:root {
  --bg-main: #f5f7fb;
  --bg-card: #ffffff;
  --accent: #4b8dff;
  --accent-soft: #e0ecff;
  --accent-secondary: #7bd9c8;
  --text-main: #1f2933;
  --text-muted: #6b7280;
  --border-soft: #e5e7eb;
  --danger: #e11d48;
}

* { box-sizing: border-box; }

body {
  margin: 0;
  font-family: system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
  background: radial-gradient(circle at top left, #fef5ff, #f5f7fb 50%, #e8f4ff);
  color: var(--text-main);
}

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

.app-header {
  padding: 1rem 2rem;
  display: flex;
  justify-content: space-between;
  align-items: center;
  background: rgba(255,255,255,0.85);
  backdrop-filter: blur(10px);
  border-bottom: 1px solid var(--border-soft);
}

.app-header__brand {
  display: flex;
  flex-direction: column;
}

.app-header__title {
  font-weight: 700;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  font-size: 0.9rem;
  color: var(--accent);
}

.app-header__subtitle {
  font-size: 0.8rem;
  color: var(--text-muted);
}

.app-main {
  flex: 1;
  max-width: 1200px;
  margin: 0 auto;
  padding: 1.5rem;
}

.card {
  background: var(--bg-card);
  border-radius: 1.25rem;
  padding: 2rem;
  border: 1px solid var(--accent-soft);
  box-shadow: 0 16px 35px rgba(15,23,42,0.12);
}

.muted {
  color: var(--text-muted);
  font-size: 0.9rem;
}

.primary-btn {
  padding: 0.7rem 1.4rem;
  border-radius: 999px;
  border: none;
  background: linear-gradient(135deg, var(--accent), var(--accent-secondary));
  color: #fff;
  font-weight: 600;
  cursor: pointer;
}

.primary-btn:disabled {
  opacity: .6;
  cursor: default;
}

.header-btn {
  padding: 0.45rem 1.2rem;
  border-radius: 999px;
  border: none;
  background: var(--danger);
  color: #fff;
  font-size: 0.8rem;
  font-weight: 600;
  cursor: pointer;
}