/* ===== 全局重置与基础 ===== */
* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}
html {
    scroll-behavior: smooth;
}
body {
    font-family: 'Segoe UI', 'PingFang SC', 'Microsoft YaHei', sans-serif;
    background: #f4f6fc;
    color: #1a1a2e;
    line-height: 1.6;
    transition: background 0.4s, color 0.4s;
}
body.dark {
    background: #0f0f1a;
    color: #e0e0f0;
}
a {
    color: inherit;
    text-decoration: none;
}
ul {
    list-style: none;
}
img {
    max-width: 100%;
    height: auto;
    display: block;
}
.container {
    max-width: 1280px;
    margin: 0 auto;
    padding: 0 24px;
}
.btn {
    display: inline-block;
    padding: 14px 36px;
    border-radius: 60px;
    font-weight: 700;
    font-size: 1rem;
    border: none;
    cursor: pointer;
    transition: all 0.3s;
    background: linear-gradient(135deg, #f0c040, #e6a800);
    color: #1a1a2e;
    box-shadow: 0 8px 24px rgba(240, 192, 64, 0.35);
}
.btn:hover {
    transform: translateY(-3px);
    box-shadow: 0 12px 32px rgba(240, 192, 64, 0.5);
}
.btn-outline {
    background: transparent;
    border: 2px solid #f0c040;
    color: #f0c040;
    box-shadow: none;
}
.btn-outline:hover {
    background: #f0c040;
    color: #1a1a2e;
}
.section {
    padding: 80px 0;
}
.section-title {
    text-align: center;
    margin-bottom: 60px;
}
.section-title h2 {
    font-size: 2.5rem;
    font-weight: 800;
    margin-bottom: 12px;
    background: linear-gradient(135deg, #f0c040, #e6a800);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}
.section-title p {
    font-size: 1.1rem;
    color: #666;
    max-width: 600px;
    margin: 0 auto;
}
.dark .section-title p {
    color: #aaa;
}
.card {
    background: #fff;
    border-radius: 20px;
    padding: 32px;
    box-shadow: 0 10px 40px rgba(0, 0, 0, 0.06);
    transition: all 0.4s;
    backdrop-filter: blur(4px);
}
.dark .card {
    background: rgba(30, 30, 50, 0.7);
    box-shadow: 0 10px 40px rgba(0, 0, 0, 0.3);
}
.card:hover {
    transform: translateY(-8px);
    box-shadow: 0 20px 60px rgba(0, 0, 0, 0.1);
}
.grid-2 {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 40px;
}
.grid-3 {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 32px;
}
.grid-4 {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: 24px;
}
.text-center {
    text-align: center;
}
.mt-20 {
    margin-top: 20px;
}
.mb-20 {
    margin-bottom: 20px;
}
.badge {
    display: inline-block;
    padding: 6px 16px;
    border-radius: 40px;
    font-size: 0.85rem;
    font-weight: 600;
    background: rgba(240, 192, 64, 0.15);
    color: #e6a800;
    margin-bottom: 12px;
}
.dark .badge {
    background: rgba(240, 192, 64, 0.2);
    color: #f0c040;
}

