* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

html {
    scroll-padding-top: 80px;
    scroll-behavior: smooth;
}
body {
    font-family: 'Inter', -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
    color: #2c3e2b;
    line-height: 1.6;
    background: #f5f7f2;
}
.font-display {
    font-family: 'Instrument Serif', serif;
}

:root {
    --forest-deep: #1a3a23;
    --forest-primary: #2d5a3a;
    --forest-mid: #4a7c59;
    --forest-moss: #6b8e23;
    --forest-light: #8ab896;
    --tech-cyan: #38b6ff;
    --tech-green: #4ade80;
    --wood-warm: #8a6a46;
    --bg-cream: #f5f7f2;
    --bg-light: #eef1ea;
    --bg-mid: #e0e7dc;
    --border-soft: #d4dcd0;
    --shadow-forest: 0 12px 32px -10px rgba(26, 58, 35, 0.15), 0 0 15px rgba(56, 182, 255, 0.08);
    --tech-glow: 0 0 12px rgba(74, 222, 128, 0.3), 0 0 20px rgba(56, 182, 255, 0.15);
}

@keyframes fadeRise {
    from {
        opacity: 0;
        transform: translateY(20px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}
.animate-fade-rise {
    animation: fadeRise 0.8s ease-out forwards;
}
.animate-fade-rise-delay {
    animation: fadeRise 0.8s ease-out 0.2s forwards;
    opacity: 0;
}
.animate-fade-rise-delay-2 {
    animation: fadeRise 0.8s ease-out 0.4s forwards;
    opacity: 0;
}

@keyframes fadeInUp {
    from {
        opacity: 0;
        transform: translateY(40px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

@keyframes fadeInLeft {
    from {
        opacity: 0;
        transform: translateX(-40px);
    }
    to {
        opacity: 1;
        transform: translateX(0);
    }
}

@keyframes fadeInScale {
    from {
        opacity: 0;
        transform: scale(0.85);
    }
    to {
        opacity: 1;
        transform: scale(1);
    }
}

@keyframes floatGlow {
    0%, 100% { transform: translateY(0); }
    50% { transform: translateY(-8px); }
}

@keyframes cursorBlink {
    0%, 100% { opacity: 1; }
    50% { opacity: 0; }
}

@keyframes gradientFlow {
    0%, 100% { background-position: 0% 50%; }
    50% { background-position: 100% 50%; }
}

@keyframes titleGlow {
    from {
        text-shadow: 0 0 10px rgba(74, 222, 128, 0.1);
    }
    to {
        text-shadow: 0 0 22px rgba(74, 222, 128, 0.3), 0 0 35px rgba(56, 182, 255, 0.3);
    }
}

@keyframes titlePop {
    0% { transform: scale(1); }
    50% { transform: scale(1.02); }
    100% { transform: scale(1); }
}

@keyframes fadeInDown {
    from {
        opacity: 0;
        transform: translateY(-20px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

/* 背景墙单图独立浮动 */
@keyframes imgFloat {
    from { transform: translateY(0); }
    to   { transform: translateY(var(--float-y, 8px)); }
}

/* 弹窗打开动画 */
@keyframes modalIn {
    from {
        opacity: 0;
        transform: scale(0.88) translateY(20px);
    }
    to {
        opacity: 1;
        transform: scale(1) translateY(0);
    }
}

/* 弹窗关闭动画 */
@keyframes modalOut {
    from {
        opacity: 1;
        transform: scale(1) translateY(0);
    }
    to {
        opacity: 0;
        transform: scale(0.92) translateY(10px);
    }
}

/* 轮播图片切换 — 下一张 */
@keyframes slideInRight {
    from { opacity: 0; transform: translateX(40px); }
    to   { opacity: 1; transform: translateX(0); }
}

/* 轮播图片切换 — 上一张 */
@keyframes slideInLeft {
    from { opacity: 0; transform: translateX(-40px); }
    to   { opacity: 1; transform: translateX(0); }
}

.animate-fade-up,
.animate-fade-left,
.animate-fade-scale {
    opacity: 0;
}

.animate-fade-up.is-visible {
    animation: fadeInUp 0.8s cubic-bezier(0.22, 1, 0.36, 1) forwards;
}

.animate-fade-left.is-visible {
    animation: fadeInLeft 0.8s cubic-bezier(0.22, 1, 0.36, 1) forwards;
}

.animate-fade-scale.is-visible {
    animation: fadeInScale 0.8s cubic-bezier(0.22, 1, 0.36, 1) forwards;
}

.delay-1 { animation-delay: 0.1s; }
.delay-2 { animation-delay: 0.2s; }
.delay-3 { animation-delay: 0.3s; }
.delay-4 { animation-delay: 0.4s; }
.delay-5 { animation-delay: 0.5s; }

@media (prefers-reduced-motion: reduce) {
    .animate-fade-up,
    .animate-fade-left,
    .animate-fade-scale,
    .animate-fade-rise,
    .animate-fade-rise-delay,
    .animate-fade-rise-delay-2 {
        opacity: 1;
        animation: none !important;
        transform: none !important;
    }
    .typing-cursor { display: none !important; }
    .hero-title .highlight { animation: none !important; }
    .typing-done { animation: none !important; }
    .marquee-track { animation: none !important; }
    .collapsible-wrapper > div,
    .collapsible-wrapper.open > div {
        transition: none !important;
    }
}

.container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 40px;
}

.hero-cinematic {
    position: relative;
    min-height: 100vh;
    width: 100%;
    overflow: hidden;
    background: var(--bg-cream);
}
.video-bg-wrap {
    position: absolute;
    z-index: 0;
    top: 300px;
    inset: auto 0 0 0;
    opacity: 0;
}
.video-bg {
    width: 100%;
    height: 100%;
    object-fit: cover;
}
.video-overlay-gradient {
    position: absolute;
    inset: 0;
    background: linear-gradient(to bottom, var(--bg-cream), transparent, var(--bg-cream));
}
.hero-top-layer {
    position: relative;
    z-index: 10;
}

.navbar {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    z-index: 1000;
    background: rgba(245, 247, 242, 0.96);
    backdrop-filter: blur(16px);
    -webkit-backdrop-filter: blur(16px);
    padding: 16px 0;
    border-bottom: 1px solid rgba(56, 182, 255, 0.15);
    box-shadow: 0 2px 8px rgba(0,0,0,0.02), 0 0 10px rgba(74, 222, 128, 0.05);
    animation: fadeInDown 0.8s cubic-bezier(0.22, 1, 0.36, 1);
}

