/* ============================================================
   光的收藏柜 · design system
   1 tokens / 2 base / 3 header / 4 intro / 5 room / 6 shelf
   7 viewer / 8 dialogs / 9 feedback / 10 responsive
   ============================================================ */

/* ---------- 1 tokens ---------- */
:root{
  color-scheme:light;
  --paper:#f2efe6;
  --paper-hi:#faf8f2;
  --ink:#2b2820;
  --ink-2:#57513f;
  --ink-3:#6f6753;
  --line:rgba(64,52,32,.16);
  --line-soft:rgba(64,52,32,.08);
  --wood:#96683c;
  --gold:#a9803c;
  --gold-deep:#8a6329;
  --olive:#3a4432;
  --serif:"Songti SC","Noto Serif SC","Source Han Serif SC","STSong",Georgia,"SimSun",serif;
  --sans:"PingFang SC","HarmonyOS Sans SC","Microsoft YaHei",system-ui,-apple-system,"Segoe UI",sans-serif;
  --mono:ui-monospace,"SF Mono",Consolas,"Courier New",monospace;
  --frame-w:340px;
  --frame-h:228px;
  --ease:cubic-bezier(.22,.61,.36,1);
  --ease-out:cubic-bezier(.16,1,.3,1);
}

/* ---------- 2 base ---------- */
*{box-sizing:border-box}
[hidden]{display:none!important}
html{height:100%;background:var(--paper)}
body{
  margin:0;height:100dvh;display:flex;flex-direction:column;overflow:hidden;
  background:transparent;isolation:isolate;
  color:var(--ink);font-family:var(--sans);
  -webkit-font-smoothing:antialiased;text-rendering:optimizeLegibility;
}
/* 极淡的纸面颗粒，让整页有质感而不是一块纯色 */
body::after{
  content:'';position:fixed;inset:0;z-index:9998;pointer-events:none;opacity:.032;
  mix-blend-mode:multiply;
  background-image:url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='140' height='140'%3E%3Cfilter id='n'%3E%3CfeTurbulence type='fractalNoise' baseFrequency='.85' numOctaves='3'/%3E%3C/filter%3E%3Crect width='140' height='140' filter='url(%23n)'/%3E%3C/svg%3E");
}
::selection{background:rgba(169,128,60,.26)}
button,select,input{font:inherit;color:inherit}
button{cursor:pointer;background:none;border:0;padding:0}
:focus-visible{outline:2px solid var(--gold);outline-offset:4px;border-radius:2px}
#roomBackdrop{
  position:fixed;inset:0;width:100%;height:100%;z-index:-1;pointer-events:none;
  transition:filter .45s var(--ease),transform .45s var(--ease);
}
main{
  flex:1;min-height:0;display:grid;
  grid-template-rows:auto auto minmax(0,1fr) auto;
  position:relative;z-index:1;
}

/* ---------- 3 header ---------- */
header{
  flex:none;height:66px;display:flex;align-items:center;justify-content:space-between;
  padding:0 clamp(20px,4.2vw,60px);position:relative;z-index:5;
}
header::after{
  content:'';position:absolute;left:0;right:0;bottom:0;height:1px;
  background:linear-gradient(90deg,transparent,var(--line) 10%,var(--line) 90%,transparent);
}
.brand{
  display:flex;align-items:center;gap:13px;flex:none;text-decoration:none;color:var(--ink);
  font-size:26px;line-height:1;
}
.brand svg{width:26px;height:26px;flex:none;color:var(--gold-deep);transition:transform .5s var(--ease-out)}
.brand:hover svg{transform:rotate(90deg)}
.brand span{display:block;font-family:var(--serif);font-size:17px;letter-spacing:.2em;line-height:1}
.brand small{
  display:block;white-space:nowrap;font-family:var(--sans);font-size:8px;font-weight:400;
  letter-spacing:.3em;color:var(--ink-3);margin-top:8px;padding-left:.1em;
}
.home-actions{display:flex;align-items:center;gap:8px;flex:none}
.outline,.text-button,.return-button{white-space:nowrap}
.outline{
  border:1px solid var(--line);background:rgba(255,255,255,.5);
  padding:11px 20px;border-radius:999px;font-size:12px;letter-spacing:.04em;color:var(--ink-2);
  transition:background .25s var(--ease),color .25s var(--ease),border-color .25s var(--ease),box-shadow .25s var(--ease),transform .25s var(--ease);
}
.outline:hover{background:#fff;color:var(--ink);border-color:rgba(64,52,32,.3);box-shadow:0 8px 22px rgba(60,45,25,.09);transform:translateY(-1px)}
.outline:active{transform:translateY(0)}
.text-button{
  padding:10px 12px;font-size:12px;letter-spacing:.04em;color:var(--ink-3);
  border-radius:999px;transition:color .2s var(--ease),background .2s var(--ease);
}
.text-button:hover{color:var(--ink);background:rgba(255,255,255,.5)}

