:root{color-scheme:dark;font-family:-apple-system,BlinkMacSystemFont,"PingFang SC",sans-serif;background:#17150f;color:#e8dfce}*{box-sizing:border-box}body{margin:0}header{height:48px;display:flex;align-items:center;justify-content:space-between;padding:0 24px;border-bottom:1px solid #38342b}header h1{font-size:15px;font-weight:500;margin:0;letter-spacing:.12em}header span{font-size:11px;color:#b8ac95}main{width:100%;margin:0 auto}#stage{position:relative;width:min(100%,calc((100vh - 110px)*16/9));aspect-ratio:16/9;margin:0 auto;background:#17150f;overflow:hidden}#scene{display:block;width:100%;height:100%;cursor:grab;touch-action:none}#scene:active{cursor:grabbing}#scene:focus-visible{outline:1px solid #d5b67b;outline-offset:-2px}body:not(.ready) #scene{visibility:hidden}#loading{position:absolute;inset:0;display:grid;place-items:center;background:#17150f;color:#d3c5ab;font-size:14px;letter-spacing:.05em}body:not(.ready) #loading{display:grid!important}.ready #loading[hidden]{display:none}.overlay{position:absolute;left:18px;top:14px;pointer-events:none}.overlay b{font-size:10px;font-weight:500;letter-spacing:.1em;color:#f0e4cd;text-shadow:0 1px 4px #000}.bottom{min-height:60px;display:flex;align-items:center;justify-content:space-between;gap:16px;padding:12px 24px;border-top:1px solid #38342b}.bottom p{margin:0;font-size:12px;color:#c6baa4}.actions{display:flex;align-items:center;gap:12px;white-space:nowrap}button,a{font:inherit;font-size:12px;color:#dfceb1}button{border:1px solid #64563e;border-radius:3px;background:transparent;padding:7px 10px;cursor:pointer}button:hover{background:#3c3528}a{text-decoration:none}a:hover{text-decoration:underline}#position{display:block;font-size:10px;color:#8e836e;margin-top:5px}#metrics{display:none}#captures{padding:24px;max-width:1600px;margin:auto}#captures img{display:block;width:100%;height:auto}#captures a{display:block;margin:8px 0}#diagnostics{display:none!important}[hidden]{display:none}@media(max-width:700px){header{height:40px;padding:0 12px}#stage{width:100%;margin:14vh 0 0}.bottom{flex-direction:column;align-items:flex-start;padding:12px}.actions{gap:16px}header span{font-size:10px}.overlay{left:10px;top:8px}}

.overlay{pointer-events:auto}.day-night{display:flex;align-items:center;gap:6px;padding:4px 7px;background:rgba(20,17,12,.34);border:1px solid rgba(230,218,191,.24);border-radius:4px;backdrop-filter:blur(7px)}.day-night button{border:0;padding:5px 7px;font-size:10px;letter-spacing:.14em;color:#c0b8a6}.day-night button[aria-pressed=true]{color:#fff0d5;background:rgba(230,206,156,.15)}.day-night button:disabled{opacity:.45;cursor:wait}.day-night span{font-size:10px;color:#9a8c76}.day-night button:focus-visible{outline:1px solid #e6c995;outline-offset:2px}
.day-night button{touch-action:manipulation}.day-night button:active{background:rgba(230,206,156,.25)}
/* Keep the status readable when the inspection tools wrap. */
.bottom{flex-wrap:wrap}.bottom>div{flex:1 1 250px;min-width:220px}.actions{flex-wrap:wrap;justify-content:flex-end;gap:8px}.actions select{max-width:160px}
#vhs-fullscreen{position:fixed;inset:0;z-index:1000;background:#000;display:flex;align-items:center;justify-content:center}#vhs-fullscreen[hidden]{display:none}#vhs-fullscreen video{display:block;width:100%;height:100%;object-fit:contain}#vhs-fullscreen video[hidden]{display:none}#vhs-shrink{position:absolute;right:max(24px,env(safe-area-inset-right));bottom:max(24px,env(safe-area-inset-bottom));padding:12px 18px;background:rgba(18,17,14,.85);border:1px solid #bca98a;border-radius:5px;font-size:15px;color:#fff}.vhs-fullscreen-open{overflow:hidden}

