:root {
  color-scheme: light;
  --bg: #f6f8f4;
  --bg-soft: #eaf0eb;
  --ink: #101815;
  --muted: rgba(16, 24, 21, 0.62);
  --faint: rgba(16, 24, 21, 0.1);
  --line: rgba(16, 24, 21, 0.15);
  --cyan: #007f91;
  --green: #9eea3d;
  --steel: #637676;
  --shadow: rgba(24, 41, 38, 0.14);
  --max: 1180px;
}

* {
  box-sizing: border-box;
}

/* 静态资源兜底：即使缓存混用/样式未就绪，图片与 logo 也不会以原图尺寸撑开布局 */
img {
  max-width: 100%;
  height: auto;
}
.brand-mark {
  flex: 0 0 auto;
}
.brand img,
.brand svg {
  height: 24px;
  width: auto;
  flex: 0 0 auto;
}

html {
  min-width: 320px;
  scroll-behavior: smooth;
}

body {
  margin: 0;
  min-width: 320px;
  min-height: 100vh;
  overflow-x: hidden;
  background:
    radial-gradient(circle at 66% 40%, rgba(0, 127, 145, 0.12), transparent 30rem),
    radial-gradient(circle at 18% 15%, rgba(158, 234, 61, 0.12), transparent 22rem),
    linear-gradient(180deg, #fbfcf7 0%, #f3f7f1 55%, #e8efea 100%);
  color: var(--ink);
  font-family:
    "Spline Sans",
    "Space Grotesk",
    "Segoe UI",
    "PingFang SC",
    "Microsoft YaHei",
    "Noto Sans SC",
    "Hiragino Sans GB",
    Arial,
    sans-serif;
  letter-spacing: 0;
}

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

#particle-field {
  position: fixed;
  inset: 0;
  z-index: 0;
  width: 100vw;
  height: 100vh;
  background: #f6f8f4;
}

.grain,
.scanline {
  position: fixed;
  inset: 0;
  z-index: 1;
  pointer-events: none;
}

.grain {
  opacity: 0.28;
  background-image:
    linear-gradient(rgba(16, 24, 21, 0.035) 1px, transparent 1px),
    linear-gradient(90deg, rgba(16, 24, 21, 0.026) 1px, transparent 1px);
  background-size: 48px 48px, 48px 48px;
  mask-image: linear-gradient(180deg, rgba(0, 0, 0, 0.2), #000 34%, #000 80%, transparent);
}

.scanline {
  opacity: 0.12;
  background: linear-gradient(
    180deg,
    transparent 0,
    transparent 7px,
    rgba(16, 24, 21, 0.035) 8px,
    transparent 9px
  );
  background-size: 100% 9px;
}

.site-header,
.hero,
.home-overview,
.capability-section,
.process-band,
.cta-band,
.site-footer {
  position: relative;
  z-index: 2;
}

.site-header {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  z-index: 10;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 24px;
  width: min(100% - 48px, var(--max));
  height: 72px;
  margin: 0 auto;
  color: rgba(16, 24, 21, 0.86);
}

.brand,
.nav-links {
  display: flex;
  align-items: center;
  gap: 12px;
}

.brand {
  min-height: 44px;
  font-size: 0.78rem;
  font-weight: 700;
}

.brand-mark {
  width: 14px;
  height: 14px;
  border: 1px solid var(--cyan);
  background: var(--green);
  box-shadow: 0 0 26px rgba(126, 204, 30, 0.32);
}

.nav-links {
  gap: 6px;
  padding: 5px;
  border: 1px solid rgba(16, 24, 21, 0.12);
  background: rgba(251, 252, 247, 0.66);
  backdrop-filter: blur(18px);
}

.nav-links a {
  display: inline-flex;
  align-items: center;
  min-height: 40px;
  padding: 0 14px;
  color: rgba(16, 24, 21, 0.66);
  font-size: 0.82rem;
  transition:
    color 180ms ease,
    background 180ms ease;
}

.nav-links a:hover,
.nav-links a:focus-visible {
  color: var(--ink);
  background: rgba(16, 24, 21, 0.06);
  outline: none;
}

.hero {
  display: grid;
  grid-template-columns: minmax(0, 1fr) 300px;
  align-items: center;
  gap: 48px;
  width: min(100% - 48px, var(--max));
  margin: 0 auto;
  padding: 118px 0 60px;
}

.hero-copy {
  position: relative;
  max-width: 680px;
  text-shadow:
    0 1px 0 rgba(255, 255, 255, 0.88),
    0 18px 44px rgba(255, 255, 255, 0.52);
}

.kicker {
  margin: 0 0 18px;
  color: var(--cyan);
  font-family: "Spline Sans Mono", Consolas, monospace;
  font-size: clamp(0.72rem, 1.4vw, 0.84rem);
  text-transform: uppercase;
}