/* ---------- 4 intro ---------- */
.intro{text-align:center;padding:clamp(4px,1.4vh,16px) 24px 0}
.eyebrow{
  margin:0;font-size:9.5px;letter-spacing:.42em;text-transform:uppercase;
  color:var(--gold-deep);font-weight:500;
}
.intro h1{
  font-family:var(--serif);font-weight:400;font-size:clamp(24px,3.2vh,34px);
  letter-spacing:.13em;margin:13px 0 10px;text-indent:.13em;
}
.intro>p:last-child{
  margin:0;color:var(--ink-3);font-size:11.5px;letter-spacing:.2em;
}
.collection-tools{
  height:30px;display:flex;align-items:center;justify-content:center;gap:18px;
  margin:9px auto 0;font-size:9.5px;letter-spacing:.13em;color:#7d7663;
  position:relative;z-index:2;
}
.collection-tools>div{display:flex;align-items:center;gap:10px}
.collection-tools .text-button{padding:6px 10px;font-size:10px;letter-spacing:.14em}
#overflowRolls{display:flex;gap:6px;max-width:42vw;overflow-x:auto;scrollbar-width:none}
#overflowRolls::-webkit-scrollbar{display:none}
#overflowRolls .text-button{white-space:nowrap;border:1px solid var(--line-soft);border-radius:999px;padding:5px 10px;font-size:9px}

/* ---------- 5 room ---------- */
.room-wrap{
  position:relative;display:flex;flex-direction:column;align-items:center;justify-content:center;
  min-height:0;padding:0 8px 4px;
}
.room{
  position:relative;width:100%;height:100%;flex:none;overflow:hidden;
  background:none;isolation:isolate;
}
#collection{position:absolute;display:block}
.room-note{
  width:100%;max-width:1120px;display:flex;justify-content:space-between;align-items:baseline;
  margin:0;padding:11px clamp(4px,1.4vw,18px) 0;
  font-size:9px;letter-spacing:.22em;color:#544d3c;text-transform:uppercase;
  text-shadow:0 1px 3px rgba(255,255,255,.4);
}
.room-note span:last-child{text-transform:none;letter-spacing:.14em;color:#544d3c;transition:color .3s var(--ease)}
footer{
  flex:none;height:52px;display:flex;align-items:flex-end;justify-content:center;
  padding-bottom:12px;font-size:9px;letter-spacing:.3em;color:var(--ink-3);
  background:linear-gradient(180deg,rgba(242,239,230,0),rgba(242,239,230,.9) 58%,var(--paper) 100%);
}

/* ---------- 6 shelf (cartridge slots) ---------- */
/* 3D 模块把胶卷渲染成 360×460 的 PNG：罐体在 (82,72)-(268,404)，
   右侧那块片头在缩略尺寸下会糊成一块脏色，底部还有 12% 透明留白。
   这里按罐体精确裁切，让底边正好落在层板上。 */
.realistic{transform-style:flat}
.roll-button .cartridge{height:100%;width:100%}
.cartridge.realistic{
  position:relative;overflow:hidden;margin:0 auto;
  aspect-ratio:186/332;height:100%;width:auto;
}
.cartridge.realistic img,.cartridge.realistic canvas{
  position:absolute;display:block;max-width:none;
  width:193.55%;height:138.55%;left:-44.09%;top:-21.69%;
  object-fit:fill;
}
.roll-slot{
  position:absolute;
  left:var(--slot-left);top:var(--slot-top);
  width:var(--slot-width);height:var(--slot-h);
  display:flex;align-items:center;justify-content:center;
}
/* 按钮就是罐体本身：尺寸由高度推出来，虚线框和删除钮才能严丝合缝地贴住它 */
.roll-button{
  position:relative;height:100%;width:auto;aspect-ratio:186/332;
  display:block;border:0;background:none;padding:0;
  filter:drop-shadow(4px 10px 6px rgba(40,28,14,.28));
  transition:filter .35s var(--ease);
}
/* 手机上罐体只有 30 多像素宽，用一个透明伪元素把可点区域撑到 44px 以上 */
.roll-button::before{content:'';position:absolute;inset:-10px -7px;border-radius:10px}
.roll-button .mini{transition:translate .45s var(--ease-out)}
.roll-button:hover,.roll-button:focus-visible{filter:drop-shadow(6px 16px 12px rgba(40,28,14,.34))}
.roll-button:hover .mini,.roll-button:focus-visible .mini{translate:0 -9px}
.roll-button::after{
  content:attr(data-name);position:absolute;left:50%;bottom:-4px;translate:-50% 4px;
  padding:4px 8px;border-radius:3px;white-space:nowrap;
  font-family:var(--mono);font-size:8px;letter-spacing:.1em;color:#4a3a22;
  background:rgba(250,246,235,.92);box-shadow:0 2px 10px rgba(50,35,15,.2);
  opacity:0;transition:opacity .25s var(--ease),translate .25s var(--ease);pointer-events:none;
}
.roll-button:hover::after,.roll-button:focus-visible::after{opacity:1;translate:-50% 0}
.roll-button.selected{opacity:0;transition:opacity .2s}
.delete-roll{
  position:absolute;top:-7px;right:-7px;z-index:8;
  width:24px;height:24px;border-radius:50%;font-size:15px;line-height:1;
  background:rgba(250,246,236,.95);color:#7d5236;border:1px solid rgba(255,255,255,.9);
  box-shadow:0 3px 12px rgba(70,45,20,.22);
  transition:transform .2s var(--ease),background .2s var(--ease);
}
.delete-roll:hover{background:#fff;transform:scale(1.08)}
.roll-slot:has(.delete-roll) .roll-button{outline:1px dashed rgba(255,255,255,.7);outline-offset:5px;border-radius:9px}

