/* ==========================================================================
   custom.css —— 首页 index.html 专属样式（从原内联 <style> 抽离）
   作用：对 Bootstrap / style.css 的首页级定制覆盖
   ========================================================================== */

/* 导航栏作文评改智能体主按钮优化 */
.composition-trigger {
  position: relative;
  padding: 10px 20px !important;
  border-radius: 8px;
  transition: all 0.25s ease-in-out;
  background: linear-gradient(
    135deg,
    rgba(255, 159, 67, 0.08) 0%,
    rgba(255, 111, 0, 0.05) 100%
  );
  font-weight: 500;
  letter-spacing: 0.3px;
}
.composition-trigger::after {
  content: "";
  position: absolute;
  bottom: 0;
  left: 50%;
  transform: translateX(-50%);
  width: 0;
  height: 3px;
  background-color: #ff7d00;
  border-radius: 3px;
  transition: width 0.3s ease;
}
.composition-trigger:hover {
  background: linear-gradient(
    135deg,
    rgba(255, 159, 67, 0.15) 0%,
    rgba(255, 111, 0, 0.1) 100%
  ) !important;
  color: #ff7d00 !important;
  text-shadow: 0 0 6px rgba(255, 159, 67, 0.2);
  transform: translateY(-1px);
}
.composition-trigger:hover::after {
  width: 70%;
}

/* 下拉菜单优化 */
.composition-dropdown {
  border: 1px solid rgba(255, 159, 67, 0.2) !important;
  border-radius: 8px !important;
  box-shadow: 0 3px 12px rgba(0, 0, 0, 0.08) !important;
  padding: 6px 0 !important;
  margin-top: 8px !important;
  background-color: #fff !important;
  overflow: hidden;
}
.composition-dropdown .dropdown-item {
  padding: 10px 24px !important;
  margin: 1px 0 !important;
  border-radius: 0 !important;
  transition: all 0.2s ease;
  position: relative;
}
.composition-dropdown .dropdown-item::before {
  content: "•";
  position: absolute;
  left: 12px;
  color: #ff9f43;
  font-size: 18px;
  opacity: 0;
  transition:
    opacity 0.2s ease,
    transform 0.2s ease;
  transform: translateX(-5px);
}
.composition-dropdown .dropdown-item:hover {
  background: #fff8f0 !important;
  color: #ff7d00 !important;
  font-weight: 500;
  padding-left: 28px !important;
}
.composition-dropdown .dropdown-item:hover::before {
  opacity: 1;
  transform: translateX(0);
}

/* 1A. 顶部身份横幅样式 */
.page .top-banner {
  background: linear-gradient(90deg, #165dff, #3498db);
  color: #fff;
  padding: 8px 0;
  position: sticky;
  top: 0;
  z-index: 999;
  box-shadow: 0 2px 8px rgba(0, 0, 0, 0.1);
}
.top-banner .container {
  display: flex;
  justify-content: center;
  align-items: center;
  flex-wrap: wrap;
}
.top-banner .banner-text {
  margin: 0;
  font-size: 14px;
  letter-spacing: 0.5px;
  font-weight: 300;
  line-height: 1.5;
  text-align: center;
}

/* 2A.1. 导航栏毛玻璃效果改造 */
.rd-navbar-main-outer {
  background: rgba(52, 152, 219, 0.8);
  backdrop-filter: blur(10px);
  -webkit-backdrop-filter: blur(10px);
  position: sticky;
  top: 40px;
  z-index: 998;
  border-bottom: 1px solid rgba(255, 255, 255, 0.2);
}

/* 2A.2. 下拉菜单弹性缓冲动画 ????*/
.dropdown .composition-dropdown {
  animation: dropdown-spring 0.4s cubic-bezier(0.175, 0.885, 0.32, 1.275)
    forwards;
  opacity: 0;
  transform: translateY(10px) scale(0.98);
}
@keyframes dropdown-spring {
  0% {
    opacity: 0;
    transform: translateY(10px) scale(0.98);
  }
  100% {
    opacity: 1;
    transform: translateY(0) scale(1);
  }
}
.dropdown.show .composition-dropdown {
  display: block;
}

