/* ============ 开发者小站 - 主题变量 ============ */
:root {
  --bg: #f6f7fb;
  --bg-elev: #ffffff;
  --bg-soft: #f0f2f8;
  --text: #1c2033;
  --text-soft: #5b6480;
  --text-mute: #8b93ab;
  --border: #e5e8f0;
  --primary: #3b5bfd;
  --primary-soft: rgba(59, 91, 253, .1);
  --accent: #ff6b4a;
  --radius: 14px;
  --radius-sm: 9px;
  --shadow-sm: 0 1px 3px rgba(24, 32, 60, .06);
  --shadow: 0 6px 24px rgba(24, 32, 60, .08);
  --shadow-lg: 0 18px 48px rgba(24, 32, 60, .14);
  --header-h: 66px;
  --maxw: 1200px;
}
html[data-theme="dark"] {
  --bg: #0e1120;
  --bg-elev: #171b2e;
  --bg-soft: #1e2338;
  --text: #e8ebf5;
  --text-soft: #a3abc4;
  --text-mute: #737d9a;
  --border: #272d47;
  --primary: #6b86ff;
  --primary-soft: rgba(107, 134, 255, .16);
  --shadow-sm: 0 1px 3px rgba(0, 0, 0, .3);
  --shadow: 0 6px 24px rgba(0, 0, 0, .35);
  --shadow-lg: 0 18px 48px rgba(0, 0, 0, .5);
}

* { box-sizing: border-box; }
html { scroll-behavior: smooth; }
body {
  margin: 0;
  background: var(--bg);
  color: var(--text);
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", "PingFang SC",
               "Hiragino Sans GB", "Microsoft YaHei", "Helvetica Neue", Arial, sans-serif;
  font-size: 15px;
  line-height: 1.75;
  -webkit-font-smoothing: antialiased;
  transition: background .25s, color .25s;
}
a { color: inherit; text-decoration: none; }
ul { margin: 0; padding: 0; list-style: none; }
h1, h2, h3, h4, h5 { margin: 0; line-height: 1.35; font-weight: 700; }
p { margin: 0; }
img, svg { display: block; max-width: 100%; }
.container { width: 100%; max-width: var(--maxw); margin: 0 auto; padding: 0 22px; }
.icon { width: 18px; height: 18px; fill: none; stroke: currentColor; stroke-width: 1.9;
        stroke-linecap: round; stroke-linejoin: round; }

/* ============ Header ============ */
.site-header {
  position: sticky; top: 0; z-index: 60;
  height: var(--header-h);
  background: var(--bg-elev);
  background: color-mix(in srgb, var(--bg-elev) 88%, transparent);
  backdrop-filter: saturate(180%) blur(14px);
  border-bottom: 1px solid var(--border);
}
.header-inner { height: var(--header-h); display: flex; align-items: center; gap: 20px; }
.brand { display: flex; align-items: center; gap: 9px; font-weight: 800; font-size: 17px; letter-spacing: .3px; }
.brand-mark {
  display: grid; place-items: center;
  width: 30px; height: 30px; border-radius: 8px;
  background: linear-gradient(135deg, var(--primary), #8b5cf6);
  color: #fff; font-size: 12px; font-weight: 700;
}
.brand-text { position: relative; }
.brand-text::after {
  content: ""; position: absolute; right: -14px; top: 4px;
  width: 6px; height: 6px; border-radius: 50%; background: var(--accent);
}
.main-nav { display: flex; gap: 4px; margin-left: 12px; }
.nav-link {
  padding: 7px 13px; border-radius: 8px; font-size: 14.5px; color: var(--text-soft);
  transition: background .18s, color .18s;
}
.nav-link:hover { background: var(--bg-soft); color: var(--text); }
.nav-link.active { color: var(--primary); background: var(--primary-soft); font-weight: 600; }

.header-actions { margin-left: auto; display: flex; align-items: center; gap: 10px; }
.search-box {
  display: flex; align-items: center; gap: 7px;
  background: var(--bg-soft); border: 1px solid transparent;
  border-radius: 999px; padding: 7px 14px; min-width: 190px;
  transition: border-color .2s, background .2s;
}
.search-box:focus-within { border-color: var(--primary); background: var(--bg-elev); }
.search-box .icon { color: var(--text-mute); flex: none; }
.search-box input {
  border: 0; background: none; outline: none; width: 100%;
  font-size: 14px; color: var(--text); font-family: inherit;
}
.theme-toggle, .menu-toggle {
  display: grid; place-items: center;
  width: 36px; height: 36px; border-radius: 10px;
  background: var(--bg-soft); border: 1px solid var(--border);
  color: var(--text-soft); cursor: pointer; transition: color .18s, border-color .18s;
}
.theme-toggle:hover { color: var(--primary); border-color: var(--primary); }
.icon-moon { display: none; }
html[data-theme="dark"] .icon-sun { display: none; }
html[data-theme="dark"] .icon-moon { display: block; }
.menu-toggle { display: none; flex-direction: column; gap: 4px; }
.menu-toggle span { width: 16px; height: 2px; background: currentColor; border-radius: 2px; }

