:root{--purple:#6001d2;--purple-dark:#4b01a6;--purple-soft:#f2eaff;--bg:#f4f4f8;--panel:#fff;--border:#e2e2ea;--text:#1c1c24;--muted:#6b6b7c;--danger:#c62828;--unread-bg:#faf6ff;--shadow:0 6px 24px #140a3c29;--radius:8px}*{box-sizing:border-box}html,body,#root{height:100%;margin:0}body{color:var(--text);background:var(--bg);font-family:Segoe UI,Noto Sans TC,Microsoft JhengHei,system-ui,sans-serif;font-size:14px}button{font:inherit;color:inherit}input,select{font:inherit}.app{grid-template:"header header header"56px"sidebar list reading"minmax(0,1fr)/224px 384px minmax(0,1fr);height:100dvh;display:grid;overflow:hidden}.app-page{grid-template:"header"56px"page"minmax(0,1fr)/minmax(0,1fr)}.app-header{background:var(--purple);color:#fff;z-index:50;grid-area:header;align-items:center;gap:12px;padding:0 14px;display:flex}.header-brand{letter-spacing:.2px;align-items:center;gap:8px;font-weight:700;display:flex}.brand-mark{background:#ffffff29;border-radius:10px;justify-content:center;align-items:center;width:34px;height:34px;display:inline-flex}.brand-mark.small{border-radius:8px;width:28px;height:28px}.search-form{background:#ffffff29;border-radius:999px;flex:1;align-items:center;max-width:620px;height:36px;margin:0 auto;padding:0 10px;display:flex}.search-form:focus-within{color:var(--text);background:#fff}.search-form input{color:inherit;background:0 0;border:none;outline:none;flex:1;min-width:0;padding:0 8px}.search-form input::placeholder{color:#ffffffbf}.search-form:focus-within input::placeholder{color:var(--muted)}.search-icon{opacity:.9;display:inline-flex}.search-clear{cursor:pointer;opacity:.8;background:0 0;border:none;padding:0 4px;font-size:18px;line-height:1}.header-actions{align-items:center;gap:8px;display:flex}.btn-compose{color:var(--purple);cursor:pointer;background:#fff;border:none;border-radius:999px;align-items:center;gap:6px;padding:8px 16px;font-weight:600;display:inline-flex}.btn-compose:hover{background:var(--purple-soft)}.sidebar-toggle{color:#fff;display:none}.account-menu{position:relative}.account-menu summary{cursor:pointer;list-style:none}.account-menu summary::-webkit-details-marker{display:none}.menu-pop{min-width:220px;color:var(--text);border-radius:var(--radius);box-shadow:var(--shadow);background:#fff;flex-direction:column;padding:6px;display:flex;position:absolute;top:44px;right:0}.menu-identity{border-bottom:1px solid var(--border);flex-direction:column;margin-bottom:4px;padding:8px 10px;display:flex;overflow:hidden}.menu-identity span{color:var(--muted);font-size:12px}.menu-pop button{text-align:left;cursor:pointer;background:0 0;border:none;border-radius:6px;align-items:center;gap:8px;padding:9px 10px;display:flex}.menu-pop button:hover{background:var(--purple-soft)}.menu-pop button.danger{color:var(--danger)}.sidebar{background:var(--panel);border-right:1px solid var(--border);grid-area:sidebar;padding:12px 10px;overflow-y:auto}.sidebar-compose{background:var(--purple);color:#fff;justify-content:center;width:100%;margin-bottom:12px}.sidebar-compose:hover{background:var(--purple-dark)}.quota-line{background:var(--bg);color:var(--muted);text-align:center;border-radius:6px;margin:0 0 10px;padding:6px 10px;font-size:12.5px}.quota-line.exhausted{color:var(--danger);background:#fdeaea}.btn-compose:disabled,.menu-pop button:disabled{opacity:.55;cursor:not-allowed}.folder-list{margin:0 0 8px;padding:0;list-style:none}.folder-item{cursor:pointer;width:100%;color:var(--text);background:0 0;border:none;border-radius:6px;align-items:center;gap:10px;padding:9px 