/* 3B.1. 轮播图浅色渐变遮罩 - 确保文字清晰可见（降低遮罩强度）*/
.swiper-slide {
  position: relative;
}
.swiper-slide::before {
  content: "";
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  background: linear-gradient(
    135deg,
    rgba(0, 0, 0, 0.3) 0%,
    rgba(0, 0, 0, 0.2) 50%,
    rgba(0, 0, 0, 0.15) 100%
  );
  z-index: 1;
  pointer-events: none;
}
.swiper-slide .swiper-slide-caption {
  position: relative;
  z-index: 2;
}
.swiper-slide .container {
  position: relative;
  z-index: 3;
}

/* 3B.2. 轮播图文字增加黑色描边效果，确保在任何背景下都清晰 */
.swiper-slide h1 {
  text-shadow:
    2px 2px 8px rgba(0, 0, 0, 0.5),
    0 0 20px rgba(0, 0, 0, 0.3);
  letter-spacing: -0.3px;
  color: #ffffff;
}
.swiper-slide p {
  text-shadow: 1px 1px 6px rgba(0, 0, 0, 0.5);
  color: rgba(255, 255, 255, 0.95);
  font-weight: 500;
}

/* 3B.3. 按钮发光阴影增强 */
.button-primary {
  box-shadow: 0 6px 20px rgba(52, 152, 219, 0.5);
  transition:
    box-shadow 0.25s ease,
    transform 0.2s ease;
  background: linear-gradient(135deg, #3498db, #2980b9);
  border: none;
}
.button-primary:hover {
  box-shadow:
    0 12px 35px rgba(52, 152, 219, 0.8),
    0 0 20px rgba(52, 152, 219, 0.5);
  transform: translateY(-2px);
  background: linear-gradient(135deg, #3ea0e0, #2c6e9e);
}

/* 4A. 覆盖所有功能块（含颜色类）的 hover 背景，强制与静态一致 */
.context-dark .blurb-boxed-2:hover,
.context-dark .blurb-boxed-2.blurb-boxed-green:hover,
.context-dark .blurb-boxed-2.blurb-boxed-orange:hover,
.context-dark .blurb-boxed-2.blurb-boxed-red:hover,
.context-dark .blurb-boxed-2.active,
.context-dark .blurb-boxed-2.hovered {
  background: inherit;
  background-color: inherit;
  background-image: inherit;
  border: inherit;
  border-color: inherit;
  box-shadow: inherit;
  filter: none;
  outline: none;
  transition: all 0.4s cubic-bezier(0.175, 0.885, 0.32, 1.275);
}
/*hover 悬浮上移 */
.context-dark .blurb-boxed-2:hover {
  transform: translateY(-2px);
}
/* 图标 hover 平滑放大 */
.context-dark .blurb-boxed-2 .icon {
  transition: transform 0.4s cubic-bezier(0.175, 0.885, 0.32, 1.275);
}
.context-dark .blurb-boxed-2:hover .icon {
  transform: scale(1.2);
}
/* 白色流光扫过效果 */
.context-dark .blurb-boxed-2 {
  position: relative;
  overflow: hidden;
}
.context-dark .blurb-boxed-2::after {
  content: "";
  position: absolute;
  top: 0;
  left: -100%;
  width: 100%;
  height: 100%;
  background: linear-gradient(
    90deg,
    transparent,
    rgba(255, 255, 255, 0.3),
    transparent
  );
  transition: left 0.6s ease;
  z-index: 1;
  pointer-events: none;
}
.context-dark .blurb-boxed-2:hover::after {
  left: 100%;
}

