*,*::before,*::after{box-sizing:border-box;margin:0;padding:0}
html,body{height:100%;font-family:-apple-system,BlinkMacSystemFont,'Segoe UI','PingFang SC','Microsoft YaHei',sans-serif;font-size:14px;background:#f0f2f5;color:#1a1a2e}
.app{display:flex;height:100vh;overflow:hidden}

/* Sidebar */
.sidebar{width:220px;min-width:220px;background:linear-gradient(180deg,#1a1a2e 0%,#16213e 60%,#0f3460 100%);display:flex;flex-direction:column;box-shadow:2px 0 12px rgba(0,0,0,.18);z-index:10;transition:width .25s}
.sidebar-logo{display:flex;align-items:center;gap:10px;padding:22px 20px 18px;border-bottom:1px solid rgba(255,255,255,.08)}
.sidebar-logo .logo-icon{width:36px;height:36px;border-radius:10px;background:linear-gradient(135deg,#e94560,#f5a623);display:flex;align-items:center;justify-content:center;font-size:20px;color:#fff;flex-shrink:0}
.sidebar-logo span{color:#fff;font-size:17px;font-weight:700;letter-spacing:1px}
.compose-btn{margin:16px 16px 8px;padding:10px 0;background:linear-gradient(90deg,#e94560,#f5a623);border:none;border-radius:24px;color:#fff;font-size:14px;font-weight:600;cursor:pointer;display:flex;align-items:center;justify-content:center;gap:7px;box-shadow:0 4px 15px rgba(233,69,96,.35);transition:all .2s}
.compose-btn:hover{transform:translateY(-1px);box-shadow:0 6px 20px rgba(233,69,96,.45)}
.sidebar-nav{flex:1;padding:8px 0;overflow-y:auto}
.nav-section-title{padding:14px 20px 5px;font-size:11px;font-weight:600;letter-spacing:1.2px;color:rgba(255,255,255,.35);text-transform:uppercase}
.nav-item{display:flex;align-items:center;gap:12px;padding:9px 20px;cursor:pointer;color:rgba(255,255,255,.7);transition:all .18s;position:relative}
.nav-item:hover{background:rgba(255,255,255,.08);color:#fff}
.nav-item.active{background:rgba(233,69,96,.15);color:#e94560;border-right:3px solid #e94560}
.nav-item .icon{font-size:16px;width:20px;text-align:center;flex-shrink:0}
.nav-item .label{flex:1;font-size:13.5px}
.nav-item .badge{background:#e94560;color:#fff;font-size:11px;font-weight:700;padding:1px 7px;border-radius:10px;min-width:20px;text-align:center}
.sidebar-footer{padding:16px;border-top:1px solid rgba(255,255,255,.08)}
.storage-bar-label{display:flex;justify-content:space-between;color:rgba(255,255,255,.45);font-size:11px;margin-bottom:4px}
.storage-track{height:4px;background:rgba(255,255,255,.12);border-radius:2px;overflow:hidden}
.storage-fill{height:100%;background:linear-gradient(90deg,#e94560,#f5a623);border-radius:2px;width:62%}
.user-profile{display:flex;align-items:center;gap:10px;padding:12px 0 0;cursor:pointer}
.avatar{width:34px;height:34px;border-radius:50%;background:linear-gradient(135deg,#e94560,#f5a623);display:flex;align-items:center;justify-content:center;color:#fff;font-size:13px;font-weight:700;flex-shrink:0}
.user-name{color:#fff;font-size:13px;font-weight:600;white-space:nowrap;overflow:hidden;text-overflow:ellipsis}
.user-email{color:rgba(255,255,255,.4);font-size:11px;white-space:nowrap;overflow:hidden;text-overflow:ellipsis}

/* Theme toggle in sidebar footer */
.theme-toggle-row{display:flex;align-items:center;justify-content:space-between;padding:8px 0 0}
.theme-toggle-label{font-size:11px;color:rgba(255,255,255,.4);letter-spacing:.3px}
.theme-toggle-btn{width:42px;height:22px;border-radius:11px;background:rgba(255,255,255,.15);border:none;cursor:pointer;position:relative;transition:background .25s;flex-shrink:0}
.theme-toggle-btn.on{background:linear-gradient(90deg,#e94560,#f5a623)}
.theme-toggle-btn::after{content:'';position:absolute;top:3px;left:3px;width:16px;height:16px;border-radius:50%;background:#fff;transition:transform .25s;box-shadow:0 1px 4px rgba(0,0,0,.25)}
.theme-toggle-btn.on::after{transform:translateX(20px)}

