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/* ════════════════════════════════════════
   solution-detail.css  —  IoT 子页面专用样式
   ════════════════════════════════════════ */

/* ── Hero ── */
.sd-hero {
  position: relative;
  height: 100vh;
  min-height: 560px;
  overflow: hidden;
  display: flex;
  align-items: center;
}
.sd-hero__bg {
  position: absolute;
  inset: 0;
  width: 100%;
  height: 100%;
  object-fit: cover;
  object-position: center;
}
.sd-hero__overlay {
  position: absolute;
  inset: 0;
  background: linear-gradient(to right, rgba(219,234,254,.92) 0%, rgba(233,213,255,.55) 50%, rgba(252,231,243,.3) 100%);
  display: flex;
  align-items: center;
}
.sd-hero__content {
  position: relative;
  z-index: 1;
  max-width: 640px;
}
.sd-hero__eyebrow {
  font-size: .875rem;
  font-weight: 500;
  color: var(--color-accent);
  letter-spacing: .05em;
  margin-bottom: 12px;
}
.sd-hero__title {
  font-size: clamp(1.75rem, 4vw, 2.5rem);
  font-weight: 700;
  color: var(--color-text-primary);
  margin-bottom: 8px;
  line-height: 1.2;
}
.sd-hero__subtitle {
  font-size: 1.125rem;
  font-weight: 600;
  color: var(--color-accent);
  margin-bottom: 16px;
}
.sd-hero__desc {
  color: var(--color-text-secondary);
  font-size: 1rem;
  line-height: 1.7;
  margin-bottom: 32px;
}
.sd-hero__actions { display: flex; gap: 12px; flex-wrap: wrap; }

/* ── Section 通用 ── */
.sd-section { padding: 96px 0; }
.sd-section--white { background: #fff; }
.sd-section--subtle { background: var(--color-bg-subtle); }
.sd-section--gradient {
  background: linear-gradient(135deg, #eff6ff 0%, #f5f3ff 50%, #fdf2f8 100%);
}
.sd-section__header { text-align: center; margin-bottom: 56px; }
.sd-section__title {
  font-size: clamp(1.5rem, 3vw, 1.75rem);
  font-weight: 700;
  color: var(--color-text-primary);
  margin-bottom: 12px;
}
.sd-section__desc { color: var(--color-text-secondary); font-size: .9375rem; }

/* ── 行业痛点 ── */
.sd-pain-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 24px;
}
.sd-pain-card {
  background: #fff;
  border-radius: 20px;
  padding: 32px;
  border: 1px solid var(--color-border);
  transition: box-shadow .2s;
}
.sd-pain-card:hover { box-shadow: 0 4px 20px rgba(0,0,0,.07); }
.sd-pain-card__icon {
  width: 48px;
  height: 48px;
  border-radius: 12px;
  background: rgba(37,104,242,.08);
  display: flex;
  align-items: center;
  justify-content: center;
  color: var(--color-accent);
  margin-bottom: 16px;
}
.sd-pain-card__title {
  font-size: 1.125rem;
  font-weight: 700;
  color: var(--color-text-primary);
  margin-bottom: 10px;
}
.sd-pain-card__desc {
  font-size: .875rem;
  color: var(--color-text-secondary);
  line-height: 1.7;
  margin: 0;
}

/* ── 架构图 ── */
.sd-arch {
  background: #fff;
  border-radius: 20px;
  padding: 32px;
  border: 1px solid var(--color-border);
  text-align: center;
}
.sd-arch__img {
  max-width: 100%;
  height: auto;
  border-radius: 12px;
}

