/* ==========================================================================
   文风测试 · wenfengceshi.com
   设计基调：黑白灰、Inter 优先、细线分隔、极克制的动效。
   间距一律取自 4 / 8 / 12 / 16 / 20 / 24 / 40 / 48 / 64 / 80 / 96。
   ========================================================================== */

:root {
  --bg: #fafafa;
  --ink: #1f1a17;
  --ink-strong: #000000;
  --muted: #666666;
  --inverse: #ffffff;
  --line: #cccccc;
  --line-soft: #e5e3e0;
  --hover: #333333;
  --focus: #2673d9;

  --radius: 4px;
  --pill: 9999px;

  --ease: cubic-bezier(0.22, 1, 0.36, 1);
  --dur: 0.2s;

  --container: 1200px;
  --gutter: 64px;
  --section: 80px;

  --font: "Inter", "Helvetica Neue", -apple-system, BlinkMacSystemFont,
    "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", "Source Han Sans SC",
    "Noto Sans CJK SC", sans-serif;
  --mono: ui-monospace, "SF Mono", "Roboto 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: 18px;
  line-height: 1.5;
  font-feature-settings: "kern" 1, "liga" 1;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

body.nav-open {
  overflow: hidden;
}

h1,
h2,
h3,
h4 {
  margin: 0;
  font-weight: 400;
  line-height: 1.35;
}

p {
  margin: 0 0 24px;
}

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

ul,
ol {
  margin: 0 0 24px;
  padding-left: 20px;
}

li {
  margin-bottom: 8px;
}

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

button {
  font: inherit;
  color: inherit;
}

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

:focus-visible {
  outline: 3px solid var(--focus);
  outline-offset: 2px;
}

.skip-link {
  position: absolute;
  left: 16px;
  top: -9999px;
  z-index: 10000;
  background: var(--ink);
  color: var(--inverse);
  padding: 12px 20px;
  border-radius: var(--pill);
}

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

/* ---------- 版式骨架 ---------- */

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

.narrow {
  max-width: 760px;
}

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

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

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

.section-head {
  display: grid;
  grid-template-columns: 180px minmax(0, 1fr);
  gap: 40px;
  align-items: start;
  margin-bottom: 48px;
}

.eyebrow {
  font-size: 11px;
  line-height: 1.5;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: var(--muted);
  padding-top: 8px;
  font-family: var(--mono);
}

.display {
  font-size: 44px;
  font-weight: 700;
  line-height: 1.2;
  letter-spacing: -0.02em;
}

.h2 {
  font-size: 22px;
  line-height: 1.5;
  margin-bottom: 8px;
}

.h3 {
  font-size: 20px;
  line-height: 1.5;
}

.lede {
  font-size: 18px;
  color: var(--ink);
  max-width: 34em;
}

.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: 38em;
}

.prose p {
  font-size: 18px;
  line-height: 1.75;
  margin-bottom: 24px;
}

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

.prose h2 {
  font-size: 24px;
  line-height: 1.45;
  letter-spacing: -0.01em;
  margin: 56px 0 16px;
}

.prose h2:first-child {
  margin-top: 0;
}

.prose h3 {
  font-size: 20px;
  margin: 40px 0 16px;
}

.prose a {
  text-decoration: underline;
  text-underline-offset: 3px;
}

.prose a:hover {
  opacity: 0.6;
}

.prose blockquote {
  margin: 32px 0;
  padding: 0 0 0 24px;
  border-left: 2px solid var(--ink);
  color: var(--ink);
  font-size: 18px;
  line-height: 1.75;
}

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

.prose ul,
.prose ol {
  font-size: 18px;
  line-height: 1.75;
  margin-bottom: 24px;
}

.link {
  text-decoration: underline;
  text-underline-offset: 3px;
  transition: opacity var(--dur) var(--ease);
}

.link:hover {
  opacity: 0.6;
}

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

/* ---------- 顶部导航 ---------- */

.site-header {
  position: sticky;
  top: 0;
  z-index: 999;
  background: rgba(250, 250, 250, 0.94);
  backdrop-filter: blur(10px);
  -webkit-backdrop-filter: blur(10px);
  border-bottom: 1px solid var(--line);
}