/* Mail List Panel */
.mail-list-panel{width:320px;min-width:280px;background:#fff;display:flex;flex-direction:column;border-right:1px solid #e8eaf0}
.panel-header{padding:18px 16px 12px;border-bottom:1px solid #f0f0f5}
.panel-title{font-size:18px;font-weight:700;color:#1a1a2e;margin-bottom:12px;display:flex;align-items:center;gap:8px}
.panel-title .count-badge{font-size:12px;font-weight:600;background:#f0f2f5;color:#666;padding:2px 8px;border-radius:10px}
.search-box{position:relative;margin-bottom:12px}
.search-icon{position:absolute;left:12px;top:50%;transform:translateY(-50%);color:#bbb;font-size:14px;pointer-events:none}
.search-box input{width:100%;padding:9px 12px 9px 34px;border:1.5px solid #eee;border-radius:10px;font-size:13px;color:#333;outline:none;transition:border-color .18s;font-family:inherit}
.search-box input:focus{border-color:#e94560}
.filter-tabs{display:flex;gap:6px}
.filter-tab{padding:5px 14px;border-radius:20px;font-size:12px;font-weight:600;cursor:pointer;color:#888;background:#f5f5f7;transition:all .18s}
.filter-tab.active,.filter-tab:hover{background:linear-gradient(90deg,#e94560,#f5a623);color:#fff}

/* Tag filter chips */
.tag-filter-row{display:flex;gap:6px;padding:10px 16px;border-bottom:1px solid #f0f0f5;overflow-x:auto;scrollbar-width:none}
.tag-filter-row::-webkit-scrollbar{display:none}
.tag-chip{padding:4px 12px;border-radius:20px;font-size:11px;font-weight:600;cursor:pointer;border:1.5px solid #e8eaf0;color:#888;background:#fff;white-space:nowrap;transition:all .18s;flex-shrink:0}
.tag-chip:hover{border-color:#e94560;color:#e94560}
.tag-chip.active{background:linear-gradient(90deg,#e94560,#f5a623);color:#fff;border-color:transparent;box-shadow:0 2px 8px rgba(233,69,96,.25)}

/* Mail list */
.mail-list{flex:1;overflow-y:auto}
.mail-item{padding:14px 16px;border-bottom:1px solid #f5f5f8;cursor:pointer;position:relative;transition:background .15s}
.mail-item:hover{background:#fafbff}
.mail-item.active{background:#fff5f7;border-left:3px solid #e94560}
.mail-item.unread{background:#fffbfc}
.mail-item-top{display:flex;align-items:center;gap:10px;margin-bottom:5px}
.item-avatar{width:36px;height:36px;border-radius:50%;display:flex;align-items:center;justify-content:center;color:#fff;font-size:14px;font-weight:700;flex-shrink:0}
.item-meta{flex:1;min-width:0}
.sender-name{font-size:13.5px;font-weight:600;color:#1a1a2e;white-space:nowrap;overflow:hidden;text-overflow:ellipsis}
.mail-time{font-size:11px;color:#bbb;white-space:nowrap;flex-shrink:0}
.mail-subject{font-size:13px;font-weight:500;color:#333;margin-bottom:3px;white-space:nowrap;overflow:hidden;text-overflow:ellipsis}
.mail-item.unread .mail-subject{font-weight:700;color:#1a1a2e}
.mail-preview{font-size:12px;color:#aaa;white-space:nowrap;overflow:hidden;text-overflow:ellipsis}
.mail-tags{display:flex;gap:4px;margin-top:5px;flex-wrap:wrap}
.tag{padding:2px 8px;border-radius:10px;font-size:11px;font-weight:600}
.tag-work{background:#e3f2fd;color:#1976d2}
.tag-urgent{background:#fce4ec;color:#c62828}
.tag-personal{background:#f3e5f5;color:#7b1fa2}
.tag-finance{background:#e8f5e9;color:#2e7d32}
.unread-dot{position:absolute;top:16px;right:16px;width:8px;height:8px;border-radius:50%;background:#e94560}

