:root {
    --primary: #1565c0;
    --primary-dark: #0d47a1;
    --primary-light: #e3f2fd;
    --accent: #f59e0b;
    --accent-glow: rgba(245, 158, 11, 0.15);
    --bg: #ffffff;
    --bg-warm: #f8fafc;
    --bg-hero: linear-gradient(180deg, #f0f7ff 0%, #ffffff 40%, #f8fafc 100%);
    --text: #0f172a;
    --text-secondary: #475569;
    --text-muted: #94a3b8;
    --border: #e2e8f0;
    --border-light: #f1f5f9;
    --border-hover: #cbd5e1;
    --success: #22c55e;
    --secondary: #64748b;
    --bg-light: #f1f5f9;
    --shadow-sm: 0 1px 2px rgba(0,0,0,0.04);
    --shadow: 0 4px 12px rgba(0,0,0,0.06);
    --shadow-lg: 0 12px 40px rgba(0,0,0,0.08);
    --shadow-xl: 0 24px 60px rgba(0,0,0,0.1);
    --shadow-glow: 0 0 0 1px rgba(26, 86, 219, 0.05), 0 8px 32px rgba(26, 86, 219, 0.08);
    --radius: 10px;
    --radius-lg: 16px;
    --radius-xl: 20px;
    --transition: all 0.35s cubic-bezier(0.4, 0, 0.2, 1);
}

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

html {
    scroll-behavior: smooth;
}

body {
    font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, "Noto Sans SC", "PingFang SC", "Microsoft YaHei", sans-serif;
    color: var(--text);
    line-height: 1.65;
    background: var(--bg);
    -webkit-font-smoothing: antialiased;
    overflow-x: hidden;
}

::selection {
    background: var(--primary-light);
    color: var(--primary-dark);
}

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

.section {
    padding: 110px 0;
    position: relative;
}

/* ===== 导航栏 ===== */
.navbar {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    z-index: 1000;
    background: rgba(255, 255, 255, 0.92);
    backdrop-filter: blur(20px) saturate(150%);
    border-bottom: 1px solid var(--border-light);
    transition: var(--transition);
}

.navbar.scrolled {
    background: rgba(255, 255, 255, 0.98);
    box-shadow: var(--shadow-sm);
}

.nav-container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 24px;
    display: flex;
    justify-content: space-between;
    align-items: center;
    height: 68px;
}

.nav-logo {
    display: flex;
    align-items: center;
    gap: 12px;
    text-decoration: none;
    color: var(--text);
    font-weight: 800;
    font-size: 1.625rem;
    letter-spacing: -0.02em;
}

.logo-img {
    width: 42px;
    height: 42px;
    border-radius: 10px;
    object-fit: cover;
}

.nav-menu {
    display: flex;
    list-style: none;
    gap: 2.25rem;
}

.nav-link {
    text-decoration: none;
    color: var(--text-secondary);
    font-weight: 600;
    font-size: 1.25rem;
    transition: var(--transition);
    position: relative;
    padding: 6px 0;
}

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

.nav-link.active {
    color: var(--primary);
    font-weight: 700;
}

.nav-link::after {
    content: '';
    position: absolute;
    bottom: -4px;
    left: 50%;
    width: 0;
    height: 3px;
    background: linear-gradient(90deg, var(--primary), var(--accent));
    border-radius: 2px;
    transition: all 0.35s cubic-bezier(0.4, 0, 0.2, 1);
    transform: translateX(-50%);
}

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

.nav-link.active::after {
    width: 100%;
    height: 3px;
}

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

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

/* ===== Hero ===== */
.hero {
    min-height: 100vh;
    display: flex;
    flex-direction: column;
    justify-content: center;
    align-items: center;
    text-align: center;
    position: relative;
    background: var(--bg-hero);
    overflow: hidden;
    padding: 140px 24px 100px;
}

/* 右上角淡蓝光晕 */
.hero::before {
    content: '';
    position: absolute;
    top: -200px;
    right: -200px;
    width: 600px;
    height: 600px;
    background: radial-gradient(circle, rgba(26, 86, 219, 0.08), transparent 70%);
    pointer-events: none;
}

/* 左下角淡青光晕 */
.hero::after {
    content: '';
    position: absolute;
    bottom: -150px;
    left: -150px;
    width: 500px;
    height: 500px;
    background: radial-gradient(circle, rgba(245, 158, 11, 0.06), transparent 70%);
    pointer-events: none;
}

/* 极淡网格线 */
.hero-grid {
    position: absolute;
    inset: 0;
    background-image:
        linear-gradient(rgba(26, 86, 219, 0.04) 1px, transparent 1px),
        linear-gradient(90deg, rgba(26, 86, 219, 0.04) 1px, transparent 1px);
    background-size: 80px 80px;
    pointer-events: none;
}

/* 漂浮粒子（小光点） */
.hero-particles {
    position: absolute;
    inset: 0;
    pointer-events: none;
    overflow: hidden;
}

.particle {
    position: absolute;
    width: 4px;
    height: 4px;
    background: var(--accent);
    border-radius: 50%;
    opacity: 0;
    animation: floatParticle 12s infinite ease-in-out;
}

