/* =========================================================
   样式表 style.css —— 玻璃拟态 · 淡雅高级紫
   说明：只负责"网站长什么样"，不碰内容结构。
   ========================================================= */

/* ---------- 1. 设计变量（CSS 变量）---------- */
:root {
  /* 极淡薰衣草渐变 + 柔光晕，整体提亮、降饱和 */
  --bg:
    radial-gradient(ellipse at 15% 10%, rgba(216, 200, 255, 0.55), transparent 45%),
    radial-gradient(ellipse at 85% 15%, rgba(255, 214, 235, 0.40), transparent 45%),
    radial-gradient(ellipse at 60% 95%, rgba(200, 220, 255, 0.45), transparent 50%),
    linear-gradient(160deg, #f7f4fd 0%, #f0ebfa 50%, #e9e2f7 100%);

  /* 通透白玻璃卡片 */
  --card-bg: rgba(255, 255, 255, 0.55);
  --card-border: rgba(255, 255, 255, 0.75);
  --glass-blur: blur(20px) saturate(140%);
  --glass-shadow: 0 8px 30px rgba(120, 100, 160, 0.18);

  --text: #3b3149;          /* 深烟紫灰，浅底上清晰 */
  --muted: #8d82a3;         /* 淡紫灰 */
  --accent: #8b6fd4;        /* 克制紫罗兰 */
  --max-width: 720px;
}

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

body {
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", "PingFang SC",
               "Microsoft YaHei", sans-serif;
  background: var(--bg);
  background-attachment: fixed;
  min-height: 100vh;
  color: var(--text);
  line-height: 1.7;
}
a { color: var(--accent); text-decoration: none; }
a:hover { text-decoration: underline; }

.container { max-width: var(--max-width); margin: 0 auto; padding: 0 20px; }

/* 页头：通透白玻璃吸顶 */
.site-header {
  background: var(--card-bg);
  -webkit-backdrop-filter: var(--glass-blur);
  backdrop-filter: var(--glass-blur);
  border-bottom: 1px solid var(--card-border);
  position: sticky; top: 0; z-index: 50;
}
.header-inner {
  display: flex; align-items: center; justify-content: space-between;
  flex-wrap: wrap; padding: 16px 20px;
}
.brand { display: flex; flex-direction: column; }
.site-title { color: var(--text); font-size: 22px; font-weight: 700; letter-spacing: 0.5px; }
.site-tagline { color: var(--muted); font-size: 13px; margin-top: 2px; }
.site-nav { display: flex; gap: 22px; align-items: center; }
.site-nav a { color: var(--text); font-size: 15px; }
.site-nav a:hover { color: var(--accent); }
.theme-toggle {
  font: inherit; font-size: 14px; color: var(--text);
  background: rgba(255, 255, 255, 0.55);
  -webkit-backdrop-filter: blur(10px); backdrop-filter: blur(10px);
  border: 1px solid var(--card-border);
  border-radius: 999px; padding: 5px 14px; cursor: pointer;
  transition: border-color 0.2s, color 0.2s;
}
.theme-toggle:hover { border-color: var(--accent); color: var(--accent); }

/* 主体 */
main.container { padding-top: 48px; padding-bottom: 64px; }
.intro { text-align: center; padding: 44px 0 32px; }
.intro h1 {
  font-size: 30px; margin-bottom: 10px;
  background: linear-gradient(90deg, #7c6bd1, #a78bfa, #c4a3ff);
  -webkit-background-clip: text; background-clip: text;
  -webkit-text-fill-color: transparent;
}
.intro p { color: var(--muted); margin-bottom: 8px; }

.post-list { list-style: none; }
.post-card {
  background: var(--card-bg);
  -webkit-backdrop-filter: var(--glass-blur); backdrop-filter: var(--glass-blur);
  border: 1px solid var(--card-border);
  border-radius: 16px; padding: 22px 26px; margin-bottom: 18px;
  box-shadow: var(--glass-shadow);
  transition: transform 0.25s ease, box-shadow 0.25s ease, border-color 0.25s ease;
}
.post-card:hover {
  transform: translateY(-4px);
  box-shadow: 0 14px 38px rgba(120, 100, 160, 0.26);
  border-color: rgba(139, 111, 212, 0.45);
}
.post-card time { color: var(--muted); font-size: 13px; }
.post-card h2 { font-size: 18px; margin: 6px 0; }
.post-card h2 a { color: var(--text); }
.post-card h2 a:hover { color: var(--accent); }
.post-card p { color: var(--muted); font-size: 15px; }