.nav-container {
    display: flex;
    justify-content: space-between;
    align-items: center;
    flex-wrap: wrap;
    gap: 20px;
}
.logo h1 {
    font-size: 1.7rem;
    font-weight: 800;
    background: linear-gradient(90deg, var(--forest-primary), var(--tech-green));
    -webkit-background-clip: text;
            background-clip: text;
    color: transparent;
}
.logo span {
    font-size: 0.75rem;
    font-weight: 500;
    color: var(--forest-mid);
    display: block;
    margin-top: 2px;
}
.nav-links {
    display: flex;
    gap: 28px;
    list-style: none;
    flex-wrap: wrap;
}
.nav-links a {
    text-decoration: none;
    font-weight: 500;
    color: #34533c;
    transition: all 0.2s;
    font-size: 1rem;
    position: relative;
}
.nav-links a::after {
    content: '';
    position: absolute;
    bottom: -2px;
    left: 0;
    width: 0;
    height: 2px;
    background: linear-gradient(90deg, var(--tech-cyan), var(--tech-green));
    transition: width 0.3s;
}
.nav-links a:hover {
    color: var(--forest-moss);
}
.nav-links a:hover::after {
    width: 100%;
}
.btn-outline {
    border: 1.5px solid var(--forest-primary);
    background: transparent;
    padding: 6px 20px;
    border-radius: 40px;
    font-weight: 600;
    color: var(--forest-primary);
    transition: all 0.2s;
    cursor: pointer;
    font-size: 0.9rem;
    white-space: nowrap;
    text-decoration: none;
    position: relative;
    overflow: hidden;
}
.btn-outline::before {
    content: '';
    position: absolute;
    top: 0;
    left: -100%;
    width: 100%;
    height: 100%;
    background: linear-gradient(90deg, transparent, rgba(74, 222, 128, 0.1), transparent);
    transition: left 0.5s;
}
.btn-outline:hover {
    background: linear-gradient(90deg, var(--forest-primary), #3a6e48);
    color: white;
    box-shadow: var(--tech-glow);
    transform: scale(1.03);
}
.btn-outline:hover::before {
    left: 100%;
}

.hero-content-wrap {
    padding-top: 140px;
    padding-bottom: 160px;
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    text-align: center;
    width: 100%;
    padding-inline: 6px;
}
.hero-badge {
    background: rgba(224, 235, 224, 0.8);
    display: inline-block;
    padding: 8px 24px;
    border-radius: 40px;
    font-weight: 600;
    color: var(--forest-primary);
    font-size: 0.95rem;
    border: 1px solid rgba(74, 222, 128, 0.2);
}

.hero-title {
    font-size: 3.2rem;
    font-weight: normal;
    font-family: 'Instrument Serif', serif;
    margin: 24px 0 20px;
    color: var(--forest-deep);
    line-height: 1.2;
    letter-spacing: -1px;
    text-shadow: 0 0 10px rgba(74, 222, 128, 0.1);
    min-height: 1.2em;
}
.hero-title .highlight {
    background: linear-gradient(90deg, var(--tech-green), var(--tech-cyan), var(--tech-green));
    background-size: 200% 100%;
    -webkit-background-clip: text;
            background-clip: text;
    color: transparent;
    border-bottom: 3px solid var(--forest-light);
    display: inline-block;
    animation: gradientFlow 3s ease-in-out infinite;
}
.typing-cursor {
    display: inline-block;
    width: 3px;
    height: 0.9em;
    background-color: var(--forest-deep);
    margin-left: 6px;
    vertical-align: text-bottom;
    animation: cursorBlink 0.8s step-end infinite;
}
.typing-done .typing-cursor {
    display: none;
}
.typing-done {
    animation: titlePop 0.6s cubic-bezier(0.22, 1, 0.36, 1), titleGlow 2.5s ease-in-out infinite alternate;
}

.hero-content-wrap p {
    font-size: 1.2rem;
    max-width: 800px;
    margin: 0 auto;
    color: #465c4a;
}
.hero-quote {
    background: rgba(232, 240, 229, 0.85);
    display: inline-block;
    padding: 12px 32px;
    border-radius: 60px;
    margin-top: 36px;
    font-weight: 500;
    font-size: 1rem;
    color: var(--forest-primary);
    border: 1px solid rgba(56, 182, 255, 0.1);
}

section { padding: 80px 0; }
.section-light-bg {
    background: linear-gradient(180deg, var(--bg-light) 0%, var(--bg-cream) 100%);
}
.section-mid-bg {
    background: linear-gradient(180deg, var(--bg-mid) 0%, var(--bg-light) 100%);
}
.section-student-bg {
    background: linear-gradient(180deg, #e0e8db 0%, #e8efe3 100%);
}
.section-contact-bg {
    background: linear-gradient(180deg, #fbfcf9 0%, #f7f9f4 100%);
}
.section-dark-bg {
    background: linear-gradient(180deg, var(--forest-deep), #142f1b);
    color: #e8f0e4;
}

.section-title {
    text-align: center;
    font-size: 2.4rem;
    font-family: 'Instrument Serif', serif;
    font-weight: normal;
    margin-bottom: 20px;
    background: linear-gradient(90deg, var(--forest-deep), var(--forest-mid));
    -webkit-background-clip: text;
            background-clip: text;
    color: transparent;
}
.section-dark-bg .section-title {
    background: linear-gradient(90deg, #eef5e9, var(--tech-green));
    -webkit-background-clip: text;
            background-clip: text;
    color: transparent;
}
.section-sub {
    text-align: center;
    max-width: 800px;
    margin: 0 auto 56px auto;
    color: #556b55;
    font-size: 1.1rem;
}
.section-dark-bg .section-sub { color: #c8d8c5; }

.grid-4 {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(240px, 1fr));
    gap: 32px;
}
.feature-card {
    background: rgba(255, 255, 255, 0.85);
    backdrop-filter: blur(8px);
    -webkit-backdrop-filter: blur(8px);
    border-radius: 16px;
    padding: 36px 24px;
    text-align: center;
    box-shadow: var(--shadow-forest);
    border: 1px solid rgba(56, 182, 255, 0.1);
    transition: all 0.25s;
    position: relative;
    overflow: hidden;
}
.feature-card::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    width: 4px;
    height: 100%;
    background: linear-gradient(180deg, var(--tech-cyan), var(--tech-green));
}
.feature-card:hover {
    transform: translateY(-6px);
    box-shadow: var(--shadow-forest), var(--tech-glow);
    border-color: rgba(74, 222, 128, 0.2);
}
.feature-icon {
    font-size: 3rem;
    margin-bottom: 20px;
    background: linear-gradient(90deg, var(--forest-mid), var(--tech-green));
    -webkit-background-clip: text;
            background-clip: text;
    color: transparent;
}
.feature-card h3 {
    font-family: 'Instrument Serif', serif;
    font-size: 1.6rem;
    margin-bottom: 12px;
    color: var(--forest-deep);
}

