@charset "UTF-8";

/* ==========================================================================
   火星文转换 · huoxingwenzhuanhuan.com
   设计基调：大留白、细边框、胶囊按钮、近黑主色 + 金/蓝点缀。
   ========================================================================== */

:root {
  /* 颜色 */
  --c-primary: #333333;
  --c-bg: #fafafa;
  --c-surface: #ffffff;
  --c-text: #333333;
  --c-text-soft: #4f4f4f;
  --c-text-muted: #6f6f6f;
  --c-text-faint: #8a8a8a;
  --c-inverse: #ffffff;
  --c-border: #d9d9d9;
  --c-border-soft: #e6e6e6;
  --c-dark: #282828;
  --c-gold: #bf8d30;
  --c-gold-ink: #7a5a1e;
  --c-blue: #3098bf;
  --c-blue-ink: #1e6c8a;
  --c-red: #c25b4a;

  /* 字体 */
  --font: "Apercu-Adjusted", "Helvetica Neue", Helvetica, Arial,
    "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", "Source Han Sans SC",
    sans-serif;
  --font-mono: "Apercu", ui-monospace, SFMono-Regular, Menlo, Consolas,
    "PingFang SC", monospace;

  /* 字号 */
  --fs-display: clamp(40px, 6.6vw, 84px);
  --fs-h1: clamp(32px, 4.2vw, 56px);
  --fs-h2: clamp(27px, 3.1vw, 48px);
  --fs-h3: clamp(21px, 2vw, 27px);
  --fs-h4: 20px;
  --fs-body: 18px;
  --fs-sm: 16px;
  --fs-cap: 14px;
  --fs-xs: 12px;

  /* 间距 */
  --sp-1: 4px;
  --sp-2: 8px;
  --sp-3: 12px;
  --sp-4: 16px;
  --sp-5: 20px;
  --sp-6: 24px;
  --sp-8: 32px;
  --sp-10: 40px;
  --sp-12: 48px;
  --sp-16: 64px;

  /* 圆角 */
  --r-sm: 2px;
  --r-md: 5px;
  --r-lg: 12px;
  --r-xl: 25px;
  --r-full: 9999px;

  /* 动效 */
  --ease: cubic-bezier(0.25, 0.46, 0.45, 0.94);
  --dur: 0.4s;
  --dur-short: 0.1s;

  /* 阴影 */
  --shadow-pop: 0 4px 5px rgba(51, 51, 51, 0.05);
  --shadow-lift: 0 10px 30px rgba(51, 51, 51, 0.07);

  --nav-h: 86px;
  --container: 1200px;
}

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

html {
  -webkit-text-size-adjust: 100%;
  text-size-adjust: 100%;
  scroll-behavior: smooth;
  scroll-padding-top: calc(var(--nav-h) + 16px);
}

body {
  margin: 0;
  background: var(--c-bg);
  color: var(--c-text);
  font-family: var(--font);
  font-size: var(--fs-body);
  line-height: 1.6;
  font-weight: 400;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
  overflow-x: hidden;
}

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

h1,
h2,
h3,
h4,
h5,
h6 {
  margin: 0;
  font-weight: 600;
  line-height: 1.2;
  letter-spacing: -0.02em;
}

p {
  margin: 0;
}

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

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

button,
input,
textarea,
select {
  font-family: inherit;
  font-size: inherit;
  color: inherit;
}

button {
  cursor: pointer;
}

::selection {
  background: rgba(191, 141, 48, 0.22);
}

:focus-visible {
  outline: 2px solid var(--c-blue-ink);
  outline-offset: 3px;
  border-radius: 2px;
}

.container {
  width: 100%;
  max-width: var(--container);
  margin: 0 auto;
  padding: 0 40px;
}

.visually-hidden {
  position: absolute !important;
  width: 1px;
  height: 1px;
  padding: 0;
  margin: -1px;
  overflow: hidden;
  clip: rect(0, 0, 0, 0);
  white-space: nowrap;
  border: 0;
}

.skip-link {
  position: absolute;
  left: 16px;
  top: -80px;
  z-index: 200;
  background: var(--c-primary);
  color: var(--c-inverse);
  padding: 12px 20px;
  border-radius: var(--r-md);
  transition: top var(--dur-short) var(--ease);
}

.skip-link:focus {
  top: 12px;
}

/* --------------------------------------------------------------------------
   页头
   -------------------------------------------------------------------------- */
.site-header {
  position: sticky;
  top: 0;
  z-index: 50;
  background: rgba(250, 250, 250, 0.88);
  -webkit-backdrop-filter: saturate(1.5) blur(14px);
  backdrop-filter: saturate(1.5) blur(14px);
  border-bottom: 1px solid transparent;
  transition: border-color var(--dur-short) var(--ease),
    background-color var(--dur-short) var(--ease),
    box-shadow var(--dur-short) var(--ease);
}

.site-header.is-scrolled {
  background: rgba(250, 250, 250, 0.95);
  border-bottom-color: var(--c-border-soft);
  box-shadow: 0 1px 0 rgba(51, 51, 51, 0.02);
}

.nav {
  height: var(--nav-h);
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: var(--sp-8);
}

.brand {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  flex: none;
}

.brand__mark {
  width: 34px;
  height: 34px;
  border-radius: 8px;
  background: var(--c-primary);
  color: var(--c-inverse);
  display: grid;
  place-items: center;
  transition: transform var(--dur-short) var(--ease);
}

.brand:hover .brand__mark {
  transform: rotate(-8deg);
}

.brand__text {
  display: flex;
  flex-direction: column;
  line-height: 1.1;
}

.brand__name {
  font-size: 19px;
  font-weight: 600;
  letter-spacing: -0.01em;
}

.brand__sub {
  font-size: 10px;
  letter-spacing: 0.26em;
  color: var(--c-text-faint);
  text-transform: uppercase;
  margin-top: 3px;
}

.nav__links {
  display: flex;
  align-items: center;
  gap: 2px;
  margin-left: auto;
}

.nav__link {
  position: relative;
  padding: 10px 12px;
  font-size: 15px;
  color: var(--c-text);
  border-radius: var(--r-md);
  transition: color var(--dur-short) var(--ease),
    background-color var(--dur-short) var(--ease);
  white-space: nowrap;
}

.nav__link:hover {
  color: rgba(51, 51, 51, 0.68);
  background: rgba(51, 51, 51, 0.04);
}

.nav__link[aria-current="page"] {
  font-weight: 500;
}

.nav__link[aria-current="page"]::after {
  content: "";
  position: absolute;
  left: 12px;
  right: 12px;
  bottom: 4px;
  height: 2px;
  background: var(--c-primary);
}

.nav__side {
  display: flex;
  align-items: center;
  gap: 12px;
  flex: none;
  margin-left: var(--sp-4);
}

.nav-toggle {
  display: none;
  width: 44px;
  height: 44px;
  border: 1px solid var(--c-border);
  border-radius: var(--r-md);
  background: transparent;
  padding: 0;
  place-items: center;
}

.nav-toggle span {
  display: block;
  width: 18px;
  height: 1.5px;
  background: var(--c-primary);
  margin: 4px auto;
  transition: transform var(--dur-short) var(--ease),
    opacity var(--dur-short) var(--ease);
}