/* 5B. 教学对象板块样式 */
.target-audience {
  padding: 80px 0;
  background: #ffffff;
}
.section-header h2 {
  color: #1a5276;
  font-weight: 800;
  margin-bottom: 0.8rem;
  font-size: 2.2rem;
  position: relative;
  display: inline-block;
  padding-bottom: 12px;
}
.section-header h2:after {
  content: "";
  position: absolute;
  bottom: 0;
  left: 50%;
  transform: translateX(-50%);
  width: 60px;
  height: 3px;
  background: linear-gradient(90deg, #3498db, #1a5276);
  border-radius: 3px;
}
.section-subhead {
  color: #5d6d7e;
  max-width: 750px;
  margin: 20px auto 50px;
  font-size: 1rem;
  line-height: 1.7;
}
.audience-card {
  background: #ffffff;
  border-radius: 28px;
  padding: 2rem 1.8rem;
  text-align: center;
  border: 1px solid rgba(52, 152, 219, 0.18);
  transition: all 0.4s cubic-bezier(0.2, 0.9, 0.4, 1.1);
  height: 100%;
  box-shadow: 0 12px 28px rgba(0, 0, 0, 0.04);
}
.audience-card:hover {
  transform: translateY(-8px);
  border-color: rgba(52, 152, 219, 0.45);
  box-shadow: 0 24px 40px rgba(52, 152, 219, 0.12);
}
.audience-icon {
  width: 88px;
  height: 88px;
  margin: 0 auto 20px;
  display: flex;
  align-items: center;
  justify-content: center;
  background: linear-gradient(145deg, #f0f7ff, #ffffff);
  border-radius: 50%;
  box-shadow: 0 12px 24px rgba(52, 152, 219, 0.1);
  transition: transform 0.3s ease;
}
.audience-card:hover .audience-icon {
  transform: scale(1.02);
}
.audience-icon svg {
  width: 52px;
  height: 52px;
  stroke-width: 1.6;
  stroke: #2c7cb6;
  fill: none;
}
.audience-card h5 {
  font-weight: 700;
  color: #1a5276;
  margin-bottom: 16px;
  font-size: 1.45rem;
}
.audience-card p {
  color: #4a5b6e;
  font-size: 0.95rem;
  line-height: 1.65;
  margin-bottom: 0;
}

/* ---C- */
/* ▸ 动画 */
@keyframes c-dash {
  from {
    background-position: 0 0;
  }
  to {
    background-position: 40px 0;
  }
}
@keyframes c-glow {
  0%,
  100% {
    box-shadow: 0 0 0 0 rgba(52, 152, 219, 0.28);
  }
  50% {
    box-shadow: 0 0 0 12px rgba(52, 152, 219, 0);
  }
}
@keyframes c-ball {
  0% {
    left: 6%;
    opacity: 0;
  }
  6% {
    opacity: 1;
  }
  94% {
    opacity: 1;
  }
  100% {
    left: 92%;
    opacity: 0;
  }
}
@keyframes c-arc {
  from {
    stroke-dashoffset: 0;
  }
  to {
    stroke-dashoffset: -22;
  }
}
/* 6C. 教学设计  */
.c-design {
  padding: 78px 0 58px;
  background: #f7f7f7;
}
/* 标题 — 与网站"平台服务"标题风格统一 */
.c-hd {
  text-align: center;
  margin-bottom: 48px;
}
.c-hd h2 {
  font-size: 36px;
  font-weight: 400;
  color: #333;
  margin-bottom: 18px;
}
.c-hd p {
  max-width: 660px;
  margin: 0 auto;
  font-size: 15px;
  color: #888;
  line-height: 1.85;
}
/* ▸ 卡片网格 — 用 flex 强制等高 */
.c-grid {
  display: flex;
  flex-wrap: wrap;
  margin: 0 -14px;
}
.c-grid > .c-col {
  flex: 0 0 50%;
  max-width: 50%;
  padding: 0 14px;
  margin-bottom: 28px;
  display: flex; /* 子元素撑满 */
}
/* ▸ 单张卡片 */
.c-card {
  display: flex;
  flex-direction: column;
  width: 100%;
  background: #fff;
  border-radius: 16px;
  overflow: hidden;
  transition: all 0.3s ease;
  box-shadow: 0 10px 30px rgba(0, 0, 0, 0.04);
}
.c-card:hover {
  transform: translateY(-4px);
  box-shadow: 0 20px 40px rgba(0, 0, 0, 0.08);
}
/* 顶栏：色条 + 图标 + 标题，一体式 */
.c-card-top {
  display: flex;
  align-items: center;
  padding: 22px 32px;
  position: relative;
  border-bottom: 1px dashed rgba(0, 0, 0, 0.05);
}
.c-card-top.c-t-blue {
  background: #ebf5ff;
  color: #2563eb;
}
.c-card-top.c-t-orange {
  background: #fff7ed;
  color: #ea580c;
}
.c-card-top.c-t-green {
  background: #f0fdf4;
  color: #16a34a;
}
.c-card-top.c-t-purple {
  background: #faf5ff;
  color: #9333ea;
}
.c-card-top svg {
  flex: 0 0 38px;
  width: 38px;
  height: 38px;
  margin-right: 16px;
  opacity: 0.92;
  stroke: currentColor;
}
.c-card-top h5 {
  margin: 0;
  font-size: 17px;
  font-weight: 600;
  letter-spacing: 0.3px;
}
/* 卡片正文 */
.c-card-bd {
  flex: 1; /* 占满剩余空间 → 实现等高 */
  padding: 32px 32px 28px;
}
.c-card-bd ul {
  padding-left: 18px;
  margin: 0;
}
.c-card-bd li {
  font-size: 14px;
  color: #555;
  line-height: 1.8;
  margin-bottom: 12px;
}
.c-card-bd li:last-child {
  margin-bottom: 0;
}
.c-card-bd li::marker {
  color: #ccc;
}
.c-card-bd li strong {
  color: #333;
  font-weight: 600;
}

