/* Buttons */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  padding: 14px 32px;
  font-family: var(--font-heading);
  font-size: 0.875rem;
  font-weight: 600;
  letter-spacing: 1px;
  text-transform: uppercase;
  border-radius: var(--radius-sm);
  transition: all var(--transition);
  cursor: pointer;
  border: none;
}

.btn-primary {
  background: linear-gradient(120deg, var(--primary) 0%, #6475ff 48%, var(--secondary) 100%);
  color: var(--text);
  box-shadow: var(--glow);
}

.btn-primary:hover {
  transform: translateY(-2px);
  box-shadow: var(--glow-strong);
  color: var(--text);
}

.btn-outline {
  background: transparent;
  color: var(--text);
  border: 1px solid var(--primary);
}

.btn-outline:hover {
  background: var(--primary);
  color: var(--text);
  box-shadow: var(--glow);
}

.btn-sm {
  padding: 10px 20px;
  font-size: 0.75rem;
}

/* Glass Card */
.glass-card {
  background: var(--glass-bg);
  backdrop-filter: blur(20px);
  -webkit-backdrop-filter: blur(20px);
  border: 1px solid var(--glass-border);
  border-radius: var(--radius);
  padding: 32px;
  transition: all var(--transition);
}

.glass-card:hover {
  border-color: rgba(0, 229, 255, 0.4);
  box-shadow: var(--glow);
  transform: translateY(-4px);
}

/* Header */
.header {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  z-index: 1000;
  height: var(--header-height);
  transition: all var(--transition);
}

.header.scrolled {
  background: rgba(3, 5, 22, 0.95);
  backdrop-filter: blur(20px);
  -webkit-backdrop-filter: blur(20px);
  border-bottom: 1px solid var(--glass-border);
  box-shadow: 0 4px 30px rgba(0, 0, 0, 0.3);
}

.header__inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 100%;
}

.header__logo {
  font-family: var(--font-heading);
  font-size: 1.5rem;
  font-weight: 800;
  letter-spacing: 2px;
  text-transform: uppercase;
  background: linear-gradient(110deg, var(--primary), #75a7ff 48%, var(--secondary));
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

.header__nav {
  display: flex;
  align-items: center;
  gap: 36px;
}

.header__link {
  font-family: var(--font-heading);
  font-size: 0.8125rem;
  font-weight: 500;
  letter-spacing: 1px;
  text-transform: uppercase;
  color: var(--gray);
  position: relative;
  padding: 4px 0;
}

.header__link::after {
  content: '';
  position: absolute;
  bottom: 0;
  left: 0;
  width: 0;
  height: 2px;
  background: var(--primary);
  transition: width var(--transition);
}

.header__link:hover,
.header__link.active {
  color: var(--text);
}

.header__link:hover::after,
.header__link.active::after {
  width: 100%;
}

.header__actions {
  display: flex;
  align-items: center;
  gap: 16px;
}

.header-cart-button {
  min-height: 42px;
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 9px 12px;
  color: var(--text);
  background: rgba(255, 255, 255, 0.06);
  border: 1px solid var(--glass-border);
  border-radius: var(--radius-sm);
  transition: all var(--transition);
}

.header-cart-button:hover,
.header-cart-button[aria-expanded="true"] {
  border-color: var(--primary);
  background: rgba(0, 229, 255, 0.12);
}

.header-cart-button__label {
  font-family: var(--font-heading);
  font-size: 0.75rem;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.5px;
}

.header-cart-button__count {
  min-width: 20px;
  height: 20px;
  padding: 0 5px;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  border-radius: 999px;
  background: var(--primary);
  color: var(--text);
  font-size: 0.6875rem;
  font-weight: 700;
}

.header-cart-button__count.is-empty {
  background: rgba(255, 255, 255, 0.12);
  color: var(--gray);
}

.header__burger {
  display: none;
  flex-direction: column;
  gap: 5px;
  padding: 8px;
  z-index: 1001;
}

.header__burger span {
  display: block;
  width: 24px;
  height: 2px;
  background: var(--text);
  transition: all var(--transition);
  border-radius: 2px;
}

