/* =========================================================================
   GIAO DIỆN — Sài Gòn 1898
   Phong cách: tập bản đồ / thạch bản cổ. Mobile-first.
   ========================================================================= */

:root{
  --ink:        #2b2117;   /* mực nâu đen   */
  --ink-soft:   #5a4d3a;
  --paper:      #f4ecd8;   /* giấy ngả vàng */
  --paper-2:    #eaddc0;
  --terra:      #b14a2e;   /* đỏ ngói (nhấn) */
  --teal:       #1f5e5b;   /* xanh sông     */
  --teal-deep:  #16302e;
  --gold:       #c2922e;   /* vàng đồng     */
  --line:       rgba(43,33,23,.22);
  --line-strong:rgba(43,33,23,.40);
  --shadow:     0 18px 50px rgba(20,30,28,.45);
  --bg:         #11201e;   /* nền sau bức tranh */
  --font-display:"Cormorant Garamond", Georgia, "Times New Roman", serif;
  --font-body:   "Lora", Georgia, serif;
}

*{ box-sizing:border-box; }
html,body{ height:100%; margin:0; }
body{
  font-family:var(--font-body);
  color:var(--ink);
  background:var(--bg);
  overflow:hidden;
  -webkit-text-size-adjust:100%;
}

/* ---------- Khung xem tranh (OpenSeadragon) ---------- */
#viewer{
  position:fixed; inset:0;
  background:
    radial-gradient(120% 120% at 50% 0%, #1c3a37 0%, var(--bg) 70%);
}
/* vignette nhẹ tạo chiều sâu quanh mép */
#viewer::after{
  content:""; position:fixed; inset:0; pointer-events:none; z-index:5;
  box-shadow: inset 0 0 180px rgba(8,14,13,.65);
}

/* ---------- Thanh trên cùng ---------- */
.topbar{
  position:fixed; top:0; left:0; right:0; z-index:30;
  display:flex; align-items:center; gap:12px;
  padding:10px 14px;
  background:linear-gradient(180deg, rgba(17,32,30,.85) 0%, rgba(17,32,30,0) 100%);
  pointer-events:none;
}
.brand{ pointer-events:auto; line-height:1; }
.brand h1{
  font-family:var(--font-display);
  font-weight:600; font-size:26px; letter-spacing:.5px;
  margin:0; color:var(--paper);
  text-shadow:0 2px 8px rgba(0,0,0,.5);
}
.brand p{
  margin:2px 0 0; font-size:12px; letter-spacing:2px; text-transform:uppercase;
  color:var(--gold);
}
.spacer{ flex:1; }
.lang-btn{
  pointer-events:auto;
  font-family:var(--font-display); font-weight:600; font-size:16px;
  color:var(--paper); background:rgba(20,32,30,.55);
  border:1px solid rgba(244,236,216,.35);
  border-radius:999px; padding:7px 16px; cursor:pointer;
  backdrop-filter:blur(4px); transition:background .2s, border-color .2s;
}
.lang-btn:hover{ background:var(--terra); border-color:var(--terra); }

/* ---------- Cụm nút điều khiển zoom ---------- */
.controls{
  position:fixed; right:14px; bottom:18px; z-index:30;
  display:flex; flex-direction:column; gap:8px;
}
.ctrl{
  width:46px; height:46px; border-radius:12px; cursor:pointer;
  display:flex; align-items:center; justify-content:center;
  background:rgba(244,236,216,.92); color:var(--ink);
  border:1px solid var(--line-strong);
  font-size:22px; line-height:1; font-family:var(--font-display);
  box-shadow:0 6px 18px rgba(0,0,0,.35);
  transition:transform .12s, background .2s;
}
.ctrl:hover{ background:#fff; transform:translateY(-1px); }
.ctrl:active{ transform:translateY(0); }
.ctrl svg{ width:22px; height:22px; }

/* ---------- Mini-map (navigator của OpenSeadragon) ---------- */
.navigator-wrap{
  position:fixed; left:14px; bottom:18px; z-index:25;
  width:168px; height:120px;
  border:2px solid rgba(244,236,216,.6);
  border-radius:8px; overflow:hidden;
  box-shadow:0 8px 22px rgba(0,0,0,.4);
}