/* A quiet, frameless exit glyph; retain a keyboard-only focus indicator. */
#vhs-shrink{display:grid;place-items:center;width:48px;height:48px;padding:12px;border:0;border-radius:0;background:none;color:rgba(255,255,255,.85);filter:drop-shadow(0 1px 3px #000);outline:none}#vhs-shrink:hover{background:none;color:white}#vhs-shrink:focus-visible{outline:1px solid rgba(255,255,255,.5);outline-offset:2px}

/* Fullscreen transport shares the same video element and timeline as the CRT. */
#vhs-transport{position:absolute;left:0;right:0;bottom:0;display:flex;align-items:center;gap:16px;padding:32px max(24px,env(safe-area-inset-right)) max(18px,env(safe-area-inset-bottom));background:linear-gradient(transparent,rgba(0,0,0,.72));color:#f3f0e9}
#vhs-transport button{flex:0 0 40px;height:40px;display:grid;place-items:center;padding:8px;border:0;background:none;color:inherit;cursor:pointer;touch-action:manipulation}
#vhs-transport button:hover{color:white;background:none}#vhs-transport button:focus-visible{outline:1px solid #d7c8aa;outline-offset:2px}#vhs-transport svg{width:24px;height:24px}
#vhs-transport #vhs-shrink{position:static;filter:none;width:40px;height:40px;padding:8px}
.vhs-time{font-size:12px;font-variant-numeric:tabular-nums;white-space:nowrap;min-width:36px;text-align:center}
#vhs-timeline{--progress:0%;flex:1;min-width:60px;appearance:none;-webkit-appearance:none;height:28px;margin:0;cursor:pointer;background:transparent;touch-action:none}
#vhs-timeline::-webkit-slider-runnable-track{height:3px;border-radius:2px;background:linear-gradient(to right,#e9ddc4 var(--progress),#ffffff55 var(--progress))}
#vhs-timeline::-webkit-slider-thumb{appearance:none;-webkit-appearance:none;width:11px;height:11px;margin-top:-4px;border-radius:50%;background:#f8f3e9;border:0}
#vhs-timeline::-moz-range-track{height:3px;background:#ffffff55}#vhs-timeline::-moz-range-progress{height:3px;background:#e9ddc4}#vhs-timeline::-moz-range-thumb{width:11px;height:11px;border-radius:50%;background:#f8f3e9;border:0}#vhs-timeline:focus-visible{outline:1px solid #d7c8aa;outline-offset:3px}
@media(max-width:600px){#vhs-transport{gap:8px;padding-left:12px;padding-right:12px}.vhs-time{font-size:11px}}

#vhs-fullscreen:focus{outline:none}

/* Quiet labels sit just above/right of the pointer; never intercept scene input. */
#vhs-hover-tip{position:fixed;z-index:900;pointer-events:none;user-select:none;white-space:nowrap;padding:4px 7px;border:1px solid rgba(240,226,201,.16);border-radius:4px;background:rgba(29,26,22,.89);color:#eee5d6;font:400 10px/1.4 -apple-system,BlinkMacSystemFont,"PingFang SC",sans-serif;letter-spacing:.04em;box-shadow:0 2px 8px rgba(0,0,0,.16)}
#vhs-hover-tip[hidden]{display:none}

/* Writing is grounded in the existing 3D sheet; this is only its quiet tool strip. */
#write-letter-entry{position:absolute;right:18px;top:14px;padding:9px 13px;background:rgba(20,17,12,.42);border:1px solid rgba(230,218,191,.24);color:#f0e4cd;font-size:11px;letter-spacing:.1em;backdrop-filter:blur(7px)}
#letter-input{position:fixed;width:2px;height:24px;padding:0;border:0;opacity:.01;color:transparent;caret-color:transparent;background:transparent;resize:none;overflow:hidden;pointer-events:none;z-index:20;font-size:16px}
#letter-tools{display:flex;align-items:center;justify-content:space-between;gap:16px;width:100%;padding:8px 0 0;border-top:1px solid #38342b}#letter-tools[hidden]{display:none}#letter-state{font-size:11px;color:#b9a98d}.letter-tool-actions{display:flex;align-items:center;gap:8px}.letter-tool-actions button{font-size:11px}.letter-tool-actions button:disabled{opacity:.3;cursor:default}#letter-page-count{font-size:10px;color:#b9a98d;min-width:36px;text-align:center}.writing-letter .bottom>.actions{display:none}.writing-letter #position{display:none}.writing-letter #scene{cursor:text}.writing-letter #write-letter-entry{opacity:.5}
