/* ==========================================================================
   灵驭智元AI · 设计系统
   风格来源：编辑排版风（Editorial）—— 暖纸底 / 宋体标题 / 全直角 / 细线分隔
   ========================================================================== */

:root {
  /* 色彩 */
  --paper: #F6F4EF;
  --paper-raised: #FAF9F5;
  --paper-deep: #EFEEE9;
  --ink: #111418;
  --ink-2: #414B55;
  --muted: #57667E;
  --muted-soft: #62718A;
  --blue: #FF575E;
  --blue-deep: #E23A42;
  --blue-bright: #FF7A80;
  --mist: #FFF0F1;
  --line: #D6DCE2;
  --line-soft: #E3E0D8;
  --white: #FFFFFF;

  /* 字体 */
  --font-sans: "Noto Sans SC", "PingFang SC", "Microsoft YaHei", "Helvetica Neue", Arial, sans-serif;
  --font-serif: "Noto Serif SC", "Source Han Serif SC", "Songti SC", "STSong", "SimSun", serif;

  /* 版心 */
  --canvas: 1440px;
  --content: 1160px;
  --reading: 740px;
  --gutter: clamp(20px, 4.4vw, 72px);
  --header-h: 76px;

  /* 节奏 */
  --ease: cubic-bezier(.22, .61, .36, 1);
  --t: .36s;
}

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

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

body {
  margin: 0;
  background: var(--paper);
  color: var(--ink);
  font-family: var(--font-sans);
  font-size: 16px;
  line-height: 1.7;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

img, svg { display: block; max-width: 100%; }
a { color: inherit; text-decoration: none; }
button { font: inherit; color: inherit; background: none; border: 0; cursor: pointer; }

::selection { background: var(--blue); color: #fff; }

.skip-link {
  position: absolute; left: -9999px; top: 0; z-index: 999;
  background: var(--blue); color: #fff; padding: 10px 18px;
}
.skip-link:focus { left: 12px; top: 12px; }

/* ---------- 版心 ---------- */
.wrap {
  width: 100%;
  max-width: calc(var(--content) + var(--gutter) * 2);
  margin: 0 auto;
  padding-inline: var(--gutter);
}
.wrap--wide { max-width: calc(var(--canvas) + var(--gutter) * 2); }
.wrap--read { max-width: calc(var(--reading) + var(--gutter) * 2); }

/* ---------- 眉标 eyebrow ---------- */
.eyebrow {
  margin: 0 0 20px;
  font-family: var(--font-sans);
  font-size: 14px;
  font-weight: 600;
  line-height: 1.7;
  letter-spacing: .08em;
  color: var(--blue);
}
.eyebrow--ink { color: var(--muted); }

/* ---------- 标题 ---------- */
h1, h2, h3, h4 {
  font-family: var(--font-serif);
  font-weight: 650;
  margin: 0;
  color: var(--ink);
}

.h-display {
  font-size: clamp(38px, 5.2vw, 72px);
  line-height: 1.25;
  letter-spacing: -.04em;
}

/* 首屏主标题：强制单行不换行
   这行字（所有生意，都需要用AI重做一遍。）实测宽度 = 14.7 × 字号，
   所以字号必须由容器可用宽度反推，否则窄屏一定溢出。
   容器内容宽 = min(1160px, 100vw - 2×gutter)，gutter = clamp(20px, 4.4vw, 72px)。
   除数取 15.5（相对 14.7 留约 5% 余量）：CJK 字形宽度在各系统上稳定，
   只有 "AI" 两个拉丁字符有差异，5% 足够覆盖，同时视觉上仍近乎满宽。
   换字号时务必同步重算这个除数，否则会溢出或留白过大。 */
.hero-title {
  font-size: calc((100vw - 40px) / 15.5);   /* 窄屏：gutter 固定 20px */
  line-height: 1.14;
  margin: 0;
  white-space: nowrap;
  overflow-wrap: normal;
  word-break: keep-all;
}
@media (min-width: 456px) {
  .hero-title { font-size: 5.88vw; }        /* gutter 变为 4.4vw 后：91.2vw / 15.5 */
}
@media (min-width: 1272px) {
  .hero-title { font-size: 74.8px; }        /* 容器触顶 1160px 后固定：1160 / 15.5 */
}
.h1 {
  font-size: clamp(34px, 4.4vw, 62px);
  line-height: 1.22;
  letter-spacing: -.04em;
}
.h2 {
  font-size: clamp(28px, 3.2vw, 42px);
  line-height: 1.28;
  letter-spacing: -.03em;
}
.h3 {
  font-size: clamp(22px, 2.4vw, 30px);
  line-height: 1.4;
  letter-spacing: -.02em;
}
.h4 {
  font-family: var(--font-sans);
  font-size: 18px;
  font-weight: 600;
  line-height: 1.45;
  letter-spacing: -.02em;
}

