:root{--bg:#f5f7fb;--surface:#fff;--surface2:#f0f3f8;--border:#dde3ec;--text:#1f2937;--muted:#6b7280;--blue:#0b57d0;--blue2:#dceaff;--shadow:0 22px 60px rgba(25,35,55,.17)}
*{box-sizing:border-box}html,body{margin:0;min-height:100%;font-family:Inter,system-ui,-apple-system,"Segoe UI",sans-serif;background:var(--bg);color:var(--text)}button,input,textarea,select{font:inherit}button{cursor:pointer}.hidden{display:none!important}
.login-shell{min-height:100vh;display:grid;place-items:center;padding:24px;background:radial-gradient(circle at 10% 0,#dfeaff 0,transparent 32%),radial-gradient(circle at 100% 0,#eee7ff 0,transparent 28%),#f8faff}
.login-card{width:min(440px,100%);padding:32px;background:#fff;border:1px solid var(--border);border-radius:24px;box-shadow:var(--shadow)}
.brand{display:flex;align-items:center;gap:11px}.brand b,.brand small{display:block}.brand small{color:var(--muted);margin-top:2px}
.logo{width:44px;height:44px;border-radius:14px;display:grid;place-items:center;background:linear-gradient(135deg,#0b57d0,#714dff);color:#fff;font-weight:900}.logo.small{width:36px;height:36px;border-radius:11px}
.login-card h1{font-size:30px;margin:28px 0 8px}.login-card>p{color:var(--muted);margin:0 0 23px}
.login-card label{display:grid;gap:7px;font-size:13px;font-weight:650;margin:14px 0}.login-card input{padding:13px 14px;border:1px solid #ccd4e0;border-radius:12px;outline:0}.login-card input:focus{border-color:var(--blue);box-shadow:0 0 0 3px rgba(11,87,208,.12)}
.primary{border:0;background:var(--blue);color:#fff;border-radius:11px;padding:11px 17px;font-weight:750}.login-card .primary{width:100%;margin-top:5px;padding:13px}.error{min-height:18px;color:#d93025;font-size:13px;margin-top:10px}
.app{min-height:100vh;display:grid;grid-template-columns:245px 1fr;grid-template-rows:68px 1fr}
header{grid-column:1/-1;display:grid;grid-template-columns:245px minmax(280px,700px) 1fr;gap:18px;align-items:center;padding:0 17px;border-bottom:1px solid var(--border);background:var(--surface);position:sticky;top:0;z-index:20}
.search{display:flex;gap:9px;align-items:center;background:var(--surface2);border-radius:13px;padding:0 13px;height:43px}.search input{flex:1;border:0;outline:0;background:transparent}.head-actions{display:flex;justify-content:flex-end;gap:6px}.icon{width:38px;height:38px;border:0;border-radius:10px;background:transparent;color:inherit}.icon:hover{background:var(--surface2)}.avatar,.sender-avatar{border:0;border-radius:50%;display:grid;place-items:center;background:linear-gradient(135deg,#0b57d0,#714dff);color:#fff;font-weight:800}.avatar{width:38px;height:38px}
aside{grid-row:2;padding:17px 13px;background:var(--surface);border-right:1px solid var(--border);display:flex;flex-direction:column;gap:16px}.compose{border:0;border-radius:16px;background:var(--blue2);color:var(--blue);font-weight:750;padding:13px 17px;width:145px}.account-switcher{display:grid;gap:6px}.account-switcher span{font-size:11px;color:var(--muted);text-transform:uppercase;font-weight:750}.account-switcher select{width:100%;padding:9px;border:1px solid var(--border);border-radius:10px;background:#fff}
nav{display:grid;gap:3px}.nav{display:grid;grid-template-columns:26px 1fr;border:0;background:transparent;text-align:left;padding:10px 12px;border-radius:10px;color:inherit}.nav:hover,.nav.active{background:var(--blue2);color:var(--blue)}.side-bottom{margin-top:auto;display:grid;gap:7px}.secondary{border:1px solid var(--border);background:var(--surface);color:inherit;padding:9px 12px;border-radius:10px}.ghost{border:0;background:transparent;color:var(--muted);padding:9px}.full{width:100%}
main{grid-column:2;grid-row:2;display:grid;grid-template-columns:minmax(330px,430px) 1fr;min-height:0}.list-pane{background:var(--surface);border-right:1px solid var(--border)}.pane-title{height:75px;border-bottom:1px solid var(--border);display:flex;align-items:center;justify-content:space-between;padding:13px 16px}.pane-title h2{margin:0;font-size:19px}.pane-title span{font-size:12px;color:var(--muted)}