/* Skeleton loader */
.skeleton-item{padding:14px 16px;border-bottom:1px solid #f5f5f8}
.skeleton-line{border-radius:6px;background:linear-gradient(90deg,#f0f0f0 25%,#e0e0e0 50%,#f0f0f0 75%);background-size:200% 100%;animation:shimmer 1.4s infinite}
@keyframes shimmer{0%{background-position:200% 0}100%{background-position:-200% 0}}
.sk-avatar{width:36px;height:36px;border-radius:50%;background:linear-gradient(90deg,#f0f0f0 25%,#e0e0e0 50%,#f0f0f0 75%);background-size:200% 100%;animation:shimmer 1.4s infinite;flex-shrink:0}
.sk-row{display:flex;align-items:center;gap:10px;margin-bottom:8px}
.sk-title{height:13px;width:55%;margin-bottom:0}
.sk-time{height:11px;width:15%;margin-left:auto}
.sk-subject{height:12px;width:80%;margin-bottom:6px}
.sk-preview{height:11px;width:65%}

/* Detail panel */
.detail-panel{flex:1;background:#f7f8fc;overflow-y:auto;display:flex;flex-direction:column}
.detail-empty{flex:1;display:flex;flex-direction:column;align-items:center;justify-content:center;color:#ccc;gap:14px}
.empty-icon{font-size:56px;opacity:.4}
.detail-header{padding:24px 32px 16px;background:#fff;border-bottom:1px solid #eee}
.detail-subject{font-size:20px;font-weight:700;color:#1a1a2e;margin-bottom:16px;line-height:1.4}
.detail-meta{display:flex;align-items:center;gap:14px}
.meta-avatar{width:42px;height:42px;border-radius:50%;display:flex;align-items:center;justify-content:center;color:#fff;font-size:16px;font-weight:700;flex-shrink:0}
.meta-info{flex:1}
.meta-sender{font-size:15px;font-weight:700;color:#1a1a2e;margin-bottom:2px}
.meta-addr{font-size:12px;color:#888;line-height:1.7}
.meta-date{font-size:12px;color:#aaa;white-space:nowrap}
.detail-actions{display:flex;gap:8px;padding:12px 32px;background:#fff;border-bottom:1px solid #f0f0f5}
.action-btn{display:flex;align-items:center;gap:5px;padding:7px 16px;border:1.5px solid #e8eaf0;border-radius:20px;background:#fff;font-size:13px;color:#555;cursor:pointer;transition:all .18s;font-family:inherit}
.action-btn:hover{border-color:#e94560;color:#e94560;background:#fff5f7}
.action-btn.danger:hover{border-color:#e53935;color:#e53935;background:#fff5f5}
.action-btn.star-active{color:#f5a623;border-color:#f5a623}
.detail-body{padding:24px 32px;flex:1}
.mail-detail-content{font-size:14.5px;line-height:1.9;color:#333;padding-bottom:24px}
.mail-detail-content p{margin-bottom:12px}
.mail-detail-content code{background:#f0f2f5;padding:2px 6px;border-radius:4px;font-family:monospace;font-size:13px;color:#e94560}
.attachments{padding:16px;background:#fff;border-radius:10px;margin-bottom:24px;box-shadow:0 1px 4px rgba(0,0,0,.06)}
.att-title{font-size:13px;font-weight:600;color:#555;margin-bottom:10px}
.att-list{display:flex;gap:10px;flex-wrap:wrap}
.att-item{display:flex;align-items:center;gap:10px;padding:10px 14px;border:1.5px solid #e8eaf0;border-radius:8px;cursor:pointer;transition:all .18s;background:#fafbff}
.att-item:hover{border-color:#e94560;background:#fff5f7}
.att-icon{font-size:24px}
.att-name{font-size:13px;font-weight:600;color:#333}
.att-size{font-size:11px;color:#aaa}

