/* Bảng màu mệnh Kim (Kim xuyến thoa): trắng ngà ánh bạc, xám chì, vàng đồng; khung màu đất (Thổ sinh Kim). Triện vàng đồng.
   Layout: một tờ giấy dó lồng trong khung; các "quyển" xếp như bản in mộc bản; bấm vào quyển mở trang xem ảnh lớn.
   Cố ý chỉ một giao diện sáng (giấy), không đổi theo chế độ tối. */
:root{
  --go:#6b5a3c; --go-dam:#41372a; --vien:#c9c6bd;
  --giay:#ecebe6; --diep:#f7f6f2;
  --muc:#23262a; --muc-nhat:#64676b;
  --son:#856525; --trien:#8f6a22; --trien-nhat:#f6edd5;
  --display:"Alegreya SC","Palatino Linotype",Georgia,serif;
  --body:"Alegreya",Georgia,serif;
  --ky:"Dancing Script","Brush Script MT",cursive;
  --mono:"IBM Plex Mono",ui-monospace,monospace;
  color-scheme:light;
}
*{box-sizing:border-box}
html{background:var(--go-dam)}
body{margin:0;background:var(--go);background-image:repeating-linear-gradient(92deg,rgba(0,0,0,.10) 0 1px,transparent 1px 7px),repeating-linear-gradient(88deg,rgba(255,255,255,.04) 0 2px,transparent 2px 13px);color:var(--muc);font-family:var(--body);font-size:17px;line-height:1.65;padding:clamp(10px,3vw,28px) clamp(10px,3vw,28px)}
.to-giay{max-width:1120px;margin:0 auto;background:var(--giay);
  background-image:radial-gradient(rgba(255,255,255,.6) .8px,transparent 1.3px),radial-gradient(rgba(105,105,100,.10) 1px,transparent 1.4px),radial-gradient(rgba(105,105,100,.06) 1px,transparent 1.2px),linear-gradient(120deg,rgba(255,255,255,.25),rgba(255,255,255,0) 40%,rgba(255,255,255,.18) 70%,rgba(150,140,110,.08));
  background-size:4px 5px,7px 9px,11px 13px,100% 100%;
  box-shadow:0 0 0 2px var(--go-dam),0 0 0 6px var(--vien),0 0 0 8px var(--go-dam),0 20px 50px rgba(0,0,0,.45);
  padding-inline:clamp(16px,5vw,64px);padding-block:clamp(24px,5vw,56px)}
a{color:inherit}
:focus-visible{outline:2px solid var(--son);outline-offset:3px}

/* Đầu trang */
.dau{display:flex;justify-content:space-between;align-items:center;gap:16px;flex-wrap:wrap;border-bottom:3px double var(--muc);padding-bottom:14px}
.ten{display:flex;align-items:center;gap:14px;text-decoration:none}
.trien{width:58px;height:58px;flex:none;background:var(--trien);color:var(--trien-nhat);display:grid;place-items:center;text-align:center;font:700 13px/1.05 var(--display);border-radius:3px;transform:rotate(-3deg);box-shadow:inset 0 0 0 3px var(--trien),inset 0 0 0 5px var(--trien-nhat);filter:url(#nhoe)}
.ten b{font:700 26px/1 var(--display);letter-spacing:.08em}
.ten small{display:block;font:12px var(--mono);color:var(--muc-nhat);letter-spacing:.06em}
nav{display:flex;gap:22px;font:500 15px var(--display);letter-spacing:.1em}
nav a{text-decoration:none;border-bottom:1px solid transparent}
nav a:hover{border-color:var(--muc)}