.hero h1,
.section-label h2,
.capability-intro h2,
.process-copy h2,
.cta-band h2 {
  margin: 0;
  letter-spacing: 0;
  text-wrap: balance;
}

.hero h1 {
  max-width: 820px;
  font-size: clamp(2.7rem, 8vw, 6rem);
  font-weight: 700;
  line-height: 1.04;
  letter-spacing: 0.01em;
}

.hero h1 span {
  display: block;
}

.hero h1 em {
  font-style: normal;
  color: var(--cyan);
}

.hero-text {
  max-width: 600px;
  margin: 30px 0 0;
  color: var(--muted);
  font-size: clamp(1rem, 1.8vw, 1.18rem);
  line-height: 1.7;
  text-wrap: pretty;
}

.hero-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  margin-top: 36px;
}

.primary-action,
.secondary-action {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-height: 48px;
  padding: 0 20px;
  border: 1px solid var(--line);
  font-weight: 700;
  transition:
    transform 180ms ease,
    border-color 180ms ease,
    background 180ms ease;
}

.primary-action {
  background: var(--ink);
  color: #f7faf3;
}

.secondary-action {
  background: rgba(251, 252, 247, 0.54);
  color: var(--ink);
}

.primary-action:hover,
.primary-action:focus-visible,
.secondary-action:hover,
.secondary-action:focus-visible {
  transform: translateY(-2px);
  border-color: rgba(0, 127, 145, 0.54);
  outline: none;
}

.telemetry {
  display: grid;
  gap: 1px;
  border: 1px solid var(--line);
  background: rgba(16, 24, 21, 0.1);
  box-shadow: 0 24px 80px var(--shadow);
}

.telemetry div {
  display: grid;
  gap: 10px;
  min-height: 76px;
  padding: 16px;
  background: rgba(251, 252, 247, 0.72);
  backdrop-filter: blur(16px);
}

.telemetry span,
.metric-row span,
.capability-card span,
.process-list span,
.section-label span {
  color: var(--steel);
  font-family: "Spline Sans Mono", Consolas, monospace;
  font-size: 0.72rem;
}

.telemetry strong {
  color: var(--ink);
  font-size: 0.98rem;
}

.home-overview,
.capability-section,
.process-band,
.cta-band {
  width: min(100% - 48px, var(--max));
  margin: 0 auto;
  padding: 44px 0;
  border-top: 1px solid var(--line);
}

.section-label {
  display: grid;
  grid-template-columns: 180px minmax(0, 1fr);
  gap: 32px;
  align-items: start;
  margin-bottom: 26px;
}

.section-label h2,
.capability-intro h2,
.process-copy h2,
.cta-band h2 {
  max-width: 760px;
  font-size: clamp(1.8rem, 3.4vw, 3.3rem);
  line-height: 1.04;
}

.overview-panel {
  display: grid;
  grid-template-columns: minmax(0, 0.92fr) minmax(420px, 1.08fr);
  gap: 1px;
  background: rgba(16, 24, 21, 0.1);
  border: 1px solid var(--line);
}

.overview-lead {
  min-height: 0;
  margin: 0;
  padding: 34px;
  background: rgba(251, 252, 247, 0.68);
  color: rgba(16, 24, 21, 0.78);
  font-size: clamp(1.45rem, 3vw, 2.8rem);
  font-weight: 700;
  line-height: 1.12;
  text-wrap: balance;
}

.metric-row {
  display: grid;
  gap: 1px;
  background: rgba(16, 24, 21, 0.1);
}

.metric-row div {
  display: grid;
  grid-template-columns: 58px minmax(0, 0.8fr) minmax(180px, 1fr);
  gap: 20px;
  align-items: start;
  min-height: 120px;
  padding: 28px;
  background: rgba(251, 252, 247, 0.72);
}

.metric-row strong,
.capability-card h3,
.process-list strong {
  color: var(--ink);
}

.metric-row strong {
  font-size: clamp(1.2rem, 1.8vw, 1.7rem);
  line-height: 1.08;
}

.metric-row p,
.capability-card p,
.process-list p {
  margin: 0;
  color: var(--muted);
  line-height: 1.65;
}

.capability-section {
  display: grid;
  grid-template-columns: minmax(260px, 0.72fr) minmax(0, 1.28fr);
  gap: 48px;
  align-items: start;
}

.capability-intro {
  padding-top: 4px;
}

.capability-stack {
  display: grid;
  gap: 1px;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  background: rgba(16, 24, 21, 0.1);
  border: 1px solid var(--line);
}