#letter-preview-dialog{width:min(960px,94vw);max-height:94vh;padding:0;border:1px solid #5f5545;border-radius:5px;background:#211e18;color:#e8dfce;box-shadow:0 20px 90px #0008}#letter-preview-dialog::backdrop{background:#0c0b09b3;backdrop-filter:blur(4px)}#letter-preview-dialog header{height:auto;padding:18px 22px;position:sticky;top:0;background:#211e18;gap:24px;z-index:1}#letter-preview-dialog strong{font-size:14px;font-weight:500}#letter-preview-dialog p{font-size:11px;color:#b9a98d;margin:6px 0 0}#letter-preview-dialog footer{position:sticky;bottom:0;background:#211e18;padding:14px 22px;display:flex;align-items:center;gap:12px;border-top:1px solid #38342b}#letter-submit-state{flex:1;font-size:11px;color:#b9a98d}#letter-submit:disabled{opacity:.45;cursor:not-allowed}#letter-preview-pages{display:grid;gap:24px;padding:28px;background:#13120f;max-height:68vh;overflow:auto}#letter-preview-pages img{width:min(100%,600px);height:auto;margin:auto;display:block;box-shadow:0 8px 30px #0004}
@media(max-width:700px){#letter-tools{align-items:flex-start;flex-direction:column}.letter-tool-actions{gap:5px;flex-wrap:wrap}#write-letter-entry{right:10px;top:8px}#letter-preview-dialog footer{flex-wrap:wrap}#letter-submit-state{flex-basis:100%}}

/* v21: compact writing preferences, using the same mechanical sound switch. */
#letter-font{font:inherit;font-size:11px;color:#e2d5bc;background:#24211c;border:1px solid #5b5141;border-radius:4px;padding:5px 7px;max-width:120px;cursor:pointer}
#letter-font:focus-visible{outline:1px solid #d7bb82;outline-offset:2px}
#letter-tools .letter-tool-actions{flex-wrap:wrap;justify-content:flex-end}
@media(max-width:760px){#letter-tools{flex-wrap:wrap;gap:8px}#letter-tools .letter-tool-actions{justify-content:flex-start}}

.writing-letter .bottom>div:first-child{display:none}
.writing-letter #letter-tools{flex:1 1 100%;border-top:0;padding-top:0}

/* v22: a full-viewport room with a light, shared HUD. */
html,body{width:100%;height:100%;overflow:hidden}
body>header,.bottom{display:none!important}
main{position:fixed;inset:0;width:100%;height:100%}
#stage{position:fixed;inset:0;width:100vw;height:100vh;height:100dvh;aspect-ratio:auto;margin:0;overflow:hidden}
#scene{width:100%;height:100%}
.overlay{left:max(26px,env(safe-area-inset-left));top:max(22px,env(safe-area-inset-top));z-index:25}
.day-night{border:0;background:none;padding:0;gap:8px;backdrop-filter:none}
.day-night button{color:#fff;opacity:.52;padding:8px 3px;background:none!important;font-size:11px;letter-spacing:.12em;text-shadow:0 1px 5px #000b}
.day-night button[aria-pressed=true]{color:#fff;opacity:1}
.day-night span{color:#fff;opacity:.4;text-shadow:0 1px 4px #000}
#reset{display:flex;align-items:center;gap:7px;margin-top:7px;border:0;padding:5px 3px;color:#fff;font-size:10px;letter-spacing:.06em;opacity:.8;background:none;text-shadow:0 1px 4px #000b}
#reset svg{width:14px;height:14px;filter:drop-shadow(0 1px 2px #0008)}
#reset:hover{opacity:1}
#room-shortcuts{position:absolute;top:max(16px,env(safe-area-inset-top));right:max(24px,env(safe-area-inset-right));z-index:25;display:flex;align-items:center;gap:16px}
#room-shortcuts .room-shortcut{position:static;display:grid;place-items:center;flex:0 0 44px;width:44px;height:44px;padding:10px;border:0;border-radius:0;background:none;backdrop-filter:none;color:white;opacity:.88;cursor:pointer;transition:opacity 130ms ease-out;touch-action:manipulation}
