/* ========================================
   产品与服务页专用样式
   ======================================== */

.products-page {
    padding-top: calc(72px + env(safe-area-inset-top, 0px));
}

/* 产品分类导航 */
.product-nav {
    background: var(--color-bg-light);
    padding: var(--spacing-lg) 0;
    position: sticky;
    top: 0;
    z-index: 100;
}

.product-nav-tabs {
    display: flex;
    gap: var(--spacing-md);
    justify-content: center;
    flex-wrap: wrap;
}

.nav-tab {
    padding: 12px 24px;
    border-radius: 30px;
    cursor: pointer;
    transition: var(--transition-normal);
    font-weight: 600;
    border: 2px solid transparent;
}

.nav-tab:hover,
.nav-tab.active {
    background: var(--color-brand-blue);
    color: var(--color-white);
}

/* 产品详情 */
.product-detail {
    margin-bottom: var(--spacing-xl);
}

/* —— P0+P2：BBIMS Hero —— */
.bbims-hero-band {
    padding: var(--spacing-xl) 0 var(--spacing-lg);
    border-bottom: 1px solid rgba(15, 52, 96, 0.06);
    background-color: var(--surface-page);
    background-image:
        radial-gradient(ellipse 90% 55% at 12% 0%, rgba(16, 176, 252, 0.1), transparent 52%),
        radial-gradient(ellipse 70% 45% at 95% 100%, rgba(15, 52, 96, 0.06), transparent 50%);
}

.bbims-hero {
    display: grid;
    grid-template-columns: minmax(0, 1.08fr) minmax(0, 0.92fr);
    gap: var(--spacing-xl);
    align-items: center;
}

.bbims-hero__copy h1 {
    font-size: var(--font-size-h2-page);
    margin-bottom: var(--spacing-md);
    color: var(--color-text-heading);
}

.bbims-hero__copy .tagline {
    font-size: var(--font-size-tagline);
    color: var(--color-brand-blue);
    margin-bottom: var(--spacing-md);
    font-weight: 600;
}

.bbims-hero__copy .description {
    font-size: var(--font-size-lead);
    line-height: var(--leading-loose);
    color: var(--color-text-body);
    margin-bottom: var(--spacing-lg);
}

.bbims-hero__actions {
    display: flex;
    flex-wrap: wrap;
    gap: var(--spacing-sm);
}

.bbims-hero__cta {
    font-size: var(--font-size-tagline);
    font-weight: 700;
    padding: 14px 36px;
    border-radius: 10px;
}

/* P1：双视频 Tab */
.bbims-video-tabs__nav {
    display: flex;
    flex-wrap: wrap;
    gap: var(--spacing-xs);
    margin-bottom: var(--spacing-sm);
}

.bbims-video-tabs__tab {
    padding: 8px 18px;
    font-family: inherit;
    font-size: var(--font-size-sm);
    font-weight: 600;
    color: var(--color-text-muted);
    background: rgba(15, 52, 96, 0.06);
    border: 1px solid rgba(15, 52, 96, 0.1);
    border-radius: 999px;
    cursor: pointer;
    transition:
        color var(--transition-fast),
        background-color var(--transition-fast),
        border-color var(--transition-fast);
}

.bbims-video-tabs__tab:hover {
    color: var(--color-industrial-blue);
    border-color: rgba(16, 176, 252, 0.35);
}

.bbims-video-tabs__tab[aria-selected="true"] {
    color: var(--color-white);
    background: linear-gradient(145deg, var(--color-primary-blue), #0891d4);
    border-color: transparent;
    box-shadow: 0 4px 14px rgba(16, 176, 252, 0.35);
}

.bbims-video-tabs__panel {
    position: relative;
    aspect-ratio: 16 / 9;
    max-height: min(420px, 42vh);
    border-radius: 12px;
    overflow: hidden;
    background: var(--color-primary-dark);
    box-shadow:
        0 12px 40px rgba(15, 52, 96, 0.14),
        0 0 0 1px rgba(15, 52, 96, 0.08);
}

