/* Reset & Base */
* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

html {
    scroll-behavior: smooth;
}

/* Theme Variables */
:root {
    --bg-primary: #ffffff;
    --bg-secondary: #f9fafb;
    --bg-tertiary: #f3f4f6;
    --text-primary: #111827;
    --text-secondary: #6b7280;
    --border-color: #e5e7eb;
    --accent-color: #ff6b6b;
    --accent-hover: #ee5a24;
    --shadow-soft: 0 4px 20px rgba(0,0,0,0.08);
    --shadow-accent: 0 6px 20px rgba(238,90,36,0.3);
    --code-bg: #1f2937;
    --code-text: #e5e7eb;
}

[data-theme="dark"] {
    --bg-primary: #111827;
    --bg-secondary: #1f2937;
    --bg-tertiary: #374151;
    --text-primary: #f9fafb;
    --text-secondary: #9ca3af;
    --border-color: #374151;
    --accent-color: #ff8f8f;
    --accent-hover: #ff6b6b;
    --code-bg: #0f172a;
    --code-text: #e5e7eb;
}

/* Theme transition styles */
html.theme-transitioning * {
    transition: background-color 300ms ease-in-out,
                color 300ms ease-in-out,
                border-color 300ms ease-in-out !important;
}

body {
    font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, Oxygen, Ubuntu, Cantarell, sans-serif;
    line-height: 1.6;
    color: var(--text-primary);
    background: linear-gradient(135deg, #fff5e6 0%, #ffe5cc 100%);
    transition: background-color .3s ease, color .3s ease;
    min-height: 100vh;
    display: flex;
    flex-direction: column;
}

[data-theme="dark"] body {
    background: linear-gradient(135deg, #0f172a 0%, #1e293b 100%);
}

/* Header */
.header {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    z-index: 1000;
    background-color: rgba(255, 255, 255, 0.95);
    backdrop-filter: blur(10px);
    border-bottom: 1px solid var(--border-color);
    padding: 0 2rem;
    box-shadow: var(--shadow-soft);
}

[data-theme="dark"] .header {
    background-color: rgba(17, 24, 39, 0.95);
}

.header-content {
    max-width: 1400px;
    margin: 0 auto;
    display: flex;
    align-items: center;
    justify-content: space-between;
    height: 64px;
}

.logo {
    display: flex;
    align-items: center;
    gap: 0.5rem;
    text-decoration: none;
    color: var(--text-primary);
    font-weight: 700;
    font-size: 1.5rem;
    transition: color 0.2s;
}

.logo:hover {
    color: var(--accent-color);
}

.logo-icon {
    font-size: 2rem;
}

.header-nav {
    display: flex;
    align-items: center;
    gap: 2rem;
}

.nav-link {
    color: var(--text-secondary);
    text-decoration: none;
    font-weight: 500;
    transition: color 0.2s;
}

.nav-link:hover {
    color: var(--accent-color);
}

.header-controls {
    display: flex;
    align-items: center;
    gap: 1rem;
}

.theme-toggle {
    width: 40px;
    height: 40px;
    border: none;
    background: none;
    cursor: pointer;
    border-radius: 8px;
    display: flex;
    align-items: center;
    justify-content: center;
    transition: background-color 0.2s ease;
    color: var(--text-primary);
}

.theme-toggle:hover {
    background-color: var(--bg-tertiary);
}

.theme-toggle svg {
    width: 20px;
    height: 20px;
    color: var(--text-primary);
    transition: transform 0.3s ease;
}

.theme-toggle:active svg {
    transform: rotate(180deg);
}

[data-theme="light"] .moon-icon { display: block; }
[data-theme="light"] .sun-icon { display: none; }
[data-theme="dark"] .moon-icon { display: none; }
[data-theme="dark"] .sun-icon { display: block; }

/* Main Content */
.main-content {
    flex: 1;
    margin-top: 64px;
    padding: 2rem;
}

/* Hero Small */
.hero-small {
    padding: 60px 2rem 40px;
    text-align: center;
    background: linear-gradient(135deg, var(--accent-color), var(--accent-hover));
    color: white;
    border-radius: 16px;
    margin: 0 auto 3rem;
    max-width: 1400px;
}

