/* ==========================================================================
   亲戚计算器 · qinqijisuanqi.com
   设计基调：品牌绿 #0d966f、白底、直角、宽留白。
   间距只使用 0/4/8/12/16/24/32/40/48/64/80/96。
   ========================================================================== */

:root {
  --green: #0d966f;
  --green-dark: #087153;
  --bg: #ffffff;
  --ink: #202220;
  --inverse: #ffffff;
  --muted: #646b7a;
  --surface: #ebf3eb;
  --surface-2: #f6faf7;
  --line: #c8dbdd;
  --line-soft: #e6eeec;
  --focus: #00bbff;
  --visited: #0c646e;

  --radius: 0px;
  --radius-sm: 4px;
  --radius-md: 8px;

  --ease: cubic-bezier(0.215, 0.61, 0.355, 1);
  --fast: 0.2s;
  --base: 0.4s;

  --container: 1200px;
  --gutter: 24px;
  --section: 80px;

  --font: "Zen Kaku Gothic New", "PingFang SC", "Hiragino Sans GB",
    "Microsoft YaHei", "Source Han Sans SC", "Noto Sans CJK SC", sans-serif;
  --mono: "Inter", ui-monospace, "SF Mono", Menlo, Consolas, monospace;
}

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

html {
  -webkit-text-size-adjust: 100%;
  scroll-behavior: smooth;
  scroll-padding-top: 96px;
}

body {
  margin: 0;
  background: var(--bg);
  color: var(--ink);
  font-family: var(--font);
  font-size: 16px;
  font-weight: 500;
  line-height: 1.5;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

body.nav-open {
  overflow: hidden;
}

h1,
h2,
h3,
h4 {
  margin: 0;
  font-weight: 600;
  line-height: 1.2;
}

p {
  margin: 0 0 16px;
}

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

ul,
ol {
  margin: 0 0 16px;
  padding-left: 24px;
}

li {
  margin-bottom: 8px;
}

button {
  font: inherit;
  color: inherit;
}

img,
svg {
  max-width: 100%;
  vertical-align: middle;
}

::selection {
  background: var(--green);
  color: var(--inverse);
}

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

.skip-link {
  position: absolute;
  left: 16px;
  top: -9999px;
  z-index: 10000;
  background: var(--green);
  color: var(--inverse);
  padding: 12px 24px;
}

.skip-link:focus {
  top: 16px;
}

/* ---------- 基础版式 ---------- */

.container {
  width: 100%;
  max-width: var(--container);
  margin: 0 auto;
  padding: 0 var(--gutter);
}

.narrow {
  max-width: 800px;
}

.section {
  padding: var(--section) 0;
}

.section--tight {
  padding: 48px 0;
}

.section--tint {
  background: var(--surface-2);
}

.section + .section {
  border-top: 1px solid var(--line-soft);
}

.section-head {
  display: flex;
  align-items: flex-end;
  justify-content: space-between;
  gap: 32px;
  margin-bottom: 40px;
  flex-wrap: wrap;
}

.eyebrow {
  font-family: var(--mono);
  font-size: 12px;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: var(--green);
  margin: 0 0 12px;
}

.h2 {
  font-size: 24px;
  font-weight: 600;
  line-height: 1.3;
}

.h3 {
  font-size: 20px;
  font-weight: 500;
}

.lede {
  font-size: 17px;
  color: var(--ink);
  max-width: 46em;
}

.muted {
  color: var(--muted);
}

.small {
  font-size: 14px;
  line-height: 1.6;
}

.mono {
  font-family: var(--mono);
  font-variant-numeric: tabular-nums;
}

.prose {
  max-width: 40em;
}

.prose p {
  font-size: 16px;
  line-height: 1.9;
  margin-bottom: 24px;
}

.prose h2 {
  font-size: 24px;
  margin: 48px 0 16px;
}

.prose h3 {
  font-size: 20px;
  margin: 32px 0 12px;
}

.prose a,
.link {
  color: var(--green);
  text-decoration: underline;
  text-underline-offset: 3px;
  transition: opacity var(--fast) var(--ease);
}

