var(--ivory);
  background-image:
    linear-gradient(180deg, rgba(245, 239, 231, 0.98), rgba(239, 227, 214, 0.9)),
    radial-gradient(circle at 85% 12%, rgba(177, 22, 27, 0.18), transparent 52%),
    radial-gradient(circle at 12% 6%, rgba(121, 18, 22, 0.1), transparent 45%),
    repeating-linear-gradient(90deg, rgba(18, 16, 15, 0.055) 0 1px, transparent 1px 10px),
    repeating-linear-gradient(0deg, rgba(18, 16, 15, 0.045) 0 1px, transparent 1px 10px),
    repeating-linear-gradient(45deg, rgba(18, 16, 15, 0.02) 0 1px, transparent 1px 18px);
  min-height: 100vh;
  line-height: 1.6;
}

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

a {
  color: inherit;
  text-decoration: none;
}

a:focus-visible,
button:focus-visible,
input:focus-visible,
textarea:focus-visible {
  outline: 2px solid var(--accent);
  outline-offset: 3px;
}

.site-header {
  position: sticky;
  top: 0;
  z-index: 10;
  background: rgba(246, 241, 234, 0.92);
  backdrop-filter: blur(10px);
  border-bottom: 1px solid var(--line);
}

.header-inner {
  max-width: 1120px;
  margin: 0 auto;
  padding: 20px 28px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 24px;
}

.brand {
  display: flex;
  align-items: center;
  gap: 14px;
  text-transform: uppercase;
  letter-spacing: 0.2em;
  font-size: 0.86rem;
}

.brand-logo {
  width: 44px;
  height: auto;
}

.brand-text {
  display: flex;
  flex-direction: column;
  gap: 4px;
  text-transform: none;
  letter-spacing: 0.04em;
}

.brand span {
  font-size: 1.35rem;
  letter-spacing: 0.14em;
}

.main-nav {
  display: flex;
  flex-wrap: wrap;
  gap: 16px;
  align-items: center;
  font-size: 0.95rem;
  letter-spacing: 0.1em;
}

.main-nav a {
  text-transform: uppercase;
  padding-bottom: 4px;
  border-bottom: 1px solid transparent;
  transition: border-color 0.3s var(--ease);
}

.main-nav a[aria-current="page"] {
  border-color: var(--accent);
}

.main-nav a:hover {
  border-color: var(--accent-dark);
}

.main-nav .lang-toggle {
  align-self: center;
  line-height: 1;
  border: 1px solid var(--accent);
  padding: 6px 10px;
  border-radius: 999px;
  font-size: 0.72rem;
  letter-spacing: 0.18em;
  text-transform: none;
  background: rgba(169, 27, 37, 0.08);
}

.main-nav .lang-toggle:hover {
  border-color: var(--accent-dark);
  background: rgba(169, 27, 37, 0.16);
}

.hero {
  max-width: 1120px;
  margin: 0 auto;
  padding: 72px 28px 32px;
}

.hero h1 {
  font-size: clamp(2.4rem, 4vw, 3.4rem);
  letter-spacing: 0.08em;
  text-transform: uppercase;
  margin: 0 0 18px;
}

.hero p {
  max-width: 640px;
  font-size: 1.15rem;
  margin: 0;
}

.layout {
  display: block;
  margin: 0 auto 80px;
}

.path-layout {
  display: grid;
  grid-template-columns: 180px 1fr;
  gap: 36px;
  align-items: start;
  max-width: 1120px;
  margin: 28px auto 88px;
  padding: 0 28px;
}

body[data-page="path"] .main-content {
  max-width: 100%;
  padding: 0;
}

@media (max-width: 900px) {
  .path-layout {
    grid-template-columns: 1fr;
  }
}

.seq-nav {
  padding: 18px;
  background: rgba(255, 255, 255, 0.75);
  border: 1px solid rgba(17, 16, 14, 0.08);
  border-radius: 16px;
  box-shadow: 0 16px 36px rgba(17, 16, 14, 0.06);
}

.seq-nav button {
  display: block;
  width: 100%;
  text-align: left;
  padding: 12px 14px;
  border-radius: 12px;
  border: 1px solid rgba(17, 16, 14, 0.1);
  background: rgba(255, 255, 255, 0.6);
  margin-bottom: 12px;
  font-family: inherit;
  font-size: 1rem;
  letter-spacing: 0.1em;
  transition: border-color 0.3s var(--ease), background 0.3s var(--ease);
}

