/* ============================================
   湖南达飞嘉乐智能科技有限公司 - 官网样式
   ============================================ */

/* CSS 变量 */
:root {
    --primary-color: #1a56db;
    --primary-dark: #1e40af;
    --primary-light: #3b82f6;
    --secondary-color: #0f172a;
    --accent-color: #06b6d4;
    --gradient-start: #1a56db;
    --gradient-end: #06b6d4;
    --text-primary: #1e293b;
    --text-secondary: #64748b;
    --text-light: #94a3b8;
    --bg-primary: #ffffff;
    --bg-secondary: #f8fafc;
    --bg-dark: #0f172a;
    --border-color: #e2e8f0;
    --shadow-sm: 0 1px 2px 0 rgb(0 0 0 / 0.05);
    --shadow-md: 0 4px 6px -1px rgb(0 0 0 / 0.1), 0 2px 4px -2px rgb(0 0 0 / 0.1);
    --shadow-lg: 0 10px 15px -3px rgb(0 0 0 / 0.1), 0 4px 6px -4px rgb(0 0 0 / 0.1);
    --shadow-xl: 0 20px 25px -5px rgb(0 0 0 / 0.1), 0 8px 10px -6px rgb(0 0 0 / 0.1);
    --transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
}

/* 基础重置 */
* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

html {
    scroll-behavior: smooth;
}

body {
    font-family: 'Noto Sans SC', -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;
    color: var(--text-primary);
    background: var(--bg-primary);
    line-height: 1.6;
    overflow-x: hidden;
}

.container {
    max-width: 1280px;
    margin: 0 auto;
    padding: 0 24px;
}

/* ============================================
   导航栏
   ============================================ */
.navbar {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    z-index: 1000;
    padding: 20px 0;
    transition: var(--transition);
}

.navbar.scrolled {
    background: rgba(255, 255, 255, 0.98);
    backdrop-filter: blur(20px);
    box-shadow: var(--shadow-md);
    padding: 12px 0;
}

.nav-container {
    max-width: 1280px;
    margin: 0 auto;
    padding: 0 24px;
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.logo {
    display: flex;
    align-items: center;
    gap: 12px;
    font-size: 20px;
    font-weight: 700;
    color: var(--bg-primary);
    transition: var(--transition);
}

.navbar.scrolled .logo {
    color: var(--secondary-color);
}

.logo-icon {
    font-size: 24px;
    background: linear-gradient(135deg, var(--gradient-start), var(--gradient-end));
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.logo-text {
    letter-spacing: 1px;
}

.nav-menu {
    display: flex;
    list-style: none;
    gap: 40px;
}

.nav-link {
    color: rgba(255, 255, 255, 0.9);
    text-decoration: none;
    font-weight: 500;
    font-size: 15px;
    position: relative;
    transition: var(--transition);
}

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

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

.navbar.scrolled .nav-link:hover,
.navbar.scrolled .nav-link.active {
    color: var(--primary-color);
}

.nav-link::after {
    content: '';
    position: absolute;
    bottom: -6px;
    left: 0;
    width: 0;
    height: 2px;
    background: linear-gradient(90deg, var(--gradient-start), var(--gradient-end));
    transition: var(--transition);
}

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

.hamburger {
    display: none;
    flex-direction: column;
    gap: 6px;
    cursor: pointer;
    padding: 8px;
}

.hamburger span {
    width: 24px;
    height: 2px;
    background: var(--bg-primary);
    transition: var(--transition);
}

.navbar.scrolled .hamburger span {
    background: var(--secondary-color);
}

/* ============================================
   Hero 区域
   ============================================ */
.hero {
    position: relative;
    min-height: 100vh;
    display: flex;
    align-items: center;
    justify-content: center;
    background: linear-gradient(135deg, #0f172a 0%, #1e293b 50%, #1a56db 100%);
    overflow: hidden;
}

.hero-bg {
    position: absolute;
    inset: 0;
    overflow: hidden;
}

.hero-particle {
    position: absolute;
    border-radius: 50%;
    background: radial-gradient(circle, rgba(255,255,255,0.1) 0%, transparent 70%);
    animation: float 20s infinite ease-in-out;
}

.particle-1 {
    width: 400px;
    height: 400px;
    top: -200px;
    right: -100px;
    animation-delay: 0s;
}

.particle-2 {
    width: 300px;
    height: 300px;
    bottom: -100px;
    left: -100px;
    animation-delay: -5s;
}

