/* ========================================
   水生活科技 - 组件样式
   按钮、卡片、导航、表单、表格等
   ======================================== */

/* --- 按钮 --- */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  padding: 0.75rem 1.5rem;
  font-size: 1rem;
  font-weight: 600;
  line-height: 1.25;
  border-radius: var(--radius-md);
  cursor: pointer;
  transition: all var(--transition-base);
  white-space: nowrap;
  border: 2px solid transparent;
}

.btn:hover {
  transform: translateY(-1px);
  box-shadow: var(--shadow-md);
}

.btn:active {
  transform: translateY(0);
}

.btn--primary {
  background-color: var(--color-cta);
  color: var(--color-white);
}

.btn--primary:hover {
  background-color: var(--color-cta-hover);
}

.btn--secondary {
  background-color: var(--color-secondary);
  color: var(--color-white);
}

.btn--secondary:hover {
  background-color: var(--color-primary);
}

.btn--outline {
  background: transparent;
  border-color: var(--color-white);
  color: var(--color-white);
}

.btn--outline:hover {
  background: var(--color-white);
  color: var(--color-primary);
}

.btn--outline-dark {
  background: transparent;
  border-color: var(--color-secondary);
  color: var(--color-secondary);
}

.btn--outline-dark:hover {
  background: var(--color-secondary);
  color: var(--color-white);
}

.btn--lg {
  padding: 1rem 2rem;
  font-size: 1.1rem;
  border-radius: var(--radius-lg);
}

.btn--sm {
  padding: 0.5rem 1rem;
  font-size: 0.875rem;
}

.btn--block {
  width: 100%;
}

.btn--icon {
  margin-right: var(--space-sm);
}

/* --- 卡片 --- */
.card {
  background: var(--color-white);
  border-radius: var(--radius-lg);
  overflow: hidden;
  box-shadow: var(--shadow-md);
  transition: all var(--transition-base);
}

.card:hover {
  box-shadow: var(--shadow-xl);
  transform: translateY(-4px);
}

.card__image {
  width: 100%;
  aspect-ratio: 16 / 10;
  object-fit: cover;
}

.card__body {
  padding: var(--space-lg);
}

.card__title {
  font-size: 1.25rem;
  font-weight: 700;
  color: var(--color-primary);
  margin-bottom: var(--space-sm);
}

.card__text {
  color: var(--color-gray-600);
  font-size: 0.95rem;
  margin-bottom: var(--space-md);
}

.card__tag {
  display: inline-block;
  padding: 0.25rem 0.75rem;
  background: var(--color-accent-light);
  color: var(--color-secondary);
  border-radius: var(--radius-full);
  font-size: 0.75rem;
  font-weight: 600;
  margin-right: var(--space-xs);
}

.card--feature {
  background: var(--color-off-white);
  border: 1px solid var(--color-gray-200);
  border-radius: var(--radius-lg);
  padding: var(--space-xl);
  text-align: center;
  transition: all var(--transition-base);
}

.card--feature:hover {
  border-color: var(--color-accent);
  box-shadow: var(--shadow-lg);
  transform: translateY(-4px);
}

.card--feature .icon {
  font-size: 2.5rem;
  margin-bottom: var(--space-md);
}

.card--feature h3 {
  margin-bottom: var(--space-sm);
}

.card--feature p {
  color: var(--color-gray-500);
  font-size: 0.9rem;
  margin-bottom: 0;
}

/* --- 系统卡片（用于系统概览页） --- */
.system-card {
  display: block;
  border: 1px solid var(--color-gray-200);
  border-radius: var(--radius-lg);
  overflow: hidden;
  transition: all var(--transition-base);
  background: var(--color-white);
}

.system-card:hover {
  border-color: var(--color-accent);
  box-shadow: var(--shadow-lg);
  transform: translateY(-2px);
}

.system-card__image {
  width: 100%;
  aspect-ratio: 3 / 2;
  object-fit: cover;
  background: var(--color-gray-100);
}

