/* ============================================
   术码信息技术（四川）有限公司 - 企业官网样式
   ============================================ */

/* --- CSS Variables --- */
:root {
    --primary: #2D5BE3;
    --primary-light: #4F8EF7;
    --primary-dark: #1A3FA0;
    --secondary: #6C5CE7;
    --accent-green: #00B894;
    --accent-orange: #E17055;
    --gold: #C9A84C;
    --dark: #0A0F1E;
    --dark-2: #111827;
    --dark-3: #1A2035;
    --gray-100: #F7F8FC;
    --gray-200: #EDF0F7;
    --gray-300: #D5DAE6;
    --gray-400: #9CA3B8;
    --gray-500: #6B7280;
    --gray-600: #4B5563;
    --white: #FFFFFF;
    --font-cn: 'PingFang SC', 'Hiragino Sans GB', 'Microsoft YaHei', 'WenQuanYi Micro Hei', sans-serif;
    --font-en: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
    --shadow-sm: 0 2px 8px rgba(0,0,0,0.06);
    --shadow-md: 0 4px 20px rgba(0,0,0,0.08);
    --shadow-lg: 0 8px 40px rgba(0,0,0,0.12);
    --shadow-xl: 0 16px 60px rgba(0,0,0,0.15);
    --radius-sm: 8px;
    --radius-md: 12px;
    --radius-lg: 20px;
    --radius-xl: 28px;
    --transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
}

/* --- Reset & Base --- */
*, *::before, *::after { margin: 0; padding: 0; box-sizing: border-box; }

html {
    scroll-behavior: smooth;
    font-size: 16px;
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
}

body {
    font-family: var(--font-cn);
    color: var(--gray-600);
    background: var(--white);
    line-height: 1.7;
    overflow-x: hidden;
}

a { text-decoration: none; color: inherit; transition: var(--transition); }
ul { list-style: none; }
img { max-width: 100%; display: block; }
button { cursor: pointer; border: none; outline: none; background: none; font-family: inherit; }
input, textarea { font-family: inherit; outline: none; }

.container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 24px;
}

/* --- Animations --- */
@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 fadeInRight {
    from { opacity: 0; transform: translateX(40px); }
    to { opacity: 1; transform: translateX(0); }
}

@keyframes float {
    0%, 100% { transform: translateY(0px); }
    50% { transform: translateY(-12px); }
}

@keyframes pulse {
    0%, 100% { opacity: 0.6; }
    50% { opacity: 1; }
}

@keyframes scrollWheel {
    0% { transform: translateY(0); opacity: 1; }
    100% { transform: translateY(8px); opacity: 0; }
}

@keyframes scrollDown {
    0%, 100% { transform: translateY(0); }
    50% { transform: translateY(6px); }
}

@keyframes partnerScroll {
    0% { transform: translateX(0); }
    100% { transform: translateX(-50%); }
}

[data-animate] {
    opacity: 0;
    transition: opacity 0.8s ease, transform 0.8s ease;
}

[data-animate="fadeInUp"].visible {
    animation: fadeInUp 0.8s ease forwards;
}

[data-animate="fadeInLeft"].visible {
    animation: fadeInLeft 0.8s ease forwards;
}

[data-animate="fadeInRight"].visible {
    animation: fadeInRight 0.8s ease forwards;
}

/* --- Navbar --- */
.navbar {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    z-index: 1000;
    padding: 16px 0;
    transition: var(--transition);
}

.navbar.scrolled {
    background: rgba(255,255,255,0.95);
    backdrop-filter: blur(20px);
    -webkit-backdrop-filter: blur(20px);
    box-shadow: var(--shadow-sm);
    padding: 10px 0;
}

.nav-container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 24px;
    display: flex;
    align-items: center;
    justify-content: space-between;
}

.nav-logo {
    display: flex;
    align-items: center;
    gap: 10px;
    z-index: 1001;
}

.logo-img {
    height: 38px;
    width: auto;
    object-fit: contain;
    border-radius: 6px;
    transition: var(--transition);
}

.navbar.scrolled .logo-img {
    height: 34px;
}

.logo-text {
    font-size: 20px;
    font-weight: 700;
    color: var(--white);
    transition: var(--transition);
}

.navbar.scrolled .logo-text { color: var(--dark); }

.nav-menu {
    display: flex;
    align-items: center;
    gap: 4px;
}

.nav-link {
    padding: 8px 18px;
    font-size: 15px;
    font-weight: 500;
    color: rgba(255,255,255,0.8);
    border-radius: 8px;
    transition: var(--transition);
    position: relative;
}

.navbar.scrolled .nav-link { color: var(--gray-500); }

.nav-link:hover,
.nav-link.active {
    color: var(--white);
    background: rgba(255,255,255,0.1);
}

.navbar.scrolled .nav-link:hover,
.navbar.scrolled .nav-link.active {
    color: var(--primary);
    background: rgba(45,91,227,0.08);
}

.nav-toggle {
    display: none;
    flex-direction: column;
    gap: 5px;
    z-index: 1001;
    cursor: pointer;
}

.nav-toggle span {
    width: 24px;
    height: 2px;
    background: var(--white);
    border-radius: 2px;
    transition: var(--transition);
}

.navbar.scrolled .nav-toggle span { background: var(--dark); }

.nav-toggle.active span:nth-child(1) {
    transform: rotate(45deg) translate(5px, 5px);
}
.nav-toggle.active span:nth-child(2) { opacity: 0; }
.nav-toggle.active span:nth-child(3) {
    transform: rotate(-45deg) translate(5px, -5px);
}

/* --- Hero --- */
.hero {
    position: relative;
    min-height: 100vh;
    display: flex;
    align-items: center;
    justify-content: center;
    background: linear-gradient(135deg, #0A0F1E 0%, #1A2035 30%, #0D1B3E 60%, #0A1628 100%);
    overflow: hidden;
}

#particleCanvas {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    z-index: 1;
}

.hero-overlay {
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: radial-gradient(ellipse at 30% 50%, rgba(45,91,227,0.15) 0%, transparent 60%),
                radial-gradient(ellipse at 70% 50%, rgba(108,92,231,0.1) 0%, transparent 60%);
    z-index: 2;
}

.hero-content {
    position: relative;
    z-index: 3;
    text-align: center;
    padding: 0 24px;
    max-width: 900px;
}

.hero-badge {
    display: inline-block;
    padding: 8px 24px;
    background: rgba(79,142,247,0.15);
    border: 1px solid rgba(79,142,247,0.3);
    border-radius: 50px;
    color: var(--primary-light);
    font-size: 14px;
    font-weight: 500;
    letter-spacing: 2px;
    margin-bottom: 28px;
    backdrop-filter: blur(10px);
}

.hero-title {
    font-size: 56px;
    font-weight: 800;
    line-height: 1.2;
    margin-bottom: 24px;
    color: var(--white);
}

.title-accent {
    background: linear-gradient(135deg, #4F8EF7, #6C5CE7, #A29BFE);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.title-sub {
    font-size: 36px;
    font-weight: 600;
    opacity: 0.9;
}

