/* ==============================================================
   home.css · 首页专属样式
   --------------------------------------------------------------
   5 屏整页滚动布局：
   1. Hero（左标题 + 右 RHH logo）
   2. About RHH（三点项目列表 + 配图占位）
   3. Our Advantages（3 个数据卡片）
   4. Our Cases（3 个案例卡片）
   5. Contact CTA + Footer
   ============================================================== */

/* ==============================================================
   1. 整页滚动容器
   ============================================================== */

.fullpage {
    height: 100vh;
    height: 100dvh;
    overflow-y: auto;
    scroll-snap-type: y mandatory;
    scroll-behavior: smooth;
    -webkit-overflow-scrolling: touch;
}

.fp-screen {
    min-height: 100vh;
    min-height: 100dvh;
    scroll-snap-align: start;
    display: flex;
    flex-direction: column;
    justify-content: center;
    position: relative;
    overflow: hidden;
    background-color: var(--color-bg-dark);
    color: var(--color-text-inverse);
}

.fp-screen__inner {
    width: 100%;
    padding-block: var(--space-16);
}

@media (min-width: 768px) {
    .fp-screen__inner {
        padding-block: var(--space-12);
    }
}

@media (min-width: 1025px) {
    .fp-screen__inner {
        padding-block: var(--space-10);
    }
}

/* ==============================================================
   2. 右侧圆点导航
   ============================================================== */

.fp-nav {
    position: fixed;
    right: var(--space-5);
    top: 50%;
    transform: translateY(-50%);
    z-index: var(--z-sticky);
    display: none;
}

@media (min-width: 1025px) {
    .fp-nav {
        display: block;
    }
}

.fp-nav__list {
    display: flex;
    flex-direction: column;
    gap: var(--space-4);
}

.fp-nav__dot {
    display: block;
    width: 10px;
    height: 10px;
    border-radius: var(--radius-full);
    background-color: rgba(255, 255, 255, 0.3);
    border: 2px solid rgba(255, 255, 255, 0.3);
    transition: background-color var(--transition-base),
    border-color var(--transition-base),
    transform var(--transition-base);
}

.fp-nav__dot:hover {
    background-color: var(--color-accent);
    border-color: var(--color-accent);
    transform: scale(1.3);
}

.fp-nav__dot.is-active {
    background-color: var(--color-accent);
    border-color: var(--color-accent);
    transform: scale(1.2);
}

/* ==============================================================
   3. Hero（Screen 1）
   背景图 + 蒙层 + 左侧文字（RHH/CONSULTING/标签由 banner.png 提供）
   ============================================================== */

.fp-screen--hero {
    padding-top: 0;
    justify-content: center;
}

.hero {
    position: relative;
    width: 100%;
    height: 100vh;
    height: 100dvh;
    display: flex;
    align-items: center;
    background-color: var(--color-bg-dark);
    overflow: hidden;
}

.hero__bg {
    position: absolute;
    top: 0;
    right: 0;
    bottom: 0;
    left: 0;
    /* 拉伸铺满整个 hero 区域，消除上下空白 */
    background-size: 100% 100%;
    background-position: center;
    background-repeat: no-repeat;
    z-index: 0;
    animation: hero-zoom 20s ease-in-out infinite alternate;
}

@keyframes hero-zoom {
    0% {
        transform: scale(1);
    }
    100% {
        transform: scale(1.04);
    }
}

.hero__overlay {
    position: absolute;
    top: 0;
    right: 0;
    bottom: 0;
    left: 0;
    /* 蒙版已临时关闭，方便查看原图效果 */
    background: none;
    z-index: 1;
}

.hero__inner {
    position: relative;
    z-index: 2;
    display: flex;
    align-items: center;
    width: 100%;
    padding-top: var(--header-height-mobile);
    padding-bottom: var(--space-8);
}

/* 左：标题 + 副标题 + CTA */
.hero__content {
    display: flex;
    flex-direction: column;
    gap: var(--space-5);
    max-width: 60ch;
    animation: fade-in-up 0.8s ease 0.2s both;
}

.hero__title {
    font-size: clamp(1.75rem, 4.2vw, 3.25rem);
    font-weight: var(--font-weight-bold);
    line-height: 1.1;
    letter-spacing: var(--letter-spacing-tight);
    text-transform: uppercase;
    background: linear-gradient(90deg, #ffffff 0%, #0095ff 100%);
    -webkit-background-clip: text;
    background-clip: text;
    -webkit-text-fill-color: transparent;
    color: transparent;
    margin: 0;
}