.site-header__inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 24px;
  max-width: var(--container);
  margin: 0 auto;
  padding: 16px var(--gutter);
}

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

.brand__mark {
  width: 24px;
  height: 24px;
  background: var(--ink);
  color: var(--inverse);
  border-radius: 3px;
  font-size: 13px;
  font-weight: 700;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  line-height: 1;
}

.brand__text {
  font-size: 16px;
  font-weight: 700;
  letter-spacing: -0.01em;
}

.brand__sub {
  font-size: 11px;
  letter-spacing: 0.08em;
  color: var(--muted);
  font-family: var(--mono);
}

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

.nav a {
  font-size: 16px;
  padding: 8px 12px;
  border-radius: var(--pill);
  white-space: nowrap;
  transition: opacity var(--dur) var(--ease),
    background-color var(--dur) var(--ease);
}

.nav a:hover {
  opacity: 0.6;
}

.nav a[aria-current="page"] {
  color: var(--ink-strong);
  font-weight: 700;
  text-decoration: underline;
  text-underline-offset: 4px;
}

.nav__cta {
  margin-left: 12px;
}

.nav-toggle {
  display: none;
  width: 44px;
  height: 44px;
  border: 1px solid var(--line);
  border-radius: var(--pill);
  background: transparent;
  cursor: pointer;
  align-items: center;
  justify-content: center;
  padding: 0;
}

.nav-toggle__bars {
  position: relative;
  width: 16px;
  height: 10px;
  display: block;
}

.nav-toggle__bars::before,
.nav-toggle__bars::after {
  content: "";
  position: absolute;
  left: 0;
  width: 16px;
  height: 1.5px;
  background: var(--ink);
  transition: transform var(--dur) var(--ease), top var(--dur) var(--ease);
}

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

.nav-toggle__bars::after {
  top: 8.5px;
}

.nav-toggle[aria-expanded="true"] .nav-toggle__bars::before {
  top: 4px;
  transform: rotate(45deg);
}

.nav-toggle[aria-expanded="true"] .nav-toggle__bars::after {
  top: 4px;
  transform: rotate(-45deg);
}

.mobile-nav {
  display: none;
}

/* ---------- 按钮 ---------- */

.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-height: 44px;
  padding: 12px 24px;
  border-radius: var(--pill);
  border: 1px solid transparent;
  font-size: 16px;
  line-height: 1;
  cursor: pointer;
  background: transparent;
  transition: background-color var(--dur) var(--ease),
    color var(--dur) var(--ease), border-color var(--dur) var(--ease),
    opacity var(--dur) var(--ease);
  text-align: center;
}

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

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

.btn--primary:active {
  background: var(--ink-strong);
  border-color: var(--ink-strong);
}

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

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

.btn--ghost {
  background: transparent;
  color: var(--muted);
  padding: 12px 16px;
}

.btn--ghost:hover {
  background: #eceae7;
  color: var(--ink-strong);
}

.btn:disabled {
  cursor: not-allowed;
  opacity: 0.45;
}

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

/* ---------- 首页 Hero ---------- */

.hero {
  padding: 64px 0 48px;
}

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

.hero h1 {
  font-size: 44px;
  font-weight: 700;
  line-height: 1.15;
  letter-spacing: -0.02em;
  margin-bottom: 24px;
  text-wrap: balance;
}

.hero__lede {
  font-size: 18px;
  line-height: 1.7;
  max-width: 36em;
  margin-bottom: 40px;
}

.hero__meta {
  display: flex;
  flex-wrap: wrap;
  gap: 8px 24px;
  margin-top: 24px;
  font-size: 14px;
  color: var(--muted);
}

.hero__meta span {
  display: inline-flex;
  align-items: center;
  gap: 8px;
}

.hero__meta span::before {
  content: "";
  width: 5px;
  height: 5px;
  border-radius: 50%;
  background: var(--ink);
  display: inline-block;
}

/* ---------- 分析工具 ---------- */

.tool {
  background: var(--inverse);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  padding: 40px;
}

.tool__top {
  display: flex;
  align-items: baseline;
  justify-content: space-between;
  gap: 16px;
  margin-bottom: 12px;
}