#room-shortcuts .room-shortcut svg{width:24px;height:24px;filter:drop-shadow(0 1px 3px #000a)}
#room-shortcuts .room-shortcut:hover,#room-shortcuts .room-shortcut[aria-current=page]{opacity:1}
#room-shortcuts .room-shortcut[aria-disabled=true]{cursor:default;opacity:.6}
#room-shortcuts .room-shortcut:focus-visible,#reset:focus-visible,#interaction-exit:focus-visible{outline:1px solid #fff9;outline-offset:1px;border-radius:3px}
#shortcut-label{position:absolute;top:52px;transform:translate(-50%,-3px);opacity:0;pointer-events:none;white-space:nowrap;color:#fff;font:400 11px/1.4 "PingFang SC",sans-serif;letter-spacing:.1em;padding:7px 10px;background:#17151066;border:1px solid #ffffff20;border-radius:5px;text-shadow:0 1px 4px #0008;transition:opacity 120ms ease-out,transform 120ms ease-out}
#shortcut-label.visible{opacity:1;transform:translate(-50%,0)}
#letter-tools,.writing-letter #letter-tools{position:absolute;right:max(28px,env(safe-area-inset-right));bottom:max(24px,env(safe-area-inset-bottom));z-index:24;width:auto;max-width:calc(100vw - 40px);display:flex;flex-direction:column;align-items:flex-end;gap:10px;border:0;padding:0;background:none;text-shadow:0 1px 4px #000b}
#letter-tools[hidden]{display:none!important}
#letter-tools .letter-preferences{order:1;display:flex;align-items:center;gap:9px;color:#fff9;font-size:10px}
#letter-tools .letter-tool-actions{order:2;display:flex;flex-wrap:nowrap;gap:18px}
#letter-tools #letter-state{order:3;color:#ffffffa6;font-size:10px;max-width:310px;text-align:right}
#letter-tools button,#hud-sound-home button{border:0;background:none;color:#fff;padding:6px 0;border-radius:0;font-size:11px;letter-spacing:.04em;text-shadow:0 1px 4px #000c;white-space:nowrap}
#letter-tools button:hover,#hud-sound-home button:hover{text-decoration:underline;text-underline-offset:5px}
#letter-tools button:focus-visible,#hud-sound-home button:focus-visible{outline:1px solid #ffffff99;outline-offset:4px}
#letter-tools #letter-font{display:none}
#letter-tools .letter-preferences button{font-size:10px;color:#fff9}
#letter-tools #letter-page-count{min-width:28px;color:#ffffffa6}
#letter-tools #letter-page-prev,#letter-tools #letter-page-next{width:16px}
#hud-sound-home{position:absolute;left:max(29px,env(safe-area-inset-left));bottom:max(24px,env(safe-area-inset-bottom));z-index:24}
#hud-sound-home button{font-size:10px;opacity:.65}
#interaction-exit{position:absolute;right:max(28px,env(safe-area-inset-right));bottom:max(24px,env(safe-area-inset-bottom));z-index:24;display:flex;align-items:center;gap:7px;border:0;background:none;color:#fff;font-size:11px;text-shadow:0 1px 4px #000b}
#interaction-exit[hidden]{display:none}
#interaction-exit svg{width:15px;height:15px;filter:drop-shadow(0 1px 2px #0008)}
@media(max-width:600px){.overlay{left:14px;top:12px}#room-shortcuts{right:10px;top:8px;gap:4px}#room-shortcuts .room-shortcut{width:36px;height:40px;flex-basis:36px;padding:8px}#room-shortcuts .room-shortcut svg{width:21px;height:21px}#shortcut-label{top:46px}#letter-tools,.writing-letter #letter-tools{right:18px;bottom:max(18px,env(safe-area-inset-bottom))}#letter-tools .letter-tool-actions{gap:22px}#hud-sound-home{left:16px;bottom:18px}}
@media(prefers-reduced-motion:reduce){#shortcut-label,#room-shortcuts .room-shortcut{transition:none}}
/* v23: writing tools sit beside the physical typewriter, not in the page footer. */
.day-night{border:1px solid #ffffff40;border-radius:5px;background:#19171066;backdrop-filter:blur(8px);padding:5px 8px;gap:8px}
