/* =========================================================================
   跃港互联官网 V1 · 全局样式
   -------------------------------------------------------------------------
   设计约束（交接文档第二十一至二十四条）：
   - 不用渐变背景、不用大圆角、不用阴影堆叠、不用玻璃拟态
   - 优先使用：留白、细线、对比、网格、数字排版
   - 视觉语言对标商业咨询报告，不对标 SaaS 落地页
   - 动画克制，尊重 prefers-reduced-motion
   ========================================================================= */

/* ---------------------------------------------------------------- Tokens */

:root {
  /* 品牌色 */
  --c-navy: #102a43;
  --c-deep: #0b1f33;
  --c-teal: #0f8b8d;
  --c-teal-bright: #5fcfd1;
  --c-teal-dark: #0b6f71;

  /* 背景与文字 */
  --c-tint: #f5f7f8;
  --c-white: #ffffff;
  --c-text: #172b3a;
  --c-muted: #637381;
  --c-border: #dce4e8;
  --c-border-strong: #c3d0d7;

  /* 深色区域 */
  --c-on-dark: #e8f1f5;
  --c-on-dark-muted: #8fb3c7;
  --c-border-dark: #24445c;

  /* 强调（仅少量使用） */
  --c-warn: #d9a441;
  --c-warn-soft: #fdf6e7;
  --c-error: #b4341f;
  --c-error-soft: #fdf1ef;

  /* 字体 */
  --font-sans: -apple-system, BlinkMacSystemFont, "Segoe UI", "PingFang SC", "Hiragino Sans GB",
    "Microsoft YaHei", "Helvetica Neue", Arial, sans-serif;
  --font-mono: ui-monospace, SFMono-Regular, "SF Mono", Menlo, Consolas, "Liberation Mono", monospace;

  /* 版式 */
  --shell: 1240px;
  --shell-narrow: 760px;
  --header-h: 68px;
  --section-y: 112px;

  /* 圆角：卡片 12—18px，其余保持小圆角 */
  --r-xs: 3px;
  --r-sm: 6px;
  --r-md: 10px;
  --r-lg: 14px;

  /* 唯一允许的阴影：极轻 */
  --shadow-soft: 0 1px 2px rgba(11, 31, 51, 0.04);
}

/* ------------------------------------------------------------------ Base */

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

html {
  -webkit-text-size-adjust: 100%;
  scroll-behavior: smooth;
}

body {
  margin: 0;
  background: var(--c-white);
  color: var(--c-text);
  font-family: var(--font-sans);
  font-size: 16px;
  line-height: 1.75;
  font-feature-settings: "kern" 1;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
  overflow-x: hidden;
}

h1,
h2,
h3,
h4 {
  margin: 0;
  font-weight: 600;
  line-height: 1.25;
  letter-spacing: -0.01em;
}

p {
  margin: 0;
}

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

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

a {
  color: var(--c-teal-dark);
  text-decoration: none;
}

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

button {
  font: inherit;
  color: inherit;
}

code {
  font-family: var(--font-mono);
  font-size: 0.88em;
  background: var(--c-tint);
  border: 1px solid var(--c-border);
  border-radius: var(--r-xs);
  padding: 1px 5px;
}

:focus-visible {
  outline: 2px solid var(--c-teal);
  outline-offset: 2px;
  border-radius: var(--r-xs);
}

/* 数字统一使用等宽数字，避免排版跳动 */
.tabular,
.data-card__value,
.progress__label strong,
.stat-number {
  font-variant-numeric: tabular-nums;
}

/* --------------------------------------------------------------- Layout */

.shell {
  width: 100%;
  max-width: var(--shell);
  margin: 0 auto;
  padding: 0 32px;
}

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

.section--white {
  background: var(--c-white);
}

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

.section--deep {
  background: var(--c-navy);
  color: var(--c-on-dark);
  --link-color: var(--c-teal-bright);
}

/* 深色区顶部细线，与上一屏形成清晰分界 */
.section--deep {
  border-top: 1px solid var(--c-border-dark);
}

.section-note {
  margin-top: 32px;
  font-size: 13px;
  color: var(--c-muted);
  line-height: 1.7;
}

.section-note--left {
  text-align: left;
  max-width: var(--shell-narrow);
  padding-top: 24px;
  border-top: 1px solid var(--c-border);
}

.sr-only {
  position: absolute;
  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: -60px;
  z-index: 200;
  background: var(--c-deep);
  color: #fff;
  padding: 10px 16px;
  border-radius: var(--r-sm);
  transition: top 0.2s;
}

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

/* ---------------------------------------------------------------- Header */

.site-header {
  position: fixed;
  inset: 0 0 auto 0;
  z-index: 100;
  height: var(--header-h);
  border-bottom: 1px solid transparent;
  transition: background-color 0.28s ease, border-color 0.28s ease, color 0.28s ease;
}

.site-header__inner {
  height: var(--header-h);
  display: flex;
  align-items: center;
  gap: 40px;
}

/* 非首页：始终白底 */
.site-header--solid {
  background: var(--c-white);
  color: var(--c-text);
  border-bottom-color: var(--c-border);
}

/* 首页：Hero 深色，Header 初始透明 */
.site-header--overlay {
  color: var(--c-on-dark);
}

.site-header--overlay.is-scrolled {
  background: rgba(255, 255, 255, 0.94);
  -webkit-backdrop-filter: saturate(180%) blur(14px);
  backdrop-filter: saturate(180%) blur(14px);
  color: var(--c-text);
  border-bottom-color: var(--c-border);
}

.brand {
  display: inline-flex;
  align-items: center;
  gap: 11px;
  color: inherit;
  flex: 0 0 auto;
}

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

.brand__mark {
  display: block;
  color: inherit;
}

.brand__text {
  display: flex;
  flex-direction: column;
  line-height: 1.15;
}

.brand__zh {
  font-size: 16px;
  font-weight: 600;
  letter-spacing: 0.04em;
}

.brand__en {
  font-size: 9.5px;
  letter-spacing: 0.18em;
  text-transform: uppercase;
  opacity: 0.6;
}

.site-nav {
  flex: 1 1 auto;
  display: flex;
  justify-content: flex-end;
}

.site-nav__links {
  display: flex;
  align-items: center;
  gap: 34px;
}

.nav-link {
  position: relative;
  color: inherit;
  font-size: 14.5px;
  letter-spacing: 0.01em;
  padding: 6px 0;
  opacity: 0.86;
}

.nav-link:hover {
  opacity: 1;
  text-decoration: none;
}

.nav-link.is-active {
  opacity: 1;
}

.nav-link.is-active::after {
  content: "";
  position: absolute;
  left: 0;
  right: 0;
  bottom: 0;
  height: 1.5px;
  background: var(--c-teal);
}