.grid-4 .feature-card:nth-child(1).is-visible { animation-delay: 0.1s; }
.grid-4 .feature-card:nth-child(2).is-visible { animation-delay: 0.2s; }
.grid-4 .feature-card:nth-child(3).is-visible { animation-delay: 0.3s; }
.grid-4 .feature-card:nth-child(4).is-visible { animation-delay: 0.4s; }

/* 卡片可点击提示 */
.feature-card[data-industry] {
    cursor: pointer;
}
.feature-card[data-industry]:hover {
    border-color: rgba(74, 222, 128, 0.35);
}
.feature-card[data-industry]::after {
    content: '点击查看更多';
    position: absolute;
    bottom: 10px;
    right: 16px;
    font-size: 0.7rem;
    color: var(--forest-light);
    opacity: 0;
    transition: opacity 0.25s;
    pointer-events: none;
}
.feature-card[data-industry]:hover::after {
    opacity: 0.7;
}

/* ========== #about 动态图片背景墙 ========== */
.section-about-wall {
    position: relative;
    padding: 80px 0;
    overflow: hidden;
    background: #1a2d1a;
}

/* 背景墙容器 — 铺满 section */
.about-bg-wall {
    position: absolute;
    inset: 0;
    z-index: 0;
    overflow: hidden;
}

/* CSS Grid 5列 × 4行 图片网格 */
.bg-image-grid {
    display: grid;
    grid-template-columns: repeat(5, 1fr);
    grid-template-rows: repeat(4, 1fr);
    width: 110%;
    height: 110%;
    margin: -2% 0 0 -5%;
    gap: 2px;
    /* 3D 透视 */
    perspective: 1000px;
    transform-style: preserve-3d;
    transition: transform 0.8s cubic-bezier(0.22, 1, 0.36, 1);
}

.bg-image-grid .bg-img-wrap {
    overflow: hidden;
    position: relative;
    --float-y: 8px;
    --float-dur: 5s;
    --float-delay: 0s;
}

.bg-image-grid .bg-img-wrap img {
    width: 100%;
    height: 100%;
    object-fit: cover;
    display: block;
    transition: transform 0.5s cubic-bezier(0.22, 1, 0.36, 1),
                filter 0.5s ease;
    filter: brightness(0.9) saturate(1.15);
}

/* 交错淡入入场 */
.bg-image-grid.animated .bg-img-wrap {
    animation: fadeInUp 0.7s cubic-bezier(0.22, 1, 0.36, 1) forwards;
    opacity: 0;
}
/* 入场后启动独立浮动 */
.bg-image-grid.animated .bg-img-wrap img {
    animation: imgFloat var(--float-dur) ease-in-out var(--float-delay) infinite alternate;
}

/* 波浪高亮激活 */
.bg-image-grid .bg-img-wrap.wave-active img {
    transform: scale(1.1) !important;
    filter: brightness(1.5) saturate(1.6) !important;
    transition: all 0.5s cubic-bezier(0.22, 1, 0.36, 1);
}

/* 悬停聚光灯：当前图高亮 */
.bg-image-grid .bg-img-wrap:hover img {
    transform: scale(1.15);
    filter: brightness(1.35) saturate(1.5);
    z-index: 2;
}

/* 绿色渐变蒙层 — 保证前景卡片可读 */
.bg-wall-overlay {
    position: absolute;
    inset: 0;
    background:
        linear-gradient(180deg,
            rgba(18, 26, 16, 0.50) 0%,
            rgba(14, 20, 12, 0.20) 35%,
            rgba(14, 20, 12, 0.18) 65%,
            rgba(18, 26, 16, 0.45) 100%);
    pointer-events: none;
}

/* 前景内容层 */
.about-content-layer {
    position: relative;
    z-index: 2;
}

/* 深色模式下标题保持可见 */
.section-about-wall .section-title {
    background: linear-gradient(90deg, #e8f0e4, var(--tech-green));
    -webkit-background-clip: text;
            background-clip: text;
    color: transparent;
}
.section-about-wall .section-sub {
    color: #c0d0bc;
}

.stats-grid {
    display: flex;
    flex-wrap: wrap;
    justify-content: center;
    gap: 56px;
    text-align: center;
}
.stat-item { flex: 1; min-width: 160px; }
.stat-number {
    font-family: 'Instrument Serif', serif;
    font-size: 3rem;
    font-weight: normal;
    color: #b8d4a8;
    text-shadow: 0 0 15px rgba(184, 212, 168, 0.3);
}
.stat-label { font-size: 1rem; opacity: 0.9; margin-top: 6px; }
/* 统计数字悬停弹跳 */
.stat-item:hover .stat-number {
    transform: scale(1.08);
    transition: transform 0.3s cubic-bezier(0.34, 1.56, 0.64, 1);
}

.stats-grid .stat-item:nth-child(1).is-visible { animation-delay: 0.1s; }
.stats-grid .stat-item:nth-child(2).is-visible { animation-delay: 0.2s; }
.stats-grid .stat-item:nth-child(3).is-visible { animation-delay: 0.3s; }
.stats-grid .stat-item:nth-child(4).is-visible { animation-delay: 0.4s; }

.team-group {
    padding: 36px 32px;
    border-radius: 20px;
    margin-bottom: 40px;
    background: rgba(255, 255, 255, 0.55);
    backdrop-filter: blur(8px);
    -webkit-backdrop-filter: blur(8px);
    border: 1px solid rgba(56, 182, 255, 0.08);
    transition: all 0.3s ease;
}
.team-group:nth-child(even) {
    background: rgba(255, 255, 255, 0.3);
    border-color: rgba(74, 222, 128, 0.1);
}
.team-group:hover {
    transform: translateY(-4px);
    box-shadow: 0 20px 40px -15px rgba(26, 58, 35, 0.12);
}
.group-title {
    font-family: 'Instrument Serif', serif;
    font-size: 1.7rem;
    font-weight: normal;
    margin-bottom: 24px;
    padding: 8px 16px;
    border-left: 6px solid var(--tech-green);
    color: var(--forest-deep);
    background: linear-gradient(90deg, rgba(228, 237, 224, 0.8), transparent 100%);
    border-radius: 0 8px 8px 0;
    display: flex;
    align-items: center;
    gap: 10px;
    box-shadow: 0 2px 8px rgba(56, 182, 255, 0.05);
}

.team-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 32px;
    align-items: stretch;
}

