/* 마음잇다 — 저녁 편지를 펼친 서간집 · 2026-10-25 2차 다듬기 */
:root{
  color-scheme:dark;
  --night:#2a2328;--surface:#3a2e35;--cream:#fcf6eb;--paper-2:#fffaf3;
  --text:#faf3eb;--muted:#d0bec7;--ink:#3a2735;--subink:#5f555b;
  --plum:#6f4c6f;--plum-deep:#4f374c;--apricot:#e89769;--peach:#fddeb1;
  --rule:rgba(250,243,235,.19);--rule-soft:rgba(250,243,235,.1);
  --rule-ink:rgba(58,39,53,.16);--rule-ink-soft:rgba(58,39,53,.09);
  --serif:'Nanum Myeongjo',Georgia,serif;
  --sans:'Pretendard Variable',Pretendard,"Apple SD Gothic Neo","Malgun Gothic",-apple-system,BlinkMacSystemFont,sans-serif;
  --fs-xs:14px;--fs-s:15px;--fs-m:clamp(17px,1.6vw,18px);
  --fs-l:clamp(20px,2.2vw,26px);--fs-xl:clamp(29px,3.4vw,40px);--fs-display:clamp(38px,5.2vw,64px);
  --space-section:clamp(64px,9vw,120px);--space-block:clamp(28px,4vw,44px);
  --radius-s:6px;--radius-m:12px;--radius-l:20px;
  --shadow-1:0 1px 2px rgba(20,14,18,.22);--shadow-2:0 12px 32px -16px rgba(20,14,18,.55);
  --shadow-p1:0 1px 2px rgba(58,39,53,.07);--shadow-p2:0 12px 32px -16px rgba(58,39,53,.3);
  --ease:cubic-bezier(.2,.7,.2,1);--t-fast:160ms;--t-reveal:620ms;
  --header-h:72px;--gutter:clamp(20px,4vw,40px);
}

/* 기본 */
*{box-sizing:border-box}
html{scroll-behavior:smooth;scroll-padding-top:calc(var(--header-h) + 24px)}
body{margin:0;background:var(--night);color:var(--text);font-family:var(--sans);font-size:var(--fs-m);line-height:1.7;word-break:keep-all;overflow-wrap:anywhere;text-wrap:pretty}
a{color:inherit;text-decoration:none}
button{font:inherit;color:inherit;cursor:pointer}
img{max-width:100%;height:auto;display:block}
figure,blockquote{margin:0}
h1,h2,h3,h4,p,dl{margin:0}
p+p{margin-top:18px}
h1,h2{font-family:var(--serif);font-weight:700;line-height:1.38;letter-spacing:-.04em;text-wrap:balance}
h1{font-size:var(--fs-display);line-height:1.3}
h2{font-size:var(--fs-xl);margin-bottom:28px}
h3{font-size:var(--fs-l);letter-spacing:-.025em;line-height:1.45;text-wrap:balance}
h4{font-size:20px;letter-spacing:-.015em;line-height:1.5}
b,strong{font-weight:650}
a,button,summary{-webkit-tap-highlight-color:transparent}
a:hover{text-decoration:underline;text-underline-offset:5px}
.button:hover,.brand:hover,.numbers a:hover,.guide-toc a:hover{text-decoration:none}
:focus-visible{outline:2px solid var(--apricot);outline-offset:2px;border-radius:4px}
.paper :focus-visible,.light-controls button:focus-visible{outline-color:var(--plum)}
.light-controls button:focus-visible{outline-color:var(--cream)}
.wrap{width:min(1080px,calc(100% - var(--gutter) * 2));margin-inline:auto}
.small,figcaption{font-size:var(--fs-xs);line-height:1.7;color:var(--muted)}
.eyebrow{font-size:var(--fs-xs);font-weight:600;letter-spacing:.08em;margin-bottom:24px;color:var(--muted)}
.eyebrow span{margin-left:22px;letter-spacing:0;font-weight:400}
.skip{position:absolute;left:24px;top:-90px;padding:12px 20px;background:var(--cream);color:var(--ink);z-index:40;border-radius:var(--radius-s)}
.skip:focus{top:12px}
kbd,code{font-family:var(--sans);font-size:.9em;border:1px solid var(--rule);border-radius:5px;padding:3px 7px;white-space:nowrap;font-variant-numeric:tabular-nums}
.paper kbd,.paper code{border-color:var(--rule-ink)}

/* 안전 줄 · 헤더 */
.safetyline{border-bottom:1px solid var(--rule-soft);font-size:var(--fs-xs);line-height:1.3}
.safetyline>.wrap{display:flex;align-items:center;gap:20px;min-height:44px}
.safetyline .wrap>div{display:flex;align-items:center;gap:5px}
.safetyline a{display:inline-flex;align-items:center;justify-content:center;min-width:44px;min-height:44px;font-weight:600;font-variant-numeric:tabular-nums}
.safetyhint{margin-left:auto;color:var(--muted)}
.header{position:sticky;top:0;z-index:30;background:rgba(42,35,40,.96);-webkit-backdrop-filter:blur(8px);backdrop-filter:blur(8px);border-bottom:1px solid transparent;transition:border-color var(--t-fast) var(--ease)}
.header.scrolled{border-bottom-color:var(--rule)}
.header-inner{display:flex;align-items:center;justify-content:space-between;min-height:var(--header-h);gap:20px}
.brand{display:flex;align-items:center;gap:12px;min-height:44px;font-size:19px;font-weight:650;line-height:1.2;letter-spacing:-.03em}
.brand img{width:40px;height:40px;border-radius:10px}
.brand small{display:block;font-size:var(--fs-xs);font-weight:400;color:var(--muted);letter-spacing:.05em;margin-top:4px}
.header nav{display:flex;align-items:center;gap:28px;font-size:var(--fs-s)}
.header nav>a{display:flex;align-items:center;min-height:44px}
.header a[aria-current=page]{text-decoration:underline;text-underline-offset:7px}
.nav-store{gap:8px;padding:0 14px;border:1px solid var(--rule);border-radius:999px;transition:border-color var(--t-fast) var(--ease),background var(--t-fast) var(--ease)}
.nav-store:hover{border-color:var(--muted);background:rgba(250,243,235,.06);text-decoration:none}
@supports (animation-timeline: scroll()){
  .header{animation:header-line linear both;animation-timeline:scroll();animation-range:0 48px}
  @keyframes header-line{from{border-bottom-color:transparent}to{border-bottom-color:var(--rule)}}
}