.particle-3 {
    width: 200px;
    height: 200px;
    top: 50%;
    left: 30%;
    animation-delay: -10s;
}

.particle-4 {
    width: 250px;
    height: 250px;
    top: 30%;
    right: 20%;
    animation-delay: -15s;
}

.particle-5 {
    width: 150px;
    height: 150px;
    bottom: 20%;
    right: 30%;
    animation-delay: -7s;
}

@keyframes float {
    0%, 100% { transform: translate(0, 0) scale(1); }
    25% { transform: translate(30px, -30px) scale(1.05); }
    50% { transform: translate(-20px, 20px) scale(0.95); }
    75% { transform: translate(20px, 30px) scale(1.02); }
}

.hero-content {
    position: relative;
    z-index: 10;
    text-align: center;
    padding: 120px 24px 80px;
    max-width: 900px;
}

.hero-badge {
    display: inline-flex;
    align-items: center;
    gap: 8px;
    padding: 8px 20px;
    background: rgba(255, 255, 255, 0.1);
    border: 1px solid rgba(255, 255, 255, 0.2);
    border-radius: 50px;
    color: rgba(255, 255, 255, 0.9);
    font-size: 14px;
    font-weight: 500;
    margin-bottom: 32px;
    backdrop-filter: blur(10px);
}

.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(1.2); }
}

.hero-title {
    font-size: 72px;
    font-weight: 900;
    line-height: 1.1;
    margin-bottom: 24px;
}

.title-line {
    display: block;
    color: var(--bg-primary);
}

.title-line.highlight {
    background: linear-gradient(135deg, var(--gradient-start), var(--gradient-end));
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.hero-subtitle {
    font-size: 20px;
    color: rgba(255, 255, 255, 0.8);
    max-width: 700px;
    margin: 0 auto 48px;
    line-height: 1.8;
}

.hero-cta {
    display: flex;
    gap: 16px;
    justify-content: center;
    margin-bottom: 80px;
}

.btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    padding: 16px 36px;
    border-radius: 12px;
    font-size: 16px;
    font-weight: 600;
    text-decoration: none;
    transition: var(--transition);
    cursor: pointer;
    border: none;
}

.btn-primary {
    background: linear-gradient(135deg, var(--gradient-start), var(--gradient-end));
    color: var(--bg-primary);
    box-shadow: 0 10px 40px rgba(26, 86, 219, 0.4);
}

.btn-primary:hover {
    transform: translateY(-3px);
    box-shadow: 0 15px 50px rgba(26, 86, 219, 0.5);
}

.btn-secondary {
    background: rgba(255, 255, 255, 0.1);
    color: var(--bg-primary);
    border: 1px solid rgba(255, 255, 255, 0.3);
    backdrop-filter: blur(10px);
}

.btn-secondary:hover {
    background: rgba(255, 255, 255, 0.2);
    transform: translateY(-3px);
}

.btn-full {
    width: 100%;
}

.hero-stats {
    display: flex;
    justify-content: center;
    gap: 80px;
    padding-top: 40px;
    border-top: 1px solid rgba(255, 255, 255, 0.1);
}

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

.stat-number {
    display: block;
    font-size: 36px;
    font-weight: 700;
    color: var(--bg-primary);
    margin-bottom: 8px;
}

.stat-label {
    font-size: 14px;
    color: rgba(255, 255, 255, 0.6);
    text-transform: uppercase;
    letter-spacing: 1px;
}

.scroll-indicator {
    position: absolute;
    bottom: 40px;
    left: 50%;
    transform: translateX(-50%);
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 12px;
    color: rgba(255, 255, 255, 0.6);
    font-size: 13px;
    animation: bounce 2s infinite;
}

.scroll-mouse {
    width: 26px;
    height: 42px;
    border: 2px solid rgba(255, 255, 255, 0.4);
    border-radius: 13px;
    position: relative;
}

.scroll-mouse::before {
    content: '';
    position: absolute;
    top: 8px;
    left: 50%;
    transform: translateX(-50%);
    width: 4px;
    height: 8px;
    background: rgba(255, 255, 255, 0.6);
    border-radius: 2px;
    animation: scroll 2s infinite;
}

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

@keyframes scroll {
    0%, 100% { opacity: 1; transform: translateX(-50%) translateY(0); }
    50% { opacity: 0.3; transform: translateX(-50%) translateY(10px); }
}

/* ============================================
   通用 Section 样式
   ============================================ */
section {
    padding: 120px 0;
}

