/* Base styles and resets */
:root {
    --primary-color: #007bff;
    --secondary-color: #6c757d;
    --success-color: #28a745;
    --danger-color: #dc3545;
    --warning-color: #ffc107;
    --info-color: #17a2b8;
    --light-color: #f8f9fa;
    --dark-color: #343a40;
    --text-color: #333;
    --heading-color: #222;
    --border-color: #dee2e6;
    --font-family-base: 'Arial', sans-serif;
    --font-family-heading: 'Helvetica Neue', sans-serif;
    --spacing-unit: 1rem;
}

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

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

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

a:hover {
    text-decoration: underline;
}

h1, h2, h3, h4, h5, h6 {
    font-family: var(--font-family-heading);
    color: var(--heading-color);
    margin-bottom: var(--spacing-unit);
}

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

.container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 var(--spacing-unit);
}

/* Buttons */
.btn {
    display: inline-block;
    font-weight: 400;
    color: #fff;
    text-align: center;
    vertical-align: middle;
    user-select: none;
    background-color: var(--primary-color);
    border: 1px solid var(--primary-color);
    padding: 0.6rem 1.2rem;
    font-size: 1rem;
    line-height: 1.5;
    border-radius: 0.25rem;
    transition: color 0.15s ease-in-out, background-color 0.15s ease-in-out, border-color 0.15s ease-in-out, box-shadow 0.15s ease-in-out;
    cursor: pointer;
}

.btn:hover {
    background-color: darken(var(--primary-color), 10%);
    border-color: darken(var(--primary-color), 12%);
    text-decoration: none;
}

.btn-primary {
    background-color: var(--primary-color);
    border-color: var(--primary-color);
}

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

.btn-hero {
    padding: 0.8rem 1.8rem;
    font-size: 1.1rem;
    border-radius: 0.3rem;
}

.btn-hero-outline {
    background-color: transparent;
    color: var(--primary-color);
    border: 1px solid var(--primary-color);
}

.btn-hero-outline:hover {
    background-color: var(--primary-color);
    color: #fff;
}


/* Forms */
input[type="text"],
input[type="email"],
input[type="password"],
input[type="search"],
textarea {
    display: block;
    width: 100%;
    padding: 0.6rem 0.75rem;
    font-size: 1rem;
    line-height: 1.5;
    color: var(--text-color);
    background-color: #fff;
    background-clip: padding-box;
    border: 1px solid var(--border-color);
    border-radius: 0.25rem;
    transition: border-color 0.15s ease-in-out, box-shadow 0.15s ease-in-out;
}

input[type="text"]:focus,
input[type="email"]:focus,
input[type="password"]:focus,
input[type="search"]:focus,
textarea:focus {
    color: var(--text-color);
    background-color: #fff;
    border-color: #80bdff;
    outline: 0;
    box-shadow: 0 0 0 0.2rem rgba(0, 123, 255, 0.25);
}

/* Header Specific Styles */
.main-header {
    background-color: #fff;
    box-shadow: 0 2px 4px rgba(0,0,0,0.05);
    padding: 1rem 0;
}

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

.logo {
    display: flex;
    align-items: center;
    gap: 10px;
}

.logo img {
    height: 40px;
    width: auto;
}

.site-title {
    font-size: 1.8rem;
    font-weight: 700;
    color: var(--heading-color);
}

.site-title:hover {
    text-decoration: none;
    color: var(--primary-color);
}

.primary-navigation .nav-list {
    list-style: none;
    display: flex;
    gap: 1.5rem;
    align-items: center;
}

.primary-navigation .nav-item {
    position: relative;
}

.primary-navigation .nav-link {
    color: var(--dark-color);
    font-weight: 500;
    padding: 0.5rem 0;
    display: block;
    transition: color 0.3s ease;
}

.primary-navigation .nav-link:hover {
    color: var(--primary-color);
    text-decoration: none;
}

.primary-navigation .submenu {
    display: none;
    position: absolute;
    top: 100%;
    left: 0;
    background-color: #fff;
    box-shadow: 0 4px 8px rgba(0,0,0,0.1);
    list-style: none;
    min-width: 180px;
    z-index: 1000;
    padding: 0.5rem 0;
    border-radius: 0.25rem;
}

.primary-navigation .has-submenu:hover > .submenu {
    display: block;
}

.primary-navigation .submenu li a {
    padding: 0.75rem 1rem;
    color: var(--text-color);
    display: block;
    white-space: nowrap;
}

.primary-navigation .submenu li a:hover {
    background-color: var(--light-color);
    color: var(--primary-color);
}

.search-form {
    display: flex;
    align-items: center;
    gap: 5px;
}

.search-form input {
    width: 180px;
    padding: 0.5rem 0.75rem;
    border-radius: 20px;
    border: 1px solid var(--border-color);
}

.search-form button {
    background: none;
    border: none;
    color: var(--dark-color);
    cursor: pointer;
    font-size: 1.2rem;
    padding: 0.5rem;
}

.search-form button:hover {
    color: var(--primary-color);
}

.menu-toggle {
    display: none; /* Hidden on desktop */
}

/* Hero Section */
.hero-section {
    background: linear-gradient(rgba(0, 0, 0, 0.5), rgba(0, 0, 0, 0.5)), url('/assets/images/hero-bg.jpg') no-repeat center center/cover;
    color: #fff;
    text-align: center;
    padding: 6rem 0;
    margin-bottom: 2rem;
}

