/* ══════════════════════════════════════════════════════════════════════════
   Shipping Cost Calculator — Styles
   ══════════════════════════════════════════════════════════════════════════ */

/* ── Reset & Base ───────────────────────────────────────────────────────── */
*,
*::before,
*::after {
  margin: 0;
  padding: 0;
  box-sizing: border-box;
}

:root {
  --clr-primary: #2563eb;
  --clr-primary-dark: #1d4ed8;
  --clr-primary-light: #dbeafe;
  --clr-accent: #10b981;
  --clr-accent-light: #d1fae5;
  --clr-danger: #ef4444;
  --clr-danger-light: #fee2e2;
  --clr-warning: #f59e0b;
  --clr-bg: #f1f5f9;
  --clr-surface: #ffffff;
  --clr-text: #1e293b;
  --clr-text-muted: #64748b;
  --clr-border: #e2e8f0;
  --radius: 12px;
  --radius-sm: 8px;
  --shadow: 0 1px 3px rgba(0, 0, 0, 0.06), 0 1px 2px rgba(0, 0, 0, 0.04);
  --shadow-md: 0 4px 6px -1px rgba(0, 0, 0, 0.07),
    0 2px 4px -2px rgba(0, 0, 0, 0.05);
  --shadow-lg: 0 10px 25px -5px rgba(0, 0, 0, 0.08),
    0 8px 10px -6px rgba(0, 0, 0, 0.04);
  --transition: 0.2s ease;
}

html {
  font-size: 16px;
  scroll-behavior: smooth;
}

body {
  font-family: "Inter", -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto,
    sans-serif;
  background: var(--clr-bg);
  color: var(--clr-text);
  line-height: 1.6;
  min-height: 100vh;
  display: flex;
  flex-direction: column;
}

.container {
  width: 100%;
  max-width: 1200px;
  margin: 0 auto;
  padding: 0 1.5rem;
}

/* ── Header ─────────────────────────────────────────────────────────────── */
.header {
  background: linear-gradient(135deg, var(--clr-primary), var(--clr-primary-dark));
  color: #fff;
  padding: 0.75rem 0;
  box-shadow: var(--shadow-md);
}

.header__brand {
  display: flex;
  align-items: center;
  gap: 0.5rem;
}

.header__logo {
  font-size: 1.4rem;
}

.header__title {
  font-size: 1.3rem;
  font-weight: 700;
  letter-spacing: -0.5px;
}

.header__tagline {
  margin-top: 0.1rem;
  opacity: 0.85;
  font-size: 0.82rem;
}

/* ── Main Layout ────────────────────────────────────────────────────────── */
.main {
  flex: 1;
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 1.25rem;
  padding-top: 1rem;
  padding-bottom: 1rem;
  align-items: start;
}

/* ── Cards ──────────────────────────────────────────────────────────────── */
.card {
  background: var(--clr-surface);
  border-radius: var(--radius);
  box-shadow: var(--shadow);
  padding: 1.25rem 1.25rem 1rem;
}

.card__heading {
  font-size: 1.1rem;
  font-weight: 700;
  margin-bottom: 0.75rem;
  color: var(--clr-text);
}

/* ── Field groups ───────────────────────────────────────────────────────── */
.field-group {
  border: none;
  margin-bottom: 0.6rem;
}

.field-group__title {
  font-size: 0.78rem;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.5px;
  color: var(--clr-text-muted);
  margin-bottom: 0.3rem;
}

.field {
  display: flex;
  flex-direction: column;
  gap: 0.15rem;
}

.field label {
  font-size: 0.8rem;
  font-weight: 500;
  color: var(--clr-text);
}

.field input {
  padding: 0.45rem 0.7rem;
  border: 1.5px solid var(--clr-border);
  border-radius: var(--radius-sm);
  font-size: 0.88rem;
  font-family: inherit;
  transition: border-color var(--transition), box-shadow var(--transition);
  outline: none;
  width: 100%;
}

.field input:focus {
  border-color: var(--clr-primary);
  box-shadow: 0 0 0 3px var(--clr-primary-light);
}

.field input.input--error {
  border-color: var(--clr-danger);
  box-shadow: 0 0 0 3px var(--clr-danger-light);
}

.field__error {
  font-size: 0.72rem;
  color: var(--clr-danger);
  min-height: 0.85rem;
}

.field-row {
  display: grid;
  grid-template-columns: 1fr 1fr 1fr;
  gap: 0.75rem;
}

.field-row--2col {
  grid-template-columns: 1fr 1fr;
}

/* ── Shipping option cards ──────────────────────────────────────────────── */
.shipping-options {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 0.75rem;
}

.shipping-option {
  cursor: pointer;
}

.shipping-option input[type="radio"] {
  display: none;
}

.shipping-option__card {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 0.15rem;
  padding: 0.55rem 0.35rem;
  border: 2px solid var(--clr-border);
  border-radius: var(--radius-sm);
  transition: all var(--transition);
  text-align: center;
}

.shipping-option__card:hover {
  border-color: var(--clr-primary);
  background: var(--clr-primary-light);
}

.shipping-option input:checked + .shipping-option__card {
  border-color: var(--clr-primary);
  background: var(--clr-primary-light);
  box-shadow: 0 0 0 2px var(--clr-primary);
}

.shipping-option__icon {
  font-size: 1.2rem;
}

.shipping-option__name {
  font-weight: 600;
  font-size: 0.78rem;
}

.shipping-option__delivery {
  font-size: 0.7rem;
  color: var(--clr-text-muted);
}