/* Mở đầu */
.mo{display:grid;grid-template-columns:minmax(0,1.5fr) minmax(0,1fr);gap:clamp(20px,4vw,48px);align-items:end;padding-block:clamp(28px,5vw,56px)}
@media (max-width:760px){.mo{grid-template-columns:1fr}}
.anh-lon{position:relative}
.khung{outline:2px solid var(--muc);outline-offset:5px;background:var(--diep);padding:0;display:block;width:100%;max-width:100%}
.mo h1{font:700 clamp(40px,7vw,76px)/.95 var(--display);margin:0 0 14px;letter-spacing:.02em;text-wrap:balance}
.mo p{margin:0 0 12px;max-width:40ch}
.ky{font:600 28px var(--ky);color:var(--muc)}
.ghi{font:13px var(--mono);color:var(--muc-nhat)}

/* Cảnh giữ chỗ */
.canh{display:block;width:100%;max-width:100%;aspect-ratio:4/3;filter:sepia(.35) saturate(.8) contrast(1.05)}
.c1{background:linear-gradient(180deg,#d6dcd6 0%,#aab7a2 34%,#6f8a52 35%,#88a35e 48%,#5e7a3c 49%,#7d9850 62%,#4f6b33 63%,#6b8a42 76%,#3f5a2a 77%,#5a7a38 100%)}
.c2{background:radial-gradient(circle at 30% 42%,#ffd27a 0 2.5%,transparent 3.5%),radial-gradient(circle at 58% 36%,#ffc560 0 2.5%,transparent 3.5%),radial-gradient(circle at 80% 46%,#ffb347 0 2%,transparent 3%),linear-gradient(180deg,#2a2c3a 0%,#4a3a2e 54%,#c08a4a 55%,#8a5e36 70%,#4a3324 100%)}
.c3{background:radial-gradient(ellipse at 28% 78%,#55606a 0 22%,transparent 23%),radial-gradient(ellipse at 74% 82%,#46505a 0 28%,transparent 29%),radial-gradient(ellipse at 50% 92%,#3a434b 0 30%,transparent 31%),linear-gradient(180deg,#eef0ef,#c3cacd 55%,#8d989f)}
.c4{background:linear-gradient(175deg,#cfdde0 0%,#a8c2c8 30%,#7b9a6a 31%,#c9b26a 46%,#9a8a3e 47%,#d8c070 60%,#6f7d3a 61%,#a3a24c 100%)}
.c5{background:linear-gradient(180deg,#b9cdd6 0%,#e5e8e2 35%,#5d7b4a 36%,#3e5e3a 58%,#6b5b44 59%,#8a7457 100%)}
.c6{background:linear-gradient(180deg,#f2c79b 0%,#e9a274 32%,#c06b4f 47%,#2f4c63 48%,#3c6178 68%,#d8c6a3 69%,#cbb48e 100%)}

/* Các quyển */
.muc-luc{display:flex;justify-content:space-between;align-items:baseline;gap:12px;flex-wrap:wrap;border-top:1px solid var(--muc);padding-top:12px;margin-top:8px}
.muc-luc h2{font:700 26px var(--display);letter-spacing:.06em;margin:0}
.quyen-list{display:grid;grid-template-columns:repeat(auto-fill,minmax(240px,1fr));gap:clamp(22px,3vw,36px);padding-block:26px 8px;list-style:none;margin:0;padding-inline:0}
.quyen-list li{display:flex}
.quyen{all:unset;box-sizing:border-box;width:100%;align-content:start;cursor:pointer;display:grid;gap:12px;background:var(--diep);padding:12px 12px 16px;border:1px solid rgba(30,25,20,.35);box-shadow:3px 3px 0 rgba(30,25,20,.15);transition:transform .2s ease,box-shadow .2s ease}
.quyen:hover{transform:translateY(-3px) rotate(-.4deg);box-shadow:5px 7px 0 rgba(30,25,20,.18)}
.quyen:focus-visible{outline:2px solid var(--son);outline-offset:4px}
.quyen .canh{aspect-ratio:3/2;outline:1.5px solid var(--muc);outline-offset:3px}
.qs{display:flex;justify-content:space-between;align-items:baseline;gap:8px}
.qs b{font:700 15px var(--display);letter-spacing:.1em;color:var(--son)}
.qs span{font:12px var(--mono);color:var(--muc-nhat)}
.quyen h3{margin:0;font:500 22px/1.15 var(--body)}
.quyen p{margin:0;font-size:15px;color:var(--muc-nhat)}

