/* ================================
   全局变量与重置
   ================================ */
:root {
    --primary: #0EA5E9;
    --primary-dark: #0284C7;
    --primary-darker: #0369A1;
    --primary-light: #E0F2FE;
    --bg: #F8FAFC;
    --bg-white: #FFFFFF;
    --text: #1E293B;
    --text-light: #64748B;
    --text-lighter: #94A3B8;
    --border: #E2E8F0;
    --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 32px rgba(0,0,0,0.08);
    --shadow-xl: 0 24px 48px rgba(14,165,233,0.12);
    --radius: 12px;
    --radius-lg: 20px;
    --radius-xl: 28px;
    --transition: 0.3s cubic-bezier(0.4, 0, 0.2, 1);
    --max-width: 1200px;
    --nav-height: 70px;
}

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

html {
    scroll-behavior: smooth;
    scroll-padding-top: var(--nav-height);
}

body {
    font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", "PingFang SC",
                 "Hiragino Sans GB", "Microsoft YaHei", sans-serif;
    color: var(--text);
    background: var(--bg);
    line-height: 1.6;
    overflow-x: hidden;
}

a { color: inherit; text-decoration: none; }
ul { list-style: none; }
img { max-width: 100%; display: block; }

.container {
    max-width: var(--max-width);
    margin: 0 auto;
    padding: 0 24px;
}

/* ================================
   按钮系统
   ================================ */
.btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: 8px;
    padding: 10px 24px;
    border-radius: var(--radius);
    font-size: 15px;
    font-weight: 600;
    cursor: pointer;
    border: none;
    transition: all var(--transition);
    white-space: nowrap;
}

.btn-sm { padding: 8px 18px; font-size: 14px; }
.btn-lg { padding: 14px 32px; font-size: 16px; }
.btn-block { width: 100%; }

.btn-primary {
    background: linear-gradient(135deg, var(--primary), var(--primary-dark));
    color: #fff;
    box-shadow: 0 4px 14px rgba(14,165,233,0.35);
}
.btn-primary:hover {
    transform: translateY(-2px);
    box-shadow: 0 8px 24px rgba(14,165,233,0.45);
}

.btn-outline {
    background: transparent;
    color: var(--primary-dark);
    border: 1.5px solid var(--primary);
}
.btn-outline:hover {
    background: var(--primary);
    color: #fff;
}

.btn-glass {
    background: rgba(255,255,255,0.7);
    backdrop-filter: blur(12px);
    color: var(--text);
    border: 1px solid rgba(255,255,255,0.8);
    box-shadow: var(--shadow);
}
.btn-glass:hover {
    background: rgba(255,255,255,0.9);
    transform: translateY(-2px);
}

/* ================================
   导航栏
   ================================ */
.navbar {
    position: fixed;
    top: 0; left: 0; right: 0;
    height: var(--nav-height);
    background: rgba(255,255,255,0.8);
    backdrop-filter: blur(20px) saturate(180%);
    border-bottom: 1px solid transparent;
    z-index: 1000;
    transition: all var(--transition);
}
.navbar.scrolled {
    background: rgba(255,255,255,0.95);
    border-bottom-color: var(--border);
    box-shadow: var(--shadow-sm);
}

.nav-container {
    max-width: var(--max-width);
    height: 100%;
    margin: 0 auto;
    padding: 0 24px;
    display: flex;
    align-items: center;
    justify-content: space-between;
}

.nav-logo {
    display: flex;
    align-items: center;
    gap: 10px;
    font-size: 18px;
    font-weight: 700;
    color: var(--text);
}
.logo-icon { width: 36px; height: 36px; }

.nav-menu {
    display: flex;
    gap: 4px;
}
.nav-link {
    padding: 8px 16px;
    border-radius: 8px;
    font-size: 15px;
    font-weight: 500;
    color: var(--text-light);
    transition: all var(--transition);
}
.nav-link:hover, .nav-link.active {
    color: var(--primary-dark);
    background: var(--primary-light);
}

.nav-actions {
    display: flex;
    gap: 10px;
}

.nav-toggle {
    display: none;
    flex-direction: column;
    gap: 5px;
    background: none;
    border: none;
    cursor: pointer;
    padding: 8px;
}
.nav-toggle span {
    width: 24px;
    height: 2px;
    background: var(--text);
    border-radius: 2px;
    transition: all var(--transition);
}
.nav-toggle.open span:nth-child(1) { transform: rotate(45deg) translate(5px, 5px); }
.nav-toggle.open span:nth-child(2) { opacity: 0; }
.nav-toggle.open span:nth-child(3) { transform: rotate(-45deg) translate(5px, -5px); }