.lead {
  font-family: var(--font-sans);
  font-size: clamp(16px, 1.4vw, 18px);
  line-height: 1.75;
  color: var(--ink-2);
  margin: 22px 0 0;
}
.body-text {
  font-size: 16px;
  line-height: 1.8;
  color: var(--ink-2);
  margin: 0 0 16px;
}
.body-text:last-child { margin-bottom: 0; }
.small { font-size: 14px; line-height: 1.7; color: var(--muted); }
.tiny { font-size: 13px; line-height: 1.6; color: var(--muted-soft); letter-spacing: .01em; }

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

/* ---------- 按钮 ---------- */
.btn {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  padding: 13px 26px;
  border-radius: 0;
  font-size: 16px;
  font-weight: 600;
  letter-spacing: .01em;
  line-height: 1;
  transition: background var(--t) var(--ease), color var(--t) var(--ease),
              border-color var(--t) var(--ease);
}
.btn--primary {
  background: var(--blue);
  color: var(--ink);
  border: 1px solid var(--blue);
}
.btn--primary:hover { background: var(--blue-deep); border-color: var(--blue-deep); }

.btn--ghost {
  background: transparent;
  color: var(--ink);
  border: 1px solid var(--line);
}
.btn--ghost:hover { border-color: var(--ink); }

.btn--onblue {
  background: #fff;
  color: var(--ink);
  border: 1px solid #fff;
}
.btn--onblue:hover { background: var(--paper); border-color: var(--paper); }

.btn .arrow {
  display: inline-block;
  transition: transform var(--t) var(--ease);
}
.btn:hover .arrow { transform: translateX(4px); }

/* ---------- 头部 ---------- */
.site-header {
  position: sticky;
  top: 0;
  z-index: 60;
  height: var(--header-h);
  display: flex;
  align-items: center;
  background: rgba(246, 244, 239, .94);
  backdrop-filter: saturate(160%) blur(10px);
  border-bottom: 1px solid transparent;
  transition: border-color .25s var(--ease), background .25s var(--ease);
}
.site-header.is-scrolled {
  border-bottom-color: var(--line);
  background: rgba(250, 249, 245, .96);
}

.header-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 32px;
  width: 100%;
}

.brand {
  display: flex;
  align-items: baseline;
  gap: 10px;
  flex-shrink: 0;
}
.brand-name {
  font-family: var(--font-serif);
  font-size: 20px;
  font-weight: 650;
  letter-spacing: -.01em;
}
.brand-tag {
  font-size: 12px;
  color: var(--muted);
  letter-spacing: .06em;
}

.nav {
  display: flex;
  align-items: center;
  gap: 30px;
  margin-left: auto;
}
.nav a {
  position: relative;
  font-size: 15px;
  color: var(--ink-2);
  padding: 6px 0;
  transition: color .2s var(--ease);
}
.nav a::after {
  content: "";
  position: absolute;
  left: 0; bottom: 0;
  width: 100%; height: 1px;
  background: var(--ink);
  transform: scaleX(0);
  transform-origin: left;
  transition: transform .28s var(--ease);
}
.nav a:hover { color: var(--ink); }
.nav a:hover::after,
.nav a[aria-current="page"]::after { transform: scaleX(1); }
.nav a[aria-current="page"] { color: var(--ink); font-weight: 500; }

