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

:root {
    --primary: #0066cc;
    --primary-dark: #004fa3;
    --primary-light: #e6f2ff;
    --secondary: #00c8ff;
    --accent: #7c3aed;
    --success: #10b981;
    --text-dark: #0f172a;
    --text-body: #475569;
    --text-light: #94a3b8;
    --bg-white: #ffffff;
    --bg-light: #f8fafc;
    --bg-dark: #0f172a;
    --border: #e2e8f0;
    --shadow-sm: 0 1px 3px rgba(0,0,0,0.08), 0 1px 2px rgba(0,0,0,0.04);
    --shadow-md: 0 4px 16px rgba(0,0,0,0.08), 0 2px 4px rgba(0,0,0,0.04);
    --shadow-lg: 0 20px 40px rgba(0,0,0,0.1), 0 8px 16px rgba(0,0,0,0.06);
    --shadow-xl: 0 30px 60px rgba(0,0,0,0.15);
    --radius-sm: 8px;
    --radius-md: 12px;
    --radius-lg: 20px;
    --radius-xl: 28px;
}

html {
    scroll-behavior: smooth;
}

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

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

/* ========================
   导航栏
======================== */
.navbar {
    background: rgba(255, 255, 255, 0.75);
    backdrop-filter: blur(24px) saturate(180%);
    -webkit-backdrop-filter: blur(24px) saturate(180%);
    box-shadow: 0 1px 0 rgba(0, 0, 0, 0.05), 0 4px 16px rgba(0, 0, 0, 0.04);
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    z-index: 1000;
    transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
    border-bottom: 1px solid rgba(255, 255, 255, 0.3);
}

.navbar.scrolled {
    background: rgba(255, 255, 255, 0.85);
    backdrop-filter: blur(28px) saturate(200%);
    -webkit-backdrop-filter: blur(28px) saturate(200%);
    box-shadow: 0 2px 8px rgba(0, 0, 0, 0.06), 0 8px 24px rgba(0, 0, 0, 0.08);
    border-bottom-color: rgba(0, 0, 0, 0.08);
}

.navbar .container {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 16px 24px;
    max-width: none;
    width: 100%;
    margin: 0;
}

.logo {
    display: flex;
    flex-direction: column;
    cursor: pointer;
    text-decoration: none;
    margin-left: 0;
}

.logo h1 {
    font-size: 26px;
    font-weight: 800;
    color: var(--primary);
    letter-spacing: -0.5px;
    line-height: 1.1;
}

.logo p {
    font-size: 13px;
    color: var(--text-light);
    font-weight: 500;
    letter-spacing: 1px;
}

.nav-menu {
    display: flex;
    list-style: none;
    align-items: center;
    gap: 24px;
}

.nav-menu a {
    text-decoration: none;
    color: var(--text-body);
    font-weight: 500;
    font-size: 17px;
    padding: 12px 16px;
    border-radius: 8px;
    transition: color 0.3s cubic-bezier(0.4, 0, 0.2, 1);
    position: relative;
    overflow: hidden;
}

.nav-menu a::after {
    content: '';
    position: absolute;
    bottom: 2px;
    left: 16px;
    right: 16px;
    height: 3px;
    background: linear-gradient(90deg, #ff7b00, #ff4d00);
    border-radius: 2px;
    transform: scaleX(0);
    transition: transform 0.3s cubic-bezier(0.4, 0, 0.2, 1);
    transform-origin: left;
}

.nav-menu a:hover,
.nav-menu a.active {
    color: var(--primary);
}

.nav-menu a:hover::after,
.nav-menu a.active::after {
    transform: scaleX(1);
    transform-origin: left;
}

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

.menu-toggle span {
    width: 24px;
    height: 2px;
    background-color: var(--text-dark);
    border-radius: 2px;
    transition: 0.3s;
}

/* ========================
   英雄区
======================== */
.hero {
    background: linear-gradient(135deg, #0a1628 0%, #0f2a5e 40%, #0a3d8f 70%, #0066cc 100%);
    color: #fff;
    padding: 140px 0 100px;
    overflow: hidden;
    position: relative;
    min-height: 100vh;
    display: flex;
    align-items: center;
}