.nav-toggle[aria-expanded="true"] span:nth-child(1) {
  transform: translateY(5.5px) rotate(45deg);
}

.nav-toggle[aria-expanded="true"] span:nth-child(2) {
  opacity: 0;
}

.nav-toggle[aria-expanded="true"] span:nth-child(3) {
  transform: translateY(-5.5px) rotate(-45deg);
}

.mobile-nav {
  display: none;
  border-top: 1px solid var(--c-border-soft);
  background: var(--c-bg);
  padding: var(--sp-4) 40px var(--sp-6);
}

.mobile-nav__list {
  display: grid;
  gap: 2px;
}

.mobile-nav__list a {
  display: block;
  padding: 13px 4px;
  font-size: 17px;
  border-bottom: 1px solid var(--c-border-soft);
}

.mobile-nav__list a[aria-current="page"] {
  font-weight: 600;
}

.mobile-nav__cta {
  margin-top: var(--sp-4);
  width: 100%;
}

/* --------------------------------------------------------------------------
   按钮
   -------------------------------------------------------------------------- */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  padding: 14px 28px;
  border: 1px solid transparent;
  border-radius: var(--r-xl);
  background: var(--c-primary);
  color: #fafafa;
  font-size: var(--fs-sm);
  font-weight: 500;
  line-height: 1.2;
  text-align: center;
  transition: transform var(--dur-short) var(--ease),
    box-shadow var(--dur-short) var(--ease),
    background-color var(--dur-short) var(--ease),
    color var(--dur-short) var(--ease),
    border-color var(--dur-short) var(--ease);
}

.btn:hover {
  transform: translateY(-1px);
  box-shadow: 0 6px 16px rgba(51, 51, 51, 0.14);
}

.btn:active {
  transform: translateY(0);
  box-shadow: none;
}

.btn--secondary {
  background: transparent;
  border-color: var(--c-primary);
  color: var(--c-primary);
}

.btn--secondary:hover {
  background: var(--c-primary);
  color: #fafafa;
}

.btn--ghost {
  background: transparent;
  border-color: transparent;
  color: var(--c-primary);
  padding: 8px 12px;
  font-weight: 400;
}

.btn--ghost:hover {
  background: rgba(51, 51, 51, 0.05);
  box-shadow: none;
  text-decoration: underline;
  text-underline-offset: 4px;
}

.btn--light {
  background: #fafafa;
  color: var(--c-primary);
}

.btn--light:hover {
  background: #ffffff;
}

.btn--sm {
  padding: 10px 18px;
  font-size: var(--fs-cap);
}

.btn--lg {
  padding: 17px 34px;
  font-size: var(--fs-body);
}

.btn--block {
  width: 100%;
}

.text-link {
  color: var(--c-text);
  text-decoration: underline;
  text-decoration-color: transparent;
  text-decoration-thickness: 1px;
  text-underline-offset: 3px;
  transition: text-decoration-color var(--dur-short) var(--ease),
    color var(--dur-short) var(--ease);
}

.text-link:hover {
  text-decoration-color: currentColor;
}

.link-more {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  font-size: var(--fs-sm);
  font-weight: 500;
}

.link-more svg {
  transition: transform var(--dur-short) var(--ease);
}

.link-more:hover svg {
  transform: translateX(3px);
}

/* --------------------------------------------------------------------------
   通用版式
   -------------------------------------------------------------------------- */
.section {
  padding: var(--sp-16) 0;
}

.section--tight {
  padding: var(--sp-12) 0;
}

.section--white {
  background: var(--c-surface);
  border-top: 1px solid var(--c-border-soft);
  border-bottom: 1px solid var(--c-border-soft);
}

.section--dark {
  background: var(--c-dark);
  color: var(--c-inverse);
}

.section-head {
  max-width: 780px;
  margin-bottom: var(--sp-10);
}

.section-head--center {
  margin-left: auto;
  margin-right: auto;
  text-align: center;
}

.section-head--center .eyebrow {
  justify-content: center;
}

.eyebrow {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  font-size: var(--fs-xs);
  font-weight: 600;
  letter-spacing: 0.18em;
  text-transform: uppercase;
  color: var(--c-gold-ink);
}

.eyebrow::before {
  content: "";
  width: 22px;
  height: 1px;
  background: var(--c-gold);
}

.eyebrow--light {
  color: #d7b673;
}

.eyebrow--light::before {
  background: #d7b673;
}

.section-title {
  font-size: var(--fs-h2);
  margin: var(--sp-3) 0 var(--sp-4);
}

.section-lede {
  font-size: var(--fs-body);
  line-height: 1.75;
  color: var(--c-text-soft);
  max-width: 66ch;
}

.section-head--center .section-lede {
  margin: 0 auto;
}

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

/* --------------------------------------------------------------------------
   首屏
   -------------------------------------------------------------------------- */
.hero {
  position: relative;
  padding: var(--sp-10) 0 var(--sp-12);
  overflow: hidden;
  background:
    radial-gradient(680px 340px at 88% -6%, rgba(191, 141, 48, 0.08), transparent 68%),
    radial-gradient(520px 300px at 4% 8%, rgba(48, 152, 191, 0.05), transparent 70%),
    var(--c-bg);
}

.hero__lines {
  position: absolute;
  top: -40px;
  right: -120px;
  width: 780px;
  max-width: 62vw;
  pointer-events: none;
  opacity: 0.75;
  z-index: 0;
}

.hero__lines path {
  fill: none;
  stroke-width: 1.4;
  stroke-linecap: round;
  stroke-dasharray: 1400;
  animation: draw 2.6s var(--ease) both;
}

.hero__lines path:nth-child(1) {
  stroke: #d8a840;
  animation-delay: 0.05s;
}

.hero__lines path:nth-child(2) {
  stroke: #c25b4a;
  animation-delay: 0.25s;
}

.hero__lines path:nth-child(3) {
  stroke: #3098bf;
  animation-delay: 0.45s;
}

.hero__lines path:nth-child(4) {
  stroke: #333333;
  opacity: 0.35;
  animation-delay: 0.6s;
}

@keyframes draw {
  from {
    stroke-dashoffset: 1400;
    opacity: 0;
  }
  to {
    stroke-dashoffset: 0;
    opacity: 1;
  }
}

.hero__inner {
  position: relative;
  z-index: 1;
}

.hero h1 {
  font-size: var(--fs-display);
  letter-spacing: -0.035em;
  margin: var(--sp-4) 0 var(--sp-4);
  max-width: 12em;
}

.hero__lead {
  font-size: clamp(17px, 1.5vw, 20px);
  line-height: 1.75;
  color: var(--c-text-soft);
  max-width: 58ch;
  margin-bottom: var(--sp-8);
}

.hero__lead strong {
  font-weight: 600;
  color: var(--c-text);
  background: linear-gradient(transparent 62%, rgba(191, 141, 48, 0.24) 62%);
  padding: 0 2px;
}

.hero__more {
  margin-top: var(--sp-4);
  font-size: var(--fs-cap);
  color: var(--c-text-muted);
}

.hero__more .link-more {
  color: var(--c-text-soft);
}

.hero__more .link-more:hover {
  color: var(--c-text);
}

.hero__note {
  display: flex;
  flex-wrap: wrap;
  gap: 8px 20px;
  margin-top: var(--sp-4);
  font-size: var(--fs-cap);
  color: var(--c-text-muted);
}