.header-cta { flex-shrink: 0; }
.header-cta .btn { padding: 10px 20px; font-size: 14px; }

.menu-toggle {
  display: none;
  width: 40px; height: 40px;
  align-items: center; justify-content: center;
  margin-left: auto;
}
.menu-toggle span {
  position: relative;
  display: block;
  width: 20px; height: 1px;
  background: var(--ink);
  transition: background .2s;
}
.menu-toggle span::before,
.menu-toggle span::after {
  content: "";
  position: absolute; left: 0;
  width: 20px; height: 1px;
  background: var(--ink);
  transition: transform .3s var(--ease), top .3s var(--ease);
}
.menu-toggle span::before { top: -6px; }
.menu-toggle span::after { top: 6px; }
.menu-toggle[aria-expanded="true"] span { background: transparent; }
.menu-toggle[aria-expanded="true"] span::before { top: 0; transform: rotate(45deg); }
.menu-toggle[aria-expanded="true"] span::after { top: 0; transform: rotate(-45deg); }

/* ---------- 首屏 ---------- */
.hero {
  padding: clamp(56px, 8vw, 110px) 0 clamp(48px, 6vw, 84px);
}
.hero-grid {
  display: grid;
  grid-template-columns: minmax(0, 1.15fr) minmax(0, .85fr);
  gap: clamp(32px, 5vw, 80px);
  align-items: center;
  margin-top: clamp(26px, 3.6vw, 52px);
}
.hero-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 14px;
  margin-top: 40px;
}
.hero-meta {
  display: flex;
  flex-wrap: wrap;
  gap: 28px;
  margin-top: 48px;
  padding-top: 24px;
  border-top: 1px solid var(--line);
}
.hero-meta div { font-size: 14px; color: var(--muted); }
.hero-meta strong {
  display: block;
  font-family: var(--font-serif);
  font-size: 22px;
  font-weight: 650;
  color: var(--ink);
  letter-spacing: -.02em;
  margin-bottom: 2px;
}

/* 飞轮图 */
.flywheel {
  position: relative;
  aspect-ratio: 1 / 1;
  width: 100%;
  max-width: 420px;
  margin-inline: auto;
}
.flywheel svg { width: 100%; height: auto; }
.flywheel-text {
  font-family: var(--font-sans);
  font-size: 13px;
  fill: var(--ink-2);
  letter-spacing: .04em;
}
.flywheel-text--blue { fill: var(--blue); font-weight: 600; }

/* ---------- 区块 ---------- */
.section { padding: clamp(56px, 7vw, 104px) 0; }
.section--tight { padding: clamp(40px, 5vw, 72px) 0; }
.section--paper { background: var(--paper-raised); }
.section--deep { background: var(--paper-deep); }

.section-head {
  display: flex;
  align-items: flex-end;
  justify-content: space-between;
  gap: 32px;
  padding-bottom: 26px;
  border-bottom: 1px solid var(--line);
  margin-bottom: 8px;
}
.section-head__main { max-width: 720px; }
.section-head .link-more { flex-shrink: 0; }

.link-more {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  font-size: 14px;
  font-weight: 600;
  color: var(--blue);
  padding-bottom: 2px;
  border-bottom: 1px solid transparent;
  transition: border-color .2s var(--ease);
}
.link-more:hover { border-bottom-color: var(--blue); }
.link-more .arrow { transition: transform .2s var(--ease); }
.link-more:hover .arrow { transform: translateX(3px); }

/* ---------- 线列（工具/服务列表） ---------- */
.line-list { list-style: none; margin: 0; padding: 0; }
.line-list > li {
  border-bottom: 1px solid var(--line);
}
.line-item {
  display: grid;
  grid-template-columns: 64px minmax(0, 1fr) minmax(0, 1.15fr) auto;
  align-items: baseline;
  gap: clamp(14px, 2.4vw, 40px);
  padding: 26px 0;
  transition: padding-left var(--t) var(--ease);
}
.line-list > li:hover .line-item { padding-left: 10px; }