/* 7C. 教学流程 */
.c-flow {
  padding: 78px 0 50px;
  background: #fff;
  overflow: hidden;
}
/* 轨道 */
.c-rail {
  position: relative;
  display: flex;
  justify-content: space-between;
  max-width: 960px;
  margin: 0 auto;
  padding: 0 30px;
}
/* 底线 */
.c-rail::before {
  content: "";
  position: absolute;
  top: 48px;
  left: 80px;
  right: 80px;
  height: 3px;
  background: #e4ecf4;
  z-index: 1;
}
/* 流动虚线 */
.c-rail::after {
  content: "";
  position: absolute;
  top: 48px;
  left: 80px;
  right: 80px;
  height: 3px;
  z-index: 2;
  background: repeating-linear-gradient(
    90deg,
    #3498db 0,
    #3498db 12px,
    transparent 12px,
    transparent 22px
  );
  background-size: 44px 3px;
  animation: c-dash 1.2s linear infinite;
}
/* 小球 */
.c-ball {
  position: absolute;
  top: 43px;
  left: 6%;
  width: 13px;
  height: 13px;
  border-radius: 50%;
  background: #3498db;
  box-shadow: 0 0 12px rgba(52, 152, 219, 0.45);
  z-index: 5;
  animation: c-ball 3.6s ease-in-out infinite;
  pointer-events: none;
}
/* 步骤节点 */
.c-node {
  flex: 0 0 200px;
  text-align: center;
  position: relative;
  z-index: 3;
}
.c-circle {
  width: 96px;
  height: 96px;
  border-radius: 50%;
  margin: 0 auto 18px;
  display: flex;
  align-items: center;
  justify-content: center;
  position: relative;
  transition: transform 0.3s ease;
}
.c-node:hover .c-circle {
  transform: scale(1.08);
}
/* 外圈脉冲 */
.c-circle::after {
  content: "";
  position: absolute;
  inset: -5px;
  border-radius: 50%;
  border: 2px solid transparent;
  transition: border-color 0.3s;
}
.c-node:hover .c-circle::after {
  border-color: rgba(52, 152, 219, 0.18);
  animation: c-glow 2s ease-in-out infinite;
}
.c-circle svg {
  width: 40px;
  height: 40px;
  fill: none;
  stroke: #fff;
  stroke-width: 2;
  stroke-linecap: round;
  stroke-linejoin: round;
}
.c-c1 {
  background: #3498db;
  box-shadow: 0 6px 20px rgba(52, 152, 219, 0.28);
}
.c-c2 {
  background: #e67e22;
  box-shadow: 0 6px 20px rgba(230, 126, 34, 0.28);
}
.c-c3 {
  background: #50b848;
  box-shadow: 0 6px 20px rgba(80, 184, 72, 0.28);
}
.c-c4 {
  background: #9b59b6;
  box-shadow: 0 6px 20px rgba(155, 89, 182, 0.28);
}
.c-phase {
  font-size: 12px;
  color: #aaa;
  letter-spacing: 0.4px;
  margin-bottom: 3px;
}
.c-name {
  font-size: 17px;
  font-weight: 700;
  color: #333;
  margin-bottom: 10px;
}
.c-desc {
  font-size: 13px;
  color: #777;
  line-height: 1.75;
  max-width: 185px;
  margin: 0 auto;
}
.c-desc strong {
  color: #333;
}
/* 闭环弧 */
.c-arc {
  max-width: 960px;
  margin: 0 auto;
  padding: 0 30px;
}
.c-arc svg {
  display: block;
  width: 100%;
  height: auto;
  overflow: visible;
}
.c-arc-line {
  fill: none;
  stroke: #3498db;
  stroke-width: 2;
  stroke-dasharray: 10 8;
  opacity: 0.25;
  animation: c-arc 1.5s linear infinite;
}
.c-arc-arr {
  fill: #3498db;
  opacity: 0.3;
}
.c-arc-label {
  text-align: center;
  margin-top: 10px;
  font-size: 13px;
  color: #aaa;
  letter-spacing: 1px;
}
.c-arc-label em {
  font-style: normal;
  display: inline-block;
  padding: 4px 22px;
  border: 1px dashed #d0dce8;
  border-radius: 20px;
  color: #3498db;
  font-weight: 500;
}
/* ▸ 响应式 */
@media (max-width: 991px) {
  .c-grid > .c-col {
    flex: 0 0 100%;
    max-width: 100%;
  }
  .c-rail {
    flex-wrap: wrap;
    justify-content: center;
  }
  .c-node {
    flex: 0 0 50%;
    margin-bottom: 32px;
  }
  .c-rail::before,
  .c-rail::after,
  .c-ball,
  .c-arc svg {
    display: none;
  }
}
@media (max-width: 575px) {
  .c-node {
    flex: 0 0 100%;
  }
  .c-design,
  .c-flow {
    padding: 50px 0 30px;
  }
  .c-hd h2 {
    font-size: 28px;
  }
  .c-card-top {
    padding: 18px 22px;
  }
  .c-card-bd {
    padding: 24px 22px 20px;
  }
}