.day-night button{font-size:13px;padding:7px 9px;letter-spacing:.12em}
.day-night button[aria-pressed=true]{background:#ffffff16!important;border-radius:3px}
#reset{position:relative;width:34px;height:34px;display:grid;place-items:center;margin-top:10px;padding:7px;background:#19171044;border:1px solid #ffffff30;border-radius:4px}
#reset svg{width:18px;height:18px}
#reset .reset-hint{position:absolute;left:44px;top:50%;transform:translateY(-50%);white-space:nowrap;padding:6px 9px;border-radius:4px;background:#19171099;font-size:10px;opacity:0;pointer-events:none;transition:opacity 140ms ease}
#reset:hover .reset-hint,#reset:focus-visible .reset-hint{opacity:1}
#letter-tools,.writing-letter #letter-tools{right:clamp(32px,15vw,260px);top:49%;bottom:auto;transform:translateY(-30%);width:44px;gap:13px;align-items:center}
#letter-tools .letter-icon{width:42px;height:42px;display:grid;place-items:center;padding:9px;border:1px solid #ffffff2c;border-radius:5px;background:#201b1530;backdrop-filter:blur(5px);color:#fff}
#letter-tools .letter-icon svg{width:22px;height:22px;filter:drop-shadow(0 1px 3px #0007)}
#letter-tools .letter-icon:hover,#letter-tools .letter-icon[aria-expanded=true]{background:#201b156b;text-decoration:none;border-color:#ffffff66}
.letter-sr-only{position:absolute!important;width:1px!important;height:1px!important;padding:0!important;overflow:hidden!important;clip:rect(0,0,0,0)!important;white-space:nowrap}
#letter-tool-tip{position:absolute;left:54px;transform:translateY(-50%);opacity:0;pointer-events:none;white-space:nowrap;padding:5px 8px;color:white;background:#201b1580;border-radius:4px;font-size:10px;letter-spacing:.06em;transition:opacity 120ms ease}
#letter-tool-tip.visible{opacity:1}
.letter-note{position:absolute;z-index:30;right:calc(clamp(32px,15vw,260px) + 62px);top:43%;transform:translateY(-35%);width:320px;max-width:calc(100vw - 110px);padding:28px 27px 23px;background:#f0e6cf;color:#4b4032;border:1px solid #d9cbb0;box-shadow:0 9px 28px #0003;font:14px/1.9 "Songti SC",serif}
.letter-note[hidden]{display:none}
.letter-note h2{font-size:19px;font-weight:500;letter-spacing:.12em;margin:0 0 20px}
.letter-note ul{padding:0;margin:0;list-style:none}.letter-note li{margin:12px 0}.letter-note p{font-size:12px;line-height:1.9;margin:24px 0 0;color:#756552}
.letter-note .note-close{position:absolute;right:10px;top:8px;border:0;background:none;color:#776851;font:20px/1 system-ui;padding:5px}
#letter-sound-panel{width:295px;font-family:"PingFang SC",sans-serif}
#letter-sound-host button{border:1px solid #c7b99e;color:#5e503c;font-size:11px;margin-bottom:15px}
#letter-sound-panel fieldset{border:0;padding:0;margin:0}#letter-sound-panel legend{font-size:11px;color:#86745d;margin-bottom:8px}
.sound-choice{display:flex;align-items:center;justify-content:space-between;gap:12px;padding:11px 0;border-bottom:1px solid #d8cbb2}
.sound-choice label{display:flex;align-items:center;gap:9px;font-size:13px;cursor:pointer}.sound-choice input{accent-color:#6b573a}.sound-choice small{display:block;font-size:10px;color:#8e7c64}
.sound-choice button{font-size:11px;color:#746047;padding:5px 8px;border:1px solid #cabb9f}.sound-choice button:hover{background:#dfd1b5}
#letter-preview-pages{display:block;padding:24px;max-height:54vh;overflow:auto;background:#18150f}
#letter-preview-editor{display:block;box-sizing:border-box;width:min(100%,600px);min-height:600px;margin:0 auto;padding:60px;background:#f4edde;color:#201a13;border:0;border-radius:0;resize:none;font:400 22px/33px "Songti SC","STSong","Noto Serif CJK SC",serif;white-space:pre-wrap;outline:none;box-shadow:0 4px 20px #0003}