.site-header__actions {
  display: flex;
  align-items: center;
  gap: 12px;
  flex: 0 0 auto;
}

.nav-toggle {
  display: none;
  width: 40px;
  height: 40px;
  border: 1px solid currentColor;
  border-radius: var(--r-sm);
  background: transparent;
  opacity: 0.7;
  cursor: pointer;
  padding: 0;
  position: relative;
}

.nav-toggle__bar {
  position: absolute;
  left: 11px;
  right: 11px;
  height: 1.5px;
  background: currentColor;
  transition: transform 0.24s ease, opacity 0.24s ease;
}

.nav-toggle__bar:first-child {
  top: 16px;
}

.nav-toggle__bar:last-child {
  top: 22px;
}

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

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

.mobile-nav {
  background: var(--c-white);
  border-bottom: 1px solid var(--c-border);
  box-shadow: var(--shadow-soft);
}

.mobile-nav__inner {
  display: flex;
  flex-direction: column;
  gap: 4px;
  padding-top: 8px;
  padding-bottom: 20px;
}

.mobile-nav-link {
  color: var(--c-text);
  font-size: 16px;
  padding: 13px 0;
  border-bottom: 1px solid var(--c-border);
}

.mobile-nav-link:hover {
  text-decoration: none;
  color: var(--c-teal-dark);
}

.mobile-nav .btn {
  margin-top: 16px;
}

/* --------------------------------------------------------------- Buttons */

.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  border: 1px solid transparent;
  border-radius: var(--r-sm);
  font-size: 14.5px;
  font-weight: 500;
  line-height: 1;
  cursor: pointer;
  transition: background-color 0.18s ease, border-color 0.18s ease, color 0.18s ease;
  text-align: center;
  white-space: nowrap;
}

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

.btn--sm {
  padding: 10px 16px;
  font-size: 13.5px;
}

.btn--md {
  padding: 13px 22px;
}

.btn--lg {
  padding: 16px 28px;
  font-size: 15.5px;
}

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

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

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

.btn--outline {
  background: transparent;
  color: var(--c-text);
  border-color: var(--c-border-strong);
}

.btn--outline:hover {
  border-color: var(--c-navy);
  color: var(--c-navy);
}

.btn--ghost {
  background: transparent;
  color: var(--link-color, var(--c-teal-dark));
  border-color: transparent;
  padding-left: 0;
  padding-right: 0;
  font-weight: 500;
}

.btn--ghost:hover {
  color: var(--c-navy);
}

.section--deep .btn--ghost:hover,
.hero .btn--ghost:hover {
  color: #fff;
}

.btn__arrow {
  transition: transform 0.2s ease;
}

.btn--ghost:hover .btn__arrow,
.btn--arrow:hover .btn__arrow {
  transform: translateX(3px);
}

.btn[disabled] {
  opacity: 0.55;
  cursor: not-allowed;
}

/* ---------------------------------------------------------- Section head */

.section-head {
  display: grid;
  grid-template-columns: 200px 1fr;
  gap: 40px;
  align-items: start;
  margin-bottom: 64px;
}

.section-head__meta {
  display: flex;
  flex-direction: column;
  gap: 8px;
  padding-top: 6px;
}

.section-head__index {
  font-family: var(--font-mono);
  font-size: 13px;
  font-weight: 500;
  color: var(--c-teal);
  letter-spacing: 0.08em;
}

.section-head__eyebrow {
  font-size: 12px;
  letter-spacing: 0.14em;
  color: var(--c-muted);
  text-transform: none;
}

.section-head__title {
  font-size: clamp(25px, 2.5vw, 36px);
  line-height: 1.28;
  letter-spacing: -0.015em;
  max-width: 22em;
}

.section-head__title--sm {
  font-size: clamp(20px, 1.9vw, 26px);
  margin-bottom: 40px;
}

.section-head__sub {
  margin-top: 18px;
  font-size: 16.5px;
  color: var(--c-muted);
  max-width: 46em;
  line-height: 1.8;
}

.section-head--dark .section-head__title {
  color: var(--c-on-dark);
}

.section-head--dark .section-head__sub,
.section-head--dark .section-head__eyebrow {
  color: var(--c-on-dark-muted);
}

/* 区块结论句：全站统一的「观点」排版 */
.section-conclusion {
  margin-top: 64px;
  padding-top: 32px;
  border-top: 1px solid var(--c-border);
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  justify-content: space-between;
  gap: 24px;
}

.section-conclusion p {
  font-size: clamp(18px, 1.7vw, 23px);
  font-weight: 500;
  line-height: 1.6;
  max-width: 40em;
  letter-spacing: -0.01em;
}

.section-conclusion--strong {
  border-top-color: var(--c-navy);
  border-top-width: 2px;
}

/* ------------------------------------------------------------------ Hero */

.hero {
  position: relative;
  background: var(--c-deep);
  color: var(--c-on-dark);
  padding-top: calc(var(--header-h) + 72px);
  padding-bottom: 88px;
  overflow: hidden;
}

.hero__inner {
  display: grid;
  grid-template-columns: minmax(0, 1.02fr) minmax(0, 0.98fr);
  gap: 56px;
  align-items: center;
}

.hero__content {
  max-width: 34em;
}

.hero__eyebrow {
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.18em;
  color: var(--c-teal-bright);
  margin-bottom: 26px;
}

.hero__title {
  font-size: clamp(34px, 4.4vw, 58px);
  line-height: 1.16;
  letter-spacing: -0.025em;
  font-weight: 600;
  color: #fff;
}

.hero__subtitle {
  margin-top: 28px;
  font-size: clamp(15.5px, 1.15vw, 17.5px);
  line-height: 1.85;
  color: var(--c-on-dark);
  opacity: 0.82;
  max-width: 32em;
}

.hero__support {
  margin-top: 20px;
  font-size: 15px;
  color: var(--c-teal-bright);
  letter-spacing: 0.01em;
}

.hero__actions {
  margin-top: 40px;
  display: flex;
  align-items: center;
  flex-wrap: wrap;
  gap: 12px 28px;
}

.hero__reassurances {
  margin-top: 36px;
  padding-top: 26px;
  border-top: 1px solid var(--c-border-dark);
  display: flex;
  flex-wrap: wrap;
  gap: 10px 26px;
}

.hero__reassurances li {
  position: relative;
  padding-left: 20px;
  font-size: 13.5px;
  color: var(--c-on-dark-muted);
  line-height: 1.7;
}

.hero__reassurances li::before {
  content: "";
  position: absolute;
  left: 0;
  top: 0.62em;
  width: 9px;
  height: 1px;
  background: var(--c-teal);
}