.prose a:hover,
.link:hover {
  opacity: 0.7;
}

.prose ul,
.prose ol {
  font-size: 16px;
  line-height: 1.9;
}

.prose blockquote {
  margin: 32px 0;
  padding: 16px 24px;
  border-left: 3px solid var(--green);
  background: var(--surface-2);
  font-size: 16px;
  line-height: 1.9;
}

.prose blockquote p:last-child {
  margin-bottom: 0;
}

.rule {
  height: 1px;
  background: var(--line-soft);
  border: 0;
  margin: 0;
}

/* ---------- 按钮 ---------- */

.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-height: 48px;
  padding: 14px 24px;
  border-radius: var(--radius);
  border: 1px solid transparent;
  font-family: var(--font);
  font-size: 15px;
  font-weight: 500;
  line-height: 1.2;
  cursor: pointer;
  background: transparent;
  text-align: center;
  transition: background-color var(--fast) var(--ease),
    color var(--fast) var(--ease), border-color var(--fast) var(--ease),
    opacity var(--fast) var(--ease);
}

.btn--primary {
  background: var(--green);
  border-color: var(--green);
  color: var(--inverse);
}

.btn--primary:hover {
  background: var(--green-dark);
  border-color: var(--green-dark);
}

.btn--secondary {
  background: var(--bg);
  border-color: var(--green);
  color: var(--green);
}

.btn--secondary:hover {
  background: var(--green);
  color: var(--inverse);
}

.btn--ghost {
  background: transparent;
  border-color: transparent;
  color: var(--green);
  padding: 10px 0;
}

.btn--ghost:hover {
  opacity: 0.7;
}

.btn:disabled {
  opacity: 0.5;
  cursor: not-allowed;
}

.btn-group {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  align-items: center;
}

/* ---------- 顶部导航 ---------- */

.site-header {
  position: sticky;
  top: 0;
  z-index: 9999;
  background: rgba(255, 255, 255, 0.96);
  backdrop-filter: blur(8px);
  -webkit-backdrop-filter: blur(8px);
  border-bottom: 1px solid var(--line-soft);
}

.site-header__inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 24px;
  max-width: var(--container);
  margin: 0 auto;
  padding: 0 var(--gutter);
  height: 80px;
}

.brand {
  display: inline-flex;
  align-items: center;
  gap: 12px;
  flex: none;
}

.brand__mark {
  width: 32px;
  height: 32px;
  background: var(--green);
  color: var(--inverse);
  display: inline-flex;
  align-items: center;
  justify-content: center;
  font-size: 16px;
  font-weight: 700;
  line-height: 1;
}

.brand__text {
  font-size: 17px;
  font-weight: 600;
  letter-spacing: -0.01em;
}

.brand__sub {
  font-family: var(--mono);
  font-size: 11px;
  color: var(--muted);
  letter-spacing: 0.02em;
}

.nav {
  display: flex;
  align-items: center;
  gap: 24px;
}

.nav a {
  font-size: 14px;
  font-weight: 500;
  padding: 28px 0 25px;
  border-bottom: 2px solid transparent;
  white-space: nowrap;
  transition: opacity var(--fast) var(--ease),
    color var(--fast) var(--ease), border-color var(--fast) var(--ease);
}

.nav a:hover {
  opacity: 0.7;
}

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

.nav__cta {
  padding: 10px 16px !important;
  border-bottom: 0 !important;
  background: var(--green);
  color: var(--inverse) !important;
  min-height: 40px;
  display: inline-flex;
  align-items: center;
}

.nav__cta:hover {
  background: var(--green-dark);
  opacity: 1 !important;
}

.nav-toggle {
  display: none;
  width: 48px;
  height: 48px;
  border: 1px solid var(--line);
  border-radius: var(--radius);
  background: transparent;
  cursor: pointer;
  align-items: center;
  justify-content: center;
  padding: 0;
}

.nav-toggle__bars {
  position: relative;
  width: 18px;
  height: 12px;
  display: block;
}

.nav-toggle__bars::before,
.nav-toggle__bars::after {
  content: "";
  position: absolute;
  left: 0;
  width: 18px;
  height: 2px;
  background: var(--ink);
  transition: transform var(--fast) var(--ease), top var(--fast) var(--ease);
}

.nav-toggle__bars::before {
  top: 0;
}

.nav-toggle__bars::after {
  top: 10px;
}

.nav-toggle[aria-expanded="true"] .nav-toggle__bars::before {
  top: 5px;
  transform: rotate(45deg);
}