.hero-bg-grid {
    position: absolute;
    inset: 0;
    background-image:
        linear-gradient(rgba(255,255,255,0.04) 1px, transparent 1px),
        linear-gradient(90deg, rgba(255,255,255,0.04) 1px, transparent 1px);
    background-size: 60px 60px;
    pointer-events: none;
}

.hero-bg-glow {
    position: absolute;
    width: 600px;
    height: 600px;
    border-radius: 50%;
    background: radial-gradient(circle, rgba(0, 200, 255, 0.15) 0%, transparent 70%);
    top: -100px;
    right: -100px;
    pointer-events: none;
}

.hero-bg-glow2 {
    position: absolute;
    width: 400px;
    height: 400px;
    border-radius: 50%;
    background: radial-gradient(circle, rgba(124, 58, 237, 0.12) 0%, transparent 70%);
    bottom: -50px;
    left: 200px;
    pointer-events: none;
}

.hero .container {
    display: flex;
    justify-content: space-between;
    align-items: center;
    gap: 60px;
    position: relative;
    z-index: 1;
    width: 100%;
}

.hero-badge {
    display: inline-flex;
    align-items: center;
    gap: 8px;
    background: rgba(255,255,255,0.1);
    border: 1px solid rgba(255,255,255,0.2);
    padding: 8px 20px;
    border-radius: 50px;
    font-size: 13px;
    font-weight: 500;
    margin-bottom: 36px;
    color: rgba(255,255,255,0.9);
}

.hero-badge-dot {
    width: 8px;
    height: 8px;
    border-radius: 50%;
    background: #00c8ff;
    animation: blink 2s ease-in-out infinite;
}

@keyframes blink {
    0%, 100% { opacity: 1; }
    50% { opacity: 0.3; }
}

.hero-content {
    flex: 1;
    min-width: 300px;
    padding: 40px 0;
}

.hero-content h2 {
    font-size: 56px;
    font-weight: 800;
    margin-bottom: 28px;
    line-height: 1.15;
    letter-spacing: -1px;
}

.hero-content h2 .highlight {
    background: linear-gradient(135deg, #00c8ff, #7c3aed);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.hero-content > p {
    font-size: 18px;
    margin-bottom: 52px;
    opacity: 0.8;
    line-height: 1.8;
    max-width: 520px;
}

.hero-buttons {
    display: flex;
    gap: 24px;
    flex-wrap: wrap;
    margin-bottom: 72px;
}

.btn {
    display: inline-flex;
    align-items: center;
    gap: 8px;
    padding: 14px 32px;
    text-decoration: none;
    border-radius: 50px;
    font-weight: 600;
    transition: all 0.3s ease;
    border: none;
    cursor: pointer;
    font-size: 15px;
}

.btn.primary {
    background: #fff;
    color: var(--primary);
    box-shadow: 0 4px 20px rgba(255,255,255,0.25);
}

.btn.primary:hover {
    background: #f0f8ff;
    transform: translateY(-2px);
    box-shadow: 0 8px 30px rgba(255,255,255,0.3);
}

.btn.secondary {
    background: rgba(255,255,255,0.1);
    color: #fff;
    border: 1.5px solid rgba(255,255,255,0.3);
    backdrop-filter: blur(10px);
}

.btn.secondary:hover {
    background: rgba(255,255,255,0.2);
    transform: translateY(-2px);
}

.hero-stats {
    display: flex;
    gap: 56px;
    flex-wrap: wrap;
}

.hero-stat-item {
    display: flex;
    flex-direction: column;
}

.hero-stat-value {
    font-size: 28px;
    font-weight: 800;
    color: #fff;
    line-height: 1;
    margin-bottom: 4px;
}

.hero-stat-label {
    font-size: 13px;
    color: rgba(255,255,255,0.6);
}

.hero-visual {
    flex: 1;
    min-width: 300px;
    display: flex;
    align-items: center;
    justify-content: center;
}