.capability-card {
  display: grid;
  align-content: space-between;
  gap: 28px;
  min-height: 190px;
  padding: 28px;
  background: rgba(251, 252, 247, 0.68);
}

.capability-card-large {
  grid-column: 1 / -1;
  min-height: 180px;
}

.capability-card-all {
  grid-column: 1 / -1;
  min-height: auto;
  gap: 12px;
}

.capability-card-all h3 {
  font-size: clamp(1.35rem, 2.4vw, 2rem);
}

.capability-card-all p {
  max-width: 40rem;
}

.capability-card h3 {
  max-width: 620px;
  margin: 0;
  font-size: clamp(1.55rem, 2.8vw, 3.4rem);
  line-height: 0.98;
  text-wrap: balance;
}

.capability-card p {
  max-width: 34rem;
}

.process-band {
  display: grid;
  grid-template-columns: minmax(0, 0.85fr) minmax(420px, 1.15fr);
  gap: 48px;
}

.process-list {
  display: grid;
  gap: 1px;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  padding: 0;
  margin: 0;
  list-style: none;
  background: rgba(16, 24, 21, 0.1);
  border: 1px solid var(--line);
}

.process-list li {
  min-height: 0;
  padding: 24px;
  background: rgba(251, 252, 247, 0.68);
}

.process-list strong {
  display: block;
  margin: 30px 0 12px;
  font-size: clamp(1.35rem, 2.2vw, 2.1rem);
  line-height: 1;
}

.cta-band {
  display: flex;
  align-items: end;
  justify-content: space-between;
  gap: 48px;
  padding-bottom: 60px;
}

.cta-band > div {
  max-width: 760px;
}

.site-footer {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 24px;
  width: min(100% - 48px, var(--max));
  margin: 0 auto;
  padding: 32px 0 44px;
  color: var(--muted);
  border-top: 1px solid var(--line);
}

.site-footer p {
  margin: 0;
}

.site-footer a {
  min-height: 44px;
  display: inline-flex;
  align-items: center;
  color: var(--cyan);
}

@media (max-width: 880px) {
  .site-header {
    width: min(100% - 32px, var(--max));
  }

  .nav-links {
    display: none;
  }

  .hero {
    grid-template-columns: 1fr;
    width: min(100% - 32px, var(--max));
    min-height: auto;
    padding: 104px 0 42px;
  }

  .hero h1 {
    font-size: clamp(2.4rem, 11.8vw, 3.7rem);
    line-height: 1.05;
  }

  .telemetry {
    grid-template-columns: 1fr;
    max-width: 380px;
  }

  .home-overview,
  .capability-section,
  .process-band,
  .cta-band,
  .site-footer {
    width: min(100% - 32px, var(--max));
  }

  .section-label,
  .overview-panel,
  .capability-section,
  .process-band {
    grid-template-columns: 1fr;
    gap: 24px;
  }

  .overview-lead {
    min-height: auto;
    padding: 28px;
  }

  .metric-row div {
    grid-template-columns: 48px minmax(0, 1fr);
  }

  .metric-row p {
    grid-column: 2;
  }

  .capability-stack,
  .process-list {
    grid-template-columns: 1fr;
  }

  .capability-card,
  .capability-card-large,
  .process-list li {
    min-height: auto;
  }

  .process-list strong {
    margin-top: 42px;
  }

  .cta-band {
    align-items: flex-start;
    flex-direction: column;
    padding-bottom: 64px;
  }
}

@media (max-width: 540px) {
  .hero-text {
    max-width: 20rem;
    margin-top: 24px;
    font-size: 0.98rem;
    line-height: 1.62;
  }

  .hero-actions {
    flex-direction: column;
    margin-top: 30px;
  }

  .primary-action,
  .secondary-action {
    width: 100%;
  }

  .telemetry {
    display: none;
  }

  .telemetry div,
  .metric-row div {
    grid-template-columns: 1fr;
    gap: 8px;
  }

  .metric-row p {
    grid-column: auto;
  }

  .capability-card,
  .process-list li {
    padding: 24px;
  }

  .capability-card {
    gap: 32px;
  }

  .overview-lead {
    font-size: clamp(1.35rem, 8vw, 2rem);
  }

  .site-footer {
    align-items: flex-start;
    flex-direction: column;
  }
}

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

  *,
  *::before,
  *::after {
    animation-duration: 1ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: 1ms !important;
  }
}

/* ============ 导航（分主题下拉 + 移动汉堡） ============ */
.menu-toggle {
  display: none;
  align-items: center;
  gap: 8px;
  min-height: 44px;
  padding: 0 14px;
  border: 1px solid rgba(16, 24, 21, 0.16);
  background: rgba(251, 252, 247, 0.7);
  backdrop-filter: blur(18px);
  color: var(--ink);
  font: inherit;
  font-size: 0.85rem;
  font-weight: 700;
  cursor: pointer;
}

