/* =========================================================
   Bảo tàng Sông Hồng — bảo tàng lịch sử – văn hóa (hư cấu) — style.css
   Phong cách: nền tối sang trọng, đen #14120F + vàng đồng cổ #B08A4C
   + kem #F1E9DA + đá xám #6E675C. Chữ display "Cinzel" (serif khắc đá,
   chữ hoa giãn cách), chữ thân "Spectral" (serif đọc dài).
   Bố cục khác các mẫu trước:
     - Header: DÒNG TRÊN mỏng (giờ mở cửa · "Hôm nay mở cửa đến 17:30" · ngôn ngữ)
       + dòng chính: dấu triện (seal) + tên bảo tàng bên trái, nav phải, nút "Mua vé" đồng
     - Hero: ảnh tối tràn màn hình, TIÊU ĐỀ SERIF KHỔ LỚN bên trái,
       THANH RAY DỌC bên phải liệt kê 4 khu trưng bày (rê chuột sáng lên)
     - "Dòng thời gian": CUỘN NGANG TOÀN CHIỀU RỘNG (scroll-snap theo thế kỷ,
       thẻ = nhãn thế kỷ Cinzel + ảnh hiện vật + 2 dòng mô tả); phía dưới có
       ĐƯỜNG TIẾN ĐỘ với vạch từng thời kỳ, JS sáng vạch đang xem khi cuộn
     - Trưng bày thường xuyên 6 thẻ (số khu + tầng), Triển lãm chuyên đề 2 thẻ lớn
       có khoảng ngày + nhãn "Sắp kết thúc"
     - SƠ ĐỒ TẦNG TƯƠNG TÁC: 4 tab tầng, mỗi tầng một SVG phòng bấm được →
       thẻ thông tin (tên khu, số hiện vật, thời gian tham quan)
     - Vé: 3 loại + CHỌN KHUNG GIỜ (ô ngày + 6 chip giờ có "còn N chỗ", JS đổi theo ngày)
     - Giáo dục 3 chương trình, Kế hoạch tham quan (danh sách mẹo), footer 4 cột + bản đồ giả
   Ảnh: link trực tiếp qua biến --img trên .ph (không tải về).
   Breakpoint: 1100 / 980 / 640px. Menu mobile: .burger#burger bật #nav.is-open
   ========================================================= */

:root{
  --black:#14120F;
  --black-2:#1C1915;
  --black-3:#24201B;
  --bronze:#B08A4C;
  --bronze-light:#D4B274;
  --bronze-dark:#7E6034;
  --cream:#F1E9DA;
  --cream-2:#E2D8C4;
  --stone:#6E675C;
  --stone-light:#9A9184;
  --line:rgba(176,138,76,.28);
  --ph:#2a2622;
  --font-display:"Cinzel","Times New Roman",serif;
  --font-body:"Spectral",Georgia,serif;
  --radius:4px;
  --shadow:0 18px 40px rgba(0,0,0,.45);
}

*{box-sizing:border-box;margin:0;padding:0}
html{scroll-behavior:smooth}
body{font-family:var(--font-body);font-size:17px;line-height:1.65;color:var(--cream);background:var(--black)}
img{max-width:100%;display:block}
a{color:inherit;text-decoration:none}
ul{list-style:none}
button,input,select,textarea{font:inherit;color:inherit}
button{cursor:pointer;background:none;border:0}
.container{width:min(1200px,92%);margin:0 auto}
.ph{background:var(--img,var(--ph)) center/cover no-repeat;background-color:#2a2622}

h1,h2,h3,h4,.display{font-family:var(--font-display);font-weight:600;line-height:1.15;letter-spacing:.02em}
h2{font-size:clamp(28px,3.2vw,42px)}
h3{font-size:22px}
p{max-width:68ch}
.muted{color:var(--stone-light)}
.eyebrow{font-family:var(--font-display);font-size:12px;letter-spacing:.32em;text-transform:uppercase;color:var(--bronze);display:flex;align-items:center;gap:14px;margin-bottom:14px}
.eyebrow::before{content:"";width:34px;height:1px;background:var(--bronze)}
.sec-head{display:flex;justify-content:space-between;align-items:flex-end;gap:24px;margin-bottom:40px;flex-wrap:wrap}
.sec-head p{margin-top:10px;color:var(--stone-light);max-width:56ch}
.section{padding:96px 0}
.section--tight{padding:64px 0}
.section--alt{background:var(--black-2)}
.divider{height:1px;background:linear-gradient(90deg,transparent,var(--bronze),transparent);opacity:.6}

/* Nút */
.btn{display:inline-flex;align-items:center;justify-content:center;gap:10px;padding:14px 26px;font-family:var(--font-display);font-size:13px;letter-spacing:.2em;text-transform:uppercase;border:1px solid var(--bronze);color:var(--cream);transition:.25s;border-radius:2px}
.btn:hover{background:var(--bronze);color:var(--black)}
.btn--solid{background:var(--bronze);color:var(--black)}
.btn--solid:hover{background:var(--bronze-light);border-color:var(--bronze-light)}
.btn--ghost{border-color:rgba(241,233,218,.35)}
.btn--ghost:hover{border-color:var(--cream);background:transparent;color:var(--cream)}
.btn--sm{padding:10px 18px;font-size:11px}
.link{color:var(--bronze);font-family:var(--font-display);font-size:12px;letter-spacing:.2em;text-transform:uppercase;border-bottom:1px solid transparent;transition:.2s}
.link:hover{border-color:var(--bronze)}

