/* ===========================
   CSS Reset & Base Styles
   =========================== */

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

:root {
    /* Colors - Warm, natural, newspaper-inspired */
    --primary-color: #8b5a3c;        /* Warm brown/terracotta */
    --primary-hover: #6b4430;        /* Darker brown */
    --accent-color: #5a7c5a;         /* Forest green accent */
    --text-primary: #2c2416;         /* Warm charcoal, not pure black */
    --text-secondary: #6b5d4f;       /* Warm gray-brown */
    --text-light: #9a8d7f;           /* Lighter warm gray */
    --bg-primary: #fefcf8;           /* Warm cream/ivory */
    --bg-secondary: #f8f5f0;         /* Slightly warmer background */
    --bg-tertiary: #f0ede6;          /* Subtle warm gray */
    --border-color: #e0d9cf;         /* Warm, soft border */
    --shadow-sm: 0 1px 3px 0 rgba(44, 36, 22, 0.08);
    --shadow-md: 0 2px 8px 0 rgba(44, 36, 22, 0.12);
    --shadow-lg: 0 4px 16px 0 rgba(44, 36, 22, 0.15);

    /* Typography - Editorial, newspaper feel */
    --font-serif: 'Charter', 'Georgia', 'Times New Roman', serif;
    --font-sans: -apple-system, BlinkMacSystemFont, 'Segoe UI', 'Helvetica Neue', Arial, sans-serif;
    --font-mono: 'SF Mono', Monaco, 'Cascadia Code', 'Courier New', monospace;

    /* Spacing - More generous, editorial */
    --spacing-xs: 0.25rem;
    --spacing-sm: 0.5rem;
    --spacing-md: 1rem;
    --spacing-lg: 1.5rem;
    --spacing-xl: 2rem;
    --spacing-2xl: 3rem;
    --spacing-3xl: 4rem;
    --spacing-4xl: 5rem;

    /* Layout */
    --max-width: 900px;               /* Narrower, more focused reading */
    --max-width-wide: 1200px;         /* For grid layouts */
    --border-radius: 0.25rem;         /* Subtle, less rounded */
    --transition: all 0.2s ease;
}

html {
    font-size: 18px;                  /* Larger base for readability */
    scroll-behavior: smooth;
}

body {
    font-family: var(--font-serif);   /* Serif for body text */
    color: var(--text-primary);
    background-color: var(--bg-secondary);
    background-image: 
        radial-gradient(circle at 1px 1px, rgba(44, 36, 22, 0.015) 1px, transparent 0);
    background-size: 20px 20px;      /* Subtle paper texture */
    line-height: 1.75;                /* More generous line height */
    min-height: 100vh;
    display: flex;
    flex-direction: column;
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
}

/* ===========================
   Typography
   =========================== */

h1, h2, h3, h4, h5, h6 {
    font-family: var(--font-sans);    /* Sans-serif for headings */
    font-weight: 600;                 /* Slightly lighter weight */
    line-height: 1.3;
    margin-bottom: var(--spacing-md);
    color: var(--text-primary);
    letter-spacing: -0.01em;          /* Tighter letter spacing */
}

h1 { font-size: 2.75rem; }
h2 { font-size: 2.25rem; }
h3 { font-size: 1.875rem; }
h4 { font-size: 1.5rem; }
h5 { font-size: 1.25rem; }
h6 { font-size: 1.125rem; }

p {
    margin-bottom: var(--spacing-lg);  /* More space between paragraphs */
    font-size: 1.125rem;               /* Slightly larger body text */
}

a {
    color: var(--primary-color);
    text-decoration: underline;
    text-decoration-color: rgba(139, 90, 60, 0.3);
    text-underline-offset: 0.2em;
    transition: var(--transition);
}

a:hover {
    color: var(--primary-hover);
    text-decoration-color: rgba(107, 68, 48, 0.5);
}

