:root {
  --paper: #fbfaf7;
  --ink: #23262b;
  --ink-soft: #4d5259;
  --ink-mute: #767b83;
  --line: #e2e0d9;
  --line-strong: #cfccc2;
  --tacai: #2f7d7b;
  --tacai-dark: #245f5d;
  --tacai-soft: #e4efee;
  --status: #c4741f;
  --status-soft: #f7ecdf;
  --field-bg: #ecebe6;
  --radius: 6px;
  --radius-sm: 4px;
  --shadow: 0 1px 2px rgba(35, 38, 43, 0.06);
  --shadow-hover: 0 4px 12px rgba(35, 38, 43, 0.1);
  --container: 1140px;
  --gap: 24px;
  --font: "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", "Source Han Sans SC", "Noto Sans CJK SC", system-ui, -apple-system, sans-serif;
  --font-mono: "SF Mono", "Cascadia Mono", "Roboto Mono", Consolas, "Courier New", monospace;
}

/* ============================================================
   base
   ============================================================ */

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

html {
  -webkit-text-size-adjust: 100%;
  scroll-behavior: smooth;
  scroll-padding-top: 88px;
}

body {
  margin: 0;
  font-family: var(--font);
  font-size: 16px;
  line-height: 1.75;
  color: var(--ink);
  background: var(--paper);
  -webkit-font-smoothing: antialiased;
  text-rendering: optimizeLegibility;
}

h1, h2, h3, h4, h5, h6 {
  margin: 0;
  font-weight: 700;
  line-height: 1.35;
  color: var(--ink);
}

p {
  margin: 0;
}

ul, ol {
  margin: 0;
  padding: 0;
  list-style: none;
}

a {
  color: var(--tacai);
  text-decoration: none;
  transition: color 0.18s ease;
}

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

a:focus-visible {
  outline: 2px solid var(--tacai);
  outline-offset: 2px;
  border-radius: 2px;
}

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

figure {
  margin: 0;
}

table {
  border-collapse: collapse;
  width: 100%;
}

dt, dd {
  margin: 0;
}

button {
  font-family: inherit;
  cursor: pointer;
}

.skip-link {
  position: absolute;
  left: -9999px;
  top: 0;
  z-index: 200;
  padding: 10px 18px;
  background: var(--ink);
  color: #fff;
  border-radius: 0 0 var(--radius) 0;
}

.skip-link:focus {
  left: 0;
  color: #fff;
  text-decoration: none;
}

/* ============================================================
   layout
   ============================================================ */

.site-body {
  display: flex;
  flex-direction: column;
  min-height: 100vh;
  background: var(--paper);
}

.site-header {
  position: sticky;
  top: 0;
  z-index: 100;
  background: var(--paper);
  border-bottom: 1px solid var(--line);
}

.header-inner {
  max-width: var(--container);
  margin: 0 auto;
  padding: 0 24px;
  height: 64px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 24px;
}

.brand {
  font-size: 20px;
  font-weight: 700;
  color: var(--ink);
  letter-spacing: 0;
  white-space: nowrap;
  flex-shrink: 0;
}

.brand:hover {
  color: var(--tacai);
  text-decoration: none;
}

.site-nav {
  display: flex;
  align-items: center;
}

.nav-list {
  display: flex;
  align-items: center;
  gap: 4px;
}

.nav-list li {
  display: block;
}

.nav-list a {
  display: block;
  padding: 8px 14px;
  font-size: 15px;
  color: var(--ink-soft);
  border-radius: var(--radius-sm);
  border-bottom: 2px solid transparent;
  transition: color 0.18s ease, border-color 0.18s ease;
}

.nav-list a:hover {
  color: var(--tacai);
  text-decoration: none;
}

.nav-list a.is-current {
  color: var(--ink);
  font-weight: 700;
  border-bottom-color: var(--tacai);
}

.nav-toggle {
  display: none;
  width: 44px;
  height: 44px;
  padding: 0;
  background: transparent;
  border: 1px solid var(--line-strong);
  border-radius: var(--radius-sm);
  position: relative;
}

.nav-toggle::before {
  content: "";
  position: absolute;
  left: 50%;
  top: 50%;
  width: 20px;
  height: 2px;
  background: var(--ink);
  transform: translate(-50%, -50%);
  box-shadow: 0 -6px 0 var(--ink), 0 6px 0 var(--ink);
}

.site-main {
  flex: 1 1 auto;
  width: 100%;
  max-width: var(--container);
  margin: 0 auto;
  padding: 0 24px 56px;
}

.inner-main {
  padding-top: 20px;
}

.topbar {
  background: var(--tacai-soft);
  border-bottom: 1px solid var(--line);
}

.topbar-text {
  max-width: var(--container);
  margin: 0 auto;
  padding: 9px 24px;
  font-size: 13.5px;
  line-height: 1.6;
  color: var(--tacai-dark);
}

/* ============================================================
   components
   ============================================================ */