/* Về Thằng Mục + chân trang */
.ve{display:grid;grid-template-columns:auto minmax(0,1fr);gap:24px;align-items:start;border-top:3px double var(--muc);margin-top:40px;padding-top:26px}
@media (max-width:560px){.ve{grid-template-columns:1fr}}
.ve .trien{width:88px;height:88px;font-size:20px}
.ve p{margin:0 0 10px;max-width:60ch}
.chan{margin-top:30px;display:flex;justify-content:space-between;gap:12px;flex-wrap:wrap;font:12px var(--mono);color:var(--muc-nhat)}
.vd{display:inline-block;font:11px var(--mono);letter-spacing:.06em;color:var(--son);border:1px solid var(--son);padding:1px 8px;border-radius:2px}

/* Trang xem ảnh */
.xem{position:fixed;inset:0;z-index:10;background:var(--giay);background-image:radial-gradient(rgba(105,105,100,.10) 1px,transparent 1.4px),radial-gradient(rgba(255,255,255,.5) .8px,transparent 1.3px);background-size:7px 9px,4px 5px;overflow-y:auto;padding-top:env(safe-area-inset-top,0px);padding-bottom:env(safe-area-inset-bottom,0px)}
.xem-in{max-width:1100px;margin:0 auto;padding:clamp(16px,4vw,40px);display:grid;gap:22px;align-content:start}
.xem-dau{display:flex;justify-content:space-between;align-items:center;gap:12px;border-bottom:1px solid var(--muc);padding-bottom:10px}
.xem-dau .q{font:700 15px var(--display);letter-spacing:.12em;color:var(--son)}
.nut{all:unset;cursor:pointer;font:500 14px var(--display);letter-spacing:.1em;padding:6px 12px;border:1px solid var(--muc)}
.nut:hover{background:var(--muc);color:var(--giay)}
.nut:focus-visible{outline:2px solid var(--son);outline-offset:2px}
.xem-than{display:grid;grid-template-columns:minmax(0,2fr) minmax(0,1fr);gap:clamp(20px,4vw,44px);align-items:end}
@media (max-width:760px){.xem-than{grid-template-columns:1fr}}
.xem-than .canh{aspect-ratio:3/2;outline:2px solid var(--muc);outline-offset:6px}
.chu h2{font:500 clamp(28px,4vw,40px)/1.1 var(--body);margin:0 0 8px;text-wrap:balance}
.chu p{margin:0 0 14px}
.thong-so{display:grid;grid-template-columns:auto 1fr;gap:2px 14px;font:13px var(--mono);color:var(--muc-nhat);margin:0 0 16px}
.thong-so dt{color:var(--muc)}
.thong-so dd{margin:0}
.dai{display:flex;align-items:flex-start;gap:10px;overflow-x:auto;padding:6px 4px 10px}
.dai button{all:unset;display:block;line-height:0;cursor:pointer;flex:none;width:96px;outline:1.5px solid transparent;outline-offset:3px;opacity:.6}
.dai button[aria-current="true"]{outline-color:var(--son);opacity:1}
.dai button:focus-visible{outline-color:var(--son)}
.dai .canh{aspect-ratio:3/2}
.dieu-huong{display:flex;justify-content:space-between;gap:10px}
@media (prefers-reduced-motion:reduce){.quyen{transition:none}}
/* Ảnh thật: lấp đầy khung, giữ tỉ lệ */
.canh>img{display:block;width:100%;height:100%;object-fit:cover}
.canh.co-anh{background:var(--diep);filter:sepia(.12) saturate(.95)}
html{scroll-behavior:smooth}
@media (prefers-reduced-motion:reduce){html{scroll-behavior:auto}}