/* --- 高级 Clean Fit 色彩与全局配置 --- */
:root {
    --primary-bg: #ffffff;
    --secondary-bg: #fdfcf8; /* 暖白色/浅米色 */
    --accent-green: #2c5f55;  /* 主墨绿色 */
    --accent-teal: #4c8a81;   /* 柔和的蓝绿色块 */
    --text-dark: #222;
    --text-light: #ffffff;
    --card-bg: #ffffff;
    --font-display: 'Poppins', 'Segoe UI', sans-serif;
    --font-body: 'Open Sans', 'Segoe UI', sans-serif;
    --transition-speed: 0.3s;
}

* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
    font-family: var(--font-body);
}

html { scroll-behavior: smooth; }

body {
    background-color: var(--primary-bg);
    color: var(--text-dark);
    line-height: 1.6;
}

a { text-decoration: none; color: inherit; }

/* --- 按钮样式 --- */
.btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    padding: 12px 28px;
    background-color: var(--accent-green);
    color: var(--text-light);
    border-radius: 5px;
    font-weight: 600;
    border: 2px solid var(--accent-green);
    cursor: pointer;
    transition: all var(--transition-speed) ease;
}

.btn:hover {
    background-color: transparent;
    color: var(--accent-green);
    transform: translateY(-2px);
}

.btn.secondary {
    background-color: transparent;
    color: var(--accent-green);
}

.btn.secondary:hover {
    background-color: var(--accent-green);
    color: var(--text-light);
}

.lang-toggle {
    background: rgba(44, 95, 85, 0.1);
    border: 1px solid var(--accent-green);
    color: var(--accent-green);
    padding: 6px 14px;
    border-radius: 20px;
    cursor: pointer;
    font-weight: 600;
    font-size: 0.9rem;
    transition: all var(--transition-speed) ease;
}

.lang-toggle:hover {
    background-color: var(--accent-green);
    color: var(--text-light);
}

[data-i18n] { transition: opacity 0.2s ease; }

/* --- 滚动丝滑浮现效果 --- */
.reveal {
    opacity: 0;
    transform: translateY(40px);
    transition: all 0.7s cubic-bezier(0.5, 0, 0, 1);
}
.reveal.active {
    opacity: 1;
    transform: translateY(0);
}
.delay-1 { transition-delay: 0.1s; }
.delay-2 { transition-delay: 0.2s; }

/* --- 全局标题 --- */
.section-title {
    font-family: var(--font-display);
    font-size: 2.5rem;
    margin-bottom: 3.5rem;
    text-align: center;
    letter-spacing: -0.5px;
}

/* --- 导航栏 --- */
header {
    background-color: rgba(255, 255, 255, 0.9);
    backdrop-filter: blur(10px);
    position: fixed;
    width: 100%;
    top: 0;
    z-index: 1000;
    box-shadow: 0 2px 15px rgba(0,0,0,0.03);
    border-bottom: 1px solid rgba(0,0,0,0.05);
}

.top-bar {
    background-color: #fdfcf8;
    color: var(--accent-green);
    text-align: center;
    padding: 8px 15px;
    font-size: 0.85rem;
    font-weight: 500;
}

nav {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 1rem 5%;
    max-width: 1200px;
    margin: 0 auto;
}

.logo {
    font-size: 1.5rem;
    font-weight: 700;
    color: var(--accent-green);
    letter-spacing: 0.5px;
}

.nav-links { display: flex; list-style: none; gap: 2.5rem; }
.nav-links a { font-weight: 500; font-size: 0.95rem; transition: color var(--transition-speed); }
.nav-links a:hover { color: var(--accent-green); }
.nav-actions { display: flex; align-items: center; gap: 1.5rem; }

