/* ==========================================================================
   开放智能 · AI 能力板块
   在原站 Astra + Elementor 视觉语言之上扩展，令牌全部取自 post-1292 的既有取值。
   形状规则（全站统一）：
     - 图片、视觉主体 → 40px 0 40px 0 非对称圆角（沿用「愿景和使命」配图）
     - 面板、说明块   → 直角 + 1px 细线
   ========================================================================== */

:root {
  --oac-navy: #000b41;
  --oac-slate: #464f7a;
  --oac-red: #ff5050;
  --oac-pink: #fff4f4;
  --oac-line: rgba(70, 79, 122, 0.16);
  --oac-line-light: rgba(255, 255, 255, 0.18);

  --oac-display: "Open Sans", "PingFang SC", "Hiragino Sans GB",
    "Microsoft YaHei", "Noto Sans SC", sans-serif;
  --oac-body: "Karla", "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei",
    "Noto Sans SC", sans-serif;

  --oac-shell: 1150px;
  --oac-radius: 40px 0 40px 0;
  --oac-ease: cubic-bezier(0.16, 1, 0.3, 1);
}

/* --------------------------------------------------------------------------
   顶栏导航：静态首页只有一页，隐藏「首页 / 区域代理」与移动端汉堡菜单
   -------------------------------------------------------------------------- */

.ast-builder-menu-1,
.ast-builder-menu-mobile,
.ast-button-wrap,
.ast-mobile-header-content {
  display: none !important;
}

.oac-block {
  font-family: var(--oac-body);
  color: var(--oac-slate);
}

.oac-shell {
  width: 100%;
  max-width: var(--oac-shell);
  margin-inline: auto;
  padding-inline: 24px;
}

/* 共用排版 -------------------------------------------------------------- */

/* 主题的 .entry-content h1-h6 规则特异度为 0,1,1，这里统一加 .oac-block 前缀压过它，
   否则深色区块里的白色标题会被主题的深蓝色覆盖。
   中文没有可靠的 ch 宽度参照，所有容器宽度一律用 px。 */
.oac-block .oac-h2 {
  font-family: var(--oac-display);
  font-size: clamp(26px, 3.4vw, 42px);
  font-weight: 900;
  line-height: 1.3;
  color: var(--oac-navy);
  margin: 0 0 20px;
  letter-spacing: -0.01em;
}

.oac-lead {
  font-family: var(--oac-body);
  font-size: 17px;
  font-weight: 300;
  line-height: 1.8;
  color: var(--oac-slate);
  margin: 0;
  max-width: 680px;
}

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

/* --------------------------------------------------------------------------
   1. 认知横幅：整幅深色图 + 海军蓝罩色，呼应首屏的照片式 Hero
   -------------------------------------------------------------------------- */

.oac-thesis {
  position: relative;
  isolation: isolate;
  background-image: url("../img/oac-thesis-band.jpg");
  background-size: cover;
  background-position: center right;
  padding: clamp(72px, 9vw, 120px) 0;
  overflow: hidden;
}

.oac-thesis::before {
  content: "";
  position: absolute;
  inset: 0;
  z-index: -1;
  background: linear-gradient(
    100deg,
    rgba(0, 11, 65, 0.95) 0%,
    rgba(0, 11, 65, 0.91) 46%,
    rgba(0, 11, 65, 0.78) 100%
  );
}

.oac-thesis__head {
  max-width: 780px;
}

.oac-block .oac-thesis .oac-h2,
.oac-thesis .oac-h2 {
  color: #fff;
}

.oac-thesis .oac-lead {
  color: rgba(255, 255, 255, 0.84);
}

.oac-engines {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 0;
  margin-top: clamp(40px, 5vw, 64px);
  border-top: 1px solid var(--oac-line-light);
}

.oac-engine {
  padding: 32px 32px 0 0;
  border-right: 1px solid var(--oac-line-light);
}

.oac-engine:last-child {
  border-right: 0;
}

.oac-engine + .oac-engine {
  padding-left: 32px;
}

.oac-block .oac-engine__name {
  font-family: var(--oac-display);
  font-size: 22px;
  font-weight: 900;
  color: #fff;
  margin: 0 0 10px;
}

.oac-engine__name::before {
  content: "";
  display: block;
  width: 34px;
  height: 3px;
  background: var(--oac-red);
  margin-bottom: 16px;
}

.oac-engine__desc {
  font-size: 15px;
  font-weight: 300;
  line-height: 1.75;
  color: rgba(255, 255, 255, 0.8);
  margin: 0;
}

