:root{--bg:#0d1117;--surface:#161b22;--surface2:#1c2333;--surface3:#252d3a;--hover:#1f2937;--primary:#6c5ce7;--primary-l:#a29bfe;--accent:#00cec9;--text:#e6edf3;--text2:#8b949e;--text3:#484f58;--border:rgba(255,255,255,.06);--border2:rgba(255,255,255,.1);--red:#f85149;--green:#3fb950;--orange:#d29922;--r:12px;--r-sm:8px;--glow:rgba(108,92,231,.25);--topbar-h:52px;--font:'Inter',system-ui,sans-serif}
*,*::before,*::after{box-sizing:border-box;margin:0;padding:0}
html,body{font-family:var(--font);background:var(--bg);color:var(--text);height:100%;overflow:hidden;-webkit-font-smoothing:antialiased;-webkit-tap-highlight-color:transparent}
#app{height:100%;position:relative}
.screen{display:none;height:100%;flex-direction:column}.screen.active{display:flex}
::-webkit-scrollbar{width:6px}::-webkit-scrollbar-track{background:transparent}::-webkit-scrollbar-thumb{background:var(--surface3);border-radius:6px}
input,textarea,select{font-family:var(--font);font-size:14px;color:var(--text);background:var(--surface2);border:1px solid var(--border2);border-radius:var(--r-sm);padding:10px 12px;outline:none;width:100%;transition:border .2s}
input:focus,textarea:focus,select:focus{border-color:var(--primary)}
input:-webkit-autofill{-webkit-box-shadow:0 0 0 1000px var(--surface2) inset!important;-webkit-text-fill-color:var(--text)!important}
/* ═══ LOGIN ═══ */
.login-container{display:flex;flex-direction:column;align-items:center;justify-content:center;min-height:100vh;padding:24px;background:radial-gradient(ellipse at 50% 20%,rgba(108,92,231,.1),transparent 60%),var(--bg)}
.login-logo{text-align:center;margin-bottom:36px}.logo-icon svg{width:64px;height:64px;filter:drop-shadow(0 0 16px var(--glow))}
.login-logo h1{font-size:28px;font-weight:700;margin-top:12px;background:linear-gradient(135deg,var(--primary-l),var(--accent));-webkit-background-clip:text;-webkit-text-fill-color:transparent}
.login-subtitle{color:var(--text2);font-size:13px;margin-top:4px}
.login-form{width:100%;max-width:380px}
.input-group{margin-bottom:16px}.input-group label{display:block;font-size:12px;font-weight:500;color:var(--text2);margin-bottom:5px}
.input-wrapper{position:relative;display:flex;align-items:center;background:var(--surface);border:1px solid var(--border2);border-radius:var(--r-sm);transition:border .2s,box-shadow .2s}
.input-wrapper:focus-within{border-color:var(--primary);box-shadow:0 0 0 3px var(--glow)}
.input-icon{width:18px;height:18px;color:var(--text3);margin-left:12px;flex-shrink:0}
.input-wrapper input{background:transparent;border:none;padding:12px}
.toggle-pw{background:none;border:none;cursor:pointer;padding:8px 12px}.toggle-pw svg{width:18px;height:18px;color:var(--text3)}
.server-settings{margin-bottom:16px}.server-settings summary{font-size:12px;color:var(--text2);cursor:pointer;padding:6px 0}
.settings-grid{display:grid;grid-template-columns:1fr 1fr;gap:10px;margin-top:10px}.settings-grid input{padding:10px}
.btn-primary{width:100%;padding:14px;border:none;border-radius:var(--r-sm);cursor:pointer;font-family:var(--font);font-size:15px;font-weight:600;color:#fff;background:linear-gradient(135deg,var(--primary),#8b5cf6);box-shadow:0 4px 16px var(--glow);display:flex;align-items:center;justify-content:center;gap:8px;transition:transform .12s}
.btn-primary:active{transform:scale(.97)}.btn-primary:disabled{opacity:.5}
.error-msg{color:var(--red);font-size:13px;margin-top:12px;text-align:center;padding:10px;background:rgba(248,81,73,.1);border-radius:var(--r-sm)}