.hero-content h1 {
    font-size: 3rem;
    margin-bottom: 1rem;
    font-weight: 800;
}

.hero-content p {
    font-size: 1.25rem;
    opacity: 0.95;
}

/* Posts Section */
.posts-section {
    max-width: 1400px;
    margin: 0 auto;
}

.posts-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(350px, 1fr));
    gap: 2rem;
    margin-bottom: 3rem;
}

/* Post Card */
.post-card {
    background: var(--bg-primary);
    border-radius: 16px;
    padding: 2rem;
    box-shadow: var(--shadow-soft);
    border: 2px solid var(--bg-tertiary);
    transition: all 0.3s;
    display: flex;
    flex-direction: column;
}

.post-card:hover {
    transform: translateY(-5px);
    box-shadow: var(--shadow-accent);
    border-color: var(--accent-color);
}

.post-card-header {
    margin-bottom: 1rem;
}

.post-card-header time {
    color: var(--text-secondary);
    font-size: 0.875rem;
    font-weight: 500;
}

.post-card-title {
    font-size: 1.5rem;
    margin-bottom: 1rem;
    line-height: 1.3;
}

.post-card-title a {
    color: var(--text-primary);
    text-decoration: none;
    transition: color 0.2s;
}

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

.post-card-description {
    color: var(--text-secondary);
    margin-bottom: 1rem;
    line-height: 1.6;
    flex-grow: 1;
}

.post-card-tags {
    display: flex;
    flex-wrap: wrap;
    gap: 0.5rem;
    margin-bottom: 1rem;
}

.tag {
    background: var(--bg-tertiary);
    color: var(--text-secondary);
    padding: 0.25rem 0.75rem;
    border-radius: 20px;
    font-size: 0.75rem;
    font-weight: 500;
}

.post-card-link {
    color: var(--accent-color);
    text-decoration: none;
    font-weight: 600;
    transition: color 0.2s;
    display: inline-block;
}

.post-card-link:hover {
    color: var(--accent-hover);
}

/* Pagination */
.pagination {
    display: flex;
    justify-content: center;
    align-items: center;
    gap: 2rem;
    padding: 2rem 0;
}

.pagination-btn {
    padding: 0.75rem 1.5rem;
    background: var(--bg-primary);
    color: var(--text-primary);
    text-decoration: none;
    border-radius: 8px;
    border: 2px solid var(--border-color);
    font-weight: 600;
    transition: all 0.2s;
}

.pagination-btn:hover {
    border-color: var(--accent-color);
    color: var(--accent-color);
    transform: translateY(-2px);
    box-shadow: var(--shadow-soft);
}

.pagination-info {
    color: var(--text-secondary);
    font-weight: 500;
}

/* Single Post */
.post-single {
    max-width: 800px;
    margin: 0 auto;
    background: var(--bg-primary);
    border-radius: 16px;
    padding: 3rem;
    box-shadow: var(--shadow-soft);
}

.post-header {
    margin-bottom: 3rem;
    padding-bottom: 2rem;
    border-bottom: 2px solid var(--border-color);
}

.post-meta {
    display: flex;
    gap: 1rem;
    margin-bottom: 1rem;
    color: var(--text-secondary);
    font-size: 0.875rem;
}

.post-author::before {
    content: "•";
    margin-right: 0.5rem;
}

.post-title {
    font-size: 2.5rem;
    line-height: 1.2;
    margin-bottom: 1rem;
    color: var(--text-primary);
}

.post-description {
    font-size: 1.25rem;
    color: var(--text-secondary);
    margin-bottom: 1.5rem;
}

.post-tags {
    display: flex;
    flex-wrap: wrap;
    gap: 0.5rem;
}

/* Markdown Content Styles */
.markdown-content {
    color: var(--text-primary);
    line-height: 1.8;
}