.nav-toggle[aria-expanded="true"] .nav-toggle__bars::after {
  top: 5px;
  transform: rotate(-45deg);
}

.mobile-nav {
  display: none;
}

/* ---------- 首页 Hero ---------- */

.hero {
  position: relative;
  padding: 80px 0 64px;
  background-color: var(--bg);
  background-image: repeating-linear-gradient(
      45deg,
      rgba(13, 150, 111, 0.045) 0,
      rgba(13, 150, 111, 0.045) 1px,
      transparent 1px,
      transparent 18px
    ),
    radial-gradient(circle at 88% 8%, rgba(13, 150, 111, 0.1), transparent 42%);
  border-bottom: 1px solid var(--line-soft);
}

.hero__inner {
  max-width: var(--container);
  margin: 0 auto;
  padding: 0 var(--gutter);
}

.hero h1 {
  font-size: clamp(44px, 7.4vw, 89px);
  font-weight: 700;
  line-height: 1.08;
  letter-spacing: -0.02em;
  margin-bottom: 24px;
  color: var(--ink);
}

.hero h1 span {
  color: var(--green);
}

.hero__lede {
  font-size: 18px;
  line-height: 1.7;
  max-width: 42em;
  margin-bottom: 40px;
  color: var(--ink);
}

.hero__meta {
  display: flex;
  flex-wrap: wrap;
  gap: 8px 24px;
  margin-top: 24px;
  font-size: 13px;
  color: var(--muted);
}

.hero__meta span::before {
  content: "";
  display: inline-block;
  width: 6px;
  height: 6px;
  margin-right: 8px;
  background: var(--green);
  vertical-align: 1px;
}

/* ---------- 计算器 ---------- */

.calc {
  background: var(--bg);
  border: 1px solid var(--line);
  padding: 32px;
  margin-top: 8px;
}

.calc__head {
  display: flex;
  align-items: baseline;
  justify-content: space-between;
  gap: 16px;
  margin-bottom: 16px;
  flex-wrap: wrap;
}

.calc__label {
  font-size: 13px;
  letter-spacing: 0.04em;
  color: var(--muted);
}

.calc__gender {
  display: inline-flex;
  border: 1px solid var(--line);
}

.calc__gender button {
  border: 0;
  background: transparent;
  font-size: 13px;
  padding: 8px 14px;
  cursor: pointer;
  min-height: 36px;
  transition: background-color var(--fast) var(--ease),
    color var(--fast) var(--ease);
}

.calc__gender button + button {
  border-left: 1px solid var(--line);
}

.calc__gender button[aria-pressed="true"] {
  background: var(--green);
  color: var(--inverse);
}

.path {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 8px;
  min-height: 48px;
  padding: 12px;
  border: 1px solid var(--line-soft);
  background: var(--surface-2);
  margin-bottom: 24px;
}

.path__empty {
  font-size: 14px;
  color: var(--muted);
}

.path__chip {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 6px 8px 6px 12px;
  background: var(--bg);
  border: 1px solid var(--line);
  font-size: 14px;
  color: var(--ink);
}

.path__chip button {
  border: 0;
  background: transparent;
  color: var(--muted);
  cursor: pointer;
  font-size: 16px;
  line-height: 1;
  padding: 2px 4px;
}

.path__chip button:hover {
  color: var(--green);
}

.step-groups {
  display: grid;
  grid-template-columns: repeat(4, minmax(0, 1fr));
  gap: 16px;
  margin-bottom: 24px;
}

.step-group__title {
  font-size: 12px;
  letter-spacing: 0.08em;
  color: var(--muted);
  margin-bottom: 8px;
}

.step-btns {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
}

.step-btn {
  min-height: 48px;
  padding: 10px 12px;
  background: var(--bg);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  font-size: 15px;
  cursor: pointer;
  transition: background-color var(--fast) var(--ease),
    color var(--fast) var(--ease), border-color var(--fast) var(--ease);
}

.step-btn:hover {
  background: var(--green);
  border-color: var(--green);
  color: var(--inverse);
}

.calc__foot {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  justify-content: space-between;
  gap: 16px;
  border-top: 1px solid var(--line-soft);
  padding-top: 24px;
}