.hero__lead {
    color: #ffffff;
    font-size: var(--font-size-md);
    line-height: var(--line-height-relaxed);
    max-width: 44ch;
    margin: 0;
}

.hero__content .btn {
    align-self: flex-start;
    margin-top: var(--space-3);
    background-color: transparent;
    color: #ffffff;
    border-color: #ffffff;
}

.hero__content .btn:hover {
    background-color: #ffffff;
    color: var(--color-bg-dark);
    border-color: #ffffff;
}

/* 向下滚动提示 */
.scroll-hint {
    position: absolute;
    bottom: var(--space-6);
    left: 50%;
    transform: translateX(-50%);
    z-index: 3;
}

.scroll-hint__line {
    display: block;
    width: 2px;
    height: 40px;
    background: linear-gradient(180deg, var(--color-accent) 0%, transparent 100%);
    animation: scroll-bounce 2s ease infinite;
}

@keyframes scroll-bounce {
    0%, 100% {
        transform: translateY(0);
        opacity: 0.6;
    }
    50% {
        transform: translateY(10px);
        opacity: 1;
    }
}

/* ==============================================================
   4. About（Screen 2）
   ============================================================== */

.fp-screen--about {
    background-color: var(--color-bg-dark);
}

.about-head {
    margin-bottom: var(--space-8);
}

.about-head__top {
    display: flex;
    flex-wrap: wrap;
    align-items: center;
    justify-content: space-between;
    gap: var(--space-4);
    margin-bottom: var(--space-2);
}

.about-head__title {
    font-size: var(--font-size-xl);
    font-weight: var(--font-weight-bold);
    text-transform: uppercase;
    letter-spacing: var(--letter-spacing-wide);
    margin: 0;
    background: linear-gradient(90deg, #ffffff 0%, #0095ff 100%);
    -webkit-background-clip: text;
    background-clip: text;
    -webkit-text-fill-color: transparent;
    color: transparent;
}

.about-head__title span {
    -webkit-text-fill-color: transparent;
    color: transparent;
}

@media (min-width: 768px) {
    .about-head__title {
        font-size: var(--font-size-2xl);
    }
}

.about-head__lead {
    color: var(--color-text-muted);
    font-size: var(--font-size-sm);
    margin: 0;
}

.about-head__btn {
    background-color: transparent;
    color: #ffffff;
    border-color: #ffffff;
    width: 48px;
    height: 48px;
    padding: 0;
    flex: 0 0 48px;
    display: inline-flex;
    align-items: center;
    justify-content: center;
}

.about-head__btn .arrow {
    font-size: var(--font-size-lg);
    line-height: 1;
}

.about-head__btn:hover {
    background-color: #ffffff;
    color: var(--color-bg-dark);
    border-color: #ffffff;
}

.about-grid {
    display: grid;
    grid-template-columns: 1fr;
    gap: var(--space-6);
    align-items: start;
}

@media (min-width: 1025px) {
    .about-grid {
        grid-template-columns: 1.2fr 1fr;
        gap: var(--space-12);
    }
}

.about-grid__text {
    display: flex;
    flex-direction: column;
    gap: var(--space-2);
}

/* 介绍段落 */
.about-intro__item {
    position: relative;
}

.about-intro__para {
    font-size: var(--font-size-base);
    line-height: 1.75;
    color: var(--color-text-muted);
    display: -webkit-box;
    -webkit-line-clamp: 3;
    line-clamp: 3;
    text-align: justify;
    /*-webkit-box-orient: vertical;*/
    /*overflow: hidden;*/
    /*transition: all 0.3s ease;*/
}

.about-intro__item.is-expanded .about-intro__para {
    -webkit-line-clamp: unset;
    line-clamp: unset;
    overflow: visible;
}

.about-intro__toggle {
    display: inline-flex;
    align-items: center;
    gap: var(--space-1);
    padding: var(--space-1) 0;
    font-size: var(--font-size-sm);
    color: var(--color-accent);
    background: none;
    border: none;
    cursor: pointer;
    transition: color var(--transition-base);
}

.about-intro__toggle:hover {
    color: var(--color-accent-2);
}

.about-intro__arrow {
    display: inline-block;
    transition: transform 0.3s ease;
}

