:root {
  --bg: #f4f6fa; --panel: #fff; --text: #1f2328; --muted: #6b7280; --line: #e5e7eb;
  --primary: #1d4ed8; --primary-h: #1e40af; --primary-soft: #e8efff;
  --danger: #c62828; --ok: #1b7f3b; --unread: #0f172a; --radius: 10px;
  --shadow: 0 1px 2px rgba(16,24,40,.06), 0 1px 3px rgba(16,24,40,.08);
  --font: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;
}
@media (prefers-color-scheme: dark) {
  :root { --bg: #0f1115; --panel: #171a21; --text: #e6e8ec; --muted: #9aa3b2; --line: #2a2f3a;
    --primary: #4f7dff; --primary-h: #6b93ff; --primary-soft: #1d2740; --unread: #fff; }
  .body-frame { background: #fff; }
}
* { box-sizing: border-box; }
html, body { margin: 0; height: 100%; }
body { font: 14px/1.5 var(--font); color: var(--text); background: var(--bg); }
a { color: var(--primary); text-decoration: none; }
a:hover { text-decoration: underline; }
code { font: 13px/1.4 ui-monospace, SFMono-Regular, Menlo, Consolas, monospace; background: var(--primary-soft); padding: 1px 6px; border-radius: 5px; }
code.wrap { word-break: break-all; display: inline-block; }
h1, h2, h3 { margin: 0 0 12px; line-height: 1.25; }
h2 { font-size: 18px; } h3 { font-size: 15px; }
.muted { color: var(--muted); } .small { font-size: 12.5px; } .center { text-align: center; } .right { text-align: right; }
.hidden { display: none !important; }
.ic { width: 20px; height: 20px; flex: none; } .ic-sm { width: 16px; height: 16px; vertical-align: -3px; flex: none; }

/* inputs & buttons */
input, select, textarea { font: inherit; color: inherit; background: var(--panel); border: 1px solid var(--line);
  border-radius: 8px; padding: 9px 11px; width: 100%; outline: none; }
input:focus, select:focus, textarea:focus { border-color: var(--primary); box-shadow: 0 0 0 3px var(--primary-soft); }
input[type=checkbox] { width: 16px; height: 16px; padding: 0; accent-color: var(--primary); }
input:disabled { opacity: .75; }
.btn { display: inline-flex; align-items: center; justify-content: center; gap: 6px; padding: 8px 14px; border-radius: 8px;
  border: 1px solid var(--line); background: var(--panel); color: var(--text); font: inherit; font-weight: 500;
  cursor: pointer; white-space: nowrap; text-decoration: none !important; }
.btn:hover { background: var(--bg); }
.btn-primary { background: var(--primary); border-color: var(--primary); color: #fff; }
.btn-primary:hover { background: var(--primary-h); }
.btn-danger { color: var(--danger); }
.btn-danger:hover { background: #fdecec; }
.btn-ghost { border-color: transparent; background: transparent; }
.btn-small { padding: 5px 10px; font-size: 13px; }
.btn-block { width: 100%; }
.icon-btn { display: inline-flex; padding: 7px; border-radius: 8px; border: 0; background: transparent; color: var(--text); cursor: pointer; }
.icon-btn:hover { background: var(--primary-soft); }
.link-btn { border: 0; background: none; color: var(--primary); cursor: pointer; font: inherit; padding: 4px 6px; white-space: nowrap; }
.select-small { width: auto; padding: 5px 8px; font-size: 13px; }
.check { display: inline-flex; align-items: center; gap: 8px; cursor: pointer; }
.field { display: block; margin-bottom: 14px; }
.field > span { display: block; font-weight: 500; margin-bottom: 5px; font-size: 13px; }
.addon-input { display: flex; }
.addon-input input { border-radius: 8px 0 0 8px; }
.addon { display: flex; align-items: center; padding: 0 12px; border: 1px solid var(--line); border-left: 0;
  border-radius: 0 8px 8px 0; background: var(--bg); color: var(--muted); white-space: nowrap; }
.flashes { margin-bottom: 12px; display: grid; gap: 6px; }
.flash { padding: 10px 14px; border-radius: 8px; background: var(--primary-soft); }
.flash-error { background: #fdecec; color: #8a1c1c; } .flash-ok { background: #e7f6ec; color: #155d2c; }
@media (prefers-color-scheme: dark) { .flash-error { background: #3a1c1c; color: #ffb4b4; } .flash-ok { background: #16301f; color: #9be3b0; } .btn-danger:hover { background: #3a1c1c; } }

/* auth */
body.auth { display: flex; align-items: center; justify-content: center; padding: 20px; min-height: 100%;
  background: radial-gradient(circle at 20% 0%, var(--primary-soft), var(--bg) 60%); }
.auth-card { width: 100%; max-width: 400px; background: var(--panel); padding: 30px 28px; border-radius: 16px; box-shadow: 0 10px 40px rgba(16,24,40,.12); }
.auth-card h1 { font-size: 22px; margin: 18px 0 18px; }
.auth-card .check { margin: 2px 0 18px; }
.brand { display: inline-flex; align-items: center; gap: 8px; color: var(--text); font-size: 16px; text-decoration: none !important; }
.brand-ic { width: 26px; height: 26px; color: var(--primary); }

