/* ============================================
   汇智理咨询 官网样式表
   设计参考：IBM / 麦肯锡 / 凯捷
   配色：深蓝主色 + 青蓝点缀，专业沉稳
   ============================================ */

/* ---------- 基础变量 ---------- */
:root {
    /* 主色 */
    --color-primary: #1E40AF;       /* 品牌蓝 */
    --color-primary-dark: #172554;  /* 深蓝 */
    --color-accent: #3B82F6;        /* 亮蓝 */
    --color-cyan: #60A5FA;          /* 浅蓝（原青色已替换） */

    /* 中性色 */
    --color-dark: #0A1F44;          /* 深蓝背景 */
    --color-dark-2: #0D2B5C;        /* 次深蓝背景 */
    --color-bg: #FFFFFF;            /* 主背景 */
    --color-bg-alt: #F8FAFC;        /* 浅灰背景 */
    --color-bg-alt2: #F1F5F9;       /* 更浅灰 */

    /* 文字 */
    --color-text: #1E293B;          /* 主文字 */
    --color-text-medium: #475569;   /* 次文字 */
    --color-text-light: #94A3B8;    /* 浅文字 */
    --color-text-on-dark: #E2E8F0;  /* 深底文字 */
    --color-text-on-dark-light: #94A3B8; /* 深底浅文字 */

    /* 边框 */
    --color-border: #E2E8F0;
    --color-border-dark: rgba(255,255,255,0.08);

    /* 渐变 */
    --gradient-primary: linear-gradient(135deg, #1E3A8A 0%, #3B82F6 100%);
    --gradient-hero: radial-gradient(circle at 20% 50%, rgba(30,58,138,0.2) 0%, transparent 50%),
                     radial-gradient(circle at 80% 30%, rgba(59,130,246,0.15) 0%, transparent 50%);

    /* 阴影 */
    --shadow-sm: 0 1px 3px rgba(0,0,0,0.06);
    --shadow-md: 0 4px 20px rgba(0,0,0,0.08);
    --shadow-lg: 0 12px 40px rgba(0,0,0,0.12);
    --shadow-xl: 0 24px 60px rgba(0,0,0,0.16);
    --shadow-blue: 0 8px 30px rgba(30,64,175,0.25);

    /* 间距 */
    --container-max: 1200px;
    --radius-sm: 8px;
    --radius-md: 12px;
    --radius-lg: 20px;
    --radius-xl: 28px;

    /* 过渡 */
    --transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
    --transition-slow: all 0.5s cubic-bezier(0.4, 0, 0.2, 1);
}

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

html {
    scroll-behavior: smooth;
    font-size: 16px;
}

body {
    font-family: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', 'PingFang SC', 'Microsoft YaHei', sans-serif;
    color: var(--color-text);
    background: var(--color-bg);
    line-height: 1.7;
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
    overflow-x: hidden;
}

a {
    text-decoration: none;
    color: inherit;
}

ul {
    list-style: none;
}

img {
    max-width: 100%;
    display: block;
}

/* ---------- 通用容器 ---------- */
.container {
    max-width: var(--container-max);
    margin: 0 auto;
    padding: 0 24px;
}

/* ---------- 通用按钮 ---------- */
.btn {
    display: inline-flex;
    align-items: center;
    gap: 8px;
    padding: 14px 28px;
    border-radius: var(--radius-sm);
    font-size: 15px;
    font-weight: 600;
    cursor: pointer;
    transition: var(--transition);
    white-space: nowrap;
    border: none;
    font-family: inherit;
}

.btn-primary {
    background: var(--color-primary);
    color: #fff;
    box-shadow: var(--shadow-blue);
}

.btn-primary:hover {
    background: var(--color-primary-dark);
    transform: translateY(-2px);
    box-shadow: 0 12px 40px rgba(30,64,175,0.35);
}

.btn-ghost {
    background: transparent;
    color: var(--color-text);
    border: 1.5px solid var(--color-border);
}

