/* ============================================================
   Blog Gốc Cây Số 55 — tree55.com/blog
   Tông tối đồng bộ boot screen của game; chữ serif cho bài dài.
   ============================================================ */
:root {
  --bg: #0b0d12;
  --bg2: #141824;
  --panel: #121620;
  --line: #262c3c;
  --ink: #efe9dc;
  --dim: #a8adbc;
  --gold: #ffe9a3;
  --gold2: #d9a514;
  --red: #c9605c;
}
* { box-sizing: border-box; }
html { -webkit-text-size-adjust: 100%; }
/* Font chữ thân bài: KHÔNG dùng Georgia — trên Windows nó thiếu glyph tổ hợp
   tiếng Việt (ề, ố, ắ…) nên trình duyệt ghép từ hai font khác nhau và dấu bị
   tách rời ("Gô´c Cây Sô´ 55"). Cambria/Constantia (Windows), Noto Serif
   (Android/Linux), Times New Roman (macOS) đều có đủ bộ dấu tiếng Việt. */
body {
  margin: 0;
  background: radial-gradient(ellipse at 50% -10%, var(--bg2) 0%, var(--bg) 60%) fixed var(--bg);
  color: var(--ink);
  font-family: Cambria, Constantia, "Noto Serif", "Times New Roman", serif;
  font-size: 18px;
  line-height: 1.72;
}

/* ---- khung ---- */
.wrap { max-width: 760px; margin: 0 auto; padding: 0 20px; }

/* ---- nav ---- */
.site-nav {
  display: flex; align-items: center; gap: 18px;
  padding: 16px 0; margin-bottom: 8px;
  border-bottom: 1px solid var(--line);
  font-family: system-ui, -apple-system, "Segoe UI", sans-serif;
  font-size: 15px;
}
.site-nav .brand {
  display: flex; align-items: center; gap: 8px;
  color: var(--ink); text-decoration: none; font-weight: 700; letter-spacing: 0.5px;
}
.site-nav .brand .plate {
  display: inline-flex; align-items: center; justify-content: center;
  width: 30px; height: 30px; border: 2px solid #d9cbb0; border-radius: 7px;
  color: var(--gold); font-weight: 800; font-size: 14px;
  box-shadow: 0 0 10px rgba(255, 233, 163, 0.22);
}
.site-nav a { color: var(--dim); text-decoration: none; }
.site-nav a:hover, .site-nav a[aria-current="page"] { color: var(--gold); }
.site-nav .play {
  margin-left: auto;
  padding: 7px 14px; border-radius: 8px;
  background: linear-gradient(90deg, var(--gold2), #f0c84a);
  color: #201a08; font-weight: 700;
}
.site-nav .play:hover { color: #000; filter: brightness(1.08); }

/* ---- bài viết ---- */
article { padding: 22px 0 8px; }
h1 {
  font-family: system-ui, -apple-system, "Segoe UI", sans-serif;
  font-size: clamp(26px, 5.2vw, 38px); line-height: 1.25;
  margin: 8px 0 10px; color: var(--ink); letter-spacing: 0.2px;
}
.meta-line {
  font-family: system-ui, sans-serif; font-size: 14px; color: var(--dim);
  display: flex; flex-wrap: wrap; gap: 6px 14px; margin-bottom: 22px;
}
.meta-line .tag { color: var(--gold); }
h2 {
  font-family: system-ui, -apple-system, "Segoe UI", sans-serif;
  font-size: clamp(20px, 3.6vw, 26px); line-height: 1.3;
  margin: 38px 0 10px; color: var(--gold);
}
h3 {
  font-family: system-ui, sans-serif; font-size: 18px;
  margin: 26px 0 8px; color: var(--ink);
}
p { margin: 0 0 16px; }
a { color: var(--gold); text-underline-offset: 3px; }
a:hover { color: #fff3c4; }
strong { color: #fff; }
.lead { font-size: 20px; line-height: 1.7; color: #f7f2e6; }
ul, ol { padding-left: 24px; margin: 0 0 16px; }
li { margin-bottom: 8px; }

blockquote {
  margin: 22px 0; padding: 14px 20px;
  border-left: 3px solid var(--red);
  background: rgba(201, 96, 92, 0.07);
  border-radius: 0 10px 10px 0;
  color: #f3ece0; font-style: italic;
}
blockquote cite {
  display: block; margin-top: 8px;
  font-family: system-ui, sans-serif; font-style: normal;
  font-size: 13.5px; color: var(--dim);
}