/* 버튼 · 링크 */
.button{display:inline-flex;align-items:center;justify-content:space-between;gap:24px;min-height:52px;padding:12px 22px;font-size:var(--fs-s);font-weight:650;border:1px solid transparent;border-radius:var(--radius-s);box-shadow:var(--shadow-1);transition:background var(--t-fast) var(--ease),box-shadow var(--t-fast) var(--ease),transform var(--t-fast) var(--ease)}
.button:hover{box-shadow:var(--shadow-1),var(--shadow-2)}
.button:active{transform:scale(.98)}
.button.cream{background:var(--cream);color:var(--ink)}
.button.cream:hover{background:var(--peach)}
.button.plum{background:var(--plum);color:#fff}
.button.plum:hover{background:var(--plum-deep)}
.text-link,.inline-link{display:inline-flex;align-items:center;gap:10px;min-height:44px;font-size:var(--fs-s);font-weight:600}
.inline-link{margin-top:12px}

/* 히어로 */
.hero{padding-top:clamp(28px,5vw,56px)}
.hero h1{max-width:850px}
.lead{font-size:var(--fs-m);line-height:1.8;color:var(--muted);max-width:560px;margin-top:24px}
.hero-actions{display:flex;align-items:center;gap:12px 24px;flex-wrap:wrap;margin-top:32px}
.hero-note{font-size:var(--fs-xs);letter-spacing:.02em;color:var(--muted);margin-top:20px}
.hero-note span{display:inline-block;margin-top:4px}
.open-letter{background:var(--cream);color:var(--ink);display:grid;grid-template-columns:1.23fr 1fr;padding:22px;gap:34px;margin-top:48px;min-height:516px;border-radius:var(--radius-s);box-shadow:var(--shadow-p1),var(--shadow-p2)}
.evening-art{position:relative;border-radius:4px;overflow:hidden;min-height:470px}
.evening-art img{width:100%;height:100%;position:absolute;inset:0;object-fit:cover;object-position:50% 78%}
.evening-art figcaption{position:absolute;inset:30px;color:var(--text);display:flex;flex-direction:column;align-items:flex-start}
.evening-art figcaption>span{font-size:var(--fs-xs)}
.evening-art blockquote{font-family:var(--serif);font-size:clamp(24px,2.3vw,30px);line-height:1.6;margin-top:28px;letter-spacing:-.025em}
.evening-art figcaption p{font-size:var(--fs-xs);margin-top:auto;background:rgba(42,35,40,.62);padding:4px 8px;border-radius:4px}
.hero-screen{padding:10px 12px 0;display:flex;flex-direction:column;align-items:center;min-width:0}
.mini-label{display:flex;justify-content:space-between;width:100%;font-size:var(--fs-xs);line-height:1.5;border-bottom:1px solid var(--rule-ink);padding-bottom:16px;margin-bottom:20px;color:var(--subink)}
.screen-crop{position:relative;width:min(100%,290px);height:414px;overflow:hidden;border-radius:var(--radius-l) var(--radius-l) 0 0;box-shadow:var(--shadow-p1),var(--shadow-p2)}
.screen-crop img{width:100%;height:auto}
.screen-crop::after{content:'';position:absolute;inset:auto 0 0;height:56px;background:linear-gradient(to bottom,rgba(252,246,235,0),var(--cream))}
.screen-caption{width:100%;margin-top:14px}
.screen-caption>span{font-size:var(--fs-s);font-weight:650;display:block}
.screen-caption>small{font-size:var(--fs-xs);color:var(--subink)}
.letter-foot{display:flex;justify-content:space-between;align-items:center;gap:20px;padding:16px 0;border-bottom:1px solid var(--rule);font-size:var(--fs-xs);color:var(--muted)}
.letter-foot a{display:flex;align-items:center;gap:14px;min-height:44px;white-space:nowrap}

/* 섹션 · 편지지 */
.section{margin-top:var(--space-section)}
.paper{background:var(--cream);color:var(--ink);border-radius:var(--radius-s);box-shadow:var(--shadow-p1),var(--shadow-p2)}
.paper .eyebrow,.paper .small,.paper figcaption,.paper p{color:var(--subink)}
.paper h2,.paper h3,.paper strong,.paper b{color:var(--ink)}
.paper a{color:var(--plum)}
.paper .button.plum{color:#fff}
.section-heading{margin-bottom:var(--space-block)}
.section-copy{min-width:0}
.section-copy>p{max-width:560px;color:var(--muted)}
.paper .section-copy>p{color:var(--subink)}
.section-copy h3{margin-bottom:16px}
.companion,.record-letter{display:grid;grid-template-columns:1.2fr 1fr;gap:52px;padding:clamp(30px,5vw,60px) clamp(22px,5vw,64px);align-items:start}
.letter-quote{font-family:var(--serif);font-size:var(--fs-l);line-height:1.7;margin:30px 0;color:var(--ink);letter-spacing:-.025em}
.care-paths>div{padding:16px 0;border-top:1px solid var(--rule-ink)}
.care-paths dt{font-size:16px;font-weight:650}
.care-paths dd{font-size:var(--fs-xs);line-height:1.7;color:var(--subink);margin:6px 0 0}
.split{display:grid;grid-template-columns:1fr 1fr;gap:80px;align-items:center}
.quiet-rule{margin-top:34px;padding-top:24px;border-top:1px solid var(--rule)}
.quiet-rule>span{font-size:var(--fs-s);font-weight:600}
.quiet-rule p{font-size:var(--fs-s);color:var(--muted);margin-top:12px}