/* ---------- 7 viewer ---------- */
#rollDialog{
  position:fixed;inset:0;margin:0;padding:0;width:100%;height:100dvh;max-width:none;max-height:none;
  border:0;background:transparent;color:var(--ink);overflow:hidden;
}
#rollDialog[open]{display:grid;grid-template-rows:auto minmax(0,1fr) auto;gap:0}
/* 遮罩不再瞬间压上来：淡入即可，模糊交给页面自身的退焦，避免开始时闪一下 */
#rollDialog::backdrop{background-color:rgba(243,240,232,.62)}
/* 淡入只动 opacity，走合成器；动 background-color 会每帧在主线程重绘 */
#rollDialog[open]::backdrop{animation:scrimIn .5s var(--ease) both}
@keyframes scrimIn{from{opacity:0}to{opacity:1}}
#rollDialog:open{padding:clamp(18px,3.2vh,34px) clamp(18px,4vw,58px) clamp(16px,2.6vh,28px)}

.viewer-head{
  display:flex;align-items:flex-start;justify-content:space-between;gap:20px;
}
.viewer-title{padding-top:4px}
.viewer-title .eyebrow{font-size:8.5px;letter-spacing:.34em}
#rollTitle{
  font-family:var(--serif);font-weight:400;font-size:clamp(18px,2.4vh,24px);
  letter-spacing:.12em;margin:9px 0 0;
}
.gesture-note{
  margin:11px 0 0;font-size:10.5px;letter-spacing:.07em;line-height:1.7;
  color:#5c5645;transition:opacity .34s var(--ease);
}
.return-button{
  display:inline-flex;align-items:center;gap:14px;flex:none;
  padding:12px 20px;border-radius:999px;min-height:44px;
  border:1px solid rgba(255,255,255,.85);background:rgba(255,255,253,.6);
  backdrop-filter:blur(16px);-webkit-backdrop-filter:blur(16px);
  font-size:12px;letter-spacing:.06em;color:var(--ink-2);
  box-shadow:0 6px 22px rgba(50,40,22,.08);
  transition:background .25s var(--ease),transform .25s var(--ease),box-shadow .25s var(--ease);
}
.return-button:hover{background:rgba(255,255,255,.95);transform:translateY(-1px);box-shadow:0 10px 26px rgba(50,40,22,.12)}
.return-button kbd{
  font-family:var(--mono);font-size:9px;color:var(--ink-3);
  border:1px solid var(--line);border-radius:4px;padding:2px 5px;background:rgba(255,255,255,.6);
}