/* 8D. AI技术映射板块 */
.ai-tech-mapping {
  background: #f9fbff; /* 契合整体的浅蓝灰学术风背景 */
  padding: 80px 0;
}
.ai-tech-mapping h2 {
  text-align: center;
  color: #1a5276; /* 与上方标题颜色统一 */
  font-weight: 700;
  margin-bottom: 12px;
}
.ai-tech-mapping .section-subtitle {
  text-align: center;
  color: #5d6d7e;
  max-width: 700px;
  margin: 0 auto 50px;
  font-size: 16px;
  line-height: 1.7;
}
.tech-card {
  background: #ffffff;
  border: 1px solid rgba(52, 152, 219, 0.12); /* 柔和的边框 */
  border-radius: 16px;
  padding: 32px 28px;
  margin-bottom: 24px;
  transition: all 0.3s ease;
  height: 100%;
  box-shadow: 0 8px 24px rgba(0, 0, 0, 0.03); /* 统一的软阴影 */
}
.tech-card:hover {
  transform: translateY(-6px);
  box-shadow: 0 16px 35px rgba(52, 152, 219, 0.08);
  border-color: rgba(52, 152, 219, 0.3);
}
.tech-label {
  display: inline-block;
  padding: 6px 14px;
  border-radius: 6px;
  font-size: 12px;
  font-weight: 700;
  letter-spacing: 0.5px;
  text-transform: uppercase;
  margin-bottom: 18px;
}
/* 采用与“教学设计”一致的浅色底+深色字标签风格 */
.tech-label.kg {
  background: #fff7ed;
  color: #ea580c;
}
.tech-label.nlp {
  background: #ebf5ff;
  color: #2563eb;
}
.tech-label.llm {
  background: #f0fdf4;
  color: #16a34a;
}
.tech-label.al {
  background: #faf5ff;
  color: #9333ea;
}

.tech-card h5 {
  font-size: 19px;
  font-weight: 700;
  color: #1a5276;
  margin-bottom: 12px;
}
.tech-card p {
  font-size: 14.5px;
  line-height: 1.75;
  color: #555;
  margin-bottom: 16px;
}
.arrow-text {
  font-size: 13.5px;
  color: #666;
  display: block;
  margin-top: 15px;
  padding-top: 16px;
  border-top: 1px dashed rgba(0, 0, 0, 0.08); /* 虚线分割，增加层次 */
}
.arrow-text strong {
  color: #3498db;
  font-weight: 600;
}