/* 실제 화면 · 재현 UI */
.photo{background:#f9f7f5;overflow:hidden;position:relative;border-radius:var(--radius-m);border:1px solid var(--rule-ink-soft);box-shadow:var(--shadow-p1),var(--shadow-p2)}
.photo img{width:100%;height:auto}
.shot{width:100%;max-width:320px;justify-self:center}
.shot figcaption{display:flex;flex-wrap:wrap;align-items:center;gap:2px 14px;font-size:var(--fs-xs);margin-top:14px}
.shot figcaption a{display:inline-flex;min-height:44px;align-items:center;text-decoration:underline;text-underline-offset:4px}
.recreation figcaption{margin-top:14px}
.ui{font-size:var(--fs-s);line-height:1.6;padding:26px;background:var(--cream);color:var(--ink);border-radius:var(--radius-l);border:1px solid rgba(111,76,111,.16);box-shadow:var(--shadow-p1),var(--shadow-p2)}
.ui p{color:var(--subink)}
.ui-header{font-size:19px;font-weight:700;letter-spacing:-.035em;display:flex;justify-content:space-between;align-items:center;margin-bottom:20px;gap:15px}
.ui-mark{font-size:var(--fs-xs);color:var(--plum);font-weight:500}
.ui-segment{display:flex;font-size:var(--fs-xs);background:#e9e1df;padding:4px;border-radius:8px;margin-bottom:20px}
.ui-segment>span{width:50%;text-align:center;padding:4px}
.ui-segment>.selected{background:#fff;border-radius:5px;box-shadow:var(--shadow-p1)}
.ui-textbox{padding:20px 18px;background:#fff;min-height:100px;border:1px solid rgba(111,76,111,.14);border-radius:10px}
.ui-label{margin-top:24px!important;font-size:var(--fs-xs);font-weight:650;color:var(--ink)!important}
.weather{display:grid;grid-template-columns:repeat(5,1fr);gap:7px;margin-top:12px}
.mood{display:flex;flex-direction:column;align-items:center;gap:6px;color:#fff;font-size:var(--fs-xs);padding:10px 2px;border-radius:10px}
.mood svg{width:34px;height:32px}
.m0{background:linear-gradient(145deg,#4052ad,#528cdb)}
.m1{background:linear-gradient(145deg,#4d78c7,#52abe0)}
.m2{background:linear-gradient(145deg,#2e9ea8,#59c28a)}
.m3{background:linear-gradient(145deg,#f59433,#fabd40)}
.m4{background:linear-gradient(145deg,#f56b40,#ffb033)}
.mood>span{color:#271b24;background:rgba(252,246,235,.93);padding:2px 5px;border-radius:4px;white-space:nowrap}
.ui-small{font-size:var(--fs-xs);margin-top:12px!important}
.chips{display:flex;flex-wrap:wrap;gap:8px;margin-top:10px}
.chips span{padding:5px 12px;border-radius:30px;background:#ede7e8;color:var(--subink);font-size:var(--fs-xs)}
.ui-action{padding:12px 10px;border-radius:var(--radius-m);background:var(--plum);color:#fff;text-align:center;font-weight:600;margin-top:22px;font-size:var(--fs-xs)}
.ui-row{display:flex;align-items:center;justify-content:space-between;gap:20px;border-bottom:1px solid rgba(111,76,111,.14);padding:15px 0;font-size:var(--fs-xs)}
.ui-row b{color:var(--plum);font-size:var(--fs-xs)}

/* 두 통의 작은 편지 */
.two-letters{display:grid;grid-template-columns:1fr 1fr;gap:24px;align-items:stretch}
.little-letter{padding:38px}
.little-letter h3{font-family:var(--serif);font-weight:700;font-size:clamp(26px,2.3vw,30px);line-height:1.5;margin-bottom:20px}
.little-letter>p{font-size:16px}
.letter-index{font-size:var(--fs-xs)!important;letter-spacing:.06em;margin-bottom:22px!important;color:var(--muted)}
.little-letter .letter-index{color:var(--plum)}
.little-letter .ui{margin-top:30px;box-shadow:none;background:var(--paper-2);padding:22px;border-radius:var(--radius-m)}
.fragment{border-top:1px solid rgba(111,76,111,.12);padding:12px 0;display:grid;grid-template-columns:54px 1fr;gap:14px;align-items:start}
.fragment span{font-size:var(--fs-xs);font-weight:600;color:var(--plum);background:#ede5ec;border-radius:6px;text-align:center;padding:4px}
.fragment p{font-size:var(--fs-xs)!important;color:var(--ink)}
.relationship-shot{margin-top:30px;max-width:300px}
.little-letter .small{font-size:var(--fs-xs);margin-top:14px}

/* 빛 따라 — 시그니처 */
.light-split{align-items:start}
.light-demo{background:var(--surface);padding:24px;border:1px solid var(--rule-soft);border-radius:var(--radius-m);min-width:0;box-shadow:var(--shadow-1),var(--shadow-2)}
.light-demo-head{display:flex;justify-content:space-between;gap:12px;flex-wrap:wrap;font-size:var(--fs-xs);color:var(--muted)}
.light-stage{margin-top:18px;height:265px;border-radius:var(--radius-s);position:relative;overflow:hidden;background:radial-gradient(ellipse at 50% 55%,rgba(108,72,60,.3),transparent 60%),var(--night);touch-action:pan-y}
.lamp-track{position:absolute;inset:0;pointer-events:none;transform:translate(var(--lx,50%),var(--ly,55%));transition:transform 320ms var(--ease)}
.lamp{position:absolute;left:0;top:0;width:76px;height:76px;transform:translate(-50%,-50%)}
.lamp i{position:absolute;inset:0;border-radius:50%;background:radial-gradient(circle,var(--peach) 12%,rgba(232,151,105,.67) 36%,rgba(232,151,105,.2) 58%,transparent 75%);box-shadow:0 0 30px rgba(232,151,105,.15);transition:background 180ms var(--ease)}
.light-dot{position:absolute;left:var(--x);top:var(--y);width:10px;height:10px;border-radius:50%;background:var(--peach);box-shadow:0 0 15px rgba(232,151,105,.6);transform:translate(-50%,-50%);opacity:0;transition:opacity 180ms var(--ease),transform 300ms var(--ease)}
.d1{--x:18%;--y:28%}.d2{--x:43%;--y:20%}.d3{--x:76%;--y:25%}.d4{--x:85%;--y:54%}.d5{--x:68%;--y:80%}.d6{--x:31%;--y:77%}.d7{--x:13%;--y:57%}
.js .light-dot{opacity:1}
.js .light-dot.collected{opacity:0;transform:translate(-50%,-50%) scale(2.4)}
.js .light-stage{touch-action:none;cursor:crosshair}
.light-status{font-size:var(--fs-xs);margin-top:18px;min-height:48px;color:var(--text)}
.light-controls,.light-actions,.light-instruction{display:none}
.js .light-controls{display:flex;flex-wrap:wrap;gap:6px;margin-top:12px}
.light-controls button{width:44px;min-width:44px;min-height:44px;border:1px solid var(--muted);border-radius:50%;background:transparent;font-size:var(--fs-xs);font-variant-numeric:tabular-nums;transition:background var(--t-fast) var(--ease),border-color var(--t-fast) var(--ease),transform var(--t-fast) var(--ease)}
.light-controls button:hover{border-color:var(--cream)}
.light-controls button:active{transform:scale(.96)}
.light-controls button[aria-pressed=true]{background:var(--cream);color:var(--ink);border-color:var(--cream)}
.js .light-actions{display:flex;justify-content:space-between;flex-wrap:wrap;gap:10px;margin-top:14px}
.light-actions button{min-width:44px;min-height:44px;background:none;border:0;padding:4px 0;font-size:var(--fs-xs);text-decoration:underline;text-underline-offset:4px}
.js .light-instruction{display:block;margin-top:10px;font-size:var(--fs-xs)}
.light-demo.ended .light-stage{opacity:.5;transition:opacity 400ms var(--ease)}
/* 살구빛 숨 — 페이지에서 유일한 유휴 애니메이션. 화면 안에 있을 때만, reduce에서 끔 */
.js .light-demo.inview:not(.ended) .lamp i{animation:breath 7s ease-in-out infinite}
@keyframes breath{0%,100%{transform:scale(.96);opacity:.86}50%{transform:scale(1.07);opacity:1}}

