/* ============================================================
   index.css — 首页样式
   结构：hero 大 logo 展示 + 三个小节
   ============================================================ */

/* ---------- Hero ---------- */
.hero {
  position: relative;
  display: flex;
  align-items: center;
  justify-content: center;
  min-height: calc(100vh - var(--header-h));
  padding: clamp(3rem, 8vw, 6.5rem) 0;
  text-align: center;
  overflow: hidden;
}

.hero-logo {
  height: clamp(92px, 11vw, 150px);
  width: auto;
  margin-inline: auto;
  filter: drop-shadow(0 16px 32px rgba(109, 94, 247, 0.4));
  animation: hero-float 5s ease-in-out infinite;
}

@keyframes hero-float {
  0%, 100% { transform: translateY(0); }
  50% { transform: translateY(-10px); }
}

.hero h1 {
  margin-top: 1.4rem;
  font-size: clamp(2.2rem, 5.5vw, 3.6rem);
  font-weight: 800;
  letter-spacing: 0.02em;
  background: var(--title-gradient);
  -webkit-background-clip: text;
  background-clip: text;
  -webkit-text-fill-color: transparent;
  color: transparent;
}

.hero-sub {
  max-width: 620px;
  margin: 0.9rem auto 0;
  color: var(--text-2);
  font-size: clamp(1rem, 1.6vw, 1.15rem);
}

.hero-actions {
  display: flex;
  justify-content: center;
  flex-wrap: wrap;
  gap: 0.9rem;
  margin-top: 2.2rem;
}

.hero-stats {
  display: flex;
  justify-content: center;
  flex-wrap: wrap;
  gap: 2.8rem;
  margin-top: 3.2rem;
}

.stat b {
  display: block;
  font-size: 1.6rem;
  color: var(--primary);
}

.stat span {
  color: var(--text-2);
  font-size: 0.88rem;
}

/* ---------- 小节 ---------- */
.index-section {
  padding-block: 3.5rem;
}

.index-section.alt {
  background: var(--surface);
  border-block: 1px solid var(--border);
}

/* 快速开始：三步卡片 */
.step-grid {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 1.4vw;
}

.step-card {
  padding: 1.6rem 1.5rem;
  position: relative;
}

.step-num {
  font-size: 2rem;
  font-weight: 800;
  color: var(--primary);
  opacity: 0.85;
  line-height: 1;
}

.step-card h3 {
  margin-top: 0.8rem;
  font-size: 1.05rem;
}

.step-card p {
  margin-top: 0.4rem;
  color: var(--text-2);
  font-size: 0.92rem;
}

/* 核心特性：六卡片 */
.feature-grid {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 1.4vw;
}

.feature-card {
  padding: 1.5rem;
}

.feature-icon {
  width: 46px;
  height: 46px;
  border-radius: 12px;
  background: var(--primary-soft);
  color: var(--primary);
  display: grid;
  place-items: center;
  margin-bottom: 0.9rem;
}

.feature-card h3 {
  font-size: 1.02rem;
}

.feature-card p {
  margin-top: 0.35rem;
  color: var(--text-2);
  font-size: 0.92rem;
}

/* 最新动态：新闻卡片 */
.news-grid {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 1.4vw;
}

.news-card {
  padding: 1.4rem 1.5rem;
}

.news-date {
  display: inline-block;
  font-size: 0.78rem;
  color: var(--text-2);
  background: var(--surface-2);
  border-radius: 999px;
  padding: 0.15rem 0.7rem;
  margin-bottom: 0.8rem;
}

.news-card h3 {
  font-size: 1.02rem;
}

.news-card p {
  margin-top: 0.35rem;
  color: var(--text-2);
  font-size: 0.92rem;
}

/* ---------- 响应式 ---------- */
@media (max-width: 1100px) {
  .step-grid,
  .feature-grid,
  .news-grid {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }
}

@media (max-width: 640px) {
  .step-grid,
  .feature-grid,
  .news-grid {
    grid-template-columns: 1fr;
  }

  .hero-stats {
    gap: 1.8rem;
  }
}