/* shared.css - 全局共享样式表 */

/* 通用重置与基础样式 */
:root {
    --primary-color: #007bff;
    --secondary-color: #6c757d;
    --accent-color: #28a745;
    --text-color: #333;
    --light-text-color: #666;
    --background-color: #f8f9fa;
    --dark-background-color: #343a40;
    --border-color: #dee2e6;
    --font-family-base: 'Roboto', 'Open Sans', sans-serif;
    --font-family-heading: 'Roboto', sans-serif;
    --container-max-width: 1200px;
    --header-height: 70px;
}

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

html {
    scroll-behavior: smooth;
}

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

a {
    color: var(--primary-color);
    text-decoration: none;
    transition: color 0.3s ease;
}

a:hover {
    color: darken(var(--primary-color), 10%); /* Placeholder for CSS preprocessor like Sass */
    text-decoration: underline;
}

img {
    max-width: 100%;
    height: auto;
    vertical-align: middle;
}

ul, ol {
    list-style: none;
}

h1, h2, h3, h4, h5, h6 {
    font-family: var(--font-family-heading);
    color: var(--dark-background-color);
    margin-bottom: 0.5em;
    line-height: 1.2;
}

p {
    margin-bottom: 1em;
}

.container {
    max-width: var(--container-max-width);
    margin: 0 auto;
    padding: 0 15px;
}

/* 按钮样式 */
.btn {
    display: inline-block;
    padding: 10px 20px;
    border-radius: 5px;
    font-size: 1rem;
    font-weight: 600;
    text-align: center;
    cursor: pointer;
    transition: background-color 0.3s ease, color 0.3s ease, border-color 0.3s ease;
    border: 1px solid transparent;
}

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

.btn-primary:hover {
    background-color: darken(var(--primary-color), 10%);
    border-color: darken(var(--primary-color), 10%);
}

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

.btn-secondary:hover {
    background-color: darken(var(--secondary-color), 10%);
    border-color: darken(var(--secondary-color), 10%);
}

.btn-cta {
    background-color: var(--accent-color);
    color: #fff;
    border-color: var(--accent-color);
    padding: 12px 25px;
    font-size: 1.1rem;
}

.btn-cta:hover {
    background-color: darken(var(--accent-color), 10%);
    border-color: darken(var(--accent-color), 10%);
}

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

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

/* Header 样式 */
.main-header {
    background-color: #fff;
    box-shadow: 0 2px 10px rgba(0, 0, 0, 0.05);
    padding: 15px 0;
    position: sticky;
    top: 0;
    z-index: 1000;
}

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

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

.main-nav .nav-list {
    display: flex;
    gap: 25px;
}

.main-nav .nav-item {
    position: relative;
}

.main-nav .nav-link {
    display: block;
    padding: 10px 0;
    color: var(--text-color);
    font-weight: 500;
    transition: color 0.3s ease;
}

.main-nav .nav-link:hover,
.main-nav .nav-link.current {
    color: var(--primary-color);
}

.main-nav .has-dropdown > .nav-link {
    display: flex;
    align-items: center;
}

.main-nav .has-dropdown > .nav-link i {
    font-size: 0.8em;
    margin-left: 5px;
    transition: transform 0.3s ease;
}

.main-nav .dropdown-menu {
    position: absolute;
    top: 100%;
    left: 0;
    background-color: #fff;
    box-shadow: 0 5px 15px rgba(0, 0, 0, 0.1);
    border-radius: 5px;
    min-width: 180px;
    opacity: 0;
    visibility: hidden;
    transform: translateY(10px);
    transition: opacity 0.3s ease, transform 0.3s ease, visibility 0.3s;
    z-index: 10;
    padding: 10px 0;
}

.main-nav .has-dropdown:hover .dropdown-menu {
    opacity: 1;
    visibility: visible;
    transform: translateY(0);
}

.main-nav .dropdown-menu li a {
    display: block;
    padding: 8px 20px;
    color: var(--text-color);
    white-space: nowrap;
}

.main-nav .dropdown-menu li a:hover {
    background-color: var(--background-color);
    color: var(--primary-color);
}

.header-actions {
    display: flex;
    gap: 10px;
}

.menu-toggle {
    display: none; /* Hidden by default, shown on mobile */
    background: none;
    border: none;
    font-size: 1.5rem;
    color: var(--text-color);
    cursor: pointer;
    padding: 5px;
}

.sr-only {
    position: absolute;
    width: 1px;
    height: 1px;
    padding: 0;
    margin: -1px;
    overflow: hidden;
    clip: rect(0, 0, 0, 0);
    white-space: nowrap;
    border: 0;
}

/* Hero Section 样式 */
.hero-section {
    background: linear-gradient(rgba(0, 0, 0, 0.6), rgba(0, 0, 0, 0.6)), url('/static/images/hero-bg.jpg') no-repeat center center/cover;
    color: #fff;
    text-align: center;
    padding: 100px 0;
    min-height: 500px;
    display: flex;
    align-items: center;
    justify-content: center;
}

.hero-section h1 {
    font-size: 3.5rem;
    margin-bottom: 20px;
    color: #fff;
}

.hero-section p {
    font-size: 1.3rem;
    margin-bottom: 30px;
    max-width: 800px;
    margin-left: auto;
    margin-right: auto;
}