.hero__visual-wrap {
  display: flex;
  justify-content: center;
  align-items: center;
}

.hero-visual {
  width: 100%;
  max-width: 620px;
}

.hero-visual__svg {
  width: 100%;
  height: auto;
  overflow: visible;
}

/* Hero 视觉动效：克制、慢速。
   每条流动线由两层组成 —— 底层低透明度实线给出连续路径感，
   上层虚线缓慢流动表达「客流在移动」。 */
.hv-flow-base {
  stroke-opacity: 0.34;
}

.hv-flow {
  stroke-dasharray: 16 30;
  animation: hv-dash 6s linear infinite;
}

.hv-flow--out {
  animation-duration: 7s;
}

@keyframes hv-dash {
  to {
    stroke-dashoffset: -184;
  }
}

.hv-core__ring {
  transform-origin: 310px 240px;
  animation: hv-pulse 7s ease-in-out infinite;
}

.hv-core__ring--2 {
  animation-delay: 1.2s;
}

@keyframes hv-pulse {
  0%,
  100% {
    opacity: 0.35;
    transform: scale(1);
  }
  50% {
    opacity: 0.85;
    transform: scale(1.05);
  }
}

.hv-node__halo {
  transform-origin: center;
  animation: hv-halo 6s ease-in-out infinite;
}

@keyframes hv-halo {
  0%,
  100% {
    opacity: 0.5;
  }
  50% {
    opacity: 1;
  }
}

/* -------------------------------------------------------------- Data cards */

.stats-grid {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 0;
  border-top: 1px solid var(--c-border);
}

.data-card {
  padding: 36px 32px 40px;
  border-right: 1px solid var(--c-border);
  border-bottom: 1px solid var(--c-border);
  display: flex;
  flex-direction: column;
}

.data-card:first-child {
  padding-left: 0;
}

.data-card:last-child {
  border-right: 0;
  padding-right: 0;
}

.data-card__rule {
  width: 36px;
  height: 2px;
  background: var(--c-teal);
  margin-bottom: 24px;
}

.data-card__scope {
  font-size: 12.5px;
  color: var(--c-muted);
  letter-spacing: 0.02em;
  margin-bottom: 20px;
  line-height: 1.6;
}

.data-card__value {
  font-size: clamp(36px, 3.6vw, 52px);
  font-weight: 600;
  line-height: 1.05;
  letter-spacing: -0.03em;
  color: var(--c-navy);
  margin-bottom: 14px;
}

.data-card__label {
  font-size: 15px;
  font-weight: 500;
  line-height: 1.6;
  margin-bottom: 6px;
}

.data-card__delta-row {
  margin-bottom: 22px;
}

.data-card__delta {
  font-family: var(--font-mono);
  font-size: 12.5px;
  color: var(--c-teal-dark);
  letter-spacing: 0.02em;
}

.data-card__delta--empty {
  color: var(--c-border-strong);
}

.data-card__desc {
  font-size: 14px;
  line-height: 1.8;
  color: var(--c-text);
  opacity: 0.88;
  margin-bottom: 18px;
}

/* 口径注：与数据同等重要，不允许折叠 */
.data-card__footnote {
  font-size: 12.5px;
  line-height: 1.75;
  color: var(--c-muted);
  padding-top: 16px;
  border-top: 1px dashed var(--c-border);
  margin-top: auto;
}

.data-card__source {
  margin-top: 10px;
  font-size: 11.5px;
  color: var(--c-muted);
  opacity: 0.85;
  line-height: 1.7;
}

/* ---------------------------------------------------------------- Funnel */

.funnel {
  border-top: 1px solid var(--c-border);
  border-bottom: 1px solid var(--c-border);
  padding: 8px 0;
}

.funnel__list {
  display: grid;
  grid-template-columns: repeat(7, minmax(0, 1fr));
  align-items: stretch;
}

.funnel__item {
  position: relative;
  padding: 30px 12px 30px 0;
  display: flex;
  flex-direction: column;
  gap: 10px;
}

.funnel__item:not(:last-child)::after {
  content: "";
  position: absolute;
  right: 14px;
  top: 40px;
  width: 12px;
  height: 1px;
  background: var(--c-border-strong);
}

.funnel__no {
  font-family: var(--font-mono);
  font-size: 11px;
  color: var(--c-muted);
  letter-spacing: 0.1em;
}

.funnel__label {
  font-size: 16px;
  font-weight: 500;
  letter-spacing: 0.02em;
}

.funnel__hint {
  display: none;
}

/* ----------------------------------------------------------- Issue cards */

.issues-grid {
  margin-top: 64px;
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 1px;
  background: var(--c-border);
  border: 1px solid var(--c-border);
}

.issue-card {
  background: var(--c-tint);
  padding: 36px 34px 38px;
  display: flex;
  flex-direction: column;
  gap: 14px;
}

.issue-card__no {
  font-family: var(--font-mono);
  font-size: 11.5px;
  color: var(--c-teal);
  letter-spacing: 0.12em;
}

.issue-card__title {
  font-size: 19px;
  letter-spacing: -0.01em;
}

.issue-card__text {
  font-size: 14.5px;
  line-height: 1.85;
  color: var(--c-muted);
}

/* -------------------------------------------------------------- Approach */

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

.approach__item {
  padding: 34px 30px 40px;
  border-right: 1px solid var(--c-border);
  border-bottom: 1px solid var(--c-border);
  position: relative;
}

.approach__item:first-child {
  padding-left: 0;
}

.approach__item:last-child {
  border-right: 0;
  padding-right: 0;
}

.approach__head {
  display: flex;
  align-items: baseline;
  gap: 12px;
  margin-bottom: 22px;
}

.approach__no {
  font-family: var(--font-mono);
  font-size: 13px;
  color: var(--c-teal);
  letter-spacing: 0.06em;
}

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

.approach__title {
  font-size: 21px;
  margin-bottom: 16px;
  letter-spacing: -0.015em;
}

.approach__text {
  font-size: 14.5px;
  line-height: 1.85;
  color: var(--c-muted);
}

/* ------------------------------------------------------------ Industries */

.industries-grid {
  display: grid;
  grid-template-columns: repeat(4, minmax(0, 1fr));
  gap: 20px;
}

.industry-card {
  background: var(--c-white);
  border: 1px solid var(--c-border);
  border-radius: var(--r-lg);
  padding: 30px 26px 28px;
  display: flex;
  flex-direction: column;
  gap: 18px;
  transition: border-color 0.2s ease, transform 0.2s ease;
}

.industry-card:hover,
.industry-card:focus-visible {
  border-color: var(--c-teal);
  transform: translateY(-2px);
}

.industry-card__head {
  display: flex;
  align-items: baseline;
  gap: 12px;
  padding-bottom: 16px;
  border-bottom: 1px solid var(--c-border);
}