.unroll-stage{
  --cart-w:clamp(112px,13.5vw,186px);
  position:relative;margin:0;touch-action:pan-y;cursor:ew-resize;
}
.floating{
  position:absolute;left:0;top:50%;width:var(--cart-w);height:calc(var(--cart-w) / 0.5602);
  transform:translateY(-50%);
  will-change:translate,scale,rotate;z-index:4;
}
.floating .leader{display:none}
.float-shadow{
  position:absolute;left:-8%;top:calc(50% + var(--cart-w) / 1.14);width:116%;height:26px;
  background:radial-gradient(closest-side,rgba(46,32,14,.34),rgba(46,32,14,.12) 54%,transparent 78%);
  filter:blur(7px);z-index:3;opacity:1;transition:opacity .6s var(--ease);
}
.opening .float-shadow{opacity:0;transition:none}
.film-exit{
  position:absolute;left:calc(var(--cart-w) - 11px);top:50%;translate:0 -50%;
  width:16px;height:calc(var(--frame-h) - 30px);z-index:3;
  background:linear-gradient(90deg,#16130d,#2c2013 55%,#3a2a19);
  border-radius:2px;box-shadow:inset 0 0 8px rgba(0,0,0,.6),0 0 0 1px rgba(0,0,0,.25);
  transition:opacity .34s var(--ease);
}
#rollDialog:not(.has-film) .film-exit{opacity:0}
.film-window{
  position:absolute;left:calc(var(--cart-w) - 2px);right:0;top:50%;translate:0 -50%;
  height:var(--frame-h);overflow:hidden;
  mask-image:linear-gradient(90deg,#000 94%,transparent);
  -webkit-mask-image:linear-gradient(90deg,#000 94%,transparent);
  transition:opacity .34s var(--ease);
}
#rollDialog.opening .film-window{opacity:0;transition:none}
.film-track{position:absolute;left:0;top:0;height:var(--frame-h);display:flex;will-change:transform}
.film-frame{
  position:relative;flex:0 0 var(--frame-w);width:var(--frame-w);height:var(--frame-h);
  background:linear-gradient(180deg,#2b1e12,#241a10);
  padding:22px 11px;box-shadow:inset 0 0 22px rgba(0,0,0,.55);
}
.film-frame::before,.film-frame::after{
  content:'';position:absolute;left:0;right:0;height:11px;
  background-image:url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='26' height='11'%3E%3Crect x='4' y='1.5' width='10' height='8' rx='2.2' fill='%23ece7d6'/%3E%3C/svg%3E");
  background-repeat:repeat-x;background-size:26px 11px;opacity:.94;
}
.film-frame::before{top:5px}
.film-frame::after{bottom:5px}
.film-frame button{
  display:block;width:100%;height:100%;padding:0;border:0;background:#120d08;overflow:hidden;
  box-shadow:0 0 0 1px rgba(0,0,0,.55),0 8px 18px rgba(0,0,0,.3);
}
.film-frame img{display:block;width:100%;height:100%;object-fit:cover;transition:transform .7s var(--ease-out)}
.film-frame button:hover img{transform:scale(1.03)}
.edge-text{
  position:absolute;top:7px;left:12px;right:12px;display:flex;justify-content:space-between;
  font-family:var(--mono);font-size:7.5px;letter-spacing:.09em;color:#c8a35c;
  text-transform:uppercase;pointer-events:none;
}
.edge-text.bottom{top:auto;bottom:7px}
/* 空暗盒时，用一条虚线框标出「胶片将来的位置」，让空状态也是设计的一部分 */
.empty-hint{
  position:absolute;left:calc(var(--cart-w) + 18px);right:0;top:50%;translate:0 -50%;margin:0;
  height:var(--frame-h);display:flex;flex-direction:column;align-items:center;justify-content:center;
  gap:2px;border:1px dashed rgba(88,72,44,.17);border-radius:3px;
  background:linear-gradient(180deg,rgba(255,253,247,.2),rgba(255,253,247,.05));
  font-family:var(--serif);font-size:17px;line-height:1.9;letter-spacing:.14em;
  color:#4a4335;text-shadow:0 1px 12px rgba(255,255,255,.9);pointer-events:none;
  transition:opacity .34s var(--ease);
}
.empty-hint span{
  font-family:var(--sans);font-size:9.5px;letter-spacing:.14em;color:#6b6353;
}
#rollDialog.opening .empty-hint{opacity:0;transition:none}