@keyframes floatParticle {
    0% { transform: translateY(100vh) scale(0); opacity: 0; }
    15% { opacity: 0.6; }
    85% { opacity: 0.6; }
    100% { transform: translateY(-20vh) scale(1); opacity: 0; }
}

.hero-content {
    position: relative;
    z-index: 2;
    max-width: 800px;
}

.hero-badge {
    display: inline-flex;
    align-items: center;
    gap: 8px;
    background: var(--primary-light);
    border: 1px solid rgba(26, 86, 219, 0.12);
    padding: 8px 18px;
    border-radius: 100px;
    font-size: 0.875rem;
    margin-bottom: 2rem;
    color: var(--primary);
    font-weight: 500;
}

.badge-dot {
    width: 8px;
    height: 8px;
    background: #22c55e;
    border-radius: 50%;
    animation: pulse 2s infinite;
}

@keyframes pulse {
    0%, 100% { opacity: 1; transform: scale(1); }
    50% { opacity: 0.5; transform: scale(0.8); }
}

.hero-title {
    font-size: clamp(2.5rem, 5.5vw, 4.5rem);
    font-weight: 800;
    line-height: 1.08;
    margin-bottom: 1.5rem;
    letter-spacing: -0.03em;
    color: var(--text);
}

.gradient-text {
    background: linear-gradient(135deg, var(--primary) 0%, var(--accent) 100%);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
    filter: drop-shadow(0 2px 8px rgba(26, 86, 219, 0.15));
}

.hero-desc {
    font-size: clamp(1rem, 1.8vw, 1.25rem);
    color: var(--text-secondary);
    max-width: 580px;
    margin: 0 auto 2.5rem;
    line-height: 1.8;
}

.hero-actions {
    display: flex;
    gap: 1rem;
    justify-content: center;
    flex-wrap: wrap;
    margin-bottom: 4rem;
}

.hero-stats {
    display: flex;
    justify-content: center;
    align-items: center;
    gap: 0;
    flex-wrap: wrap;
}

.stat-item {
    text-align: center;
    padding: 1.5rem 2.5rem;
    background: rgba(255, 255, 255, 0.7);
    backdrop-filter: blur(10px);
    border-radius: var(--radius-lg);
    border: 1px solid rgba(226, 232, 240, 0.6);
    transition: var(--transition);
    min-width: 140px;
}

.stat-item:hover {
    transform: translateY(-4px);
    box-shadow: var(--shadow-lg);
    border-color: rgba(26, 86, 219, 0.15);
}

.stat-number {
    display: block;
    font-size: 2.25rem;
    font-weight: 800;
    color: var(--primary);
    line-height: 1;
    letter-spacing: -0.02em;
}

.stat-label {
    font-size: 0.875rem;
    color: var(--text-muted);
    margin-top: 0.5rem;
    font-weight: 500;
}

.scroll-indicator {
    position: absolute;
    bottom: 40px;
    left: 50%;
    transform: translateX(-50%);
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 8px;
    color: var(--text-muted);
    font-size: 0.75rem;
    animation: bounce 2s infinite;
}

.scroll-mouse {
    width: 24px;
    height: 36px;
    border: 2px solid var(--text-muted);
    border-radius: 12px;
    display: flex;
    justify-content: center;
    padding-top: 8px;
}

.scroll-wheel {
    width: 4px;
    height: 8px;
    background: var(--primary);
    border-radius: 2px;
    animation: scroll 2s infinite;
}

@keyframes scroll {
    0% { transform: translateY(0); opacity: 1; }
    100% { transform: translateY(12px); opacity: 0; }
}

@keyframes bounce {
    0%, 100% { transform: translateX(-50%) translateY(0); }
    50% { transform: translateX(-50%) translateY(-10px); }
}

/* ===== 按钮 ===== */
.btn {
    display: inline-flex;
    align-items: center;
    gap: 8px;
    padding: 13px 28px;
    border-radius: var(--radius);
    font-weight: 600;
    font-size: 0.9375rem;
    text-decoration: none;
    border: none;
    cursor: pointer;
    transition: var(--transition);
    font-family: inherit;
    position: relative;
    overflow: hidden;
}

.btn-lg {
    padding: 15px 32px;
    font-size: 1rem;
}

.btn-primary {
    background: linear-gradient(135deg, var(--primary), var(--primary-dark));
    color: white;
    box-shadow: 0 4px 16px rgba(26, 86, 219, 0.3), 0 0 0 1px rgba(255,255,255,0.1) inset;
}

.btn-primary::before {
    content: '';
    position: absolute;
    top: 0;
    left: -100%;
    width: 100%;
    height: 100%;
    background: linear-gradient(90deg, transparent, rgba(255,255,255,0.25), transparent);
    transition: left 0.6s;
}

.btn-primary:hover {
    transform: translateY(-3px);
    box-shadow: 0 12px 32px rgba(26, 86, 219, 0.35), 0 0 0 1px rgba(255,255,255,0.1) inset;
}