.industry-card__no {
  font-family: var(--font-mono);
  font-size: 11.5px;
  color: var(--c-teal);
  letter-spacing: 0.1em;
}

.industry-card__name {
  font-size: 17px;
  letter-spacing: -0.005em;
}

.industry-card__text {
  font-size: 14px;
  line-height: 1.85;
  color: var(--c-muted);
  flex: 1 1 auto;
}

.industry-card__focus {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  padding-top: 16px;
  border-top: 1px solid var(--c-border);
}

.industry-card__focus li {
  font-size: 11.5px;
  color: var(--c-navy);
  background: var(--c-tint);
  border: 1px solid var(--c-border);
  border-radius: 100px;
  padding: 4px 11px;
  line-height: 1.5;
}

/* ------------------------------------------------------- Trust / Report */

.trust-section {
  background: var(--c-navy);
}

.trust-grid {
  display: grid;
  grid-template-columns: minmax(0, 0.82fr) minmax(0, 1.18fr);
  gap: 64px;
  align-items: start;
}

.trust-subhead {
  font-size: 13px;
  letter-spacing: 0.1em;
  color: var(--c-on-dark-muted);
  margin-bottom: 28px;
  font-weight: 500;
}

.timeline {
  position: relative;
  padding-left: 34px;
}

.timeline::before {
  content: "";
  position: absolute;
  left: 9px;
  top: 12px;
  bottom: 12px;
  width: 1px;
  background: var(--c-border-dark);
}

.timeline__item {
  position: relative;
  display: flex;
  align-items: baseline;
  gap: 14px;
  padding: 11px 0;
}

.timeline__marker {
  position: absolute;
  left: -34px;
  top: 12px;
  width: 19px;
  height: 19px;
  display: flex;
  align-items: center;
  justify-content: center;
  font-family: var(--font-mono);
  font-size: 9.5px;
  color: var(--c-teal-bright);
  background: var(--c-navy);
  border: 1px solid var(--c-border-dark);
  border-radius: 50%;
  line-height: 1;
}

.timeline__label {
  font-size: 15.5px;
  color: var(--c-on-dark);
  line-height: 1.7;
}

.trust-emphasis {
  margin-top: 32px;
  padding: 20px 22px;
  background: rgba(15, 139, 141, 0.12);
  border-left: 2px solid var(--c-teal);
  border-radius: 0 var(--r-sm) var(--r-sm) 0;
  font-size: 14.5px;
  line-height: 1.8;
  color: #fff;
}

.trust-grid__deliverable {
  display: grid;
  grid-template-columns: 180px minmax(0, 1fr);
  gap: 36px;
  align-items: center;
}

.report-cover__svg {
  width: 100%;
  height: auto;
}

.report-cover__caption {
  margin-top: 18px;
  font-size: 12.5px;
  color: var(--c-on-dark-muted);
  text-align: center;
  letter-spacing: 0.02em;
}

.deliverable-list li {
  position: relative;
  padding: 14px 0 14px 24px;
  border-bottom: 1px solid var(--c-border-dark);
  font-size: 15.5px;
  color: var(--c-on-dark);
  line-height: 1.7;
}

.deliverable-list li:first-child {
  border-top: 1px solid var(--c-border-dark);
}

.deliverable-list li::before {
  content: "";
  position: absolute;
  left: 0;
  top: 1.35em;
  width: 10px;
  height: 1px;
  background: var(--c-teal-bright);
}

.trust-cta {
  margin-top: 72px;
  padding-top: 40px;
  border-top: 1px solid var(--c-border-dark);
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 20px 28px;
}

.trust-cta__footnote {
  font-size: 13.5px;
  color: var(--c-on-dark-muted);
}

/* -------------------------------------------------------------- Page hero */

.page-hero {
  background: var(--c-navy);
  color: var(--c-on-dark);
  padding-top: calc(var(--header-h) + 76px);
  padding-bottom: 76px;
  border-bottom: 1px solid var(--c-border-dark);
}

.page-hero__inner {
  max-width: 860px;
}

.page-hero__eyebrow {
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.18em;
  color: var(--c-teal-bright);
  margin-bottom: 22px;
}

.page-hero__title {
  font-size: clamp(30px, 3.4vw, 46px);
  line-height: 1.2;
  letter-spacing: -0.025em;
  color: #fff;
}

.page-hero__subtitle {
  margin-top: 24px;
  font-size: clamp(15.5px, 1.15vw, 17px);
  line-height: 1.85;
  color: var(--c-on-dark);
  opacity: 0.82;
  max-width: 44em;
}

.page-hero__emphasis {
  margin-top: 26px;
  display: inline-flex;
  align-items: center;
  gap: 10px;
  font-size: 14.5px;
  color: #fff;
  padding: 10px 16px;
  border: 1px solid var(--c-border-dark);
  border-radius: var(--r-sm);
  background: rgba(15, 139, 141, 0.1);
}

.check-icon {
  color: var(--c-teal-bright);
  font-size: 13px;
}

.privacy-updated {
  margin-top: 22px;
  font-size: 13px;
  color: var(--c-on-dark-muted);
  font-family: var(--font-mono);
}

/* ------------------------------------------------------------------ Form */

.form-section {
  padding-top: 72px;
}

.form-shell {
  max-width: 840px;
}

.progress {
  margin-bottom: 48px;
}

.progress__track {
  height: 2px;
  background: var(--c-border);
  overflow: hidden;
}

.progress__fill {
  display: block;
  height: 100%;
  background: var(--c-teal);
  transition: width 0.35s ease;
}

.progress__label {
  margin-top: 14px;
  font-size: 13px;
  color: var(--c-muted);
  display: flex;
  gap: 8px;
  align-items: baseline;
}

.progress__label strong {
  color: var(--c-navy);
  font-weight: 600;
}

.progress__sep {
  color: var(--c-border-strong);
}

.form-step__title {
  font-size: 22px;
  margin-bottom: 36px;
  display: flex;
  align-items: baseline;
  gap: 14px;
  flex-wrap: wrap;
}

.form-step__no {
  font-family: var(--font-mono);
  font-size: 12px;
  color: var(--c-teal);
  letter-spacing: 0.08em;
  font-weight: 500;
}

.fields {
  display: flex;
  flex-direction: column;
  gap: 42px;
}

.field {
  border: 0;
  padding: 0;
  margin: 0;
  min-width: 0;
}

.field__legend,
.field__label {
  display: block;
  font-size: 16.5px;
  font-weight: 500;
  line-height: 1.6;
  padding: 0;
  margin-bottom: 8px;
  letter-spacing: -0.005em;
}