.section-header {
    text-align: center;
    margin-bottom: 80px;
}

.section-tag {
    display: inline-block;
    font-size: 14px;
    font-weight: 600;
    color: var(--primary-color);
    letter-spacing: 2px;
    margin-bottom: 16px;
}

.section-title {
    font-size: 48px;
    font-weight: 700;
    color: var(--text-primary);
    margin-bottom: 24px;
}

.section-line {
    width: 80px;
    height: 4px;
    background: linear-gradient(90deg, var(--gradient-start), var(--gradient-end));
    margin: 0 auto;
    border-radius: 2px;
}

/* ============================================
   关于我们
   ============================================ */
.about {
    background: var(--bg-secondary);
}

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

.about-lead {
    font-size: 20px;
    color: var(--text-primary);
    font-weight: 500;
    margin-bottom: 24px;
    line-height: 1.8;
}

.about-text p {
    color: var(--text-secondary);
    margin-bottom: 20px;
    line-height: 1.8;
}

.about-features {
    margin-top: 40px;
}

.feature {
    display: flex;
    gap: 16px;
    padding: 20px 0;
    border-bottom: 1px solid var(--border-color);
}

.feature:last-child {
    border-bottom: none;
}

.feature-icon {
    width: 48px;
    height: 48px;
    display: flex;
    align-items: center;
    justify-content: center;
    background: linear-gradient(135deg, var(--gradient-start), var(--gradient-end));
    color: var(--bg-primary);
    border-radius: 12px;
    font-size: 20px;
    flex-shrink: 0;
}

.feature-text h4 {
    font-size: 18px;
    font-weight: 600;
    color: var(--text-primary);
    margin-bottom: 4px;
}

.feature-text p {
    font-size: 14px;
    color: var(--text-secondary);
    margin: 0;
}

.about-image {
    position: relative;
}

.image-frame {
    position: relative;
    border-radius: 24px;
    overflow: hidden;
    background: linear-gradient(135deg, var(--gradient-start), var(--gradient-end));
    padding: 4px;
}

.image-placeholder {
    background: var(--bg-dark);
    border-radius: 20px;
    padding: 80px 40px;
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    min-height: 400px;
}

.placeholder-content {
    text-align: center;
    color: rgba(255, 255, 255, 0.8);
}

.placeholder-icon {
    font-size: 80px;
    display: block;
    margin-bottom: 24px;
    opacity: 0.8;
}

.placeholder-text {
    font-size: 28px;
    font-weight: 700;
    display: block;
    margin-bottom: 8px;
}

.placeholder-sub {
    font-size: 16px;
    opacity: 0.6;
}

.image-accent {
    position: absolute;
    bottom: -30px;
    right: -30px;
    width: 200px;
    height: 200px;
    background: linear-gradient(135deg, var(--accent-color), transparent);
    border-radius: 50%;
    opacity: 0.3;
    filter: blur(40px);
}

.about-card {
    position: absolute;
    bottom: -20px;
    left: -20px;
    background: var(--bg-primary);
    padding: 24px 32px;
    border-radius: 16px;
    box-shadow: var(--shadow-xl);
    display: flex;
    align-items: center;
    gap: 16px;
}

.card-icon {
    width: 50px;
    height: 50px;
    display: flex;
    align-items: center;
    justify-content: center;
    background: linear-gradient(135deg, var(--gradient-start), var(--gradient-end));
    color: var(--bg-primary);
    border-radius: 12px;
    font-size: 24px;
}

.card-content {
    display: flex;
    flex-direction: column;
}

.card-number {
    font-size: 12px;
    color: var(--text-secondary);
    margin-bottom: 4px;
}

.card-code {
    font-size: 16px;
    font-weight: 700;
    color: var(--text-primary);
}

/* ============================================
   核心业务
   ============================================ */
.business {
    background: var(--bg-primary);
}

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

.business-card {
    background: var(--bg-secondary);
    border-radius: 20px;
    padding: 40px 32px;
    transition: var(--transition);
    border: 1px solid var(--border-color);
}

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

.business-card.featured {
    background: linear-gradient(135deg, var(--gradient-start), var(--gradient-end));
    color: var(--bg-primary);
    border: none;
}

.business-card.featured p,
.business-card.featured .card-list li {
    color: rgba(255, 255, 255, 0.9);
}

.card-header {
    margin-bottom: 24px;
}

.card-icon {
    width: 64px;
    height: 64px;
    display: flex;
    align-items: center;
    justify-content: center;
    background: rgba(26, 86, 219, 0.1);
    border-radius: 16px;
    margin-bottom: 20px;
    transition: var(--transition);
}