/* ── Buttons ────────────────────────────────────────────────────────────── */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 0.4rem;
  padding: 0.55rem 1.25rem;
  border: none;
  border-radius: var(--radius-sm);
  font-size: 0.88rem;
  font-weight: 600;
  font-family: inherit;
  cursor: pointer;
  transition: all var(--transition);
  margin-top: 0.35rem;
}

.btn-row {
  display: flex;
  gap: 0.75rem;
  margin-top: 0.35rem;
}

.btn--primary {
  background: var(--clr-primary);
  color: #fff;
  width: 100%;
}

.btn--primary:hover {
  background: var(--clr-primary-dark);
  box-shadow: var(--shadow-md);
}

.btn--primary:active {
  transform: scale(0.98);
}

.btn--secondary {
  background: transparent;
  color: var(--clr-text-muted);
  width: 100%;
  border: 1.5px solid var(--clr-border);
  margin-top: 0;
}

.btn--secondary:hover {
  background: var(--clr-bg);
}

/* ── Empty state ────────────────────────────────────────────────────────── */
.empty-state {
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  text-align: center;
  padding: 4rem 2rem;
  color: var(--clr-text-muted);
}

.empty-state__icon {
  font-size: 3.5rem;
  margin-bottom: 1rem;
}

.empty-state h3 {
  font-size: 1.15rem;
  color: var(--clr-text);
  margin-bottom: 0.5rem;
}

.empty-state p {
  font-size: 0.9rem;
  max-width: 280px;
}

/* ── Results ────────────────────────────────────────────────────────────── */
.hidden {
  display: none !important;
}

.results__summary {
  text-align: center;
  padding: 2rem 1rem 1.5rem;
  background: linear-gradient(135deg, var(--clr-primary-light), #ede9fe);
  border-radius: var(--radius-sm);
  margin-bottom: 1.5rem;
}

.results__total-label {
  font-size: 0.85rem;
  font-weight: 500;
  color: var(--clr-text-muted);
  text-transform: uppercase;
  letter-spacing: 0.5px;
}

.results__total {
  font-size: 2.75rem;
  font-weight: 700;
  color: var(--clr-primary-dark);
  margin: 0.25rem 0;
  letter-spacing: -1px;
}

.results__method {
  display: inline-block;
  background: var(--clr-primary);
  color: #fff;
  padding: 0.25rem 0.85rem;
  border-radius: 999px;
  font-size: 0.8rem;
  font-weight: 600;
  margin-bottom: 0.5rem;
}

.results__delivery {
  font-size: 0.85rem;
  color: var(--clr-text-muted);
}

.results__section-title {
  font-size: 0.95rem;
  font-weight: 700;
  margin-bottom: 0.75rem;
  padding-bottom: 0.5rem;
  border-bottom: 1.5px solid var(--clr-border);
}

/* Breakdown list */
.breakdown-list,
.detail-list {
  list-style: none;
  margin-bottom: 1.5rem;
}

.breakdown-list li,
.detail-list li {
  display: flex;
  justify-content: space-between;
  padding: 0.45rem 0;
  font-size: 0.88rem;
}

.breakdown-list li + li,
.detail-list li + li {
  border-top: 1px solid var(--clr-border);
}

.breakdown-list .label {
  color: var(--clr-text-muted);
}

.breakdown-list .value {
  font-weight: 600;
}

.detail-list .label {
  color: var(--clr-text-muted);
}

.detail-list .value {
  font-weight: 600;
}

.tag--oversize {
  display: inline-block;
  background: var(--clr-danger-light);
  color: var(--clr-danger);
  font-size: 0.72rem;
  padding: 0.1rem 0.5rem;
  border-radius: 999px;
  font-weight: 600;
}

.tag--normal {
  display: inline-block;
  background: var(--clr-accent-light);
  color: var(--clr-accent);
  font-size: 0.72rem;
  padding: 0.1rem 0.5rem;
  border-radius: 999px;
  font-weight: 600;
}

/* Compare grid */
.compare-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 0.75rem;
}

.compare-card {
  border: 2px solid var(--clr-border);
  border-radius: var(--radius-sm);
  padding: 1rem;
  text-align: center;
  transition: all var(--transition);
}

.compare-card--active {
  border-color: var(--clr-primary);
  background: var(--clr-primary-light);
}

.compare-card__icon {
  font-size: 1.5rem;
}

.compare-card__name {
  font-weight: 600;
  font-size: 0.82rem;
  margin: 0.25rem 0;
}

.compare-card__price {
  font-size: 1.25rem;
  font-weight: 700;
  color: var(--clr-primary-dark);
}

.compare-card__delivery {
  font-size: 0.72rem;
  color: var(--clr-text-muted);
  margin-top: 0.2rem;
}

/* ── Footer ─────────────────────────────────────────────────────────────── */
.footer {
  background: var(--clr-surface);
  border-top: 1px solid var(--clr-border);
  padding: 0.6rem 0;
  text-align: center;
  font-size: 0.75rem;
  color: var(--clr-text-muted);
}

/* ── Animations ─────────────────────────────────────────────────────────── */
@keyframes fadeSlideIn {
  from {
    opacity: 0;
    transform: translateY(12px);
  }
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

.results {
  animation: fadeSlideIn 0.35s ease-out;
}

/* ── Responsive ─────────────────────────────────────────────────────────── */
@media (max-width: 900px) {
  .main {
    grid-template-columns: 1fr;
  }
}

@media (max-width: 520px) {
  .field-row {
    grid-template-columns: 1fr;
  }

  .shipping-options {
    grid-template-columns: 1fr;
  }

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

  .results__total {
    font-size: 2.2rem;
  }
}