:root{--bg:#f3f5f8;--panel:#fff;--line:#e3e7ee;--text:#1d2733;--muted:#6b7a8c;--brand:#2b64c8;--brand-dark:#1f4c9b;--accent:#ff9f1c;--danger:#d64545;--hover:#eef3fb;--selected:#dfe9fb;--unread:#111;--shadow:0 8px 30px rgba(20,35,60,.12)}
*{box-sizing:border-box}html,body{height:100%}body{margin:0;background:var(--bg);color:var(--text);font:14px/1.55 -apple-system,BlinkMacSystemFont,"Segoe UI","Apple SD Gothic Neo","Noto Sans KR",system-ui,sans-serif}
button,input,select,textarea{font:inherit;color:inherit}button{cursor:pointer;border:1px solid var(--line);border-radius:8px;background:#fff;padding:7px 12px;min-height:36px}button:disabled{opacity:.5;cursor:wait}
button.primary{background:var(--brand);color:#fff;border-color:var(--brand)}button.primary:hover{background:var(--brand-dark)}button.danger{background:var(--danger);color:#fff;border-color:var(--danger)}button.ghost{background:transparent;border-color:transparent}button.ghost:hover{background:var(--hover)}
.icon-btn{border:0;background:transparent;font-size:18px;padding:6px 10px;border-radius:8px}.icon-btn:hover{background:var(--hover)}
input,select,textarea{width:100%;padding:8px 10px;border:1px solid #cbd3de;border-radius:8px;background:#fff;min-height:36px}input:focus,select:focus,textarea:focus,[contenteditable]:focus{outline:2px solid #9dbcf3;outline-offset:1px}
label{display:block;margin-bottom:12px}label>span{display:block;font-size:12px;color:var(--muted);margin-bottom:4px}.muted{color:var(--muted)}.meta{font-size:12px;color:var(--muted)}
[hidden]{display:none!important}
/* 로그인 */
#login{min-height:100%;display:flex;align-items:center;justify-content:center;padding:24px;background:linear-gradient(135deg,#1f4c9b,#2b64c8 60%,#4c8ae6)}
.login-card{background:#fff;border-radius:16px;padding:32px 28px;width:min(400px,100%);box-shadow:var(--shadow)}.login-brand{display:flex;align-items:center;gap:10px;margin-bottom:6px}.login-brand h1{font-size:20px;margin:0}.logo{display:inline-flex;width:34px;height:34px;border-radius:9px;background:var(--brand);color:#fff;align-items:center;justify-content:center;font-size:18px}
#login button{width:100%;min-height:42px;margin-top:6px}#login-feedback:not(:empty){margin:12px 0 0;padding:10px;border-radius:8px;background:#fdecec;color:#8d2323}
/* 상단 */
#workspace{height:100vh;display:flex;flex-direction:column}
.topbar{display:flex;align-items:center;gap:14px;padding:0 16px;height:54px;background:#fff;border-bottom:1px solid var(--line);flex-shrink:0}.brand{display:flex;align-items:center;gap:8px;font-weight:700;white-space:nowrap}.search{flex:1;max-width:620px;display:flex;align-items:center;background:var(--bg);border-radius:10px;padding:0 4px 0 12px}.search input{border:0;background:transparent;min-height:38px}.search input:focus{outline:none}.topbar-right{margin-left:auto;display:flex;align-items:center;gap:10px}.who{font-size:13px;color:var(--muted);white-space:nowrap}#mailbox-select{width:auto;min-height:32px;padding:4px 8px;font-size:13px}
#menu-toggle{display:none}
/* 3단 */
.shell{flex:1;display:flex;min-height:0}
.sidebar{width:230px;flex-shrink:0;background:#fff;border-right:1px solid var(--line);padding:14px 12px;display:flex;flex-direction:column;gap:6px;overflow:auto}
.compose-btn{background:var(--brand);color:#fff;border:0;border-radius:10px;min-height:42px;font-weight:600;margin-bottom:10px;box-shadow:0 4px 12px rgba(43,100,200,.35)}.compose-btn:hover{background:var(--brand-dark)}