.hero-desc {
    font-size: 20px;
    color: rgba(255,255,255,0.65);
    max-width: 600px;
    margin: 0 auto 40px;
    line-height: 1.6;
}

.hero-buttons {
    display: flex;
    gap: 16px;
    justify-content: center;
    margin-bottom: 60px;
}

.btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    padding: 14px 36px;
    font-size: 16px;
    font-weight: 600;
    border-radius: var(--radius-md);
    transition: var(--transition);
    cursor: pointer;
}

.btn-primary {
    background: linear-gradient(135deg, var(--primary), var(--secondary));
    color: var(--white);
    box-shadow: 0 4px 20px rgba(45,91,227,0.4);
}

.btn-primary:hover {
    transform: translateY(-2px);
    box-shadow: 0 6px 30px rgba(45,91,227,0.5);
}

.btn-outline {
    border: 2px solid rgba(255,255,255,0.3);
    color: var(--white);
    background: rgba(255,255,255,0.05);
    backdrop-filter: blur(10px);
}

.btn-outline:hover {
    background: rgba(255,255,255,0.15);
    border-color: rgba(255,255,255,0.5);
    transform: translateY(-2px);
}

.btn-full { width: 100%; }

.hero-stats {
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 32px;
    padding: 28px 40px;
    background: rgba(255,255,255,0.05);
    border: 1px solid rgba(255,255,255,0.1);
    border-radius: var(--radius-lg);
    backdrop-filter: blur(20px);
}

.stat-item { text-align: center; }

.stat-num {
    font-size: 36px;
    font-weight: 800;
    color: var(--white);
    font-family: var(--font-en);
}

.stat-suffix {
    font-size: 20px;
    font-weight: 700;
    color: var(--primary-light);
}

.stat-label {
    display: block;
    font-size: 13px;
    color: rgba(255,255,255,0.5);
    margin-top: 4px;
}

.stat-divider {
    width: 1px;
    height: 40px;
    background: rgba(255,255,255,0.15);
}

.scroll-indicator {
    position: absolute;
    bottom: 36px;
    left: 50%;
    transform: translateX(-50%);
    z-index: 3;
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 8px;
    color: rgba(255,255,255,0.4);
    font-size: 12px;
    animation: scrollDown 2s ease infinite;
}

.mouse {
    width: 24px;
    height: 38px;
    border: 2px solid rgba(255,255,255,0.3);
    border-radius: 12px;
    display: flex;
    justify-content: center;
    padding-top: 6px;
}

.wheel {
    width: 3px;
    height: 8px;
    background: rgba(255,255,255,0.5);
    border-radius: 2px;
    animation: scrollWheel 1.5s ease infinite;
}

/* --- Section Common --- */
.section {
    padding: 100px 0;
}

.section-header {
    text-align: center;
    margin-bottom: 64px;
}

.section-tag {
    display: inline-block;
    padding: 6px 20px;
    background: rgba(45,91,227,0.08);
    color: var(--primary);
    font-size: 13px;
    font-weight: 700;
    letter-spacing: 3px;
    border-radius: 50px;
    margin-bottom: 16px;
}

.section-title {
    font-size: 40px;
    font-weight: 800;
    color: var(--dark);
    margin-bottom: 16px;
}

.section-line {
    width: 60px;
    height: 4px;
    background: linear-gradient(90deg, var(--primary), var(--secondary));
    border-radius: 2px;
    margin: 0 auto 20px;
}

.section-desc {
    font-size: 17px;
    color: var(--gray-500);
    max-width: 600px;
    margin: 0 auto;
}

/* --- About --- */
.about {
    background: var(--gray-100);
}

.about-grid {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 60px;
    align-items: center;
}

.about-img-wrapper {
    position: relative;
}

.about-img-placeholder {
    border-radius: var(--radius-lg);
    overflow: hidden;
    box-shadow: var(--shadow-lg);
}

.about-float-card {
    position: absolute;
    display: flex;
    align-items: center;
    gap: 10px;
    padding: 14px 22px;
    background: var(--white);
    border-radius: var(--radius-md);
    box-shadow: var(--shadow-md);
    animation: float 4s ease-in-out infinite;
}

.about-float-card.card-1 {
    top: -20px;
    right: -20px;
    animation-delay: 0s;
}

.about-float-card.card-2 {
    bottom: -20px;
    left: -20px;
    animation-delay: 2s;
}

.float-icon { font-size: 24px; }

.about-float-card span {
    font-size: 14px;
    font-weight: 600;
    color: var(--dark);
}

.about-subtitle {
    font-size: 26px;
    font-weight: 700;
    color: var(--dark);
    margin-bottom: 20px;
}

.about-text {
    font-size: 15px;
    line-height: 1.8;
    color: var(--gray-500);
    margin-bottom: 16px;
}

.about-features {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 20px;
    margin-top: 32px;
}

.about-feature {
    display: flex;
    align-items: flex-start;
    gap: 14px;
    padding: 16px;
    background: var(--white);
    border-radius: var(--radius-md);
    transition: var(--transition);
}

.about-feature:hover {
    box-shadow: var(--shadow-md);
    transform: translateY(-2px);
}

.feature-icon {
    flex-shrink: 0;
    width: 44px;
    height: 44px;
    display: flex;
    align-items: center;
    justify-content: center;
    background: rgba(45,91,227,0.08);
    border-radius: 10px;
    color: var(--primary);
}

.feature-icon svg {
    width: 22px;
    height: 22px;
}

.about-feature h4 {
    font-size: 15px;
    font-weight: 700;
    color: var(--dark);
    margin-bottom: 2px;
}

.about-feature p {
    font-size: 13px;
    color: var(--gray-400);
}

.about-info-grid {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 16px;
    margin-top: 24px;
    padding: 20px;
    background: linear-gradient(135deg, rgba(79,142,247,0.04), rgba(108,92,231,0.04));
    border-radius: var(--radius-md);
    border: 1px solid rgba(79,142,247,0.1);
}

.about-info-grid .info-item {
    display: flex;
    flex-direction: column;
    gap: 4px;
}

.about-info-grid .info-label {
    font-size: 12px;
    color: var(--gray-400);
    font-weight: 500;
}

.about-info-grid .info-value {
    font-size: 14px;
    color: var(--dark);
    font-weight: 600;
}

/* --- Business --- */
.business {
    background: var(--white);
}

.business-grid {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: 28px;
}

.business-card {
    position: relative;
    padding: 40px 32px;
    background: var(--white);
    border: 1px solid var(--gray-200);
    border-radius: var(--radius-lg);
    transition: var(--transition);
    overflow: hidden;
}

.business-card:hover {
    border-color: transparent;
    box-shadow: var(--shadow-xl);
    transform: translateY(-4px);
}

.business-card-glow {
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    height: 3px;
    background: linear-gradient(90deg, var(--primary), var(--secondary));
    opacity: 0;
    transition: var(--transition);
}