.header__burger.active span:nth-child(1) {
  transform: rotate(45deg) translate(5px, 5px);
}

.header__burger.active span:nth-child(2) {
  opacity: 0;
}

.header__burger.active span:nth-child(3) {
  transform: rotate(-45deg) translate(5px, -5px);
}

/* Mobile Nav */
.mobile-nav {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  bottom: 0;
  background:
    radial-gradient(circle at 20% 20%, rgba(0, 240, 255, 0.14), transparent 32%),
    radial-gradient(circle at 80% 75%, rgba(255, 0, 122, 0.14), transparent 34%),
    rgba(3, 5, 22, 0.98);
  backdrop-filter: blur(20px);
  z-index: 999;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  gap: 32px;
  opacity: 0;
  visibility: hidden;
  transition: all var(--transition);
}

.mobile-nav.active {
  opacity: 1;
  visibility: visible;
}

.mobile-nav__link {
  font-family: var(--font-heading);
  font-size: 1.5rem;
  font-weight: 600;
  letter-spacing: 2px;
  text-transform: uppercase;
  color: var(--gray);
  transition: color var(--transition);
}

.mobile-nav__link:hover,
.mobile-nav__link.active {
  color: var(--primary);
}

/* Footer */
.footer {
  background: var(--card);
  border-top: 1px solid var(--glass-border);
  padding: 80px 0 32px;
}

.footer__grid {
  display: grid;
  grid-template-columns: 2fr 1fr 1fr 1.5fr;
  gap: 48px;
  margin-bottom: 60px;
}

.footer__brand-name {
  font-family: var(--font-heading);
  font-size: 1.75rem;
  font-weight: 800;
  letter-spacing: 2px;
  text-transform: uppercase;
  background: linear-gradient(110deg, var(--primary), #75a7ff 48%, var(--secondary));
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
  margin-bottom: 16px;
}

.footer__brand-desc {
  color: var(--gray);
  font-size: 0.875rem;
  line-height: 1.8;
  margin-bottom: 24px;
}

.footer__social {
  display: flex;
  gap: 12px;
}

.footer__social-link {
  width: 40px;
  height: 40px;
  display: flex;
  align-items: center;
  justify-content: center;
  border-radius: 50%;
  border: 1px solid var(--glass-border);
  color: var(--gray);
  transition: all var(--transition);
}

.footer__social-link:hover {
  background: var(--primary);
  border-color: var(--primary);
  color: var(--text);
  box-shadow: var(--glow);
}

.footer__title {
  font-family: var(--font-heading);
  font-size: 0.875rem;
  font-weight: 600;
  letter-spacing: 2px;
  text-transform: uppercase;
  margin-bottom: 24px;
  color: var(--text);
}

.footer__links li {
  margin-bottom: 12px;
}

.footer__links a {
  color: var(--gray);
  font-size: 0.875rem;
  transition: all var(--transition);
}

.footer__links a:hover {
  color: var(--primary);
  padding-left: 4px;
}

.footer__contact-item {
  display: flex;
  align-items: flex-start;
  gap: 12px;
  margin-bottom: 16px;
  color: var(--gray);
  font-size: 0.875rem;
}

.footer__contact-item i {
  color: var(--primary);
  margin-top: 4px;
  width: 16px;
}

.footer__bottom {
  border-top: 1px solid var(--glass-border);
  padding-top: 32px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  flex-wrap: wrap;
  gap: 16px;
}

.footer__copyright {
  color: var(--gray);
  font-size: 0.8125rem;
}

.contact-fab {
  position: fixed;
  right: 20px;
  bottom: 20px;
  z-index: 1400;
  display: flex;
  flex-direction: column;
  gap: 12px;
}

.contact-fab__button {
  width: 54px;
  height: 54px;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  border-radius: 50%;
  color: var(--text);
  box-shadow: 0 12px 28px rgba(0, 0, 0, 0.34);
  transition: transform var(--transition), filter var(--transition);
}

.contact-fab__button:hover {
  transform: translateY(-2px);
  filter: brightness(1.05);
}