/* ===== Header ===== */
header {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    z-index: 1000;
    background: rgba(255, 255, 255, 0.85);
    backdrop-filter: blur(16px);
    border-bottom: 1px solid rgba(0, 0, 0, 0.04);
    transition: all 0.4s;
}
.dark header {
    background: rgba(15, 15, 26, 0.85);
    border-bottom: 1px solid rgba(255, 255, 255, 0.05);
}
.header-inner {
    display: flex;
    align-items: center;
    justify-content: space-between;
    height: 72px;
}
.logo {
    display: flex;
    align-items: center;
    gap: 12px;
    font-size: 1.6rem;
    font-weight: 900;
    color: #1a1a2e;
}
.dark .logo {
    color: #f0f0f0;
}
.logo svg {
    width: 40px;
    height: 40px;
}
.nav-list {
    display: flex;
    gap: 32px;
    font-weight: 600;
}
.nav-list a {
    font-size: 0.95rem;
    position: relative;
    padding: 4px 0;
    transition: color 0.3s;
}
.nav-list a::after {
    content: '';
    position: absolute;
    bottom: -2px;
    left: 0;
    width: 0;
    height: 2px;
    background: #f0c040;
    transition: width 0.3s;
}
.nav-list a:hover,
.nav-list a.active {
    color: #f0c040;
}
.nav-list a:hover::after,
.nav-list a.active::after {
    width: 100%;
}
.header-actions {
    display: flex;
    align-items: center;
    gap: 16px;
}
.theme-toggle {
    background: rgba(0, 0, 0, 0.05);
    border: none;
    border-radius: 50%;
    width: 42px;
    height: 42px;
    cursor: pointer;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 1.3rem;
    transition: all 0.3s;
}
.dark .theme-toggle {
    background: rgba(255, 255, 255, 0.08);
}
.theme-toggle:hover {
    background: rgba(240, 192, 64, 0.2);
}
.mobile-menu-btn {
    display: none;
    background: none;
    border: none;
    font-size: 1.8rem;
    cursor: pointer;
    color: #1a1a2e;
    padding: 4px;
}
.dark .mobile-menu-btn {
    color: #f0f0f0;
}

/* ===== Hero ===== */
.hero {
    min-height: 100vh;
    display: flex;
    align-items: center;
    padding-top: 72px;
    position: relative;
    overflow: hidden;
    background: linear-gradient(160deg, #1a1a2e 0%, #16213e 50%, #0f3460 100%);
}
.hero::before {
    content: '';
    position: absolute;
    top: -30%;
    right: -20%;
    width: 70%;
    height: 120%;
    background: radial-gradient(circle, rgba(240, 192, 64, 0.08) 0%, transparent 70%);
    pointer-events: none;
}
.hero .container {
    position: relative;
    z-index: 2;
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 60px;
    align-items: center;
}
.hero-content h1 {
    font-size: 3.8rem;
    font-weight: 900;
    line-height: 1.2;
    color: #fff;
    margin-bottom: 20px;
}
.hero-content h1 span {
    background: linear-gradient(135deg, #f0c040, #e6a800);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}
.hero-content p {
    font-size: 1.2rem;
    color: rgba(255, 255, 255, 0.7);
    max-width: 540px;
    margin-bottom: 36px;
}
.hero-btns {
    display: flex;
    gap: 16px;
    flex-wrap: wrap;
}
.hero-visual {
    display: flex;
    justify-content: center;
    align-items: center;
    position: relative;
}
.hero-card {
    background: rgba(255, 255, 255, 0.06);
    backdrop-filter: blur(20px);
    border-radius: 32px;
    padding: 40px;
    border: 1px solid rgba(255, 255, 255, 0.1);
    text-align: center;
    max-width: 400px;
    width: 100%;
}
.hero-card .big-number {
    font-size: 5rem;
    font-weight: 900;
    background: linear-gradient(135deg, #f0c040, #e6a800);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
    line-height: 1;
}
.hero-card p {
    color: rgba(255, 255, 255, 0.6);
    margin-top: 8px;
}
.hero-card .btn {
    margin-top: 24px;
    width: 100%;
}
.hero-slider-dots {
    display: flex;
    justify-content: center;
    gap: 10px;
    margin-top: 30px;
}
.dot {
    width: 12px;
    height: 12px;
    border-radius: 50%;
    background: rgba(255, 255, 255, 0.2);
    cursor: pointer;
    transition: all 0.3s;
}
.dot.active {
    background: #f0c040;
    width: 36px;
    border-radius: 6px;
}