.business-card:hover .business-card-glow { opacity: 1; }

.business-icon {
    width: 64px;
    height: 64px;
    margin-bottom: 24px;
}

.business-card h3 {
    font-size: 22px;
    font-weight: 700;
    color: var(--dark);
    margin-bottom: 14px;
}

.business-card > p {
    font-size: 15px;
    color: var(--gray-500);
    line-height: 1.7;
    margin-bottom: 20px;
}

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

.business-tags li {
    padding: 5px 14px;
    background: rgba(45,91,227,0.06);
    color: var(--primary);
    font-size: 13px;
    font-weight: 500;
    border-radius: 50px;
}

/* --- Certificates --- */
.certificates {
    background: linear-gradient(180deg, #0A0F1E 0%, #111827 100%);
    position: relative;
    overflow: hidden;
}

.certificates::before {
    content: '';
    position: absolute;
    top: -200px;
    right: -200px;
    width: 600px;
    height: 600px;
    background: radial-gradient(circle, rgba(45,91,227,0.08), transparent 70%);
    pointer-events: none;
}

.certificates .section-tag {
    background: rgba(79,142,247,0.15);
    color: var(--primary-light);
}

.certificates .section-title { color: var(--white); }

.certificates .section-desc { color: rgba(255,255,255,0.5); }

.cert-grid {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: 24px;
}

.cert-card {
    text-align: center;
    transition: var(--transition);
}

.cert-card:hover { transform: translateY(-6px); }

.cert-frame {
    position: relative;
    background: linear-gradient(135deg, #FAFAFA, #F0F0F0);
    border: 2px solid var(--gold);
    border-radius: var(--radius-md);
    padding: 28px 20px 20px;
    margin-bottom: 16px;
    overflow: hidden;
    box-shadow: 0 4px 20px rgba(0,0,0,0.2);
}

.cert-seal {
    position: absolute;
    top: 8px;
    right: 8px;
    opacity: 0.7;
}

.cert-ribbon {
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    height: 4px;
    background: linear-gradient(90deg, #C9A84C, #E8D48B, #C9A84C);
}

.cert-ribbon.blue {
    background: linear-gradient(90deg, #2D5BE3, #4F8EF7, #2D5BE3);
}

.cert-ribbon.green {
    background: linear-gradient(90deg, #00B894, #55EFC4, #00B894);
}

.cert-ribbon.orange {
    background: linear-gradient(90deg, #E17055, #FAB1A0, #E17055);
}

.cert-inner { text-align: center; }

.cert-header {
    font-size: 12px;
    color: var(--gray-400);
    letter-spacing: 2px;
    margin-bottom: 10px;
}

.cert-type {
    font-size: 16px;
    font-weight: 700;
    color: var(--dark);
    margin-bottom: 16px;
    padding-bottom: 12px;
    border-bottom: 1px solid var(--gray-200);
}

.cert-body p {
    font-size: 13px;
    color: var(--gray-500);
    line-height: 1.8;
}

.cert-company {
    font-size: 14px !important;
    font-weight: 700 !important;
    color: var(--dark) !important;
}

.cert-footer {
    margin-top: 14px;
    padding-top: 10px;
    border-top: 1px solid var(--gray-200);
    font-size: 11px;
    color: var(--gray-400);
}

.cert-card h4 {
    font-size: 16px;
    font-weight: 700;
    color: var(--white);
    margin-bottom: 4px;
}

.cert-card p {
    font-size: 13px;
    color: rgba(255,255,255,0.5);
}

/* --- Products --- */
.products {
    background: var(--gray-100);
}

.products-grid {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 28px;
}

.product-card {
    position: relative;
    background: var(--white);
    border-radius: var(--radius-lg);
    overflow: hidden;
    border: 1px solid var(--gray-200);
    transition: var(--transition);
}

.product-card:hover {
    box-shadow: var(--shadow-lg);
    transform: translateY(-4px);
    border-color: transparent;
}

.product-card.featured {
    border-color: rgba(45,91,227,0.2);
}

.product-badge {
    position: absolute;
    top: 20px;
    right: 20px;
    padding: 6px 16px;
    background: linear-gradient(135deg, var(--primary), var(--secondary));
    color: var(--white);
    font-size: 12px;
    font-weight: 600;
    border-radius: 50px;
    z-index: 2;
}

.product-preview {
    padding: 32px 32px 0;
}

.product-preview svg {
    border-radius: var(--radius-md);
}

.product-info {
    padding: 24px 32px 32px;
}

.product-info h3 {
    font-size: 20px;
    font-weight: 700;
    color: var(--dark);
    margin-bottom: 12px;
}

.product-info p {
    font-size: 14px;
    color: var(--gray-500);
    line-height: 1.7;
    margin-bottom: 16px;
}

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

.product-tags span {
    padding: 5px 14px;
    background: rgba(45,91,227,0.06);
    color: var(--primary);
    font-size: 12px;
    font-weight: 500;
    border-radius: 50px;
}

/* --- Partners --- */
.partners {
    background: var(--white);
    padding: 80px 0;
}

.partners-track {
    overflow: hidden;
    mask-image: linear-gradient(90deg, transparent, black 10%, black 90%, transparent);
    -webkit-mask-image: linear-gradient(90deg, transparent, black 10%, black 90%, transparent);
}

.partners-scroll {
    display: flex;
    gap: 0;
    animation: partnerScroll 30s linear infinite;
    width: max-content;
}

.partner-item {
    flex-shrink: 0;
    padding: 16px 36px;
    font-size: 15px;
    font-weight: 600;
    color: var(--gray-400);
    white-space: nowrap;
    transition: var(--transition);
}

.partner-item:hover { color: var(--primary); }

/* --- Contact --- */
.contact {
    background: var(--gray-100);
}

.contact-grid {
    display: grid;
    grid-template-columns: 1fr 1.2fr;
    gap: 48px;
    align-items: start;
}

/* 二维码展示区 */
.qr-showcase {
    grid-column: 1 / -1;
    text-align: center;
    padding: 40px 20px;
    background: linear-gradient(135deg, rgba(45,91,227,0.04), rgba(108,92,231,0.04));
    border-radius: var(--radius-lg);
    border: 1px solid rgba(45,91,227,0.08);
    margin-bottom: 12px;
}

.qr-title {
    font-size: 22px;
    font-weight: 700;
    color: var(--dark);
    margin-bottom: 28px;
    position: relative;
    display: inline-block;
}

.qr-title::after {
    content: '';
    position: absolute;
    bottom: -8px;
    left: 50%;
    transform: translateX(-50%);
    width: 40px;
    height: 3px;
    background: linear-gradient(90deg, var(--primary), var(--secondary));
    border-radius: 2px;
}

.qr-grid {
    display: flex;
    justify-content: center;
    gap: 32px;
    flex-wrap: wrap;
}

.qr-item {
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 10px;
}

.qr-item img {
    width: 140px;
    height: 140px;
    object-fit: contain;
    border-radius: 12px;
    border: 1px solid var(--gray-200);
    padding: 8px;
    background: var(--white);
    transition: var(--transition);
    box-shadow: var(--shadow-sm);
}