.hero-card-group {
    position: relative;
    width: 420px;
    height: 360px;
}

.hero-card {
    position: absolute;
    background: rgba(255,255,255,0.08);
    border: 1px solid rgba(255,255,255,0.15);
    border-radius: var(--radius-lg);
    padding: 24px;
    backdrop-filter: blur(20px);
    transition: transform 0.3s ease;
}

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

.hero-card-main {
    width: 280px;
    top: 20px;
    left: 70px;
    z-index: 3;
    animation: float-card 5s ease-in-out infinite;
}

.hero-card-secondary {
    width: 200px;
    top: 170px;
    left: 0;
    z-index: 2;
    animation: float-card 5s ease-in-out infinite 1s;
}

.hero-card-tertiary {
    width: 180px;
    top: 160px;
    right: 0;
    z-index: 2;
    animation: float-card 5s ease-in-out infinite 2s;
}

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

.hero-card-icon {
    width: 44px;
    height: 44px;
    border-radius: 12px;
    display: flex;
    align-items: center;
    justify-content: center;
    margin-bottom: 14px;
}

.hero-card-icon.blue { background: linear-gradient(135deg, #0066cc, #00c8ff); }
.hero-card-icon.purple { background: linear-gradient(135deg, #7c3aed, #a855f7); }
.hero-card-icon.green { background: linear-gradient(135deg, #10b981, #34d399); }

.hero-card h5 {
    font-size: 14px;
    font-weight: 700;
    color: #fff;
    margin-bottom: 6px;
}

.hero-card p {
    font-size: 12px;
    color: rgba(255,255,255,0.6);
    margin: 0;
    line-height: 1.5;
}

.hero-card-bar {
    margin-top: 14px;
    height: 4px;
    background: rgba(255,255,255,0.15);
    border-radius: 2px;
    overflow: hidden;
}

.hero-card-bar-fill {
    height: 100%;
    border-radius: 2px;
    background: linear-gradient(90deg, #00c8ff, #7c3aed);
    animation: bar-grow 3s ease-out forwards;
}

@keyframes bar-grow {
    from { width: 0; }
    to { width: var(--fill); }
}

/* ========================
   用户头像 & 登录注册模态框 (高科技磨砂玻璃)
======================== */
.user-avatar {
    width: 40px;
    height: 40px;
    border-radius: 50%;
    background: linear-gradient(135deg, rgba(0, 102, 204, 0.1), rgba(124, 58, 237, 0.1));
    border: 1.5px solid rgba(0, 102, 204, 0.3);
    display: flex;
    align-items: center;
    justify-content: center;
    cursor: pointer;
    color: var(--primary);
    transition: all 0.3s ease;
    margin-left: auto;
}

.user-avatar:hover {
    background: linear-gradient(135deg, rgba(0, 102, 204, 0.2), rgba(124, 58, 237, 0.2));
    transform: scale(1.05);
    box-shadow: 0 0 15px rgba(0, 102, 204, 0.3);
}

.auth-modal-overlay {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: rgba(10, 22, 40, 0.4);
    backdrop-filter: blur(8px);
    -webkit-backdrop-filter: blur(8px);
    z-index: 2000;
    display: flex;
    align-items: center;
    justify-content: center;
    opacity: 0;
    visibility: hidden;
    transition: all 0.4s ease;
}

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

.auth-modal {
    position: relative;
    width: 100%;
    max-width: 420px;
    background: rgba(255, 255, 255, 0.1);
    backdrop-filter: blur(20px) saturate(180%);
    -webkit-backdrop-filter: blur(20px) saturate(180%);
    border: 1px solid rgba(255, 255, 255, 0.2);
    border-radius: 24px;
    padding: 40px;
    box-shadow: 0 30px 60px rgba(0, 0, 0, 0.2), inset 0 0 0 1px rgba(255, 255, 255, 0.1);
    transform: translateY(20px) scale(0.95);
    transition: all 0.4s cubic-bezier(0.175, 0.885, 0.32, 1.275);
    overflow: hidden;
}

