:root {
  --ink: #12141a;
  --ink-muted: #5c616b;
  --paper: #f2f0eb;
  --paper-2: #e7e4dc;
  --wash: #faf9f6;
  --line: rgba(18, 20, 26, 0.1);
  --line-strong: rgba(18, 20, 26, 0.22);
  --cinnabar: #b42318;
  --cinnabar-deep: #8f1a12;
  --seal: #9a3412;
  --font-brand: "ZCOOL XiaoWei", "Noto Serif SC", "Songti SC", serif;
  --font-display: "Noto Serif SC", "Songti SC", "STSong", serif;
  --font-body: "Noto Sans SC", "PingFang SC", "Microsoft YaHei", sans-serif;
  --max: 56rem;
  --read: 38rem;
  --ease: cubic-bezier(0.22, 1, 0.36, 1);
}

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

html {
  scroll-behavior: smooth;
}

body {
  margin: 0;
  min-height: 100vh;
  color: var(--ink);
  font-family: var(--font-body);
  font-size: 1.0625rem;
  line-height: 1.75;
  background-color: var(--paper);
  background-image:
    radial-gradient(ellipse 90% 55% at 50% -20%, rgba(180, 35, 24, 0.06), transparent 55%),
    radial-gradient(ellipse 70% 40% at 100% 100%, rgba(18, 20, 26, 0.05), transparent 45%),
    linear-gradient(180deg, var(--wash) 0%, var(--paper) 28%, var(--paper-2) 100%);
}

body::before {
  content: "";
  position: fixed;
  inset: 0;
  pointer-events: none;
  opacity: 0.35;
  background-image: url("data:image/svg+xml,%3Csvg viewBox='0 0 200 200' xmlns='http://www.w3.org/2000/svg'%3E%3Cfilter id='n'%3E%3CfeTurbulence type='fractalNoise' baseFrequency='0.85' numOctaves='4' stitchTiles='stitch'/%3E%3C/filter%3E%3Crect width='100%25' height='100%25' filter='url(%23n)' opacity='0.55'/%3E%3C/svg%3E");
  z-index: 0;
}

body > * {
  position: relative;
  z-index: 1;
}

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

a {
  color: var(--cinnabar-deep);
  text-decoration-thickness: 1px;
  text-underline-offset: 0.2em;
}

a:hover {
  color: var(--cinnabar);
}

.wrap {
  width: min(var(--max), calc(100% - 2.5rem));
  margin-inline: auto;
}

.wrap-narrow {
  width: min(var(--read), calc(100% - 2.5rem));
  margin-inline: auto;
}

/* —— Header —— */
.site-header {
  position: sticky;
  top: 0;
  z-index: 40;
  background: rgba(250, 249, 246, 0.82);
  backdrop-filter: blur(12px);
  border-bottom: 1px solid var(--line);
}

.site-header .inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 1rem;
  padding: 1rem 0;
}

.brand {
  display: inline-flex;
  align-items: center;
  gap: 0.55rem;
  font-family: var(--font-brand);
  font-size: 1.65rem;
  letter-spacing: 0.18em;
  color: var(--ink);
  text-decoration: none;
  line-height: 1;
}

.brand-mark {
  display: block;
  width: 1.15em;
  height: 1.15em;
  flex: 0 0 auto;
  background: currentColor;
  -webkit-mask: url("/assets/img/logo-mark.svg?v=5340c054d5") center / contain no-repeat;
  mask: url("/assets/img/logo-mark.svg?v=5340c054d5") center / contain no-repeat;
}

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

.nav {
  display: flex;
  flex-wrap: wrap;
  justify-content: flex-end;
  gap: 0.35rem 1.25rem;
  font-size: 0.92rem;
  letter-spacing: 0.06em;
}

.nav a {
  color: var(--ink-muted);
  text-decoration: none;
}

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

/* —— Hero: one composition —— */
.hero {
  min-height: min(92vh, 52rem);
  display: grid;
  align-content: center;
  padding: 5rem 0 4rem;
  animation: rise 0.9s var(--ease) both;
}