/* ===== About ===== */
.about {
    background: #fff;
}
.dark .about {
    background: rgba(20, 20, 35, 0.9);
}
.about-grid {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 60px;
    align-items: center;
}
.about-text h2 {
    font-size: 2.2rem;
    font-weight: 800;
    margin-bottom: 20px;
}
.about-text p {
    color: #555;
    margin-bottom: 16px;
    font-size: 1.05rem;
}
.dark .about-text p {
    color: #bbb;
}
.about-stats {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 20px;
    margin-top: 32px;
}
.stat-item {
    text-align: center;
    padding: 16px;
    background: #f4f6fc;
    border-radius: 16px;
    transition: all 0.4s;
}
.dark .stat-item {
    background: rgba(255, 255, 255, 0.04);
}
.stat-item .num {
    font-size: 2.4rem;
    font-weight: 900;
    color: #f0c040;
}
.stat-item .label {
    font-size: 0.9rem;
    color: #666;
    margin-top: 4px;
}
.dark .stat-item .label {
    color: #aaa;
}

/* ===== Brand Story ===== */
.brand-story {
    background: #f4f6fc;
}
.dark .brand-story {
    background: rgba(15, 15, 26, 0.8);
}
.story-cards {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 32px;
}
.story-card {
    background: #fff;
    border-radius: 20px;
    padding: 36px 28px;
    box-shadow: 0 8px 30px rgba(0, 0, 0, 0.04);
    transition: all 0.4s;
    text-align: center;
}
.dark .story-card {
    background: rgba(30, 30, 50, 0.7);
}
.story-card:hover {
    transform: translateY(-6px);
}
.story-card .icon {
    font-size: 2.8rem;
    margin-bottom: 16px;
}
.story-card h3 {
    font-size: 1.3rem;
    margin-bottom: 12px;
}
.story-card p {
    color: #666;
    font-size: 0.95rem;
}
.dark .story-card p {
    color: #aaa;
}

/* ===== Culture ===== */
.culture {
    background: #fff;
}
.dark .culture {
    background: rgba(20, 20, 35, 0.9);
}
.culture-list {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: 24px;
}
.culture-item {
    text-align: center;
    padding: 28px 16px;
    border-radius: 16px;
    background: #f4f6fc;
    transition: all 0.4s;
}
.dark .culture-item {
    background: rgba(255, 255, 255, 0.04);
}
.culture-item:hover {
    background: rgba(240, 192, 64, 0.08);
}
.culture-item .num {
    font-size: 2.2rem;
    font-weight: 900;
    color: #f0c040;
}
.culture-item h4 {
    font-size: 1.1rem;
    margin: 8px 0 6px;
}
.culture-item p {
    font-size: 0.9rem;
    color: #666;
}
.dark .culture-item p {
    color: #aaa;
}

/* ===== Team ===== */
.team {
    background: #f4f6fc;
}
.dark .team {
    background: rgba(15, 15, 26, 0.8);
}
.team-grid {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: 28px;
}
.team-card {
    background: #fff;
    border-radius: 20px;
    padding: 28px 20px;
    text-align: center;
    box-shadow: 0 8px 30px rgba(0, 0, 0, 0.04);
    transition: all 0.4s;
}
.dark .team-card {
    background: rgba(30, 30, 50, 0.7);
}
.team-card:hover {
    transform: translateY(-6px);
}
.team-card .avatar {
    width: 80px;
    height: 80px;
    border-radius: 50%;
    margin: 0 auto 16px;
    background: linear-gradient(135deg, #f0c040, #e6a800);
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 2.2rem;
    font-weight: 900;
    color: #1a1a2e;
}
.team-card h4 {
    font-size: 1.1rem;
    margin-bottom: 4px;
}
.team-card .role {
    color: #f0c040;
    font-weight: 600;
    font-size: 0.9rem;
    margin-bottom: 8px;
}
.team-card p {
    font-size: 0.9rem;
    color: #666;
}
.dark .team-card p {
    color: #aaa;
}