.field__req,
.field__opt {
  font-size: 11px;
  font-weight: 400;
  letter-spacing: 0.06em;
  color: var(--c-muted);
  border: 1px solid var(--c-border);
  border-radius: 100px;
  padding: 2px 8px;
  margin-left: 10px;
  vertical-align: 2px;
}

.field__hint {
  font-size: 13.5px;
  color: var(--c-muted);
  line-height: 1.75;
  margin-bottom: 18px;
}

.field__error {
  margin-top: 12px;
  font-size: 13.5px;
  color: var(--c-error);
  line-height: 1.7;
  padding-left: 20px;
  position: relative;
}

.field__error::before {
  content: "!";
  position: absolute;
  left: 0;
  top: 0.15em;
  width: 14px;
  height: 14px;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 10px;
  font-weight: 700;
  color: #fff;
  background: var(--c-error);
  border-radius: 50%;
  line-height: 1;
}

/* 错误态不能只依赖颜色：加边框加粗 + 错误文案 + 图标 */
.field.has-error .field__input,
.field.has-error .choices {
  border-color: var(--c-error);
}

.field.has-error .field__legend,
.field.has-error .field__label {
  color: var(--c-error);
}

/* 选项：移动端大按钮化，单手可点 */
.choices {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(210px, 1fr));
  gap: 10px;
  border: 1px solid transparent;
  border-radius: var(--r-sm);
}

.choice__label {
  display: flex;
  align-items: center;
  min-height: 52px;
  padding: 14px 18px;
  border: 1px solid var(--c-border-strong);
  border-radius: var(--r-sm);
  background: var(--c-white);
  font-size: 15px;
  line-height: 1.5;
  cursor: pointer;
  transition: border-color 0.16s ease, background-color 0.16s ease, color 0.16s ease;
  position: relative;
  padding-left: 44px;
}

/* 自定义单选标记，避免原生控件尺寸不一 */
.choice__label::before {
  content: "";
  position: absolute;
  left: 18px;
  top: 50%;
  transform: translateY(-50%);
  width: 14px;
  height: 14px;
  border: 1px solid var(--c-border-strong);
  border-radius: 50%;
  background: var(--c-white);
  transition: border-color 0.16s ease, box-shadow 0.16s ease;
}

.choice__label:hover {
  border-color: var(--c-navy);
}

.choice__input:checked + .choice__label {
  border-color: var(--c-teal);
  background: rgba(15, 139, 141, 0.06);
  color: var(--c-navy);
  font-weight: 500;
}

.choice__input:checked + .choice__label::before {
  border-color: var(--c-teal);
  border-width: 4.5px;
}

.choice__input:focus-visible + .choice__label {
  outline: 2px solid var(--c-teal);
  outline-offset: 2px;
}

/* 文本输入 */
.field__input {
  width: 100%;
  min-height: 50px;
  padding: 13px 16px;
  font: inherit;
  font-size: 15.5px;
  color: var(--c-text);
  background: var(--c-white);
  border: 1px solid var(--c-border-strong);
  border-radius: var(--r-sm);
  transition: border-color 0.16s ease;
}

.field__input::placeholder {
  color: var(--c-muted);
  opacity: 0.7;
}

.field__input:hover {
  border-color: var(--c-navy);
}

.field__input:focus {
  outline: none;
  border-color: var(--c-teal);
  box-shadow: 0 0 0 3px rgba(15, 139, 141, 0.14);
}

/* 隐私同意 */
.consent {
  display: flex;
  gap: 14px;
  align-items: flex-start;
  padding: 20px;
  background: var(--c-tint);
  border: 1px solid var(--c-border);
  border-radius: var(--r-sm);
}

.consent__input {
  width: 19px;
  height: 19px;
  margin: 3px 0 0;
  flex: 0 0 auto;
  accent-color: var(--c-teal);
  cursor: pointer;
}

.consent__label {
  font-size: 14px;
  line-height: 1.8;
  color: var(--c-text);
  cursor: pointer;
}

.consent__link {
  margin-left: 4px;
  white-space: nowrap;
}

/* Honeypot：视觉隐藏但保留在 DOM 中 */
.hp-field {
  position: absolute;
  left: -9999px;
  width: 1px;
  height: 1px;
  overflow: hidden;
}

.form-nav {
  margin-top: 52px;
  padding-top: 32px;
  border-top: 1px solid var(--c-border);
  display: flex;
  align-items: center;
  gap: 14px;
}

.form-nav__spacer {
  flex: 1 1 auto;
}

/* 由 JS 控制显示：默认隐藏「上一步」与「提交」 */
.form-nav #stepPrev,
.form-nav #submitBtn {
  display: none;
}

.form-nav[data-step="2"] #stepPrev,
.form-nav[data-step="2"] #submitBtn {
  display: inline-flex;
}

.form-nav[data-step="2"] #stepNext {
  display: none;
}

/* 无 JS 降级：两个步骤都显示，隐藏步骤导航，直接提交 */
.no-js .form-nav #stepPrev,
.no-js .form-nav #stepNext {
  display: none;
}

.no-js .form-nav #submitBtn {
  display: inline-flex;
}

.no-js .form-step[hidden] {
  display: block;
}

.form-footnote {
  margin-top: 18px;
  font-size: 13px;
  color: var(--c-muted);
}

.form-status {
  margin-top: 20px;
  font-size: 14px;
}

.form-status.is-error {
  color: var(--c-error);
}

/* -------------------------------------------------------- Success state */

.success-card {
  border: 1px solid var(--c-border);
  border-radius: var(--r-lg);
  padding: 56px 52px;
  background: var(--c-white);
  max-width: 760px;
}

.success-card__eyebrow {
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.16em;
  color: var(--c-teal);
  margin-bottom: 20px;
}

.success-card__title {
  font-size: clamp(24px, 2.4vw, 32px);
  letter-spacing: -0.02em;
  margin-bottom: 22px;
}

.success-card__body {
  font-size: 15.5px;
  line-height: 1.9;
  color: var(--c-muted);
  margin-bottom: 26px;
}

.success-card__emphasis {
  font-size: 17px;
  font-weight: 500;
  line-height: 1.75;
  color: var(--c-navy);
  padding: 22px 24px;
  background: var(--c-tint);
  border-left: 3px solid var(--c-teal);
  border-radius: 0 var(--r-sm) var(--r-sm) 0;
  margin-bottom: 26px;
}

.success-card__email {
  font-size: 14.5px;
  color: var(--c-muted);
  margin-bottom: 10px;
}

.success-card__email strong {
  color: var(--c-navy);
  font-weight: 600;
}

.success-card__tip {
  font-size: 13.5px;
  color: var(--c-muted);
  margin-bottom: 36px;
}