.system-card__body {
  padding: var(--space-lg);
}

.system-card__title {
  font-size: 1.125rem;
  font-weight: 700;
  color: var(--color-primary);
  margin-bottom: var(--space-xs);
}

.system-card__brand {
  font-size: 0.8rem;
  color: var(--color-secondary);
  font-weight: 600;
  margin-bottom: var(--space-sm);
}

.system-card__desc {
  font-size: 0.9rem;
  color: var(--color-gray-600);
  line-height: 1.5;
}

/* --- 导航栏 --- */
.navbar {
  position: sticky;
  top: 0;
  z-index: 1000;
  background: var(--color-white);
  box-shadow: var(--shadow-sm);
  border-bottom: 1px solid var(--color-gray-100);
}

.navbar__inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 64px;
}

.navbar__logo {
  display: flex;
  align-items: center;
  font-size: 1.25rem;
  font-weight: 700;
  color: var(--color-primary);
  text-decoration: none;
}

.navbar__logo-icon {
  width: 32px;
  height: 32px;
  margin-right: var(--space-sm);
  background: linear-gradient(135deg, var(--color-secondary), var(--color-accent));
  border-radius: var(--radius-md);
  display: flex;
  align-items: center;
  justify-content: center;
  color: var(--color-white);
  font-weight: 900;
  font-size: 1rem;
}

.navbar__links {
  display: none;
  align-items: center;
  gap: var(--space-xl);
}

.navbar__link {
  font-size: 0.95rem;
  font-weight: 500;
  color: var(--color-gray-700);
  transition: color var(--transition-fast);
  position: relative;
}

.navbar__link:hover,
.navbar__link--active {
  color: var(--color-secondary);
}

.navbar__link--active::after {
  content: '';
  position: absolute;
  bottom: -4px;
  left: 0;
  right: 0;
  height: 2px;
  background: var(--color-secondary);
  border-radius: var(--radius-full);
}

/* 下拉菜单 */
.navbar__dropdown {
  position: relative;
}

.navbar__dropdown-trigger {
  display: flex;
  align-items: center;
  gap: var(--space-xs);
  cursor: pointer;
}

.navbar__dropdown-trigger::after {
  content: '';
  display: inline-block;
  width: 0;
  height: 0;
  border-left: 4px solid transparent;
  border-right: 4px solid transparent;
  border-top: 4px solid currentColor;
  transition: transform var(--transition-fast);
}

.navbar__dropdown:hover .navbar__dropdown-trigger::after {
  transform: rotate(180deg);
}

.navbar__dropdown-menu {
  display: none;
  position: absolute;
  top: 100%;
  left: 0;
  min-width: 330px;
  padding: var(--space-sm) 0;
  background: var(--color-white);
  border-radius: var(--radius-md);
  box-shadow: var(--shadow-xl);
  border: 1px solid var(--color-gray-200);
  z-index: 100;
}

.navbar__dropdown:hover .navbar__dropdown-menu {
  display: block;
}

.navbar__dropdown-item {
  display: block;
  white-space: nowrap;
  padding: var(--space-sm) var(--space-lg);
  font-size: 0.9rem;
  color: var(--color-gray-700);
  transition: all var(--transition-fast);
}

.navbar__dropdown-item:hover {
  background: var(--color-off-white);
  color: var(--color-secondary);
  padding-left: calc(var(--space-lg) + 4px);
}

.navbar__cta {
  display: none;
}

/* 移动端菜单按钮 */
.navbar__menu-btn {
  display: flex;
  flex-direction: column;
  gap: 5px;
  cursor: pointer;
  padding: var(--space-sm);
  background: none;
  border: none;
}

.navbar__menu-btn span {
  display: block;
  width: 24px;
  height: 2px;
  background: var(--color-primary);
  border-radius: var(--radius-sm);
  transition: all var(--transition-fast);
}

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

.navbar__menu-btn.open span:nth-child(2) {
  opacity: 0;
}

.navbar__menu-btn.open span:nth-child(3) {
  transform: rotate(-45deg) translate(6px, -6px);
}