.contact-fab__button i {
  font-size: 1.125rem;
}

.contact-fab__button--facebook {
  background: linear-gradient(135deg, #1877f2, #0f5fc0);
}

.contact-fab__button--zalo {
  background: linear-gradient(135deg, #0068ff, #2f8cff);
}

.contact-fab__button--phone {
  background: linear-gradient(135deg, #16a34a, #22c55e);
}

/* Modal */
.modal-overlay {
  position: fixed;
  inset: 0;
  background: rgba(0, 0, 0, 0.8);
  backdrop-filter: blur(8px);
  z-index: 2000;
  display: flex;
  align-items: center;
  justify-content: center;
  opacity: 0;
  visibility: hidden;
  transition: all var(--transition);
  padding: 24px;
}

.modal-overlay.active {
  opacity: 1;
  visibility: visible;
}

.modal {
  background: var(--card);
  border: 1px solid var(--glass-border);
  border-radius: var(--radius);
  padding: 48px;
  max-width: 480px;
  width: 100%;
  text-align: center;
  transform: scale(0.9) translateY(20px);
  transition: transform var(--transition);
  box-shadow: var(--glow-strong);
}

.modal-overlay.active .modal {
  transform: scale(1) translateY(0);
}

.modal__icon {
  width: 72px;
  height: 72px;
  border-radius: 50%;
  background: linear-gradient(135deg, var(--primary), var(--secondary));
  display: flex;
  align-items: center;
  justify-content: center;
  margin: 0 auto 24px;
  font-size: 2rem;
  box-shadow: var(--glow);
}

.modal__title {
  font-size: 1.5rem;
  margin-bottom: 12px;
}

.modal__text {
  color: var(--gray);
  margin-bottom: 32px;
  line-height: 1.7;
}

/* Form */
.form-group {
  margin-bottom: 20px;
}

.form-label {
  display: block;
  font-family: var(--font-heading);
  font-size: 0.75rem;
  font-weight: 600;
  letter-spacing: 1px;
  text-transform: uppercase;
  margin-bottom: 8px;
  color: var(--gray);
}

.form-label .required {
  color: var(--primary);
}

.form-input,
.form-select,
.form-textarea {
  width: 100%;
  padding: 14px 18px;
  background: rgba(255, 255, 255, 0.05);
  border: 1px solid var(--glass-border);
  border-radius: var(--radius-sm);
  color: var(--text);
  transition: all var(--transition);
  outline: none;
}

.form-input:focus,
.form-select:focus,
.form-textarea:focus {
  border-color: var(--primary);
  box-shadow: 0 0 0 3px rgba(0, 229, 255, 0.15);
}

.form-input.error,
.form-select.error,
.form-textarea.error {
  border-color: #ef4444;
}

.form-error {
  color: #ef4444;
  font-size: 0.75rem;
  margin-top: 6px;
  display: none;
}

.form-error.visible {
  display: block;
}

.form-helper {
  display: block;
  color: var(--gray);
  font-size: 0.75rem;
  margin-top: 6px;
}

.form-textarea {
  resize: vertical;
  min-height: 100px;
}

.form-row {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 20px;
}

.form-select {
  appearance: none;
  background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='12' height='12' fill='%23A1A1AA' viewBox='0 0 16 16'%3E%3Cpath d='M8 11L3 6h10z'/%3E%3C/svg%3E");
  background-repeat: no-repeat;
  background-position: right 16px center;
  padding-right: 40px;
  cursor: pointer;
}

.form-select option {
  background: var(--card);
  color: var(--text);
}

/* Badge */
.badge {
  display: inline-block;
  padding: 4px 12px;
  font-size: 0.6875rem;
  font-weight: 600;
  letter-spacing: 1px;
  text-transform: uppercase;
  border-radius: 20px;
  background: rgba(0, 229, 255, 0.15);
  color: var(--primary);
  border: 1px solid rgba(0, 229, 255, 0.3);
}

/* Loading spinner */
.spinner {
  width: 20px;
  height: 20px;
  border: 2px solid rgba(255, 255, 255, 0.3);
  border-top-color: var(--text);
  border-radius: 50%;
  animation: spin 0.6s linear infinite;
}

