/**
 * LINQDOM Global Stylesheet
 * Extracted from: references/Product Page.html
 * All interactive :hover states and component styles
 * Date: 2026-09-03
 */

/* ================================================================
 * 1. GLOBAL RESET & BASE
 * ================================================================ */

*, *::before, *::after {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}

html {
  scroll-behavior: smooth;
}

body {
  color: var(--color-text-dark);
  background-color: var(--color-bg-white);
  line-height: var(--line-height-body);
  font-family: var(--font-family-base);
  font-size: var(--font-size-body);
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

img {
  max-width: 100%;
  display: block;
}

a {
  text-decoration: none;
  color: inherit;
  transition: color 0.2s ease;
}

ul, ol {
  list-style: none;
}

button {
  font-family: var(--font-family-base);
  cursor: pointer;
  border: none;
  background: none;
}

table {
  border-collapse: collapse;
  width: 100%;
}

/* ================================================================
 * 2. LAYOUT
 * ================================================================ */

.container {
  max-width: var(--container-max-width);
  margin-left: auto;
  margin-right: auto;
  padding-left: var(--container-padding-x);
  padding-right: var(--container-padding-x);
}

.section {
  padding-top: var(--section-padding-y);
  padding-bottom: var(--section-padding-y);
}

.section-title {
  text-align: center;
  font-size: var(--font-size-h2);
  font-weight: var(--font-weight-bold);
  letter-spacing: var(--letter-spacing-h2);
  text-transform: var(--text-transform-h2);
  margin-top: var(--section-title-margin-y);
  margin-bottom: 32px;
  color: var(--color-text-dark);
}

/* ================================================================
 * 3. HEADER & NAVIGATION
 * ================================================================ */

header {
  border-bottom: var(--header-border-bottom);
  background: var(--header-bg);
  position: var(--header-position);
  top: var(--header-top);
  z-index: var(--header-z-index);
  transition: var(--transition-base);
}

.nav-bar {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: var(--header-height);
}

/* Logo */
.logo {
  font-weight: var(--font-weight-extrabold);
  font-size: 20px;
  color: var(--color-primary);
  display: flex;
  align-items: center;
  gap: 8px;
  text-decoration: none;
  transition: var(--transition-base);
}

.logo:hover {
  transform: scale(1.03);
  filter: drop-shadow(0 2px 8px var(--color-primary-glow));
}

/* Nav Links */
.nav-links {
  display: flex;
  list-style: none;
  gap: var(--nav-gap);
}

.nav-links a {
  text-decoration: none;
  color: var(--color-text-dark);
  font-size: var(--nav-link-font-size);
  font-weight: var(--nav-link-font-weight);
  position: relative;
  padding: 6px 0;
  transition: color 0.2s;
}

.nav-links a::after {
  content: "";
  position: absolute;
  bottom: 0;
  left: 50%;
  width: var(--nav-underline-width-0);
  height: var(--nav-underline-height);
  background: var(--color-primary);
  transition: var(--transition-base);
  transform: var(--nav-underline-transform);
}

.nav-links a:hover {
  color: var(--color-primary);
}

.nav-links a:hover::after {
  width: var(--nav-underline-width-100);
}

/* Nav Actions */
.nav-actions {
  display: flex;
  align-items: center;
  gap: 16px;
}

/* ================================================================
 * 4. BUTTON SYSTEM
 * ================================================================ */

/* Primary Button */
.btn-primary {
  background: var(--btn-primary-bg);
  color: var(--btn-primary-color);
  border: 1px solid var(--btn-primary-border);
  padding: var(--btn-padding-y) var(--btn-padding-x);
  border-radius: var(--btn-border-radius);
  font-size: var(--font-size-btn);
  font-weight: var(--font-weight-btn);
  cursor: pointer;
  display: inline-flex;
  align-items: center;
  gap: 8px;
  transition: var(--transition-base);
  font-family: var(--font-family-base);
}

.btn-primary:hover {
  background: var(--btn-primary-bg-hover);
  border-color: var(--btn-primary-border-hover);
  transform: var(--translate-y-hover-sm);
  box-shadow: var(--shadow-btn-primary-hover);
}

.btn-primary:active {
  transform: var(--translate-y-hover-sm) scale(0.98);
}

/* Outline Button */
.btn-outline {
  background: var(--btn-outline-bg);
  color: var(--btn-outline-color);
  border: 1px solid var(--btn-outline-border);
  padding: var(--btn-padding-y) var(--btn-padding-x);
  border-radius: var(--btn-border-radius);
  font-size: var(--font-size-btn);
  font-weight: var(--font-weight-btn);
  cursor: pointer;
  display: inline-flex;
  align-items: center;
  gap: 8px;
  transition: var(--transition-base);
  font-family: var(--font-family-base);
}

.btn-outline:hover {
  border-color: var(--btn-outline-border-hover);
  color: var(--btn-outline-color-hover);
  background: var(--btn-outline-bg-hover);
  transform: var(--translate-y-hover-sm);
  box-shadow: 0 4px 12px rgba(0, 0, 0, 0.05);
}

.btn-outline:active {
  transform: var(--translate-y-hover-sm) scale(0.98);
}

/* Pill Contact Button */
.btn-contact {
  background: var(--color-primary);
  color: #fff;
  border: none;
  padding: var(--btn-pill-padding);
  border-radius: var(--btn-pill-radius);
  font-size: var(--btn-pill-font-size);
  font-weight: var(--btn-pill-font-weight);
  cursor: pointer;
  transition: var(--transition-base);
  font-family: var(--font-family-base);
}

.btn-contact:hover {
  background: var(--color-primary-hover);
  transform: var(--translate-y-hover-sm);
  box-shadow: 0 4px 12px var(--color-primary-glow);
}

/* ================================================================
 * 5. BREADCRUMBS
 * ================================================================ */