/* =================== HEADER =================== */
.topline{background:#0E0C0A;border-bottom:1px solid var(--line);font-size:13px;color:var(--stone-light)}
.topline .container{display:flex;justify-content:space-between;align-items:center;gap:18px;min-height:36px}
.topline-left{display:flex;gap:22px;flex-wrap:wrap}
.topline .open{color:var(--cream);display:flex;align-items:center;gap:8px}
.topline .open::before{content:"";width:7px;height:7px;border-radius:50%;background:#7BAF6B;box-shadow:0 0 0 3px rgba(123,175,107,.2)}
.lang{display:flex;gap:10px;font-family:var(--font-display);font-size:11px;letter-spacing:.15em}
.lang a{opacity:.6}.lang a.is-active{opacity:1;color:var(--bronze)}
.header{position:sticky;top:0;z-index:50;background:rgba(20,18,15,.92);backdrop-filter:blur(8px);border-bottom:1px solid var(--line)}
.header .container{display:flex;align-items:center;justify-content:space-between;gap:24px;min-height:84px}
.brand{display:flex;align-items:center;gap:14px}
.seal{width:50px;height:50px;border:1.5px solid var(--bronze);border-radius:50%;display:grid;place-items:center;position:relative;font-family:var(--font-display);font-weight:700;font-size:15px;color:var(--bronze);letter-spacing:0;flex-shrink:0}
.seal::after{content:"";position:absolute;inset:4px;border:1px solid var(--bronze);border-radius:50%;opacity:.55}
.brand-name{font-family:var(--font-display);font-size:17px;letter-spacing:.14em;text-transform:uppercase;line-height:1.1}
.brand-name small{display:block;font-family:var(--font-body);font-size:12px;letter-spacing:.08em;text-transform:none;color:var(--stone-light);margin-top:3px}
.nav{display:flex;align-items:center;gap:30px}
.nav a{font-family:var(--font-display);font-size:12px;letter-spacing:.18em;text-transform:uppercase;color:var(--cream-2);padding:6px 0;border-bottom:1px solid transparent;transition:.2s}
.nav a:hover,.nav a.is-active{color:var(--bronze);border-color:var(--bronze)}
.header-cta{display:flex;align-items:center;gap:16px}
.burger{display:none;width:44px;height:44px;flex-direction:column;justify-content:center;align-items:center;gap:6px}
.burger span{width:24px;height:1.5px;background:var(--cream);transition:.25s}

/* =================== HERO =================== */
.hero{position:relative;min-height:min(92vh,880px);display:grid;grid-template-columns:1fr 340px;color:var(--cream);overflow:hidden}
.hero .hero-bg{position:absolute;inset:0;z-index:0}
.hero .hero-bg::after{content:"";position:absolute;inset:0;background:linear-gradient(90deg,rgba(20,18,15,.92) 0%,rgba(20,18,15,.55) 55%,rgba(20,18,15,.35) 100%),linear-gradient(0deg,var(--black) 0%,transparent 40%)}
.hero-body{position:relative;z-index:1;padding:110px 0 90px;display:flex;flex-direction:column;justify-content:flex-end}
.hero-body .container{width:min(1200px,92%);margin:0 auto;padding-right:40px}
.hero-body h1{font-size:clamp(44px,6.4vw,92px);font-weight:600;line-height:1.02;max-width:12ch;margin:18px 0 26px}
.hero-body h1 em{font-style:normal;color:var(--bronze)}
.hero-body p{font-size:19px;color:var(--cream-2);max-width:52ch}
.hero-actions{display:flex;gap:14px;flex-wrap:wrap;margin-top:34px}
.hero-meta{display:flex;gap:40px;margin-top:48px;padding-top:24px;border-top:1px solid rgba(241,233,218,.2);max-width:680px}
.hero-meta strong{display:block;font-family:var(--font-display);font-size:26px;color:var(--bronze)}
.hero-meta span{font-size:13px;color:var(--stone-light);letter-spacing:.06em}
.rail{position:relative;z-index:1;border-left:1px solid rgba(176,138,76,.35);background:rgba(20,18,15,.55);backdrop-filter:blur(4px);display:flex;flex-direction:column;justify-content:center}
.rail-title{font-family:var(--font-display);font-size:11px;letter-spacing:.32em;text-transform:uppercase;color:var(--bronze);padding:0 34px 18px}
.rail a{display:grid;grid-template-columns:44px 1fr;gap:14px;align-items:center;padding:24px 34px;border-top:1px solid rgba(176,138,76,.22);transition:.25s;position:relative}
.rail a:last-child{border-bottom:1px solid rgba(176,138,76,.22)}
.rail a::before{content:"";position:absolute;left:0;top:0;bottom:0;width:3px;background:var(--bronze);transform:scaleY(0);transition:.25s;transform-origin:bottom}
.rail a:hover{background:rgba(176,138,76,.12)}
.rail a:hover::before{transform:scaleY(1)}
.rail .num{font-family:var(--font-display);font-size:26px;color:var(--bronze);line-height:1}
.rail .name{font-family:var(--font-display);font-size:14px;letter-spacing:.06em}
.rail .floor{display:block;font-family:var(--font-body);font-size:13px;color:var(--stone-light);margin-top:4px}