.line-item__no {
  font-family: var(--font-sans);
  font-size: 13px;
  font-weight: 500;
  color: var(--muted-soft);
  letter-spacing: .08em;
  font-variant-numeric: tabular-nums;
}
.line-item__title {
  font-family: var(--font-serif);
  font-size: clamp(19px, 1.9vw, 24px);
  font-weight: 650;
  letter-spacing: -.02em;
  line-height: 1.4;
}
.line-item__desc {
  font-size: 15px;
  line-height: 1.7;
  color: var(--muted);
}
.line-item__go {
  font-size: 13px;
  color: var(--muted-soft);
  letter-spacing: .04em;
  white-space: nowrap;
}

/* ---------- 卡片网格 ---------- */
.grid-3 {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 0;
}
.grid-2 {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 0;
}

.card {
  padding: 32px 28px 36px;
  border-top: 1px solid var(--line);
  border-right: 1px solid var(--line);
  background: transparent;
  transition: background var(--t) var(--ease);
}
.grid-3 .card:nth-child(3n) { border-right: 0; }
.grid-2 .card:nth-child(2n) { border-right: 0; }
.card:hover { background: rgba(255, 255, 255, .55); }

.card__no {
  font-size: 12px;
  font-weight: 600;
  letter-spacing: .1em;
  color: var(--blue);
  margin-bottom: 18px;
  font-variant-numeric: tabular-nums;
}
.card__title {
  font-family: var(--font-serif);
  font-size: 22px;
  font-weight: 650;
  letter-spacing: -.02em;
  line-height: 1.4;
  margin-bottom: 12px;
}
.card__desc {
  font-size: 15px;
  line-height: 1.75;
  color: var(--muted);
  margin: 0;
}
.card__foot {
  margin-top: 22px;
  font-size: 13px;
  color: var(--muted-soft);
  letter-spacing: .04em;
}

/* ---------- 案例条目 ---------- */
.case-list { list-style: none; margin: 0; padding: 0; }
.case-row {
  display: grid;
  grid-template-columns: minmax(0, 1.05fr) minmax(0, 1fr) auto;
  align-items: center;
  gap: clamp(16px, 3vw, 56px);
  padding: 30px 0;
  border-bottom: 1px solid var(--line);
  transition: padding-left var(--t) var(--ease);
}
.case-row:hover { padding-left: 10px; }
.case-row__tag {
  font-size: 13px;
  font-weight: 600;
  color: var(--blue);
  letter-spacing: .06em;
  margin-bottom: 8px;
}
.case-row__title {
  font-family: var(--font-serif);
  font-size: clamp(20px, 2.1vw, 26px);
  font-weight: 650;
  letter-spacing: -.02em;
  line-height: 1.35;
}
.case-row__desc { font-size: 15px; line-height: 1.75; color: var(--muted); margin: 0; }
.case-row__arrow { font-size: 18px; color: var(--muted-soft); }

/* ---------- 三栏特征 ---------- */
.feature-3 {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 0;
  border-top: 1px solid var(--line);
}
.feature {
  padding: 40px 32px 44px 0;
  border-right: 1px solid var(--line);
}
.feature + .feature { padding-left: 32px; }
.feature:last-child { border-right: 0; padding-right: 0; }
.feature__k {
  font-family: var(--font-serif);
  font-size: 30px;
  font-weight: 650;
  letter-spacing: -.02em;
  margin-bottom: 14px;
}
.feature__d { font-size: 15px; line-height: 1.8; color: var(--muted); margin: 0; }

/* ---------- 收尾带 ---------- */
.closing-band {
  margin-top: clamp(56px, 7vw, 104px);
  padding: clamp(48px, 6vw, 88px) 0;
  background: var(--ink);
  color: var(--paper);
}
.closing-band h2 {
  color: #fff;
  max-width: 800px;
}
.closing-band .lead { color: rgba(255, 255, 255, .68); }
.closing-band__row {
  display: flex;
  align-items: flex-end;
  justify-content: space-between;
  gap: 40px;
  flex-wrap: wrap;
}