.timeline { list-style: none; padding: 0; margin: 0 0 16px; }
.timeline li {
  position: relative; padding: 0 0 18px 26px;
  border-left: 2px solid var(--line); margin: 0 0 0 8px;
}
.timeline li::before {
  content: ""; position: absolute; left: -6px; top: 7px;
  width: 10px; height: 10px; border-radius: 50%;
  background: var(--gold2); box-shadow: 0 0 8px rgba(255, 233, 163, 0.5);
}
.timeline b.d {
  display: block; font-family: system-ui, sans-serif;
  font-size: 14px; color: var(--gold); letter-spacing: 0.4px;
}

.note-box {
  margin: 22px 0; padding: 14px 18px;
  border: 1px solid var(--line); border-radius: 12px;
  background: var(--panel);
  font-family: system-ui, sans-serif; font-size: 15px; color: var(--dim);
}
.note-box b { color: var(--ink); }

/* ---- nguồn ---- */
.sources {
  margin-top: 34px; padding: 16px 18px;
  border: 1px solid var(--line); border-radius: 12px; background: var(--panel);
  font-family: system-ui, sans-serif; font-size: 14px;
}
.sources h2 { margin: 0 0 8px; font-size: 15px; color: var(--dim); text-transform: uppercase; letter-spacing: 1px; }
.sources ol { margin: 0; padding-left: 20px; }
.sources li { margin-bottom: 5px; color: var(--dim); }
.sources a { color: var(--gold); word-break: break-all; }

/* ---- CTA game ---- */
.cta-game {
  margin: 36px 0 8px; padding: 22px;
  border: 1px solid rgba(255, 233, 163, 0.35); border-radius: 14px;
  background: linear-gradient(160deg, rgba(217, 165, 20, 0.10), rgba(20, 24, 36, 0.6));
  text-align: center; font-family: system-ui, sans-serif;
}
.cta-game .big { font-size: 19px; font-weight: 700; margin-bottom: 6px; }
.cta-game p { color: var(--dim); font-size: 15px; margin-bottom: 14px; }
.cta-game a.btn {
  display: inline-block; padding: 11px 22px; border-radius: 10px;
  background: linear-gradient(90deg, var(--gold2), #f0c84a);
  color: #201a08; font-weight: 800; text-decoration: none; font-size: 16px;
}
.cta-game a.btn:hover { filter: brightness(1.08); }

/* ---- bài liên quan ---- */
.related { margin: 30px 0 0; font-family: system-ui, sans-serif; }
.related h2 { font-size: 16px; color: var(--dim); text-transform: uppercase; letter-spacing: 1px; margin: 0 0 12px; }
.related ul { list-style: none; padding: 0; margin: 0; }
.related li { margin: 0 0 10px; padding-left: 18px; position: relative; }
.related li::before { content: "🌼"; position: absolute; left: -6px; top: 1px; font-size: 11px; }

/* ---- danh sách bài (trang /blog/) ---- */
.post-list { list-style: none; padding: 0; margin: 26px 0; }
.post-card {
  display: block; margin-bottom: 18px; padding: 20px 22px;
  border: 1px solid var(--line); border-radius: 14px; background: var(--panel);
  text-decoration: none; transition: border-color 0.2s, transform 0.15s;
}
.post-card:hover { border-color: rgba(255, 233, 163, 0.5); transform: translateY(-1px); }
.post-card h2 {
  margin: 0 0 6px; font-size: 20px; color: var(--ink); line-height: 1.35;
}
.post-card:hover h2 { color: var(--gold); }
.post-card .pc-date {
  font-family: system-ui, sans-serif; font-size: 13px; color: var(--gold2);
  letter-spacing: 0.4px;
}
.post-card p { margin: 6px 0 0; color: var(--dim); font-size: 15.5px; line-height: 1.6; }

.blog-intro { color: var(--dim); font-size: 17px; margin-top: 4px; }

/* ---- footer ---- */
.site-footer {
  margin-top: 44px; padding: 20px 0 34px;
  border-top: 1px solid var(--line);
  font-family: system-ui, sans-serif; font-size: 13.5px; color: var(--dim);
  display: flex; flex-wrap: wrap; gap: 8px 18px;
}
.site-footer a { color: var(--dim); }
.site-footer a:hover { color: var(--gold); }

@media (max-width: 560px) {
  body { font-size: 17px; }
  /* nav chật: bỏ link phụ (logo đã trỏ về /blog/), giữ nút chơi game trên 1 dòng */
  .site-nav { gap: 10px; font-size: 14px; }
  .site-nav > a:not(.brand):not(.play) { display: none; }
  .site-nav .brand { font-size: 14px; line-height: 1.2; }
  .site-nav .play { white-space: nowrap; padding: 7px 12px; }
  .post-card { padding: 16px 16px; }
}