.calc__hint {
  font-size: 13px;
  color: var(--muted);
  margin: 0;
  max-width: 40em;
}

/* 关系链下方的精简结果 */

.mini {
  display: flex;
  flex-wrap: wrap;
  align-items: baseline;
  gap: 8px 20px;
  padding: 12px 16px;
  margin: 0 0 16px;
  background: var(--surface);
  border-left: 4px solid var(--green);
  animation: mini-in var(--fast) var(--ease) both;
}

@keyframes mini-in {
  from {
    opacity: 0;
    transform: translateY(-4px);
  }
  to {
    opacity: 1;
    transform: none;
  }
}

.mini__label {
  font-family: var(--mono);
  font-size: 12px;
  letter-spacing: 0.08em;
  color: var(--muted);
}

.mini__term {
  font-size: 28px;
  font-weight: 700;
  line-height: 1.2;
  color: var(--green);
}

.mini__alt {
  font-size: 13px;
  color: var(--muted);
}

.mini__fact {
  font-size: 14px;
  color: var(--ink);
}

.mini__fact b {
  font-weight: 600;
}

.mini__more {
  margin-left: auto;
  font-size: 13px;
  color: var(--green);
  text-decoration: underline;
  text-underline-offset: 3px;
}

.mini__more:hover {
  opacity: 0.7;
}

.mini--error {
  background: #fdf3f2;
  border-left-color: #b23a2c;
  color: #8a2a20;
  font-size: 14px;
}

@media (max-width: 900px) {
  .mini {
    padding: 12px;
    gap: 6px 16px;
  }

  .mini__term {
    font-size: 26px;
  }

  .mini__more {
    margin-left: 0;
  }
}

/* ---------- 结果 ---------- */

.result {
  margin-top: 24px;
  border: 1px solid var(--line);
  background: var(--surface-2);
}

.result__main {
  padding: 32px;
  display: grid;
  grid-template-columns: minmax(0, 1.1fr) minmax(0, 1fr);
  gap: 32px;
  align-items: start;
}

.result__kicker {
  font-family: var(--mono);
  font-size: 12px;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: var(--green);
  margin-bottom: 12px;
}

.result__term {
  font-size: clamp(40px, 6vw, 64px);
  font-weight: 700;
  line-height: 1.1;
  color: var(--green);
  margin-bottom: 12px;
  word-break: break-all;
}

.result__alt {
  font-size: 15px;
  color: var(--muted);
  margin-bottom: 16px;
}

.result__chain {
  display: inline-block;
  font-size: 14px;
  color: var(--ink);
  background: var(--bg);
  border: 1px solid var(--line);
  padding: 8px 12px;
  margin: 0;
}

.result__facts {
  margin: 0;
  border-top: 1px solid var(--line);
}

.result__facts div {
  display: grid;
  grid-template-columns: 96px minmax(0, 1fr);
  gap: 16px;
  padding: 12px 0;
  border-bottom: 1px solid var(--line-soft);
}

.result__facts dt {
  font-size: 13px;
  color: var(--muted);
}

.result__facts dd {
  margin: 0;
  font-size: 15px;
  line-height: 1.6;
}

.result__note {
  padding: 0 32px 32px;
  font-size: 15px;
  line-height: 1.8;
  color: var(--ink);
  max-width: 60em;
}

.result__note p:last-child {
  margin-bottom: 0;
}

.result__empty {
  padding: 32px;
  font-size: 15px;
  color: var(--muted);
}

.result__actions {
  padding: 16px 32px;
  border-top: 1px solid var(--line-soft);
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  align-items: center;
  justify-content: space-between;
}

.result__actions .small {
  margin: 0;
}

/* ---------- 快捷关系 ---------- */

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

.quick a,
.quick button {
  border: 1px solid var(--line);
  background: var(--bg);
  color: var(--ink);
  padding: 8px 12px;
  font-size: 14px;
  cursor: pointer;
  transition: background-color var(--fast) var(--ease),
    color var(--fast) var(--ease), border-color var(--fast) var(--ease);
}

.quick a:hover,
.quick button:hover {
  background: var(--green);
  border-color: var(--green);
  color: var(--inverse);
}