/* ===== Products ===== */
.products {
    background: #fff;
}
.dark .products {
    background: rgba(20, 20, 35, 0.9);
}
.product-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 32px;
}
.product-card {
    background: #f4f6fc;
    border-radius: 20px;
    padding: 32px 24px;
    transition: all 0.4s;
    position: relative;
    overflow: hidden;
}
.dark .product-card {
    background: rgba(255, 255, 255, 0.04);
}
.product-card::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 4px;
    background: linear-gradient(90deg, #f0c040, #e6a800);
    opacity: 0;
    transition: opacity 0.4s;
}
.product-card:hover::before {
    opacity: 1;
}
.product-card:hover {
    transform: translateY(-6px);
}
.product-card .icon {
    font-size: 2.6rem;
    margin-bottom: 12px;
}
.product-card h3 {
    font-size: 1.3rem;
    margin-bottom: 8px;
}
.product-card p {
    color: #666;
    font-size: 0.95rem;
    margin-bottom: 16px;
}
.dark .product-card p {
    color: #aaa;
}
.product-card .tag {
    display: inline-block;
    padding: 4px 14px;
    border-radius: 40px;
    background: rgba(240, 192, 64, 0.15);
    color: #e6a800;
    font-size: 0.8rem;
    font-weight: 600;
}

/* ===== Advantages ===== */
.advantages {
    background: linear-gradient(160deg, #1a1a2e, #0f3460);
    color: #fff;
}
.advantages .section-title h2 {
    -webkit-text-fill-color: #fff;
    background: none;
    color: #fff;
}
.advantages .section-title p {
    color: rgba(255, 255, 255, 0.6);
}
.adv-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 32px;
}
.adv-card {
    background: rgba(255, 255, 255, 0.06);
    backdrop-filter: blur(12px);
    border-radius: 20px;
    padding: 32px 24px;
    border: 1px solid rgba(255, 255, 255, 0.08);
    transition: all 0.4s;
}
.adv-card:hover {
    background: rgba(255, 255, 255, 0.1);
    transform: translateY(-6px);
}
.adv-card .icon {
    font-size: 2.4rem;
    margin-bottom: 12px;
}
.adv-card h3 {
    font-size: 1.2rem;
    margin-bottom: 8px;
}
.adv-card p {
    color: rgba(255, 255, 255, 0.65);
    font-size: 0.95rem;
}

/* ===== Services ===== */
.services {
    background: #fff;
}
.dark .services {
    background: rgba(20, 20, 35, 0.9);
}
.service-grid {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: 24px;
}
.service-card {
    text-align: center;
    padding: 28px 16px;
    border-radius: 16px;
    background: #f4f6fc;
    transition: all 0.4s;
}
.dark .service-card {
    background: rgba(255, 255, 255, 0.04);
}
.service-card:hover {
    background: rgba(240, 192, 64, 0.08);
}
.service-card .icon {
    font-size: 2.4rem;
    margin-bottom: 12px;
}
.service-card h4 {
    font-size: 1.1rem;
    margin-bottom: 6px;
}
.service-card p {
    font-size: 0.9rem;
    color: #666;
}
.dark .service-card p {
    color: #aaa;
}

/* ===== Solutions ===== */
.solutions {
    background: #f4f6fc;
}
.dark .solutions {
    background: rgba(15, 15, 26, 0.8);
}
.solution-grid {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: 32px;
}
.solution-card {
    background: #fff;
    border-radius: 20px;
    padding: 32px;
    box-shadow: 0 8px 30px rgba(0, 0, 0, 0.04);
    transition: all 0.4s;
    display: flex;
    gap: 20px;
    align-items: flex-start;
}
.dark .solution-card {
    background: rgba(30, 30, 50, 0.7);
}
.solution-card:hover {
    transform: translateY(-4px);
}
.solution-card .icon {
    font-size: 2.4rem;
    flex-shrink: 0;
}
.solution-card h3 {
    font-size: 1.2rem;
    margin-bottom: 6px;
}
.solution-card p {
    color: #666;
    font-size: 0.95rem;
}
.dark .solution-card p {
    color: #aaa;
}