/* ── 核心产品：左右布局 ── */
.sd-products {
  display: flex;
  flex-direction: column;
  gap: 24px;
}
/* 左侧导航 */
.sd-products__nav {
  width: 100%;
  background: #fff;
  border-radius: 20px;
  border: 1px solid var(--color-border);
  overflow: hidden;
  display: flex;
  flex-direction: column;
}
.sd-products__nav-list {
  max-height: 400px;
  overflow-y: auto;
  scrollbar-width: thin;
  scrollbar-color: rgba(37,104,242,.2) transparent;
}
.sd-products__nav-item {
  width: 100%;
  display: flex;
  align-items: center;
  gap: 12px;
  padding: 14px 16px;
  border: none;
  background: transparent;
  cursor: pointer;
  text-align: left;
  border-left: 3px solid transparent;
  transition: all .2s;
}
.sd-products__nav-item:hover { background: #f8fafc; }
.sd-products__nav-item.active {
  background: rgba(37,104,242,.04);
  border-left-color: var(--color-accent);
}
.sd-products__nav-icon {
  width: 40px;
  height: 40px;
  border-radius: 10px;
  background: rgba(37,104,242,.06);
  display: flex;
  align-items: center;
  justify-content: center;
  color: var(--color-accent);
  flex-shrink: 0;
}
.sd-products__nav-item.active .sd-products__nav-icon {
  background: rgba(37,104,242,.12);
}
.sd-products__nav-text { flex: 1; min-width: 0; }
.sd-products__nav-name {
  display: block;
  font-size: .875rem;
  font-weight: 500;
  color: var(--color-text-primary);
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
}
.sd-products__nav-tag {
  display: inline-block;
  font-size: .6875rem;
  color: var(--color-text-secondary);
  background: #f3f4f6;
  padding: 1px 6px;
  border-radius: 4px;
  margin-top: 3px;
}
.sd-products__nav-item.active .sd-products__nav-tag {
  background: rgba(37,104,242,.1);
  color: var(--color-accent);
}
.sd-products__nav-dot {
  width: 6px;
  height: 6px;
  border-radius: 50%;
  background: var(--color-accent);
  opacity: 0;
  transition: opacity .2s;
  flex-shrink: 0;
}
.sd-products__nav-item.active .sd-products__nav-dot { opacity: 1; }

.sd-products__nav-stats {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 1px;
  background: var(--color-border);
  border-top: 1px solid var(--color-border);
}
.sd-products__nav-stat {
  background: #fff;
  padding: 16px;
  text-align: center;
}
.sd-products__nav-stat-num {
  display: block;
  font-size: 1.25rem;
  font-weight: 700;
  color: var(--color-accent);
}
.sd-products__nav-stat-label {
  font-size: .75rem;
  color: var(--color-text-secondary);
}

/* 右侧详情面板 */
.sd-products__detail { flex: 1; position: relative; }
.sd-product-panel {
  display: none;
  background: #fff;
  border-radius: 20px;
  border: 1px solid var(--color-border);
  overflow: hidden;
}
.sd-product-panel.active { display: flex; flex-direction: column; }

.sd-product-panel__head {
  padding: 28px 28px 20px;
  background: linear-gradient(135deg, #f0f9ff 0%, #f5f3ff 100%);
  border-bottom: 1px solid var(--color-border);
}
.sd-product-panel__tag {
  display: inline-block;
  font-size: .75rem;
  font-weight: 600;
  padding: 3px 10px;
  border-radius: 9999px;
  background: rgba(37,104,242,.1);
  color: var(--color-accent);
  margin-bottom: 16px;
}
.sd-product-panel__title-row {
  display: flex;
  align-items: flex-start;
  gap: 16px;
}
.sd-product-panel__icon {
  width: 64px;
  height: 64px;
  border-radius: 18px;
  background: linear-gradient(135deg, #3b82f6 0%, #06b6d4 100%);
  display: flex;
  align-items: center;
  justify-content: center;
  flex-shrink: 0;
}
.sd-product-panel__name {
  font-size: 1.5rem;
  font-weight: 700;
  color: var(--color-text-primary);
  margin-bottom: 8px;
  line-height: 1.3;
}
.sd-product-panel__features {
  display: flex;
  flex-wrap: wrap;
  gap: 6px;
}
.sd-product-panel__features span {
  font-size: .75rem;
  padding: 3px 10px;
  background: #f1f5f9;
  color: var(--color-text-secondary);
  border-radius: 6px;
}
.sd-product-panel__img {
  width: 100%;
  max-height: 200px;
  object-fit: contain;
  margin-top: 16px;
  border-radius: 10px;
  background: rgba(255,255,255,.6);
}