.spinner{width:18px;height:18px;border:2px solid rgba(255,255,255,.2);border-top-color:#fff;border-radius:50%;animation:spin .6s linear infinite}
.spinner.large{width:32px;height:32px;border-width:3px}
@keyframes spin{to{transform:rotate(360deg)}}
.loading-indicator{display:flex;justify-content:center;padding:60px}
/* ═══ TOPBAR ═══ */
.topbar{display:flex;align-items:center;gap:8px;height:var(--topbar-h);padding:0 8px;background:var(--surface);border-bottom:1px solid var(--border);position:sticky;top:0;z-index:100}
.topbar-search{flex:1;display:flex;align-items:center;gap:10px;padding:8px 16px;background:var(--surface2);border-radius:24px;cursor:pointer;transition:background .15s;font-size:14px;color:var(--text3)}
.topbar-search:hover{background:var(--surface3)}
.topbar-search svg{width:18px;height:18px;flex-shrink:0}
.icon-btn{width:40px;height:40px;display:flex;align-items:center;justify-content:center;background:none;border:none;cursor:pointer;border-radius:50%;transition:background .12s;flex-shrink:0}
.icon-btn svg{width:20px;height:20px;color:var(--text)}
.icon-btn:hover{background:var(--hover)}.icon-btn.sm{width:32px;height:32px}.icon-btn.sm svg{width:16px;height:16px}
.avatar-btn{background:var(--primary);border-radius:50%}.avatar-btn span{color:#fff;font-weight:600;font-size:14px}
/* ═══ SEARCH ═══ */
.search-overlay{position:fixed;inset:0;z-index:300;background:var(--bg);animation:fadeIn .15s}
.search-bar-inner{display:flex;align-items:center;gap:8px;padding:6px 8px;border-bottom:1px solid var(--border)}
.search-bar-inner input{flex:1;background:transparent;border:none;font-size:16px;padding:10px}
@keyframes fadeIn{from{opacity:0}}
/* ═══ LAYOUT ═══ */
.app-layout{flex:1;display:flex;overflow:hidden}
/* ═══ SIDEBAR ═══ */
.sidebar-overlay{position:fixed;inset:0;background:rgba(0,0,0,.5);z-index:200;opacity:0;pointer-events:none;transition:opacity .25s;backdrop-filter:blur(2px)}
.sidebar-overlay.open{opacity:1;pointer-events:auto}
.sidebar{position:fixed;top:0;left:0;bottom:0;width:260px;max-width:80vw;background:var(--surface);z-index:210;display:flex;flex-direction:column;transform:translateX(-100%);transition:transform .25s cubic-bezier(.4,0,.2,1);border-right:1px solid var(--border);padding-top:8px}
.sidebar.open{transform:translateX(0)}
.sidebar-compose{padding:12px 16px}
.compose-btn{display:flex;align-items:center;gap:12px;width:100%;padding:14px 24px;background:var(--surface2);border:1px solid var(--border2);border-radius:28px;cursor:pointer;font-family:var(--font);font-size:14px;font-weight:500;color:var(--text);transition:box-shadow .2s,background .2s}
.compose-btn:hover{background:var(--surface3);box-shadow:0 2px 12px rgba(0,0,0,.3)}
.compose-btn svg{width:20px;height:20px;color:var(--primary-l)}
.folder-list{flex:1;overflow-y:auto;padding:4px 12px}
.folder-item{display:flex;align-items:center;gap:14px;padding:8px 16px;border-radius:24px;cursor:pointer;transition:background .12s;margin-bottom:2px;font-size:13px;font-weight:500}
.folder-item:hover{background:var(--hover)}
.folder-item.active{background:rgba(108,92,231,.15);color:var(--primary-l)}
.folder-item svg{width:18px;height:18px;color:var(--text2);flex-shrink:0}.folder-item.active svg{color:var(--primary-l)}
.folder-name{flex:1}.folder-badge{font-size:11px;font-weight:600;color:var(--primary-l)}
.sidebar-footer{padding:8px 12px;border-top:1px solid var(--border)}
