/* ThuyHuong Digital: nền chung cho cổng game và các trang giới thiệu:
   bảng màu gốm Lý–Trần ở chế độ sáng và tối, ẩn hiện theo ngôn ngữ
   (tiếng Anh mặc định, tiếng Việt), nút chuyển, bản đồ Việt Nam chìm.
   Chế độ mặc định theo máy; người dùng chọn thì lưu trong localStorage. */

/* ===== Chế độ sáng (hiện đại tối giản: nền trung tính, một màu nhấn đỏ son) ===== */
:root{
  color-scheme:light;
  --ground:#fbfaf7; --panel:#ffffff; --panel-hi:#f3f1ec; --line:#e6e3dc; --rule:#ece9e3;
  --wood:#d9d5cc; --chip:#d6d2c9; --sep:#b5b1a8;
  --son:#b3402e; --on-son:#ffffff;
  --dong:#b3402e; --dong-link:#a23a29; --dong-hi:#7a2a1d;
  --fill:#141414; --fill-hi:#333333; --on-fill:#ffffff;
  --nga:#141414; --nga-2:#3a3936; --muted:#65635e; --label:#6f6d67; --soft:#4a4844;
  --celadon:#2c6b55; --sea:#2f5a4e; --on-sea:#ffffff; --on-sea-2:#d9ece3; --img-bg:#eceae4;
  --hero-bg:#fbfaf7; --hero-ink:#141414; --hero-ink-2:#4a4844; --hero-eyebrow:#b3402e;
  --hero-rule:#e6e3dc; --hero-line:#141414; --hero-wave:rgba(20,20,20,.06);
  --map-ink:#141414; --map-opacity:.045; --shadow:0 1px 2px rgba(0,0,0,.04),0 16px 40px -12px rgba(0,0,0,.14);
  /* --serif giữ tên cũ nhưng nay là chữ không chân đậm cho tiêu đề */
  --serif:ui-sans-serif,system-ui,-apple-system,"Segoe UI",Roboto,"Helvetica Neue",Arial,"Noto Sans",sans-serif;
  --sans:ui-sans-serif,system-ui,-apple-system,"Segoe UI",Roboto,"Helvetica Neue",Arial,"Noto Sans",sans-serif;
}
/* ===== Chế độ tối ===== */
@media (prefers-color-scheme: dark){
  :root:not([data-theme="light"]){
    color-scheme:dark;
    --ground:#0f0f0e; --panel:#181817; --panel-hi:#20201e; --line:#2b2b28; --rule:#242422;
    --wood:#3a3a37; --chip:#3e3e3a; --sep:#55554f;
    --son:#d4604b; --on-son:#ffffff;
    --dong:#ef8a73; --dong-link:#f29a86; --dong-hi:#ffc4b5;
    --fill:#f4f3ef; --fill-hi:#ffffff; --on-fill:#0f0f0e;
    --nga:#f4f3ef; --nga-2:#d8d6d0; --muted:#a3a19b; --label:#9d9b95; --soft:#c9c7c1;
    --celadon:#8fc7ad; --sea:#2f5a4e; --on-sea:#ffffff; --on-sea-2:#d9ece3; --img-bg:#1d1d1b;
    --hero-bg:#0f0f0e; --hero-ink:#f4f3ef; --hero-ink-2:#c9c7c1; --hero-eyebrow:#ef8a73;
    --hero-rule:#2b2b28; --hero-line:#f4f3ef; --hero-wave:rgba(255,255,255,.06);
    --map-ink:#ffffff; --map-opacity:.035; --shadow:0 1px 2px rgba(0,0,0,.3),0 16px 40px -12px rgba(0,0,0,.6);
  }
}
:root[data-theme="dark"]{
  color-scheme:dark;
  --ground:#0f0f0e; --panel:#181817; --panel-hi:#20201e; --line:#2b2b28; --rule:#242422;
  --wood:#3a3a37; --chip:#3e3e3a; --sep:#55554f;
  --son:#d4604b; --on-son:#ffffff;
  --dong:#ef8a73; --dong-link:#f29a86; --dong-hi:#ffc4b5;
  --fill:#f4f3ef; --fill-hi:#ffffff; --on-fill:#0f0f0e;
  --nga:#f4f3ef; --nga-2:#d8d6d0; --muted:#a3a19b; --label:#9d9b95; --soft:#c9c7c1;
  --celadon:#8fc7ad; --sea:#2f5a4e; --on-sea:#ffffff; --on-sea-2:#d9ece3; --img-bg:#1d1d1b;
  --hero-bg:#0f0f0e; --hero-ink:#f4f3ef; --hero-ink-2:#c9c7c1; --hero-eyebrow:#ef8a73;
  --hero-rule:#2b2b28; --hero-line:#f4f3ef; --hero-wave:rgba(255,255,255,.06);
  --map-ink:#ffffff; --map-opacity:.035; --shadow:0 1px 2px rgba(0,0,0,.3),0 16px 40px -12px rgba(0,0,0,.6);
}

