.gradient-purple {
  background-image: linear-gradient(135deg, #818cf8 0%, #a855f7 100%);
}

.gradient-purple-red {
  background-image: linear-gradient(135deg, #4e45e5 30%, #e8345a 70%);
}

.hero-bg {
  background: url('../imgs/index-banner-bg.jpg') center bottom no-repeat;
  background-size: 100% 100%;
}

/* 高阶渐变与光影效果 */
.premium-card {
  position: relative;
  border-radius: var(--card-radius);
  overflow: hidden;
  background: white;
  transition: all 0.5s cubic-bezier(0.4, 0, 0.2, 1);
  box-shadow: 0 10px 30px -10px rgba(0, 0, 0, 0.05);
}

.premium-card:hover {
  transform: translateY(-8px);
  box-shadow: 0 25px 50px -12px rgba(0, 0, 0, 0.08);
}

/* 卡片1: 一键生成PPT - 紫色到深蓝 */
.bg-ppt-gen {
  background: linear-gradient(135deg, #f3f0ff 0%, #e0e7ff 45%, #dbeafe 100%);
}

.bg-ppt-gen::before {
  content: "";
  position: absolute;
  top: -20%;
  right: -10%;
  width: 70%;
  height: 70%;
  background: radial-gradient(circle, rgba(139, 92, 246, 0.15) 0%, rgba(59, 130, 246, 0.05) 70%, transparent 100%);
  border-radius: 50%;
  filter: blur(40px);
}

/* 卡片2: 智能写作 - 绿色到青色 */
.bg-ai-write {
  background: linear-gradient(135deg, #f0fdf4 0%, #dcfce7 45%, #ccfbf1 100%);
}

.bg-ai-write::before {
  content: "";
  position: absolute;
  bottom: -20%;
  left: -10%;
  width: 70%;
  height: 70%;
  background: radial-gradient(circle, rgba(16, 185, 129, 0.15) 0%, rgba(20, 184, 166, 0.05) 70%, transparent 100%);
  border-radius: 50%;
  filter: blur(40px);
}

/* 卡片3: 公文模板 - 橙色到金色 */
.bg-template-gallery {
  background: linear-gradient(135deg, #fff7ed 0%, #fef3c7 45%, #ffd85a 100%);
}

.bg-template-gallery::before {
  content: "";
  position: absolute;
  top: 50%;
  right: -15%;
  transform: translateY(-50%);
  width: 80%;
  height: 60%;
  background: radial-gradient(circle, rgba(245, 158, 11, 0.12) 0%, rgba(251, 191, 36, 0.04) 70%, transparent 100%);
  border-radius: 50%;
  filter: blur(50px);
}

/* 抽象装饰元素样式 */
.abstract-decoration {
  position: absolute;
  opacity: 0.06;
  pointer-events: none;
  transition: transform 0.8s ease;
}

.premium-card:hover .abstract-decoration {
  transform: scale(1.1) rotate(5deg);
}

/* 首页功能卡片 */
.feature-card {
  position: relative;
  display: flex;
  gap: 18px;
  min-height: 260px;
  padding: 26px 28px;
  overflow: hidden;
  border: 1px solid rgba(255, 255, 255, 0.7);
  border-radius: 28px;
  box-shadow: 0 14px 34px -20px rgba(15, 23, 42, 0.35);
  transition: transform 0.35s ease, box-shadow 0.35s ease;
}

.feature-card:hover {
  transform: translateY(-7px);
  box-shadow: 0 24px 42px -20px rgba(15, 23, 42, 0.38);
}

.feature-card__icon {
  position: relative;
  z-index: 1;
  display: flex;
  flex: 0 0 auto;
  width: 64px;
  height: 64px;
  align-items: center;
  justify-content: center;
  border-radius: 19px;
  transition: background-color 0.35s ease;
}

.feature-card__icon iconify-icon {
  position: relative;
  z-index: 1;
  font-size: 31px;
  transition: color 0.35s ease;
}

.feature-card__icon-glow {
  position: absolute;
  inset: 0;
  border-radius: inherit;
  opacity: 0.22;
  filter: blur(14px);
  transition: opacity 0.35s ease;
}

.feature-card:hover .feature-card__icon-glow {
  opacity: 0.42;
}

.feature-card__icon-decoration {
  position: absolute;
  right: -6px;
  bottom: -6px;
  width: 22px;
  height: 22px;
  border: 4px solid #fff;
  border-radius: 50%;
}

.feature-card__content {
  position: relative;
  z-index: 1;
  display: flex;
  flex: 1;
  flex-direction: column;
  min-width: 0;
}

.feature-card__content h3 {
  margin: 2px 0 8px;
  color: #1e293b;
  font-size: 24px;
  font-weight: 700;
  line-height: 1.3;
  transition: color 0.35s ease;
}

.feature-card__content > p {
  min-height: 0;
  margin: 0;
  color: #64748b;
  font-size: 15px;
  line-height: 1.55;
}