code {
    font-family: var(--font-mono);
    background-color: var(--bg-tertiary);
    padding: 0.125rem 0.375rem;
    border-radius: 0.25rem;
    font-size: 0.9em;
    color: var(--text-primary);
    border: 1px solid var(--border-color);
}

pre {
    background-color: var(--text-primary);
    color: var(--bg-primary);
    padding: var(--spacing-xl);
    border-radius: var(--border-radius);
    overflow-x: auto;
    margin: var(--spacing-xl) 0;
    border: 1px solid var(--border-color);
    box-shadow: var(--shadow-sm);
}

pre code {
    background-color: transparent;
    padding: 0;
    color: inherit;
    border: none;
}

blockquote {
    border-left: 3px solid var(--primary-color);
    padding-left: var(--spacing-xl);
    margin: var(--spacing-xl) 0;
    color: var(--text-secondary);
    font-style: italic;
    font-size: 1.125rem;
    background-color: var(--bg-tertiary);
    padding: var(--spacing-lg) var(--spacing-xl);
    border-radius: var(--border-radius);
}

/* ===========================
   Layout Components
   =========================== */

.container {
    max-width: var(--max-width);
    margin: 0 auto;
    padding: 0 var(--spacing-xl);
    width: 100%;
}

.container-wide {
    max-width: var(--max-width-wide);
    margin: 0 auto;
    padding: 0 var(--spacing-xl);
    width: 100%;
}

/* Header */
.site-header {
    background-color: rgba(254, 252, 248, 0.95);  /* Slightly transparent */
    backdrop-filter: blur(10px);
    border-bottom: 1px solid var(--border-color);
    padding: var(--spacing-xl) 0;
    position: sticky;
    top: 0;
    z-index: 100;
    box-shadow: var(--shadow-sm);
}

.site-header .container {
    display: flex;
    justify-content: space-between;
    align-items: center;
    max-width: 1200px;
}

.site-title a {
    font-family: var(--font-sans);
    font-size: 1.25rem;
    font-weight: 400;
    color: var(--text-primary);
    text-decoration: none;
    letter-spacing: 0;
}

.site-nav ul {
    display: flex;
    list-style: none;
    gap: var(--spacing-xl);
    margin: 0;
    padding: 0;
}

.site-nav li {
    margin: 0;
}

.site-nav a {
    font-family: var(--font-sans);
    color: var(--text-secondary);
    font-weight: 400;
    font-size: 0.9375rem;
    padding: 0;
    transition: var(--transition);
    text-decoration: none;
    position: relative;
}

.site-nav a:hover,
.site-nav a.active {
    color: var(--text-primary);
}

.site-nav a.active::after {
    content: '';
    position: absolute;
    bottom: -4px;
    left: 0;
    right: 0;
    height: 1px;
    background-color: var(--text-primary);
}

/* Main Content */
.site-main {
    flex: 1;
    padding: var(--spacing-3xl) 0;
}

/* Footer */
.site-footer {
    background-color: var(--bg-primary);
    border-top: 1px solid var(--border-color);
    padding: var(--spacing-xl) 0;
    margin-top: auto;
    text-align: center;
    color: var(--text-secondary);
}

.site-footer p {
    margin-bottom: var(--spacing-sm);
}

.footer-links {
    display: flex;
    justify-content: center;
    gap: var(--spacing-lg);
}

.footer-links a {
    color: var(--text-secondary);
}

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

/* ===========================
   Post Grid
   =========================== */

.posts-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(320px, 1fr));
    gap: var(--spacing-2xl);
    margin-bottom: var(--spacing-3xl);
}

.post-card {
    background-color: var(--bg-primary);
    border-radius: var(--border-radius);
    padding: var(--spacing-2xl);
    box-shadow: var(--shadow-sm);
    transition: var(--transition);
    border: 1px solid var(--border-color);
}