10px;display:flex}.folder-item:hover{background:#f2f2f7}.folder-item.active{background:var(--purple-soft);color:var(--purple-dark);font-weight:600}.folder-label{text-align:left;text-overflow:ellipsis;white-space:nowrap;flex:1;overflow:hidden}.badge{background:var(--purple);color:#fff;text-align:center;border-radius:999px;min-width:20px;padding:1px 7px;font-size:11px;font-weight:700}.count-muted{color:var(--muted);font-size:12px}.sidebar-section{color:var(--muted);text-transform:uppercase;letter-spacing:.06em;padding:12px 10px 6px;font-size:12px;font-weight:700}.sidebar-bottom{border-top:1px solid var(--border);margin-top:8px;padding-top:8px}.list-pane{background:var(--panel);border-right:1px solid var(--border);flex-direction:column;grid-area:list;min-width:0;display:flex}.list-head{border-bottom:1px solid var(--border);justify-content:space-between;align-items:center;padding:12px 14px 10px;display:flex}.list-head h2{text-overflow:ellipsis;white-space:nowrap;margin:0;font-size:15px;font-weight:700;overflow:hidden}.search-bar{background:var(--purple-soft);color:var(--purple-dark);justify-content:space-between;align-items:center;gap:8px;padding:6px 14px;font-size:12.5px;display:flex}.search-bar button{color:var(--purple-dark);cursor:pointer;background:0 0;border:none;font-size:12.5px;text-decoration:underline}.message-list{flex:1;overflow-y:auto}.message-list ul{margin:0;padding:0;list-style:none}.mail-row{text-align:left;border:none;border-bottom:1px solid var(--border);cursor:pointer;background:0 0;grid-template-columns:38px minmax(0,1fr) auto;align-items:start;gap:10px;width:100%;padding:10px 14px;display:grid}.mail-row:hover{background:#f7f5fb}.mail-row.unread{background:var(--unread-bg)}.mail-row.unread .mail-sender,.mail-row.unread .mail-subject{font-weight:700}.mail-row.selected{background:var(--purple-soft);box-shadow:inset 3px 0 0 var(--purple)}.mail-row-main{flex-direction:column;gap:2px;min-width:0;display:flex}.mail-row-top{justify-content:space-between;align-items:baseline;gap:8px;display:flex}.mail-sender{text-overflow:ellipsis;white-space:nowrap;font-weight:600;overflow:hidden}.mail-time{color:var(--muted);white-space:nowrap;font-size:12px}.mail-subject{text-overflow:ellipsis;white-space:nowrap;overflow:hidden}.mail-preview{color:var(--muted);text-overflow:ellipsis;white-space:nowrap;font-size:12.5px;overflow:hidden}.clip{vertical-align:middle;color:var(--muted);margin-left:6px;display:inline-flex}.folder-chip{color:var(--muted);white-space:nowrap;background:#eee;border-radius:999px;align-self:start;padding:2px 8px;font-size:11px}.list-sentinel{color:var(--muted);justify-content:center;min-height:32px;padding:12px;font-size:12.5px;display:flex}.list-end{opacity:.75}.list-state{color:var(--muted);text-align:center;flex-direction:column;flex:1;justify-content:center;align-items:center;gap:10px;padding:40px 20px;display:flex}.reading-pane{background:var(--panel);flex-direction:column;grid-area:reading;min-width:0;display:flex}.reading-pane.empty{justify-content:center;align-items:center}.empty-state{color:var(--muted);flex-direction:column;align-items:center;gap:12px;display:flex}.reading-toolbar{border-bottom:1px solid var(--border);align-items:center;gap:12px;padding:8px 12px;display:flex}.reading-toolbar .toolbar-group{gap:2px;display:flex}.reading-toolbar .toolbar-group:last-child{margin-left:auto}.reading-toolbar .back-btn{display:none}.reading-scroll{flex-direction:column;flex:1;min-height:0;padding:18px 22px;display:flex;overflow-y:auto}.reading-head{margin-bottom:14px}.reading-subject{word-break:break-word;margin:0 0 