/*
  Base styles: resets, global typography, and layout primitives.
  Keeps every component starting from a consistent, predictable baseline.
*/

*, *::before, *::after {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}

html {
  scroll-behavior: smooth;
}

body {
  font-family: var(--font-sans);
  background: var(--color-bg);
  color: var(--color-text-primary);
  line-height: 1.5;
  min-height: 100vh;
  -webkit-font-smoothing: antialiased;
}

a {
  color: inherit;
  text-decoration: none;
}

button {
  font-family: inherit;
  cursor: pointer;
  border: none;
  background: none;
}

img {
  max-width: 100%;
  display: block;
}

/* ---- App Shell Layout ---- */

.app-header {
  position: sticky;
  top: 0;
  z-index: 50;
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
  background: rgba(11, 12, 20, 0.75);
  border-bottom: 1px solid var(--color-border);
}

.app-header__inner {
  max-width: 1200px;
  margin: 0 auto;
  padding: var(--space-4) var(--space-6);
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: var(--space-6);
}

.brand {
  display: flex;
  align-items: center;
  gap: var(--space-2);
  font-weight: 700;
  font-size: var(--text-lg);
}

.brand__mark {
  font-size: var(--text-xl);
}

.main-nav {
  display: flex;
  gap: var(--space-6);
  flex: 1;
}

.main-nav__link {
  font-size: var(--text-sm);
  font-weight: 500;
  color: var(--color-text-secondary);
  padding: var(--space-2) 0;
  position: relative;
  transition: color var(--transition-fast);
}

.main-nav__link:hover {
  color: var(--color-text-primary);
}

.main-nav__link.is-active {
  color: var(--color-text-primary);
}

.main-nav__link.is-active::after {
  content: '';
  position: absolute;
  bottom: -1px;
  left: 0;
  right: 0;
  height: 2px;
  background: var(--color-primary);
  border-radius: var(--radius-full);
}

.icon-button {
  width: 36px;
  height: 36px;
  border-radius: var(--radius-full);
  display: grid;
  place-items: center;
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  transition: background var(--transition-fast);
}

.icon-button:hover {
  background: var(--color-surface-hover);
}

.app-content {
  max-width: 1200px;
  margin: 0 auto;
  padding: var(--space-8) var(--space-6) var(--space-16);
  min-height: calc(100vh - 70px);
}

/* ---- Light theme override ---- */
body.theme-light {
  --color-bg: #f7f7fb;
  --color-bg-elevated: #ffffff;
  --color-surface: rgba(15, 15, 30, 0.03);
  --color-surface-hover: rgba(15, 15, 30, 0.06);
  --color-border: rgba(15, 15, 30, 0.08);
  --color-text-primary: #14141f;
  --color-text-secondary: #55556b;
  --color-text-muted: #8a8a9c;
}

/* ---- Responsive adjustments ---- */
@media (max-width: 640px) {
  .app-header__inner {
    padding: var(--space-3) var(--space-4);
    gap: var(--space-3);
  }

  .main-nav {
    gap: var(--space-3);
  }

  .main-nav__link {
    font-size: var(--text-xs);
  }

  .brand__name {
    display: none; /* Icon-only brand on very small screens to save space */
  }

  .app-content {
    padding: var(--space-6) var(--space-4) var(--space-12);
  }

  .view-title {
    font-size: var(--text-2xl);
  }

  .toolbar {
    flex-direction: column;
  }

  .events-grid {
    grid-template-columns: 1fr;
  }

  .reg-card {
    flex-direction: column;
    align-items: flex-start;
  }

  .reg-card .btn--danger {
    width: 100%;
  }
}