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

.post-card h3 {
    margin-bottom: var(--spacing-sm);
}

.post-card h3 a {
    color: var(--text-primary);
    text-decoration: none;
}

.post-card h3 a:hover {
    color: var(--primary-color);
    text-decoration: underline;
    text-decoration-color: rgba(139, 90, 60, 0.3);
}

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

.post-meta-item {
    display: flex;
    align-items: center;
    gap: var(--spacing-xs);
}

.post-excerpt {
    color: var(--text-secondary);
    margin-bottom: var(--spacing-md);
    line-height: 1.6;
}

.post-tags {
    display: flex;
    flex-wrap: wrap;
    gap: var(--spacing-sm);
}

/* ===========================
   Post Detail
   =========================== */

.post-detail {
    background-color: var(--bg-primary);
    border-radius: var(--border-radius);
    padding: var(--spacing-4xl) var(--spacing-2xl);
    box-shadow: var(--shadow-sm);
    border: 1px solid var(--border-color);
    max-width: 700px;                 /* Narrower for better reading */
    margin: 0 auto;
}

.post-header {
    margin-bottom: var(--spacing-2xl);
    padding-bottom: var(--spacing-xl);
    border-bottom: 1px solid var(--border-color);
}

.post-header h1 {
    margin-bottom: var(--spacing-md);
    font-size: 2.5rem;
}

.post-content {
    font-size: 1.125rem;
    line-height: 1.85;                 /* Generous line height for reading */
    color: var(--text-primary);
}

.post-content p {
    margin-bottom: var(--spacing-xl);   /* More space between paragraphs */
}

.post-content img {
    max-width: 100%;
    height: auto;
    border-radius: var(--border-radius);
    margin: var(--spacing-xl) 0;
    box-shadow: var(--shadow-sm);
    border: 1px solid var(--border-color);
}

.post-content ul,
.post-content ol {
    margin-bottom: var(--spacing-xl);
    padding-left: var(--spacing-2xl);
}

.post-content li {
    margin-bottom: var(--spacing-md);
    line-height: 1.8;
}

.back-link {
    display: inline-flex;
    align-items: center;
    gap: var(--spacing-sm);
    margin-bottom: var(--spacing-2xl);
    color: var(--primary-color);
    font-weight: 500;
    font-family: var(--font-sans);
    text-decoration: none;
}

.back-link:hover {
    gap: var(--spacing-md);
    text-decoration: underline;
    text-decoration-color: rgba(139, 90, 60, 0.3);
}

/* ===========================
   Tags
   =========================== */

.tag {
    display: inline-block;
    background-color: var(--bg-tertiary);
    color: var(--text-secondary);
    padding: var(--spacing-xs) var(--spacing-md);
    border-radius: 9999px;
    font-size: 0.875rem;
    font-weight: 500;
    font-family: var(--font-sans);
    transition: var(--transition);
    text-decoration: none;
    border: 1px solid transparent;
}

.tag:hover {
    background-color: var(--primary-color);
    color: var(--bg-primary);
    border-color: var(--primary-hover);
}

.tags-grid {
    display: flex;
    flex-wrap: wrap;
    gap: var(--spacing-md);
    margin-bottom: var(--spacing-2xl);
}

.tag-large {
    padding: var(--spacing-sm) var(--spacing-lg);
    font-size: 1rem;
}

/* ===========================
   Page Header
   =========================== */

.page-header {
    margin-bottom: var(--spacing-3xl);
    text-align: center;
    padding-bottom: var(--spacing-2xl);
    border-bottom: 1px solid var(--border-color);
}

.page-header h1 {
    font-size: 3rem;
    margin-bottom: var(--spacing-md);
}

.page-header p {
    font-size: 1.25rem;
    color: var(--text-secondary);
    font-style: italic;
}

/* ===========================
   Utility Components
   =========================== */

.loading {
    text-align: center;
    padding: var(--spacing-3xl);
}

.spinner {
    width: 48px;
    height: 48px;
    border: 4px solid var(--bg-tertiary);
    border-top-color: var(--primary-color);
    border-radius: 50%;
    animation: spin 1s linear infinite;
    margin: 0 auto var(--spacing-md);
}