/* 기록 · 연결 · 기기 */
.connection{display:grid;grid-template-columns:1.03fr 1fr;gap:64px;align-items:center}
.connection-art img{width:100%;border-radius:var(--radius-s);box-shadow:var(--shadow-1),var(--shadow-2)}
.connection-art>span{display:block;font-family:var(--serif);font-size:22px;line-height:1.6;margin-top:18px;text-align:center}
.device-spread{display:grid;grid-template-columns:1.15fr 1fr;gap:56px;align-items:start}
.ipad-shot{width:100%}
.ipad-shot img{border-radius:var(--radius-s);border:1px solid rgba(252,246,235,.2);box-shadow:var(--shadow-1),var(--shadow-2)}
.ipad-shot figcaption{margin-top:14px}
.device-notes article+article{border-top:1px solid var(--rule);margin-top:20px;padding-top:20px}
.device-notes h3{font-size:19px;margin-bottom:8px}
.device-notes p{font-size:var(--fs-s);color:var(--muted)}
.message-strip{display:grid;grid-template-columns:1fr 1fr 1fr;gap:24px;align-items:center;margin-top:38px}
.message-strip>div{background:var(--cream);color:var(--ink);padding:24px;border-radius:var(--radius-s);box-shadow:var(--shadow-p1),var(--shadow-p2)}
.message-strip>div>span{font-size:var(--fs-xs);color:var(--plum);font-weight:600}
.message-strip>div>p{font-family:var(--serif);font-size:17px;line-height:1.75;margin-top:12px}

/* 안전 */
.safety-section{border-top:1px solid var(--rule);padding-top:60px}
.safety-section>p:not(.eyebrow){color:var(--muted)}
.numbers{display:grid;grid-template-columns:repeat(3,1fr);gap:16px;margin-top:30px}
.numbers>a{display:flex;flex-direction:column;position:relative;min-height:157px;border-radius:var(--radius-m);padding:20px 24px;background:#ae3742;color:#fff!important;box-shadow:var(--shadow-1);transition:filter var(--t-fast) var(--ease),box-shadow var(--t-fast) var(--ease),transform var(--t-fast) var(--ease)}
.numbers>a:first-child{background:#b4540f}
.numbers>a:hover{filter:brightness(1.06);box-shadow:var(--shadow-1),var(--shadow-2)}
.numbers>a:active{transform:scale(.98)}
.numbers>a:focus-visible{outline-color:#fff}
.numbers strong{font-size:44px;letter-spacing:-.035em;font-variant-numeric:tabular-nums;line-height:1.3}
.numbers span{font-size:var(--fs-xs);line-height:1.5;margin-top:12px}
.numbers i{position:absolute;right:20px;top:22px;font-size:20px;font-style:normal}
.safety-details{display:grid;grid-template-columns:1fr 1fr;gap:40px;margin-top:30px;color:var(--muted);font-size:var(--fs-s)}
.safety-details p+p{margin-top:0}
.role-note{font-size:var(--fs-xs);border-left:2px solid var(--muted);padding-left:20px;margin-top:30px!important}

/* 사용법 4단계 · 개인정보 · 환경 */
.quick-guide{padding:clamp(30px,5vw,56px) clamp(22px,5vw,64px)}
.four-steps{list-style:none;padding:0;margin:0 0 36px;display:grid;grid-template-columns:1fr 1fr;gap:30px 42px}
.four-steps li{display:flex;gap:20px;align-items:flex-start}
.seal{display:inline-flex;align-items:center;justify-content:center;background:var(--plum);color:#fff;flex-shrink:0;font-size:var(--fs-xs);font-weight:650;width:40px;height:40px;border-radius:50%;border:3px double #a387a3;font-variant-numeric:tabular-nums}
.four-steps h3{font-size:19px;line-height:1.5;margin-bottom:6px}
.four-steps p{font-size:var(--fs-s)}
.privacy-ledger{border-top:1px solid var(--rule)}
.privacy-ledger>article{display:grid;grid-template-columns:80px 1fr;gap:28px;padding:30px 0;border-bottom:1px solid var(--rule)}
.privacy-ledger article>span{color:var(--apricot);font-size:var(--fs-xs);letter-spacing:.06em;padding-top:8px;font-variant-numeric:tabular-nums}
.privacy-ledger h3{font-size:22px;margin-bottom:12px}
.privacy-ledger p{color:var(--muted);font-size:16px;max-width:760px}
.privacy-links{display:flex;gap:30px;flex-wrap:wrap;margin-top:22px}
.environment{display:grid;grid-template-columns:1fr 1fr;gap:64px}
.environment h2{font-size:30px;margin-bottom:24px}
.environment>div>p{font-size:var(--fs-s);color:var(--muted)}
.price{font-family:var(--serif);font-size:32px!important;color:var(--text)!important;margin:26px 0 0!important}
.price span{display:block;font-family:var(--sans);font-size:var(--fs-xs);color:var(--muted);margin-top:8px}
.environment .button{margin-top:22px}
.requirements dl>div{display:grid;grid-template-columns:1fr 1.4fr;gap:20px;font-size:var(--fs-xs);padding:14px 0;border-bottom:1px solid var(--rule)}
.requirements dt{font-weight:600}
.requirements dd{margin:0;color:var(--muted);font-variant-numeric:tabular-nums}
.requirements>p{margin-top:20px;font-size:var(--fs-xs)}