.hero-kicker {
  margin: 0 0 1.5rem;
  font-size: 0.8rem;
  letter-spacing: 0.28em;
  text-transform: uppercase;
  color: var(--ink-muted);
}

.hero-brand {
  margin: 0 0 1.75rem;
  font-family: var(--font-brand);
  font-size: clamp(3.4rem, 12vw, 6.5rem);
  letter-spacing: 0.2em;
  line-height: 1;
  font-weight: 400;
}

.hero h1 {
  margin: 0 0 1rem;
  max-width: 14em;
  font-family: var(--font-display);
  font-size: clamp(1.25rem, 2.8vw, 1.65rem);
  font-weight: 500;
  line-height: 1.55;
  letter-spacing: 0.04em;
}

.hero .lead {
  margin: 0 0 2rem;
  max-width: 28rem;
  color: var(--ink-muted);
  font-size: 1.02rem;
}

.cta-row {
  display: flex;
  flex-wrap: wrap;
  gap: 0.75rem;
}

.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-height: 2.85rem;
  padding: 0.55rem 1.35rem;
  border-radius: 0.15rem;
  border: 1px solid transparent;
  font: inherit;
  font-size: 0.95rem;
  letter-spacing: 0.08em;
  cursor: pointer;
  text-decoration: none;
  transition: background 0.2s var(--ease), color 0.2s var(--ease), transform 0.15s ease;
}

.btn:active {
  transform: translateY(1px);
}

.btn-primary {
  background: var(--cinnabar);
  color: #fff8f6;
}

.btn-primary:hover {
  background: var(--cinnabar-deep);
  color: #fff;
}

.btn-ghost {
  background: transparent;
  border-color: var(--line-strong);
  color: var(--ink);
}

.btn-ghost:hover {
  border-color: var(--ink);
  color: var(--ink);
}

/* —— Sections —— */
.section {
  padding: 4rem 0;
  animation: rise 0.8s var(--ease) both;
  animation-delay: 0.08s;
}

.section-label {
  margin: 0 0 0.75rem;
  font-size: 0.78rem;
  letter-spacing: 0.24em;
  color: var(--ink-muted);
}

.section h2 {
  margin: 0 0 0.5rem;
  font-family: var(--font-display);
  font-size: clamp(1.45rem, 3vw, 1.9rem);
  font-weight: 600;
  letter-spacing: 0.08em;
}

.section .sub {
  margin: 0 0 2.25rem;
  max-width: 28rem;
  color: var(--ink-muted);
}

.topic-list {
  display: grid;
  gap: 0;
  border-top: 1px solid var(--line-strong);
}

.topic {
  display: grid;
  grid-template-columns: 3.5rem 1fr auto;
  gap: 1rem;
  align-items: baseline;
  padding: 1.45rem 0;
  border-bottom: 1px solid var(--line);
  text-decoration: none;
  color: inherit;
  transition: padding-left 0.25s var(--ease);
}

.topic:hover {
  padding-left: 0.35rem;
  color: inherit;
}

.topic-num {
  font-family: var(--font-display);
  font-size: 0.95rem;
  letter-spacing: 0.12em;
  color: var(--seal);
}

.topic strong {
  display: block;
  font-family: var(--font-display);
  font-size: 1.25rem;
  font-weight: 600;
  letter-spacing: 0.06em;
  margin-bottom: 0.25rem;
}

.topic span {
  color: var(--ink-muted);
  font-size: 0.95rem;
}

.topic-go {
  color: var(--ink-muted);
  font-size: 0.85rem;
  letter-spacing: 0.12em;
}

.tool-strip {
  display: grid;
  grid-template-columns: 1fr;
  gap: 1.25rem;
  padding: 1.75rem 0;
  border-top: 1px solid var(--line-strong);
  border-bottom: 1px solid var(--line-strong);
}

@media (min-width: 720px) {
  .tool-strip {
    grid-template-columns: 1.4fr 1fr;
    align-items: end;
  }
}