.member-card {
    background: rgba(255, 255, 255, 0.9);
    backdrop-filter: blur(12px);
    -webkit-backdrop-filter: blur(12px);
    border-radius: 16px;
    overflow: hidden;
    box-shadow: var(--shadow-forest);
    border: 1px solid rgba(56, 182, 255, 0.1);
    display: flex;
    flex-direction: column;
    height: 100%;
    transition: all 0.3s ease;
    position: relative;
}
.member-card::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    height: 4px;
    background: linear-gradient(90deg, var(--tech-cyan), var(--tech-green));
    opacity: 0;
    transition: opacity 0.3s;
    z-index: 2;
}
.member-card:hover {
    transform: translateY(-6px);
    box-shadow: var(--shadow-forest), var(--tech-glow);
    border-color: rgba(74, 222, 128, 0.2);
}
.member-card:hover::before {
    opacity: 1;
}

.team-grid .member-card:nth-child(3n+1).is-visible { animation-delay: 0.1s; }
.team-grid .member-card:nth-child(3n+2).is-visible { animation-delay: 0.2s; }
.team-grid .member-card:nth-child(3n+3).is-visible { animation-delay: 0.3s; }

.member-img {
    width: 100%;
    height: 260px;
    background: linear-gradient(135deg, #e6ede1 0%, #d4dfd0 100%);
    display: flex;
    align-items: center;
    justify-content: center;
    overflow: hidden;
    flex-shrink: 0;
    position: relative;
}
.member-img img {
    width: 100%;
    height: 100%;
    object-fit: cover;
    object-position: center center;
    display: block;
    transition: transform 0.5s ease;
}
.member-card:hover .member-img img {
    transform: scale(1.05);
}
.img-fallback {
    font-size: 4.5rem;
    color: #7a9078;
    width: 100%;
    height: 100%;
    display: flex;
    align-items: center;
    justify-content: center;
    background: linear-gradient(135deg, #e6ede1 0%, #d4dfd0 100%);
}

.card-content {
    padding: 20px 20px 22px;
    flex: 1;
    display: flex;
    flex-direction: column;
    gap: 8px;
    min-height: 0;
}
.member-name {
    font-family: 'Instrument Serif', serif;
    font-size: 1.35rem;
    font-weight: normal;
    letter-spacing: -0.3px;
    line-height: 1.3;
    background: linear-gradient(90deg, var(--forest-deep), var(--forest-mid));
    -webkit-background-clip: text;
            background-clip: text;
    color: transparent;
    flex-shrink: 0;
}
.member-role {
    display: inline-block;
    width: fit-content;
    font-size: 0.78rem;
    color: var(--forest-primary);
    font-weight: 600;
    background: rgba(230, 239, 227, 0.8);
    padding: 4px 10px;
    border-radius: 20px;
    margin: 2px 0 6px;
    border: 1px solid rgba(74, 222, 128, 0.1);
    flex-shrink: 0;
}

.bio-container {
    position: relative;
    height: 52px;
    flex-shrink: 0;
    margin-bottom: 8px;
}

.short-bio {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    font-size: 0.85rem;
    color: #445745;
    line-height: 1.6;
    margin: 0;
    transition: opacity 0.25s ease;
    opacity: 1;
    pointer-events: auto;
}

.full-detail {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    opacity: 0;
    overflow-y: auto;
    font-size: 0.8rem;
    line-height: 1.65;
    color: #4f5e48;
    transition: opacity 0.25s ease;
    pointer-events: none;
    padding: 0;
    margin: 0;
    border: none;
}

.full-detail.show {
    opacity: 1;
    pointer-events: auto;
}

.bio-container.expanded .short-bio {
    opacity: 0;
    pointer-events: none;
}

.expand-btn {
    background: none;
    border: none;
    color: var(--forest-primary);
    font-weight: 600;
    cursor: pointer;
    font-size: 0.82rem;
    display: inline-flex;
    align-items: center;
    gap: 6px;
    padding: 8px 0;
    width: fit-content;
    transition: all 0.2s;
    border-bottom: 1px solid transparent;
    flex-shrink: 0;
    margin-top: 0;
}
.expand-btn:hover {
    color: var(--tech-green);
    border-color: var(--tech-green);
}
.expand-btn i {
    font-size: 0.7rem;
    transition: transform 0.3s;
}

.full-detail::-webkit-scrollbar {
    width: 4px;
}
.full-detail::-webkit-scrollbar-track {
    background: #eef1ea;
    border-radius: 4px;
}
.full-detail::-webkit-scrollbar-thumb {
    background: #8ab896;
    border-radius: 4px;
}
.full-detail::-webkit-scrollbar-thumb:hover {
    background: #4a7c59;
}

/* Firefox 滚动条样式 */
.full-detail {
    scrollbar-width: thin;
    scrollbar-color: #8ab896 #eef1ea;
}

.tag-list {
    display: flex;
    flex-wrap: wrap;
    gap: 6px;
    margin-top: 12px;
}
.tag {
    background: rgba(232, 239, 228, 0.8);
    color: #3d5a3f;
    padding: 3px 10px;
    border-radius: 30px;
    font-size: 0.7rem;
    font-weight: 500;
    border: 1px solid rgba(74, 222, 128, 0.1);
}

.contact-block {
    background: rgba(255, 255, 255, 0.9);
    backdrop-filter: blur(12px);
    -webkit-backdrop-filter: blur(12px);
    border-radius: 20px;
    padding: 48px 40px;
    text-align: center;
    box-shadow: var(--shadow-forest);
    border: 1px solid rgba(56, 182, 255, 0.1);
}
.contact-methods {
    display: flex;
    flex-wrap: wrap;
    justify-content: center;
    gap: 40px;
    margin: 36px 0 24px;
}
.contact-item {
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 8px;
    font-size: 1rem;
    transition: transform 0.3s cubic-bezier(0.34, 1.56, 0.64, 1);
}
.contact-item:hover {
    transform: translateY(-4px);
}
.contact-item:hover i {
    color: var(--tech-green);
    transition: color 0.3s ease;
}
.contact-item i {
    font-size: 2rem;
    background: linear-gradient(90deg, var(--forest-mid), var(--tech-green));
    -webkit-background-clip: text;
            background-clip: text;
    color: transparent;
}
.contact-item a {
    color: var(--forest-primary);
    text-decoration: none;
    font-weight: 500;
    border-bottom: 1px dashed rgba(56, 182, 255, 0.3);
    transition: all 0.2s;
}
.contact-item a:hover {
    color: var(--tech-green);
    border-color: var(--tech-green);
}

footer {
    background: linear-gradient(180deg, #122a19, #0e2415);
    color: #c8d8c5;
    padding: 48px 0 32px;
    text-align: center;
    border-top: 1px solid rgba(74, 222, 128, 0.1);
}
.footer-links a {
    color: #a8c4a0;
    text-decoration: none;
    margin: 0 15px;
    transition: color 0.2s;
    position: relative;
}
.footer-links a::after {
    content: '';
    position: absolute;
    bottom: -4px;
    left: 0;
    width: 0;
    height: 1px;
    background: var(--tech-green);
    transition: width 0.3s ease;
}
.footer-links a:hover {
    color: var(--tech-green);
}
.footer-links a:hover::after {
    width: 100%;
}