/* ---------- 卡片 ---------- */

.cards {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 24px;
}

.card {
  background: var(--bg);
  border: 1px solid var(--line-soft);
  padding: 24px;
  transition: box-shadow var(--base) var(--ease),
    border-color var(--fast) var(--ease);
}

.card:hover {
  border-color: var(--line);
  box-shadow: 0 4px 12px rgba(0, 0, 0, 0.08);
}

.card__no {
  font-family: var(--mono);
  font-size: 12px;
  color: var(--green);
  margin-bottom: 16px;
}

.card h3 {
  font-size: 20px;
  margin-bottom: 8px;
}

.card p {
  font-size: 14px;
  line-height: 1.7;
  color: var(--muted);
  margin: 0;
}

.cards--two {
  grid-template-columns: repeat(2, minmax(0, 1fr));
}

/* ---------- 数据表 ---------- */

.table-wrap {
  overflow-x: auto;
  border-top: 1px solid var(--line);
}

table.data {
  width: 100%;
  border-collapse: collapse;
  font-size: 15px;
  min-width: 560px;
}

table.data th,
table.data td {
  text-align: left;
  padding: 14px 16px 14px 0;
  border-bottom: 1px solid var(--line-soft);
  vertical-align: top;
  line-height: 1.6;
}

table.data th {
  font-size: 12px;
  letter-spacing: 0.06em;
  color: var(--muted);
  font-weight: 500;
  white-space: nowrap;
}

table.data td:first-child {
  font-weight: 600;
  color: var(--ink);
  white-space: nowrap;
}

table.data tr:hover td {
  background: var(--surface-2);
}

/* ---------- 称呼大全筛选 ---------- */

.filter {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  margin-bottom: 24px;
}

.filter button {
  border: 1px solid var(--line);
  background: var(--bg);
  padding: 8px 14px;
  font-size: 14px;
  cursor: pointer;
  transition: background-color var(--fast) var(--ease),
    color var(--fast) var(--ease), border-color var(--fast) var(--ease);
}

.filter button[aria-pressed="true"],
.filter button:hover {
  background: var(--green);
  border-color: var(--green);
  color: var(--inverse);
}

.search {
  display: flex;
  gap: 8px;
  margin-bottom: 24px;
  max-width: 480px;
}

.search input {
  flex: 1;
  min-height: 48px;
  padding: 12px 16px;
  border: 1px solid var(--line);
  border-radius: var(--radius);
  font: inherit;
  font-size: 16px;
  background: var(--bg);
  color: var(--ink);
}

.search input:focus {
  outline: 3px solid var(--focus);
  outline-offset: 3px;
  border-color: var(--focus);
}

.term-list {
  list-style: none;
  padding: 0;
  margin: 0;
  border-top: 1px solid var(--line);
}

.term-list li {
  margin: 0;
  border-bottom: 1px solid var(--line-soft);
}

.term-list button {
  width: 100%;
  display: grid;
  grid-template-columns: 140px minmax(0, 1fr) 120px;
  gap: 24px;
  align-items: baseline;
  padding: 16px 0;
  border: 0;
  background: transparent;
  text-align: left;
  cursor: pointer;
  font: inherit;
}

.term-list button:hover {
  background: var(--surface-2);
}

.term-list .t {
  font-size: 18px;
  font-weight: 600;
  color: var(--ink);
}

.term-list .a {
  font-size: 13px;
  color: var(--muted);
  text-align: right;
}

.term-list .c {
  font-size: 14px;
  color: var(--ink);
}

.term-list .c span {
  display: -webkit-box;
  -webkit-line-clamp: 2;
  -webkit-box-orient: vertical;
  overflow: hidden;
  color: var(--muted);
  font-size: 13px;
  margin-top: 4px;
}

/* ---------- 关系图 ---------- */

.chart {
  border: 1px solid var(--line-soft);
  background: var(--bg);
  padding: 24px;
  overflow-x: auto;
}

.chart svg {
  display: block;
  width: 100%;
  min-width: 760px;
  height: auto;
}

.chart text {
  font-family: var(--font);
  font-weight: 500;
}

.chart .node-box {
  fill: #ffffff;
  stroke: #c8dbdd;
  stroke-width: 1.5;
  transition: fill 0.2s var(--ease);
  cursor: pointer;
}