@keyframes spin {
  to { transform: rotate(360deg); }
}

.btn.loading {
  pointer-events: none;
  opacity: 0.8;
}

/* Customer account */
.header-account-button {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  min-height: 40px;
  padding: 0 14px;
  border: 1px solid rgba(255, 255, 255, 0.16);
  border-radius: 999px;
  background: rgba(255, 255, 255, 0.04);
  color: var(--text);
  font: inherit;
  font-size: 0.875rem;
  font-weight: 700;
  cursor: pointer;
  transition: border-color 0.25s ease, color 0.25s ease, background 0.25s ease;
}

.header-account-button:hover {
  border-color: var(--primary);
  color: var(--primary);
  background: rgba(0, 229, 255, 0.08);
}

.mobile-nav__account {
  width: 100%;
  border: 0;
  background: transparent;
  text-align: left;
  cursor: pointer;
}

.customer-account-panel {
  position: fixed;
  inset: 0;
  z-index: 1000;
  pointer-events: none;
  opacity: 0;
  transition: opacity 0.25s ease;
}

.customer-account-panel.active {
  pointer-events: auto;
  opacity: 1;
}

.customer-account-panel__backdrop {
  position: absolute;
  inset: 0;
  background: rgba(0, 0, 0, 0.68);
  backdrop-filter: blur(6px);
}

.customer-account-panel__sheet {
  position: absolute;
  top: 0;
  right: 0;
  width: min(100%, 430px);
  height: 100%;
  padding: 32px 24px;
  overflow-y: auto;
  border-left: 1px solid rgba(255, 255, 255, 0.12);
  background: var(--card);
  box-shadow: -24px 0 60px rgba(0, 0, 0, 0.45);
  transform: translateX(100%);
  transition: transform 0.3s ease;
}

.customer-account-panel.active .customer-account-panel__sheet {
  transform: translateX(0);
}

.customer-account-panel__close {
  position: absolute;
  top: 18px;
  right: 18px;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 40px;
  height: 40px;
  border: 1px solid rgba(255, 255, 255, 0.14);
  border-radius: 50%;
  background: rgba(255, 255, 255, 0.04);
  color: var(--text);
  cursor: pointer;
}

.customer-account-panel__eyebrow {
  margin: 14px 0 8px;
  color: var(--primary);
  font-size: 0.75rem;
  font-weight: 800;
  letter-spacing: 0.2em;
  text-transform: uppercase;
}

.customer-account-panel__title {
  margin: 0 0 22px;
  font-family: var(--font-display);
  font-size: clamp(1.7rem, 5vw, 2.4rem);
  line-height: 1.05;
}

.customer-account-tabs {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 6px;
  padding: 6px;
  margin-bottom: 22px;
  border: 1px solid rgba(255, 255, 255, 0.12);
  border-radius: 14px;
  background: rgba(255, 255, 255, 0.04);
}

.customer-account-tabs button {
  min-height: 42px;
  border: 0;
  border-radius: 10px;
  background: transparent;
  color: var(--muted);
  font: inherit;
  font-weight: 800;
  cursor: pointer;
}

.customer-account-tabs button.active {
  background: var(--primary);
  color: var(--background);
}

.customer-account-form {
  display: grid;
  gap: 12px;
}

.customer-account-form label {
  font-size: 0.875rem;
  font-weight: 700;
  color: var(--text);
}

.customer-account-panel__button {
  width: 100%;
  margin-top: 8px;
}

.customer-account-message {
  min-height: 20px;
  margin: 0;
  color: var(--primary);
  font-size: 0.875rem;
}

.customer-account-message[data-type="error"] {
  color: var(--accent);
}

.customer-account-card {
  display: grid;
  gap: 12px;
  padding: 18px;
  margin-bottom: 20px;
  border: 1px solid rgba(255, 255, 255, 0.12);
  border-radius: 16px;
  background: rgba(255, 255, 255, 0.04);
}

.customer-account-card p {
  margin: 0;
}

.customer-account-card__hint {
  color: var(--muted);
  font-size: 0.9rem;
  line-height: 1.6;
}