.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-height: 44px;
  padding: 10px 22px;
  font-size: 15px;
  font-weight: 600;
  border-radius: var(--radius);
  border: 1px solid transparent;
  transition: background-color 0.18s ease, color 0.18s ease, border-color 0.18s ease;
}

.btn:hover {
  text-decoration: none;
}

.btn-primary {
  background: var(--tacai);
  color: #fff;
}

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

.btn-ghost {
  background: transparent;
  color: var(--tacai);
  border-color: var(--tacai);
}

.btn-ghost:hover {
  background: var(--tacai-soft);
  color: var(--tacai-dark);
}

.section-title {
  font-size: 22px;
  color: var(--ink);
  position: relative;
  padding-left: 14px;
}

.section-title::before {
  content: "";
  position: absolute;
  left: 0;
  top: 0.22em;
  bottom: 0.22em;
  width: 4px;
  border-radius: 2px;
  background: var(--tacai);
}

.section-desc,
.section-lead {
  margin-top: 10px;
  font-size: 15px;
  color: var(--ink-soft);
  max-width: 760px;
}

.section-more,
.pair-more,
.guide-more {
  margin-top: 18px;
  font-size: 15px;
}

.link-more {
  font-weight: 600;
}

.link-more::after {
  content: " →";
  font-weight: 400;
}

.tag {
  display: inline-block;
  padding: 2px 9px;
  font-size: 12.5px;
  line-height: 1.6;
  border-radius: var(--radius-sm);
  white-space: nowrap;
}

.tag-tacai {
  background: var(--tacai-soft);
  color: var(--tacai-dark);
}

.tag-status {
  background: var(--status-soft);
  color: var(--status);
}

.breadcrumb {
  display: flex;
  align-items: center;
  flex-wrap: wrap;
  gap: 8px;
  font-size: 14px;
  color: var(--ink-mute);
  margin-bottom: 18px;
}

.breadcrumb a {
  color: var(--ink-mute);
}

.breadcrumb a:hover {
  color: var(--tacai);
}

.breadcrumb-sep {
  color: var(--line-strong);
}

.breadcrumb-current {
  color: var(--ink-soft);
}

.breadcrumb-list {
  display: flex;
  align-items: center;
  flex-wrap: wrap;
  gap: 8px;
}

.page-header {
  margin-bottom: 28px;
  padding-bottom: 22px;
  border-bottom: 1px solid var(--line);
}

.page-title {
  font-size: 30px;
  line-height: 1.3;
  color: var(--ink);
}

.page-description {
  margin-top: 12px;
  font-size: 16px;
  color: var(--ink-soft);
  max-width: 800px;
}

.page-note {
  margin-top: 10px;
  font-size: 14px;
  color: var(--ink-mute);
}

.page-anchors {
  margin-top: 18px;
}

.anchor-list {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
}

.anchor-list a {
  display: inline-block;
  padding: 6px 14px;
  font-size: 13.5px;
  background: var(--field-bg);
  color: var(--ink-soft);
  border-radius: 999px;
  transition: background-color 0.18s ease, color 0.18s ease;
}

.anchor-list a:hover {
  background: var(--tacai-soft);
  color: var(--tacai-dark);
  text-decoration: none;
}

.subsection-title {
  font-size: 17px;
  color: var(--ink);
  margin-bottom: 12px;
}

/* --- 表格通用 --- */

.tacai-table {
  margin-top: 20px;
  border: 1px solid var(--line);
  border-radius: var(--radius);
  overflow: hidden;
  background: #fff;
}

.tacai-row {
  display: grid;
  grid-template-columns: 1.1fr 1.6fr 1.5fr 1.4fr;
  gap: 0;
  border-bottom: 1px solid var(--line);
}

.tacai-row:last-child {
  border-bottom: none;
}

.tacai-row-head {
  background: var(--field-bg);
}

.tacai-row-head .tacai-cell {
  font-weight: 700;
  font-size: 14px;
  color: var(--ink);
}

.tacai-cell {
  padding: 13px 16px;
  font-size: 14.5px;
  color: var(--ink-soft);
  border-right: 1px solid var(--line);
  min-width: 0;
  overflow-wrap: break-word;
}

.tacai-cell:last-child {
  border-right: none;
}

.tacai-cell.tacai-name,
.tacai-cell.tacai-cell-name {
  font-weight: 700;
  color: var(--ink);
}

.field-table {
  margin-top: 20px;
  border: 1px solid var(--line);
  border-radius: var(--radius);
  overflow: hidden;
  background: #fff;
  font-size: 14.5px;
}

.field-caption {
  caption-side: top;
  text-align: left;
  padding: 12px 16px;
  font-size: 13.5px;
  color: var(--ink-mute);
  background: var(--field-bg);
  border-bottom: 1px solid var(--line);
}

.field-table th,
.field-table td {
  padding: 12px 16px;
  text-align: left;
  border-bottom: 1px solid var(--line);
  vertical-align: top;
}