.btn-primary:hover::before {
    left: 100%;
}

.btn-primary:active {
    transform: translateY(-1px);
}

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

.btn-ghost:hover {
    border-color: var(--primary);
    color: var(--primary);
    box-shadow: var(--shadow);
}

.btn-arrow {
    transition: transform 0.2s;
}

.btn:hover .btn-arrow {
    transform: translateX(4px);
}

/* ===== Section Header ===== */
.section-header {
    text-align: center;
    max-width: 640px;
    margin: 0 auto 4rem;
}

.section-tag {
    display: inline-block;
    background: var(--primary-light);
    color: var(--primary);
    padding: 6px 16px;
    border-radius: 100px;
    font-size: 0.875rem;
    font-weight: 600;
    margin-bottom: 1rem;
}

.section-title {
    font-size: clamp(1.75rem, 3.5vw, 2.75rem);
    font-weight: 800;
    line-height: 1.2;
    margin-bottom: 1rem;
    color: var(--text);
    letter-spacing: -0.02em;
}

.section-desc {
    color: var(--text-secondary);
    font-size: 1.125rem;
    line-height: 1.7;
}

/* ===== 服务卡片 ===== */
.services-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(270px, 1fr));
    gap: 1.5rem;
}

.service-card {
    background: white;
    border: 1px solid var(--border);
    border-radius: var(--radius-lg);
    padding: 2rem;
    transition: var(--transition);
    position: relative;
    overflow: hidden;
}

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

.service-card::after {
    content: '';
    position: absolute;
    inset: 0;
    border-radius: var(--radius-lg);
    opacity: 0;
    transition: opacity 0.4s ease;
    box-shadow: inset 0 0 0 1px rgba(26, 86, 219, 0.08);
    pointer-events: none;
}

.service-card:hover {
    border-color: transparent;
    box-shadow: var(--shadow-xl), 0 0 0 1px rgba(26, 86, 219, 0.06);
    transform: translateY(-6px);
}

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

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

.service-icon-wrap {
    width: 56px;
    height: 56px;
    border-radius: var(--radius);
    display: flex;
    align-items: center;
    justify-content: center;
    margin-bottom: 1.25rem;
    position: relative;
    transition: var(--transition);
}

.service-card:hover .service-icon-wrap {
    transform: scale(1.1) rotate(-3deg);
}

.service-icon-wrap svg {
    width: 26px;
    height: 26px;
    stroke-width: 1.8;
    transition: var(--transition);
}

.icon-blue { 
    background: linear-gradient(135deg, #eff6ff, #dbeafe); 
    border: 1px solid #bfdbfe;
    box-shadow: 0 4px 12px rgba(59, 130, 246, 0.12);
}
.icon-blue svg { stroke: #2563eb; }

.icon-purple { 
    background: linear-gradient(135deg, #faf5ff, #f3e8ff); 
    border: 1px solid #e9d5ff;
    box-shadow: 0 4px 12px rgba(168, 85, 247, 0.12);
}
.icon-purple svg { stroke: #9333ea; }

.icon-orange { 
    background: linear-gradient(135deg, #fff7ed, #ffedd5); 
    border: 1px solid #fed7aa;
    box-shadow: 0 4px 12px rgba(249, 115, 22, 0.12);
}
.icon-orange svg { stroke: #ea580c; }

.icon-green { 
    background: linear-gradient(135deg, #f0fdf4, #dcfce7); 
    border: 1px solid #bbf7d0;
    box-shadow: 0 4px 12px rgba(34, 197, 94, 0.12);
}
.icon-green svg { stroke: #16a34a; }

.icon-red { 
    background: linear-gradient(135deg, #fef2f2, #fee2e2); 
    border: 1px solid #fecaca;
    box-shadow: 0 4px 12px rgba(239, 68, 68, 0.12);
}
.icon-red svg { stroke: #dc2626; }

.service-card h3 {
    font-size: 1.125rem;
    font-weight: 700;
    margin-bottom: 0.625rem;
    color: var(--text);
}

.service-card > p {
    color: var(--text-secondary);
    margin-bottom: 1rem;
    line-height: 1.65;
    font-size: 0.9375rem;
}

.service-features {
    list-style: none;
}

.service-features li {
    padding: 0.3rem 0;
    color: var(--text-muted);
    font-size: 0.875rem;
    padding-left: 1.125rem;
    position: relative;
}

.service-features li::before {
    content: '';
    position: absolute;
    left: 0;
    top: 0.65rem;
    width: 5px;
    height: 5px;
    background: var(--accent);
    border-radius: 50%;
}

/* 服务工具栈标签 */
.service-tools {
    display: flex;
    flex-wrap: wrap;
    gap: 0.5rem;
    margin: 1rem 0;
}

.tool-tag {
    display: inline-flex;
    align-items: center;
    padding: 0.25rem 0.625rem;
    background: var(--bg-tertiary);
    border: 1px solid var(--border-light);
    border-radius: 6px;
    font-size: 0.75rem;
    font-weight: 500;
    color: var(--text-secondary);
    transition: all 0.2s ease;
}

.tool-tag:hover {
    background: var(--blue-50);
    border-color: var(--blue-200);
    color: var(--blue-700);
}

