/* ===========================
   武汉正义科技官网 - 精致优化版
   =========================== */

:root {
    --primary: #2563eb;
    --primary-dark: #1e40af;
    --primary-light: #3b82f6;
    --ai-color: #0ea5e9;
    --success: #16a34a;
    --text-dark: #0f172a;
    --text-gray: #64748b;
    --text-light: #94a3b8;
    --bg-light: #f8fafc;
    --white: #ffffff;
    --border: #e2e8f0;
}

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

body {
    font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', 'Microsoft YaHei', sans-serif;
    color: var(--text-dark);
    line-height: 1.7;
    background: var(--white);
}

html {
    scroll-behavior: smooth;
}

/* ========== 导航栏 ========== */
.navbar {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    padding: 1.25rem 0;
    background: rgba(255, 255, 255, 0.98);
    backdrop-filter: blur(12px);
    border-bottom: 1px solid rgba(226, 232, 240, 0.8);
    z-index: 1000;
    transition: all 0.3s ease;
}

.navbar .container {
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.navbar-brand {
    display: flex;
    align-items: baseline;
    gap: 0.75rem;
    text-decoration: none;
    transition: opacity 0.2s;
}

.navbar-brand:hover {
    opacity: 0.85;
}

.brand-name {
    font-size: 1.5rem;
    font-weight: 800;
    color: var(--text-dark);
}

.brand-domain {
    font-size: 0.95rem;
    font-weight: 500;
    color: var(--text-light);
}

.navbar-contact {
    display: flex;
    align-items: center;
    gap: 1rem;
}

.open-platform-btn,
.contact-phone,
.contact-email {
    display: flex;
    align-items: center;
    gap: 0.6rem;
    padding: 0.85rem 1.75rem;
    border-radius: 0.875rem;
    text-decoration: none;
    font-weight: 600;
    font-size: 0.95rem;
    transition: all 0.25s cubic-bezier(0.4, 0, 0.2, 1);
}

.open-platform-btn {
    background: #fef3c7;
    color: #92400e;
    box-shadow: 0 2px 8px rgba(251, 191, 36, 0.2);
    border: 1px solid #fde68a;
}

.open-platform-btn:hover {
    background: #fde68a;
    color: #78350f;
    transform: translateY(-2px);
    box-shadow: 0 6px 16px rgba(251, 191, 36, 0.3);
}

.open-platform-btn i {
    font-size: 1rem;
}

.contact-phone {
    background: var(--primary);
    color: white;
    box-shadow: 0 2px 8px rgba(37, 99, 235, 0.25);
}

.contact-phone:hover {
    background: var(--primary-dark);
    color: white;
    transform: translateY(-2px);
    box-shadow: 0 6px 16px rgba(37, 99, 235, 0.35);
}

.contact-email {
    background: var(--bg-light);
    color: var(--text-dark);
}

.contact-email:hover {
    background: var(--text-dark);
    color: white;
    transform: translateY(-2px);
    box-shadow: 0 4px 12px rgba(0, 0, 0, 0.15);
}

/* ========== Hero Section ========== */
.hero-section {
    height: 500px;
    margin-top: 80px;
    background: var(--white);
    position: relative;
    overflow: hidden;
}

/* 动态背景 */
.hero-bg {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    z-index: 0;
}

.bg-grid {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background-image:
        linear-gradient(rgba(37, 99, 235, 0.02) 1px, transparent 1px),
        linear-gradient(90deg, rgba(37, 99, 235, 0.02) 1px, transparent 1px);
    background-size: 50px 50px;
    opacity: 0.5;
}

.bg-shape {
    position: absolute;
    border-radius: 50%;
    opacity: 0.05;
    filter: blur(40px);
    animation: float-shape 25s ease-in-out infinite;
}

.shape-1 {
    width: 450px;
    height: 450px;
    background: var(--primary);
    top: -180px;
    left: -120px;
    animation-duration: 28s;
}