.tool__label {
  font-size: 14px;
  letter-spacing: 0.06em;
  color: var(--muted);
}

.tool__counter {
  font-size: 14px;
  color: var(--muted);
  font-family: var(--mono);
  font-variant-numeric: tabular-nums;
}

.tool__counter.is-low {
  color: var(--ink-strong);
}

.tool textarea {
  display: block;
  width: 100%;
  min-height: 208px;
  resize: vertical;
  padding: 16px;
  background: var(--bg);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  color: var(--ink);
  font-family: var(--font);
  font-size: 17px;
  line-height: 1.85;
  transition: border-color var(--dur) var(--ease);
}

.tool textarea::placeholder {
  color: #9a9a9a;
}

.tool textarea:focus {
  border-color: var(--ink);
  outline: none;
  box-shadow: none;
}

.tool textarea:focus-visible {
  outline: 3px solid var(--focus);
  outline-offset: 2px;
}

.tool__samples {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 8px;
  margin: 16px 0 24px;
}

.tool__samples-label {
  font-size: 14px;
  color: var(--muted);
  margin-right: 4px;
}

.chip {
  border: 1px solid var(--line);
  background: transparent;
  color: var(--ink);
  border-radius: var(--pill);
  padding: 7px 14px;
  font-size: 14px;
  cursor: pointer;
  min-height: 36px;
  transition: background-color var(--dur) var(--ease),
    color var(--dur) var(--ease), border-color var(--dur) var(--ease);
}

.chip:hover {
  background: var(--hover);
  border-color: var(--hover);
  color: var(--inverse);
}

.tool__bottom {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  justify-content: space-between;
  gap: 16px;
}

.tool__note {
  margin: 0;
  font-size: 13px;
  color: var(--muted);
  max-width: 34em;
}

.tool__error {
  margin: 16px 0 0;
  padding: 12px 16px;
  border-left: 2px solid var(--ink-strong);
  background: #f3f1ee;
  font-size: 14px;
  color: var(--ink);
  display: none;
}

.tool__error.is-on {
  display: block;
}

/* ---------- 结果 ---------- */

.result {
  margin-top: 40px;
  border: 1px solid var(--line);
  border-radius: var(--radius);
  overflow: hidden;
  background: var(--inverse);
  animation: rise 0.5s var(--ease) both;
}

@keyframes rise {
  from {
    opacity: 0;
    transform: translateY(8px);
  }
  to {
    opacity: 1;
    transform: none;
  }
}

.result__head {
  background: var(--ink);
  color: var(--inverse);
  padding: 40px;
  display: grid;
  grid-template-columns: minmax(0, 1fr) auto;
  gap: 24px;
  align-items: end;
}

.result__kicker {
  font-size: 11px;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: rgba(255, 255, 255, 0.64);
  font-family: var(--mono);
  margin-bottom: 16px;
}

.result__name {
  font-size: 32px;
  font-weight: 700;
  line-height: 1.25;
  letter-spacing: -0.01em;
  margin-bottom: 8px;
}

.result__sub {
  color: rgba(255, 255, 255, 0.74);
  font-size: 16px;
  margin: 0;
}

.result__score {
  text-align: right;
  font-size: 56px;
  font-weight: 700;
  line-height: 1;
  letter-spacing: -0.03em;
  font-variant-numeric: tabular-nums;
}

.result__score small {
  font-size: 18px;
  font-weight: 400;
  margin-left: 2px;
  vertical-align: 8px;
}

.result__score-label {
  display: block;
  font-size: 12px;
  letter-spacing: 0.06em;
  color: rgba(255, 255, 255, 0.8);
  margin-top: 8px;
  font-family: var(--mono);
  font-weight: 400;
}

.result__body {
  padding: 40px;
  display: grid;
  grid-template-columns: minmax(0, 1.25fr) minmax(0, 1fr);
  gap: 48px;
}

.result__panel-title {
  font-size: 11px;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: var(--muted);
  font-family: var(--mono);
  margin-bottom: 16px;
}

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

.bar {
  display: grid;
  grid-template-columns: 96px minmax(0, 1fr) 40px;
  align-items: center;
  gap: 16px;
  padding: 12px 0;
  border-bottom: 1px solid var(--line-soft);
}