/* ============ Hero ============ */
.hero { position: relative; padding: 66px 0 54px; overflow: hidden; }
.hero-glow {
  position: absolute; inset: -40% -10% auto -10%; height: 620px;
  background:
    radial-gradient(46% 46% at 22% 30%, rgba(59, 91, 253, .16), transparent 70%),
    radial-gradient(40% 40% at 78% 18%, rgba(139, 92, 246, .14), transparent 70%),
    radial-gradient(34% 34% at 62% 74%, rgba(255, 107, 74, .1), transparent 70%);
  filter: blur(12px); pointer-events: none;
}
.hero-inner {
  position: relative;
  display: grid; grid-template-columns: 1.15fr .85fr; gap: 46px; align-items: center;
}
.badge {
  display: inline-flex; align-items: center; gap: 7px;
  background: var(--bg-elev); border: 1px solid var(--border);
  color: var(--text-soft); font-size: 13px; padding: 5px 13px; border-radius: 999px;
  box-shadow: var(--shadow-sm);
}
.badge .dot { width: 7px; height: 7px; border-radius: 50%; background: #22c55e;
  box-shadow: 0 0 0 3px rgba(34, 197, 94, .18); animation: pulse 2s infinite; }
@keyframes pulse { 50% { box-shadow: 0 0 0 6px rgba(34, 197, 94, 0); } }
.hero h1 { margin: 18px 0 14px; font-size: 44px; letter-spacing: -.5px; }
.hero h1::after {
  content: ""; display: block; width: 62px; height: 4px; margin-top: 18px;
  border-radius: 4px; background: linear-gradient(90deg, var(--primary), var(--accent));
}
.hero-desc { color: var(--text-soft); font-size: 16px; max-width: 560px; }
.hero-desc strong { color: var(--text); }
.hero-tags { display: flex; flex-wrap: wrap; gap: 8px; margin: 20px 0 24px; }
.tag {
  font-size: 12.5px; padding: 4px 11px; border-radius: 7px;
  background: var(--bg-soft); color: var(--text-soft); border: 1px solid var(--border);
}
.tag.mini { font-size: 11.5px; padding: 2px 8px; }
.btn {
  display: inline-flex; align-items: center; justify-content: center;
  padding: 11px 24px; border-radius: 10px; font-size: 15px; font-weight: 600;
  border: 1px solid transparent; cursor: pointer; transition: transform .16s, box-shadow .2s, background .2s;
}
.btn-primary { background: var(--primary); color: #fff; box-shadow: 0 8px 20px rgba(59, 91, 253, .28); }
.btn-primary:hover { transform: translateY(-2px); box-shadow: 0 14px 28px rgba(59, 91, 253, .34); }
.btn-ghost { background: var(--bg-elev); color: var(--text); border-color: var(--border); }
.btn-ghost:hover { border-color: var(--primary); color: var(--primary); }
.btn-outline { background: transparent; color: var(--text-soft); border-color: var(--border); }
.btn-outline:hover { color: var(--primary); border-color: var(--primary); }
.hero-stats { display: flex; gap: 34px; margin: 30px 0 0; padding: 0; }
.hero-stats li { display: flex; flex-direction: column; }
.hero-stats strong { font-size: 25px; font-weight: 800; letter-spacing: -.5px; }
.hero-stats span { font-size: 13px; color: var(--text-mute); }

.hero-card { display: flex; justify-content: center; }
.code-window {
  width: 100%; border-radius: var(--radius); overflow: hidden;
  background: #10142a; box-shadow: var(--shadow-lg);
  border: 1px solid rgba(255, 255, 255, .08);
}
.code-bar {
  display: flex; align-items: center; gap: 7px;
  padding: 11px 15px; background: #1a1f3d;
}
.c-dot { width: 10px; height: 10px; border-radius: 50%; }
.c-dot.red { background: #ff5f57; } .c-dot.yellow { background: #febc2e; } .c-dot.green { background: #28c840; }
.code-title { margin-left: auto; font-size: 12px; color: #7c85b1; letter-spacing: .5px; }
.code-body {
  margin: 0; padding: 20px 22px; overflow-x: auto;
  font-family: "JetBrains Mono", "Fira Code", Consolas, "Courier New", monospace;
  font-size: 13.5px; line-height: 1.85; color: #cfd6f5;
}
.code-body .k { color: #c792ea; } .code-body .p { color: #82aaff; }
.code-body .s { color: #c3e88d; } .code-body .v { color: #ffcb6b; }
.code-body .fn { color: #82aaff; }