.bbims-video-tabs__video {
    display: block;
    width: 100%;
    height: 100%;
    object-fit: contain;
    background: var(--color-primary-dark);
}

.bbims-video-tabs__video[hidden] {
    display: none;
}

/* —— P0+P3：痛点通栏 —— */
.bbims-pain-band {
    padding: var(--spacing-xl) 0;
}

.bbims-pain-band__inner {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 var(--spacing-md);
    box-sizing: border-box;
}

.bbims-pain-band .heading-block-center {
    margin-bottom: var(--spacing-sm);
}

.bbims-pain-band .bbims-pain-row__lead {
    margin-left: auto;
    margin-right: auto;
    text-align: center;
}

.bbims-pain-band .heading-block-center .bbims-pain-row__badge {
    vertical-align: middle;
    margin-right: 12px;
    transform: translateY(-0.06em);
}

.bbims-pain-band .bbims-value-cta {
    margin-top: var(--spacing-lg);
}

/* BBIMS 产品区：醒目行动号召 */
.bbims-value-cta {
    margin-top: var(--spacing-lg);
    padding: var(--spacing-md) var(--spacing-lg);
    border-radius: 14px;
    background:
        linear-gradient(135deg, rgba(16, 176, 252, 0.14) 0%, rgba(15, 52, 96, 0.08) 45%, rgba(8, 145, 212, 0.1) 100%),
        linear-gradient(180deg, #ffffff 0%, #f8fafc 100%);
    border: 1px solid rgba(16, 176, 252, 0.35);
    box-shadow:
        0 10px 40px rgba(15, 52, 96, 0.1),
        0 0 0 1px rgba(255, 255, 255, 0.8) inset;
}

.bbims-value-cta__open {
    margin: 0 0 var(--spacing-xs);
    font-size: var(--font-size-panel-title);
    font-weight: 800;
    line-height: var(--leading-snug);
    letter-spacing: 0.03em;
    color: var(--color-primary-blue);
    text-shadow: 0 0 28px rgba(16, 176, 252, 0.35);
}

.bbims-value-cta__copy {
    margin: 0;
    font-size: var(--font-size-subheading);
    font-weight: 600;
    line-height: var(--leading-relaxed);
    color: var(--color-primary-dark);
}

.bbims-value-cta__name {
    font-weight: 800;
    color: var(--color-industrial-blue);
    white-space: nowrap;
}

@media (max-width: 520px) {
    .bbims-value-cta__name {
        white-space: normal;
    }
}

.bbims-value-cta__actions {
    display: flex;
    flex-wrap: wrap;
    align-items: center;
    gap: var(--spacing-sm);
    margin-top: var(--spacing-md);
}

.bbims-value-cta__btn-trial {
    font-size: var(--font-size-tagline);
    font-weight: 700;
    padding: 16px 40px;
    border-radius: 10px;
    box-shadow:
        0 4px 18px rgba(16, 176, 252, 0.45),
        0 2px 6px rgba(15, 52, 96, 0.12);
    transition:
        transform var(--transition-fast),
        box-shadow var(--transition-normal);
}

.bbims-value-cta__btn-trial:hover {
    transform: translateY(-3px);
    box-shadow:
        0 10px 32px rgba(16, 176, 252, 0.55),
        0 4px 12px rgba(15, 52, 96, 0.15);
}

.bbims-value-cta__btn-demo {
    font-size: var(--font-size-tagline);
    font-weight: 700;
    padding: 14px 36px;
    border-radius: 10px;
    background: transparent;
    color: var(--color-industrial-blue);
    border: 2px solid var(--color-industrial-blue);
    transition:
        background-color var(--transition-normal),
        color var(--transition-normal),
        transform var(--transition-fast),
        box-shadow var(--transition-normal);
}

.bbims-value-cta__btn-demo:hover {
    background: var(--color-industrial-blue);
    color: var(--color-white);
    transform: translateY(-2px);
    box-shadow: 0 8px 24px rgba(15, 52, 96, 0.25);
}