.bar:first-child {
  border-top: 1px solid var(--line-soft);
}

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

.bar__track {
  position: relative;
  height: 4px;
  background: #e6e4e1;
  border-radius: 2px;
  overflow: hidden;
}

.bar__fill {
  position: absolute;
  left: 0;
  top: 0;
  bottom: 0;
  width: 0;
  background: var(--ink);
  border-radius: 2px;
  transition: width 0.6s var(--ease);
}

.bar__value {
  font-size: 12px;
  color: var(--muted);
  text-align: right;
  font-family: var(--mono);
  font-variant-numeric: tabular-nums;
}

.coord {
  border: 1px solid var(--line-soft);
  border-radius: var(--radius);
  padding: 8px;
  background: #fbfaf9;
}

.coord svg {
  display: block;
  width: 100%;
  height: auto;
}

.coord__caption {
  font-size: 12px;
  color: var(--muted);
  text-align: center;
  margin: 8px 0 4px;
}

.stat-table {
  width: 100%;
  border-collapse: collapse;
  font-size: 14px;
  margin-top: 24px;
}

.stat-table th,
.stat-table td {
  text-align: left;
  padding: 10px 0;
  border-bottom: 1px solid var(--line-soft);
  font-weight: 400;
  vertical-align: top;
}

.stat-table th {
  color: var(--muted);
  width: 45%;
}

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

.reading {
  padding: 0 40px 40px;
}

.rank {
  margin-top: 32px;
}

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

.rank li {
  display: grid;
  grid-template-columns: 18px minmax(0, 1fr) auto;
  gap: 12px;
  align-items: baseline;
  margin: 0;
  padding: 10px 0;
  border-bottom: 1px solid var(--line-soft);
  font-size: 14px;
}

.rank li span:first-child,
.rank li span:last-child {
  font-family: var(--mono);
  font-size: 11px;
  color: var(--muted);
  font-variant-numeric: tabular-nums;
}

.rank li span:last-child {
  text-align: right;
}

.reading h3 {
  font-size: 16px;
  margin: 32px 0 12px;
  padding-top: 24px;
  border-top: 1px solid var(--line-soft);
}

.reading h3:first-child {
  margin-top: 0;
  padding-top: 0;
  border-top: 0;
}

.reading p {
  font-size: 17px;
  line-height: 1.8;
  margin-bottom: 16px;
  max-width: 44em;
}

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

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

.advice li {
  counter-increment: advice;
  display: grid;
  grid-template-columns: 32px minmax(0, 1fr);
  gap: 12px;
  padding: 16px 0;
  border-bottom: 1px solid var(--line-soft);
  margin: 0;
  font-size: 16px;
  line-height: 1.7;
}

.advice li::before {
  content: counter(advice, decimal-leading-zero);
  font-size: 12px;
  color: var(--muted);
  font-family: var(--mono);
  padding-top: 4px;
}

.result__foot {
  padding: 24px 40px;
  border-top: 1px solid var(--line-soft);
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  align-items: center;
  justify-content: space-between;
}

.result__disclaimer {
  font-size: 12px;
  color: var(--muted);
  margin: 0;
}

/* ---------- 首页模块 ---------- */

.split {
  display: grid;
  grid-template-columns: 180px minmax(0, 1fr);
  gap: 40px;
}

.body-copy {
  max-width: 38em;
}

.body-copy p {
  font-size: 18px;
  line-height: 1.75;
  margin-bottom: 24px;
}

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

.metrics {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  border-top: 1px solid var(--line);
}

.metric {
  padding: 24px 24px 24px 0;
  border-bottom: 1px solid var(--line-soft);
}

.metric:nth-child(odd) {
  border-right: 1px solid var(--line-soft);
  padding-right: 40px;
}

.metric:nth-child(even) {
  padding-left: 40px;
}

.metric__title {
  font-size: 16px;
  margin-bottom: 8px;
  display: flex;
  align-items: baseline;
  gap: 12px;
}

.metric__index {
  font-size: 11px;
  color: var(--muted);
  font-family: var(--mono);
}

.metric p {
  font-size: 15px;
  line-height: 1.7;
  color: var(--muted);
  margin: 0;
  max-width: 30em;
}