/* ================================
   Hero 区域
   ================================ */
.hero {
    position: relative;
    min-height: 100vh;
    display: flex;
    align-items: center;
    overflow: hidden;
    padding-top: var(--nav-height);
}

.hero-bg {
    position: absolute;
    inset: 0;
    background: linear-gradient(180deg, #F0F9FF 0%, #E0F2FE 40%, var(--bg) 100%);
}

.hero-grid {
    position: absolute;
    inset: 0;
    background-image:
        linear-gradient(rgba(14,165,233,0.06) 1px, transparent 1px),
        linear-gradient(90deg, rgba(14,165,233,0.06) 1px, transparent 1px);
    background-size: 48px 48px;
    mask-image: radial-gradient(ellipse 80% 60% at 50% 40%, #000 30%, transparent 80%);
}

.hero-glow {
    position: absolute;
    width: 600px;
    height: 600px;
    border-radius: 50%;
    background: radial-gradient(circle, rgba(14,165,233,0.15), transparent 70%);
    top: -100px;
    right: -100px;
    filter: blur(40px);
}

.hero-container {
    position: relative;
    max-width: var(--max-width);
    margin: 0 auto;
    padding: 0 24px;
    width: 100%;
}

.hero-content { max-width: 720px; }

.hero-badge {
    display: inline-flex;
    align-items: center;
    gap: 8px;
    padding: 8px 18px;
    background: rgba(14,165,233,0.1);
    border: 1px solid rgba(14,165,233,0.2);
    border-radius: 100px;
    font-size: 14px;
    color: var(--primary-dark);
    font-weight: 500;
    margin-bottom: 24px;
}
.badge-dot {
    width: 8px; height: 8px;
    background: var(--primary);
    border-radius: 50%;
    animation: pulse 2s infinite;
}
@keyframes pulse {
    0%, 100% { opacity: 1; }
    50% { opacity: 0.4; }
}

.hero-title {
    font-size: 56px;
    font-weight: 800;
    line-height: 1.15;
    letter-spacing: -1px;
    margin-bottom: 24px;
    color: var(--text);
}
.gradient-text {
    background: linear-gradient(135deg, var(--primary), var(--primary-darker));
    -webkit-background-clip: text;
    background-clip: text;
    -webkit-text-fill-color: transparent;
}

.hero-desc {
    font-size: 18px;
    color: var(--text-light);
    line-height: 1.7;
    margin-bottom: 36px;
}

.hero-actions {
    display: flex;
    gap: 16px;
    margin-bottom: 60px;
    flex-wrap: wrap;
}

.hero-stats {
    display: flex;
    gap: 48px;
    flex-wrap: wrap;
}
.stat-item .stat-num {
    font-size: 32px;
    font-weight: 800;
    color: var(--primary-dark);
    line-height: 1.2;
}
.stat-item .stat-label {
    font-size: 14px;
    color: var(--text-lighter);
    margin-top: 4px;
}

.scroll-indicator {
    position: absolute;
    bottom: 30px;
    left: 50%;
    transform: translateX(-50%);
    text-align: center;
    color: var(--text-lighter);
    font-size: 13px;
}
.scroll-arrow {
    width: 24px;
    height: 40px;
    border: 2px solid var(--text-lighter);
    border-radius: 14px;
    margin: 8px auto 0;
    position: relative;
}
.scroll-arrow::after {
    content: '';
    position: absolute;
    top: 8px; left: 50%;
    transform: translateX(-50%);
    width: 4px; height: 8px;
    background: var(--text-lighter);
    border-radius: 2px;
    animation: scroll-bounce 2s infinite;
}
@keyframes scroll-bounce {
    0%, 100% { transform: translateX(-50%) translateY(0); opacity: 1; }
    50% { transform: translateX(-50%) translateY(10px); opacity: 0.3; }
}

/* ================================
   通用 Section
   ================================ */
.section {
    padding: 100px 0;
}

