:root {
  --bg: #f7f9fb;
  --sidebar: #101820;
  --panel: #ffffff;
  --text: #17202a;
  --muted: #647386;
  --line: #d9e1e8;
  --accent: #2f8d68;
  --accent-2: #d8a43d;
  --danger: #b83b3b;
}

* { box-sizing: border-box; }
body {
  margin: 0;
  font-family: "Segoe UI", Arial, sans-serif;
  color: var(--text);
  background: var(--bg);
}

.shell {
  min-height: 100vh;
  display: grid;
  grid-template-columns: 280px 1fr;
}

.sidebar {
  background: var(--sidebar);
  color: #edf4f8;
  padding: 24px;
  display: flex;
  flex-direction: column;
  gap: 22px;
}

.brand { display: flex; align-items: center; gap: 12px; }
.brand strong { display: block; font-size: 20px; }
.brand span { color: #9fb0bf; font-size: 13px; }
.moon {
  width: 46px;
  height: 46px;
  border-radius: 10px;
  background:
    radial-gradient(circle at 58% 39%, var(--sidebar) 0 29%, transparent 30%),
    radial-gradient(circle at 44% 50%, #f1c95c 0 34%, transparent 35%),
    #16232d;
  border: 1px solid #344453;
}

nav { display: grid; gap: 8px; }
button {
  border: 1px solid var(--line);
  background: var(--panel);
  color: var(--text);
  border-radius: 7px;
  padding: 10px 12px;
  font-weight: 600;
  cursor: pointer;
}
.sidebar button {
  background: transparent;
  color: #edf4f8;
  border-color: #2d3a47;
  text-align: left;
}
button.active, button:hover { border-color: var(--accent); }
.hint { color: #9fb0bf; font-size: 13px; line-height: 1.45; margin-top: auto; }

main { padding: 24px; min-width: 0; }
.toolbar {
  display: flex;
  gap: 10px;
  margin-bottom: 16px;
}
input, select, textarea {
  width: 100%;
  border: 1px solid var(--line);
  border-radius: 7px;
  padding: 10px 12px;
  font: inherit;
  background: #fff;
}
textarea { resize: vertical; }

.view { display: none; }
.view.active { display: block; }
.panel, .ref {
  background: var(--panel);
  border: 1px solid var(--line);
  border-radius: 8px;
  padding: 18px;
  margin-bottom: 14px;
}
h1, h2 { margin: 0 0 14px; letter-spacing: 0; }
h1 { font-size: 24px; }
h2 { font-size: 18px; }
.refs { display: grid; gap: 10px; }
.ref h3 { margin: 0 0 6px; font-size: 17px; }
.meta { color: var(--muted); font-size: 13px; margin-bottom: 8px; }
.apa { background: #f3f6f8; border-radius: 6px; padding: 10px; font-size: 13px; }
.row { display: flex; gap: 8px; flex-wrap: wrap; margin-top: 10px; }
.row button.delete { color: var(--danger); border-color: #ecc7c7; }
.inline { display: flex; gap: 10px; }
.inline input { flex: 1; }
.form { display: grid; gap: 10px; }
.grid { display: grid; grid-template-columns: 1fr 1fr; gap: 10px; }
label { display: grid; gap: 5px; color: var(--muted); font-size: 13px; }
.status { min-height: 20px; color: var(--accent); }
.actions { display: flex; gap: 10px; margin-bottom: 12px; flex-wrap: wrap; }

@media (max-width: 820px) {
  .shell { grid-template-columns: 1fr; }
  .sidebar { min-height: auto; }
  .inline, .toolbar, .grid { grid-template-columns: 1fr; display: grid; }
}