.about-intro__item.is-expanded .about-intro__arrow {
    transform: rotate(180deg);
}

@media (min-width: 768px) {
    .about-intro__para {
        line-height: 1.8;
    }
}

/* 手风琴 TODO LIST */
.accordion {
    display: flex;
    flex-direction: column;
}

.accordion-item {
    border-bottom: 1px solid rgba(255, 255, 255, 0.15);
}

.accordion-item:last-child {
    border-bottom: 1px solid rgba(255, 255, 255, 0.15);
}

.accordion-header {
    width: 100%;
    display: flex;
    align-items: center;
    gap: var(--space-3);
    padding: var(--space-4) 0;
    background: transparent;
    border: 0;
    cursor: pointer;
    text-align: left;
    color: #ffffff;
    transition: color var(--transition-base);
}

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

.accordion-icon {
    width: 18px;
    height: 18px;
    flex: 0 0 18px;
    transition: transform var(--transition-base);
    display: block;
}

.accordion-item.is-open .accordion-icon {
    transform: rotate(90deg);
}

.accordion-title {
    font-size: var(--font-size-sm);
    font-weight: var(--font-weight-semibold);
    text-transform: uppercase;
    letter-spacing: var(--letter-spacing-wide);
    margin: 0;
    color: inherit;
    flex: 1;
}

.accordion-body {
    max-height: 0;
    overflow: hidden;
    transition: max-height var(--transition-base);
}

.accordion-item.is-open .accordion-body {
    max-height: 600px;
}

.accordion-list {
    list-style: none;
    padding: 0 0 var(--space-5) 0;
    margin: 0;
    display: flex;
    flex-direction: column;
    gap: var(--space-2);
    color: var(--color-text-muted);
    font-size: var(--font-size-sm);
    line-height: var(--line-height-relaxed);
}

.accordion-list li {
    position: relative;
    padding-left: var(--space-5);
}

.accordion-list li::before {
    content: "•";
    position: absolute;
    left: 0;
    top: 0;
    color: var(--color-text-muted);
    font-size: 1.1em;
    line-height: var(--line-height-relaxed);
}

/* 右侧图片 */
.about-grid__media {
    display: flex;
    align-items: stretch;
}

.about-grid__img {
    /* width: 100%;
    height: 100%;
    min-height: 280px;
    object-fit: cover;
    border-radius: var(--radius-sm);
    display: block; */
}

@media (min-width: 1025px) {
    .about-grid__img {
        min-height: 360px;
    }
}

/* ==============================================================
   5. Advantages（Screen 3）
   ============================================================== */

.fp-screen--advantages {
    position: relative;
    background-color: var(--color-bg-dark);
    overflow: hidden;
}

.advantages__bg {
    position: absolute;
    top: 0;
    right: 0;
    bottom: 0;
    left: 0;
    background-image: url("../../../../assets/website/images/advantages-img.png");
    background-size: cover;
    background-position: center;
    background-repeat: no-repeat;
    z-index: 0;
}

.advantages__overlay {
    position: absolute;
    top: 0;
    right: 0;
    bottom: 0;
    left: 0;
    background: linear-gradient(
            180deg,
            rgba(10, 23, 41, 0.35) 0%,
            rgba(10, 23, 41, 0.55) 100%
    );
    z-index: 1;
}

.fp-screen--advantages > .fp-screen__inner {
    position: relative;
    z-index: 2;
}

/* 第三屏标题渐变（左白 #FFFFFF → 右蓝 #0095FF），覆盖通用 .section-title */
.fp-screen--advantages .section-title,
.fp-screen--advantages .section-title span {
    background: linear-gradient(90deg, #ffffff 0%, #0095ff 100%);
    -webkit-background-clip: text;
    background-clip: text;
    -webkit-text-fill-color: transparent;
    color: transparent;
}

/* 第三屏内容垂直分布：标题/描述/按钮在上，统计区填满剩余高度（用于等高分割线） */
.fp-screen--advantages .fp-screen__inner {
    display: flex;
    flex-direction: column;
    justify-content: center;
    height: 100%;
}

.fp-screen--advantages .text-center {
    margin-top: var(--space-6);
    margin-bottom: var(--space-2);
}