/* ========== Logo 图片 ========== */
.logo-img {
    height: 3rem;
    width: auto;
    vertical-align: middle;
    display: inline-block;
}

/* ========== 折叠按钮 ========== */
.collapse-toggle-wrap {
    text-align: center;
    margin-bottom: 24px;
}
.collapse-toggle-btn {
    display: inline-flex;
    align-items: center;
    gap: 8px;
    background: rgba(255, 255, 255, 0.75);
    backdrop-filter: blur(10px);
    -webkit-backdrop-filter: blur(10px);
    background-clip: border-box;
    border: 1.5px solid var(--forest-primary);
    color: var(--forest-primary);
    padding: 10px 28px;
    border-radius: 40px;
    font-weight: 600;
    font-size: 0.95rem;
    cursor: pointer;
    transition: all 0.3s cubic-bezier(0.22, 1, 0.36, 1);
    font-family: inherit;
    min-height: 44px; /* 触控友好 */
}
.collapse-toggle-btn:hover {
    background: linear-gradient(90deg, var(--forest-primary), #3a6e48);
    color: #fff;
    box-shadow: var(--tech-glow);
    transform: translateY(-2px);
}
.collapse-toggle-btn .fa-chevron-down {
    transition: transform 0.3s ease;
}
.collapse-toggle-btn.expanded .fa-chevron-down {
    transform: rotate(180deg);
}

/* ========== 折叠内容容器（grid-template-rows 丝滑动画） ========== */
.collapsible-wrapper {
    display: grid;
    grid-template-rows: 0fr;
    transition: grid-template-rows 0.6s cubic-bezier(0.22, 1, 0.36, 1);
    will-change: grid-template-rows;
}
.collapsible-wrapper > div {
    overflow: hidden;
    opacity: 0;
    transform: translateY(-8px);
    transition: opacity 0.35s ease 0.1s,
                transform 0.35s ease 0.1s;
}
.collapsible-wrapper.open {
    grid-template-rows: 1fr;
}
.collapsible-wrapper.open > div {
    opacity: 1;
    transform: translateY(0);
    transition: opacity 0.4s ease 0.2s,
                transform 0.4s ease 0.2s;
}

/* ========== 折叠预览容器（静态照片行） ========== */
.preview-container {
    overflow: hidden;
    width: 100%;
    margin-bottom: 28px;
    padding: 8px 0;
    -webkit-mask-image: linear-gradient(to right, transparent 0%, black 8%, black 92%, transparent 100%);
            mask-image: linear-gradient(to right, transparent 0%, black 8%, black 92%, transparent 100%);
}
.preview-container.hidden {
    display: none;
}
/* ========== 跑马灯滚动轨道 ========== */
.marquee-track {
    display: flex;
    gap: 24px;
    width: max-content;
    animation: marqueeScroll 28s linear infinite;
}
.preview-container:hover .marquee-track {
    animation-play-state: paused;
}
@keyframes marqueeScroll {
    0%   { transform: translateX(0); }
    100% { transform: translateX(-50%); }
}

/* ========== 预览缩略卡片 ========== */
.preview-card {
    flex-shrink: 0;
    width: 180px;
    height: 230px;
    border-radius: 16px;
    overflow: hidden;
    position: relative;
    box-shadow: 0 8px 28px rgba(26, 58, 35, 0.14);
    transition: transform 0.35s cubic-bezier(0.22, 1, 0.36, 1),
                box-shadow 0.35s cubic-bezier(0.22, 1, 0.36, 1);
    cursor: default;
    will-change: transform;
}
.preview-card:hover {
    transform: translateY(-6px);
    box-shadow: 0 14px 32px rgba(26, 58, 35, 0.22), var(--tech-glow);
}
.preview-card img {
    width: 100%;
    height: 100%;
    object-fit: cover;
    display: block;
}
.preview-card-overlay {
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    height: 55%;
    background: linear-gradient(
        to bottom,
        rgba(26, 58, 35, 0.85) 0%,
        rgba(26, 58, 35, 0.35) 60%,
        transparent 100%
    );
    pointer-events: none;
    border-radius: 16px 16px 0 0;
}
.preview-card-name {
    position: absolute;
    top: 12px;
    left: 12px;
    right: 10px;
    color: #fff;
    font-size: 0.9rem;
    font-weight: 600;
    letter-spacing: 0.6px;
    text-shadow: 0 2px 6px rgba(0, 0, 0, 0.55);
    white-space: nowrap;
    overflow: hidden;
    text-overflow: ellipsis;
    pointer-events: none;
}
.preview-card::after {
    content: '';
    position: absolute;
    bottom: 0;
    left: 0;
    right: 0;
    height: 40%;
    background: linear-gradient(to top, rgba(26, 58, 35, 0.25) 0%, transparent 100%);
    pointer-events: none;
    border-radius: 0 0 16px 16px;
}

/* ========== 分组标题行（含第二层折叠按钮） ========== */
.group-header {
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 16px;
    flex-wrap: wrap;
}
.group-toggle-btn {
    display: inline-flex;
    align-items: center;
    gap: 6px;
    background: rgba(255, 255, 255, 0.7);
    backdrop-filter: blur(8px);
    -webkit-backdrop-filter: blur(8px);
    background-clip: border-box;
    border: 1.5px solid var(--forest-light);
    color: var(--forest-mid);
    padding: 7px 18px;
    border-radius: 30px;
    font-weight: 600;
    font-size: 0.82rem;
    cursor: pointer;
    transition: all 0.3s cubic-bezier(0.22, 1, 0.36, 1);
    font-family: inherit;
    flex-shrink: 0;
    min-height: 40px; /* 触控友好 */
}
.group-toggle-btn:hover {
    background: linear-gradient(90deg, var(--forest-mid), var(--forest-moss));
    color: #fff;
    box-shadow: var(--tech-glow);
    transform: translateY(-2px);
}
.group-toggle-btn .fa-chevron-down {
    transition: transform 0.3s ease;
}
.group-toggle-btn.expanded .fa-chevron-down {
    transform: rotate(180deg);
}

