/* ============================================
   Flora Liu · 刘臻简 个人网站 公共样式
   少女风：樱花粉 + 薰衣草紫 + 奶油白
   ============================================ */

:root {
  --pink: #f7a8c4;
  --pink-deep: #e75480;
  --pink-soft: #ffe3ee;
  --pink-bg: #fff8fb;
  --lavender: #b8a6e8;
  --lavender-soft: #ece6fb;
  --cream: #fffdf7;
  --ink: #5a4452;
  --ink-soft: #9b8492;
  --gold: #e8c07d;
  --card-shadow: 0 8px 28px rgba(231, 84, 128, 0.10);
  --card-shadow-hover: 0 14px 40px rgba(231, 84, 128, 0.20);
  --radius: 22px;
}

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

html { scroll-behavior: smooth; }

html[data-lang="zh"] [lang="en"] { display: none !important; }
html[data-lang="en"] [lang="zh"] { display: none !important; }

body {
  font-family: "Quicksand", "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", "Noto Sans SC", sans-serif;
  background: var(--pink-bg);
  color: var(--ink);
  line-height: 1.75;
  overflow-x: hidden;
}

/* ---------- 背景装饰 ---------- */
.bg-blobs { position: fixed; inset: 0; z-index: -2; overflow: hidden; pointer-events: none; }
.bg-blobs .blob { position: absolute; border-radius: 50%; filter: blur(70px); opacity: .5; }
.blob-1 { width: 480px; height: 480px; background: #ffd9e8; top: -140px; left: -120px; }
.blob-2 { width: 420px; height: 420px; background: #e4dcfb; top: 30%; right: -160px; }
.blob-3 { width: 520px; height: 520px; background: #ffe9d6; bottom: -180px; left: 22%; opacity: .4; }

/* ---------- 导航 ---------- */
.nav {
  position: sticky; top: 0; z-index: 50;
  display: flex; align-items: center; justify-content: space-between;
  padding: 14px 6vw;
  background: rgba(255, 248, 251, .82);
  backdrop-filter: blur(14px);
  -webkit-backdrop-filter: blur(14px);
  border-bottom: 1px solid rgba(231, 84, 128, .12);
}
.nav-logo {
  font-weight: 700; font-size: 1.15rem; letter-spacing: .5px;
  color: var(--pink-deep); text-decoration: none;
  display: flex; align-items: center; gap: 8px;
}
.nav-logo .flower { display: inline-block; animation: spin-slow 9s linear infinite; }
@keyframes spin-slow { to { transform: rotate(360deg); } }

.nav-links { display: flex; align-items: center; gap: 26px; }
.nav-links a {
  text-decoration: none; color: var(--ink); font-weight: 600; font-size: .95rem;
  padding: 6px 2px; position: relative; transition: color .25s;
}
.nav-links a::after {
  content: ""; position: absolute; left: 0; bottom: 0; height: 2px; width: 0;
  background: linear-gradient(90deg, var(--pink-deep), var(--lavender));
  border-radius: 2px; transition: width .3s;
}
.nav-links a:hover, .nav-links a.active { color: var(--pink-deep); }
.nav-links a:hover::after, .nav-links a.active::after { width: 100%; }

/* 语言切换 */
.lang-switch {
  display: inline-flex; align-items: center; gap: 2px;
  border: 1.5px solid var(--pink); border-radius: 999px;
  padding: 3px; background: #fff; user-select: none;
}
.lang-switch button {
  border: none; background: transparent; cursor: pointer;
  font-size: .82rem; font-weight: 700; color: var(--ink-soft);
  padding: 4px 12px; border-radius: 999px; transition: all .25s;
  font-family: inherit;
}
.lang-switch button.on {
  background: linear-gradient(135deg, var(--pink-deep), var(--lavender));
  color: #fff; box-shadow: 0 3px 10px rgba(231, 84, 128, .35);
}

/* ---------- Hero ---------- */
.hero {
  position: relative;
  text-align: center;
  padding: 100px 6vw 80px;
}
.petals { position: absolute; inset: 0; pointer-events: none; overflow: hidden; }
.petal {
  position: absolute; top: -40px; font-size: 20px; opacity: .8;
  animation: fall linear infinite;
}
@keyframes fall {
  0%   { transform: translateY(-6vh) rotate(0deg); opacity: 0; }
  10%  { opacity: .85; }
  100% { transform: translateY(110vh) rotate(340deg); opacity: 0; }
}