.btn-ghost:hover {
    border-color: var(--color-primary);
    color: var(--color-primary);
    background: rgba(30,64,175,0.04);
}

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

/* ---------- 渐变文字 ---------- */
.gradient-text {
    background: var(--gradient-primary);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

/* ---------- 通用区块标题 ---------- */
.section-header {
    text-align: center;
    max-width: 680px;
    margin: 0 auto 64px;
}

.section-tag {
    display: inline-block;
    padding: 6px 16px;
    background: rgba(30,64,175,0.08);
    color: var(--color-primary);
    border-radius: 20px;
    font-size: 13px;
    font-weight: 600;
    letter-spacing: 0.5px;
    margin-bottom: 20px;
}

.section-tag.light {
    background: rgba(255,255,255,0.12);
    color: #fff;
}

.section-title {
    font-size: 40px;
    font-weight: 800;
    color: var(--color-text);
    letter-spacing: -0.5px;
    line-height: 1.3;
}

.section-desc {
    margin-top: 16px;
    font-size: 17px;
    color: var(--color-text-medium);
    line-height: 1.7;
}

/* ============================================
   导航栏
   ============================================ */
.navbar {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    z-index: 1000;
    padding: 18px 0;
    transition: var(--transition);
    background: transparent;
}

.navbar.scrolled {
    background: rgba(255,255,255,0.92);
    backdrop-filter: blur(20px);
    -webkit-backdrop-filter: blur(20px);
    box-shadow: 0 1px 12px rgba(0,0,0,0.06);
    padding: 12px 0;
}

.nav-container {
    max-width: var(--container-max);
    margin: 0 auto;
    padding: 0 24px;
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 32px;
}

.nav-logo {
    display: flex;
    align-items: center;
    gap: 10px;
    flex-shrink: 0;
}

.logo-icon {
    width: 34px;
    height: 34px;
    object-fit: contain;
    background: #fff;
    border-radius: 8px;
    padding: 4px;
    box-sizing: border-box;
    box-shadow: 0 2px 6px rgba(0,0,0,0.12);
    display: block;
    flex-shrink: 0;
}

.logo-text {
    font-size: 15px;
    font-weight: 700;
    color: var(--color-text);
    letter-spacing: 0;
    white-space: nowrap;
}

.navbar:not(.scrolled) .logo-text {
    color: #fff;
}

.nav-menu {
    display: flex;
    gap: 36px;
    align-items: center;
}

.nav-link {
    font-size: 15px;
    font-weight: 500;
    color: var(--color-text-on-dark-light);
    transition: var(--transition);
    position: relative;
}

.navbar:not(.scrolled) .nav-link {
    color: rgba(255,255,255,0.8);
}

.navbar.scrolled .nav-link {
    color: var(--color-text-medium);
}

.nav-link:hover {
    color: var(--color-accent);
}

.nav-link::after {
    content: '';
    position: absolute;
    bottom: -6px;
    left: 0;
    width: 0;
    height: 2px;
    background: var(--color-accent);
    border-radius: 2px;
    transition: var(--transition);
}

.nav-link:hover::after {
    width: 100%;
}

.nav-cta {
    padding: 10px 22px;
    background: var(--color-primary);
    color: #fff;
    border-radius: var(--radius-sm);
    font-size: 14px;
    font-weight: 600;
    transition: var(--transition);
    flex-shrink: 0;
}

.nav-cta:hover {
    background: var(--color-primary-dark);
    transform: translateY(-2px);
    box-shadow: var(--shadow-blue);
}

.nav-toggle {
    display: none;
    flex-direction: column;
    gap: 5px;
    background: none;
    border: none;
    cursor: pointer;
    padding: 6px;
}

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

.navbar:not(.scrolled) .nav-toggle span {
    background: #fff;
}

.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(7px, -7px);
}

/* ============================================
   Hero 首屏
   ============================================ */
.hero {
    position: relative;
    min-height: 100vh;
    display: flex;
    align-items: center;
    background: var(--color-dark);
    overflow: hidden;
    padding-top: 80px;
}