.hero-section h2 {
    color: #fff;
    font-size: 3rem;
    margin-bottom: 1rem;
}

.hero-section p {
    font-size: 1.25rem;
    max-width: 800px;
    margin: 0 auto 2rem auto;
    line-height: 1.8;
}

.hero-section .btn {
    margin: 0 0.5rem;
}

/* Footer Styles */
.main-footer {
    background-color: var(--dark-color);
    color: var(--light-color);
    padding: 3rem 0 1rem 0;
    font-size: 0.9rem;
}

.footer-content {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: 2rem;
    margin-bottom: 2rem;
}

.footer-section h3 {
    color: #fff;
    margin-bottom: 1rem;
    font-size: 1.1rem;
}

.footer-section ul {
    list-style: none;
}

.footer-section ul li {
    margin-bottom: 0.7rem;
}

.footer-section a {
    color: var(--light-color);
    transition: color 0.3s ease;
}

.footer-section a:hover {
    color: var(--primary-color);
    text-decoration: none;
}

.social-media a {
    display: inline-block;
    margin-right: 10px;
    font-size: 1.5rem;
}

.social-media img {
    width: 24px;
    height: 24px;
    filter: invert(1); /* Makes SVG icons white */
    transition: filter 0.3s ease;
}

.social-media a:hover img {
    filter: invert(0.5) sepia(1) saturate(5) hue-rotate(175deg); /* Changes to primary color */
}

.newsletter-form {
    margin-top: 1rem;
}

.newsletter-form input {
    background-color: #4a4a4a;
    border: 1px solid #5a5a5a;
    color: #fff;
    margin-bottom: 0.5rem;
}

.newsletter-form input::placeholder {
    color: #ccc;
}

.newsletter-form button {
    width: auto;
    padding: 0.5rem 1rem;
    background-color: var(--primary-color);
    border-color: var(--primary-color);
}

.footer-bottom {
    border-top: 1px solid #444;
    padding-top: 1rem;
    text-align: center;
    color: #ccc;
}

/* Responsive adjustments */
@media (max-width: 992px) {
    .primary-navigation .nav-list {
        display: none;
        flex-direction: column;
        width: 100%;
        position: absolute;
        top: 100%;
        left: 0;
        background-color: #fff;
        box-shadow: 0 4px 8px rgba(0,0,0,0.1);
        padding: 1rem 0;
    }

    .primary-navigation .nav-list.active {
        display: flex;
    }

    .primary-navigation .nav-item {
        width: 100%;
        text-align: center;
    }

    .primary-navigation .nav-link {
        padding: 0.75rem 1rem;
        border-bottom: 1px solid var(--border-color);
    }

    .primary-navigation .has-submenu > .submenu {
        position: static;
        box-shadow: none;
        background-color: var(--light-color);
        padding: 0;
        border-radius: 0;
        width: 100%;
    }

    .primary-navigation .submenu li a {
        padding-left: 2rem;
        border-bottom: none;
    }

    .menu-toggle {
        display: block;
        background: none;
        border: none;
        font-size: 1.5rem;
        cursor: pointer;
        color: var(--dark-color);
        padding: 0.5rem;
    }

    .menu-toggle .icon-bar {
        display: block;
        width: 25px;
        height: 3px;
        background-color: var(--dark-color);
        margin: 5px auto;
        transition: all 0.3s ease-in-out;
    }

    .header-top {
        padding-bottom: 1rem;
        border-bottom: 1px solid var(--border-color);
    }

    .hero-section h2 {
        font-size: 2.2rem;
    }

    .hero-section p {
        font-size: 1rem;
    }
}

@media (max-width: 768px) {
    .footer-content {
        grid-template-columns: 1fr;
        text-align: center;
    }

    .footer-section ul {
        padding-left: 0;
    }

    .social-media {
        display: flex;
        justify-content: center;
        gap: 10px;
    }

    .social-media a {
        margin: 0;
    }

    .newsletter-form {
        display: flex;
        flex-direction: column;
        align-items: center;
    }

    .newsletter-form input,
    .newsletter-form button {
        width: 80%;
        max-width: 300px;
    }
}

@media (max-width: 576px) {
    .header-top {
        flex-direction: column;
        text-align: center;
        gap: 1rem;
    }

    .logo {
        justify-content: center;
    }

    .primary-navigation {
        width: 100%;
    }

    .primary-navigation .nav-list.active {
        position: static;
    }

    .hero-section {
        padding: 4rem 0;
    }

    .hero-section h2 {
        font-size: 1.8rem;
    }

    .hero-section .btn {
        display: block;
        margin: 1rem auto;
        width: 80%;
        max-width: 250px;
    }
}
/* 移动端内容区防溢出（系统追加，请勿删除） */
@media (max-width: 768px) {
  .page-content img {
    max-width: 100% !important;
    height: auto !important;
    display: block;
  }
  .page-content {
    overflow-x: hidden;
    max-width: 100%;
  }
  body {
    overflow-x: hidden;
  }
}