:root {
  --bg: #f7f8fb;
  --bg-alt: #eef1f8;
  --ink: #1f2430;
  --ink-soft: #5b6472;
  --accent: #4f46e5;
  --accent-2: #0ea5e9;
  --card: #ffffff;
  --shadow: 0 8px 28px rgba(31, 36, 48, 0.08);
  --radius: 16px;
}

* { box-sizing: border-box; }

html { scroll-behavior: smooth; }

body {
  margin: 0;
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", "PingFang SC",
    "Microsoft YaHei", "Hiragino Sans GB", sans-serif;
  color: var(--ink);
  background: var(--bg);
  line-height: 1.7;
}

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

/* ---------- Nav ---------- */
.nav {
  position: sticky;
  top: 0;
  z-index: 10;
  background: rgba(247, 248, 251, 0.85);
  backdrop-filter: blur(10px);
  border-bottom: 1px solid #e7e9f0;
}
.nav-inner {
  max-width: 960px;
  margin: 0 auto;
  padding: 14px 20px;
  display: flex;
  align-items: center;
  justify-content: space-between;
}
.brand {
  font-weight: 700;
  font-size: 18px;
  display: flex;
  align-items: center;
  gap: 8px;
}
.brand-dot {
  width: 12px; height: 12px;
  border-radius: 4px;
  background: linear-gradient(135deg, var(--accent), var(--accent-2));
  display: inline-block;
}
.nav-links a {
  margin-left: 22px;
  color: var(--ink-soft);
  font-size: 15px;
  transition: color .2s;
}
.nav-links a:hover { color: var(--accent); }

/* ---------- Hero ---------- */
.hero {
  background: linear-gradient(135deg, #eef2ff 0%, #e0f2fe 100%);
  padding: 80px 20px 70px;
}
.hero-inner {
  max-width: 760px;
  margin: 0 auto;
  text-align: center;
}
.hero h1 {
  font-size: 44px;
  margin: 0 0 14px;
  letter-spacing: 1px;
}
.hero-sub {
  font-size: 19px;
  color: var(--ink-soft);
  margin: 0 0 8px;
}
.hero-by {
  font-size: 14px;
  color: #8a93a6;
  margin: 0 0 26px;
}
.hero-cta {
  display: inline-block;
  padding: 12px 26px;
  border-radius: 999px;
  background: var(--accent);
  color: #fff;
  font-weight: 600;
  transition: transform .15s, box-shadow .15s;
  box-shadow: 0 6px 18px rgba(79, 70, 229, .35);
}
.hero-cta:hover { transform: translateY(-2px); box-shadow: 0 10px 24px rgba(79, 70, 229, .45); }

/* ---------- Sections ---------- */
.section {
  max-width: 960px;
  margin: 0 auto;
  padding: 56px 20px;
}
.section-alt { background: var(--bg-alt); max-width: none; }
.section-alt > * { max-width: 960px; margin-left: auto; margin-right: auto; }
.section-title {
  font-size: 26px;
  margin: 0 0 28px;
  position: relative;
  padding-left: 14px;
}
.section-title::before {
  content: "";
  position: absolute;
  left: 0; top: 6px; bottom: 6px;
  width: 5px; border-radius: 3px;
  background: linear-gradient(var(--accent), var(--accent-2));
}

/* ---------- Cards ---------- */
.cards {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(240px, 1fr));
  gap: 20px;
}
.card {
  background: var(--card);
  border-radius: var(--radius);
  padding: 26px 22px;
  box-shadow: var(--shadow);
  transition: transform .18s, box-shadow .18s;
}
.card:hover { transform: translateY(-4px); box-shadow: 0 14px 34px rgba(31,36,48,.12); }
.card-icon { font-size: 30px; margin-bottom: 10px; }
.card h3 { margin: 0 0 6px; font-size: 19px; }
.card-tag {
  display: inline-block;
  font-size: 12px;
  color: var(--accent);
  background: #eef0ff;
  padding: 2px 10px;
  border-radius: 999px;
  margin: 0 0 12px;
}
.card-desc { margin: 0; color: var(--ink-soft); font-size: 15px; }