/* =================== DÒNG THỜI GIAN =================== */
.timeline{padding:90px 0 60px;background:var(--black-2);overflow:hidden}
.timeline .sec-head{width:min(1200px,92%);margin:0 auto 34px}
.tl-track{display:flex;gap:22px;overflow-x:auto;scroll-snap-type:x mandatory;padding:6px calc((100vw - min(1200px,92vw))/2) 26px;scrollbar-width:none;scroll-padding-left:calc((100vw - min(1200px,92vw))/2)}
.tl-track::-webkit-scrollbar{display:none}
.era{flex:0 0 400px;scroll-snap-align:start;background:var(--black-3);border:1px solid var(--line);display:flex;flex-direction:column;transition:.3s;position:relative}
.era.is-current{border-color:var(--bronze);box-shadow:0 0 0 1px var(--bronze) inset}
.era-century{font-family:var(--font-display);font-size:34px;color:var(--bronze);padding:22px 26px 6px;letter-spacing:.06em;line-height:1}
.era-century small{display:block;font-size:12px;letter-spacing:.28em;color:var(--stone-light);margin-top:8px}
.era .ph{aspect-ratio:16/10;margin:16px 26px 0;position:relative}
.era .ph .cap{position:absolute;left:0;right:0;bottom:0;padding:22px 14px 10px;font-size:12px;letter-spacing:.06em;color:var(--cream);background:linear-gradient(0deg,rgba(20,18,15,.92),transparent)}
.era-body{padding:18px 26px 26px}
.era-body h3{font-size:19px;margin-bottom:8px}
.era-body p{font-size:15px;color:var(--stone-light);display:-webkit-box;-webkit-line-clamp:2;line-clamp:2;-webkit-box-orient:vertical;overflow:hidden}
.tl-progress{width:min(1200px,92%);margin:22px auto 0;position:relative;height:60px}
.tl-progress .line{position:absolute;left:0;right:0;top:10px;height:1px;background:rgba(176,138,76,.3)}
.tl-progress .fill{position:absolute;left:0;top:10px;height:1px;background:var(--bronze);width:0;transition:width .35s}
.tl-ticks{position:relative;display:flex;justify-content:space-between}
.tick{position:relative;padding-top:24px;font-family:var(--font-display);font-size:11px;letter-spacing:.1em;color:var(--stone);cursor:pointer;transition:.25s;text-align:center;flex:1}
.tick::before{content:"";position:absolute;top:6px;left:50%;transform:translateX(-50%);width:9px;height:9px;border-radius:50%;background:var(--black-2);border:1px solid var(--stone);transition:.25s}
.tick.is-current{color:var(--bronze)}
.tick.is-current::before{background:var(--bronze);border-color:var(--bronze);box-shadow:0 0 0 4px rgba(176,138,76,.25)}
.tl-nav{display:flex;gap:10px}
.tl-nav button{width:46px;height:46px;border:1px solid var(--bronze);color:var(--bronze);font-size:18px;transition:.2s}
.tl-nav button:hover{background:var(--bronze);color:var(--black)}

/* =================== TRƯNG BÀY =================== */
.grid-3{display:grid;grid-template-columns:repeat(3,1fr);gap:24px}
.grid-2{display:grid;grid-template-columns:repeat(2,1fr);gap:24px}
.exhibit{background:var(--black-2);border:1px solid var(--line);display:flex;flex-direction:column;transition:.3s}
.exhibit:hover{transform:translateY(-4px);border-color:var(--bronze)}
.exhibit .ph{aspect-ratio:4/3;position:relative}
.exhibit .ph .cap{position:absolute;left:0;right:0;bottom:0;padding:26px 16px 12px;font-size:12px;letter-spacing:.06em;background:linear-gradient(0deg,rgba(20,18,15,.92),transparent)}
.exhibit .tag-floor{position:absolute;top:14px;left:14px;font-family:var(--font-display);font-size:11px;letter-spacing:.2em;background:rgba(20,18,15,.85);color:var(--bronze);padding:6px 10px;border:1px solid var(--line)}
.exhibit-body{padding:22px 22px 26px;flex:1;display:flex;flex-direction:column;gap:10px}
.exhibit-body .num{font-family:var(--font-display);font-size:12px;letter-spacing:.3em;color:var(--bronze)}
.exhibit-body h3{font-size:20px}
.exhibit-body p{font-size:15px;color:var(--stone-light)}
.exhibit-body .meta{margin-top:auto;padding-top:14px;border-top:1px solid var(--line);font-size:13px;color:var(--stone-light);display:flex;gap:18px;flex-wrap:wrap}