/* ===== Nền tảng ===== */
*{margin:0;padding:0;box-sizing:border-box}
html{scroll-behavior:smooth;background:var(--ground)}
body{color:var(--nga);font-family:var(--sans);line-height:1.55;-webkit-font-smoothing:antialiased;
  background:transparent;min-height:100vh}
a{color:var(--dong-link)} a:hover{color:var(--dong-hi)}
:focus-visible{outline:2px solid var(--dong-hi);outline-offset:3px;border-radius:6px}
img{display:block;max-width:100%;height:auto}
[hidden]{display:none !important}

/* ===== Ngôn ngữ: mỗi đoạn có hai bản, chỉ hiện bản đang chọn ===== */
/* .pref (nút chuyển) và .keep (ví dụ lời bài hát tiếng Việt) luôn hiện */
html[lang="en"] body [lang="vi"]:not(.pref):not(.keep),
html[lang="vi"] body [lang="en"]:not(.pref):not(.keep){display:none !important}

/* ===== Bản đồ Việt Nam chìm (gồm Hoàng Sa, Trường Sa) =====
   Đường biên: Natural Earth (phạm vi công cộng) qua gói world-atlas, rút gọn;
   Hoàng Sa vẽ theo toạ độ các đảo chính. Nhúng thẳng làm data: để mặt nạ chạy
   ở mọi nơi (mask từ tệp ngoài cần cùng nguồn) và bớt một lần tải. */
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body::before{content:'';position:fixed;z-index:-1;pointer-events:none;
  top:8vh;left:max(0px,calc(50vw - 720px));width:min(64vh,52vw);height:88vh;
  background:var(--map-ink);opacity:var(--map-opacity);
  -webkit-mask:var(--map-svg) no-repeat center/contain;
          mask:var(--map-svg) no-repeat center/contain}
@media (max-width:700px){
  body::before{left:-14vw;width:96vw;height:82vh;top:12vh}
}
/* Thẻ và khung hơi trong để bản đồ chìm lộ qua */
:root{--glass:color-mix(in srgb,var(--panel) 86%,transparent)}

/* ===== Nút chuyển ngôn ngữ và sáng / tối ===== */
.prefs{display:flex;align-items:center;gap:6px;flex:0 0 auto}
.pref{display:inline-flex;align-items:center;justify-content:center;gap:8px;min-height:44px;min-width:44px;
  padding:0 12px;border:1px solid var(--line);border-radius:999px;background:transparent;
  color:var(--nga);font:600 14px var(--sans);cursor:pointer}
.pref:hover{border-color:var(--dong);color:var(--dong-hi)}
.pref svg{width:18px;height:18px}
.pref .i-sun{display:none}
html[data-mode="dark"] .pref .i-sun{display:block}
html[data-mode="dark"] .pref .i-moon{display:none}

/* ===== Ghi chú: trò chơi bằng tiếng Việt ===== */
.langNote{display:flex;gap:10px;align-items:flex-start;font-size:14px;line-height:1.55;color:var(--muted)}
.langNote svg{flex:0 0 auto;width:18px;height:18px;margin-top:1px;color:var(--dong)}

/* ===== Tiêu đề hiện đại: đậm, khít chữ ===== */
h1,h2,h3{letter-spacing:-.02em}
h1{letter-spacing:-.035em}