/* 10D. 教学反思（杂志级无边框水印 + 错落排版） */
.teaching-reflection {
  background: #ffffff; /* 使用干净的纯白背景，与上方的浅色/深色区域形成呼吸感对比 */
  padding: 90px 0;
  position: relative;
  overflow: hidden;
}
/* 底部微妙的光晕装饰，增加科技感 */
.teaching-reflection::after {
  content: "";
  position: absolute;
  bottom: -150px;
  right: -100px;
  width: 400px;
  height: 400px;
  background: radial-gradient(
    circle,
    rgba(52, 152, 219, 0.04) 0%,
    transparent 70%
  );
  border-radius: 50%;
  pointer-events: none;
}

/* 单个反思项容器 */
.ref-editorial-item {
  position: relative;
  padding: 25px 20px 25px 40px;
  margin-bottom: 25px;
  transition: all 0.4s cubic-bezier(0.2, 0.8, 0.2, 1);
  border-radius: 0;
}

/* 左侧动态指示线 */
.ref-editorial-item::before {
  content: "";
  position: absolute;
  left: 0;
  top: 25px;
  bottom: 25px;
  width: 3px;
  background: rgba(52, 152, 219, 0.15);
  transition: all 0.4s ease;
  border-radius: 3px;
}
/* 悬浮时，指示线伸长并变色，背景出现微弱渐变 */
.ref-editorial-item:hover::before {
  top: 10px;
  bottom: 10px;
  background: #3498db;
}
.ref-editorial-item:hover {
  background: linear-gradient(
    90deg,
    rgba(52, 152, 219, 0.03) 0%,
    transparent 100%
  );
}

/* 超大数字水印特效 */
.ref-watermark {
  position: absolute;
  top: 0;
  left: 15px;
  font-size: 80px;
  font-weight: 900;
  color: rgba(52, 152, 219, 0.15);
  line-height: 0.85;
  font-family: "Arial Black", Impact, sans-serif;
  z-index: 0;
  transition: all 0.5s cubic-bezier(0.2, 0.8, 0.2, 1);
  pointer-events: none;
}
/* 悬浮时水印数字放大偏移 */
.ref-editorial-item:hover .ref-watermark {
  color: rgba(52, 152, 219, 0.35);
  transform: translate(12px, -8px) scale(1.08);
}

/* 文字内容区 */
.ref-content {
  position: relative;
  z-index: 1;
}
.ref-content h6 {
  font-size: 19px;
  font-weight: 700;
  color: #1a5276;
  margin-bottom: 12px;
  letter-spacing: 0.5px;
  transition: color 0.3s ease;
}
.ref-editorial-item:hover .ref-content h6 {
  color: #3498db; /* 悬浮时标题变亮 */
}
.ref-content p {
  font-size: 14.5px;
  line-height: 1.8;
  color: #666;
  margin: 0;
}

/* 大屏下右侧列整体下沉，形成错落式瀑布流 */
@media (min-width: 768px) {
  .stagger-col-right {
    margin-top: 60px;
  }
}

