:root{--paper:#f7f8f5;--ink:#30372f;--muted:#6c726a;--line:#dce0d7;--red:#a83d31;--tray:#e9ede4;--font:'Familjen Grotesk','Noto Sans KR',sans-serif}
*{box-sizing:border-box}
html{min-width:320px;background:var(--paper)}
body{margin:0;color:var(--ink);font:16px/1.5 var(--font);-webkit-font-smoothing:antialiased}
button,input{font:inherit;color:inherit}
button{cursor:pointer;-webkit-tap-highlight-color:transparent}
button:disabled{cursor:default;opacity:.45}
[hidden]{display:none!important}
button:focus-visible,input:focus-visible,summary:focus-visible{outline:2px solid var(--red);outline-offset:5px}
h1:focus,h2:focus{outline:none}
h1,h2,h3,p{margin-top:0}
h1,h2,h3{font-weight:500;letter-spacing:-.045em}
h2{margin-bottom:15px;font-size:34px;line-height:1.12}
h3{font-size:24px;line-height:1.2}
button{border:0;background:none}
.app-shell{max-width:1032px;margin:auto;padding:20px 36px 32px}
.prototype-bar{display:flex;justify-content:space-between;color:var(--muted);font-size:11px}
.prototype-bar button{padding:0;text-decoration:underline;text-underline-offset:3px}
.app-header{display:flex;justify-content:space-between;align-items:center;padding:25px 0 18px}
.brand{display:flex;gap:9px;align-items:baseline;padding:0}
.brand>span{font-size:32px;font-weight:600;letter-spacing:-2px;line-height:1}
.brand small{font-size:13px;color:var(--red)}
.header-link{font-size:13px;padding:9px 16px;border-radius:18px;background:#eef0e9;box-shadow:inset 0 1px 0 #fff,0 2px 0 #d5dacf}
main{max-width:440px;margin:auto}
.screen{padding:20px 0 30px}
.landing{text-align:center;padding-top:37px}
.landing h1{font-size:48px;line-height:1.02;margin:0 0 22px}
.intro{font-size:16px;line-height:1.5;color:var(--muted);margin-bottom:28px}
.landing-art{max-width:410px;margin:24px auto 30px;transform:perspective(900px) rotateX(18deg) rotateZ(-10deg)}
.landing-art svg{display:block;width:100%;height:270px;overflow:visible;filter:drop-shadow(4px 17px 10px #30372f24)}
.landing .primary{max-width:320px}
.primary{width:100%;min-height:52px;padding:14px 18px;background:linear-gradient(165deg,#505c4b,#354130);color:#fff;border-radius:15px;border:1px solid #36412f;font-size:15px;font-weight:500;box-shadow:inset 0 1px 0 #ffffff30,0 4px 0 #253021,0 7px 10px #27332318;transition:transform 140ms,box-shadow 140ms}
.primary:hover{background:linear-gradient(165deg,#5a6753,#3d4b37)}
.primary:active{transform:translateY(3px);box-shadow:inset 0 1px 3px #18231535,0 1px 0 #253021,0 2px 4px #27332318}
.quiet{display:block;width:100%;min-height:44px;padding:12px 0;margin-top:9px;color:var(--muted);font-size:14px}
.quiet:hover{text-decoration:underline;text-underline-offset:4px;color:var(--ink)}
.micro{font-size:11px;line-height:1.5;color:var(--muted);text-align:center;margin:12px 0 0}
.definition{max-width:265px;margin:36px auto 0;font-size:12px;color:var(--muted)}
.definition strong{display:block;color:var(--ink);margin-bottom:4px;font-weight:500}
.back{display:inline-flex;align-items:center;gap:9px;min-height:40px;margin:0 0 28px;padding:0;font-size:13px;color:var(--muted)}
.back::before{content:'‹';font-size:20px}
form{display:grid;gap:22px}
label:not(.check){display:grid;gap:8px;font-size:13px}
label small{display:inline;color:var(--muted);font-size:11px}
input:not([type=checkbox]){width:100%;min-width:0;height:51px;padding:11px 15px;border:1px solid #d8ddd2;border-radius:12px;background:#f0f2ed;box-shadow:inset 0 2px 4px #35442b0b,0 1px 0 #fff;font-size:16px}