.advantages-grid {
    display: grid;
    grid-template-columns: 1fr;
    gap: var(--space-6);
    align-self: stretch;
    flex: 1;
    margin-top: var(--space-8);
    min-height: 50vh;
}

@media (min-width: 768px) {
    .advantages-grid {
        grid-template-columns: repeat(3, 1fr);
        gap: 0;
    }
}

.stat-card {
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    text-align: center;
    padding: var(--space-6) var(--space-5);
    background-color: transparent;
    border: 0;
    border-radius: 0;
    position: relative;
    transition: transform var(--transition-base);
}

/* 移动端：分割线改为横向（border-top） */
@media (max-width: 767px) {
    .stat-card {
        border-top: 1px solid rgba(255, 255, 255, 0.18);
        padding-block: var(--space-8);
    }

    .stat-card:first-child {
        border-top: 0;
    }
}

/* 桌面端：四条全屏高的竖向分割线，分别位于最左、第二张卡片左、第三张卡片左、最右 */
/*.fp-screen--advantages::before,*/
/*.fp-screen--advantages::after,*/
.advantages__divider--edge {
    content: "";
    position: absolute;
    top: 0;
    bottom: 0;
    width: 1px;
    background-color: rgba(255, 255, 255, 0.18);
    z-index: 0;
    pointer-events: none;
}

/*.fp-screen--advantages::before {*/
/*  left: 33.3333%;*/
/*}*/

/*.fp-screen--advantages::after {*/
/*  left: 66.6666%;*/
/*}*/

.advantages__divider--left {
    left: 0;
}

.advantages__divider--right {
    left: 100%;
    transform: translateX(-1px); /* 1px 宽线对齐视口右缘 */
}

@media (max-width: 767px) {
    /* 移动端隐藏竖向分割线（用 border-top 代替） */
    .fp-screen--advantages::before,
    .fp-screen--advantages::after,
    .advantages__divider--edge {
        display: none;
    }
}

.stat-card:hover {
    transform: translateY(-4px);
}

.stat-card__icon {
    width: 56px;
    height: 56px;
    margin-bottom: var(--space-4);
    display: flex;
    align-items: center;
    justify-content: center;
}

.stat-card__icon img {
    width: 56px;
    height: 56px;
    display: block;
    object-fit: contain;
    object-position: center;
    /* 把图标统一渲染为蓝色（#0095FF） */
    filter: brightness(0) saturate(100%) invert(34%) sepia(95%) saturate(2476%) hue-rotate(190deg) brightness(101%) contrast(101%);
}

.stat-card__num {
    display: inline-block;
    font-size: var(--font-size-3xl);
    font-weight: var(--font-weight-bold);
    color: #ffffff;
    line-height: 1;
    margin-bottom: var(--space-3);
}

.stat-card__value {
    display: inline-block;
    line-height: 1;
}

.stat-card__suffix {
    display: inline-block;
    font-size: 0.45em;
    font-weight: var(--font-weight-semibold);
    color: #ffffff;
    line-height: 1;
    vertical-align: baseline;
    position: relative;
    top: -0.85em;
    margin-left: 0.1em;
}

@media (min-width: 1025px) {
    .stat-card__num {
        font-size: var(--font-size-4xl);
    }
}

.stat-card__title {
    font-size: var(--font-size-md);
    font-weight: var(--font-weight-semibold);
    color: #ffffff;
    margin: 0 0 var(--space-2) 0;
}

.stat-card__desc {
    color: var(--color-text-muted);
    font-size: var(--font-size-sm);
    line-height: var(--line-height-relaxed);
    max-width: 36ch;
    margin: 0;
}

/* ==============================================================
   6. Cases（Screen 4）
   ============================================================== */

.fp-screen--cases {
    background-color: var(--color-bg-dark);
}

/* 第四屏标题渐变（左白 #FFFFFF → 右蓝 #0095FF），覆盖通用 .section-title */
.fp-screen--cases .section-title,
.fp-screen--cases .section-title span {
    background: linear-gradient(90deg, #ffffff 0%, #0095ff 100%);
    -webkit-background-clip: text;
    background-clip: text;
    -webkit-text-fill-color: transparent;
    color: transparent;
}

.cases-grid {
    display: grid;
    grid-template-columns: 1fr;
    gap: var(--space-5);
    margin-top: var(--space-8);
}

@media (min-width: 768px) {
    .cases-grid {
        grid-template-columns: repeat(3, 1fr);
    }
}

