:root {
  --bg: #f7f7f9;
  --panel: #ffffff;
  --border: #e4e6eb;
  --text: #1f2328;
  --muted: #6b7280;
  --accent: #4f46e5;
  --accent-fg: #ffffff;
  --hover: #f0f1f4;
  --danger: #dc2626;
}
[data-theme="dark"] {
  --bg: #0f1115;
  --panel: #161922;
  --border: #2a2f3a;
  --text: #e7eaf0;
  --muted: #8b93a3;
  --accent: #6366f1;
  --accent-fg: #ffffff;
  --hover: #1f2330;
  --danger: #ef4444;
}

* { box-sizing: border-box; }
html, body { margin: 0; height: 100%; }
body {
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
  background: var(--bg);
  color: var(--text);
  font-size: 14px;
}
.hidden { display: none !important; }
.muted { color: var(--muted); }
.small { font-size: 12px; }
.spacer { flex: 1; }
.error { color: var(--danger); margin-top: 8px; min-height: 1em; }
button {
  background: var(--panel);
  border: 1px solid var(--border);
  color: var(--text);
  padding: 6px 12px;
  border-radius: 6px;
  cursor: pointer;
}
button:hover { background: var(--hover); }
button.primary { background: var(--accent); color: var(--accent-fg); border-color: var(--accent); }
button.primary:hover { filter: brightness(1.05); }
button.link {
  background: transparent; border: 0; color: var(--accent); padding: 4px 0; text-align: left; cursor: pointer;
}
input, select, textarea {
  background: var(--panel); color: var(--text); border: 1px solid var(--border); border-radius: 6px;
  padding: 6px 10px; width: 100%; font: inherit;
}
textarea { resize: vertical; }
fieldset { border: 1px solid var(--border); border-radius: 6px; padding: 10px; margin: 8px 0; }
legend { padding: 0 6px; color: var(--muted); }
hr { border: 0; border-top: 1px solid var(--border); margin: 12px 0; }

/* AUTH */
.auth-wrap { min-height: 100vh; display: flex; align-items: center; justify-content: center; }
.auth-card { background: var(--panel); border: 1px solid var(--border); padding: 24px; border-radius: 12px; width: min(420px, 92vw); }
.auth-card h1 { margin: 0 0 4px; }
.auth-form { display: flex; flex-direction: column; gap: 10px; margin-top: 16px; }
.tabs { display: flex; gap: 6px; margin-top: 16px; }
.tab { flex: 1; }
.tab.active { background: var(--accent); color: var(--accent-fg); border-color: var(--accent); }

/* APP */
.app { display: grid; grid-template-columns: 260px 1fr; height: 100vh; }
.sidebar { background: var(--panel); border-right: 1px solid var(--border); display: flex; flex-direction: column; padding: 12px; gap: 12px; overflow-y: auto; }
.brand { display: flex; justify-content: space-between; align-items: center; }
.brand button { padding: 4px 8px; }
.section label { font-size: 11px; text-transform: uppercase; color: var(--muted); display: block; margin-bottom: 4px; }
.section button.link { display: block; }
.folders { display: flex; flex-direction: column; gap: 2px; max-height: 40vh; overflow-y: auto; }
.folder { padding: 6px 8px; border-radius: 6px; cursor: pointer; display: flex; justify-content: space-between; }
.folder:hover { background: var(--hover); }
.folder.active { background: var(--accent); color: var(--accent-fg); }
.folder .count { font-size: 11px; opacity: 0.85; }
.bottom { margin-top: auto; padding-top: 12px; border-top: 1px solid var(--border); display: flex; justify-content: space-between; align-items: center; }

.main { display: flex; flex-direction: column; min-width: 0; }
.toolbar { display: flex; gap: 8px; padding: 10px; border-bottom: 1px solid var(--border); align-items: center; }
.toolbar input { flex: 1; max-width: 480px; }
.split { display: grid; grid-template-columns: 360px 1fr; flex: 1; min-height: 0; }
.message-list { border-right: 1px solid var(--border); overflow-y: auto; }
.msg-row { padding: 10px 12px; border-bottom: 1px solid var(--border); cursor: pointer; }
.msg-row:hover { background: var(--hover); }
.msg-row.active { background: var(--accent); color: var(--accent-fg); }
.msg-row.unseen .from, .msg-row.unseen .subj { font-weight: 600; }
.msg-row .meta { display: flex; justify-content: space-between; font-size: 12px; }
.msg-row .subj { margin: 2px 0; }
.msg-row .snippet { font-size: 12px; color: var(--muted); white-space: nowrap; overflow: hidden; text-overflow: ellipsis; }
.msg-row.active .snippet, .msg-row.active .meta { color: rgba(255,255,255,.85); }

.message-view { padding: 16px; overflow-y: auto; }
.placeholder { color: var(--muted); display: flex; height: 100%; align-items: center; justify-content: center; }
.msg-head { border-bottom: 1px solid var(--border); padding-bottom: 10px; margin-bottom: 10px; }
.msg-head h2 { margin: 0 0 6px; font-size: 18px; }
.msg-head .row { display: flex; justify-content: space-between; gap: 8px; font-size: 13px; color: var(--muted); }
.actions { display: flex; gap: 6px; margin: 8px 0; flex-wrap: wrap; }
.msg-body { line-height: 1.5; }
.msg-body iframe { width: 100%; min-height: 60vh; border: 0; background: #fff; border-radius: 6px; }
.attachments { margin-top: 14px; display: flex; flex-wrap: wrap; gap: 8px; }
.att { border: 1px solid var(--border); padding: 6px 10px; border-radius: 6px; }
.att a { color: var(--accent); text-decoration: none; }

/* MODAL */
.modal { position: fixed; inset: 0; background: rgba(0,0,0,.4); display: flex; align-items: center; justify-content: center; z-index: 99; }
.modal-card { background: var(--panel); border: 1px solid var(--border); border-radius: 12px; width: min(560px, 96vw); max-height: 92vh; display: flex; flex-direction: column; }
.modal-card.large { width: min(760px, 96vw); }
.modal-card header, .modal-card footer { padding: 10px 14px; display: flex; align-items: center; gap: 8px; border-bottom: 1px solid var(--border); }
.modal-card footer { border-top: 1px solid var(--border); border-bottom: 0; }
.modal-card .modal-body { padding: 14px; overflow-y: auto; }
.close { background: transparent; border: 0; font-size: 22px; cursor: pointer; color: var(--muted); }
.row { display: grid; grid-template-columns: 90px 1fr; gap: 8px; align-items: center; margin-bottom: 8px; }
.grid { display: grid; grid-template-columns: 1fr 90px auto; gap: 6px; margin-bottom: 6px; }
.check { display: flex; gap: 6px; align-items: center; }

.acc-item { display: flex; justify-content: space-between; align-items: center; padding: 6px 0; border-bottom: 1px solid var(--border); }
.acc-item:last-child { border-bottom: 0; }

table.list { width: 100%; border-collapse: collapse; }
table.list th, table.list td { border-bottom: 1px solid var(--border); padding: 6px 4px; text-align: left; font-size: 13px; }
table.list th { color: var(--muted); font-weight: 500; }

@media (max-width: 900px) {
  .app { grid-template-columns: 1fr; }
  .sidebar { display: none; }
  .split { grid-template-columns: 1fr; }
}