/* Triển lãm chuyên đề */
.special{position:relative;min-height:440px;display:flex;align-items:flex-end;border:1px solid var(--line);overflow:hidden}
.special .ph{position:absolute;inset:0;transition:transform .6s}
.special:hover .ph{transform:scale(1.04)}
.special::after{content:"";position:absolute;inset:0;background:linear-gradient(0deg,rgba(20,18,15,.96) 20%,rgba(20,18,15,.3) 70%,transparent)}
.special-body{position:relative;z-index:1;padding:36px}
.special-body h3{font-size:28px;margin:10px 0 12px}
.special-body p{color:var(--cream-2);font-size:15px}
.special .dates{font-family:var(--font-display);font-size:12px;letter-spacing:.22em;color:var(--bronze)}
.tag{display:inline-block;font-family:var(--font-display);font-size:10px;letter-spacing:.22em;text-transform:uppercase;padding:6px 10px;border:1px solid var(--bronze);color:var(--bronze);margin-right:8px}
.tag--warn{background:#8C3B2E;border-color:#8C3B2E;color:var(--cream)}
.tag--soon{background:var(--bronze);color:var(--black)}
.special .tags{position:absolute;top:20px;left:20px;z-index:1}

/* =================== SƠ ĐỒ TẦNG =================== */
.floors{display:grid;grid-template-columns:1.5fr 1fr;gap:36px;align-items:start}
.floor-tabs{display:flex;gap:6px;border-bottom:1px solid var(--line);margin-bottom:24px}
.floor-tabs button{padding:14px 22px;font-family:var(--font-display);font-size:12px;letter-spacing:.2em;text-transform:uppercase;color:var(--stone-light);border-bottom:2px solid transparent;margin-bottom:-1px;transition:.2s}
.floor-tabs button:hover{color:var(--cream)}
.floor-tabs button.is-active{color:var(--bronze);border-color:var(--bronze)}
.floor-plan{display:none}
.floor-plan.is-active{display:block}
.floor-plan svg{width:100%;height:auto;display:block;background:var(--black-2);border:1px solid var(--line)}
.room{fill:#2A2621;stroke:var(--bronze);stroke-width:1;cursor:pointer;transition:.25s}
.room:hover{fill:#3A3328}
.room.is-active{fill:var(--bronze)}
.room-label{font-family:var(--font-display);font-size:11px;fill:var(--cream);pointer-events:none;letter-spacing:.08em}
.room.is-active + .room-label{fill:var(--black)}
.room-sub{font-family:var(--font-body);font-size:9px;fill:var(--stone-light);pointer-events:none}
.room.is-active + .room-label + .room-sub{fill:#3E2E14}
.svc{fill:#1E1B17;stroke:var(--stone);stroke-width:1;stroke-dasharray:3 3}
.svc-label{font-family:var(--font-body);font-size:9px;fill:var(--stone-light);pointer-events:none}
.room-info{background:var(--black-2);border:1px solid var(--bronze);padding:30px;position:sticky;top:110px}
.room-info .eyebrow{margin-bottom:8px}
.room-info h3{font-size:24px;margin-bottom:12px}
.room-info p{font-size:15px;color:var(--stone-light);margin-bottom:18px}
.room-info dl{display:grid;grid-template-columns:1fr 1fr;gap:14px;margin-bottom:22px}
.room-info dt{font-size:12px;letter-spacing:.14em;text-transform:uppercase;color:var(--stone)}
.room-info dd{font-family:var(--font-display);font-size:20px;color:var(--bronze)}
.legend{display:flex;gap:18px;flex-wrap:wrap;font-size:13px;color:var(--stone-light);margin-top:14px}
.legend span{display:flex;align-items:center;gap:8px}
.legend i{width:14px;height:14px;display:inline-block;border:1px solid var(--bronze);background:#2A2621}
.legend i.a{background:var(--bronze)}
.legend i.s{border:1px dashed var(--stone);background:#1E1B17}