.section-header {
    text-align: center;
    margin-bottom: 60px;
}
.section-tag {
    display: inline-block;
    padding: 6px 16px;
    background: var(--primary-light);
    color: var(--primary-dark);
    border-radius: 100px;
    font-size: 14px;
    font-weight: 600;
    margin-bottom: 16px;
}
.section-title {
    font-size: 40px;
    font-weight: 800;
    color: var(--text);
    letter-spacing: -0.5px;
    margin-bottom: 12px;
}
.section-desc {
    font-size: 17px;
    color: var(--text-light);
}

/* ================================
   解决方案卡片
   ================================ */
.solutions-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 24px;
}

.solution-card {
    background: var(--bg-white);
    border: 1px solid var(--border);
    border-radius: var(--radius-lg);
    padding: 36px 32px;
    transition: all var(--transition);
    position: relative;
    overflow: hidden;
}
.solution-card::before {
    content: '';
    position: absolute;
    top: 0; left: 0; right: 0;
    height: 3px;
    background: linear-gradient(90deg, var(--primary), var(--primary-dark));
    transform: scaleX(0);
    transform-origin: left;
    transition: transform var(--transition);
}
.solution-card:hover {
    transform: translateY(-6px);
    box-shadow: var(--shadow-xl);
    border-color: transparent;
}
.solution-card:hover::before { transform: scaleX(1); }

.card-icon {
    width: 56px; height: 56px;
    border-radius: 14px;
    display: flex;
    align-items: center;
    justify-content: center;
    margin-bottom: 20px;
}
.card-icon svg { width: 28px; height: 28px; }
.icon-blue   { background: #E0F2FE; color: #0284C7; }
.icon-green  { background: #DCFCE7; color: #16A34A; }
.icon-purple { background: #F3E8FF; color: #9333EA; }
.icon-orange { background: #FFEDD5; color: #EA580C; }
.icon-cyan   { background: #CFFAFE; color: #0891B2; }
.icon-red    { background: #FEE2E2; color: #DC2626; }

.solution-card h3 {
    font-size: 22px;
    font-weight: 700;
    margin-bottom: 12px;
}
.solution-card > p {
    color: var(--text-light);
    margin-bottom: 20px;
    line-height: 1.6;
}
.card-features li {
    padding: 6px 0;
    font-size: 14px;
    color: var(--text-light);
    display: flex;
    align-items: center;
    gap: 8px;
}
.card-features li::before {
    content: '';
    width: 6px; height: 6px;
    border-radius: 50%;
    background: var(--primary);
    flex-shrink: 0;
}

/* ================================
   技术架构
   ================================ */
.tech { background: var(--bg-white); }

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

.tech-diagram { display: flex; flex-direction: column; gap: 0; }

.tech-layer {
    background: var(--bg);
    border: 1px solid var(--border);
    border-radius: var(--radius);
    padding: 20px 24px;
    position: relative;
}
.layer-label {
    font-size: 13px;
    font-weight: 700;
    color: var(--primary-dark);
    margin-bottom: 12px;
    text-transform: uppercase;
    letter-spacing: 1px;
}
.layer-items {
    display: flex;
    flex-wrap: wrap;
    gap: 8px;
}
.tech-tag {
    padding: 5px 14px;
    background: var(--bg-white);
    border: 1px solid var(--border);
    border-radius: 100px;
    font-size: 13px;
    color: var(--text);
    font-weight: 500;
}
.tech-arrow {
    width: 2px;
    height: 20px;
    background: var(--border);
    margin: 0 auto;
    position: relative;
}
.tech-arrow::after {
    content: '';
    position: absolute;
    bottom: -2px; left: 50%;
    transform: translateX(-50%);
    width: 0; height: 0;
    border-left: 5px solid transparent;
    border-right: 5px solid transparent;
    border-top: 6px solid var(--border);
}

.tech-features { display: flex; flex-direction: column; gap: 28px; }
.feature-item {
    display: flex;
    gap: 18px;
    align-items: flex-start;
}
.feature-icon {
    width: 48px; height: 48px;
    min-width: 48px;
    border-radius: 12px;
    background: var(--primary-light);
    color: var(--primary-dark);
    display: flex;
    align-items: center;
    justify-content: center;
}
.feature-icon svg { width: 24px; height: 24px; }
.feature-item h4 {
    font-size: 18px;
    font-weight: 700;
    margin-bottom: 6px;
}
.feature-item p {
    font-size: 14px;
    color: var(--text-light);
    line-height: 1.6;
}