/* 移动端菜单 */
.mobile-menu {
  display: none;
  position: fixed;
  top: 64px;
  left: 0;
  right: 0;
  bottom: 0;
  background: var(--color-white);
  padding: var(--space-lg);
  overflow-y: auto;
  z-index: 999;
}

.mobile-menu.open {
  display: block;
}

.mobile-menu__link {
  display: block;
  padding: var(--space-md) 0;
  font-size: 1.1rem;
  font-weight: 500;
  color: var(--color-gray-700);
  border-bottom: 1px solid var(--color-gray-100);
}

.mobile-menu__link--active {
  color: var(--color-secondary);
}

.mobile-menu__submenu {
  padding-left: var(--space-lg);
  padding-bottom: var(--space-sm);
}

.mobile-menu__submenu a {
  display: block;
  padding: var(--space-sm) 0;
  font-size: 0.95rem;
  color: var(--color-gray-500);
}

.mobile-menu__cta {
  margin-top: var(--space-xl);
}

/* --- 页脚 --- */
.footer {
  background: var(--color-gray-900);
  color: var(--color-gray-400);
  padding: var(--space-3xl) 0 var(--space-xl);
}

.footer__grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: var(--space-2xl);
}

.footer__col-title {
  color: var(--color-white);
  font-size: 1rem;
  font-weight: 700;
  margin-bottom: var(--space-lg);
}

.footer__link {
  display: block;
  padding: var(--space-xs) 0;
  font-size: 0.9rem;
  color: var(--color-gray-400);
  transition: color var(--transition-fast);
}

.footer__link:hover {
  color: var(--color-accent);
}

.footer__brand {
  display: flex;
  align-items: center;
  gap: var(--space-sm);
  margin-bottom: var(--space-md);
}

.footer__brand-name {
  font-size: 1.25rem;
  font-weight: 700;
  color: var(--color-white);
}

.footer__brand-desc {
  font-size: 0.85rem;
  line-height: 1.7;
  margin-bottom: var(--space-md);
}

.footer__contact-item {
  display: flex;
  align-items: flex-start;
  gap: var(--space-sm);
  padding: var(--space-xs) 0;
  font-size: 0.9rem;
}

.footer__bottom {
  margin-top: var(--space-2xl);
  padding-top: var(--space-xl);
  border-top: 1px solid var(--color-gray-700);
  text-align: center;
  font-size: 0.8rem;
  color: var(--color-gray-500);
}

/* --- 表单 --- */
.form-group {
  margin-bottom: var(--space-lg);
}

.form-label {
  display: block;
  margin-bottom: var(--space-sm);
  font-weight: 600;
  font-size: 0.9rem;
  color: var(--color-gray-700);
}

.form-label--required::after {
  content: ' *';
  color: var(--color-cta);
}

.form-input,
.form-textarea,
.form-select {
  width: 100%;
  padding: 0.75rem 1rem;
  border: 1px solid var(--color-gray-300);
  border-radius: var(--radius-md);
  background: var(--color-white);
  font-size: 1rem;
  transition: all var(--transition-fast);
}

.form-input:focus,
.form-textarea:focus,
.form-select:focus {
  border-color: var(--color-secondary);
  box-shadow: 0 0 0 3px rgba(0, 119, 182, 0.1);
}

.form-textarea {
  min-height: 120px;
  resize: vertical;
}

.form-select {
  appearance: none;
  background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='12' height='12' viewBox='0 0 12 12'%3E%3Cpath fill='%2364748B' d='M6 8L1 3h10z'/%3E%3C/svg%3E");
  background-repeat: no-repeat;
  background-position: right 1rem center;
  padding-right: 2.5rem;
}

/* --- 表格 --- */
.table-wrapper {
  overflow-x: auto;
  -webkit-overflow-scrolling: touch;
  border-radius: var(--radius-lg);
  border: 1px solid var(--color-gray-200);
}