.sidebar-link{display:flex;align-items:center;gap:14px;width:100%;padding:8px 16px;background:none;border:none;border-radius:24px;cursor:pointer;font-family:var(--font);font-size:13px;color:var(--text2);transition:background .12s}
.sidebar-link:hover{background:var(--hover)}.sidebar-link svg{width:18px;height:18px}
.sidebar-link.logout{color:var(--red)}.sidebar-link.logout svg{color:var(--red)}
/* ═══ MAIN AREA ═══ */
.main-area{flex:1;display:flex;flex-direction:column;overflow:hidden;min-width:0}
.folder-bar{display:flex;align-items:center;gap:8px;padding:8px 16px;border-bottom:1px solid var(--border)}
.folder-bar h2{font-size:14px;font-weight:600;flex:1}.folder-count{font-size:12px;color:var(--text3)}
/* ═══ MESSAGE LIST ═══ */
.message-list{flex:1;overflow-y:auto;-webkit-overflow-scrolling:touch}
.msg-row{display:flex;align-items:center;gap:0;padding:4px 8px 4px 16px;border-bottom:1px solid var(--border);cursor:pointer;transition:background .1s;min-height:48px;animation:rowIn .25s ease}
@keyframes rowIn{from{opacity:0;transform:translateY(4px)}}
.msg-row:hover{background:var(--hover)}
.msg-row.unread{background:rgba(108,92,231,.04)}
.msg-row.unread .msg-r-from{font-weight:600;color:var(--text)}
.msg-row.unread .msg-r-subject{color:var(--text);font-weight:500}
.msg-r-star{width:32px;height:32px;display:flex;align-items:center;justify-content:center;flex-shrink:0;cursor:pointer}
.msg-r-star svg{width:16px;height:16px;color:var(--text3);transition:color .15s}
.msg-r-star.flagged svg{color:var(--orange);fill:var(--orange)}
.msg-r-from{width:180px;font-size:13px;color:var(--text2);white-space:nowrap;overflow:hidden;text-overflow:ellipsis;flex-shrink:0;padding:0 8px}
.msg-r-content{flex:1;display:flex;align-items:baseline;gap:6px;min-width:0;overflow:hidden;padding-right:8px}
.msg-r-subject{font-size:13px;white-space:nowrap;overflow:hidden;text-overflow:ellipsis;color:var(--text2)}
.msg-r-preview{font-size:13px;color:var(--text3);white-space:nowrap;overflow:hidden;text-overflow:ellipsis;display:none}
.msg-r-date{font-size:11px;color:var(--text3);white-space:nowrap;flex-shrink:0;min-width:50px;text-align:right;padding-right:8px}
.msg-r-att{flex-shrink:0;color:var(--text3)}.msg-r-att svg{width:14px;height:14px}
.empty-state{flex:1;display:flex;flex-direction:column;align-items:center;justify-content:center;padding:60px 20px}
.empty-state svg{width:56px;height:56px;color:var(--text3);margin-bottom:12px;opacity:.5}
.empty-state p{color:var(--text3);font-size:14px}
.pagination{display:flex;align-items:center;justify-content:center;gap:12px;padding:12px;border-top:1px solid var(--border)}
.pg-btn{width:36px;height:36px;display:flex;align-items:center;justify-content:center;background:var(--surface2);border:1px solid var(--border);border-radius:50%;cursor:pointer}
.pg-btn:disabled{opacity:.3;cursor:default}.pg-btn svg{width:16px;height:16px;color:var(--text)}
#pageInfo{font-size:12px;color:var(--text2)}
/* ═══ READING PANE ═══ */
.reading-pane{position:fixed;inset:0;z-index:150;background:var(--bg);display:flex;flex-direction:column;animation:slideR .2s ease}
@keyframes slideR{from{transform:translateX(100%)}}
.rp-header{display:flex;align-items:center;justify-content:space-between;height:var(--topbar-h);padding:0 4px;background:var(--surface);border-bottom:1px solid var(--border)}
.rp-actions{display:flex;gap:0}
.ai-btn svg{color:var(--accent)}.del-btn svg{color:var(--red)}