/* BBIMS：痛点卡片矩阵（开发挑战 + AI 痛点，统一 3 列栅格） */
.bbims-pain-row__title {
    font-size: var(--font-size-subheading);
    font-weight: 700;
    margin: 0 0 14px;
    color: var(--color-text-heading);
    line-height: var(--leading-snug);
}

.bbims-pain-row__badge {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    margin-right: 10px;
    padding: 6px 14px;
    min-height: 2rem;
    font-size: var(--font-size-body);
    font-weight: 800;
    letter-spacing: 0.1em;
    color: var(--color-white);
    vertical-align: middle;
    border-radius: 8px;
    background: linear-gradient(135deg, var(--color-primary-blue), #0891d4);
    box-shadow: 0 4px 14px rgba(16, 176, 252, 0.35);
}

.bbims-pain-row__lead {
    margin: 0 auto var(--spacing-md);
    max-width: 46rem;
    padding: 0 var(--spacing-sm);
    font-size: var(--font-size-body);
    line-height: var(--leading-relaxed);
    color: var(--color-text-muted);
}

.bbims-pain-grid {
    display: grid;
    gap: var(--spacing-md);
}

.bbims-pain-grid--3 {
    grid-template-columns: repeat(3, minmax(0, 1fr));
}

.bbims-pain-tile {
    margin: 0;
    padding: 20px 18px;
    border-radius: 12px;
    border: 1px solid rgba(15, 52, 96, 0.08);
    background: var(--color-white);
    box-shadow:
        0 4px 18px rgba(15, 52, 96, 0.08),
        0 1px 4px rgba(15, 52, 96, 0.04);
    box-sizing: border-box;
    transition: transform 0.2s ease, box-shadow 0.2s ease;
}

.bbims-pain-tile:hover {
    transform: translateY(-3px);
    box-shadow:
        0 14px 36px rgba(15, 52, 96, 0.12),
        0 6px 14px rgba(15, 52, 96, 0.07);
}

.bbims-pain-tile__title {
    margin: 0 0 8px;
    font-size: var(--font-size-lead);
    font-weight: 700;
    color: var(--color-primary-dark);
    line-height: var(--leading-snug);
}

.bbims-pain-tile__desc {
    margin: 0;
    font-size: var(--font-size-body);
    line-height: var(--leading-relaxed);
    color: var(--color-text-muted);
}

/* 核心特性：通栏底 + 全框卡片（与可定制系统 / 对比区一致） */
.core-features-band {
    width: 100vw;
    max-width: 100vw;
    margin-left: calc(50% - 50vw);
    /* margin-top: var(--spacing-xl);
    margin-bottom: var(--spacing-lg); */
    padding: var(--spacing-xl) 0;
    box-sizing: border-box;
    overflow-x: hidden;
    background-color: #edf2f8;
    background-image:
        radial-gradient(ellipse 90% 55% at 20% 0%, rgba(16, 176, 252, 0.12), transparent 50%),
        radial-gradient(ellipse 70% 50% at 95% 85%, rgba(15, 52, 96, 0.1), transparent 52%),
        linear-gradient(180deg, #f6f9fc 0%, #e9eef6 48%, #f2f5fa 100%);
    border-top: 1px solid rgba(15, 52, 96, 0.09);
    border-bottom: 1px solid rgba(15, 52, 96, 0.07);
}

.core-features-band__inner {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 var(--spacing-md);
    box-sizing: border-box;
}

.core-features-band .heading-block-center {
    margin-bottom: var(--spacing-sm);
}

/* 「为什么选择我们」：紧跟核心特性通栏之后 */
.why-choose {
    padding: var(--spacing-xl) var(--spacing-lg);
    margin-top: 0;
    margin-bottom: 0;
}

.why-choose.section-band--muted {
    margin-left: calc(50% - 50vw);
    margin-right: calc(50% - 50vw);
    padding-left: max(var(--spacing-md), env(safe-area-inset-left));
    padding-right: max(var(--spacing-md), env(safe-area-inset-right));
    width: 100vw;
    max-width: 100vw;
    box-sizing: border-box;
}