/* ============ Layout ============ */
.layout {
  display: grid; grid-template-columns: 1fr 316px; gap: 34px;
  padding-top: 40px; padding-bottom: 56px; align-items: start;
}
.section-head { display: flex; align-items: center; justify-content: space-between; gap: 16px; flex-wrap: wrap; margin-bottom: 20px; }
.section-head h2 { font-size: 22px; position: relative; padding-left: 13px; }
.section-head h2::before {
  content: ""; position: absolute; left: 0; top: 50%; transform: translateY(-50%);
  width: 4px; height: 18px; border-radius: 3px; background: var(--primary);
}
.filter-bar { display: flex; gap: 7px; flex-wrap: wrap; }
.chip {
  border: 1px solid var(--border); background: var(--bg-elev); color: var(--text-soft);
  font-size: 13px; padding: 5px 13px; border-radius: 999px; cursor: pointer;
  transition: all .18s; font-family: inherit;
}
.chip:hover { border-color: var(--primary); color: var(--primary); }
.chip.active { background: var(--primary); border-color: var(--primary); color: #fff; }

/* 精选文章 */
.featured-card {
  display: grid; grid-template-columns: 300px 1fr; gap: 0;
  background: var(--bg-elev); border: 1px solid var(--border);
  border-radius: var(--radius); overflow: hidden; margin-bottom: 22px;
  box-shadow: var(--shadow-sm); transition: transform .2s, box-shadow .25s;
}
.featured-card:hover { transform: translateY(-3px); box-shadow: var(--shadow); }
.featured-cover {
  position: relative;
  background: linear-gradient(135deg, #3b5bfd, #8b5cf6 55%, #ff6b4a);
  display: grid; place-items: center;
}
.featured-cover span { color: rgba(255, 255, 255, .92); font-size: 13px; font-weight: 800; letter-spacing: 3px; }
.featured-body { padding: 24px 26px; }
.featured-body h3 { font-size: 20px; margin: 10px 0 10px; }
.featured-body h3 a:hover { color: var(--primary); }
.featured-body p { color: var(--text-soft); font-size: 14.5px; }
.meta { display: flex; align-items: center; gap: 10px; font-size: 12.5px; color: var(--text-mute); }
.cat {
  background: var(--primary-soft); color: var(--primary);
  padding: 2px 9px; border-radius: 6px; font-weight: 600;
}
.card-foot { display: flex; align-items: center; gap: 8px; margin-top: 16px; flex-wrap: wrap; }
.read-more { margin-left: auto; color: var(--primary); font-size: 14px; font-weight: 600; }
.read-more:hover { text-decoration: underline; }

/* 文章网格 */
.post-grid { display: grid; grid-template-columns: repeat(2, 1fr); gap: 20px; }
.post-card {
  background: var(--bg-elev); border: 1px solid var(--border);
  border-radius: var(--radius); padding: 20px 22px;
  display: flex; flex-direction: column; gap: 10px;
  box-shadow: var(--shadow-sm);
  transition: transform .2s, box-shadow .25s, border-color .2s;
  animation: fadeUp .4s both;
}
@keyframes fadeUp { from { opacity: 0; transform: translateY(10px); } }
.post-card:hover { transform: translateY(-3px); box-shadow: var(--shadow); border-color: var(--primary); }
.post-card h3 { font-size: 17px; }
.post-card h3 a:hover { color: var(--primary); }
.post-card p {
  color: var(--text-soft); font-size: 14px; flex: 1;
  display: -webkit-box; -webkit-line-clamp: 2; -webkit-box-orient: vertical; overflow: hidden;
}
.post-card .card-foot { margin-top: 4px; }
.empty-state { text-align: center; color: var(--text-mute); padding: 40px 0; }