/* SLA 承诺标签 */
.service-sla {
    display: flex;
    flex-wrap: wrap;
    gap: 0.5rem;
    margin-top: 1rem;
    padding-top: 1rem;
    border-top: 1px solid var(--border-light);
}

.sla-badge {
    display: inline-flex;
    align-items: center;
    gap: 0.35rem;
    padding: 0.35rem 0.625rem;
    background: linear-gradient(135deg, var(--green-50), var(--emerald-50));
    border: 1px solid var(--green-200);
    border-radius: 20px;
    font-size: 0.75rem;
    font-weight: 600;
    color: var(--green-700);
}

.sla-badge svg {
    flex-shrink: 0;
}



/* ===== 解决方案 ===== */
.solutions {
    background: var(--bg-warm);
    position: relative;
}

.solutions::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    height: 1px;
    background: linear-gradient(90deg, transparent, var(--border), transparent);
}

.solution-showcase {
    display: flex;
    flex-direction: column;
    gap: 4rem;
}

.solution-item {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 4rem;
    align-items: center;
}

.solution-item.reverse {
    direction: rtl;
}

.solution-item.reverse > * {
    direction: ltr;
}

.solution-visual {
    position: relative;
    display: flex;
    align-items: center;
    justify-content: center;
    min-height: 340px;
    background: white;
    border-radius: var(--radius-xl);
    border: 1px solid var(--border);
    box-shadow: var(--shadow-lg);
    overflow: hidden;
    padding: 2rem;
}

.solution-visual::before {
    content: '';
    position: absolute;
    inset: 0;
    background: linear-gradient(135deg, rgba(21, 101, 192, 0.03) 0%, rgba(245, 158, 11, 0.03) 100%);
}

.solution-img {
    position: relative;
    z-index: 1;
    width: 100%;
    max-width: 400px;
    height: auto;
    border-radius: var(--radius);
    box-shadow: var(--shadow);
    transition: var(--transition);
}

.solution-visual:hover .solution-img {
    transform: scale(1.03);
    box-shadow: var(--shadow-xl);
}

.solution-tag {
    display: inline-block;
    background: var(--primary-light);
    color: var(--primary);
    padding: 4px 14px;
    border-radius: 100px;
    font-size: 0.8125rem;
    font-weight: 600;
    margin-bottom: 1rem;
}

.solution-content h3 {
    font-size: 1.875rem;
    font-weight: 800;
    margin-bottom: 1rem;
    color: var(--text);
    letter-spacing: -0.01em;
}

.solution-content > p {
    color: var(--text-secondary);
    margin-bottom: 1.5rem;
    line-height: 1.7;
}

.solution-highlights {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 0.625rem;
    margin-bottom: 1.5rem;
}

.highlight {
    display: flex;
    align-items: center;
    gap: 0.5rem;
    color: var(--text-secondary);
    font-size: 0.9375rem;
}

.highlight-icon {
    width: 20px;
    height: 20px;
    border-radius: 50%;
    background: #dcfce7;
    color: #16a34a;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 0.7rem;
    flex-shrink: 0;
}

.solution-actions {
    display: flex;
    gap: 1rem;
    flex-wrap: wrap;
}

.solution-pricing {
    display: flex;
    gap: 1rem;
    margin-bottom: 1.5rem;
}

.price-item {
    padding: 1rem 1.5rem;
    background: white;
    border: 1px solid var(--border);
    border-radius: var(--radius);
    transition: var(--transition);
    position: relative;
    overflow: hidden;
}

.price-item::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    height: 2px;
    background: linear-gradient(90deg, var(--primary), var(--accent));
    opacity: 0;
    transition: opacity 0.3s;
}

.price-item:hover {
    border-color: transparent;
    box-shadow: var(--shadow-lg);
    transform: translateY(-2px);
}

.price-item:hover::before {
    opacity: 1;
}

.price-label {
    display: block;
    font-size: 0.75rem;
    color: var(--text-muted);
    margin-bottom: 0.25rem;
}

.price-value {
    font-size: 1.25rem;
    font-weight: 700;
    color: var(--primary);
}

.price-value span {
    font-size: 0.875rem;
    font-weight: 500;
    color: var(--text-muted);
}

.solution-divider {
    height: 1px;
    background: linear-gradient(90deg, transparent, var(--border), transparent);
}


/* ===== 解决方案新增样式 ===== */

/* 目标客户 */
.solution-target {
    display: flex;
    flex-wrap: wrap;
    align-items: center;
    gap: 0.5rem;
    margin: 1rem 0 1.25rem;
    padding: 0.75rem 1rem;
    background: var(--bg-warm);
    border-radius: var(--radius);
    border: 1px solid var(--border-light);
}

.target-label {
    font-size: 0.75rem;
    font-weight: 600;
    color: var(--text-muted);
    text-transform: uppercase;
    letter-spacing: 0.05em;
}

.target-badge {
    display: inline-flex;
    align-items: center;
    padding: 0.25rem 0.625rem;
    background: white;
    border: 1px solid var(--border);
    border-radius: 100px;
    font-size: 0.75rem;
    font-weight: 500;
    color: var(--text-secondary);
}