/* Reply Box */
.reply-box{margin:0 32px 24px;background:#fff;border-radius:12px;box-shadow:0 2px 8px rgba(0,0,0,.07);overflow:hidden}
.reply-header{padding:12px 16px;background:#f7f8fc;border-bottom:1px solid #eee;font-size:13px;font-weight:600;color:#555}
.reply-box textarea{width:100%;padding:14px 16px;border:none;outline:none;font-size:14px;color:#333;resize:none;min-height:100px;font-family:inherit}
.reply-actions{display:flex;align-items:center;justify-content:space-between;padding:10px 16px;border-top:1px solid #f0f0f5}
.reply-tools{display:flex;gap:6px}
.reply-tool{width:32px;height:32px;border:1.5px solid #e8eaf0;border-radius:6px;background:#fff;cursor:pointer;font-size:16px;display:flex;align-items:center;justify-content:center;transition:all .18s}
.reply-tool:hover{border-color:#e94560;background:#fff5f7}
.send-btn{padding:8px 22px;background:linear-gradient(90deg,#e94560,#f5a623);border:none;border-radius:20px;color:#fff;font-size:13px;font-weight:600;cursor:pointer;transition:all .2s;box-shadow:0 3px 10px rgba(233,69,96,.3)}
.send-btn:hover{transform:translateY(-1px);box-shadow:0 5px 15px rgba(233,69,96,.4)}

/* Compose Modal */
.modal-overlay{position:fixed;inset:0;background:rgba(0,0,0,.4);z-index:1000;display:none;align-items:flex-end;justify-content:flex-end;padding:0 24px 24px}
.modal-overlay.show{display:flex}
.compose-modal{width:520px;background:#fff;border-radius:14px 14px 6px 6px;box-shadow:0 8px 40px rgba(0,0,0,.2);overflow:hidden;display:flex;flex-direction:column;max-height:80vh}
.compose-header{display:flex;align-items:center;padding:14px 18px;background:linear-gradient(90deg,#1a1a2e,#0f3460);color:#fff}
.compose-header span{flex:1;font-size:15px;font-weight:600}
.compose-close{background:none;border:none;color:rgba(255,255,255,.7);font-size:20px;cursor:pointer;padding:0 4px;line-height:1;transition:color .18s}
.compose-close:hover{color:#fff}
.compose-fields{padding:0 16px}
.compose-field{display:flex;align-items:center;border-bottom:1px solid #f0f0f5;padding:10px 0}
.compose-field label{width:60px;font-size:13px;color:#888;flex-shrink:0}
.compose-field input{flex:1;border:none;outline:none;font-size:14px;color:#333;font-family:inherit}
.compose-body-area{flex:1;padding:12px 16px;min-height:160px;overflow-y:auto}
.compose-body-area textarea{width:100%;border:none;outline:none;font-size:14px;color:#333;resize:none;min-height:140px;font-family:inherit}
.compose-footer{display:flex;align-items:center;justify-content:space-between;padding:12px 16px;border-top:1px solid #f0f0f5;background:#fafbff}
.compose-tools{display:flex;gap:6px}
.compose-tool{width:30px;height:30px;border:1.5px solid #e8eaf0;border-radius:6px;background:#fff;cursor:pointer;font-size:15px;display:flex;align-items:center;justify-content:center;transition:all .18s}
.compose-tool:hover{border-color:#e94560;background:#fff5f7}
.compose-send-btn{padding:8px 24px;background:linear-gradient(90deg,#e94560,#f5a623);border:none;border-radius:20px;color:#fff;font-size:13px;font-weight:600;cursor:pointer;box-shadow:0 3px 10px rgba(233,69,96,.3);transition:all .2s}
.compose-send-btn:hover{transform:translateY(-1px)}
.compose-discard{background:none;border:none;color:#aaa;font-size:13px;cursor:pointer;padding:8px 10px;transition:color .18s}
.compose-discard:hover{color:#e94560}

/* Toast */
.toast{position:fixed;bottom:28px;left:50%;transform:translateX(-50%) translateY(20px);background:#333;color:#fff;padding:10px 22px;border-radius:24px;font-size:13px;opacity:0;transition:all .3s;pointer-events:none;z-index:9999}
.toast.show{opacity:1;transform:translateX(-50%) translateY(0)}