.breadcrumbs {
  font-size: var(--breadcrumb-font-size);
  color: var(--breadcrumb-color);
  padding: var(--breadcrumb-padding);
}

.breadcrumbs a {
  color: var(--breadcrumb-color);
  text-decoration: none;
  transition: color 0.2s;
}

.breadcrumbs a:hover {
  color: var(--color-primary);
}

.breadcrumbs span {
  margin: var(--breadcrumb-separator-margin);
}

/* ================================================================
 * 6. HERO SECTION
 * ================================================================ */

.hero-section {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: var(--hero-grid-gap);
  align-items: center;
  padding: 24px 0 var(--section-padding-y);
}

.badge-5kwh {
  color: var(--color-primary);
  font-size: 32px;
  font-weight: 800;
  line-height: 1.1;
  display: inline-block;
  transition: var(--transition-base);
}

.badge-5kwh:hover {
  transform: scale(1.05);
  text-shadow: 0 2px 10px var(--color-primary-glow);
}

.hero-title {
  font-size: var(--font-size-h1);
  font-weight: var(--font-weight-extrabold);
  line-height: var(--line-height-h1);
  margin: 8px 0 16px;
}

.hero-desc {
  color: var(--color-text-muted);
  font-size: var(--font-size-body);
  margin-bottom: 24px;
}

.hero-cta {
  display: flex;
  gap: 16px;
  margin-bottom: 28px;
}

.hero-highlights {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: var(--grid-gap);
  border-top: 1px solid var(--color-border);
  padding-top: 20px;
}

.highlight-item {
  font-size: 12px;
  color: var(--color-text-muted);
  display: flex;
  align-items: center;
  gap: 6px;
  cursor: default;
  transition: var(--transition-base);
}

.highlight-item i {
  color: var(--color-primary);
  transition: var(--transition-icon);
}

.highlight-item:hover {
  color: var(--color-text-dark);
  transform: var(--translate-y-hover-sm);
}

.highlight-item:hover i {
  transform: var(--scale-hover-icon-md);
}

/* Hero Image Box */
.hero-image-box {
  border-radius: var(--hero-image-border-radius);
  overflow: hidden;
  background: #e2e8f0;
  display: flex;
  align-items: center;
  justify-content: center;
  min-height: var(--hero-image-min-height);
  transition: var(--transition-base);
  box-shadow: var(--shadow-card);
}

.hero-image-box:hover {
  transform: var(--translate-y-hover);
  box-shadow: var(--shadow-card-hover);
}

.hero-image-box img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  display: block;
  transition: var(--transition-image-zoom-hero);
}

.hero-image-box:hover img {
  transform: var(--scale-hover);
}

/* ================================================================
 * 7. CORE SPECS BAR
 * ================================================================ */

.specs-bar {
  display: grid;
  grid-template-columns: repeat(7, 1fr);
  gap: var(--spec-bar-gap);
  padding: 24px 0;
  border-top: 1px solid var(--color-border);
  border-bottom: 1px solid var(--color-border);
  text-align: center;
}

.spec-node {
  padding: var(--spec-node-padding);
  border-radius: var(--card-border-radius);
  cursor: default;
  transition: var(--transition-base);
}

.spec-node:hover {
  background: var(--color-bg-section);
  transform: var(--translate-y-hover-md);
  box-shadow: 0 4px 12px rgba(0, 0, 0, 0.04);
}

.spec-node i {
  font-size: var(--spec-node-icon-size);
  color: var(--spec-node-icon-color);
  margin-bottom: 6px;
  transition: var(--transition-icon);
}

.spec-node:hover i {
  transform: var(--scale-hover-icon-md);
}

.spec-node .val {
  font-size: 15px;
  font-weight: 700;
  display: block;
}

.spec-node .lbl {
  font-size: 11px;
  color: var(--color-text-muted);
}

/* ================================================================
 * 8. FEATURE CARDS (6-column grid)
 * ================================================================ */

.features-grid {
  display: grid;
  grid-template-columns: repeat(6, 1fr);
  gap: var(--grid-gap-md);
}

.feature-card {
  border: var(--feature-card-border);
  border-radius: var(--feature-card-radius);
  padding: var(--feature-card-padding);
  text-align: var(--feature-card-text-align);
  background: var(--color-bg-card);
  transition: var(--transition-base);
}

.feature-card:hover {
  transform: var(--translate-y-hover-lg);
  border-color: var(--color-primary);
  box-shadow: var(--shadow-card-glow);
}

.feature-card i {
  font-size: var(--feature-card-icon-size);
  color: var(--feature-card-icon-color);
  margin-bottom: var(--feature-card-icon-margin-bottom);
  transition: var(--transition-icon);
}

.feature-card:hover i {
  transform: var(--scale-hover-icon);
}

.feature-card h4 {
  font-size: var(--font-size-h4);
  font-weight: var(--font-weight-bold);
  margin-bottom: var(--margin-bottom-h4);
}

.feature-card p {
  font-size: var(--font-size-tiny);
  color: var(--color-text-muted);
  line-height: 1.4;
}

/* ================================================================
 * 9. TECHNICAL SPEC TABLE
 * ================================================================ */

.tech-table {
  width: 100%;
  border-collapse: collapse;
  border: var(--spec-table-border);
  font-size: var(--spec-table-font-size);
  border-radius: var(--spec-table-radius);
  overflow: hidden;
}

.tech-table tr {
  transition: var(--spec-table-row-transition);
}

.tech-table tr:hover {
  background-color: var(--spec-table-row-hover-bg);
}

.tech-table td {
  padding: var(--spec-table-cell-padding);
  border-bottom: 1px solid var(--color-border);
}

.tech-table td:nth-child(odd) {
  font-weight: var(--font-weight-semibold);
  background: var(--spec-table-label-bg);
  width: var(--spec-table-label-width);
  border-right: var(--spec-table-label-border-r);
  transition: background-color 0.2s ease, color 0.2s ease;
}