.sd-product-panel__body { padding: 24px 28px 28px; flex: 1; }
.sd-product-panel__section-title {
  font-size: .75rem;
  font-weight: 600;
  letter-spacing: .08em;
  color: var(--color-text-secondary);
  text-transform: uppercase;
  margin-bottom: 16px;
}
.sd-product-panel__list {
  list-style: none;
  padding: 0;
  margin: 0 0 24px 0;
  display: flex;
  flex-direction: column;
  gap: 10px;
}
.sd-product-panel__list li {
  display: flex;
  align-items: flex-start;
  gap: 10px;
  font-size: .875rem;
  color: var(--color-text-secondary);
  line-height: 1.6;
}
.sd-product-panel__list li::before {
  content: '';
  width: 20px;
  height: 20px;
  border-radius: 6px;
  background: url("data:image/svg+xml,%3Csvg viewBox='0 0 24 24' fill='none' stroke='%233b82f6' stroke-width='2.5' xmlns='http://www.w3.org/2000/svg'%3E%3Cpolyline points='20 6 9 17 4 12'/%3E%3C/svg%3E") center/14px no-repeat, rgba(16,185,129,.08);
  flex-shrink: 0;
  margin-top: 1px;
}

.sd-product-panel__footer {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding-top: 20px;
  border-top: 1px solid var(--color-border);
}
.sd-product-panel__btn {
  padding: 10px 24px;
  background: var(--color-accent);
  color: #fff;
  border: none;
  border-radius: 12px;
  font-size: .875rem;
  font-weight: 500;
  cursor: pointer;
  transition: background .2s;
}
.sd-product-panel__btn:hover { background: #1d4ed8; }
.sd-product-panel__nav-btns { display: flex; gap: 8px; }
.sd-product-panel__nav-btns button {
  width: 40px;
  height: 40px;
  border-radius: 10px;
  border: 1px solid var(--color-border);
  background: #fff;
  font-size: 1.25rem;
  line-height: 1;
  cursor: pointer;
  color: var(--color-text-secondary);
  transition: all .2s;
  display: flex;
  align-items: center;
  justify-content: center;
}
.sd-product-panel__nav-btns button:hover {
  border-color: var(--color-accent);
  color: var(--color-accent);
}

.sd-product-panel__bar {
  height: 4px;
  background: linear-gradient(to right, #3b82f6, #06b6d4, #3b82f6);
}

/* 圆点指示器 */
.sd-products__dots {
  display: flex;
  justify-content: center;
  gap: 8px;
  margin-top: 20px;
}
.sd-products__dot {
  width: 6px;
  height: 6px;
  border-radius: 9999px;
  background: #e2e8f0;
  border: none;
  cursor: pointer;
  padding: 0;
  transition: all .3s;
}
.sd-products__dot.active {
  width: 28px;
  background: var(--color-accent);
}

/* ── 核心优势 ── */
.sd-adv-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 24px;
}
.sd-adv-card {
  background: rgba(255,255,255,.8);
  backdrop-filter: blur(12px);
  border-radius: 20px;
  padding: 32px;
  border: 1px solid rgba(255,255,255,.6);
  box-shadow: 0 1px 4px rgba(0,0,0,.05);
  transition: all .25s;
}
.sd-adv-card:hover {
  background: #fff;
  box-shadow: 0 6px 24px rgba(37,104,242,.1);
  transform: translateY(-2px);
}
.sd-adv-card__icon {
  width: 56px;
  height: 56px;
  border-radius: 16px;
  background: rgba(37,104,242,.12);
  display: flex;
  align-items: center;
  justify-content: center;
  color: var(--color-accent);
  margin-bottom: 20px;
}
.sd-adv-card__title {
  font-size: 1.125rem;
  font-weight: 700;
  color: var(--color-text-primary);
  margin-bottom: 10px;
}
.sd-adv-card__desc {
  font-size: .875rem;
  color: var(--color-text-secondary);
  line-height: 1.7;
  margin: 0;
}