.folders{display:flex;flex-direction:column;gap:2px}.folders button{display:flex;align-items:center;gap:10px;border:0;background:transparent;text-align:left;border-radius:8px;padding:8px 10px;min-height:38px}.folders button:hover{background:var(--hover)}.folders button[aria-current=true]{background:var(--selected);font-weight:600;color:var(--brand-dark)}.folders .badge{margin-left:auto;background:var(--brand);color:#fff;border-radius:999px;font-size:11px;padding:1px 8px;font-weight:600}.folders button[aria-current=true] .badge{background:var(--brand-dark)}.folders.small button{min-height:34px;font-size:13px}.folders .ic{width:20px;text-align:center;opacity:.8}
.side-title{font-size:11px;text-transform:uppercase;letter-spacing:.06em;color:var(--muted);margin:14px 6px 4px}.usage{margin-top:auto;padding:12px 8px 4px;font-size:12px;color:var(--muted);border-top:1px solid var(--line)}.usage .bar{height:6px;background:var(--bg);border-radius:4px;overflow:hidden;margin:6px 0}.usage .bar i{display:block;height:100%;background:var(--brand)}
.main{flex:1;display:flex;min-width:0;position:relative}
#feedback{position:absolute;top:10px;left:50%;transform:translateX(-50%);z-index:20;background:#1d2733;color:#fff;padding:10px 16px;border-radius:10px;box-shadow:var(--shadow);max-width:90%;font-size:13px}#feedback:empty{display:none}
.list-pane{width:400px;flex-shrink:0;border-right:1px solid var(--line);background:#fff;display:flex;flex-direction:column;min-height:0}
.read-pane{flex:1;min-width:0;background:#fff;display:flex;flex-direction:column;min-height:0}
.page-pane{flex:1;overflow:auto;padding:24px;background:var(--bg)}
.list-toolbar{display:flex;align-items:center;gap:6px;padding:8px 10px;border-bottom:1px solid var(--line);flex-wrap:wrap}.list-toolbar .spacer{flex:1}.list-toolbar button{min-height:32px;padding:4px 9px;font-size:13px}.list-toolbar select{width:auto;min-height:32px;padding:3px 6px;font-size:13px}
.list-head{display:flex;align-items:center;gap:8px;padding:6px 12px;font-size:12px;color:var(--muted);border-bottom:1px solid var(--line)}
.mail-list{flex:1;overflow:auto}
.mail-row{display:grid;grid-template-columns:auto auto minmax(0,1fr) auto;gap:6px 10px;padding:10px 12px;border-bottom:1px solid #eef1f5;cursor:pointer;align-items:start;position:relative}.mail-row:hover{background:var(--hover)}.mail-row[aria-selected=true]{background:var(--selected)}.mail-row.unread .subject,.mail-row.unread .who{font-weight:700;color:var(--unread)}
.mail-row input[type=checkbox]{width:16px;height:16px;margin-top:3px}.mail-row .star{background:transparent;border:0;padding:0;min-height:0;font-size:16px;color:#c2c9d3;line-height:1}.mail-row .star.on{color:var(--accent)}
.mail-row .who{overflow:hidden;text-overflow:ellipsis;white-space:nowrap;font-size:13px}.mail-row .subject{overflow:hidden;text-overflow:ellipsis;white-space:nowrap;grid-column:3;font-size:14px}.mail-row .snippet{grid-column:3;color:var(--muted);font-size:12px;overflow:hidden;text-overflow:ellipsis;white-space:nowrap}.mail-row time{font-size:12px;color:var(--muted);white-space:nowrap}.mail-row .icons{grid-column:4;font-size:12px;color:var(--muted);text-align:right}
.mail-row .avatar{grid-row:1/4;grid-column:2;width:34px;height:34px;border-radius:50%;display:flex;align-items:center;justify-content:center;font-weight:700;color:#fff;font-size:14px}