/* ================================
   客户案例
   ================================ */
.cases-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 28px;
}
.case-card {
    background: var(--bg-white);
    border-radius: var(--radius-lg);
    overflow: hidden;
    box-shadow: var(--shadow);
    transition: all var(--transition);
}
.case-card:hover {
    transform: translateY(-6px);
    box-shadow: var(--shadow-xl);
}
.case-image {
    height: 180px;
    background: linear-gradient(135deg, var(--primary-light), #BAE6FD);
    display: flex;
    align-items: center;
    justify-content: center;
}
.case-placeholder {
    font-size: 20px;
    font-weight: 700;
    color: var(--primary-dark);
    opacity: 0.5;
}
.case-body { padding: 28px 24px; }
.case-tag {
    display: inline-block;
    padding: 4px 12px;
    background: var(--primary-light);
    color: var(--primary-dark);
    border-radius: 100px;
    font-size: 13px;
    font-weight: 600;
    margin-bottom: 12px;
}
.case-body h3 {
    font-size: 20px;
    font-weight: 700;
    margin-bottom: 10px;
}
.case-body > p {
    color: var(--text-light);
    font-size: 15px;
    margin-bottom: 20px;
    line-height: 1.6;
}
.case-metrics {
    display: flex;
    gap: 32px;
    padding-top: 20px;
    border-top: 1px solid var(--border);
}
.case-metrics div { text-align: center; flex: 1; }
.case-metrics strong {
    display: block;
    font-size: 24px;
    font-weight: 800;
    color: var(--primary-dark);
}
.case-metrics span {
    font-size: 13px;
    color: var(--text-lighter);
}

/* ================================
   关于我们
   ================================ */
.about { background: var(--bg-white); }
.about-layout {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 60px;
    align-items: center;
}
.about-text {
    font-size: 16px;
    color: var(--text-light);
    line-height: 1.8;
    margin-bottom: 20px;
}
.about-values {
    display: flex;
    gap: 32px;
    margin-top: 32px;
}
.value-item {
    display: flex;
    align-items: center;
    gap: 10px;
    font-weight: 600;
    color: var(--text);
}
.value-icon {
    width: 40px; height: 40px;
    border-radius: 10px;
    background: var(--primary-light);
    color: var(--primary-dark);
    display: flex;
    align-items: center;
    justify-content: center;
}
.value-icon svg { width: 20px; height: 20px; }

.visual-card {
    background: #1E293B;
    border-radius: var(--radius-lg);
    overflow: hidden;
    box-shadow: var(--shadow-lg);
}
.visual-header {
    display: flex;
    gap: 8px;
    padding: 16px 20px;
    background: #0F172A;
}
.visual-dot {
    width: 12px; height: 12px;
    border-radius: 50%;
}
.visual-dot.red { background: #EF4444; }
.visual-dot.yellow { background: #F59E0B; }
.visual-dot.green { background: #10B981; }
.visual-code {
    padding: 24px;
    overflow-x: auto;
}
.visual-code pre {
    font-family: "Fira Code", "Cascadia Code", Consolas, monospace;
    font-size: 14px;
    line-height: 1.7;
}
.code-comment { color: #64748B; }
.code-keyword { color: #C084FC; }
.code-type { color: #38BDF8; }

/* ================================
   联系我们
   ================================ */
.contact { background: var(--bg); }
.contact-layout {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 60px;
}
.contact-info { display: flex; flex-direction: column; gap: 28px; }
.contact-item {
    display: flex;
    gap: 18px;
    align-items: flex-start;
    background: var(--bg-white);
    padding: 24px;
    border-radius: var(--radius);
    border: 1px solid var(--border);
    transition: all var(--transition);
}
.contact-item:hover {
    border-color: var(--primary);
    box-shadow: var(--shadow);
}
.contact-icon {
    width: 48px; height: 48px;
    min-width: 48px;
    border-radius: 12px;
    background: var(--primary-light);
    color: var(--primary-dark);
    display: flex;
    align-items: center;
    justify-content: center;
}
.contact-icon svg { width: 24px; height: 24px; }
.contact-label {
    font-size: 13px;
    color: var(--text-lighter);
    margin-bottom: 4px;
}
.contact-value {
    font-size: 17px;
    font-weight: 600;
    color: var(--text);
}