.shape-2 {
    width: 380px;
    height: 380px;
    background: var(--ai-color);
    top: -80px;
    right: -100px;
    animation-duration: 32s;
    animation-delay: -8s;
}

.shape-3 {
    width: 320px;
    height: 320px;
    background: var(--primary-light);
    bottom: -120px;
    left: 45%;
    animation-duration: 30s;
    animation-delay: -15s;
}

@keyframes float-shape {

    0%,
    100% {
        transform: translate(0, 0) scale(1) rotate(0deg);
    }

    33% {
        transform: translate(25px, -25px) scale(1.08) rotate(5deg);
    }

    66% {
        transform: translate(-20px, 20px) scale(0.92) rotate(-5deg);
    }
}

.hero-section .container {
    position: relative;
    z-index: 1;
}

/* Hero 内容 */
.hero-label {
    display: inline-flex;
    align-items: center;
    gap: 0.5rem;
    padding: 0.6rem 1.5rem;
    background: var(--bg-light);
    color: var(--text-gray);
    border-radius: 50px;
    font-size: 0.9rem;
    font-weight: 600;
    margin-bottom: 1.5rem;
    border: 1px solid var(--border);
}

.hero-label i {
    font-size: 0.95rem;
    color: var(--primary);
}

.hero-title {
    font-size: 3.75rem;
    font-weight: 900;
    line-height: 1.15;
    color: var(--text-dark);
    letter-spacing: -0.025em;
    margin-bottom: 1.5rem;
}

.gradient-text {
    background: linear-gradient(135deg, var(--primary) 0%, var(--ai-color) 100%);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.hero-desc {
    font-size: 1.1rem;
    color: var(--text-gray);
    line-height: 1.8;
    margin-bottom: 2rem;
}

.hero-contact {
    display: flex;
    gap: 1rem;
}

.hero-btn {
    display: flex;
    align-items: center;
    gap: 0.65rem;
    padding: 1rem 1.75rem;
    border-radius: 0.875rem;
    text-decoration: none;
    font-weight: 600;
    font-size: 1rem;
    transition: all 0.25s cubic-bezier(0.4, 0, 0.2, 1);
}

.hero-btn.btn-primary {
    background: var(--primary);
    color: white;
    box-shadow: 0 4px 12px rgba(37, 99, 235, 0.3);
}

.hero-btn.btn-primary:hover {
    background: var(--primary-dark);
    color: white;
    transform: translateY(-3px);
    box-shadow: 0 8px 20px rgba(37, 99, 235, 0.4);
}

.hero-btn.btn-secondary {
    background: var(--bg-light);
    color: var(--text-dark);
}

.hero-btn.btn-secondary:hover {
    background: var(--text-dark);
    color: white;
    transform: translateY(-3px);
    box-shadow: 0 6px 16px rgba(0, 0, 0, 0.15);
}

/* Hero 数据卡片 */
.hero-stats-box {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: 1rem;
}

.stat-card {
    background: white;
    padding: 2rem 1.75rem;
    border-radius: 1.25rem;
    text-align: center;
    box-shadow: 0 4px 16px rgba(0, 0, 0, 0.06);
    transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
    border: 2px solid var(--bg-light);
    position: relative;
    overflow: hidden;
}

.stat-card::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    height: 3px;
    background: linear-gradient(90deg, var(--primary) 0%, var(--ai-color) 100%);
    transform: scaleX(0);
    transition: transform 0.3s ease;
}

.stat-card:hover::before {
    transform: scaleX(1);
}

.stat-card:hover {
    transform: translateY(-6px) scale(1.02);
    box-shadow: 0 12px 32px rgba(0, 0, 0, 0.12);
    border-color: var(--primary);
}

.stat-icon {
    font-size: 1.75rem;
    color: var(--primary);
    margin-bottom: 0.75rem;
    opacity: 0.3;
}