/* ===== Industries ===== */
.industries {
    background: #fff;
}
.dark .industries {
    background: rgba(20, 20, 35, 0.9);
}
.industry-grid {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: 20px;
}
.industry-item {
    text-align: center;
    padding: 24px 12px;
    border-radius: 16px;
    background: #f4f6fc;
    transition: all 0.4s;
    cursor: pointer;
}
.dark .industry-item {
    background: rgba(255, 255, 255, 0.04);
}
.industry-item:hover {
    background: rgba(240, 192, 64, 0.12);
    transform: translateY(-4px);
}
.industry-item .icon {
    font-size: 2.2rem;
    margin-bottom: 8px;
}
.industry-item h4 {
    font-size: 1rem;
}

/* ===== Data Showcase ===== */
.data-showcase {
    background: linear-gradient(160deg, #1a1a2e, #0f3460);
    color: #fff;
    text-align: center;
}
.data-showcase .section-title h2 {
    -webkit-text-fill-color: #fff;
    background: none;
    color: #fff;
}
.data-showcase .section-title p {
    color: rgba(255, 255, 255, 0.6);
}
.data-grid {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: 32px;
}
.data-item .num {
    font-size: 3.2rem;
    font-weight: 900;
    color: #f0c040;
}
.data-item .label {
    font-size: 1rem;
    color: rgba(255, 255, 255, 0.6);
    margin-top: 8px;
}

/* ===== Cases ===== */
.cases {
    background: #f4f6fc;
}
.dark .cases {
    background: rgba(15, 15, 26, 0.8);
}
.case-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 28px;
}
.case-card {
    background: #fff;
    border-radius: 20px;
    overflow: hidden;
    box-shadow: 0 8px 30px rgba(0, 0, 0, 0.04);
    transition: all 0.4s;
}
.dark .case-card {
    background: rgba(30, 30, 50, 0.7);
}
.case-card:hover {
    transform: translateY(-6px);
}
.case-card .case-img {
    height: 200px;
    background: linear-gradient(135deg, #f0c04022, #e6a80033);
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 3rem;
    color: #f0c040;
}
.case-card .case-body {
    padding: 24px;
}
.case-card .case-body h3 {
    font-size: 1.15rem;
    margin-bottom: 6px;
}
.case-card .case-body p {
    color: #666;
    font-size: 0.9rem;
}
.dark .case-card .case-body p {
    color: #aaa;
}

/* ===== Partners ===== */
.partners {
    background: #fff;
}
.dark .partners {
    background: rgba(20, 20, 35, 0.9);
}
.partner-grid {
    display: grid;
    grid-template-columns: repeat(6, 1fr);
    gap: 20px;
    align-items: center;
}
.partner-item {
    text-align: center;
    padding: 20px;
    background: #f4f6fc;
    border-radius: 16px;
    font-weight: 700;
    font-size: 0.95rem;
    color: #888;
    transition: all 0.4s;
    min-height: 80px;
    display: flex;
    align-items: center;
    justify-content: center;
}
.dark .partner-item {
    background: rgba(255, 255, 255, 0.04);
    color: #aaa;
}
.partner-item:hover {
    background: rgba(240, 192, 64, 0.1);
    color: #f0c040;
}