.nav-item {
  position: relative;
  display: inline-flex;
}

.nav-trigger {
  display: inline-flex;
  align-items: center;
  gap: 5px;
  min-height: 40px;
  padding: 0 14px;
  border: 0;
  background: transparent;
  color: rgba(16, 24, 21, 0.66);
  font: inherit;
  font-size: 0.82rem;
  cursor: pointer;
}

.nav-trigger:hover,
.nav-item:hover .nav-trigger,
.nav-item:focus-within .nav-trigger {
  color: var(--ink);
}

.dropdown {
  position: absolute;
  top: calc(100% + 10px);
  left: 50%;
  transform: translateX(-50%) translateY(6px);
  width: min(660px, 88vw);
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 1px;
  padding: 1px;
  background: rgba(16, 24, 21, 0.12);
  border: 1px solid var(--line);
  box-shadow: 0 30px 90px var(--shadow);
  opacity: 0;
  visibility: hidden;
  transition: opacity 160ms ease, transform 160ms ease;
  z-index: 20;
}

.nav-item:hover .dropdown,
.nav-item:focus-within .dropdown {
  opacity: 1;
  visibility: visible;
  transform: translateX(-50%) translateY(0);
}

.dd-group {
  display: grid;
  align-content: start;
  gap: 4px;
  padding: 18px 18px 20px;
  background: rgba(251, 252, 247, 0.96);
}

.dd-group > span {
  margin-bottom: 6px;
  color: var(--steel);
  font-family: "Spline Sans Mono", Consolas, monospace;
  font-size: 0.68rem;
  text-transform: uppercase;
  letter-spacing: 0.06em;
}

.dd-group a {
  display: block;
  padding: 6px 0;
  color: rgba(16, 24, 21, 0.74);
  font-size: 0.86rem;
  line-height: 1.4;
}

.dd-group a:hover {
  color: var(--cyan);
}

.dd-all {
  grid-column: 1 / -1;
  padding: 14px 18px;
  background: var(--ink);
  color: #f2f6ee;
  font-size: 0.82rem;
  font-weight: 700;
}

.dd-all:hover {
  color: var(--green);
}

.reg-cta {
  background: var(--ink) !important;
  color: #f4f8ee !important;
  font-weight: 700;
  padding: 0 16px !important;
  border: 1px solid var(--ink);
}

.reg-cta:hover,
.reg-cta:focus-visible {
  background: #1c2a25 !important;
  color: var(--green) !important;
}

/* ============ 首屏转化卡（邀请码 + 减免 + 注册直链） ============ */
.convert {
  display: grid;
  gap: 15px;
  padding: 22px 22px 20px;
  border: 1px solid var(--line);
  background: rgba(251, 252, 247, 0.86);
  backdrop-filter: blur(16px);
  box-shadow: 0 24px 80px var(--shadow);
}

.convert-kicker {
  margin: 0;
  color: var(--cyan);
  font-family: "Spline Sans Mono", Consolas, monospace;
  font-size: 0.72rem;
  text-transform: uppercase;
  letter-spacing: 0.05em;
}

.convert-title {
  margin: -4px 0 2px;
  font-size: 1.02rem;
  font-weight: 700;
  line-height: 1.35;
}

.code-row {
  display: flex;
  align-items: stretch;
  border: 1px solid rgba(16, 24, 21, 0.24);
  background: #fff;
}

.code-label {
  display: flex;
  align-items: center;
  padding: 0 12px;
  border-right: 1px solid rgba(16, 24, 21, 0.14);
  color: var(--steel);
  font-family: "Spline Sans Mono", Consolas, monospace;
  font-size: 0.7rem;
}

.code {
  flex: 1;
  display: flex;
  align-items: center;
  padding: 12px 12px;
  font-family: "Spline Sans Mono", Consolas, monospace;
  font-size: 1.16rem;
  font-weight: 700;
  letter-spacing: 0.06em;
  color: var(--ink);
}

.copy-btn {
  display: inline-flex;
  align-items: center;
  min-width: 62px;
  justify-content: center;
  padding: 0 14px;
  border: 0;
  border-left: 1px solid rgba(16, 24, 21, 0.14);
  background: var(--bg-soft);
  color: var(--ink);
  font: inherit;
  font-size: 0.8rem;
  font-weight: 700;
  cursor: pointer;
  transition: background 160ms ease, color 160ms ease;
}

.copy-btn:hover {
  background: var(--ink);
  color: var(--green);
}

.copy-btn.copied {
  background: var(--cyan);
  color: #fff;
}

.discount {
  display: flex;
  align-items: baseline;
  gap: 8px;
  padding: 2px 0 0;
}