.hero-bg {
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    z-index: 0;
}

/* 网格背景 */
.hero-grid {
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background-image:
        linear-gradient(rgba(255,255,255,0.03) 1px, transparent 1px),
        linear-gradient(90deg, rgba(255,255,255,0.03) 1px, transparent 1px);
    background-size: 60px 60px;
    mask-image: radial-gradient(ellipse at center, black 30%, transparent 80%);
    -webkit-mask-image: radial-gradient(ellipse at center, black 30%, transparent 80%);
}

/* 光晕 */
.hero-glow {
    position: absolute;
    border-radius: 50%;
    filter: blur(80px);
    opacity: 0.5;
}

.hero-glow-1 {
    width: 600px;
    height: 600px;
    background: radial-gradient(circle, rgba(30,58,138,0.7) 0%, transparent 70%);
    top: -100px;
    left: -100px;
    animation: floatGlow 12s ease-in-out infinite;
}

.hero-glow-2 {
    width: 500px;
    height: 500px;
    background: radial-gradient(circle, rgba(59,130,246,0.4) 0%, transparent 70%);
    bottom: -100px;
    right: -50px;
    animation: floatGlow 12s ease-in-out infinite reverse;
}

@keyframes floatGlow {
    0%, 100% { transform: translate(0, 0); }
    50% { transform: translate(40px, -30px); }
}

.hero-container {
    position: relative;
    z-index: 1;
    max-width: var(--container-max);
    margin: 0 auto;
    padding: 0 24px;
    text-align: center;
}

.hero-badge {
    display: inline-flex;
    align-items: center;
    gap: 8px;
    padding: 8px 18px;
    background: rgba(255,255,255,0.08);
    border: 1px solid rgba(255,255,255,0.12);
    border-radius: 30px;
    font-size: 13px;
    color: var(--color-text-on-dark);
    margin-bottom: 32px;
    backdrop-filter: blur(10px);
    animation: fadeInUp 0.8s ease;
}

.badge-dot {
    width: 8px;
    height: 8px;
    background: var(--color-cyan);
    border-radius: 50%;
    box-shadow: 0 0 12px var(--color-cyan);
    animation: pulse 2s ease-in-out infinite;
}

@keyframes pulse {
    0%, 100% { opacity: 1; transform: scale(1); }
    50% { opacity: 0.5; transform: scale(1.3); }
}

.hero-title {
    font-size: 64px;
    font-weight: 900;
    color: #fff;
    line-height: 1.15;
    letter-spacing: -1.5px;
    margin-bottom: 24px;
    animation: fadeInUp 0.8s ease 0.1s both;
}

.hero-subtitle {
    font-size: 19px;
    color: var(--color-text-on-dark-light);
    line-height: 1.7;
    margin-bottom: 40px;
    animation: fadeInUp 0.8s ease 0.2s both;
}

.hero-actions {
    display: flex;
    gap: 16px;
    justify-content: center;
    margin-bottom: 64px;
    animation: fadeInUp 0.8s ease 0.3s both;
}

.hero-actions .btn-ghost {
    color: #fff;
    border-color: rgba(255,255,255,0.2);
}

.hero-actions .btn-ghost:hover {
    border-color: var(--color-accent);
    background: rgba(59,130,246,0.1);
}

.hero-stats {
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 48px;
    animation: fadeInUp 0.8s ease 0.4s both;
}

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

.hero-stat-num {
    font-size: 40px;
    font-weight: 800;
    color: #fff;
    line-height: 1;
}

.hero-stat-num span {
    background: var(--gradient-primary);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.hero-stat-label {
    font-size: 14px;
    color: var(--color-text-on-dark-light);
    margin-top: 8px;
}

.hero-stat-divider {
    width: 1px;
    height: 48px;
    background: rgba(255,255,255,0.12);
}