.table {
  width: 100%;
  border-collapse: collapse;
  font-size: 0.9rem;
}

.table th {
  background: var(--color-primary);
  color: var(--color-white);
  padding: 0.875rem 1rem;
  text-align: left;
  font-weight: 600;
  white-space: nowrap;
}

.table td {
  padding: 0.75rem 1rem;
  border-bottom: 1px solid var(--color-gray-200);
  color: var(--color-gray-700);
}

.table tr:last-child td {
  border-bottom: none;
}

.table tr:nth-child(even) {
  background: var(--color-gray-50);
}

.table--compare th {
  text-align: center;
}

.table--compare td {
  text-align: center;
}

.table--compare td:first-child {
  text-align: left;
}

/* --- 面包屑 --- */
.breadcrumb {
  display: flex;
  align-items: center;
  flex-wrap: wrap;
  gap: var(--space-sm);
  padding: var(--space-md) 0;
  font-size: 0.875rem;
  color: var(--color-gray-500);
}

.breadcrumb a {
  color: var(--color-secondary);
}

.breadcrumb a:hover {
  text-decoration: underline;
}

.breadcrumb__separator {
  color: var(--color-gray-300);
}

/* --- 标签页/徽章 --- */
.badge {
  display: inline-block;
  padding: 0.3rem 0.75rem;
  background: var(--color-accent-light);
  color: var(--color-secondary);
  border-radius: var(--radius-full);
  font-size: 0.75rem;
  font-weight: 600;
}

.badge--primary {
  background: var(--color-primary);
  color: var(--color-white);
}

.badge--cta {
  background: var(--color-cta);
  color: var(--color-white);
}

/* --- 画廊 --- */
.gallery {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(200px, 1fr));
  gap: var(--space-md);
}

.gallery__item {
  border-radius: var(--radius-md);
  overflow: hidden;
  cursor: pointer;
  transition: all var(--transition-base);
}

.gallery__item:hover {
  transform: scale(1.02);
  box-shadow: var(--shadow-lg);
}

.gallery__item img {
  width: 100%;
  aspect-ratio: 3 / 4;
  object-fit: contain;
  background: var(--color-gray-100);
}

/* --- Lightbox --- */
.lightbox {
  position: fixed;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  z-index: 9999;
  background: rgba(0, 0, 0, 0.92);
  display: flex;
  align-items: center;
  justify-content: center;
  opacity: 0;
  visibility: hidden;
  transition: opacity var(--transition-base), visibility var(--transition-base);
}

.lightbox.active {
  opacity: 1;
  visibility: visible;
}

.lightbox__overlay {
  position: absolute;
  inset: 0;
  cursor: pointer;
}

.lightbox__close {
  position: absolute;
  top: 20px;
  right: 24px;
  width: 48px;
  height: 48px;
  background: rgba(255, 255, 255, 0.12);
  border: none;
  border-radius: 50%;
  color: #fff;
  font-size: 28px;
  cursor: pointer;
  display: flex;
  align-items: center;
  justify-content: center;
  transition: background var(--transition-base);
  z-index: 10;
  line-height: 1;
}

.lightbox__close:hover {
  background: rgba(255, 255, 255, 0.25);
}

.lightbox__nav {
  position: absolute;
  top: 50%;
  transform: translateY(-50%);
  width: 52px;
  height: 52px;
  background: rgba(255, 255, 255, 0.12);
  border: none;
  border-radius: 50%;
  color: #fff;
  font-size: 26px;
  cursor: pointer;
  display: flex;
  align-items: center;
  justify-content: center;
  transition: background var(--transition-base);
  z-index: 10;
  padding: 0;
}

.lightbox__nav:hover {
  background: rgba(255, 255, 255, 0.25);
}

.lightbox__prev {
  left: 20px;
}

.lightbox__next {
  right: 20px;
}

.lightbox__img {
  position: relative;
  z-index: 5;
  max-width: 90vw;
  max-height: 90vh;
  object-fit: contain;
  border-radius: var(--radius-md);
  box-shadow: 0 8px 40px rgba(0, 0, 0, 0.5);
  user-select: none;
  -webkit-user-drag: none;
}