/* FAQ · 마무리 · 푸터 */
.faq-list{max-width:840px}
.faq h2{margin-bottom:36px}
details{border-top:1px solid var(--rule)}
details:last-of-type{border-bottom:1px solid var(--rule)}
summary{display:flex;justify-content:space-between;align-items:center;gap:22px;list-style:none;cursor:pointer;font-size:17px;font-weight:550;line-height:1.6;min-height:72px;padding:16px 0}
summary::-webkit-details-marker{display:none}
summary:after{content:'+';font-weight:400;font-size:24px;flex-shrink:0;color:var(--muted);transition:transform 200ms var(--ease)}
details[open]>summary:after{content:'−'}
details>p,details>ol{margin:0;padding:4px 40px 24px 0;font-size:var(--fs-s);color:var(--muted)}
details>p+p{margin-top:0}
.faq>.text-link{margin-top:26px}
.closing{text-align:center;padding:clamp(64px,8vw,100px) 0 clamp(58px,7vw,88px);border-top:1px solid var(--rule);margin-top:var(--space-section)}
.closing h2{font-size:clamp(30px,3.6vw,44px)}
.closing>p:not(.eyebrow){font-family:var(--serif);font-size:clamp(20px,2vw,22px);line-height:1.8;color:var(--muted)}
.closing .button{margin-top:28px}
.closing>.text-link{display:flex;justify-content:center;margin-top:16px}
.footer{border-top:1px solid var(--rule);padding:38px 0 26px}
.footer-top{display:flex;justify-content:space-between;align-items:center;gap:28px}
.footer .brand{font-size:17px}
.footer .brand small{letter-spacing:0}
.footer-links{display:flex;gap:24px;font-size:var(--fs-xs)}
.footer-links a{display:flex;align-items:center;min-height:44px}
.family{display:flex;gap:24px;align-items:center;flex-wrap:wrap;margin-top:26px;font-size:var(--fs-xs);color:var(--muted)}
.family>span{margin-right:auto}
.family a{min-height:44px;display:flex;align-items:center}
.footer-bottom{display:flex;justify-content:space-between;gap:22px;border-top:1px solid var(--rule);margin-top:22px;padding-top:24px;font-size:var(--fs-xs);color:var(--muted)}