/* 卡片：透明 + 四边描边 */
.case-card {
    position: relative;
    background-color: transparent;
    border: 1px solid rgba(255, 255, 255, 0.18);
    border-radius: var(--radius-md);
    overflow: hidden;
    transition: border-color var(--transition-base), transform var(--transition-base);
    display: flex;
    flex-direction: column;
    min-height: 280px;
}

.case-card:hover {
    border-color: var(--color-border-accent);
    transform: translateY(-6px);
}

/* 封面图：默认隐藏，hover 时整张卡片显示 */
.case-card__thumb {
    position: absolute;
    top: 0;
    right: 0;
    bottom: 0;
    left: 0;
    overflow: hidden;
    background-color: #1a2a40;
    opacity: 0;
    transition: opacity var(--transition-slow);
    z-index: 0;
}

.case-card__thumb img {
    width: 100%;
    height: 100%;
    object-fit: cover;
    transform: scale(1.05);
    transition: transform var(--transition-slow);
}

.case-card:hover .case-card__thumb {
    opacity: 1;
}

.case-card:hover .case-card__thumb img {
    transform: scale(1);
}

/* 封面图暗色蒙层：保证文字可读 */
.case-card__thumb::after {
    content: "";
    position: absolute;
    top: 0;
    right: 0;
    bottom: 0;
    left: 0;
    background: linear-gradient(
            180deg,
            rgba(10, 23, 41, 0.55) 0%,
            rgba(10, 23, 41, 0.85) 100%
    );
    pointer-events: none;
}

.case-card__body {
    position: relative;
    z-index: 1;
    padding: var(--space-5);
    flex: 1;
    display: flex;
    flex-direction: column;
    gap: var(--space-3);
}

/* 日期：上方月-日（大），下方年（小） */
.case-card__date {
    display: flex;
    flex-direction: column;
    align-items: flex-start;
    gap: 2px;
    margin-bottom: var(--space-1);
}

.case-card__date .day {
    font-size: var(--font-size-lg);
    color: var(--color-text-inverse);
    font-weight: var(--font-weight-bold);
    letter-spacing: var(--letter-spacing-wide);
    line-height: 1.1;
}

.case-card__date .year {
    font-size: var(--font-size-xs);
    color: var(--color-text-muted);
    letter-spacing: var(--letter-spacing-wide);
}

.case-card__title {
    font-size: var(--font-size-md);
    font-weight: var(--font-weight-semibold);
    color: #ffffff;
    margin: 0;
    line-height: var(--line-height-snug);
}

.case-card__desc {
    color: var(--color-text-muted);
    font-size: var(--font-size-sm);
    line-height: var(--line-height-relaxed);
    margin: 0;
}

.case-card__more {
    display: inline-flex;
    align-items: center;
    gap: var(--space-2);
    margin-top: auto;
    padding-top: var(--space-3);
    color: var(--color-text-inverse);
    font-size: var(--font-size-xs);
    font-weight: var(--font-weight-semibold);
    letter-spacing: var(--letter-spacing-wider);
    text-transform: uppercase;
    transition: color var(--transition-base);
}

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

.case-card__more .arrow {
    transition: transform var(--transition-base);
}

.case-card:hover .case-card__more .arrow {
    transform: translateX(4px);
}

/* ==============================================================
   7. Contact CTA + Footer（Screen 5）
   ============================================================== */

.fp-screen--contact {
    position: relative;
    background-color: var(--color-bg-dark);
    overflow: hidden;
    /* 整屏高度：CTA + 页脚 同时显示在一屏内 */
    height: 100vh;
    min-height: 600px;
}

.contact__bg {
    position: absolute;
    top: 0;
    right: 0;
    bottom: 0;
    left: 0;
    /* 拉伸铺满整个 contact 区域，消除上下空白 */
    background: url("../../../../assets/website/images/contact-img.png") center/100% 100% no-repeat;
    z-index: 0;
}

.contact__overlay {
    position: absolute;
    top: 0;
    right: 0;
    bottom: 0;
    left: 0;
    background: linear-gradient(
            180deg,
            rgba(10, 23, 41, 0.30) 0%,
            rgba(10, 23, 41, 0.55) 100%
    );
    z-index: 1;
}