/* ---------- Hotspot (chấm địa điểm) ---------- */
.hotspot{
  position:relative; width:26px; height:26px; cursor:pointer;
  transform:translate(-50%,-50%);
}
.hotspot .dot{
  position:absolute; inset:8px; border-radius:50%;
  background:var(--terra);
  border:2px solid var(--paper);
  box-shadow:0 0 0 2px rgba(177,74,46,.5), 0 2px 6px rgba(0,0,0,.5);
}
.hotspot .pulse{
  position:absolute; inset:0; border-radius:50%;
  border:2px solid var(--gold);
  animation:pulse 2.4s ease-out infinite; opacity:0;
}
@keyframes pulse{
  0%{ transform:scale(.5); opacity:.9; }
  100%{ transform:scale(1.6); opacity:0; }
}
.hotspot .tag{
  position:absolute; left:50%; top:-8px; transform:translate(-50%,-100%);
  white-space:nowrap; font-family:var(--font-display); font-weight:600;
  font-size:14px; color:var(--ink);
  background:rgba(244,236,216,.96); padding:3px 10px; border-radius:6px;
  border:1px solid var(--line-strong);
  opacity:0; transition:opacity .18s; pointer-events:none;
  box-shadow:0 4px 12px rgba(0,0,0,.3);
}
.hotspot:hover .tag, .hotspot.show-tag .tag{ opacity:1; }
.hotspot:hover .dot{ background:var(--gold); }

/* ---------- Lớp chào mừng ---------- */
.intro{
  position:fixed; inset:0; z-index:60;
  display:flex; align-items:center; justify-content:center;
  background:radial-gradient(120% 120% at 50% 40%, rgba(17,32,30,.55), rgba(11,20,18,.92));
  backdrop-filter:blur(2px);
  transition:opacity .5s;
}
.intro.hide{ opacity:0; pointer-events:none; }
.intro-card{
  max-width:440px; margin:20px; text-align:center;
  background:var(--paper);
  border:1px solid var(--line-strong);
  border-radius:14px; padding:34px 30px;
  box-shadow:var(--shadow);
  position:relative;
}
.intro-card::before{
  content:""; position:absolute; inset:8px; border:1px solid var(--gold);
  border-radius:9px; pointer-events:none; opacity:.55;
}
.intro-eyebrow{
  font-size:12px; letter-spacing:3px; text-transform:uppercase; color:var(--terra);
  margin:0 0 6px;
}
.intro-card h2{
  font-family:var(--font-display); font-weight:600; font-size:32px;
  margin:0 0 12px; color:var(--ink); line-height:1.1;
}
.intro-card p{ font-size:16px; line-height:1.6; color:var(--ink-soft); margin:0 0 22px; }
.intro-start{
  font-family:var(--font-display); font-weight:600; font-size:18px;
  background:var(--terra); color:var(--paper); border:none; cursor:pointer;
  padding:12px 28px; border-radius:999px; transition:background .2s, transform .12s;
}
.intro-start:hover{ background:#933a22; transform:translateY(-1px); }

/* ---------- Gợi ý nổi ---------- */
.hint{
  position:fixed; left:50%; top:64px; transform:translateX(-50%);
  z-index:25; font-size:13px; color:var(--paper);
  background:rgba(20,32,30,.6); padding:6px 14px; border-radius:999px;
  border:1px solid rgba(244,236,216,.25);
  opacity:0; transition:opacity .4s; pointer-events:none;
}
.hint.show{ opacity:1; }

/* ---------- Panel thông tin ---------- */
.panel-backdrop{
  position:fixed; inset:0; z-index:40; background:rgba(11,20,18,.35);
  opacity:0; pointer-events:none; transition:opacity .3s;
}
.panel-backdrop.show{ opacity:1; pointer-events:auto; }

.panel{
  position:fixed; z-index:50;
  background:var(--paper);
  display:flex; flex-direction:column;
  box-shadow:var(--shadow);
  transition:transform .42s cubic-bezier(.22,.61,.36,1);
}
/* Mobile: trượt từ dưới lên */
.panel{
  left:0; right:0; bottom:0; max-height:86vh;
  border-radius:18px 18px 0 0;
  transform:translateY(105%);
}
.panel.open{ transform:translateY(0); }

.panel-grip{
  width:42px; height:5px; border-radius:999px; background:var(--line-strong);
  margin:10px auto 4px; flex:none;
}
.panel-head{
  padding:6px 22px 14px; border-bottom:1px solid var(--line); position:relative;
}
.panel-cat{
  font-size:11px; letter-spacing:2px; text-transform:uppercase;
  color:var(--terra); margin:0 0 4px;
}
.panel-title{
  font-family:var(--font-display); font-weight:600; font-size:28px;
  margin:0; line-height:1.1; color:var(--ink); padding-right:40px;
}
.panel-year{ font-size:14px; color:var(--ink-soft); margin:4px 0 0; }
.panel-year b{ color:var(--ink); font-weight:600; }
.panel-close{
  position:absolute; top:0; right:18px;
  width:34px; height:34px; border-radius:50%; cursor:pointer;
  border:1px solid var(--line-strong); background:transparent; color:var(--ink);
  font-size:20px; line-height:1; display:flex; align-items:center; justify-content:center;
}
.panel-close:hover{ background:var(--paper-2); }