12px;font-size:20px;line-height:1.35}.reading-sender{align-items:center;gap:12px;display:flex}.sender-lines{min-width:0}.sender-name{font-weight:700}.sender-meta{color:var(--muted);font-size:12.5px}.recipients{color:var(--muted);margin-top:2px;font-size:12.5px}.recipients summary{cursor:pointer}.recipients-detail{background:var(--bg);word-break:break-all;border-radius:6px;flex-direction:column;gap:3px;margin-top:6px;padding:8px 10px;display:flex}.attachment-strip{flex-wrap:wrap;gap:8px;margin-bottom:12px;display:flex}.attachment-chip{border:1px solid var(--border);background:var(--bg);cursor:pointer;border-radius:999px;align-items:center;gap:8px;max-width:320px;padding:6px 12px;display:inline-flex}.attachment-chip:hover{border-color:var(--purple);background:var(--purple-soft)}.att-name{text-overflow:ellipsis;white-space:nowrap;max-width:200px;overflow:hidden}.att-size{color:var(--muted);white-space:nowrap;font-size:12px}.reading-body{flex-direction:column;flex:1;min-height:320px;display:flex}.html-body{border:1px solid var(--border);background:#fff;border-radius:6px;flex:1;width:100%;min-height:320px}.plain-body{border:1px solid var(--border);white-space:pre-wrap;word-break:break-word;background:#fff;border-radius:6px;flex:1;margin:0;padding:16px;font-family:inherit}.compose-window{background:var(--panel);width:560px;max-width:calc(100vw - 32px);height:580px;max-height:calc(100dvh - 80px);box-shadow:var(--shadow);z-index:70;border-radius:10px 10px 0 0;flex-direction:column;display:flex;position:fixed;bottom:0;right:22px;overflow:hidden}.compose-head{background:var(--purple);color:#fff;justify-content:space-between;align-items:center;padding:8px 10px 8px 14px;display:flex}.compose-head .icon-btn{color:#fff}.compose-form{flex-direction:column;flex:1;gap:6px;min-height:0;padding:8px 12px 10px;display:flex}.compose-row{border-bottom:1px solid var(--border);align-items:center;gap:8px;padding:2px 0;display:flex}.compose-row label{width:72px;color:var(--muted);flex-shrink:0;font-size:13px}.compose-row input,.compose-row select{background:0 0;border:none;outline:none;flex:1;min-width:0;padding:7px 2px}.compose-cc-toggle{gap:8px;display:flex}.compose-cc-toggle button{color:var(--purple);cursor:pointer;background:0 0;border:none;font-size:12.5px}.compose-toolbar{align-items:center;gap:2px;padding:2px 0;display:flex}.compose-toolbar button{cursor:pointer;background:0 0;border:none;border-radius:6px;width:30px;height:28px}.compose-toolbar button:hover{background:var(--bg)}.toolbar-spacer{flex:1}.compose-editor{border:1px solid var(--border);border-radius:6px;outline:none;flex:1;min-height:140px;padding:10px 12px;line-height:1.55;overflow-y:auto}.compose-editor:focus{border-color:var(--purple)}.compose-attachments{flex-direction:column;gap:4px;max-height:96px;margin:0;padding:0;list-style:none;display:flex;overflow-y:auto}.compose-attachments li{background:var(--bg);border-radius:6px;align-items:center;gap:8px;padding:5px 8px;display:flex}.compose-error,.login-error{color:var(--danger);margin:0;font-size:13px}.compose-footer{align-items:center;gap:10px;display:flex}.compose-hint{color:var(--muted);font-size:12px}.btn-primary{background:var(--purple);color:#fff;cursor:pointer;border:none;border-radius:999px;align-items:center;gap:6px;padding:9px 22px;font-weight:600;display:inline-flex}.btn-primary:hover:not(:disabled){background:var(--purple-dark)}.btn-primary:disabled{opacity:.6;cursor:default}.btn-secondary{border:1px solid var(--border);cursor:pointer;background:#fff;border-radius:999px;padding:8px 