.lightbox__counter {
  position: absolute;
  bottom: 24px;
  left: 50%;
  transform: translateX(-50%);
  color: rgba(255, 255, 255, 0.7);
  font-size: 0.875rem;
  z-index: 10;
  user-select: none;
}

/* --- QR Code --- */
.qr-code {
  text-align: center;
}

.qr-code__img {
  width: 140px;
  height: 140px;
  object-fit: contain;
  background: #fff;
  border-radius: var(--radius-sm);
  padding: 8px;
  box-shadow: 0 2px 8px rgba(0, 0, 0, 0.1);
}

.qr-code__label {
  margin-top: var(--space-xs);
  font-size: 0.8rem;
  color: var(--color-gray-600);
}

/* --- Hero --- */
.hero {
  position: relative;
  padding: var(--space-4xl) 0;
  background: linear-gradient(135deg, var(--color-primary) 0%, var(--color-primary-light) 60%, var(--color-secondary) 100%);
  color: var(--color-white);
  overflow: hidden;
}

.hero::before {
  content: '';
  position: absolute;
  top: -50%;
  right: -20%;
  width: 600px;
  height: 600px;
  background: radial-gradient(circle, rgba(0, 180, 216, 0.15) 0%, transparent 70%);
  border-radius: 50%;
}

.hero::after {
  content: '';
  position: absolute;
  bottom: -30%;
  left: -10%;
  width: 400px;
  height: 400px;
  background: radial-gradient(circle, rgba(232, 101, 45, 0.1) 0%, transparent 70%);
  border-radius: 50%;
}

.hero__content {
  position: relative;
  z-index: 1;
}

.hero__title {
  font-size: clamp(2rem, 5vw, 3.5rem);
  font-weight: 800;
  color: var(--color-white);
  line-height: 1.2;
  margin-bottom: var(--space-lg);
}

.hero__subtitle {
  font-size: clamp(1rem, 2vw, 1.25rem);
  color: var(--color-gray-300);
  max-width: 600px;
  margin-bottom: var(--space-2xl);
  line-height: 1.6;
}

.hero__actions {
  display: flex;
  flex-wrap: wrap;
  gap: var(--space-md);
}

/* --- 品牌栏 --- */
.brand-bar {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  justify-content: center;
  gap: var(--space-2xl);
  padding: var(--space-xl) 0;
  opacity: 0.6;
}

.brand-bar__item {
  font-size: 1.2rem;
  font-weight: 700;
  color: var(--color-gray-500);
  white-space: nowrap;
}

/* --- CTA区 --- */
.cta-section {
  background: linear-gradient(135deg, var(--color-secondary) 0%, var(--color-accent) 100%);
  color: var(--color-white);
  padding: var(--space-3xl) 0;
  text-align: center;
}

.cta-section h2 {
  color: var(--color-white);
  margin-bottom: var(--space-md);
}

.cta-section p {
  color: rgba(255, 255, 255, 0.85);
  margin-bottom: var(--space-xl);
  max-width: 500px;
  margin-left: auto;
  margin-right: auto;
}

/* --- 信息栏 --- */
.info-box {
  background: var(--color-off-white);
  border-left: 4px solid var(--color-accent);
  border-radius: 0 var(--radius-md) var(--radius-md) 0;
  padding: var(--space-lg);
  margin: var(--space-lg) 0;
}

.info-box--warning {
  border-left-color: var(--color-cta);
}

/* --- 时间线 --- */
.timeline {
  position: relative;
  padding-left: var(--space-xl);
}

.timeline::before {
  content: '';
  position: absolute;
  left: 0;
  top: 0;
  bottom: 0;
  width: 2px;
  background: var(--color-gray-200);
}