/* ===== Testimonials ===== */
.testimonials {
    background: #f4f6fc;
}
.dark .testimonials {
    background: rgba(15, 15, 26, 0.8);
}
.testimonial-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 28px;
}
.testimonial-card {
    background: #fff;
    border-radius: 20px;
    padding: 32px 24px;
    box-shadow: 0 8px 30px rgba(0, 0, 0, 0.04);
    transition: all 0.4s;
}
.dark .testimonial-card {
    background: rgba(30, 30, 50, 0.7);
}
.testimonial-card:hover {
    transform: translateY(-4px);
}
.testimonial-card .stars {
    color: #f0c040;
    font-size: 1.2rem;
    margin-bottom: 12px;
}
.testimonial-card p {
    font-style: italic;
    color: #555;
    margin-bottom: 16px;
}
.dark .testimonial-card p {
    color: #bbb;
}
.testimonial-card .author {
    display: flex;
    align-items: center;
    gap: 12px;
}
.testimonial-card .author .avatar {
    width: 44px;
    height: 44px;
    border-radius: 50%;
    background: linear-gradient(135deg, #f0c040, #e6a800);
    display: flex;
    align-items: center;
    justify-content: center;
    font-weight: 900;
    color: #1a1a2e;
}
.testimonial-card .author .name {
    font-weight: 700;
    font-size: 0.95rem;
}
.testimonial-card .author .title {
    font-size: 0.8rem;
    color: #888;
}
.dark .testimonial-card .author .title {
    color: #aaa;
}

/* ===== News ===== */
.news {
    background: #fff;
}
.dark .news {
    background: rgba(20, 20, 35, 0.9);
}
.news-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 28px;
}
.news-card {
    background: #f4f6fc;
    border-radius: 20px;
    padding: 24px;
    transition: all 0.4s;
}
.dark .news-card {
    background: rgba(255, 255, 255, 0.04);
}
.news-card:hover {
    transform: translateY(-4px);
}
.news-card .date {
    font-size: 0.85rem;
    color: #888;
    margin-bottom: 8px;
}
.news-card h3 {
    font-size: 1.1rem;
    margin-bottom: 8px;
}
.news-card p {
    color: #666;
    font-size: 0.9rem;
}
.dark .news-card p {
    color: #aaa;
}
.news-card .tag {
    display: inline-block;
    padding: 4px 12px;
    border-radius: 40px;
    background: rgba(240, 192, 64, 0.15);
    color: #e6a800;
    font-size: 0.75rem;
    font-weight: 600;
    margin-top: 12px;
}

/* ===== FAQ ===== */
.faq {
    background: #f4f6fc;
}
.dark .faq {
    background: rgba(15, 15, 26, 0.8);
}
.faq-list {
    max-width: 800px;
    margin: 0 auto;
}
.faq-item {
    border-bottom: 1px solid rgba(0, 0, 0, 0.06);
    padding: 20px 0;
    cursor: pointer;
}
.dark .faq-item {
    border-bottom: 1px solid rgba(255, 255, 255, 0.06);
}
.faq-question {
    display: flex;
    justify-content: space-between;
    align-items: center;
    font-weight: 700;
    font-size: 1.05rem;
    user-select: none;
}
.faq-question .icon {
    font-size: 1.4rem;
    transition: transform 0.3s;
}
.faq-item.open .faq-question .icon {
    transform: rotate(45deg);
}
.faq-answer {
    max-height: 0;
    overflow: hidden;
    transition: max-height 0.4s ease, opacity 0.3s;
    opacity: 0;
    color: #666;
    font-size: 0.95rem;
    padding-top: 0;
}
.dark .faq-answer {
    color: #aaa;
}
.faq-item.open .faq-answer {
    max-height: 300px;
    opacity: 1;
    padding-top: 16px;
}