.arch-grid {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 24px;
}

.arch-card {
  display: flex;
  flex-direction: column;
  gap: 12px;
  padding: 32px;
  background: var(--inverse);
  border: 1px solid transparent;
  border-radius: var(--radius);
  transition: border-color var(--dur) var(--ease);
}

.arch-card:hover {
  border-color: var(--line);
}

.arch-card__no {
  font-size: 11px;
  letter-spacing: 0.14em;
  color: var(--muted);
  font-family: var(--mono);
}

.arch-card__name {
  font-size: 20px;
  line-height: 1.4;
}

.arch-card__desc {
  font-size: 15px;
  line-height: 1.7;
  color: var(--muted);
  margin: 0;
}

.arch-card__link {
  margin-top: auto;
  padding-top: 12px;
  font-size: 14px;
  text-decoration: underline;
  text-underline-offset: 4px;
  align-self: flex-start;
}

.steps {
  display: grid;
  grid-template-columns: repeat(4, minmax(0, 1fr));
  gap: 0;
  border-top: 1px solid var(--line);
}

.step {
  padding: 32px 24px 32px 0;
  border-bottom: 1px solid var(--line-soft);
}

.step + .step {
  padding-left: 24px;
  border-left: 1px solid var(--line-soft);
}

.step__no {
  font-size: 11px;
  font-family: var(--mono);
  color: var(--muted);
  letter-spacing: 0.14em;
  margin-bottom: 16px;
}

.step h3 {
  font-size: 18px;
  margin-bottom: 8px;
}

.step p {
  font-size: 15px;
  line-height: 1.7;
  color: var(--muted);
  margin: 0;
}

.sample-block {
  display: grid;
  grid-template-columns: minmax(0, 1fr) minmax(0, 1fr);
  gap: 40px;
  align-items: start;
}

.sample-text {
  background: var(--inverse);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  padding: 32px;
  font-size: 17px;
  line-height: 1.9;
  color: var(--ink);
  margin: 0;
  text-indent: 2em;
}

.sample-notes {
  font-size: 15px;
  line-height: 1.8;
}

.sample-notes dl {
  margin: 0;
}

.sample-notes dt {
  font-size: 11px;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: var(--muted);
  font-family: var(--mono);
  padding-top: 16px;
  border-top: 1px solid var(--line-soft);
  margin-bottom: 6px;
}

.sample-notes dd {
  margin: 0 0 16px;
}

.sample-notes dd:last-child {
  margin-bottom: 0;
}

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

.note-list li {
  counter-increment: note;
  display: grid;
  grid-template-columns: 28px minmax(0, 1fr);
  gap: 12px;
  padding: 20px 0;
  border-bottom: 1px solid var(--line-soft);
  margin: 0;
  font-size: 16px;
  line-height: 1.75;
}

.note-list li:first-child {
  padding-top: 0;
}

.note-list li::before {
  content: counter(note, decimal-leading-zero);
  font-size: 11px;
  font-family: var(--mono);
  color: var(--muted);
  padding-top: 5px;
}

.note-list strong {
  font-weight: 400;
  display: block;
  margin-bottom: 4px;
}

.note-list li p {
  margin: 0;
  color: var(--muted);
}

.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: 24px 0;
  font-size: 18px;
  cursor: pointer;
  list-style: none;
}

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

.faq-list summary::after {
  content: "+";
  font-size: 20px;
  color: var(--muted);
  line-height: 1;
  flex: none;
  transition: transform var(--dur) var(--ease);
}

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

.faq-list details p {
  margin: 0 0 24px;
  max-width: 44em;
  color: var(--ink);
  font-size: 16px;
  line-height: 1.8;
}

.faq-list details p:last-child {
  margin-bottom: 24px;
}

.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: 88px minmax(0, 1fr) 120px;
  gap: 24px;
  padding: 24px 0;
  align-items: baseline;
  transition: opacity var(--dur) var(--ease);
}

.article-list a:hover {
  opacity: 0.6;
}

.article-list .no {
  font-size: 11px;
  font-family: var(--mono);
  color: var(--muted);
  letter-spacing: 0.1em;
}