.field-row{display:grid;grid-template-columns:1fr 1.2fr;gap:16px}
.field-row label{position:relative}
.field-row label small{position:absolute;right:0;top:2px}
.privacy{font-size:13px;color:var(--muted);margin:0}
.check{display:flex;align-items:flex-start;gap:10px;font-size:13px;color:var(--muted)}
.check input{flex-shrink:0;accent-color:var(--red);width:16px;height:16px;margin:2px 0 0}
.field-error{color:var(--red);font-size:13px;margin:0}
.piece-screen .back{margin-bottom:0}
.personal-piece{width:220px;margin:14px auto 26px;transform:perspective(650px) rotateX(15deg) rotateZ(-8deg)}
.personal-piece svg{display:block;width:100%;height:218px;overflow:visible;filter:drop-shadow(5px 15px 9px #30372f25)}
.eyebrow{font-size:13px;margin:0 0 8px;color:var(--muted)}
.piece-screen h2{font-size:38px;margin-bottom:18px}
.piece-reading{font-size:20px;line-height:1.45;letter-spacing:-.2px;margin:0 0 22px}
.piece-facts{display:flex;justify-content:space-between;font-size:13px;color:var(--muted);padding:17px 0;border-top:1px solid var(--line);margin-bottom:20px}
.section-nav{display:flex;justify-content:space-between;align-items:center;margin-bottom:19px}
.section-nav .back{margin:0}
.subtle{font-size:13px;color:var(--muted);text-decoration:underline;text-underline-offset:4px;padding:10px 0}
.puzzle-screen h2{margin-bottom:10px}
.puzzle-screen>.intro{margin-bottom:23px}
.puzzle-toolbar{display:flex;justify-content:space-between;align-items:center;gap:10px;font-size:12px;color:var(--muted);margin:0 0 12px}
.view-switch{display:flex;gap:2px;background:#e7ebe2;border-radius:12px;padding:4px;box-shadow:inset 0 1px 3px #2c38261a,0 1px 0 #fff}
.view-switch button{min-height:31px;padding:5px 12px;font-size:12px;border-radius:9px;color:var(--muted)}
.view-switch button[aria-pressed=true]{background:linear-gradient(#fff,#f3f5f0);color:var(--ink);box-shadow:0 2px 3px #34432920,0 1px 0 #b8c0b0}
.puzzle-canvas{position:relative;height:370px;overflow:hidden;background:var(--tray);border:7px solid #f0f3ec;border-radius:29px;box-shadow:inset 0 3px 8px #34412b16,inset 0 -1px 2px #fff,0 1px 0 #fff,0 4px 0 #d6dccf,0 9px 16px #303b2710}
#puzzleBoard{display:block;width:100%;height:100%;touch-action:none;cursor:grab}
#puzzleBoard.is-dragging{cursor:grabbing}
.puzzle-piece{cursor:pointer}
.puzzle-piece text{font-family:var(--font);pointer-events:none;text-anchor:middle;fill:#2b2c28}
.puzzle-piece .piece-letter{font-size:27px;font-weight:500;letter-spacing:-1px}
.puzzle-piece .piece-name{font-size:12px;font-weight:500}
.puzzle-piece .piece-inner{transition:transform 160ms cubic-bezier(.2,.8,.3,1)}
.puzzle-piece .piece-bevel,.puzzle-piece .piece-shadow{pointer-events:none}
.puzzle-piece.has-light-ink text{fill:#fff9ed}
.puzzle-piece:focus{outline:none}
.puzzle-piece:focus-visible .piece-body{stroke:var(--ink);stroke-width:3}
@media(hover:hover){.puzzle-piece[role=button]:not(.is-ghost):hover .piece-inner{transform:translateY(-3px)}}
.puzzle-piece[role=button]:active .piece-inner{transform:translateY(2px)}
.puzzle-piece .piece-focus{fill:none;stroke:var(--ink);stroke-width:2;opacity:0;pointer-events:none}
.puzzle-piece.is-selected .piece-focus{opacity:1}
.puzzle-piece.is-ghost .piece-body{fill:#f4f6f030;stroke:#858d7e;stroke-width:1;stroke-dasharray:3 3}