.viewer-foot{
  display:grid;grid-template-columns:1fr auto 1fr;align-items:center;gap:18px;
  padding-top:clamp(10px,2vh,20px);border-top:1px solid var(--line-soft);
}
.foot-meta{margin:0;font-size:10px;letter-spacing:.14em;color:var(--ink-3)}
.transport{
  display:flex;align-items:center;gap:14px;justify-self:center;
  padding:8px 14px;border-radius:999px;
  border:1px solid rgba(255,255,255,.75);background:rgba(255,255,252,.52);
  backdrop-filter:blur(16px);-webkit-backdrop-filter:blur(16px);
  box-shadow:0 6px 24px rgba(50,40,22,.07);
}
.icon{
  width:34px;height:34px;flex:none;display:grid;place-items:center;border-radius:50%;
  border:1px solid var(--line);background:rgba(255,255,255,.5);font-size:13px;color:var(--ink-2);
  transition:background .2s var(--ease),color .2s var(--ease),border-color .2s var(--ease);
}
.icon:hover:not(:disabled){background:#fff;color:var(--ink);border-color:rgba(64,52,32,.3)}
.icon:disabled{opacity:.35;cursor:default}
#frameCounter{
  font-family:var(--mono);font-size:11px;letter-spacing:.08em;color:var(--ink-2);
  min-width:64px;text-align:center;font-variant-numeric:tabular-nums;
}
#scrubber{
  -webkit-appearance:none;appearance:none;width:clamp(80px,12vw,168px);height:3px;border-radius:2px;
  background:linear-gradient(90deg,var(--gold-deep) var(--p,0%),rgba(64,52,32,.18) var(--p,0%));
  cursor:pointer;
}
#scrubber::-webkit-slider-thumb{
  -webkit-appearance:none;width:12px;height:12px;border-radius:50%;
  background:var(--paper-hi);border:1.5px solid var(--gold-deep);
  box-shadow:0 1px 4px rgba(60,45,20,.35);transition:transform .2s var(--ease);
}
#scrubber:hover::-webkit-slider-thumb{transform:scale(1.18)}
#scrubber::-moz-range-thumb{
  width:11px;height:11px;border-radius:50%;background:var(--paper-hi);
  border:1.5px solid var(--gold-deep);
}
.solid{
  border:0;border-radius:999px;padding:13px 22px;font-size:12px;letter-spacing:.06em;
  background:var(--olive);color:#f7f4e6;justify-self:end;
  box-shadow:0 8px 22px rgba(35,44,28,.2);
  transition:transform .22s var(--ease),box-shadow .22s var(--ease),background .22s var(--ease);
}
.solid:hover:not(:disabled){transform:translateY(-1px);box-shadow:0 12px 28px rgba(35,44,28,.26);background:#455038}
.solid:active:not(:disabled){transform:translateY(0)}
.solid:disabled{opacity:.45;cursor:wait;box-shadow:none}

/* 管理面板 */
.manage{
  position:absolute;left:clamp(18px,4vw,58px);right:clamp(18px,4vw,58px);bottom:calc(clamp(16px,2.6vh,28px) + 74px);
  z-index:6;max-height:44vh;overflow:auto;padding:14px 18px;border-radius:12px;
  border:1px solid rgba(255,255,255,.8);background:rgba(252,250,244,.94);
  backdrop-filter:blur(20px);-webkit-backdrop-filter:blur(20px);
  box-shadow:0 18px 50px rgba(40,30,15,.16);
  font-size:11px;color:var(--ink-2);
}
.manage summary{cursor:pointer;font-size:11px;letter-spacing:.1em;color:var(--ink-2);list-style:none}
.manage summary::-webkit-details-marker{display:none}
.manage summary::before{content:'＋ ';color:var(--gold-deep)}
.manage[open] summary::before{content:'− '}
.manage label{display:block;margin:14px 0;font-size:10px;letter-spacing:.14em;color:var(--ink-3)}
.manage select{
  display:block;width:100%;margin-top:8px;padding:9px 10px;font-size:12px;
  border:1px solid var(--line);border-radius:6px;background:#fffdf8;color:var(--ink-2);
}
#photoManager{display:flex;flex-wrap:wrap;gap:6px;max-height:112px;overflow:auto;margin-top:8px}
.manage-item{
  display:flex;align-items:center;gap:8px;padding:5px 8px;border-radius:5px;
  background:rgba(64,52,32,.05);font-size:10px;color:var(--ink-2);
}
.manage-item span{max-width:140px;white-space:nowrap;overflow:hidden;text-overflow:ellipsis}
.manage-item button{font-size:9.5px;color:var(--gold-deep);text-decoration:underline;text-underline-offset:2px}
#status:empty{display:none}
#status{
  position:absolute;left:50%;bottom:calc(clamp(16px,2.6vh,28px) + 82px);translate:-50% 0;
  margin:0;max-width:min(560px,80vw);padding:9px 14px;border-radius:8px;
  font-size:10.5px;line-height:1.7;letter-spacing:.04em;color:#7a5c2c;
  background:rgba(255,252,240,.85);box-shadow:0 4px 18px rgba(50,40,20,.08);
  text-align:center;pointer-events:none;
}

