/* ==========================================================================
   Aqua Care Trading - Responsive Stylesheet (Dark Theme)
   ========================================================================== */

/* Mobile Drawer Styles */
html,
body {
  overflow-x: hidden;
}

.mobile-drawer-overlay {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  bottom: 0;
  background: rgba(3, 7, 14, 0.75);
  backdrop-filter: blur(8px);
  z-index: 1500;
  display: none;
  opacity: 0;
  transition: opacity var(--transition-normal);
}

.mobile-drawer-overlay.active {
  display: block;
  opacity: 1;
}

.mobile-drawer {
  position: fixed;
  top: 0;
  right: -320px;
  width: 310px;
  height: 100vh;
  height: 100dvh;
  background: #ffffff;
  border-left: 1px solid var(--border-subtle);
  z-index: 1600;
  padding: max(24px, env(safe-area-inset-top)) 20px max(24px, env(safe-area-inset-bottom));
  display: flex;
  flex-direction: column;
  transition: right var(--transition-normal);
  box-shadow: -10px 0 30px rgba(0, 53, 102, 0.15);
  overflow-y: auto;
}

.mobile-drawer.active {
  right: 0;
}

.drawer-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  margin-bottom: 24px;
  padding-bottom: 16px;
  border-bottom: 1px solid var(--border-subtle);
}

.drawer-logo-img {
  height: 72px;
  width: auto;
  max-width: 210px;
  object-fit: contain;
}

.drawer-close-btn {
  background: var(--bg-surface-alt);
  border: 1px solid var(--border-subtle);
  border-radius: 8px;
  color: var(--blue-navy);
  cursor: pointer;
  padding: 8px;
  display: flex;
  align-items: center;
  justify-content: center;
}

.drawer-links {
  display: flex;
  flex-direction: column;
  gap: 8px;
  margin-bottom: 24px;
}

.drawer-link {
  font-size: 1rem;
  font-weight: 600;
  color: var(--text-main);
  padding: 10px 14px;
  border-radius: var(--radius-md);
  transition: all var(--transition-fast);
}

.drawer-link.active, .drawer-link:hover {
  background: var(--bg-surface-alt);
  color: var(--blue-primary);
  border-left: 3px solid var(--blue-primary);
}

.drawer-contact {
  margin-top: auto;
  padding-top: 16px;
  border-top: 1px solid var(--border-subtle);
  font-size: 0.88rem;
  color: var(--text-secondary);
}

/* Breakpoint: Desktop / Laptop (< 1200px) */
@media (max-width: 1200px) {
  .container {
    max-width: 1024px;
  }
  .footer-top-grid {
    grid-template-columns: 1fr 1fr;
    gap: 36px;
  }
  .metrics-grid {
    grid-template-columns: repeat(3, 1fr);
    gap: 18px;
  }
  .metric-item:nth-child(3) {
    border-right: none;
  }
}

/* Breakpoint: Tablet (< 992px) */
@media (max-width: 992px) {
  .nav-menu {
    display: none;
  }
  .nav-search {
    width: 38px;
    flex-shrink: 0;
    overflow: hidden;
    transition: width var(--transition-normal), box-shadow var(--transition-fast);
  }
  .nav-search.is-open {
    position: absolute;
    right: 42px;
    width: 220px !important;
    max-width: calc(100vw - 120px);
    z-index: 2;
  }
  .nav-search-results {
    top: calc(100% + 8px);
    right: 0;
    width: min(300px, calc(100vw - 40px));
  }
  .nav-search-input {
    opacity: 0;
    padding-right: 10px;
    transition: opacity var(--transition-fast);
  }
  .nav-search.is-open .nav-search-input {
    opacity: 1;
  }
  .mobile-toggle-btn {
    display: block;
  }
  .section-hero {
    padding-top: 108px;
    padding-bottom: 50px;
  }
  .section-title {
    font-size: 2.25rem;
  }
  .calc-grid {
    grid-template-columns: 1fr;
  }
  .diag-symptoms-grid {
    grid-template-columns: 1fr 1fr;
  }
  .hero-flex-grid {
    grid-template-columns: 1fr !important;
  }
  .hero-img-col {
    order: -1;
    margin-bottom: 30px;
  }
}