.field-table thead th {
  background: var(--field-bg);
  font-size: 14px;
  color: var(--ink);
}

.field-table tbody th {
  width: 30%;
  font-weight: 700;
  color: var(--ink);
  background: #f7f6f2;
}

.field-table tbody tr:last-child th,
.field-table tbody tr:last-child td {
  border-bottom: none;
}

.field-name {
  font-weight: 700;
  color: var(--ink);
}

.field-value {
  color: var(--ink-soft);
}

.field-note {
  margin-top: 16px;
  padding: 16px 18px;
  background: var(--field-bg);
  border-radius: var(--radius);
  font-size: 14.5px;
  color: var(--ink-soft);
}

/* --- 图片容器 --- */

.hero-media,
.cover-media,
.tacai-figure,
.overview-figure,
.rank-figure,
.lead-figure {
  overflow: hidden;
  border-radius: var(--radius);
  background: var(--field-bg);
}

.hero-media img,
.cover-media img,
.tacai-figure img,
.overview-figure img,
.rank-figure img,
.lead-figure img {
  width: 100%;
  height: 100%;
  object-fit: cover;
}

figcaption {
  padding: 10px 14px;
  font-size: 13px;
  color: var(--ink-mute);
  background: #fff;
  border-top: 1px solid var(--line);
}

/* ============================================================
   pages — index
   ============================================================ */

.home-main {
  padding-top: 32px;
}

.hero {
  margin-bottom: 44px;
}

.hero-inner {
  display: grid;
  grid-template-columns: 1.35fr 1fr;
  gap: 36px;
  align-items: center;
}

.hero-title {
  font-size: 34px;
  line-height: 1.28;
  color: var(--ink);
}

.hero-text {
  margin-top: 16px;
  font-size: 16px;
  color: var(--ink-soft);
  max-width: 560px;
}

.hero-actions {
  margin-top: 24px;
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
}

.hero-media {
  aspect-ratio: 4 / 3;
  box-shadow: var(--shadow);
}

.hero-facts {
  margin-top: 32px;
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 1px;
  background: var(--line);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  overflow: hidden;
}

.fact-item {
  display: flex;
  flex-direction: column;
  gap: 4px;
  padding: 18px 20px;
  background: #fff;
}

.fact-value {
  font-family: var(--font-mono);
  font-size: 20px;
  font-weight: 700;
  color: var(--tacai-dark);
  letter-spacing: 0;
}

.fact-label {
  font-size: 13.5px;
  color: var(--ink-mute);
}

.hero-source {
  margin-top: 14px;
  font-size: 13px;
  color: var(--ink-mute);
}

.section {
  margin-bottom: 48px;
}

.section-head {
  margin-bottom: 22px;
}

.section-wall .cover-wall {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 20px;
}

.cover-card {
  display: flex;
  flex-direction: column;
  background: #fff;
  border: 1px solid var(--line);
  border-radius: var(--radius);
  overflow: hidden;
  transition: transform 0.18s ease, box-shadow 0.18s ease, border-color 0.18s ease;
}

.cover-card:hover {
  text-decoration: none;
  border-color: var(--tacai);
  box-shadow: var(--shadow-hover);
  transform: translateY(-2px);
}

.cover-media {
  aspect-ratio: 3 / 4;
  border-radius: 0;
}

.cover-title {
  padding: 12px 14px 4px;
  font-size: 15.5px;
  color: var(--ink);
}

.cover-tags {
  padding: 0 14px 14px;
  display: flex;
  flex-wrap: wrap;
  gap: 6px;
}

.section-pair .pair-layout {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: var(--gap);
  align-items: start;
}

.pair-col {
  background: #fff;
  border: 1px solid var(--line);
  border-radius: var(--radius);
  padding: 22px 22px 20px;
}

.pair-heading {
  font-size: 17px;
  color: var(--ink);
  padding-bottom: 10px;
  border-bottom: 1px solid var(--line);
}

.pair-desc {
  margin-top: 12px;
  font-size: 14px;
  color: var(--ink-mute);
}

.update-group {
  margin-top: 18px;
}

.update-month {
  font-size: 14px;
  color: var(--tacai-dark);
  padding: 4px 10px;
  background: var(--tacai-soft);
  border-radius: var(--radius-sm);
  display: inline-block;
}

.update-list {
  margin-top: 10px;
}

.update-item {
  display: grid;
  grid-template-columns: auto 1fr auto;
  gap: 10px;
  align-items: baseline;
  padding: 9px 0;
  border-bottom: 1px dashed var(--line);
  font-size: 14.5px;
}

.update-item:last-child {
  border-bottom: none;
}

.update-date {
  font-family: var(--font-mono);
  font-size: 13px;
  color: var(--ink-mute);
  white-space: nowrap;
}

