/* --- Global Styles & Variables --- */
:root {
    --primary-color: #0A2647; /* 深邃蓝 */
    --secondary-color: #144272; /* 商务蓝 */
    --accent-color: #E0B853; /* 典雅金 */
    --text-color: #333;
    --light-text-color: #f4f4f4;
    --background-color: #FFFFFF;
    --light-gray-bg: #f9f9f9;
    --font-primary: 'Montserrat', sans-serif;
    --font-secondary: 'Roboto', sans-serif;
}

/* --- Base Reset --- */
* { margin: 0; padding: 0; box-sizing: border-box; scroll-behavior: smooth; }

body {
    font-family: var(--font-secondary);
    line-height: 1.6;
    color: var(--text-color);
    background-color: var(--background-color);
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
}

.container { max-width: 1100px; margin: 0 auto; padding: 0 20px; }

/* --- Typography --- */
h1, h2, h3, h4 { font-family: var(--font-primary); font-weight: 600; line-height: 1.3; }
h1 { font-size: 2.8rem; }
h2 { font-size: 2.2rem; }
h3 { font-size: 1.5rem; }
.section-title { text-align: center; margin-bottom: 50px; color: var(--primary-color); font-weight: 700; }

/* --- Navbar --- */
.navbar {
    background: rgba(255, 255, 255, 0.9);
    backdrop-filter: blur(10px);
    -webkit-backdrop-filter: blur(10px);
    color: var(--primary-color);
    padding: 1rem 0;
    position: fixed;
    width: 100%;
    top: 0;
    z-index: 1000;
    box-shadow: 0 2px 10px rgba(0,0,0,0.1);
    transition: background-color 0.3s ease;
}

.navbar .container { display: flex; justify-content: space-between; align-items: center; }
.navbar .logo { font-family: var(--font-primary); font-size: 1.5rem; font-weight: 700; color: var(--primary-color); text-decoration: none; }
.navbar nav { margin-right: auto; margin-left: 40px; } /* Pushes switcher to the right */
.navbar nav ul { list-style: none; display: flex; }
.navbar nav ul li { margin-left: 25px; }
.navbar nav ul li a { color: var(--primary-color); text-decoration: none; font-weight: 500; padding-bottom: 5px; position: relative; transition: color 0.3s ease; }
.navbar nav ul li a::after { content: ''; position: absolute; bottom: 0; left: 0; width: 0; height: 2px; background-color: var(--accent-color); transition: width 0.3s ease; }
.navbar nav ul li a:hover { color: var(--secondary-color); }
.navbar nav ul li a:hover::after { width: 100%; }

/* --- Language Switcher --- */
.language-switcher { display: flex; align-items: center; gap: 8px; }
.language-switcher a { color: var(--secondary-color); text-decoration: none; font-weight: 600; font-size: 0.9rem; padding: 4px 8px; border-radius: 4px; transition: all 0.3s ease; }
.language-switcher a:hover { background-color: var(--light-gray-bg); color: var(--primary-color); }
.language-switcher a.active-lang { background-color: var(--primary-color); color: #fff; }

/* --- Hero Section --- */
.hero { height: 100vh; background: url('https://images.unsplash.com/photo-1610419354960-a22096a603d3?q=80&w=2070&auto-format&fit=crop') no-repeat center center/cover; position: relative; display: flex; align-items: center; justify-content: center; text-align: center; padding-top: 60px; }
.hero-overlay { position: absolute; top: 0; left: 0; width: 100%; height: 100%; background: linear-gradient(0deg, rgba(10, 38, 71, 0.8) 0%, rgba(10, 38, 71, 0.6) 100%); }
.hero-content { position: relative; z-index: 2; color: var(--light-text-color); max-width: 800px; }
.hero-title { font-size: 3.2rem; font-weight: 700; margin-bottom: 1rem; text-shadow: 0 2px 4px rgba(0,0,0,0.3); }
.hero-subtitle { font-size: 1.3rem; margin-bottom: 2.5rem; font-weight: 400; opacity: 0.9; }
.hero-buttons { display: flex; justify-content: center; gap: 20px; flex-wrap: wrap; margin-top: 2rem; }

/* --- Hero Stats --- */
.hero-stats { display: flex; justify-content: center; gap: 40px; margin: 2.5rem 0; flex-wrap: wrap; }
.stat-item { text-align: center; color: var(--light-text-color); }
.stat-number { display: block; font-size: 2.5rem; font-weight: 700; color: var(--accent-color); text-shadow: 0 2px 4px rgba(0,0,0,0.3); }
.stat-label { font-size: 0.9rem; font-weight: 400; opacity: 0.9; margin-top: 0.5rem; }

/* --- Buttons --- */
.btn { display: inline-block; padding: 14px 32px; border-radius: 50px; text-decoration: none; font-weight: 600; font-family: var(--font-primary); transition: all 0.3s ease; border: 2px solid transparent; letter-spacing: 0.5px; }
.btn-primary { background-color: var(--accent-color); color: var(--primary-color); }
.btn-primary:hover { background-color: transparent; border-color: var(--accent-color); color: var(--accent-color); transform: translateY(-3px); }
.btn-secondary { background-color: transparent; color: #fff; border-color: #fff; }
.btn-secondary:hover { background-color: #fff; color: var(--primary-color); transform: translateY(-3px); }

