/* =========================================================
   SA PRODUCT PAGE STYLES — FIXED VERSION
   ---------------------------------------------------------
   修复清单：
   1. 统一 box-sizing: border-box（项目无全局 reset，防止
      容器 padding 撑破 max-width 造成横向滚动 / 按钮错位）
   2. 引入 CSS 变量（品牌色集中管理）
   3. 修复 CTA 按钮高度错位（download 无边框 52px vs
      rfq-button 有边框 54px）
   4. 移动端表格去掉 white-space: nowrap（避免撑爆布局）
   5. 补齐 :focus-visible 键盘焦点样式（WCAG 无障碍）
   6. 为 3 个缺失的按钮补 transition
   7. 正文灰 #68798a 加深为 #5b6c7d（对比度 ≥ 4.5:1，AA）
   8. 修复 .sa-product-cta 缺下内边距（与下区块贴死）
   9. 统一全文件代码风格（原后 5 节格式混乱）
   10. 增加 prefers-reduced-motion 动效减弱支持
   ========================================================= */

:root {
    /* 品牌色 */
    --sa-primary: #0f355e;              /* 深海军蓝（主背景 / 按钮） */
    --sa-primary-rgb: 15, 53, 94;       /* 主色 RGB，用于 rgba() 透明度 */
    --sa-accent: #1f5f9c;               /* 亮蓝（强调色） */
    --sa-accent-light: #8eb8d8;         /* 浅蓝（深色背景上的强调） */

    /* 文字色 */
    --sa-heading-dark: #102f4f;         /* 大标题（深） */
    --sa-heading: #173b5d;              /* 小标题 */
    --sa-body-text: #5b6c7d;            /* 正文（AA 对比度） */

    /* 背景 & 边框 */
    --sa-bg-light: #f6f8fa;             /* 浅灰区块背景 */
    --sa-bg-muted: #e9eef3;             /* 图片占位背景 */
    --sa-border: #e4e9ee;               /* 通用边框 */

    --sa-white: #ffffff;
    --sa-white-rgb: 255, 255, 255;

    /* 动效 */
    --sa-transition: 0.25s ease;
}

/* =========================================================
   GLOBAL BOX-SIZING FIX
   项目未使用全局 reset，这里为所有 sa- 布局容器、按钮与
   表格统一启用 border-box，避免 padding / border 被加在
   尺寸之外导致横向滚动与元素错位。
   ========================================================= */

.sa-product-hero-container,
.sa-product-features-container,
.sa-product-why-container,
.sa-product-process-container,
.sa-product-capability-container,
.sa-product-forms-container,
.sa-product-applications-container,
.sa-product-technical-container,
.sa-product-cta-container,
.sa-product-cta-box,
.sa-product-rfq-container,
.sa-product-related-container,
.sa-product-faq-container,
.sa-product-usp-container,
.sa-product-usp-icon,
.sa-product-overview-container,
.sa-product-overview-button,
.sa-product-start-container,
.sa-product-step-number,
.sa-product-testimonials-container,
.sa-product-testimonial-card,
.sa-product-testimonial-avatar,
.sa-product-certifications-container,
.sa-product-cert-card,
.sa-product-cert-card-icon,
.sa-product-why-material,
.sa-product-capability-caption,
.sa-product-hero-button,
.sa-product-why-button,
.sa-product-applications-button,
.sa-product-form-card,
.sa-product-related-card,
.sa-product-download,
.sa-product-rfq-button,
.sa-product-content-wrapper table,
.sa-product-content-wrapper th,
.sa-product-content-wrapper td {
    box-sizing: border-box;
}

/* =========================================================
   01. PRODUCT HERO
   ========================================================= */

.sa-product-hero {
    position: relative;
    width: 100%;
    min-height: 560px;
    display: flex;
    align-items: center;
    overflow: hidden;
    background-color: var(--sa-primary);
    background-size: cover;
    background-position: center center;
    background-repeat: no-repeat;
}

/* ---------------------------------------------------------
   HERO OVERLAY
   --------------------------------------------------------- */

.sa-product-hero-overlay {
    position: absolute;
    inset: 0;
    z-index: 1;
    background:
        linear-gradient(
            90deg,
            rgba(8, 34, 61, 0.90) 0%,
            rgba(var(--sa-primary-rgb), 0.78) 45%,
            rgba(var(--sa-primary-rgb), 0.35) 100%
        );
}

/* ---------------------------------------------------------
   HERO CONTAINER
   --------------------------------------------------------- */

.sa-product-hero-container {
    position: relative;
    z-index: 2;
    width: 100%;
    max-width: 1590px;
    margin: 0 auto;
    padding: 100px 30px;
}

/* ---------------------------------------------------------
   HERO CONTENT
   --------------------------------------------------------- */

.sa-product-hero-content {
    width: 100%;
    max-width: 850px;
    margin: 0 auto;
    text-align: center;
}

/* ---------------------------------------------------------
   CATEGORY
   --------------------------------------------------------- */

.sa-product-hero-category {
    display: inline-block;
    margin-bottom: 18px;
    padding: 7px 16px;
    border: 1px solid rgba(var(--sa-white-rgb), 0.45);
    color: var(--sa-white);
    font-size: 16px;
    font-weight: 600;
    line-height: 1.4;
    letter-spacing: 1.5px;
    text-transform: uppercase;
}

/* ---------------------------------------------------------
   H1
   --------------------------------------------------------- */

.sa-product-hero-title {
    margin: 0 0 20px;
    padding: 0;
    color: var(--sa-white);
    font-size: clamp(38px, 4.5vw, 62px);
    font-weight: 700;
    line-height: 1.15;
    letter-spacing: 0.5px;
    /* 去掉 nowrap：单行超宽时 text-align:center 失效（内容贴左缘向右溢出）。
       允许换行后每行都在内容盒内居中；balance 让多行断行更均匀。 */
    text-wrap: balance;
}

/* ---------------------------------------------------------
   SUBTITLE
   --------------------------------------------------------- */

.sa-product-hero-subtitle {
    max-width: 760px;
    margin: 0 auto 25px;
    padding: 0;
    color: rgba(var(--sa-white-rgb), 0.92);
    font-size: 20px;
    font-weight: 400;
    line-height: 1.65;
}

/* ---------------------------------------------------------
   MATERIAL GRADE
   --------------------------------------------------------- */

/* Material / UNS / Werkstoff 统一成行内 badge，居中对齐。
   原来的 .sa-product-hero-grade + .sa-product-hero-codes 结构已合并为
   .sa-product-hero-meta + .sa-product-hero-meta-badge。 */
.sa-product-hero-meta {
    display: flex;
    flex-wrap: wrap;
    align-items: center;
    justify-content: center;
    gap: 10px;
    margin-bottom: 32px;
}

.sa-product-hero-meta-badge,
.sa-product-hero-code {
    display: inline-flex;
    align-items: center;
    padding: 7px 16px;
    background: rgba(255, 255, 255, 0.12);
    border: 1px solid rgba(255, 255, 255, 0.25);
    border-radius: 40px;
    color: var(--sa-white);
    font-size: 14px;
    font-weight: 600;
    line-height: 1.4;
    letter-spacing: 0.2px;
}

/* 旧结构保留兼容（若页面上仍有旧 markup，不会裸奔） */
.sa-product-hero-grade {
    display: flex;
    align-items: center;
    gap: 8px;
    margin-bottom: 32px;
    color: var(--sa-white);
    font-size: 17px;
    line-height: 1.5;
}

.sa-product-hero-grade-label {
    opacity: 0.75;
}

.sa-product-hero-grade-value {
    font-weight: 700;
}

.sa-product-hero-codes {
    display: flex;
    flex-wrap: wrap;
    gap: 10px;
    margin-bottom: 32px;
}

.sa-product-hero-code {
    display: inline-flex;
    align-items: center;
    padding: 7px 16px;
    background: rgba(255, 255, 255, 0.12);
    border: 1px solid rgba(255, 255, 255, 0.25);
    border-radius: 40px;
    color: var(--sa-white);
    font-size: 14px;
    font-weight: 600;
    line-height: 1.4;
    letter-spacing: 0.2px;
}

/* ---------------------------------------------------------
   BUTTONS
   --------------------------------------------------------- */