.mail-list{height:calc(100vh - 143px);overflow:auto}.mail-item{display:grid;grid-template-columns:40px 1fr auto;gap:10px;padding:14px;border-bottom:1px solid var(--border);cursor:pointer}.mail-item:hover{background:var(--surface2)}.mail-item.unread .from,.mail-item.unread .subject{font-weight:800}.mail-av{width:38px;height:38px;border-radius:50%;display:grid;place-items:center;background:#e7eaf0;font-weight:800}.mail-mid{min-width:0}.from,.subject,.preview{overflow:hidden;text-overflow:ellipsis;white-space:nowrap}.subject{font-size:14px;margin-top:3px}.preview{font-size:12px;color:var(--muted);margin-top:4px}.mail-item time{font-size:11px;color:var(--muted)}
.reader{background:var(--surface);min-width:0}.empty{height:100%;display:grid;place-items:center;align-content:center;text-align:center;color:var(--muted)}.empty>div{font-size:40px}.empty h3{color:var(--text);margin:9px 0 5px}.empty p{margin:0}.message{padding:18px 24px}.message-tools{display:flex;align-items:center;gap:8px}.message-tools span{flex:1}.message h1{font-size:25px;margin:24px 0 18px}.from-row{display:grid;grid-template-columns:44px 1fr auto;align-items:center;gap:10px}.sender-avatar{width:40px;height:40px}.from-row b,.from-row small{display:block}.from-row small,.from-row time{font-size:12px;color:var(--muted)}.content{margin-top:28px;line-height:1.65;white-space:pre-wrap}
.modal{position:fixed;inset:0;background:rgba(15,23,42,.45);backdrop-filter:blur(5px);display:grid;place-items:center;padding:22px;z-index:60}.modal-card{width:min(520px,100%);background:#fff;border-radius:20px;padding:22px;box-shadow:var(--shadow)}.modal-card.large{width:min(700px,100%)}.modal-head{display:flex;justify-content:space-between;align-items:flex-start;border-bottom:1px solid var(--border);padding-bottom:15px}.modal-head h2{margin:0}.modal-head p{margin:5px 0 0;color:var(--muted)}.providers{display:grid;grid-template-columns:repeat(3,1fr);gap:12px}.provider{display:flex;align-items:center;gap:11px;text-align:left;border:1px solid var(--border);border-radius:14px;background:#fff;padding:15px}.provider:hover{border-color:#9cb7ea;background:#f8fbff}.provider>span{width:38px;height:38px;border-radius:10px;display:grid;place-items:center;color:#fff;font-weight:900}.provider.google>span{background:#4285f4}.provider.microsoft>span{background:#2563eb}.provider.zoho>span{background:#ef4444}.provider b,.provider small{display:block}.provider small{color:var(--muted);margin-top:3px}.notice{margin-top:15px;background:#f5f7fb;border-radius:12px;padding:12px;color:var(--muted);font-size:12px}.connected{display:grid;gap:8px;margin:17px 0}.connected-row{display:flex;align-items:center;justify-content:space-between;border:1px solid var(--border);border-radius:12px;padding:11px}.connected-row small{display:block;color:var(--muted)}
.compose-window{position:fixed;right:22px;bottom:18px;width:min(560px,calc(100vw - 30px));height:540px;background:#fff;border:1px solid var(--border);border-radius:16px;box-shadow:var(--shadow);z-index:55;display:grid;grid-template-rows:48px 44px 44px 1fr 58px;overflow:hidden}.compose-head{background:#202124;color:#fff;display:flex;align-items:center;justify-content:space-between;padding:0 13px}.compose-window>input{border:0;border-bottom:1px solid var(--border);padding:0 13px;outline:0}.compose-window textarea{border:0;outline:0;resize:none;padding:13px}.compose-foot{display:flex;align-items:center;gap:12px;padding:9px 12px;border-top:1px solid var(--border)}.compose-foot span{font-size:12px;color:var(--muted)}
.toast{position:fixed;left:50%;bottom:20px;transform:translateX(-50%);background:#202124;color:white;padding:10px 14px;border-radius:9px;z-index:90}
@media(max-width:900px){header{grid-template-columns:auto 1fr auto}.brand small{display:none}.app{grid-template-columns:210px 1fr}main{grid-template-columns:330px 1fr}.providers{grid-template-columns:1fr}}