/* ========== 公众号推文卡片 ========== */
/* 外层容器 */
#articlesScroll {
    display: flex;
    flex-direction: column;
    gap: 20px;
}
/* 横向滚动容器 */
.articles-scroll {
    display: flex;
    gap: 24px;
    overflow-x: auto;
    overflow-y: visible;
    padding: 8px 32px 20px;
    scroll-behavior: smooth;
    scrollbar-width: thin;
    scrollbar-color: var(--forest-light) transparent;
    -webkit-overflow-scrolling: touch;
}
.articles-scroll::-webkit-scrollbar { height: 6px; }
.articles-scroll::-webkit-scrollbar-track { background: transparent; border-radius: 3px; }
.articles-scroll::-webkit-scrollbar-thumb {
    background: var(--forest-light);
    border-radius: 3px;
}
.articles-scroll::-webkit-scrollbar-thumb:hover { background: var(--forest-mid); }
.article-card {
    flex-shrink: 0;
    user-select: none;
    width: 320px;
    background: rgba(255, 255, 255, 0.85);
    backdrop-filter: blur(8px);
    -webkit-backdrop-filter: blur(8px);
    border-radius: 16px;
    overflow: hidden;
    box-shadow: var(--shadow-forest);
    border: 1px solid rgba(56, 182, 255, 0.1);
    transition: all 0.35s cubic-bezier(0.22, 1, 0.36, 1);
    text-decoration: none;
    color: inherit;
    display: flex;
    flex-direction: column;
    cursor: pointer;
}
.article-card:hover {
    transform: translateY(-6px);
    box-shadow: var(--shadow-forest), var(--tech-glow);
    border-color: rgba(74, 222, 128, 0.2);
}
/* 深绿渐变 Banner（替代封面图） */
.article-card-banner {
    position: relative;
    width: 100%;
    min-height: 200px;
    padding: 32px 24px 28px;
    background: linear-gradient(135deg, var(--forest-deep) 0%, #2d5a3a 50%, #1a4a2a 100%);
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    gap: 14px;
    overflow: hidden;
    flex-shrink: 0;
}
/* 装饰圆圈 */
.article-card-banner::before {
    content: '';
    position: absolute;
    top: -36px; right: -36px;
    width: 110px; height: 110px;
    background: rgba(74, 222, 128, 0.08);
    border-radius: 50%;
    pointer-events: none;
}
.article-card-banner::after {
    content: '';
    position: absolute;
    bottom: -28px; left: -28px;
    width: 80px; height: 80px;
    background: rgba(56, 182, 255, 0.06);
    border-radius: 50%;
    pointer-events: none;
}
.article-card-banner-icon {
    font-size: 1.8rem;
    color: rgba(255, 255, 255, 0.65);
    position: relative;
    z-index: 1;
}
.article-card-banner-title {
    font-family: 'Instrument Serif', serif;
    font-size: 1.15rem;
    color: #fff;
    text-align: center;
    line-height: 1.35;
    position: relative;
    z-index: 1;
    display: -webkit-box;
    -webkit-line-clamp: 3;
    -webkit-box-orient: vertical;
    overflow: hidden;
}
.article-card-banner-line {
    width: 40px;
    height: 2px;
    background: var(--tech-green);
    opacity: 0.45;
    border-radius: 1px;
    position: relative;
    z-index: 1;
}
.article-card:hover .article-card-banner {
    background: linear-gradient(135deg, #1e4a2a 0%, #356a42 50%, #1e5230 100%);
}
.article-card-body {
    padding: 18px 22px 24px;
    flex: 1;
    display: flex;
    flex-direction: column;
}
.article-card-title {
    font-family: 'Instrument Serif', serif;
    font-size: 1.2rem;
    font-weight: normal;
    color: var(--forest-deep);
    margin-bottom: 12px;
    line-height: 1.4;
    display: -webkit-box;
    -webkit-line-clamp: 2;
    -webkit-box-orient: vertical;
    overflow: hidden;
    letter-spacing: -0.2px;
}
.article-card-meta {
    display: flex;
    gap: 18px;
    flex-wrap: wrap;
    font-size: 0.8rem;
    color: #7a9078;
    margin-top: auto;
}
.article-card-meta span {
    display: inline-flex;
    align-items: center;
    gap: 4px;
}
.article-card-meta i {
    color: var(--forest-light);
    font-size: 0.75rem;
}

/* ========== 产业弹窗 Modal ========== */
.industry-modal-overlay {
    position: fixed;
    inset: 0;
    z-index: 9999;
    background: rgba(15, 25, 15, 0.75);
    backdrop-filter: blur(6px);
    -webkit-backdrop-filter: blur(6px);
    display: flex;
    align-items: center;
    justify-content: center;
    padding: 40px 20px;
    animation: fadeIn 0.25s ease-out;
}
@keyframes fadeIn {
    from { opacity: 0; }
    to   { opacity: 1; }
}
.industry-modal-overlay.closing {
    animation: fadeOut 0.2s ease-in forwards;
}
@keyframes fadeOut {
    from { opacity: 1; }
    to   { opacity: 0; }
}

/* 弹窗主体 */
.industry-modal {
    background: #fff;
    border-radius: 20px;
    max-width: 900px;
    width: 100%;
    height: 520px;
    max-height: 85vh;
    display: flex;
    overflow: hidden;
    box-shadow: 0 24px 64px rgba(0,0,0,0.35), var(--tech-glow);
    animation: modalIn 0.35s cubic-bezier(0.22, 1, 0.36, 1);
    position: relative;
}
.industry-modal-overlay.closing .industry-modal {
    animation: modalOut 0.2s cubic-bezier(0.22, 1, 0.36, 1) forwards;
}

/* 关闭按钮 */
.modal-close {
    position: absolute;
    top: 16px;
    right: 16px;
    z-index: 10;
    background: rgba(255,255,255,0.9);
    border: none;
    width: 40px;
    height: 40px;
    border-radius: 50%;
    font-size: 1.3rem;
    color: var(--forest-deep);
    cursor: pointer;
    display: flex;
    align-items: center;
    justify-content: center;
    transition: all 0.25s;
    box-shadow: 0 2px 12px rgba(0,0,0,0.12);
    backdrop-filter: blur(8px);
}
.modal-close:hover {
    background: #e74c3c;
    color: #fff;
    transform: rotate(90deg);
    box-shadow: 0 4px 16px rgba(231,76,60,0.35);
}

/* ===== 弹窗左侧 — 图片轮播 ===== */
.modal-left {
    flex: 1 1 55%;
    min-width: 0;
    background: #1a2a1a;
    position: relative;
    display: flex;
    align-items: center;
    justify-content: center;
    overflow: hidden;
}

.carousel-main {
    width: 100%;
    height: 100%;
    position: relative;
    display: flex;
    align-items: center;
    justify-content: center;
}

.carousel-main img {
    width: 100%;
    height: 100%;
    object-fit: cover;
    display: block;
    transition: opacity 0.35s ease;
}
.carousel-main img.slide-left {
    animation: slideInLeft 0.35s ease-out;
}
.carousel-main img.slide-right {
    animation: slideInRight 0.35s ease-out;
}