/* =================== VÉ =================== */
.tickets{display:grid;grid-template-columns:1fr 1fr;gap:40px;align-items:start}
.ticket-list{display:grid;gap:14px}
.ticket{display:grid;grid-template-columns:1fr auto;gap:16px;align-items:center;padding:22px 24px;background:var(--black-2);border:1px solid var(--line);transition:.2s}
.ticket:hover{border-color:var(--bronze)}
.ticket h3{font-size:18px;margin-bottom:4px}
.ticket p{font-size:14px;color:var(--stone-light)}
.ticket .price{font-family:var(--font-display);font-size:24px;color:var(--bronze);white-space:nowrap}
.ticket .price small{display:block;font-family:var(--font-body);font-size:12px;color:var(--stone-light);text-align:right;letter-spacing:.06em}
.slot-box{background:var(--black-2);border:1px solid var(--bronze);padding:30px}
.slot-box h3{font-size:22px;margin-bottom:6px}
.slot-box>p{font-size:14px;color:var(--stone-light);margin-bottom:20px}
.field{display:flex;flex-direction:column;gap:8px;margin-bottom:18px}
.field label{font-family:var(--font-display);font-size:11px;letter-spacing:.2em;text-transform:uppercase;color:var(--bronze)}
.field input,.field select,.field textarea{background:var(--black);border:1px solid var(--line);padding:13px 14px;color:var(--cream);border-radius:2px;outline:none;transition:.2s;color-scheme:dark;width:100%}
.field input:focus,.field select:focus,.field textarea:focus{border-color:var(--bronze)}
.slots{display:grid;grid-template-columns:repeat(3,1fr);gap:10px;margin-bottom:20px}
.chip{border:1px solid var(--line);padding:12px 10px;text-align:center;transition:.2s;background:var(--black)}
.chip strong{display:block;font-family:var(--font-display);font-size:15px;letter-spacing:.06em}
.chip span{display:block;font-size:12px;color:var(--stone-light);margin-top:4px}
.chip:hover{border-color:var(--bronze)}
.chip.is-selected{background:var(--bronze);color:var(--black);border-color:var(--bronze)}
.chip.is-selected span{color:var(--black-3)}
.chip.is-low span{color:#D9A066}
.chip.is-selected.is-low span{color:var(--black-3)}
.chip.is-full{opacity:.4;cursor:not-allowed;text-decoration:line-through}
.slot-summary{display:flex;justify-content:space-between;align-items:center;gap:16px;padding-top:18px;border-top:1px solid var(--line);font-size:14px;color:var(--stone-light);flex-wrap:wrap}
.slot-summary strong{color:var(--cream);font-family:var(--font-display);letter-spacing:.06em}

/* =================== GIÁO DỤC =================== */
.program{padding:32px;border:1px solid var(--line);background:var(--black-2);position:relative;transition:.25s}
.program:hover{border-color:var(--bronze)}
.program .roman{font-family:var(--font-display);font-size:44px;color:var(--bronze);line-height:1;opacity:.85}
.program h3{font-size:21px;margin:18px 0 10px}
.program p{font-size:15px;color:var(--stone-light);margin-bottom:18px}
.program ul{font-size:14px;color:var(--cream-2);display:grid;gap:6px;margin-bottom:22px}
.program ul li::before{content:"— ";color:var(--bronze)}

/* =================== KẾ HOẠCH THAM QUAN =================== */
.plan{display:grid;grid-template-columns:1fr 1fr;gap:48px;align-items:center}
.plan .ph{aspect-ratio:4/5;border:1px solid var(--line);position:relative}
.plan .ph .cap{position:absolute;left:0;right:0;bottom:0;padding:26px 16px 12px;font-size:12px;letter-spacing:.06em;background:linear-gradient(0deg,rgba(20,18,15,.92),transparent)}
.tips li{display:grid;grid-template-columns:52px 1fr;gap:16px;padding:20px 0;border-bottom:1px solid var(--line)}
.tips li:first-child{border-top:1px solid var(--line)}
.tips .n{font-family:var(--font-display);font-size:24px;color:var(--bronze);line-height:1.2}
.tips strong{display:block;font-family:var(--font-display);font-size:15px;letter-spacing:.04em;margin-bottom:4px}
.tips span{font-size:15px;color:var(--stone-light)}

/* =================== FOOTER =================== */
.footer{background:#0E0C0A;border-top:1px solid var(--line);padding:70px 0 30px;color:var(--stone-light);font-size:14px}
.footer-grid{display:grid;grid-template-columns:1.4fr 1fr 1fr 1.3fr;gap:36px}
.footer h4{font-family:var(--font-display);font-size:12px;letter-spacing:.26em;text-transform:uppercase;color:var(--bronze);margin-bottom:18px}
.footer li{margin-bottom:9px}
.footer a:hover{color:var(--cream)}
.footer .brand{margin-bottom:16px}
.map-ph{aspect-ratio:16/10;border:1px solid var(--line);background:
  linear-gradient(rgba(176,138,76,.12) 1px,transparent 1px) 0 0/28px 28px,
  linear-gradient(90deg,rgba(176,138,76,.12) 1px,transparent 1px) 0 0/28px 28px,var(--black-2);position:relative;display:grid;place-items:center}
.map-ph::before{content:"";position:absolute;left:12%;top:60%;width:76%;height:2px;background:var(--bronze-dark);transform:rotate(-8deg);opacity:.6}
.map-ph::after{content:"";position:absolute;left:55%;top:0;width:2px;height:100%;background:var(--bronze-dark);opacity:.4}
.map-ph .pin{position:relative;z-index:1;width:16px;height:16px;border-radius:50% 50% 50% 0;background:var(--bronze);transform:rotate(-45deg);box-shadow:0 0 0 6px rgba(176,138,76,.2)}
.map-ph small{position:absolute;bottom:10px;left:12px;font-size:11px;letter-spacing:.1em;color:var(--stone)}
.footer-bottom{margin-top:48px;padding-top:22px;border-top:1px solid var(--line);display:flex;justify-content:space-between;gap:16px;flex-wrap:wrap;font-size:13px}
.hours-table{width:100%;border-collapse:collapse;font-size:14px}
.hours-table td{padding:6px 0;border-bottom:1px dashed rgba(176,138,76,.2)}
.hours-table td:last-child{text-align:right;color:var(--cream)}