/* 蓝色邀请带 */
.blue-band {
  background: var(--blue);
  color: var(--ink);
  padding: clamp(44px, 5.4vw, 76px) 0;
}
.blue-band h2 { color: var(--ink); max-width: 780px; }
.blue-band p {
  color: rgba(17, 20, 24, .75);
  font-size: 16px;
  line-height: 1.75;
  margin: 18px 0 0;
  max-width: 640px;
}
.blue-band__row {
  display: flex; align-items: center; justify-content: space-between;
  gap: 36px; flex-wrap: wrap;
}

/* ---------- 页脚 ---------- */
.site-footer {
  background: var(--paper);
  border-top: 1px solid var(--line);
  padding: 56px 0 36px;
}
.footer-top {
  display: grid;
  grid-template-columns: minmax(0, 1.4fr) repeat(3, minmax(0, 1fr));
  gap: 40px;
  padding-bottom: 40px;
  border-bottom: 1px solid var(--line);
}
.footer-brand .brand-name { font-size: 22px; }
.footer-brand p {
  margin: 14px 0 0;
  font-size: 14px;
  line-height: 1.8;
  color: var(--muted);
  max-width: 300px;
}
.footer-col h4 {
  font-family: var(--font-sans);
  font-size: 13px;
  font-weight: 600;
  letter-spacing: .08em;
  color: var(--muted-soft);
  margin-bottom: 14px;
}
.footer-col ul { list-style: none; margin: 0; padding: 0; }
.footer-col li { margin-bottom: 9px; }
.footer-col a { font-size: 14px; color: var(--ink-2); transition: color .2s; }
.footer-col a:hover { color: var(--blue); }
.footer-bottom {
  display: flex;
  justify-content: space-between;
  gap: 20px;
  flex-wrap: wrap;
  padding-top: 24px;
  font-size: 13px;
  color: var(--muted-soft);
}
.footer-legal a {
  color: var(--muted-soft);
  transition: color .2s var(--ease);
  border-bottom: 1px solid transparent;
}
.footer-legal a:hover {
  color: var(--ink-2);
  border-bottom-color: var(--line);
}

/* ---------- 页面封面 ---------- */
.page-cover {
  padding: clamp(40px, 5vw, 72px) 0 clamp(36px, 4vw, 56px);
  border-bottom: 1px solid var(--line);
}
.breadcrumb {
  display: flex;
  gap: 8px;
  font-size: 13px;
  color: var(--muted-soft);
  margin-bottom: 30px;
}
.breadcrumb a:hover { color: var(--blue); }
.breadcrumb span { color: var(--line); }
.page-cover h1 { max-width: 900px; }
.page-cover .lead { max-width: 640px; }

/* ---------- 分节标题 ---------- */
.block-head {
  display: flex;
  align-items: baseline;
  gap: 18px;
  padding-bottom: 20px;
  border-bottom: 1px solid var(--line);
  margin-bottom: 4px;
}
.block-head__idx {
  font-size: 13px;
  font-weight: 600;
  letter-spacing: .1em;
  color: var(--blue);
  font-variant-numeric: tabular-nums;
}
.block-head h2 { font-size: clamp(24px, 2.6vw, 32px); letter-spacing: -.025em; }
.block-head__note { margin-left: auto; font-size: 14px; color: var(--muted); }
/* 带工作台入口时，说明文字让位，入口链接靠右 */
.block-head--with-cta .block-head__note { margin-left: 0; }
.block-head__cta { margin-left: auto; white-space: nowrap; }

@media (max-width: 900px) {
  .block-head--with-cta { flex-wrap: wrap; row-gap: 10px; }
  .block-head--with-cta .block-head__cta { margin-left: 0; }
}

/* ---------- 双栏文字 ---------- */
.two-col {
  display: grid;
  grid-template-columns: minmax(0, .9fr) minmax(0, 1.1fr);
  gap: clamp(28px, 5vw, 80px);
  align-items: start;
}
.two-col--read { grid-template-columns: minmax(0, 1fr) minmax(0, 1.35fr); }