/* 轮播箭头 */
.carousel-prev,
.carousel-next {
    position: absolute;
    top: 50%;
    transform: translateY(-50%);
    z-index: 5;
    background: rgba(255,255,255,0.15);
    backdrop-filter: blur(6px);
    -webkit-backdrop-filter: blur(6px);
    border: 1px solid rgba(255,255,255,0.25);
    color: #fff;
    width: 42px;
    height: 42px;
    border-radius: 50%;
    font-size: 1.5rem;
    cursor: pointer;
    display: flex;
    align-items: center;
    justify-content: center;
    transition: all 0.25s;
    line-height: 1;
}
.carousel-prev:hover,
.carousel-next:hover {
    background: rgba(255,255,255,0.3);
    border-color: rgba(255,255,255,0.5);
    box-shadow: 0 0 20px rgba(74, 222, 128, 0.3);
}
.carousel-prev { left: 12px; }
.carousel-next { right: 12px; }

/* 轮播底部指示器 */
.carousel-indicators {
    position: absolute;
    bottom: 16px;
    left: 50%;
    transform: translateX(-50%);
    z-index: 5;
    display: flex;
    gap: 8px;
    align-items: center;
    background: rgba(0,0,0,0.4);
    backdrop-filter: blur(6px);
    -webkit-backdrop-filter: blur(6px);
    padding: 8px 16px;
    border-radius: 30px;
}

.carousel-dot {
    width: 10px;
    height: 10px;
    border-radius: 50%;
    background: rgba(255,255,255,0.45);
    border: none;
    cursor: pointer;
    transition: all 0.3s;
    padding: 0;
}
.carousel-dot.active {
    background: var(--tech-green);
    box-shadow: 0 0 10px rgba(74, 222, 128, 0.5);
    width: 12px;
    height: 12px;
}
.carousel-dot:hover {
    background: rgba(255,255,255,0.75);
}

.carousel-counter {
    color: rgba(255,255,255,0.8);
    font-size: 0.8rem;
    font-weight: 500;
    margin-left: 4px;
    min-width: 36px;
    text-align: center;
}

/* ===== 弹窗右侧 — 文字介绍 ===== */
.modal-right {
    flex: 1 1 45%;
    min-width: 280px;
    padding: 48px 36px 40px;
    display: flex;
    flex-direction: column;
    justify-content: center;
    overflow-y: auto;
}

.modal-right .modal-icon {
    font-size: 2.6rem;
    margin-bottom: 16px;
    background: linear-gradient(135deg, var(--forest-mid), var(--tech-green));
    -webkit-background-clip: text;
            background-clip: text;
    color: transparent;
}

.modal-right h2 {
    font-family: 'Instrument Serif', serif;
    font-size: 2rem;
    font-weight: normal;
    color: var(--forest-deep);
    margin-bottom: 16px;
    letter-spacing: -0.5px;
}

.modal-right .modal-desc {
    font-size: 1rem;
    line-height: 1.85;
    color: #445745;
    margin-bottom: 24px;
}

.modal-right .modal-tags {
    display: flex;
    flex-wrap: wrap;
    gap: 8px;
}

.modal-right .modal-tags .tag {
    background: rgba(232, 239, 228, 0.9);
    color: #3d5a3f;
    padding: 5px 14px;
    border-radius: 30px;
    font-size: 0.78rem;
    font-weight: 500;
    border: 1px solid rgba(74, 222, 128, 0.15);
}

/* ===== 弹窗响应式 ===== */
@media (max-width: 768px) {
    .industry-modal {
        flex-direction: column;
        height: auto;
        min-height: 450px;
        max-height: 90vh;
        border-radius: 16px;
    }
    .modal-left {
        flex: 0 0 260px;
        min-height: 260px;
    }
    .modal-right {
        flex: 1;
        padding: 28px 24px 32px;
    }
    .modal-right h2 {
        font-size: 1.5rem;
    }
    .modal-right .modal-desc {
        font-size: 0.9rem;
        line-height: 1.7;
    }
    .carousel-prev,
    .carousel-next {
        width: 34px;
        height: 34px;
        font-size: 1.2rem;
    }
    .carousel-prev { left: 8px; }
    .carousel-next { right: 8px; }
    .modal-close {
        top: 8px;
        right: 8px;
        width: 34px;
        height: 34px;
        font-size: 1.1rem;
    }
}

@media (max-width: 480px) {
    .industry-modal-overlay {
        padding: 16px 8px;
    }
    .modal-left {
        flex: 0 0 220px;
        min-height: 220px;
    }
    .modal-right {
        padding: 20px 18px 24px;
        max-height: 45vh;
        overflow-y: auto;
    }
    .carousel-indicators {
        bottom: 8px;
        padding: 5px 12px;
        gap: 5px;
    }
    .carousel-dot {
        width: 8px;
        height: 8px;
    }
    .carousel-dot.active {
        width: 10px;
        height: 10px;
    }
}

/* 联系方式项交错入场 */
.contact-item:nth-child(1).is-visible { animation-delay: 0.1s; }
.contact-item:nth-child(2).is-visible { animation-delay: 0.2s; }
.contact-item:nth-child(3).is-visible { animation-delay: 0.3s; }
.contact-item:nth-child(4).is-visible { animation-delay: 0.4s; }

/* 推文卡片入场动画延迟 */
.articles-scroll .article-card:nth-child(1).is-visible { animation-delay: 0.1s; }
.articles-scroll .article-card:nth-child(2).is-visible { animation-delay: 0.2s; }
.articles-scroll .article-card:nth-child(3).is-visible { animation-delay: 0.3s; }
.articles-scroll .article-card:nth-child(4).is-visible { animation-delay: 0.4s; }
.articles-scroll .article-card:nth-child(5).is-visible { animation-delay: 0.5s; }
.articles-scroll .article-card:nth-child(6).is-visible { animation-delay: 0.6s; }