.pager{display:flex;align-items:center;justify-content:center;gap:10px;padding:8px;border-top:1px solid var(--line);font-size:12px;color:var(--muted)}.pager button{min-height:30px;padding:3px 10px}
.empty{padding:40px 20px;text-align:center;color:var(--muted)}.empty .big{font-size:40px;opacity:.4}
/* 읽기 */
.read-head{padding:16px 22px 10px;border-bottom:1px solid var(--line)}.read-head h2{margin:0 0 10px;font-size:20px;font-weight:600;overflow-wrap:anywhere}.read-actions{display:flex;gap:6px;flex-wrap:wrap;margin-bottom:12px}.read-actions button{min-height:32px;padding:4px 10px;font-size:13px}
.sender-line{display:flex;gap:12px;align-items:center}.sender-line .avatar{width:40px;height:40px;border-radius:50%;display:flex;align-items:center;justify-content:center;color:#fff;font-weight:700;flex-shrink:0}.sender-line .lines{min-width:0}.sender-line .name{font-weight:600}.sender-line .addr{color:var(--muted);font-size:12px;overflow-wrap:anywhere}.sender-line time{margin-left:auto;font-size:12px;color:var(--muted);white-space:nowrap}
.detail-box{margin-top:10px;font-size:12px;color:var(--muted);display:grid;grid-template-columns:70px 1fr;gap:2px 8px}
.read-body{flex:1;overflow:auto;padding:10px 22px 22px}.mail-frame{width:100%;border:0;min-height:300px;background:#fff}
.attach-list{display:flex;flex-wrap:wrap;gap:8px;padding:10px 22px;border-top:1px solid var(--line)}.chip{display:inline-flex;align-items:center;gap:6px;border:1px solid var(--line);border-radius:8px;padding:6px 10px;font-size:13px;background:#fafbfd;text-decoration:none;color:inherit;max-width:100%}.chip:hover{background:var(--hover)}.chip .sz{color:var(--muted);font-size:11px}
.tag{display:inline-block;padding:1px 8px;border-radius:999px;font-size:11px;background:#e8edf3;color:#3a4a60;margin-left:4px}.tag.ok{background:#e3f3e6;color:#1d6b33}.tag.warn{background:#fde8e6;color:#9b2c1f}.tag.accent{background:#fff1dc;color:#9a5b00}
.notice{padding:8px 12px;background:#fff8e6;border:1px solid #ffe2a8;border-radius:8px;font-size:12px;margin:8px 22px 0;display:flex;gap:10px;align-items:center}
/* 작성 */
#compose{width:min(980px,96vw);max-height:94vh;border:0;border-radius:14px;padding:0;box-shadow:var(--shadow)}#compose::backdrop{background:#14233566}
.compose-head{display:flex;align-items:center;gap:10px;padding:12px 18px;background:#1f4c9b;color:#fff;border-radius:14px 14px 0 0}.compose-head h2{margin:0;font-size:16px;font-weight:600;flex:1}.compose-head button{color:#fff;border:0;background:transparent;font-size:18px;padding:2px 8px;min-height:0}
.compose-form{padding:14px 18px 16px;display:flex;flex-direction:column;gap:8px;max-height:calc(94vh - 52px);overflow:auto}
.addr-row{display:grid;grid-template-columns:90px 1fr auto;align-items:center;gap:8px;border-bottom:1px solid var(--line);padding:4px 0}.addr-row span{font-size:13px;color:var(--muted)}.addr-row input{border:0;min-height:32px;padding:4px 6px}.addr-row input:focus{outline:none}.addr-row .link{color:var(--brand);font-size:12px;cursor:pointer;background:transparent;border:0;min-height:0;padding:2px 6px}
.editor-tools{display:flex;gap:2px;flex-wrap:wrap;padding:6px;background:var(--bg);border-radius:8px;align-items:center}.editor-tools button{border:0;background:transparent;min-height:30px;padding:3px 7px;border-radius:6px;font-size:14px}.editor-tools button:hover{background:#fff}.editor-tools button[aria-pressed=true]{background:#fff;box-shadow:inset 0 0 0 1px var(--line)}.editor-tools select{width:auto;min-height:30px;padding:2px 4px;font-size:12px;border-color:transparent;background:transparent}.editor-tools .sep{width:1px;height:20px;background:#d5dbe4;margin:0 4px}.editor-tools input[type=color]{width:26px;height:26px;padding:0;border:0;background:transparent;min-height:0}.editor-tools label{margin:0;display:inline-flex;align-items:center;gap:3px;font-size:12px;color:var(--muted)}