.stat-number {
    font-size: 2.75rem;
    font-weight: 900;
    background: linear-gradient(135deg, var(--primary) 0%, var(--ai-color) 100%);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
    line-height: 1;
    margin-bottom: 0.65rem;
}

.stat-label {
    font-size: 0.9rem;
    color: var(--text-gray);
    font-weight: 600;
}

/* ========== Solutions Section ========== */
.solutions-section {
    background: var(--bg-light);
    position: relative;
}

.solutions-wrapper {
    padding: 5rem 0;
}

.section-header {
    margin-bottom: 3.5rem;
}

.section-badge {
    display: inline-flex;
    align-items: center;
    gap: 0.6rem;
    padding: 0.6rem 1.5rem;
    background: white;
    color: var(--primary);
    border-radius: 50px;
    font-size: 0.85rem;
    font-weight: 700;
    box-shadow: 0 3px 12px rgba(0, 0, 0, 0.08);
    margin-bottom: 1.5rem;
}

.section-badge i {
    font-size: 1.05rem;
}

.section-title {
    font-size: 2.75rem;
    font-weight: 900;
    color: var(--text-dark);
    margin-bottom: 1rem;
    line-height: 1.2;
    letter-spacing: -0.02em;
}

.section-desc {
    font-size: 1.1rem;
    color: var(--text-gray);
    margin: 0;
    max-width: 700px;
    margin: 0 auto;
    line-height: 1.7;
}

/* 解决方案卡片 */
.solution-card {
    background: white;
    padding: 2.25rem;
    border-radius: 1.75rem;
    height: 100%;
    transition: all 0.4s cubic-bezier(0.4, 0, 0.2, 1);
    box-shadow: 0 4px 16px rgba(0, 0, 0, 0.05);
    border: 2px solid transparent;
    position: relative;
    overflow: hidden;
}

.solution-card::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    width: 4px;
    height: 0;
    background: linear-gradient(180deg, var(--primary) 0%, var(--ai-color) 100%);
    transition: height 0.4s ease;
}

.solution-card:hover::before {
    height: 100%;
}

.solution-card:hover {
    transform: translateY(-10px);
    box-shadow: 0 20px 50px rgba(0, 0, 0, 0.12);
    border-color: var(--primary);
}

.solution-card.featured {
    border-color: var(--primary);
    box-shadow: 0 8px 28px rgba(37, 99, 235, 0.15);
    background: linear-gradient(135deg, #ffffff 0%, #f8fafc 100%);
}

.solution-card.featured::before {
    height: 100%;
}

.solution-card.featured:hover {
    box-shadow: 0 24px 60px rgba(37, 99, 235, 0.25);
}

.featured-tag {
    position: absolute;
    top: 1.25rem;
    right: 1.25rem;
    padding: 0.35rem 0.85rem;
    background: var(--primary);
    color: white;
    border-radius: 50px;
    font-size: 0.75rem;
    font-weight: 700;
}

.solution-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 1.5rem;
}

.solution-icon {
    width: 65px;
    height: 65px;
    background: linear-gradient(135deg, #eff6ff 0%, #dbeafe 100%);
    border-radius: 1.25rem;
    display: flex;
    align-items: center;
    justify-content: center;
}

.solution-icon i {
    font-size: 2rem;
    color: var(--primary);
}

.solution-badge {
    padding: 0.4rem 1rem;
    background: var(--bg-light);
    color: var(--text-gray);
    border-radius: 50px;
    font-size: 0.75rem;
    font-weight: 700;
    text-transform: uppercase;
    letter-spacing: 0.05em;
}

.solution-title {
    font-size: 1.5rem;
    font-weight: 800;
    color: var(--text-dark);
    margin-bottom: 1.35rem;
    line-height: 1.3;
}

.solution-meta {
    display: flex;
    gap: 1.5rem;
    margin-bottom: 1.65rem;
    padding-bottom: 1.65rem;
    border-bottom: 1px solid var(--border);
}