.feature-card__tags {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  margin-top: 12px;
}

.feature-card__tags span {
  padding: 5px 10px;
  border: 0;
  font-size: 12px;
  line-height: 1.2;
}

.feature-card__action {
  display: inline-flex;
  width: fit-content;
  align-items: center;
  gap: 8px;
  margin-top: auto;
  padding: 10px 16px;
  border-radius: 14px;
  color: #fff;
  font-size: 14px;
  font-weight: 600;
  box-shadow: 0 10px 18px -12px currentColor;
  transition: transform 0.25s ease, filter 0.25s ease;
}

.feature-card__action iconify-icon {
  font-size: 15px;
  transition: transform 0.25s ease;
}

.feature-card:hover .feature-card__action {
  filter: brightness(0.94);
  transform: translateY(-2px);
}

.feature-card:hover .feature-card__action iconify-icon {
  transform: translateX(3px);
}

.feature-card__background-decoration {
  position: absolute;
  right: -62px;
  bottom: -62px;
  width: 180px;
  height: 180px;
  border-radius: 50%;
  opacity: 0.48;
  transition: transform 0.65s ease;
}

.feature-card:hover .feature-card__background-decoration {
  transform: scale(1.35);
}

.bg-ppt-gen {
  background: rgba(255, 255, 255, 0.82);
}

.bg-ppt-gen .feature-card__icon {
  background: #f1ebff;
}

.bg-ppt-gen .feature-card__icon-glow,
.bg-ppt-gen .feature-card__background-decoration {
  background: #d9c8ff;
}

.bg-ppt-gen .feature-card__icon-decoration {
  background: #a855f7;
}

.bg-ppt-gen .feature-card__action {
  background: #7c3aed;
}

.bg-ppt-gen:hover .feature-card__icon {
  background: #7c3aed;
}

.bg-ppt-gen:hover .feature-card__content h3 {
  color: #7c3aed;
}

.bg-ai-write {
  background: rgba(255, 255, 255, 0.82);
}

.bg-ai-write .feature-card__icon {
  background: #dcfce7;
}

.bg-ai-write .feature-card__icon-glow,
.bg-ai-write .feature-card__background-decoration {
  background: #a7f3d0;
}

.bg-ai-write .feature-card__icon-decoration {
  background: #10b981;
  border-radius: 7px;
  transform: rotate(12deg);
}

.bg-ai-write .feature-card__action {
  background: #059669;
}

.bg-ai-write:hover .feature-card__icon {
  background: #059669;
}

.bg-ai-write:hover .feature-card__content h3 {
  color: #059669;
}

.bg-template-gallery {
  background: rgba(255, 255, 255, 0.82);
}

.bg-template-gallery .feature-card__icon {
  background: #fff4d6;
}

.bg-template-gallery .feature-card__icon-glow,
.bg-template-gallery .feature-card__background-decoration {
  background: #fde68a;
}

.bg-template-gallery .feature-card__icon-decoration {
  background: #f97316;
}

.bg-template-gallery .feature-card__action {
  background: #ea580c;
}

.bg-template-gallery:hover .feature-card__icon {
  background: #ea580c;
}

.bg-template-gallery:hover .feature-card__content h3 {
  color: #ea580c;
}

.feature-card:hover .bg-ppt-gen,
.bg-ppt-gen:hover .feature-card__icon iconify-icon,
.bg-ai-write:hover .feature-card__icon iconify-icon,
.bg-template-gallery:hover .feature-card__icon iconify-icon {
  color: #fff;
}

@media (max-width: 767px) {
  .feature-card {
    flex-direction: column;
    gap: 14px;
    min-height: 0;
    padding: 24px;
  }

  .feature-card__content h3 {
    margin-top: 0;
  }
}

/* 玻璃纹理 */
.glass-inner {
  background: rgba(255, 255, 255, 0.3);
  backdrop-filter: blur(4px);
  border: 1px solid rgba(255, 255, 255, 0.5);
}

/* 专题页样式 */
.topic-banner {
  position: relative;
  width: 100%;
  height: 400px;
  margin-top: 80px; /* 为header留出空间，避免重叠 */
  overflow: hidden;
}

/* Banner图片 */
.topic-banner-image {
  width: 100%;
  height: 100%;
  object-fit: cover;
  object-position: center;
}

.topic-banner-overlay {
  position: absolute;
  inset: 0;
  background: linear-gradient(135deg, rgba(0, 0, 0, 0.6) 0%, rgba(0, 0, 0, 0.4) 100%);
  z-index: 1;
}

.topic-stats {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 12px 24px;
  background: rgba(255, 255, 255, 0.15);
  backdrop-filter: blur(10px);
  border-radius: 9999px;
  border: 1px solid rgba(255, 255, 255, 0.3);
  font-size: 16px;
  font-weight: 600;
}