/* ── 标杆客户轮播 ── */
.sd-cases-wrap { position: relative; }
.sd-cases {
  display: flex;
  gap: 24px;
  overflow-x: auto;
  scroll-snap-type: x mandatory;
  scrollbar-width: none;
  padding-bottom: 4px;
}
.sd-cases::-webkit-scrollbar { display: none; }
.sd-case-card {
  flex: 0 0 320px;
  scroll-snap-align: start;
  background: #fff;
  border-radius: 20px;
  border: 1px solid var(--color-border);
  overflow: hidden;
  box-shadow: 0 1px 4px rgba(0,0,0,.05);
  transition: box-shadow .2s;
}
.sd-case-card:hover { box-shadow: 0 8px 24px rgba(0,0,0,.08); }
.sd-case-card__img {
  width: 100%;
  height: 200px;
  object-fit: cover;
}
.sd-case-card__body { padding: 24px; }
.sd-case-card__client {
  font-size: 1.125rem;
  font-weight: 700;
  color: var(--color-text-primary);
  margin-bottom: 4px;
}
.sd-case-card__location {
  font-size: .8125rem;
  color: var(--color-text-secondary);
  margin-bottom: 12px;
}
.sd-case-card__result {
  font-size: 1rem;
  font-weight: 600;
  color: var(--color-text-primary);
  margin-bottom: 8px;
}
.sd-case-card__detail {
  font-size: .875rem;
  color: var(--color-text-secondary);
  line-height: 1.6;
  margin-bottom: 16px;
}
.sd-case-card__metric {
  background: #f0fdf4;
  border: 1px solid #bbf7d0;
  border-radius: 12px;
  padding: 12px 16px;
  display: flex;
  flex-direction: column;
  gap: 2px;
}
.sd-case-card__metric-num {
  font-size: 1.5rem;
  font-weight: 700;
  color: var(--color-accent);
  line-height: 1;
}
.sd-case-card__metric-label {
  font-size: .75rem;
  color: var(--color-text-secondary);
}
.sd-cases__nav {
  display: flex;
  justify-content: center;
  gap: 12px;
  margin-top: 24px;
}
.sd-cases__btn {
  width: 40px;
  height: 40px;
  border-radius: 50%;
  border: 1px solid var(--color-border);
  background: #fff;
  font-size: 1.25rem;
  cursor: pointer;
  color: var(--color-text-secondary);
  transition: all .2s;
  display: flex;
  align-items: center;
  justify-content: center;
}
.sd-cases__btn:hover {
  border-color: var(--color-accent);
  color: var(--color-accent);
}

/* ── 响应式 ── */
@media (min-width: 1024px) {
  .sd-products {
    flex-direction: row;
    align-items: flex-start;
  }
  .sd-products__nav {
    width: 280px;
    flex-shrink: 0;
  }
  .sd-products__dots {
    display: none;
  }
}
@media (max-width: 767px) {
  .sd-hero { height: 90vh; }
  .sd-pain-grid { grid-template-columns: 1fr; }
  .sd-adv-grid { grid-template-columns: 1fr; }
  .sd-case-card { flex: 0 0 85vw; }
  .sd-product-panel__head { padding: 20px 20px 16px; }
  .sd-product-panel__body { padding: 16px 20px 20px; }
  .sd-product-panel__icon { width: 48px; height: 48px; border-radius: 14px; }
  .sd-product-panel__name { font-size: 1.25rem; }
  .sd-section { padding: 64px 0; }
}
@media (max-width: 1023px) and (min-width: 768px) {
  .sd-adv-grid { grid-template-columns: repeat(3, 1fr); }
  .sd-pain-grid { grid-template-columns: repeat(2, 1fr); }
}