.meta-item {
    display: flex;
    align-items: center;
    gap: 0.5rem;
    font-size: 0.875rem;
    color: var(--text-gray);
    font-weight: 500;
}

.meta-item i {
    color: var(--primary);
    font-size: 1rem;
}

.solution-features {
    display: flex;
    flex-wrap: wrap;
    gap: 0.6rem;
    margin-bottom: 1.65rem;
}

.solution-features span {
    padding: 0.55rem 1.1rem;
    background: var(--bg-light);
    border-radius: 50px;
    font-size: 0.85rem;
    font-weight: 600;
    color: var(--text-dark);
    transition: all 0.25s ease;
}

.solution-features span:hover {
    background: #eff6ff;
    color: var(--primary);
    transform: translateY(-2px);
}

.solution-result {
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 0.75rem;
    padding: 1.25rem;
    background: linear-gradient(135deg, #f0fdf4 0%, #dcfce7 100%);
    border-radius: 1rem;
    font-weight: 700;
    font-size: 1.05rem;
}

.solution-result i {
    color: var(--success);
    font-size: 1.5rem;
}

.solution-result span {
    color: var(--success);
}

.solutions-footer {
    text-align: center;
    margin-top: 4rem;
    padding-top: 3rem;
    border-top: 2px dashed var(--border);
}

.solutions-footer-text {
    font-size: 1.15rem;
    color: var(--text-gray);
    font-weight: 500;
    margin: 0;
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 0.5rem;
}

.solutions-footer-text i {
    color: var(--primary);
    font-size: 1.2rem;
}

/* ========== Services Section ========== */
.services-section {
    padding: 5rem 0;
    background: white;
}

.service-card {
    background: var(--bg-light);
    border-radius: 2rem;
    height: 100%;
    transition: all 0.4s cubic-bezier(0.4, 0, 0.2, 1);
    overflow: hidden;
    box-shadow: 0 8px 24px rgba(0, 0, 0, 0.06);
    border: 3px solid transparent;
    position: relative;
}

.service-card::after {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    height: 4px;
    opacity: 0;
    transition: opacity 0.3s ease;
}

.service-card:hover::after {
    opacity: 1;
}

.service-card:hover {
    transform: translateY(-10px);
    box-shadow: 0 24px 60px rgba(0, 0, 0, 0.12);
}

.ai-card {
    border-color: var(--ai-color);
}

.ai-card::after {
    background: linear-gradient(90deg, var(--ai-color) 0%, #38bdf8 100%);
}

.ai-card:hover {
    box-shadow: 0 24px 60px rgba(14, 165, 233, 0.2);
}

.dev-card {
    border-color: var(--primary);
}

.dev-card::after {
    background: linear-gradient(90deg, var(--primary) 0%, var(--primary-light) 100%);
}

.dev-card:hover {
    box-shadow: 0 24px 60px rgba(37, 99, 235, 0.2);
}

/* 卡片头部 */
.card-header {
    padding: 2rem 2.25rem 1.75rem;
    background: linear-gradient(135deg, rgba(248, 250, 252, 0.5) 0%, rgba(255, 255, 255, 0.8) 100%);
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.service-badge {
    display: inline-flex;
    align-items: center;
    gap: 0.5rem;
    padding: 0.5rem 1.15rem;
    border-radius: 50px;
    font-size: 0.75rem;
    font-weight: 700;
    text-transform: uppercase;
    letter-spacing: 0.05em;
}

.ai-badge {
    background: linear-gradient(135deg, #e0f2fe 0%, #bae6fd 100%);
    color: var(--ai-color);
}

.dev-badge {
    background: linear-gradient(135deg, #dbeafe 0%, #bfdbfe 100%);
    color: var(--primary);
}

.service-icon {
    width: 75px;
    height: 75px;
    border-radius: 1.5rem;
    display: flex;
    align-items: center;
    justify-content: center;
    box-shadow: 0 8px 24px rgba(0, 0, 0, 0.12);
    position: relative;
    overflow: hidden;
}

