:root {
    --bg: #f5f6f8; --card: #fff; --text: #1d2330; --muted: #6b7280; --line: #e3e6eb;
    --accent: #1a73e8; --accent-text: #fff; --hover: #f0f4fb; --active: #e3edfd;
}
@media (prefers-color-scheme: dark) {
    :root {
        --bg: #14171c; --card: #1d2128; --text: #e6e8eb; --muted: #9aa1ab; --line: #2d323b;
        --accent: #6aa6ff; --accent-text: #0b1220; --hover: #252a33; --active: #23324a;
    }
}
* { box-sizing: border-box; }
body { margin: 0; font: 14px/1.45 system-ui, -apple-system, "Segoe UI", Roboto, sans-serif; background: var(--bg); color: var(--text); }
a { color: var(--accent); text-decoration: none; }
code { background: var(--hover); padding: 1px 4px; border-radius: 4px; }
.muted { color: var(--muted); }
.small { font-size: 12px; }

.topbar { display: flex; justify-content: space-between; align-items: center; padding: 10px 16px; background: var(--card); border-bottom: 1px solid var(--line); }
.topbar form { display: flex; gap: 8px; align-items: center; margin: 0; }
.brand { font-weight: 600; font-size: 16px; color: var(--text); }

.container { max-width: 1000px; margin: 16px auto; padding: 0 16px; }
.layout { display: grid; grid-template-columns: 260px minmax(0, 1fr); gap: 16px; padding: 16px; }
@media (max-width: 760px) { .layout { grid-template-columns: 1fr; } }

.card { background: var(--card); border: 1px solid var(--line); border-radius: 8px; }
.btn { display: inline-block; padding: 6px 12px; border: 1px solid var(--line); border-radius: 6px; background: var(--card); color: var(--text); cursor: pointer; font: inherit; }
.btn:hover { background: var(--hover); }
.btn-primary { background: var(--accent); border-color: var(--accent); color: var(--accent-text); }
.btn-primary:hover { background: var(--accent); opacity: .9; }
.btn-link { border: 0; background: none; color: var(--accent); padding: 0; }
.btn.disabled { opacity: .5; cursor: default; }
input[type=text], input[type=email], input[type=password], input[type=search], input[type=date] {
    width: 100%; padding: 7px 10px; border: 1px solid var(--line); border-radius: 6px; background: var(--card); color: var(--text); font: inherit;
}
label { display: block; font-size: 12px; color: var(--muted); }
label.check { display: flex; gap: 6px; align-items: center; color: var(--text); font-size: 14px; }

.sidebar { display: flex; flex-direction: column; gap: 2px; }
.nav-group { margin-top: 10px; }
.nav-item { display: flex; justify-content: space-between; padding: 5px 10px; border-radius: 6px; color: var(--text); overflow-wrap: anywhere; }
.nav-item:hover { background: var(--hover); }
.nav-item.active { background: var(--active); font-weight: 600; }
.nav-mailbox { font-weight: 600; }
.nav-folder { padding-left: 22px; }
.count { color: var(--muted); font-size: 12px; font-weight: normal; }

.search { padding: 12px; display: grid; gap: 10px; margin-bottom: 8px; }
.search summary { cursor: pointer; color: var(--muted); }
.filters { display: grid; grid-template-columns: repeat(auto-fit, minmax(160px, 1fr)); gap: 10px; margin-top: 8px; align-items: end; }
.search-actions { display: flex; gap: 8px; }

.list .row { display: grid; grid-template-columns: 220px minmax(0, 1fr) auto; gap: 12px; padding: 9px 12px; border-bottom: 1px solid var(--line); color: var(--text); }
.list .row:last-child { border-bottom: 0; }
.list .row:hover { background: var(--hover); }
.row-from, .row-main { white-space: nowrap; overflow: hidden; text-overflow: ellipsis; }
.row-from { font-weight: 600; }
.row-subject { font-weight: 500; }
.row-meta { white-space: nowrap; color: var(--muted); font-size: 12px; display: flex; gap: 6px; }
.tag { display: inline-block; font-size: 11px; font-weight: normal; color: var(--muted); border: 1px solid var(--line); border-radius: 4px; padding: 0 4px; margin-left: 4px; }
@media (max-width: 760px) { .list .row { grid-template-columns: 1fr; gap: 2px; } }
.empty { padding: 24px; text-align: center; }
.pagination { display: flex; gap: 12px; align-items: center; justify-content: center; margin: 16px 0; }

.message { padding: 20px; }
.message h1 { font-size: 20px; margin: 0 0 12px; overflow-wrap: anywhere; }
.headers { display: grid; grid-template-columns: max-content 1fr; gap: 4px 12px; margin: 0 0 12px; }
.headers dt { color: var(--muted); }
.headers dd { margin: 0; overflow-wrap: anywhere; }
.actions { display: flex; gap: 8px; flex-wrap: wrap; margin-bottom: 12px; }
.attachments { border-top: 1px solid var(--line); padding: 10px 0; }
.attachments ul { list-style: none; padding: 0; margin: 6px 0 0; display: grid; gap: 4px; }
.body { border-top: 1px solid var(--line); padding-top: 12px; }
.body iframe { width: 100%; height: 75vh; min-height: 300px; border: 1px solid var(--line); border-radius: 6px; background: #fff; resize: vertical; }
.text-body { white-space: pre-wrap; overflow-wrap: anywhere; font: 14px/1.5 ui-monospace, Menlo, Consolas, monospace; margin: 0; }

.login-wrap { min-height: 100vh; display: grid; place-items: center; padding: 16px; }
.login-card { width: 100%; max-width: 360px; padding: 24px; display: grid; gap: 12px; }
.login-card h1 { margin: 0; font-size: 22px; }
.login-card p { margin: 0; }
.alert { background: #fde8e8; color: #9b1c1c; padding: 8px 10px; border-radius: 6px; }