/* 여섯 통의 안내 편지 (guide/) */
.guide-hero{padding-top:clamp(28px,5vw,50px)}
.guide-hero h1{margin-bottom:26px}
.guide-hero .lead{margin-top:0}
.guide-hero>.small{margin-top:18px;max-width:680px}
.guide-toc{position:sticky;top:var(--header-h);z-index:20;margin-top:40px;background:rgba(42,35,40,.96);-webkit-backdrop-filter:blur(8px);backdrop-filter:blur(8px);border-top:1px solid var(--rule);border-bottom:1px solid var(--rule);scroll-margin-top:var(--header-h)}
.toc-toggle{display:none}
.toc-list{display:flex;flex-wrap:wrap;gap:0 8px;padding:6px 0}
.toc-list>a{display:flex;align-items:center;gap:10px;min-height:44px;padding:0 10px;margin-left:-10px;font-size:var(--fs-s);border-radius:var(--radius-s);transition:background var(--t-fast) var(--ease)}
.toc-list>a+a{margin-left:0}
.toc-list>a>span{font-size:var(--fs-xs);color:var(--apricot);font-variant-numeric:tabular-nums}
.toc-list>a:hover{background:rgba(250,243,235,.06)}
.toc-list>a[aria-current=true]{color:var(--text);box-shadow:inset 0 -2px 0 var(--apricot);border-radius:0}
.guide-start{display:flex;gap:28px;padding-top:40px;margin-top:40px;max-width:850px}
.guide-start h2{font-family:var(--sans);font-size:24px;font-weight:650;letter-spacing:-.025em;margin-bottom:14px}
.guide-start p{font-size:16px;color:var(--muted)}
.first-run-figure{margin:30px 0 0 68px;max-width:470px}
.first-run-figure figcaption{margin-top:12px}
.first-run-title{display:block;font-size:22px;line-height:1.55;letter-spacing:-.025em;margin-top:12px}
.manual-progress{height:4px;background:#e3d8e1;border-radius:6px;margin:22px 0;overflow:hidden}
.manual-progress>span{display:block;height:100%;width:16.666%;background:var(--plum);border-radius:6px;transform-origin:0 50%}
.first-run>p:not(.ui-small){font-size:var(--fs-xs);border-top:1px solid rgba(111,76,111,.12);padding-top:12px}
.guide-letter{padding:clamp(24px,4vw,42px) clamp(20px,4.5vw,48px);margin-top:70px;scroll-margin-top:calc(var(--header-h) + 72px)}
.guide-letter-top{display:flex;gap:18px;align-items:center;padding-bottom:26px;border-bottom:1px solid var(--rule-ink)}
.guide-letter-top>p{font-size:var(--fs-xs);font-weight:650;color:var(--plum)}
.guide-letter-top>a{margin-left:auto;min-width:44px;min-height:44px;display:flex;align-items:center;justify-content:flex-end;font-size:var(--fs-xs)}
.guide-letter-body{display:grid;grid-template-columns:1.35fr 1fr;gap:50px;margin-top:34px;align-items:start}
.guide-copy{min-width:0}
.guide-letter h2{font-size:clamp(26px,2.6vw,32px);line-height:1.5;margin-bottom:28px}
.guide-how{font-size:var(--fs-xs);letter-spacing:.04em;margin-bottom:16px}
.instructions{margin:0;padding-left:24px;color:var(--muted);font-size:var(--fs-m);line-height:1.8}
.instructions>li{padding-left:8px;margin-bottom:20px}
.paper .instructions{color:var(--subink)}
.instructions>li::marker{color:var(--apricot);font-size:var(--fs-xs);font-weight:600}
.paper .instructions>li::marker{color:var(--plum)}
.ui-pill{background:rgba(111,76,111,.08);color:var(--plum);border:1px solid rgba(111,76,111,.16);padding:1px 7px;border-radius:5px;font-size:.88em;line-height:1.7;white-space:nowrap}
.tip{margin-top:28px;padding:22px;border-left:2px solid var(--plum);background:rgba(232,218,202,.3);border-radius:0 var(--radius-s) var(--radius-s) 0}
.tip strong{font-size:var(--fs-xs);color:var(--plum)!important}
.tip p{font-family:var(--serif);font-size:17px;line-height:1.8;margin-top:10px;color:var(--ink)}
.in-letter{border-color:var(--rule-ink);margin-top:22px}
.in-letter summary{font-size:var(--fs-xs);min-height:56px}
.in-letter summary:after{color:var(--plum)}
.in-letter p{font-size:var(--fs-xs);padding-right:0}
.in-letter:last-of-type{border-bottom-color:var(--rule-ink)}
.guide-visual{min-width:0}
.guide-visual .ui{padding:22px}
.guide-visual>.small{margin-top:14px}
.guide-visual .shot{max-width:320px;margin:auto}
.guide-safety{margin-top:26px}
.guide-safety .small{margin-top:16px}
.guide-advanced{border-top:1px solid var(--rule);padding-top:60px}
.advanced-row{display:grid;grid-template-columns:1.3fr 1fr;gap:60px;padding:48px 0;border-bottom:1px solid var(--rule);align-items:start}
.advanced-row h3{font-family:var(--serif);font-size:26px;line-height:1.55;margin-bottom:22px}
.advanced-row>div>.small{margin-top:20px}
.advanced-row>div>p,.tool-list p,.device-guide article>p,.guide-support p{font-size:var(--fs-m)}
.tool-guide{padding-top:48px}
.tool-guide>h3{font-size:26px;margin-bottom:20px}
.tool-guide>p:not(.letter-index){color:var(--muted);max-width:750px}
.tool-list{display:grid;grid-template-columns:1fr 1fr;gap:28px 40px;margin-top:32px}
.tool-list>div{display:grid;grid-template-columns:34px 1fr;column-gap:14px;border-top:1px solid var(--rule);padding-top:20px}
.tool-list span{font-size:var(--fs-xs);color:var(--apricot);padding-top:5px;font-variant-numeric:tabular-nums}
.tool-list h4{font-size:18px}
.tool-list p{grid-column:2;font-size:var(--fs-s)!important;color:var(--muted);margin-top:10px}
.advanced-details{margin-top:40px}
.advanced-details summary{font-size:17px}
.detail-ui{max-width:470px;margin-bottom:26px}
.detail-ui .ui-small{color:var(--subink)}
.scene-placeholder{min-height:125px;border:1px dashed rgba(111,76,111,.4);border-radius:var(--radius-m);background:#e6ddd3;display:flex;align-items:center;justify-content:center;font-size:var(--fs-xs);color:var(--subink)}
.device-guide{border-top:1px solid var(--rule);padding-top:60px}
.device-guide>article{padding:44px 0;border-bottom:1px solid var(--rule)}
.device-guide h3{font-family:var(--serif);font-size:26px;margin-bottom:22px}
.device-guide article>p{color:var(--muted)}
.watch-guide,.tv-guide{display:grid;grid-template-columns:1.3fr 1fr;gap:60px;align-items:center}
.watch-guide p{font-size:var(--fs-s);color:var(--muted)}
.watch-guide figure{justify-self:center;max-width:280px;text-align:center}
.watch-guide figcaption{margin-top:18px}
/* Apple Watch 비율 1:1.22 · 다섯 상태 중 앞부분을 크롭 */
.watch-ui{width:208px;height:254px;overflow:hidden;background:#201b1f;border:1px solid rgba(173,135,155,.4);border-radius:48px;padding:22px 16px 0;color:var(--cream);font-size:var(--fs-xs);text-align:center;margin:auto;box-shadow:var(--shadow-1),var(--shadow-2)}
.watch-ui>span{font-size:var(--fs-xs);color:var(--apricot)}
.watch-ui strong{display:block;font-size:17px;line-height:1.45;margin:8px 0 14px}
.watch-ui>div{border-radius:14px;padding:7px 0;background:#41343d;margin-top:8px}
.tv-guide figure img{border-radius:var(--radius-s);box-shadow:var(--shadow-1),var(--shadow-2)}
.tv-guide figcaption{margin-top:14px}
.message-examples{display:grid;grid-template-columns:1fr 1fr;gap:18px;margin-top:26px}
.message-examples>div{background:var(--cream);color:var(--ink);padding:24px;border-radius:var(--radius-s);box-shadow:var(--shadow-p1),var(--shadow-p2)}
.message-examples h4{font-size:var(--fs-xs);color:var(--plum)}
.message-examples p{font-family:var(--serif);font-size:18px;line-height:1.75;margin-top:14px}
.message-guide .small{margin-top:18px}
.guide-support{margin-top:32px}
.guide-support p{color:var(--muted);margin-bottom:22px}
.guide-support .text-link{margin-left:24px}
.missing{padding:100px 0 150px;min-height:68vh}
.missing h1{margin-bottom:28px}
.missing>p:not(.eyebrow){color:var(--muted)}
.missing .hero-actions{margin-top:32px}