/* 技术架构标签 */
.solution-tech {
    display: flex;
    flex-wrap: wrap;
    gap: 0.5rem;
    margin: 1rem 0;
}

.tech-tag {
    display: inline-flex;
    align-items: center;
    padding: 0.25rem 0.625rem;
    background: var(--primary-light);
    border: 1px solid #bbdefb;
    border-radius: 6px;
    font-size: 0.75rem;
    font-weight: 500;
    color: var(--primary-dark);
}

/* 收益统计 */
.solution-stats {
    display: flex;
    gap: 1rem;
    margin: 1rem 0 1.5rem;
}

.stat-box {
    flex: 1;
    text-align: center;
    padding: 0.75rem;
    background: white;
    border: 1px solid var(--border);
    border-radius: var(--radius);
    transition: var(--transition);
}

.stat-box:hover {
    border-color: var(--primary);
    box-shadow: var(--shadow);
}

.stat-num {
    display: block;
    font-size: 1.5rem;
    font-weight: 800;
    color: var(--primary);
    line-height: 1;
}

.stat-desc {
    display: block;
    font-size: 0.6875rem;
    color: var(--text-muted);
    margin-top: 0.25rem;
}

/* 副标题 */
.solution-subtitle {
    font-size: 1rem;
    font-weight: 600;
    color: var(--primary);
    margin: -0.5rem 0 1rem;
}

/* 定价卡片高亮 */
.price-item.featured {
    border-color: var(--primary);
    background: linear-gradient(135deg, #e3f2fd, #f0f7ff);
    position: relative;
}

.price-item.featured::after {
    content: '推荐';
    position: absolute;
    top: -1px;
    right: -1px;
    background: var(--primary);
    color: white;
    font-size: 0.625rem;
    font-weight: 700;
    padding: 2px 8px;
    border-radius: 0 0 0 8px;
}

.price-note {
    display: block;
    font-size: 0.6875rem;
    color: var(--text-muted);
    margin-top: 0.25rem;
}

/* 惠盾卡片 hover 效果 */
.huidun-card:hover {
    border-color: var(--border-hover);
    box-shadow: var(--shadow-lg);
    transform: translateY(-4px);
}

/* 响应式调整 */
@media (max-width: 768px) {
    .solution-stats {
        flex-direction: column;
        gap: 0.5rem;
    }
    
    .solution-target {
        flex-direction: column;
        align-items: flex-start;
    }
}

/* ===== 为什么选择我们 ===== */
.why-us {
    position: relative;
}

.why-grid {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: 1.5rem;
    max-width: 800px;
    margin: 0 auto;
}

.why-item {
    padding: 2rem;
    background: white;
    border: 1px solid var(--border);
    border-radius: var(--radius-lg);
    transition: var(--transition);
    position: relative;
    overflow: hidden;
}

.why-item::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    width: 3px;
    height: 0;
    background: linear-gradient(180deg, var(--primary), var(--accent));
    transition: height 0.4s ease;
}

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

.why-item:hover::before {
    height: 100%;
}

.why-number {
    font-size: 2.25rem;
    font-weight: 800;
    color: var(--primary);
    opacity: 0.15;
    margin-bottom: 0.25rem;
    font-family: monospace;
    line-height: 1;
}

.why-item h4 {
    font-size: 1.0625rem;
    font-weight: 600;
    margin-bottom: 0.5rem;
    color: var(--text);
}

.why-item p {
    color: var(--text-secondary);
    font-size: 0.9375rem;
    line-height: 1.6;
}

/* ===== 合作流程 ===== */
.process {
    background: var(--bg-warm);
    position: relative;
}

.process-steps {
    display: flex;
    justify-content: center;
    align-items: stretch;
    gap: 0;
    max-width: 900px;
    margin: 0 auto;
}

.step {
    flex: 1;
    text-align: center;
    padding: 1.5rem;
    position: relative;
}

.step-number {
    width: 52px;
    height: 52px;
    border-radius: 50%;
    background: linear-gradient(135deg, var(--primary), var(--accent));
    color: white;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 1.125rem;
    font-weight: 700;
    margin: 0 auto 1rem;
    box-shadow: 0 4px 15px rgba(26, 86, 219, 0.3);
    position: relative;
    z-index: 2;
}

.step:not(:last-child)::after {
    content: '';
    position: absolute;
    top: 26px;
    right: -50%;
    width: 100%;
    height: 2px;
    background: linear-gradient(90deg, var(--primary), var(--accent));
    opacity: 0.25;
    z-index: 1;
}

.step-content h4 {
    font-size: 1rem;
    font-weight: 600;
    margin-bottom: 0.5rem;
    color: var(--text);
}

.step-content p {
    color: var(--text-secondary);
    font-size: 0.875rem;
    line-height: 1.6;
}

.step-arrow {
    display: none;
}

/* ===== 常见问题 ===== */
.faq {
    background: var(--bg-warm);
    position: relative;
}

.faq-list {
    max-width: 800px;
    margin: 0 auto;
    display: flex;
    flex-direction: column;
    gap: 0.75rem;
}