.sa-product-hero-actions {
    display: flex;
    flex-wrap: wrap;
    align-items: center;
    justify-content: center;
    gap: 14px;
}

.sa-product-hero-button {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    min-height: 54px;
    padding: 0 30px;
    border: 1px solid var(--sa-white);
    border-radius: 40px;
    background: var(--sa-white);
    color: var(--sa-primary);
    font-size: 16px;
    font-weight: 600;
    line-height: 1;
    text-decoration: none;
    transition:
        background-color var(--sa-transition),
        color var(--sa-transition),
        border-color var(--sa-transition),
        transform var(--sa-transition);
}

.sa-product-hero-button:hover {
    background: var(--sa-primary);
    border-color: var(--sa-primary);
    color: var(--sa-white);
    transform: translateY(-2px);
}

.sa-product-hero-button-outline {
    background: transparent;
    color: var(--sa-white);
}

.sa-product-hero-button-outline:hover {
    background: var(--sa-white);
    border-color: var(--sa-white);
    color: var(--sa-primary);
}

/* ---------------------------------------------------------
   RESPONSIVE
   --------------------------------------------------------- */

@media (max-width: 1024px) {
    .sa-product-hero {
        min-height: 500px;
    }

    .sa-product-hero-container {
        padding: 90px 30px;
    }

    .sa-product-hero-content {
        max-width: 760px;
    }
}

@media (max-width: 767px) {
    .sa-product-hero {
        min-height: 440px;
    }

    .sa-product-hero-overlay {
        background:
            linear-gradient(
                90deg,
                rgba(8, 34, 61, 0.90),
                rgba(var(--sa-primary-rgb), 0.72)
            );
    }

    .sa-product-hero-container {
        padding: 75px 20px;
    }

    .sa-product-hero-category {
        margin-bottom: 14px;
        padding: 6px 12px;
        font-size: 12px;
    }

    .sa-product-hero-title {
        margin-bottom: 16px;
        font-size: 38px;
        line-height: 1.15;
        white-space: normal;
    }

    .sa-product-hero-subtitle {
        margin-bottom: 20px;
        font-size: 16px;
        line-height: 1.55;
    }

    .sa-product-hero-meta {
        gap: 8px;
        margin-bottom: 25px;
    }

    .sa-product-hero-meta-badge,
    .sa-product-hero-code {
        padding: 6px 13px;
        font-size: 13px;
    }

    .sa-product-hero-actions {
        flex-direction: column;
        align-items: stretch;
    }

    .sa-product-hero-button {
        width: 100%;
        min-height: 50px;
        padding: 0 20px;
    }
}

/* =========================================================
   02. PRODUCT MAIN FEATURES
   ========================================================= */

.sa-product-features {
    position: relative;
    width: 100%;
    padding: 90px 0;
    background: var(--sa-white);
    overflow: hidden;
}

/* ---------------------------------------------------------
   CONTAINER
   --------------------------------------------------------- */

.sa-product-features-container {
    width: 100%;
    max-width: 1590px;
    margin: 0 auto;
    padding: 0 30px;
}

/* ---------------------------------------------------------
   SECTION HEADER
   --------------------------------------------------------- */

.sa-product-section-header {
    max-width: 950px;
    margin: 0 auto 60px;
    text-align: center;
}

.sa-product-section-eyebrow {
    margin-bottom: 14px;
    color: var(--sa-accent);
    font-size: 16px;
    font-weight: 700;
    line-height: 1.4;
    letter-spacing: 2px;
    text-transform: uppercase;
}

.sa-product-section-header h2 {
    margin: 0 0 20px;
    color: var(--sa-heading-dark);
    font-size: 50px;
    font-weight: 600;
    line-height: 1.2;
    /* 去掉 nowrap，同 H1：允许换行，多行居中 */
    text-wrap: balance;
}

.sa-product-section-header p {
    max-width: 950px;
    margin: 0 auto;
    color: var(--sa-body-text);
    font-size: 17px;
    line-height: 1.75;
}

/* ---------------------------------------------------------
   MAIN GRID
   --------------------------------------------------------- */

.sa-product-features-grid {
    display: grid;
    grid-template-columns:
        minmax(0, 0.95fr)
        minmax(0, 1.05fr);
    gap: 70px;
    align-items: stretch;
}

/* ---------------------------------------------------------
   LEFT IMAGE
   --------------------------------------------------------- */

.sa-product-features-image {
    position: relative;
    min-height: 570px;
}

.sa-product-feature-image-wrapper {
    position: relative;
    width: 100%;
    height: 100%;
    min-height: 570px;
    overflow: hidden;
}

.sa-product-feature-image-wrapper img {
    display: block;
    width: 100%;
    height: 100%;
    min-height: 570px;
    object-fit: cover;
    transition: transform 0.6s ease;
}

.sa-product-feature-image-wrapper:hover img {
    transform: scale(1.04);
}

/* ---------------------------------------------------------
   IMAGE OVERLAY
   --------------------------------------------------------- */

.sa-product-feature-image-overlay {
    position: absolute;
    inset: 0;
    background:
        linear-gradient(
            180deg,
            rgba(var(--sa-primary-rgb), 0.02) 35%,
            rgba(var(--sa-primary-rgb), 0.72) 100%
        );
    pointer-events: none;
}

/* ---------------------------------------------------------
   IMAGE CAPTION
   --------------------------------------------------------- */

.sa-product-feature-image-caption {
    position: absolute;
    left: 35px;
    bottom: 30px;
    z-index: 2;
}

.sa-product-feature-image-caption span {
    display: inline-block;
    padding: 10px 18px;
    background: rgba(var(--sa-primary-rgb), 0.92);
    color: var(--sa-white);
    font-size: 14px;
    font-weight: 600;
    letter-spacing: 1px;
}

/* ---------------------------------------------------------
   IMAGE PLACEHOLDER
   --------------------------------------------------------- */

.sa-product-feature-image-placeholder {
    display: flex;
    align-items: center;
    justify-content: center;
    width: 100%;
    min-height: 570px;
    background: var(--sa-bg-muted);
    color: #6d7d8d;
    font-size: 20px;
    font-weight: 600;
}

/* ---------------------------------------------------------
   RIGHT FEATURE LIST
   --------------------------------------------------------- */

.sa-product-features-list {
    display: flex;
    flex-direction: column;
    justify-content: center;
}

/* ---------------------------------------------------------
   FEATURE ITEM
   --------------------------------------------------------- */

.sa-product-feature-item {
    position: relative;
    display: grid;
    grid-template-columns: 64px minmax(0, 1fr) 38px;
    gap: 22px;
    align-items: start;
    padding: 30px 0;
    border-bottom: 1px solid var(--sa-border);
    transition:
        transform var(--sa-transition),
        padding-left var(--sa-transition);
}

.sa-product-feature-item:first-child {
    padding-top: 0;
}

.sa-product-feature-item:last-child {
    border-bottom: 0;
}

.sa-product-feature-item:hover {
    transform: translateX(5px);
}

/* ---------------------------------------------------------
   FEATURE ICON
   --------------------------------------------------------- */

.sa-product-feature-icon {
    display: flex;
    align-items: center;
    justify-content: center;
    width: 64px;
    height: 64px;
    background: #eef5fa;
    border: 1px solid #dce8f1;
    border-radius: 12px;
    transition:
        background-color var(--sa-transition),
        border-color var(--sa-transition);
}

.sa-product-feature-icon svg {
    width: 30px;
    height: 30px;
    fill: none;
    stroke: var(--sa-accent);
    stroke-width: 1.6;
    stroke-linecap: round;
    stroke-linejoin: round;
    transition: stroke var(--sa-transition);
}

/* ---------------------------------------------------------
   FEATURE CONTENT
   --------------------------------------------------------- */

.sa-product-feature-content h3 {
    margin: 2px 0 9px;
    color: var(--sa-heading);
    font-size: 21px;
    font-weight: 700;
    line-height: 1.35;
}

.sa-product-feature-content p {
    margin: 0;
    color: var(--sa-body-text);
    font-size: 15px;
    line-height: 1.7;
}

/* ---------------------------------------------------------
   FEATURE NUMBER
   --------------------------------------------------------- */