/* ---------- 8 dialogs ---------- */
dialog{color:var(--ink)}
#photoDialog{
  padding:52px 18px 20px;border:0;border-radius:14px;background:#1d2018;color:#f2efe2;
  max-width:96vw;shadow:none;box-shadow:0 40px 120px rgba(20,24,16,.5);text-align:center;
}
#photoDialog::backdrop{background:rgba(28,32,24,.55);backdrop-filter:blur(10px)}
#photoDialog .icon{
  position:absolute;right:12px;top:12px;color:#f2efe2;border-color:rgba(255,255,255,.3);
  background:rgba(255,255,255,.08);
}
#largePhoto{display:block;max-width:100%;max-height:72dvh;object-fit:contain;border-radius:2px}
#largeCaption{
  margin:14px 0 0;font-size:10.5px;letter-spacing:.14em;color:rgba(242,239,226,.72);
  font-family:var(--mono);
}
#addRollDialog{
  width:min(430px,92vw);padding:26px 26px 22px;border:1px solid rgba(255,255,255,.8);
  border-radius:16px;background:rgba(250,248,242,.95);
  backdrop-filter:blur(26px);-webkit-backdrop-filter:blur(26px);
  box-shadow:0 30px 90px rgba(35,28,15,.24);
}
#addRollDialog::backdrop{background:rgba(240,237,228,.35);backdrop-filter:blur(3px)}
.add-head{display:flex;align-items:flex-start;justify-content:space-between;gap:12px}
.add-head .eyebrow{font-size:8.5px;letter-spacing:.3em}
.add-head h2{
  font-family:var(--serif);font-weight:400;font-size:21px;letter-spacing:.1em;margin:10px 0 22px;
}
#addRollForm>label{display:block;font-size:10px;letter-spacing:.16em;color:var(--ink-3);margin-bottom:9px}
#stockSelect{
  width:100%;padding:12px 12px;border:1px solid var(--line);border-radius:8px;
  background:#fffdf8;font-size:12.5px;color:var(--ink-2);
}
#stockPreview{
  height:236px;display:flex;align-items:center;justify-content:center;
  margin:14px 0 10px;border-radius:10px;
  background:radial-gradient(60% 60% at 50% 45%,rgba(255,255,255,.9),rgba(64,52,32,.04));
}
#stockPreview .cartridge{height:196px;width:auto}
#addRollForm>p{font-size:10.5px;line-height:1.9;color:var(--ink-3);margin:0 0 6px;letter-spacing:.04em}
#addRollForm>.solid{width:100%;margin-top:10px;padding:14px}
#addStatus{margin:10px 0 0;font-size:10.5px;color:#8a5a32;line-height:1.7}

/* ---------- 9 feedback ---------- */
#toast{
  position:fixed;left:50%;bottom:26px;translate:-50% 0;z-index:9997;
  display:flex;align-items:center;gap:18px;padding:12px 16px 12px 18px;border-radius:999px;
  background:rgba(44,50,36,.96);color:#f6f3e6;font-size:11.5px;letter-spacing:.04em;
  box-shadow:0 14px 40px rgba(25,30,18,.3);
  backdrop-filter:blur(10px);animation:toastIn .3s var(--ease-out);
}
#toast button{color:#e8c987;text-decoration:underline;text-underline-offset:3px;white-space:nowrap;font-size:11px}
@keyframes toastIn{from{opacity:0;translate:-50% 12px}to{opacity:1;translate:-50% 0}}

/* 展开时的背景退焦 */
body.inspecting>header,body.inspecting>main{opacity:.16}
body.inspecting .room-note{opacity:0}
body>header,body>main{transition:opacity .5s var(--ease)}
#roomBackdropBlur{
  position:fixed;inset:0;width:100%;height:100%;z-index:-1;pointer-events:none;
  opacity:0;transition:opacity .52s var(--ease);
}
body.inspecting #roomBackdropBlur{opacity:1}
/* 注意：opening 状态下必须把 transition 关掉，否则占位框会「淡出」而不是立刻消失，
   飞行的头 200ms 就会看到它 —— 这正是之前「胶卷没到位底图先出现」的原因。 */
/* HUD 不走 CSS animation：animation 一旦被挂上就会自己跑完，
   和「等胶卷落地再揭幕」的节奏对不上。改成由 opening 类的移除驱动 transition。 */
.viewer-head,.viewer-foot{opacity:1;translate:0 0;transition:opacity .5s var(--ease),translate .5s var(--ease)}
#rollDialog.opening .viewer-head,#rollDialog.opening .viewer-foot{opacity:0;translate:0 10px;transition:none}

