/* wallpaper.hk - Modern & Responsive CSS */
:root {
    --primary-color: #2c3e50;
    --secondary-color: #e74c3c;
    --accent-color: #3498db;
    --text-color: #333;
    --light-bg: #f8f9fa;
    --white: #ffffff;
    --gray: #6c757d;
    --border-color: #dee2e6;
    --shadow: 0 2px 15px rgba(0,0,0,0.1);
    --shadow-hover: 0 5px 25px rgba(0,0,0,0.15);
}

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

body {
    font-family: 'Microsoft JhengHei', 'PingFang TC', 'Helvetica Neue', Arial, sans-serif;
    line-height: 1.6;
    color: var(--text-color);
    background-color: var(--white);
}

/* Header & Navigation */
header {
    background: linear-gradient(135deg, var(--primary-color), #34495e);
    color: var(--white);
    padding: 0;
    position: sticky;
    top: 0;
    z-index: 1000;
    box-shadow: var(--shadow);
}

.header-top {
    background: rgba(0,0,0,0.2);
    padding: 0.5rem 0;
}

.container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 1.5rem;
}

.header-info {
    display: flex;
    justify-content: space-between;
    align-items: center;
    font-size: 0.9rem;
}

nav {
    padding: 1rem 0;
}

.nav-content {
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.logo {
    font-size: 1.8rem;
    font-weight: bold;
    color: var(--white);
    text-decoration: none;
    display: flex;
    align-items: center;
    gap: 0.5rem;
}

.nav-links {
    display: flex;
    list-style: none;
    gap: 2rem;
}

.nav-links a {
    color: var(--white);
    text-decoration: none;
    font-weight: 500;
    transition: color 0.3s;
    padding: 0.5rem 1rem;
    border-radius: 5px;
}

.nav-links a:hover {
    background: rgba(255,255,255,0.1);
    color: var(--accent-color);
}

/* Mobile Menu */
.mobile-menu-btn {
    display: none;
    background: none;
    border: none;
    color: var(--white);
    font-size: 1.5rem;
    cursor: pointer;
}

/* Hero Section */
.hero {
    background: linear-gradient(135deg, rgba(52, 152, 219, 0.9), rgba(44, 62, 80, 0.9)),
                url('../images/hero-placeholder.jpg') center/cover;
    color: var(--white);
    padding: 5rem 0;
    text-align: center;
}

.hero h1 {
    font-size: 3rem;
    margin-bottom: 1rem;
    text-shadow: 2px 2px 4px rgba(0,0,0,0.3);
}

.hero p {
    font-size: 1.3rem;
    margin-bottom: 2rem;
    text-shadow: 1px 1px 2px rgba(0,0,0,0.3);
}

.cta-button {
    display: inline-block;
    background: var(--secondary-color);
    color: var(--white);
    padding: 1rem 2.5rem;
    text-decoration: none;
    border-radius: 50px;
    font-weight: bold;
    font-size: 1.1rem;
    transition: all 0.3s;
    box-shadow: 0 4px 15px rgba(0,0,0,0.2);
}

.cta-button:hover {
    background: #c0392b;
    transform: translateY(-3px);
    box-shadow: 0 6px 20px rgba(0,0,0,0.3);
}

/* Section Styling */
section {
    padding: 4rem 0;
}

.section-title {
    text-align: center;
    font-size: 2.5rem;
    margin-bottom: 1rem;
    color: var(--primary-color);
    position: relative;
    padding-bottom: 1rem;
}

.section-title::after {
    content: '';
    position: absolute;
    bottom: 0;
    left: 50%;
    transform: translateX(-50%);
    width: 100px;
    height: 4px;
    background: linear-gradient(90deg, var(--accent-color), var(--secondary-color));
    border-radius: 2px;
}

.section-subtitle {
    text-align: center;
    color: var(--gray);
    font-size: 1.1rem;
    margin-bottom: 3rem;
}

/* Categories Grid */
.categories-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
    gap: 2rem;
    margin-top: 3rem;
}

.category-card {
    background: var(--white);
    border-radius: 15px;
    overflow: hidden;
    box-shadow: var(--shadow);
    transition: all 0.3s;
    cursor: pointer;
    position: relative;
}

.category-card:hover {
    transform: translateY(-10px);
    box-shadow: var(--shadow-hover);
}

