/* =========================================================
   产品详情页专属样式
   文件：css/product.css
   依赖：css/style.css、css/aboutus.css（复用 .sub-banner）
   ========================================================= */

/* ========== Section 1：产品主图 + 信息 ========== */
.pd-hero {
    padding: 64px 20px;
    background: var(--bg-white);
}
.pd-hero-inner {
    max-width: var(--container);
    margin: 0 auto;
    display: grid;
    grid-template-columns: 480px 1fr;
    gap: 64px;
    align-items: start;
}

/* 左侧主图 */
.pd-gallery { position: relative; }
.pd-gallery-main {
    width: 100%;
    aspect-ratio: 1 / 1;
    border-radius: 16px;
    background: #e6ebf3 center/cover no-repeat;
    box-shadow: 0 12px 40px rgba(0,0,0,0.1);
    position: relative;
    overflow: hidden;
}
.pd-gallery-main::after {
    content: '';
    position: absolute; inset: 0;
    background: linear-gradient(135deg, rgba(26,95,160,0.05) 0%, rgba(0,0,0,0.05) 100%);
}
.pd-gallery-thumbs {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: 12px;
    margin-top: 16px;
}
.pd-gallery-thumb {
    aspect-ratio: 1 / 1;
    border-radius: 8px;
    background: #e6ebf3 center/cover no-repeat;
    cursor: pointer;
    border: 2px solid transparent;
    transition: border-color 0.2s ease, transform 0.2s ease;
}
.pd-gallery-thumb:hover { transform: translateY(-2px); }
.pd-gallery-thumb.is-active { border-color: #70b52c; }

/* 右侧产品信息 */
.pd-info { min-width: 0; }
.pd-crumbs {
    font-size: 13px;
    color: var(--text-muted);
    margin-bottom: 20px;
    display: flex; align-items: center; gap: 8px;
}
.pd-crumbs a { color: var(--text-muted); transition: color 0.2s ease; }
.pd-crumbs a:hover { color: var(--primary); }
.pd-crumbs .sep { font-size: 10px; color: #d0d5dd; }

.pd-tag {
    display: inline-block;
    font-size: 12px;
    font-weight: 600;
    color: var(--primary);
    background: #e8f1fc;
    padding: 5px 14px;
    border-radius: 4px;
    letter-spacing: 1px;
    margin-bottom: 14px;
}
.pd-title {
    font-size: clamp(26px, 3.4vw, 38px);
    font-weight: 700;
    color: var(--primary-dark);
    line-height: 1.35;
    letter-spacing: -0.3px;
    margin-bottom: 14px;
}
.pd-subtitle {
    font-size: 15px;
    color: #6b7280;
    line-height: 1.8;
    margin-bottom: 28px;
}

.pd-info-label {
    font-size: 13px;
    font-weight: 600;
    color: var(--text-dark);
    letter-spacing: 1px;
    margin-bottom: 12px;
    display: flex; align-items: center; gap: 8px;
}
.pd-info-label::before {
    content: '';
    width: 20px; height: 2px;
    background: #70b52c;
}
.pd-scenes {
    display: flex; flex-wrap: wrap; gap: 10px;
    margin-bottom: 32px;
}
.pd-scene-chip {
    font-size: 13px;
    color: var(--primary);
    background: #e8f1fc;
    padding: 7px 16px;
    border-radius: 20px;
    display: inline-flex; align-items: center; gap: 6px;
}
.pd-scene-chip i { font-size: 10px; color: #70b52c; }

/* 优点 tips */
.pd-advantages {
    border-top: 1px dashed #e5e8ee;
    padding-top: 24px;
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 14px 24px;
}
.pd-advantage {
    display: flex; gap: 12px; align-items: flex-start;
    font-size: 14px;
    color: #374151;
    line-height: 1.6;
}
.pd-advantage i {
    flex-shrink: 0;
    width: 24px; height: 24px;
    background: linear-gradient(135deg, var(--primary) 0%, var(--primary-light) 100%);
    color: #fff;
    border-radius: 50%;
    font-size: 10px;
    display: flex; align-items: center; justify-content: center;
}

/* ========== Section 2：产品详情介绍 ========== */
.pd-detail {
    padding: 80px 20px;
    background: var(--bg-light);
}
.pd-detail-inner {
    max-width: var(--container);
    margin: 0 auto;
}
.pd-section-title {
    font-size: clamp(22px, 2.6vw, 30px);
    font-weight: 700;
    color: var(--primary-dark);
    text-align: center;
    margin-bottom: 48px;
}
.pd-section-title small {
    display: block;
    font-size: 12px;
    font-weight: 600;
    color: #70b52c;
    letter-spacing: 4px;
    margin-bottom: 10px;
}
.pd-detail-content {
    font-size: 15px;
    line-height: 2;
    color: #4b5563;
    max-width: 880px;
    margin: 0 auto;
    text-align: justify;
}
.pd-detail-content p { margin-bottom: 20px; }
.pd-detail-content p:first-of-type { text-indent: 2em; }
.pd-detail-content p:first-letter {
    font-size: 20px;
    font-weight: 700;
    color: var(--primary);
    float: left;
    line-height: 1;
    margin-right: 6px;
    margin-top: 4px;
}