/* ───────── 모션 언어: 편지를 펼치는 손 ─────────
   1 펼침(unfold) 2 줄 단위 등장(lines) 3 봉랍 찍힘(seal) 4 살구빛 숨(breath) 5 미세 상호작용 160ms
   본문은 처음부터 보이고, html.js일 때만 숨김. opacity·transform만 움직인다. */
.js [data-reveal]{opacity:0;transform:translateY(14px);transition:opacity var(--t-reveal) var(--ease),transform var(--t-reveal) var(--ease);transition-delay:calc(var(--i,0) * 80ms)}
.js [data-reveal=unfold]{transform:perspective(1400px) rotateX(-7deg) translateY(16px);transform-origin:50% 0}
.js [data-reveal].in{opacity:1;transform:none}
.js .lines>span{display:inline-block;opacity:0;transform:translateY(.4em);transition:opacity 560ms var(--ease),transform 560ms var(--ease);transition-delay:calc(var(--i,0) * 90ms)}
.js .lines.in>span{opacity:1;transform:none}
.js [data-reveal] .seal{transform:scale(.6);transition:transform 420ms var(--ease);transition-delay:calc(var(--i,0) * 80ms + 160ms)}
.js [data-reveal].in .seal{transform:none}
.js .hero-visual{transition:opacity 560ms var(--ease),transform 680ms var(--ease)}
.js .hero-visual .evening-art blockquote span,.js .hero-visual .evening-art figcaption>p{display:inline-block;transition:opacity 500ms var(--ease),transform 500ms var(--ease);transition-delay:calc(240ms + var(--i,0) * 90ms)}
.js .hero-visual .evening-art figcaption>p{display:block;--i:2}
.js .hero-visual .evening-art blockquote span{opacity:1;transform:none} /* 히어로 인용은 IO 대상이 아니다: 첫 그림에서 바로 자리 잡는다 */
@starting-style{
  .js .hero-visual{opacity:0;transform:perspective(1400px) rotateX(-6deg) translateY(16px)}
  .js .hero-visual .evening-art blockquote span,.js .hero-visual .evening-art figcaption>p{opacity:0;transform:translateY(.4em)}
}
.hero-visual{transform-origin:50% 0}