/* 页脚 */
.site-footer {
  border-top: 1px solid var(--card-border);
  padding: 28px 0; text-align: center;
  background: rgba(255, 255, 255, 0.30);
  -webkit-backdrop-filter: blur(10px); backdrop-filter: blur(10px);
}
.site-footer p { color: var(--muted); font-size: 13px; }

/* 文章页：通透白玻璃大卡 */
.post {
  background: var(--card-bg);
  -webkit-backdrop-filter: var(--glass-blur); backdrop-filter: var(--glass-blur);
  border: 1px solid var(--card-border);
  border-radius: 18px; padding: 34px 38px;
  box-shadow: var(--glass-shadow);
}
.post-header { margin-bottom: 24px; padding-bottom: 16px; border-bottom: 1px solid var(--card-border); }
.post-header time { color: var(--muted); font-size: 13px; }
.post-header h1 {
  font-size: 26px; margin-top: 6px;
  background: linear-gradient(90deg, #7c6bd1, #a78bfa, #c4a3ff);
  -webkit-background-clip: text; background-clip: text;
  -webkit-text-fill-color: transparent;
}
.post p { margin: 16px 0; }
.post h2 { font-size: 20px; margin: 28px 0 8px; color: #5a4d72; }
.post h3 { font-size: 17px; margin: 22px 0 6px; color: var(--muted); }
.post ul, .post ol { margin: 16px 0; padding-left: 24px; }
.post li { margin: 8px 0; }
.post blockquote {
  border-left: 4px solid var(--accent);
  background: rgba(139, 111, 212, 0.08);
  padding: 12px 16px; margin: 20px 0;
  border-radius: 0 8px 8px 0; color: #5a4d72;
}
.post blockquote p { margin: 4px 0; }
.post code {
  background: rgba(139, 111, 212, 0.12);
  padding: 2px 6px; border-radius: 4px;
  font-family: "SFMono-Regular", Consolas, monospace; font-size: 0.92em;
}
.post img {
  max-width: 100%; height: auto; border-radius: 12px;
  margin: 20px 0; display: block;
  box-shadow: 0 8px 28px rgba(120, 100, 160, 0.22);
}
.post figcaption { text-align: center; font-size: 13px; color: var(--muted); margin-top: -12px; }
.back-link { margin-top: 32px; font-size: 15px; }

/* 深色模式：点右上角按钮切到这里（夜间档深紫） */
[data-theme="dark"] {
  --bg:
    radial-gradient(ellipse at 18% 12%, rgba(124, 58, 237, 0.45), transparent 40%),
    radial-gradient(ellipse at 85% 18%, rgba(192, 38, 211, 0.34), transparent 40%),
    radial-gradient(ellipse at 60% 95%, rgba(67, 56, 202, 0.40), transparent 45%),
    linear-gradient(160deg, #1a1140 0%, #241550 48%, #2e1a64 100%);
  --card-bg: rgba(255, 255, 255, 0.08);
  --card-border: rgba(255, 255, 255, 0.14);
  --text: #ece8ff;
  --muted: rgba(235, 230, 255, 0.62);
  --accent: #b388ff;
  --glass-shadow: 0 8px 32px rgba(0, 0, 0, 0.45);
}
@media (prefers-color-scheme: dark) {
  :root:not([data-theme]) {
    --bg:
      radial-gradient(ellipse at 18% 12%, rgba(124, 58, 237, 0.45), transparent 45%),
      radial-gradient(ellipse at 85% 18%, rgba(192, 38, 211, 0.34), transparent 45%),
      radial-gradient(ellipse at 60% 95%, rgba(67, 56, 202, 0.40), transparent 50%),
      linear-gradient(160deg, #1a1140 0%, #241550 48%, #2e1a64 100%);
    --card-bg: rgba(255, 255, 255, 0.08);
    --card-border: rgba(255, 255, 255, 0.14);
    --text: #ece8ff;
    --muted: rgba(235, 230, 255, 0.62);
    --accent: #b388ff;
    --glass-shadow: 0 8px 32px rgba(0, 0, 0, 0.45);
  }
}

/* 手机适配 */
@media (max-width: 600px) {
  .header-inner { flex-direction: column; align-items: flex-start; gap: 10px; }
  .intro { padding: 32px 0 24px; }
  .intro h1 { font-size: 24px; }
  .post-card { padding: 16px 18px; }
  .post { padding: 22px 20px; }
}