/* =================== TRANG CON =================== */
.page-hero{position:relative;min-height:380px;display:flex;align-items:flex-end;padding:120px 0 56px;overflow:hidden}
.page-hero .ph{position:absolute;inset:0}
.page-hero::after{content:"";position:absolute;inset:0;background:linear-gradient(0deg,var(--black) 0%,rgba(20,18,15,.75) 50%,rgba(20,18,15,.5))}
.page-hero .container{position:relative;z-index:1}
.page-hero h1{font-size:clamp(36px,5vw,64px);max-width:16ch}
.page-hero p{margin-top:14px;font-size:18px;color:var(--cream-2)}
.crumbs{font-family:var(--font-display);font-size:11px;letter-spacing:.24em;text-transform:uppercase;color:var(--bronze);margin-bottom:16px}
.crumbs a{opacity:.7}.crumbs a:hover{opacity:1}

/* Lọc theo thời kỳ */
.filters{display:flex;gap:8px;flex-wrap:wrap;margin-bottom:30px}
.filters button{padding:10px 18px;border:1px solid var(--line);font-family:var(--font-display);font-size:11px;letter-spacing:.18em;text-transform:uppercase;color:var(--stone-light);transition:.2s}
.filters button:hover{border-color:var(--bronze);color:var(--cream)}
.filters button.is-active{background:var(--bronze);border-color:var(--bronze);color:var(--black)}
.is-hidden{display:none!important}
.empty{padding:40px;border:1px dashed var(--line);text-align:center;color:var(--stone-light)}

/* Trang hiện vật */
.artifact{display:grid;grid-template-columns:1.1fr 1fr;gap:56px;align-items:start}
.artifact-img{position:sticky;top:110px}
.artifact-img .main{aspect-ratio:4/5;border:1px solid var(--line);position:relative}
.artifact-img .main .cap{position:absolute;left:0;right:0;bottom:0;padding:26px 16px 12px;font-size:12px;letter-spacing:.06em;background:linear-gradient(0deg,rgba(20,18,15,.92),transparent)}
.artifact-img .thumbs{display:grid;grid-template-columns:repeat(4,1fr);gap:10px;margin-top:10px}
.artifact-img .thumbs .ph{aspect-ratio:1;border:1px solid var(--line);cursor:pointer;opacity:.7;transition:.2s}
.artifact-img .thumbs .ph:hover,.artifact-img .thumbs .ph.is-active{opacity:1;border-color:var(--bronze)}
.artifact h1{font-size:clamp(32px,4vw,52px);margin:8px 0 18px}
.artifact .lead{font-size:19px;color:var(--cream-2);margin-bottom:26px}
.dossier{width:100%;border-collapse:collapse;margin:26px 0;font-size:15px}
.dossier caption{font-family:var(--font-display);font-size:12px;letter-spacing:.28em;text-transform:uppercase;color:var(--bronze);text-align:left;padding-bottom:12px}
.dossier th,.dossier td{padding:12px 0;border-bottom:1px solid var(--line);text-align:left;vertical-align:top}
.dossier th{width:40%;font-weight:400;color:var(--stone-light);font-family:var(--font-display);font-size:12px;letter-spacing:.14em;text-transform:uppercase;padding-right:14px}
.story p{margin-bottom:16px;font-size:16px;color:var(--cream-2)}
.story p:first-of-type::first-letter{font-family:var(--font-display);font-size:60px;float:left;line-height:.8;padding:6px 10px 0 0;color:var(--bronze)}
.audio{display:flex;align-items:center;gap:18px;padding:20px 22px;background:var(--black-2);border:1px solid var(--bronze);margin:26px 0}
.audio .play{width:52px;height:52px;border-radius:50%;border:1px solid var(--bronze);color:var(--bronze);display:grid;place-items:center;font-size:18px;flex-shrink:0;transition:.2s}
.audio .play:hover,.audio.is-playing .play{background:var(--bronze);color:var(--black)}
.audio .mid{flex:1;min-width:0}
.audio .bar{height:2px;background:rgba(176,138,76,.3);position:relative;margin-top:10px}
.audio .bar i{position:absolute;left:0;top:0;bottom:0;width:0;background:var(--bronze);transition:width .5s linear}
.audio .t{font-family:var(--font-display);font-size:12px;letter-spacing:.1em;color:var(--stone-light);white-space:nowrap}
.audio strong{display:block;font-family:var(--font-display);font-size:13px;letter-spacing:.14em}
.audio small{font-size:12px;color:var(--stone-light)}