.why-choose .heading-block-center {
    margin-bottom: var(--spacing-lg);
}

.why-choose .card-grid {
    max-width: 1200px;
    margin: 0 auto;
}

.core-features-band__lead {
    max-width: 46rem;
    margin: 0 auto var(--spacing-lg);
    text-align: center;
    font-size: var(--font-size-body);
    line-height: var(--leading-relaxed);
    color: var(--color-text-muted);
}

/* 功能模块栅格 */
.features-list {
    display: grid;
    grid-template-columns: repeat(4, minmax(0, 1fr));
    gap: var(--spacing-md);
    margin-top: 0;
}

.feature-item {
    display: flex;
    flex-direction: column;
    gap: var(--spacing-sm);
    margin: 0;
    padding: var(--spacing-md);
    border-radius: 12px;
    border: 2px solid rgba(16, 176, 252, 0.5);
    background: linear-gradient(160deg, var(--color-white) 0%, #f4f8fc 100%);
    box-shadow:
        0 4px 18px rgba(15, 52, 96, 0.07),
        0 0 0 1px rgba(255, 255, 255, 0.8) inset,
        0 0 16px rgba(16, 176, 252, 0.1);
    box-sizing: border-box;
    transition:
        transform var(--transition-fast),
        box-shadow var(--transition-normal),
        border-color var(--transition-normal);
}

.feature-item:hover {
    transform: translateY(-4px);
    border-color: var(--color-primary-blue);
    box-shadow:
        0 12px 32px rgba(15, 52, 96, 0.11),
        0 0 0 1px rgba(255, 255, 255, 0.85) inset,
        0 0 22px rgba(16, 176, 252, 0.22);
}

.feature-item__icon {
    display: flex;
    align-items: center;
    justify-content: center;
    width: 48px;
    height: 48px;
    border-radius: 12px;
    background: linear-gradient(145deg, rgba(16, 176, 252, 0.18), rgba(15, 52, 96, 0.08));
    color: var(--color-industrial-blue);
}

.feature-item__icon .ad-icon-lg {
    width: 1.35rem;
    height: 1.35rem;
}

.feature-item__icon .ad-icon svg {
    display: block;
}

.feature-item__icon .ad-icon svg path {
    fill: currentColor;
}

.feature-item__icon .ad-icon svg path[stroke] {
    fill: none;
    stroke: currentColor;
}

.feature-item__body {
    min-width: 0;
}

.feature-item h4 {
    margin: 0 0 var(--spacing-xs);
    font-size: var(--font-size-tagline);
    font-weight: 700;
    line-height: var(--leading-snug);
    color: var(--color-primary-dark);
}

.feature-item p {
    margin: 0;
    font-size: var(--font-size-body);
    line-height: var(--leading-relaxed);
    color: var(--color-text-muted);
}

@media (max-width: 992px) {
    .features-list {
        grid-template-columns: repeat(2, minmax(0, 1fr));
    }
}

@media (max-width: 560px) {
    .features-list {
        grid-template-columns: 1fr;
    }
}

/* BBIMS 平台优势对比（与全站卡片 / 通栏风格一致） */
.comparison-section {
    background: var(--color-bg-light);
    padding: var(--spacing-xl) 0;
}

.platform-comparison {
    padding: var(--spacing-xl) 0;
    margin-top: var(--spacing-lg);
    margin-bottom: var(--spacing-xl);
}

.platform-comparison.section-band--page {
    margin-left: calc(50% - 50vw);
    margin-right: calc(50% - 50vw);
    padding-left: max(var(--spacing-md), env(safe-area-inset-left));
    padding-right: max(var(--spacing-md), env(safe-area-inset-right));
    width: 100vw;
    max-width: 100vw;
    box-sizing: border-box;
}

.platform-comparison__inner {
    max-width: 54rem;
    margin-inline: auto;
}

.platform-comparison .heading-block-center {
    margin-bottom: var(--spacing-sm);
}