.sa-product-feature-number {
    padding-top: 5px;
    color: #d7e0e8;
    font-size: 17px;
    font-weight: 700;
    line-height: 1;
    text-align: right;
}

/* ---------------------------------------------------------
   HOVER
   --------------------------------------------------------- */

.sa-product-feature-item:hover .sa-product-feature-icon {
    background: var(--sa-accent);
    border-color: var(--sa-accent);
}

.sa-product-feature-item:hover .sa-product-feature-icon svg {
    stroke: var(--sa-white);
}

/* ---------------------------------------------------------
   TABLET
   --------------------------------------------------------- */

@media (max-width: 1024px) {
    .sa-product-features {
        padding: 90px 0;
    }

    .sa-product-features-grid {
        grid-template-columns:
            minmax(0, 1fr)
            minmax(0, 1fr);
        gap: 45px;
    }

    .sa-product-features-image,
    .sa-product-feature-image-wrapper,
    .sa-product-feature-image-wrapper img {
        min-height: 500px;
    }

    .sa-product-section-header h2 {
        font-size: 36px;
        white-space: normal;
    }

    .sa-product-feature-item {
        grid-template-columns:
            55px
            minmax(0, 1fr)
            30px;
        gap: 16px;
    }

    .sa-product-feature-icon {
        width: 55px;
        height: 55px;
    }
}

/* ---------------------------------------------------------
   MOBILE
   --------------------------------------------------------- */

@media (max-width: 767px) {
    .sa-product-features {
        padding: 70px 0;
    }

    .sa-product-features-container {
        padding: 0 20px;
    }

    .sa-product-section-header {
        margin-bottom: 40px;
    }

    .sa-product-section-header h2 {
        font-size: 30px;
        white-space: normal;
    }

    .sa-product-section-header p {
        font-size: 15px;
    }

    .sa-product-features-grid {
        grid-template-columns: 1fr;
        gap: 40px;
    }

    .sa-product-features-image,
    .sa-product-feature-image-wrapper,
    .sa-product-feature-image-wrapper img {
        min-height: 380px;
    }

    .sa-product-feature-item {
        grid-template-columns:
            52px
            minmax(0, 1fr);
        gap: 15px;
        padding: 24px 0;
    }

    .sa-product-feature-item:first-child {
        padding-top: 0;
    }

    .sa-product-feature-number {
        display: none;
    }

    .sa-product-feature-icon {
        width: 52px;
        height: 52px;
    }

    .sa-product-feature-icon svg {
        width: 25px;
        height: 25px;
    }

    .sa-product-feature-content h3 {
        font-size: 19px;
    }

    .sa-product-feature-content p {
        font-size: 14px;
    }

    .sa-product-feature-image-caption {
        left: 20px;
        bottom: 20px;
    }
}

/* =========================================================
   03. WHY CHOOSE THIS ALLOY
   ========================================================= */

.sa-product-why {
    position: relative;
    width: 100%;
    padding: 115px 0;
    background: var(--sa-primary);
    overflow: hidden;
}

/* ---------------------------------------------------------
   BACKGROUND DETAIL
   --------------------------------------------------------- */

.sa-product-why::before {
    content: "";
    position: absolute;
    top: -180px;
    right: -180px;
    width: 520px;
    height: 520px;
    border: 1px solid rgba(var(--sa-white-rgb), 0.08);
    border-radius: 50%;
}

.sa-product-why::after {
    content: "";
    position: absolute;
    bottom: -220px;
    left: -220px;
    width: 560px;
    height: 560px;
    border: 1px solid rgba(var(--sa-white-rgb), 0.06);
    border-radius: 50%;
}

/* ---------------------------------------------------------
   CONTAINER
   --------------------------------------------------------- */

.sa-product-why-container {
    position: relative;
    z-index: 2;
    display: grid;
    grid-template-columns:
        minmax(300px, 0.82fr)
        minmax(0, 1.18fr);
    gap: 90px;
    width: 100%;
    max-width: 1590px;
    margin: 0 auto;
    padding: 0 30px;
}

/* ---------------------------------------------------------
   LEFT INTRO
   --------------------------------------------------------- */

.sa-product-why-intro {
    align-self: center;
}

.sa-product-why-eyebrow {
    margin-bottom: 18px;
    color: var(--sa-accent-light);
    font-size: 13px;
    font-weight: 700;
    line-height: 1.4;
    letter-spacing: 2px;
    text-transform: uppercase;
}

.sa-product-why-intro h2 {
    margin: 0;
    color: var(--sa-white);
    font-size: 46px;
    font-weight: 700;
    line-height: 1.18;
}

.sa-product-why-intro h2 span {
    display: inline;
    color: var(--sa-accent-light);
}

.sa-product-why-description {
    max-width: 480px;
    margin: 0 0 30px;
    color: rgba(var(--sa-white-rgb), 0.78);
    font-size: 16px;
    line-height: 1.8;
}

/* 分隔线（H2 与 description 之间） */
.sa-product-why-line {
    width: 56px;
    height: 3px;
    margin: 22px 0 26px;
    background: var(--sa-accent-light);
}

/* 材质标签块（MATERIAL GRADE） */
.sa-product-why-material {
    display: inline-flex;
    align-items: center;
    gap: 12px;
    margin-bottom: 30px;
    padding: 10px 18px;
    border: 1px solid rgba(var(--sa-white-rgb), 0.25);
    background: rgba(var(--sa-white-rgb), 0.06);
}

.sa-product-why-material-label {
    color: var(--sa-accent-light);
    font-size: 11px;
    font-weight: 700;
    letter-spacing: 1.5px;
}

.sa-product-why-material strong {
    color: var(--sa-white);
    font-size: 16px;
    font-weight: 700;
    line-height: 1.3;
}

/* ---------------------------------------------------------
   CTA
   --------------------------------------------------------- */

.sa-product-why-button {
    display: inline-flex;
    align-items: center;
    gap: 12px;
    min-height: 50px;
    padding: 0 25px;
    border: 1px solid rgba(var(--sa-white-rgb), 0.65);
    color: var(--sa-white);
    font-size: 14px;
    font-weight: 600;
    text-decoration: none;
    transition:
        background-color var(--sa-transition),
        color var(--sa-transition),
        border-color var(--sa-transition),
        transform var(--sa-transition);
}

.sa-product-why-button span {
    font-size: 20px;
    line-height: 1;
    transition: transform var(--sa-transition);
}

.sa-product-why-button:hover {
    background: var(--sa-white);
    border-color: var(--sa-white);
    color: var(--sa-primary);
    transform: translateY(-2px);
}

.sa-product-why-button:hover span {
    transform: translateX(4px);
}

/* ---------------------------------------------------------
   RIGHT GRID
   --------------------------------------------------------- */

.sa-product-why-grid {
    display: grid;
    grid-template-columns: repeat(2, minmax(0, 1fr));
    gap: 0 25px;
}

/* ---------------------------------------------------------
   CARD
   --------------------------------------------------------- */

.sa-product-why-card {
    position: relative;
    padding: 30px 5px 35px;
    border-bottom: 1px solid rgba(var(--sa-white-rgb), 0.16);
}

.sa-product-why-card:nth-child(1),
.sa-product-why-card:nth-child(2) {
    padding-top: 0;
}

/* ---------------------------------------------------------
   CARD TOP
   --------------------------------------------------------- */

.sa-product-why-card-top {
    display: flex;
    align-items: center;
    justify-content: space-between;
    margin-bottom: 30px;
}

.sa-product-why-number {
    color: rgba(var(--sa-white-rgb), 0.25);
    font-size: 14px;
    font-weight: 700;
    letter-spacing: 1px;
}

.sa-product-why-icon {
    display: flex;
    align-items: center;
    justify-content: center;
    width: 52px;
    height: 52px;
    border: 1px solid rgba(var(--sa-white-rgb), 0.22);
    background: rgba(var(--sa-white-rgb), 0.04);
    transition:
        background-color var(--sa-transition),
        border-color var(--sa-transition);
}

.sa-product-why-icon svg {
    width: 25px;
    height: 25px;
    fill: none;
    stroke: var(--sa-white);
    stroke-width: 1.5;
    stroke-linecap: round;
    stroke-linejoin: round;
}