.tech-table tr:hover td:nth-child(odd) {
  background-color: rgba(12, 166, 138, 0.05);
  color: var(--color-primary);
}

.tech-table td:nth-child(even) {
  width: 25%;
  color: #334155;
}

.tech-table td:nth-child(2) {
  border-right: 1px solid var(--color-border);
}

/* ================================================================
 * 10. INVERTER COMPATIBILITY SECTION
 * ================================================================ */

.compat-wrapper {
  display: grid;
  grid-template-columns: 2fr 1fr;
  gap: var(--grid-gap-xl);
  align-items: stretch;
}

.compat-table {
  width: 100%;
  border-collapse: collapse;
  border: var(--compat-table-border);
  font-size: var(--compat-table-font-size);
  text-align: left;
  border-radius: var(--compat-table-radius);
  overflow: hidden;
}

.compat-table th,
.compat-table td {
  padding: var(--compat-table-cell-padding);
  border-bottom: 1px solid var(--color-border);
}

.compat-table th {
  background: var(--compat-table-header-bg);
  font-weight: var(--compat-table-header-weight);
}

.compat-table tbody tr {
  transition: var(--spec-table-row-transition);
}

.compat-table tbody tr:hover {
  background-color: var(--compat-table-row-hover-bg);
}

/* Compatibility Card (right side) */
.compat-card {
  border: 1px solid var(--color-border);
  border-radius: var(--compat-table-radius);
  padding: 32px 20px;
  text-align: center;
  background: var(--color-bg-section);
  display: flex;
  flex-direction: column;
  justify-content: center;
  transition: var(--transition-base);
}

.compat-card:hover {
  border-color: var(--color-primary);
  box-shadow: 0 8px 24px rgba(0, 0, 0, 0.05);
  transform: var(--translate-y-hover-sm);
}

.compat-card h4 {
  font-size: 15px;
  margin-bottom: 8px;
}

.compat-card p {
  font-size: 12px;
  color: var(--color-text-muted);
  margin-bottom: 16px;
}

/* ================================================================
 * 11. FULL-WIDTH VIDEO SECTION
 * ================================================================ */

.full-width-video {
  width: 100vw;
  position: relative;
  left: 50%;
  right: 50%;
  margin-left: -50vw;
  margin-right: -50vw;
  margin-top: var(--section-title-margin-y);
  margin-bottom: var(--section-title-margin-y);
  background: var(--color-dark-bg);
  overflow: hidden;
}

.video-container {
  position: relative;
  width: 100%;
  height: var(--video-section-height);
}

.video-container video {
  width: 100%;
  height: 100%;
  object-fit: cover;
  display: block;
  filter: brightness(0.65);
  transition: filter 0.5s ease;
}

.full-width-video:hover .video-container video {
  filter: brightness(0.75);
}

.video-overlay {
  position: absolute;
  inset: 0;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  text-align: center;
  color: #ffffff;
  padding: var(--video-overlay-padding);
  background: var(--color-video-overlay);
  transition: background 0.3s ease;
}

.full-width-video:hover .video-overlay {
  background: var(--color-video-overlay-hover);
}

/* Video Play Button */
.video-play-btn {
  width: var(--video-btn-size);
  height: var(--video-btn-size);
  border-radius: var(--video-btn-radius);
  background: var(--video-btn-bg);
  border: var(--video-btn-border);
  color: #ffffff;
  font-size: var(--video-btn-icon-size);
  display: flex;
  align-items: center;
  justify-content: center;
  cursor: pointer;
  margin-bottom: 20px;
  box-shadow: var(--video-btn-box-shadow);
  transition: var(--transition-base);
}

.video-play-btn i {
  margin-left: var(--video-play-icon-margin-left);
  transition: transform 0.2s ease;
}

.video-play-btn:hover {
  transform: scale(1.12);
  background: var(--video-btn-bg-hover);
  box-shadow: 0 0 32px rgba(12, 166, 138, 0.9);
}

.video-play-btn:hover i {
  transform: var(--scale-hover-icon);
}

.video-overlay h3 {
  font-size: 30px;
  font-weight: var(--font-weight-extrabold);
  letter-spacing: 0.02em;
  margin-bottom: 8px;
}

.video-overlay p {
  font-size: var(--font-size-body);
  color: #e2e8f0;
  max-width: 620px;
}

/* ================================================================
 * 12. APPLICATION CARDS (4-column grid)
 * ================================================================ */

.app-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: var(--grid-gap-lg);
}

.app-card {
  border: var(--app-card-border);
  border-radius: var(--app-card-radius);
  overflow: var(--app-card-overflow);
  background: var(--color-bg-card);
  transition: var(--transition-base);
}

.app-card:hover {
  transform: var(--translate-y-hover-lg);
  border-color: var(--color-primary);
  box-shadow: 0 12px 24px rgba(0, 0, 0, 0.08);
}

.app-card img {
  width: 100%;
  height: var(--app-card-img-height);
  object-fit: var(--app-card-img-object-fit);
  display: block;
  background: #cbd5e1;
  transition: var(--transition-image-zoom);
}

.app-card:hover img {
  transform: scale(1.08);
}

.app-card-body {
  padding: 14px;
  text-align: center;
}

.app-card-body h4 {
  font-size: 13px;
  font-weight: var(--font-weight-bold);
  margin-bottom: 6px;
  transition: color 0.2s ease;
}

.app-card:hover .app-card-body h4 {
  color: var(--color-primary);
}

.app-card-body p {
  font-size: var(--font-size-tiny);
  color: var(--color-text-muted);
}

/* ================================================================
 * 12.5 APPLICATION SCENARIO CARDS
 *      每个应用场景：上方正方形配图 + 下方文案（图在上、文在下 1:1）
 * ================================================================ */
.app-scenarios {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: var(--grid-gap-lg);
}