.discount b {
  font-size: 1.85rem;
  line-height: 1;
  color: var(--cyan);
}

.discount span {
  color: var(--muted);
  font-size: 0.9rem;
}

.reg-btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-height: 50px;
  padding: 0 20px;
  background: var(--ink);
  color: #f4f8ee;
  border: 1px solid var(--ink);
  font-weight: 700;
  font-size: 1rem;
  transition: transform 160ms ease, background 160ms ease, color 160ms ease;
}

.reg-btn:hover,
.reg-btn:focus-visible {
  transform: translateY(-2px);
  background: #1c2a25;
  color: var(--green);
  outline: none;
}

.footnote {
  margin: 0;
  color: var(--steel);
  font-size: 0.72rem;
  line-height: 1.5;
}

@media (max-width: 880px) {
  .menu-toggle {
    display: inline-flex;
  }

  .nav-links {
    position: absolute;
    top: 64px;
    right: 0;
    left: 0;
    flex-direction: column;
    align-items: stretch;
    gap: 2px;
    padding: 10px;
    border: 1px solid var(--line);
    background: rgba(251, 252, 247, 0.98);
    backdrop-filter: blur(20px);
    box-shadow: 0 24px 60px var(--shadow);
    max-height: calc(100vh - 72px);
    overflow-y: auto;
    overscroll-behavior: contain;
  }

  .nav-links.open {
    display: flex;
  }

  .nav-item {
    display: block;
  }

  .nav-trigger {
    width: 100%;
    justify-content: space-between;
  }

  .dropdown {
    position: static;
    transform: none;
    width: 100%;
    grid-template-columns: 1fr;
    display: none;
    opacity: 1;
    visibility: visible;
    box-shadow: none;
    border: 0;
    background: transparent;
    padding: 0 0 0 10px;
  }

  .nav-item.open > .dropdown {
    display: grid;
  }

  .nav-links a,
  .nav-trigger {
    min-height: 44px;
  }

  .dd-group {
    padding: 8px 0;
    background: transparent;
  }

  .reg-cta {
    justify-content: center;
    margin-top: 4px;
  }

  .hero-copy {
    order: 2;
  }

  .hero .convert {
    order: 1;
    max-width: 460px;
  }
}

/* ============ 紧凑分组索引区（宽内链枢纽） ============ */
.index-band {
  width: min(100% - 48px, var(--max));
  margin: 0 auto;
  padding: 44px 0;
  border-top: 1px solid var(--line);
}

.index-grid {
  display: grid;
  grid-template-columns: repeat(4, minmax(0, 1fr));
  gap: 1px;
  background: rgba(16, 24, 21, 0.1);
  border: 1px solid var(--line);
}

.index-col {
  display: grid;
  align-content: start;
  gap: 7px;
  padding: 24px 22px 26px;
  background: rgba(251, 252, 247, 0.7);
}

.index-head {
  margin-bottom: 5px;
  color: var(--steel);
  font-family: "Spline Sans Mono", Consolas, monospace;
  font-size: 0.7rem;
  text-transform: uppercase;
  letter-spacing: 0.05em;
}

.index-col a {
  color: rgba(16, 24, 21, 0.76);
  font-size: 0.9rem;
  line-height: 1.45;
}

.index-col a:hover {
  color: var(--cyan);
}

/* 精选卡 / 工具列表里的链接沿用正文色，hover 提示 */
.capability-card h3 a,
.process-list strong a {
  color: inherit;
}

.capability-card h3 a:hover,
.process-list strong a:hover {
  color: var(--cyan);
}

.cta-band .hero-text strong {
  color: var(--ink);
  font-family: "Spline Sans Mono", Consolas, monospace;
}

/* ============ 语言切换器（下拉） ============ */
.lang-switch {
  margin-left: 4px;
}

.lang-trigger {
  gap: 4px;
}

.lang-dropdown {
  left: auto;
  right: 0;
  width: 168px;
  grid-template-columns: 1fr;
  transform: translateX(0) translateY(6px);
}

.nav-item.lang-switch:hover .lang-dropdown,
.nav-item.lang-switch:focus-within .lang-dropdown {
  transform: translateX(0) translateY(0);
}

.lang-dropdown a {
  padding: 11px 16px;
  background: rgba(251, 252, 247, 0.96);
  color: rgba(16, 24, 21, 0.74);
  font-size: 0.88rem;
}

.lang-dropdown a.active {
  color: var(--ink);
  font-weight: 700;
}

.lang-dropdown a:hover,
.lang-dropdown a:focus-visible {
  color: var(--cyan);
  outline: none;
}

@media (max-width: 880px) {
  .lang-switch {
    margin-left: 0;
  }

  .lang-dropdown {
    position: static;
    width: 100%;
    right: auto;
    transform: none;
  }
}