.update-name {
  color: var(--ink);
  font-weight: 600;
  min-width: 0;
}

.update-tacai {
  font-size: 12.5px;
  color: var(--tacai-dark);
  background: var(--tacai-soft);
  padding: 1px 8px;
  border-radius: var(--radius-sm);
  white-space: nowrap;
}

.update-status {
  font-size: 12.5px;
  color: var(--status);
  background: var(--status-soft);
  padding: 1px 8px;
  border-radius: var(--radius-sm);
  white-space: nowrap;
}

.rank-list {
  margin-top: 16px;
}

.rank-item {
  padding: 14px 0;
  border-bottom: 1px dashed var(--line);
}

.rank-item:last-child {
  border-bottom: none;
}

.rank-name {
  font-size: 15px;
  color: var(--ink);
}

.rank-basis {
  margin-top: 6px;
  font-size: 13.5px;
  color: var(--ink-soft);
}

.rank-scope {
  margin-top: 4px;
  font-size: 13px;
  color: var(--ink-mute);
}

.guide-layout {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: var(--gap);
  align-items: start;
  margin-top: 22px;
}

.guide-col {
  background: #fff;
  border: 1px solid var(--line);
  border-radius: var(--radius);
  padding: 22px;
}

.guide-heading {
  font-size: 17px;
  color: var(--ink);
  padding-bottom: 10px;
  border-bottom: 1px solid var(--line);
}

.field-list {
  margin-top: 14px;
}

.field-row {
  display: grid;
  grid-template-columns: 110px 1fr;
  gap: 12px;
  padding: 10px 0;
  border-bottom: 1px dashed var(--line);
}

.field-row:last-child {
  border-bottom: none;
}

.field-row .field-name {
  font-size: 14px;
  color: var(--ink);
}

.field-row .field-value {
  font-size: 14px;
  color: var(--ink-soft);
}

.guide-text {
  margin-top: 14px;
  font-size: 14.5px;
  color: var(--ink-soft);
}

.path-list {
  margin-top: 14px;
  counter-reset: path;
}

.path-item {
  position: relative;
  padding: 10px 0 10px 34px;
  font-size: 14.5px;
  color: var(--ink-soft);
  border-bottom: 1px dashed var(--line);
  counter-increment: path;
}

.path-item:last-child {
  border-bottom: none;
}

.path-item::before {
  content: counter(path);
  position: absolute;
  left: 0;
  top: 12px;
  width: 22px;
  height: 22px;
  line-height: 22px;
  text-align: center;
  font-size: 12.5px;
  font-weight: 700;
  color: #fff;
  background: var(--tacai);
  border-radius: 50%;
}

.section-index .index-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 18px;
  margin-top: 22px;
}

.index-col {
  background: #fff;
  border: 1px solid var(--line);
  border-radius: var(--radius);
  padding: 18px;
}

.index-heading {
  font-size: 15.5px;
  color: var(--ink);
  padding-bottom: 10px;
  border-bottom: 1px solid var(--line);
}

.index-list {
  margin-top: 12px;
  display: flex;
  flex-direction: column;
  gap: 8px;
}

.index-list a {
  font-size: 14px;
  color: var(--ink-soft);
}

.index-list a:hover {
  color: var(--tacai);
}

/* ============================================================
   pages — inner shared
   ============================================================ */

.page-layout {
  display: block;
}

.content-main {
  min-width: 0;
}

.content-section,
.tacai-table-section,
.tacai-select-section,
.tacai-link-section,
.update-overview,
.update-months,
.update-fields,
.update-jump,
.rank-lists,
.rank-basis,
.rank-map,
.rank-next {
  margin-bottom: 44px;
}

.tacai-figure,
.overview-figure,
.rank-figure,
.lead-figure {
  margin-bottom: 28px;
  aspect-ratio: 16 / 7;
}

.tacai-figure img,
.overview-figure img,
.rank-figure img,
.lead-figure img {
  aspect-ratio: 16 / 7;
}

/* ============================================================
   pages — tacai
   ============================================================ */

.tacai-select-cols {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: var(--gap);
  margin-top: 20px;
  align-items: start;
}

.tacai-select-col {
  background: #fff;
  border: 1px solid var(--line);
  border-radius: var(--radius);
  padding: 20px 22px;
}

.step-list {
  counter-reset: step;
}

.step-item {
  position: relative;
  padding: 10px 0 10px 34px;
  font-size: 14.5px;
  color: var(--ink-soft);
  border-bottom: 1px dashed var(--line);
  counter-increment: step;
}

.step-item:last-child {
  border-bottom: none;
}

.step-item .step-index {
  position: absolute;
  left: 0;
  top: 12px;
  width: 22px;
  height: 22px;
  line-height: 22px;
  text-align: center;
  font-size: 12.5px;
  font-weight: 700;
  color: #fff;
  background: var(--tacai);
  border-radius: 50%;
}