.platform-comparison__lead {
    max-width: 46rem;
    margin: 0 auto var(--spacing-lg);
    text-align: center;
    font-size: var(--font-size-body);
    line-height: var(--leading-relaxed);
    color: var(--color-text-muted);
}

.comparison-container {
    display: grid;
    grid-template-columns: repeat(2, minmax(0, 1fr));
    gap: clamp(1.25rem, 2.5vw, 2rem);
    align-items: stretch;
}

.comparison-card {
    position: relative;
    display: flex;
    flex-direction: column;
    margin: 0;
    padding: var(--spacing-lg) clamp(1.25rem, 2.5vw, 1.75rem);
    border-radius: 14px;
    box-sizing: border-box;
    transition:
        transform var(--transition-normal),
        box-shadow var(--transition-normal),
        border-color var(--transition-normal);
}

.comparison-card--legacy {
    border: 2px solid rgba(15, 52, 96, 0.14);
    background: linear-gradient(180deg, #fafbfc 0%, #eef1f5 100%);
    box-shadow:
        0 4px 22px rgba(15, 52, 96, 0.06),
        0 0 0 1px rgba(255, 255, 255, 0.75) inset;
}

.comparison-card--bbims,
.comparison-card.bbims {
    border: 2px solid rgba(16, 176, 252, 0.55);
    background: linear-gradient(155deg, var(--color-white) 0%, #f0f9ff 52%, #f6fcff 100%);
    box-shadow:
        0 8px 32px rgba(15, 52, 96, 0.1),
        0 0 0 1px rgba(255, 255, 255, 0.85) inset,
        0 0 26px rgba(16, 176, 252, 0.16);
}

.comparison-card__eyebrow {
    margin: 0 0 var(--spacing-xs);
    font-size: var(--font-size-xs);
    font-weight: 700;
    letter-spacing: 0.08em;
    color: var(--color-text-soft);
}

.comparison-card.bbims .comparison-card__eyebrow,
.comparison-card--bbims .comparison-card__eyebrow {
    color: var(--color-primary-blue);
}

.comparison-card__title {
    margin: 0 0 var(--spacing-md);
    font-size: var(--font-size-panel-title);
    font-weight: 700;
    line-height: var(--leading-snug);
    color: var(--color-primary-dark);
}

.comparison-card.bbims .comparison-card__title,
.comparison-card--bbims .comparison-card__title {
    color: var(--color-industrial-blue);
}

.comparison-list {
    margin: 0;
    padding: 0;
    list-style: none;
    flex: 1 1 auto;
}

.comparison-list li {
    display: flex;
    align-items: flex-start;
    gap: 12px;
    padding: 12px 0;
    border-bottom: 1px solid rgba(15, 52, 96, 0.08);
    font-size: var(--font-size-body);
    line-height: var(--leading-relaxed);
    color: var(--color-text-body);
}

.comparison-list li:last-child {
    border-bottom: none;
    padding-bottom: 0;
}

.comparison-list.traditional li::before {
    content: '✗';
    flex: 0 0 24px;
    width: 24px;
    height: 24px;
    margin-top: 2px;
    border-radius: 50%;
    font-size: var(--font-size-xs);
    font-weight: 800;
    line-height: 24px;
    text-align: center;
    color: var(--color-text-hint);
    background: rgba(15, 52, 96, 0.08);
}

.comparison-list.bbims li::before {
    content: '✓';
    flex: 0 0 24px;
    width: 24px;
    height: 24px;
    margin-top: 2px;
    border-radius: 50%;
    font-size: var(--font-size-xs);
    font-weight: 800;
    line-height: 24px;
    text-align: center;
    color: var(--color-white);
    background: linear-gradient(145deg, var(--color-primary-blue), #0891d4);
    box-shadow: 0 2px 8px rgba(16, 176, 252, 0.35);
}

