/* ===== Top Header ===== */
.top-header {
  height: var(--header-height);
  background: var(--surface);
  border-bottom: 1px solid var(--border);
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 0 24px;
  position: sticky;
  top: 0;
  z-index: 50;
}
.header-left { display: flex; align-items: center; gap: 12px; }
.page-title { font-size: 16px; font-weight: 700; letter-spacing: -0.01em; }
.page-subtitle { font-size: 12px; color: var(--text-tertiary); }
.header-right { display: flex; align-items: center; gap: 12px; }

.mobile-menu-btn {
  display: none;
  border: none;
  background: none;
  cursor: pointer;
  color: var(--text-secondary);
  padding: 4px;
}

/* ===== Month Selector ===== */
.month-selector {
  display: flex;
  align-items: center;
  gap: 8px;
  background: var(--blue-bg);
  border-radius: var(--radius-sm);
  padding: 4px 8px;
}
.month-btn {
  width: 28px; height: 28px;
  border: none;
  background: transparent;
  cursor: pointer;
  display: flex;
  align-items: center;
  justify-content: center;
  border-radius: 6px;
  color: var(--blue);
  transition: background 0.15s;
}
.month-btn:hover { background: var(--blue-50); }
.month-label { font-size: 13px; font-weight: 600; color: var(--blue); min-width: 80px; text-align: center; cursor: pointer; }

/* ===== Month Picker Popup ===== */
.month-picker {
  position: absolute;
  top: calc(100% + 6px);
  right: 0;
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  box-shadow: var(--shadow-lg);
  padding: 12px;
  z-index: 60;
  width: 232px;
  display: none;
}
.month-picker.open { display: block; }
.mp-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  margin-bottom: 8px;
  padding: 0 4px;
}
.mp-year { font-size: 14px; font-weight: 700; color: var(--text-primary); }
.mp-nav {
  width: 28px; height: 28px;
  border: none;
  background: transparent;
  cursor: pointer;
  display: flex;
  align-items: center;
  justify-content: center;
  border-radius: 6px;
  color: var(--text-secondary);
}
.mp-nav:hover { background: var(--bg); }
.mp-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 4px;
}
.mp-month {
  padding: 8px 4px;
  border: none;
  background: transparent;
  border-radius: 6px;
  font-size: 13px;
  font-weight: 500;
  cursor: pointer;
  color: var(--text-primary);
  font-family: inherit;
  transition: background 0.15s;
}
.mp-month:hover { background: var(--blue-bg); color: var(--blue); }
.mp-month.active { background: var(--blue); color: #fff; }

/* ===== Theme Toggle Button ===== */
.theme-toggle-btn {
  width: 32px; height: 32px;
  border: 1px solid var(--border);
  border-radius: 8px;
  background: var(--surface);
  cursor: pointer;
  display: flex;
  align-items: center;
  justify-content: center;
  color: var(--text-secondary);
  transition: background 0.15s, color 0.15s;
}
.theme-toggle-btn:hover { background: var(--bg); }
.theme-toggle-btn svg { width: 16px; height: 16px; }