/* ========================================
   德弘达硕 - 翡翠橙光风格
   温暖活力的科技美学 - 2026
   ======================================== */

/* ========== CSS 变量 ========== */
:root {
    /* 主色调 - 翡翠绿 */
    --primary: #10b981;
    --primary-dark: #059669;
    --primary-light: #34d399;
    --primary-glow: rgba(16, 185, 129, 0.3);
    
    /* 辅助色 - 琥珀橙 */
    --accent: #f59e0b;
    --accent-light: #fbbf24;
    --accent-glow: rgba(245, 158, 11, 0.3);
    
    /* 渐变色 */
    --gradient-primary: linear-gradient(135deg, #10b981 0%, #059669 100%);
    --gradient-accent: linear-gradient(135deg, #f59e0b 0%, #f97316 100%);
    --gradient-warm: linear-gradient(135deg, #fef3c7 0%, #fed7aa 100%);
    --gradient-hero: linear-gradient(135deg, #064e3b 0%, #065f46 50%, #047857 100%);
    
    /* 中性色 - 暖色调 */
    --bg-dark: #064e3b;
    --bg-card: #f0fdf4;
    --bg-light: #fffbeb;
    --bg-warm: #fef3c7;
    --text-primary: #1f2937;
    --text-secondary: #6b7280;
    --text-light: #9ca3af;
    --text-white: #ffffff;
    --text-warm: #78350f;
    
    /* 边框和阴影 */
    --border-light: rgba(0, 0, 0, 0.08);
    --border-dark: rgba(6, 78, 59, 0.2);
    --shadow-sm: 0 2px 8px rgba(6, 78, 59, 0.08);
    --shadow-md: 0 8px 24px rgba(6, 78, 59, 0.12);
    --shadow-lg: 0 16px 48px rgba(6, 78, 59, 0.15);
    --shadow-glow: 0 0 40px var(--primary-glow);
    --shadow-accent: 0 0 30px var(--accent-glow);
    
    /* 间距 */
    --container-width: 1280px;
    --header-height: 70px;
    
    /* 动画 */
    --transition-fast: 0.2s ease;
    --transition-base: 0.3s ease;
    --transition-slow: 0.5s cubic-bezier(0.4, 0, 0.2, 1);
}

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

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

body {
    font-family: 'Noto Sans SC', 'PingFang SC', 'Microsoft YaHei', sans-serif;
    font-size: 1rem;
    line-height: 1.8;
    color: var(--text-primary);
    background: #fafaf9;
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
}

a {
    color: inherit;
    text-decoration: none;
    transition: all var(--transition-fast);
}

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

ul, ol {
    list-style: none;
}

/* ========== 工具类 ========== */
.container {
    max-width: var(--container-width);
    margin: 0 auto;
    padding: 0 32px;
}

.section {
    padding: 100px 0;
}

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

.section-title h2 {
    font-size: 2.25rem;
    font-weight: 700;
    color: var(--text-primary);
    margin-bottom: 12px;
    letter-spacing: -0.02em;
}

.section-title p {
    font-size: 1.125rem;
    color: var(--text-secondary);
    max-width: 600px;
    margin: 0 auto;
}

.text-gradient {
    background: var(--gradient-accent);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

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

/* ========== 按钮 ========== */
.btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: 8px;
    padding: 14px 32px;
    font-size: 1rem;
    font-weight: 600;
    border-radius: 50px;
    border: none;
    cursor: pointer;
    transition: all var(--transition-base);
}

.btn-primary {
    background: var(--gradient-primary);
    color: white;
    box-shadow: 0 4px 16px var(--primary-glow);
}

.btn-primary:hover {
    transform: translateY(-2px);
    box-shadow: 0 8px 24px var(--primary-glow);
}

.btn-accent {
    background: var(--gradient-accent);
    color: white;
    box-shadow: 0 4px 16px var(--accent-glow);
}

.btn-accent:hover {
    transform: translateY(-2px);
    box-shadow: 0 8px 24px var(--accent-glow);
}

.btn-outline {
    background: transparent;
    border: 2px solid var(--primary);
    color: var(--primary);
}