.qr-item img:hover {
    transform: translateY(-4px) scale(1.05);
    box-shadow: var(--shadow-md);
}

.qr-item span {
    font-size: 13px;
    color: var(--gray-500);
    font-weight: 500;
}

.contact-item {
    display: flex;
    gap: 18px;
    padding: 20px;
    background: var(--white);
    border-radius: var(--radius-md);
    margin-bottom: 16px;
    transition: var(--transition);
}

.contact-item:hover {
    box-shadow: var(--shadow-md);
    transform: translateX(4px);
}

.contact-icon {
    flex-shrink: 0;
    width: 48px;
    height: 48px;
    display: flex;
    align-items: center;
    justify-content: center;
    background: rgba(45,91,227,0.08);
    border-radius: 12px;
    color: var(--primary);
}

.contact-icon svg {
    width: 22px;
    height: 22px;
}

.contact-item h4 {
    font-size: 15px;
    font-weight: 700;
    color: var(--dark);
    margin-bottom: 4px;
}

.contact-item p {
    font-size: 14px;
    color: var(--gray-500);
}

.contact-form-wrapper {
    background: var(--white);
    padding: 36px;
    border-radius: var(--radius-lg);
    box-shadow: var(--shadow-md);
}

.form-row {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 16px;
}

.form-group {
    margin-bottom: 20px;
}

.form-group label {
    display: block;
    font-size: 14px;
    font-weight: 600;
    color: var(--dark);
    margin-bottom: 8px;
}

.form-group input,
.form-group textarea {
    width: 100%;
    padding: 12px 16px;
    border: 1px solid var(--gray-200);
    border-radius: var(--radius-sm);
    font-size: 14px;
    color: var(--dark);
    background: var(--gray-100);
    transition: var(--transition);
}

.form-group input:focus,
.form-group textarea:focus {
    border-color: var(--primary);
    background: var(--white);
    box-shadow: 0 0 0 3px rgba(45,91,227,0.1);
}

.form-group textarea {
    resize: vertical;
    min-height: 120px;
}

/* --- Footer --- */
.footer {
    background: var(--dark);
    color: rgba(255,255,255,0.6);
    padding: 64px 0 0;
}

.footer-grid {
    display: grid;
    grid-template-columns: 1.5fr 1fr 1fr 1fr;
    gap: 48px;
    padding-bottom: 48px;
    border-bottom: 1px solid rgba(255,255,255,0.08);
}

.footer-logo {
    display: flex;
    align-items: center;
    gap: 10px;
    margin-bottom: 16px;
}

.footer-logo-img {
    height: 34px;
    width: auto;
    object-fit: contain;
    border-radius: 6px;
}

.footer-logo span {
    font-size: 18px;
    font-weight: 700;
    color: var(--white);
}

.footer-desc {
    font-size: 14px;
    line-height: 1.7;
}

.footer-links h4 {
    font-size: 16px;
    font-weight: 700;
    color: var(--white);
    margin-bottom: 20px;
}

.footer-links ul li {
    margin-bottom: 10px;
    font-size: 14px;
}

.footer-links a:hover { color: var(--primary-light); }

.footer-bottom {
    text-align: center;
    padding: 24px 0;
    font-size: 13px;
    color: rgba(255,255,255,0.35);
}

.footer-bottom a {
    color: rgba(255,255,255,0.5);
}

.footer-bottom a:hover { color: var(--primary-light); }

/* --- 移动端底部导航基础 --- */
.mobile-bottom-nav {
    display: none;
}

.nav-overlay {
    display: none;
}

/* --- Back to Top --- */
.back-to-top {
    position: fixed;
    bottom: 32px;
    right: 32px;
    width: 48px;
    height: 48px;
    display: flex;
    align-items: center;
    justify-content: center;
    background: var(--primary);
    color: var(--white);
    border-radius: 50%;
    box-shadow: 0 4px 20px rgba(45,91,227,0.4);
    z-index: 999;
    opacity: 0;
    visibility: hidden;
    transform: translateY(20px);
    transition: var(--transition);
}

.back-to-top.visible {
    opacity: 1;
    visibility: visible;
    transform: translateY(0);
}

.back-to-top:hover {
    transform: translateY(-3px);
    box-shadow: 0 6px 30px rgba(45,91,227,0.5);
}

/* --- 发展历程 --- */
.timeline-section {
    background: var(--white);
}

.timeline {
    position: relative;
    max-width: 800px;
    margin: 0 auto;
    padding-left: 40px;
}

.timeline::before {
    content: '';
    position: absolute;
    left: 14px;
    top: 0;
    bottom: 0;
    width: 2px;
    background: linear-gradient(180deg, var(--primary), var(--secondary));
    border-radius: 1px;
}

.timeline-item {
    position: relative;
    margin-bottom: 36px;
    padding-left: 28px;
}

.timeline-item:last-child {
    margin-bottom: 0;
}

.timeline-dot {
    position: absolute;
    left: -33px;
    top: 6px;
    width: 12px;
    height: 12px;
    border-radius: 50%;
    background: var(--white);
    border: 3px solid var(--primary);
    z-index: 1;
    transition: var(--transition);
}

.timeline-dot.active {
    background: var(--primary);
    box-shadow: 0 0 0 4px rgba(45,91,227,0.2);
}

.timeline-item:hover .timeline-dot {
    transform: scale(1.3);
    background: var(--primary);
}

.timeline-content {
    background: var(--gray-100);
    border-radius: var(--radius-md);
    padding: 20px 24px;
    transition: var(--transition);
    border: 1px solid transparent;
}

.timeline-item:hover .timeline-content {
    border-color: rgba(45,91,227,0.15);
    box-shadow: var(--shadow-sm);
}

.timeline-year {
    display: inline-block;
    font-size: 13px;
    font-weight: 700;
    color: var(--primary);
    background: rgba(45,91,227,0.08);
    padding: 2px 12px;
    border-radius: 50px;
    margin-bottom: 8px;
}

.timeline-content h4 {
    font-size: 16px;
    font-weight: 700;
    color: var(--dark);
    margin-bottom: 6px;
}

.timeline-content p {
    font-size: 14px;
    color: var(--gray-500);
    line-height: 1.7;
}

/* --- 技术实力 --- */
.tech-section {
    background: linear-gradient(180deg, #F8F9FF 0%, var(--white) 100%);
}

.tech-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 20px;
}

.tech-card {
    background: var(--white);
    border-radius: var(--radius-lg);
    padding: 28px 24px;
    border: 1px solid var(--gray-200);
    transition: var(--transition);
}

.tech-card:hover {
    transform: translateY(-4px);
    box-shadow: var(--shadow-md);
    border-color: rgba(45,91,227,0.2);
}

.tech-icon {
    width: 48px;
    height: 48px;
    border-radius: 12px;
    display: flex;
    align-items: center;
    justify-content: center;
    margin-bottom: 16px;
    transition: var(--transition);
}