.hero__note span {
  display: inline-flex;
  align-items: center;
  gap: 6px;
}

.hero__note svg {
  color: var(--c-gold-ink);
  flex: none;
}

/* 信任条 */
.trust-bar {
  border-top: 1px solid var(--c-border-soft);
  border-bottom: 1px solid var(--c-border-soft);
  background: rgba(255, 255, 255, 0.5);
}

.trust-bar__inner {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 0;
}

.trust-bar__item {
  padding: 20px 24px;
  display: flex;
  align-items: center;
  gap: 12px;
  font-size: var(--fs-cap);
  color: var(--c-text-muted);
}

.trust-bar__item + .trust-bar__item {
  border-left: 1px solid var(--c-border-soft);
}

.trust-bar__item b {
  display: block;
  font-size: var(--fs-sm);
  font-weight: 600;
  color: var(--c-text);
  letter-spacing: -0.01em;
}

.trust-bar__num {
  font-size: 22px;
  font-weight: 600;
  color: var(--c-text);
  font-variant-numeric: tabular-nums;
  min-width: 2ch;
}

/* --------------------------------------------------------------------------
   转换器
   -------------------------------------------------------------------------- */
.converter {
  position: relative;
  background: var(--c-surface);
  border: 1px solid #dedede;
  border-radius: var(--r-lg);
  box-shadow: var(--shadow-pop);
  overflow: hidden;
}

.converter::before {
  content: "";
  position: absolute;
  inset: 0 0 auto 0;
  height: 3px;
  background: linear-gradient(90deg, var(--c-gold) 0%, var(--c-red) 48%, var(--c-blue) 100%);
  z-index: 2;
}

.converter__head {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: var(--sp-4);
  flex-wrap: wrap;
  padding: var(--sp-5) var(--sp-6);
  border-bottom: 1px solid var(--c-border-soft);
}

.tabs {
  display: inline-flex;
  gap: 2px;
  padding: 4px;
  background: #f1f1f1;
  border-radius: var(--r-full);
}

.tab {
  border: 0;
  background: transparent;
  padding: 9px 16px;
  border-radius: var(--r-full);
  font-size: var(--fs-cap);
  font-weight: 500;
  color: #5c5c5c;
  white-space: nowrap;
  transition: background-color var(--dur-short) var(--ease),
    color var(--dur-short) var(--ease),
    box-shadow var(--dur-short) var(--ease);
}

.tab:hover {
  color: var(--c-text);
}

.tab.is-active {
  background: var(--c-primary);
  color: #fafafa;
  box-shadow: 0 1px 2px rgba(0, 0, 0, 0.12);
}

.converter__meta {
  font-size: var(--fs-xs);
  color: var(--c-text-muted);
  letter-spacing: 0.02em;
  display: inline-flex;
  align-items: center;
  gap: 8px;
}

.converter__dot {
  width: 6px;
  height: 6px;
  border-radius: 50%;
  background: #4caf7d;
  box-shadow: 0 0 0 3px rgba(76, 175, 125, 0.15);
}

.converter__panes {
  display: grid;
  grid-template-columns: 1fr 1fr;
}

.pane {
  min-width: 0;
  padding: var(--sp-5) var(--sp-6) var(--sp-4);
}

.pane--out {
  background: #fbfbfb;
  border-left: 1px solid var(--c-border-soft);
}

.pane__head {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 12px;
  margin-bottom: 10px;
}

.pane__label {
  font-size: var(--fs-cap);
  font-weight: 600;
  letter-spacing: 0.02em;
  color: var(--c-text);
  display: inline-flex;
  align-items: center;
  gap: 8px;
}

.pane__label span {
  font-weight: 400;
  color: var(--c-text-faint);
  font-size: var(--fs-xs);
  letter-spacing: 0.06em;
  text-transform: uppercase;
}

.pane__count {
  font-size: var(--fs-xs);
  color: var(--c-text-faint);
  font-variant-numeric: tabular-nums;
}

.pane__input,
.pane__highlight {
  display: block;
  width: 100%;
  min-height: 168px;
  padding: 16px;
  border: 1px solid #d4d4d4;
  border-radius: var(--r-md);
  background: var(--c-bg);
  font-family: var(--font);
  font-size: 17px;
  line-height: 1.75;
  color: var(--c-text);
  resize: vertical;
  transition: border-color var(--dur-short) var(--ease),
    box-shadow var(--dur-short) var(--ease);
}

.pane__input::placeholder {
  color: #9a9a9a;
}

.pane__input:focus {
  outline: none;
  border-color: var(--c-primary);
  box-shadow: 0 0 0 3px rgba(51, 51, 51, 0.08);
}

.pane__input[readonly] {
  cursor: default;
  background: #ffffff;
}

.pane__highlight {
  display: none;
  white-space: pre-wrap;
  word-break: break-word;
  overflow-wrap: anywhere;
  overflow-y: auto;
}

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

.pane__highlight em {
  font-style: normal;
  background: rgba(191, 141, 48, 0.2);
  color: #6d4a0e;
  border-radius: 2px;
  box-shadow: 0 0 0 1px rgba(191, 141, 48, 0.16);
}

.pane__foot {
  display: flex;
  align-items: center;
  gap: 12px;
  flex-wrap: wrap;
  margin-top: 12px;
  min-height: 34px;
}

.pane__foot .btn {
  flex: none;
}

.linkbtn {
  border: 0;
  background: transparent;
  padding: 6px 2px;
  font-size: var(--fs-cap);
  color: var(--c-text-muted);
  border-radius: var(--r-sm);
  transition: color var(--dur-short) var(--ease);
}

.linkbtn:hover {
  color: var(--c-text);
  text-decoration: underline;
  text-underline-offset: 4px;
}

.linkbtn.is-on {
  color: var(--c-gold-ink);
  font-weight: 500;
}

.converter__options {
  display: flex;
  align-items: center;
  gap: 12px 20px;
  flex-wrap: wrap;
  padding: var(--sp-4) var(--sp-6);
  border-top: 1px solid var(--c-border-soft);
  background: #fdfdfd;
}

.seg {
  display: inline-flex;
  border: 1px solid var(--c-border);
  border-radius: var(--r-full);
  padding: 3px;
  background: #fff;
}

.seg button {
  border: 0;
  background: transparent;
  padding: 6px 13px;
  font-size: var(--fs-xs);
  border-radius: var(--r-full);
  color: #666;
  transition: background-color var(--dur-short) var(--ease),
    color var(--dur-short) var(--ease);
}

.seg button.is-active {
  background: var(--c-primary);
  color: #fafafa;
}

.seg button:disabled {
  opacity: 0.32;
  cursor: not-allowed;
}

.seg.is-disabled {
  opacity: 0.55;
}

.linkbtn:disabled {
  opacity: 0.4;
  cursor: not-allowed;
  text-decoration: none;
}

.switch {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  font-size: var(--fs-cap);
  color: var(--c-text-soft);
  cursor: pointer;
  user-select: none;
}

.switch input {
  appearance: none;
  -webkit-appearance: none;
  width: 34px;
  height: 20px;
  border-radius: var(--r-full);
  background: #dcdcdc;
  position: relative;
  cursor: pointer;
  transition: background-color var(--dur-short) var(--ease);
  flex: none;
}