.app-scenario {
  display: flex;
  flex-direction: column;
}

/* 正方形相框 */
.app-frame {
  position: relative;
  width: 100%;
  aspect-ratio: 1 / 1;
  overflow: hidden;
  border-radius: var(--app-card-radius);
  border: 1px solid var(--app-card-border, var(--color-border));
  background: var(--color-bg-section);
}

.app-frame img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  display: block;
  transition: var(--transition-image-zoom);
}

.app-frame:hover img {
  transform: scale(1.08);
}

/* 未上传图片时的占位相框 */
.app-frame-ph {
  display: flex;
  align-items: center;
  justify-content: center;
  width: 100%;
  height: 100%;
  background: repeating-linear-gradient(45deg, #e2e8f0, #e2e8f0 12px, #eef2f7 12px, #eef2f7 24px);
  color: #94a3b8;
  font-size: 22px;
}

/* 相框下方的应用场景文案 */
.app-scenario-text {
  display: flex;
  align-items: flex-start;
  gap: 8px;
  margin-top: 14px;
  font-size: var(--font-size-small);
  line-height: 1.6;
  color: var(--color-text-muted);
}

.app-scenario-text > i {
  color: var(--color-primary);
  flex: none;
  margin-top: 4px;
}

/* 应用名称 + 其下方的说明文字（应用1~4 各自的说明） */
.app-scenario-text__body {
  display: flex;
  flex-direction: column;
  gap: 3px;
  min-width: 0;
}

.app-scenario-text__desc {
  font-size: 12px;
  line-height: 1.55;
  color: #94a3b8;
}

/* 响应式列数 */
@media (max-width: 768px) {
  .app-scenarios { grid-template-columns: repeat(2, 1fr); }
}

@media (max-width: 480px) {
  .app-scenarios { grid-template-columns: 1fr; }
}

/* ================================================================
 * 13. INSTALLATION FLOW
 * ================================================================ */

.install-flow {
  display: flex;
  justify-content: space-between;
  align-items: flex-start;
  position: relative;
}

.install-step {
  text-align: center;
  flex: 1;
  padding: 8px 6px;
  position: relative;
  border-radius: var(--card-border-radius);
  cursor: default;
  transition: var(--transition-base);
}

.install-step:hover {
  background: var(--color-bg-section);
  transform: var(--translate-y-hover-sm);
}

.install-step i {
  font-size: var(--install-step-icon-size);
  color: var(--install-step-icon-color);
  margin-bottom: var(--install-step-icon-margin-bottom);
  transition: var(--transition-icon);
}

.install-step:hover i {
  transform: var(--scale-hover-icon-lg);
}

.install-step h5 {
  font-size: var(--font-size-h5);
  font-weight: var(--font-weight-bold);
  margin-bottom: 4px;
}

.install-step p {
  font-size: var(--font-size-tiny);
  color: var(--color-text-muted);
}

.install-step:not(:last-child)::after {
  content: var(--install-arrow);
  position: var(--install-arrow-position);
  right: var(--install-arrow-right);
  top: var(--install-arrow-top);
  font-size: var(--install-arrow-size);
  color: var(--install-arrow-color);
}

/* ================================================================
 * 14. CERTIFICATIONS ROW
 * ================================================================ */

.cert-row {
  display: flex;
  justify-content: space-between;
  align-items: center;
  background: var(--cert-row-bg);
  padding: var(--cert-row-padding);
  border-radius: var(--card-border-radius);
  border: 1px solid var(--color-border);
  transition: var(--transition-base);
}

.cert-row:hover {
  border-color: var(--color-primary);
  box-shadow: 0 6px 20px rgba(0, 0, 0, 0.04);
}

.cert-logos {
  display: flex;
  gap: 20px;
  align-items: center;
}

/* Certification Tags */
.cert-tag {
  font-weight: var(--font-weight-extrabold);
  font-size: var(--cert-tag-font-size);
  border: var(--cert-tag-border);
  border-radius: var(--cert-tag-border-radius);
  padding: var(--cert-tag-padding);
  color: var(--cert-tag-color);
  background: var(--cert-tag-bg);
  cursor: default;
  transition: var(--transition-base);
}

.cert-tag:hover {
  border-color: var(--color-primary);
  color: var(--color-primary);
  transform: var(--translate-y-hover-md);
  box-shadow: 0 4px 10px var(--color-primary-glow);
}

/* Certification List */
.cert-list {
  list-style: none;
  font-size: var(--font-size-caption);
}

.cert-list li {
  margin-bottom: 4px;
  display: flex;
  align-items: center;
  gap: 6px;
  color: #334155;
  transition: color 0.2s ease;
}

.cert-list li:hover {
  color: var(--color-text-dark);
}

.cert-list i {
  color: var(--color-primary);
}

/* ================================================================
 * 15. DOWNLOAD CARDS (6-column grid)
 * ================================================================ */

.dl-grid {
  display: grid;
  grid-template-columns: repeat(6, 1fr);
  gap: var(--grid-gap-md);
}

.dl-card {
  border: var(--dl-card-border);
  border-radius: var(--dl-card-radius);
  padding: var(--dl-card-padding);
  text-align: center;
  text-decoration: none;
  color: var(--color-text-dark);
  display: block;
  background: var(--color-bg-card);
  transition: var(--transition-base);
}

.dl-card:hover {
  border-color: var(--color-primary);
  background: var(--color-primary-light);
  transform: var(--translate-y-hover-sm);
  box-shadow: 0 6px 16px var(--color-primary-glow);
}

.dl-card i {
  font-size: var(--dl-card-icon-size);
  color: var(--dl-card-icon-color);
  margin-bottom: 6px;
  transition: var(--transition-icon);
}

.dl-card:hover i {
  transform: var(--scale-hover-icon);
}

.dl-card .title {
  font-size: var(--font-size-caption);
  font-weight: var(--font-weight-semibold);
  display: block;
}