.tech-icon svg {
    width: 24px;
    height: 24px;
}

.tech-icon.frontend { background: rgba(79,142,247,0.1); color: #4F8EF7; }
.tech-icon.backend { background: rgba(108,92,231,0.1); color: #6C5CE7; }
.tech-icon.cloud { background: rgba(0,184,148,0.1); color: #00B894; }
.tech-icon.data { background: rgba(225,112,85,0.1); color: #E17055; }
.tech-icon.mobile { background: rgba(253,121,168,0.1); color: #FD79A8; }
.tech-icon.security { background: rgba(45,91,227,0.1); color: #2D5BE3; }

.tech-card h4 {
    font-size: 16px;
    font-weight: 700;
    color: var(--dark);
    margin-bottom: 14px;
}

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

.tech-tags span {
    padding: 4px 12px;
    background: var(--gray-100);
    color: var(--gray-600);
    font-size: 12px;
    font-weight: 500;
    border-radius: 6px;
    transition: var(--transition);
}

.tech-card:hover .tech-tags span {
    background: rgba(45,91,227,0.06);
    color: var(--primary);
}

/* --- 成功案例 --- */
.cases-section {
    background: var(--gray-100);
}

.cases-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 24px;
}

.case-card {
    background: var(--white);
    border-radius: var(--radius-lg);
    overflow: hidden;
    border: 1px solid var(--gray-200);
    transition: var(--transition);
}

.case-card:hover {
    transform: translateY(-6px);
    box-shadow: var(--shadow-lg);
    border-color: transparent;
}

.case-img {
    overflow: hidden;
}

.case-img svg {
    display: block;
    transition: var(--transition);
}

.case-card:hover .case-img svg {
    transform: scale(1.05);
}

.case-info {
    padding: 20px 24px 24px;
}

.case-tag {
    display: inline-block;
    padding: 3px 12px;
    background: rgba(79,142,247,0.1);
    color: var(--primary);
    font-size: 12px;
    font-weight: 600;
    border-radius: 50px;
    margin-bottom: 10px;
}

.case-tag.purple {
    background: rgba(108,92,231,0.1);
    color: #6C5CE7;
}

.case-tag.green {
    background: rgba(0,184,148,0.1);
    color: #00B894;
}

.case-info h4 {
    font-size: 17px;
    font-weight: 700;
    color: var(--dark);
    margin-bottom: 8px;
}

.case-info > p {
    font-size: 14px;
    color: var(--gray-500);
    line-height: 1.7;
    margin-bottom: 16px;
}

.case-metrics {
    display: flex;
    gap: 16px;
    padding-top: 14px;
    border-top: 1px solid var(--gray-200);
}

.metric {
    text-align: center;
    flex: 1;
}

.metric strong {
    display: block;
    font-size: 18px;
    font-weight: 700;
    color: var(--primary);
}

.metric span {
    font-size: 11px;
    color: var(--gray-400);
}

/* --- 服务流程 --- */
.process-section {
    background: linear-gradient(180deg, #0A0F1E 0%, #111827 100%);
    position: relative;
    overflow: hidden;
}

.process-section::before {
    content: '';
    position: absolute;
    top: -200px;
    left: -200px;
    width: 500px;
    height: 500px;
    background: radial-gradient(circle, rgba(45,91,227,0.08), transparent 70%);
    pointer-events: none;
}

.process-section .section-tag {
    background: rgba(79,142,247,0.15);
    color: var(--primary-light);
}

.process-section .section-title { color: var(--white); }
.process-section .section-desc { color: rgba(255,255,255,0.5); }

.process-steps {
    display: flex;
    align-items: flex-start;
    gap: 0;
    justify-content: center;
}

.process-step {
    flex: 1;
    max-width: 200px;
    text-align: center;
    position: relative;
}

.step-number {
    font-size: 32px;
    font-weight: 800;
    color: rgba(255,255,255,0.06);
    line-height: 1;
    margin-bottom: 12px;
}

.step-icon {
    width: 56px;
    height: 56px;
    margin: 0 auto 14px;
    border-radius: 16px;
    background: rgba(45,91,227,0.15);
    display: flex;
    align-items: center;
    justify-content: center;
    color: var(--primary-light);
    transition: var(--transition);
}

.step-icon svg {
    width: 26px;
    height: 26px;
}

.process-step:hover .step-icon {
    background: var(--primary);
    color: var(--white);
    transform: scale(1.1);
}

.process-step h4 {
    font-size: 15px;
    font-weight: 700;
    color: var(--white);
    margin-bottom: 8px;
}

.process-step p {
    font-size: 13px;
    color: rgba(255,255,255,0.4);
    line-height: 1.6;
}

.process-connector {
    width: 40px;
    height: 2px;
    background: linear-gradient(90deg, rgba(45,91,227,0.3), rgba(45,91,227,0.1));
    margin-top: 86px;
    flex-shrink: 0;
}

/* --- 客户评价 --- */
.testimonials-section {
    background: var(--white);
}

.testimonials-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 24px;
}

.testimonial-card {
    background: var(--gray-100);
    border-radius: var(--radius-lg);
    padding: 28px 24px;
    transition: var(--transition);
    border: 1px solid transparent;
}

.testimonial-card:hover {
    transform: translateY(-4px);
    box-shadow: var(--shadow-md);
    border-color: rgba(45,91,227,0.15);
}

.testimonial-stars {
    color: #FDCB6E;
    font-size: 16px;
    letter-spacing: 2px;
    margin-bottom: 14px;
}

.testimonial-text {
    font-size: 14px;
    color: var(--gray-600);
    line-height: 1.8;
    margin-bottom: 20px;
    font-style: italic;
}

.testimonial-author {
    display: flex;
    align-items: center;
    gap: 12px;
}

.author-avatar {
    width: 40px;
    height: 40px;
    border-radius: 50%;
    background: linear-gradient(135deg, #4F8EF7, #2D5BE3);
    color: white;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 14px;
    font-weight: 700;
    flex-shrink: 0;
}

.author-avatar.purple {
    background: linear-gradient(135deg, #6C5CE7, #A29BFE);
}

.author-avatar.green {
    background: linear-gradient(135deg, #00B894, #55EFC4);
}

.testimonial-author strong {
    display: block;
    font-size: 14px;
    color: var(--dark);
}

.testimonial-author span {
    font-size: 12px;
    color: var(--gray-400);
}

/* --- 常见问题 --- */
.faq-section {
    background: var(--gray-100);
}

.faq-list {
    max-width: 760px;
    margin: 0 auto;
}

.faq-item {
    background: var(--white);
    border-radius: var(--radius-md);
    margin-bottom: 12px;
    border: 1px solid var(--gray-200);
    overflow: hidden;
    transition: var(--transition);
}

.faq-item:hover {
    border-color: rgba(45,91,227,0.2);
}

.faq-item.active {
    border-color: rgba(45,91,227,0.3);
    box-shadow: var(--shadow-sm);
}

.faq-question {
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: 18px 24px;
    cursor: pointer;
    user-select: none;
    -webkit-user-select: none;
}

.faq-question h4 {
    font-size: 15px;
    font-weight: 600;
    color: var(--dark);
    flex: 1;
    padding-right: 16px;
}