/* app layout */
body.app { display: flex; flex-direction: column; height: 100vh; height: 100dvh; overflow: hidden; }
.topbar { display: flex; align-items: center; gap: 12px; padding: 8px 16px; background: var(--panel); border-bottom: 1px solid var(--line); flex: none; }
.search { flex: 1; max-width: 640px; position: relative; display: flex; align-items: center; }
.search .ic { position: absolute; left: 10px; color: var(--muted); width: 18px; }
.search input { padding-left: 36px; background: var(--bg); border-color: transparent; }
.user-menu { margin-left: auto; display: flex; align-items: center; gap: 4px; }
.user-menu form { margin: 0; }
.user-email { color: var(--muted); margin-right: 6px; }
.layout { display: flex; flex: 1; min-height: 0; }
.sidebar { width: 240px; flex: none; padding: 14px 10px; overflow-y: auto; background: var(--bg); }
.compose-btn { margin-bottom: 14px; padding: 11px; border-radius: 12px; }
.folders { display: grid; gap: 2px; }
.folder { display: flex; align-items: center; gap: 10px; padding: 8px 12px; border-radius: 8px; color: var(--text); text-decoration: none !important; }
.folder:hover { background: var(--primary-soft); }
.folder.active { background: var(--primary-soft); color: var(--primary); font-weight: 600; }
.folder-title { flex: 1; overflow: hidden; text-overflow: ellipsis; white-space: nowrap; }
.badge { background: var(--primary); color: #fff; font-size: 11.5px; font-weight: 600; border-radius: 10px; padding: 0 7px; min-width: 20px; text-align: center; }
.count { color: var(--muted); font-size: 12px; }
.new-folder { margin-top: 14px; padding: 0 12px; color: var(--muted); }
.new-folder summary { cursor: pointer; font-size: 13px; }
.new-folder form { display: grid; gap: 6px; margin-top: 8px; }
.content { flex: 1; min-width: 0; overflow-y: auto; padding: 14px 18px 30px; background: var(--panel); border-radius: 14px 0 0 0; border-left: 1px solid var(--line); }
.sidebar-backdrop { display: none; }

/* message list */
.toolbar { display: flex; align-items: center; gap: 12px; padding: 4px 0 10px; border-bottom: 1px solid var(--line); flex-wrap: wrap; position: sticky; top: -14px; background: var(--panel); z-index: 2; }
.folder-heading { margin: 0; font-size: 18px; flex: 1; min-width: 120px; }
.actions { display: flex; gap: 6px; flex-wrap: wrap; align-items: center; }
.actions[data-disabled] { opacity: .45; pointer-events: none; }
.msg-list { list-style: none; margin: 0; padding: 0; }
.msg { display: flex; align-items: center; gap: 10px; border-bottom: 1px solid var(--line); padding-left: 4px; }
.msg:hover { background: var(--bg); }
.msg .check { padding: 12px 2px; }
.msg-link { flex: 1; min-width: 0; display: grid; grid-template-columns: 220px 1fr auto; gap: 14px; align-items: center;
  padding: 11px 8px 11px 0; color: var(--text); text-decoration: none !important; }
.msg-from, .msg-subject { overflow: hidden; text-overflow: ellipsis; white-space: nowrap; }
.msg-meta { display: flex; align-items: center; gap: 6px; color: var(--muted); font-size: 12.5px; white-space: nowrap; }
.msg.unread .msg-from, .msg.unread .msg-subject { font-weight: 700; color: var(--unread); }
.msg.unread { box-shadow: inset 3px 0 0 var(--primary); }
.flag { color: #e0a100; }
.empty { padding: 60px 0; text-align: center; color: var(--muted); }
.list-footer { display: flex; align-items: center; gap: 14px; padding: 12px 0; flex-wrap: wrap; }
.pager { display: flex; align-items: center; gap: 10px; }
.folder-tools { margin-left: auto; } .folder-tools form { margin: 0; }

/* view */
.view-toolbar { display: flex; gap: 6px; flex-wrap: wrap; align-items: center; padding-bottom: 12px; border-bottom: 1px solid var(--line); }
.inline-form { display: contents; }
.message { max-width: 980px; padding-top: 16px; }
.subject { font-size: 21px; word-wrap: break-word; }
.headers { display: grid; gap: 3px; padding: 12px 14px; background: var(--bg); border-radius: var(--radius); margin-bottom: 14px; word-break: break-word; }
.h-label { display: inline-block; min-width: 70px; color: var(--muted); }
.notice { padding: 8px 12px; background: #fff7e0; color: #6a5200; border-radius: 8px; margin-bottom: 10px; font-size: 13px; }
@media (prefers-color-scheme: dark) { .notice { background: #3a3116; color: #f3d98c; } }
.body-frame { width: 100%; min-height: 160px; border: 0; display: block; border-radius: 6px; }
.attachments { margin-top: 18px; padding-top: 12px; border-top: 1px solid var(--line); }
.attachments ul { list-style: none; padding: 0; margin: 0; display: grid; gap: 6px; }
.attachments li { display: flex; gap: 10px; align-items: center; flex-wrap: wrap; }

