/* ============================================================
   FDE 落地页专属样式
   规则：所有类名以 fde- 开头，所有规则只作用于 .fde-main 内部。
   不写 reset、不碰 body/标签选择器，与官网全局样式零冲突。
   配色：白 / #f5f5f5 / 强调红 #e11813
   ============================================================ */

.fde-main {
  font-family: "Microsoft YaHei", "PingFang SC", "Helvetica Neue", Arial, sans-serif;
  color: #333;
  background: #fff;
  line-height: 1.8;
  overflow: hidden;
}

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

.fde-main img {
  max-width: 100%;
  display: block;
}

/* ---------- 通用版块结构 ---------- */

.fde-section {
  padding: 80px 20px;
}

.fde-section--gray {
  background: #f5f5f5;
}

.fde-wrap {
  max-width: 1200px;
  margin: 0 auto;
}

.fde-kicker {
  font-size: 14px;
  letter-spacing: 4px;
  color: #e11813;
  text-align: center;
  margin: 0 0 12px;
  font-weight: 600;
}

.fde-h2 {
  font-size: 34px;
  font-weight: 700;
  color: #222;
  text-align: center;
  margin: 0 0 16px;
  line-height: 1.4;
}

.fde-lead {
  font-size: 16px;
  color: #666;
  text-align: center;
  max-width: 760px;
  margin: 0 auto 48px;
}

/* ---------- 首屏（深色 banner，底图与 AI 页同源） ---------- */

.fde-hero {
  position: relative;
  background: #101216 url(/images/2026s/ai-new/img-banner.jpg) no-repeat center bottom;
  background-size: cover;
  padding: 100px 20px 70px;
}

.fde-hero::before {
  /* 深色遮罩，保证文字可读性 */
  content: "";
  position: absolute;
  top: 0;
  right: 0;
  bottom: 0;
  left: 0;
  background: linear-gradient(180deg, rgba(12, 14, 18, .72) 0%, rgba(12, 14, 18, .55) 60%, rgba(12, 14, 18, .78) 100%);
}

.fde-hero-inner {
  position: relative;
  z-index: 1;
  max-width: 1000px;
  margin: 0 auto;
  text-align: center;
}

.fde-hero-tag {
  display: inline-block;
  font-size: 14px;
  color: #fff;
  border: 1px solid rgba(255, 255, 255, .5);
  border-radius: 20px;
  padding: 4px 18px;
  margin-bottom: 26px;
  letter-spacing: 1px;
}

.fde-hero h1 {
  font-size: 44px;
  font-weight: 700;
  color: #fff;
  line-height: 1.4;
  margin: 0 0 24px;
}

.fde-hero h1 em {
  font-style: normal;
  color: #ff5a52;
}

.fde-hero-sub {
  font-size: 17px;
  color: rgba(255, 255, 255, .85);
  max-width: 880px;
  margin: 0 auto 40px auto;
}

.fde-hero-note {
  font-size: 14px;
  color: rgba(255, 255, 255, .55);
  margin: 0 auto 40px;
}

.fde-hero-note strong {
  color: rgba(255, 255, 255, .8);
}

/* 首屏按钮 */

.fde-btn-row {
  margin-bottom: 60px;
}

.fde-btn {
  display: inline-block;
  min-width: 190px;
  padding: 14px 34px;
  font-size: 16px;
  border-radius: 4px;
  cursor: pointer;
  text-decoration: none;
  text-align: center;
  transition: all .2s;
  border: 1px solid #e11813;
  margin: 0 10px 10px;
}

.fde-btn--primary {
  background: #e11813;
  color: #fff;
}

.fde-btn--primary:hover {
  background: #c01410;
  color: #fff;
  text-decoration: none;
}

.fde-btn--ghost {
  background: transparent;
  border-color: rgba(255, 255, 255, .7);
  color: #fff;
}