/* ============ 页脚链接 ============ */
.footer-links {
  display: flex;
  flex-wrap: wrap;
  gap: 18px;
}

.footer-links a {
  min-height: 44px;
  display: inline-flex;
  align-items: center;
  color: rgba(16, 24, 21, 0.7);
  font-size: 0.88rem;
}

.footer-links a:hover {
  color: var(--cyan);
}

@media (max-width: 880px) {
  .index-band {
    width: min(100% - 32px, var(--max));
  }

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

@media (max-width: 540px) {
  .index-grid {
    grid-template-columns: 1fr;
  }
}

/* ============ 阅读版面（文章 / 工具 / 列表 / 合规页） ============ */
.reading {
  position: relative;
  z-index: 2;
  width: min(100% - 48px, 940px);
  margin: 0 auto;
  padding: 104px 0 48px;
}

.breadcrumb {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  margin-bottom: 18px;
  color: var(--steel);
  font-family: "Spline Sans Mono", Consolas, monospace;
  font-size: 0.74rem;
}

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

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

.surface {
  background: rgba(252, 253, 249, 0.95);
  border: 1px solid var(--line);
  box-shadow: 0 30px 90px var(--shadow);
  padding: clamp(24px, 4vw, 56px);
}

.article-head {
  padding-bottom: 26px;
  margin-bottom: 30px;
  border-bottom: 1px solid var(--line);
}

.article-head .kicker {
  margin-bottom: 14px;
}

.article-head h1 {
  margin: 0 0 18px;
  font-size: clamp(1.85rem, 4.4vw, 3rem);
  font-weight: 700;
  line-height: 1.2;
  letter-spacing: 0.005em;
  text-wrap: balance;
}

.article-meta {
  display: flex;
  flex-wrap: wrap;
  gap: 8px 18px;
  color: var(--steel);
  font-family: "Spline Sans Mono", Consolas, monospace;
  font-size: 0.76rem;
}

.article-meta .author {
  color: var(--cyan);
}

.article-cover {
  margin: 0 0 30px;
  border: 1px solid var(--line);
  background: var(--bg-soft);
}

.article-cover img {
  display: block;
  width: 100%;
  height: auto;
}

.article-cover figcaption {
  padding: 9px 14px;
  color: var(--steel);
  font-size: 0.76rem;
  border-top: 1px solid var(--line);
}

.toc {
  margin: 0 0 32px;
  padding: 20px 22px;
  background: var(--bg-soft);
  border: 1px solid var(--line);
}

.toc > strong {
  display: block;
  margin-bottom: 10px;
  color: var(--steel);
  font-family: "Spline Sans Mono", Consolas, monospace;
  font-size: 0.72rem;
  text-transform: uppercase;
  letter-spacing: 0.05em;
}

.toc ol {
  margin: 0;
  padding-left: 1.2em;
  columns: 2;
  column-gap: 32px;
}

.toc li {
  margin-bottom: 7px;
  break-inside: avoid;
}

.toc a {
  color: rgba(16, 24, 21, 0.8);
  font-size: 0.9rem;
}

.toc a:hover {
  color: var(--cyan);
}

.article-body {
  font-size: 1.03rem;
  line-height: 1.82;
  color: rgba(16, 24, 21, 0.9);
}

.article-body > h2 {
  margin: 46px 0 16px;
  padding-top: 28px;
  border-top: 1px solid var(--faint);
  font-size: clamp(1.4rem, 3vw, 2rem);
  font-weight: 700;
  line-height: 1.3;
  scroll-margin-top: 90px;
}

.article-body > h3 {
  margin: 30px 0 12px;
  font-size: clamp(1.15rem, 2vw, 1.4rem);
  font-weight: 700;
  line-height: 1.35;
  scroll-margin-top: 90px;
}

.article-body p {
  margin: 0 0 18px;
}

.article-body a {
  color: var(--cyan);
  text-decoration: underline;
  text-underline-offset: 2px;
  text-decoration-thickness: 1px;
}

.article-body a:hover {
  color: #005f6d;
}

.article-body ul,
.article-body ol {
  margin: 0 0 20px;
  padding-left: 1.4em;
}

.article-body li {
  margin-bottom: 9px;
}

.article-body strong {
  color: var(--ink);
}

.article-body blockquote {
  margin: 0 0 22px;
  padding: 4px 0 4px 20px;
  border-left: 3px solid var(--cyan);
  color: var(--muted);
}

.lead-answer {
  margin: 0 0 24px;
  padding: 18px 20px;
  background: rgba(158, 234, 61, 0.14);
  border: 1px solid rgba(0, 127, 145, 0.2);
  border-left: 3px solid var(--cyan);
  font-size: 1.02rem;
  line-height: 1.7;
}

