:root {
  --bg: #f4f7fb;
  --surface: #ffffff;
  --surface-2: #f8fafc;
  --text: #152033;
  --muted: #6d7789;
  --line: #e2e8f0;
  --primary: #2458e6;
  --primary-dark: #173da9;
  --nav: #0d1729;
  --nav-2: #15243d;
  --success: #11855f;
  --warning: #a96005;
  --danger: #c03a48;
  --shadow: 0 15px 40px rgba(22, 37, 66, .08);
  --radius: 18px;
}

* { box-sizing: border-box; }
html { min-height: 100%; background: var(--bg); }
body { margin: 0; min-height: 100vh; font-family: Inter, ui-sans-serif, system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif; color: var(--text); background: var(--bg); }
a { color: var(--primary); text-decoration: none; }
a:hover { color: var(--primary-dark); }
button, input, textarea, select { font: inherit; }
button:disabled { opacity: .45; cursor: not-allowed; }

.app-shell { min-height: 100vh; display: grid; grid-template-columns: 250px minmax(0, 1fr); }
.sidebar { position: sticky; top: 0; height: 100vh; display: flex; flex-direction: column; background: linear-gradient(180deg, var(--nav), #0a1220); color: #fff; padding: 24px 18px; }
.brand { color: #fff; display: flex; align-items: center; gap: 12px; padding: 0 8px 28px; }
.brand:hover { color: #fff; }
.brand-mark { width: 42px; height: 42px; border-radius: 13px; display: inline-grid; place-items: center; font-weight: 900; letter-spacing: -.04em; color: #fff; background: linear-gradient(145deg, #3972ff, #6c3fff); box-shadow: 0 8px 24px rgba(61, 99, 255, .32); }
.brand strong, .login-brand strong { display: block; font-size: 15px; }
.brand small, .login-brand small { display: block; color: #91a1bb; margin-top: 2px; font-size: 12px; }
.sidebar nav { display: grid; gap: 5px; }
.sidebar nav a { color: #aebbd0; padding: 11px 13px; border-radius: 10px; font-size: 14px; font-weight: 650; }
.sidebar nav a:hover, .sidebar nav a.active { color: #fff; background: var(--nav-2); }
.nav-label { color: #65758d; text-transform: uppercase; font-size: 10px; letter-spacing: .13em; font-weight: 800; padding: 22px 13px 6px; }
.sidebar-user { margin-top: auto; padding: 14px 8px 0; border-top: 1px solid rgba(255,255,255,.08); display: grid; grid-template-columns: auto 1fr auto; align-items: center; gap: 10px; }
.sidebar-user strong { display: block; font-size: 13px; }
.sidebar-user small { display: block; color: #8797b1; font-size: 11px; margin-top: 2px; }
.logout { color: #8393ac; font-size: 20px; }

.main { min-width: 0; padding: 34px 38px 60px; }
.page-header { display: flex; align-items: flex-start; justify-content: space-between; gap: 20px; margin-bottom: 26px; }
.page-header h1 { font-size: clamp(28px, 3vw, 40px); letter-spacing: -.035em; margin: 4px 0 6px; }
.page-header p { margin: 0; color: var(--muted); }
.eyebrow { color: var(--primary); font-size: 11px; font-weight: 850; text-transform: uppercase; letter-spacing: .14em; }
.back-link { display: inline-block; margin-bottom: 8px; font-size: 13px; font-weight: 700; }

.card { background: var(--surface); border: 1px solid var(--line); border-radius: var(--radius); box-shadow: var(--shadow); }
.card-header { display: flex; justify-content: space-between; align-items: flex-start; gap: 16px; padding: 22px 24px; border-bottom: 1px solid var(--line); }
.card-header h2, .card h2 { margin: 0; font-size: 18px; letter-spacing: -.02em; }
.card-header p, .card > p { color: var(--muted); margin: 5px 0 0; font-size: 13px; }

.button { display: inline-flex; align-items: center; justify-content: center; min-height: 42px; padding: 10px 16px; border-radius: 10px; border: 1px solid transparent; font-weight: 750; font-size: 13px; cursor: pointer; transition: .18s ease; }
.button:hover { transform: translateY(-1px); }
.button.primary { color: #fff; background: linear-gradient(135deg, var(--primary), #5c3cf0); box-shadow: 0 10px 24px rgba(50, 79, 221, .24); }
.button.primary:hover { color: #fff; }
.button.secondary { color: var(--text); background: #fff; border-color: var(--line); }
.button.ghost { color: var(--primary); background: transparent; }
.button.wide { width: 100%; }