.switch input::after {
  content: "";
  position: absolute;
  top: 3px;
  left: 3px;
  width: 14px;
  height: 14px;
  border-radius: 50%;
  background: #fff;
  box-shadow: 0 1px 2px rgba(0, 0, 0, 0.2);
  transition: transform var(--dur-short) var(--ease);
}

.switch input:checked {
  background: var(--c-primary);
}

.switch input:checked::after {
  transform: translateX(14px);
}

.converter__spacer {
  flex: 1 1 auto;
}

.converter__stats {
  font-size: var(--fs-xs);
  color: var(--c-text-muted);
  font-variant-numeric: tabular-nums;
  margin-left: auto;
}

.converter__tip {
  display: flex;
  align-items: flex-start;
  gap: 10px;
  padding: 12px var(--sp-6) var(--sp-5);
  font-size: var(--fs-xs);
  line-height: 1.7;
  color: var(--c-text-muted);
  border-top: 1px dashed var(--c-border-soft);
}

.converter__tip svg {
  flex: none;
  margin-top: 2px;
  color: var(--c-gold);
}

.converter__hint {
  display: none;
  align-items: center;
  gap: 10px;
  margin: 0 var(--sp-6) var(--sp-5);
  padding: 10px 14px;
  border: 1px solid rgba(48, 152, 191, 0.28);
  background: rgba(48, 152, 191, 0.06);
  border-radius: var(--r-md);
  font-size: var(--fs-cap);
  color: var(--c-blue-ink);
}

.converter__hint.is-on {
  display: flex;
}

.converter__hint button {
  margin-left: auto;
  border: 1px solid rgba(30, 108, 138, 0.4);
  background: transparent;
  color: var(--c-blue-ink);
  border-radius: var(--r-full);
  padding: 4px 12px;
  font-size: var(--fs-xs);
}

/* 示例标签 */
.chips {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
}

.chip {
  border: 1px solid var(--c-border);
  background: #fff;
  border-radius: var(--r-full);
  padding: 7px 14px;
  font-size: var(--fs-xs);
  color: var(--c-text-soft);
  transition: border-color var(--dur-short) var(--ease),
    color var(--dur-short) var(--ease),
    transform var(--dur-short) var(--ease);
}

.chip:hover {
  border-color: var(--c-primary);
  color: var(--c-primary);
  transform: translateY(-1px);
}

.chip.is-active {
  background: var(--c-primary);
  border-color: var(--c-primary);
  color: #fafafa;
}

/* --------------------------------------------------------------------------
   网格与卡片
   -------------------------------------------------------------------------- */
.grid {
  display: grid;
  gap: var(--sp-6);
}

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

.grid--3 {
  grid-template-columns: repeat(3, minmax(0, 1fr));
}

.grid--4 {
  grid-template-columns: repeat(4, minmax(0, 1fr));
}

.card {
  position: relative;
  background: var(--c-surface);
  border: 1px solid var(--c-border-soft);
  border-radius: var(--r-md);
  padding: var(--sp-6);
  transition: transform var(--dur-short) var(--ease),
    box-shadow var(--dur-short) var(--ease),
    border-color var(--dur-short) var(--ease);
}

.card:hover {
  transform: translateY(-4px);
  box-shadow: 0 10px 24px rgba(51, 51, 51, 0.06);
  border-color: var(--c-border);
}

.card__index {
  font-size: var(--fs-xs);
  letter-spacing: 0.16em;
  color: var(--c-gold-ink);
  font-weight: 600;
}

.card__title {
  font-size: var(--fs-h3);
  margin: 10px 0 10px;
}

.card__text {
  font-size: var(--fs-sm);
  line-height: 1.75;
  color: var(--c-text-soft);
}

.card__foot {
  margin-top: var(--sp-5);
  font-size: var(--fs-cap);
  color: var(--c-text-muted);
}

.card--link {
  display: block;
  color: inherit;
}

.card--link:hover .card__arrow {
  transform: translateX(4px);
}

.card__arrow {
  display: inline-block;
  transition: transform var(--dur-short) var(--ease);
}

.card--accent::after {
  content: "";
  position: absolute;
  left: 24px;
  bottom: 0;
  width: 36px;
  height: 2px;
  background: var(--c-gold);
}

.card-soft {
  background: #f5f5f3;
  border: 1px solid transparent;
  border-radius: var(--r-md);
  padding: var(--sp-6);
}

/* 图标圆点 */
.icon-dot {
  width: 40px;
  height: 40px;
  border-radius: 50%;
  display: grid;
  place-items: center;
  background: #f1efea;
  color: var(--c-gold-ink);
  margin-bottom: var(--sp-4);
}

.icon-dot--blue {
  background: rgba(48, 152, 191, 0.1);
  color: var(--c-blue-ink);
}

/* --------------------------------------------------------------------------
   分栏文本
   -------------------------------------------------------------------------- */
.split {
  display: grid;
  grid-template-columns: minmax(0, 1.05fr) minmax(0, 0.95fr);
  gap: var(--sp-12);
  align-items: start;
}

.prose {
  color: var(--c-text-soft);
  font-size: var(--fs-body);
  line-height: 1.85;
}

.prose > * + * {
  margin-top: var(--sp-5);
}

.prose h2 {
  font-size: var(--fs-h2);
  color: var(--c-text);
  margin-top: var(--sp-10);
  scroll-margin-top: calc(var(--nav-h) + 20px);
}

.prose h3 {
  font-size: var(--fs-h3);
  color: var(--c-text);
  margin-top: var(--sp-8);
}

.prose h4 {
  font-size: var(--fs-h4);
  color: var(--c-text);
  margin-top: var(--sp-6);
}

.prose p {
  margin: 0;
}

.prose strong {
  color: var(--c-text);
  font-weight: 600;
}

.prose ul,
.prose ol {
  padding-left: 1.2em;
  list-style: disc;
}

.prose ol {
  list-style: decimal;
}

.prose li + li {
  margin-top: 8px;
}

.prose blockquote {
  margin: var(--sp-6) 0;
  padding: 4px 0 4px 24px;
  border-left: 2px solid var(--c-gold);
  font-size: var(--fs-h3);
  line-height: 1.5;
  color: var(--c-text);
  font-weight: 500;
  letter-spacing: -0.01em;
}

.prose code {
  font-family: var(--font-mono);
  font-size: 0.9em;
  background: #f1f1ef;
  padding: 2px 6px;
  border-radius: var(--r-sm);
}

.prose a {
  color: var(--c-blue-ink);
  text-decoration: underline;
  text-underline-offset: 3px;
}

.aside-card {
  background: var(--c-surface);
  border: 1px solid var(--c-border-soft);
  border-radius: var(--r-md);
  padding: var(--sp-6);
}

.aside-card + .aside-card {
  margin-top: var(--sp-4);
}

.aside-card__title {
  font-size: var(--fs-h4);
  margin-bottom: var(--sp-3);
}

.aside-list {
  display: grid;
  gap: 10px;
  font-size: var(--fs-cap);
  color: var(--c-text-muted);
}