.auth-modal::before {
    content: '';
    position: absolute;
    top: -50%;
    left: -50%;
    width: 200%;
    height: 200%;
    background: radial-gradient(circle, rgba(255,255,255,0.1) 0%, transparent 60%);
    pointer-events: none;
}

.auth-modal-overlay.active .auth-modal {
    transform: translateY(0) scale(1);
}

.close-modal {
    position: absolute;
    top: 20px;
    right: 20px;
    width: 32px;
    height: 32px;
    border-radius: 50%;
    background: rgba(255, 255, 255, 0.1);
    border: 1px solid rgba(255, 255, 255, 0.2);
    color: #fff;
    font-size: 20px;
    display: flex;
    align-items: center;
    justify-content: center;
    cursor: pointer;
    transition: all 0.3s ease;
    z-index: 10;
}

.close-modal:hover {
    background: rgba(255, 255, 255, 0.2);
    transform: rotate(90deg);
}

.auth-modal-content {
    position: relative;
    width: 100%;
}

.auth-form-container {
    display: none;
    animation: fadeIn 0.4s ease;
}

.auth-form-container.active {
    display: block;
}

@keyframes fadeIn {
    from { opacity: 0; transform: translateY(10px); }
    to { opacity: 1; transform: translateY(0); }
}

.auth-header {
    text-align: center;
    margin-bottom: 32px;
}

.auth-header h2 {
    font-size: 28px;
    font-weight: 800;
    color: #fff;
    margin-bottom: 8px;
    letter-spacing: 0.5px;
}

.auth-header p {
    color: rgba(255, 255, 255, 0.7);
    font-size: 14px;
}

.auth-header p span {
    color: var(--secondary);
    font-weight: 600;
}

.auth-alert {
    padding: 12px 16px;
    border-radius: 8px;
    margin-bottom: 20px;
    font-size: 14px;
    display: none;
    align-items: center;
    gap: 8px;
    animation: fadeIn 0.3s ease;
}

.auth-alert.error {
    display: flex;
    background: rgba(239, 68, 68, 0.1);
    border: 1px solid rgba(239, 68, 68, 0.3);
    color: #fca5a5;
}

.auth-alert.success {
    display: flex;
    background: rgba(16, 185, 129, 0.1);
    border: 1px solid rgba(16, 185, 129, 0.3);
    color: #6ee7b7;
}

.input-group {
    position: relative;
    margin-bottom: 20px;
}

.input-icon {
    position: absolute;
    left: 16px;
    top: 50%;
    transform: translateY(-50%);
    width: 20px;
    height: 20px;
    color: rgba(255, 255, 255, 0.5);
    transition: color 0.3s ease;
}

.input-group input {
    width: 100%;
    padding: 14px 16px 14px 48px;
    background: rgba(0, 0, 0, 0.2);
    border: 1px solid rgba(255, 255, 255, 0.1);
    border-radius: 12px;
    color: #fff;
    font-size: 15px;
    outline: none;
    transition: all 0.3s ease;
}

.input-group input::placeholder {
    color: rgba(255, 255, 255, 0.4);
}

.input-group input:focus {
    border-color: var(--secondary);
    background: rgba(0, 0, 0, 0.3);
    box-shadow: 0 0 0 4px rgba(0, 200, 255, 0.1);
}

.input-group input:focus + .input-icon,
.input-group input:not(:placeholder-shown) + .input-icon {
    color: var(--secondary);
}

.auth-actions {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 24px;
    font-size: 13px;
}

.remember-me {
    display: flex;
    align-items: center;
    gap: 8px;
    color: rgba(255, 255, 255, 0.7);
    cursor: pointer;
}

.remember-me input {
    accent-color: var(--secondary);
    width: 16px;
    height: 16px;
}

.forgot-pwd {
    color: rgba(255, 255, 255, 0.7);
    text-decoration: none;
    transition: color 0.3s ease;
}