/* ========== Section 3：解决方案 ========== */
.pd-solutions {
    padding: 80px 20px;
    background: var(--bg-white);
}
.pd-solutions-inner {
    max-width: var(--container);
    margin: 0 auto;
}
.pd-sol-list {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: 28px;
}
.pd-sol-item {
    display: grid;
    grid-template-columns: 200px 1fr;
    gap: 24px;
    align-items: center;
    padding: 24px;
    background: #fff;
    border: 1px solid #eef0f5;
    border-radius: 16px;
    transition: transform 0.3s ease, box-shadow 0.3s ease, border-color 0.3s ease;
}
.pd-sol-item:hover {
    transform: translateY(-4px);
    box-shadow: 0 12px 32px rgba(0,0,0,0.08);
    border-color: rgba(26,95,160,0.2);
}
.pd-sol-item-img {
    width: 100%;
    aspect-ratio: 4 / 3;
    border-radius: 10px;
    background: #e6ebf3 center/cover no-repeat;
    overflow: hidden;
}
.pd-sol-item h3 {
    font-size: 17px;
    font-weight: 600;
    color: var(--text-dark);
    margin-bottom: 10px;
    display: flex; align-items: center; gap: 10px;
}
.pd-sol-item h3::before {
    content: '';
    width: 24px; height: 2px;
    background: #70b52c;
}
.pd-sol-item p {
    font-size: 13.5px;
    line-height: 1.9;
    color: var(--text-muted);
    margin-bottom: 12px;
}
.pd-sol-item-tags {
    display: flex; flex-wrap: wrap; gap: 8px;
}
.pd-sol-item-tags span {
    font-size: 11px;
    color: var(--primary);
    background: #e8f1fc;
    padding: 3px 10px;
    border-radius: 3px;
}

/* ========== Section 4：咨询转化 CTA ========== */
.pd-cta {
    position: relative;
    padding: 96px 20px;
    background: url('../img/chanpin_bg.jpg') center/cover no-repeat fixed;
    overflow: hidden;
}
.pd-cta::before {
    content: '';
    position: absolute; inset: 0;
    background: linear-gradient(135deg,
        rgba(15,30,55,0.88) 0%,
        rgba(26,95,160,0.82) 50%,
        rgba(19,71,120,0.88) 100%);
}
.pd-cta-inner {
    position: relative; z-index: 2;
    max-width: 720px;
    margin: 0 auto;
    text-align: center;
    color: #fff;
}
.pd-cta-icon {
    width: 72px; height: 72px;
    background: #70b52c;
    border-radius: 50%;
    margin: 0 auto 28px;
    display: flex; align-items: center; justify-content: center;
    font-size: 28px;
    box-shadow: 0 8px 32px rgba(112,181,44,0.5);
    animation: float 3s ease-in-out infinite;
}
@keyframes float {
    0%, 100% { transform: translateY(0); }
    50% { transform: translateY(-8px); }
}
.pd-cta h2 {
    font-size: clamp(24px, 3vw, 34px);
    font-weight: 700;
    line-height: 1.4;
    margin-bottom: 14px;
    letter-spacing: -0.3px;
}
.pd-cta-desc {
    font-size: 15px;
    color: rgba(255,255,255,0.8);
    line-height: 1.9;
    margin-bottom: 36px;
}
.pd-cta-buttons {
    display: flex; gap: 16px; justify-content: center; flex-wrap: wrap;
}
.pd-cta-btn {
    display: inline-flex; align-items: center; gap: 10px;
    padding: 15px 36px;
    font-size: 15px; font-weight: 600;
    border-radius: 50px;
    cursor: pointer; border: none;
    text-decoration: none;
    transition: all 0.3s ease;
}
.pd-cta-btn--primary {
    background: #70b52c;
    color: #fff;
    box-shadow: 0 6px 24px rgba(112,181,44,0.45);
}
.pd-cta-btn--primary:hover {
    background: #5c9a23;
    transform: translateY(-2px);
    box-shadow: 0 10px 30px rgba(112,181,44,0.55);
}
.pd-cta-btn--ghost {
    background: transparent;
    color: #fff;
    border: 2px solid rgba(255,255,255,0.5);
}
.pd-cta-btn--ghost:hover {
    background: #fff;
    color: var(--primary);
    border-color: #fff;
    transform: translateY(-2px);
}

/* ========== 响应式 ========== */
@media (max-width: 1024px) {
    .pd-hero-inner { grid-template-columns: 1fr; gap: 48px; }
    .pd-gallery-main { max-width: 480px; margin: 0 auto; }
    .pd-sol-list { grid-template-columns: 1fr; }
}
@media (max-width: 768px) {
    .pd-hero { padding: 48px 16px; }
    .pd-gallery-thumbs { grid-template-columns: repeat(4, 1fr); }
    .pd-advantages { grid-template-columns: 1fr; }
    .pd-detail { padding: 56px 16px; }
    .pd-solutions { padding: 56px 16px; }
    .pd-sol-item {
        grid-template-columns: 1fr;
        gap: 16px;
    }
    .pd-sol-item-img { aspect-ratio: 16 / 9; }
    .pd-cta { padding: 64px 20px; }
    .pd-cta-icon { width: 56px; height: 56px; font-size: 22px; }
}