/* ---------------------------------------------------------
   CARD CONTENT
   --------------------------------------------------------- */

.sa-product-why-card h3 {
    margin: 0 0 13px;
    color: var(--sa-white);
    font-size: 20px;
    font-weight: 600;
    line-height: 1.4;
}

.sa-product-why-card p {
    margin: 0;
    color: rgba(var(--sa-white-rgb), 0.78);
    font-size: 14px;
    line-height: 1.75;
}

.sa-product-why-card-line {
    width: 38px;
    height: 2px;
    margin-top: 24px;
    background: rgba(var(--sa-white-rgb), 0.35);
    transition: width var(--sa-transition);
}

.sa-product-why-card:hover .sa-product-why-card-line {
    width: 60px;
    background: var(--sa-accent-light);
}

.sa-product-why-card:hover .sa-product-why-icon {
    background: rgba(var(--sa-white-rgb), 0.12);
    border-color: rgba(var(--sa-white-rgb), 0.45);
}

/* ---------------------------------------------------------
   TABLET
   --------------------------------------------------------- */

@media (max-width: 1024px) {
    .sa-product-why {
        padding: 90px 0;
    }

    .sa-product-why-container {
        grid-template-columns:
            minmax(260px, 0.75fr)
            minmax(0, 1.25fr);
        gap: 50px;
    }

    .sa-product-why-intro h2 {
        font-size: 38px;
    }

    .sa-product-why-card h3 {
        font-size: 18px;
    }
}

/* ---------------------------------------------------------
   MOBILE
   --------------------------------------------------------- */

@media (max-width: 767px) {
    .sa-product-why {
        padding: 75px 0;
    }

    .sa-product-why-container {
        grid-template-columns: 1fr;
        gap: 55px;
        padding: 0 20px;
    }

    .sa-product-why-intro h2 {
        font-size: 32px;
    }

    .sa-product-why-description {
        font-size: 15px;
    }

    .sa-product-why-grid {
        grid-template-columns: 1fr;
    }

    .sa-product-why-card,
    .sa-product-why-card:nth-child(1),
    .sa-product-why-card:nth-child(2) {
        padding: 25px 0 30px;
    }

    .sa-product-why-card:first-child {
        padding-top: 0;
    }

    .sa-product-why-card-top {
        margin-bottom: 22px;
    }

    .sa-product-why-card h3 {
        font-size: 19px;
    }
}

/* =========================================================
   04. MANUFACTURING PROCESS
   ========================================================= */

.sa-product-process {
    padding: 110px 0;
    background: var(--sa-bg-light);
}

.sa-product-process-container {
    max-width: 1590px;
    margin: auto;
    padding: 0 30px;
}

.sa-product-process-header {
    max-width: 800px;
    margin: 0 auto 65px;
    text-align: center;
}

.sa-product-process-eyebrow {
    color: var(--sa-accent);
    font-size: 13px;
    font-weight: 700;
    letter-spacing: 2px;
    margin-bottom: 15px;
}

.sa-product-process-header h2 {
    margin: 0 0 20px;
    color: var(--sa-heading-dark);
    font-size: 42px;
    line-height: 1.25;
}

.sa-product-process-header p {
    margin: auto;
    color: var(--sa-body-text);
    font-size: 17px;
    line-height: 1.8;
}

/* GRID */

.sa-product-process-grid {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: 25px;
}

.sa-product-process-item {
    position: relative;
    background: var(--sa-white);
    padding: 35px 28px;
    min-height: 260px;
    border-top: 3px solid transparent;
    transition:
        transform 0.3s ease,
        border-color 0.3s ease;
}

.sa-product-process-item:hover {
    transform: translateY(-8px);
    border-color: var(--sa-accent);
}

.sa-product-process-number {
    font-size: 42px;
    font-weight: 700;
    color: #dbe5ed;
    line-height: 1;
    margin-bottom: 35px;
}

.sa-product-process-content h3 {
    margin: 0 0 15px;
    color: var(--sa-heading);
    font-size: 21px;
}

.sa-product-process-content p {
    margin: 0;
    color: var(--sa-body-text);
    font-size: 15px;
    line-height: 1.75;
}

/* TABLET */

@media (max-width: 1024px) {
    .sa-product-process-grid {
        grid-template-columns: repeat(2, 1fr);
    }
}

/* MOBILE */

@media (max-width: 767px) {
    .sa-product-process {
        padding: 75px 0;
    }

    .sa-product-process-container {
        padding: 0 20px;
    }

    .sa-product-process-header h2 {
        font-size: 32px;
    }

    .sa-product-process-grid {
        grid-template-columns: 1fr;
    }
}

/* =========================================================
   05. FACTORY CAPABILITY
   ========================================================= */

.sa-product-capability {
    padding: 110px 0;
    background: var(--sa-white);
}

.sa-product-capability-container {
    max-width: 1590px;
    margin: auto;
    padding: 0 30px;
}

.sa-product-capability-eyebrow {
    color: var(--sa-accent);
    font-size: 13px;
    font-weight: 700;
    letter-spacing: 2px;
    margin-bottom: 15px;
}

/* MAIN */

.sa-product-capability-main {
    display: grid;
    grid-template-columns: 0.95fr 1.05fr;
    gap: 70px;
    align-items: center;
}

/* IMAGE */

.sa-product-capability-image {
    position: relative;
    height: 560px;
    overflow: hidden;
}

.sa-product-capability-caption {
    position: absolute;
    left: 0;
    bottom: 0;
    z-index: 2;
    padding: 12px 22px;
    background: rgba(15, 53, 94, 0.85);
    color: var(--sa-white);
    font-size: 14px;
    font-weight: 600;
    letter-spacing: 1px;
}

.sa-product-capability-image img {
    width: 100%;
    height: 100%;
    object-fit: cover;
}

.sa-product-capability-placeholder {
    height: 100%;
    display: flex;
    align-items: center;
    justify-content: center;
    background: var(--sa-bg-muted);
    color: var(--sa-body-text);
    font-size: 22px;
    font-weight: 600;
}

/* CONTENT */

.sa-product-capability-content h2 {
    margin: 15px 0 20px;
    font-size: 42px;
    line-height: 1.25;
    color: var(--sa-heading-dark);
}

.sa-product-capability-content > p {
    color: var(--sa-body-text);
    font-size: 16px;
    line-height: 1.8;
    margin-bottom: 40px;
}

/* STATS */

.sa-product-stats {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: 25px;
}

.sa-product-stat {
    padding: 25px;
    background: var(--sa-bg-light);
    border-left: 3px solid var(--sa-accent);
}

.sa-product-stat strong {
    display: block;
    font-size: 38px;
    line-height: 1;
    color: var(--sa-heading);
    margin-bottom: 12px;
}

.sa-product-stat h3 {
    margin: 0 0 8px;
    font-size: 18px;
    color: var(--sa-heading);
}

.sa-product-stat p {
    margin: 0;
    font-size: 14px;
    line-height: 1.6;
    color: var(--sa-body-text);
}

/* QUALITY */

.sa-product-quality {
    margin-top: 110px;
}

.sa-product-quality-header {
    text-align: center;
    margin-bottom: 55px;
}

.sa-product-quality-eyebrow {
    color: var(--sa-accent);
    font-size: 13px;
    font-weight: 700;
    letter-spacing: 2px;
    text-transform: uppercase;
    margin-bottom: 15px;
}

.sa-product-quality-header h2 {
    font-size: 42px;
    color: var(--sa-heading-dark);
    margin-top: 15px;
}

.sa-product-quality-grid {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: 25px;
}

.sa-product-quality-item {
    padding: 35px 25px;
    background: var(--sa-primary);
    color: var(--sa-white);
}

.sa-product-quality-item span {
    font-size: 15px;
    font-weight: 700;
    color: var(--sa-accent-light);
}

.sa-product-quality-item h3 {
    margin: 25px 0 15px;
    font-size: 20px;
}

.sa-product-quality-item p {
    margin: 0;
    color: rgba(var(--sa-white-rgb), 0.78);
    font-size: 14px;
    line-height: 1.7;
}

/* TABLET */

@media (max-width: 1024px) {
    .sa-product-capability-main {
        grid-template-columns: 1fr;
    }

