:root {
  --bg: #fff8ef;
  --card-bg: #ffffff;
  --text: #2d2a32;
  --text-soft: #6b6570;
  --accent1: #ff6b6b;
  --accent2: #ffb84c;
  --accent3: #4ecdc4;
  --accent4: #a78bfa;
  --shadow: 0 8px 24px rgba(45, 42, 50, 0.08);
  --radius: 20px;
}

* { box-sizing: border-box; }

body {
  margin: 0;
  font-family: "PingFang SC", "Microsoft YaHei", "Helvetica Neue", Arial, sans-serif;
  background: var(--bg);
  color: var(--text);
  line-height: 1.6;
}

/* ---------- Header ---------- */
.site-header {
  position: relative;
  overflow: hidden;
  padding: 56px 20px 72px;
  text-align: center;
  background: linear-gradient(135deg, #ff9a8b 0%, #ff6a88 25%, #ffb84c 60%, #4ecdc4 100%);
  color: white;
}

.header-inner { position: relative; z-index: 2; }

.logo {
  font-size: 2.4rem;
  font-weight: 800;
  letter-spacing: 1px;
  text-shadow: 0 4px 12px rgba(0,0,0,0.15);
}

.tagline {
  margin: 12px auto 0;
  max-width: 560px;
  font-size: 1.05rem;
  opacity: 0.95;
}

.header-blob {
  position: absolute;
  border-radius: 50%;
  opacity: 0.25;
  background: white;
  filter: blur(2px);
}
.blob1 { width: 180px; height: 180px; top: -60px; left: -40px; }
.blob2 { width: 120px; height: 120px; bottom: -50px; right: 10%; }
.blob3 { width: 90px; height: 90px; top: 20px; right: -20px; }

/* ---------- Intro ---------- */
.intro {
  max-width: 760px;
  margin: -36px auto 0;
  background: var(--card-bg);
  border-radius: var(--radius);
  box-shadow: var(--shadow);
  padding: 24px 28px;
  position: relative;
  z-index: 3;
}

.intro p { margin: 0 0 10px; }
.intro p:last-child { margin-bottom: 0; }

.demo-note {
  font-size: 0.88rem;
  color: var(--text-soft);
  background: #fff4e0;
  border-left: 4px solid var(--accent2);
  padding: 10px 14px;
  border-radius: 8px;
}

.demo-note code {
  background: rgba(0,0,0,0.06);
  padding: 1px 6px;
  border-radius: 4px;
}

/* ---------- Filter bar ---------- */
.filter-bar {
  max-width: 900px;
  margin: 32px auto 0;
  padding: 0 20px;
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
  justify-content: center;
}

.filter-btn {
  border: none;
  background: white;
  color: var(--text);
  padding: 10px 18px;
  border-radius: 999px;
  font-size: 0.95rem;
  cursor: pointer;
  box-shadow: 0 2px 8px rgba(0,0,0,0.06);
  transition: transform 0.15s ease, background 0.15s ease, color 0.15s ease;
}

.filter-btn:hover { transform: translateY(-2px); }

.filter-btn.active {
  background: linear-gradient(135deg, var(--accent1), var(--accent2));
  color: white;
  font-weight: 600;
}

/* ---------- Grid / Cards ---------- */
.grid {
  max-width: 1000px;
  margin: 28px auto 0;
  padding: 0 20px 20px;
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(280px, 1fr));
  gap: 20px;
}

.card {
  background: var(--card-bg);
  border-radius: var(--radius);
  box-shadow: var(--shadow);
  padding: 20px;
  display: flex;
  flex-direction: column;
  gap: 10px;
  border-top: 5px solid var(--accent3);
  transition: transform 0.18s ease, box-shadow 0.18s ease;
}

.card:hover {
  transform: translateY(-4px);
  box-shadow: 0 14px 30px rgba(45,42,50,0.14);
}

.card[data-cat="naming"]   { border-top-color: var(--accent1); }
.card[data-cat="family"]   { border-top-color: var(--accent2); }
.card[data-cat="dialect"]  { border-top-color: var(--accent3); }
.card[data-cat="contrast"] { border-top-color: var(--accent4); }
.card[data-cat="pun"]      { border-top-color: #ff9f43; }
.card[data-cat="sweet"]    { border-top-color: #ff6bb0; }

.card-cat {
  align-self: flex-start;
  font-size: 0.78rem;
  font-weight: 700;
  padding: 4px 10px;
  border-radius: 999px;
  background: #f1f0f4;
  color: var(--text-soft);
}

.card h3 {
  margin: 0;
  font-size: 1.15rem;
  line-height: 1.4;
}

.card-content {
  white-space: pre-line;
  font-size: 0.94rem;
  color: var(--text);
  flex: 1;
}

.card-tags {
  display: flex;
  flex-wrap: wrap;
  gap: 6px;
}

.tag {
  font-size: 0.76rem;
  background: #eef7ff;
  color: #3d7ab8;
  padding: 2px 9px;
  border-radius: 999px;
}

.card-note {
  font-size: 0.78rem;
  color: var(--text-soft);
  border-top: 1px dashed #e5e2ea;
  padding-top: 8px;
  margin-top: auto;
}

.demo-badge {
  display: inline-block;
  font-size: 0.72rem;
  font-weight: 700;
  color: #b8860b;
  background: #fff2cc;
  padding: 2px 8px;
  border-radius: 6px;
  margin-right: 6px;
}

/* ---------- Theory section ---------- */
.theory {
  max-width: 1000px;
  margin: 48px auto 0;
  padding: 0 20px 40px;
  text-align: center;
}

.theory h2 {
  font-size: 1.5rem;
  margin-bottom: 24px;
}

.theory-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(180px, 1fr));
  gap: 16px;
  text-align: left;
}

.theory-card {
  background: var(--card-bg);
  border-radius: 16px;
  padding: 18px;
  box-shadow: var(--shadow);
}

.theory-emoji { font-size: 1.8rem; }

.theory-card h3 { margin: 8px 0 6px; font-size: 1.02rem; }
.theory-card p { margin: 0; font-size: 0.88rem; color: var(--text-soft); }

.theory-footer {
  margin-top: 22px;
  font-size: 0.85rem;
  color: var(--text-soft);
}

.theory-footer code {
  background: rgba(0,0,0,0.06);
  padding: 1px 6px;
  border-radius: 4px;
}

/* ---------- Footer ---------- */
.site-footer {
  text-align: center;
  padding: 24px 20px 40px;
  font-size: 0.82rem;
  color: var(--text-soft);
}

/* ---------- Responsive ---------- */
@media (max-width: 600px) {
  .logo { font-size: 1.9rem; }
  .tagline { font-size: 0.95rem; }
  .intro { margin-top: -28px; padding: 18px 18px; }
  .grid { grid-template-columns: 1fr; }
}