.chart .node-box:hover {
  fill: #ebf3eb;
}

.chart .node-box--me {
  fill: #0d966f;
  stroke: #0d966f;
}

.chart .node-label {
  font-size: 15px;
  fill: #202220;
  pointer-events: none;
}

.chart .node-label--inverse {
  fill: #ffffff;
}

.chart .link-line {
  stroke: #c8dbdd;
  stroke-width: 1.5;
  fill: none;
}

.chart .link-line--dash {
  stroke-dasharray: 5 5;
}

.chart__caption {
  font-size: 13px;
  color: var(--muted);
  margin: 16px 0 0;
}

.legend {
  display: flex;
  flex-wrap: wrap;
  gap: 16px;
  margin-top: 16px;
  font-size: 13px;
  color: var(--muted);
}

.legend .lg-green::before {
  content: "";
  display: inline-block;
  width: 12px;
  height: 12px;
  margin-right: 6px;
  background: var(--green);
  border: 1px solid var(--green);
  vertical-align: -2px;
}

/* ---------- 祖宗十八代 ---------- */

.generations {
  display: grid;
  grid-template-columns: 1fr 120px 1fr;
  gap: 0;
  border-top: 1px solid var(--line);
}

.gen-col {
  padding: 0;
  margin: 0;
  list-style: none;
}

.gen-col li {
  margin: 0;
  border-bottom: 1px solid var(--line-soft);
}

.gen-item {
  display: flex;
  gap: 16px;
  align-items: baseline;
  padding: 12px 0;
}

.gen-item__no {
  font-family: var(--mono);
  font-size: 11px;
  letter-spacing: 0.02em;
  color: var(--muted);
  width: 56px;
  flex: none;
  white-space: nowrap;
  padding-top: 4px;
}

.gen-item__name {
  font-size: 18px;
  font-weight: 600;
  width: 4.5em;
  flex: none;
}

.gen-item__desc {
  font-size: 14px;
  color: var(--muted);
  line-height: 1.6;
}

.gen-axis {
  border-left: 1px solid var(--line-soft);
  border-right: 1px solid var(--line-soft);
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  background: var(--surface-2);
  padding: 24px 8px;
}

.gen-axis__line {
  width: 1px;
  flex: 1;
  background: var(--line);
}

.gen-axis__label {
  writing-mode: vertical-rl;
  font-size: 12px;
  letter-spacing: 0.2em;
  color: var(--muted);
  padding: 16px 0;
}

.gen-self {
  background: var(--green);
  color: var(--inverse);
  text-align: center;
  padding: 12px;
  font-size: 18px;
  font-weight: 600;
}

/* ---------- 文章 ---------- */

.article-head {
  padding: 64px 0 32px;
}

.article-head h1 {
  font-size: clamp(30px, 4.4vw, 40px);
  font-weight: 700;
  line-height: 1.25;
  margin-bottom: 16px;
  max-width: 24em;
}

.article-body {
  padding: 0 0 64px;
}

.article-foot {
  border-top: 1px solid var(--line-soft);
  padding: 32px 0;
  display: flex;
  flex-wrap: wrap;
  gap: 24px;
  justify-content: space-between;
  align-items: center;
}

.breadcrumb {
  font-size: 13px;
  color: var(--muted);
  margin-bottom: 32px;
}

.breadcrumb ol {
  list-style: none;
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  margin: 0;
  padding: 0;
}

.breadcrumb li {
  margin: 0;
  display: inline-flex;
  gap: 8px;
}

.breadcrumb li:not(:last-child)::after {
  content: "/";
  color: var(--line);
}

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

.article-list {
  list-style: none;
  padding: 0;
  margin: 0;
  border-top: 1px solid var(--line);
}

.article-list li {
  margin: 0;
  border-bottom: 1px solid var(--line-soft);
}

.article-list a {
  display: grid;
  grid-template-columns: 48px minmax(0, 1fr) 100px;
  gap: 24px;
  padding: 24px 0;
  align-items: baseline;
  transition: background-color var(--fast) var(--ease);
}

.article-list a:hover {
  background: var(--surface-2);
}

.article-list .no {
  font-family: var(--mono);
  font-size: 12px;
  color: var(--muted);
}

.article-list .t {
  font-size: 18px;
  font-weight: 600;
}

.article-list .t span {
  display: block;
  font-size: 14px;
  color: var(--muted);
  font-weight: 500;
  margin-top: 4px;
  line-height: 1.6;
}