/* compose */
.compose { max-width: 900px; }
.compose .row { display: flex; align-items: center; gap: 10px; border-bottom: 1px solid var(--line); padding: 4px 0; }
.compose .row label { width: 70px; flex: none; color: var(--muted); }
.compose .row input, .compose .row select { border-color: transparent; padding: 8px 4px; }
.compose .row input:focus, .compose .row select:focus { box-shadow: none; border-color: transparent; }
.body-input { margin-top: 12px; min-height: 300px; resize: vertical; font: 14px/1.55 var(--font); }
.compose-actions { display: flex; gap: 8px; margin-top: 12px; flex-wrap: wrap; }
.file-btn { position: relative; overflow: hidden; }
.file-btn input { position: absolute; inset: 0; opacity: 0; cursor: pointer; }
.file-list { list-style: none; padding: 0; margin: 10px 0 0; color: var(--muted); }
.carried { margin-top: 10px; display: grid; gap: 4px; }

/* pages & cards */
.page { max-width: 820px; }
.card { background: var(--panel); border: 1px solid var(--line); border-radius: 12px; padding: 18px 20px; margin-bottom: 16px; box-shadow: var(--shadow); }
.form-inline { display: flex; gap: 8px; flex-wrap: wrap; }
.form-inline input { flex: 1; min-width: 200px; }
.form-grid { display: grid; gap: 0 16px; max-width: 460px; }
.form-grid.cols { grid-template-columns: repeat(auto-fit, minmax(220px, 1fr)); max-width: none; align-items: start; }
.form-end { grid-column: 1 / -1; }
.field-check { grid-column: 1 / -1; margin-bottom: 12px; }
.kv { border-collapse: collapse; }
.kv th { text-align: left; font-weight: 500; color: var(--muted); padding: 6px 18px 6px 0; vertical-align: top; white-space: nowrap; }
.kv td { padding: 6px 0; }

/* admin */
body.admin { min-height: 100%; }
.admin-nav { display: flex; gap: 4px; margin-left: 14px; }
.admin-nav a { display: flex; align-items: center; gap: 6px; padding: 7px 12px; border-radius: 8px; color: var(--text); text-decoration: none !important; }
.admin-nav a:hover { background: var(--bg); }
.admin-nav a.active { background: var(--primary-soft); color: var(--primary); font-weight: 600; }
.admin-main { max-width: 1100px; margin: 0 auto; padding: 20px 16px 40px; }
.table-wrap { overflow-x: auto; }
.table { width: 100%; border-collapse: collapse; }
.table th { text-align: left; color: var(--muted); font-weight: 500; font-size: 12.5px; padding: 8px 10px; border-bottom: 1px solid var(--line); }
.table td { padding: 10px; border-bottom: 1px solid var(--line); vertical-align: middle; }
.table td form { margin: 0; }
.table.dns td:first-child { font-weight: 600; }
.row-off td { opacity: .55; }
.pill { font-size: 12px; padding: 2px 8px; border-radius: 10px; background: var(--bg); color: var(--muted); }
.pill-ok { background: #e7f6ec; color: var(--ok); }
.created-box { background: #e7f6ec; border: 1px solid #b8e2c6; color: #14532d; padding: 14px 18px; border-radius: 12px; margin-bottom: 16px; display: grid; gap: 6px; }
.created-box code { background: #fff; font-size: 14px; cursor: pointer; }
.cred span { display: inline-block; min-width: 60px; }
@media (prefers-color-scheme: dark) { .created-box { background: #16301f; border-color: #24563a; color: #c6f1d3; } .created-box code { background: #0f1115; } .pill-ok { background: #16301f; } }
.danger-zone { border-color: #f1c4c4; }
[data-copy] { cursor: pointer; }
[data-copy].copied { outline: 2px solid var(--ok); }

.only-mobile { display: none; }
@media (max-width: 860px) {
  .only-mobile { display: inline-flex; } .hide-mobile { display: none !important; }
  .topbar { padding: 8px 10px; gap: 8px; }
  .sidebar { position: fixed; top: 0; bottom: 0; left: 0; z-index: 30; background: var(--panel); transform: translateX(-100%);
    transition: transform .2s; width: 270px; }
  body.sidebar-open .sidebar { transform: none; box-shadow: 0 0 30px rgba(0,0,0,.2); }
  body.sidebar-open .sidebar-backdrop { display: block; position: fixed; inset: 0; background: rgba(0,0,0,.3); z-index: 20; }
  .content { border-radius: 0; border-left: 0; padding: 10px 12px 30px; }
  .msg-link { grid-template-columns: 1fr auto; grid-template-areas: "from meta" "subj subj"; gap: 2px 10px; }
  .msg-from { grid-area: from; } .msg-subject { grid-area: subj; } .msg-meta { grid-area: meta; }
  .toolbar { top: -10px; }
  .admin-nav { margin-left: 0; } .admin-nav span { display: none; }
  .topbar .brand span { display: none; }
  .compose .row label { width: 56px; }
}