14px}.btn-secondary:hover{border-color:var(--purple);color:var(--purple)}.btn-danger{background:var(--danger);color:#fff;cursor:pointer;border:none;border-radius:999px;padding:9px 20px}.icon-btn{cursor:pointer;width:34px;height:34px;color:inherit;background:0 0;border:none;border-radius:999px;justify-content:center;align-items:center;display:inline-flex}.icon-btn:hover{background:#0000000f}.app-header .icon-btn:hover{background:#ffffff2e}.icon-btn.danger{color:var(--danger)}.avatar{color:#fff;background:#8b5cf6;border-radius:50%;flex-shrink:0;justify-content:center;align-items:center;width:34px;height:34px;font-weight:700;display:inline-flex}.avatar-owner{background:#f59e0b}.spinner{border:3px solid var(--border);border-top-color:var(--purple);border-radius:50%;width:26px;height:26px;animation:.8s linear infinite spin}.spinner.small{border-width:2px;width:14px;height:14px}@keyframes 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input{border:1px solid var(--border);border-radius:6px;padding:9px 10px}.modal-actions{justify-content:flex-end;gap:8px;margin-top:4px;display:flex}.login-page{background:linear-gradient(160deg, var(--purple) 0%, #2c0a63 100%);justify-content:center;align-items:center;min-height:100dvh;padding:20px;display:flex}.login-card{width:min(420px,100%);box-shadow:var(--shadow);background:#fff;border-radius:14px;padding:28px 26px}.login-brand{align-items:center;gap:12px;margin-bottom:20px;display:flex}.login-brand .brand-mark{background:var(--purple);color:#fff;border-radius:12px;width:44px;height:44px}.login-brand h1{margin:0;font-size:20px}.login-brand p{color:var(--muted);margin:2px 0 0;font-size:13px}.login-tabs{background:var(--bg);border-radius:999px;margin-bottom:18px;padding:4px;display:flex}.login-tabs button{cursor:pointer;color:var(--muted);background:0 0;border:none;border-radius:999px;flex:1;padding:9px 0;font-weight:600}.login-tabs button.active{color:var(--purple);background:#fff;box-shadow:0 1px 4px #0000001f}.login-form{flex-direction:column;gap:14px;display:flex}.login-form label{color:var(--muted);flex-direction:column;gap:6px;font-size:13px;display:flex}.login-form input{border:1px solid var(--border);border-radius:8px;outline:none;padding:11px 12px}.login-form input:focus{border-color:var(--purple);box-shadow:0 0 0 3px var(--purple-soft)}.login-form .suffix-input{width:100%}.login-form .suffix-input input{width:auto;box-shadow:none;border:none;border-radius:0;flex:1}.login-form .btn-primary{justify-content:center;padding:12px}.login-notice{color:#7a5a00;background:#fff7e0;border:1px solid #f0d9a0;border-radius:8px;margin-bottom:14px;padding:10px 12px;font-size:13px}.login-hint{color:var(--muted);margin:14px 0 0;font-size:12.5px;line-height:1.5}.address-page{background:var(--bg);grid-area:page;padding:22px 26px 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button.danger:hover{border-color:var(--danger);color:var(--danger)}@media (width<=1180px){.app{grid-template-columns:200px 330px minmax(0,1fr)}}@media (width<=960px){.app{grid-template-columns:minmax(0,1fr);grid-template-areas:"header""list"}.sidebar{z-index:45;width:264px;box-shadow:var(--shadow);transition:transform .18s ease-out;position:fixed;top:56px;bottom:0;left:0;transform:translate(-102%)}.sidebar.open{transform:none}.sidebar-toggle{display:inline-flex}.list-pane{border-right:none}.reading-pane{z-index:40;position:fixed;inset:56px 0 0}.reading-pane.empty{display:none}.reading-toolbar .back-btn{display:inline-flex}.compose-window{border-radius:0;width:auto;max-width:none;height:calc(100dvh - 56px);max-height:none;left:0;right:0}.list-head h2{max-width:60vw}}