/* ---------- 创始人 ---------- */
.founder {
  display: grid;
  grid-template-columns: minmax(0, .8fr) minmax(0, 1.2fr);
  gap: clamp(32px, 6vw, 96px);
  align-items: start;
}
.founder__name {
  font-family: var(--font-serif);
  font-size: clamp(36px, 4.2vw, 52px);
  font-weight: 650;
  letter-spacing: -.03em;
  line-height: 1.15;
  margin-bottom: 16px;
}
.founder__role {
  font-size: 15px;
  color: var(--blue);
  font-weight: 600;
  line-height: 1.8;
  margin-bottom: 24px;
}
.founder__quote {
  font-family: var(--font-serif);
  font-size: clamp(20px, 2.1vw, 26px);
  line-height: 1.6;
  letter-spacing: -.02em;
  color: var(--ink);
  padding-left: 22px;
  border-left: 2px solid var(--blue);
  margin: 0 0 28px;
}

/* ---------- 时间线 / 阶段 ---------- */
.steps { list-style: none; margin: 0; padding: 0; counter-reset: step; }
.steps > li {
  display: grid;
  grid-template-columns: 56px minmax(0, 1fr);
  gap: 24px;
  padding: 26px 0;
  border-bottom: 1px solid var(--line);
}
.steps > li::before {
  counter-increment: step;
  content: counter(step, decimal-leading-zero);
  font-size: 13px;
  font-weight: 600;
  color: var(--blue);
  letter-spacing: .08em;
  padding-top: 4px;
  font-variant-numeric: tabular-nums;
}
.steps h3 {
  font-family: var(--font-serif);
  font-size: 21px;
  font-weight: 650;
  letter-spacing: -.02em;
  margin-bottom: 8px;
}
.steps p { margin: 0; font-size: 15px; line-height: 1.8; color: var(--muted); }

/* ---------- 二维码卡片 ---------- */
.qr-card {
  border: 1px solid var(--line);
  background: var(--paper-raised);
  padding: 30px 28px 32px;
}
.qr-img {
  display: block;
  width: 220px;
  height: auto;
  margin-top: 22px;
  padding: 8px;
  background: #fff;
  border: 1px solid var(--line);
}
.qr-card .card__foot { margin-top: 14px; }

/* 微信号：等宽、可整段选中，方便长按复制 */
.wxid {
  display: inline-block;
  font-family: ui-monospace, SFMono-Regular, "SF Mono", Menlo, Consolas, monospace;
  font-size: .95em;
  letter-spacing: .02em;
  color: var(--ink);
  padding: 1px 6px;
  border: 1px solid var(--line);
  background: #fff;
  user-select: all;
  -webkit-user-select: all;
}

/* ---------- 二维码占位 / 待填 ---------- */
.qr-slot {
  margin-top: 20px;
  width: 128px;
  height: 128px;
  border: 1px dashed var(--line);
  background: var(--paper-raised);
  display: flex;
  align-items: center;
  justify-content: center;
}
.qr-slot__text {
  font-size: 12px;
  color: var(--muted-soft);
  letter-spacing: .16em;
}
.todo-fill {
  color: var(--muted-soft);
  border-bottom: 1px dashed var(--line);
  padding-bottom: 1px;
}

/* ---------- 资料卡片 ---------- */
.res-grid {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  border-top: 1px solid var(--line);
}
.res-card {
  display: flex;
  flex-direction: column;
  padding: 28px 26px 26px;
  border-right: 1px solid var(--line);
  border-bottom: 1px solid var(--line);
  background: transparent;
  transition: background .28s var(--ease), padding-left .28s var(--ease);
}
.res-grid .res-card:nth-child(3n) { border-right: 0; }
.res-card:hover { background: #fff; padding-left: 32px; }