.dl-card .ext {
  font-size: 10px;
  color: var(--color-text-muted);
}

/* ================================================================
 * 16. FAQ ITEMS (2-column grid)
 * ================================================================ */

.faq-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: var(--grid-gap-md);
  align-items: start; /* 防止展开左侧时同排右侧被拉伸 */
}

.faq-item {
  border: var(--faq-item-border);
  border-radius: var(--faq-item-radius);
  padding: var(--faq-item-padding);
  display: flex;
  justify-content: var(--faq-item-justify);
  align-items: var(--faq-item-align-items);
  font-size: var(--faq-item-font-size);
  font-weight: var(--faq-item-font-weight);
  cursor: pointer;
  background: var(--color-bg-card);
  transition: var(--transition-base);
}

.faq-item:hover {
  border-color: var(--color-primary);
  background: var(--color-primary-light);
  transform: var(--translate-x-hover);
  color: var(--color-primary);
}

.faq-item i {
  transition: transform 0.3s ease;
}

.faq-item:hover i {
  transform: translateY(2px);
}

/* ================================================================
 * FAQ 手风琴（.wm-faq-*）— 全站统一问答形式，与 wall-mounted 一致
 * 点击问题行展开/收起答案，同一时刻仅展开一项，箭头旋转 180°
 * ================================================================ */
.wm-faq{max-width:1100px;margin:0 auto;}
.wm-faq-item{border:var(--faq-item-border,1px solid #e2e8f0);border-radius:var(--faq-item-radius,10px);background:var(--color-bg-card,#fff);overflow:hidden;box-shadow:0 1px 2px rgba(15,23,42,.05);transition:border-color .2s ease;}
.wm-faq-item.open{border-color:var(--color-primary);}
.wm-faq-q{width:100%;display:flex;justify-content:space-between;align-items:center;gap:12px;padding:16px 18px;background:none;border:0;cursor:pointer;font:inherit;font-size:var(--faq-item-font-size,15px);font-weight:var(--faq-item-font-weight,600);color:var(--color-text-dark,#1e293b);text-align:left;transition:color .2s ease;}
.wm-faq-q:hover{color:var(--color-primary);}
.wm-faq-ico{flex-shrink:0;font-size:13px;color:var(--color-text-muted,#64748b);transition:transform .25s ease;}
.wm-faq-item.open .wm-faq-ico{transform:rotate(180deg);color:var(--color-primary);}
.wm-faq-a{display:none;padding:12px 18px 16px;border-top:1px solid var(--color-border,#e2e8f0);color:var(--color-text-muted,#64748b);line-height:1.7;font-size:14px;font-weight:400;}
.wm-faq-item.open .wm-faq-a{display:block;}

/* 两列独立容器：展开左列条目时右列不移动、不被拉伸 */
.wm-faq-cols{display:flex;gap:12px;align-items:flex-start;max-width:1100px;margin:0 auto;}
.wm-faq-col{flex:1 1 0;min-width:0;display:flex;flex-direction:column;gap:12px;}
@media (max-width:768px){.wm-faq-cols{flex-direction:column;}}

/* ================================================================
 * 17. PRODUCT RECOMMENDATION CARDS (4-column grid)
 * ================================================================ */

.products-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: var(--grid-gap-lg);
}

.prod-card {
  border: var(--prod-card-border);
  border-radius: var(--prod-card-radius);
  padding: var(--card-padding-sm);
  text-align: center;
  background: var(--color-bg-card);
  transition: var(--transition-base);
}

.prod-card:hover {
  border-color: var(--color-primary);
  transform: var(--translate-y-hover-lg);
  box-shadow: 0 10px 24px rgba(0, 0, 0, 0.08);
}

.prod-card img {
  width: 100%;
  height: var(--prod-card-img-height);
  object-fit: var(--prod-card-img-object-fit);
  margin-bottom: 12px;
  transition: transform 0.4s ease;
}

.prod-card:hover img {
  transform: scale(1.06);
}

.prod-card h5 {
  font-size: var(--font-size-caption);
  margin-bottom: 8px;
  transition: color 0.2s ease;
}

.prod-card:hover h5 {
  color: var(--color-primary);
}

/* ================================================================
 * 18. CTA BANNER  (from references/linqdom-footer.html)
 * ================================================================ */
.cta-banner {
  background: #0b1a2d;
  border: 1px solid #162842;
  border-radius: 12px;
  padding: 24px 32px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 20px;
  margin-top: 0;
  margin-bottom: 48px;
}
.cta-banner:hover {
  border-color: #1e3a5f;
  box-shadow: none;
}
.cta-banner h3 {
  font-size: 18px;
  margin-bottom: 4px;
  color: #ffffff;
}
.cta-banner p {
  font-size: 13px;
  color: #94a3b8;
}