.business-card.featured .card-icon {
    background: rgba(255, 255, 255, 0.2);
}

.card-icon svg {
    width: 32px;
    height: 32px;
    color: var(--primary-color);
}

.business-card.featured .card-icon svg {
    color: var(--bg-primary);
}

.business-card:hover .card-icon {
    background: var(--primary-color);
}

.business-card:hover .card-icon svg {
    color: var(--bg-primary);
}

.card-header h3 {
    font-size: 24px;
    font-weight: 700;
    color: var(--text-primary);
    margin-bottom: 16px;
}

.business-card.featured .card-header h3 {
    color: var(--bg-primary);
}

.business-card p {
    color: var(--text-secondary);
    margin-bottom: 24px;
    line-height: 1.8;
}

.card-list {
    list-style: none;
}

.card-list li {
    padding: 10px 0;
    color: var(--text-secondary);
    font-size: 15px;
    position: relative;
    padding-left: 20px;
}

.card-list li::before {
    content: '→';
    position: absolute;
    left: 0;
    color: var(--primary-color);
    font-weight: 700;
}

.business-card.featured .card-list li::before {
    color: var(--bg-primary);
}

/* ============================================
   企业愿景与价值观
   ============================================ */
.values {
    background: linear-gradient(180deg, var(--bg-secondary) 0%, var(--bg-primary) 100%);
}

.values-content {
    display: grid;
    grid-template-columns: 1fr 1.5fr;
    gap: 60px;
}

.vision-card {
    background: linear-gradient(135deg, var(--secondary-color), #1e293b);
    border-radius: 24px;
    padding: 48px;
    color: var(--bg-primary);
    position: relative;
    overflow: hidden;
}

.vision-card::before {
    content: '';
    position: absolute;
    top: -50%;
    right: -50%;
    width: 100%;
    height: 100%;
    background: radial-gradient(circle, rgba(26, 86, 219, 0.3) 0%, transparent 70%);
}

.vision-icon {
    width: 80px;
    height: 80px;
    display: flex;
    align-items: center;
    justify-content: center;
    background: rgba(255, 255, 255, 0.1);
    border-radius: 20px;
    margin-bottom: 32px;
}

.vision-icon svg {
    width: 40px;
    height: 40px;
    color: var(--bg-primary);
}

.vision-card h3 {
    font-size: 28px;
    font-weight: 700;
    margin-bottom: 20px;
}

.vision-card > p {
    color: rgba(255, 255, 255, 0.8);
    line-height: 1.8;
    margin-bottom: 32px;
}

.vision-focus {
    display: flex;
    flex-wrap: wrap;
    gap: 12px;
}

.vision-focus span {
    padding: 10px 20px;
    background: rgba(255, 255, 255, 0.1);
    border-radius: 50px;
    font-size: 14px;
    color: rgba(255, 255, 255, 0.9);
    border: 1px solid rgba(255, 255, 255, 0.2);
}

.core-values h3 {
    font-size: 28px;
    font-weight: 700;
    color: var(--text-primary);
    margin-bottom: 32px;
}

.values-grid {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 24px;
}

.value-item {
    display: flex;
    gap: 20px;
    padding: 28px;
    background: var(--bg-primary);
    border-radius: 16px;
    border: 1px solid var(--border-color);
    transition: var(--transition);
}

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

.value-number {
    font-size: 32px;
    font-weight: 900;
    background: linear-gradient(135deg, var(--gradient-start), var(--gradient-end));
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
    line-height: 1;
}

.value-content h4 {
    font-size: 20px;
    font-weight: 700;
    color: var(--text-primary);
    margin-bottom: 8px;
}

.value-content p {
    font-size: 14px;
    color: var(--text-secondary);
    line-height: 1.7;
}

/* ============================================
   联系我们
   ============================================ */
.contact {
    background: var(--bg-primary);
}

.contact-content {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 60px;
}

.contact-info {
    display: flex;
    flex-direction: column;
    gap: 24px;
}

.info-card {
    display: flex;
    align-items: center;
    gap: 20px;
    padding: 24px 28px;
    background: var(--bg-secondary);
    border-radius: 16px;
    transition: var(--transition);
}

.info-card:hover {
    transform: translateX(10px);
    box-shadow: var(--shadow-md);
}