.rp-body{flex:1;overflow-y:auto;padding:20px 16px;-webkit-overflow-scrolling:touch}
.msg-detail-subject{font-size:20px;font-weight:600;line-height:1.3;margin-bottom:16px}
.msg-sender-row{display:flex;align-items:center;gap:12px;margin-bottom:16px}
.msg-sender-av{width:40px;height:40px;border-radius:50%;display:flex;align-items:center;justify-content:center;font-size:16px;font-weight:600;color:#fff;flex-shrink:0}
.msg-sender-info{flex:1;min-width:0}.msg-sender-name{font-weight:600;font-size:14px}.msg-sender-email{font-size:12px;color:var(--text2)}
.msg-detail-date{font-size:11px;color:var(--text3)}
.msg-recipients{font-size:12px;color:var(--text2);margin-bottom:16px;padding-bottom:16px;border-bottom:1px solid var(--border)}.msg-recipients span{color:var(--text3)}
.msg-html-body{font-size:14px;line-height:1.7;word-wrap:break-word}.msg-html-body img{max-width:100%;height:auto;border-radius:8px}.msg-html-body a{color:var(--primary-l)}
.msg-attachments{margin-top:20px;padding-top:16px;border-top:1px solid var(--border)}.msg-attachments h4{font-size:13px;color:var(--text2);margin-bottom:8px}
.att-item{display:flex;align-items:center;gap:10px;padding:8px 12px;background:var(--surface);border-radius:var(--r-sm);margin-bottom:6px;text-decoration:none;color:var(--text);transition:background .12s}
.att-item:hover{background:var(--surface2)}
.att-icon{width:32px;height:32px;border-radius:6px;background:var(--surface3);display:flex;align-items:center;justify-content:center}.att-icon svg{width:16px;height:16px;color:var(--primary-l)}
.att-info{flex:1;min-width:0}.att-name{font-size:12px;font-weight:500;white-space:nowrap;overflow:hidden;text-overflow:ellipsis}.att-size{font-size:11px;color:var(--text3)}
/* ═══ FAB ═══ */
.fab{position:fixed;bottom:20px;right:20px;width:56px;height:56px;border-radius:16px;border:none;cursor:pointer;background:linear-gradient(135deg,var(--primary),#8b5cf6);box-shadow:0 4px 20px var(--glow);display:flex;align-items:center;justify-content:center;z-index:90;transition:transform .15s}
.fab:active{transform:scale(.9)}.fab svg{width:24px;height:24px;color:#fff}
/* ═══ COMPOSE ═══ */
.compose-modal{position:fixed;inset:0;z-index:400;background:rgba(0,0,0,.5);display:flex;align-items:flex-end;justify-content:center}
.compose-window{width:100%;max-width:600px;max-height:85vh;background:var(--surface);border-radius:var(--r) var(--r) 0 0;display:flex;flex-direction:column;animation:slideUp .25s ease}
@keyframes slideUp{from{transform:translateY(100%)}}
.compose-header{display:flex;align-items:center;justify-content:space-between;padding:10px 12px;background:var(--surface2);border-radius:var(--r) var(--r) 0 0;font-size:14px;font-weight:500}
.compose-fields{border-bottom:1px solid var(--border)}
.cf{display:flex;align-items:center;border-bottom:1px solid var(--border);padding:0 12px}
.cf label{font-size:13px;color:var(--text2);width:46px;flex-shrink:0;font-weight:500}
.cf input{border:none;background:transparent;padding:10px 0;font-size:14px}
.compose-editor{flex:1;overflow-y:auto;min-height:150px}
.compose-editable{padding:14px;min-height:150px;font-size:14px;line-height:1.6;outline:none}
.compose-editable:empty::before{content:attr(placeholder);color:var(--text3)}
.compose-att-list{padding:0 12px;display:flex;flex-wrap:wrap;gap:6px}
.compose-att-item{display:inline-flex;align-items:center;gap:6px;padding:4px 10px;background:var(--surface2);border-radius:16px;font-size:12px}