.article-list .t {
  font-size: 18px;
  line-height: 1.5;
}

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

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

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

.cta-band__inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 40px;
  flex-wrap: wrap;
}

.cta-band h2 {
  font-size: 28px;
  line-height: 1.4;
  margin-bottom: 8px;
  color: var(--inverse);
}

.cta-band p {
  margin: 0;
  color: rgba(255, 255, 255, 0.72);
  font-size: 16px;
}

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

.cta-band .btn:hover {
  background: #e6e6e6;
  border-color: #e6e6e6;
}

/* ---------- 内页 ---------- */

.page-head {
  padding: 48px 0 40px;
  border-bottom: 1px solid var(--line-soft);
}

.breadcrumb {
  font-size: 12px;
  color: var(--muted);
  margin-bottom: 40px;
  font-family: var(--mono);
}

.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 {
  opacity: 0.6;
}

.page-head h1 {
  font-size: 44px;
  font-weight: 700;
  line-height: 1.2;
  letter-spacing: -0.02em;
  margin-bottom: 24px;
  max-width: 22em;
  text-wrap: balance;
}

.page-head__lede {
  font-size: 18px;
  line-height: 1.75;
  max-width: 40em;
  color: var(--ink);
  margin: 0;
}

.page-head__meta {
  margin-top: 24px;
  font-size: 12px;
  color: var(--muted);
  font-family: var(--mono);
  letter-spacing: 0.04em;
}

.article-head {
  padding: 48px 0 40px;
}

.article-head h1 {
  font-size: 34px;
  font-weight: 700;
  line-height: 1.3;
  letter-spacing: -0.015em;
  margin-bottom: 24px;
  max-width: 24em;
  text-wrap: balance;
}

.article-body {
  padding: 24px 0 64px;
}

.article-body .prose {
  max-width: 38em;
}

.article-body .prose > p:first-of-type::first-letter {
  font-size: 1em;
}

.article-foot {
  padding: 40px 0 64px;
  border-top: 1px solid var(--line-soft);
  display: flex;
  flex-wrap: wrap;
  gap: 24px;
  justify-content: space-between;
  align-items: flex-start;
}

.article-foot__nav {
  display: flex;
  gap: 24px;
  flex-wrap: wrap;
  font-size: 14px;
}

.article-foot__nav a {
  text-decoration: underline;
  text-underline-offset: 3px;
}

.article-foot__nav a:hover {
  opacity: 0.6;
}

.related {
  border-top: 1px solid var(--line-soft);
  padding: 48px 0 64px;
}

.related h2 {
  font-size: 14px;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  color: var(--muted);
  margin-bottom: 24px;
  font-family: var(--mono);
}

.related ul {
  list-style: none;
  padding: 0;
  margin: 0;
  font-size: 16px;
  line-height: 1.7;
}

.related li {
  margin-bottom: 12px;
}

.related a {
  text-decoration: underline;
  text-underline-offset: 3px;
}

.related a:hover {
  opacity: 0.6;
}

.arch-section {
  display: grid;
  grid-template-columns: 180px minmax(0, 1fr);
  gap: 40px;
  padding: 48px 0;
  border-top: 1px solid var(--line-soft);
}

.arch-section:first-of-type {
  border-top: 0;
}

.arch-section__aside {
  position: sticky;
  top: 96px;
  align-self: start;
}

.arch-section__no {
  font-size: 11px;
  letter-spacing: 0.14em;
  color: var(--muted);
  font-family: var(--mono);
  margin-bottom: 8px;
}

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

.arch-section h2 {
  font-size: 28px;
  line-height: 1.35;
  margin-bottom: 8px;
}

.arch-section__sub {
  font-size: 15px;
  color: var(--muted);
  margin-bottom: 24px;
}

.arch-section p {
  font-size: 17px;
  line-height: 1.8;
  max-width: 40em;
}

.arch-quote {
  margin: 24px 0 32px;
  padding: 24px 0;
  border-top: 1px solid var(--line-soft);
  border-bottom: 1px solid var(--line-soft);
  font-size: 17px;
  line-height: 1.9;
  max-width: 38em;
}

.arch-quote span {
  display: block;
  font-size: 11px;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: var(--muted);
  font-family: var(--mono);
  margin-bottom: 12px;
}