/* 반응형 */
@media(max-width:1000px){
  .hero-actions{gap:12px 20px}
  .companion,.record-letter{gap:32px}
  .split{gap:36px}
  .open-letter{gap:22px;min-height:460px}
  .evening-art{min-height:420px}
  .evening-art figcaption{inset:22px}
  .little-letter{padding:28px}
  .connection,.device-spread{gap:32px}
  .message-strip{gap:16px}
  .message-strip>div{padding:18px}
  .message-strip>div>p{font-size:15px}
  .environment{gap:32px}
  .numbers>a{padding:18px}
  .guide-letter-body{gap:28px;grid-template-columns:1.15fr 1fr}
  .advanced-row,.watch-guide,.tv-guide{gap:32px}
  .light-demo{padding:18px}
  .guide-visual .ui{padding:18px}
  .weather{gap:4px}
  .mood>span{padding:2px}
  .environment .button{gap:16px;padding-inline:18px}
}
@media(min-width:681px) and (max-width:900px){
  .split,.companion,.record-letter,.connection,.device-spread,.environment,.guide-letter-body,.advanced-row,.watch-guide,.tv-guide{grid-template-columns:1fr;gap:32px}
  .section-copy>p,.guide-copy{max-width:640px}
  .two-letters{grid-template-columns:1fr}
  .little-letter{padding:36px}
  .recreation,.guide-visual,.advanced-row>.ui,.light-demo{max-width:560px;width:100%;justify-self:start}
  .ipad-shot{max-width:600px;justify-self:center}
  .requirements{max-width:640px}
  .header nav{gap:20px}
}
@media(max-width:680px){
  body{line-height:1.7}
  h1{line-height:1.4;letter-spacing:-.035em}
  h2{line-height:1.45;margin-bottom:22px}
  .header .brand{font-size:18px;gap:10px}
  .header nav{gap:14px;font-size:var(--fs-xs)}
  .header nav>a:nth-child(2){display:none}
  .nav-store{padding:0 12px}
  .safetyline .wrap{gap:10px}
  .safetyline .wrap>div{gap:0}
  .safetyhint{display:none}
  .eyebrow{margin-bottom:22px}
  .eyebrow span{display:block;margin:6px 0 0}
  .lead{margin-top:20px}
  .hero-actions{margin-top:24px;gap:8px 18px}
  .button{font-size:var(--fs-xs);padding:12px 18px;gap:18px}
  .hero-note{margin-top:12px;letter-spacing:0}
  .open-letter{display:block;padding:14px;margin-top:28px;min-height:0}
  .evening-art{min-height:396px}
  .evening-art figcaption{inset:22px}
  .evening-art blockquote{margin-top:24px;line-height:1.65}
  .evening-art img{object-position:50% 70%}
  .hero-screen{padding:28px 12px 14px}
  .mini-label{margin-bottom:18px}
  .screen-crop{width:100%;max-width:290px}
  .screen-caption{margin-top:18px}
  .letter-foot{display:block;padding:18px 0}
  .letter-foot a{margin:6px 0 0;white-space:normal}
  .companion,.record-letter{display:flex;flex-direction:column;gap:30px}
  .letter-quote{margin:24px 0}
  .shot,.guide-visual .shot,.relationship-shot{width:100%;max-width:290px;align-self:center}
  .split{display:flex;flex-direction:column;gap:28px;align-items:stretch}
  .ui{padding:22px 18px}
  .ui-header{font-size:17px}
  .mood{padding:8px 1px}
  .mood svg{width:30px;height:29px}
  .weather{gap:5px}
  .quiet-rule{margin-top:22px;padding-top:20px}
  .two-letters{display:block}
  .little-letter{padding:30px 22px}
  .little-letter+.little-letter{margin-top:24px}
  .little-letter>p{font-size:var(--fs-m)}
  .letter-index{margin-bottom:16px!important}
  .little-letter .ui{padding:20px 16px;margin-top:24px}
  .relationship-shot{margin-top:24px}
  .light-demo{padding:18px;margin-top:8px}
  .light-stage{height:232px}
  .light-status{min-height:44px;margin-top:14px}
  .js .light-controls{display:grid;grid-template-columns:repeat(7,1fr);gap:5px}
  .light-controls button{width:auto;min-width:0;border-radius:22px}
  .connection{display:flex;flex-direction:column;gap:32px}
  .connection-art>span{font-size:20px;margin-top:16px}
  .device-spread{display:flex;flex-direction:column;gap:28px}
  .device-notes h3{font-size:18px}
  .device-notes p{font-size:var(--fs-m)}
  .ipad-shot figcaption{margin-top:10px}
  .message-strip{grid-template-columns:1fr;gap:14px;margin-top:28px}
  .message-strip>div{padding:24px}
  .message-strip>div>p{font-size:18px}
  .safety-section{padding-top:36px}
  .numbers{grid-template-columns:1fr;gap:12px;margin-top:24px}
  .numbers>a{padding:18px 22px;min-height:100px;display:grid;grid-template-columns:82px 1fr;gap:0 18px;align-items:center}
  .numbers strong{font-size:38px;grid-row:1/3}
  .numbers span{margin-top:0;padding-right:14px}
  .numbers i{font-size:18px;right:18px;top:18px}
  .safety-details{display:block;margin-top:24px}
  .safety-details>p+p{margin-top:18px}
  .role-note{padding-left:16px;margin-top:24px!important}
  .four-steps{grid-template-columns:1fr;gap:22px;margin-bottom:24px}
  .four-steps li{gap:16px}
  .four-steps h3{font-size:17px}
  .seal{width:36px;height:36px}
  .quick-guide .button{width:100%;gap:12px;padding-inline:15px}
  .privacy-ledger>article{grid-template-columns:24px 1fr;gap:18px;padding:22px 0}
  .privacy-ledger h3{font-size:18px}
  .privacy-ledger p{font-size:var(--fs-m)}
  .privacy-ledger article>span{padding-top:5px}
  .privacy-links{display:block;margin-top:18px}
  .environment{display:block}
  .environment h2{font-size:26px}
  .requirements{margin-top:32px}
  .requirements dl>div{grid-template-columns:1fr;gap:6px;font-size:var(--fs-s)}
  .price{font-size:30px!important}
  .faq h2{margin-bottom:26px}
  summary{font-size:var(--fs-s);min-height:64px;gap:18px;padding:14px 0}
  details>p,details>ol{padding-right:18px}
  .footer{padding:28px 0 22px}
  .footer-top{display:block}
  .footer .brand{font-size:16px}
  .footer-links{margin-top:18px;gap:18px}
  .family{gap:6px 20px;margin-top:20px}
  .family>span{flex-basis:100%}
  .footer-bottom{display:block;margin-top:18px;padding-top:18px}
  .footer-bottom>span{display:block}
  .footer-bottom>span+span{margin-top:10px}
  /* 가이드 */
  .guide-hero h1{margin-bottom:20px}
  .guide-toc{margin-top:28px}
  .js .toc-toggle{display:flex;align-items:center;justify-content:space-between;gap:12px;width:100%;min-height:48px;padding:0;background:none;border:0;font-size:var(--fs-s);text-align:left}
  .toc-toggle>span{color:var(--muted);font-size:var(--fs-xs);min-width:0;overflow:hidden;text-overflow:ellipsis;white-space:nowrap}
  .toc-toggle>span b{color:var(--apricot);font-weight:600;margin-right:6px}
  .toc-toggle::after{content:'+';font-size:22px;color:var(--muted);flex-shrink:0}
  .toc-toggle[aria-expanded=true]::after{content:'−'}
  .js .toc-toggle[aria-expanded=false]+.toc-list{display:none}
  .toc-list{gap:0;padding:0 0 10px}
  .toc-list>a{width:100%;margin-left:0;padding:0 4px}
  .guide-start{gap:18px;padding-top:28px;margin-top:32px}
  .guide-start h2{font-size:20px}
  .guide-start p{font-size:var(--fs-m)}
  .first-run-figure{margin-left:0}
  .first-run-title{font-size:20px}
  .guide-letter{margin-top:42px;scroll-margin-top:calc(var(--header-h) + 64px)}
  .guide-letter-top{gap:10px;flex-wrap:wrap;padding-bottom:18px}
  .guide-letter-top>p{flex:1}
  .guide-letter-body{display:flex;flex-direction:column;gap:28px;margin-top:26px}
  .guide-letter h2{margin-bottom:22px}
  .instructions{padding-left:20px}
  .instructions>li{padding-left:5px;margin-bottom:18px}
  .tip{padding:18px;margin-top:22px}
  .tip p{font-size:16px}
  .guide-visual{width:100%}
  .guide-visual .ui{padding:20px 16px}
  .guide-advanced{padding-top:36px}
  .advanced-row{display:block;padding:32px 0}
  .advanced-row h3{font-size:24px}
  .advanced-row>.ui,.advanced-row>.shot{margin:28px auto 0}
  .tool-guide{padding-top:32px}
  .tool-guide h3{font-size:22px}
  .tool-list{grid-template-columns:1fr;gap:20px;margin-top:26px}
  .tool-list>div{grid-template-columns:24px 1fr;gap:0 14px;padding-top:18px}
  .tool-list h4{font-size:17px}
  .advanced-details summary{font-size:var(--fs-s)}
  .advanced-details .instructions{padding-right:8px}
  .detail-ui{max-width:100%}
  .ui-row{gap:14px}
  .device-guide{padding-top:36px}
  .device-guide>article{padding:32px 0}
  .device-guide h3{font-size:22px}
  .watch-guide,.tv-guide{display:block}
  .watch-guide>figure{margin:28px auto 0;max-width:280px}
  .tv-guide figure{margin-top:28px}
  .message-examples{grid-template-columns:1fr;gap:14px;margin-top:20px}
  .message-examples>div{padding:22px}
  .message-examples p{font-size:17px}
  .guide-support .text-link{display:flex;margin:12px 0 0}
  .missing{padding:70px 0 100px;min-height:70vh}
}

/* 감소 모션: 모든 이동·호흡을 끄고 즉시 최종 상태 */
@media(prefers-reduced-motion:reduce){
  html{scroll-behavior:auto}
  .js [data-reveal],.js .lines>span,.js [data-reveal] .seal,.js .hero-visual,.js .hero-visual .evening-art blockquote span,.js .hero-visual .evening-art figcaption>p{opacity:1!important;transform:none!important;transition:none!important}
  .js .light-demo.inview:not(.ended) .lamp i{animation:none}
  .lamp-track{transition:none}
  .lamp,.lamp i,.light-dot,.button,.numbers>a,.light-controls button,.header,.light-demo.ended .light-stage,summary:after{transition:none!important}
  .header{animation:none}
}