/* ============ Sidebar ============ */
.sidebar { display: flex; flex-direction: column; gap: 20px; position: sticky; top: calc(var(--header-h) + 20px); }
.widget {
  background: var(--bg-elev); border: 1px solid var(--border);
  border-radius: var(--radius); padding: 22px; box-shadow: var(--shadow-sm);
}
.widget-title { font-size: 15px; margin-bottom: 14px; padding-left: 11px; position: relative; }
.widget-title::before {
  content: ""; position: absolute; left: 0; top: 50%; transform: translateY(-50%);
  width: 3px; height: 14px; border-radius: 3px; background: var(--accent);
}
.about-widget { text-align: center; }
.avatar {
  width: 66px; height: 66px; margin: 0 auto 12px; border-radius: 50%;
  display: grid; place-items: center; font-size: 26px; font-weight: 800; color: #fff;
  background: linear-gradient(135deg, var(--primary), #8b5cf6);
  box-shadow: 0 8px 20px rgba(59, 91, 253, .3);
}
.about-widget h4 { font-size: 17px; }
.about-desc {
  margin: 9px auto 0; max-width: 250px;
  font-size: 12.5px; line-height: 1.7; color: var(--text-mute);
}
.social { display: flex; justify-content: center; gap: 10px; margin-top: 14px; }
.social a {
  width: 34px; height: 34px; border-radius: 9px; display: grid; place-items: center;
  background: var(--bg-soft); color: var(--text-soft); transition: all .18s;
}
.social a:hover { background: var(--primary); color: #fff; transform: translateY(-2px); }
.social .icon { width: 16px; height: 16px; }
.social svg:last-child { fill: none; }
.cat-list li a, .archive-list li a {
  display: flex; align-items: center; justify-content: space-between;
  padding: 8px 4px; font-size: 14px; color: var(--text-soft);
  border-bottom: 1px dashed var(--border); transition: color .18s, padding-left .18s;
}
.cat-list li:last-child a, .archive-list li:last-child a { border-bottom: 0; }
.cat-list li a:hover, .archive-list li a:hover { color: var(--primary); padding-left: 9px; }
.cat-list em, .archive-list em { font-style: normal; font-size: 12.5px; color: var(--text-mute); }
.tag-cloud { display: flex; flex-wrap: wrap; gap: 7px; }
.tag-cloud .tag { cursor: default; transition: all .18s; }
.tag-cloud .tag:hover { background: var(--primary); color: #fff; border-color: var(--primary); }

/* ============ Footer ============ */
.site-footer { background: var(--bg-elev); border-top: 1px solid var(--border); }

.footer-bottom {
  padding: 24px 22px 28px;
  text-align: center; color: var(--text-mute); font-size: 13px;
}
.footer-bottom p { margin-bottom: 6px; }
.footer-contact a { color: var(--text-soft); transition: color .18s; }
.footer-contact a:hover { color: var(--primary); text-decoration: underline; }
.beian { display: flex; align-items: center; justify-content: center; gap: 8px; flex-wrap: wrap; }
.beian a { color: var(--text-soft); }
.beian a:hover { color: var(--primary); text-decoration: underline; }
.police-icon { display: inline-block; vertical-align: -2px; }
.hosting { font-size: 12.5px; color: var(--text-mute); }

/* ============ 回到顶部 ============ */
.back-to-top {
  position: fixed; right: 26px; bottom: 30px; z-index: 60;
  width: 42px; height: 42px; border-radius: 50%;
  background: var(--primary); color: #fff; border: 0; cursor: pointer;
  font-size: 18px; box-shadow: var(--shadow); opacity: 0; pointer-events: none;
  transition: opacity .25s, transform .2s;
}
.back-to-top.show { opacity: 1; pointer-events: auto; }
.back-to-top:hover { transform: translateY(-3px); }

/* ============ 响应式 ============ */
@media (max-width: 1024px) {
  .hero-inner { grid-template-columns: 1fr; }
  .hero-card { order: -1; max-width: 460px; }
  .layout { grid-template-columns: 1fr; }
  .sidebar { position: static; }
}
@media (max-width: 820px) {
  .main-nav {
    position: absolute; top: var(--header-h); left: 0; right: 0;
    flex-direction: column; gap: 2px; padding: 12px 22px;
    background: var(--bg-elev); border-bottom: 1px solid var(--border);
    box-shadow: var(--shadow); display: none;
  }
  .main-nav.open { display: flex; }
  .menu-toggle { display: flex; }
  .search-box { min-width: 0; width: 42px; padding: 7px 11px; }
  .search-box:focus-within { width: 200px; }
  .post-grid { grid-template-columns: 1fr; }
  .featured-card { grid-template-columns: 1fr; }
  .featured-cover { height: 130px; }
}
@media (max-width: 560px) {
  .hero { padding: 40px 0 34px; }
  .hero h1 { font-size: 31px; }
  .hero-stats { gap: 22px; }
  .hero-stats strong { font-size: 21px; }
}
@media (prefers-reduced-motion: reduce) {
  * { animation: none !important; transition: none !important; }
}