@media(max-width:700px){aside{display:none}.app{grid-template-columns:1fr}main{grid-column:1;grid-template-columns:1fr}.reader{display:none}header{grid-template-columns:auto 1fr auto}.brand div{display:none}.provider{padding:12px}}

/* Product polish: a restrained palette and simple, operable controls. */
.login-shell{background:#f8fafc}.login-card{border-radius:12px;box-shadow:0 8px 28px rgba(20,30,50,.08)}
.logo,.avatar,.sender-avatar{background:var(--blue);border-radius:9px}.avatar,.sender-avatar{border-radius:50%}
.compose,.provider,.modal-card,.compose-window{border-radius:9px}.modal{backdrop-filter:none;background:rgba(15,23,42,.32)}
.check{display:flex!important;align-items:center;font-weight:400!important}.check input{width:16px;height:16px}
.mail-item{width:100%;text-align:left;border:0;border-bottom:1px solid var(--border);background:#fff;color:var(--text);font-weight:400;align-items:start}
.mail-item:focus-visible,.icon:focus-visible,.nav:focus-visible,.secondary:focus-visible,.primary:focus-visible,.provider:focus-visible{outline:2px solid var(--blue);outline-offset:2px}
.mail-mid .from,.mail-mid .subject,.mail-mid .preview{display:block}.mail-empty{padding:24px;color:var(--muted)}
.message-tools,.reply-tools{display:flex;gap:7px;flex-wrap:wrap}.reply-tools{margin-top:24px}.content{white-space:pre-wrap;overflow-wrap:anywhere}
.mail-frame{display:block;width:100%;min-height:450px;border:0;background:#fff}
.compose-window{grid-template-rows:48px 43px 43px 43px minmax(100px,1fr) 58px}
.compose-head small{font-size:12px;font-weight:400;color:#cbd5e1}
.address-extra{display:flex;border-bottom:1px solid var(--border)}.address-extra input{width:50%;border:0;padding:0 13px;outline:0}.address-extra input+input{border-left:1px solid var(--border)}
.stack{display:grid;gap:10px;margin-top:12px}.stack label{display:grid;gap:5px}.stack input,.stack select{width:100%;padding:10px;border:1px solid var(--border);border-radius:6px}
.admin-card{width:min(860px,95vw);max-height:90vh;overflow:auto}.admin-users{display:grid;gap:8px}.admin-user{display:flex;align-items:center;flex-wrap:wrap;gap:7px;padding:9px;border-bottom:1px solid var(--border)}.admin-user span{flex:1;min-width:220px}
.loading-overlay{position:fixed;inset:0;z-index:110;background:rgba(255,255,255,.45);display:flex;align-items:center;justify-content:center;gap:7px}
.loading-overlay span{width:11px;height:11px;border-radius:2px;background:var(--blue);animation:loading-squares .99s ease-in-out infinite;opacity:.45}
.loading-overlay span:nth-child(2){animation-delay:.33s}.loading-overlay span:nth-child(3){animation-delay:.66s}
@keyframes loading-squares{0%,100%{transform:scale(.8);opacity:.45}33%{transform:scale(1.18);opacity:1}}
.offline{position:fixed;bottom:14px;left:14px;background:#202124;color:#fff;padding:9px 13px;border-radius:6px;z-index:100}
@media(prefers-reduced-motion:reduce){.loading-overlay span{animation:none;opacity:1}}
@media(max-width:700px){
  .app{grid-template-columns:1fr;grid-template-rows:60px auto minmax(0,1fr)}
  header{grid-template-columns:38px minmax(0,1fr) auto;gap:8px;padding:0 9px}.head-actions{gap:0}.head-actions .icon{width:31px}.avatar{width:31px;height:31px}
  aside{display:flex;grid-column:1;grid-row:2;padding:9px;gap:8px;border-right:0;border-bottom:1px solid var(--border)}
  aside .compose{width:auto;padding:8px 12px}.account-switcher span{display:none}.account-switcher select{padding:7px}
  aside nav{display:flex;overflow-x:auto;gap:3px}.nav{display:flex;white-space:nowrap;padding:8px}.side-bottom{display:flex;margin:0}.side-bottom button{width:auto}
  main{grid-column:1;grid-row:3;display:block}.mail-list{height:calc(100vh - 230px)}
  .reader{display:none}.app.reading .reader{display:block}.app.reading .list-pane{display:none}
  .message{padding:14px}.message h1{font-size:21px}.message-tools .secondary{padding:6px}
  .modal-card{max-height:90vh;overflow:auto}.compose-window{right:0;bottom:0;width:100%;height:min(85vh,650px)}
}