.contact-form-wrap {
    background: var(--bg-white);
    padding: 36px;
    border-radius: var(--radius-lg);
    border: 1px solid var(--border);
    box-shadow: var(--shadow);
}
.form-row {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 16px;
}
.form-group { margin-bottom: 18px; }
.form-group label {
    display: block;
    font-size: 14px;
    font-weight: 600;
    margin-bottom: 8px;
    color: var(--text);
}
.form-group input,
.form-group textarea {
    width: 100%;
    padding: 12px 16px;
    border: 1.5px solid var(--border);
    border-radius: var(--radius);
    font-size: 15px;
    font-family: inherit;
    transition: border-color var(--transition);
    background: var(--bg);
}
.form-group input:focus,
.form-group textarea:focus {
    outline: none;
    border-color: var(--primary);
    background: var(--bg-white);
}
.form-tip {
    text-align: center;
    margin-top: 12px;
    font-size: 14px;
    color: var(--primary-dark);
    min-height: 20px;
}

/* ================================
   页脚
   ================================ */
.footer {
    background: #0F172A;
    color: #CBD5E1;
    padding: 60px 0 30px;
}
.footer-grid {
    display: grid;
    grid-template-columns: 2fr 1fr 1fr 1fr;
    gap: 40px;
    margin-bottom: 40px;
}
.footer-logo {
    display: flex;
    align-items: center;
    gap: 10px;
    font-size: 18px;
    font-weight: 700;
    color: #fff;
    margin-bottom: 16px;
}
.footer-desc {
    font-size: 14px;
    color: #94A3B8;
    line-height: 1.6;
}
.footer-col h4 {
    color: #fff;
    font-size: 15px;
    font-weight: 700;
    margin-bottom: 16px;
}
.footer-col ul li {
    margin-bottom: 10px;
}
.footer-col a {
    font-size: 14px;
    color: #94A3B8;
    transition: color var(--transition);
}
.footer-col a:hover { color: var(--primary); }
.footer-bottom {
    padding-top: 24px;
    border-top: 1px solid rgba(255,255,255,0.1);
    text-align: center;
    font-size: 13px;
    color: #64748B;
}

/* ================================
   返回顶部
   ================================ */
.back-to-top {
    position: fixed;
    bottom: 30px; right: 30px;
    width: 48px; height: 48px;
    border-radius: 50%;
    background: linear-gradient(135deg, var(--primary), var(--primary-dark));
    color: #fff;
    border: none;
    cursor: pointer;
    display: flex;
    align-items: center;
    justify-content: center;
    box-shadow: var(--shadow-lg);
    opacity: 0;
    visibility: hidden;
    transform: translateY(20px);
    transition: all var(--transition);
    z-index: 999;
}
.back-to-top.show {
    opacity: 1;
    visibility: visible;
    transform: translateY(0);
}
.back-to-top:hover { transform: translateY(-4px); }
.back-to-top svg { width: 22px; height: 22px; }

/* ================================
   滚动揭示动画
   ================================ */
[data-reveal] {
    opacity: 0;
    transform: translateY(30px);
    transition: opacity 0.6s ease, transform 0.6s ease;
}
[data-reveal].revealed {
    opacity: 1;
    transform: translateY(0);
}

/* ================================
   响应式
   ================================ */
@media (max-width: 968px) {
    .solutions-grid,
    .cases-grid { grid-template-columns: repeat(2, 1fr); }

    .tech-layout,
    .about-layout,
    .contact-layout { grid-template-columns: 1fr; gap: 40px; }

    .footer-grid { grid-template-columns: 1fr 1fr; }

    .hero-title { font-size: 40px; }
    .section-title { font-size: 32px; }
    .section { padding: 70px 0; }
}

@media (max-width: 640px) {
    .nav-menu {
        position: fixed;
        top: var(--nav-height); left: 0; right: 0;
        flex-direction: column;
        background: rgba(255,255,255,0.98);
        backdrop-filter: blur(20px);
        padding: 20px;
        gap: 4px;
        border-bottom: 1px solid var(--border);
        transform: translateY(-150%);
        transition: transform var(--transition);
    }
    .nav-menu.open { transform: translateY(0); }
    .nav-actions { display: none; }
    .nav-toggle { display: flex; }

    .solutions-grid,
    .cases-grid { grid-template-columns: 1fr; }

    .footer-grid { grid-template-columns: 1fr; }

    .hero-title { font-size: 32px; }
    .hero-desc { font-size: 16px; }
    .hero-stats { gap: 24px; }
    .stat-item .stat-num { font-size: 24px; }

    .form-row { grid-template-columns: 1fr; }
    .section-title { font-size: 26px; }
    .section { padding: 50px 0; }
}