/* Breakpoint: Mobile (< 768px) */
@media (max-width: 768px) {
  .section {
    padding: 44px 0;
  }
  .section-title,
  h1.section-title {
    font-size: 1.9rem !important;
    line-height: 1.2;
    letter-spacing: 0;
  }
  .section-desc {
    font-size: 0.96rem;
    line-height: 1.55;
  }
  .section-header {
    margin-bottom: 28px;
  }
  .section-hero {
    padding-top: 88px;
    padding-bottom: 36px;
  }
  .water-bg {
    padding-top: 76px !important;
  }
  main h2 {
    font-size: 1.55rem !important;
    line-height: 1.25;
    letter-spacing: 0;
  }
  main h2.section-title {
    font-size: 1.55rem !important;
  }
  main h3 {
    font-size: 1.12rem !important;
    line-height: 1.3;
    letter-spacing: 0;
  }
  main h4 {
    font-size: 1rem !important;
    line-height: 1.35;
  }
  .step-header {
    display: block;
  }
  .step-header > * {
    display: block;
    margin-bottom: 4px;
  }
  .step-desc,
  main li,
  main p {
    overflow-wrap: anywhere;
  }
  .hero-visual-image {
    height: 280px !important;
  }
  .hero-visual-caption {
    padding: 16px !important;
  }
  .glass-card {
    padding: 20px !important;
  }
  .btn {
    white-space: normal;
    text-align: center;
  }
  .metrics-grid {
    grid-template-columns: 1fr 1fr;
  }
  .metric-item {
    border-right: none;
    border-bottom: 1px solid rgba(255, 255, 255, 0.06);
  }
  .footer-top-grid {
    grid-template-columns: 1fr;
    gap: 32px;
  }
  .footer-bottom {
    display: grid;
    grid-template-columns: minmax(0, 1fr) minmax(0, 1fr);
    align-items: start;
    justify-content: stretch;
    gap: 12px;
    padding-top: 18px;
    text-align: left;
    font-size: 0.75rem;
    line-height: 1.5;
  }
  .footer-bottom > div {
    min-width: 0;
  }
  .footer-bottom > div:last-child {
    text-align: right;
  }
  .chemical-grid, .industry-grid {
    grid-template-columns: 1fr;
  }
  .about-layout {
    grid-template-columns: 1fr !important;
    gap: 28px !important;
  }
  .core-business-grid {
    grid-template-columns: 1fr;
  }
  .diag-symptoms-grid {
    grid-template-columns: 1fr !important;
  }
  .calc-grid > *,
  .about-layout > * {
    min-width: 0;
  }
  main .calc-grid {
    grid-template-columns: 1fr !important;
    gap: 22px !important;
  }
  main .calc-grid img:not(.site-logo-img):not(.contact-section-logo) {
    height: 220px !important;
  }
  main .calc-grid img.contact-section-logo {
    width: 120px !important;
    height: 80px !important;
    max-width: 120px !important;
    object-fit: contain;
  }
  main .calc-grid [style*="justify-content: space-between"] {
    flex-wrap: wrap;
    gap: 6px;
  }
  [style*="white-space: nowrap"] {
    white-space: normal !important;
  }
  .drawer-contact,
  .footer-contact-info,
  .footer-contact-info li {
    overflow-wrap: anywhere;
    word-break: break-word;
  }
  .modal-header, .modal-body, .modal-footer {
    padding: 20px;
  }
  .tds-specs-table th, .tds-specs-table td {
    padding: 8px 10px;
    font-size: 0.84rem;
  }
  .site-logo-img {
    height: 65px;
    max-width: 190px;
  }
  .nav-wrapper {
    height: 72px;
  }
  .btn-header-cta {
    display: none;
  }
  .floating-hotline {
    bottom: 20px;
    right: 20px;
    padding: 10px 16px;
    font-size: 0.88rem;
  }
}

/* Small Mobile (< 480px) */
@media (max-width: 480px) {
  .metrics-grid {
    grid-template-columns: 1fr;
  }
  .filter-pills {
    justify-content: center;
    row-gap: 8px;
  }
  .filter-btn {
    padding: 7px 10px;
    font-size: 0.78rem;
  }
  .chem-card-actions {
    grid-template-columns: 1fr;
  }
}