.fde-btn--ghost:hover {
  background: rgba(255, 255, 255, .12);
  color: #fff;
  text-decoration: none;
}

/* 首屏信任数字 */

.fde-hero-stats {
  display: flex;
  justify-content: center;
  flex-wrap: wrap;
  border-top: 1px solid rgba(255, 255, 255, .2);
  padding-top: 40px;
}

.fde-hero-stats li {
  list-style: none;
  padding: 0 44px;
  text-align: center;
}

.fde-hero-stats .fde-stat-num {
  font-size: 38px;
  font-weight: 700;
  color: #fff;
}

.fde-hero-stats .fde-stat-num span {
  color: #ff5a52;
  font-size: 22px;
}

.fde-hero-stats .fde-stat-label {
  font-size: 14px;
  color: rgba(255, 255, 255, .6);
}

/* ---------- 三特征卡片 ---------- */

.fde-traits {
  display: flex;
  gap: 24px;
  flex-wrap: wrap;
}

.fde-trait {
  flex: 1 1 300px;
  background: #fff;
  padding: 44px 34px;
  border-top: 3px solid #e11813;
  box-shadow: 0 2px 12px rgba(0, 0, 0, .05);
}

.fde-trait h4 {
  font-size: 20px;
  font-weight: 700;
  color: #222;
  margin: 0 0 14px;
}

.fde-trait .fde-trait-num {
  font-size: 15px;
  color: #e11813;
  font-weight: 700;
  letter-spacing: 2px;
  display: block;
  margin-bottom: 18px;
}

.fde-trait p {
  font-size: 15px;
  color: #666;
  margin: 0;
}

/* ---------- 我们怎么做（时间线） ---------- */

.fde-how {
  display: flex;
  gap: 24px;
  flex-wrap: wrap;
  counter-reset: fde-step;
}

.fde-how-step {
  flex: 1 1 280px;
  background: #fff;
  box-shadow: 0 2px 12px rgba(0, 0, 0, .05);
  padding: 40px 30px;
  position: relative;
}

.fde-how-step::before {
  counter-increment: fde-step;
  content: counter(fde-step);
  display: block;
  font-size: 40px;
  font-weight: 700;
  color: #e11813;
  line-height: 1;
  margin-bottom: 18px;
}

.fde-how-step h4 {
  font-size: 18px;
  font-weight: 700;
  color: #222;
  margin: 0 0 12px;
}

.fde-how-step p {
  font-size: 14px;
  color: #666;
  margin: 0;
}

.fde-how-quote {
  margin: 48px auto 0;
  max-width: 820px;
  border-left: 4px solid #e11813;
  background: #fff;
  padding: 24px 32px;
  font-size: 16px;
  color: #444;
}

/* ---------- 点的活 vs 链路的活 ---------- */

.fde-vs {
  display: flex;
  gap: 24px;
  flex-wrap: wrap;
}

.fde-vs-col {
  flex: 1 1 380px;
  background: #f5f5f5;
  padding: 40px 36px;
}

.fde-vs-col h4 {
  font-size: 19px;
  font-weight: 700;
  color: #222;
  margin: 0 0 18px;
}

.fde-vs-col ul {
  margin: 0 0 18px;
  padding: 0;
  list-style: none;
}

.fde-vs-col ul li {
  font-size: 15px;
  color: #666;
  padding: 6px 0 6px 20px;
  position: relative;
}

.fde-vs-col ul li::before {
  content: "";
  position: absolute;
  left: 0;
  top: 15px;
  width: 8px;
  height: 2px;
  background: #e11813;
}

.fde-vs-result {
  font-size: 14px;
  color: #888;
  margin: 0;
  border-top: 1px solid #e3e3e3;
  padding-top: 14px;
}

/* ---------- 案例 ---------- */

.fde-cases {
  display: flex;
  gap: 30px;
  flex-wrap: wrap;
}

.fde-case {
  flex: 1 1 460px;
  background: #fff;
  border: 1px solid #eee;
  box-shadow: 0 2px 12px rgba(0, 0, 0, .05);
}