.step-text {
  display: block;
}

.mistake-list {
  display: flex;
  flex-direction: column;
  gap: 10px;
}

.mistake-item {
  padding: 10px 14px;
  font-size: 14.5px;
  color: var(--ink-soft);
  background: var(--field-bg);
  border-radius: var(--radius-sm);
}

.tacai-link-cols {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: var(--gap);
  margin-top: 20px;
  align-items: start;
}

.tacai-link-col {
  background: #fff;
  border: 1px solid var(--line);
  border-radius: var(--radius);
  padding: 20px 22px;
  font-size: 14.5px;
  color: var(--ink-soft);
}

/* ============================================================
   pages — gengxin
   ============================================================ */

.month-group {
  margin-top: 24px;
  background: #fff;
  border: 1px solid var(--line);
  border-radius: var(--radius);
  overflow: hidden;
}

.month-heading {
  padding: 13px 20px;
  font-size: 16px;
  color: var(--ink);
  background: var(--field-bg);
  border-bottom: 1px solid var(--line);
}

.update-row {
  display: grid;
  grid-template-columns: 110px minmax(0, 1.6fr) minmax(0, 1fr) auto;
  gap: 14px;
  align-items: center;
  padding: 12px 20px;
  border-bottom: 1px solid var(--line);
  font-size: 14.5px;
}

.update-row:last-child {
  border-bottom: none;
}

.update-row .update-date {
  font-family: var(--font-mono);
  font-size: 13px;
  color: var(--ink-mute);
}

.update-row .update-name {
  font-weight: 600;
  color: var(--ink);
  min-width: 0;
  overflow-wrap: break-word;
}

.update-tag {
  font-size: 12.5px;
  color: var(--tacai-dark);
  background: var(--tacai-soft);
  padding: 2px 9px;
  border-radius: var(--radius-sm);
  white-space: nowrap;
  justify-self: start;
}

.update-row .update-status {
  font-size: 12.5px;
  padding: 2px 9px;
  border-radius: var(--radius-sm);
  white-space: nowrap;
  justify-self: end;
}

.update-status.is-new {
  color: var(--status);
  background: var(--status-soft);
}

.update-status.is-edit {
  color: var(--tacai-dark);
  background: var(--tacai-soft);
}

.update-status.is-progress {
  color: var(--ink-soft);
  background: var(--field-bg);
}

.jump-columns {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: var(--gap);
  margin-top: 20px;
  align-items: start;
}

.jump-col {
  background: #fff;
  border: 1px solid var(--line);
  border-radius: var(--radius);
  padding: 20px 22px;
}

.jump-heading {
  font-size: 16px;
  color: var(--ink);
  margin-bottom: 10px;
}

.jump-text {
  font-size: 14.5px;
  color: var(--ink-soft);
}

.jump-list {
  margin-top: 12px;
  display: flex;
  flex-direction: column;
  gap: 8px;
}

.jump-list a {
  font-size: 14.5px;
}

.jump-back {
  margin-top: 20px;
  display: flex;
  flex-wrap: wrap;
  gap: 10px 20px;
  font-size: 14.5px;
}

/* ============================================================
   pages — bangdan
   ============================================================ */

.rank-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: var(--gap);
  margin-top: 22px;
  align-items: start;
}

.rank-card {
  background: #fff;
  border: 1px solid var(--line);
  border-radius: var(--radius);
  padding: 20px 22px;
}

.rank-card .rank-name {
  font-size: 17px;
  color: var(--ink);
  padding-bottom: 12px;
  border-bottom: 2px solid var(--tacai);
  margin-bottom: 14px;
}

.rank-meta {
  display: grid;
  grid-template-columns: 68px 1fr;
  gap: 6px 12px;
  font-size: 13.5px;
}

.rank-meta dt {
  color: var(--ink-mute);
}

.rank-meta dd {
  color: var(--ink-soft);
}

.rank-sequence {
  margin-top: 16px;
  counter-reset: rank;
}

.rank-card .rank-item {
  display: grid;
  grid-template-columns: 26px minmax(0, 1fr) auto;
  gap: 10px;
  align-items: center;
  padding: 9px 0;
  border-bottom: 1px dashed var(--line);
  font-size: 14.5px;
}

.rank-card .rank-item:last-child {
  border-bottom: none;
}

.rank-pos {
  font-family: var(--font-mono);
  font-size: 13px;
  font-weight: 700;
  color: var(--tacai-dark);
  text-align: center;
}

.rank-title {
  color: var(--ink);
  min-width: 0;
  overflow-wrap: break-word;
}

.rank-tag {
  font-size: 12px;
  color: var(--ink-mute);
  background: var(--field-bg);
  padding: 1px 8px;
  border-radius: var(--radius-sm);
  white-space: nowrap;
}

.rank-note {
  margin-top: 14px;
  font-size: 13px;
  color: var(--ink-mute);
}

.basis-list {
  margin-top: 22px;
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: var(--gap);
  counter-reset: basis;
}