.hero-scroll {
    position: absolute;
    bottom: 32px;
    left: 50%;
    transform: translateX(-50%);
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 8px;
    color: rgba(255,255,255,0.4);
    font-size: 12px;
    animation: bounce 2s ease-in-out infinite;
}

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

@keyframes fadeInUp {
    from {
        opacity: 0;
        transform: translateY(30px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

/* ============================================
   信任栏
   ============================================ */
.trust-bar {
    padding: 56px 0;
    background: var(--color-bg);
    border-bottom: 1px solid var(--color-border);
}

.trust-label {
    text-align: center;
    font-size: 14px;
    color: var(--color-text-light);
    letter-spacing: 1px;
    text-transform: uppercase;
    margin-bottom: 32px;
    font-weight: 500;
}

.trust-logos {
    display: flex;
    flex-wrap: wrap;
    justify-content: center;
    align-items: center;
    gap: 48px;
}

.trust-logo {
    font-size: 18px;
    font-weight: 700;
    color: var(--color-text-light);
    opacity: 0.6;
    transition: var(--transition);
    cursor: default;
}

.trust-logo:hover {
    opacity: 1;
    color: var(--color-text);
}

/* ============================================
   服务板块
   ============================================ */
.services {
    padding: 100px 0;
    background: var(--color-bg-alt);
}

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

.service-card {
    background: #fff;
    border: 1px solid var(--color-border);
    border-radius: var(--radius-lg);
    padding: 36px 32px;
    transition: var(--transition);
    position: relative;
    overflow: hidden;
}

.service-card::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    height: 3px;
    background: var(--gradient-primary);
    transform: scaleX(0);
    transform-origin: left;
    transition: var(--transition);
}

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

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

.service-icon {
    width: 56px;
    height: 56px;
    border-radius: var(--radius-md);
    background: rgba(30,64,175,0.08);
    color: var(--color-primary);
    display: flex;
    align-items: center;
    justify-content: center;
    margin-bottom: 24px;
    transition: var(--transition);
}

.service-icon svg {
    width: 32px;
    height: 32px;
}

.service-card:hover .service-icon {
    background: var(--gradient-primary);
    color: #fff;
    transform: scale(1.05);
}

.service-title {
    font-size: 20px;
    font-weight: 700;
    color: var(--color-text);
    margin-bottom: 12px;
}

.service-desc {
    font-size: 15px;
    color: var(--color-text-medium);
    line-height: 1.7;
    margin-bottom: 20px;
}

.service-features {
    display: flex;
    flex-direction: column;
    gap: 8px;
}

.service-features li {
    font-size: 14px;
    color: var(--color-text-medium);
    padding-left: 24px;
    position: relative;
}

.service-features li::before {
    content: '';
    position: absolute;
    left: 0;
    top: 7px;
    width: 14px;
    height: 8px;
    border-left: 2px solid var(--color-accent);
    border-bottom: 2px solid var(--color-accent);
    transform: rotate(-45deg);
}

/* ============================================
   解决方案板块
   ============================================ */
.solutions {
    padding: 100px 0;
    background: var(--color-bg);
}

.solution-row {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 64px;
    align-items: center;
    margin-bottom: 100px;
}

.solution-row:last-child {
    margin-bottom: 0;
}

.solution-row.reverse .solution-visual {
    order: 2;
}

/* 3D可视化卡片 */
.solution-card-3d {
    background: var(--gradient-primary);
    border-radius: var(--radius-xl);
    padding: 32px;
    box-shadow: var(--shadow-xl);
    position: relative;
    overflow: hidden;
}

.solution-card-3d::before {
    content: '';
    position: absolute;
    top: -50%;
    right: -50%;
    width: 200%;
    height: 200%;
    background: radial-gradient(circle, rgba(255,255,255,0.06) 0%, transparent 50%);
}

.card-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 28px;
    position: relative;
}

.card-tag {
    font-size: 13px;
    color: rgba(255,255,255,0.7);
    font-weight: 500;
}