.lead-answer strong {
  color: var(--ink);
}

/* 正文表格 */
.article-body .table-wrap {
  overflow-x: auto;
  margin: 0 0 24px;
  border: 1px solid var(--line);
}

.article-body table {
  width: 100%;
  border-collapse: collapse;
  font-size: 0.92rem;
  background: #fff;
}

.article-body th,
.article-body td {
  padding: 11px 14px;
  border: 1px solid var(--line);
  text-align: left;
  vertical-align: top;
  line-height: 1.55;
}

.article-body thead th {
  background: var(--bg-soft);
  font-family: "Spline Sans Mono", Consolas, monospace;
  font-size: 0.8rem;
  color: var(--ink);
}

.article-body caption {
  padding: 8px 0;
  color: var(--steel);
  font-size: 0.8rem;
  text-align: left;
}

/* FAQ */
.faq {
  margin: 40px 0 8px;
}

.faq h2 {
  margin: 0 0 16px;
  font-size: clamp(1.4rem, 3vw, 2rem);
}

.faq details {
  border: 1px solid var(--line);
  border-bottom: 0;
  background: rgba(251, 252, 247, 0.7);
}

.faq details:last-of-type {
  border-bottom: 1px solid var(--line);
}

.faq summary {
  padding: 15px 18px;
  font-weight: 700;
  cursor: pointer;
  list-style: none;
}

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

.faq summary::after {
  content: "+";
  float: right;
  color: var(--cyan);
  font-family: "Spline Sans Mono", Consolas, monospace;
}

.faq details[open] summary::after {
  content: "–";
}

.faq details p {
  margin: 0;
  padding: 0 18px 18px;
  color: rgba(16, 24, 21, 0.85);
  line-height: 1.75;
}

/* 正文内 / 工具内 复用注册卡 */
.reg-card {
  display: grid;
  grid-template-columns: minmax(0, 1fr) auto;
  align-items: center;
  gap: 22px;
  margin: 40px 0 10px;
  padding: 24px 26px;
  background: rgba(16, 24, 21, 0.96);
  border: 1px solid var(--ink);
  color: #eef3ea;
}

.reg-card .rc-copy p {
  margin: 0;
  color: rgba(238, 243, 234, 0.72);
  font-size: 0.92rem;
  line-height: 1.6;
}

.reg-card .rc-copy strong {
  color: #fff;
}

.reg-card .rc-code {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  margin: 4px 0 10px;
}

.reg-card .rc-code b {
  font-family: "Spline Sans Mono", Consolas, monospace;
  font-size: 1.3rem;
  letter-spacing: 0.06em;
  color: var(--green);
}

.reg-card .rc-code .copy-btn {
  min-width: 54px;
  min-height: 34px;
  border: 1px solid rgba(238, 243, 234, 0.28);
  background: transparent;
  color: #eef3ea;
}

.reg-card .rc-code .copy-btn:hover {
  background: var(--green);
  color: var(--ink);
}

.reg-card .rc-action {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-height: 50px;
  padding: 0 22px;
  background: var(--green);
  color: var(--ink);
  border: 1px solid var(--green);
  font-weight: 700;
  white-space: nowrap;
  transition: transform 160ms ease, background 160ms ease;
}

.reg-card .rc-action:hover,
.reg-card .rc-action:focus-visible {
  transform: translateY(-2px);
  background: #b0f24d;
  outline: none;
}

.reg-card .rc-foot {
  grid-column: 1 / -1;
  margin: 0;
  color: rgba(238, 243, 234, 0.5);
  font-size: 0.72rem;
  line-height: 1.5;
}

/* 作者署名 / 相关阅读 */
.article-foot {
  margin-top: 44px;
  padding-top: 26px;
  border-top: 1px solid var(--line);
}

.byline {
  display: grid;
  gap: 6px;
  margin-bottom: 28px;
}

.byline .b-name {
  font-weight: 700;
}

.byline p {
  margin: 0;
  color: var(--muted);
  font-size: 0.92rem;
  line-height: 1.7;
}

.related {
  display: grid;
  gap: 8px;
}

.related > strong {
  color: var(--steel);
  font-family: "Spline Sans Mono", Consolas, monospace;
  font-size: 0.72rem;
  text-transform: uppercase;
  letter-spacing: 0.05em;
}

.related a {
  color: var(--cyan);
  font-size: 0.95rem;
  padding: 3px 0;
}

.related a:hover {
  color: #005f6d;
}

.update-log {
  margin: 26px 0 0;
  color: var(--steel);
  font-size: 0.8rem;
  line-height: 1.6;
}