.markdown-content h1,
.markdown-content h2,
.markdown-content h3,
.markdown-content h4,
.markdown-content h5,
.markdown-content h6 {
    margin: 2rem 0 1rem;
    line-height: 1.3;
    color: var(--text-primary);
    font-weight: 700;
}

.markdown-content h1 { font-size: 2.25rem; }
.markdown-content h2 { font-size: 1.875rem; }
.markdown-content h3 { font-size: 1.5rem; }
.markdown-content h4 { font-size: 1.25rem; }
.markdown-content h5 { font-size: 1.125rem; }
.markdown-content h6 { font-size: 1rem; }

.markdown-content p {
    margin: 1rem 0;
}

.markdown-content a {
    color: var(--accent-color);
    text-decoration: none;
    border-bottom: 1px solid transparent;
    transition: border-color 0.2s;
}

.markdown-content a:hover {
    border-bottom-color: var(--accent-color);
}

.markdown-content ul,
.markdown-content ol {
    margin: 1rem 0;
    padding-left: 2rem;
}

.markdown-content li {
    margin: 0.5rem 0;
}

.markdown-content blockquote {
    margin: 1.5rem 0;
    padding: 1rem 1.5rem;
    border-left: 4px solid var(--accent-color);
    background: var(--bg-secondary);
    border-radius: 0 8px 8px 0;
    color: var(--text-secondary);
    font-style: italic;
}

.markdown-content code {
    background: var(--bg-tertiary);
    padding: 0.2rem 0.4rem;
    border-radius: 4px;
    font-family: 'Monaco', 'Menlo', 'Courier New', monospace;
    font-size: 0.875em;
    color: var(--accent-color);
}

.markdown-content pre {
    background: var(--code-bg);
    color: var(--code-text);
    padding: 1.5rem;
    border-radius: 8px;
    overflow-x: auto;
    margin: 1.5rem 0;
    border: 2px solid var(--accent-color);
}

.markdown-content pre code {
    background: none;
    padding: 0;
    color: inherit;
    border-radius: 0;
}

.markdown-content img {
    max-width: 100%;
    height: auto;
    border-radius: 8px;
    margin: 1.5rem 0;
}

.markdown-content hr {
    border: none;
    border-top: 2px solid var(--border-color);
    margin: 2rem 0;
}

.markdown-content table {
    width: 100%;
    border-collapse: collapse;
    margin: 1.5rem 0;
}

.markdown-content th,
.markdown-content td {
    padding: 0.75rem;
    border: 1px solid var(--border-color);
    text-align: left;
}

.markdown-content th {
    background: var(--bg-secondary);
    font-weight: 600;
}

.markdown-content tr:nth-child(even) {
    background: var(--bg-secondary);
}

/* Post Footer */
.post-footer {
    margin-top: 3rem;
    padding-top: 2rem;
    border-top: 2px solid var(--border-color);
}

/* Buttons */
.btn {
    padding: 0.75rem 1.5rem;
    border-radius: 8px;
    text-decoration: none;
    font-weight: 600;
    transition: all 0.3s;
    display: inline-block;
    border: none;
    cursor: pointer;
}

.btn-secondary {
    background: transparent;
    color: var(--accent-color);
    border: 2px solid var(--accent-color);
}

.btn-secondary:hover {
    background: var(--accent-color);
    color: white;
    transform: translateY(-2px);
    box-shadow: var(--shadow-soft);
}

/* Footer */
.footer {
    background: var(--bg-secondary);
    padding: 2rem;
    text-align: center;
    border-top: 1px solid var(--border-color);
    margin-top: 4rem;
}

.copyright {
    color: var(--text-secondary);
    font-size: 0.9rem;
}

/* Responsive */
@media (max-width: 768px) {
    .hero-content h1 {
        font-size: 2rem;
    }
    
    .hero-content p {
        font-size: 1rem;
    }
    
    .posts-grid {
        grid-template-columns: 1fr;
    }
    
    .post-single {
        padding: 2rem 1.5rem;
    }
    
    .post-title {
        font-size: 2rem;
    }
    
    .header-nav {
        display: none;
    }
    
    .pagination {
        flex-direction: column;
        gap: 1rem;
    }
}