.info-icon {
    font-size: 32px;
    width: 60px;
    height: 60px;
    display: flex;
    align-items: center;
    justify-content: center;
    background: linear-gradient(135deg, var(--gradient-start), var(--gradient-end));
    border-radius: 14px;
    flex-shrink: 0;
}

.info-text h4 {
    font-size: 18px;
    font-weight: 600;
    color: var(--text-primary);
    margin-bottom: 4px;
}

.info-text p {
    font-size: 15px;
    color: var(--text-secondary);
}

.contact-form-wrapper {
    background: var(--bg-secondary);
    border-radius: 24px;
    padding: 48px;
}

.contact-form {
    display: flex;
    flex-direction: column;
    gap: 20px;
}

.form-group input,
.form-group textarea {
    width: 100%;
    padding: 18px 24px;
    border: 2px solid var(--border-color);
    border-radius: 12px;
    font-size: 16px;
    font-family: inherit;
    transition: var(--transition);
    background: var(--bg-primary);
}

.form-group input:focus,
.form-group textarea:focus {
    outline: none;
    border-color: var(--primary-color);
    box-shadow: 0 0 0 4px rgba(26, 86, 219, 0.1);
}

.form-group textarea {
    resize: vertical;
    min-height: 140px;
}

/* ============================================
   页脚
   ============================================ */
.footer {
    background: var(--bg-dark);
    color: rgba(255, 255, 255, 0.7);
    padding: 80px 0 40px;
}

.footer-content {
    display: grid;
    grid-template-columns: 1.5fr 2fr;
    gap: 80px;
    padding-bottom: 60px;
    border-bottom: 1px solid rgba(255, 255, 255, 0.1);
}

.footer-brand .logo {
    color: var(--bg-primary);
    margin-bottom: 20px;
}

.footer-brand p {
    font-size: 16px;
    color: rgba(255, 255, 255, 0.6);
}

.footer-links {
    display: flex;
    gap: 80px;
}

.link-group h4 {
    font-size: 16px;
    font-weight: 600;
    color: var(--bg-primary);
    margin-bottom: 24px;
}

.link-group ul {
    list-style: none;
}

.link-group li {
    margin-bottom: 12px;
}

.link-group a {
    color: rgba(255, 255, 255, 0.6);
    text-decoration: none;
    transition: var(--transition);
}

.link-group a:hover {
    color: var(--bg-primary);
}

.link-group li:not(:has(a)) {
    color: rgba(255, 255, 255, 0.6);
}

.footer-bottom {
    padding-top: 40px;
    text-align: center;
}

.footer-bottom p {
    font-size: 14px;
    color: rgba(255, 255, 255, 0.5);
    margin-bottom: 8px;
}

/* ============================================
   响应式设计
   ============================================ */
@media (max-width: 1024px) {
    .business-grid {
        grid-template-columns: repeat(2, 1fr);
    }
    
    .values-content {
        grid-template-columns: 1fr;
    }
    
    .contact-content {
        grid-template-columns: 1fr;
    }
    
    .footer-content {
        grid-template-columns: 1fr;
        gap: 40px;
    }
}

@media (max-width: 768px) {
    .nav-menu {
        position: fixed;
        top: 0;
        right: -100%;
        width: 280px;
        height: 100vh;
        background: var(--bg-dark);
        flex-direction: column;
        padding: 100px 40px;
        gap: 24px;
        transition: var(--transition);
    }
    
    .nav-menu.active {
        right: 0;
    }
    
    .nav-link {
        color: rgba(255, 255, 255, 0.9);
        font-size: 18px;
    }
    
    .hamburger {
        display: flex;
        z-index: 1001;
    }
    
    .hero-title {
        font-size: 42px;
    }
    
    .hero-subtitle {
        font-size: 16px;
    }
    
    .hero-stats {
        flex-direction: column;
        gap: 32px;
    }
    
    .hero-cta {
        flex-direction: column;
    }
    
    .about-content {
        grid-template-columns: 1fr;
        gap: 48px;
    }
    
    .business-grid {
        grid-template-columns: 1fr;
    }
    
    .values-grid {
        grid-template-columns: 1fr;
    }
    
    .section-title {
        font-size: 36px;
    }
    
    .contact-form-wrapper {
        padding: 32px 24px;
    }
    
    .footer-links {
        flex-direction: column;
        gap: 40px;
    }
}

@media (max-width: 480px) {
    .hero-title {
        font-size: 32px;
    }
    
    .stat-number {
        font-size: 28px;
    }
    
    .value-item {
        padding: 20px;
    }
    
    .vision-card {
        padding: 32px 24px;
    }
}