#letter-preview-editor:focus-visible{outline:1px solid #c5a56d;outline-offset:3px}
.letter-reply{padding:14px 24px 5px;display:grid;gap:7px;background:#211e18}.letter-reply label{font-size:11px;color:#d2c3a9}.letter-reply label span{font-size:10px;color:#9d8e75;margin-left:5px}
#letter-email{width:100%;border:0;border-bottom:1px solid #71624b;background:transparent;color:#f0e4ce;padding:8px 0;font:12px/1.5 "PingFang SC",sans-serif;outline:none}#letter-email:focus{border-color:#c6ae81}#letter-email::placeholder{color:#a39680;opacity:1}#letter-email-error{font-size:11px;color:#d3ad89;min-height:0}
@media(max-width:760px){#letter-tools,.writing-letter #letter-tools{right:24px;top:48%}.letter-note{right:82px;width:280px;padding:23px 20px;max-width:calc(100vw - 100px)}#letter-tool-tip{left:auto;right:54px}#letter-preview-editor{font-size:18px;line-height:29px;padding:35px 26px}#letter-preview-pages{padding:16px}.day-night{gap:3px;padding:3px 5px}.day-night button{font-size:12px;padding:7px}#letter-preview-dialog header{padding:14px}.letter-reply{padding:12px 16px 4px}}
@media(prefers-reduced-motion:reduce){#letter-tool-tip,#reset .reset-hint{transition:none}}
/* v24: translucent letter desk, with a distinct reply-address field. */
#letter-preview-dialog{background:linear-gradient(125deg,#6450398c,#211d19bf 60%);border:1px solid #d4b682a3;border-radius:22px;box-shadow:0 24px 90px #0007,inset 0 1px 0 #fff2;color:#f4ead5;backdrop-filter:blur(22px);width:min(1000px,92vw)}
#letter-preview-dialog::backdrop{background:#100e0b55;backdrop-filter:blur(7px)}
#letter-preview-dialog header{background:transparent;padding:26px 32px;border-bottom:0;align-items:center}
#letter-preview-dialog header>div{border-left:3px solid #d8b77d;padding-left:18px}
#letter-preview-dialog header strong{font:600 26px 'Songti SC',SimSun,serif;letter-spacing:2px}
#letter-preview-dialog header p{color:#d6cbb8;font-size:13px;margin:6px 0 0}
#letter-preview-pages{background:transparent;padding:0 26px 22px;max-height:48vh}
#letter-preview-editor{border-radius:9px;background:#f5efdf;box-shadow:0 0 0 10px #e4cda409,0 8px 32px #0003;color:#342d25}
#letter-preview-dialog .letter-reply{margin:0 30px;padding:18px 20px;background:#cbb99d21;border:1px solid #d3c09c60;border-radius:11px}
#letter-preview-dialog .letter-reply label{font:18px 'Songti SC',SimSun,serif;color:#f6ead3;margin-bottom:11px}
#letter-preview-dialog .letter-reply label:before{content:'✉';margin-right:9px;color:#dcbf89}
#letter-preview-dialog #letter-email{box-sizing:border-box;width:100%;background:#18171470;border:1px solid #c7b99580;border-radius:7px;padding:13px 15px;font-size:14px;color:#fff4e4}
#letter-email::placeholder{color:#c4bdaf;opacity:1}
#letter-preview-dialog footer{background:transparent;margin:17px 30px 0;padding:18px 0 24px;border-top:1px solid #bba27c50;gap:10px;flex-wrap:wrap}
#letter-preview-dialog button{border-radius:8px;background:#211b1440;border:1px solid #c9ad7b85;padding:10px 14px;color:#f5e5c8;transition:background 140ms,border-color 140ms}
#letter-preview-dialog button:hover{background:#c09c5630;border-color:#dcc18d}
#letter-preview-dialog #letter-submit:not(:disabled){background:#a9823e80}
#letter-preview-dialog button:disabled{opacity:.45}
#letter-tools>div[hidden]{display:none!important}
#letter-postage{position:absolute;inset:0;background:#211c16ef;backdrop-filter:blur(18px);border-radius:22px;z-index:4;display:flex;flex-direction:column;justify-content:center;align-items:center;padding:36px;gap:22px}
#letter-postage[hidden]{display:none}