/* ===== HowTo ===== */
.howto {
    background: #fff;
}
.dark .howto {
    background: rgba(20, 20, 35, 0.9);
}
.howto-steps {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: 24px;
}
.howto-step {
    text-align: center;
    padding: 28px 16px;
    border-radius: 16px;
    background: #f4f6fc;
    position: relative;
    transition: all 0.4s;
}
.dark .howto-step {
    background: rgba(255, 255, 255, 0.04);
}
.howto-step:hover {
    transform: translateY(-4px);
}
.howto-step .step-num {
    width: 48px;
    height: 48px;
    border-radius: 50%;
    background: linear-gradient(135deg, #f0c040, #e6a800);
    display: flex;
    align-items: center;
    justify-content: center;
    font-weight: 900;
    font-size: 1.2rem;
    color: #1a1a2e;
    margin: 0 auto 12px;
}
.howto-step h4 {
    font-size: 1.1rem;
    margin-bottom: 6px;
}
.howto-step p {
    font-size: 0.9rem;
    color: #666;
}
.dark .howto-step p {
    color: #aaa;
}

/* ===== Contact ===== */
.contact {
    background: #f4f6fc;
}
.dark .contact {
    background: rgba(15, 15, 26, 0.8);
}
.contact-grid {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 48px;
}
.contact-info h3 {
    font-size: 1.8rem;
    margin-bottom: 16px;
}
.contact-info p {
    color: #555;
    margin-bottom: 24px;
    font-size: 1.05rem;
}
.dark .contact-info p {
    color: #bbb;
}
.contact-detail {
    display: flex;
    align-items: center;
    gap: 16px;
    margin-bottom: 16px;
}
.contact-detail .icon {
    font-size: 1.4rem;
    color: #f0c040;
}
.contact-detail .text {
    font-weight: 500;
}
.contact-form {
    background: #fff;
    border-radius: 20px;
    padding: 36px;
    box-shadow: 0 10px 40px rgba(0, 0, 0, 0.06);
}
.dark .contact-form {
    background: rgba(30, 30, 50, 0.7);
}
.form-group {
    margin-bottom: 20px;
}
.form-group label {
    display: block;
    font-weight: 600;
    margin-bottom: 6px;
    font-size: 0.95rem;
}
.form-group input,
.form-group textarea {
    width: 100%;
    padding: 14px 18px;
    border: 2px solid rgba(0, 0, 0, 0.08);
    border-radius: 12px;
    font-size: 1rem;
    background: #f9fafc;
    transition: border 0.3s;
    font-family: inherit;
}
.dark .form-group input,
.dark .form-group textarea {
    background: rgba(255, 255, 255, 0.06);
    border-color: rgba(255, 255, 255, 0.1);
    color: #e0e0f0;
}
.form-group input:focus,
.form-group textarea:focus {
    outline: none;
    border-color: #f0c040;
}
.form-group textarea {
    min-height: 120px;
    resize: vertical;
}

/* ===== Footer ===== */
footer {
    background: #1a1a2e;
    color: rgba(255, 255, 255, 0.7);
    padding: 60px 0 30px;
}
.footer-grid {
    display: grid;
    grid-template-columns: 2fr 1fr 1fr 1fr 1fr;
    gap: 40px;
    margin-bottom: 40px;
}
.footer-brand .logo {
    color: #fff;
    margin-bottom: 12px;
}
.footer-brand p {
    font-size: 0.9rem;
    max-width: 300px;
}
.footer-col h4 {
    color: #fff;
    font-size: 1rem;
    margin-bottom: 16px;
    font-weight: 700;
}
.footer-col ul li {
    margin-bottom: 10px;
}
.footer-col ul li a {
    font-size: 0.9rem;
    transition: color 0.3s;
}
.footer-col ul li a:hover {
    color: #f0c040;
}
.footer-bottom {
    border-top: 1px solid rgba(255, 255, 255, 0.06);
    padding-top: 24px;
    display: flex;
    justify-content: space-between;
    flex-wrap: wrap;
    gap: 16px;
    font-size: 0.85rem;
}
.footer-bottom a {
    color: #f0c040;
}

