:root{
  --bg:#0b1020;
  --panel:#111831;
  --panel-2:#17213f;
  --line:#273456;
  --text:#eff4ff;
  --muted:#a8b3d1;
  --accent:#5ea2ff;
  --accent-2:#7c4dff;
  --danger:#ff5d7a;
  --success:#31c48d;
  --shadow:0 20px 60px rgba(0,0,0,.35);
}
*{box-sizing:border-box}
html,body{margin:0;padding:0;font-family:Inter,Arial,sans-serif;background:radial-gradient(circle at top right,#182752 0,#0b1020 50%,#060913 100%);color:var(--text)}
a{text-decoration:none;color:inherit}
.login-body{min-height:100vh;display:grid;place-items:center;padding:24px}
.auth-shell,.reader-shell,.compose-shell{width:100%;display:grid;place-items:center;padding:24px}
.auth-card,.reader-card,.compose-card{
  width:min(760px,100%);
  background:rgba(17,24,49,.88);
  backdrop-filter:blur(18px);
  border:1px solid rgba(255,255,255,.08);
  border-radius:28px;
  box-shadow:var(--shadow);
  padding:32px;
}
.brand-badge{
  width:64px;height:64px;border-radius:18px;display:grid;place-items:center;
  background:linear-gradient(135deg,var(--accent),var(--accent-2));
  font-size:30px;margin-bottom:16px
}
h1{margin:0 0 8px;font-size:32px}
.subtitle{margin:0 0 24px;color:var(--muted);line-height:1.5}
.auth-form,.compose-form{display:grid;gap:12px}
label{font-size:14px;color:#c9d5f2}
input,select,textarea,button{
  width:100%;border:none;border-radius:16px;padding:14px 16px;font-size:15px
}
input,select,textarea{
  background:#0d1530;color:var(--text);border:1px solid #243155;outline:none
}
input:focus,select:focus,textarea:focus{border-color:var(--accent);box-shadow:0 0 0 3px rgba(94,162,255,.15)}
button,.btn{
  display:inline-flex;align-items:center;justify-content:center;gap:8px;
  background:#213055;color:#fff;border:1px solid #2c3f72;cursor:pointer;
  transition:.2s transform,.2s opacity,.2s background
}
button:hover,.btn:hover{transform:translateY(-1px);opacity:.96}
.btn-primary{background:linear-gradient(135deg,var(--accent),var(--accent-2));border:none}
.block{display:flex}
.grid.two{display:grid;grid-template-columns:repeat(2,1fr);gap:12px}
.small-note{margin-top:16px;color:var(--muted);font-size:14px}
.alert{margin:0 0 18px;padding:14px 16px;border-radius:16px}
.alert-error{background:rgba(255,93,122,.12);border:1px solid rgba(255,93,122,.35)}
.alert-success{background:rgba(49,196,141,.12);border:1px solid rgba(49,196,141,.35)}

.app-shell{display:grid;grid-template-columns:280px 1fr;min-height:100vh}
.sidebar{
  border-right:1px solid rgba(255,255,255,.06);
  background:rgba(7,11,24,.72);
  backdrop-filter:blur(12px);
  padding:24px;position:sticky;top:0;height:100vh;overflow:auto
}
.logo{font-size:24px;font-weight:700;margin-bottom:16px}
.sidebar-section{margin-top:28px}
.section-title{font-size:13px;text-transform:uppercase;letter-spacing:.08em;color:var(--muted);margin-bottom:10px}
.account-pill{background:var(--panel);padding:12px 14px;border-radius:16px;color:#d5e0ff;border:1px solid rgba(255,255,255,.05)}
.nav-link{
  display:block;padding:12px 14px;border-radius:14px;color:#dce5ff;margin-bottom:8px;
  border:1px solid transparent;background:transparent
}
.nav-link:hover,.nav-link.active{background:rgba(94,162,255,.12);border-color:rgba(94,162,255,.24)}
.nav-link.danger:hover{background:rgba(255,93,122,.12);border-color:rgba(255,93,122,.25)}
.main-panel{padding:28px}
.toolbar{display:flex;justify-content:space-between;gap:20px;align-items:end;margin-bottom:24px}
.toolbar h1{margin:0}
.toolbar p{margin:6px 0 0;color:var(--muted)}
.search-form{display:flex;gap:10px;align-items:center}
.search-form input{min-width:280px}
.mail-list{display:grid;gap:12px}
.mail-row{
  display:block;background:rgba(17,24,49,.78);border:1px solid rgba(255,255,255,.06);
  border-radius:22px;padding:18px;box-shadow:var(--shadow)
}
.mail-row.unread{border-color:rgba(94,162,255,.48);background:rgba(22,36,74,.92)}
.mail-row-top{display:flex;justify-content:space-between;gap:18px;margin-bottom:10px}
.mail-row-top span,.mail-meta{color:var(--muted);font-size:14px}
.mail-subject{font-size:18px;margin-bottom:8px}
.empty-card{
  padding:24px;border-radius:20px;background:rgba(17,24,49,.72);border:1px solid rgba(255,255,255,.06);color:var(--muted)
}
.reader-actions{display:flex;gap:12px;margin-bottom:18px}
.mail-details{display:grid;gap:8px;color:#d9e3fb;margin:18px 0 24px}
.message-body{
  background:#fff;color:#111827;border-radius:20px;padding:22px;overflow:auto
}
.message-body pre{white-space:pre-wrap;font-family:inherit}
.attachments{margin-bottom:20px}
.attachment-item{background:rgba(255,255,255,.06);padding:12px 14px;border-radius:14px;margin-top:8px}
@media (max-width: 980px){
  .app-shell{grid-template-columns:1fr}
  .sidebar{position:relative;height:auto}
  .toolbar{flex-direction:column;align-items:stretch}
  .search-form{width:100%}
  .search-form input{min-width:0;flex:1}
}
@media (max-width: 640px){
  .auth-card,.reader-card,.compose-card{padding:20px;border-radius:22px}
  .grid.two{grid-template-columns:1fr}
  .mail-row-top{flex-direction:column}
}