.aside-list li {
  display: flex;
  gap: 10px;
  line-height: 1.6;
}

.aside-list b {
  color: var(--c-text);
  font-weight: 600;
  font-variant-numeric: tabular-nums;
  flex: none;
}

/* --------------------------------------------------------------------------
   步骤
   -------------------------------------------------------------------------- */
.steps {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: var(--sp-6);
  counter-reset: step;
}

.step {
  position: relative;
  padding-top: var(--sp-6);
  border-top: 1px solid var(--c-border);
}

.step__num {
  display: block;
  font-size: var(--fs-xs);
  letter-spacing: 0.18em;
  color: var(--c-gold-ink);
  font-weight: 600;
  margin-bottom: 10px;
}

.step h3 {
  font-size: var(--fs-h3);
  margin-bottom: 10px;
}

.step p {
  font-size: var(--fs-sm);
  line-height: 1.75;
  color: var(--c-text-soft);
}

/* --------------------------------------------------------------------------
   示例表
   -------------------------------------------------------------------------- */
.table-wrap {
  border: 1px solid var(--c-border-soft);
  border-radius: var(--r-md);
  overflow: hidden;
  background: var(--c-surface);
}

.table-scroll {
  overflow-x: auto;
  -webkit-overflow-scrolling: touch;
}

.example-table {
  width: 100%;
  border-collapse: collapse;
  min-width: 640px;
}

.example-table th {
  text-align: left;
  font-size: var(--fs-xs);
  font-weight: 600;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: var(--c-text-muted);
  background: #f4f4f2;
  padding: 13px 20px;
  border-bottom: 1px solid var(--c-border-soft);
  white-space: nowrap;
}

.example-table td {
  padding: 16px 20px;
  border-bottom: 1px solid var(--c-border-soft);
  font-size: var(--fs-sm);
  line-height: 1.7;
  vertical-align: top;
}

.example-table tr:last-child td {
  border-bottom: 0;
}

.example-table .col-plain {
  color: var(--c-text-soft);
  width: 40%;
}

.example-table .col-mars {
  color: var(--c-text);
  font-weight: 500;
}

.example-table .col-act {
  width: 92px;
  text-align: right;
  white-space: nowrap;
}

.copy-mini {
  border: 1px solid var(--c-border);
  background: #fff;
  border-radius: var(--r-full);
  padding: 5px 12px;
  font-size: var(--fs-xs);
  color: var(--c-text-muted);
  transition: all var(--dur-short) var(--ease);
}

.copy-mini:hover {
  border-color: var(--c-primary);
  color: var(--c-primary);
}

.copy-mini.is-copied {
  background: var(--c-primary);
  border-color: var(--c-primary);
  color: #fff;
}

/* --------------------------------------------------------------------------
   符号库
   -------------------------------------------------------------------------- */
.symbol-toolbar {
  display: flex;
  gap: 12px;
  flex-wrap: wrap;
  align-items: center;
  margin-bottom: var(--sp-8);
}

.search-field {
  position: relative;
  flex: 1 1 260px;
  max-width: 360px;
}

.search-field input {
  width: 100%;
  padding: 12px 16px 12px 42px;
  border: 1px solid var(--c-border);
  border-radius: var(--r-full);
  background: #fff;
  font-size: var(--fs-sm);
  transition: border-color var(--dur-short) var(--ease),
    box-shadow var(--dur-short) var(--ease);
}

.search-field input:focus {
  outline: none;
  border-color: var(--c-primary);
  box-shadow: 0 0 0 3px rgba(51, 51, 51, 0.07);
}

.search-field svg {
  position: absolute;
  left: 15px;
  top: 50%;
  transform: translateY(-50%);
  color: var(--c-text-faint);
  pointer-events: none;
}

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

.symbol-group {
  margin-bottom: var(--sp-10);
}

.symbol-group[hidden] {
  display: none;
}

.symbol-group__head {
  display: flex;
  align-items: baseline;
  justify-content: space-between;
  gap: 16px;
  margin-bottom: var(--sp-4);
  padding-bottom: 10px;
  border-bottom: 1px solid var(--c-border-soft);
}

.symbol-group__head h2 {
  font-size: var(--fs-h3);
}

.symbol-group__head p {
  font-size: var(--fs-cap);
  color: var(--c-text-muted);
}

.symbol-group__count {
  font-size: var(--fs-xs);
  color: var(--c-text-faint);
  font-variant-numeric: tabular-nums;
  flex: none;
}

.symbol-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(64px, 1fr));
  gap: 8px;
}

.symbol-grid--wide {
  grid-template-columns: repeat(auto-fill, minmax(180px, 1fr));
}

.symbol-btn {
  min-height: 56px;
  border: 1px solid var(--c-border-soft);
  background: #fff;
  border-radius: var(--r-md);
  font-size: 22px;
  line-height: 1.2;
  color: var(--c-text);
  display: flex;
  align-items: center;
  justify-content: center;
  padding: 8px;
  transition: transform var(--dur-short) var(--ease),
    border-color var(--dur-short) var(--ease),
    background-color var(--dur-short) var(--ease),
    color var(--dur-short) var(--ease);
  word-break: break-all;
}

.symbol-grid--wide .symbol-btn {
  font-size: 15px;
  justify-content: flex-start;
  padding: 12px 16px;
}

.symbol-btn:hover {
  border-color: var(--c-primary);
  transform: translateY(-2px);
}

.symbol-btn.is-copied {
  background: var(--c-primary);
  border-color: var(--c-primary);
  color: #fff;
}

.symbol-empty {
  display: none;
  padding: 48px 0;
  text-align: center;
  color: var(--c-text-muted);
  font-size: var(--fs-sm);
}

.symbol-empty.is-on {
  display: block;
}

/* --------------------------------------------------------------------------
   昵称 / 签名生成
   -------------------------------------------------------------------------- */
.generator {
  background: var(--c-surface);
  border: 1px solid #dedede;
  border-radius: var(--r-lg);
  box-shadow: var(--shadow-pop);
  padding: var(--sp-6);
}

.generator__row {
  display: grid;
  grid-template-columns: minmax(0, 1fr) 220px auto;
  gap: 12px;
  align-items: end;
}

.field label,
.field__label {
  display: block;
  font-size: var(--fs-cap);
  font-weight: 600;
  margin-bottom: 8px;
}

.field__static {
  width: 100%;
  padding: 12px 14px;
  border: 1px dashed var(--c-border);
  border-radius: var(--r-md);
  background: #f7f7f5;
  font-size: var(--fs-sm);
  color: var(--c-text-muted);
}

.field input,
.field select {
  width: 100%;
  padding: 12px 14px;
  border: 1px solid var(--c-border);
  border-radius: var(--r-md);
  background: #fff;
  font-size: var(--fs-sm);
  transition: border-color var(--dur-short) var(--ease),
    box-shadow var(--dur-short) var(--ease);
}

.field input:focus,
.field select:focus {
  outline: none;
  border-color: var(--c-primary);
  box-shadow: 0 0 0 3px rgba(51, 51, 51, 0.07);
}

.nick-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(220px, 1fr));
  gap: 10px;
  margin-top: var(--sp-6);
}

.nick-card {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 10px;
  padding: 14px 16px;
  border: 1px solid var(--c-border-soft);
  border-radius: var(--r-md);
  background: #fbfbfa;
  min-height: 60px;
}

