/* ===== Layout & Containers ===== */

.container {
  background: rgba(255, 255, 255, 0.06);
  border-radius: 24px;
  box-shadow: 0 20px 50px rgba(0, 0, 0, 0.3);
  border: 1px solid rgba(255, 255, 255, 0.12);
  padding: 30px;
  max-width: 500px;
  width: 100%;
  position: relative;
}

.container--wide { max-width: 900px; }
.container--admin { max-width: 1000px; }
.container--spreadsheet { max-width: 1600px; }

.container::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  bottom: 0;
  background: rgba(255, 255, 255, 0.05);
  backdrop-filter: blur(25px);
  -webkit-backdrop-filter: blur(25px);
  border-radius: 20px;
  z-index: -1;
}

.main-form-layout {
  display: flex;
  gap: 20px;
  flex-wrap: wrap;
  width: 100%;
}

.layout-column {
  flex: 1 1 280px;
  min-width: 0;
  display: flex;
  flex-direction: column;
  gap: 20px;
  max-width: 100%;
  box-sizing: border-box;
}

.layout-column.wide {
  flex: 3 1 400px;
}

.flex-align-end {
  align-items: flex-end;
}

/* Button Group */
.btn-group {
  display: flex;
  gap: 10px;
}
.btn-group button {
  flex: 1;
}

/* Variant Section (Common Card Component) */
.variant-section {
  background: rgba(255, 255, 255, 0.1);
  border: 1px solid rgba(255, 255, 255, 0.18);
  border-radius: 18px;
  box-shadow: 0 10px 35px rgba(0, 0, 0, 0.25);
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
  position: relative;
  z-index: 1;
}

.variant-section:focus-within,
.variant-section:hover {
  z-index: 10;
}

.variant-section.has-active-dropdown {
  z-index: 10000;
}

.variant-section__header {
  padding: 16px 18px;
  display: flex;
  justify-content: space-between;
  align-items: center;
  gap: 12px;
  border-bottom: 1px solid rgba(255, 255, 255, 0.1);
}

.variant-section__title {
  margin: 0;
  font-size: 14px;
  font-weight: 500;
  letter-spacing: 0.02em;
  opacity: 0.9;
  color: #fff;
}

.variant-section__content {
  padding: 18px;
}

/* Responsive Layouts */
@media (max-width: 1024px) {
  .layout-column.wide { flex: 2 1 300px; }
}

@media (max-width: 900px) {
  .main-form-layout { flex-direction: column; }
  .layout-column, .layout-column.wide { flex: 1 1 auto; min-width: 100%; }
  .flex-align-end { align-items: stretch; }
}

@media (max-width: 768px) {
  .container {
    max-width: 100%;
    padding: 20px;
    border-radius: 15px;
  }
  h1 { font-size: 24px; margin-bottom: 20px; }
}

@media (max-width: 480px) {
  .container { padding: 10px; border: none; border-radius: 10px; }
  h1 { font-size: 32px; }
}