.faq-item {
    background: white;
    border: 1px solid var(--border);
    border-radius: var(--radius-lg);
    overflow: hidden;
    transition: var(--transition);
}

.faq-item:hover {
    border-color: var(--border-hover);
    box-shadow: var(--shadow);
}

.faq-item.active {
    border-color: var(--primary);
    box-shadow: var(--shadow-lg);
}

.faq-question {
    width: 100%;
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 1.25rem 1.5rem;
    background: none;
    border: none;
    cursor: pointer;
    text-align: left;
    font-size: 1rem;
    font-weight: 600;
    color: var(--text);
    font-family: inherit;
    transition: var(--transition);
}

.faq-question:hover {
    color: var(--primary);
}

.faq-question span:first-child {
    flex: 1;
    padding-right: 1rem;
}

.faq-icon {
    width: 28px;
    height: 28px;
    border-radius: 50%;
    background: var(--primary-light);
    color: var(--primary);
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 1.125rem;
    font-weight: 700;
    flex-shrink: 0;
    transition: var(--transition);
}

.faq-item.active .faq-icon {
    background: var(--primary);
    color: white;
    transform: rotate(45deg);
}

.faq-answer {
    max-height: 0;
    overflow: hidden;
    opacity: 0;
    transition: max-height 0.35s ease, opacity 0.25s ease;
    padding: 0 1.5rem;
}

.faq-item.active .faq-answer {
    max-height: 300px;
    opacity: 1;
    padding: 0 1.5rem 1.25rem;
}

.faq-answer p {
    color: var(--text-secondary);
    line-height: 1.7;
    font-size: 0.9375rem;
    margin: 0;
}

/* ===== 关于我们 ===== */
.about {
    position: relative;
}

.about-layout {
    display: grid;
    grid-template-columns: 1fr 1.2fr;
    gap: 4rem;
    align-items: center;
}

.about-visual {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: 1rem;
}

.about-card {
    background: white;
    border: 1px solid var(--border);
    border-radius: var(--radius-lg);
    padding: 1.75rem;
    text-align: center;
    transition: var(--transition);
    position: relative;
    overflow: hidden;
}

.about-card::after {
    content: '';
    position: absolute;
    inset: 0;
    border-radius: var(--radius-lg);
    opacity: 0;
    transition: opacity 0.4s;
    box-shadow: inset 0 0 0 1px rgba(26, 86, 219, 0.06);
    pointer-events: none;
}

.about-card:hover {
    box-shadow: var(--shadow-lg), 0 0 0 1px rgba(26, 86, 219, 0.04);
    transform: translateY(-4px);
    border-color: transparent;
}

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

.about-card .card-icon {
    width: 48px;
    height: 48px;
    margin: 0 auto 0.75rem;
    display: flex;
    align-items: center;
    justify-content: center;
}

.about-card .card-icon svg {
    width: 28px;
    height: 28px;
}

.about-card h4 {
    font-size: 1rem;
    font-weight: 600;
    margin-bottom: 0.5rem;
    color: var(--text);
}

.about-card p {
    color: var(--text-secondary);
    font-size: 0.875rem;
    line-height: 1.5;
}

.card-mission { border-top: 3px solid #3b82f6; }
.card-vision { border-top: 3px solid #f59e0b; }
.card-value { 
    grid-column: span 2; 
    border-top: 3px solid #a855f7;
}

.about-content {
    padding-left: 1rem;
}

.about-content .section-tag {
    margin-bottom: 0.75rem;
}

.about-content .section-title {
    margin-bottom: 1.5rem;
}

.about-content > p {
    color: var(--text-secondary);
    margin-bottom: 1.25rem;
    line-height: 1.8;
}

.about-stats-row {
    display: flex;
    gap: 2.5rem;
    margin-top: 2rem;
    padding-top: 2rem;
    border-top: 1px solid var(--border);
}

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

.about-stat-num {
    display: block;
    font-size: 2rem;
    font-weight: 800;
    color: var(--primary);
    line-height: 1;
}

.about-stat-label {
    font-size: 0.875rem;
    color: var(--text-muted);
    margin-top: 0.375rem;
}

/* ===== CTA ===== */
.cta-section {
    padding: 100px 0;
    background: linear-gradient(135deg, #0d47a1 0%, #1565c0 50%, #0ea5e9 100%);
    position: relative;
    overflow: hidden;
    text-align: center;
}

.cta-section::before {
    content: '';
    position: absolute;
    inset: 0;
    background: url("data:image/svg+xml,%3Csvg width='60' height='60' viewBox='0 0 60 60' xmlns='http://www.w3.org/2000/svg'%3E%3Cg fill='none' fill-rule='evenodd'%3E%3Cg fill='%23ffffff' fill-opacity='0.04'%3E%3Cpath d='M36 34v-4h-2v4h-4v2h4v4h2v-4h4v-2h-4zm0-30V0h-2v4h-4v2h4v4h2V6h4V4h-4zM6 34v-4H4v4H0v2h4v4h2v-4h4v-2H6zM6 4V0H4v4H0v2h4v4h2V6h4V4H6z'/%3E%3C/g%3E%3C/g%3E%3C/svg%3E");
}