.tool-strip h3 {
  margin: 0 0 0.4rem;
  font-family: var(--font-display);
  font-size: 1.35rem;
  letter-spacing: 0.08em;
}

.tool-strip p {
  margin: 0;
  color: var(--ink-muted);
}

.almanac-snippet {
  font-family: var(--font-display);
  font-size: 0.98rem;
  line-height: 1.8;
  color: var(--ink);
}

.almanac-snippet .muted {
  color: var(--ink-muted);
}

/* —— Page chrome —— */
.page-head {
  padding: 3rem 0 1.5rem;
  animation: rise 0.7s var(--ease) both;
}

.page-head h1 {
  margin: 0 0 0.65rem;
  font-family: var(--font-display);
  font-size: clamp(1.75rem, 4vw, 2.35rem);
  font-weight: 600;
  letter-spacing: 0.1em;
}

.page-head p {
  margin: 0;
  max-width: 32rem;
  color: var(--ink-muted);
}

.sheet {
  background: rgba(250, 249, 246, 0.72);
  border: 1px solid var(--line);
  border-radius: 0.1rem;
  padding: 1.75rem 1.5rem;
  box-shadow: 0 1px 0 rgba(255, 255, 255, 0.7) inset;
}

@media (min-width: 640px) {
  .sheet {
    padding: 2.25rem 2.1rem;
  }
}

.notice {
  margin: 1.25rem 0 0;
  padding-left: 0.85rem;
  border-left: 2px solid var(--line-strong);
  font-size: 0.88rem;
  color: var(--ink-muted);
}

.prose {
  max-width: var(--read);
}

.prose h2 {
  font-family: var(--font-display);
  letter-spacing: 0.06em;
  margin-top: 2.25rem;
}

.prose ul,
.prose ol {
  padding-left: 1.2rem;
}

/* —— Forms —— */
.form-grid {
  display: grid;
  gap: 1rem;
}

.form-grid label {
  display: grid;
  gap: 0.4rem;
  font-size: 0.9rem;
  letter-spacing: 0.04em;
  color: var(--ink-muted);
}

.form-grid label > span,
.form-grid .label-text {
  color: var(--ink-muted);
}

.form-grid input,
.form-grid select,
.form-grid textarea {
  font: inherit;
  color: var(--ink);
  padding: 0.7rem 0.8rem;
  border: 1px solid var(--line-strong);
  border-radius: 0.1rem;
  background: var(--wash);
}

.form-grid input:focus,
.form-grid select:focus,
.form-grid textarea:focus {
  outline: 2px solid rgba(180, 35, 24, 0.25);
  outline-offset: 1px;
}

.form-row {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(9rem, 1fr));
  gap: 0.85rem;
}

.check-line {
  display: flex !important;
  align-items: center;
  gap: 0.55rem;
  grid-template-columns: none !important;
}

/* —— Preview as booklet —— */
.book {
  margin-top: 1.5rem;
  animation: rise 0.75s var(--ease) both;
}

.book-cover {
  padding: 2rem 1.5rem 1.75rem;
  border: 1px solid var(--line-strong);
  background:
    linear-gradient(180deg, rgba(250, 249, 246, 0.95), rgba(231, 228, 220, 0.9));
  text-align: center;
}

.book-cover .seal {
  display: inline-block;
  margin-bottom: 1rem;
  padding: 0.2rem 0.55rem;
  border: 1px solid var(--cinnabar);
  color: var(--cinnabar);
  font-size: 0.75rem;
  letter-spacing: 0.2em;
}

.book-cover h2 {
  margin: 0 0 0.5rem;
  font-family: var(--font-brand);
  font-size: clamp(1.8rem, 5vw, 2.4rem);
  letter-spacing: 0.16em;
  font-weight: 400;
}

.book-cover .meta {
  color: var(--ink-muted);
  font-size: 0.92rem;
}

.pillars {
  display: grid;
  grid-template-columns: repeat(4, minmax(0, 1fr));
  gap: 0.45rem;
  margin: 1.5rem 0 0.5rem;
}