.seq-nav button.active {
  background: rgba(196, 106, 47, 0.15);
  border-color: rgba(196, 106, 47, 0.4);
}

.seq-title {
  margin: 0 0 12px;
  font-size: 1.2rem;
  letter-spacing: 0.12em;
  text-transform: uppercase;
}

.book-list {
  list-style: none;
  padding: 0;
  margin: 16px 0 0;
  background: rgba(255, 255, 255, 0.55);
  border: 1px solid var(--line);
  border-radius: 16px;
  padding: 18px 20px;
  box-shadow: var(--shadow);
  width: 100%;
}

.book-list li {
  padding: 12px 0;
  border-bottom: 1px solid rgba(0, 0, 0, 0.06);
}

.book-list .meta {
  margin-left: 10px;
  font-size: 0.85em;
  opacity: 0.7;
}

.book-list .muted {
  opacity: 0.65;
  border-bottom: none;
  padding: 12px 0;
}

.book-list .series-line {
  border-bottom: none;
}

.book-list .series-line + .series-line {
  margin-top: 12px;
}

.book-list .series-line a {
  display: flex;
  align-items: center;
  gap: 16px;
  padding: 16px 20px;
  border-radius: 14px;
  border: 1px solid rgba(0, 0, 0, 0.06);
  background: rgba(255, 255, 255, 0.7);
  width: 100%;
}

.series-thumb {
  width: 110px;
  height: 110px;
  object-fit: cover;
  border-radius: 12px;
  border: 1px solid rgba(0, 0, 0, 0.08);
  flex-shrink: 0;
}

.series-name {
  flex: 1;
  font-size: 1.05rem;
  letter-spacing: 0.08em;
}

body[data-page="path"] .book-list {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 18px;
}

body[data-page="path"] .book-list li {
  padding: 0;
}

body[data-page="path"] .book-list .series-line + .series-line {
  margin-top: 0;
}

@media (max-width: 900px) {
  body[data-page="path"] .book-list {
    grid-template-columns: 1fr;
  }
}

.series-card {
  text-decoration: none;
}

.series-card--active {
  border-color: rgba(123, 106, 75, 0.4);
  box-shadow: 0 12px 26px rgba(123, 106, 75, 0.12);
}

.series-rail {
  border-right: 1px solid var(--line);
  padding-right: 24px;
  position: sticky;
  top: 120px;
  align-self: start;
}

.series-rail h3 {
  text-transform: uppercase;
  font-size: 0.85rem;
  letter-spacing: 0.18em;
  margin: 0 0 16px;
}

.series-rail ul {
  list-style: none;
  padding: 0;
  margin: 0;
  display: grid;
  gap: 10px;
}

.series-rail a {
  display: inline-block;
  font-size: 0.95rem;
  letter-spacing: 0.04em;
  color: var(--accent-dark);
}

.series-rail a:hover {
  color: var(--ink);
}

.content-block {
  background: rgba(255, 255, 255, 0.7);
  border: 1px solid rgba(17, 16, 14, 0.08);
  border-radius: var(--radius);
  padding: 30px;
  box-shadow: 0 16px 36px rgba(17, 16, 14, 0.06);
}

.content-block + .content-block {
  margin-top: 24px;
}

.main-content {
  max-width: 1120px;
  margin: 0 auto;
  padding: 0 28px;
}

.section-title {
  text-transform: uppercase;
  letter-spacing: 0.16em;
  font-size: 0.95rem;
  margin-bottom: 16px;
  color: rgba(17, 16, 14, 0.72);
}

.sub-title {
  font-size: 0.9rem;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: rgba(17, 16, 14, 0.65);
  margin: 0 0 12px;
}

.grid {
  display: grid;
  gap: 20px;
}

.grid.two {
  grid-template-columns: repeat(auto-fit, minmax(260px, 1fr));
}

.card {
  border: 1px solid rgba(17, 16, 14, 0.08);
  border-radius: 16px;
  padding: 18px;
  background: rgba(255, 255, 255, 0.85);
  display: grid;
  gap: 14px;
  min-height: 140px;
}