.article-list .d {
  font-family: var(--mono);
  font-size: 12px;
  color: var(--muted);
  text-align: right;
}

/* ---------- 页脚 ---------- */

.site-footer {
  border-top: 1px solid var(--line-soft);
  padding: 64px 0 40px;
  background: var(--bg);
}

.footer__top {
  display: grid;
  grid-template-columns: minmax(0, 1.4fr) repeat(3, minmax(0, 1fr));
  gap: 32px;
  padding-bottom: 40px;
  border-bottom: 1px solid var(--line-soft);
}

.footer__brand p {
  font-size: 14px;
  line-height: 1.7;
  color: var(--muted);
  max-width: 26em;
  margin: 16px 0 0;
}

.footer__col h2 {
  font-family: var(--mono);
  font-size: 12px;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: var(--muted);
  margin-bottom: 16px;
  font-weight: 500;
}

.footer__col ul {
  list-style: none;
  padding: 0;
  margin: 0;
}

.footer__col li {
  margin-bottom: 10px;
}

.footer__col a {
  font-size: 14px;
  color: var(--ink);
  transition: color var(--fast) var(--ease);
}

.footer__col a:hover {
  color: var(--green);
}

.footer__bottom {
  display: flex;
  flex-wrap: wrap;
  gap: 8px 24px;
  justify-content: space-between;
  padding-top: 24px;
  font-size: 12px;
  color: var(--muted);
  font-family: var(--mono);
}

.footer__bottom p {
  margin: 0;
}

/* ---------- CTA ---------- */

.cta-band {
  background: var(--green);
  color: var(--inverse);
  padding: 64px 0;
}

.cta-band__inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 32px;
  flex-wrap: wrap;
}

.cta-band h2 {
  font-size: 28px;
  font-weight: 600;
  color: var(--inverse);
  margin-bottom: 8px;
}

.cta-band p {
  margin: 0;
  color: rgba(255, 255, 255, 0.82);
  font-size: 15px;
}

.cta-band .btn {
  background: var(--inverse);
  color: var(--green);
  border-color: var(--inverse);
  flex: none;
}

.cta-band .btn:hover {
  background: var(--surface);
  border-color: var(--surface);
}

/* ---------- 404 ---------- */

.notfound {
  padding: 96px 0;
}

.notfound__code {
  font-family: var(--mono);
  font-size: 96px;
  font-weight: 700;
  line-height: 1;
  color: var(--green);
  margin-bottom: 24px;
}

/* ---------- 响应式 ---------- */

@media (max-width: 1080px) {
  .step-groups {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }

  .cards {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }

  .result__main {
    grid-template-columns: minmax(0, 1fr);
  }

  .footer__top {
    grid-template-columns: minmax(0, 1fr) minmax(0, 1fr);
  }

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

@media (max-width: 900px) {
  :root {
    --section: 48px;
    --gutter: 16px;
  }

  .site-header__inner {
    height: 64px;
  }

  .nav {
    display: none;
  }

  .nav-toggle {
    display: inline-flex;
  }

  .mobile-nav {
    display: block;
    position: fixed;
    inset: 0;
    z-index: 10000;
    background: var(--bg);
    padding: 16px var(--gutter) 40px;
    transform: translateY(-8px);
    opacity: 0;
    visibility: hidden;
    transition: opacity var(--fast) var(--ease),
      transform var(--fast) var(--ease), visibility var(--fast) var(--ease);
    overflow-y: auto;
  }

  .mobile-nav.is-open {
    opacity: 1;
    visibility: visible;
    transform: none;
  }

  .mobile-nav__head {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding-bottom: 16px;
    border-bottom: 1px solid var(--line);
    margin-bottom: 16px;
  }

  .mobile-nav ul {
    list-style: none;
    margin: 0;
    padding: 0;
  }

  .mobile-nav li {
    margin: 0;
    border-bottom: 1px solid var(--line-soft);
  }

  .mobile-nav a {
    display: block;
    padding: 16px 0;
    font-size: 18px;
  }