.card-status {
    font-size: 12px;
    color: #4ADE80;
    font-weight: 500;
}

.card-body {
    position: relative;
}

.card-metric {
    margin-bottom: 20px;
}

.metric-label {
    font-size: 13px;
    color: rgba(255,255,255,0.6);
    margin-bottom: 6px;
}

.metric-value {
    font-size: 28px;
    font-weight: 800;
    color: #fff;
    margin-bottom: 8px;
}

.metric-bar {
    height: 6px;
    background: rgba(255,255,255,0.1);
    border-radius: 3px;
    overflow: hidden;
}

.metric-fill {
    height: 100%;
    background: linear-gradient(90deg, #3B82F6, #fff);
    border-radius: 3px;
    transition: width 1.5s ease;
}

/* 柱状图卡片 */
.card-chart {
    display: flex;
    align-items: flex-end;
    justify-content: space-around;
    height: 140px;
    gap: 16px;
    margin-bottom: 20px;
}

.chart-bar {
    flex: 1;
    background: rgba(255,255,255,0.15);
    border-radius: 6px 6px 0 0;
    position: relative;
    transition: var(--transition);
}

.chart-bar.highlight {
    background: linear-gradient(180deg, #3B82F6, rgba(59,130,246,0.3));
}

.chart-bar span {
    position: absolute;
    bottom: -24px;
    left: 50%;
    transform: translateX(-50%);
    font-size: 12px;
    color: rgba(255,255,255,0.5);
}

.card-metric-inline {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding-top: 24px;
    border-top: 1px solid rgba(255,255,255,0.1);
}

.card-metric-inline span {
    font-size: 14px;
    color: rgba(255,255,255,0.6);
}

.card-metric-inline strong {
    font-size: 22px;
    color: #fff;
    font-weight: 800;
}

/* 仪表盘卡片 */
.card-gauge {
    display: flex;
    justify-content: center;
    margin-bottom: 20px;
}

.gauge-ring {
    position: relative;
    width: 140px;
    height: 140px;
}

.gauge-ring svg {
    width: 100%;
    height: 100%;
}

.gauge-text {
    position: absolute;
    top: 50%;
    left: 50%;
    transform: translate(-50%, -50%);
    text-align: center;
}

.gauge-value {
    font-size: 32px;
    font-weight: 800;
    color: #fff;
}

.gauge-label {
    font-size: 12px;
    color: rgba(255,255,255,0.5);
}

/* 解决方案文字 */
.solution-industry {
    display: inline-block;
    padding: 5px 14px;
    background: rgba(30,64,175,0.08);
    color: var(--color-primary);
    border-radius: 16px;
    font-size: 13px;
    font-weight: 600;
    margin-bottom: 16px;
}

.solution-title {
    font-size: 28px;
    font-weight: 800;
    color: var(--color-text);
    margin-bottom: 16px;
    line-height: 1.35;
}

.solution-desc {
    font-size: 16px;
    color: var(--color-text-medium);
    line-height: 1.8;
    margin-bottom: 24px;
}

.solution-points {
    display: flex;
    flex-direction: column;
    gap: 12px;
    margin-bottom: 28px;
}

.solution-points li {
    font-size: 15px;
    color: var(--color-text);
    display: flex;
    align-items: center;
    gap: 12px;
}

.check-icon {
    width: 20px;
    height: 20px;
    background: var(--gradient-primary);
    border-radius: 50%;
    flex-shrink: 0;
    position: relative;
}

.check-icon::after {
    content: '';
    position: absolute;
    top: 5px;
    left: 6px;
    width: 6px;
    height: 10px;
    border-right: 2px solid #fff;
    border-bottom: 2px solid #fff;
    transform: rotate(45deg);
}

.solution-link {
    font-size: 15px;
    font-weight: 600;
    color: var(--color-primary);
    transition: var(--transition);
}

.solution-link:hover {
    gap: 4px;
    color: var(--color-cyan);
}

/* ============================================
   核心优势
   ============================================ */
.advantages {
    padding: 100px 0;
    background: var(--color-bg-alt);
}