.success-card__actions {
  display: flex;
  flex-wrap: wrap;
  gap: 12px 28px;
  padding-top: 28px;
  border-top: 1px solid var(--c-border);
}

/* Mock 模式提示：不把假提交伪装成真实成功 */
.mock-notice {
  margin-bottom: 32px;
  padding: 16px 20px;
  background: var(--c-warn-soft);
  border: 1px solid var(--c-warn);
  border-left-width: 3px;
  border-radius: 0 var(--r-sm) var(--r-sm) 0;
  font-size: 13.5px;
  line-height: 1.8;
  color: #6b4e12;
}

.mock-notice strong {
  color: #4d3809;
}

/* ------------------------------------------------------------- Form aside */

.form-aside {
  border-top: 1px solid var(--c-border);
  padding-top: 36px;
}

.form-aside__title {
  font-size: 17px;
  margin-bottom: 26px;
}

.form-aside__list {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(240px, 1fr));
  gap: 26px 40px;
}

.form-aside__list dt {
  font-size: 12px;
  letter-spacing: 0.1em;
  color: var(--c-teal-dark);
  margin-bottom: 8px;
  font-family: var(--font-mono);
}

.form-aside__list dd {
  font-size: 14.5px;
  line-height: 1.85;
  color: var(--c-muted);
}

.form-aside__note {
  margin-top: 32px;
  font-size: 13px;
  color: var(--c-muted);
}

/* -------------------------------------------------------------- Insights */

.filter-bar {
  display: flex;
  align-items: center;
  gap: 24px;
  flex-wrap: wrap;
  padding-bottom: 28px;
  border-bottom: 1px solid var(--c-border);
  margin-bottom: 48px;
}

.filter-bar__label {
  font-size: 12px;
  letter-spacing: 0.12em;
  color: var(--c-muted);
  font-family: var(--font-mono);
}

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

.filter-chip {
  padding: 8px 16px;
  font-size: 13.5px;
  border: 1px solid var(--c-border-strong);
  border-radius: 100px;
  background: transparent;
  color: var(--c-muted);
  cursor: pointer;
  transition: all 0.16s ease;
}

.filter-chip:hover {
  border-color: var(--c-navy);
  color: var(--c-navy);
}

.filter-chip.is-active {
  background: var(--c-navy);
  border-color: var(--c-navy);
  color: #fff;
}

/* 文章列表：单列列表式。
   篇数不确定时不会出现网格空位，同时更接近研究型内容的目录观感。 */
.article-list {
  border-top: 1px solid var(--c-border);
}

.article-list .article-card {
  border-bottom: 1px solid var(--c-border);
}

.article-card[hidden] {
  display: none;
}

.article-card__link {
  display: grid;
  grid-template-columns: 116px minmax(0, 1fr) 132px;
  gap: 36px;
  align-items: start;
  padding: 32px 4px 34px;
  color: inherit;
  transition: background-color 0.18s ease;
}

.article-card__link:hover {
  text-decoration: none;
  background: var(--c-tint);
}

.article-card__category {
  font-family: var(--font-mono);
  font-size: 11.5px;
  letter-spacing: 0.1em;
  color: var(--c-teal);
  padding-top: 7px;
}

.article-card__title {
  font-size: 20px;
  line-height: 1.5;
  letter-spacing: -0.012em;
  transition: color 0.18s ease;
}

.article-card__link:hover .article-card__title {
  color: var(--c-teal-dark);
}

.article-card__summary {
  margin-top: 10px;
  font-size: 14.5px;
  line-height: 1.85;
  color: var(--c-muted);
  max-width: 46em;
}

.article-card__meta {
  font-size: 12.5px;
  color: var(--c-muted);
  display: flex;
  flex-direction: column;
  gap: 6px;
  padding-top: 7px;
  text-align: right;
}

.article-card__dot {
  display: none;
}

.empty-state {
  padding: 60px 0;
  text-align: center;
  font-size: 14.5px;
  color: var(--c-muted);
}

/* --------------------------------------------------------------- Article */

.article__header {
  background: var(--c-navy);
  color: var(--c-on-dark);
  padding-top: calc(var(--header-h) + 64px);
  padding-bottom: 64px;
  border-bottom: 1px solid var(--c-border-dark);
}

.article__shell {
  max-width: var(--shell-narrow);
}

.breadcrumb {
  display: flex;
  gap: 10px;
  font-size: 12.5px;
  color: var(--c-on-dark-muted);
  margin-bottom: 32px;
}

.breadcrumb a {
  color: var(--c-on-dark-muted);
}

.breadcrumb a:hover {
  color: var(--c-teal-bright);
}

.article__category {
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.14em;
  color: var(--c-teal-bright);
  margin-bottom: 20px;
}

.article__title {
  font-size: clamp(26px, 3vw, 40px);
  line-height: 1.3;
  letter-spacing: -0.022em;
  color: #fff;
}

.article__summary {
  margin-top: 24px;
  font-size: 16.5px;
  line-height: 1.85;
  color: var(--c-on-dark);
  opacity: 0.82;
}

.article-meta {
  margin-top: 30px;
  font-size: 13px;
  color: var(--c-on-dark-muted);
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
  align-items: center;
}

.article-meta__sep {
  color: var(--c-border-dark);
}

.article__body {
  padding: 72px 0 8px;
}

.prose {
  font-size: 16.5px;
  line-height: 1.95;
  color: var(--c-text);
}

.prose > * + * {
  margin-top: 26px;
}

.prose h2 {
  font-size: 22px;
  margin-top: 56px;
  letter-spacing: -0.015em;
  padding-top: 8px;
}

.prose p {
  color: var(--c-text);
  opacity: 0.92;
}

.prose .callout {
  background: var(--c-tint);
  border-left: 3px solid var(--c-teal);
  border-radius: 0 var(--r-sm) var(--r-sm) 0;
  padding: 20px 24px;
  margin-top: 34px;
}

.prose .callout p {
  font-size: 14.5px;
  line-height: 1.85;
  color: var(--c-muted);
  margin: 0;
  opacity: 1;
}

.prose ul {
  padding-left: 22px;
  list-style: disc;
}

.prose li {
  margin-top: 10px;
  color: var(--c-text);
  opacity: 0.92;
}

.article__sources {
  padding: 56px 0;
  background: var(--c-tint);
  border-top: 1px solid var(--c-border);
  border-bottom: 1px solid var(--c-border);
}

.sources-title {
  font-size: 15px;
  letter-spacing: 0.04em;
  margin-bottom: 26px;
  color: var(--c-navy);
}

.sources-list {
  display: flex;
  flex-direction: column;
  gap: 20px;
}

.source-item {
  padding-left: 22px;
  position: relative;
}

.source-item::before {
  content: "";
  position: absolute;
  left: 0;
  top: 0.72em;
  width: 10px;
  height: 1px;
  background: var(--c-teal);
}