/* --- 主视觉区 --- */
.hero {
    padding: 180px 5% 120px;
    background: linear-gradient(rgba(44, 95, 85, 0.3), rgba(44, 95, 85, 0.3)), url('../image/megen.jpg') no-repeat center center/cover;
    text-align: center;
    color: var(--text-light);
    min-height: 80vh;
    display: flex;
    flex-direction: column;
    justify-content: center;
    align-items: center;
}

.hero h1 {
    font-family: var(--font-display);
    font-size: 3.5rem;
    margin-bottom: 1.5rem;
    line-height: 1.2;
    max-width: 900px;
    letter-spacing: -1px;
}

.hero p {
    font-size: 1.2rem;
    margin-bottom: 3rem;
    max-width: 600px;
    font-weight: 300;
}

.hero-btns { display: flex; gap: 1.5rem; flex-wrap: wrap; justify-content: center; }

/* --- 核心服务 --- */
.expertise-section {
    padding: 100px 5%;
    background-color: var(--secondary-bg);
}

.service-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(350px, 1fr));
    gap: 3rem;
    max-width: 1200px;
    margin: 0 auto;
}

.service-card {
    background-color: var(--card-bg);
    padding: 3rem;
    border-radius: 8px;
    box-shadow: 0 10px 30px rgba(0,0,0,0.03);
    transition: transform var(--transition-speed), box-shadow var(--transition-speed);
    border-top: 4px solid var(--accent-teal);
}

.service-card:hover {
    transform: translateY(-5px);
    box-shadow: 0 15px 40px rgba(0,0,0,0.08);
    border-top-color: var(--accent-green);
}

.service-card .icon { font-size: 2.5rem; margin-bottom: 1.5rem; }
.service-card h3 {
    font-family: var(--font-display);
    font-size: 1.8rem;
    margin-bottom: 1rem;
    color: var(--accent-green);
}
.service-card p { color: #555; font-size: 0.95rem; }

/* --- 信任与表单 --- */
.trust-section { padding: 100px 5%; text-align: center; }
.quote-form-section { padding: 100px 5%; background-color: var(--card-bg); }

.quote-form-container {
    max-width: 700px;
    margin: 0 auto;
    border: 1px solid rgba(0,0,0,0.1);
    padding: 3rem;
    border-radius: 8px;
    box-shadow: 0 8px 30px rgba(0,0,0,0.02);
}

.quote-form { display: grid; grid-template-columns: repeat(2, 1fr); gap: 1.5rem; }
.form-group { display: flex; flex-direction: column; }
.form-group label { margin-bottom: 0.5rem; font-weight: 500; color: var(--accent-green); }
.form-group input, .form-group select {
    padding: 12px;
    border: 1px solid rgba(0,0,0,0.1);
    border-radius: 5px;
    font-size: 0.95rem;
}
.form-group.full-width { grid-column: span 2; }

/* --- 页脚 --- */
footer {
    background-color: #1a252f;
    color: #e0e0e0;
    padding: 60px 5% 30px;
    text-align: center;
}

.footer-content { max-width: 800px; margin: 0 auto 2rem; }
.footer-logo {
    font-size: 1.5rem;
    font-weight: 700;
    color: var(--accent-green);
    margin-bottom: 1rem;
    display: block;
}
.footer-info { margin: 1.5rem 0; font-size: 0.9rem; line-height: 1.8; }
.copyright {
    border-top: 1px solid rgba(255,255,255,0.1);
    padding-top: 20px;
    font-size: 0.8rem;
    color: #888;
}

/* --- 响应式 --- */
@media (max-width: 992px) {
    .nav-links { display: none; }
    .hero h1 { font-size: 2.5rem; }
    .quote-form { grid-template-columns: 1fr; }
    .form-group.full-width { grid-column: span 1; }
}

/* --- 自定义单选按钮组 (Radio Group) 高级样式 --- */
.quote-form { 
    display: flex; 
    flex-direction: column; 
    gap: 1.5rem; 
} /* 强制单列显示，符合手机端习惯 */