/* Notification bell + dropdown */
.notif-wrap{position:static}
.notif-btn{width:36px;height:36px;border-radius:50%;background:rgba(255,255,255,.08);border:none;cursor:pointer;font-size:18px;display:flex;align-items:center;justify-content:center;transition:background .18s;position:relative;flex-shrink:0}
.notif-btn:hover{background:rgba(255,255,255,.15)}
.notif-badge{position:absolute;top:-4px;right:-4px;width:16px;height:16px;border-radius:50%;background:#e94560;color:#fff;font-size:9px;font-weight:700;display:flex;align-items:center;justify-content:center;border:2px solid #16213e;pointer-events:none}
.notif-badge.hidden{display:none}
.notif-panel{position:fixed;top:64px;left:220px;width:320px;background:#fff;border-radius:14px;box-shadow:0 8px 32px rgba(0,0,0,.22);z-index:2000;overflow:hidden;display:none;flex-direction:column}
.notif-panel.show{display:flex}
.notif-panel-head{display:flex;align-items:center;justify-content:space-between;padding:14px 16px 10px;border-bottom:1px solid #f0f0f5}
.notif-panel-title{font-size:14px;font-weight:700;color:#1a1a2e}
.notif-mark-all{font-size:12px;color:#e94560;cursor:pointer;background:none;border:none;font-family:inherit;font-weight:600;padding:0}
.notif-mark-all:hover{text-decoration:underline}
.notif-list{max-height:340px;overflow-y:auto}
.notif-item{display:flex;align-items:flex-start;gap:10px;padding:12px 16px;border-bottom:1px solid #f5f5f8;cursor:pointer;transition:background .15s;position:relative}
.notif-item:hover{background:#fafbff}
.notif-item.unread{background:#fffbfc}
.notif-item.unread::before{content:'';position:absolute;left:6px;top:50%;transform:translateY(-50%);width:5px;height:5px;border-radius:50%;background:#e94560}
.notif-item-icon{font-size:22px;flex-shrink:0;margin-top:1px}
.notif-item-body{flex:1;min-width:0}
.notif-item-title{font-size:13px;font-weight:600;color:#1a1a2e;margin-bottom:2px}
.notif-item-time{font-size:11px;color:#bbb;margin-top:3px}
.notif-dot{width:8px;height:8px;border-radius:50%;background:#e94560;flex-shrink:0;margin-top:4px}
.notif-footer{padding:10px 16px;text-align:center;border-top:1px solid #f0f0f5}
.notif-footer span{font-size:12px;color:#e94560;cursor:pointer;font-weight:600}
.notif-footer span:hover{text-decoration:underline}

/* Tag filter chips */
.tag-filter-row{display:flex;gap:8px;padding:10px 16px 8px;flex-wrap:wrap;border-bottom:1px solid #f0f0f5;background:#fff}
.tag-chip{display:inline-flex;align-items:center;gap:4px;padding:5px 12px;border-radius:20px;font-size:12px;font-weight:600;cursor:pointer;border:1.5px solid #e8eaf0;color:#666;background:#fff;transition:all .18s;white-space:nowrap}
.tag-chip:hover{border-color:#e94560;color:#e94560;background:#fff5f7}
.tag-chip.active{border-color:#e94560;color:#e94560;background:rgba(233,69,96,.08)}