.hero-section .btn {
    margin: 0 10px;
}

/* Footer 样式 */
.main-footer {
    background-color: var(--dark-background-color);
    color: rgba(255, 255, 255, 0.8);
    padding: 60px 0 20px;
    font-size: 0.95rem;
}

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

.main-footer a:hover {
    text-decoration: underline;
}

.main-footer h3 {
    color: #fff;
    font-size: 1.2rem;
    margin-bottom: 20px;
    position: relative;
}

.main-footer h3::after {
    content: '';
    display: block;
    width: 50px;
    height: 3px;
    background-color: var(--primary-color);
    margin-top: 10px;
}

.main-footer .footer-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: 30px;
    margin-bottom: 40px;
}

.main-footer .footer-column ul {
    margin-top: 10px;
}

.main-footer .footer-column ul li {
    margin-bottom: 10px;
}

.main-footer .footer-column ul li a {
    color: rgba(255, 255, 255, 0.7);
    transition: color 0.3s ease;
}

.main-footer .footer-column ul li a:hover {
    color: var(--primary-color);
}

.main-footer .contact-info p {
    margin-bottom: 10px;
    display: flex;
    align-items: center;
}

.main-footer .contact-info p i {
    margin-right: 10px;
    color: var(--primary-color);
    font-size: 1.1em;
}

.main-footer .social-links a {
    display: inline-flex;
    justify-content: center;
    align-items: center;
    width: 40px;
    height: 40px;
    background-color: rgba(255, 255, 255, 0.1);
    color: #fff;
    border-radius: 50%;
    margin-right: 10px;
    font-size: 1.2em;
    transition: background-color 0.3s ease;
}

.main-footer .social-links a:hover {
    background-color: var(--primary-color);
    text-decoration: none;
}

.main-footer .newsletter-form {
    display: flex;
    margin-top: 15px;
}

.main-footer .newsletter-form input[type="email"] {
    flex-grow: 1;
    padding: 10px 15px;
    border: none;
    border-radius: 5px 0 0 5px;
    outline: none;
    background-color: rgba(255, 255, 255, 0.15);
    color: #fff;
}

.main-footer .newsletter-form input[type="email"]::placeholder {
    color: rgba(255, 255, 255, 0.7);
}

.main-footer .newsletter-form .btn-subscribe {
    background-color: var(--primary-color);
    color: #fff;
    border: none;
    padding: 10px 20px;
    border-radius: 0 5px 5px 0;
    cursor: pointer;
    transition: background-color 0.3s ease;
}

.main-footer .newsletter-form .btn-subscribe:hover {
    background-color: darken(var(--primary-color), 10%);
}

.main-footer .footer-bottom {
    text-align: center;
    padding-top: 30px;
    border-top: 1px solid rgba(255, 255, 255, 0.1);
    margin-top: 20px;
}

.main-footer .footer-bottom p {
    margin-bottom: 0;
}

.main-footer .footer-bottom a {
    color: rgba(255, 255, 255, 0.7);
    margin: 0 8px;
}

/* 响应式设计 */
@media (max-width: 992px) {
    .main-nav .nav-list {
        gap: 15px;
    }
    .main-header .header-actions {
        display: none; /* Hide login/signup on smaller screens if space is tight */
    }
    .hero-section h1 {
        font-size: 2.8rem;
    }
    .hero-section p {
        font-size: 1.1rem;
    }
}

@media (max-width: 768px) {
    .main-header .container {
        flex-direction: column;
        align-items: flex-start;
    }
    .main-header .logo {
        margin-bottom: 15px;
        width: 100%;
        text-align: center;
    }
    .main-nav {
        width: 100%;
        order: 3; /* Move nav below logo and toggle */
    }
    .menu-toggle {
        display: block;
        align-self: flex-end;
        position: absolute;
        top: 20px;
        right: 15px;
    }
    .main-nav .nav-list {
        flex-direction: column;
        width: 100%;
        background-color: #fff;
        box-shadow: 0 5px 15px rgba(0, 0, 0, 0.05);
        border-radius: 5px;
        padding: 10px 0;
        margin-top: 10px;
        display: none; /* Hidden by default */
    }
    .main-nav .nav-list.active {
        display: flex; /* Show when active */
    }
    .main-nav .nav-item {
        width: 100%;
    }
    .main-nav .nav-link {
        padding: 12px 20px;
        border-bottom: 1px solid var(--border-color);
    }
    .main-nav .nav-item:last-child .nav-link {
        border-bottom: none;
    }
    .main-nav .dropdown-menu {
        position: static;
        box-shadow: none;
        border-radius: 0;
        transform: none;
        opacity: 1;
        visibility: visible;
        margin-top: 0;
        padding-left: 20px;
        background-color: var(--background-color);
        border-top: 1px solid var(--border-color);
    }
    .main-nav .dropdown-menu li a {
        padding: 8px 30px;
    }
    .main-footer .footer-grid {
        grid-template-columns: 1fr;
        text-align: center;
    }
    .main-footer .footer-column h3::after {
        margin-left: auto;
        margin-right: auto;
    }
    .main-footer .newsletter-form {
        flex-direction: column;
    }
    .main-footer .newsletter-form input[type="email"],
    .main-footer .newsletter-form .btn-subscribe {
        border-radius: 5px;
        margin-bottom: 10px;
        width: 100%;
    }
    .main-footer .social-links {
        text-align: center;
        margin-top: 20px;
    }
}
/* 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;
  }
}