.service-icon::before {
    content: '';
    position: absolute;
    top: -50%;
    left: -50%;
    width: 200%;
    height: 200%;
    background: linear-gradient(45deg, transparent, rgba(255, 255, 255, 0.4), transparent);
    transform: rotate(45deg);
    animation: shine 3.5s ease-in-out infinite;
}

@keyframes shine {
    0% {
        transform: translateX(-100%) translateY(-100%) rotate(45deg);
    }

    100% {
        transform: translateX(100%) translateY(100%) rotate(45deg);
    }
}

.ai-card .service-icon {
    background: linear-gradient(135deg, var(--ai-color) 0%, #38bdf8 100%);
}

.dev-card .service-icon {
    background: linear-gradient(135deg, var(--primary) 0%, var(--primary-light) 100%);
}

.service-icon i {
    font-size: 2.75rem;
    color: white;
    position: relative;
    z-index: 1;
}

/* 卡片主体 */
.card-body {
    padding: 1.75rem 2.25rem 2rem;
}

.service-title {
    font-size: 2rem;
    font-weight: 900;
    color: var(--text-dark);
    margin-bottom: 1rem;
    line-height: 1.2;
    letter-spacing: -0.01em;
}

.service-desc {
    font-size: 1rem;
    color: var(--text-gray);
    margin-bottom: 1.75rem;
    line-height: 1.7;
}

/* 服务网格 */
.service-grid {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: 0.75rem;
}

.service-item {
    display: flex;
    flex-direction: column;
    align-items: center;
    text-align: center;
    gap: 0.75rem;
    padding: 1.15rem 1rem;
    background: white;
    border-radius: 1rem;
    transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
    border: 2px solid transparent;
}

.service-item:hover {
    box-shadow: 0 6px 20px rgba(0, 0, 0, 0.1);
    transform: translateY(-4px);
    border-color: var(--border);
}

.item-icon {
    width: 46px;
    height: 46px;
    border-radius: 0.85rem;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 1.35rem;
}

.ai-card .item-icon {
    background: linear-gradient(135deg, #e0f2fe 0%, #bae6fd 100%);
    color: var(--ai-color);
}

.dev-card .item-icon {
    background: linear-gradient(135deg, #dbeafe 0%, #bfdbfe 100%);
    color: var(--primary);
}

.item-content {
    width: 100%;
}

.item-content h6 {
    font-size: 0.95rem;
    font-weight: 700;
    color: var(--text-dark);
    margin-bottom: 0.3rem;
    line-height: 1.3;
}

.item-content p {
    font-size: 0.8rem;
    color: var(--text-gray);
    margin: 0;
    line-height: 1.4;
}

/* 卡片底部 */
.card-footer {
    padding: 1.75rem 2.25rem 2rem;
    background: white;
    border-top: 1px solid rgba(226, 232, 240, 0.5);
}

.tech-stack {
    display: flex;
    align-items: center;
    gap: 1rem;
}

.tech-label {
    font-size: 0.8rem;
    font-weight: 700;
    color: var(--text-gray);
    white-space: nowrap;
}

.tech-items {
    display: flex;
    flex-wrap: wrap;
    gap: 0.6rem;
}

.tech-items span {
    padding: 0.55rem 1.25rem;
    background: white;
    border: 2px solid var(--border);
    border-radius: 50px;
    font-size: 0.825rem;
    font-weight: 700;
    color: var(--text-dark);
    transition: all 0.25s ease;
}

.tech-items span:hover {
    transform: translateY(-2px);
    box-shadow: 0 4px 12px rgba(0, 0, 0, 0.1);
}

.ai-card .tech-items span:hover {
    background: var(--ai-color);
    border-color: var(--ai-color);
    color: white;
}

.dev-card .tech-items span:hover {
    background: var(--primary);
    border-color: var(--primary);
    color: white;
}