.cta-content {
    position: relative;
    z-index: 1;
    max-width: 600px;
    margin: 0 auto;
}

.cta-content h2 {
    font-size: clamp(1.75rem, 3vw, 2.5rem);
    font-weight: 800;
    color: white;
    margin-bottom: 1rem;
}

.cta-content p {
    color: rgba(255, 255, 255, 0.85);
    margin-bottom: 2rem;
    font-size: 1.0625rem;
    line-height: 1.7;
}

/* ===== 联系我们 ===== */
.contact-layout {
    display: flex;
    justify-content: center;
    align-items: start;
}

.contact-info {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 1.25rem;
    max-width: 720px;
    width: 100%;
}

.contact-card {
    display: flex;
    align-items: flex-start;
    gap: 1rem;
    padding: 1.5rem;
    background: white;
    border-radius: var(--radius-lg);
    border: 1px solid var(--border);
    transition: var(--transition);
    position: relative;
    overflow: hidden;
}

.contact-card::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    height: 0;
    background: linear-gradient(90deg, var(--primary), var(--accent));
    transition: height 0.3s ease;
}

.contact-card:hover {
    box-shadow: var(--shadow-lg);
    transform: translateY(-2px);
    border-color: transparent;
}

.contact-card:hover::before {
    height: 3px;
}

.contact-icon {
    width: 44px;
    height: 44px;
    border-radius: var(--radius);
    display: flex;
    align-items: center;
    justify-content: center;
    background: var(--primary-light);
    border: 1px solid #dbeafe;
    flex-shrink: 0;
}

.contact-icon svg {
    width: 22px;
    height: 22px;
    stroke: var(--primary);
}

.contact-detail h4 {
    font-size: 0.9375rem;
    font-weight: 600;
    margin-bottom: 0.25rem;
    color: var(--text);
}

.contact-detail p {
    color: var(--text-secondary);
    font-size: 0.9375rem;
    line-height: 1.5;
}

.contact-card.contact-qr {
    grid-column: span 2;
    align-items: center;
    text-align: center;
    justify-content: center;
    padding: 2rem;
    background: linear-gradient(135deg, #eff6ff, #f0f9ff);
    border: 2px solid #dbeafe;
}

.contact-card.contact-qr .contact-detail h4 {
    font-size: 1.125rem;
    color: var(--primary);
}

.contact-card.contact-qr .contact-detail p {
    font-size: 0.875rem;
    color: var(--text-secondary);
}

.qr-img {
    width: 180px;
    height: 180px;
    margin: 0.75rem 0;
    border-radius: var(--radius);
    border: 2px solid var(--border);
    background: white;
    object-fit: contain;
}

/* ===== Footer ===== */
.footer {
    background: var(--bg-warm);
    color: var(--text-muted);
    padding: 64px 0 32px;
    border-top: 1px solid var(--border);
}

.footer-content {
    display: grid;
    grid-template-columns: 300px 1fr;
    gap: 4rem;
    margin-bottom: 3rem;
}

.footer-logo {
    display: flex;
    align-items: center;
    gap: 10px;
    color: var(--text);
    font-weight: 700;
    font-size: 1.25rem;
    margin-bottom: 1rem;
}

.footer-logo .logo-img {
    width: 40px;
    height: 40px;
    border-radius: 8px;
}

.footer-brand p {
    margin-bottom: 0.5rem;
    color: var(--text-secondary);
}

.footer-slogan {
    color: var(--text-muted);
    font-size: 0.875rem;
}

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

.footer-col h4 {
    color: var(--text);
    font-size: 0.9375rem;
    font-weight: 600;
    margin-bottom: 1rem;
}

.footer-col ul {
    list-style: none;
}

.footer-col li {
    margin-bottom: 0.625rem;
}

.footer-col a {
    color: var(--text-muted);
    text-decoration: none;
    font-size: 0.9375rem;
    transition: color 0.2s;
}

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

.footer-bottom {
    text-align: center;
    padding-top: 2rem;
    border-top: 1px solid var(--border);
}

.footer-bottom p {
    font-size: 0.875rem;
    margin-bottom: 0.25rem;
    color: var(--text-muted);
}

.footer-bottom a {
    color: var(--text-muted);
    text-decoration: none;
    transition: color 0.2s;
}

.footer-bottom a:hover {
    color: var(--primary);
    text-decoration: underline;
}

/* ===== Back to top ===== */
.back-to-top {
    position: fixed;
    bottom: 24px;
    right: 24px;
    width: 48px;
    height: 48px;
    background: linear-gradient(135deg, var(--primary), var(--accent));
    color: white;
    border: none;
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 1.25rem;
    cursor: pointer;
    box-shadow: 0 4px 16px rgba(26, 86, 219, 0.3);
    opacity: 0;
    visibility: hidden;
    transform: translateY(20px);
    transition: var(--transition);
    z-index: 999;
    -webkit-tap-highlight-color: transparent;
}