.hero-badge {
  display: inline-block; padding: 6px 20px; border-radius: 999px;
  background: #fff; border: 1.5px dashed var(--pink);
  color: var(--pink-deep); font-weight: 700; font-size: .85rem;
  margin-bottom: 26px; box-shadow: var(--card-shadow);
}
.hero h1 {
  font-size: clamp(2.3rem, 6vw, 4rem);
  line-height: 1.25; font-weight: 700;
  background: linear-gradient(120deg, var(--pink-deep) 20%, var(--lavender) 80%);
  -webkit-background-clip: text; background-clip: text;
  -webkit-text-fill-color: transparent; color: transparent;
}
.hero .subtitle {
  margin-top: 18px; font-size: 1.1rem; color: var(--ink-soft); font-weight: 600;
}
.hero .hero-emoji { font-size: 2.6rem; margin-top: 22px; letter-spacing: 12px; }
.hero-actions { margin-top: 34px; display: flex; gap: 16px; justify-content: center; flex-wrap: wrap; }
.btn {
  display: inline-block; text-decoration: none; font-weight: 700; font-size: .95rem;
  padding: 12px 30px; border-radius: 999px; transition: all .25s;
}
.btn-primary {
  background: linear-gradient(135deg, var(--pink-deep), #d76fa3);
  color: #fff; box-shadow: 0 8px 22px rgba(231, 84, 128, .35);
}
.btn-primary:hover { transform: translateY(-3px); box-shadow: 0 12px 28px rgba(231, 84, 128, .45); }
.btn-ghost {
  background: #fff; color: var(--pink-deep);
  border: 1.5px solid var(--pink);
}
.btn-ghost:hover { transform: translateY(-3px); box-shadow: var(--card-shadow-hover); }

/* ---------- 通用区块 ---------- */
.section { max-width: 920px; margin: 0 auto; padding: 40px 6vw 80px; }
.section-title {
  text-align: center; font-size: clamp(1.5rem, 3.4vw, 2rem); font-weight: 700;
  margin-bottom: 10px; color: var(--ink);
}
.section-title .deco { color: var(--pink-deep); }
.section-sub { text-align: center; color: var(--ink-soft); margin-bottom: 44px; font-size: .95rem; }

/* ---------- 时间线 ---------- */
.timeline { position: relative; padding: 10px 0; }
.timeline::before {
  content: ""; position: absolute; left: 50%; top: 0; bottom: 0; width: 3px;
  transform: translateX(-50%);
  background: linear-gradient(180deg, var(--pink-soft), var(--pink) 12%, var(--lavender) 88%, var(--lavender-soft));
  border-radius: 3px;
}
.tl-item {
  position: relative; width: 50%; padding: 18px 46px 18px 0;
  margin-left: 0; text-align: right;
}
.tl-item:nth-child(even) {
  margin-left: 50%; padding: 18px 0 18px 46px; text-align: left;
}
.tl-item::before {
  content: "♥"; position: absolute; top: 30px;
  right: -11px; width: 22px; height: 22px;
  display: flex; align-items: center; justify-content: center;
  background: #fff; border: 2.5px solid var(--pink-deep); border-radius: 50%;
  color: var(--pink-deep); font-size: 10px; z-index: 2;
}
.tl-item:nth-child(even)::before { right: auto; left: -11px; }
.tl-item.latest::before { content: "★"; border-color: var(--gold); color: var(--gold); }

.tl-card {
  display: inline-block; max-width: 400px; text-align: left;
  background: #fff; border-radius: var(--radius);
  padding: 18px 22px; box-shadow: var(--card-shadow);
  border: 1px solid rgba(247, 168, 196, .35);
  transition: transform .25s, box-shadow .25s;
}
.tl-card:hover { transform: translateY(-4px); box-shadow: var(--card-shadow-hover); }
.age-chip {
  display: inline-block; font-size: .8rem; font-weight: 700;
  padding: 3px 12px; border-radius: 999px; color: #fff; margin-bottom: 8px;
  background: linear-gradient(135deg, var(--pink-deep), var(--lavender));
  letter-spacing: .5px;
}
.tl-item.latest .age-chip { background: linear-gradient(135deg, var(--gold), #e2905a); }
.tl-text { font-size: .95rem; }
.tl-text .hl { color: var(--pink-deep); font-weight: 700; }
.tl-icon { font-size: 1.2rem; margin-right: 6px; }
.tl-link { display: inline-block; margin-top: 8px; font-size: .85rem; font-weight: 700; color: var(--pink-deep); text-decoration: none; }
.tl-link:hover { text-decoration: underline; }

/* ---------- 高亮卡片 ---------- */
.highlight-card {
  background: linear-gradient(135deg, #fff, var(--lavender-soft));
  border: 1.5px solid var(--lavender);
  border-radius: 28px; padding: 36px 34px;
  box-shadow: var(--card-shadow);
  display: flex; gap: 24px; align-items: center; flex-wrap: wrap;
}
.highlight-card .big-emoji { font-size: 3rem; }
.highlight-card h3 { font-size: 1.25rem; margin-bottom: 8px; color: var(--ink); }
.highlight-card p { color: var(--ink-soft); font-size: .95rem; }
.highlight-card .grow { flex: 1 1 320px; }