/* ========== Footer ========== */
.footer-section {
    background: linear-gradient(180deg, #0f172a 0%, #1e293b 100%);
    padding: 4rem 0 0;
    margin-top: 6rem;
    border-top: 1px solid rgba(255, 255, 255, 0.05);
}

.footer-main {
    padding-bottom: 3rem;
    border-bottom: 1px solid rgba(255, 255, 255, 0.1);
}

.footer-brand {
    margin-bottom: 3rem;
}

.footer-logo {
    display: flex;
    align-items: baseline;
    gap: 0.75rem;
    margin-bottom: 1rem;
}

.logo-text {
    font-size: 1.75rem;
    font-weight: 900;
    color: white;
}

.logo-domain {
    font-size: 1rem;
    font-weight: 500;
    color: rgba(255, 255, 255, 0.5);
}

.footer-slogan {
    font-size: 1rem;
    color: rgba(255, 255, 255, 0.6);
    margin: 0;
    font-weight: 500;
}

.footer-contact-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 2rem;
}

.footer-contact-item {
    display: flex;
    align-items: flex-start;
    gap: 1rem;
    padding: 1.5rem;
    background: rgba(255, 255, 255, 0.03);
    border-radius: 1.25rem;
    transition: all 0.3s ease;
    text-decoration: none;
    border: 1px solid rgba(255, 255, 255, 0.05);
}

.footer-contact-item:hover {
    background: rgba(255, 255, 255, 0.08);
    border-color: var(--primary);
    transform: translateY(-3px);
}

.footer-contact-item i {
    font-size: 1.65rem;
    color: var(--primary);
    flex-shrink: 0;
    margin-top: 0.2rem;
}

.contact-title {
    font-size: 0.8rem;
    color: rgba(255, 255, 255, 0.5);
    margin-bottom: 0.35rem;
    font-weight: 600;
    text-transform: uppercase;
    letter-spacing: 0.05em;
}

.contact-value {
    font-size: 1.05rem;
    color: white;
    font-weight: 700;
}

.footer-keywords {
    padding: 2.5rem 0;
    border-bottom: 1px solid rgba(255, 255, 255, 0.1);
}

.keywords-title {
    font-size: 0.85rem;
    color: rgba(255, 255, 255, 0.5);
    margin-bottom: 1.25rem;
    font-weight: 600;
    text-transform: uppercase;
    letter-spacing: 0.05em;
}

.keywords-list {
    display: flex;
    flex-wrap: wrap;
    gap: 0.75rem;
}

.keywords-list a {
    padding: 0.5rem 1.15rem;
    background: rgba(255, 255, 255, 0.05);
    color: rgba(255, 255, 255, 0.6);
    border-radius: 50px;
    font-size: 0.85rem;
    text-decoration: none;
    transition: all 0.25s ease;
    border: 1px solid rgba(255, 255, 255, 0.1);
}

.keywords-list a:hover {
    background: rgba(37, 99, 235, 0.2);
    color: var(--primary);
    border-color: var(--primary);
    transform: translateY(-2px);
}

.footer-bottom {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 2rem 0;
}

.footer-bottom-left {
    display: flex;
    align-items: center;
    gap: 1rem;
    flex-wrap: wrap;
}

.footer-bottom-left p {
    margin: 0;
    font-size: 0.9rem;
    color: rgba(255, 255, 255, 0.5);
}

.footer-bottom-left .divider {
    color: rgba(255, 255, 255, 0.2);
}

.footer-bottom-left a {
    font-size: 0.9rem;
    color: rgba(255, 255, 255, 0.5);
    text-decoration: none;
    transition: color 0.2s;
}

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

.footer-bottom-right {
    display: flex;
    gap: 1.5rem;
}

.footer-slogan-bottom {
    font-size: 0.95rem;
    color: rgba(255, 255, 255, 0.7);
    margin: 0;
    font-weight: 500;
    font-style: italic;
}