.faq-toggle {
    flex-shrink: 0;
    width: 28px;
    height: 28px;
    border-radius: 50%;
    background: var(--gray-100);
    display: flex;
    align-items: center;
    justify-content: center;
    color: var(--gray-400);
    transition: var(--transition);
}

.faq-item.active .faq-toggle {
    background: rgba(45,91,227,0.1);
    color: var(--primary);
    transform: rotate(45deg);
}

.faq-answer {
    max-height: 0;
    overflow: hidden;
    transition: max-height 0.35s ease, padding 0.35s ease;
}

.faq-item.active .faq-answer {
    max-height: 300px;
}

.faq-answer p {
    padding: 0 24px 20px;
    font-size: 14px;
    color: var(--gray-500);
    line-height: 1.8;
}

/* --- Responsive (Tablet) --- */
@media (max-width: 1024px) {
    .hero-title { font-size: 42px; }
    .title-sub { font-size: 28px; }
    .section-title { font-size: 32px; }
    .cert-grid { grid-template-columns: repeat(2, 1fr); }
    .footer-grid { grid-template-columns: repeat(2, 1fr); }
    .cases-grid { grid-template-columns: 1fr 1fr; }
    .testimonials-grid { grid-template-columns: 1fr 1fr; }
    .process-steps { flex-wrap: wrap; gap: 12px; }
    .process-connector { display: none; }
    .process-step { max-width: 160px; }
}

/* --- 移动端底部导航基础（桌面隐藏） --- */
.mobile-bottom-nav,
.nav-overlay {
    display: none;
}

/* ============================================
   手机H5移动端适配 (max-width: 768px)
   ============================================ */
@media (max-width: 768px) {
    /* 全局基础 */
    html {
        font-size: 14px;
        -webkit-text-size-adjust: 100%;
        -webkit-tap-highlight-color: transparent;
    }

    body {
        padding-bottom: calc(60px + env(safe-area-inset-bottom, 0px));
        -webkit-overflow-scrolling: touch;
    }

    .container {
        padding: 0 16px;
    }

    /* --- 移动端底部导航 --- */
    .mobile-bottom-nav {
        display: flex;
        position: fixed;
        bottom: 0;
        left: 0;
        right: 0;
        z-index: 1000;
        background: rgba(255,255,255,0.97);
        backdrop-filter: blur(20px);
        -webkit-backdrop-filter: blur(20px);
        border-top: 1px solid rgba(0,0,0,0.06);
        padding: 6px 0 calc(6px + env(safe-area-inset-bottom, 0px));
        box-shadow: 0 -2px 16px rgba(0,0,0,0.06);
    }

    .mbnav-item {
        flex: 1;
        display: flex;
        flex-direction: column;
        align-items: center;
        gap: 2px;
        padding: 6px 0;
        color: var(--gray-400);
        font-size: 10px;
        transition: all 0.25s ease;
        position: relative;
    }

    .mbnav-item svg {
        width: 22px;
        height: 22px;
        transition: all 0.25s ease;
    }

    .mbnav-item span {
        font-weight: 500;
        letter-spacing: 0.5px;
    }

    .mbnav-item.active {
        color: var(--primary);
    }

    .mbnav-item.active svg {
        transform: scale(1.1);
    }

    .mbnav-item.active::before {
        content: '';
        position: absolute;
        top: 0;
        left: 50%;
        transform: translateX(-50%);
        width: 20px;
        height: 2px;
        background: var(--primary);
        border-radius: 0 0 2px 2px;
    }

    /* --- 遮罩层 --- */
    .nav-overlay {
        display: block;
        position: fixed;
        inset: 0;
        background: rgba(0,0,0,0.4);
        z-index: 1001;
        opacity: 0;
        visibility: hidden;
        transition: all 0.35s ease;
        -webkit-backdrop-filter: blur(2px);
        backdrop-filter: blur(2px);
    }

    .nav-overlay.active {
        opacity: 1;
        visibility: visible;
    }

    /* --- 顶部导航 --- */
    .scroll-indicator { display: none; }

    .navbar {
        padding: 10px 0;
    }

    .navbar.scrolled {
        padding: 8px 0;
        background: rgba(255,255,255,0.98);
    }

    .nav-container {
        padding: 0 16px;
    }

    .logo-text {
        font-size: 17px;
    }

    .nav-toggle {
        display: flex;
        gap: 5px;
    }

    .nav-toggle span {
        width: 22px;
        height: 2px;
        border-radius: 1px;
    }

    .nav-menu {
        position: fixed;
        top: 0;
        right: -82vw;
        width: 82vw;
        max-width: 360px;
        height: 100vh;
        height: 100dvh;
        background: var(--white);
        flex-direction: column;
        align-items: stretch;
        padding: 70px 20px 40px;
        gap: 0;
        box-shadow: -8px 0 40px rgba(0,0,0,0.12);
        transition: right 0.35s cubic-bezier(0.4, 0, 0.2, 1);
        z-index: 1002;
        overflow-y: auto;
    }

    .nav-menu.active {
        right: 0;
    }

    .nav-menu .nav-link {
        color: var(--gray-600);
        width: 100%;
        padding: 16px 16px;
        font-size: 16px;
        border-radius: 10px;
        display: flex;
        align-items: center;
        gap: 12px;
    }

    .nav-menu .nav-link::before {
        content: '';
        width: 4px;
        height: 4px;
        border-radius: 50%;
        background: var(--gray-300);
        flex-shrink: 0;
        transition: all 0.25s ease;
    }

    .nav-menu .nav-link:hover,
    .nav-menu .nav-link.active {
        color: var(--primary);
        background: rgba(45,91,227,0.06);
    }

    .nav-menu .nav-link.active::before {
        background: var(--primary);
        width: 6px;
        height: 6px;
    }

    /* --- Hero --- */
    .hero {
        min-height: 100vh;
        min-height: 100dvh;
        padding-top: 60px;
    }

    .hero-content {
        padding: 0 16px;
    }

    .hero-badge {
        font-size: 11px;
        padding: 6px 16px;
        letter-spacing: 1px;
        margin-bottom: 20px;
    }

    .hero-title {
        font-size: 28px;
        line-height: 1.25;
        margin-bottom: 16px;
    }

    .title-accent {
        display: block;
        font-size: 32px;
    }

    .title-sub {
        font-size: 18px;
        display: block;
        margin-top: 4px;
    }

    .hero-desc {
        font-size: 14px;
        margin-bottom: 28px;
        line-height: 1.7;
    }

    .hero-buttons {
        flex-direction: column;
        align-items: stretch;
        gap: 12px;
        margin-bottom: 32px;
        padding: 0 8px;
    }

    .btn {
        padding: 13px 28px;
        font-size: 15px;
        border-radius: 12px;
        text-align: center;
        justify-content: center;
    }

    .hero-stats {
        display: grid;
        grid-template-columns: 1fr 1fr;
        gap: 16px;
        padding: 20px;
        border-radius: 16px;
    }