.nick-card__text {
  font-size: 17px;
  line-height: 1.5;
  word-break: break-word;
}

.nick-card .copy-mini {
  flex: none;
}

/* --------------------------------------------------------------------------
   历史记录
   -------------------------------------------------------------------------- */
.history-panel {
  margin-top: var(--sp-4);
  border: 1px solid var(--c-border-soft);
  border-radius: var(--r-md);
  background: var(--c-surface);
  padding: var(--sp-5);
}

.history-panel__head {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 12px;
  margin-bottom: var(--sp-3);
}

.history-panel__head h2 {
  font-size: var(--fs-h4);
}

.history-list {
  display: grid;
  gap: 8px;
}

.history-item {
  width: 100%;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 12px;
  text-align: left;
  border: 1px solid var(--c-border-soft);
  background: #fff;
  border-radius: var(--r-md);
  padding: 11px 14px;
  transition: border-color var(--dur-short) var(--ease),
    transform var(--dur-short) var(--ease);
}

.history-item:hover {
  border-color: var(--c-primary);
  transform: translateY(-1px);
}

.history-item__text {
  font-size: var(--fs-cap);
  color: var(--c-text);
  overflow: hidden;
  text-overflow: ellipsis;
  white-space: nowrap;
}

.history-item__time {
  flex: none;
  font-size: var(--fs-xs);
  color: var(--c-text-faint);
  font-variant-numeric: tabular-nums;
}

.history-empty {
  font-size: var(--fs-cap);
  color: var(--c-text-muted);
  padding: 8px 0;
}

/* --------------------------------------------------------------------------
   常见问题
   -------------------------------------------------------------------------- */
.faq-list {
  display: grid;
  gap: 10px;
}

.faq {
  background: var(--c-surface);
  border: 1px solid var(--c-border-soft);
  border-radius: var(--r-md);
  overflow: hidden;
  transition: border-color var(--dur-short) var(--ease);
}

.faq[open] {
  border-color: var(--c-border);
}

.faq summary {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 16px;
  padding: 18px 22px;
  font-size: var(--fs-sm);
  font-weight: 600;
  cursor: pointer;
  list-style: none;
}

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

.faq summary::after {
  content: "+";
  font-size: 22px;
  font-weight: 400;
  color: var(--c-text-muted);
  line-height: 1;
  flex: none;
  transition: transform var(--dur-short) var(--ease);
}

.faq[open] summary::after {
  content: "−";
  color: var(--c-text);
}

.faq__body {
  padding: 0 22px 20px;
  font-size: var(--fs-sm);
  line-height: 1.8;
  color: var(--c-text-soft);
  max-width: 78ch;
}

.faq__body p + p {
  margin-top: 10px;
}

/* --------------------------------------------------------------------------
   CTA 区块
   -------------------------------------------------------------------------- */
.cta {
  position: relative;
  overflow: hidden;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: var(--sp-8);
  flex-wrap: wrap;
  padding: var(--sp-12);
  border-radius: var(--r-lg);
  background: var(--c-dark);
  color: var(--c-inverse);
}

.cta::before {
  content: "";
  position: absolute;
  right: -120px;
  top: -160px;
  width: 440px;
  height: 440px;
  border-radius: 50%;
  background: radial-gradient(circle, rgba(191, 141, 48, 0.22), transparent 62%);
  pointer-events: none;
}

.cta__title {
  font-size: clamp(27px, 3vw, 39px);
  margin-bottom: 12px;
}

.cta__text {
  color: #bdbdbd;
  font-size: var(--fs-sm);
  max-width: 46ch;
  line-height: 1.7;
}

.cta__actions {
  display: flex;
  gap: 12px;
  flex-wrap: wrap;
  position: relative;
  z-index: 1;
}

.cta .btn--secondary {
  border-color: rgba(255, 255, 255, 0.45);
  color: #fff;
}

.cta .btn--secondary:hover {
  background: #fff;
  color: var(--c-primary);
}

/* --------------------------------------------------------------------------
   面包屑 / 页首
   -------------------------------------------------------------------------- */
.breadcrumb {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 8px;
  font-size: var(--fs-xs);
  color: var(--c-text-muted);
  padding-top: var(--sp-8);
}

.breadcrumb a:hover {
  color: var(--c-text);
  text-decoration: underline;
  text-underline-offset: 3px;
}

.breadcrumb span[aria-current] {
  color: var(--c-text);
}

.page-head {
  padding: var(--sp-5) 0 var(--sp-8);
}

.page-head h1 {
  font-size: var(--fs-h1);
  margin-bottom: var(--sp-3);
  letter-spacing: -0.03em;
}

.page-head__lead {
  font-size: var(--fs-body);
  line-height: 1.75;
  color: var(--c-text-soft);
  max-width: 72ch;
}

.page-head__meta {
  display: flex;
  flex-wrap: wrap;
  gap: 8px 18px;
  margin-top: var(--sp-4);
  font-size: var(--fs-xs);
  color: var(--c-text-muted);
}

.page-head__meta span {
  display: inline-flex;
  align-items: center;
  gap: 6px;
}

.page-head__meta svg {
  color: var(--c-gold-ink);
}

/* --------------------------------------------------------------------------
   页脚
   -------------------------------------------------------------------------- */
.site-footer {
  background: var(--c-dark);
  color: var(--c-inverse);
  padding: var(--sp-16) 0 var(--sp-8);
  margin-top: var(--sp-16);
}

.footer__top {
  display: grid;
  grid-template-columns: minmax(0, 1.15fr) minmax(0, 1.85fr);
  gap: var(--sp-12);
  padding-bottom: var(--sp-10);
  border-bottom: 1px solid rgba(255, 255, 255, 0.12);
}

.footer__brand .brand__mark {
  background: #fafafa;
  color: var(--c-dark);
}

.footer__name {
  display: flex;
  align-items: center;
  gap: 10px;
  font-size: 20px;
  font-weight: 600;
  letter-spacing: -0.01em;
}

.footer__desc {
  margin-top: var(--sp-4);
  color: #b6b6b6;
  font-size: var(--fs-cap);
  line-height: 1.8;
  max-width: 36ch;
}

.footer__badge {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  margin-top: var(--sp-5);
  padding: 6px 12px;
  border: 1px solid rgba(255, 255, 255, 0.16);
  border-radius: var(--r-full);
  font-size: var(--fs-xs);
  color: #cfcfcf;
}

.footer__badge svg {
  color: #7bc59a;
}

.footer__cols {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: var(--sp-8);
}

.footer__col h2 {
  font-size: var(--fs-xs);
  font-weight: 600;
  letter-spacing: 0.16em;
  text-transform: uppercase;
  color: #d7b673;
  margin-bottom: var(--sp-4);
}

.footer__col ul {
  display: grid;
  gap: 10px;
}

.footer__col a {
  font-size: var(--fs-cap);
  color: #b6b6b6;
  transition: color var(--dur-short) var(--ease);
}

.footer__col a:hover {
  color: #fff;
}

.footer__bottom {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 16px;
  flex-wrap: wrap;
  padding-top: var(--sp-6);
  font-size: var(--fs-xs);
  color: #9a9a9a;
}