/* Trang triển lãm */
.exh-row{display:grid;grid-template-columns:1fr 1fr;border:1px solid var(--line);background:var(--black-2);margin-bottom:30px}
.exh-row .ph{min-height:380px;position:relative}
.exh-row .ph .cap{position:absolute;left:0;right:0;bottom:0;padding:26px 16px 12px;font-size:12px;letter-spacing:.06em;background:linear-gradient(0deg,rgba(20,18,15,.92),transparent)}
.exh-row.flip .ph{order:2}
.exh-body{padding:40px}
.exh-body h3{font-size:28px;margin:12px 0 14px}
.exh-body .dates{font-family:var(--font-display);font-size:12px;letter-spacing:.22em;color:var(--bronze)}
.exh-body p{font-size:15px;color:var(--stone-light);margin-bottom:12px}
.curator{margin:20px 0;padding:18px 22px;border-left:2px solid var(--bronze);background:var(--black);font-style:italic;color:var(--cream-2);font-size:15px}
.curator cite{display:block;font-style:normal;font-family:var(--font-display);font-size:11px;letter-spacing:.2em;color:var(--bronze);margin-top:10px}
.exh-meta{display:flex;gap:24px;flex-wrap:wrap;font-size:13px;color:var(--stone-light);margin:14px 0 22px}
.exh-meta b{color:var(--cream);font-weight:400}
.archive{width:100%;border-collapse:collapse;font-size:15px}
.archive th{text-align:left;font-family:var(--font-display);font-size:11px;letter-spacing:.2em;text-transform:uppercase;color:var(--bronze);padding:12px 10px;border-bottom:1px solid var(--bronze)}
.archive td{padding:14px 10px;border-bottom:1px solid var(--line);color:var(--cream-2);vertical-align:top}
.archive td:first-child{font-family:var(--font-display);color:var(--stone-light);white-space:nowrap}
.archive tr:hover td{background:rgba(176,138,76,.06)}
.table-wrap{overflow-x:auto}

/* Trang vé */
.price-table{width:100%;border-collapse:collapse;font-size:15px}
.price-table th{text-align:left;font-family:var(--font-display);font-size:11px;letter-spacing:.2em;text-transform:uppercase;color:var(--bronze);padding:14px 12px;border-bottom:1px solid var(--bronze)}
.price-table td{padding:16px 12px;border-bottom:1px solid var(--line);vertical-align:top}
.price-table td:last-child,.price-table th:last-child{text-align:right;white-space:nowrap}
.price-table .p{font-family:var(--font-display);font-size:18px;color:var(--bronze)}
.price-table small{display:block;color:var(--stone-light);font-size:13px}
.booking{display:grid;grid-template-columns:1.2fr .8fr;gap:40px;align-items:start}
.form-card{background:var(--black-2);border:1px solid var(--line);padding:34px}
.form-card h3{font-size:22px;margin-bottom:22px}
.form-row{display:grid;grid-template-columns:1fr 1fr;gap:18px}
.qty-row{display:grid;grid-template-columns:1fr 130px;gap:14px;align-items:center;padding:14px 0;border-bottom:1px solid var(--line)}
.qty-row label{font-size:15px}
.qty-row label small{display:block;color:var(--stone-light);font-size:13px}
.qty{display:grid;grid-template-columns:36px 1fr 36px;border:1px solid var(--line)}
.qty button{height:40px;color:var(--bronze);font-size:18px}
.qty button:hover{background:var(--bronze);color:var(--black)}
.qty input{text-align:center;background:var(--black);border:0;border-left:1px solid var(--line);border-right:1px solid var(--line);color:var(--cream);width:100%;-moz-appearance:textfield}
.qty input::-webkit-outer-spin-button,.qty input::-webkit-inner-spin-button{-webkit-appearance:none}
.summary{background:var(--black-2);border:1px solid var(--bronze);padding:30px;position:sticky;top:110px}
.summary h3{font-size:20px;margin-bottom:18px}
.summary ul li{display:flex;justify-content:space-between;gap:12px;padding:9px 0;border-bottom:1px dashed rgba(176,138,76,.25);font-size:14px;color:var(--stone-light)}
.summary ul li b{color:var(--cream);font-weight:400}
.summary .total{display:flex;justify-content:space-between;align-items:baseline;margin:20px 0}
.summary .total span{font-family:var(--font-display);font-size:12px;letter-spacing:.2em;text-transform:uppercase}
.summary .total strong{font-family:var(--font-display);font-size:30px;color:var(--bronze)}
.summary .btn{width:100%}
.rules{columns:2;column-gap:40px;font-size:15px;color:var(--cream-2)}
.rules li{break-inside:avoid;padding:10px 0 10px 26px;position:relative;border-bottom:1px solid var(--line)}
.rules li::before{content:"§";position:absolute;left:0;color:var(--bronze);font-family:var(--font-display)}

