:root {
  --bg: #f4f6f9; --surface: #ffffff; --surface-2: #eef1f5; --border: #d9dee6; --text: #1f2933; --muted: #69768a;
  --primary: #2563eb; --primary-text: #fff; --danger: #dc2626; --ok: #16a34a; --warn: #d97706; --unread: #0f172a;
  --selected: #dbe7ff; --shadow: 0 1px 3px rgba(15, 23, 42, .12);
  color-scheme: light;
}
:root[data-theme="dark"] {
  --bg: #0f141b; --surface: #171e27; --surface-2: #1f2833; --border: #2c3744; --text: #e3e8ef; --muted: #8b98a9;
  --primary: #3b82f6; --selected: #1e3a5f; --unread: #ffffff; --shadow: 0 1px 3px rgba(0, 0, 0, .5);
  color-scheme: dark;
}
* { box-sizing: border-box; }
html, body { margin: 0; height: 100%; }
body { background: var(--bg); color: var(--text); font: 14px/1.45 system-ui, -apple-system, "Segoe UI", Roboto, sans-serif; }
.hidden { display: none !important; }
.muted { color: var(--muted); }
.error { color: var(--danger); min-height: 1.2em; }
.card { background: var(--surface); border: 1px solid var(--border); border-radius: 8px; box-shadow: var(--shadow); }
button, .btn { font: inherit; border: 1px solid var(--border); background: var(--surface); color: var(--text); border-radius: 6px; padding: 6px 12px; cursor: pointer; }
button:hover { background: var(--surface-2); }
button.primary { background: var(--primary); color: var(--primary-text); border-color: var(--primary); }
button.danger { color: var(--danger); }
button.ghost { border-color: transparent; background: transparent; }
button:disabled { opacity: .5; cursor: default; }
input, select, textarea { font: inherit; width: 100%; padding: 7px 9px; border: 1px solid var(--border); border-radius: 6px; background: var(--surface); color: var(--text); }
label { display: block; margin: 8px 0; font-weight: 500; }
label > input, label > select, label > textarea { margin-top: 4px; font-weight: 400; }
table { width: 100%; border-collapse: collapse; }
th, td { text-align: left; padding: 8px 10px; border-bottom: 1px solid var(--border); vertical-align: top; }
th { font-weight: 600; color: var(--muted); font-size: 12px; text-transform: uppercase; letter-spacing: .03em; }
code, .mono { font-family: ui-monospace, SFMono-Regular, Consolas, monospace; font-size: 12px; word-break: break-all; }
.badge { display: inline-block; padding: 1px 8px; border-radius: 10px; font-size: 12px; background: var(--surface-2); }
.badge.ok { background: rgba(22, 163, 74, .15); color: var(--ok); }
.badge.bad { background: rgba(220, 38, 38, .15); color: var(--danger); }
.badge.warn { background: rgba(217, 119, 6, .15); color: var(--warn); }

.login { display: grid; place-items: center; height: 100%; }
.login-card { width: 360px; padding: 28px; }
.login-card h1 { margin: 0 0 4px; }
.login-card button { width: 100%; margin-top: 12px; padding: 9px; }

.shell { display: flex; flex-direction: column; height: 100%; }
.topbar { display: flex; align-items: center; gap: 12px; padding: 8px 16px; background: var(--surface); border-bottom: 1px solid var(--border); }
.brand { font-weight: 700; font-size: 16px; }
.nav { display: flex; gap: 4px; flex-wrap: wrap; }
.nav a { padding: 6px 10px; border-radius: 6px; color: var(--text); text-decoration: none; }
.nav a.active { background: var(--selected); }
.spacer { flex: 1; }
.view { flex: 1; overflow: auto; }

