/* =========================================================
   UCore — базовая визуальная система
   ========================================================= */

:root {
  --bg: #f5f7fb;
  --surface: #ffffff;
  --surface-alt: #f8fbff;
  --text: #0f172a;
  --text-muted: #64748b;

  --primary: #2563eb;
  --primary-hover: #1d4ed8;
  --accent: #14b8a6;
  --accent-dark: #0f766e;

  --border: #dbe3ef;
  --border-light: #e9eef5;
  --danger: #d14343;

  --radius-sm: 8px;
  --radius-md: 12px;
  --radius-lg: 18px;

  --shadow-card: 0 14px 40px rgba(15, 23, 42, 0.06);
  --shadow-menu: 0 18px 36px rgba(15, 23, 42, 0.14);
}

* { box-sizing: border-box; }
html, body { min-height: 100%; }
body {
  margin: 0;
  font-family: system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
  font-size: 14px;
  line-height: 1.45;
  color: var(--text);
  background: var(--bg);
}

a { color: var(--primary); text-decoration: none; }
a:hover { color: var(--primary-hover); }

.app-shell {
  min-height: 100vh;
  display: grid;
  grid-template-columns: 260px minmax(0, 1fr);
}

.app-main {
  min-width: 0;
  display: flex;
  flex-direction: column;
}

.page-content {
  width: 100%;
  max-width: 1500px;
  margin: 0 auto;
  padding: 32px;
}

h1 {
  margin: 0 0 20px;
  font-size: 30px;
  line-height: 1.15;
}

h2 { margin-top: 0; }

.grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(240px, 1fr));
  gap: 18px;
}

.card {
  padding: 22px;
  color: inherit;
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius-lg);
  box-shadow: var(--shadow-card);
}

.toolbar {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 20px;
  margin-bottom: 18px;
}
.toolbar h1 { margin-bottom: 0; }

.page-heading {
  display: flex;
  flex-direction: column;
  gap: 6px;
  margin-bottom: 24px;
}
.page-heading h1 { margin: 0; }
.page-subtitle {
  margin: 0;
  color: var(--text-muted);
  font-size: 14px;
  line-height: 1.45;
}

.warning,
.error,
.info-box {
  margin-bottom: 18px;
  padding: 14px 16px;
  border-radius: var(--radius-md);
  border: 1px solid var(--border);
}
.warning { background: #fff8dc; border-color: #f3df9f; }
.error { background: #fff3f3; border-color: #f1caca; }
.info-box { background: #f6fbff; }

@media (max-width: 1100px) {
  .app-shell { grid-template-columns: 86px minmax(0, 1fr); }
  .page-content { padding: 24px; }
}

@media (max-width: 760px) {
  .app-shell { grid-template-columns: 1fr; }
  .page-content { padding: 20px 16px; }
  h1 { font-size: 26px; }
}