:root {
  --bg-color: #FFFFFF;
  --bg-color-border: #DDDDCC;
  --color-def-font: #0D151C;
  --color-f: #19A9AB;
  --color-f-dark: #106F71;
  --color-f-light: #A4DCDD;
  --color-f-shadow: #19A9AB42;

  /* Semantic aliases used across the app */
  --bg: var(--bg-color);
  --surface: #FFFFFF;
  --border: var(--bg-color-border);
  --text: var(--color-def-font);
  --text-muted: #5B6660;
  --accent: var(--color-f);
  --accent-dark: var(--color-f-dark);
  --accent-soft: var(--color-f-light);
  --warn: #C97A3D;
  --danger: #B3432B;
  --radius: 6px;
  --font-body: "Inter", -apple-system, "Segoe UI", sans-serif;
  --font-mono: "IBM Plex Mono", "SFMono-Regular", Consolas, monospace;
}

* { box-sizing: border-box; }

body {
  background: var(--bg);
  color: var(--text);
  font-family: var(--font-body);
  font-size: 15px;
  line-height: 1.5;
  margin: 0;
}

a { color: var(--accent-dark); text-decoration: none; }
a:hover { text-decoration: underline; }

.app-shell { display: flex; min-height: 100vh; }

.sidebar {
  width: 220px;
  flex-shrink: 0;
  background: var(--accent-dark);
  color: #EAF3F3;
  padding: 24px 0;
}

.sidebar .brand {
  font-weight: 700;
  font-size: 17px;
  letter-spacing: 0.02em;
  padding: 0 20px 20px;
  border-bottom: 1px solid rgba(255,255,255,0.12);
  margin-bottom: 12px;
}

.sidebar nav a {
  display: block;
  color: #CFE4E4;
  padding: 9px 20px;
  font-size: 14px;
}

.sidebar nav a:hover, .sidebar nav a.active {
  background: rgba(255,255,255,0.08);
  color: #fff;
  text-decoration: none;
}

.main {
  flex: 1;
  padding: 28px 36px;
  max-width: 1180px;
}

.page-header {
  display: flex;
  justify-content: space-between;
  align-items: baseline;
  margin-bottom: 20px;
  flex-wrap: wrap;
  gap: 8px;
}

.page-header h1 { font-size: 22px; margin: 0; }
.page-header .subtitle { color: var(--text-muted); font-size: 14px; }

.card {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 20px;
  margin-bottom: 20px;
}

.btn {
  display: inline-block;
  padding: 8px 16px;
  border-radius: var(--radius);
  border: 1px solid var(--accent);
  background: var(--accent);
  color: #fff;
  font-size: 14px;
  cursor: pointer;
}

.btn:hover { background: var(--accent-dark); border-color: var(--accent-dark); color: #fff; text-decoration: none; }
.btn-outline { background: transparent; color: var(--accent-dark); }
.btn-outline:hover { background: var(--accent-soft); color: var(--accent-dark); }
.btn-danger { background: var(--danger); border-color: var(--danger); }
.btn-danger:hover { background: #8f331f; border-color: #8f331f; }
.btn-sm { padding: 4px 10px; font-size: 13px; }

table { width: 100%; border-collapse: collapse; }
th, td { text-align: left; padding: 8px 10px; border-bottom: 1px solid var(--border); font-size: 14px; }
th { color: var(--text-muted); font-weight: 600; font-size: 12px; text-transform: uppercase; letter-spacing: 0.04em; }

.badge {
  display: inline-block;
  padding: 2px 9px;
  border-radius: 20px;
  font-size: 12px;
  font-weight: 600;
  background: var(--accent-soft);
  color: var(--accent-dark);
}
.badge-warn { background: #F7E9DC; color: var(--warn); }
.badge-muted { background: #ECEDEC; color: var(--text-muted); }

.lang-tabs { display: flex; gap: 4px; border-bottom: 1px solid var(--border); margin-bottom: 16px; }
.lang-tabs button {
  border: none; background: transparent; padding: 8px 14px; cursor: pointer;
  font-size: 13px; font-weight: 600; color: var(--text-muted); border-bottom: 2px solid transparent;
}
.lang-tabs button.active { color: var(--accent-dark); border-color: var(--accent); }
.lang-pane { display: none; }
.lang-pane.active { display: block; }

label { display: block; font-size: 13px; font-weight: 600; margin-bottom: 4px; color: var(--text-muted); }
input[type=text], input[type=number], input[type=date], input[type=password], input[type=email],
select, textarea {
  width: 100%; padding: 8px 10px; border: 1px solid var(--border); border-radius: var(--radius);
  font-family: var(--font-body); font-size: 14px; margin-bottom: 14px; background: #fff; color: var(--text);
}
textarea.code-editor { font-family: var(--font-mono); font-size: 13px; }
.field-row { display: flex; gap: 16px; }
.field-row > div { flex: 1; }

.messages { list-style: none; padding: 0; margin: 0 0 16px; }
.messages li { padding: 10px 14px; border-radius: var(--radius); margin-bottom: 8px; font-size: 14px; }
.messages .success { background: #E4F2E4; color: #2A6B2E; }
.messages .error { background: #FBE6E1; color: var(--danger); }

.empty-state { color: var(--text-muted); font-style: italic; padding: 24px 0; }
.stat-grid { display: grid; grid-template-columns: repeat(auto-fit, minmax(160px, 1fr)); gap: 14px; margin-bottom: 24px; }
.stat-card { background: var(--surface); border: 1px solid var(--border); border-radius: var(--radius); padding: 16px; }
.stat-card .value { font-size: 26px; font-weight: 700; color: var(--accent-dark); }
.stat-card .label { font-size: 13px; color: var(--text-muted); }

.graph-preview img { max-width: 100%; border: 1px solid var(--border); border-radius: var(--radius); }

.logout-btn {
  display: block;
  width: 100%;
  text-align: left;
  background: transparent;
  border: none;
  color: #CFE4E4;
  padding: 9px 20px;
  font-size: 14px;
  font-family: inherit;
  cursor: pointer;
}
.logout-btn:hover { background: rgba(255,255,255,0.08); color: #fff; }
.sidebar { background: var(--accent-dark); color: #EAF3F3; }
.stat-card .value { color: var(--accent-dark); }
.messages .success { background: #E4F2E4; color: #2A6B2E; }

.nav-section-label {
  padding: 16px 20px 6px;
  font-size: 11px;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: rgba(255,255,255,0.42);
}

.filter-bar {
  display: flex;
  gap: 8px;
  align-items: center;
  padding: 10px 12px;
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  margin-bottom: 14px;
  flex-wrap: wrap;
}
.filter-bar input[type="search"] {
  flex: 1;
  min-width: 240px;
  padding: 7px 10px;
  border: 1px solid var(--border);
  border-radius: var(--radius);
  font-size: 14px;
  font-family: inherit;
}
.filter-bar select {
  padding: 7px 10px;
  border: 1px solid var(--border);
  border-radius: var(--radius);
  background: #fff;
  font-size: 14px;
  font-family: inherit;
}

.btn-link, .btn-link-danger {
  background: none;
  border: none;
  padding: 0;
  font: inherit;
  cursor: pointer;
  text-decoration: underline;
}
.btn-link { color: var(--accent-dark); }
.btn-link:hover { color: var(--accent); }
.btn-link-danger { color: var(--danger); }
.btn-link-danger:hover { text-decoration: none; background: #FAE7E2; padding: 2px 6px; border-radius: 3px; }