.advantages-grid {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: 24px;
    margin-bottom: 80px;
}

.advantage-item {
    text-align: left;
    padding: 36px 28px;
    background: #fff;
    border-radius: var(--radius-lg);
    border: 1px solid var(--color-border);
    transition: var(--transition);
}

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

.advantage-number {
    font-size: 48px;
    font-weight: 900;
    background: var(--gradient-primary);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
    line-height: 1;
    margin-bottom: 20px;
    opacity: 0.9;
}

.advantage-title {
    font-size: 18px;
    font-weight: 700;
    color: var(--color-text);
    margin-bottom: 12px;
}

.advantage-desc {
    font-size: 14px;
    color: var(--color-text-medium);
    line-height: 1.7;
}

/* 数据统计带 */
.stats-band {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: 24px;
    background: var(--color-dark);
    border-radius: var(--radius-xl);
    padding: 56px 48px;
    position: relative;
    overflow: hidden;
}

.stats-band::before {
    content: '';
    position: absolute;
    top: -50%;
    left: -20%;
    width: 60%;
    height: 200%;
    background: radial-gradient(circle, rgba(30,64,175,0.3) 0%, transparent 60%);
}

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

.stat-number {
    font-size: 44px;
    font-weight: 900;
    color: #fff;
    line-height: 1;
    margin-bottom: 8px;
}

.stat-number::after {
    content: attr(data-suffix);
    background: var(--gradient-primary);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.stat-label {
    font-size: 15px;
    color: var(--color-text-on-dark-light);
}

/* ============================================
   关于我们
   ============================================ */
.about {
    padding: 100px 0;
    background: var(--color-bg);
}

.about-wrapper {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 80px;
    align-items: center;
}

.about-left .section-tag {
    margin-bottom: 20px;
}

.about-left .section-title {
    text-align: left;
    margin-bottom: 24px;
}

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

.about-credentials {
    display: flex;
    flex-wrap: wrap;
    gap: 16px;
    margin-top: 32px;
}

.credential {
    display: flex;
    align-items: center;
    gap: 8px;
    font-size: 14px;
    color: var(--color-text);
    font-weight: 500;
}

/* 关于我们 - 卡片堆叠 */
.about-card-stack {
    position: relative;
    height: 420px;
}

.about-card {
    position: absolute;
    background: #fff;
    border-radius: var(--radius-lg);
    padding: 32px;
    box-shadow: var(--shadow-lg);
    border: 1px solid var(--color-border);
    transition: var(--transition-slow);
}

.about-card-1 {
    top: 0;
    right: 40px;
    width: 280px;
    z-index: 3;
}

.about-card-1:hover {
    transform: translateY(-8px);
}

.about-card-2 {
    top: 120px;
    left: 20px;
    width: 280px;
    z-index: 2;
}

.about-card-2:hover {
    transform: translateY(-8px);
    z-index: 4;
}

.about-card-3 {
    top: 240px;
    right: 60px;
    width: 280px;
    z-index: 1;
}

.about-card-3:hover {
    transform: translateY(-8px);
    z-index: 4;
}

.about-card-icon {
    width: 48px;
    height: 48px;
    border-radius: var(--radius-md);
    background: rgba(30,64,175,0.08);
    color: var(--color-primary);
    display: flex;
    align-items: center;
    justify-content: center;
    margin-bottom: 20px;
}

.about-card h4 {
    font-size: 18px;
    font-weight: 700;
    color: var(--color-text);
    margin-bottom: 8px;
}

.about-card p {
    font-size: 14px;
    color: var(--color-text-medium);
    line-height: 1.6;
}

/* ============================================
   联系我们 CTA
   ============================================ */
.contact-cta {
    padding: 100px 0;
    background: var(--color-bg-alt);
}

.contact-wrapper {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 64px;
    align-items: center;
    background: var(--color-dark);
    border-radius: var(--radius-xl);
    padding: 64px;
    position: relative;
    overflow: hidden;
}