.category-icon {
    font-size: 6rem;
    text-align: center;
    padding: 3rem 2rem;
    background: linear-gradient(135deg, #f8f9fa, #e9ecef);
    display: flex;
    align-items: center;
    justify-content: center;
    min-height: 200px;
}

.category-image {
    width: 100%;
    aspect-ratio: 9 / 16;
    object-fit: cover;
    transition: transform 0.3s;
}

.category-card:hover .category-image {
    transform: scale(1.1);
}

.category-overlay {
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: linear-gradient(to bottom, transparent, rgba(0,0,0,0.7));
    display: flex;
    align-items: flex-end;
    padding: 1.5rem;
}

.category-info {
    padding: 1.5rem;
    background: var(--white);
}

.category-title {
    font-size: 1.5rem;
    margin-bottom: 0.5rem;
    color: var(--primary-color);
}

.category-count {
    color: var(--gray);
    font-size: 0.9rem;
}

/* Wallpaper Grid */
.wallpaper-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(300px, 1fr));
    gap: 2rem;
    margin-top: 3rem;
}

.wallpaper-item {
    background: var(--white);
    border-radius: 10px;
    overflow: hidden;
    box-shadow: var(--shadow);
    transition: all 0.3s;
    cursor: pointer;
}

.wallpaper-item:hover {
    transform: translateY(-5px);
    box-shadow: var(--shadow-hover);
}

.wallpaper-image {
    width: 100%;
    aspect-ratio: 9 / 16;
    object-fit: cover;
}

.wallpaper-info {
    padding: 1rem;
}

.wallpaper-title {
    font-size: 1.1rem;
    margin-bottom: 0.5rem;
    color: var(--primary-color);
}

.wallpaper-desc {
    color: var(--gray);
    font-size: 0.9rem;
    line-height: 1.5;
}

.wallpaper-tags {
    display: flex;
    flex-wrap: wrap;
    gap: 0.5rem;
    margin-top: 0.5rem;
}

.tag {
    background: var(--light-bg);
    padding: 0.3rem 0.8rem;
    border-radius: 20px;
    font-size: 0.85rem;
    color: var(--gray);
}

/* Blog Section */
.blog-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(350px, 1fr));
    gap: 2rem;
    margin-top: 3rem;
}

.blog-card {
    background: var(--white);
    border-radius: 10px;
    overflow: hidden;
    box-shadow: var(--shadow);
    transition: all 0.3s;
}

.blog-card:hover {
    transform: translateY(-5px);
    box-shadow: var(--shadow-hover);
}

.blog-image {
    width: 100%;
    aspect-ratio: 9 / 16;
    object-fit: cover;
}

.blog-content {
    padding: 1.5rem;
}

.blog-title {
    font-size: 1.3rem;
    margin-bottom: 0.8rem;
    color: var(--primary-color);
}

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

.blog-title a:hover {
    color: var(--accent-color);
}

.blog-excerpt {
    color: var(--gray);
    line-height: 1.6;
    margin-bottom: 1rem;
}

.read-more {
    color: var(--accent-color);
    text-decoration: none;
    font-weight: 600;
    display: inline-flex;
    align-items: center;
    gap: 0.3rem;
}

.read-more:hover {
    text-decoration: underline;
}

/* Blog Post Page */
.blog-post {
    max-width: 800px;
    margin: 0 auto;
    padding: 3rem 1.5rem;
}

.blog-post-title {
    font-size: 2.5rem;
    color: var(--primary-color);
    margin-bottom: 1.5rem;
    line-height: 1.3;
}

.blog-post-meta {
    color: var(--gray);
    margin-bottom: 2rem;
    padding-bottom: 1rem;
    border-bottom: 2px solid var(--border-color);
}

.blog-post-image {
    width: 100%;
    height: 400px;
    object-fit: cover;
    border-radius: 10px;
    margin-bottom: 2rem;
}

.blog-post-content {
    font-size: 1.1rem;
    line-height: 1.8;
    color: var(--text-color);
}

.blog-post-content h2 {
    font-size: 2rem;
    color: var(--primary-color);
    margin-top: 2.5rem;
    margin-bottom: 1rem;
}

.blog-post-content h3 {
    font-size: 1.5rem;
    color: var(--primary-color);
    margin-top: 2rem;
    margin-bottom: 0.8rem;
}