.compose-att-remove{background:none;border:none;cursor:pointer;color:var(--text3);font-size:14px}
.compose-bottom{display:flex;align-items:center;justify-content:space-between;padding:8px 12px;border-top:1px solid var(--border)}
.send-btn{display:flex;align-items:center;gap:8px;padding:8px 22px;background:linear-gradient(135deg,var(--primary),#8b5cf6);border:none;border-radius:20px;cursor:pointer;font-family:var(--font);font-size:14px;font-weight:600;color:#fff;transition:transform .12s}
.send-btn:active{transform:scale(.95)}.send-btn svg{width:16px;height:16px}
.compose-tools{display:flex;gap:4px}
.tool-btn{width:36px;height:36px;display:flex;align-items:center;justify-content:center;background:none;border:none;cursor:pointer;border-radius:50%;transition:background .12s;color:var(--text2)}
.tool-btn:hover{background:var(--hover)}.tool-btn svg{width:18px;height:18px}
.ai-tool svg{color:var(--accent)}
/* ═══ AI PANEL ═══ */
.ai-panel{position:fixed;bottom:0;right:0;left:0;z-index:450;background:rgba(0,0,0,.5);display:flex;align-items:flex-end;justify-content:center;animation:fadeIn .15s}
.ai-panel-inner{width:100%;max-width:500px;background:var(--surface);border-radius:var(--r) var(--r) 0 0;animation:slideUp .25s ease}
.ai-header{display:flex;align-items:center;gap:10px;padding:14px 16px;border-bottom:1px solid var(--border);font-weight:600;font-size:15px}
.ai-header svg{width:22px;height:22px;color:var(--accent)}.ai-header span{flex:1}
.ai-body{padding:16px}
.ai-option-group{margin-bottom:14px}.ai-option-group>label{font-size:12px;font-weight:500;color:var(--text2);margin-bottom:8px;display:block}
.ai-tones{display:flex;gap:6px;flex-wrap:wrap}
.tone-btn{padding:6px 14px;border-radius:16px;border:1px solid var(--border2);background:transparent;color:var(--text2);font-family:var(--font);font-size:12px;cursor:pointer;transition:all .15s}
.tone-btn.active{background:var(--primary);border-color:var(--primary);color:#fff}
.ai-option-group textarea{resize:none;font-size:13px}
.ai-generate-btn{width:100%;padding:12px;border:none;border-radius:var(--r-sm);background:linear-gradient(135deg,var(--accent),#00b894);color:#fff;font-family:var(--font);font-size:14px;font-weight:600;cursor:pointer;display:flex;align-items:center;justify-content:center;gap:8px;transition:transform .12s;margin-bottom:12px}
.ai-generate-btn:active{transform:scale(.97)}
.ai-result{background:var(--surface2);border-radius:var(--r-sm);padding:12px;margin-top:8px}
.ai-result>label{font-size:11px;color:var(--text2);margin-bottom:6px;display:block}
.ai-result-text{font-size:13px;line-height:1.6;max-height:200px;overflow-y:auto;padding:8px;background:var(--surface);border-radius:6px;margin-bottom:10px;outline:none;border:1px solid var(--border)}
.ai-result-actions{display:flex;gap:8px}
.btn-sm{padding:6px 16px;border:1px solid var(--border2);background:transparent;color:var(--text);border-radius:16px;font-family:var(--font);font-size:12px;cursor:pointer;transition:background .12s}
.btn-sm:hover{background:var(--hover)}.btn-sm.primary{background:var(--primary);border-color:var(--primary);color:#fff}
/* ═══ SETTINGS ═══ */
.settings-modal{position:fixed;inset:0;z-index:500;background:var(--bg);display:flex;flex-direction:column;animation:fadeIn .15s}
.settings-inner{flex:1;display:flex;flex-direction:column;max-width:640px;width:100%;margin:0 auto}
.settings-header{display:flex;align-items:center;justify-content:space-between;padding:12px 16px;border-bottom:1px solid var(--border)}