/* ========== Back to Top ========== */
.back-to-top {
    position: fixed;
    bottom: 35px;
    right: 35px;
    width: 56px;
    height: 56px;
    background: var(--primary);
    color: white;
    border: none;
    border-radius: 50%;
    display: none;
    align-items: center;
    justify-content: center;
    cursor: pointer;
    box-shadow: 0 6px 24px rgba(37, 99, 235, 0.35);
    transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
    z-index: 1000;
}

.back-to-top:hover {
    transform: translateY(-6px);
    box-shadow: 0 10px 32px rgba(37, 99, 235, 0.45);
}

.back-to-top.show {
    display: flex;
}

.back-to-top i {
    font-size: 1.5rem;
}

/* ========== 响应式 ========== */
@media (max-width: 992px) {
    .hero-section {
        height: auto;
        min-height: 450px;
        padding: 3.5rem 0;
    }

    .hero-title {
        font-size: 3rem;
    }

    .hero-desc {
        font-size: 1rem;
    }

    .hero-stats-box {
        margin-top: 2.5rem;
    }

    .hero-contact {
        flex-wrap: wrap;
    }

    .hero-btn {
        flex: 1;
        justify-content: center;
    }

    .navbar-contact {
        gap: 0.75rem;
    }

    .open-platform-btn span,
    .contact-phone span,
    .contact-email span {
        display: none;
    }

    .open-platform-btn,
    .contact-phone,
    .contact-email {
        padding: 0.85rem;
        border-radius: 50%;
        width: 48px;
        height: 48px;
        justify-content: center;
    }

    .open-platform-btn i {
        margin: 0;
    }
}

@media (max-width: 768px) {
    .navbar {
        padding: 1.15rem 0;
    }

    .brand-name {
        font-size: 1.35rem;
    }

    .brand-domain {
        font-size: 0.9rem;
    }

    .footer-section {
        margin-top: 4rem;
    }

    .footer-contact-grid {
        grid-template-columns: 1fr;
        gap: 1.25rem;
    }

    .footer-contact-item {
        padding: 1.25rem;
    }

    .footer-keywords {
        padding: 2rem 0;
    }

    .keywords-title {
        font-size: 0.8rem;
        margin-bottom: 1rem;
    }

    .keywords-list {
        gap: 0.6rem;
    }

    .keywords-list a {
        padding: 0.45rem 1rem;
        font-size: 0.8rem;
    }

    .footer-bottom {
        flex-direction: column;
        gap: 1.25rem;
        text-align: center;
    }

    .footer-bottom-left {
        justify-content: center;
    }

    .footer-bottom-right {
        gap: 1.25rem;
    }

    .hero-section {
        height: auto;
        min-height: 400px;
        padding: 3rem 0;
        margin-top: 75px;
    }

    .hero-title {
        font-size: 2.5rem;
    }

    .hero-desc {
        font-size: 0.95rem;
    }

    .hero-contact {
        flex-direction: column;
    }

    .hero-btn {
        width: 100%;
        justify-content: center;
    }

    .hero-stats-box {
        margin-top: 2rem;
    }

    .stat-number {
        font-size: 2.25rem;
    }

    .solutions-wrapper {
        padding: 3.5rem 0;
    }

    .section-title {
        font-size: 2.25rem;
    }

    .section-desc {
        font-size: 1rem;
    }

    .solution-card {
        padding: 1.85rem;
    }

    .solution-title {
        font-size: 1.35rem;
    }

    .solution-meta {
        flex-direction: column;
        gap: 0.65rem;
    }

    .solutions-footer {
        margin-top: 3rem;
        padding-top: 2.25rem;
    }

    .solutions-footer-text {
        font-size: 1rem;
    }

    .services-section {
        padding: 3.5rem 0;
    }

    .card-header,
    .card-body,
    .card-footer {
        padding: 1.65rem;
    }

    .service-title {
        font-size: 1.75rem;
    }

    .service-icon {
        width: 65px;
        height: 65px;
    }

    .service-icon i {
        font-size: 2.35rem;
    }
}

@media (max-width: 576px) {
    .hero-section {
        height: auto;
        padding: 2.5rem 0;
        margin-top: 70px;
    }