.service-tag {
    background: var(--color-white);
    border: 2px solid var(--color-brand-blue);
    padding: var(--spacing-md);
    border-radius: 8px;
    text-align: center;
    transition: var(--transition-normal);
    cursor: pointer;
}

.service-tag:hover {
    background: var(--color-brand-blue);
    color: var(--color-white);
    transform: scale(1.05);
}

.service-tag h4 {
    margin-bottom: var(--spacing-xs);
}

.service-tag p {
    font-size: var(--font-size-sm);
    opacity: 0.8;
}

/* 可定制系统类型（BBIMS）：通栏工业风底纹 + 版心内栅格 */
/* 通栏用 margin-left 拉出；勿用 transform 居中，避免与 .fade-in 的 translateY 互相覆盖导致右偏 */
.custom-systems {
    position: relative;
    width: 100vw;
    max-width: 100vw;
    margin-left: calc(50% - 50vw);
    /* margin-top: var(--spacing-lg);
    margin-bottom: var(--spacing-xl); */
    padding: var(--spacing-xl) 0;
    box-sizing: border-box;
    overflow-x: hidden;
    background-color: #e6edf6;
    background-image:
        radial-gradient(ellipse 110% 70% at 50% -25%, rgba(16, 176, 252, 0.22), transparent 58%),
        radial-gradient(ellipse 55% 50% at 100% 100%, rgba(15, 52, 96, 0.14), transparent 55%),
        radial-gradient(ellipse 45% 42% at 0% 95%, rgba(16, 176, 252, 0.1), transparent 52%),
        repeating-linear-gradient(
            -14deg,
            transparent 0,
            transparent 32px,
            rgba(15, 52, 96, 0.028) 32px,
            rgba(15, 52, 96, 0.028) 33px
        ),
        linear-gradient(185deg, #f5f9fc 0%, #e8eff8 45%, #f2f6fb 100%);
    border-top: 1px solid rgba(15, 52, 96, 0.1);
    border-bottom: 1px solid rgba(15, 52, 96, 0.08);
    box-shadow: inset 0 1px 0 rgba(255, 255, 255, 0.65);
}

.custom-systems__inner {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 var(--spacing-md);
    box-sizing: border-box;
}

.custom-systems__lead {
    max-width: 46rem;
    margin: -4px auto var(--spacing-lg);
    padding: 0 var(--spacing-sm);
    text-align: center;
    font-size: var(--font-size-body);
    line-height: var(--leading-relaxed);
    color: var(--color-text-muted);
}

.custom-systems__grid {
    display: grid;
    grid-template-columns: repeat(3, minmax(0, 1fr));
    gap: var(--spacing-md);
}

.custom-systems__grid .service-tag {
    position: relative;
    text-align: left;
    padding: var(--spacing-md);
    border-radius: 12px;
    border: 2px solid rgba(16, 176, 252, 0.55);
    background: linear-gradient(155deg, var(--color-white) 0%, #f4f8fc 100%);
    box-shadow:
        0 4px 20px rgba(15, 52, 96, 0.07),
        0 0 0 1px rgba(255, 255, 255, 0.75) inset,
        0 0 18px rgba(16, 176, 252, 0.14);
    transition:
        transform var(--transition-fast),
        box-shadow var(--transition-normal),
        border-color var(--transition-normal),
        background 0.25s ease;
}

.custom-systems__grid .service-tag:hover {
    transform: translateY(-4px);
    border-color: var(--color-primary-blue);
    background: linear-gradient(155deg, var(--color-white) 0%, #f0f9ff 100%);
    box-shadow:
        0 14px 40px rgba(15, 52, 96, 0.12),
        0 0 0 1px rgba(255, 255, 255, 0.8) inset,
        0 0 28px rgba(16, 176, 252, 0.32),
        0 0 0 1px rgba(16, 176, 252, 0.35);
    color: var(--color-primary-dark);
}

.custom-systems__grid .service-tag:hover h4 {
    color: var(--color-industrial-blue);
}

.custom-systems__grid .service-tag:hover .service-tag__hint {
    color: var(--color-text-muted);
}