/* ============ 工具页 ============ */
.tool-panel {
  display: grid;
  gap: 18px;
  margin: 8px 0 26px;
  padding: clamp(20px, 3vw, 30px);
  background: rgba(252, 253, 249, 0.96);
  border: 1px solid var(--line);
  box-shadow: 0 20px 60px var(--shadow);
}

.tool-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(180px, 1fr));
  gap: 16px;
}

.tool-field {
  display: grid;
  gap: 7px;
}

.tool-field label {
  font-size: 0.88rem;
  font-weight: 700;
  color: rgba(16, 24, 21, 0.82);
}

.tool-field input,
.tool-field select {
  min-height: 46px;
  padding: 0 13px;
  border: 1px solid rgba(16, 24, 21, 0.24);
  background: #fff;
  color: var(--ink);
  font: inherit;
  font-size: 1rem;
}

.tool-field input:focus,
.tool-field select:focus {
  outline: 2px solid rgba(0, 127, 145, 0.4);
  outline-offset: 0;
  border-color: var(--cyan);
}

.tool-result {
  display: grid;
  gap: 6px;
  padding: 20px 22px;
  background: var(--ink);
  color: #eef3ea;
}

.tool-result .r-label {
  font-family: "Spline Sans Mono", Consolas, monospace;
  font-size: 0.74rem;
  color: rgba(238, 243, 234, 0.6);
  text-transform: uppercase;
}

.tool-result .r-value {
  font-size: clamp(1.6rem, 4vw, 2.3rem);
  font-weight: 700;
  color: var(--green);
  font-family: "Spline Sans Mono", Consolas, monospace;
}

.tool-result .r-sub {
  color: rgba(238, 243, 234, 0.72);
  font-size: 0.9rem;
  line-height: 1.6;
}

.tool-breakdown {
  display: grid;
  gap: 1px;
  background: var(--line);
  border: 1px solid var(--line);
}

.tool-breakdown div {
  display: flex;
  justify-content: space-between;
  gap: 16px;
  padding: 10px 14px;
  background: #fff;
  font-size: 0.9rem;
}

.tool-breakdown span:last-child {
  font-family: "Spline Sans Mono", Consolas, monospace;
  font-weight: 700;
}

.tool-note {
  color: var(--steel);
  font-size: 0.82rem;
  line-height: 1.6;
}

/* ============ 列表页（guides / tools 索引） ============ */
.list-hero {
  margin-bottom: 12px;
}

.list-hero h1 {
  margin: 8px 0 14px;
  font-size: clamp(2rem, 5vw, 3.2rem);
  line-height: 1.12;
}

.list-hero p {
  max-width: 640px;
  color: var(--muted);
  line-height: 1.7;
}

.list-group {
  margin-top: 40px;
}

.list-group > h2 {
  margin: 0 0 4px;
  font-size: 1.3rem;
}

.list-group > .lg-sub {
  margin: 0 0 18px;
  color: var(--muted);
  font-size: 0.92rem;
}

.card-list {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(280px, 1fr));
  gap: 1px;
  background: rgba(16, 24, 21, 0.1);
  border: 1px solid var(--line);
}

.card-list a {
  display: grid;
  gap: 8px;
  padding: 22px 22px 24px;
  background: rgba(252, 253, 249, 0.92);
  transition: background 160ms ease;
}

.card-list a:hover {
  background: #fff;
}

.card-list .cl-cat {
  font-family: "Spline Sans Mono", Consolas, monospace;
  font-size: 0.7rem;
  color: var(--cyan);
  text-transform: uppercase;
}

.card-list .cl-title {
  font-size: 1.05rem;
  font-weight: 700;
  line-height: 1.4;
  color: var(--ink);
}

.card-list .cl-desc {
  color: var(--muted);
  font-size: 0.88rem;
  line-height: 1.55;
}

@media (max-width: 640px) {
  .reading {
    width: min(100% - 32px, 940px);
    padding: 92px 0 40px;
  }

  .toc ol {
    columns: 1;
  }

  .reg-card {
    grid-template-columns: 1fr;
    gap: 16px;
  }

  .reg-card .rc-action {
    width: 100%;
  }
}

/* ============ 移动端触摸命中区 ≥44px ============ */
@media (max-width: 880px) {
  .index-col a,
  .related a,
  .dd-group a {
    min-height: 44px;
    display: flex;
    align-items: center;
  }

  .breadcrumb {
    font-size: 0.8rem;
  }

  .breadcrumb a {
    min-height: 44px;
    display: inline-flex;
    align-items: center;
  }

  .reg-card .rc-code .copy-btn {
    min-height: 44px;
  }

  .capability-card h3 a,
  .process-list strong a {
    display: inline-flex;
    align-items: center;
    min-height: 44px;
  }
}