@media (max-width: 992px) {
    .team-grid { grid-template-columns: repeat(2, 1fr); }
    /* 平板端预览卡片 */
    .preview-card { width: 150px; height: 195px; border-radius: 14px; }
    .preview-card-name { font-size: 0.82rem; }
    .marquee-track { gap: 18px; }
    /* 平板端折叠按钮 */
    .collapse-toggle-btn { padding: 10px 24px; font-size: 0.9rem; }
    /* 平板端推文卡片 */
    .articles-scroll { gap: 20px; padding: 8px 24px 16px; scrollbar-width: none; }
    .articles-scroll::-webkit-scrollbar { display: none; }
    .article-card { width: 280px; }
    .article-card-body { padding: 16px 18px 20px; }
    .article-card-title { font-size: 1.1rem; }
    .article-card-banner { min-height: 180px; padding: 28px 20px 24px; }
    .article-card-banner-title { font-size: 1.05rem; }
    /* 平板端背景墙 4 列 */
    .bg-image-grid { grid-template-columns: repeat(4, 1fr); grid-template-rows: repeat(5, 1fr); }
    /* 平板端导航 */
    .logo h1 { font-size: 1.5rem; }
    .logo-img { height: 2.5rem; }
    .nav-links { gap: 20px; }
    .nav-links a { font-size: 0.9rem; }
    .btn-outline { font-size: 0.85rem; padding: 5px 16px; }
}
@media (max-width: 768px) {
    section { padding: 48px 0; }
    .container { padding: 0 20px; }
    /* 手机端背景墙 3 列 */
    .section-about-wall { overflow: visible; }
    .bg-image-grid { grid-template-columns: repeat(3, 1fr); grid-template-rows: auto; }
    .bg-image-grid .bg-img-wrap { aspect-ratio: 1 / 1; }
    .navbar { padding: 10px 0; }
    .nav-container { flex-direction: column; align-items: center; gap: 10px; }
    .logo h1 { font-size: 1.3rem; }
    .logo span { font-size: 0.65rem; }
    .nav-links { gap: 10px; justify-content: center; }
    .nav-links a { font-size: 0.7rem; }
    .btn-outline { font-size: 0.8rem; padding: 5px 14px; }
    .hero-cinematic { display: flex; align-items: center; justify-content: center; background: linear-gradient(180deg, #e8efe3 0%, #d4dfd0 40%, #c8d8c0 100%); }
    .hero-top-layer { width: 100%; display: flex; flex-direction: column; align-items: center; }
    .hero-content-wrap { padding: 80px 12px 40px; }
    .hero-title { font-size: 1.8rem; margin: 16px 0 14px; letter-spacing: -0.5px; }
    .hero-content-wrap p { font-size: 0.85rem; }
    .hero-badge { font-size: 0.75rem; padding: 6px 14px; }
    .hero-quote { font-size: 0.8rem; padding: 8px 16px; margin-top: 20px; max-width: 88vw; }
    .video-bg-wrap { display: none; }
    .section-title { font-size: 1.8rem; }
    .group-title { font-size: 1.3rem; }
    .team-group { padding: 24px 20px; margin-bottom: 32px; }
    .team-grid { grid-template-columns: 1fr; gap: 24px; }
    .stats-grid { display: grid; grid-template-columns: repeat(2, 1fr); gap: 24px 16px; }
    .stat-number { font-size: 2rem; }
    .stat-label { font-size: 0.85rem; }
    .contact-methods { display: grid; grid-template-columns: repeat(2, 1fr); gap: 20px 12px; }
    .contact-block { padding: 28px 18px; border-radius: 16px; }
    .contact-item i { font-size: 1.5rem; }
    .contact-item { font-size: 0.85rem; gap: 4px; }
    .contact-item span, .contact-item a { font-size: 0.78rem; }
    .member-img { height: 240px; }
    .bio-container { height: 60px; }
    /* 手机端 Logo */
    .logo-img { height: 2rem; }
    /* 手机端折叠按钮 */
    .collapse-toggle-wrap { margin-bottom: 20px; }
    .collapse-toggle-btn { padding: 10px 20px; font-size: 0.85rem; }
    /* 手机端预览卡片 */
    .preview-card { width: 120px; height: 160px; border-radius: 12px; }
    .preview-card-name { font-size: 0.75rem; top: 8px; left: 8px; }
    .preview-card-overlay { border-radius: 12px 12px 0 0; }
    .preview-card::after { border-radius: 0 0 12px 12px; }
    .marquee-track { gap: 14px; }
    /* 手机端分组标题行 */
    .group-header { flex-direction: column; align-items: flex-start; gap: 10px; }
    .group-toggle-btn { width: 100%; justify-content: center; font-size: 0.78rem; padding: 8px 16px; }
    /* 手机端推文卡片 */
    .articles-scroll { gap: 16px; padding: 8px 24px 18px; scrollbar-width: none; }
    .articles-scroll::-webkit-scrollbar { display: none; }
    .article-card { width: 280px; border-radius: 14px; }
    .article-card:hover { transform: none; }
    .article-card-body { padding: 14px 16px 16px; }
    .article-card-title { font-size: 1rem; }
    .article-card-meta { gap: 10px; font-size: 0.72rem; }
    .article-card-banner { min-height: 140px; padding: 22px 18px 20px; gap: 10px; }
    .article-card-banner-icon { font-size: 1.35rem; }
    .article-card-banner-title { font-size: 0.9rem; }
    .article-card-banner::before { width: 75px; height: 75px; top: -24px; right: -24px; }
    .article-card-banner::after { width: 55px; height: 55px; bottom: -18px; left: -18px; }
    /* 手机端鸽米蔗茶 — 横向滚动 */
    .grid-4 { display: flex; flex-wrap: nowrap; overflow-x: auto; gap: 16px; padding: 4px 4px 16px; scrollbar-width: none; -webkit-overflow-scrolling: touch; min-width: 0; width: 100%; }
    .grid-4::-webkit-scrollbar { display: none; }
    .feature-card { flex-shrink: 0; width: 240px; padding: 28px 20px; border-radius: 14px; }
    .feature-card:hover { transform: none; }
    .feature-card[data-industry]::after { display: none; }
    .feature-icon { font-size: 2.2rem; margin-bottom: 14px; }
    .feature-card h3 { font-size: 1.3rem; margin-bottom: 8px; }
    .feature-card p { font-size: 0.85rem; }
}

/* ========== 返回顶部悬浮按钮 ========== */
.back-to-top {
    position: fixed;
    bottom: 32px;
    right: 32px;
    z-index: 999;
    width: 48px;
    height: 48px;
    border-radius: 50%;
    background: linear-gradient(135deg, var(--forest-primary), var(--forest-mid));
    color: #fff;
    border: none;
    cursor: pointer;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 1.2rem;
    box-shadow: 0 4px 16px rgba(26, 58, 35, 0.3), var(--tech-glow);
    opacity: 0;
    visibility: hidden;
    transform: translateY(20px);
    transition: all 0.35s cubic-bezier(0.22, 1, 0.36, 1);
}
.back-to-top.visible {
    opacity: 1;
    visibility: visible;
    transform: translateY(0);
}
.back-to-top:hover {
    transform: translateY(-5px);
    box-shadow: 0 10px 28px rgba(26, 58, 35, 0.45), var(--tech-glow);
    background: linear-gradient(135deg, var(--forest-mid), var(--tech-green));
}
.back-to-top:active {
    transform: translateY(-2px);
}
/* 手机端适配 */
@media (max-width: 768px) {
    .back-to-top {
        bottom: 20px;
        right: 20px;
        width: 42px;
        height: 42px;
        font-size: 1rem;
    }
}