.forgot-pwd:hover {
    color: var(--secondary);
}

.auth-submit-btn {
    width: 100%;
    padding: 14px;
    background: linear-gradient(135deg, #0066cc, #7c3aed);
    border: none;
    border-radius: 12px;
    color: #fff;
    font-size: 16px;
    font-weight: 600;
    cursor: pointer;
    transition: all 0.3s ease;
    box-shadow: 0 4px 15px rgba(0, 102, 204, 0.3);
}

.auth-submit-btn:hover {
    transform: translateY(-2px);
    box-shadow: 0 8px 25px rgba(0, 102, 204, 0.4);
    background: linear-gradient(135deg, #0077ee, #8b4bf0);
}

.auth-switch {
    text-align: center;
    margin-top: 24px;
    color: rgba(255, 255, 255, 0.6);
    font-size: 14px;
}

.auth-switch a {
    color: var(--secondary);
    text-decoration: none;
    font-weight: 600;
    transition: color 0.3s ease;
}

.auth-switch a:hover {
    color: #fff;
}

/* ========================
   通用 Section 样式
======================== */
.section-tag {
    display: inline-block;
    background: var(--primary-light);
    color: var(--primary);
    font-size: 12px;
    font-weight: 700;
    letter-spacing: 2px;
    text-transform: uppercase;
    padding: 6px 16px;
    border-radius: 50px;
    margin-bottom: 16px;
}

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

.section-header h3 {
    font-size: 40px;
    font-weight: 800;
    color: var(--text-dark);
    margin-bottom: 14px;
    letter-spacing: -0.5px;
    line-height: 1.2;
}

.section-header p {
    font-size: 17px;
    color: var(--text-body);
    max-width: 540px;
    margin: 0 auto;
    line-height: 1.7;
}

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

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

.about-text h4 {
    font-size: 14px;
    font-weight: 700;
    letter-spacing: 2px;
    text-transform: uppercase;
    color: var(--primary);
    margin-bottom: 16px;
}

.about-text h3 {
    font-size: 36px;
    font-weight: 800;
    color: var(--text-dark);
    margin-bottom: 20px;
    line-height: 1.25;
    letter-spacing: -0.5px;
}

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

.about-features {
    display: flex;
    flex-direction: column;
    gap: 12px;
    margin-top: 28px;
}

.about-feature-item {
    display: flex;
    align-items: center;
    gap: 12px;
    font-size: 15px;
    color: var(--text-body);
    font-weight: 500;
}

.about-feature-item svg {
    flex-shrink: 0;
    color: var(--success);
}

.about-visual {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 16px;
}

.about-stat-card {
    background: var(--bg-light);
    border: 1px solid var(--border);
    border-radius: var(--radius-md);
    padding: 24px;
    text-align: center;
    transition: all 0.3s ease;
}

.about-stat-card:hover {
    border-color: var(--primary);
    box-shadow: var(--shadow-md);
    transform: translateY(-4px);
}

.about-stat-card:first-child {
    background: linear-gradient(135deg, var(--primary), #0052a3);
    border-color: transparent;
    color: white;
}

.about-stat-card h5 {
    font-size: 40px;
    font-weight: 800;
    color: var(--primary);
    line-height: 1;
    margin-bottom: 8px;
}

.about-stat-card:first-child h5 {
    color: #fff;
}

.about-stat-card p {
    font-size: 14px;
    color: var(--text-light);
    margin: 0;
    font-weight: 500;
}

.about-stat-card:first-child p {
    color: rgba(255,255,255,0.75);
}

.about-stat-card.wide {
    grid-column: span 2;
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 16px;
    text-align: left;
    padding: 20px 24px;
}

.about-stat-card.wide h5 {
    font-size: 32px;
    margin: 0;
}

.about-stat-card.wide p {
    margin: 0;
}

/* ========================
   核心服务
======================== */
.services {
    padding: 100px 0;
    background-color: var(--bg-light);
}

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

.service-card {
    background: var(--bg-white);
    padding: 44px;
    border-radius: var(--radius-lg);
    border: 1px solid var(--border);
    box-shadow: var(--shadow-sm);
    transition: all 0.3s ease;
    position: relative;
}