.btn-outline:hover {
    background: var(--primary);
    color: white;
}

/* ========== 头部导航 ========== */
.header {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    height: var(--header-height);
    background: rgba(255, 255, 255, 0.9);
    backdrop-filter: blur(10px);
    border-bottom: 1px solid var(--border-light);
    z-index: 1000;
    transition: all var(--transition-base);
}

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

.header-inner {
    display: flex;
    align-items: center;
    justify-content: space-between;
    height: 100%;
}

.logo {
    display: flex;
    align-items: center;
    gap: 12px;
    font-size: 1.25rem;
    font-weight: 700;
    color: var(--text-primary);
}

.logo-icon {
    width: 42px;
    height: 42px;
    background: var(--gradient-accent);
    border-radius: 12px;
    display: flex;
    align-items: center;
    justify-content: center;
    color: white;
    font-size: 1.25rem;
    font-weight: 700;
    box-shadow: var(--shadow-accent);
}

.nav-menu {
    display: flex;
    gap: 4px;
}

.nav-menu a {
    padding: 10px 18px;
    border-radius: 8px;
    color: var(--text-secondary);
    font-weight: 500;
    font-size: 0.95rem;
    transition: all var(--transition-fast);
}

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

.nav-actions {
    display: flex;
    gap: 12px;
}

/* ========== Hero Banner ========== */
.hero {
    position: relative;
    min-height: 100vh;
    display: flex;
    align-items: center;
    justify-content: center;
    padding-top: var(--header-height);
    overflow: hidden;
    background: var(--gradient-hero);
}

.hero::before {
    content: '';
    position: absolute;
    top: -50%;
    right: -20%;
    width: 80%;
    height: 150%;
    background: radial-gradient(ellipse, rgba(245, 158, 11, 0.15) 0%, transparent 70%);
    animation: float 20s ease-in-out infinite;
}

.hero::after {
    content: '';
    position: absolute;
    bottom: -30%;
    left: -10%;
    width: 60%;
    height: 120%;
    background: radial-gradient(ellipse, rgba(16, 185, 129, 0.2) 0%, transparent 70%);
    animation: float 25s ease-in-out infinite reverse;
}

@keyframes float {
    0%, 100% { transform: translate(0, 0) rotate(0deg); }
    33% { transform: translate(30px, -30px) rotate(5deg); }
    66% { transform: translate(-20px, 20px) rotate(-5deg); }
}

.hero-content {
    position: relative;
    text-align: center;
    max-width: 900px;
    padding: 0 24px;
}

.hero-badge {
    display: inline-flex;
    align-items: center;
    gap: 8px;
    padding: 8px 20px;
    background: rgba(255, 255, 255, 0.15);
    border: 1px solid rgba(255, 255, 255, 0.3);
    border-radius: 100px;
    color: rgba(255, 255, 255, 0.9);
    font-size: 0.875rem;
    margin-bottom: 32px;
    backdrop-filter: blur(10px);
}

.hero-badge-dot {
    width: 8px;
    height: 8px;
    background: #fbbf24;
    border-radius: 50%;
    animation: pulse 2s infinite;
}

@keyframes pulse {
    0%, 100% { opacity: 1; transform: scale(1); }
    50% { opacity: 0.7; transform: scale(1.2); }
}

.hero h1 {
    font-size: 4.5rem;
    font-weight: 800;
    color: var(--text-white);
    line-height: 1.05;
    margin-bottom: 24px;
    letter-spacing: -0.03em;
    text-shadow: 0 4px 20px rgba(0, 0, 0, 0.3);
}

.hero-description {
    font-size: 1.25rem;
    color: rgba(255, 255, 255, 0.9);
    max-width: 700px;
    margin: 0 auto 48px;
    line-height: 1.9;
}

.hero-buttons {
    display: flex;
    gap: 16px;
    justify-content: center;
    margin-bottom: 64px;
}