/* --------------------------------------------------------------------------
   2 & 3. 图文分栏：沿用原站「图片 + 右侧要点」的节奏，两节左右互换
   -------------------------------------------------------------------------- */

.oac-split {
  padding: clamp(64px, 8vw, 104px) 0;
  background: #fff;
}

.oac-split--tinted {
  background: var(--oac-pink);
}

.oac-split__grid {
  display: grid;
  grid-template-columns: 1.05fr 1fr;
  gap: clamp(36px, 5vw, 72px);
  align-items: center;
}

/* order 会把图片挪到第二格，所以翻转时把较宽的一列也换到右边 */
.oac-split--flip .oac-split__grid {
  grid-template-columns: 1fr 1.05fr;
}

.oac-split--flip .oac-split__media {
  order: 2;
}

.oac-split__media img {
  border-radius: var(--oac-radius);
}

.oac-split__body .oac-lead {
  margin-bottom: 28px;
}

/* 要点清单：复用原站红色对勾的语气，但用细线分组而非卡片 */
.oac-points {
  list-style: none;
  margin: 0;
  padding: 0;
  border-top: 1px solid var(--oac-line);
}

.oac-points li {
  padding: 16px 0 16px 30px;
  border-bottom: 1px solid var(--oac-line);
  position: relative;
  font-size: 15px;
  font-weight: 300;
  line-height: 1.7;
}

.oac-points li::before {
  content: "";
  position: absolute;
  left: 0;
  top: 25px;
  width: 12px;
  height: 7px;
  border-left: 2px solid var(--oac-red);
  border-bottom: 2px solid var(--oac-red);
  transform: rotate(-45deg);
}

.oac-points b {
  font-family: var(--oac-display);
  font-weight: 700;
  color: var(--oac-navy);
}

/* 承接四段：分栏之下的整幅节奏条 */
.oac-relay {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 0;
  margin-top: clamp(44px, 5vw, 68px);
  border-top: 2px solid var(--oac-navy);
}

.oac-relay__item {
  padding: 26px 26px 0 0;
  border-right: 1px solid var(--oac-line);
}

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

.oac-relay__item + .oac-relay__item {
  padding-left: 26px;
}

.oac-block .oac-relay__term {
  font-family: var(--oac-display);
  font-size: 19px;
  font-weight: 900;
  color: var(--oac-navy);
  margin: 0 0 8px;
}

.oac-relay__desc {
  font-size: 14px;
  font-weight: 300;
  line-height: 1.7;
  margin: 0;
}

/* --------------------------------------------------------------------------
   4. 双格 bento：打断左右分栏的节奏，两格都带真实图片
   -------------------------------------------------------------------------- */

.oac-bento {
  padding: clamp(64px, 8vw, 104px) 0;
  background: #fff;
}

.oac-bento__head {
  max-width: 780px;
  margin-bottom: clamp(36px, 4vw, 56px);
}

.oac-bento__grid {
  display: grid;
  grid-template-columns: 1.15fr 1fr;
  gap: 32px;
}

.oac-tile {
  display: flex;
  flex-direction: column;
  background: #fff;
  border: 1px solid var(--oac-line);
  overflow: hidden;
  transition: border-color 0.4s var(--oac-ease), transform 0.4s var(--oac-ease);
}

.oac-tile:hover {
  border-color: rgba(255, 80, 80, 0.5);
  transform: translateY(-3px);
}

/* 固定高度而非 aspect-ratio：两格宽度不等，按比例算会让图片底边错开，
   下面的小标题也就对不齐。 */
.oac-tile__media {
  height: 268px;
  overflow: hidden;
}

.oac-tile__media img {
  height: 100%;
  object-fit: cover;
}

.oac-tile__body {
  padding: 28px 30px 30px;
  display: flex;
  flex-direction: column;
  flex: 1;
}

.oac-tile__kicker {
  font-family: var(--oac-display);
  font-size: 13px;
  font-weight: 700;
  color: var(--oac-red);
  margin: 0 0 8px;
}

.oac-block .oac-tile__title {
  font-family: var(--oac-display);
  font-size: clamp(20px, 2.2vw, 26px);
  font-weight: 900;
  line-height: 1.35;
  color: var(--oac-navy);
  margin: 0 0 14px;
}

.oac-tile__desc {
  font-size: 15px;
  font-weight: 300;
  line-height: 1.75;
  margin: 0 0 20px;
}