.res-card__top {
  display: flex;
  align-items: baseline;
  justify-content: space-between;
  gap: 12px;
  margin-bottom: 18px;
  font-size: 12px;
  letter-spacing: .07em;
}
.res-card__type { color: var(--blue); font-weight: 600; }
.res-card__no {
  color: var(--muted-soft);
  font-variant-numeric: tabular-nums;
  letter-spacing: .04em;
}
.res-card__title {
  font-family: var(--font-serif);
  font-size: 23px;
  font-weight: 650;
  letter-spacing: -.02em;
  line-height: 1.4;
  margin-bottom: 12px;
}
.res-card__desc {
  font-size: 14px;
  line-height: 1.75;
  color: var(--muted);
  margin: 0 0 22px;
  flex: 1;
}
.res-card__go {
  font-size: 13px;
  font-weight: 600;
  color: var(--ink-2);
  display: inline-flex;
  align-items: center;
  gap: 6px;
  transition: color .2s var(--ease), gap .2s var(--ease);
}
.res-card:hover .res-card__go { color: var(--blue); gap: 10px; }

@media (max-width: 1080px) {
  .res-grid { grid-template-columns: repeat(2, minmax(0, 1fr)); }
  .res-grid .res-card:nth-child(3n) { border-right: 1px solid var(--line); }
  .res-grid .res-card:nth-child(2n) { border-right: 0; }
  .res-card { padding: 24px 20px; }
  .res-card:hover { padding-left: 24px; }
}
@media (max-width: 640px) {
  .res-grid { grid-template-columns: 1fr; }
  .res-grid .res-card { border-right: 0; }
  .res-card { padding: 22px 18px; }
  .res-card:hover { padding-left: 22px; }
  .res-card__title { font-size: 21px; }
}

/* ---------- 课程入口条 ---------- */
.course-cta {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 32px;
  flex-wrap: wrap;
  margin-top: clamp(36px, 4vw, 52px);
  padding: 28px 32px;
  border-top: 1px solid var(--line);
  border-bottom: 1px solid var(--line);
  background: var(--paper-raised);
}
.course-cta__title {
  font-family: var(--font-serif);
  font-size: clamp(20px, 2.2vw, 26px);
  font-weight: 650;
  letter-spacing: -.02em;
  line-height: 1.4;
  margin-bottom: 6px;
}
.course-cta__meta {
  font-size: 14px;
  color: var(--muted);
  margin: 0;
}
@media (max-width: 560px) {
  .course-cta { flex-direction: column; align-items: stretch; padding: 24px 20px; }
  .course-cta .btn { width: 100%; justify-content: center; }
}

/* ---------- 工作台入口 ---------- */
.wb-entries { margin-top: clamp(44px, 5vw, 72px); }
.wb-entries__head {
  display: flex;
  align-items: baseline;
  justify-content: space-between;
  gap: 20px;
  flex-wrap: wrap;
  margin-bottom: 22px;
}
.wb-entries__head h3 {
  font-family: var(--font-serif);
  font-size: clamp(20px, 2.1vw, 24px);
  font-weight: 650;
  letter-spacing: -.02em;
}
.wb-grid {
  display: grid;
  grid-template-columns: repeat(5, minmax(0, 1fr));
  border-top: 1px solid var(--line);
}
.wb-card {
  display: flex;
  flex-direction: column;
  padding: 24px 18px 26px;
  border-right: 1px solid var(--line);
  border-bottom: 1px solid var(--line);
  background: transparent;
  transition: background .28s var(--ease), padding-left .28s var(--ease);
}
.wb-card:last-child { border-right: 0; }
.wb-card:hover { background: #fff; padding-left: 24px; }

.wb-card__tag {
  font-size: 12px;
  font-weight: 600;
  letter-spacing: .1em;
  color: var(--blue);
  margin-bottom: 14px;
}
.wb-card__title {
  font-family: var(--font-serif);
  font-size: 19px;
  font-weight: 650;
  letter-spacing: -.02em;
  line-height: 1.4;
  margin-bottom: 8px;
}
.wb-card__desc {
  font-size: 13px;
  line-height: 1.7;
  color: var(--muted);
  margin: 0 0 18px;
  flex: 1;
}
.wb-card__go {
  font-size: 13px;
  font-weight: 600;
  color: var(--ink-2);
  display: inline-flex;
  align-items: center;
  gap: 6px;
  transition: color .2s var(--ease), gap .2s var(--ease);
}
.wb-card:hover .wb-card__go { color: var(--blue); gap: 10px; }