.hero-stats {
    display: flex;
    gap: 48px;
    justify-content: center;
    backdrop-filter: blur(10px);
    background: rgba(255, 255, 255, 0.1);
    padding: 24px 48px;
    border-radius: 20px;
    border: 1px solid rgba(255, 255, 255, 0.2);
}

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

.hero-stat-value {
    display: block;
    font-size: 2.5rem;
    font-weight: 700;
    color: #fbbf24;
    text-shadow: 0 2px 10px rgba(0, 0, 0, 0.3);
}

.hero-stat-label {
    font-size: 0.875rem;
    color: rgba(255, 255, 255, 0.8);
}

/* ========== 核心业务 ========== */
.services {
    background: linear-gradient(180deg, #fafaf9 0%, #f0fdf4 100%);
}

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

.service-card {
    padding: 40px 32px;
    background: white;
    border-radius: 24px;
    border: 1px solid #e5e7eb;
    box-shadow: var(--shadow-sm);
    transition: all var(--transition-base);
    position: relative;
    overflow: hidden;
}

.service-card::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    height: 4px;
    background: var(--gradient-primary);
    transform: scaleX(0);
    transition: transform var(--transition-base);
}

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

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

.service-icon {
    font-size: 3.5rem;
    margin-bottom: 24px;
    display: inline-block;
    transition: transform var(--transition-base);
}

.service-card:hover .service-icon {
    transform: scale(1.1) rotate(5deg);
}

.service-card h3 {
    font-size: 1.25rem;
    font-weight: 600;
    margin-bottom: 12px;
    color: var(--text-primary);
}

.service-card p {
    color: var(--text-secondary);
    line-height: 1.8;
    font-size: 0.95rem;
}

/* ========== 关于我们 ========== */
.about {
    background: white;
}

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

.about-image {
    position: relative;
    border-radius: 24px;
    overflow: hidden;
}

.about-image::before {
    content: '';
    position: absolute;
    inset: -20px;
    background: var(--gradient-warm);
    border-radius: 32px;
    z-index: -1;
    transform: rotate(-3deg);
}

.about-image img {
    width: 100%;
    height: 500px;
    object-fit: cover;
    border-radius: 24px;
    box-shadow: var(--shadow-lg);
}

.about-text h3 {
    font-size: 2rem;
    font-weight: 700;
    margin-bottom: 24px;
    color: var(--text-primary);
}

.about-text p {
    color: var(--text-secondary);
    margin-bottom: 16px;
    line-height: 1.9;
}

.about-features {
    display: grid;
    gap: 16px;
    margin-top: 32px;
}

.about-feature {
    display: flex;
    align-items: center;
    gap: 12px;
    padding: 12px 16px;
    background: var(--bg-card);
    border-radius: 12px;
}

.about-feature-icon {
    width: 28px;
    height: 28px;
    background: var(--gradient-primary);
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    color: white;
    font-size: 0.875rem;
    font-weight: 700;
    flex-shrink: 0;
}

/* ========== 办公环境 ========== */
.office {
    background: var(--bg-light);
}

.office-grid {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: 20px;
}

.office-card {
    position: relative;
    border-radius: 20px;
    overflow: hidden;
    aspect-ratio: 4/3;
    cursor: pointer;
    box-shadow: var(--shadow-sm);
}

.office-card img {
    width: 100%;
    height: 100%;
    object-fit: cover;
    transition: transform var(--transition-slow);
}

.office-card:hover img {
    transform: scale(1.1);
}

.office-overlay {
    position: absolute;
    inset: 0;
    background: linear-gradient(to top, rgba(6, 78, 59, 0.9) 0%, transparent 100%);
    display: flex;
    flex-direction: column;
    justify-content: flex-end;
    padding: 24px;
    opacity: 0;
    transition: opacity var(--transition-base);
}

.office-card:hover .office-overlay {
    opacity: 1;
}

.office-overlay h4 {
    color: white;
    font-size: 1.125rem;
    margin-bottom: 4px;
    font-weight: 600;
}

.office-overlay p {
    color: rgba(255,255,255,0.85);
    font-size: 0.875rem;
}