.service-card:hover {
    transform: translateY(-8px);
    box-shadow: var(--shadow-lg);
    border-color: var(--primary);
}

.service-icon {
    width: 64px;
    height: 64px;
    border-radius: var(--radius-md);
    display: flex;
    align-items: center;
    justify-content: center;
    margin-bottom: 28px;
}

.service-icon.agent {
    background: linear-gradient(135deg, #dbeafe, #bfdbfe);
    color: var(--primary);
}

.service-icon.iot {
    background: linear-gradient(135deg, #d1fae5, #a7f3d0);
    color: #059669;
}

.service-card h4 {
    font-size: 22px;
    font-weight: 700;
    color: var(--text-dark);
    margin-bottom: 14px;
    letter-spacing: -0.3px;
}

.service-card > p {
    color: var(--text-body);
    margin-bottom: 24px;
    line-height: 1.75;
    font-size: 15px;
}

.service-card ul {
    list-style: none;
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 8px;
}

.service-card ul li {
    color: var(--text-body);
    font-size: 14px;
    padding-left: 20px;
    position: relative;
    font-weight: 500;
}

.service-card ul li::before {
    content: "▸";
    position: absolute;
    left: 0;
    color: var(--primary);
    font-size: 12px;
}

/* ========================
   技术优势
======================== */
.technologies {
    padding: 100px 0;
    background-color: var(--bg-white);
}

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

.tech-card {
    padding: 32px;
    border-radius: var(--radius-md);
    border: 1px solid var(--border);
    transition: all 0.3s ease;
    position: relative;
    overflow: hidden;
    background: var(--bg-white);
}

.tech-card::after {
    content: '';
    position: absolute;
    inset: 0;
    background: linear-gradient(135deg, transparent, rgba(0,102,204,0.03));
    opacity: 0;
    transition: opacity 0.3s ease;
}

.tech-card:hover {
    border-color: var(--primary);
    transform: translateY(-6px);
    box-shadow: var(--shadow-md);
}

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

.tech-icon {
    width: 56px;
    height: 56px;
    border-radius: var(--radius-sm);
    display: flex;
    align-items: center;
    justify-content: center;
    margin-bottom: 20px;
}

.tech-icon.ai { background: linear-gradient(135deg, #dbeafe, #93c5fd); color: var(--primary); }
.tech-icon.data { background: linear-gradient(135deg, #fce7f3, #fbcfe8); color: #db2777; }
.tech-icon.edge { background: linear-gradient(135deg, #ede9fe, #ddd6fe); color: #7c3aed; }
.tech-icon.iot { background: linear-gradient(135deg, #d1fae5, #6ee7b7); color: #059669; }
.tech-icon.chain { background: linear-gradient(135deg, #fef3c7, #fde68a); color: #d97706; }
.tech-icon.cloud { background: linear-gradient(135deg, #e0f2fe, #7dd3fc); color: #0284c7; }

.tech-card h4 {
    font-size: 17px;
    font-weight: 700;
    color: var(--text-dark);
    margin-bottom: 10px;
}

.tech-card p {
    color: var(--text-body);
    font-size: 14px;
    line-height: 1.7;
}

/* ========================
   产品中心
======================== */
.products {
    padding: 100px 0;
    background: var(--bg-light);
}

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

.product-card {
    background: var(--bg-white);
    border-radius: var(--radius-md);
    overflow: hidden;
    border: 1px solid var(--border);
    box-shadow: var(--shadow-sm);
    transition: all 0.3s ease;
}

.product-card:hover {
    transform: translateY(-8px);
    box-shadow: var(--shadow-lg);
    border-color: transparent;
}

.product-image {
    height: 180px;
    display: flex;
    align-items: center;
    justify-content: center;
    position: relative;
    overflow: hidden;
}

