:root {
  --bg: #0a0e17;
  --bg-soft: #111827;
  --panel: #0f1524;
  --border: #1f2a3f;
  --text: #e5e9f0;
  --muted: #8b96a8;
  --accent: #22d3ee;
  --accent2: #a855f7;
  --green: #34d399;
  --yellow: #fbbf24;
  --red: #f87171;
}

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

html {
  scroll-behavior: smooth;
}

body {
  font-family: "SF Mono", "JetBrains Mono", Menlo, Consolas, "Courier New",
    monospace;
  background: var(--bg);
  color: var(--text);
  line-height: 1.6;
  overflow-x: hidden;
}

/* 背景网格 */
.bg-grid {
  position: fixed;
  inset: 0;
  z-index: -1;
  background-image: linear-gradient(rgba(34, 211, 238, 0.05) 1px, transparent 1px),
    linear-gradient(90deg, rgba(34, 211, 238, 0.05) 1px, transparent 1px);
  background-size: 42px 42px;
  mask-image: radial-gradient(ellipse 80% 60% at 50% 0%, #000 40%, transparent 100%);
}

.accent {
  color: var(--accent);
  text-shadow: 0 0 18px rgba(34, 211, 238, 0.5);
}

/* ===== 导航栏 ===== */
.nav {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  z-index: 100;
  background: rgba(10, 14, 23, 0.8);
  backdrop-filter: blur(12px);
  border-bottom: 1px solid var(--border);
}

.nav-inner {
  max-width: 1080px;
  margin: 0 auto;
  padding: 16px 24px;
  display: flex;
  align-items: center;
  justify-content: space-between;
}

.logo {
  font-size: 18px;
  font-weight: 700;
  color: var(--accent);
  text-decoration: none;
  letter-spacing: 0.5px;
}

.nav-links {
  display: flex;
  gap: 28px;
  align-items: center;
}

.nav-links a {
  color: var(--muted);
  text-decoration: none;
  font-size: 14px;
  transition: color 0.2s;
}

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

.nav-cta {
  border: 1px solid var(--accent);
  border-radius: 6px;
  padding: 6px 14px;
}

.nav-cta:hover {
  background: rgba(34, 211, 238, 0.12);
}

/* ===== Hero ===== */
.hero {
  min-height: 100vh;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  text-align: center;
  padding: 120px 24px 60px;
}

.hero-terminal {
  font-size: 15px;
  color: var(--muted);
  margin-bottom: 24px;
  letter-spacing: 1px;
}

.prompt {
  color: var(--green);
  font-weight: 700;
}

.cursor {
  color: var(--accent);
  animation: blink 1s step-end infinite;
}

@keyframes blink {
  50% { opacity: 0; }
}

.hero-title {
  font-size: clamp(38px, 7vw, 64px);
  font-weight: 700;
  margin-bottom: 20px;
  line-height: 1.2;
}

.typed {
  display: block;
  margin-top: 12px;
  min-height: 1.2em;
  font-size: clamp(24px, 4vw, 38px);
  color: var(--accent2);
  text-shadow: 0 0 18px rgba(168, 85, 247, 0.4);
}

.hero-sub {
  color: var(--muted);
  font-size: 17px;
  max-width: 640px;
  margin-bottom: 28px;
}

.hero-badge {
  display: flex;
  flex-wrap: wrap;
  justify-content: center;
  gap: 12px;
  margin-bottom: 40px;
}

.badge {
  border: 1px solid var(--border);
  background: var(--panel);
  border-radius: 999px;
  padding: 6px 16px;
  font-size: 13px;
  color: var(--muted);
}

.badge:hover {
  color: var(--accent);
  border-color: var(--accent);
  box-shadow: 0 0 12px rgba(34, 211, 238, 0.35);
}

.btn-primary {
  display: inline-block;
  background: linear-gradient(135deg, var(--accent), var(--accent2));
  color: #06121a;
  font-weight: 700;
  font-size: 15px;
  text-decoration: none;
  padding: 14px 32px;
  border-radius: 8px;
  transition: transform 0.2s, box-shadow 0.2s;
  box-shadow: 0 4px 24px rgba(34, 211, 238, 0.25);
}

.btn-primary:hover {
  transform: translateY(-2px);
  box-shadow: 0 8px 32px rgba(34, 211, 238, 0.4);
}

/* ===== 通用区块 ===== */
main {
  max-width: 1080px;
  margin: 0 auto;
  padding: 0 24px;
}