    .sa-product-quality-grid {
        grid-template-columns: repeat(2, 1fr);
    }
}

/* MOBILE */

@media (max-width: 767px) {
    .sa-product-capability {
        padding: 75px 0;
    }

    .sa-product-capability-container {
        padding: 0 20px;
    }

    .sa-product-capability-image {
        height: 350px;
    }

    .sa-product-capability-content h2,
    .sa-product-quality-header h2 {
        font-size: 32px;
    }

    .sa-product-stats {
        grid-template-columns: 1fr;
    }

    .sa-product-quality-grid {
        grid-template-columns: 1fr;
    }
}

/* =========================================================
   06. PRODUCT FORMS
   ========================================================= */

.sa-product-forms {
    padding: 110px 0;
    background: var(--sa-white);
}

.sa-product-forms-container {
    max-width: 1590px;
    margin: auto;
    padding: 0 30px;
}

/* FORM GRID */

.sa-product-forms-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 25px;
}

/* CARD */

.sa-product-form-card {
    position: relative;
    padding: 35px 30px 30px;
    background: var(--sa-bg-light);
    border: 1px solid #e2e8ed;
    transition:
        transform 0.3s ease,
        box-shadow 0.3s ease,
        border-color 0.3s ease;
}

.sa-product-form-card:hover {
    transform: translateY(-7px);
    border-color: var(--sa-accent);
    box-shadow: 0 15px 40px rgba(var(--sa-primary-rgb), 0.10);
}

/* NUMBER */

.sa-product-form-number {
    position: absolute;
    top: 20px;
    right: 25px;
    color: #d4dee7;
    font-size: 14px;
    font-weight: 700;
}

/* ICON */

.sa-product-form-icon {
    display: flex;
    align-items: center;
    justify-content: center;
    width: 55px;
    height: 55px;
    margin-bottom: 25px;
    background: var(--sa-white);
    border: 1px solid #dbe5ec;
}

.sa-product-form-icon svg {
    width: 27px;
    height: 27px;
    fill: none;
    stroke: var(--sa-accent);
    stroke-width: 1.5;
    stroke-linecap: round;
    stroke-linejoin: round;
}

/* CONTENT */

.sa-product-form-card h3 {
    margin: 0 0 13px;
    color: var(--sa-heading);
    font-size: 20px;
}

.sa-product-form-card p {
    margin: 0 0 25px;
    color: var(--sa-body-text);
    font-size: 14px;
    line-height: 1.7;
}

/* LINK */

.sa-product-form-link {
    display: inline-flex;
    align-items: center;
    gap: 9px;
    color: var(--sa-accent);
    font-size: 13px;
    font-weight: 700;
    text-decoration: none;
}

.sa-product-form-link span {
    font-size: 18px;
    transition: transform var(--sa-transition);
}

.sa-product-form-link:hover span {
    transform: translateX(4px);
}

/* =========================================================
   APPLICATIONS
   ========================================================= */

.sa-product-applications {
    padding: 110px 0;
    background: var(--sa-bg-light);
}

.sa-product-applications-container {
    max-width: 1590px;
    margin: auto;
    padding: 0 30px;
    display: grid;
    grid-template-columns: 0.8fr 1.2fr;
    gap: 90px;
    align-items: center;
}

/* INTRO */

.sa-product-applications-intro h2 {
    margin: 15px 0 20px;
    color: var(--sa-heading-dark);
    font-size: 42px;
    line-height: 1.25;
}

.sa-product-applications-intro > p {
    max-width: 470px;
    margin: 0 0 30px;
    color: var(--sa-body-text);
    font-size: 16px;
    line-height: 1.8;
}

/* BUTTON */

.sa-product-applications-button {
    display: inline-flex;
    align-items: center;
    gap: 12px;
    padding: 0 24px;
    min-height: 50px;
    background: var(--sa-primary);
    color: var(--sa-white);
    font-size: 14px;
    font-weight: 600;
    text-decoration: none;
    transition:
        background-color var(--sa-transition),
        color var(--sa-transition);
}

.sa-product-applications-button span {
    font-size: 20px;
    transition: transform var(--sa-transition);
}

.sa-product-applications-button:hover {
    background: var(--sa-accent);
    color: var(--sa-white);
}

.sa-product-applications-button:hover span {
    transform: translateX(4px);
}

/* APPLICATION GRID */

.sa-product-applications-grid {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: 0 35px;
}

.sa-product-application-item {
    display: grid;
    grid-template-columns: 40px 1fr;
    gap: 18px;
    padding: 28px 0;
    border-bottom: 1px solid #dbe2e8;
}

.sa-product-application-number {
    font-size: 13px;
    font-weight: 700;
    color: var(--sa-accent);
}

.sa-product-application-item h3 {
    margin: 0 0 8px;
    color: var(--sa-heading);
    font-size: 19px;
}

.sa-product-application-item p {
    margin: 0;
    color: var(--sa-body-text);
    font-size: 14px;
    line-height: 1.65;
}

/* TABLET */

@media (max-width: 1024px) {
    .sa-product-forms-grid {
        grid-template-columns: repeat(2, 1fr);
    }

    .sa-product-applications-container {
        grid-template-columns: 1fr 1fr;
        gap: 50px;
    }

    .sa-product-applications-intro h2 {
        font-size: 36px;
    }
}

/* MOBILE */

@media (max-width: 767px) {
    .sa-product-forms {
        padding: 75px 0;
    }

    .sa-product-forms-container {
        padding: 0 20px;
    }

    .sa-product-forms-grid {
        grid-template-columns: 1fr;
    }

    .sa-product-applications {
        padding: 75px 0;
    }

    .sa-product-applications-container {
        grid-template-columns: 1fr;
        gap: 45px;
        padding: 0 20px;
    }

    .sa-product-applications-intro h2 {
        font-size: 32px;
    }

    .sa-product-applications-grid {
        grid-template-columns: 1fr;
    }
}

/* =========================================================
   07. TECHNICAL SPECIFICATIONS
   ========================================================= */

.sa-product-technical {
    padding: 110px 0;
    background: var(--sa-white);
}

.sa-product-technical-container {
    max-width: 1100px;
    margin: auto;
    padding: 0 30px;
}

/* HEADER */

.sa-product-technical-header {
    text-align: center;
    max-width: 800px;
    margin: 0 auto 60px;
}

.sa-product-technical-header h2 {
    margin: 15px 0 20px;
    font-size: 42px;
    line-height: 1.25;
    color: var(--sa-heading-dark);
}

.sa-product-technical-header p {
    margin: auto;
    font-size: 16px;
    line-height: 1.8;
    color: var(--sa-body-text);
}

/* =========================================================
   MARKDOWN CONTENT AREA
   ========================================================= */

.sa-product-content-wrapper {
    font-size: 16px;
    line-height: 1.8;
    color: #46576a;
}

/* H2 */

.sa-product-content-wrapper h2 {
    margin: 70px 0 30px;
    padding-bottom: 15px;
    font-size: 34px;
    line-height: 1.3;
    color: var(--sa-heading-dark);
    border-bottom: 2px solid #e4ebf1;
}

/* first heading */

.sa-product-content-wrapper h2:first-child {
    margin-top: 0;
}

/* H3 */

.sa-product-content-wrapper h3 {
    margin: 40px 0 18px;
    font-size: 24px;
    color: var(--sa-heading);
}

/* PARAGRAPH */

.sa-product-content-wrapper p {
    margin: 0 0 20px;
}

/* LIST */

.sa-product-content-wrapper ul,
.sa-product-content-wrapper ol {
    margin: 0 0 25px 25px;
}

.sa-product-content-wrapper li {
    margin-bottom: 8px;
}

/* TABLE */

.sa-product-content-wrapper table {
    width: 100%;
    border-collapse: collapse;
    margin: 35px 0 45px;
    font-size: 15px;
}

.sa-product-content-wrapper th {
    background: var(--sa-primary);
    color: var(--sa-white);
    font-weight: 600;
    padding: 14px 16px;
    text-align: left;
}

.sa-product-content-wrapper td {
    padding: 13px 16px;
    border: 1px solid #dfe6ec;
    color: #46576a;
}