  .hero {
    padding: 48px 0 40px;
  }

  .hero__lede {
    font-size: 16px;
  }

  .calc {
    padding: 16px;
  }

  .calc__head {
    align-items: center;
  }

  .step-groups {
    grid-template-columns: minmax(0, 1fr);
    gap: 16px;
  }

  .step-btns {
    gap: 8px;
  }

  .step-btn {
    flex: 1 1 calc(50% - 8px);
    min-height: 48px;
  }

  .result__main,
  .result__note,
  .result__actions {
    padding-left: 16px;
    padding-right: 16px;
  }

  .result__main {
    gap: 24px;
    padding-top: 24px;
  }

  .result__facts div {
    grid-template-columns: 80px minmax(0, 1fr);
  }

  .cards,
  .cards--two {
    grid-template-columns: minmax(0, 1fr);
  }

  .section-head {
    gap: 16px;
    margin-bottom: 24px;
  }

  .term-list button {
    grid-template-columns: minmax(0, 1fr) auto;
    gap: 8px;
  }

  .term-list .t {
    font-size: 16px;
  }

  .term-list .a {
    text-align: right;
  }

  .term-list .c {
    grid-column: 1 / -1;
    font-size: 13px;
  }

  .generations {
    grid-template-columns: minmax(0, 1fr);
  }

  .gen-axis {
    display: none;
  }

  .gen-item {
    flex-wrap: wrap;
    gap: 4px 12px;
  }

  .gen-item__desc {
    width: 100%;
    padding-left: 40px;
  }

  .footer__top {
    grid-template-columns: minmax(0, 1fr);
  }

  .article-list a {
    grid-template-columns: 32px minmax(0, 1fr);
  }

  .article-list .d {
    display: none;
  }

  .cta-band {
    padding: 40px 0;
  }

  .cta-band h2 {
    font-size: 22px;
  }
}

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

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

/* ---------- 补充组件 ---------- */

.card {
  display: block;
}

.term-list a {
  width: 100%;
  display: grid;
  grid-template-columns: 140px minmax(0, 1fr) 120px;
  gap: 24px;
  align-items: baseline;
  padding: 16px 0;
  text-align: left;
  color: inherit;
  text-decoration: none;
  transition: background-color var(--fast) var(--ease);
}

.term-list a:hover {
  background: var(--surface-2);
}

.term-list .t {
  font-size: 18px;
  font-weight: 600;
  color: var(--ink);
}

.term-list .c {
  font-size: 14px;
  color: var(--ink);
  line-height: 1.6;
}

.term-list .c span {
  display: -webkit-box;
  -webkit-line-clamp: 2;
  -webkit-box-orient: vertical;
  overflow: hidden;
  color: var(--muted);
  font-size: 13px;
  margin-top: 4px;
}

.term-list .a {
  font-size: 13px;
  color: var(--muted);
  text-align: right;
}

.faq-list {
  border-top: 1px solid var(--line);
}

.faq-list details {
  border-bottom: 1px solid var(--line-soft);
}

.faq-list summary {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 24px;
  padding: 16px 0;
  font-size: 17px;
  font-weight: 600;
  cursor: pointer;
  list-style: none;
}

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

.faq-list summary::after {
  content: "+";
  font-size: 22px;
  font-weight: 400;
  color: var(--green);
  line-height: 1;
  flex: none;
}

.faq-list details[open] summary::after {
  content: "−";
}

.faq-list p {
  margin: 0 0 16px;
  max-width: 56em;
  font-size: 15px;
  line-height: 1.8;
  color: var(--ink);
}

.gen-list {
  list-style: none;
  margin: 0;
  padding: 0;
  border-top: 1px solid var(--line);
}

.gen-list > li {
  margin: 0;
  border-bottom: 1px solid var(--line-soft);
}

.gen-list .gen-item {
  padding: 12px 0;
}

.gen-list .gen-self {
  background: var(--green);
  color: var(--inverse);
  text-align: center;
  padding: 14px;
  font-size: 17px;
  font-weight: 600;
  border-bottom: 0;
}

@media (max-width: 900px) {
  .term-list a {
    grid-template-columns: minmax(0, 1fr) auto;
    gap: 8px;
  }

  .term-list .t {
    font-size: 16px;
  }

  .term-list .c {
    grid-column: 1 / -1;
    font-size: 13px;
  }

  .term-list .a {
    text-align: right;
  }
}