.product-image.blue { background: linear-gradient(135deg, #dbeafe, #bfdbfe); }
.product-image.green { background: linear-gradient(135deg, #d1fae5, #a7f3d0); }
.product-image.purple { background: linear-gradient(135deg, #ede9fe, #ddd6fe); }
.product-image.orange { background: linear-gradient(135deg, #fef3c7, #fed7aa); }

.product-icon-wrap {
    width: 72px;
    height: 72px;
    border-radius: var(--radius-md);
    background: rgba(255,255,255,0.7);
    display: flex;
    align-items: center;
    justify-content: center;
    box-shadow: var(--shadow-md);
    transition: transform 0.3s ease;
}

.product-card:hover .product-icon-wrap {
    transform: scale(1.1);
}

.product-info {
    padding: 20px;
}

.product-tag {
    display: inline-block;
    font-size: 11px;
    font-weight: 700;
    letter-spacing: 1px;
    text-transform: uppercase;
    color: var(--primary);
    background: var(--primary-light);
    padding: 3px 10px;
    border-radius: 50px;
    margin-bottom: 10px;
}

.product-info h4 {
    font-size: 16px;
    font-weight: 700;
    color: var(--text-dark);
    margin-bottom: 8px;
    line-height: 1.4;
}

.product-info p {
    color: var(--text-body);
    margin-bottom: 16px;
    font-size: 13px;
    line-height: 1.6;
}

.btn-link {
    color: var(--primary);
    text-decoration: none;
    font-weight: 600;
    font-size: 14px;
    transition: all 0.2s ease;
    display: inline-flex;
    align-items: center;
    gap: 4px;
}

.btn-link:hover {
    color: var(--primary-dark);
    gap: 8px;
}

/* ========================
   新闻资讯
======================== */
.news {
    padding: 100px 0;
    background-color: var(--bg-white);
}

.news-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 28px;
}

.news-card {
    border-radius: var(--radius-md);
    border: 1px solid var(--border);
    overflow: hidden;
    background: var(--bg-white);
    transition: all 0.3s ease;
}

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

.news-card-body {
    padding: 28px;
}

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

.news-category {
    font-size: 11px;
    font-weight: 700;
    letter-spacing: 1px;
    text-transform: uppercase;
    padding: 3px 10px;
    border-radius: 50px;
}

.news-category.product { background: var(--primary-light); color: var(--primary); }
.news-category.industry { background: #ede9fe; color: #7c3aed; }
.news-category.award { background: #fef3c7; color: #d97706; }

.news-date {
    font-size: 12px;
    color: var(--text-light);
    font-weight: 500;
}

.news-card h4 {
    font-size: 17px;
    font-weight: 700;
    color: var(--text-dark);
    margin-bottom: 12px;
    line-height: 1.5;
}

.news-card p {
    color: var(--text-body);
    margin-bottom: 20px;
    font-size: 14px;
    line-height: 1.7;
}

/* ========================
   页脚
======================== */
.footer {
    background: var(--bg-dark);
    color: #fff;
    padding: 80px 0 32px;
}

.footer-content {
    display: grid;
    grid-template-columns: 1.5fr 1fr 1fr 1fr;
    gap: 48px;
    margin-bottom: 56px;
    padding-bottom: 56px;
    border-bottom: 1px solid rgba(255,255,255,0.08);
}

.footer-brand h3 {
    font-size: 26px;
    font-weight: 800;
    color: #fff;
    margin-bottom: 4px;
    letter-spacing: -0.3px;
}

.footer-brand .brand-sub {
    font-size: 13px;
    color: rgba(255,255,255,0.4);
    font-weight: 500;
    letter-spacing: 1px;
    margin-bottom: 16px;
}

.footer-brand p {
    color: rgba(255,255,255,0.5);
    font-size: 14px;
    line-height: 1.7;
    margin-bottom: 0;
}

.footer-col h5 {
    font-size: 14px;
    font-weight: 700;
    color: rgba(255,255,255,0.9);
    margin-bottom: 20px;
    letter-spacing: 0.5px;
}

.footer-col ul {
    list-style: none;
    display: flex;
    flex-direction: column;
    gap: 10px;
}