.html-editor{border:1px solid var(--line);border-radius:8px;background:#fff;min-height:320px;padding:16px;overflow-wrap:anywhere;line-height:1.6}.html-editor img{max-width:100%;height:auto}.html-editor blockquote{border-left:3px solid #c8d2e0;margin:8px 0;padding-left:12px;color:#4a5566}.html-source{min-height:320px;font-family:ui-monospace,SFMono-Regular,Menlo,monospace;font-size:13px}
.compose-attachments{display:flex;flex-wrap:wrap;gap:6px}.compose-attachments .chip button{border:0;background:transparent;padding:0 2px;min-height:0;color:var(--muted)}
.compose-foot{display:flex;gap:8px;align-items:center;flex-wrap:wrap;padding-top:6px;border-top:1px solid var(--line)}.compose-foot .spacer{flex:1}.compose-foot .status{font-size:12px;color:var(--muted)}
/* 페이지(설정·계정) */
.card{background:#fff;border:1px solid var(--line);border-radius:12px;padding:20px;margin-bottom:16px;max-width:1100px}h1.page-title{font-size:22px;margin:0 0 6px}h2{font-size:17px;margin:0 0 10px}h3{font-size:15px;margin:16px 0 8px}
dl.kv{display:grid;grid-template-columns:minmax(160px,260px) 1fr;gap:6px 16px;margin:0}dl.kv dt{font-weight:600;color:#3a4a60}dl.kv dd{margin:0;overflow-wrap:anywhere}code{background:#eef1f4;padding:2px 6px;border-radius:4px;font-size:13px}ol.steps li{margin-bottom:6px}
table.simple{border-collapse:collapse;width:100%}table.simple th,table.simple td{text-align:left;padding:8px 10px;border-bottom:1px solid #e8eaef;font-size:13px}table.simple th{color:var(--muted);font-weight:600}table.simple tr[data-row]{cursor:pointer}table.simple tr[data-row]:hover{background:var(--hover)}
.actions{display:flex;gap:8px;margin-top:16px;flex-wrap:wrap}.grid2{display:grid;grid-template-columns:1fr 1fr;gap:0 16px}
#detail{width:min(640px,94vw);border:0;border-radius:14px;padding:22px;box-shadow:var(--shadow)}#detail::backdrop{background:#14233566}#detail .close{float:right}#dialog-feedback:not(:empty){background:#fdecec;color:#8d2323;padding:10px;border-radius:8px;margin-bottom:10px}
.avatar.c0{background:#2b64c8}.avatar.c1{background:#1d9a6c}.avatar.c2{background:#d64545}.avatar.c3{background:#9a5b00}.avatar.c4{background:#6b4bc8}.avatar.c5{background:#0e8ba8}
@media(max-width:1100px){.list-pane{width:340px}}
@media(max-width:900px){#menu-toggle{display:inline-block}.sidebar{position:absolute;left:0;top:54px;bottom:0;z-index:30;transform:translateX(-100%);transition:transform .2s;box-shadow:var(--shadow)}.sidebar.open{transform:none}.shell{position:relative}.list-pane{width:100%;border-right:0}.read-pane{position:absolute;inset:0;z-index:10;display:none}.read-pane.open{display:flex}.search{max-width:none}.who{display:none}}
@media(max-width:600px){.topbar{padding:0 8px;gap:8px}.brand span:last-child{display:none}.mail-row .avatar{display:none}.read-head{padding:12px 14px 8px}.read-body{padding:8px 14px 14px}.attach-list{padding:8px 14px}.page-pane{padding:12px}.grid2{grid-template-columns:1fr}.addr-row{grid-template-columns:70px 1fr auto}#compose{width:100vw;max-height:100vh;border-radius:0}.compose-head{border-radius:0}}