.basis-item {
  background: #fff;
  border: 1px solid var(--line);
  border-radius: var(--radius);
  padding: 20px 22px;
  counter-increment: basis;
}

.basis-title {
  font-size: 16px;
  color: var(--ink);
  padding-left: 30px;
  position: relative;
  margin-bottom: 10px;
}

.basis-title::before {
  content: counter(basis);
  position: absolute;
  left: 0;
  top: 1px;
  width: 22px;
  height: 22px;
  line-height: 22px;
  text-align: center;
  font-size: 12.5px;
  font-weight: 700;
  color: #fff;
  background: var(--tacai);
  border-radius: 50%;
}

.basis-item p {
  font-size: 14.5px;
  color: var(--ink-soft);
}

.basis-tip {
  margin-top: 24px;
  padding: 18px 22px;
  background: var(--tacai-soft);
  border-left: 4px solid var(--tacai);
  border-radius: var(--radius);
}

.basis-tip-title {
  font-size: 15.5px;
  color: var(--tacai-dark);
  margin-bottom: 8px;
}

.basis-tip p {
  font-size: 14.5px;
  color: var(--ink-soft);
}

.map-table {
  margin-top: 22px;
  border: 1px solid var(--line);
  border-radius: var(--radius);
  overflow: hidden;
  background: #fff;
  font-size: 14.5px;
}

.map-table caption {
  caption-side: top;
  text-align: left;
  padding: 12px 16px;
  font-size: 13.5px;
  color: var(--ink-mute);
  background: var(--field-bg);
  border-bottom: 1px solid var(--line);
}

.map-table th,
.map-table td {
  padding: 12px 16px;
  text-align: left;
  border-bottom: 1px solid var(--line);
  vertical-align: top;
}

.map-table thead th {
  background: var(--field-bg);
  font-size: 14px;
  color: var(--ink);
}

.map-table tbody th {
  font-weight: 700;
  color: var(--ink);
}

.map-table tbody tr:last-child th,
.map-table tbody tr:last-child td {
  border-bottom: none;
}

.map-note {
  margin-top: 16px;
  font-size: 14px;
  color: var(--ink-mute);
}

.next-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 18px;
  margin-top: 22px;
  align-items: start;
}

.next-col {
  background: #fff;
  border: 1px solid var(--line);
  border-radius: var(--radius);
  padding: 18px;
}

.next-title {
  font-size: 15.5px;
  color: var(--ink);
  margin-bottom: 10px;
}

.next-col p {
  font-size: 14px;
  color: var(--ink-soft);
}

/* ============================================================
   pages — shuoming
   ============================================================ */

.scope-columns {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: var(--gap);
  margin-top: 22px;
  align-items: start;
}

.scope-col {
  background: #fff;
  border: 1px solid var(--line);
  border-radius: var(--radius);
  padding: 20px 22px;
}

.scope-col-in {
  border-top: 3px solid var(--tacai);
}

.scope-col-out {
  border-top: 3px solid var(--status);
}

.scope-list {
  display: flex;
  flex-direction: column;
  gap: 10px;
}

.scope-list li {
  position: relative;
  padding-left: 20px;
  font-size: 14.5px;
  color: var(--ink-soft);
}

.scope-list li::before {
  content: "";
  position: absolute;
  left: 0;
  top: 0.62em;
  width: 6px;
  height: 6px;
  border-radius: 50%;
  background: var(--tacai);
}

.scope-col-out .scope-list li::before {
  background: var(--status);
}

.scope-tail {
  margin-top: 18px;
  font-size: 14.5px;
  color: var(--ink-soft);
}

.section-path .path-list {
  margin-top: 22px;
  counter-reset: none;
}

.path-step {
  position: relative;
  padding: 18px 20px 18px 62px;
  background: #fff;
  border: 1px solid var(--line);
  border-radius: var(--radius);
  margin-bottom: 14px;
}

.path-step:last-child {
  margin-bottom: 0;
}

.path-step .step-index {
  position: absolute;
  left: 18px;
  top: 18px;
  width: 30px;
  height: 30px;
  line-height: 30px;
  text-align: center;
  font-family: var(--font-mono);
  font-size: 14px;
  font-weight: 700;
  color: #fff;
  background: var(--tacai);
  border-radius: 50%;
}

.path-step .step-title {
  font-size: 16px;
  color: var(--ink);
  margin-bottom: 6px;
}

.path-step .step-action {
  font-size: 14.5px;
  color: var(--ink-soft);
}

.path-step .step-result {
  margin-top: 6px;
  font-size: 13.5px;
  color: var(--ink-mute);
}

.path-tail {
  margin-top: 18px;
  font-size: 14.5px;
  color: var(--ink-soft);
}

.faq-list {
  margin-top: 22px;
  display: flex;
  flex-direction: column;
  gap: 12px;
}

.faq-item {
  background: #fff;
  border: 1px solid var(--line);
  border-radius: var(--radius);
  overflow: hidden;
}

