:root {
    /* Colors */
    --color-primary: #158A8A;
    --color-primary-hover: #0D6B6B;
    --color-primary-light: #E0F2F1;

    --color-success: #10B981;
    --color-warning: #F59E0B;
    --color-danger: #EF4444;

    --color-neutral-50: #F8FAFC;
    --color-neutral-100: #F1F5F9;
    --color-neutral-200: #E2E8F0;
    --color-neutral-300: #CBD5E1;
    --color-neutral-400: #94A3B8;
    --color-neutral-500: #64748B;
    --color-neutral-600: #475569;
    --color-neutral-700: #334155;
    --color-neutral-800: #1E293B;
    --color-neutral-900: #0F172A;

    /* Spacing */
    --spacing-xs: 4px;
    --spacing-sm: 8px;
    --spacing-md: 12px;
    --spacing-lg: 16px;
    --spacing-xl: 20px;
    --spacing-2xl: 24px;
    --spacing-3xl: 32px;
    --spacing-4xl: 40px;

    /* Radius */
    --radius-sm: 8px;
    --radius-md: 8px;
    --radius-lg: 12px;
    --radius-xl: 16px;

    /* Shadows */
    --shadow-sm: 0 1px 2px 0 rgb(0 0 0 / 0.05);
    --shadow-md: 0 4px 6px -1px rgb(0 0 0 / 0.1), 0 2px 4px -2px rgb(0 0 0 / 0.1);
    --shadow-lg: 0 10px 15px -3px rgb(0 0 0 / 0.1), 0 4px 6px -4px rgb(0 0 0 / 0.1);
    --shadow-xl: 0 20px 25px -5px rgb(0 0 0 / 0.1), 0 8px 10px -6px rgb(0 0 0 / 0.1);

    /* Typography */
    --font-family: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
}

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

html,
body {
    height: 100%;
}

body {
    font-family: var(--font-family);
    background-color: var(--color-neutral-50);
    color: var(--color-neutral-700);
    display: flex;
    flex-direction: column;
    line-height: 1.6;
    -webkit-font-smoothing: antialiased;
}

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

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

/* Header */
.header {
    background: rgba(255, 255, 255, 0.8);
    backdrop-filter: blur(8px);
    border-bottom: 1px solid var(--color-neutral-200);
    padding: var(--spacing-lg) var(--spacing-3xl);
    display: flex;
    justify-content: space-between;
    align-items: center;
    position: sticky;
    top: 0;
    z-index: 100;
}

.header-left {
    display: flex;
    align-items: center;
    gap: var(--spacing-xl);
}

.logo {
    height: 32px;
    width: auto;
    display: flex;
    align-items: center;
    transition: opacity 0.2s;
}

.logo:hover {
    opacity: 0.8;
}

.logo img {
    height: 32px;
    width: auto;
}

.nav-links {
    display: flex;
    gap: var(--spacing-2xl);
    list-style: none;
}

.nav-links a {
    color: var(--color-neutral-600);
    text-decoration: none;
    font-size: 14px;
    font-weight: 500;
    transition: color 0.2s;
}

.nav-links a:hover {
    color: var(--color-neutral-900);
}

.header-right {
    display: flex;
    align-items: center;
    gap: var(--spacing-lg);
}

.btn {
    padding: var(--spacing-md) var(--spacing-lg);
    border-radius: var(--radius-md);
    border: none;
    font-size: 14px;
    font-weight: 500;
    cursor: pointer;
    transition: all 0.2s ease;
    text-decoration: none;
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: var(--spacing-xs);
    font-family: var(--font-family);
    line-height: 1;
}

.btn-ghost {
    background: transparent;
    color: var(--color-neutral-600);
}

.btn-ghost:hover {
    background: var(--color-neutral-100);
    color: var(--color-neutral-900);
}

.btn-primary {
    background: var(--color-primary);
    color: white;
    box-shadow: 0 1px 2px rgba(0, 0, 0, 0.05);
}

.btn-primary:hover {
    background: var(--color-primary-hover);
    transform: translateY(-1px);
    box-shadow: var(--shadow-md);
}

.btn-primary:active {
    transform: translateY(0);
}

.btn-primary-large {
    padding: 12px 24px;
    font-weight: 600;
}

/* Main Content */
.main {
    flex: 1;
    width: 100%;
    max-width: 1200px;
    margin: 0 auto;
    padding: var(--spacing-4xl) var(--spacing-xl);
    display: grid;
    grid-template-columns: 1fr;
    gap: var(--spacing-4xl);
}

@media (min-width: 1024px) {
    .main {
        grid-template-columns: 3fr 1fr;
    }
}

/* Posts List */
.post-list {
    display: flex;
    flex-direction: column;
    gap: var(--spacing-2xl);
}

.post-card {
    background: white;
    border-radius: var(--radius-lg);
    padding: var(--spacing-2xl);
    box-shadow: var(--shadow-sm);
    border: 1px solid var(--color-neutral-200);
    transition: all 0.3s ease;
}

.post-card:hover {
    transform: translateY(-2px);
    box-shadow: var(--shadow-md);
    border-color: var(--color-neutral-300);
}

.post-title {
    font-size: 24px;
    font-weight: 700;
    color: var(--color-neutral-900);
    margin-bottom: var(--spacing-sm);
}

.post-title a {
    color: var(--color-neutral-900);
}

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

.post-meta {
    font-size: 14px;
    color: var(--color-neutral-500);
    margin-bottom: var(--spacing-md);
    display: flex;
    gap: var(--spacing-md);
    align-items: center;
}

.post-excerpt {
    color: var(--color-neutral-600);
    margin-bottom: var(--spacing-xl);
    display: -webkit-box;
    -webkit-line-clamp: 3;
    line-clamp: 3;
    -webkit-box-orient: vertical;
    overflow: hidden;
}