/* Confirm dialog */
.confirm-overlay{position:fixed;inset:0;background:rgba(0,0,0,.45);z-index:2000;display:none;align-items:center;justify-content:center}
.confirm-overlay.show{display:flex}
.confirm-box{background:#fff;border-radius:16px;padding:32px 28px 24px;width:340px;max-width:90vw;box-shadow:0 12px 40px rgba(0,0,0,.2);text-align:center;animation:popIn .2s ease}
@keyframes popIn{from{transform:scale(.9);opacity:0}to{transform:scale(1);opacity:1}}
.confirm-icon{font-size:40px;margin-bottom:14px}
.confirm-msg{font-size:15px;font-weight:600;color:#1a1a2e;margin-bottom:24px;line-height:1.6}
.confirm-actions{display:flex;gap:10px;justify-content:center}
.confirm-cancel{padding:9px 24px;border:1.5px solid #e8eaf0;border-radius:20px;background:#fff;color:#666;font-size:13px;font-weight:600;cursor:pointer;transition:all .18s;font-family:inherit}
.confirm-cancel:hover{border-color:#ccc;color:#333}
.confirm-ok{padding:9px 24px;background:linear-gradient(90deg,#e94560,#f5a623);border:none;border-radius:20px;color:#fff;font-size:13px;font-weight:600;cursor:pointer;box-shadow:0 3px 10px rgba(233,69,96,.3);transition:all .2s;font-family:inherit}
.confirm-ok:hover{transform:translateY(-1px);box-shadow:0 5px 15px rgba(233,69,96,.4)}

/* Skeleton loader */
.skeleton-item{padding:14px 16px;border-bottom:1px solid #f5f5f8}
.skeleton-line{border-radius:6px;background:linear-gradient(90deg,#f0f0f0 25%,#e0e0e0 50%,#f0f0f0 75%);background-size:200% 100%;animation:shimmer 1.4s infinite}
@keyframes shimmer{0%{background-position:200% 0}100%{background-position:-200% 0}}
.sk-avatar{width:36px;height:36px;border-radius:50%;background:linear-gradient(90deg,#f0f0f0 25%,#e0e0e0 50%,#f0f0f0 75%);background-size:200% 100%;animation:shimmer 1.4s infinite;flex-shrink:0}
.sk-row{display:flex;align-items:center;gap:10px;margin-bottom:8px}
.sk-title{height:13px;width:55%;margin-bottom:0}
.sk-time{height:11px;width:15%;margin-left:auto}
.sk-subject{height:12px;width:80%;margin-bottom:6px}
.sk-preview{height:11px;width:65%}

/* Detail panel toolbar (generated by app.js renderDetail) */
.detail-toolbar{display:flex;align-items:center;gap:6px;padding:12px 24px;background:#fff;border-bottom:1px solid #f0f0f5;flex-shrink:0;flex-wrap:wrap}
.toolbar-btn{display:inline-flex;align-items:center;gap:5px;padding:6px 14px;border:1.5px solid #e8eaf0;border-radius:20px;background:#fff;font-size:13px;color:#555;cursor:pointer;transition:all .18s;font-family:inherit;white-space:nowrap}
.toolbar-btn:hover{border-color:#e94560;color:#e94560;background:#fff5f7}
.toolbar-btn.danger:hover{border-color:#e53935;color:#e53935;background:#fff5f5}
.toolbar-btn.star-active{color:#f5a623;border-color:#f5a623}
.toolbar-sep{width:1px;height:20px;background:#e8eaf0;margin:0 2px;flex-shrink:0}
.toolbar-spacer{flex:1}

/* Detail body (generated by app.js renderDetail) */
.detail-body{padding:24px 32px;flex:1;overflow-y:auto}
.mail-detail-subject{font-size:20px;font-weight:700;color:#1a1a2e;margin-bottom:20px;line-height:1.4}
.mail-detail-meta{display:flex;align-items:flex-start;gap:14px;margin-bottom:24px;padding-bottom:20px;border-bottom:1px solid #f0f0f5}
.sender-avatar-lg{width:44px;height:44px;border-radius:50%;display:flex;align-items:center;justify-content:center;color:#fff;font-size:17px;font-weight:700;flex-shrink:0}
.meta-info{flex:1;min-width:0}
.meta-sender{font-size:15px;font-weight:700;color:#1a1a2e;margin-bottom:3px}
.meta-addr{font-size:12px;color:#888;line-height:1.8}
.meta-date{font-size:12px;color:#aaa;white-space:nowrap;padding-top:2px}

/* Light theme overrides */
body.light-theme .sidebar{background:linear-gradient(180deg,#2d3561 0%,#1e2a5e 60%,#1a237e 100%)}
body.light-theme{background:#eef0f5}
body.light-theme .mail-list-panel{background:#f7f8fc}
body.light-theme .detail-panel{background:#f0f2f7}
body.light-theme .panel-header{background:#f7f8fc}