.sa-product-content-wrapper tr:nth-child(even) {
    background: #f7f9fb;
}

/* TECHNICAL TABLE SCROLL
   三个表格（Composition / Mechanical / Standards）统一预设横向滚动容器：
   `white-space: nowrap` 保证列不折行，容器 overflow-x: auto 在列多内容超宽时
   自动出现横向滚动条（桌面/平板/手机通用），不同产品列数不同也能自适应 */

.sa-product-content-wrapper .sa-product-table-scroll {
    overflow-x: auto;
    -webkit-overflow-scrolling: touch;
    margin: 35px 0 45px;
}

.sa-product-content-wrapper .sa-product-table-scroll table {
    margin: 0;
}

.sa-product-content-wrapper .sa-product-table-composition th,
.sa-product-content-wrapper .sa-product-table-composition td {
    text-align: center;
    white-space: nowrap;
}

.sa-product-content-wrapper .sa-product-table-composition th {
    border: 1px solid #dfe6ec;
}

.sa-product-content-wrapper .sa-product-table-composition tr:nth-child(even) {
    background: transparent;
}

/* SIDE-BY-SIDE TABLE GRID
   Mechanical Properties / Applicable Standards 左右并排 */

.sa-product-content-wrapper .sa-product-table-grid {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 40px;
    margin: 35px 0 45px;
    align-items: start;
}

.sa-product-content-wrapper .sa-product-table-col {
    min-width: 0;
}

.sa-product-content-wrapper .sa-product-table-grid h2 {
    margin: 0 0 24px;
}

.sa-product-content-wrapper .sa-product-table-grid table {
    margin: 0;
}

/* grid 内的滚动容器间距由 grid 统一控制，取消自身的 margin */
.sa-product-content-wrapper .sa-product-table-grid .sa-product-table-scroll {
    margin: 0;
}

/* IMAGE */

.sa-product-content-wrapper img {
    max-width: 100%;
    height: auto;
    margin: 30px auto;
    display: block;
}

/* BLOCKQUOTE */

.sa-product-content-wrapper blockquote {
    margin: 35px 0;
    padding: 25px 30px;
    background: #f5f8fb;
    border-left: 4px solid var(--sa-accent);
    color: #46576a;
}

/* CODE */

.sa-product-content-wrapper code {
    background: #f1f3f5;
    padding: 3px 6px;
    font-size: 90%;
}

/* MOBILE */

@media (max-width: 767px) {
    .sa-product-technical {
        padding: 75px 0;
    }

    .sa-product-technical-container {
        padding: 0 20px;
    }

    .sa-product-technical-header h2 {
        font-size: 32px;
    }

    .sa-product-content-wrapper h2 {
        font-size: 28px;
        margin-top: 50px;
    }

    .sa-product-content-wrapper h3 {
        font-size: 21px;
    }

    /* 响应式表格：允许横向滚动，但单元格内文本正常换行
       （移除 white-space: nowrap，避免长文本撑爆布局） */
    .sa-product-content-wrapper table {
        display: block;
        overflow-x: auto;
    }

    /* 三个表格外层均有滚动容器，表格本体恢复 table 布局，
       避免 display:block 造成双重滚动（滚动交给外层容器） */
    .sa-product-content-wrapper .sa-product-table-scroll table {
        display: table;
        overflow: visible;
    }

    /* 并排表格窄屏回落为单列 */
    .sa-product-content-wrapper .sa-product-table-grid {
        grid-template-columns: 1fr;
        gap: 0;
    }

    .sa-product-content-wrapper .sa-product-table-col + .sa-product-table-col {
        margin-top: 45px;
    }
}

/* =========================================================
   08. CTA DOWNLOAD
   ========================================================= */

.sa-product-cta {
    padding: 90px 0 100px;   /* 修复：补上下内边距，避免与下区块贴死 */
    background: var(--sa-white);
}

.sa-product-cta-container {
    max-width: 1590px;
    margin: auto;
    padding: 0 30px;
}

.sa-product-cta-box {
    display: flex;
    justify-content: space-between;
    align-items: center;
    gap: 50px;
    padding: 55px 60px;
    background: var(--sa-primary);
}

.sa-product-cta-content h2 {
    margin: 15px 0;
    color: var(--sa-white);
    font-size: 36px;
}

.sa-product-cta-content p {
    margin: 0;
    max-width: 500px;
    color: rgba(var(--sa-white-rgb), 0.75);
    font-size: 16px;
    line-height: 1.7;
}

/* BUTTONS */

.sa-product-cta-actions {
    display: flex;
    gap: 15px;
    flex-shrink: 0;
}

/* 修复：两个按钮统一 border-box 后，高度均以 border-box 计算，
   download（无边框）与 rfq-button（有边框）实际高度一致，均为 52px */

.sa-product-download,
.sa-product-rfq-button {
    display: inline-flex;
    align-items: center;
    gap: 10px;
    height: 52px;
    padding: 0 28px;
    font-size: 14px;
    font-weight: 600;
    text-decoration: none;
}

.sa-product-download {
    background: var(--sa-white);
    color: var(--sa-primary);
    transition:
        background-color var(--sa-transition),
        color var(--sa-transition);
}

.sa-product-rfq-button {
    border: 1px solid rgba(var(--sa-white-rgb), 0.7);
    color: var(--sa-white);
    transition:
        background-color var(--sa-transition),
        color var(--sa-transition),
        border-color var(--sa-transition);
}

.sa-product-download:hover {
    background: #e8f0f7;
    color: var(--sa-primary);
}

.sa-product-rfq-button:hover {
    background: var(--sa-white);
    color: var(--sa-primary);
}

/* =========================================================
   RFQ
   ========================================================= */

.sa-product-rfq-section {
    padding: 110px 0;
    background: var(--sa-bg-light);
}

.sa-product-rfq-container {
    max-width: 900px;
    margin: auto;
    padding: 0 30px;
}

.sa-product-rfq-header {
    text-align: center;
    margin-bottom: 45px;
}

.sa-product-rfq-header h2 {
    font-size: 42px;
    color: var(--sa-heading-dark);
    margin: 15px 0;
}

.sa-product-rfq-header p {
    color: var(--sa-body-text);
    font-size: 16px;
}

/* =========================================================
   RELATED PRODUCTS
   ========================================================= */

.sa-product-related {
    padding: 100px 0;
    background: var(--sa-white);
}

.sa-product-related-container {
    max-width: 1590px;
    margin: auto;
    padding: 0 30px;
}

.sa-product-related-header {
    text-align: center;
    margin-bottom: 55px;
}

.sa-product-related-header h2 {
    font-size: 42px;
    color: var(--sa-heading-dark);
}

.sa-product-related-grid {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: 25px;
}

.sa-product-related-card {
    border: 1px solid #e1e8ee;
    transition:
        transform 0.3s ease,
        box-shadow 0.3s ease;
}

.sa-product-related-card:hover {
    transform: translateY(-6px);
    box-shadow: 0 15px 35px rgba(0, 0, 0, 0.08);
}

.sa-product-related-card a {
    text-decoration: none;
    display: block;
    padding-bottom: 25px;
}

.sa-product-related-image {
    height: 180px;
    overflow: hidden;
}

.sa-product-related-image img {
    width: 100%;
    height: 100%;
    object-fit: cover;
}

.sa-product-related-card h3 {
    margin: 20px 20px 10px;
    font-size: 18px;
    color: var(--sa-heading);
}

.sa-product-related-card span {
    margin-left: 20px;
    font-size: 13px;
    font-weight: 700;
    color: var(--sa-accent);
}

/* TABLET */

@media (max-width: 1024px) {
    .sa-product-cta-box {
        flex-direction: column;
        align-items: flex-start;
    }

    .sa-product-related-grid {
        grid-template-columns: repeat(2, 1fr);
    }
}

/* MOBILE */

@media (max-width: 767px) {
    .sa-product-cta {
        padding: 60px 0 70px;
    }

    .sa-product-cta-container {
        padding: 0 20px;
    }

    .sa-product-cta-box {
        padding: 35px 25px;
    }

    .sa-product-cta-content h2 {
        font-size: 30px;
    }

    .sa-product-cta-actions {
        flex-direction: column;
        width: 100%;
    }