/* ========== 页脚 ========== */
.footer {
    background: var(--bg-dark);
    padding: 80px 0 40px;
    position: relative;
    overflow: hidden;
}

.footer::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    height: 2px;
    background: var(--gradient-accent);
}

.footer-content {
    display: grid;
    grid-template-columns: 2fr 1fr 1fr 1fr;
    gap: 64px;
    margin-bottom: 64px;
    position: relative;
}

.footer-brand .logo {
    margin-bottom: 16px;
}

.footer-brand p {
    color: rgba(255, 255, 255, 0.7);
    line-height: 1.9;
}

.footer-column h4 {
    color: #fbbf24;
    font-size: 1rem;
    font-weight: 600;
    margin-bottom: 24px;
}

.footer-column a {
    display: block;
    color: rgba(255, 255, 255, 0.7);
    padding: 8px 0;
    transition: all var(--transition-fast);
}

.footer-column a:hover {
    color: var(--primary-light);
    padding-left: 8px;
}

.footer-bottom {
    border-top: 1px solid rgba(255, 255, 255, 0.1);
    padding-top: 32px;
    text-align: center;
    color: rgba(255, 255, 255, 0.6);
    font-size: 0.875rem;
}

/* ========== 登录注册页面 ========== */
.auth-page {
    min-height: 100vh;
    display: flex;
    align-items: center;
    justify-content: center;
    background: var(--gradient-hero);
    padding: 120px 24px 80px;
    position: relative;
}

.auth-page::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='%23fbbf24' fill-opacity='0.05'%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");
}

.auth-container {
    width: 100%;
    max-width: 480px;
    position: relative;
}

.auth-card {
    background: white;
    border-radius: 24px;
    padding: 48px;
    box-shadow: 0 25px 50px rgba(0, 0, 0, 0.3);
}

.auth-header {
    text-align: center;
    margin-bottom: 40px;
}

.auth-header h1 {
    font-size: 2rem;
    font-weight: 700;
    color: var(--text-primary);
    margin-bottom: 8px;
}

.auth-header p {
    color: var(--text-secondary);
}

.form-group {
    margin-bottom: 24px;
}

.form-group label {
    display: block;
    font-weight: 500;
    color: var(--text-primary);
    margin-bottom: 8px;
    font-size: 0.95rem;
}

.form-group input {
    width: 100%;
    padding: 14px 16px;
    border: 2px solid #e5e7eb;
    border-radius: 12px;
    font-size: 1rem;
    transition: all var(--transition-fast);
    background: #fafaf9;
}

.form-group input:focus {
    outline: none;
    border-color: var(--primary);
    background: white;
    box-shadow: 0 0 0 4px rgba(16, 185, 129, 0.1);
}

.auth-submit {
    width: 100%;
    padding: 16px;
    margin-top: 8px;
}

.auth-footer {
    text-align: center;
    margin-top: 24px;
    color: var(--text-secondary);
    font-size: 0.95rem;
}

.auth-footer a {
    color: var(--primary);
    font-weight: 600;
}

/* ========== 响应式 ========== */
@media (max-width: 1024px) {
    .services-grid {
        grid-template-columns: repeat(2, 1fr);
    }
    
    .office-grid {
        grid-template-columns: repeat(2, 1fr);
    }
    
    .footer-content {
        grid-template-columns: repeat(2, 1fr);
    }
    
    .hero-stats {
        flex-wrap: wrap;
        gap: 24px;
    }
}

@media (max-width: 768px) {
    .nav-menu {
        display: none;
    }
    
    .hero h1 {
        font-size: 2.5rem;
    }
    
    .hero-stats {
        flex-direction: column;
        gap: 24px;
        padding: 24px;
    }
    
    .services-grid {
        grid-template-columns: 1fr;
    }
    
    .about-content {
        grid-template-columns: 1fr;
        gap: 40px;
    }
    
    .about-image img {
        height: 300px;
    }
    
    .office-grid {
        grid-template-columns: 1fr;
    }
    
    .footer-content {
        grid-template-columns: 1fr;
        gap: 32px;
    }
    
    .hero-buttons {
        flex-direction: column;
    }
}