@media (max-width: 1080px) {
  .wb-grid { grid-template-columns: repeat(3, minmax(0, 1fr)); }
  .wb-card { border-right: 0; padding: 22px 18px 24px; }
  .wb-card:hover { padding-left: 18px; }
}
@media (max-width: 680px) {
  .wb-grid { grid-template-columns: repeat(2, minmax(0, 1fr)); }
  .wb-card { padding: 20px 14px 22px; }
}
@media (max-width: 460px) {
  .wb-grid { grid-template-columns: 1fr; }
}

/* ---------- 入场动画（渐进增强） ----------
   铁律：内容默认必须可见。只有 JS 就绪（html.js）时才允许先隐藏再点亮。
   这样脚本失效、被拦截、加载慢，页面都不会出现空白。 */
.reveal {
  opacity: 1;
  transform: none;
}

html.js .reveal {
  opacity: 0;
  transform: translateY(14px);
  transition: opacity .7s var(--ease), transform .7s var(--ease);
}
html.js .reveal.is-in {
  opacity: 1;
  transform: none;
}

/* 移动端直接关闭入场动画：小屏滚动频繁、触发不稳定，收益远小于风险 */
@media (max-width: 900px) {
  html.js .reveal,
  html.js .reveal.is-in {
    opacity: 1 !important;
    transform: none !important;
    transition: none !important;
  }
}

@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
  html.js .reveal {
    opacity: 1 !important;
    transform: none !important;
    transition: none !important;
  }
  * { animation-duration: .01ms !important; transition-duration: .01ms !important; }
}

/* ---------- 响应式 ---------- */
@media (max-width: 1080px) {
  .footer-top { grid-template-columns: repeat(2, minmax(0, 1fr)); }
  .line-item { grid-template-columns: 48px minmax(0, 1fr) auto; }
  .line-item__desc { display: none; }
}

@media (max-width: 900px) {
  :root { --header-h: 64px; --gutter: 22px; }

  .nav { display: none; }
  .header-cta { display: none; }
  .menu-toggle { display: flex; }

  .site-header.is-open .nav {
    display: flex;
    position: fixed;
    top: var(--header-h);
    left: 0; right: 0;
    flex-direction: column;
    align-items: stretch;
    gap: 0;
    padding: 8px var(--gutter) 24px;
    background: var(--paper-raised);
    border-bottom: 1px solid var(--line);
  }
  .site-header.is-open .nav a {
    padding: 15px 0;
    font-size: 17px;
    border-bottom: 1px solid var(--line-soft);
  }
  .site-header.is-open .nav a::after { display: none; }

  .hero-grid { grid-template-columns: 1fr; }
  .flywheel { max-width: 300px; margin-top: 40px; }

  .grid-3, .grid-2, .feature-3 { grid-template-columns: 1fr; }
  .card, .grid-3 .card:nth-child(3n) { border-right: 0; }
  .feature {
    padding: 28px 0;
    border-right: 0;
    border-bottom: 1px solid var(--line);
  }
  .feature + .feature { padding-left: 0; }
  .feature:last-child { border-bottom: 0; }

  .two-col, .two-col--read, .founder { grid-template-columns: 1fr; }

  .case-row {
    grid-template-columns: 1fr;
    gap: 12px;
  }
  .case-row__arrow { display: none; }

  .section-head { flex-direction: column; align-items: flex-start; gap: 18px; }

  .closing-band__row, .blue-band__row { flex-direction: column; align-items: flex-start; }

  .footer-top { grid-template-columns: 1fr 1fr; }

  .line-item { grid-template-columns: 40px minmax(0, 1fr); }
  .line-item__go { display: none; }
}

@media (max-width: 560px) {
  .hero-actions .btn { width: 100%; justify-content: center; }
  .hero-meta { gap: 20px; }
  .footer-top { grid-template-columns: 1fr; gap: 28px; }
}