/* ========== 颜色变量：浅色模式 ========== */
:root {
  --bg: #f7f7fb;
  --text: #1c1d22;
  --muted: #5d6170;
  --card: rgba(255, 255, 255, 0.72);
  --border: rgba(20, 20, 40, 0.08);
  --accent: #f38020;          /* Cloudflare 橙 */
  --accent-2: #7c5cff;        /* 紫色，用于渐变 */
  --shadow: 0 8px 30px rgba(30, 30, 60, 0.08);
  --radius: 18px;
  --font: -apple-system, BlinkMacSystemFont, "Segoe UI", "PingFang SC",
          "Hiragino Sans GB", "Microsoft YaHei", "Noto Sans CJK SC",
          "Source Han Sans SC", "Helvetica Neue", Arial, sans-serif;
}

/* ========== 深色模式：跟随系统设置自动切换 ========== */
@media (prefers-color-scheme: dark) {
  :root {
    --bg: #0d0e14;
    --text: #ecedf3;
    --muted: #9aa0b4;
    --card: rgba(255, 255, 255, 0.045);
    --border: rgba(255, 255, 255, 0.09);
    --shadow: 0 8px 30px rgba(0, 0, 0, 0.35);
  }
}

* { box-sizing: border-box; margin: 0; padding: 0; }
html { scroll-behavior: smooth; }

body {
  font-family: var(--font);
  background: var(--bg);
  color: var(--text);
  line-height: 1.75;
  -webkit-font-smoothing: antialiased;
  min-height: 100vh;
}

/* 背景上淡淡的彩色光晕 */
.bg {
  position: fixed;
  inset: 0;
  z-index: -1;
  background:
    radial-gradient(600px circle at 12% 8%, color-mix(in srgb, var(--accent) 22%, transparent), transparent 60%),
    radial-gradient(700px circle at 88% 18%, color-mix(in srgb, var(--accent-2) 20%, transparent), transparent 60%);
  pointer-events: none;
}

a { color: inherit; text-decoration: none; }

/* ========== 顶部导航 ========== */
.nav {
  position: sticky;
  top: 0;
  z-index: 10;
  display: flex;
  justify-content: space-between;
  align-items: center;
  max-width: 960px;
  margin: 0 auto;
  padding: 16px 24px;
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
}
.brand { font-weight: 700; font-size: 1.1rem; letter-spacing: 0.02em; }
.nav nav { display: flex; gap: 22px; }
.nav nav a { color: var(--muted); font-size: 0.95rem; transition: color .2s; }
.nav nav a:hover { color: var(--text); }

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

/* ========== 首屏 ========== */
.hero {
  text-align: center;
  padding: 72px 0 64px;
}
.avatar {
  width: 88px; height: 88px;
  margin: 0 auto 24px;
  border-radius: 50%;
  display: grid; place-items: center;
  font-size: 2.2rem; font-weight: 800; color: #fff;
  background: linear-gradient(135deg, var(--accent), var(--accent-2));
  box-shadow: 0 10px 30px color-mix(in srgb, var(--accent-2) 35%, transparent);
}
.eyebrow { color: var(--muted); font-size: 1rem; }
.hero h1 {
  font-size: clamp(3rem, 9vw, 5.2rem);
  line-height: 1.1;
  font-weight: 800;
  letter-spacing: -0.02em;
  margin: 6px 0 14px;
  background: linear-gradient(120deg, var(--accent), var(--accent-2));
  -webkit-background-clip: text;
  background-clip: text;
  color: transparent;
}
.tagline { font-size: clamp(1.05rem, 2.6vw, 1.3rem); color: var(--muted); }
.hero-actions { margin-top: 32px; display: flex; gap: 12px; justify-content: center; flex-wrap: wrap; }

.btn {
  padding: 11px 22px;
  border-radius: 999px;
  font-weight: 600;
  font-size: 0.95rem;
  transition: transform .2s, box-shadow .2s, background .2s;
}
.btn:hover { transform: translateY(-2px); }
.btn.primary {
  color: #fff;
  background: linear-gradient(120deg, var(--accent), var(--accent-2));
  box-shadow: 0 8px 22px color-mix(in srgb, var(--accent) 30%, transparent);
}
.btn.ghost { border: 1px solid var(--border); background: var(--card); }

/* ========== 通用区块 ========== */
.section { padding: 40px 0; }
.section h2 {
  font-size: 1.5rem;
  margin-bottom: 20px;
  display: flex; align-items: baseline; gap: 12px;
}
.num {
  font-size: 0.85rem;
  font-weight: 700;
  color: var(--accent);
  font-variant-numeric: tabular-nums;
}

.card {
  background: var(--card);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 24px;
  box-shadow: var(--shadow);
  backdrop-filter: blur(8px);
  -webkit-backdrop-filter: blur(8px);
}
.card h3 { font-size: 1.12rem; margin-bottom: 6px; }
.card p { color: var(--muted); }

.grid { display: grid; gap: 18px; grid-template-columns: repeat(3, 1fr); }
.grid.two { grid-template-columns: repeat(2, 1fr); }

.feature { transition: transform .25s, border-color .25s; }
.feature:hover { transform: translateY(-4px); border-color: color-mix(in srgb, var(--accent) 45%, transparent); }
.icon { font-size: 1.6rem; margin-bottom: 10px; }

.tags { list-style: none; display: flex; flex-wrap: wrap; gap: 8px; margin-top: 16px; }
.tags li {
  font-size: 0.85rem;
  padding: 4px 12px;
  border-radius: 999px;
  border: 1px solid var(--border);
  color: var(--muted);
}

.project { position: relative; }
.project.dashed { border-style: dashed; box-shadow: none; }
.badge {
  display: inline-block;
  font-size: 0.75rem;
  font-weight: 600;
  padding: 2px 10px;
  border-radius: 999px;
  margin-bottom: 10px;
  color: #fff;
  background: var(--accent);
}
.badge.muted { background: transparent; color: var(--muted); border: 1px solid var(--border); }
.meta { margin-top: 12px; font-size: 0.85rem; opacity: 0.8; }

.contact p { color: var(--text); }
.contact p + p { margin-top: 6px; }

/* 待补充的占位文字，用虚线下划线标出来，方便找到要改的地方 */
.placeholder {
  color: var(--muted);
  font-style: italic;
  border-bottom: 1px dashed var(--muted);
}

/* ========== 页脚 ========== */
.footer {
  text-align: center;
  color: var(--muted);
  font-size: 0.85rem;
  padding: 48px 24px 40px;
}

/* ========== 手机屏幕适配 ========== */
@media (max-width: 720px) {
  .grid, .grid.two { grid-template-columns: 1fr; }
  .nav { padding: 14px 18px; }
  .nav nav { gap: 14px; }
  .nav nav a { font-size: 0.88rem; }
  main { padding: 0 18px; }
  .hero { padding: 48px 0 40px; }
}
@media (max-width: 420px) {
  .nav nav a:nth-child(2) { display: none; } /* 屏幕太窄时隐藏一个导航项 */
}