.contact-bg-glow {
    position: absolute;
    top: -100px;
    right: -100px;
    width: 400px;
    height: 400px;
    background: radial-gradient(circle, rgba(30,64,175,0.4) 0%, transparent 70%);
    border-radius: 50%;
    filter: blur(60px);
}

.contact-content {
    position: relative;
    z-index: 1;
}

.contact-title {
    font-size: 36px;
    font-weight: 800;
    color: #fff;
    line-height: 1.3;
    margin-bottom: 16px;
    letter-spacing: -0.5px;
}

.contact-desc {
    font-size: 16px;
    color: var(--color-text-on-dark-light);
    line-height: 1.7;
    margin-bottom: 32px;
}

.contact-info {
    display: flex;
    flex-direction: column;
    gap: 16px;
}

.contact-info-item {
    display: flex;
    align-items: center;
    gap: 12px;
    color: var(--color-text-on-dark);
    font-size: 15px;
}

.contact-info-item svg {
    color: var(--color-cyan);
    flex-shrink: 0;
}

/* 联系表单 */
.contact-form {
    background: #fff;
    border-radius: var(--radius-lg);
    padding: 40px;
    position: relative;
    z-index: 1;
    box-shadow: var(--shadow-xl);
}

.form-title {
    font-size: 22px;
    font-weight: 700;
    color: var(--color-text);
    margin-bottom: 24px;
}

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

.form-group input,
.form-group textarea {
    width: 100%;
    padding: 14px 16px;
    border: 1.5px solid var(--color-border);
    border-radius: var(--radius-sm);
    font-size: 15px;
    color: var(--color-text);
    transition: var(--transition);
    font-family: inherit;
    background: var(--color-bg-alt);
}

.form-group input:focus,
.form-group textarea:focus {
    outline: none;
    border-color: var(--color-accent);
    background: #fff;
    box-shadow: 0 0 0 4px rgba(59,130,246,0.1);
}

.form-group textarea {
    resize: vertical;
}

.form-note {
    text-align: center;
    font-size: 12px;
    color: var(--color-text-light);
    margin-top: 12px;
}

/* ============================================
   页脚
   ============================================ */
.footer {
    background: var(--color-dark);
    padding: 64px 0 32px;
}

.footer-main {
    display: grid;
    grid-template-columns: 1.5fr 2fr;
    gap: 64px;
    padding-bottom: 48px;
    border-bottom: 1px solid var(--color-border-dark);
}

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

.footer-logo .logo-icon {
    width: 48px;
    height: 48px;
    object-fit: contain;
    background: #fff;
    border-radius: 12px;
    padding: 6px;
    box-sizing: border-box;
    flex-shrink: 0;
}

.footer-logo .logo-text {
    color: #fff;
    font-size: 16px;
    font-weight: 700;
}

.footer-desc {
    font-size: 14px;
    color: var(--color-text-on-dark-light);
    line-height: 1.7;
    margin-bottom: 24px;
    max-width: 320px;
}

.footer-social {
    display: flex;
    gap: 12px;
}

.social-link {
    width: 40px;
    height: 40px;
    border-radius: var(--radius-sm);
    background: rgba(255,255,255,0.06);
    color: var(--color-text-on-dark-light);
    display: flex;
    align-items: center;
    justify-content: center;
    transition: var(--transition);
}

.social-link:hover {
    background: var(--color-primary);
    color: #fff;
    transform: translateY(-2px);
}

.footer-links {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 32px;
}

.footer-col-title {
    font-size: 15px;
    font-weight: 600;
    color: #fff;
    margin-bottom: 20px;
}

.footer-col a {
    display: block;
    font-size: 14px;
    color: var(--color-text-on-dark-light);
    margin-bottom: 12px;
    transition: var(--transition);
}

.footer-col a:hover {
    color: var(--color-accent);
}

.footer-bottom {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding-top: 24px;
    font-size: 13px;
    color: var(--color-text-on-dark-light);
}