.section-title {
  font-size: clamp(26px, 4vw, 36px);
  margin-bottom: 12px;
}

.section-sub {
  color: var(--muted);
  margin-bottom: 40px;
}

/* ===== 项目 ===== */
.projects {
  padding: 80px 0;
}

.filter-bar {
  display: flex;
  gap: 12px;
  margin-bottom: 36px;
  flex-wrap: wrap;
}

.filter-btn {
  background: var(--panel);
  border: 1px solid var(--border);
  color: var(--muted);
  font-family: inherit;
  font-size: 14px;
  padding: 8px 18px;
  border-radius: 6px;
  cursor: pointer;
  transition: all 0.2s;
}

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

.filter-btn.active {
  background: linear-gradient(135deg, var(--accent), var(--accent2));
  color: #06121a;
  font-weight: 700;
  border-color: transparent;
}

.project-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(320px, 1fr));
  gap: 24px;
}

.project-card {
  background: var(--panel);
  border: 1px solid var(--border);
  border-radius: 10px;
  padding: 20px;
  transition: transform 0.25s, border-color 0.25s, box-shadow 0.25s;
  animation: fadeUp 0.4s ease both;
}

.project-card:hover {
  transform: translateY(-4px);
  border-color: var(--accent);
  box-shadow: 0 8px 32px rgba(34, 211, 238, 0.15);
}

@keyframes fadeUp {
  from { opacity: 0; transform: translateY(12px); }
  to { opacity: 1; transform: translateY(0); }
}

.card-head {
  display: flex;
  align-items: center;
  gap: 6px;
  margin-bottom: 14px;
}

.card-dot {
  width: 11px;
  height: 11px;
  border-radius: 50%;
}

.dot-red { background: var(--red); }
.dot-yellow { background: var(--yellow); }
.dot-green { background: var(--green); }

.card-title {
  margin-left: 8px;
  font-size: 13px;
  color: var(--muted);
}

.project-card h3 {
  font-size: 18px;
  margin-bottom: 10px;
}

.project-card p {
  color: var(--muted);
  font-size: 14px;
  margin-bottom: 16px;
  min-height: 44px;
}

.card-meta {
  display: flex;
  align-items: center;
  gap: 10px;
}

.tag {
  font-size: 12px;
  color: var(--accent);
  border: 1px solid rgba(34, 211, 238, 0.35);
  background: rgba(34, 211, 238, 0.08);
  padding: 3px 10px;
  border-radius: 4px;
}

.card-link {
  margin-left: auto;
  color: var(--muted);
  font-size: 13px;
  text-decoration: none;
  transition: color 0.2s;
}

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

.hidden {
  display: none;
}

/* ===== 关于我 ===== */
.about {
  padding: 80px 0;
}

.about-text {
  color: var(--muted);
  max-width: 720px;
  font-size: 15px;
  margin-bottom: 40px;
}

.stats {
  display: flex;
  gap: 40px;
  flex-wrap: wrap;
}

.stat {
  border: 1px solid var(--border);
  background: var(--panel);
  border-radius: 10px;
  padding: 20px 36px;
  text-align: center;
}

.stat-num {
  display: block;
  font-size: 30px;
  font-weight: 700;
  color: var(--accent);
  text-shadow: 0 0 16px rgba(34, 211, 238, 0.4);
}

.stat-label {
  display: block;
  color: var(--muted);
  font-size: 13px;
  margin-top: 4px;
}

/* ===== 联系 ===== */
.contact {
  padding: 80px 0;
  text-align: center;
}

.contact-sub {
  color: var(--muted);
  margin-bottom: 36px;
}

.contact-links {
  display: flex;
  justify-content: center;
  gap: 20px;
  flex-wrap: wrap;
}

.contact-item {
  display: inline-block;
  border: 1px solid var(--border);
  background: var(--panel);
  color: var(--text);
  text-decoration: none;
  padding: 12px 24px;
  border-radius: 8px;
  transition: all 0.2s;
}

.contact-item:hover {
  border-color: var(--accent2);
  color: var(--accent2);
  box-shadow: 0 0 16px rgba(168, 85, 247, 0.3);
  transform: translateY(-2px);
}

/* ===== 页脚 ===== */
.footer {
  border-top: 1px solid var(--border);
  padding: 28px 24px;
  text-align: center;
  color: var(--muted);
  font-size: 13px;
}

/* ===== 响应式 ===== */
@media (max-width: 640px) {
  .nav-links {
    gap: 16px;
  }
  .stats {
    gap: 16px;
  }
  .stat {
    padding: 16px 24px;
  }
  .project-grid {
    grid-template-columns: 1fr;
  }
}