/* ============================================================
   初霁 · 官网落地页样式（Phase 9 · Task 37）
   粉色主题 #e91e63，移动端优先，响应式
   ============================================================ */

:root {
  --pink: #e91e63;
  --pink-dark: #c2185b;
  --pink-light: #ff6f9f;
  --bg: #fff5f8;
  --bg-deep: #1a1f3a;
  --text: #3a3340;
  --text-muted: #8a8290;
  --card: #ffffff;
  --radius: 18px;
  --shadow: 0 10px 30px rgba(233, 30, 99, 0.10);
  --shadow-lg: 0 18px 45px rgba(233, 30, 99, 0.18);
}

* { margin: 0; padding: 0; box-sizing: border-box; }

html { scroll-behavior: smooth; }

body {
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", "PingFang SC",
    "Hiragino Sans GB", "Microsoft YaHei", sans-serif;
  background: var(--bg);
  color: var(--text);
  line-height: 1.6;
  -webkit-font-smoothing: antialiased;
}

a { text-decoration: none; color: inherit; }
img { max-width: 100%; display: block; }

/* ---------- 加载动画 ---------- */
.loader {
  position: fixed; inset: 0; z-index: 9999;
  display: flex; flex-direction: column; align-items: center; justify-content: center;
  background: linear-gradient(160deg, #fff0f6, #ffe3ec);
  transition: opacity 0.6s ease;
}
.loader.hide { opacity: 0; pointer-events: none; }
.loader-heart {
  font-size: 44px; color: var(--pink);
  animation: heartBeat 1.1s ease-in-out infinite;
}
.loader p { margin-top: 10px; color: var(--pink-dark); font-size: 14px; letter-spacing: 2px; }

@keyframes heartBeat {
  0%, 100% { transform: scale(1); }
  25% { transform: scale(1.25); }
  45% { transform: scale(0.95); }
  60% { transform: scale(1.15); }
}

/* ---------- 按钮 ---------- */
.btn {
  display: inline-flex; align-items: center; justify-content: center; gap: 8px;
  padding: 12px 26px; border-radius: 999px; font-size: 15px; font-weight: 600;
  cursor: pointer; transition: transform 0.2s, box-shadow 0.2s, background 0.2s;
  border: none;
}
.btn-primary { background: var(--pink); color: #fff; box-shadow: var(--shadow); }
.btn-primary:hover { background: var(--pink-dark); transform: translateY(-2px); box-shadow: var(--shadow-lg); }
.btn-ghost { background: transparent; color: var(--pink-dark); border: 2px solid var(--pink-light); }
.btn-ghost:hover { background: rgba(233, 30, 99, 0.08); transform: translateY(-2px); }
.btn-sm { padding: 8px 16px; font-size: 13px; }
.btn-lg { padding: 15px 34px; font-size: 16px; }

/* ---------- 导航 ---------- */
.nav { position: sticky; top: 0; z-index: 100; background: rgba(255, 245, 248, 0.85); backdrop-filter: blur(12px); border-bottom: 1px solid rgba(233, 30, 99, 0.10); }
.nav-inner { max-width: 1080px; margin: 0 auto; padding: 12px 20px; display: flex; align-items: center; justify-content: space-between; gap: 12px; }
.brand { display: flex; align-items: center; gap: 8px; font-weight: 800; font-size: 18px; color: var(--pink-dark); }
.brand-logo { width: 30px; height: 30px; border-radius: 9px; object-fit: cover; }
.nav-links { display: flex; gap: 22px; font-size: 14px; color: var(--text-muted); }
.nav-links a { transition: color 0.2s; }
.nav-links a:hover { color: var(--pink); }

/* ---------- Hero ---------- */
.hero { position: relative; overflow: hidden; padding: 60px 20px 70px; }
.hero-bg {
  position: absolute; inset: 0; z-index: 0;
  background:
    radial-gradient(600px 300px at 20% 10%, rgba(233, 30, 99, 0.12), transparent 60%),
    radial-gradient(500px 300px at 85% 80%, rgba(255, 111, 159, 0.18), transparent 60%),
    linear-gradient(180deg, #fff0f6 0%, #fff5f8 60%, #fff 100%);
}
.hero-content { position: relative; z-index: 1; max-width: 1080px; margin: 0 auto; display: grid; grid-template-columns: 1.1fr 0.9fr; gap: 40px; align-items: center; }
.hero-text h1 { font-size: 40px; line-height: 1.2; letter-spacing: 1px; color: var(--pink-dark); }
.hero-sub { margin-top: 12px; font-size: 20px; font-weight: 700; color: var(--pink); }
.hero-desc { margin-top: 14px; font-size: 15px; color: var(--text-muted); max-width: 480px; }
.hero-actions { margin-top: 26px; display: flex; gap: 14px; flex-wrap: wrap; }
.hero-badges { margin-top: 22px; display: flex; gap: 10px; flex-wrap: wrap; }
.hero-badges span { background: #fff; border: 1px solid rgba(233, 30, 99, 0.18); color: var(--pink-dark); font-size: 12px; padding: 5px 12px; border-radius: 999px; box-shadow: 0 4px 12px rgba(233, 30, 99, 0.08); }