    .hero-label {
        font-size: 0.85rem;
        padding: 0.45rem 1.15rem;
        margin-bottom: 1.25rem;
    }

    .hero-title {
        font-size: 2rem;
    }

    .hero-desc {
        font-size: 0.9rem;
    }

    .hero-stats-box {
        gap: 0.85rem;
        margin-top: 1.75rem;
    }

    .stat-card {
        padding: 1.15rem 1rem;
    }

    .stat-number {
        font-size: 1.75rem;
    }

    .stat-label {
        font-size: 0.8rem;
    }

    .solutions-wrapper {
        padding: 2.75rem 0;
    }

    .section-badge {
        padding: 0.5rem 1.25rem;
        font-size: 0.8rem;
    }

    .section-title {
        font-size: 1.85rem;
    }

    .section-desc {
        font-size: 0.9rem;
    }

    .solution-card {
        padding: 1.65rem;
    }

    .solution-icon {
        width: 55px;
        height: 55px;
    }

    .solution-icon i {
        font-size: 1.65rem;
    }

    .solution-title {
        font-size: 1.2rem;
    }

    .solution-meta {
        flex-direction: column;
        gap: 0.6rem;
    }

    .meta-item {
        font-size: 0.8rem;
    }

    .solution-features span {
        font-size: 0.75rem;
        padding: 0.45rem 0.85rem;
    }

    .solution-result {
        font-size: 0.9rem;
        padding: 1rem;
    }

    .solution-result i {
        font-size: 1.25rem;
    }

    .solutions-footer {
        margin-top: 2.25rem;
        padding-top: 1.75rem;
    }

    .solutions-footer-text {
        font-size: 0.9rem;
        flex-direction: column;
        gap: 0.35rem;
    }

    .services-section {
        padding: 2.75rem 0;
    }

    .card-header,
    .card-body,
    .card-footer {
        padding: 1.4rem;
    }

    .service-icon {
        width: 58px;
        height: 58px;
    }

    .service-icon i {
        font-size: 2.15rem;
    }

    .service-title {
        font-size: 1.6rem;
    }

    .service-grid {
        grid-template-columns: 1fr;
        gap: 0.7rem;
    }

    .service-item {
        padding: 1rem;
    }

    .item-icon {
        width: 42px;
        height: 42px;
        font-size: 1.25rem;
    }

    .item-content h6 {
        font-size: 0.9rem;
    }

    .item-content p {
        font-size: 0.75rem;
    }

    .tech-stack {
        flex-direction: column;
        align-items: flex-start;
        gap: 0.75rem;
    }

    .tech-items span {
        padding: 0.5rem 1.1rem;
        font-size: 0.75rem;
    }
}

/* ========== 动画 ========== */
@keyframes fadeInUp {
    from {
        opacity: 0;
        transform: translateY(30px);
    }

    to {
        opacity: 1;
        transform: translateY(0);
    }
}

.hero-content>* {
    animation: fadeInUp 0.8s ease-out backwards;
}

.hero-content>*:nth-child(1) {
    animation-delay: 0.1s;
}

.hero-content>*:nth-child(2) {
    animation-delay: 0.25s;
}

.hero-content>*:nth-child(3) {
    animation-delay: 0.4s;
}

.hero-content>*:nth-child(4) {
    animation-delay: 0.55s;
}

.hero-stats-box {
    animation: fadeInUp 0.8s ease-out backwards 0.3s;
}

.solution-card,
.service-card {
    animation: fadeInUp 0.8s ease-out backwards;
}

.solution-card:nth-child(1) {
    animation-delay: 0.15s;
}

.solution-card:nth-child(2) {
    animation-delay: 0.3s;
}

.solution-card:nth-child(3) {
    animation-delay: 0.45s;
}