    .sa-product-download,
    .sa-product-rfq-button {
        justify-content: center;
        width: 100%;
    }

    .sa-product-rfq-container {
        padding: 0 20px;
    }

    .sa-product-rfq-header h2 {
        font-size: 32px;
    }

    .sa-product-related {
        padding: 70px 0;
    }

    .sa-product-related-container {
        padding: 0 20px;
    }

    .sa-product-related-grid {
        grid-template-columns: 1fr;
    }
}

/* =========================================================
   FAQ DISPLAY
   ========================================================= */

.sa-product-faq {
    padding: 100px 0;
    background: var(--sa-bg-light);
}

.sa-product-faq-container {
    max-width: 1000px;
    margin: auto;
    padding: 0 30px;
}

.sa-product-faq-list {
    margin-top: 50px;
}

.sa-product-faq-item {
    background: var(--sa-white);
    padding: 30px;
    margin-bottom: 20px;
    border-left: 3px solid var(--sa-accent);
}

.sa-product-faq-item h3 {
    margin: 0 0 15px;
    font-size: 20px;
    color: var(--sa-heading);
}

.sa-product-faq-item p {
    margin: 0;
    font-size: 15px;
    line-height: 1.75;
    color: var(--sa-body-text);
}

/* Rich FAQ answers parsed from the MD "FAQ" section (module 18).
   The body may contain <p> / <ul> / <li> / <a> / <strong> instead of a
   single paragraph, so keep consistent typography across all of them. */
.sa-product-faq-answer {
    font-size: 15px;
    line-height: 1.75;
    color: var(--sa-body-text);
}

.sa-product-faq-answer p {
    margin: 0 0 12px;
}

.sa-product-faq-answer p:last-child {
    margin-bottom: 0;
}

.sa-product-faq-answer ul,
.sa-product-faq-answer ol {
    margin: 0 0 12px;
    padding-left: 20px;
}

.sa-product-faq-answer li {
    margin-bottom: 6px;
}

.sa-product-faq-answer a {
    color: var(--sa-accent);
    text-decoration: underline;
    text-underline-offset: 2px;
}

.sa-product-faq-answer a:hover {
    color: #174d80;
}

@media (max-width: 767px) {
    .sa-product-faq {
        padding: 70px 0;
    }

    .sa-product-faq-container {
        padding: 0 20px;
    }
}

/* =========================================================
   USP STRIP（样板页模块 02 服务承诺条）
   Hero 正下方 3 项承诺，第一屏建立信任
   ========================================================= */

.sa-product-usp {
    padding: 70px 0 55px;
    background: var(--sa-white);
}

.sa-product-usp-container {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 50px;
    max-width: 1290px;
    margin: 0 auto;
    padding: 0 30px;
}

.sa-product-usp-item {
    display: flex;
    align-items: flex-start;
    gap: 22px;
}

.sa-product-usp-icon {
    flex: 0 0 78px;
    width: 78px;
    height: 78px;
    display: flex;
    align-items: center;
    justify-content: center;
    background: rgba(var(--sa-primary-rgb), 0.06);
    border-radius: 50%;
}

.sa-product-usp-icon svg {
    width: 36px;
    height: 36px;
    fill: none;
    stroke: var(--sa-accent);
    stroke-width: 1.6;
    stroke-linecap: round;
    stroke-linejoin: round;
}

.sa-product-usp-item h3 {
    margin: 4px 0 10px;
    color: var(--sa-heading-dark);
    font-size: 19px;
    font-weight: 700;
    line-height: 1.3;
}

.sa-product-usp-item p {
    margin: 0;
    color: var(--sa-body-text);
    font-size: 16px;
    line-height: 1.6;
}

@media (max-width: 1024px) {
    .sa-product-usp-container {
        grid-template-columns: repeat(3, 1fr);
        gap: 30px;
    }
}

@media (max-width: 767px) {
    .sa-product-usp {
        padding: 50px 0 40px;
    }

    .sa-product-usp-container {
        grid-template-columns: 1fr;
        gap: 32px;
        padding: 0 20px;
    }
}

/* =========================================================
   PRODUCT OVERVIEW（样板页模块 04 图文分栏）
   左文右图，产品总览导语
   ========================================================= */

.sa-product-overview {
    padding: 90px 0;
    background: var(--sa-bg-light);
}

.sa-product-overview-container {
    display: grid;
    grid-template-columns: minmax(0, 1fr) minmax(0, 1fr);
    gap: 80px;
    align-items: center;
    max-width: 1290px;
    margin: 0 auto;
    padding: 0 30px;
}

.sa-product-overview-content .sa-product-section-eyebrow {
    text-align: left;
    margin-bottom: 14px;
}

.sa-product-overview-content h2 {
    margin: 0 0 24px;
    color: var(--sa-heading-dark);
    font-size: 50px;
    font-weight: 600;
    line-height: 1.2;
    text-wrap: balance;
}

.sa-product-overview-content p {
    margin: 0 0 20px;
    color: var(--sa-body-text);
    font-size: 17px;
    line-height: 1.75;
}

.sa-product-overview-button {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: 10px;
    min-height: 54px;
    margin-top: 14px;
    padding: 0 34px;
    border: 1px solid var(--sa-primary);
    border-radius: 40px;
    background: var(--sa-primary);
    color: var(--sa-white);
    font-size: 15px;
    font-weight: 600;
    line-height: 1;
    text-decoration: none;
    transition:
        background-color var(--sa-transition),
        color var(--sa-transition),
        border-color var(--sa-transition),
        transform var(--sa-transition);
}

.sa-product-overview-button:hover {
    background: var(--sa-accent);
    border-color: var(--sa-accent);
    color: var(--sa-white);
    transform: translateY(-2px);
}

.sa-product-overview-button:focus-visible {
    outline: 2px solid var(--sa-accent);
    outline-offset: 3px;
}

.sa-product-overview-image {
    position: relative;
    aspect-ratio: 784 / 620;
    background: var(--sa-bg-muted);
    border-radius: 6px;
    overflow: hidden;
}

.sa-product-overview-image img {
    width: 100%;
    height: 100%;
    object-fit: cover;
    display: block;
}

@media (max-width: 1024px) {
    .sa-product-overview {
        padding: 70px 0;
    }

    .sa-product-overview-container {
        gap: 50px;
    }
}

@media (max-width: 767px) {
    .sa-product-overview {
        padding: 60px 0;
    }

    .sa-product-overview-container {
        grid-template-columns: 1fr;
        gap: 40px;
        padding: 0 20px;
    }

    .sa-product-overview-content h2 {
        font-size: 30px;
    }
}

/* =========================================================
   HOW TO START（样板页模块 15 合作流程 6 步）
   左侧眉标+H2+导语，右侧 6 个编号步骤
   ========================================================= */

.sa-product-start {
    padding: 90px 0;
    background: var(--sa-white);
}

.sa-product-start-container {
    display: grid;
    grid-template-columns: minmax(0, 0.9fr) minmax(0, 1.1fr);
    gap: 80px;
    max-width: 1290px;
    margin: 0 auto;
    padding: 0 30px;
}

.sa-product-start-intro .sa-product-section-eyebrow {
    text-align: left;
    margin-bottom: 14px;
}

.sa-product-start-intro h2 {
    margin: 0 0 22px;
    color: var(--sa-heading-dark);
    font-size: 50px;
    font-weight: 600;
    line-height: 1.2;
    text-wrap: balance;
}

.sa-product-start-intro p {
    margin: 0;
    max-width: 480px;
    color: var(--sa-body-text);
    font-size: 17px;
    line-height: 1.75;
}

.sa-product-start-steps {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 28px 32px;
    align-content: start;
}

.sa-product-step {
    display: flex;
    align-items: flex-start;
    gap: 18px;
}

.sa-product-step-number {
    flex: 0 0 44px;
    width: 44px;
    height: 44px;
    display: flex;
    align-items: center;
    justify-content: center;
    background: var(--sa-primary);
    border-radius: 50%;
    color: var(--sa-white);
    font-size: 17px;
    font-weight: 700;
    line-height: 1;
}

.sa-product-step h3 {
    margin: 2px 0 8px;
    color: var(--sa-heading);
    font-size: 17px;
    font-weight: 700;
    line-height: 1.3;
}