/* ===== Back to Top ===== */
.back-top {
    position: fixed;
    bottom: 40px;
    right: 40px;
    width: 52px;
    height: 52px;
    border-radius: 50%;
    background: linear-gradient(135deg, #f0c040, #e6a800);
    color: #1a1a2e;
    border: none;
    font-size: 1.5rem;
    cursor: pointer;
    box-shadow: 0 8px 24px rgba(240, 192, 64, 0.35);
    opacity: 0;
    visibility: hidden;
    transform: translateY(20px);
    transition: all 0.4s;
    z-index: 999;
    display: flex;
    align-items: center;
    justify-content: center;
}
.back-top.visible {
    opacity: 1;
    visibility: visible;
    transform: translateY(0);
}
.back-top:hover {
    transform: translateY(-4px);
}

/* ===== Mobile Nav ===== */
.mobile-nav {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: rgba(26, 26, 46, 0.98);
    backdrop-filter: blur(20px);
    z-index: 2000;
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    gap: 24px;
    opacity: 0;
    visibility: hidden;
    transition: all 0.4s;
}
.mobile-nav.open {
    opacity: 1;
    visibility: visible;
}
.mobile-nav a {
    color: #fff;
    font-size: 1.6rem;
    font-weight: 700;
    transition: color 0.3s;
}
.mobile-nav a:hover {
    color: #f0c040;
}
.mobile-nav-close {
    position: absolute;
    top: 24px;
    right: 24px;
    background: none;
    border: none;
    color: #fff;
    font-size: 2.4rem;
    cursor: pointer;
}

/* ===== Scroll Animation ===== */
.fade-up {
    opacity: 0;
    transform: translateY(40px);
    transition: all 0.7s ease;
}
.fade-up.visible {
    opacity: 1;
    transform: translateY(0);
}

/* ===== Responsive ===== */
@media (max-width: 1024px) {
    .hero .container {
        grid-template-columns: 1fr;
        text-align: center;
    }
    .hero-content p {
        margin: 0 auto 36px;
    }
    .hero-btns {
        justify-content: center;
    }
    .about-grid {
        grid-template-columns: 1fr;
    }
    .grid-3,
    .grid-4,
    .story-cards,
    .culture-list,
    .team-grid,
    .product-grid,
    .adv-grid,
    .service-grid,
    .industry-grid,
    .data-grid,
    .case-grid,
    .partner-grid,
    .testimonial-grid,
    .news-grid,
    .howto-steps {
        grid-template-columns: repeat(2, 1fr);
    }
    .footer-grid {
        grid-template-columns: 1fr 1fr;
    }
    .solution-grid {
        grid-template-columns: 1fr;
    }
    .contact-grid {
        grid-template-columns: 1fr;
    }
}

@media (max-width: 768px) {
    .header-inner .nav-list {
        display: none;
    }
    .mobile-menu-btn {
        display: block;
    }
    .hero-content h1 {
        font-size: 2.4rem;
    }
    .section-title h2 {
        font-size: 2rem;
    }
    .grid-2,
    .grid-3,
    .grid-4,
    .story-cards,
    .culture-list,
    .team-grid,
    .product-grid,
    .adv-grid,
    .service-grid,
    .industry-grid,
    .data-grid,
    .case-grid,
    .partner-grid,
    .testimonial-grid,
    .news-grid,
    .howto-steps {
        grid-template-columns: 1fr;
    }
    .footer-grid {
        grid-template-columns: 1fr;
    }
    .hero-card {
        padding: 24px;
    }
    .back-top {
        bottom: 20px;
        right: 20px;
        width: 44px;
        height: 44px;
        font-size: 1.2rem;
    }
    .contact-form {
        padding: 24px;
    }
    .about-stats {
        grid-template-columns: 1fr 1fr;
    }
}

@media (max-width: 480px) {
    .hero-content h1 {
        font-size: 1.8rem;
    }
    .container {
        padding: 0 16px;
    }
    .section {
        padding: 50px 0;
    }
    .btn {
        padding: 12px 24px;
        font-size: 0.9rem;
    }
}