/* ---------- 10 responsive ---------- */
@media(max-width:900px){
  :root{--frame-w:282px;--frame-h:190px}
  .viewer-foot{grid-template-columns:auto 1fr auto;gap:12px}
  #scrubber{width:clamp(60px,12vw,120px)}
}
@media(max-width:760px){
  :root{--frame-w:206px;--frame-h:140px}
  header{height:60px;padding:0 16px}
  .brand{gap:10px;font-size:20px}
  .brand svg{width:21px;height:21px}
  .brand span{font-size:13.5px;letter-spacing:.14em}
  .brand small{font-size:6.5px;letter-spacing:.22em;margin-top:6px}
  .home-actions{gap:2px}
  .outline{padding:9px 14px;font-size:11px}
  .text-button{padding:8px 8px;font-size:11px}
  .intro{padding:10px 16px 0}
  .intro h1{font-size:22px;letter-spacing:.08em;margin:12px 0 9px;text-indent:.08em}
  .intro>p:last-child{font-size:10px;letter-spacing:.12em}
  .eyebrow{font-size:8.5px;letter-spacing:.3em}
  .collection-tools{height:28px;font-size:9px;letter-spacing:.1em}
  .collection-tools .text-button{font-size:9px}
  .room-wrap{padding:0 0 2px}
  .room-note{font-size:7.5px;letter-spacing:.14em;padding:9px 12px 0}
  .room-note span:last-child{letter-spacing:.08em;text-align:right;max-width:46%}
  .roll-button::after{display:none}
  .delete-roll{width:20px;height:20px;font-size:13px;top:-5px;right:-5px}

  #rollDialog:open{padding:14px 14px 12px}
  .viewer-head{gap:10px}
  #rollTitle{font-size:16px;letter-spacing:.08em}
  .gesture-note{display:none}
  .return-button{padding:10px 14px;min-height:40px;font-size:11px;gap:8px}
  .return-button kbd{display:none}
  .unroll-stage{--cart-w:104px}
  .film-window{left:calc(var(--cart-w) - 1px)}
  .film-exit{left:calc(var(--cart-w) - 9px);width:13px}
  .empty-hint{left:calc(var(--cart-w) + 11px);font-size:13px;line-height:1.8;letter-spacing:.08em}
  .empty-hint span{font-size:8px}
  .film-frame{padding:18px 8px}
  .edge-text{font-size:6px;left:9px;right:9px}
  .viewer-foot{grid-template-columns:1fr;justify-items:stretch;gap:10px;padding-top:10px}
  .foot-meta{display:none}
  .transport{justify-self:stretch;justify-content:center;padding:7px 10px;gap:8px}
  .transport #scrubber{display:none}
  .solid{justify-self:stretch;text-align:center;padding:13px}
  .manage,.viewer-foot{position:relative}
  .manage{left:0;right:0;bottom:0;max-height:38vh}
  #status{position:static;translate:none;max-width:none;padding:8px 10px;font-size:9.5px}
  #photoDialog{padding:48px 10px 16px;border-radius:10px}
  #addRollDialog{padding:22px 18px 18px;border-radius:14px}
  #stockPreview{height:206px}
  #stockPreview .cartridge{height:168px;width:auto}
  .add-head h2{font-size:19px}
}
@media(max-width:380px){
  :root{--frame-w:180px;--frame-h:124px}
  header{padding:0 12px}
  .brand{gap:8px}
  .brand svg{width:19px;height:19px}
  .brand span{font-size:12px;letter-spacing:.09em}
  .brand small{font-size:6px;letter-spacing:.13em;margin-top:5px}
  .home-actions{gap:1px}
  .text-button{font-size:10px;padding:8px 5px}
  .outline{font-size:10px;padding:8px 10px}
  .intro h1{font-size:20px}
}
@media(prefers-reduced-motion:reduce){
  *{animation:none!important;transition:none!important}
}
/* Preserve a continuous room, complete model geometry, and 300ms motion. */
html{background:#fff}footer{background:none}.cartridge.realistic{overflow:visible;aspect-ratio:auto;width:100%;height:100%}.cartridge.realistic img,.cartridge.realistic canvas{position:static;display:block;width:100%;height:100%;max-width:100%;left:auto;top:auto;object-fit:contain}.roll-slot .roll-button{position:absolute;top:-21.69%;left:50%;translate:-50% 0;height:138.55%;width:auto;aspect-ratio:360/460}.roll-button .cartridge{width:100%;height:100%}.roll-button.selected{opacity:0;transition:none}.unroll-stage{--cart-w:clamp(215px,24vw,300px)}.floating{width:var(--cart-w);height:calc(var(--cart-w)*460/360)}.floating .cartridge{width:100%;height:100%}.film-window{left:calc(var(--cart-w)*.72);height:var(--frame-h)}.film-exit{left:calc(var(--cart-w)*.72 - 13px);height:calc(var(--frame-h) - 30px)}.empty-hint{left:calc(var(--cart-w)*.98 + 20px)}.float-shadow{top:calc(50% + var(--cart-w)*.53);left:4%;width:60%}#stockPreview .cartridge{aspect-ratio:360/460;width:155px;height:200px}#roomBackdropBlur,body>header,body>main{transition-duration:.3s}.viewer-head,.viewer-foot{transition-duration:.18s}#rollDialog[open]::backdrop{animation-duration:.3s}#rollDialog::backdrop{background-color:rgba(243,240,232,.25)}
/* A landing gate, not an opacity timer. No stale exit or negative strip may paint early. */
#rollDialog[data-phase="opening"] .film-exit,#rollDialog[data-phase="opening"] .film-window,#rollDialog[data-phase="opening"] .empty-hint,#rollDialog[data-phase="opening"] .viewer-foot{visibility:hidden!important;opacity:0!important;transition:none!important;pointer-events:none!important}#rollDialog:not(.has-film) .film-exit{visibility:hidden;opacity:0;transition:none}#rollDialog.opening .viewer-head{opacity:1;translate:0 0;transition:none}#rollDialog[data-phase="opening"] .float-shadow{opacity:0}#rollDialog[data-phase="ready"] .film-window{transition:none}.film-exit{transition:none}@media(max-width:760px){.unroll-stage{--cart-w:200px}.film-window{left:calc(var(--cart-w)*.72)}.film-exit{left:calc(var(--cart-w)*.72 - 12px)}.empty-hint{left:calc(var(--cart-w)*.98 + 10px)}#stockPreview .cartridge{width:145px;height:185px}.viewer-foot{grid-template-columns:auto 1fr auto;gap:8px}.viewer-foot .solid{padding:11px 14px;justify-self:end}.viewer-foot .transport{justify-self:start}.viewer-foot .foot-meta{display:none}.viewer-foot .transport #scrubber{display:none}.viewer-head{gap:8px}.viewer-head #rollTitle{max-width:56vw;line-height:1.4}.gesture-note{display:none}}@media(max-width:420px){:root{--frame-w:190px;--frame-h:132px}.unroll-stage{--cart-w:178px}.empty-hint{font-size:11px}.empty-hint span{font-size:8px}.return-button{padding:10px 12px}}@media(max-height:600px){.unroll-stage{--cart-w:185px}.viewer-head .eyebrow,.gesture-note{display:none}}
main{width:100%;min-width:0}.room-wrap{min-width:0;width:100%}.intro,.collection-tools{min-width:0;max-width:100%}.room{max-width:100%}.room-note{min-width:0}.viewer-head,.viewer-foot{min-width:0}.viewer-title{min-width:0}#rollDialog .manage[hidden]{display:none!important}