.sa-product-step p {
    margin: 0;
    color: var(--sa-body-text);
    font-size: 15px;
    line-height: 1.65;
}

@media (max-width: 1024px) {
    .sa-product-start-container {
        grid-template-columns: 1fr;
        gap: 50px;
    }

    .sa-product-start-intro p {
        max-width: none;
    }
}

@media (max-width: 767px) {
    .sa-product-start {
        padding: 60px 0;
    }

    .sa-product-start-container {
        padding: 0 20px;
    }

    .sa-product-start-intro h2 {
        font-size: 30px;
    }

    .sa-product-start-steps {
        grid-template-columns: 1fr;
        gap: 26px;
    }
}

/* =========================================================
   TESTIMONIALS（样板页模块 17 客户评价）
   左侧 H2+导语，右侧评价卡
   ========================================================= */

.sa-product-testimonials {
    padding: 90px 0;
    background: var(--sa-white);
}

.sa-product-testimonials-container {
    display: grid;
    grid-template-columns: minmax(0, 0.85fr) minmax(0, 1.15fr);
    gap: 70px;
    align-items: start;
    max-width: 1290px;
    margin: 0 auto;
    padding: 0 30px;
}

.sa-product-testimonials-intro h2 {
    margin: 0 0 20px;
    color: var(--sa-heading-dark);
    font-size: 50px;
    font-weight: 600;
    line-height: 1.2;
    text-wrap: balance;
}

.sa-product-testimonials-intro p {
    margin: 0;
    color: var(--sa-body-text);
    font-size: 17px;
    line-height: 1.75;
}

.sa-product-testimonials-grid {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 28px;
}

.sa-product-testimonial-card {
    padding: 35px 30px 30px;
    background: var(--sa-bg-light);
    border: 1px solid var(--sa-border);
    border-radius: 6px;
    transition:
        transform 0.3s ease,
        box-shadow 0.3s ease;
}

.sa-product-testimonial-card:hover {
    transform: translateY(-5px);
    box-shadow: 0 14px 34px rgba(var(--sa-primary-rgb), 0.10);
}

.sa-product-testimonial-stars {
    margin-bottom: 18px;
    color: #f5a623;
    font-size: 18px;
    letter-spacing: 3px;
    line-height: 1;
}

.sa-product-testimonial-card blockquote {
    margin: 0 0 24px;
    color: var(--sa-body-text);
    font-size: 17px;
    line-height: 1.65;
}

.sa-product-testimonial-author {
    display: flex;
    align-items: center;
    gap: 14px;
}

.sa-product-testimonial-avatar {
    flex: 0 0 50px;
    width: 50px;
    height: 50px;
    display: flex;
    align-items: center;
    justify-content: center;
    background: var(--sa-primary);
    border-radius: 50%;
    color: var(--sa-white);
    font-size: 17px;
    font-weight: 700;
    line-height: 1;
}

.sa-product-testimonial-author h4 {
    margin: 0 0 3px;
    color: var(--sa-heading-dark);
    font-size: 16px;
    font-weight: 700;
    line-height: 1.3;
}

.sa-product-testimonial-author span {
    color: var(--sa-body-text);
    font-size: 14px;
    line-height: 1.4;
}

@media (max-width: 1024px) {
    .sa-product-testimonials-container {
        grid-template-columns: 1fr;
        gap: 45px;
    }
}

@media (max-width: 767px) {
    .sa-product-testimonials {
        padding: 60px 0;
    }

    .sa-product-testimonials-container {
        padding: 0 20px;
    }

    .sa-product-testimonials-intro h2 {
        font-size: 30px;
    }

    .sa-product-testimonials-grid {
        grid-template-columns: 1fr;
        gap: 22px;
    }
}

/* =========================================================
   CERTIFICATIONS（样板页模块 18 资质证书）
   浅灰底，左文，右侧 2×2 认证/标准图标卡片（不展示证书图片）
   ========================================================= */

.sa-product-certifications {
    padding: 90px 0 90px;
    background: var(--sa-bg-light);
}

.sa-product-certifications-container {
    display: grid;
    grid-template-columns: minmax(0, 1.05fr) minmax(0, 0.95fr);
    gap: 80px;
    align-items: center;
    max-width: 1290px;
    margin: 0 auto;
    padding: 0 30px;
}

.sa-product-certifications-content .sa-product-section-eyebrow {
    text-align: left;
    margin-bottom: 14px;
}

.sa-product-certifications-content h2 {
    margin: 0 0 22px;
    color: var(--sa-heading-dark);
    font-size: 50px;
    font-weight: 600;
    line-height: 1.2;
    text-wrap: balance;
}

.sa-product-certifications-content > .sa-product-certifications-content-text {
    margin: 0;
    color: var(--sa-body-text);
    font-size: 17px;
    line-height: 1.75;
}

/* 认证图标卡片墙 */
.sa-product-certifications-cards {
    display: grid;
    grid-template-columns: repeat(2, minmax(0, 1fr));
    gap: 22px;
}

.sa-product-cert-card {
    display: flex;
    flex-direction: column;
    align-items: flex-start;
    gap: 14px;
    padding: 28px 26px;
    background: var(--sa-white);
    border: 1px solid var(--sa-border);
    border-radius: 8px;
    transition:
        border-color var(--sa-transition),
        box-shadow var(--sa-transition);
}

.sa-product-cert-card:hover {
    border-color: var(--sa-accent);
    box-shadow: 0 10px 30px rgba(15, 53, 94, 0.08);
}

.sa-product-cert-card-icon {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    width: 52px;
    height: 52px;
    border-radius: 50%;
    background: rgba(31, 95, 156, 0.08);
}

.sa-product-cert-card-icon svg {
    width: 26px;
    height: 26px;
    fill: none;
    stroke: var(--sa-accent);
    stroke-width: 1.6;
    stroke-linecap: round;
    stroke-linejoin: round;
}

.sa-product-cert-card-code {
    color: var(--sa-heading-dark);
    font-size: 18px;
    font-weight: 700;
    line-height: 1.3;
}

.sa-product-cert-card-label {
    margin: 0;
    color: var(--sa-body-text);
    font-size: 14px;
    line-height: 1.6;
}

@media (max-width: 1024px) {
    .sa-product-certifications-container {
        gap: 50px;
    }

    .sa-product-certifications-cards {
        gap: 18px;
    }
}

@media (max-width: 767px) {
    .sa-product-certifications {
        padding: 60px 0;
    }

    .sa-product-certifications-container {
        grid-template-columns: 1fr;
        gap: 40px;
        padding: 0 20px;
    }

    .sa-product-certifications-content h2 {
        font-size: 30px;
    }

    .sa-product-certifications-cards {
        gap: 14px;
    }

    .sa-product-cert-card {
        gap: 10px;
        padding: 20px 18px;
    }

    .sa-product-cert-card-icon {
        width: 44px;
        height: 44px;
    }

    .sa-product-cert-card-icon svg {
        width: 22px;
        height: 22px;
    }

    .sa-product-cert-card-code {
        font-size: 15px;
    }
}

/* =========================================================
   ACCESSIBILITY
   键盘焦点样式（WCAG 2.1 — 2.4.7 Focus Visible）
   ========================================================= */

/* 深色背景上的交互元素 — 白色焦点环 */
.sa-product-why-button:focus-visible,
.sa-product-applications-button:focus-visible,
.sa-product-rfq-button:focus-visible {
    outline: 2px solid var(--sa-white);
    outline-offset: 3px;
}

/* 浅色背景上的交互元素 — 品牌色焦点环 */
.sa-product-hero-button:focus-visible,
.sa-product-download:focus-visible,
.sa-product-form-link:focus-visible,
.sa-product-related-card a:focus-visible {
    outline: 2px solid var(--sa-accent);
    outline-offset: 3px;
}

/* =========================================================
   REDUCED MOTION
   尊重系统"减弱动态效果"设置
   ========================================================= */

@media (prefers-reduced-motion: reduce) {
    *,
    *::before,
    *::after {
        animation-duration: 0.01ms !important;
        animation-iteration-count: 1 !important;
        transition-duration: 0.01ms !important;
        scroll-behavior: auto !important;
    }
}