.fp-screen--contact > .fp-screen__inner {
    position: relative;
    z-index: 2;
    height: 100%;
    /* 垂直分布：CTA 在中部，footer 紧贴底部 */
    display: flex;
    flex-direction: column;
    padding-block: var(--space-10) var(--space-3);
}

.contact-cta {
    flex: 1;
    display: flex;
    flex-direction: column;
    gap: var(--space-5);
    align-items: center;
    justify-content: center;
    text-align: center;
    padding-block: var(--space-4);
    /* 作为 contact__bg / contact__overlay 的定位上下文 */
    position: relative;
    overflow: hidden;
    border-radius: var(--radius-md);
}

@media (min-width: 768px) {
    .contact-cta {
        flex-direction: row;
        align-items: center;
        justify-content: center;
        gap: var(--space-8);
        padding-block: var(--space-6);
    }
}

.contact-cta__text {
    font-size: var(--font-size-md);
    font-weight: var(--font-weight-semibold);
    color: var(--color-text-inverse);
    margin: 0;
    max-width: 60ch;
    /* 在背景图之上 */
    position: relative;
    z-index: 2;
}

/* 按钮也需要浮在背景图之上 */
.contact-cta .btn {
    position: relative;
    z-index: 2;
}

@media (min-width: 1025px) {
    .contact-cta__text {
        font-size: var(--font-size-lg);
    }
}

.contact-cta__text strong {
    color: var(--color-accent);
    font-weight: var(--font-weight-bold);
}

/* 页脚：嵌入 contact 板块内，与 CTA 同一屏显示 */
.site-footer {
    /* 显式声明：非 fixed/sticky */
    position: static;
    background: transparent;
    /* 上 padding 保留内边距；下 padding 加大，约 2x 分割线距离 */
  padding-top: var(--space-6, 24px);
  padding-bottom: var(--space-16, 64px);
    margin-top: var(--space-6);
    border-top: 1px solid var(--color-border-dark);
    /* 不被压缩，固定在底部 */
    flex-shrink: 0;
}

.site-footer__grid {
    grid-template-columns: 1fr;
    gap: var(--space-6);
    max-width: var(--container-max);
    margin-inline: auto;
    /*padding-inline: var(--space-5);*/
    /* 上半部分距离分割线加大 */
    padding-bottom: var(--space-8);
}

@media (min-width: 768px) {
    .site-footer__grid {
        grid-template-columns: 1.5fr 1fr 1fr 1fr;
        gap: var(--space-6);
    }
}

.site-footer__bottom {
    flex-direction: column;
    align-items: flex-start;
    gap: var(--space-3);
    max-width: var(--container-max);
    margin-inline: auto;
    padding-inline: var(--space-5);
    /* 上半部分距分割线 = margin-top；下半部分距分割线 = padding-top */
    margin-top: var(--space-8);
    padding-top: var(--space-8);
}

@media (min-width: 768px) {
    .site-footer__bottom {
        flex-direction: row;
        align-items: center;
        justify-content: space-between;
        gap: var(--space-5);
    }
}

.site-footer__langs {
    display: flex;
    flex-wrap: wrap;
    gap: var(--space-3);
    padding: 0;
    margin: 0;
    list-style: none;
}

.site-footer__langs li a {
    color: var(--color-text-muted);
    font-size: var(--font-size-xs);
    transition: color var(--transition-base);
}

.site-footer__langs li a:hover,
.site-footer__langs li a.is-active {
    color: var(--color-accent);
}

/* ==============================================================
   8. 动画
   ============================================================== */

@keyframes fade-in-up {
    from {
        opacity: 0;
        transform: translateY(24px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

@keyframes fade-in {
    from {
        opacity: 0;
    }
    to {
        opacity: 1;
    }
}

/* 入视口触发动画 */
.anim-in-view {
    opacity: 0;
    transform: translateY(24px);
    transition: opacity 0.6s ease, transform 0.6s ease;
}

.anim-in-view.is-visible {
    opacity: 1;
    transform: translateY(0);
}

/* 卡片 stagger 延迟 */
.case-card.anim-in-view:nth-child(1) {
    transition-delay: 0s;
}