.footer-col ul li a {
    color: rgba(255,255,255,0.45);
    text-decoration: none;
    font-size: 14px;
    transition: color 0.2s ease;
}

.footer-col ul li a:hover {
    color: rgba(255,255,255,0.9);
}

.footer-bottom {
    display: flex;
    justify-content: space-between;
    align-items: center;
    flex-wrap: wrap;
    gap: 16px;
}

.copyright {
    color: rgba(255,255,255,0.35);
    font-size: 13px;
    line-height: 1.6;
}

.social-links {
    display: flex;
    gap: 10px;
}

.social-icon {
    width: 36px;
    height: 36px;
    border-radius: 8px;
    background: rgba(255,255,255,0.06);
    border: 1px solid rgba(255,255,255,0.1);
    color: rgba(255,255,255,0.5);
    display: flex;
    align-items: center;
    justify-content: center;
    text-decoration: none;
    transition: all 0.2s ease;
    font-size: 14px;
    font-weight: 700;
}

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

/* ========================
   回到顶部按钮
======================== */
.back-to-top {
    position: fixed;
    bottom: 32px;
    right: 32px;
    width: 44px;
    height: 44px;
    border-radius: 12px;
    background: var(--primary);
    color: #fff;
    border: none;
    cursor: pointer;
    display: flex;
    align-items: center;
    justify-content: center;
    box-shadow: 0 4px 20px rgba(0,102,204,0.4);
    transition: all 0.3s ease;
    opacity: 0;
    pointer-events: none;
    z-index: 999;
}

.back-to-top.visible {
    opacity: 1;
    pointer-events: auto;
}

.back-to-top:hover {
    background: var(--primary-dark);
    transform: translateY(-3px);
    box-shadow: 0 8px 24px rgba(0,102,204,0.5);
}

/* ========================
   分割线装饰
======================== */
.section-divider {
    width: 48px;
    height: 4px;
    background: linear-gradient(90deg, var(--primary), var(--secondary));
    border-radius: 2px;
    margin: 0 auto 24px;
}

/* ========================
   响应式设计
======================== */
@media (max-width: 1024px) {
    .products-grid {
        grid-template-columns: repeat(2, 1fr);
    }

    .tech-grid {
        grid-template-columns: repeat(2, 1fr);
    }

    .hero-card-group {
        display: none;
    }

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

@media (max-width: 768px) {
    .nav-menu {
        display: none;
        flex-direction: column;
        position: absolute;
        top: 100%;
        left: 0;
        right: 0;
        background: rgba(255, 255, 255, 0.95);
        backdrop-filter: blur(20px);
        -webkit-backdrop-filter: blur(20px);
        box-shadow: 0 8px 32px rgba(0, 0, 0, 0.12);
        padding: 16px;
        border-top: 1px solid rgba(0, 0, 0, 0.08);
        gap: 0;
    }

    .nav-menu.active {
        display: flex;
    }

    .nav-menu li {
        margin: 0;
    }

    .nav-menu a {
        padding: 12px 16px;
        border-radius: 8px;
        display: block;
    }

    .menu-toggle {
        display: flex;
        touch-action: manipulation;
        -webkit-tap-highlight-color: transparent;
    }

    .hero {
        padding: 120px 0 80px;
        min-height: auto;
    }

    .hero .container {
        flex-direction: column;
        gap: 40px;
    }

    .hero-content h2 {
        font-size: 36px;
    }

    .hero-stats {
        gap: 24px;
    }

    .about-content {
        grid-template-columns: 1fr;
        gap: 40px;
    }

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

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

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

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

    .section-header h3 {
        font-size: 30px;
    }

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

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

    .back-to-top {
        bottom: 20px;
        right: 20px;
    }
}

@media (max-width: 480px) {
    .hero-content h2 {
        font-size: 30px;
    }

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

    .tech-grid,
    .products-grid {
        grid-template-columns: 1fr;
    }

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

    .about-visual {
        grid-template-columns: 1fr 1fr;
    }
}