.fde-case-body {
  padding: 30px 32px 36px;
}

.fde-case-meta {
  font-size: 13px;
  color: #999;
  margin-bottom: 10px;
}

.fde-case h4 {
  font-size: 20px;
  font-weight: 700;
  color: #222;
  margin: 0 0 16px;
}

.fde-case p {
  font-size: 14px;
  color: #666;
  margin: 0 0 12px;
}

.fde-case-quote {
  border-top: 1px solid #eee;
  padding-top: 14px;
  font-size: 14px;
  color: #888;
  font-style: italic;
}

.fde-case-result {
  color: #e11813;
  font-weight: 600;
}

/* ---------- 诊断（POC）版块 ---------- */

.fde-poc-box {
  max-width: 960px;
  margin: 0 auto;
  background: #fff;
  box-shadow: 0 4px 24px rgba(0, 0, 0, .07);
  padding: 56px 50px;
}

.fde-poc-cols {
  display: flex;
  gap: 0;
  flex-wrap: wrap;
  margin: 36px 0;
  border-top: 1px solid #eee;
  border-bottom: 1px solid #eee;
}

.fde-poc-col {
  flex: 1 1 220px;
  padding: 28px 24px;
  text-align: center;
}

.fde-poc-col + .fde-poc-col {
  border-left: 1px solid #eee;
}

.fde-poc-col .fde-poc-key {
  font-size: 26px;
  font-weight: 700;
  color: #e11813;
  display: block;
  margin-bottom: 6px;
}

.fde-poc-col .fde-poc-label {
  font-size: 14px;
  color: #888;
}

.fde-poc-deliver {
  font-size: 15px;
  color: #555;
  margin: 0 0 8px;
}

.fde-poc-deliver strong {
  color: #222;
}

.fde-poc-cta {
  text-align: center;
  margin-top: 36px;
}

/* ---------- 常见问题 ---------- */

.fde-faq {
  max-width: 860px;
  margin: 0 auto;
}

.fde-faq-item {
  background: #fff;
  padding: 28px 34px;
  margin-bottom: 16px;
  box-shadow: 0 2px 8px rgba(0, 0, 0, .04);
}

.fde-faq-item h4 {
  font-size: 17px;
  font-weight: 700;
  color: #222;
  margin: 0 0 10px;
}

.fde-faq-item h4::before {
  content: "Q";
  color: #e11813;
  font-weight: 700;
  margin-right: 10px;
}

.fde-faq-item p {
  font-size: 15px;
  color: #666;
  margin: 0;
}

/* ---------- 底部 CTA 条 ---------- */

.fde-cta-bar {
  background: #222;
  padding: 56px 20px;
}

.fde-cta-bar-inner {
  max-width: 1000px;
  margin: 0 auto;
  display: flex;
  align-items: center;
  justify-content: space-between;
  flex-wrap: wrap;
  gap: 24px;
}

.fde-cta-bar h3 {
  font-size: 26px;
  color: #fff;
  margin: 0 0 8px;
  font-weight: 700;
}

.fde-cta-bar p {
  font-size: 15px;
  color: #aaa;
  margin: 0;
}

/* ---------- 响应式 ---------- */

@media (max-width: 768px) {
  .fde-section {
    padding: 50px 16px;
  }

  .fde-hero {
    padding: 60px 16px 40px;
  }

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

  .fde-h2 {
    font-size: 24px;
  }

  .fde-hero-stats li {
    padding: 0 18px 20px;
  }

  .fde-hero-stats .fde-stat-num {
    font-size: 28px;
  }

  .fde-poc-box {
    padding: 36px 22px;
  }

  .fde-poc-col + .fde-poc-col {
    border-left: none;
    border-top: 1px solid #eee;
  }

  .fde-cta-bar-inner {
    justify-content: center;
    text-align: center;
  }
}