.custom-systems__grid .service-tag h4 {
    margin: 0 0 var(--spacing-xs);
    font-size: var(--font-size-lead);
    font-weight: 700;
    line-height: var(--leading-snug);
    color: var(--color-primary-dark);
}

.service-tag__abbr {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    min-height: 1.75rem;
    padding: 2px 10px;
    margin-bottom: 10px;
    font-size: var(--font-size-xs);
    font-weight: 800;
    letter-spacing: 0.08em;
    color: var(--color-industrial-blue);
    background: rgba(16, 176, 252, 0.14);
    border-radius: 6px;
}

.service-tag__hint {
    margin: 0;
    font-size: var(--font-size-xs);
    line-height: var(--leading-normal);
    color: var(--color-text-soft);
    opacity: 1;
}

@media (max-width: 900px) {
    .custom-systems__grid {
        grid-template-columns: repeat(2, minmax(0, 1fr));
    }
}

@media (max-width: 520px) {
    .custom-systems__grid {
        grid-template-columns: 1fr;
    }
}

/* P2：痛点区 fade-in 阶梯 */
.bbims-pain-band .bbims-pain-grid .bbims-pain-tile.fade-in:nth-child(1) { transition-delay: 0s; }
.bbims-pain-band .bbims-pain-grid .bbims-pain-tile.fade-in:nth-child(2) { transition-delay: 0.04s; }
.bbims-pain-band .bbims-pain-grid .bbims-pain-tile.fade-in:nth-child(3) { transition-delay: 0.08s; }
.bbims-pain-band .bbims-pain-grid .bbims-pain-tile.fade-in:nth-child(4) { transition-delay: 0.12s; }
.bbims-pain-band .bbims-pain-grid .bbims-pain-tile.fade-in:nth-child(5) { transition-delay: 0.16s; }
.bbims-pain-band .bbims-pain-grid .bbims-pain-tile.fade-in:nth-child(6) { transition-delay: 0.2s; }

@media (prefers-reduced-motion: reduce) {
    .bbims-pain-band .bbims-pain-tile.fade-in {
        transition-delay: 0s !important;
    }
}

/* 响应式调整 */
@media (max-width: 992px) {
    .bbims-pain-grid--3 {
        grid-template-columns: repeat(2, minmax(0, 1fr));
    }
}

@media (max-width: 560px) {
    .bbims-pain-grid--3 {
        grid-template-columns: 1fr;
    }
}

@media (max-width: 1024px) {
    .bbims-hero {
        grid-template-columns: 1fr;
        gap: var(--spacing-lg);
    }

    .bbims-hero__copy h1 {
        font-size: var(--font-size-product-detail-h2);
    }

    .bbims-hero__copy .description {
        text-align: left;
    }

    .bbims-video-tabs__panel {
        max-height: min(380px, 48vh);
    }

    .comparison-card {
        padding: var(--spacing-md);
    }

    .core-features-band__inner {
        padding-left: var(--spacing-sm);
        padding-right: var(--spacing-sm);
    }
}

@media (max-width: 768px) {
    .bbims-hero-band {
        padding: var(--spacing-lg) 0;
    }

    .bbims-pain-band {
        padding: var(--spacing-lg) 0;
    }

    /* 通栏 100vw + 负 margin 在部分移动浏览器会宽于 layout viewport，导致整页右移露白 */
    .core-features-band,
    .custom-systems,
    .platform-comparison.section-band--page,
    .why-choose.section-band--muted {
        width: 100%;
        max-width: 100%;
        margin-left: 0;
        margin-right: 0;
    }

    .comparison-container {
        grid-template-columns: 1fr;
    }

    .features-list {
        grid-template-columns: repeat(2, minmax(0, 1fr));
    }
}

@media (max-width: 560px) {
    .features-list {
        grid-template-columns: 1fr;
    }

    .platform-comparison__lead,
    .core-features-band__lead {
        padding: 0 var(--spacing-xs);
    }

    .why-choose .card-grid {
        gap: var(--spacing-md);
    }
}