.panel-body{ padding:16px 22px 26px; overflow-y:auto; }
.panel-short{ font-size:16px; line-height:1.65; margin:0 0 14px; color:var(--ink); }
.panel-long{
  font-size:15px; line-height:1.7; color:var(--ink-soft);
  margin:0; max-height:0; overflow:hidden; transition:max-height .35s ease;
}
.panel-long.open{ max-height:1200px; }
.read-toggle{
  background:none; border:none; cursor:pointer; padding:6px 0;
  font-family:var(--font-body); font-size:14px; color:var(--terra);
  text-decoration:underline; text-underline-offset:3px;
}

/* So sánh xưa–nay */
.compare-block{ margin:20px 0 8px; }
.compare-heading{
  font-family:var(--font-display); font-weight:600; font-size:20px;
  margin:0 0 4px; color:var(--ink);
}
.compare-sub{ font-size:12px; color:var(--ink-soft); margin:0 0 10px; }
.compare{
  position:relative; width:100%; aspect-ratio:4/3; user-select:none;
  border-radius:10px; overflow:hidden; border:1px solid var(--line-strong);
  background:var(--paper-2); touch-action:none;
}
.compare img{
  position:absolute; inset:0; width:100%; height:100%; object-fit:cover;
  display:block; pointer-events:none;
}
.compare .img-now{ z-index:1; }
.compare .img-then{ z-index:2; }   /* ảnh 1898 ở trên, bị cắt bằng clip-path */
.compare .label{
  position:absolute; bottom:10px; z-index:4;
  font-family:var(--font-display); font-weight:600; font-size:14px;
  color:var(--paper); padding:3px 10px; border-radius:6px;
}
.compare .label.then{ left:10px; background:rgba(43,33,23,.8); }
.compare .label.now{ right:10px; background:var(--terra); }
.compare .divider{
  position:absolute; top:0; bottom:0; z-index:3; width:2px;
  background:var(--paper); transform:translateX(-1px); pointer-events:none;
  box-shadow:0 0 0 1px rgba(0,0,0,.3);
}
.compare .handle{
  position:absolute; top:50%; z-index:5; width:38px; height:38px;
  transform:translate(-50%,-50%); border-radius:50%;
  background:var(--paper); border:2px solid var(--ink);
  display:flex; align-items:center; justify-content:center; cursor:ew-resize;
  box-shadow:0 3px 10px rgba(0,0,0,.4);
}
.compare .handle::before{ content:"\u2039 \u203A"; font-size:15px; color:var(--ink); letter-spacing:-1px; }

.sources{ margin-top:18px; padding-top:14px; border-top:1px solid var(--line); }
.sources h4{
  font-size:11px; letter-spacing:2px; text-transform:uppercase;
  color:var(--ink-soft); margin:0 0 6px;
}
.sources a{ display:block; font-size:13px; color:var(--teal); word-break:break-all; margin:2px 0; }

/* Footer ghi nguồn */
.credit{
  position:fixed; left:50%; bottom:2px; transform:translateX(-50%); z-index:20;
  font-size:10px; color:rgba(244,236,216,.5); text-align:center; max-width:90vw;
  pointer-events:none;
}

/* ---------- Máy tính (màn hình rộng): panel trượt từ phải ---------- */
@media (min-width:760px){
  .panel{
    top:0; bottom:0; right:0; left:auto;
    width:420px; max-height:none;
    border-radius:0; transform:translateX(105%);
  }
  .panel.open{ transform:translateX(0); }
  .panel-grip{ display:none; }
  .panel-head{ padding-top:64px; }
  .navigator-wrap{ left:14px; bottom:14px; }
}

/* Tôn trọng người tắt hiệu ứng chuyển động */
@media (prefers-reduced-motion:reduce){
  .hotspot .pulse{ animation:none; }
  .panel{ transition:none; }
}

/* ---------- Chế độ căn vị trí ---------- */
.calib-on .hotspot{ cursor:move; }
.calib-on .hotspot .dot{ background:var(--gold); }
#calib-panel{
  position:fixed; left:14px; top:62px; z-index:80; width:300px; max-width:86vw;
  background:rgba(20,32,30,.96); color:var(--paper);
  border:1px solid rgba(244,236,216,.3); border-radius:10px; padding:12px;
  box-shadow:0 10px 30px rgba(0,0,0,.5); font-family:var(--font-body);
}
.cp-head{ font-size:13px; line-height:1.4; margin-bottom:8px; }
#cp-list{
  font:12px/1.5 ui-monospace, monospace; background:rgba(0,0,0,.35);
  padding:8px; border-radius:6px; max-height:230px; overflow:auto;
  white-space:pre; margin:0 0 10px; color:#fff;
}
.cp-actions{ display:flex; gap:8px; }
.cp-actions button{
  flex:1; cursor:pointer; font-family:var(--font-body); font-size:13px;
  padding:8px 10px; border-radius:7px; color:var(--paper);
  border:1px solid rgba(244,236,216,.3); background:var(--terra);
}
.cp-actions #cp-close{ background:transparent; }