/* ===== Page Skeleton ===== */

/* Full-height flex column: header → main → nav → footer */
body {
  display: flex;
  flex-direction: column;
  min-height: 100vh;    /* fallback for browsers without dvh support */
  min-height: 100dvh;   /* avoids mobile URL-bar resize jank */
}

/* ===== Header ===== */
header {
  position: sticky;
  top: 0;
  z-index: 100;
  background: var(--color-bg-translucent);                              /* fallback */
  background: color-mix(in srgb, var(--color-bg) 80%, transparent);    /* modern */
  backdrop-filter: blur(8px);
  -webkit-backdrop-filter: blur(8px);
  border-bottom: 1px solid var(--color-border);
}

.header-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  max-width: 680px;
  margin-inline: auto;
  padding: var(--space-sm) var(--space-md);
  gap: var(--space-sm);
}

.header-title {
  font-size: var(--text-lg);
  font-weight: 600;
  letter-spacing: 0.02em;
  color: var(--color-text-primary);
  white-space: nowrap;
}

.header-actions {
  display: flex;
  align-items: center;
  gap: var(--space-xs);
  flex-wrap: wrap;
  justify-content: flex-end;
}

/* ===== Main — Centered Readable Column ===== */
main {
  flex: 1;
  max-width: 680px;
  width: 100%;
  margin-inline: auto;
  padding: var(--space-lg) var(--space-md);
}

/* ===== Day Navigation Strip ===== */
nav.nav-day {
  position: sticky;
  bottom: 0;
  z-index: 99;
  background: var(--color-bg-translucent);                              /* fallback */
  background: color-mix(in srgb, var(--color-bg) 80%, transparent);    /* modern */
  backdrop-filter: blur(8px);
  -webkit-backdrop-filter: blur(8px);
  display: flex;
  align-items: center;
  justify-content: space-between;
  max-width: 680px;
  width: 100%;
  margin-inline: auto;
  padding: var(--space-sm) var(--space-md);
  border-top: 1px solid var(--color-border);
  gap: var(--space-sm);
}

/* ===== Footer ===== */
footer {
  padding: var(--space-sm) var(--space-md);
  text-align: center;
  color: var(--color-text-secondary);
  font-size: var(--text-sm);
  border-top: 1px solid var(--color-border);
}

/* ===== Responsive Overflow Guard ===== */
body {
  overflow-x: hidden;
}