.stat-grid { display: grid; grid-template-columns: repeat(4, minmax(0, 1fr)); gap: 16px; margin-bottom: 22px; }
.stat-card { background: #fff; border: 1px solid var(--line); border-radius: 16px; padding: 20px; box-shadow: var(--shadow); }
.stat-card span { color: var(--muted); font-size: 12px; font-weight: 750; }
.stat-card strong { display: block; font-size: 34px; letter-spacing: -.04em; margin: 8px 0 3px; }
.stat-card small { color: #97a1b0; }
.content-grid { display: grid; grid-template-columns: minmax(0, 2fr) minmax(280px, 1fr); gap: 20px; }
.span-2 { min-width: 0; }

.message-list { min-width: 0; }
.message-row { color: var(--text); display: grid; grid-template-columns: auto minmax(0, 1fr) auto auto 140px; align-items: center; gap: 14px; padding: 16px 20px; border-bottom: 1px solid var(--line); }
.message-row:last-child { border-bottom: 0; }
.message-row:hover { color: var(--text); background: #f8faff; }
.message-row.unread { background: #f7f9ff; }
.message-row.unread .message-main strong, .message-row.unread .message-main span { font-weight: 800; }
.message-main { min-width: 0; }
.message-main strong, .message-main span, .message-main small { display: block; overflow: hidden; text-overflow: ellipsis; white-space: nowrap; }
.message-main strong { font-size: 13px; }
.message-main span { font-size: 14px; margin-top: 3px; }
.message-main small { color: var(--muted); margin-top: 4px; font-size: 12px; }
.message-row time { color: var(--muted); font-size: 11px; text-align: right; }
.compact .message-row { grid-template-columns: auto minmax(0, 1fr) auto auto 118px; }
.compact .message-main small { display: none; }

.avatar { width: 44px; height: 44px; border-radius: 50%; display: inline-grid; place-items: center; color: #fff; font-size: 12px; font-weight: 850; background: linear-gradient(145deg, #2d6cff, #7e45ef); flex: 0 0 auto; }
.avatar.small { width: 36px; height: 36px; font-size: 10px; }
.mailbox-pill { background: #eef3ff; color: #3459b8; border: 1px solid #dfe8ff; padding: 5px 8px; border-radius: 999px; font-size: 10px; font-weight: 750; white-space: nowrap; }
.status { display: inline-flex; width: fit-content; align-items: center; justify-content: center; border-radius: 999px; padding: 5px 9px; font-size: 10px; font-weight: 800; white-space: nowrap; }
.status.open { color: #2852ba; background: #edf2ff; }
.status.pending { color: #925607; background: #fff5dc; }
.status.resolved { color: #0a754f; background: #e8f8f1; }
.status.spam { color: #a33a45; background: #ffedf0; }
.status.large { font-size: 12px; padding: 8px 12px; }

.mailbox-list { padding: 6px 20px 12px; }
.mailbox-item { display: grid; grid-template-columns: auto 1fr auto; gap: 12px; align-items: center; padding: 14px 2px; border-bottom: 1px solid var(--line); }
.mailbox-item:last-child { border-bottom: 0; }
.mailbox-item strong, .mailbox-item small { display: block; }
.mailbox-item strong { font-size: 13px; }
.mailbox-item small { color: var(--muted); margin-top: 3px; font-size: 11px; }
.mail-icon { width: 35px; height: 35px; border-radius: 10px; display: inline-grid; place-items: center; color: var(--primary); background: #eef3ff; font-weight: 900; }
.sync-dot { width: 9px; height: 9px; border-radius: 50%; }
.sync-dot.good { background: #1bb77a; box-shadow: 0 0 0 4px #e5f8f1; }
.sync-dot.bad { background: #d14956; box-shadow: 0 0 0 4px #ffedf0; }

.flash { border-radius: 12px; padding: 13px 15px; margin: 0 0 18px; font-size: 13px; font-weight: 650; border: 1px solid; }
.flash.success { color: #0a6848; background: #eaf8f2; border-color: #cceee0; }
.flash.error { color: #9d2d3a; background: #fff0f2; border-color: #ffd5db; }
.flash.warning { color: #81500d; background: #fff7e3; border-color: #f8e3ae; }

.filter-bar { display: grid; grid-template-columns: minmax(220px, 1fr) minmax(180px, .55fr) 150px auto; gap: 10px; padding: 18px; border-bottom: 1px solid var(--line); }
input, textarea, select { width: 100%; color: var(--text); background: #fff; border: 1px solid #d7deea; border-radius: 10px; padding: 11px 12px; outline: none; transition: border .15s, box-shadow .15s; }
input:focus, textarea:focus, select:focus { border-color: #6a8ffc; box-shadow: 0 0 0 4px rgba(63, 105, 231, .10); }
textarea { resize: vertical; line-height: 1.5; }
label { display: grid; gap: 7px; color: #3c475a; font-size: 12px; font-weight: 750; }
.form-stack { display: grid; gap: 16px; }
.card > .form-stack, .card form.form-stack { padding: 24px; }
.compact-form { gap: 12px; }
.compact-form input, .compact-form textarea, .compact-form select { padding: 9px 10px; }
.field-grid { display: grid; grid-template-columns: 1fr 1fr; gap: 12px; }
.form-actions { display: flex; gap: 10px; }
.checkbox { display: flex; align-items: center; gap: 9px; }
.checkbox input { width: auto; }