.puzzle-piece.is-ghost text{fill:#6e7065}
.puzzle-piece.is-new .piece-inner{animation:piece-arrives 600ms cubic-bezier(.2,.8,.3,1) both}
@keyframes piece-arrives{0%{opacity:0;transform:translate(22px,-36px) rotate(9deg)}75%{opacity:1;transform:translate(0,2px) rotate(0)}100%{opacity:1;transform:translate(0,0) rotate(0)}}
.zoom-controls{position:absolute;bottom:12px;right:12px;display:flex;align-items:center;padding:3px;background:#f8faf4f5;border:1px solid #fff;border-radius:12px;box-shadow:0 2px 0 #c8d0bf,0 4px 8px #33422a10}
.zoom-controls button{min-width:34px;height:34px;padding:0 8px;font-size:17px}
.zoom-controls #fitButton{font-size:12px}
.board-caption{text-align:center;font-size:11px;color:var(--muted);margin:11px 0 0}
.puzzle-invite{margin:27px 0 0}
.puzzle-invite p{font-size:15px;margin-bottom:12px}
.demo-controls{display:flex;flex-wrap:wrap;justify-content:center;align-items:center;gap:4px 16px;margin:19px 0 0;font-size:11px}
.demo-controls>span{width:100%;text-align:center;color:var(--muted)}
.demo-controls button{min-height:35px;padding:4px 0;color:var(--muted);text-decoration:underline;text-underline-offset:3px}
.beyond{margin-top:31px;padding-top:22px;border-top:1px solid var(--line)}
.beyond p{font-size:13px;margin-bottom:4px;color:var(--muted)}
.beyond button{min-height:40px;padding:0;font-size:14px}
.beyond button span{margin-left:9px;color:var(--red)}
.search-label{margin-bottom:12px}
.people-list{max-height:360px;overflow:auto;min-height:240px}
.person-row{display:grid;width:100%;grid-template-columns:47px 1fr auto;align-items:center;gap:12px;padding:12px 0;border-bottom:1px solid var(--line);text-align:left}
.person-row svg{width:45px;height:45px;overflow:visible}
.person-row strong{display:block;font-weight:500;font-size:15px}
.person-row small{font-size:12px;color:var(--muted)}
.person-row>span:last-child{font-size:13px;color:var(--muted)}
.list-empty{color:var(--muted);font-size:14px;padding:30px 0}
.campus-art{width:250px;margin:4px auto 30px}
.campus-art svg{width:100%;height:160px;overflow:visible}
.pair-art{width:100%;max-width:310px;margin:5px auto 28px}
.pair-art svg{width:100%;height:190px;display:block;overflow:visible;transform:perspective(800px) rotateX(12deg) rotateZ(-6deg);filter:drop-shadow(3px 12px 7px #30372f20)}
.campus-art svg{filter:drop-shadow(3px 10px 7px #30372f20)}
.school-name{font-size:12px;color:var(--muted)}
.result-meta{display:flex;justify-content:space-between;align-items:center;gap:12px;margin-bottom:15px;font-size:13px;color:var(--muted)}
.result-meta strong{font-weight:500;color:var(--ink);font-size:25px;letter-spacing:-1px}
.request-status,.accepted{border-top:1px solid var(--line);padding-top:25px}
.request-status h3,.accepted h3{margin-bottom:12px}
.request-status>p,.accepted>p{font-size:14px;color:var(--muted)}
.chat-messages{max-height:240px;overflow:auto;margin:22px 0 14px;display:flex;flex-direction:column;gap:9px}
.chat-messages p{padding:11px 14px;max-width:86%;margin:0;font-size:14px;overflow-wrap:anywhere;border-radius:8px}
.received{background:#eae9e1;align-self:flex-start}
.sent{background:#dce6d5;align-self:flex-end}
.chat-form{grid-template-columns:1fr auto;gap:8px}
.chat-form button{background:var(--ink);color:white;border-radius:12px;padding:0 15px;font-size:13px;box-shadow:inset 0 1px 0 #ffffff25,0 3px 0 #222b1c}