/* Continuous ribbon aligned with a stationary tangent-facing outlet. */
:root{--frame-w:clamp(190px,21vw,270px);--frame-h:clamp(126.67px,14vw,180px)}
.film-window{left:calc(var(--cart-w)*.765);top:calc(50% + var(--cart-w)*.045);z-index:2;mask-image:none;-webkit-mask-image:none}
.film-exit{display:none!important}
.film-frame{padding:19px 9px;box-shadow:inset 0 0 12px rgba(0,0,0,.22);background:#33231d}
.film-track{align-items:stretch}
.strip-leader{position:relative;flex:0 0 calc(var(--frame-w)*.32);height:100%;background:linear-gradient(110deg,#33231d,#4b3028 70%,#3c2722);clip-path:polygon(0 0,95% 0,100% 4%,100% 65%,82% 69%,70% 79%,64% 97%,60% 100%,0 100%)}
.strip-leader::before,.strip-leader::after{content:'';position:absolute;left:0;right:0;height:11px;background-image:url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='26' height='11'%3E%3Crect x='4' y='1.5' width='10' height='8' rx='2.2' fill='%23ece7d6'/%3E%3C/svg%3E");background-repeat:repeat-x;opacity:.94}
.strip-leader::before{top:5px}.strip-leader::after{bottom:5px}
.empty-hint{border:0;background:none;font-size:14px;letter-spacing:.08em}
@media(max-width:760px){:root{--frame-w:180px;--frame-h:120px}.film-window{left:calc(var(--cart-w)*.765)}}
@media(max-width:420px){:root{--frame-w:159px;--frame-h:106px}}
@media(max-height:600px){:root{--frame-w:165px;--frame-h:110px}}