    .stat-item {
        text-align: center;
        padding: 8px 0;
    }

    .stat-num {
        font-size: 28px;
    }

    .stat-suffix {
        font-size: 16px;
    }

    .stat-label {
        font-size: 11px;
        margin-top: 2px;
    }

    .stat-divider {
        display: none;
    }

    /* --- Section 通用 --- */
    .section {
        padding: 56px 0;
    }

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

    .section-tag {
        font-size: 11px;
        padding: 5px 16px;
        letter-spacing: 2px;
    }

    .section-title {
        font-size: 24px;
        margin-bottom: 12px;
    }

    .section-line {
        width: 48px;
        height: 3px;
        margin-bottom: 14px;
    }

    .section-desc {
        font-size: 14px;
        line-height: 1.7;
    }

    /* --- 关于我们 --- */
    .about-grid {
        grid-template-columns: 1fr;
        gap: 32px;
    }

    .about-img-wrapper {
        max-width: 320px;
        margin: 0 auto;
    }

    .about-float-card {
        padding: 10px 16px;
        font-size: 12px;
        box-shadow: 0 4px 16px rgba(0,0,0,0.1);
    }

    .about-float-card.card-1 {
        top: -12px;
        right: -8px;
    }

    .about-float-card.card-2 {
        bottom: -12px;
        left: -8px;
    }

    .float-icon {
        font-size: 20px;
    }

    .about-subtitle {
        font-size: 20px;
        margin-bottom: 14px;
    }

    .about-text {
        font-size: 14px;
        line-height: 1.8;
    }

    .about-features {
        grid-template-columns: 1fr;
        gap: 12px;
        margin-top: 24px;
    }

    .about-feature {
        padding: 14px;
        gap: 12px;
    }

    .feature-icon {
        width: 40px;
        height: 40px;
        border-radius: 10px;
    }

    .feature-icon svg {
        width: 20px;
        height: 20px;
    }

    .about-feature h4 {
        font-size: 14px;
    }

    .about-feature p {
        font-size: 12px;
    }

    .about-info-grid {
        grid-template-columns: 1fr;
        gap: 12px;
        padding: 16px;
    }

    /* --- 核心业务 --- */
    .business-grid {
        grid-template-columns: 1fr;
        gap: 16px;
    }

    .business-card {
        padding: 28px 20px;
        border-radius: 16px;
    }

    .business-card h3 {
        font-size: 18px;
        margin-bottom: 10px;
    }

    .business-card > p {
        font-size: 14px;
        line-height: 1.7;
        margin-bottom: 16px;
    }

    .business-icon {
        width: 52px;
        height: 52px;
        margin-bottom: 18px;
    }

    .business-tags {
        gap: 6px;
    }

    .business-tags li {
        padding: 4px 12px;
        font-size: 12px;
    }

    /* --- 资质证书 --- */
    .certificates {
        padding: 56px 0 48px;
    }

    .cert-grid {
        grid-template-columns: 1fr 1fr;
        gap: 14px;
    }

    .cert-frame {
        padding: 20px 12px 14px;
        border-radius: 10px;
        border-width: 1.5px;
    }

    .cert-seal svg {
        width: 48px;
        height: 48px;
    }

    .cert-header {
        font-size: 9px;
        letter-spacing: 1px;
        margin-bottom: 6px;
    }

    .cert-type {
        font-size: 13px;
        margin-bottom: 10px;
        padding-bottom: 8px;
    }

    .cert-body p {
        font-size: 11px;
        line-height: 1.6;
    }

    .cert-company {
        font-size: 11px !important;
    }

    .cert-footer {
        margin-top: 8px;
        padding-top: 6px;
        font-size: 9px;
    }

    .cert-card h4 {
        font-size: 13px;
    }

    .cert-card p {
        font-size: 11px;
    }

    /* --- 产品展示 --- */
    .products-grid {
        grid-template-columns: 1fr;
        gap: 16px;
    }

    .product-card {
        border-radius: 16px;
    }

    .product-preview {
        padding: 20px 20px 0;
    }

    .product-badge {
        top: 14px;
        right: 14px;
        padding: 4px 12px;
        font-size: 11px;
    }

    .product-info {
        padding: 16px 20px 24px;
    }

    .product-info h3 {
        font-size: 17px;
        margin-bottom: 8px;
    }

    .product-info p {
        font-size: 13px;
        line-height: 1.7;
        margin-bottom: 12px;
    }

    .product-tags {
        gap: 6px;
    }

    .product-tags span {
        padding: 4px 12px;
        font-size: 11px;
    }

    /* --- 合作伙伴 --- */
    .partners {
        padding: 48px 0;
    }

    .partner-item {
        padding: 12px 24px;
        font-size: 14px;
    }

    /* --- 联系我们 --- */
    .contact-grid {
        grid-template-columns: 1fr;
        gap: 28px;
    }

    .qr-showcase {
        padding: 28px 16px;
        margin-bottom: 8px;
    }

    .qr-title {
        font-size: 18px;
        margin-bottom: 20px;
    }

    .qr-grid {
        gap: 20px;
    }

    .qr-item img {
        width: 110px;
        height: 110px;
        padding: 6px;
    }

    .qr-item span {
        font-size: 12px;
    }

    .contact-item {
        padding: 16px;
        border-radius: 12px;
        margin-bottom: 10px;
        gap: 14px;
    }

    .contact-icon {
        width: 42px;
        height: 42px;
        border-radius: 10px;
    }

    .contact-icon svg {
        width: 20px;
        height: 20px;
    }

    .contact-item h4 {
        font-size: 14px;
    }

    .contact-item p {
        font-size: 13px;
    }

    .contact-form-wrapper {
        padding: 24px 20px;
        border-radius: 16px;
    }

    .form-row {
        grid-template-columns: 1fr;
        gap: 0;
    }

    .form-group {
        margin-bottom: 16px;
    }

    .form-group label {
        font-size: 13px;
        margin-bottom: 6px;
    }

    .form-group input,
    .form-group textarea {
        padding: 11px 14px;
        font-size: 15px;
        border-radius: 10px;
    }

    .form-group textarea {
        min-height: 100px;
    }

    .btn-full {
        padding: 14px;
        font-size: 15px;
        border-radius: 12px;
    }

    /* --- Footer --- */
    .footer {
        padding: 40px 0 0;
        padding-bottom: calc(60px + env(safe-area-inset-bottom, 0px));
    }

    .footer-grid {
        grid-template-columns: 1fr;
        gap: 28px;
        padding-bottom: 32px;
    }

    .footer-logo span {
        font-size: 16px;
    }

    .footer-desc {
        font-size: 13px;
    }

    .footer-links h4 {
        font-size: 14px;
        margin-bottom: 14px;
    }

    .footer-links ul li {
        font-size: 13px;
        margin-bottom: 8px;
    }

    .footer-bottom {
        padding: 16px 0;
        font-size: 11px;
    }

    .footer-bottom p {
        line-height: 1.6;
    }

    /* --- 回到顶部 --- */
    .back-to-top {
        bottom: calc(72px + env(safe-area-inset-bottom, 0px));
        right: 16px;
        width: 42px;
        height: 42px;
    }