.pagination { display: flex; flex-wrap: wrap; gap: 6px; padding: 18px; border-top: 1px solid var(--line); }
.pagination a { min-width: 34px; height: 34px; display: grid; place-items: center; border-radius: 8px; border: 1px solid var(--line); color: var(--text); background: #fff; font-size: 12px; font-weight: 750; }
.pagination a.active { color: #fff; background: var(--primary); border-color: var(--primary); }
.empty-state { display: grid; gap: 5px; place-items: center; text-align: center; padding: 50px 20px; color: var(--muted); }
.empty-state strong { color: var(--text); }

.message-layout { display: grid; grid-template-columns: minmax(0, 1fr) 300px; gap: 20px; align-items: start; }
.conversation { display: grid; gap: 16px; }
.email-card { overflow: hidden; background: #fff; border: 1px solid var(--line); border-radius: var(--radius); box-shadow: var(--shadow); }
.email-card.outgoing { border-left: 4px solid var(--primary); }
.email-meta { display: grid; grid-template-columns: auto 1fr auto; align-items: center; gap: 12px; padding: 18px 20px; border-bottom: 1px solid var(--line); }
.email-meta strong, .email-meta small { display: block; }
.email-meta small { margin-top: 3px; color: var(--muted); font-size: 11px; }
.email-meta time { color: var(--muted); font-size: 11px; }
.email-frame { width: 100%; min-height: 320px; border: 0; background: #fff; }
.reply-card form { padding-top: 20px; }
.message-sidebar h2 { padding: 20px 20px 0; }
.sticky-card { position: sticky; top: 22px; }
.detail-list { margin: 0; padding: 0 20px 20px; }
.detail-list div { display: flex; justify-content: space-between; gap: 15px; padding: 12px 0; border-top: 1px solid var(--line); }
.detail-list dt { color: var(--muted); font-size: 11px; }
.detail-list dd { margin: 0; text-align: right; font-size: 11px; font-weight: 750; }

.signature-preview { border: 1px dashed #cdd7e8; border-radius: 12px; padding: 14px; background: #fbfcff; color: var(--text); font-size: 13px; }
.signature-preview > span { display: block; margin-bottom: 9px; color: var(--muted); font-size: 10px; font-weight: 800; text-transform: uppercase; letter-spacing: .08em; }
.signature-preview.standalone { min-height: 130px; margin: 18px 0; }
.compose-layout, .profile-layout { display: grid; grid-template-columns: minmax(0, 1fr) 330px; gap: 20px; align-items: start; }
.signature-side { padding: 22px; position: sticky; top: 22px; }
.help-box { display: flex; flex-wrap: wrap; align-items: center; gap: 8px; background: #f6f8fc; border: 1px solid var(--line); border-radius: 12px; padding: 13px; }
.help-box strong { width: 100%; font-size: 12px; }
.help-box code { background: #fff; border: 1px solid var(--line); border-radius: 6px; padding: 4px 7px; color: #384f8f; }
.help-box span { width: 100%; color: var(--muted); font-size: 11px; }

.admin-layout { display: grid; grid-template-columns: minmax(0, 1fr) 380px; gap: 20px; align-items: start; }
.admin-form-card { position: sticky; top: 22px; }
.admin-form-card h2 { padding: 20px 22px 0; }
.table-wrap { overflow-x: auto; }
table { width: 100%; border-collapse: collapse; }
th, td { padding: 14px 16px; text-align: left; border-bottom: 1px solid var(--line); font-size: 12px; }
th { color: var(--muted); background: #fafbfe; font-size: 10px; text-transform: uppercase; letter-spacing: .08em; }
.table-user { display: flex; gap: 10px; align-items: center; }
.table-user strong, .table-user small { display: block; }
.table-user small { color: var(--muted); margin-top: 2px; }
.form-section { display: grid; gap: 12px; padding-bottom: 15px; border-bottom: 1px solid var(--line); }
.form-section h3 { margin: 0; font-size: 12px; color: var(--primary); text-transform: uppercase; letter-spacing: .08em; }
.mailboxes-admin { grid-template-columns: minmax(0, 1fr) 440px; }
.mailbox-admin-list { padding: 8px 18px; }
.mailbox-admin-item { display: grid; grid-template-columns: auto minmax(0, 1fr) auto auto; gap: 14px; align-items: center; padding: 16px 4px; border-bottom: 1px solid var(--line); }
.mailbox-admin-item:last-child { border-bottom: 0; }
.mailbox-admin-item strong, .mailbox-admin-item small, .mailbox-admin-item span, .mailbox-admin-item em { display: block; }
.mailbox-admin-item small { color: var(--muted); margin-top: 2px; }
.mailbox-admin-item div > span { color: #9aa3b1; font-size: 10px; margin-top: 5px; }
.mailbox-admin-item em { color: var(--danger); font-size: 10px; margin-top: 5px; font-style: normal; max-width: 460px; white-space: nowrap; overflow: hidden; text-overflow: ellipsis; }
.row-actions { display: flex; gap: 10px; font-size: 11px; font-weight: 750; }