.posted-envelope{position:relative;width:min(82%,800px,calc((90dvh - 200px) * 1.85));aspect-ratio:1.85;container-type:inline-size;flex-shrink:0;background:#eee3c9;box-shadow:0 20px 45px #0006;border-radius:4px;overflow:hidden;color:#5e4e38}
.envelope-fibres{position:absolute;inset:0;pointer-events:none;opacity:.07;background-image:url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='160' height='160'%3E%3Cfilter id='p'%3E%3CfeTurbulence type='fractalNoise' baseFrequency='.7 .24' numOctaves='3' stitchTiles='stitch'/%3E%3C/filter%3E%3Cpath fill='%235d5344' filter='url(%23p)' opacity='.5' d='M0 0h160v160H0z'/%3E%3C/svg%3E");mix-blend-mode:multiply}
.envelope-fold{position:absolute;inset:0;width:100%;height:100%;pointer-events:none}
.post-address{position:absolute;left:8%;top:52.5%;display:flex;align-items:baseline;gap:.3em;font:4.6cqw 'Songti SC',SimSun,serif;letter-spacing:.08em;border-bottom:1px solid #5e4e3860;padding-bottom:.12em}.post-to{font-family:Georgia,'Times New Roman',serif;letter-spacing:0}
.post-stamp{position:absolute;right:6.4%;top:11.2%;width:20%;aspect-ratio:1000/1234;background:none;padding:0;overflow:hidden;transform:none;filter:drop-shadow(0 1px 1px #594e4720)}.post-stamp img{width:100%;height:100%;display:block;object-fit:cover;object-position:50% 50%}
.postmark{position:absolute;right:9.5%;top:20.7%;width:32%;aspect-ratio:5/3;color:#5c3825;mix-blend-mode:multiply;container-type:inline-size;pointer-events:none;transform-origin:29.33% 50%;filter:url(#post-ink-wear)}.postmark svg{position:absolute;inset:0;width:100%;height:100%;overflow:visible}.post-arc-lettering{font-family:'Courier New',monospace;font-weight:700;font-size:18px;letter-spacing:0}.postmark time{position:absolute;left:12%;top:32%;width:34.7%;height:36%;display:flex;flex-direction:column;justify-content:center;text-align:center;font-family:Georgia,'Times New Roman',serif;font-weight:600;font-size:6.9cqw;font-variant-numeric:lining-nums;letter-spacing:1px;line-height:1.12;opacity:.94}.postmark time span{display:block}.postmark .post-day{font-size:1.1em}.postmark .post-year{font-size:1.04em;letter-spacing:1.2px}.post-actions{position:relative;display:flex;justify-content:center;align-items:center;width:100%;gap:14px}#letter-postage .post-replay{border-radius:26px;width:clamp(130px,14vw,234px);padding:10px 20px;font-size:clamp(14px,1.3vw,21px)}#letter-postage .post-close{position:absolute;left:calc(50% + clamp(65px,7vw,117px) + 14px);background:none;border-color:transparent;color:#cdbc9e;padding:9px 12px}.post-status{text-align:center;font-size:clamp(13px,1.55vw,25px);color:#eadbc1}
@media(max-width:650px){#letter-preview-dialog header{padding:18px}#letter-preview-dialog header strong{font-size:20px}#letter-preview-dialog .letter-reply{margin:0 16px;padding:12px}#letter-preview-dialog footer{margin:14px 16px 0}#letter-preview-pages{max-height:42vh}#letter-postage{padding:24px;gap:18px}.posted-envelope{width:min(100%,calc((90dvh - 190px) * 1.85))}#letter-postage .post-close{position:static}.post-actions{gap:6px}}
#letter-preview-dialog[open]{display:flex;flex-direction:column;height:90vh;max-height:90vh;overflow:hidden}
#letter-preview-dialog header,#letter-preview-dialog footer,#letter-preview-dialog .letter-reply{position:static;flex-shrink:0}
#letter-preview-dialog #letter-preview-pages{flex:1;min-height:100px;max-height:none;overflow:auto}
#letter-preview-dialog footer{padding-bottom:18px}
.post-stamp{z-index:1}.postmark{z-index:2}

/* The address uses the same printed-ink language, with gentler wear. */
.post-address{filter:url(#address-ink-wear)}