/* ================================================================
 * 19. FOOTER  (from references/linqdom-footer.html)
 * ================================================================ */
.footer-wrapper {
  background-color: #061120;
  color: #94a3b8;
  padding: 40px 24px 20px;
  font-size: 13px;
}
.footer-container {
  max-width: 1240px;
  margin: 0 auto;
}
/* CTA Banner inside footer wrapper */
.cta-banner {
  background: #0b1a2d;
  border: 1px solid #162842;
  border-radius: 12px;
  padding: 24px 32px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 20px;
  margin-bottom: 48px;
}
.cta-banner:hover {
  border-color: #1e3a5f;
}
.cta-left {
  display: flex;
  align-items: center;
  gap: 20px;
}
.cta-icon {
  width: 48px;
  height: 48px;
  border-radius: 8px;
  background: rgba(14, 165, 163, 0.12);
  border: 1px solid rgba(14, 165, 163, 0.25);
  display: flex;
  align-items: center;
  justify-content: center;
  color: #00d2b4;
  flex-shrink: 0;
}
.cta-text h3 {
  color: #ffffff;
  font-size: 18px;
  font-weight: 700;
  margin-bottom: 4px;
}
.cta-text p {
  color: #94a3b8;
  font-size: 13px;
}
.cta-buttons {
  display: flex;
  gap: 16px;
  flex-shrink: 0;
}
.footer-wrapper .btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  padding: 10px 22px;
  font-size: 13px;
  font-weight: 600;
  border-radius: 6px;
  text-decoration: none;
  cursor: pointer;
  transition: all 0.2s ease;
}
.footer-wrapper .btn-primary {
  background-color: #00baa3;
  color: #ffffff;
  border: 1px solid #00baa3;
}
.footer-wrapper .btn-primary:hover {
  background-color: #00a08c;
  border-color: #00a08c;
  color: #ffffff;
}
.footer-wrapper .btn-outline {
  background-color: transparent;
  color: #ffffff;
  border: 1px solid #233b5c;
}
.footer-wrapper .btn-outline:hover {
  border-color: #00baa3;
  color: #00baa3;
  background-color: rgba(0, 186, 163, 0.08);
}
/* Main Navigation Grid */
.footer-main {
  display: grid;
  grid-template-columns: 1.5fr 1.1fr 1.1fr 1.1fr 1fr 1fr;
  gap: 32px;
  margin-bottom: 48px;
}
.brand-col {
  padding-right: 16px;
}
.brand-logo {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  margin-bottom: 24px;
  text-decoration: none;
  flex-wrap: nowrap;
}
.logo-text-wrap {
  /* 横向中英文 LOGO：LINQDOM | 联创域 */
  display: inline-flex;
  align-items: center;
  gap: 10px;
}
.logo-text {
  font-size: 20px;
  font-weight: 800;
  letter-spacing: 1.5px;
  color: #00d2b4;
  line-height: 1.1;
  white-space: nowrap;
}
.logo-divider {
  display: inline-block;
  width: 1px;
  height: 18px;
  background: rgba(255, 255, 255, 0.25);
}
.logo-subtext {
  font-size: 15px;
  letter-spacing: 2px;
  color: #00d2b4;
  font-weight: 600;
  line-height: 1.1;
  white-space: nowrap;
}
/* 页脚 LOGO 图片（后台上传：系统配置 → 基本配置 → Website LOGO） */
.brand-logo-img {
  display: block;
  height: 42px;
  width: auto;
  max-width: 260px;
  object-fit: contain;
}
@media (max-width: 768px) {
  .brand-logo-img {
    height: 34px;
  }
}
.brand-col h4 {
  color: #ffffff;
  font-size: 13px;
  font-weight: 700;
  margin-bottom: 4px;
}
.brand-tagline {
  color: #64748b;
  font-size: 12px;
  margin-bottom: 16px;
}
.brand-desc {
  color: #8395a7;
  font-size: 12px;
  line-height: 1.6;
  margin-bottom: 24px;
}
.social-links {
  display: flex;
  gap: 12px;
}
.social-btn {
  width: 32px;
  height: 32px;
  border-radius: 6px;
  background: #0e1e32;
  border: 1px solid #1a2f4c;
  display: flex;
  align-items: center;
  justify-content: center;
  color: #cbd5e1;
  text-decoration: none;
  transition: all 0.2s ease;
}
.social-btn:hover {
  background: #00baa3;
  border-color: #00baa3;
  color: #ffffff;
}
.link-col h5 {
  color: #ffffff;
  font-size: 13px;
  font-weight: 700;
  letter-spacing: 0.8px;
  text-transform: uppercase;
  margin-bottom: 24px;
}
.link-list {
  list-style: none;
  display: flex;
  flex-direction: column;
  gap: 14px;
}
.link-list a {
  color: #8da2bb;
  text-decoration: none;
  font-size: 12.5px;
  display: inline-flex;
  align-items: center;
  justify-content: space-between;
  width: 100%;
  transition: color 0.2s ease;
}
.link-list a:hover {
  color: #00d2b4;
}
.link-list a .arrow {
  color: #475569;
  font-size: 11px;
  font-weight: bold;
  transition: transform 0.2s ease, color 0.2s ease;
  margin-left: 6px;
}
.link-list a:hover .arrow {
  color: #00d2b4;
  transform: translateX(2px);
}
/* Trust & Newsletter Row */
.features-newsletter-row {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 24px;
  padding: 24px 0;
  border-top: 1px solid #14243b;
  border-bottom: 1px solid #14243b;
  margin-bottom: 24px;
}
.feature-items {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 24px;
  flex: 1;
}
.feature-item {
  display: flex;
  align-items: flex-start;
  gap: 12px;
}
.feature-icon {
  width: 32px;
  height: 32px;
  color: #00baa3;
  flex-shrink: 0;
  display: flex;
  align-items: center;
  justify-content: center;
}
.feature-info h6 {
  color: #ffffff;
  font-size: 12.5px;
  font-weight: 600;
  margin-bottom: 2px;
}
.feature-info p {
  color: #64748b;
  font-size: 11px;
  line-height: 1.4;
}
.newsletter-block {
  width: 380px;
  flex-shrink: 0;
}
.newsletter-block h6 {
  color: #ffffff;
  font-size: 12.5px;
  font-weight: 600;
  margin-bottom: 2px;
}
.newsletter-block p {
  color: #64748b;
  font-size: 11px;
  margin-bottom: 8px;
}
.newsletter-form {
  display: flex;
  background: #091728;
  border: 1px solid #1b2f4a;
  border-radius: 6px;
  overflow: hidden;
}
.newsletter-input {
  flex: 1;
  background: transparent;
  border: none;
  padding: 9px 12px;
  color: #fff;
  font-size: 12px;
  outline: none;
}
.newsletter-input::placeholder {
  color: #52637a;
}
.newsletter-btn {
  background: #00baa3;
  border: none;
  padding: 0 14px;
  display: flex;
  align-items: center;
  justify-content: center;
  color: #ffffff;
  cursor: pointer;
  transition: background 0.2s;
}
.newsletter-btn:hover {
  background: #00a08c;
}
/* Footer Bottom */
.footer-bottom {
  display: flex;
  align-items: center;
  justify-content: space-between;
  color: #64748b;
  font-size: 11.5px;
  padding-top: 4px;
}
.bottom-links {
  display: flex;
  gap: 16px;
  align-items: center;
}
.bottom-links a {
  color: #64748b;
  text-decoration: none;
  transition: color 0.2s;
}
.bottom-links a:hover {
  color: #94a3b8;
}
.bottom-links .divider {
  color: #233854;
}
.lang-selector {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  color: #cbd5e1;
  cursor: pointer;
  font-weight: 500;
  padding: 4px 8px;
  border-radius: 4px;
  transition: background 0.2s;
}
.lang-selector:hover {
  background: #0d1e33;
}
@media (max-width: 1024px) {
  .footer-main {
    grid-template-columns: repeat(3, 1fr);
    gap: 32px 20px;
  }
  .brand-col {
    grid-column: span 3;
  }
  .features-newsletter-row {
    flex-direction: column;
    align-items: stretch;
  }
  .feature-items {
    grid-template-columns: repeat(2, 1fr);
  }
  .newsletter-block {
    width: 100%;
  }
}
@media (max-width: 768px) {
  .cta-banner {
    flex-direction: column;
    text-align: center;
    align-items: center;
  }
  .cta-left {
    flex-direction: column;
  }
  .footer-main {
    grid-template-columns: 1fr 1fr;
  }
  .brand-col {
    grid-column: span 2;
  }
  .feature-items {
    grid-template-columns: 1fr;
  }
  .footer-bottom {
    flex-direction: column;
    gap: 14px;
    text-align: center;
  }
  .bottom-links {
    flex-wrap: wrap;
    justify-content: center;
  }
}