.oac-tile .oac-points {
  margin-top: auto;
}

.oac-tile .oac-points li {
  padding-block: 13px;
  font-size: 14px;
}

.oac-tile .oac-points li:last-child {
  border-bottom: 0;
  padding-bottom: 0;
}

.oac-tile .oac-points li::before {
  top: 22px;
}

/* --------------------------------------------------------------------------
   5. 产融与规模：淡粉底 + 数据条，沿用原站 #FFF4F4 区块底色
   -------------------------------------------------------------------------- */

.oac-scale {
  padding: clamp(64px, 8vw, 100px) 0;
  background: var(--oac-pink);
}

.oac-scale__head {
  max-width: 760px;
  margin-bottom: clamp(36px, 4vw, 52px);
}

.oac-chunks {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 28px;
  margin-bottom: clamp(44px, 5vw, 64px);
}

.oac-block .oac-chunk__title {
  font-family: var(--oac-display);
  font-size: 17px;
  font-weight: 900;
  color: var(--oac-navy);
  margin: 0 0 10px;
  padding-top: 16px;
  border-top: 2px solid var(--oac-red);
}

.oac-chunk__desc {
  font-size: 14px;
  font-weight: 300;
  line-height: 1.75;
  margin: 0;
}

.oac-stats {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 0;
  border-top: 1px solid var(--oac-line);
  padding-top: 32px;
}

.oac-stat {
  padding-right: 24px;
  border-right: 1px solid var(--oac-line);
}

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

.oac-stat + .oac-stat {
  padding-left: 24px;
}

.oac-stat__num {
  display: block;
  font-family: var(--oac-display);
  font-size: clamp(34px, 4.4vw, 52px);
  font-weight: 900;
  line-height: 1;
  color: var(--oac-navy);
  letter-spacing: -0.02em;
}

.oac-stat__label {
  display: block;
  margin-top: 10px;
  font-size: 14px;
  font-weight: 300;
  line-height: 1.6;
  color: var(--oac-slate);
}

.oac-scale__note {
  margin: 28px 0 0;
  font-size: 13px;
  font-weight: 300;
  line-height: 1.7;
  color: rgba(70, 79, 122, 0.72);
}

/* --------------------------------------------------------------------------
   进场动效：MOTION 低档，只做一次轻量位移淡入，用于建立阅读顺序
   -------------------------------------------------------------------------- */

@media (prefers-reduced-motion: no-preference) {
  .oac-reveal {
    opacity: 0;
    transform: translateY(22px);
    transition: opacity 0.7s var(--oac-ease), transform 0.7s var(--oac-ease);
  }

  .oac-reveal.is-visible {
    opacity: 1;
    transform: none;
  }
}

/* --------------------------------------------------------------------------
   响应式：1024 起收窄，768 以下全部单列
   -------------------------------------------------------------------------- */

@media (max-width: 1024px) {
  /* .oac-split--flip .oac-split__grid 的特异度更高，必须一起覆盖，
     否则翻转的那一节在手机上会保持双栏。 */
  .oac-split__grid,
  .oac-split--flip .oac-split__grid,
  .oac-bento__grid {
    grid-template-columns: 1fr;
  }

  .oac-split--flip .oac-split__media {
    order: 0;
  }

  .oac-split__media img {
    max-width: 620px;
  }

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

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

  .oac-relay__item:nth-child(n + 3) {
    margin-top: 26px;
    padding-top: 26px;
    border-top: 1px solid var(--oac-line);
  }

  .oac-chunks {
    grid-template-columns: 1fr;
    gap: 22px;
  }
}

@media (max-width: 767px) {
  .oac-shell {
    padding-inline: 20px;
  }

  .oac-thesis {
    background-position: center;
  }

  .oac-thesis::before {
    background: rgba(0, 11, 65, 0.92);
  }

  .oac-engines,
  .oac-relay,
  .oac-stats {
    grid-template-columns: 1fr;
  }

  .oac-engine,
  .oac-relay__item,
  .oac-stat {
    border-right: 0;
    padding: 24px 0 0;
  }

  .oac-engine + .oac-engine,
  .oac-relay__item + .oac-relay__item,
  .oac-stat + .oac-stat {
    padding-left: 0;
    margin-top: 24px;
    border-top: 1px solid var(--oac-line);
  }

  .oac-engine + .oac-engine {
    border-top-color: var(--oac-line-light);
  }

  .oac-relay__item:nth-child(n + 3) {
    margin-top: 24px;
    padding-top: 24px;
  }

  .oac-stat__num {
    font-size: 40px;
  }

  .oac-tile__body {
    padding: 24px 22px 26px;
  }
}