/* ---------- 文章页（左右页） ---------- */
.article { max-width: 860px; margin: 0 auto; padding: 30px 6vw 90px; }
.article h2 {
  font-size: 1.5rem; margin: 56px 0 18px; color: var(--pink-deep);
  display: flex; align-items: center; gap: 10px;
}
.article h2 .num {
  display: inline-flex; align-items: center; justify-content: center;
  width: 34px; height: 34px; border-radius: 12px; flex: none;
  background: linear-gradient(135deg, var(--pink-deep), var(--lavender));
  color: #fff; font-size: .95rem;
}
.article p { margin-bottom: 16px; }
.article .lead { font-size: 1.05rem; color: var(--ink-soft); }
.article strong { color: var(--pink-deep); }

.info-box {
  background: #fff; border-left: 5px solid var(--pink);
  border-radius: 0 16px 16px 0; padding: 18px 22px;
  margin: 22px 0; box-shadow: var(--card-shadow); font-size: .95rem;
}
.info-box.purple { border-left-color: var(--lavender); background: var(--lavender-soft); }
.info-box.gold { border-left-color: var(--gold); background: #fff8ec; }

.step-list { counter-reset: step; list-style: none; margin: 24px 0; }
.step-list li {
  counter-increment: step; position: relative;
  background: #fff; border-radius: 18px; padding: 20px 22px 20px 66px;
  margin-bottom: 16px; box-shadow: var(--card-shadow);
  border: 1px solid rgba(247, 168, 196, .3);
}
.step-list li::before {
  content: counter(step); position: absolute; left: 18px; top: 20px;
  width: 34px; height: 34px; border-radius: 50%;
  display: flex; align-items: center; justify-content: center;
  background: linear-gradient(135deg, var(--pink-deep), var(--lavender));
  color: #fff; font-weight: 700;
}

/* 镜子演示 */
.mirror-demo {
  background: #fff; border-radius: 24px; padding: 30px;
  box-shadow: var(--card-shadow); text-align: center; margin: 26px 0;
  border: 1.5px dashed var(--pink);
}
.mirror-stage {
  display: flex; justify-content: center; align-items: center; gap: 0;
  font-size: 1.3rem; font-weight: 700; margin-bottom: 18px; flex-wrap: wrap;
}
.mirror-half {
  padding: 18px 30px; color: var(--pink-deep);
  transition: transform .6s ease;
}
.mirror-half.right { color: var(--lavender); }
.mirror-demo.mirrored .mirror-half { transform: scaleX(-1); }
.mirror-divider { width: 3px; align-self: stretch; background: linear-gradient(180deg, transparent, var(--pink), transparent); }
.mirror-btn {
  border: none; cursor: pointer; font-family: inherit;
  font-weight: 700; font-size: .9rem; color: #fff;
  padding: 10px 26px; border-radius: 999px;
  background: linear-gradient(135deg, var(--pink-deep), var(--lavender));
  box-shadow: 0 6px 18px rgba(231, 84, 128, .3);
  transition: transform .2s;
}
.mirror-btn:hover { transform: translateY(-2px); }

/* 实验示意图 */
.wu-figure {
  background: linear-gradient(135deg, #fff, var(--pink-soft));
  border-radius: 24px; padding: 34px 20px; margin: 26px 0;
  text-align: center; box-shadow: var(--card-shadow);
}
.wu-coil {
  width: 150px; height: 110px; margin: 0 auto; position: relative;
  border: 7px solid var(--lavender); border-radius: 30px;
  background: repeating-linear-gradient(45deg, var(--lavender-soft) 0 8px, #fff 8px 16px);
}
.wu-arrows { display: flex; justify-content: space-between; margin: 14px auto 0; max-width: 380px; font-size: 1.7rem; }
.wu-label { font-size: .85rem; color: var(--ink-soft); margin-top: 12px; }

/* ---------- 页脚 ---------- */
.footer {
  margin-top: 40px; padding: 44px 6vw 34px;
  background: linear-gradient(180deg, transparent, rgba(247, 168, 196, .18));
  border-top: 1px solid rgba(231, 84, 128, .14);
  text-align: center;
}
.footer-domains { display: flex; justify-content: center; gap: 14px; flex-wrap: wrap; margin-bottom: 16px; }
.footer-domains span {
  padding: 6px 18px; border-radius: 999px; background: #fff;
  border: 1.5px solid var(--pink); color: var(--pink-deep);
  font-weight: 700; font-size: .85rem; box-shadow: 0 3px 10px rgba(231, 84, 128, .12);
}
.footer .copy { color: var(--ink-soft); font-size: .82rem; }
.footer .hearts { margin-top: 10px; color: var(--pink); letter-spacing: 6px; }

/* ---------- 响应式 ---------- */
@media (max-width: 760px) {
  .timeline::before { left: 14px; transform: none; }
  .tl-item, .tl-item:nth-child(even) {
    width: 100%; margin-left: 0; padding: 14px 0 14px 44px; text-align: left;
  }
  .tl-item::before, .tl-item:nth-child(even)::before { left: 4px; right: auto; }
  .tl-card { max-width: 100%; }
  .nav-links { gap: 14px; }
  .nav-links a { font-size: .85rem; }
  .hero { padding-top: 70px; }
}