.radio-group {
    display: flex;
    gap: 1rem;
}

.radio-group input[type="radio"] {
    display: none; /* 隐藏原本丑陋的圆点 radio */
}

.radio-group label {
    flex: 1;
    text-align: center;
    padding: 12px;
    border: 2px solid rgba(44, 95, 85, 0.2);
    border-radius: 5px;
    cursor: pointer;
    transition: all 0.3s ease;
    font-weight: 500;
    color: var(--text-dark);
    margin-bottom: 0 !important;
}

/* 当用户选中时的样式 */
.radio-group input[type="radio"]:checked + label {
    border-color: var(--accent-green);
    background-color: rgba(44, 95, 85, 0.05);
    color: var(--accent-green);
    box-shadow: 0 4px 10px rgba(0,0,0,0.03);
}

.quote-form-container {
    max-width: 550px; /* 让表单稍微窄一点，更好看 */
}

/* --- 自定义 Logo 字母与数字大小对比 --- */
.logo-small {
    font-size: 0.65em; /* 把数字缩小到 DY 字母的 65% 大小 */
    font-weight: 500;  /* 字体重量稍微调细一点，增加层次感 */
    margin-left: 2px;  /* 让数字和字母之间有一点点呼吸空间 */
    letter-spacing: 1px;
}

/* --- 移动端响应式设计 (Mobile Responsive) --- */
.hamburger { display: none; flex-direction: column; gap: 5px; cursor: pointer; z-index: 1001; }
.hamburger span { width: 25px; height: 3px; background-color: var(--accent-green); transition: 0.3s; border-radius: 2px;}
.mobile-lang { display: none; }

/* 当屏幕宽度小于 768px (手机/小平板) 时，执行以下 CSS */
@media (max-width: 768px) {
    /* 1. 导航栏变身滑动菜单 */
    .hamburger { display: flex; }
    .nav-actions { display: none; } /* 手机端隐藏顶部右侧按钮，保持顶部干净 */
    .mobile-lang { display: block; margin-top: 20px; }
    .nav-links {
        position: fixed; top: 0; right: -100%; width: 65%; height: 100vh;
        background-color: var(--primary-bg); flex-direction: column;
        justify-content: center; align-items: center; transition: 0.4s cubic-bezier(0.25, 0.8, 0.25, 1);
        box-shadow: -10px 0 20px rgba(0,0,0,0.05); z-index: 1000;
    }
    .nav-links.active { right: 0; }
    
    /* 汉堡按钮变成 X 的高级动画 */
    .hamburger.toggle span:nth-child(1) { transform: rotate(-45deg) translate(-5px, 6px); }
    .hamburger.toggle span:nth-child(2) { opacity: 0; }
    .hamburger.toggle span:nth-child(3) { transform: rotate(45deg) translate(-5px, -6px); }

    /* 2. 主视觉区 (Hero) 字体与间距缩小 */
    .hero h1 { font-size: 2.2rem; }
    .hero p { font-size: 1rem; margin-bottom: 2rem;}
    .hero { padding: 130px 5% 60px; min-height: 70vh; }
    .hero-btns { flex-direction: column; width: 100%; gap: 1rem;}
    .hero-btns .btn { width: 100%; }
    
    /* 3. 核心业务区：左右排版强制改为上下堆叠 */
    .section-title { font-size: 2rem; margin-bottom: 2rem; }
    .service-row, .service-row:nth-child(even) { flex-direction: column-reverse; text-align: center; gap: 30px; margin-bottom: 70px; }
    .service-visual { width: 100%; height: 250px; }
    .link-arrow { justify-content: center; width: 100%; }
    
    /* 4. 报价单变为单列，方便拇指点击 */
    .quote-form-container { padding: 2rem 1.5rem; }
    .quote-form { grid-template-columns: 1fr; gap: 1rem;}
    .form-group.full-width { grid-column: span 1; }
    .radio-group { flex-direction: column; gap: 8px; } /* 选择题上下排 */
}