.faq-question {
  padding: 15px 20px;
  font-size: 15.5px;
  font-weight: 600;
  color: var(--ink);
  cursor: pointer;
  list-style: none;
  position: relative;
  padding-right: 48px;
}

.faq-question::-webkit-details-marker {
  display: none;
}

.faq-question::after {
  content: "+";
  position: absolute;
  right: 20px;
  top: 50%;
  transform: translateY(-50%);
  font-size: 20px;
  font-weight: 400;
  color: var(--tacai);
  line-height: 1;
}

.faq-item[open] .faq-question::after {
  content: "−";
}

.faq-question:hover {
  color: var(--tacai-dark);
}

.faq-answer {
  padding: 0 20px 16px;
  font-size: 14.5px;
  color: var(--ink-soft);
  border-top: 1px solid var(--line);
  padding-top: 14px;
}

.section-next .next-grid {
  grid-template-columns: repeat(4, 1fr);
}

.next-card {
  background: #fff;
  border: 1px solid var(--line);
  border-radius: var(--radius);
  padding: 18px;
  transition: border-color 0.18s ease, box-shadow 0.18s ease;
}

.next-card:hover {
  border-color: var(--tacai);
  box-shadow: var(--shadow-hover);
}

.next-card-title {
  font-size: 15.5px;
  margin-bottom: 8px;
}

.next-card-text {
  font-size: 14px;
  color: var(--ink-soft);
}

/* ============================================================
   pages — 404
   ============================================================ */

.error-main {
  padding-top: 40px;
  padding-bottom: 80px;
}

.error-panel {
  max-width: 640px;
  margin: 0 auto;
  text-align: center;
  padding: 40px 24px;
  background: #fff;
  border: 1px solid var(--line);
  border-radius: var(--radius);
}

.error-title {
  font-size: 28px;
  color: var(--ink);
}

.error-text {
  margin-top: 14px;
  font-size: 15.5px;
  color: var(--ink-soft);
}

.error-actions {
  margin-top: 24px;
}

.error-links {
  margin-top: 28px;
  display: flex;
  flex-wrap: wrap;
  justify-content: center;
  gap: 10px 20px;
  font-size: 14.5px;
}

/* ============================================================
   footer
   ============================================================ */

.site-footer {
  margin-top: 40px;
  background: #f3f2ed;
  border-top: 1px solid var(--line);
  color: var(--ink-soft);
}

.footer-inner {
  max-width: var(--container);
  margin: 0 auto;
  padding: 32px 24px 24px;
}

.footer-top {
  display: flex;
  flex-wrap: wrap;
  gap: 10px 16px;
  align-items: center;
  font-size: 14px;
  padding-bottom: 16px;
  border-bottom: 1px solid var(--line);
}

.footer-sep {
  color: var(--line-strong);
}

.footer-about {
  margin-top: 16px;
  font-size: 13.5px;
  color: var(--ink-mute);
  max-width: 760px;
}

.footer-groups {
  margin-top: 24px;
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: var(--gap);
}

.footer-heading {
  font-size: 14px;
  color: var(--ink);
  margin-bottom: 12px;
}

.footer-list {
  display: flex;
  flex-direction: column;
  gap: 8px;
}

.footer-list a {
  font-size: 13.5px;
  color: var(--ink-soft);
}

.footer-list a:hover {
  color: var(--tacai);
}

.footer-copy {
  margin-top: 28px;
  padding-top: 16px;
  border-top: 1px solid var(--line);
  font-size: 13px;
  color: var(--ink-mute);
}

/* ============================================================
   responsive
   ============================================================ */

@media (max-width: 960px) {
  .header-inner {
    padding: 0 18px;
  }

  .nav-toggle {
    display: block;
  }

  .site-nav {
    position: absolute;
    top: 100%;
    left: 0;
    right: 0;
    background: var(--paper);
    border-bottom: 1px solid var(--line);
    box-shadow: 0 6px 16px rgba(35, 38, 43, 0.08);
    padding: 8px 18px 16px;
  }

  .nav-list {
    display: none;
    flex-direction: column;
    align-items: stretch;
    gap: 2px;
  }

  .nav-list.is-open {
    display: flex;
  }

  .nav-list a {
    padding: 12px 14px;
    min-height: 44px;
    display: flex;
    align-items: center;
    border-bottom: none;
    border-left: 3px solid transparent;
  }

  .nav-list a.is-current {
    border-bottom-color: transparent;
    border-left-color: var(--tacai);
    background: var(--tacai-soft);
  }

  .site-main {
    padding: 0 18px 44px;
  }

  .inner-main {
    padding-top: 16px;
  }

  .topbar-text {
    padding: 8px 18px;
  }

  .hero-inner {
    grid-template-columns: 1fr;
    gap: 24px;
  }

  .hero-media {
    order: -1;
    aspect-ratio: 16 / 9;
  }

  .hero-title {
    font-size: 27px;
  }

  .section-wall .cover-wall {
    grid-template-columns: repeat(2, 1fr);
  }

  .section-pair .pair-layout,
  .guide-layout,
  .tacai-select-cols,
  .tacai-link-cols,
  .jump-columns,
  .scope-columns {
    grid-template-columns: 1fr;
  }