.settings-header h2{font-size:18px}
.settings-body{flex:1;overflow-y:auto;padding:16px}
.settings-tabs{display:flex;gap:4px;margin-bottom:20px;border-bottom:1px solid var(--border);padding-bottom:0}
.stab{padding:10px 16px;background:none;border:none;border-bottom:2px solid transparent;cursor:pointer;font-family:var(--font);font-size:13px;font-weight:500;color:var(--text2);transition:all .15s}
.stab.active{color:var(--primary-l);border-bottom-color:var(--primary)}
.stab-content{display:none}.stab-content.active{display:block}
.s-group{margin-bottom:16px}.s-group>label{display:block;font-size:12px;font-weight:500;color:var(--text2);margin-bottom:6px}
.s-group select{appearance:none;cursor:pointer;background-image:url("data:image/svg+xml,%3Csvg viewBox='0 0 12 8' fill='%238b949e' xmlns='http://www.w3.org/2000/svg'%3E%3Cpath d='M1 1.5l5 5 5-5'/%3E%3C/svg%3E");background-repeat:no-repeat;background-position:right 12px center;background-size:12px;padding-right:32px}
.s-hint{font-size:11px;color:var(--text3);margin-top:4px;display:block}
.ai-info{background:var(--surface2);border-radius:var(--r-sm);padding:12px;margin-top:8px}.ai-info p{font-size:12px;color:var(--text2);margin-bottom:4px}
.sig-toolbar{display:flex;gap:2px;margin-bottom:6px;padding:6px;background:var(--surface2);border-radius:var(--r-sm) var(--r-sm) 0 0;border:1px solid var(--border2);border-bottom:none}
.sig-toolbar button{width:32px;height:28px;display:flex;align-items:center;justify-content:center;background:none;border:none;cursor:pointer;color:var(--text2);border-radius:4px;font-size:13px}
.sig-toolbar button:hover{background:var(--hover)}
.sig-editor{min-height:120px;padding:12px;background:var(--surface2);border:1px solid var(--border2);border-radius:0 0 var(--r-sm) var(--r-sm);font-size:13px;line-height:1.6;outline:none}
.sig-editor:empty::before{content:attr(placeholder);color:var(--text3)}
.sig-source{min-height:120px;border-radius:0 0 var(--r-sm) var(--r-sm);font-family:monospace;font-size:12px;resize:vertical}
.save-settings-btn{margin-top:20px}
/* ═══ TOAST ═══ */
.toast-container{position:fixed;bottom:80px;left:50%;transform:translateX(-50%);z-index:600;display:flex;flex-direction:column;gap:6px;align-items:center}
.toast{padding:10px 20px;border-radius:8px;font-size:13px;font-weight:500;box-shadow:0 6px 24px rgba(0,0,0,.4);animation:toastIn .2s ease,toastOut .2s ease 2.8s forwards;white-space:nowrap}
.toast.success{background:rgba(63,185,80,.9);color:#fff}.toast.error{background:rgba(248,81,73,.9);color:#fff}.toast.info{background:rgba(108,92,231,.9);color:#fff}
@keyframes toastIn{from{opacity:0;transform:translateY(16px)}}@keyframes toastOut{to{opacity:0;transform:translateY(-8px)}}
/* ═══ MOBILE ═══ */
@media(max-width:767px){.msg-r-from{width:120px}.msg-r-preview{display:none}}
/* ═══ DESKTOP ═══ */
@media(min-width:768px){
.sidebar{transform:translateX(0);position:relative;z-index:1;width:240px;flex-shrink:0;padding-top:0}
.sidebar-overlay{display:none!important}
#menuBtn{display:none}
.reading-pane{position:relative;flex:1;animation:none;border-left:1px solid var(--border)}
.compose-window{border-radius:var(--r);position:fixed;bottom:16px;right:16px;width:480px;max-height:70vh;box-shadow:0 8px 32px rgba(0,0,0,.5)}
.compose-modal{background:transparent;align-items:flex-end;justify-content:flex-end}
.fab{display:none}
.msg-r-preview{display:block}
}