.book-cover {
  width: 100%;
  height: 200px;
  object-fit: cover;
  border-radius: 12px;
  border: 1px solid rgba(31, 30, 26, 0.08);
}

body[data-page="series-detail"] .grid {
  grid-template-columns: repeat(auto-fit, minmax(220px, 1fr));
}

body[data-page="series-detail"] .book-cover {
  height: auto;
  aspect-ratio: 4 / 3;
}

.card h4 {
  margin: 0;
  font-size: 1.2rem;
}

.card .meta {
  font-size: 0.95rem;
  color: rgba(17, 16, 14, 0.7);
  letter-spacing: 0.05em;
  text-transform: uppercase;
}

.card p {
  margin: 0;
}

.card .pill {
  display: inline-flex;
  align-items: center;
  padding: 6px 12px;
  border-radius: 999px;
  border: 1px solid var(--line);
  font-size: 0.85rem;
  text-transform: uppercase;
  letter-spacing: 0.08em;
  color: var(--accent-dark);
  background: rgba(255, 255, 255, 0.8);
}

.button {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  padding: 10px 18px;
  border-radius: 999px;
  border: 1px solid var(--accent-dark);
  text-transform: uppercase;
  letter-spacing: 0.12em;
  font-size: 0.85rem;
  transition: background 0.3s var(--ease), color 0.3s var(--ease);
}

.button:hover {
  background: var(--accent-dark);
  color: var(--ivory);
}

.note {
  font-size: 0.95rem;
  color: rgba(31, 30, 26, 0.7);
}

.footer {
  border-top: 1px solid var(--line);
  padding: 30px 28px 56px;
  font-size: 0.85rem;
  text-transform: uppercase;
  letter-spacing: 0.12em;
  display: flex;
  justify-content: space-between;
  flex-wrap: wrap;
  gap: 16px;
}

.footer a {
  color: var(--accent-dark);
}

.reveal {
  opacity: 1;
  transform: translateY(0);
}

.js-enabled .reveal {
  opacity: 0;
  transform: translateY(12px);
  transition: opacity 0.7s var(--ease), transform 0.7s var(--ease);
}

.js-enabled .reveal.is-visible {
  opacity: 1;
  transform: translateY(0);
}

.no-anim .reveal {
  opacity: 1;
  transform: translateY(0);
  transition: none;
}

.page-intro {
  opacity: 1;
  transform: translateY(0);
}

.js-enabled .page-intro {
  opacity: 0;
  transform: translateY(10px);
}

body.is-ready .page-intro {
  animation: rise 0.9s var(--ease) forwards;
}

.no-anim .page-intro {
  opacity: 1;
  transform: translateY(0);
  animation: none;
}

@keyframes rise {
  from {
    opacity: 0;
    transform: translateY(18px);
  }
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

.form {
  display: grid;
  gap: 16px;
}

.form label {
  font-size: 0.9rem;
  text-transform: uppercase;
  letter-spacing: 0.12em;
}

.form input,
.form textarea {
  width: 100%;
  padding: 12px 14px;
  border-radius: 12px;
  border: 1px solid var(--line);
  background: rgba(255, 255, 255, 0.75);
  font-family: inherit;
  font-size: 1rem;
}

.form textarea {
  min-height: 140px;
  resize: vertical;
}

@media (max-width: 900px) {
  .series-rail {
    border-right: none;
    border-bottom: 1px solid var(--line);
    padding-bottom: 20px;
    position: static;
  }

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

@media (min-width: 920px) {
  .grid.two {
    grid-template-columns: 1fr 1fr;
  }
}

@media (max-width: 919px) {
  .grid.two {
    grid-template-columns: 1fr;
  }
}

[data-featured-mengzi],
[data-featured-mengxue],
[data-featured-xunzi],
[data-featured-lunyu] {
  display: grid;
  gap: 16px;
  grid-template-columns: repeat(auto-fit, minmax(220px, 1fr));
}

body[data-page="home"] .series-card .book-cover {
  height: 260px;
}

[data-series-overview] .grid {
  grid-template-columns: repeat(auto-fit, minmax(260px, 1fr));
}

@media (max-width: 700px) {
  [data-series-overview] .grid {
    grid-template-columns: 1fr;
  }
}

@media (max-width: 600px) {
  .hero {
    padding-top: 70px;
  }

  .hero h1 {
    letter-spacing: 0.06em;
  }

  .content-block {
    padding: 24px;
  }
}