.footer__bottom nav {
  display: flex;
  gap: 18px;
  flex-wrap: wrap;
}

.footer__bottom a:hover {
  color: #fff;
}

/* 返回顶部 */
.to-top {
  position: fixed;
  right: 24px;
  bottom: 24px;
  z-index: 40;
  width: 46px;
  height: 46px;
  border-radius: 50%;
  border: 1px solid var(--c-border);
  background: rgba(255, 255, 255, 0.92);
  color: var(--c-text);
  display: grid;
  place-items: center;
  opacity: 0;
  visibility: hidden;
  transform: translateY(8px);
  transition: opacity var(--dur-short) var(--ease),
    transform var(--dur-short) var(--ease),
    visibility var(--dur-short) var(--ease),
    box-shadow var(--dur-short) var(--ease);
  -webkit-backdrop-filter: blur(8px);
  backdrop-filter: blur(8px);
}

.to-top.is-visible {
  opacity: 1;
  visibility: visible;
  transform: translateY(0);
}

.to-top:hover {
  box-shadow: var(--shadow-lift);
}

/* --------------------------------------------------------------------------
   404
   -------------------------------------------------------------------------- */
.error-page {
  padding: var(--sp-16) 0;
  display: grid;
  grid-template-columns: minmax(0, 1fr) minmax(0, 0.8fr);
  gap: var(--sp-12);
  align-items: center;
}

.error-code {
  font-size: clamp(96px, 16vw, 180px);
  font-weight: 600;
  line-height: 0.9;
  letter-spacing: -0.06em;
  color: var(--c-text);
}

.error-code span {
  color: var(--c-gold);
}

.error-list {
  display: grid;
  gap: 10px;
  margin-top: var(--sp-4);
}

.error-list a {
  display: flex;
  justify-content: space-between;
  gap: 12px;
  padding: 12px 0;
  border-bottom: 1px solid var(--c-border-soft);
  font-size: var(--fs-sm);
}

.error-list a:hover {
  color: var(--c-blue-ink);
}

/* --------------------------------------------------------------------------
   提示条 / Toast
   -------------------------------------------------------------------------- */
.toast {
  position: fixed;
  left: 50%;
  bottom: 32px;
  transform: translate(-50%, 16px);
  z-index: 120;
  background: var(--c-dark);
  color: #fff;
  padding: 12px 22px;
  border-radius: var(--r-full);
  font-size: var(--fs-cap);
  opacity: 0;
  visibility: hidden;
  transition: opacity 0.2s var(--ease), transform 0.2s var(--ease),
    visibility 0.2s var(--ease);
  box-shadow: 0 10px 30px rgba(0, 0, 0, 0.18);
  pointer-events: none;
  max-width: calc(100vw - 40px);
  text-align: center;
}

.toast.is-on {
  opacity: 1;
  visibility: visible;
  transform: translate(-50%, 0);
}

/* --------------------------------------------------------------------------
   滚动出现
   -------------------------------------------------------------------------- */
.js .reveal {
  opacity: 0;
  transform: translateY(16px);
  transition: opacity 0.5s var(--ease), transform 0.5s var(--ease);
  will-change: opacity, transform;
}

.js .reveal.is-in {
  opacity: 1;
  transform: none;
}

@media (prefers-reduced-motion: reduce) {
  html {
    scroll-behavior: auto;
  }
  *,
  *::before,
  *::after {
    animation-duration: 0.001ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: 0.001ms !important;
  }
  .js .reveal {
    opacity: 1;
    transform: none;
  }
}

/* --------------------------------------------------------------------------
   平板
   -------------------------------------------------------------------------- */
@media (max-width: 1080px) {
  .container {
    padding: 0 32px;
  }
  .nav__links {
    display: none;
  }
  .nav-toggle {
    display: grid;
  }
  .mobile-nav.is-open {
    display: block;
  }
  .nav__cta {
    display: none;
  }
  .hero__lines {
    max-width: 78vw;
    right: -180px;
    opacity: 0.5;
  }
  .split {
    gap: var(--sp-8);
  }
  .trust-bar__inner {
    grid-template-columns: repeat(2, 1fr);
  }
  .trust-bar__item:nth-child(3) {
    border-left: 0;
    border-top: 1px solid var(--c-border-soft);
  }
  .trust-bar__item:nth-child(4) {
    border-top: 1px solid var(--c-border-soft);
  }
  .footer__top {
    grid-template-columns: 1fr;
    gap: var(--sp-8);
  }
}

/* --------------------------------------------------------------------------
   手机
   -------------------------------------------------------------------------- */
@media (max-width: 860px) {
  :root {
    --fs-h2: 30px;
    --fs-h3: 22px;
  }
  .section {
    padding: var(--sp-12) 0;
  }
  .container {
    padding: 0 24px;
  }
  .mobile-nav {
    padding-left: 24px;
    padding-right: 24px;
  }
  .hero {
    padding: var(--sp-6) 0 var(--sp-10);
  }
  .hero h1 {
    max-width: none;
    margin-top: var(--sp-3);
  }
  .hero__lead {
    margin-bottom: var(--sp-6);
  }
  .hero__lines {
    display: none;
  }
  .converter__panes {
    grid-template-columns: 1fr;
  }
  .pane--out {
    border-left: 0;
    border-top: 1px solid var(--c-border-soft);
  }
  .converter__head,
  .pane,
  .converter__options,
  .converter__tip {
    padding-left: var(--sp-4);
    padding-right: var(--sp-4);
  }
  .converter__hint {
    margin-left: var(--sp-4);
    margin-right: var(--sp-4);
  }
  .tabs {
    width: 100%;
  }
  .tab {
    flex: 1 1 0;
    text-align: center;
    padding: 9px 8px;
  }
  .converter__meta {
    display: none;
  }
  .grid--2,
  .grid--3,
  .grid--4 {
    grid-template-columns: 1fr;
  }
  .steps {
    grid-template-columns: 1fr;
    gap: var(--sp-8);
  }
  .split {
    grid-template-columns: 1fr;
  }
  .cta {
    padding: var(--sp-8);
  }
  .error-page {
    grid-template-columns: 1fr;
    gap: var(--sp-8);
    padding: var(--sp-10) 0;
  }
  .footer__cols {
    grid-template-columns: repeat(2, minmax(0, 1fr));
    gap: var(--sp-8);
  }
  .generator__row {
    grid-template-columns: 1fr;
  }
  .site-footer {
    margin-top: var(--sp-12);
    padding-top: var(--sp-12);
  }
  .symbol-group__head {
    flex-direction: column;
    gap: 4px;
  }
  .example-table td,
  .example-table th {
    padding: 13px 14px;
  }
  .prose {
    font-size: 17px;
  }
  .footer__bottom {
    flex-direction: column;
    align-items: flex-start;
  }
}

@media (max-width: 480px) {
  .container {
    padding: 0 20px;
  }
  .mobile-nav {
    padding-left: 20px;
    padding-right: 20px;
  }
  .brand__name {
    font-size: 17px;
  }
  .brand__sub {
    letter-spacing: 0.18em;
  }
  .trust-bar__inner {
    grid-template-columns: 1fr;
  }
  .trust-bar__item + .trust-bar__item {
    border-left: 0;
    border-top: 1px solid var(--c-border-soft);
  }
  .trust-bar__item:nth-child(3) {
    border-top: 1px solid var(--c-border-soft);
  }
  .converter__stats {
    margin-left: 0;
    width: 100%;
  }
  .symbol-grid {
    grid-template-columns: repeat(auto-fill, minmax(56px, 1fr));
  }
  .nick-grid {
    grid-template-columns: 1fr;
  }
  .footer__cols {
    grid-template-columns: 1fr;
  }
  .to-top {
    right: 16px;
    bottom: 16px;
  }
}