@keyframes spin {
    to { transform: rotate(360deg); }
}

.error-message {
    background-color: #fef2f2;
    border: 1px solid #fecaca;
    color: #991b1b;
    padding: var(--spacing-xl);
    border-radius: var(--border-radius);
    text-align: center;
    font-family: var(--font-sans);
}

.error-message h2 {
    color: #991b1b;
    margin-bottom: var(--spacing-md);
    font-family: var(--font-sans);
}

.error-message button {
    margin-top: var(--spacing-md);
    padding: var(--spacing-sm) var(--spacing-lg);
    background-color: var(--primary-color);
    color: var(--bg-primary);
    border: 1px solid var(--primary-hover);
    border-radius: var(--border-radius);
    cursor: pointer;
    font-size: 1rem;
    font-weight: 500;
    font-family: var(--font-sans);
    transition: var(--transition);
}

.error-message button:hover {
    background-color: var(--primary-hover);
}

.empty-state {
    text-align: center;
    padding: var(--spacing-3xl);
    color: var(--text-secondary);
}

.empty-state h2 {
    color: var(--text-secondary);
    font-size: 1.5rem;
    margin-bottom: var(--spacing-md);
}

/* ===========================
   Responsive Design
   =========================== */

/* Tablet */
@media (max-width: 768px) {
    html {
        font-size: 17px;
    }

    :root {
        --spacing-xl: 1.5rem;
        --spacing-2xl: 2rem;
        --spacing-3xl: 2.5rem;
        --spacing-4xl: 3rem;
    }

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

    .site-header .container {
        flex-direction: column;
        gap: var(--spacing-md);
    }

    .site-nav ul {
        gap: var(--spacing-md);
    }

    .post-detail {
        padding: var(--spacing-2xl) var(--spacing-xl);
    }

    .page-header h1 {
        font-size: 2.25rem;
    }

    .post-header h1 {
        font-size: 2.25rem;
    }

    h1 { font-size: 2.25rem; }
    h2 { font-size: 2rem; }
    h3 { font-size: 1.75rem; }
}

/* Mobile */
@media (max-width: 480px) {
    html {
        font-size: 16px;
    }

    .container,
    .container-wide {
        padding: 0 var(--spacing-lg);
    }

    .post-card {
        padding: var(--spacing-xl);
    }

    .post-meta {
        flex-direction: column;
        gap: var(--spacing-xs);
    }

    .site-nav ul {
        width: 100%;
        justify-content: center;
    }

    .post-detail {
        padding: var(--spacing-xl) var(--spacing-lg);
    }

    .post-content {
        font-size: 1.0625rem;
    }

    .page-header h1 {
        font-size: 2rem;
    }

    .post-header h1 {
        font-size: 2rem;
    }
}

/* Background theme selector (for future enhancement) */
/* Users can change background texture/pattern here */
body.theme-paper {
    background-image: 
        radial-gradient(circle at 1px 1px, rgba(44, 36, 22, 0.015) 1px, transparent 0);
    background-size: 20px 20px;
}

body.theme-linen {
    background-image: 
        repeating-linear-gradient(
            45deg,
            transparent,
            transparent 2px,
            rgba(44, 36, 22, 0.01) 2px,
            rgba(44, 36, 22, 0.01) 4px
        );
}

body.theme-clean {
    background-image: none;
}

/* Dark mode support (optional - can be enabled later) */
@media (prefers-color-scheme: dark) {
    /* Uncomment to enable dark mode
    :root {
        --primary-color: #c9a882;
        --primary-hover: #b8956f;
        --text-primary: #f5f0e8;
        --text-secondary: #d4c9b8;
        --text-light: #b8ad9d;
        --bg-primary: #2a241c;
        --bg-secondary: #1f1a14;
        --bg-tertiary: #353028;
        --border-color: #4a4238;
    }
    */
}