.arch-facts {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 24px;
  max-width: 48em;
  margin: 0;
}

.arch-facts div {
  border-top: 1px solid var(--line);
  padding-top: 12px;
}

.arch-facts dt {
  font-size: 11px;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: var(--muted);
  font-family: var(--mono);
  margin-bottom: 6px;
}

.arch-facts dd {
  margin: 0;
  font-size: 14px;
  line-height: 1.7;
}

.toc {
  border-top: 1px solid var(--line);
  padding-top: 16px;
  margin-bottom: 32px;
}

.toc p {
  font-size: 11px;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: var(--muted);
  font-family: var(--mono);
  margin-bottom: 12px;
}

.toc ol {
  margin: 0;
  padding-left: 20px;
  font-size: 15px;
  line-height: 1.8;
  color: var(--ink);
}

.toc--wide ol {
  columns: 2;
  column-gap: 48px;
}

@media (max-width: 600px) {
  .toc--wide ol {
    columns: 1;
  }
}

.toc a {
  text-decoration: underline;
  text-underline-offset: 3px;
}

.table-wrap {
  overflow-x: auto;
  margin: 24px 0 32px;
  border-top: 1px solid var(--line);
}

table.data {
  border-collapse: collapse;
  width: 100%;
  font-size: 15px;
  min-width: 480px;
}

table.data th,
table.data td {
  text-align: left;
  padding: 12px 16px 12px 0;
  border-bottom: 1px solid var(--line-soft);
  vertical-align: top;
  line-height: 1.65;
}

table.data th {
  font-size: 11px;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  color: var(--muted);
  font-family: var(--mono);
  font-weight: 400;
}

table.data td:first-child {
  white-space: nowrap;
  font-family: var(--mono);
  font-size: 13px;
}

/* 句子长度分布 */

.hist {
  display: flex;
  align-items: flex-end;
  gap: 16px;
  height: 150px;
  margin: 16px 0 8px;
  padding-bottom: 4px;
  border-bottom: 1px solid var(--line);
}

.hist__col {
  flex: 1;
  height: 100%;
  display: flex;
  flex-direction: column;
  justify-content: flex-end;
  align-items: center;
  gap: 6px;
}

.hist__n {
  font-size: 11px;
  color: var(--muted);
  font-family: var(--mono);
}

.hist__bar {
  width: 100%;
  max-width: 48px;
  background: var(--ink);
  transition: height 0.5s var(--ease);
}

.hist__x {
  font-size: 11px;
  color: var(--muted);
  font-family: var(--mono);
  white-space: nowrap;
}

.hist__caption {
  font-size: 12px;
  color: var(--muted);
  margin: 8px 0 0;
}

.result__note {
  margin: 0 0 24px;
  padding: 10px 0 10px 16px;
  border-left: 2px solid var(--line);
  font-size: 14px;
  line-height: 1.7;
  color: var(--muted);
}

.tool--tall textarea {
  min-height: 320px;
}

/* 历史记录 */

.history {
  margin-top: 40px;
}

.history__head {
  display: flex;
  align-items: baseline;
  justify-content: space-between;
  gap: 16px;
  padding-bottom: 12px;
  border-bottom: 1px solid var(--line);
}

.history__title {
  font-size: 11px;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: var(--muted);
  font-family: var(--mono);
}

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

.history__list li {
  display: grid;
  grid-template-columns: 88px minmax(0, 1fr) auto;
  gap: 16px;
  align-items: baseline;
  padding: 16px 0;
  border-bottom: 1px solid var(--line-soft);
  margin: 0;
  font-size: 15px;
}

.history__time {
  font-size: 12px;
  color: var(--muted);
  font-family: var(--mono);
}

.history__excerpt {
  color: var(--ink);
  overflow: hidden;
  text-overflow: ellipsis;
  white-space: nowrap;
}

.history__score {
  font-size: 12px;
  font-family: var(--mono);
  color: var(--muted);
}

.history__list li.history__empty {
  display: block;
  padding: 24px 0;
  color: var(--muted);
  font-size: 15px;
  border-bottom: 1px solid var(--line-soft);
}