.source-item dt {
  font-size: 14px;
  font-weight: 500;
  margin-bottom: 6px;
  color: var(--c-navy);
}

.source-item dd {
  font-size: 13.5px;
  line-height: 1.85;
  color: var(--c-muted);
}

.sources-note {
  margin-top: 28px;
  font-size: 12.5px;
  color: var(--c-muted);
  padding-top: 20px;
  border-top: 1px dashed var(--c-border-strong);
}

/* ------------------------------------------------------------------ About */

.about-shell {
  max-width: var(--shell-narrow);
}

.about-block__title {
  font-size: clamp(21px, 2vw, 27px);
  margin-bottom: 22px;
  letter-spacing: -0.015em;
}

.about-block__text {
  font-size: 16.5px;
  line-height: 1.95;
  color: var(--c-text);
  opacity: 0.9;
}

.about-block__text--muted {
  font-size: 14.5px;
  color: var(--c-muted);
  opacity: 1;
  margin-bottom: 28px;
}

.about-block__note {
  margin-top: 26px;
  font-size: 13px;
  color: var(--c-muted);
}

.principles-grid {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 1px;
  background: var(--c-border);
  border: 1px solid var(--c-border);
  margin-top: 44px;
}

.principle {
  background: var(--c-tint);
  padding: 34px 32px 36px;
}

.principle__no {
  font-family: var(--font-mono);
  font-size: 11.5px;
  color: var(--c-teal);
  letter-spacing: 0.12em;
  display: block;
  margin-bottom: 16px;
}

.principle__title {
  font-size: 18px;
  margin-bottom: 12px;
  letter-spacing: -0.01em;
}

.principle__text {
  font-size: 14.5px;
  line-height: 1.85;
  color: var(--c-muted);
}

.building-grid {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 0;
  border-top: 1px solid var(--c-border);
  margin-top: 44px;
}

.building-item {
  padding: 32px 30px 36px;
  border-right: 1px solid var(--c-border);
  border-bottom: 1px solid var(--c-border);
}

.building-item:first-child {
  padding-left: 0;
}

.building-item:last-child {
  border-right: 0;
  padding-right: 0;
}

.building-item__name {
  font-size: 17px;
  margin-bottom: 14px;
}

.building-item__text {
  font-size: 14px;
  line-height: 1.85;
  color: var(--c-muted);
}

.entity-list {
  border-top: 1px solid var(--c-border);
}

.entity-row {
  display: grid;
  grid-template-columns: 140px 1fr;
  gap: 20px;
  padding: 16px 0;
  border-bottom: 1px solid var(--c-border);
  align-items: baseline;
}

.entity-row dt {
  font-size: 13.5px;
  color: var(--c-muted);
}

.entity-row dd {
  font-size: 15px;
}

/* 占位符：明确标注待补充，且不做成可点击链接 */
.placeholder-value {
  display: inline-block;
  font-family: var(--font-mono);
  font-size: 13px;
  color: #8a6d1f;
  background: var(--c-warn-soft);
  border: 1px dashed var(--c-warn);
  border-radius: var(--r-xs);
  padding: 3px 10px;
}

/* ---------------------------------------------------------------- Privacy */

.prose--legal {
  font-size: 15.5px;
  line-height: 1.95;
}

.privacy-section + .privacy-section {
  margin-top: 48px;
}

.privacy-section h2 {
  font-size: 19px;
  margin-bottom: 18px;
  letter-spacing: -0.01em;
}

.privacy-section p {
  margin-top: 14px;
}

.privacy-list {
  margin-top: 18px;
  padding-left: 22px;
  list-style: disc;
  border-left: 1px solid var(--c-border);
}

.privacy-list li {
  margin-top: 8px;
  font-size: 15px;
  color: var(--c-text);
  opacity: 0.9;
}

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

.cta-block {
  max-width: 760px;
}

.cta-block__title {
  font-size: clamp(24px, 2.6vw, 34px);
  letter-spacing: -0.02em;
  margin-bottom: 18px;
}

.cta-block__text {
  font-size: 16px;
  line-height: 1.85;
  margin-bottom: 32px;
}

.cta-block--dark .cta-block__title {
  color: #fff;
}

.cta-block--dark .cta-block__text {
  color: var(--c-on-dark-muted);
}

.cta-block--dark .section-head__meta {
  margin-bottom: 24px;
}

.cta-block__actions {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 16px 24px;
}

.cta-block__footnote {
  font-size: 13.5px;
  color: var(--c-on-dark-muted);
}

/* ---------------------------------------------------------------- Footer */

.site-footer {
  background: var(--c-deep);
  color: var(--c-on-dark-muted);
  padding: 72px 0 40px;
  border-top: 1px solid var(--c-border-dark);
}

.site-footer__top {
  display: grid;
  grid-template-columns: minmax(0, 1.4fr) minmax(0, 1fr) minmax(0, 1.2fr);
  gap: 48px;
  padding-bottom: 48px;
  border-bottom: 1px solid var(--c-border-dark);
}

.site-footer__name {
  font-size: 19px;
  color: #fff;
  font-weight: 600;
  letter-spacing: 0.03em;
  margin-bottom: 10px;
}

.site-footer__tagline {
  font-size: 14px;
  line-height: 1.8;
}

.site-footer__nav ul {
  display: flex;
  flex-direction: column;
  gap: 12px;
}

.site-footer__nav a {
  color: var(--c-on-dark-muted);
  font-size: 14.5px;
}

.site-footer__nav a:hover {
  color: var(--c-teal-bright);
  text-decoration: none;
}

.site-footer__contact dl {
  display: flex;
  flex-direction: column;
  gap: 14px;
}

.contact-row {
  display: grid;
  grid-template-columns: 84px 1fr;
  gap: 14px;
  align-items: baseline;
}

.contact-row dt {
  font-size: 12.5px;
  color: var(--c-on-dark-muted);
  opacity: 0.75;
}

.contact-row dd {
  font-size: 14px;
  color: var(--c-on-dark);
  word-break: break-all;
}

.contact-row a {
  color: var(--c-teal-bright);
}

.site-footer__bottom {
  padding-top: 28px;
  display: flex;
  flex-wrap: wrap;
  justify-content: space-between;
  gap: 14px;
  font-size: 12.5px;
}