.blog-post-content p {
    margin-bottom: 1.5rem;
}

.blog-post-content ul,
.blog-post-content ol {
    margin-bottom: 1.5rem;
    padding-left: 2rem;
}

.blog-post-content li {
    margin-bottom: 0.5rem;
}

/* SEO Content Section */
.seo-content {
    background: var(--light-bg);
    padding: 4rem 0;
    margin-top: 4rem;
}

.seo-text {
    max-width: 900px;
    margin: 0 auto;
    font-size: 1rem;
    line-height: 1.8;
    color: var(--text-color);
}

.seo-text h2 {
    font-size: 2rem;
    color: var(--primary-color);
    margin-bottom: 1rem;
}

.seo-text p {
    margin-bottom: 1rem;
}

/* About & Contact Pages */
.page-content {
    max-width: 900px;
    margin: 0 auto;
    padding: 3rem 1.5rem;
}

.page-title {
    font-size: 2.5rem;
    color: var(--primary-color);
    margin-bottom: 2rem;
    text-align: center;
}

.contact-info {
    background: var(--light-bg);
    padding: 2rem;
    border-radius: 10px;
    margin-top: 2rem;
}

.contact-item {
    display: flex;
    align-items: center;
    gap: 1rem;
    margin-bottom: 1.5rem;
    font-size: 1.1rem;
}

.contact-item i {
    color: var(--accent-color);
    font-size: 1.5rem;
}

/* Footer */
footer {
    background: var(--primary-color);
    color: var(--white);
    padding: 3rem 0 1.5rem;
    margin-top: 4rem;
}

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

.footer-section h3 {
    margin-bottom: 1rem;
    font-size: 1.3rem;
}

.footer-section p,
.footer-section a {
    color: rgba(255,255,255,0.8);
    text-decoration: none;
    line-height: 1.8;
}

.footer-section a:hover {
    color: var(--white);
    text-decoration: underline;
}

.footer-links {
    list-style: none;
}

.footer-links li {
    margin-bottom: 0.5rem;
}

.footer-bottom {
    text-align: center;
    padding-top: 2rem;
    border-top: 1px solid rgba(255,255,255,0.1);
    color: rgba(255,255,255,0.8);
}

/* Breadcrumb */
.breadcrumb {
    padding: 1rem 0;
    background: var(--light-bg);
}

.breadcrumb-list {
    display: flex;
    list-style: none;
    gap: 0.5rem;
    flex-wrap: wrap;
}

.breadcrumb-list li {
    display: flex;
    align-items: center;
    gap: 0.5rem;
}

.breadcrumb-list a {
    color: var(--accent-color);
    text-decoration: none;
}

.breadcrumb-list a:hover {
    text-decoration: underline;
}

/* Loading Skeleton */
.skeleton {
    animation: skeleton-loading 1s linear infinite alternate;
}

@keyframes skeleton-loading {
    0% {
        background-color: hsl(200, 20%, 80%);
    }
    100% {
        background-color: hsl(200, 20%, 95%);
    }
}

/* Responsive Design */
@media (max-width: 768px) {
    .nav-links {
        position: fixed;
        left: -100%;
        top: 72px;
        flex-direction: column;
        background: var(--primary-color);
        width: 100%;
        padding: 2rem;
        transition: left 0.3s;
        box-shadow: var(--shadow);
    }

    .nav-links.active {
        left: 0;
    }

    .mobile-menu-btn {
        display: block;
    }

    .hero h1 {
        font-size: 2rem;
    }

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

    .section-title {
        font-size: 2rem;
    }

    .categories-grid,
    .wallpaper-grid,
    .blog-grid {
        grid-template-columns: 1fr;
    }

    .blog-post-title {
        font-size: 1.8rem;
    }

    .page-title {
        font-size: 2rem;
    }
}

@media (max-width: 480px) {
    .container {
        padding: 0 1rem;
    }

    .hero {
        padding: 3rem 0;
    }

    section {
        padding: 2rem 0;
    }

    .cta-button {
        padding: 0.8rem 2rem;
        font-size: 1rem;
    }
}

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

/* Print Styles */
@media print {
    header, footer, .cta-button, nav {
        display: none;
    }

    body {
        font-size: 12pt;
        color: #000;
    }
}