.pillar {
  text-align: center;
  padding: 0.85rem 0.35rem;
  border: 1px solid var(--line);
  background: var(--wash);
}

.pillar .name {
  font-size: 0.72rem;
  letter-spacing: 0.14em;
  color: var(--ink-muted);
}

.pillar .gz {
  margin-top: 0.35rem;
  font-family: var(--font-display);
  font-size: 1.35rem;
  letter-spacing: 0.1em;
}

.toc {
  list-style: none;
  margin: 0;
  padding: 0;
  counter-reset: toc;
}

.toc li {
  counter-increment: toc;
  display: grid;
  grid-template-columns: 2rem 1fr;
  gap: 0.75rem;
  padding: 0.85rem 0;
  border-bottom: 1px solid var(--line);
  font-family: var(--font-display);
  letter-spacing: 0.04em;
}

.toc li::before {
  content: counter(toc, decimal-leading-zero);
  color: var(--seal);
  font-size: 0.9rem;
}

.teaser-block {
  padding: 1.35rem 0;
  border-bottom: 1px dashed var(--line);
  animation: rise 0.6s var(--ease) both;
}

.teaser-block:nth-child(1) { animation-delay: 0.05s; }
.teaser-block:nth-child(2) { animation-delay: 0.1s; }
.teaser-block:nth-child(3) { animation-delay: 0.15s; }
.teaser-block:nth-child(4) { animation-delay: 0.2s; }
.teaser-block:nth-child(5) { animation-delay: 0.25s; }

.teaser-block h3 {
  margin: 0 0 0.45rem;
  font-family: var(--font-display);
  font-size: 1.12rem;
  letter-spacing: 0.06em;
}

.teaser-block p {
  margin: 0;
  color: var(--ink-muted);
}

.teaser-block .fade {
  opacity: 0.45;
}

.buy-box {
  margin-top: 2rem;
  padding: 1.75rem 1.5rem;
  border: 1px solid rgba(180, 35, 24, 0.28);
  background: linear-gradient(165deg, rgba(250, 249, 246, 0.95), rgba(180, 35, 24, 0.04));
}

.buy-box .price {
  margin: 0.35rem 0 0.75rem;
  font-family: var(--font-display);
  font-size: 2rem;
  letter-spacing: 0.04em;
  color: var(--cinnabar);
}

.buy-box .wechat {
  font-weight: 600;
  letter-spacing: 0.06em;
}

/* —— Almanac —— */
.almanac-grid {
  display: grid;
  gap: 0.85rem;
}

.almanac-meta {
  display: flex;
  flex-wrap: wrap;
  gap: 0.5rem 1rem;
  color: var(--ink-muted);
  font-size: 0.92rem;
}

.tag {
  display: inline-block;
  padding: 0.12rem 0.45rem;
  border: 1px solid var(--line-strong);
  font-size: 0.78rem;
  letter-spacing: 0.12em;
  color: var(--ink-muted);
}

/* —— Footer —— */
.site-footer {
  margin-top: 4rem;
  padding: 2.25rem 0 2.75rem;
  border-top: 1px solid var(--line);
  color: var(--ink-muted);
  font-size: 0.88rem;
}

.site-footer .links {
  display: flex;
  flex-wrap: wrap;
  gap: 0.65rem 1.15rem;
  margin-bottom: 0.85rem;
}

.site-footer .footer-legal {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  justify-content: center;
  gap: 0.35rem 0;
  margin: 0 0 0.75rem;
}

.site-footer .footer-legal a {
  padding: 0 0.85rem;
  letter-spacing: 0.06em;
}

.site-footer .footer-legal a + a {
  border-left: 1px solid var(--line);
}

.site-footer .footer-legal a[aria-current="page"] {
  color: var(--ink);
}

.site-footer .footer-copy {
  margin: 0;
  text-align: center;
  font-size: 0.82rem;
  letter-spacing: 0.08em;
}