.login-page { min-height: 100vh; display: grid; grid-template-columns: minmax(420px, .85fr) minmax(460px, 1.15fr); }
.login-panel { display: flex; flex-direction: column; justify-content: center; max-width: 520px; width: 100%; margin: 0 auto; padding: 60px; }
.login-brand { display: flex; align-items: center; gap: 12px; margin-bottom: 52px; }
.login-panel h1 { margin: 0; font-size: 40px; letter-spacing: -.04em; }
.login-panel > p { color: var(--muted); margin: 9px 0 26px; }
.login-panel .form-stack { padding: 0; }
.login-note { margin-top: 24px; padding: 14px; border-radius: 12px; background: #eef3ff; color: #4662a1; font-size: 12px; }
.login-visual { display: grid; place-items: center; padding: 50px; background: radial-gradient(circle at 20% 20%, #3f69ff 0, transparent 35%), radial-gradient(circle at 80% 80%, #7439d9 0, transparent 33%), #111c32; }
.visual-card { width: min(610px, 100%); color: #fff; padding: 40px; border: 1px solid rgba(255,255,255,.15); background: rgba(10, 20, 39, .7); backdrop-filter: blur(18px); border-radius: 28px; box-shadow: 0 30px 80px rgba(0,0,0,.28); }
.visual-card .eyebrow { color: #a9bcff; }
.visual-card h2 { font-size: clamp(38px, 5vw, 64px); line-height: 1.02; letter-spacing: -.055em; margin: 15px 0 20px; }
.visual-card > p { max-width: 520px; color: #c4cde0; line-height: 1.7; }
.mini-inbox { margin-top: 34px; display: grid; gap: 10px; }
.mini-inbox div { display: grid; grid-template-columns: auto 115px 1fr; align-items: center; gap: 11px; padding: 14px 16px; border-radius: 13px; background: rgba(255,255,255,.07); border: 1px solid rgba(255,255,255,.09); }
.mini-inbox small { color: #aeb9cc; }
.dot { width: 9px; height: 9px; border-radius: 50%; }
.dot.blue { background: #55a2ff; }.dot.purple { background: #b66cff; }.dot.green { background: #4ed6a2; }

@media (max-width: 1100px) {
  .stat-grid { grid-template-columns: repeat(2, 1fr); }
  .content-grid, .message-layout, .compose-layout, .profile-layout, .admin-layout, .mailboxes-admin { grid-template-columns: 1fr; }
  .sticky-card, .signature-side, .admin-form-card { position: static; }
  .message-row { grid-template-columns: auto minmax(0, 1fr) auto; }
  .message-row .mailbox-pill { display: none; }
  .message-row time { grid-column: 3; }
  .message-row .status { grid-column: 3; }
}

@media (max-width: 780px) {
  .app-shell { grid-template-columns: 1fr; }
  .sidebar { position: static; height: auto; padding: 16px; }
  .sidebar nav { grid-template-columns: repeat(2, 1fr); }
  .nav-label { grid-column: 1 / -1; }
  .sidebar-user { margin-top: 18px; }
  .main { padding: 24px 16px 40px; }
  .page-header { flex-direction: column; }
  .filter-bar, .field-grid { grid-template-columns: 1fr; }
  .message-row { padding: 14px 12px; }
  .message-row .avatar, .message-row .status, .message-row time { display: none; }
  .message-row { grid-template-columns: 1fr; }
  .email-meta { grid-template-columns: auto 1fr; }
  .email-meta time { grid-column: 2; }
  .login-page { grid-template-columns: 1fr; }
  .login-panel { padding: 36px 24px; }
  .login-visual { display: none; }
  .stat-grid { grid-template-columns: 1fr; }
  .mailbox-admin-item { grid-template-columns: auto 1fr; }
  .mailbox-admin-item > .status, .mailbox-admin-item > .row-actions { grid-column: 2; }
}