footer{text-align:center;font-size:11px;color:var(--muted);margin:26px 0 0}
dialog{width:min(430px,calc(100% - 28px));max-height:calc(100svh - 40px);overflow:auto;overscroll-behavior:contain;padding:22px 28px 25px;background:var(--paper);color:var(--ink);border:1px solid #fff;border-radius:28px;box-shadow:0 6px 0 #d9dfd2,0 24px 60px #1f2b2733}
dialog::backdrop{background:#28332859;backdrop-filter:blur(5px)}
.dialog-close{display:block;width:36px;height:36px;margin:0 -10px 8px auto;font-size:25px;color:var(--muted);border-radius:50%;background:#eaeee4;box-shadow:inset 0 1px 0 #fff,0 2px 0 #d4dacd}
dialog h2{font-size:29px;line-height:1.15}
dialog>p{font-size:16px;color:var(--muted);line-height:1.5}
.full-reading{border-top:1px solid var(--line);padding-top:19px;margin-top:20px;font-size:16px}
.full-reading .reading-note{font-size:12px;color:var(--muted);margin-top:20px}
.invite-tray{width:235px;margin:20px auto 30px;padding:13px 20px 18px;border:7px solid #f0f3ec;border-radius:25px;background:var(--tray);text-align:center;transform:rotate(-5deg);box-shadow:inset 0 2px 6px #35412d16,0 4px 0 #d2d9c9,0 9px 16px #303b2712}
.invite-tray>div{width:140px;margin:auto}
.invite-tray svg{width:100%;height:145px;overflow:visible;filter:drop-shadow(2px 6px 4px #30372f20)}
.invite-tray>span{font-size:12px;color:#4f5948}
.invite-dialog h2{text-align:center}
.invite-dialog>p{text-align:center}
.receipt{margin:25px 0}
.receipt>div{display:flex;justify-content:space-between;font-size:14px;border-top:1px solid var(--line);padding:12px 0}
.download-link{display:block;text-align:center;text-decoration:none;cursor:pointer}
#exportPreview{display:block;width:100%;height:auto;margin:15px 0 20px;border:1px solid var(--line);border-radius:16px}
dt{color:var(--muted)}dd{margin:0}
#toast{position:fixed;bottom:20px;left:50%;z-index:100;transform:translate(-50%,8px);background:var(--ink);color:white;width:max-content;max-width:calc(100vw - 30px);padding:11px 16px;font-size:13px;border-radius:6px;opacity:0;pointer-events:none;transition:opacity 140ms,transform 140ms}
#toast.is-visible{opacity:1;transform:translate(-50%,0)}
.sr-only{position:absolute;width:1px;height:1px;overflow:hidden;clip:rect(0,0,0,0);white-space:nowrap}
@media(min-width:900px){.app-header{padding-bottom:30px}.landing{padding-top:20px}.landing-art svg{height:285px}.puzzle-canvas{height:390px}}
@media(max-width:600px){.app-shell{padding:13px 24px 26px}.app-header{padding:23px 0 16px}.brand>span{font-size:29px}.screen{padding-top:14px}.landing{padding-top:24px}.landing h1{font-size:42px}.landing-art{margin:13px auto 25px}.landing-art svg{height:238px}.landing .intro{margin-bottom:18px}h2{font-size:31px}.puzzle-canvas{height:335px;margin-left:-7px;margin-right:-7px}.puzzle-screen>.intro{font-size:14px}.personal-piece{width:180px;margin:5px auto 24px}.personal-piece svg{height:194px}.piece-screen h2{font-size:34px}.piece-reading{font-size:18px}.definition{margin-top:28px}}
@media(max-width:360px){.app-shell{padding-left:20px;padding-right:20px}.landing h1{font-size:38px}.field-row{grid-template-columns:1fr}.puzzle-canvas{height:310px}.view-switch button{padding-left:9px;padding-right:9px}.result-meta{font-size:12px}dialog{padding-left:23px;padding-right:23px}}
@media(prefers-reduced-motion:reduce){*,*::before,*::after{scroll-behavior:auto!important;animation:none!important;transition:none!important}}