/* css/style.css */
:root {
    --primary-color: #0056b3;
    --secondary-color: #004494;
    --accent-color: #f8f9fa;
    --text-color: #333333;
    --light-text: #666666;
    --bg-light: #f4f7f6;
    --white: #ffffff;
    --border-color: #dddddd;
    --transition: all 0.3s ease;
}

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

body {
    font-family: "PingFang SC", "Microsoft YaHei", "Helvetica Neue", Helvetica, Arial, sans-serif;
    line-height: 1.6;
    color: var(--text-color);
    background-color: var(--white);
    -webkit-font-smoothing: antialiased;
}

a {
    text-decoration: none;
    color: var(--primary-color);
    transition: var(--transition);
}

a:hover {
    color: var(--secondary-color);
}

ul {
    list-style: none;
}

.container {
    width: 100%;
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 20px;
}

/* Header */
header {
    background: var(--white);
    box-shadow: 0 2px 10px rgba(0,0,0,0.1);
    position: sticky;
    top: 0;
    z-index: 1000;
}

.header-top {
    background: var(--bg-light);
    font-size: 12px;
    padding: 8px 0;
    color: var(--light-text);
}

.header-top .container {
    display: flex;
    justify-content: space-between;
}

.header-main {
    padding: 15px 0;
}

.header-main .container {
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.logo {
    font-size: 20px;
    font-weight: bold;
    color: var(--primary-color);
}

.logo span {
    font-size: 14px;
    font-weight: normal;
    color: var(--light-text);
    display: block;
}

.nav-links {
    display: flex;
    gap: 30px;
}

.nav-links a {
    font-size: 16px;
    color: var(--text-color);
    font-weight: 500;
    padding: 10px 0;
}

.nav-links a:hover, .nav-links a.active {
    color: var(--primary-color);
    border-bottom: 2px solid var(--primary-color);
}

.menu-toggle {
    display: none;
    font-size: 24px;
    cursor: pointer;
}

/* Hero Section */
.hero {
    background: linear-gradient(rgba(0, 86, 179, 0.7), rgba(0, 68, 148, 0.8)), url('https://images.unsplash.com/photo-1451187580459-43490279c0fa?q=80&w=1920&auto=format&fit=crop') center/cover;
    height: 500px;
    display: flex;
    align-items: center;
    text-align: center;
    color: var(--white);
}

.hero h1 {
    font-size: 48px;
    margin-bottom: 20px;
}

.hero p {
    font-size: 20px;
    margin-bottom: 30px;
    opacity: 0.9;
}

.btn {
    display: inline-block;
    padding: 12px 30px;
    background: var(--primary-color);
    color: var(--white);
    border-radius: 4px;
    font-size: 16px;
    border: none;
    cursor: pointer;
    transition: var(--transition);
}

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

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

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

/* Sections */
.section {
    padding: 80px 0;
}

.section-bg {
    background: var(--bg-light);
}

.section-title {
    text-align: center;
    margin-bottom: 50px;
}

.section-title h2 {
    font-size: 32px;
    color: var(--text-color);
    margin-bottom: 10px;
}

.section-title p {
    color: var(--light-text);
}

/* Grid Layouts */
.grid-3 {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 30px;
}

.grid-2 {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: 40px;
    align-items: center;
}

/* Cards */
.card {
    background: var(--white);
    border-radius: 8px;
    overflow: hidden;
    box-shadow: 0 4px 15px rgba(0,0,0,0.05);
    transition: var(--transition);
}

.card:hover {
    transform: translateY(-5px);
    box-shadow: 0 10px 25px rgba(0,0,0,0.1);
}

.card-img {
    height: 200px;
    width: 100%;
    object-fit: cover;
}

.card-body {
    padding: 25px;
}

.card-title {
    font-size: 20px;
    margin-bottom: 15px;
}

/* FAQ */
.faq-item {
    margin-bottom: 15px;
    border: 1px solid var(--border-color);
    border-radius: 4px;
}

.faq-question {
    padding: 15px 20px;
    background: var(--white);
    cursor: pointer;
    font-weight: bold;
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.faq-answer {
    padding: 0 20px;
    max-height: 0;
    overflow: hidden;
    transition: max-height 0.3s ease-out;
    background: var(--bg-light);
}

/* Forms */
.form-group {
    margin-bottom: 20px;
}

.form-control {
    width: 100%;
    padding: 12px;
    border: 1px solid var(--border-color);
    border-radius: 4px;
    font-size: 16px;
    font-family: inherit;
}

.form-control:focus {
    outline: none;
    border-color: var(--primary-color);
}

.error-msg {
    color: #dc3545;
    font-size: 14px;
    margin-top: 5px;
    display: none;
}

/* Footer */
footer {
    background: #222;
    color: #aaa;
    padding: 60px 0 20px;
}

.footer-grid {
    display: grid;
    grid-template-columns: 2fr 1fr 1fr;
    gap: 40px;
    margin-bottom: 40px;
}

.footer-title {
    color: var(--white);
    font-size: 18px;
    margin-bottom: 20px;
}

.footer-links li {
    margin-bottom: 10px;
}

.footer-links a {
    color: #aaa;
}

.footer-links a:hover {
    color: var(--white);
}

.footer-bottom {
    text-align: center;
    padding-top: 20px;
    border-top: 1px solid #444;
    font-size: 14px;
}

.tag-platform {
    display: inline-block;
    background: rgba(255,255,255,0.2);
    padding: 5px 15px;
    border-radius: 20px;
    font-size: 14px;
    margin-bottom: 15px;
}

/* Responsive */
@media (max-width: 768px) {
    .nav-links {
        display: none;
        flex-direction: column;
        position: absolute;
        top: 100%;
        left: 0;
        width: 100%;
        background: var(--white);
        box-shadow: 0 5px 10px rgba(0,0,0,0.1);
        padding: 20px;
    }

    .nav-links.show {
        display: flex;
    }

    .menu-toggle {
        display: block;
    }

    .grid-3, .grid-2, .footer-grid {
        grid-template-columns: 1fr;
    }

    .hero h1 {
        font-size: 32px;
    }

    .header-top {
        display: none;
    }
}