    /* --- 发展历程 移动端 --- */
    .timeline {
        padding-left: 32px;
    }

    .timeline::before {
        left: 10px;
    }

    .timeline-dot {
        left: -29px;
        width: 10px;
        height: 10px;
    }

    .timeline-item {
        margin-bottom: 24px;
        padding-left: 20px;
    }

    .timeline-content {
        padding: 16px 18px;
    }

    .timeline-year {
        font-size: 12px;
    }

    .timeline-content h4 {
        font-size: 15px;
    }

    .timeline-content p {
        font-size: 13px;
    }

    /* --- 技术实力 移动端 --- */
    .tech-grid {
        grid-template-columns: 1fr 1fr;
        gap: 12px;
    }

    .tech-card {
        padding: 20px 16px;
    }

    .tech-icon {
        width: 42px;
        height: 42px;
        margin-bottom: 12px;
    }

    .tech-icon svg {
        width: 22px;
        height: 22px;
    }

    .tech-card h4 {
        font-size: 14px;
        margin-bottom: 10px;
    }

    .tech-tags span {
        padding: 3px 8px;
        font-size: 11px;
    }

    /* --- 成功案例 移动端 --- */
    .cases-grid {
        grid-template-columns: 1fr;
        gap: 16px;
    }

    .case-info {
        padding: 16px 20px 20px;
    }

    .case-info h4 {
        font-size: 16px;
    }

    .case-info > p {
        font-size: 13px;
        margin-bottom: 12px;
    }

    .case-metrics {
        gap: 8px;
        padding-top: 12px;
    }

    .metric strong {
        font-size: 16px;
    }

    .metric span {
        font-size: 10px;
    }

    /* --- 服务流程 移动端 --- */
    .process-steps {
        flex-direction: column;
        align-items: center;
        gap: 0;
    }

    .process-step {
        max-width: 280px;
        margin-bottom: 8px;
    }

    .step-number {
        font-size: 24px;
        margin-bottom: 8px;
    }

    .step-icon {
        width: 48px;
        height: 48px;
        margin-bottom: 10px;
    }

    .process-connector {
        width: 2px;
        height: 20px;
        margin: 0;
        background: linear-gradient(180deg, rgba(45,91,227,0.3), rgba(45,91,227,0.1));
    }

    .process-step h4 {
        font-size: 14px;
    }

    .process-step p {
        font-size: 12px;
    }

    /* --- 客户评价 移动端 --- */
    .testimonials-grid {
        grid-template-columns: 1fr;
        gap: 14px;
    }

    .testimonial-card {
        padding: 22px 18px;
    }

    .testimonial-stars {
        font-size: 14px;
        margin-bottom: 10px;
    }

    .testimonial-text {
        font-size: 13px;
        margin-bottom: 16px;
    }

    /* --- 常见问题 移动端 --- */
    .faq-question {
        padding: 14px 16px;
    }

    .faq-question h4 {
        font-size: 14px;
    }

    .faq-toggle {
        width: 24px;
        height: 24px;
    }

    .faq-toggle svg {
        width: 14px;
        height: 14px;
    }

    .faq-answer p {
        padding: 0 16px 16px;
        font-size: 13px;
    }
}

/* --- 触摸优化 (仅触屏设备) --- */
@media (hover: none) and (pointer: coarse) {
    .business-card:hover {
        transform: none;
        box-shadow: none;
    }

    .business-card:active {
        transform: scale(0.98);
        box-shadow: var(--shadow-md);
    }

    .business-card:hover .business-card-glow {
        opacity: 0;
    }

    .business-card:active .business-card-glow {
        opacity: 1;
    }

    .cert-card:hover {
        transform: none;
    }

    .cert-card:active {
        transform: scale(0.97);
    }

    .product-card:hover {
        transform: none;
        box-shadow: none;
        border-color: var(--gray-200);
    }

    .product-card:active {
        transform: scale(0.98);
        box-shadow: var(--shadow-md);
        border-color: transparent;
    }

    .contact-item:hover {
        box-shadow: none;
        transform: none;
    }

    .contact-item:active {
        box-shadow: var(--shadow-md);
        transform: scale(0.98);
    }

    .about-feature:hover {
        box-shadow: none;
        transform: none;
    }

    .about-feature:active {
        box-shadow: var(--shadow-sm);
        transform: scale(0.98);
    }

    .tech-card:hover {
        transform: none;
    }

    .tech-card:active {
        transform: scale(0.98);
        box-shadow: var(--shadow-sm);
    }

    .case-card:hover {
        transform: none;
        box-shadow: none;
        border-color: var(--gray-200);
    }

    .case-card:active {
        transform: scale(0.98);
        box-shadow: var(--shadow-md);
    }

    .testimonial-card:hover {
        transform: none;
    }

    .testimonial-card:active {
        transform: scale(0.98);
        box-shadow: var(--shadow-sm);
    }

    .timeline-item:hover .timeline-dot {
        transform: none;
    }
}

/* --- 超小屏幕 (<=375px) --- */
@media (max-width: 375px) {
    html { font-size: 13px; }

    .hero-title { font-size: 24px; }
    .title-accent { font-size: 28px; }
    .title-sub { font-size: 16px; }
    .section-title { font-size: 22px; }

    .hero-stats {
        gap: 12px;
        padding: 16px;
    }

    .stat-num { font-size: 24px; }
    .stat-suffix { font-size: 14px; }

    .cert-grid { gap: 10px; }
    .cert-type { font-size: 12px; }
    .cert-body p { font-size: 10px; }

    .mbnav-item span { font-size: 9px; }
    .mbnav-item svg { width: 20px; height: 20px; }

    .tech-grid { grid-template-columns: 1fr; }
    .process-step { max-width: 260px; }
}

/* --- 横屏手机 --- */
@media (max-width: 768px) and (orientation: landscape) {
    .hero {
        min-height: auto;
        padding: 80px 0 40px;
    }

    .hero-content {
        max-width: 600px;
    }

    .hero-stats {
        grid-template-columns: repeat(4, 1fr);
    }

    .stat-divider { display: none; }

    .mobile-bottom-nav {
        padding-bottom: 6px;
    }
}

/* --- 刘海屏/安全区域 --- */
@supports (padding-top: env(safe-area-inset-top)) {
    @media (max-width: 768px) {
        .navbar {
            padding-top: calc(10px + env(safe-area-inset-top));
        }

        .navbar.scrolled {
            padding-top: calc(8px + env(safe-area-inset-top));
        }

        .mobile-bottom-nav {
            padding-bottom: calc(6px + env(safe-area-inset-bottom));
        }

        body {
            padding-bottom: calc(60px + env(safe-area-inset-bottom));
        }
    }
}

/* --- 减少运动偏好 --- */
@media (prefers-reduced-motion: reduce) {
    .about-float-card {
        animation: none !important;
    }

    .partners-scroll {
        animation-duration: 60s !important;
    }

    [data-animate] {
        opacity: 1 !important;
        transform: none !important;
        transition: none !important;
    }
}