.read-more-btn {
    display: inline-flex;
    align-items: center;
    gap: var(--spacing-xs);
    font-weight: 600;
    font-size: 14px;
}

/* Single Post */
.post-content {
    background: white;
    border-radius: var(--radius-lg);
    padding: var(--spacing-3xl);
    box-shadow: var(--shadow-sm);
    border: 1px solid var(--color-neutral-200);
}

.post-header {
    margin-bottom: var(--spacing-3xl);
    text-align: center;
}

.post-header .post-title {
    font-size: 32px;
    margin-bottom: var(--spacing-md);
}

.post-body {
    font-size: 16px;
    color: var(--color-neutral-800);
}

.post-body h2 {
    font-size: 24px;
    margin-top: var(--spacing-2xl);
    margin-bottom: var(--spacing-md);
    color: var(--color-neutral-900);
}

.post-body h3 {
    font-size: 20px;
    margin-top: var(--spacing-xl);
    margin-bottom: var(--spacing-sm);
    color: var(--color-neutral-900);
}

.post-body p {
    margin-bottom: var(--spacing-lg);
}

.post-body ul,
.post-body ol {
    margin-bottom: var(--spacing-lg);
    padding-left: var(--spacing-xl);
}

.post-body blockquote {
    border-left: 4px solid var(--color-primary);
    padding-left: var(--spacing-lg);
    margin: var(--spacing-xl) 0;
    color: var(--color-neutral-600);
    font-style: italic;
}

.post-body img {
    max-width: 100%;
    border-radius: var(--radius-md);
    margin: var(--spacing-lg) 0;
}

/* Sidebar */
.sidebar {
    display: flex;
    flex-direction: column;
    gap: var(--spacing-xl);
}

.widget {
    background: white;
    border-radius: var(--radius-lg);
    padding: var(--spacing-xl);
    border: 1px solid var(--color-neutral-200);
}

.widget-title {
    font-size: 16px;
    font-weight: 700;
    color: var(--color-neutral-900);
    margin-bottom: var(--spacing-lg);
    padding-bottom: var(--spacing-sm);
    border-bottom: 1px solid var(--color-neutral-100);
}

.widget-list {
    list-style: none;
}

.widget-list-item {
    margin-bottom: var(--spacing-sm);
}

.widget-list-link {
    color: var(--color-neutral-600);
    font-size: 14px;
    display: flex;
    justify-content: space-between;
}

.widget-list-link:hover {
    color: var(--color-primary);
}

.widget-list-count {
    background: var(--color-neutral-100);
    padding: 2px 8px;
    border-radius: 12px;
    font-size: 12px;
    color: var(--color-neutral-500);
}

/* Pagination */
.pagination {
    display: flex;
    justify-content: center;
    gap: var(--spacing-sm);
    margin-top: var(--spacing-3xl);
}

.page-number,
.extend {
    display: flex;
    align-items: center;
    justify-content: center;
    width: 40px;
    height: 40px;
    border-radius: var(--radius-md);
    background: white;
    border: 1px solid var(--color-neutral-200);
    color: var(--color-neutral-600);
    font-weight: 500;
    transition: all 0.2s;
}

.page-number.current {
    background: var(--color-primary);
    color: white;
    border-color: var(--color-primary);
}

.page-number:hover:not(.current),
.extend:hover {
    border-color: var(--color-primary);
    color: var(--color-primary);
}

/* Footer */
.footer {
    background: white;
    border-top: 1px solid var(--color-neutral-200);
    padding: var(--spacing-4xl) var(--spacing-3xl) var(--spacing-2xl);
    margin-top: auto;
}

.footer-content {
    max-width: 1200px;
    margin: 0 auto;
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: var(--spacing-3xl);
    margin-bottom: var(--spacing-4xl);
}

.footer-column h3 {
    font-size: 12px;
    font-weight: 600;
    text-transform: uppercase;
    letter-spacing: 0.5px;
    color: var(--color-neutral-900);
    margin-bottom: var(--spacing-lg);
}

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

.footer-column ul li {
    margin-bottom: var(--spacing-md);
}

.footer-column ul li a {
    color: var(--color-neutral-500);
    text-decoration: none;
    font-size: 13px;
    transition: color 0.2s;
}

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

.footer-bottom {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding-top: var(--spacing-2xl);
    border-top: 1px solid var(--color-neutral-200);
    max-width: 1200px;
    margin: 0 auto;
}

.footer-bottom-left {
    display: flex;
    gap: var(--spacing-2xl);
    align-items: center;
}

.footer-logo {
    font-size: 16px;
    font-weight: 700;
    color: var(--color-primary);
    letter-spacing: -0.5px;
}

.footer-copyright {
    font-size: 12px;
    color: var(--color-neutral-400);
}

.footer-bottom-right {
    display: flex;
    gap: var(--spacing-xl);
}

.footer-link {
    font-size: 12px;
    color: var(--color-neutral-500);
    text-decoration: none;
    transition: color 0.2s;
}

.footer-link:hover {
    color: var(--color-neutral-900);
}

/* Responsive */
@media (max-width: 768px) {
    .header {
        padding: var(--spacing-lg);
    }

    .header-left {
        gap: var(--spacing-lg);
    }

    .nav-links {
        display: none;
    }

    .main {
        padding: var(--spacing-lg);
    }

    .footer-content {
        grid-template-columns: 1fr 1fr;
        gap: var(--spacing-2xl);
    }

    .footer-bottom {
        flex-direction: column;
        gap: var(--spacing-lg);
        align-items: flex-start;
    }

    .footer-bottom-right {
        flex-direction: column;
        gap: var(--spacing-md);
    }
}