/* --------------------------------------------------------------------------
   打印
   -------------------------------------------------------------------------- */
@media print {
  .site-header,
  .site-footer,
  .to-top,
  .converter__options,
  .cta,
  .nav-toggle {
    display: none !important;
  }
  body {
    background: #fff;
  }
  .converter {
    box-shadow: none;
  }
  .reveal {
    opacity: 1 !important;
    transform: none !important;
  }
}

/* --------------------------------------------------------------------------
   内容补充组件
   -------------------------------------------------------------------------- */
.card--wide {
  padding: var(--sp-8);
}

.example-line {
  margin-top: var(--sp-4);
  padding: 10px 14px;
  background: #f6f6f4;
  border-left: 2px solid var(--c-gold);
  border-radius: var(--r-sm);
  font-size: var(--fs-cap);
  line-height: 1.75;
  color: var(--c-text-soft);
  word-break: break-word;
}

.check-list {
  display: grid;
  gap: 14px;
  margin-top: var(--sp-4);
}

.check-list li {
  position: relative;
  padding-left: 26px;
  font-size: var(--fs-sm);
  line-height: 1.75;
  color: var(--c-text-soft);
}

.check-list li::before {
  content: "";
  position: absolute;
  left: 0;
  top: 9px;
  width: 8px;
  height: 8px;
  border-radius: 50%;
  background: var(--c-gold);
}

.check-list li b {
  color: var(--c-text);
  font-weight: 600;
}

.check-list--warn li::before {
  background: var(--c-red);
}

@media (max-width: 860px) {
  .card--wide {
    padding: var(--sp-6);
  }
}

/* --------------------------------------------------------------------------
   工具页附加区块
   -------------------------------------------------------------------------- */
.tool-extras {
  display: grid;
  grid-template-columns: minmax(0, 1.5fr) minmax(0, 0.9fr);
  gap: var(--sp-4);
  margin-top: var(--sp-4);
}

.tool-extras .card {
  padding: var(--sp-5);
}

.tool-extras h2 {
  font-size: var(--fs-h4);
  margin-bottom: 10px;
}

.tool-extras p {
  font-size: var(--fs-cap);
  color: var(--c-text-muted);
  line-height: 1.7;
}

.btn-row {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  margin-top: var(--sp-3);
}

.tool-extras .chips {
  margin-top: var(--sp-2);
}

/* 案例卡片 */
.case-grid {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: var(--sp-4);
}

.case {
  background: var(--c-surface);
  border: 1px solid var(--c-border-soft);
  border-radius: var(--r-md);
  padding: var(--sp-5);
  transition: border-color var(--dur-short) var(--ease),
    transform var(--dur-short) var(--ease);
}

.case:hover {
  border-color: var(--c-border);
  transform: translateY(-2px);
}

.case__label {
  display: inline-block;
  font-size: var(--fs-xs);
  letter-spacing: 0.12em;
  color: var(--c-gold-ink);
  font-weight: 600;
  margin-bottom: 10px;
}

.case__plain {
  font-size: var(--fs-sm);
  color: var(--c-text-soft);
  line-height: 1.7;
}

.case__arrow {
  color: var(--c-gold);
  margin: 8px 0;
  font-size: 14px;
}

.case__mars {
  font-size: 18px;
  line-height: 1.7;
  color: var(--c-text);
  font-weight: 500;
  word-break: break-word;
}

.case__actions {
  display: flex;
  gap: 10px;
  margin-top: var(--sp-3);
  flex-wrap: wrap;
}

/* 目录 */
.toc {
  background: var(--c-surface);
  border: 1px solid var(--c-border-soft);
  border-radius: var(--r-md);
  padding: var(--sp-5) var(--sp-6);
}

.toc__title {
  font-size: var(--fs-xs);
  letter-spacing: 0.16em;
  text-transform: uppercase;
  color: var(--c-gold-ink);
  font-weight: 600;
  margin-bottom: var(--sp-3);
}

.toc ol {
  list-style: none;
  padding: 0;
  display: grid;
  gap: 8px;
  counter-reset: toc;
}

.toc li {
  counter-increment: toc;
  display: flex;
  gap: 10px;
  font-size: var(--fs-cap);
  line-height: 1.6;
}

.toc li::before {
  content: counter(toc, decimal-leading-zero);
  color: var(--c-text-faint);
  font-size: var(--fs-xs);
  font-variant-numeric: tabular-nums;
  padding-top: 2px;
}

.toc a {
  color: var(--c-text-soft);
}

.toc a:hover {
  color: var(--c-blue-ink);
  text-decoration: underline;
  text-underline-offset: 3px;
}

/* 提示框 */
.callout {
  background: #fbf8f1;
  border: 1px solid #eee0c4;
  border-left: 2px solid var(--c-gold);
  border-radius: var(--r-md);
  padding: 18px 20px;
  font-size: var(--fs-sm);
  line-height: 1.8;
  color: #57492f;
  margin: var(--sp-5) 0;
}

.callout strong {
  color: #3f341f;
}

.callout--blue {
  background: #f1f8fb;
  border-color: #d3e6ed;
  border-left-color: var(--c-blue);
  color: #2c4f5e;
}

.callout p + p {
  margin-top: 8px;
}

.kbd {
  display: inline-block;
  border: 1px solid var(--c-border);
  border-bottom-width: 2px;
  border-radius: 3px;
  padding: 0 6px;
  font-size: var(--fs-xs);
  line-height: 1.7;
  background: #fff;
  font-family: var(--font-mono);
  color: var(--c-text);
}

/* 生成器结果区 */
.generator + .generator {
  margin-top: var(--sp-6);
}

.gen-head {
  display: flex;
  align-items: baseline;
  justify-content: space-between;
  gap: 16px;
  flex-wrap: wrap;
  margin-bottom: var(--sp-4);
}

.gen-head h2 {
  font-size: var(--fs-h3);
}

.gen-head p {
  font-size: var(--fs-cap);
  color: var(--c-text-muted);
}

@media (max-width: 860px) {
  .pane__kbdhint {
    display: none;
  }
  .pane__input,
  .pane__highlight {
    height: 168px;
    min-height: 168px;
    resize: none;
  }
  .tool-extras {
    grid-template-columns: 1fr;
  }
  .case-grid {
    grid-template-columns: 1fr;
  }
}

/* 标题均衡断行（支持的浏览器） */
.section-title,
.page-head h1,
.cta__title,
.error-page h1 {
  text-wrap: balance;
}

.lede,
.section-lede,
.hero__lead,
.page-head__lead {
  text-wrap: pretty;
}

/* 介于平板与桌面之间的宽度：减少三列卡片带来的拥挤 */
@media (max-width: 980px) and (min-width: 861px) {
  .grid--3,
  .grid--4 {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }
  .split {
    grid-template-columns: 1fr;
    gap: var(--sp-8);
  }
}