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

.back-to-top:active {
    transform: scale(0.95);
}

/* ===== 浮动咨询按钮 ===== */
.float-cta {
    position: fixed;
    bottom: 2rem;
    right: 2rem;
    z-index: 999;
    background: linear-gradient(135deg, var(--primary), var(--primary-dark));
    color: white;
    padding: 1rem 1.5rem;
    border-radius: 100px;
    font-weight: 700;
    font-size: 0.9375rem;
    text-decoration: none;
    box-shadow: 0 8px 32px rgba(21, 101, 192, 0.35), 0 0 0 1px rgba(255,255,255,0.1) inset;
    display: flex;
    align-items: center;
    gap: 0.5rem;
    transition: var(--transition);
    animation: floatBounce 3s ease-in-out infinite;
}

.float-cta:hover {
    transform: translateY(-4px) scale(1.05);
    box-shadow: 0 12px 40px rgba(21, 101, 192, 0.45);
}

.float-cta svg {
    width: 20px;
    height: 20px;
}

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

@media (max-width: 768px) {
    .float-cta {
        bottom: 1rem;
        right: 1rem;
        padding: 0.75rem 1rem;
        font-size: 0.875rem;
    }
    .float-cta span {
        display: none;
    }
}

/* ===== 响应式 ===== */
@media (max-width: 768px) {
    .section {
        padding: 70px 0;
    }
    
    .hero {
        padding: 120px 20px 80px;
        min-height: auto;
    }
    
    .hero-title {
        font-size: 2.25rem;
    }
    
    .hero-stats {
        flex-direction: column;
        gap: 0;
    }
    
    .stat-item {
        width: 100%;
        max-width: 200px;
        padding: 1rem;
    }
    
    .stat-item:not(:last-child) {
        border-right: none;
        border-bottom: 1px solid var(--border);
    }
    
    .nav-menu {
        position: fixed;
        top: 68px;
        left: 0;
        right: 0;
        background: rgba(255, 255, 255, 0.98);
        backdrop-filter: blur(20px);
        flex-direction: column;
        padding: 1.5rem;
        gap: 0;
        border-bottom: 1px solid var(--border);
        transform: translateY(-100%);
        opacity: 0;
        visibility: hidden;
        transition: var(--transition);
    }
    
    .nav-menu.active {
        transform: translateY(0);
        opacity: 1;
        visibility: visible;
    }
    
    .nav-menu li {
        border-bottom: 1px solid var(--border-light);
    }
    
    .nav-link {
        display: block;
        padding: 1rem 0;
    }
    
    .nav-toggle {
        display: flex;
    }
    
    .services-grid {
        grid-template-columns: 1fr;
    }
    
    .solution-item {
        grid-template-columns: 1fr;
        gap: 2rem;
    }
    
    .solution-item.reverse {
        direction: ltr;
    }
    
    .solution-highlights {
        grid-template-columns: 1fr;
    }
    
    .solution-pricing {
        flex-direction: column;
    }
    
    .solution-visual {
        min-height: 240px;
        padding: 1.5rem;
    }
    
    .why-grid {
        grid-template-columns: 1fr;
    }
    
    .process-steps {
        flex-direction: column;
        align-items: center;
    }
    
    .step {
        width: 100%;
        max-width: 300px;
    }
    
    .step:not(:last-child)::after {
        display: none;
    }
    
    .step-arrow {
        display: block;
        transform: rotate(90deg);
        margin: 0.5rem 0;
        color: var(--primary);
        font-size: 1.5rem;
    }
    
    .about-layout {
        grid-template-columns: 1fr;
        gap: 3rem;
    }
    
    .about-visual {
        grid-template-columns: 1fr;
    }
    
    .card-value {
        grid-column: span 1;
    }
    
    .about-stats-row {
        flex-direction: column;
        gap: 1.5rem;
    }
    
    .contact-info {
        grid-template-columns: 1fr;
        gap: 0.875rem;
    }
    
    .contact-card {
        padding: 1rem;
    }
    
    .contact-card.contact-qr {
        grid-column: span 1;
        padding: 1.5rem;
    }
    
    .qr-img {
        width: 150px;
        height: 150px;
    }
    
    .footer-content {
        grid-template-columns: 1fr;
        gap: 2rem;
    }
    
    .footer-links {
        grid-template-columns: repeat(2, 1fr);
    }
    
    .cta-section {
        padding: 60px 20px;
    }
}

@media (max-width: 380px) {
    .hero-title {
        font-size: 1.875rem;
    }
    
    .section-title {
        font-size: 1.5rem;
    }
    
    .footer-links {
        grid-template-columns: 1fr;
    }
    
    .about-stats-row {
        flex-direction: column;
        gap: 1rem;
    }
    
    /* FAQ 移动端 */
    .faq-question {
        padding: 1rem;
        font-size: 0.9375rem;
    }
    
    .faq-answer {
        padding: 0 1rem;
    }
    
    .faq-item.active .faq-answer {
        padding: 0 1rem 1rem;
    }
    
    .faq-answer p {
        padding: 0;
        font-size: 0.875rem;
    }
    
    .faq-icon {
        width: 24px;
        height: 24px;
        font-size: 1rem;
    }
}