.timeline__item {
  position: relative;
  padding-bottom: var(--space-xl);
}

.timeline__item::before {
  content: '';
  position: absolute;
  left: calc(-1 * var(--space-xl) - 4px);
  top: 4px;
  width: 10px;
  height: 10px;
  background: var(--color-accent);
  border-radius: 50%;
  border: 2px solid var(--color-white);
}

.timeline__year {
  font-weight: 700;
  color: var(--color-secondary);
  margin-bottom: var(--space-xs);
}

/* --- 统计数据 --- */
.stats-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: var(--space-lg);
  text-align: center;
}

.stat__number {
  font-size: 2.5rem;
  font-weight: 800;
  color: var(--color-accent);
  line-height: 1;
  margin-bottom: var(--space-xs);
}

.stat__label {
  font-size: 0.875rem;
  color: var(--color-gray-500);
}

/* --- FAQ --- */
.faq-item {
  border: 1px solid var(--color-gray-200);
  border-radius: var(--radius-md);
  margin-bottom: var(--space-md);
  overflow: hidden;
}

.faq-question {
  display: flex;
  justify-content: space-between;
  align-items: center;
  width: 100%;
  padding: var(--space-lg);
  font-weight: 600;
  text-align: left;
  cursor: pointer;
  transition: background var(--transition-fast);
  color: var(--color-primary);
}

.faq-question:hover {
  background: var(--color-off-white);
}

.faq-question__icon {
  flex-shrink: 0;
  width: 24px;
  height: 24px;
  transition: transform var(--transition-base);
}

.faq-item.open .faq-question__icon {
  transform: rotate(45deg);
}

.faq-answer {
  max-height: 0;
  overflow: hidden;
  transition: max-height var(--transition-slow);
}

.faq-answer__inner {
  padding: 0 var(--space-lg) var(--space-lg);
  color: var(--color-gray-600);
  line-height: 1.7;
}

.faq-item.open .faq-answer {
  max-height: 500px;
}

/* --- 内容页样式 --- */
.content-section {
  margin-bottom: var(--space-3xl);
}

.content-section__title {
  font-size: 1.5rem;
  font-weight: 700;
  color: var(--color-primary);
  margin-bottom: var(--space-lg);
  padding-bottom: var(--space-sm);
  border-bottom: 2px solid var(--color-accent-light);
}

.feature-list {
  list-style: none;
}

.feature-list li {
  padding: var(--space-sm) 0;
  padding-left: var(--space-xl);
  position: relative;
  color: var(--color-gray-700);
}

.feature-list li::before {
  content: '';
  position: absolute;
  left: 0;
  top: calc(var(--space-sm) + 6px);
  width: 8px;
  height: 8px;
  background: var(--color-accent);
  border-radius: 50%;
}

.step-list {
  counter-reset: step;
  list-style: none;
}

.step-list li {
  counter-increment: step;
  padding: var(--space-lg) 0 var(--space-lg) calc(var(--space-xl) + 8px);
  position: relative;
  border-left: 2px solid var(--color-gray-200);
  margin-left: var(--space-lg);
}

.step-list li:last-child {
  border-left-color: transparent;
}

.step-list li::before {
  content: counter(step);
  position: absolute;
  left: calc(-1 * 16px);
  top: var(--space-lg);
  width: 32px;
  height: 32px;
  background: var(--color-secondary);
  color: var(--color-white);
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  font-weight: 700;
  font-size: 0.875rem;
}

/* --- 返回顶部 --- */
.back-to-top {
  position: fixed;
  bottom: var(--space-xl);
  right: var(--space-xl);
  width: 48px;
  height: 48px;
  background: var(--color-secondary);
  color: var(--color-white);
  border-radius: 50%;
  display: none;
  align-items: center;
  justify-content: center;
  cursor: pointer;
  box-shadow: var(--shadow-lg);
  transition: all var(--transition-base);
  z-index: 999;
  border: none;
}

.back-to-top:hover {
  background: var(--color-primary);
  transform: translateY(-2px);
}

.back-to-top.visible {
  display: flex;
}