:root {
  --c-primary: #6690f4;
  --c-primary-dark: #3164db;
  --c-bg: #f4f6f9;
  --c-surface: #ffffff;
  --c-text: #4e5e6a;
  --c-text-strong: #2d3748;
  --c-muted: #718096;
  --c-border: #e2e8f0;
  --c-danger: #cc0000;
  --shadow-card: 0 1px 4px rgba(0, 0, 0, 0.06);
  --focus-ring: 0 0 0 3px rgba(102, 144, 244, 0.15);
}

* {
  box-sizing: border-box;
}

html,
body {
  min-height: 100%;
}

body {
  margin: 0;
  font-family: "Roboto", "Segoe UI", sans-serif;
  font-size: 14px;
  color: var(--c-text);
  background: var(--c-bg);
}

a {
  color: var(--c-primary);
}

.topbar {
  height: 56px;
  border-bottom: 1px solid var(--c-border);
  background: var(--c-surface);
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 0 20px;
  position: sticky;
  top: 0;
  z-index: 100;
}

.brand {
  font-size: 22px;
  font-weight: 300;
  letter-spacing: -0.02em;
  color: var(--c-text-strong);
}

.brand strong {
  font-weight: 700;
}

.logout-btn {
  min-height: 38px;
  border: 1px solid var(--c-border);
  border-radius: 8px;
  padding: 0 14px;
  font: inherit;
  font-weight: 600;
  color: var(--c-text-strong);
  background: var(--c-surface);
  cursor: pointer;
  transition: border-color 0.2s ease, color 0.2s ease, background-color 0.2s ease;
}

.logout-btn:hover {
  border-color: #cbd5e0;
  background: #f8fafc;
}

.logout-btn:focus-visible {
  outline: none;
  box-shadow: var(--focus-ring);
  border-color: var(--c-primary);
}

.container {
  max-width: 1120px;
  margin: 24px auto;
  padding: 0 18px 24px;
}

.card {
  background: var(--c-surface);
  border-radius: 10px;
  box-shadow: var(--shadow-card);
  padding: 24px;
}

.card h1 {
  margin: 0 0 10px;
  color: var(--c-text-strong);
  font-size: 24px;
  font-weight: 700;
}

.muted {
  color: var(--c-muted);
}

.accent {
  color: var(--c-primary);
  font-weight: 600;
}

.btn {
  min-height: 38px;
  padding: 8px 16px;
  border: 0;
  border-radius: 8px;
  color: #ffffff;
  background: var(--c-primary);
  font: inherit;
  font-weight: 600;
  text-decoration: none;
  cursor: pointer;
  transition: background-color 0.2s ease;
}

.btn:hover {
  background: var(--c-primary-dark);
}

.btn:focus-visible {
  outline: none;
  box-shadow: var(--focus-ring);
}

.form-control {
  width: 100%;
  min-height: 38px;
  border: 1px solid var(--c-border);
  border-radius: 8px;
  padding: 7px 12px;
  font: inherit;
  color: var(--c-text-strong);
  background: #ffffff;
  transition: border-color 0.2s ease, box-shadow 0.2s ease;
}

.form-control:focus {
  outline: none;
  border-color: var(--c-primary);
  box-shadow: var(--focus-ring);
}

@media (max-width: 768px) {
  .topbar {
    padding: 0 14px;
  }

  .brand {
    font-size: 20px;
  }

  .container {
    margin-top: 16px;
    padding: 0 14px 18px;
  }

  .card {
    padding: 18px;
  }
}