/* ====================================================
   新增：精品教学课件展示区块 (Digital Courseware)
   放在教学功能矩阵与教学反思之间
==================================================== */
.courseware-section {
  background: #f4f7fa; /* 与上下白色区块形成视觉分隔 */
  padding: 90px 0;
}
.cw-card {
  background: #ffffff;
  border-radius: 24px;
  box-shadow: 0 15px 40px rgba(52, 152, 219, 0.08);
  display: flex;
  overflow: hidden;
  border: 1px solid rgba(52, 152, 219, 0.1);
  flex-wrap: wrap;
}
/* 左侧：课件内嵌预览 */
.cw-left {
  flex: 1 1 55%;
  background: #ebf0f5;
  padding: 25px;
  display: flex;
  align-items: center;
  justify-content: center;
}
.cw-iframe-wrapper {
  width: 100%;
  height: 450px;
  background: #fff;
  border-radius: 12px;
  overflow: hidden;
  box-shadow: 0 8px 25px rgba(0, 0, 0, 0.1);
  position: relative;
}
/* PDF iframe */
.cw-iframe-wrapper iframe {
  width: 100%;
  height: 100%;
  border: none;
}
/* 右侧：课件介绍与下载按钮 */
.cw-right {
  flex: 1 1 45%;
  padding: 45px 40px;
  display: flex;
  flex-direction: column;
  justify-content: center;
}
.cw-tag-group {
  margin-bottom: 18px;
}
.cw-tag-group span {
  display: inline-block;
  padding: 5px 12px;
  border-radius: 6px;
  font-size: 13px;
  font-weight: 700;
  margin-right: 10px;
}
.cw-tag-1 {
  background: #ebf5ff;
  color: #2563eb;
}
.cw-tag-2 {
  background: #fff7ed;
  color: #ea580c;
}
.cw-right h3 {
  font-size: 26px;
  font-weight: 700;
  color: #1a5276;
  margin-bottom: 16px;
  line-height: 1.4;
}
.cw-right p {
  font-size: 15px;
  line-height: 1.8;
  color: #555;
  margin-bottom: 25px;
}
.cw-features {
  list-style: none;
  padding: 0;
  margin: 0 0 35px 0;
}
.cw-features li {
  font-size: 14.5px;
  color: #444;
  margin-bottom: 12px;
  display: flex;
  align-items: center;
}
.cw-features li svg {
  width: 20px;
  height: 20px;
  fill: none;
  stroke: #27ae60;
  stroke-width: 2.5;
  stroke-linecap: round;
  stroke-linejoin: round;
  margin-right: 10px;
}
.cw-btn-group {
  display: flex;
  gap: 15px;
}
.cw-btn {
  padding: 12px 24px;
  border-radius: 8px;
  font-weight: 600;
  font-size: 14.5px;
  text-decoration: none;
  transition: all 0.3s ease;
  display: inline-flex;
  align-items: center;
  justify-content: center;
}
.cw-btn-outline {
  background: #fff;
  color: #3498db;
  border: 2px solid #3498db;
}
.cw-btn-outline:hover {
  background: #f0f8ff;
  transform: translateY(-2px);
}
.cw-btn-primary {
  background: linear-gradient(135deg, #3498db, #2980b9);
  color: #fff;
  border: none;
  box-shadow: 0 6px 15px rgba(52, 152, 219, 0.3);
}
.cw-btn-primary:hover {
  color: #fff;
  transform: translateY(-2px);
  box-shadow: 0 10px 25px rgba(52, 152, 219, 0.5);
}
.cw-btn svg {
  width: 18px;
  height: 18px;
  margin-right: 8px;
}
@media (max-width: 991px) {
  .cw-left,
  .cw-right {
    flex: 1 1 100%;
  }
  .cw-iframe-wrapper {
    height: 350px;
  }
  .cw-right {
    padding: 35px 25px;
  }
  .cw-btn-group {
    flex-direction: column;
  }
}
.system-architecture-section {
  background: #fdfefe; /* 极浅的灰白色，与上下区块形成微妙的呼吸感 */
  padding: 90px 0;
  border-top: 1px solid rgba(52, 152, 219, 0.05);
}
.arch-header h2 {
  color: #1a5276;
  font-weight: 800;
  margin-bottom: 0.8rem;
  font-size: 2.2rem;
  text-align: center;
}
.arch-header p {
  text-align: center;
  color: #5d6d7e;
  max-width: 800px;
  margin: 0 auto 40px;
  font-size: 1.05rem;
  line-height: 1.7;
}
.arch-image-card {
  background: #ffffff;
  border-radius: 16px;
  padding: 25px;
  box-shadow: 0 12px 35px rgba(0, 0, 0, 0.06);
  border: 1px solid rgba(52, 152, 219, 0.12);
  transition: transform 0.4s cubic-bezier(0.175, 0.885, 0.32, 1.275);
  text-align: center;
}
.arch-image-card:hover {
  transform: translateY(-5px);
  box-shadow: 0 20px 50px rgba(52, 152, 219, 0.1);
}
.arch-img-wrapper {
  position: relative;
  display: inline-block;
  width: 100%;
}
.arch-img {
  max-width: 100%;
  height: auto;
  border-radius: 8px;
  cursor: zoom-in; /* 提示用户可点击放大 */
}
.arch-caption {
  margin-top: 20px;
  padding-top: 15px;
  border-top: 1px dashed rgba(0, 0, 0, 0.1);
  font-size: 14px;
  color: #7f8c8d;
  font-weight: 600;
  letter-spacing: 0.5px;
}
.arch-caption span {
  color: #3498db;
}