.site-footer__copy {
  color: var(--c-on-dark-muted);
}

.site-footer__note {
  color: var(--c-on-dark-muted);
  opacity: 0.72;
}

/* ------------------------------------------------------------ Responsive */

@media (max-width: 1080px) {
  :root {
    --section-y: 88px;
  }

  .hero__inner {
    grid-template-columns: 1fr;
    gap: 56px;
  }

  .hero__visual-wrap {
    order: 2;
  }

  .hero-visual {
    max-width: 520px;
  }

  .trust-grid {
    grid-template-columns: 1fr;
    gap: 56px;
  }

  .trust-grid__deliverable {
    grid-template-columns: 160px minmax(0, 1fr);
  }

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

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

  .approach__item:nth-child(2n) {
    border-right: 0;
    padding-right: 0;
  }

  .approach__item:nth-child(odd) {
    padding-left: 0;
  }

  .building-grid {
    grid-template-columns: 1fr;
  }

  .building-item {
    padding-left: 0 !important;
    padding-right: 0 !important;
    border-right: 0;
  }

  .section-head {
    grid-template-columns: 1fr;
    gap: 18px;
    margin-bottom: 48px;
  }

  .section-head__meta {
    flex-direction: row;
    align-items: baseline;
    gap: 14px;
    padding-top: 0;
  }

  .site-footer__top {
    grid-template-columns: 1fr 1fr;
    gap: 40px;
  }
}

@media (max-width: 860px) {
  .site-nav {
    display: none;
  }

  .nav-toggle {
    display: block;
  }

  .stats-grid {
    grid-template-columns: 1fr;
  }

  .data-card,
  .data-card:first-child,
  .data-card:last-child {
    padding: 30px 0 34px;
    border-right: 0;
  }

  .data-card:first-child {
    border-top: 0;
  }

  .issues-grid {
    grid-template-columns: 1fr;
  }

  .article-card__link {
    grid-template-columns: 1fr;
    gap: 14px;
    padding: 28px 0 30px;
  }

  .article-card__category {
    padding-top: 0;
  }

  .article-card__meta {
    flex-direction: row;
    gap: 10px;
    padding-top: 0;
    text-align: left;
  }

  .article-card__dot {
    display: inline;
    color: var(--c-border-strong);
  }

  .principles-grid {
    grid-template-columns: 1fr;
  }
}

@media (max-width: 720px) {
  :root {
    --section-y: 64px;
    --header-h: 62px;
  }

  .shell {
    padding: 0 20px;
  }

  body {
    font-size: 15.5px;
  }

  .hero {
    padding-top: calc(var(--header-h) + 48px);
    padding-bottom: 56px;
  }

  .hero__title {
    font-size: clamp(28px, 8.4vw, 38px);
  }

  .hero__subtitle {
    margin-top: 22px;
    font-size: 15px;
  }

  .hero__actions {
    margin-top: 32px;
    gap: 16px;
  }

  .hero__actions .btn {
    width: 100%;
  }

  .hero__reassurances {
    flex-direction: column;
    gap: 10px;
    margin-top: 30px;
  }

  .page-hero {
    padding-top: calc(var(--header-h) + 44px);
    padding-bottom: 52px;
  }

  .page-hero__title {
    font-size: clamp(25px, 7.4vw, 32px);
  }

  /* 移动端：漏斗改横向滑动，不压缩字号 */
  .funnel {
    overflow-x: auto;
    -webkit-overflow-scrolling: touch;
    scrollbar-width: none;
    margin-left: -20px;
    margin-right: -20px;
    padding-left: 20px;
    padding-right: 20px;
    border-left: 0;
    border-right: 0;
  }

  .funnel::-webkit-scrollbar {
    display: none;
  }

  .funnel__list {
    grid-template-columns: none;
    grid-auto-flow: column;
    grid-auto-columns: minmax(112px, 1fr);
    min-width: max-content;
  }

  .funnel__hint {
    display: block;
    margin-top: 14px;
    font-size: 12px;
    color: var(--c-muted);
    text-align: center;
  }

  .industries-grid,
  .approach {
    grid-template-columns: 1fr;
  }

  .approach__item,
  .approach__item:nth-child(2n),
  .approach__item:nth-child(odd) {
    padding: 26px 0 30px;
    border-right: 0;
  }

  .trust-grid__deliverable {
    grid-template-columns: 1fr;
    gap: 36px;
  }

  .report-cover {
    max-width: 200px;
  }

  .section-conclusion {
    margin-top: 44px;
    padding-top: 26px;
  }

  /* 移动端：所有可点击元素保证足够触控高度（≥44px） */
  .header-cta,
  .btn--ghost,
  .filter-chip,
  .nav-toggle {
    min-height: 44px;
  }

  .header-cta {
    padding: 0 16px;
  }

  .filter-chip {
    display: inline-flex;
    align-items: center;
  }

  /* 表单：移动端全宽按钮、输入框加高、选项单列 */
  .form-shell {
    max-width: 100%;
  }

  .choices {
    grid-template-columns: 1fr;
  }

  .choice__label {
    min-height: 56px;
    font-size: 15.5px;
  }

  .field__input {
    min-height: 52px;
    font-size: 16px; /* iOS 上小于 16px 会触发缩放 */
  }

  .form-nav {
    flex-direction: column-reverse;
    align-items: stretch;
    gap: 12px;
  }

  .form-nav .btn {
    width: 100%;
  }

  .form-nav__spacer {
    display: none;
  }

  .success-card {
    padding: 36px 24px;
  }

  .success-card__actions {
    flex-direction: column;
    align-items: flex-start;
    gap: 14px;
  }

  .entity-row {
    grid-template-columns: 1fr;
    gap: 6px;
  }

  .site-footer {
    padding-top: 56px;
  }

  .site-footer__top {
    grid-template-columns: 1fr;
    gap: 36px;
  }

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

  .article__body {
    padding-top: 48px;
  }

  .prose {
    font-size: 16px;
  }

  .prose h2 {
    font-size: 19.5px;
    margin-top: 44px;
  }

  .article__sources {
    padding: 40px 0;
  }

  .filter-bar {
    gap: 14px;
  }
}

@media (max-width: 420px) {
  .header-cta {
    padding: 9px 13px;
    font-size: 13px;
  }

  .brand__en {
    display: none;
  }
}

/* -------------------------------------------------- Motion & print rules */

/* 进入视口的轻微淡入。class 由 site.js 添加，
   JS 不可用时不会命中，内容始终可见。 */
.js-reveal {
  opacity: 0;
  transform: translateY(12px);
  transition: opacity 0.55s ease, transform 0.55s ease;
}

.js-reveal.is-visible {
  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;
  }

  .hv-flow {
    stroke-dasharray: none;
  }

  /* 光点由 SVG animateMotion 驱动，CSS 无法停止，直接隐藏 */
  .hv-particles {
    display: none;
  }
}

@media print {
  .site-header,
  .mobile-nav,
  .cta-block__actions,
  .form-nav {
    display: none;
  }

  body {
    color: #000;
  }
}