/* --- General Section Styling --- */
section { padding: 100px 0; }
#about, #contact { background-color: var(--background-color); }
#solutions { background-color: var(--light-gray-bg); }

/* --- About Section --- */
.about-content { max-width: 800px; margin: 0 auto; text-align: left; }
.about-text h3 { margin-top: 30px; margin-bottom: 10px; color: var(--secondary-color); }
.about-text h3:first-child { margin-top: 0; }

/* --- Solutions Section --- */
.solutions-grid { display: grid; grid-template-columns: repeat(auto-fit, minmax(350px, 1fr)); gap: 30px; }
.solution-card { background: #fff; padding: 35px; border-radius: 8px; box-shadow: 0 4px 15px rgba(0,0,0,0.08); transition: transform 0.3s ease, box-shadow 0.3s ease; border-top: 4px solid var(--primary-color); }
.solution-card:hover { transform: translateY(-8px); box-shadow: 0 10px 30px rgba(0,0,0,0.12); }
.solution-card h3 { color: var(--primary-color); }
.solution-card .target-market { font-style: italic; color: var(--accent-color); font-weight: 600; margin-bottom: 15px; }
.solution-card h4 { margin-bottom: 15px; color: var(--secondary-color); }
.solution-card ul { list-style-type: none; }
.solution-card ul li { padding-left: 20px; position: relative; margin-bottom: 10px; }
.solution-card ul li::before { content: '✔'; color: var(--accent-color); position: absolute; left: 0; }

/* --- Contact Section --- */
.contact-subtitle { text-align: center; margin-bottom: 40px; max-width: 600px; margin-left: auto; margin-right: auto; }
.contact-content { display: grid; grid-template-columns: 2fr 1fr; gap: 50px; margin-top: 20px; }
.contact-form { display: grid; grid-template-columns: 1fr 1fr; gap: 20px; }
.form-group { display: flex; flex-direction: column; }
.form-group.full-width { grid-column: 1 / -1; }
.form-group label { margin-bottom: 8px; font-weight: 500; color: var(--secondary-color); }
.form-group input, .form-group textarea, .form-group select { padding: 12px; border: 1px solid #ccc; border-radius: 5px; font-family: var(--font-secondary); font-size: 1rem; transition: border-color 0.3s ease, box-shadow 0.3s ease; }
.form-group input:focus, .form-group textarea:focus, .form-group select:focus { outline: none; border-color: var(--primary-color); box-shadow: 0 0 0 3px rgba(10, 38, 71, 0.1); }
.btn-submit { background-color: var(--accent-color); color: var(--primary-color); border: none; cursor: pointer; font-size: 1.1rem; font-weight: 600; width: 100%; border-radius: 5px; padding: 15px; transition: all 0.3s ease; }
.btn-submit:hover { background-color: var(--primary-color); color: var(--accent-color); transform: translateY(-2px); box-shadow: 0 5px 15px rgba(0,0,0,0.2); }
.form-privacy { text-align: center; font-size: 0.85rem; color: #666; margin-top: 15px; font-style: italic; }
.contact-info { background: var(--light-gray-bg); padding: 30px; border-radius: 8px; }
.contact-info h3 { color: var(--primary-color); margin-bottom: 15px; }
.contact-info p { margin-bottom: 15px; }
.contact-info a { color: var(--secondary-color); text-decoration: none; word-break: break-all; }
.contact-info a:hover { text-decoration: underline; color: var(--primary-color); }

/* --- Trust Badges --- */
.trust-badges { display: flex; gap: 10px; margin-top: 20px; flex-wrap: wrap; }
.badge { background-color: var(--primary-color); color: var(--light-text-color); padding: 6px 12px; border-radius: 20px; font-size: 0.8rem; font-weight: 600; }

/* --- Footer --- */
.footer { background-color: var(--primary-color); color: var(--light-text-color); text-align: center; padding: 30px 0; }

/* --- Responsive Design --- */
@media (max-width: 820px) {
    .navbar .container { flex-wrap: wrap; justify-content: center; row-gap: 15px; }
    .navbar nav { margin: 0; }
    .navbar nav ul { padding: 0; }
}

@media (max-width: 768px) {
    h1 { font-size: 2.2rem; }
    h2 { font-size: 1.8rem; }
    .hero { min-height: 80vh; }
    .hero-title { font-size: 2.5rem; }
    .hero-stats { gap: 20px; }
    .stat-number { font-size: 2rem; }
    .stat-label { font-size: 0.8rem; }
    .solutions-grid { grid-template-columns: 1fr; }
    .contact-content { grid-template-columns: 1fr; }
    .contact-form { grid-template-columns: 1fr; }
    .contact-info { margin-top: 20px; }
    .trust-badges { justify-content: center; }
}