.footer-legal {
    display: flex;
    gap: 24px;
}

.footer-legal a:hover {
    color: var(--color-accent);
}

/* ============================================
   滚动动画
   ============================================ */
.reveal {
    opacity: 0;
    transform: translateY(40px);
    transition: opacity 0.7s ease, transform 0.7s ease;
}

.reveal.visible {
    opacity: 1;
    transform: translateY(0);
}

/* ============================================
   响应式适配
   ============================================ */
@media (max-width: 1024px) {
    .hero-title { font-size: 48px; }
    .section-title { font-size: 32px; }
    .services-grid { grid-template-columns: repeat(2, 1fr); }
    .advantages-grid { grid-template-columns: repeat(2, 1fr); }
    .stats-band { grid-template-columns: repeat(2, 1fr); gap: 32px; }
    .about-wrapper { grid-template-columns: 1fr; gap: 48px; }
    .about-card-stack { max-width: 400px; margin: 0 auto; }
    .solution-row { grid-template-columns: 1fr; gap: 40px; }
    .solution-row.reverse .solution-visual { order: 0; }
    .contact-wrapper { grid-template-columns: 1fr; gap: 40px; padding: 48px; }
    .footer-main { grid-template-columns: 1fr; gap: 40px; }
}

@media (max-width: 768px) {
    /* 导航栏移动端 */
    .nav-menu {
        position: fixed;
        top: 0;
        right: -100%;
        width: 75%;
        max-width: 320px;
        height: 100vh;
        background: #fff;
        flex-direction: column;
        justify-content: center;
        gap: 24px;
        padding: 40px;
        transition: right 0.4s ease;
        box-shadow: -10px 0 40px rgba(0,0,0,0.1);
    }

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

    .nav-menu .nav-link {
        color: var(--color-text) !important;
        font-size: 18px;
    }

    .nav-cta { display: none; }
    .nav-toggle { display: flex; }

    /* Hero */
    .hero-title { font-size: 36px; }
    .hero-subtitle { font-size: 16px; }
    .hero-stats { flex-wrap: wrap; gap: 24px; }
    .hero-stat-num { font-size: 32px; }
    .hero-stat-divider { display: none; }
    .hero-actions { flex-direction: column; align-items: center; }
    .hero-actions .btn { width: 100%; max-width: 280px; justify-content: center; }

    /* 通用 */
    .section-title { font-size: 26px; }
    .section-desc { font-size: 15px; }
    .section-header { margin-bottom: 40px; }

    /* 服务 */
    .services-grid { grid-template-columns: 1fr; }

    /* 解决方案 */
    .solution-title { font-size: 22px; }

    /* 优势 */
    .advantages-grid { grid-template-columns: 1fr; }
    .stats-band { grid-template-columns: 1fr 1fr; padding: 32px 24px; }
    .stat-number { font-size: 32px; }

    /* 关于 */
    .about-card-stack { height: auto; display: flex; flex-direction: column; gap: 16px; }
    .about-card { position: relative; width: 100% !important; top: 0 !important; left: 0 !important; right: 0 !important; }

    /* 联系 */
    .contact-wrapper { padding: 32px 24px; }
    .contact-title { font-size: 24px; }
    .contact-form { padding: 28px; }

    /* 页脚 */
    .footer-main { grid-template-columns: 1fr; }
    .footer-links { grid-template-columns: 1fr; gap: 24px; }
    .footer-bottom { flex-direction: column; gap: 16px; text-align: center; }
    .footer-legal { flex-wrap: wrap; justify-content: center; }

    /* 信任栏 */
    .trust-logos { gap: 24px; }
    .trust-logo { font-size: 15px; }

    /* 区块间距 */
    .services, .solutions, .advantages, .about, .contact-cta { padding: 64px 0; }
}

@media (max-width: 480px) {
    .hero-title { font-size: 30px; }
    .stats-band { grid-template-columns: 1fr; }
}