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

:root {
  --bg: #fafafa;
  --text: #1a1a1a;
  --text-light: #6b7280;
  --accent: #4f46e5;
  --card: #ffffff;
  --border: #e5e7eb;
  --radius: 16px;
  --shadow: 0 1px 3px rgba(0, 0, 0, 0.06), 0 8px 24px rgba(0, 0, 0, 0.05);
}

html {
  scroll-behavior: smooth;
}

body {
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", "PingFang SC",
    "Hiragino Sans GB", "Microsoft YaHei", "Helvetica Neue", Arial, sans-serif;
  background: var(--bg);
  color: var(--text);
  line-height: 1.7;
  min-height: 100vh;
  display: flex;
  flex-direction: column;
}

/* ===== Hero ===== */
.hero {
  min-height: 92vh;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  text-align: center;
  padding: 3rem 1.5rem;
  background: linear-gradient(180deg, #ffffff 0%, var(--bg) 100%);
}

.avatar {
  width: 112px;
  height: 112px;
  border-radius: 50%;
  background: linear-gradient(135deg, var(--accent) 0%, #7c3aed 100%);
  display: flex;
  align-items: center;
  justify-content: center;
  margin-bottom: 1.5rem;
  box-shadow: 0 12px 32px rgba(79, 70, 229, 0.35);
  animation: float 4s ease-in-out infinite;
}

.avatar-letter {
  color: #fff;
  font-size: 3rem;
  font-weight: 700;
}

.name {
  font-size: clamp(2.2rem, 6vw, 3.5rem);
  font-weight: 700;
  letter-spacing: 0.02em;
}

.tagline {
  margin-top: 0.75rem;
  font-size: clamp(1rem, 2.5vw, 1.25rem);
  color: var(--text-light);
}

.scroll-hint {
  position: absolute;
  bottom: 2.5rem;
  left: 50%;
  transform: translateX(-50%);
  width: 24px;
  height: 38px;
  border: 2px solid var(--text-light);
  border-radius: 12px;
  display: flex;
  justify-content: center;
  padding-top: 6px;
}

.scroll-hint span {
  width: 4px;
  height: 8px;
  background: var(--text-light);
  border-radius: 2px;
  animation: scroll 1.6s ease-in-out infinite;
}

@keyframes scroll {
  0%, 100% { transform: translateY(0); opacity: 1; }
  50% { transform: translateY(10px); opacity: 0.2; }
}

@keyframes float {
  0%, 100% { transform: translateY(0); }
  50% { transform: translateY(-8px); }
}

/* ===== Content ===== */
.content {
  width: 100%;
  max-width: 760px;
  margin: 0 auto;
  padding: 0 1.5rem 4rem;
  flex: 1;
}

.card {
  background: var(--card);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  box-shadow: var(--shadow);
  padding: 2rem;
}

.intro h2 {
  font-size: 1.4rem;
  margin-bottom: 1rem;
  position: relative;
  padding-left: 0.9rem;
}

.intro h2::before {
  content: "";
  position: absolute;
  left: 0;
  top: 0.25rem;
  bottom: 0.25rem;
  width: 4px;
  border-radius: 2px;
  background: var(--accent);
}

.intro p {
  color: #374151;
  margin-bottom: 0.75rem;
}

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

/* ===== Facts ===== */
.facts {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 1rem;
  margin-top: 1.5rem;
}

.fact-card {
  background: var(--card);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 1.25rem;
  text-align: center;
  box-shadow: var(--shadow);
  transition: transform 0.2s ease, box-shadow 0.2s ease;
}

.fact-card:hover {
  transform: translateY(-4px);
  box-shadow: 0 12px 28px rgba(0, 0, 0, 0.1);
}

.fact-card h3 {
  font-size: 0.85rem;
  font-weight: 600;
  color: var(--text-light);
  margin-bottom: 0.35rem;
}

.fact-card p {
  font-size: 1.05rem;
  font-weight: 600;
}

/* ===== Footer ===== */
.footer {
  text-align: center;
  padding: 2rem 1.5rem;
  color: var(--text-light);
  font-size: 0.9rem;
}

/* ===== Reveal on scroll ===== */
.reveal {
  opacity: 0;
  transform: translateY(24px);
  transition: opacity 0.6s ease, transform 0.6s ease;
}

.reveal.visible {
  opacity: 1;
  transform: translateY(0);
}

/* ===== Responsive ===== */
@media (max-width: 640px) {
  .facts {
    grid-template-columns: 1fr;
  }

  .card {
    padding: 1.5rem;
  }
}