.site-footer a {
  color: var(--ink-muted);
  text-decoration: none;
}

.site-footer a:hover {
  color: var(--ink);
}

.legal-note {
  margin: 2.5rem 0 0;
  font-size: 0.82rem;
  color: var(--ink-muted);
}

@keyframes rise {
  from {
    opacity: 0;
    transform: translateY(12px);
  }
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

@media (max-width: 640px) {
  .pillars {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }

  .topic {
    grid-template-columns: 2.5rem 1fr;
  }

  .topic-go {
    display: none;
  }

  .hero {
    min-height: auto;
    padding-top: 3.5rem;
  }
}

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

  .hero,
  .section,
  .page-head,
  .book,
  .teaser-block,
  .topic,
  .btn {
    animation: none !important;
    transition: none !important;
  }
}

/* 试看页：启封笺摘要 */
.seal-summary {
  margin-bottom: 1.25rem;
  padding: 1rem 1.15rem;
}

.seal-summary[hidden] {
  display: none !important;
}

.seal-summary-kicker {
  margin: 0 0 0.5rem;
  font-size: 0.78rem;
  letter-spacing: 0.08em;
  color: var(--ink-muted);
}

.seal-summary ul {
  margin: 0;
  padding-left: 1.1rem;
}

.seal-summary li {
  margin: 0.2rem 0;
}

/* 登录 / 注册样式见 auth.css */

.auth-nav-user {
  position: relative;
  display: inline-flex;
  align-items: center;
  font-size: 0.92rem;
  letter-spacing: 0.04em;
}

.auth-nav-trigger {
  display: inline-flex;
  align-items: center;
  gap: 0.35rem;
  color: var(--ink-muted);
  cursor: default;
}

.auth-nav-user:hover .auth-nav-trigger {
  color: var(--ink);
}

.auth-nav-caret {
  display: inline-block;
  width: 0.35rem;
  height: 0.35rem;
  margin-top: -0.15rem;
  border-right: 1px solid currentColor;
  border-bottom: 1px solid currentColor;
  transform: rotate(45deg);
  opacity: 0.7;
  transition: transform 0.2s var(--ease);
}

.auth-nav-user:hover .auth-nav-caret {
  margin-top: 0.1rem;
  transform: rotate(225deg);
}

/*
 * 悬停菜单：禁止 pointer-events:none / visibility:hidden。
 * 否则鼠标离开名字移向菜单时，父级立刻失去 :hover，菜单点不到。
 * 用 display 切换，菜单 top:100% 紧贴，视觉间距放在 padding-top。
 */
.auth-nav-menu {
  display: none;
  position: absolute;
  top: 100%;
  right: 0;
  z-index: 50;
  min-width: 7.5rem;
  padding-top: 0.4rem;
}

.auth-nav-user:hover .auth-nav-menu,
.auth-nav-user:focus-within .auth-nav-menu {
  display: block;
}

.auth-nav-menu-inner {
  padding: 0.35rem;
  border: 1px solid var(--line-strong);
  border-radius: 0.15rem;
  background: var(--wash);
  box-shadow: 0 10px 28px rgba(18, 20, 26, 0.12);
}

.auth-nav-item {
  display: block;
  width: 100%;
  margin: 0;
  padding: 0.55rem 0.75rem;
  border: none;
  border-radius: 0.1rem;
  background: transparent;
  color: var(--ink);
  font: inherit;
  font-size: 0.9rem;
  letter-spacing: 0.08em;
  text-align: left;
  text-decoration: none;
  cursor: pointer;
  box-sizing: border-box;
}

a.auth-nav-item:hover,
button.auth-nav-item:hover {
  background: rgba(18, 20, 26, 0.05);
  color: var(--cinnabar);
}

.auth-nav-member.is-active {
  color: var(--ink-muted);
  cursor: default;
}

.auth-nav-member.is-active:hover {
  background: transparent;
  color: var(--ink-muted);
}

.auth-nav-logout:hover {
  color: var(--cinnabar);
}