.hero-visual { display: flex; justify-content: center; }
.avatar-card { position: relative; width: 220px; }
.avatar-card .avatar-img { width: 220px; height: 220px; border-radius: 50%; object-fit: cover; box-shadow: var(--shadow-lg); border: 6px solid #fff; animation: float 4s ease-in-out infinite; }
.avatar-bubble {
  position: absolute; top: 14px; left: -90px;
  background: #fff; color: var(--pink-dark); font-size: 13px; font-weight: 600;
  padding: 8px 14px; border-radius: 14px 14px 14px 4px; box-shadow: var(--shadow);
  animation: float 4s ease-in-out infinite; animation-delay: 1s;
}
@keyframes float {
  0%, 100% { transform: translateY(0); }
  50% { transform: translateY(-10px); }
}

/* ---------- 功能 ---------- */
.features { max-width: 1080px; margin: 0 auto; padding: 70px 20px; }
.section-head { text-align: center; margin-bottom: 40px; }
.section-head h2 { font-size: 30px; color: var(--pink-dark); }
.section-head p { margin-top: 8px; color: var(--text-muted); font-size: 14px; }
.cards { display: grid; grid-template-columns: repeat(4, 1fr); gap: 20px; }
.card {
  background: var(--card); border-radius: var(--radius); padding: 28px 22px;
  box-shadow: var(--shadow); border: 1px solid rgba(233, 30, 99, 0.08);
  transition: transform 0.25s, box-shadow 0.25s;
}
.card:hover { transform: translateY(-6px); box-shadow: var(--shadow-lg); }
.card-icon { font-size: 34px; }
.card h3 { margin-top: 14px; font-size: 17px; color: var(--pink-dark); }
.card p { margin-top: 8px; font-size: 13px; color: var(--text-muted); line-height: 1.7; }

/* ---------- 下载 ---------- */
.download { padding: 40px 20px 70px; }
.download-card {
  max-width: 560px; margin: 0 auto; text-align: center;
  background: linear-gradient(160deg, #fff, #ffeef5);
  border: 1px solid rgba(233, 30, 99, 0.15); border-radius: 26px;
  padding: 44px 28px; box-shadow: var(--shadow-lg);
}
.download-card h2 { font-size: 28px; color: var(--pink-dark); }
.download-desc { margin-top: 8px; color: var(--text-muted); font-size: 14px; }
.download-card .btn { margin-top: 24px; }
.download-meta { margin-top: 22px; list-style: none; color: var(--text-muted); font-size: 13px; }
.download-meta li { margin-top: 6px; }
.download-note { margin-top: 24px; display: flex; align-items: center; justify-content: center; gap: 12px; color: var(--text-muted); font-size: 12px; }
.qr-placeholder {
  width: 60px; height: 60px; border-radius: 10px;
  background: #fff; border: 1px dashed rgba(233, 30, 99, 0.4);
  display: grid; place-items: center; font-size: 26px; color: rgba(233, 30, 99, 0.5);
}

/* ---------- Footer ---------- */
.footer { background: var(--bg-deep); color: rgba(255, 255, 255, 0.75); padding: 44px 20px; }
.footer-inner { max-width: 1080px; margin: 0 auto; display: flex; flex-direction: column; align-items: center; gap: 14px; text-align: center; }
.footer-brand { display: flex; align-items: center; gap: 8px; font-weight: 800; color: #fff; }
.footer-desc { font-size: 13px; color: rgba(255, 255, 255, 0.55); }
.footer-links { display: flex; gap: 22px; font-size: 13px; }
.footer-links a { color: var(--pink-light); }
.footer-links a:hover { color: #fff; }
.footer-meta { display: flex; flex-direction: column; gap: 6px; font-size: 12px; color: rgba(255, 255, 255, 0.4); }

/* ---------- 响应式（移动端优先） ---------- */
@media (max-width: 900px) {
  .hero-content { grid-template-columns: 1fr; text-align: center; }
  .hero-desc { margin-left: auto; margin-right: auto; }
  .hero-actions, .hero-badges { justify-content: center; }
  .avatar-bubble { left: 50%; transform: translateX(-140px); }
  .avatar-bubble { animation: float 4s ease-in-out infinite; animation-delay: 1s; }
  .cards { grid-template-columns: repeat(2, 1fr); }
}

@media (max-width: 520px) {
  .nav-links { display: none; }
  .hero-text h1 { font-size: 30px; }
  .cards { grid-template-columns: 1fr; }
  .avatar-card, .avatar-card .avatar-img { width: 170px; height: 170px; }
  .avatar-bubble { left: auto; right: -8px; transform: none; }
  .section-head h2 { font-size: 24px; }
}
/* ---------- 滚动渐入（script.js 控制 .in-view） ---------- */
.card {
  opacity: 0;
  transform: translateY(24px);
  transition: opacity 0.55s ease, transform 0.55s ease, box-shadow 0.25s;
}
.card.in-view {
  opacity: 1;
  transform: translateY(0);
}
.card:hover {
  transform: translateY(-6px);
}