.case-card.anim-in-view:nth-child(2) {
    transition-delay: 0.1s;
}

.case-card.anim-in-view:nth-child(3) {
    transition-delay: 0.2s;
}

.stat-card.anim-in-view:nth-child(1) {
    transition-delay: 0s;
}

.stat-card.anim-in-view:nth-child(2) {
    transition-delay: 0.1s;
}

.stat-card.anim-in-view:nth-child(3) {
    transition-delay: 0.2s;
}

.accordion-item.anim-in-view:nth-child(1) {
    transition-delay: 0s;
}

.accordion-item.anim-in-view:nth-child(2) {
    transition-delay: 0.1s;
}

.accordion-item.anim-in-view:nth-child(3) {
    transition-delay: 0.2s;
}

.about-grid__media.anim-in-view {
    transition-delay: 0.2s;
}

/* ==============================================================
   9. 响应式：移动端调整
   ============================================================== */

@media (max-width: 767px) {
    /* 移动端平滑滚动 */
    html {
        scroll-behavior: smooth;
    }

    /* 关闭整页滚动机制，改为自然流式滚动 */
    .fullpage {
        height: auto;
        overflow: visible;
        scroll-snap-type: none;
    }

    /* 每屏不再强制 100vh，去掉 snap 对齐 */
    .fp-screen {
        min-height: auto;
        height: auto;
        scroll-snap-align: none;
        /* 缩小每屏上下 padding（原 48px → 16px） */
        padding-block: var(--space-4);
    }

    /* 屏内层 padding 也缩小（原 112px → 24px） */
    .fp-screen__inner {
        padding-block: var(--space-5);
    }

    /* Hero 轮播图：图片 1920:1000 等比例，文字叠加在图片上居中 */
    .fp-screen--hero {
        height: auto;
        min-height: 0;
        padding-block: 0;
    }

    .hero {
        width: 100%;
        height: auto;
        min-height: 0;
        /* 图片等比例 1920:1000 → 高度 = 宽度 × 52.08% */
        aspect-ratio: 1920 / 1000;
        display: flex;
        align-items: center;
        justify-content: center;
        overflow: hidden;
    }

    /* 图片重新作为 absolute 背景，铺满 hero（hero 已是等比例） */
    .hero__bg {
        position: absolute;
        top: 0;
        right: 0;
        bottom: 0;
        left: 0;
        background-size: 100% 100%;
        animation: none; /* 移动端关闭缩放动画 */
    }

    /* 文字居左叠加在图上（顶部留出 header 空间，避免与 logo 导航重叠） */
    .hero__inner {
        position: relative;
        z-index: 2;
        width: 100%;
        padding: var(--header-height-mobile) var(--space-4) var(--space-3);
        text-align: left;
    }

    .hero__content {
        align-items: flex-start;
        margin-inline: 0;
        max-width: 100%;
        gap: var(--space-2); /* 缩小元素间距 */
    }

    /* 移动端隐藏 Hero 标题和副标题 */
    .hero__title,
    .hero__lead {
        display: none;
    }

    /* 按钮缩小，避免在窄屏占满宽度 */
    .hero__content .btn {
        align-self: flex-start;
        justify-content: center;
        padding: var(--space-2) var(--space-4);
        font-size: 0.75rem; /* 12px */
        margin-top: 0;
    }

    /* contact 屏：恢复自然高度 */
    .fp-screen--contact {
        height: auto;
        min-height: auto;
    }

    /* 页脚：进一步缩小距离分割线的高度 + 距离联系板块的间隙 */
    .site-footer {
        padding-block: var(--space-1) var(--space-4); /* 顶部 4px 保持 */
        margin-top: 0; /* 原 4px → 0 */
    }

    .site-footer__grid {
        gap: var(--space-3); /* 原 16px → 12px */
        padding-bottom: var(--space-3); /* 原 16px → 12px */
    }

    .about-grid__media {
        order: -1;
    }

    .advantages-grid,
    .cases-grid {
        gap: var(--space-4);
    }

    .contact-cta {
        /* 移动端：左对齐 + 与其他板块统一的左右内边距（var(--container-padding) = 24px） */
        align-items: flex-start;
        text-align: left;
        padding-inline: var(--container-padding);
        padding-block: var(--space-4);
    }

    .contact-cta__text {
        max-width: 100%;
    }

    .contact-cta .btn {
        padding: var(--space-2) var(--space-4); /* 缩小按钮 */
        font-size: 0.75rem;
    }
}

@media (min-width: 768px) and (max-width: 1024px) {
    .fp-screen__inner {
        padding-block: var(--space-10);
    }

    .about-grid {
        gap: var(--space-8);
    }
}