/* ================================================================
 * 20. UTILITY CLASSES
 * ================================================================ */

.text-primary { color: var(--color-primary); }
.text-muted   { color: var(--color-text-muted); }
.text-dark    { color: var(--color-text-dark); }
.text-center  { text-align: center; }

.bg-light     { background-color: var(--color-bg-section); }
.bg-white     { background-color: var(--color-bg-white); }

.flex         { display: flex; }
.flex-center  { display: flex; align-items: center; justify-content: center; }
.gap-sm      { gap: 8px; }
.gap-md      { gap: 16px; }

.mt-sm  { margin-top: 8px; }
.mt-md  { margin-top: 16px; }
.mt-lg  { margin-top: 24px; }
.mb-sm  { margin-bottom: 8px; }
.mb-md  { margin-bottom: 16px; }
.mb-lg  { margin-bottom: 24px; }

.visually-hidden {
  position: absolute;
  width: 1px;
  height: 1px;
  padding: 0;
  margin: -1px;
  overflow: hidden;
  clip: rect(0, 0, 0, 0);
  white-space: nowrap;
  border: 0;
}

/* ================================================================
 * 21. WCAG-AA BUTTON SAFETY OVERRIDES (FIX white-on-white bug)
 *     Default = DARK text on white/transparent backgrounds.
 *     Hover = primary color with soft tint background.
 *     These rules intentionally override any inline or older CSS
 *     that set button text to #ffffff on a light surface.
 * ================================================================ */

/* 21.1  .btn-secondary — solid muted gray surface */
.btn-secondary {
  background-color: var(--btn-secondary-bg);
  color: var(--btn-secondary-color);
  border: 1px solid var(--btn-secondary-border);
  padding: var(--btn-padding-y) var(--btn-padding-x);
  border-radius: var(--btn-border-radius);
  font-size: var(--font-size-btn);
  font-weight: var(--font-weight-btn);
  cursor: pointer;
  display: inline-flex;
  align-items: center;
  gap: 8px;
  transition: var(--transition-base);
  font-family: var(--font-family-base);
}
.btn-secondary:hover {
  background-color: var(--btn-secondary-bg-hover);
  color: var(--btn-secondary-color-hover);
  border-color: var(--btn-secondary-border-hover);
  transform: var(--translate-y-hover-sm);
  box-shadow: 0 4px 12px rgba(0, 0, 0, 0.05);
}

/* 21.2  .btn-white — white card-style button on dark surfaces */
.btn-white {
  background-color: var(--btn-white-bg);
  color: var(--btn-white-color);
  border: 1px solid var(--btn-white-border);
  padding: var(--btn-padding-y) var(--btn-padding-x);
  border-radius: var(--btn-border-radius);
  font-size: var(--font-size-btn);
  font-weight: var(--font-weight-btn);
  cursor: pointer;
  display: inline-flex;
  align-items: center;
  gap: 8px;
  transition: var(--transition-base);
  font-family: var(--font-family-base);
}
.btn-white:hover {
  background-color: var(--btn-white-bg-hover);
  color: var(--btn-white-color-hover);
  border-color: var(--btn-white-border-hover);
  transform: var(--translate-y-hover-sm);
  box-shadow: 0 6px 16px rgba(0, 0, 0, 0.08);
}

/* 21.3  .btn-ghost — borderless, brand-primary text on light bg */
.btn-ghost {
  background-color: var(--btn-ghost-bg);
  color: var(--btn-ghost-color);
  border: 1px solid var(--btn-ghost-border);
  padding: var(--btn-padding-y) var(--btn-padding-x);
  border-radius: var(--btn-border-radius);
  font-size: var(--font-size-btn);
  font-weight: var(--font-weight-semibold);
  cursor: pointer;
  display: inline-flex;
  align-items: center;
  gap: 8px;
  transition: var(--transition-base);
  font-family: var(--font-family-base);
}
.btn-ghost:hover {
  background-color: var(--btn-ghost-bg-hover);
  color: var(--btn-ghost-color-hover);
  border-color: var(--btn-ghost-border-hover);
  transform: var(--translate-y-hover-sm);
}