  .section-index .index-grid,
  .rank-grid,
  .basis-list,
  .next-grid,
  .section-next .next-grid {
    grid-template-columns: repeat(2, 1fr);
  }

  .footer-groups {
    grid-template-columns: repeat(2, 1fr);
  }
}

@media (max-width: 640px) {
  body {
    font-size: 15.5px;
  }

  .header-inner {
    height: 58px;
    padding: 0 14px;
  }

  .brand {
    font-size: 18px;
  }

  .site-main {
    padding: 0 14px 36px;
  }

  .topbar-text {
    padding: 8px 14px;
    font-size: 12.5px;
  }

  .home-main {
    padding-top: 22px;
  }

  .hero {
    margin-bottom: 32px;
  }

  .hero-title {
    font-size: 23px;
  }

  .hero-text {
    font-size: 15px;
  }

  .hero-actions {
    gap: 10px;
  }

  .hero-actions .btn {
    flex: 1 1 auto;
    min-width: 140px;
  }

  .hero-facts {
    grid-template-columns: 1fr;
  }

  .fact-item {
    padding: 14px 16px;
  }

  .section {
    margin-bottom: 36px;
  }

  .section-title {
    font-size: 19px;
  }

  .page-title {
    font-size: 23px;
  }

  .page-header {
    margin-bottom: 22px;
    padding-bottom: 18px;
  }

  .section-wall .cover-wall {
    grid-template-columns: 1fr;
    gap: 16px;
  }

  .cover-media {
    aspect-ratio: 16 / 9;
  }

  .pair-col,
  .guide-col,
  .tacai-select-col,
  .tacai-link-col,
  .jump-col,
  .rank-card,
  .basis-item,
  .scope-col,
  .next-col,
  .next-card {
    padding: 16px;
  }

  .section-index .index-grid,
  .rank-grid,
  .basis-list,
  .next-grid,
  .section-next .next-grid,
  .footer-groups {
    grid-template-columns: 1fr;
  }

  .field-row {
    grid-template-columns: 1fr;
    gap: 4px;
  }

  .tacai-table {
    border: none;
    background: transparent;
    overflow: visible;
  }

  .tacai-row {
    grid-template-columns: 1fr;
    border: 1px solid var(--line);
    border-radius: var(--radius);
    background: #fff;
    margin-bottom: 12px;
    overflow: hidden;
  }

  .tacai-row:last-child {
    margin-bottom: 0;
  }

  .tacai-row-head {
    display: none;
  }

  .tacai-cell {
    border-right: none;
    border-bottom: 1px solid var(--line);
    padding: 10px 14px;
    display: flex;
    flex-direction: column;
    gap: 2px;
  }

  .tacai-cell:last-child {
    border-bottom: none;
  }

  .tacai-cell::before {
    content: attr(data-label);
    font-size: 12px;
    color: var(--ink-mute);
    font-weight: 400;
  }

  .tacai-cell.tacai-name,
  .tacai-cell.tacai-cell-name {
    font-size: 16px;
    background: var(--field-bg);
  }

  .tacai-cell.tacai-name::before,
  .tacai-cell.tacai-cell-name::before {
    content: none;
  }

  .update-item {
    grid-template-columns: 1fr auto;
    gap: 6px 10px;
  }

  .update-item .update-date {
    grid-column: 1 / -1;
  }

  .update-row {
    grid-template-columns: 1fr;
    gap: 4px;
    padding: 12px 16px;
  }

  .update-row .update-status,
  .update-tag {
    justify-self: start;
  }

  .rank-card .rank-item {
    grid-template-columns: 24px minmax(0, 1fr);
  }

  .rank-card .rank-item .rank-tag {
    grid-column: 2 / 3;
    justify-self: start;
  }

  .field-table tbody th {
    width: 40%;
  }

  .field-table th,
  .field-table td,
  .map-table th,
  .map-table td {
    padding: 10px 12px;
    font-size: 14px;
  }

  .path-step {
    padding: 16px 16px 16px 56px;
  }

  .path-step .step-index {
    left: 14px;
    top: 16px;
    width: 28px;
    height: 28px;
    line-height: 28px;
  }

  .error-panel {
    padding: 28px 18px;
  }

  .error-title {
    font-size: 23px;
  }

  .footer-inner {
    padding: 24px 14px 20px;
  }

  .footer-groups {
    gap: 20px;
  }
}

@media (max-width: 390px) {
  .hero-title {
    font-size: 21px;
  }

  .page-title {
    font-size: 21px;
  }

  .hero-actions .btn {
    min-width: 0;
    width: 100%;
  }

  .anchor-list a {
    padding: 6px 12px;
  }
}

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

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