:root {
  --bg: #0f1115;
  --bg-alt: #161922;
  --surface: #1a1e29;
  --border: #262b38;
  --text: #e8eaf0;
  --text-muted: #9aa3b2;
  --accent: #4ade80;
  --accent-soft: rgba(74, 222, 128, 0.12);
  --radius: 14px;
}

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

html {
  scroll-behavior: smooth;
}

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

.container {
  max-width: 960px;
  margin: 0 auto;
  padding: 0 24px;
}

a {
  color: var(--text);
  text-decoration: none;
}

.background-glow {
  position: fixed;
  top: -20%;
  left: 50%;
  transform: translateX(-50%);
  width: 80vw;
  height: 60vh;
  background: radial-gradient(ellipse at center, rgba(74, 222, 128, 0.1), transparent 65%);
  pointer-events: none;
  z-index: 0;
}

/* ===== Header ===== */
.site-header {
  position: sticky;
  top: 0;
  z-index: 100;
  background: rgba(15, 17, 21, 0.8);
  backdrop-filter: blur(12px);
  border-bottom: 1px solid var(--border);
}

.nav {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 64px;
}

.logo {
  font-weight: 800;
  letter-spacing: 0.5px;
}

.logo:hover {
  color: var(--accent);
}

.nav-links {
  display: flex;
  list-style: none;
  gap: 28px;
}

.nav-links a {
  color: var(--text-muted);
  font-size: 14px;
  font-weight: 500;
  transition: color 0.2s;
}

.nav-links a:hover {
  color: var(--text);
}

/* ===== Hero ===== */
.hero {
  position: relative;
  z-index: 1;
  padding: 96px 0 64px;
}

.hero-inner {
  display: flex;
  flex-direction: column;
  align-items: center;
  text-align: center;
}

.avatar {
  width: 120px;
  height: 120px;
  border-radius: 50%;
  border: 3px solid var(--accent);
  margin-bottom: 24px;
  box-shadow: 0 0 40px rgba(74, 222, 128, 0.2);
}

.hero-greeting {
  color: var(--text-muted);
  font-size: 16px;
  margin-bottom: 8px;
}

.hero-name {
  font-size: 48px;
  font-weight: 800;
  letter-spacing: -1px;
  background: linear-gradient(120deg, var(--text) 30%, var(--accent));
  -webkit-background-clip: text;
  background-clip: text;
  -webkit-text-fill-color: transparent;
  margin-bottom: 12px;
}

.hero-tagline {
  color: var(--text-muted);
  font-size: 18px;
  margin-bottom: 32px;
}

.hero-actions {
  display: flex;
  gap: 16px;
  margin-bottom: 56px;
}

.btn {
  display: inline-block;
  padding: 12px 28px;
  border-radius: 999px;
  font-weight: 600;
  font-size: 15px;
  transition: all 0.2s;
}

.btn-primary {
  background: var(--accent);
  color: #0b0f0c;
}

.btn-primary:hover {
  transform: translateY(-2px);
  box-shadow: 0 8px 24px rgba(74, 222, 128, 0.35);
}

.btn-ghost {
  border: 1px solid var(--border);
  color: var(--text);
}

.btn-ghost:hover {
  border-color: var(--accent);
  color: var(--accent);
}

.hero-stats {
  display: flex;
  list-style: none;
  gap: 48px;
}

.hero-stats li {
  display: flex;
  flex-direction: column;
  align-items: center;
}

.hero-stats strong {
  font-size: 28px;
  font-weight: 800;
  color: var(--accent);
}

.hero-stats span {
  font-size: 13px;
  color: var(--text-muted);
}

/* ===== Sections ===== */
.section {
  position: relative;
  z-index: 1;
  padding: 72px 0;
}

.section-alt {
  background: var(--bg-alt);
  border-top: 1px solid var(--border);
  border-bottom: 1px solid var(--border);
}

.section-title {
  font-size: 32px;
  font-weight: 800;
  text-align: center;
  margin-bottom: 8px;
}

.section-subtitle {
  text-align: center;
  color: var(--text-muted);
  margin-bottom: 40px;
}

/* ===== About ===== */
.about-content {
  max-width: 640px;
  margin: 0 auto;
  text-align: center;
  color: var(--text-muted);
}

.about-tags {
  display: flex;
  flex-wrap: wrap;
  justify-content: center;
  gap: 10px;
  list-style: none;
  margin-top: 24px;
}

.about-tags li {
  padding: 6px 16px;
  border-radius: 999px;
  background: var(--surface);
  border: 1px solid var(--border);
  font-size: 13px;
  font-weight: 500;
  color: var(--text);
  transition: all 0.2s;
}

.about-tags li:hover {
  border-color: var(--accent);
  color: var(--accent);
}

/* ===== Projects ===== */
.project-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(280px, 1fr));
  gap: 20px;
}

.project-card {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 24px;
  transition: all 0.25s;
}

.project-card:hover {
  transform: translateY(-4px);
  border-color: var(--accent);
  box-shadow: 0 12px 32px rgba(0, 0, 0, 0.3);
}

.project-card h3 {
  font-size: 18px;
  font-weight: 700;
  margin-bottom: 8px;
}

.project-card p {
  color: var(--text-muted);
  font-size: 14px;
  margin-bottom: 16px;
}

.project-tags {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
}

.project-tags span {
  font-size: 12px;
  color: var(--accent);
  background: var(--accent-soft);
  padding: 3px 10px;
  border-radius: 999px;
}

/* ===== Contact ===== */
.contact-links {
  display: flex;
  flex-direction: column;
  gap: 16px;
  max-width: 480px;
  margin: 0 auto;
}

.contact-item {
  display: flex;
  align-items: center;
  gap: 16px;
  padding: 18px 24px;
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  transition: all 0.2s;
}

.contact-item:hover {
  border-color: var(--accent);
  transform: translateX(4px);
}

.contact-icon {
  font-size: 12px;
  font-weight: 700;
  padding: 6px 12px;
  border-radius: 8px;
  background: var(--accent-soft);
  color: var(--accent);
}

.contact-label {
  color: var(--text-muted);
  font-size: 14px;
  word-break: break-all;
}

/* ===== Footer ===== */
.site-footer {
  border-top: 1px solid var(--border);
  padding: 32px 0;
  text-align: center;
  color: var(--text-muted);
  font-size: 14px;
}

/* ===== Responsive ===== */
@media (max-width: 640px) {
  .hero-name {
    font-size: 34px;
  }

  .hero-stats {
    gap: 28px;
  }

  .hero {
    padding: 64px 0 48px;
  }

  .nav-links {
    gap: 18px;
  }
}

/* ===== Reveal animation ===== */
.reveal {
  opacity: 0;
  transform: translateY(20px);
  transition: opacity 0.6s ease, transform 0.6s ease;
}

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