/* 21.4  Un-classed buttons / anchors with role=button — safety default */
button:not([class]),
a[role="button"]:not([class]) {
  color: var(--color-text-dark);
  background-color: #ffffff;
  border: 1px solid var(--color-border);
  padding: 8px 16px;
  border-radius: var(--btn-border-radius);
  font-family: var(--font-family-base);
  font-size: var(--font-size-btn);
  font-weight: var(--font-weight-btn);
  cursor: pointer;
}

/* 21.5  Buttons INSIDE cards / specs — guarantee readability */
.card .btn-outline,
.card .btn-secondary,
.card .btn-ghost,
.tech-table .btn-outline,
.tech-table .btn-secondary,
.spec-node .btn-outline,
.feature-card .btn-outline,
.prod-card .btn-outline {
  color: var(--color-text-dark);
  border-color: var(--color-border);
}

/* ================================================================
 * 22. RESPONSIVE TYPOGRAPHY & MOBILE SCALING
 *     Mobile-first breakpoints.  375px floor = iPhone SE width.
 * ================================================================ */

/* 22.1  Global minimum body size on mobile */
@media (max-width: 768px) {
  html { font-size: 14px; }      /* 14px floor for body text */
  body { font-size: 14px; line-height: 1.65; }
  h1 { font-size: clamp(28px, 7vw, 32px); }
  h2 { font-size: clamp(20px, 5vw, 24px); }
  h3 { font-size: clamp(17px, 4.5vw, 20px); }
  h4 { font-size: clamp(15px, 4vw, 17px); }

  /* Container breathing room */
  .container { padding-left: var(--container-padding-x-sm); padding-right: var(--container-padding-x-sm); }

  /* Section padding reduced on mobile */
  .section { padding-top: 36px; padding-bottom: 36px; }
  .section-title { font-size: clamp(20px, 5vw, 24px); margin-bottom: 24px; }

  /* Cards: enforce 16px+ padding floor */
  .feature-card,
  .prod-card,
  .dl-card,
  .spec-node,
  .app-card-body,
  .faq-item,
  .compat-card {
    padding: 16px !important;
  }

  /* Multi-col grids → 1 or 2 cols on mobile */
  .features-grid,
  .dl-grid {
    grid-template-columns: repeat(2, 1fr) !important;
    gap: 12px !important;
  }
  .app-grid,
  .products-grid {
    grid-template-columns: repeat(2, 1fr) !important;
    gap: 12px !important;
  }
  .faq-grid {
    grid-template-columns: 1fr !important;
  }
  .compat-wrapper {
    grid-template-columns: 1fr !important;
  }
  /* 7-col specs bar collapses to 2-col grid */
  .specs-bar {
    grid-template-columns: repeat(2, 1fr) !important;
    gap: 16px !important;
  }
  /* install-flow collapses to vertical stack */
  .install-flow {
    flex-direction: column !important;
    align-items: stretch !important;
    gap: 16px !important;
  }
  .install-step:not(:last-child)::after { display: none; }

  /* Hero sections stack */
  .hero-section {
    grid-template-columns: 1fr !important;
    gap: 24px !important;
  }
  .hero-cta { flex-direction: column; align-items: stretch; }
  .hero-cta > * { width: 100%; justify-content: center; }
  .hero-highlights { grid-template-columns: repeat(2, 1fr) !important; gap: 10px !important; }

  /* Tables → horizontal scroll on mobile */
  .tech-table,
  .compat-table {
    display: block;
    overflow-x: auto;
    white-space: nowrap;
    -webkit-overflow-scrolling: touch;
  }

  /* Cert row vertical */
  .cert-row {
    flex-direction: column !important;
    align-items: flex-start !important;
    gap: 16px !important;
  }
}

/* 22.2  Smaller phones (≤ 480px) → 1-col grids */
@media (max-width: 480px) {
  .features-grid,
  .dl-grid,
  .app-grid,
  .products-grid,
  .specs-bar {
    grid-template-columns: 1fr !important;
  }
  .hero-highlights {
    grid-template-columns: 1fr !important;
  }
  .spec-node .val { font-size: 16px; }
  .spec-node .lbl { font-size: 12px; }
}

/* 22.3  Prevent horizontal scrollbar at 375px */
html, body { overflow-x: hidden; }
img, video { max-width: 100%; height: auto; }
* { word-wrap: break-word; overflow-wrap: break-word; }

/* ================================================================
 * 23. BACK-TO-TOP FLOATING BUTTON
 *     Fixed on the right side, appears after scrolling down.
 * ================================================================ */

.back-to-top {
  position: fixed;
  right: 24px;
  bottom: 96px;
  width: 46px;
  height: 46px;
  border: none;
  border-radius: 50%;
  background-color: var(--color-primary);
  color: #ffffff;
  display: flex;
  align-items: center;
  justify-content: center;
  cursor: pointer;
  z-index: 90;
  box-shadow: 0 6px 18px var(--color-primary-glow, rgba(12, 166, 138, 0.25));
  opacity: 0;
  visibility: hidden;
  transform: translateY(12px);
  transition: opacity 0.3s ease, transform 0.3s ease, visibility 0.3s ease, background-color 0.2s ease;
}
.back-to-top.is-visible {
  opacity: 1;
  visibility: visible;
  transform: translateY(0);
}
.back-to-top:hover {
  background-color: var(--color-primary-hover);
}
.back-to-top:active {
  transform: scale(0.94);
}
.back-to-top svg { display: block; }

@media (max-width: 768px) {
  .back-to-top {
    right: 16px;
    bottom: 80px;
    width: 42px;
    height: 42px;
  }
}