/* Trang tham quan */
.info-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:24px}
.info-card{padding:28px;border:1px solid var(--line);background:var(--black-2)}
.info-card h3{font-size:18px;margin-bottom:10px;display:flex;align-items:center;gap:12px}
.info-card h3::before{content:"";width:10px;height:10px;background:var(--bronze);transform:rotate(45deg);flex-shrink:0}
.info-card p,.info-card li{font-size:15px;color:var(--stone-light)}
.info-card li{padding:6px 0;border-bottom:1px dashed rgba(176,138,76,.2)}
.route{display:grid;grid-template-columns:1fr 1fr;gap:40px;align-items:start}
.route .map-ph{aspect-ratio:4/3}
.faq details{border-bottom:1px solid var(--line)}
.faq summary{cursor:pointer;padding:20px 0;font-family:var(--font-display);font-size:15px;letter-spacing:.04em;list-style:none;display:flex;justify-content:space-between;gap:16px}
.faq summary::-webkit-details-marker{display:none}
.faq summary::after{content:"+";color:var(--bronze);font-size:22px;line-height:1}
.faq details[open] summary::after{content:"–"}
.faq details p{padding:0 0 20px;color:var(--stone-light);font-size:15px}

/* Dải CTA */
.cta{background:var(--bronze);color:var(--black);padding:60px 0}
.cta .container{display:flex;justify-content:space-between;align-items:center;gap:24px;flex-wrap:wrap}
.cta h2{font-size:clamp(24px,3vw,36px)}
.cta p{color:#3E2E14;margin-top:6px}
.cta .btn{border-color:var(--black);color:var(--black)}
.cta .btn:hover{background:var(--black);color:var(--cream)}

/* =================== RESPONSIVE =================== */
@media (max-width:1100px){
  .hero{grid-template-columns:1fr 300px}
  .hero-body h1{font-size:clamp(40px,6vw,72px)}
  .footer-grid{grid-template-columns:1fr 1fr}
  .era{flex-basis:360px}
  .artifact{gap:36px}
  .nav{gap:20px}
}
@media (max-width:980px){
  .nav{position:fixed;top:0;right:0;bottom:0;width:min(320px,86vw);background:#0E0C0A;flex-direction:column;align-items:flex-start;padding:100px 34px;gap:22px;transform:translateX(100%);transition:.3s;border-left:1px solid var(--line);z-index:60}
  .nav.is-open{transform:none}
  .nav a{font-size:14px}
  .burger{display:flex;position:relative;z-index:70}
  .header-cta .btn{display:none}
  .hero{grid-template-columns:1fr;min-height:auto}
  .hero-body{padding:90px 0 40px}
  .hero-body .container{padding-right:0}
  .rail{border-left:0;border-top:1px solid var(--line);flex-direction:row;flex-wrap:wrap;padding:0}
  .rail-title{width:100%;padding:20px 4% 6px}
  .rail a{flex:1 1 50%;border-top:1px solid rgba(176,138,76,.22);padding:18px 4%}
  .floors,.tickets,.plan,.artifact,.booking,.route{grid-template-columns:1fr}
  .artifact-img,.summary,.room-info{position:static}
  .grid-3{grid-template-columns:1fr 1fr}
  .info-grid{grid-template-columns:1fr 1fr}
  .exh-row{grid-template-columns:1fr}
  .exh-row.flip .ph{order:0}
  .exh-row .ph{min-height:260px}
  .section{padding:72px 0}
}
@media (max-width:640px){
  body{font-size:16px}
  .topline .container{flex-direction:column;align-items:flex-start;padding:8px 0;gap:6px}
  .topline-left{gap:12px;font-size:12px}
  .brand-name{font-size:14px}
  .brand-name small{display:none}
  .hero-body h1{font-size:40px}
  .hero-body p{font-size:17px}
  .hero-meta{gap:20px;flex-wrap:wrap}
  .rail a{flex-basis:100%}
  .era{flex-basis:84vw}
  .tick{font-size:9px;letter-spacing:.04em}
  .grid-3,.grid-2,.info-grid{grid-template-columns:1fr}
  .special{min-height:360px}
  .special-body{padding:24px}
  .slots{grid-template-columns:1fr 1fr}
  .form-row{grid-template-columns:1fr}
  .footer-grid{grid-template-columns:1fr}
  .rules{columns:1}
  .floor-tabs{overflow-x:auto}
  .floor-tabs button{padding:12px 14px;white-space:nowrap}
  .exh-body,.form-card,.summary,.slot-box,.room-info{padding:22px}
  .ticket{grid-template-columns:1fr}
  .ticket .price small{text-align:left}
  .dossier th{width:45%}
  .tips li{grid-template-columns:40px 1fr}
  .qty-row{grid-template-columns:1fr 120px}
}

/* =================== BỔ SUNG TRANG CON =================== */
.highlights{margin-top:16px;font-size:14px}
.highlights li{padding:12px 0;grid-template-columns:28px 1fr}
.highlights .n{font-size:16px;line-height:1.4}
.exh-body>.link{display:inline-block;margin-top:18px}
.btn:disabled{opacity:.45;cursor:not-allowed}
.btn:disabled:hover{background:var(--bronze);color:var(--black)}
.form-card h3+.field{margin-top:4px}
.page-hero .crumbs a{color:var(--cream-2)}