/* ---------- 页脚 ---------- */

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

.footer__top {
  display: grid;
  grid-template-columns: minmax(0, 1.4fr) repeat(3, minmax(0, 1fr));
  gap: 40px;
  padding-bottom: 48px;
  border-bottom: 1px solid var(--line-soft);
}

.footer__brand p {
  font-size: 14px;
  line-height: 1.7;
  color: var(--muted);
  max-width: 24em;
  margin: 16px 0 0;
}

.footer__col h2 {
  font-size: 11px;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: var(--muted);
  font-family: var(--mono);
  margin-bottom: 16px;
  font-weight: 400;
}

.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: opacity var(--dur) var(--ease);
}

.footer__col a:hover {
  opacity: 0.6;
}

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

.footer__bottom p {
  margin: 0;
}

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

.notfound {
  padding: 96px 0;
  text-align: left;
}

.notfound__code {
  font-size: 96px;
  font-weight: 700;
  line-height: 1;
  letter-spacing: -0.04em;
  margin-bottom: 24px;
}

/* ---------- 响应式 ---------- */

@media (max-width: 959px) {
  :root {
    --gutter: 24px;
    --section: 48px;
  }

  body {
    font-size: 17px;
  }

  .site-header__inner {
    padding: 12px var(--gutter);
  }

  .nav {
    display: none;
  }

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

  .mobile-nav {
    display: block;
    position: fixed;
    inset: 0;
    z-index: 9999;
    background: var(--bg);
    padding: 24px var(--gutter) 48px;
    transform: translateY(-8px);
    opacity: 0;
    visibility: hidden;
    transition: opacity var(--dur) var(--ease),
      transform var(--dur) var(--ease), visibility var(--dur) 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: 24px;
    border-bottom: 1px solid var(--line);
    margin-bottom: 24px;
  }

  .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: 22px;
  }

  .mobile-nav .btn {
    margin-top: 32px;
    width: 100%;
  }

  .hero {
    padding: 40px 0 24px;
  }

  .hero h1 {
    font-size: 32px;
  }

  .hero__lede {
    font-size: 17px;
  }

  .section-head,
  .split,
  .arch-section {
    grid-template-columns: minmax(0, 1fr);
    gap: 16px;
  }

  .eyebrow {
    padding-top: 0;
  }

  .arch-section__aside {
    position: static;
  }

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

  .metric,
  .metric:nth-child(odd),
  .metric:nth-child(even) {
    padding: 20px 0;
    border-right: 0;
  }

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

  .arch-card {
    padding: 24px;
  }

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

  .step,
  .step + .step {
    padding: 24px 0;
    border-left: 0;
  }

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

  .result__head {
    grid-template-columns: minmax(0, 1fr);
    gap: 16px;
    padding: 24px;
  }

  .result__score {
    text-align: left;
    font-size: 44px;
  }

  .result__body {
    grid-template-columns: minmax(0, 1fr);
    gap: 32px;
    padding: 24px;
  }

  .reading {
    padding: 0 24px 24px;
  }

  .result__foot {
    padding: 24px;
  }

  .tool {
    padding: 24px;
  }

  .page-head h1 {
    font-size: 32px;
  }

  .article-head h1 {
    font-size: 28px;
  }

  .article-list a {
    grid-template-columns: 48px minmax(0, 1fr);
    gap: 16px;
  }

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

  .footer__top {
    grid-template-columns: minmax(0, 1fr) minmax(0, 1fr);
    gap: 32px;
  }

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

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

  .cta-band {
    padding: 48px 0;
  }

  .cta-band h2 {
    font-size: 24px;
  }
}

@media (max-width: 600px) {
  .brand__sub {
    display: none;
  }

  .hero h1 {
    font-size: 28px;
  }

  .display,
  .notfound__code {
    font-size: 56px;
  }

  .result__name {
    font-size: 26px;
  }

  .bar {
    grid-template-columns: 80px minmax(0, 1fr) 36px;
    gap: 12px;
  }

  .tool__bottom {
    flex-direction: column;
    align-items: stretch;
  }

  .tool__bottom .btn-group .btn {
    flex: 1;
  }

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

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

  .history__time {
    display: none;
  }
}

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

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