/* ---------- About / Contact ---------- */
.about p, .contact p { color: var(--ink-soft); margin: 0 0 14px; }
.contact-list { list-style: none; padding: 0; margin: 0 0 8px; }
.contact-list li { padding: 6px 0; font-size: 16px; }
.contact-list a { color: var(--accent); font-weight: 600; }
.copyable { font-weight: 600; color: var(--ink); }
.copy-btn {
  margin-left: 8px;
  border: 1px solid #d6d9e3;
  background: #fff;
  color: var(--ink-soft);
  border-radius: 8px;
  padding: 2px 10px;
  font-size: 13px;
  cursor: pointer;
  transition: all .15s;
}
.copy-btn:hover { border-color: var(--accent); color: var(--accent); }
.contact-note { font-size: 13px; color: #98a0b0; }

/* ---------- Footer ---------- */
.footer {
  text-align: center;
  padding: 30px 20px 40px;
  border-top: 1px solid #e7e9f0;
  background: #fff;
}
.beian { display: flex; gap: 18px; justify-content: center; flex-wrap: wrap; }
.beian a {
  font-size: 13px;
  color: var(--ink-soft);
  border-bottom: 1px dashed #c8cdd9;
  padding-bottom: 1px;
}
.beian a:hover { color: var(--accent); border-color: var(--accent); }
.copyright { font-size: 13px; color: #aab0bd; margin: 14px 0 0; }
.visit { font-size: 13px; color: #aab0bd; margin: 6px 0 0; }
.visit #visitCount { color: var(--accent); font-weight: 600; }

/* ---------- 下载列表（download.html） ---------- */
.dl-toolbar { display: flex; align-items: center; gap: 12px; margin-bottom: 18px; flex-wrap: wrap; }
.dl-hint { font-size: 14px; color: var(--ink-soft); }
.dl-list { display: grid; gap: 14px; }
.dl-row {
  display: flex; align-items: center; gap: 16px;
  background: var(--card); border: 1px solid #eef0f6; border-radius: var(--radius);
  padding: 16px 20px; box-shadow: var(--shadow);
  transition: transform .15s ease, box-shadow .15s ease;
}
.dl-row:hover { transform: translateY(-2px); box-shadow: 0 12px 32px rgba(31,36,48,.12); }
.dl-icon { font-size: 30px; line-height: 1; flex: 0 0 auto; }
.dl-main { flex: 1 1 auto; min-width: 0; }
.dl-name { font-size: 17px; font-weight: 600; color: var(--ink); word-break: break-all; }
.dl-meta { margin-top: 4px; font-size: 13px; color: var(--ink-soft); display: flex; gap: 14px; flex-wrap: wrap; }
.dl-tag {
  display: inline-block; font-size: 12px; padding: 1px 9px; border-radius: 999px;
  background: #eef2ff; color: var(--accent); margin-right: 8px; vertical-align: middle;
}
.dl-btn {
  flex: 0 0 auto; text-decoration: none; white-space: nowrap;
  background: var(--accent); color: #fff; font-size: 14px; font-weight: 600;
  padding: 10px 20px; border-radius: 10px; transition: background .15s ease;
}
.dl-btn:hover { background: #4338ca; }
.dl-empty, .dl-loading { text-align: center; color: var(--ink-soft); padding: 40px 0; font-size: 15px; }

/* ---------- Toast ---------- */
.toast {
  position: fixed;
  left: 50%; bottom: 36px;
  transform: translateX(-50%);
  background: #1f2430;
  color: #fff;
  padding: 10px 20px;
  border-radius: 10px;
  font-size: 14px;
  box-shadow: 0 8px 24px rgba(0,0,0,.25);
  animation: fade .3s ease;
}
@keyframes fade { from { opacity: 0; transform: translate(-50%, 8px); } to { opacity: 1; transform: translate(-50%, 0); } }

@media (max-width: 600px) {
  .hero h1 { font-size: 34px; }
  .hero-sub { font-size: 17px; }
  .section { padding: 40px 18px; }
}