/* ---------------- webmail ---------------- */
.webmail { display: grid; grid-template-columns: 220px 380px 1fr; height: 100%; }
.sidebar { border-right: 1px solid var(--border); padding: 12px; overflow: auto; background: var(--surface); }
.sidebar .compose { width: 100%; margin-bottom: 12px; padding: 9px; }
.folder { display: flex; justify-content: space-between; padding: 7px 10px; border-radius: 6px; cursor: pointer; }
.folder.active { background: var(--selected); font-weight: 600; }
.folder .count { color: var(--primary); font-weight: 600; }
.list { border-right: 1px solid var(--border); display: flex; flex-direction: column; overflow: hidden; }
.list-toolbar { padding: 8px; display: flex; gap: 6px; border-bottom: 1px solid var(--border); }
.list-items { overflow: auto; flex: 1; }
.item { padding: 10px 12px; border-bottom: 1px solid var(--border); cursor: pointer; }
.item:hover { background: var(--surface-2); }
.item.active { background: var(--selected); }
.item.unread .from, .item.unread .subject { font-weight: 700; color: var(--unread); }
.item .row { display: flex; justify-content: space-between; gap: 8px; }
.item .from { white-space: nowrap; overflow: hidden; text-overflow: ellipsis; }
.item .date { color: var(--muted); font-size: 12px; white-space: nowrap; }
.item .snippet { color: var(--muted); font-size: 13px; white-space: nowrap; overflow: hidden; text-overflow: ellipsis; }
.pager { padding: 8px; display: flex; justify-content: space-between; align-items: center; border-top: 1px solid var(--border); }
.reader { overflow: auto; padding: 16px 20px; }
.reader h2 { margin: 0 0 8px; }
.reader .meta { color: var(--muted); margin-bottom: 12px; }
.reader .actions { display: flex; gap: 6px; flex-wrap: wrap; margin: 10px 0; }
.reader iframe { width: 100%; min-height: 420px; border: 1px solid var(--border); border-radius: 6px; background: #fff; }
.reader pre { white-space: pre-wrap; font-family: inherit; }
.attachments { display: flex; flex-wrap: wrap; gap: 8px; margin: 10px 0; }
.attachment { padding: 6px 10px; border: 1px solid var(--border); border-radius: 6px; cursor: pointer; background: var(--surface-2); }
.thread-item { border: 1px solid var(--border); border-radius: 8px; margin: 8px 0; padding: 10px; background: var(--surface); }
.empty { padding: 40px; text-align: center; color: var(--muted); }

/* ---------------- admin ---------------- */
.page { padding: 20px; max-width: 1280px; margin: 0 auto; }
.page h2 { margin-top: 0; }
.toolbar { display: flex; gap: 8px; align-items: center; margin-bottom: 12px; flex-wrap: wrap; }
.toolbar input { width: 260px; }
.grid { display: grid; grid-template-columns: repeat(auto-fill, minmax(200px, 1fr)); gap: 12px; margin-bottom: 16px; }
.stat { padding: 14px; }
.stat .value { font-size: 24px; font-weight: 700; }
.panel { padding: 16px; margin-bottom: 16px; overflow-x: auto; }
.form-grid { display: grid; grid-template-columns: 1fr 1fr; gap: 0 16px; }
.bar { height: 8px; background: var(--surface-2); border-radius: 4px; overflow: hidden; min-width: 80px; }
.bar > span { display: block; height: 100%; background: var(--primary); }

.modal { position: fixed; inset: 0; background: rgba(0, 0, 0, .45); display: grid; place-items: center; z-index: 10; }
.modal-body { width: min(820px, 94vw); max-height: 92vh; overflow: auto; padding: 20px; }
.modal-body h3 { margin-top: 0; }
.modal-actions { display: flex; justify-content: flex-end; gap: 8px; margin-top: 12px; }
.editor { min-height: 240px; border: 1px solid var(--border); border-radius: 6px; padding: 10px; background: var(--surface); overflow: auto; }
.editor-wrap { margin: 8px 0; }
.editor-wrap .editor { border-top-left-radius: 0; border-top-right-radius: 0; }
.editor-toolbar { display: flex; flex-wrap: wrap; align-items: center; gap: 4px; padding: 4px; border: 1px solid var(--border); border-bottom: 0; border-radius: 6px 6px 0 0; background: var(--surface-2); }
.editor-toolbar button { padding: 3px 9px; min-width: 32px; }
.editor-toolbar button.active { background: var(--selected); border-color: var(--primary); }
.editor-toolbar .spacer { flex: 1; }
.editor-toolbar label.color { display: inline-flex; align-items: center; gap: 2px; margin: 0; padding: 0 6px; font-weight: 700; color: #c00000; cursor: pointer; }
.editor-toolbar label.color input { width: 22px; height: 22px; padding: 0; border: 0; margin: 0; background: none; cursor: pointer; }
.editor-toolbar .disabled { opacity: .4; pointer-events: none; }
.editor-source { display: grid; grid-template-columns: 1fr 1fr; gap: 8px; border: 1px solid var(--border); border-radius: 0 0 6px 6px; padding: 8px; background: var(--surface); }
.editor-source textarea { font-size: 12.5px; resize: vertical; word-break: normal; }
.editor-source iframe { width: 100%; border: 1px solid var(--border); border-radius: 6px; background: #fff; }
.upload-list div { font-size: 13px; margin: 3px 0; }
.toast { position: fixed; bottom: 20px; right: 20px; padding: 10px 16px; border-radius: 6px; background: #111827; color: #fff; z-index: 20; max-width: 420px; }
.toast.error { background: var(--danger); }
.viewer img, .viewer iframe { max-width: 100%; width: 100%; min-height: 70vh; border: 0; }

@media (max-width: 1000px) {
  .webmail { grid-template-columns: 1fr; }
  .sidebar, .list { border-right: 0; border-bottom: 1px solid var(--border); max-height: 40vh; }
  .form-grid, .editor-source { grid-template-columns: 1fr; }
}