/* 
  Custom Modern Stylesheet for www.gungormehmet.com
  Features: Fluid design, robust typography, custom animations, native light/dark mode variables, and full responsiveness.
*/

:root {
    --bg-primary: #f8fafc;
    --bg-secondary: #ffffff;
    --border-color: #e2e8f0;
    
    --text-primary: #0f172a;
    --text-secondary: #475569;
    --text-muted: #94a3b8;
    
    --accent-color: #2563eb;
    --accent-hover: #1d4ed8;
    --accent-gradient: linear-gradient(135deg, #2563eb 0%, #3b82f6 100%);
    --accent-soft: rgba(37, 99, 235, 0.08);
    
    --code-bg: #1e293b;
    --code-text: #f8fafc;
    
    --shadow-sm: 0 1px 2px 0 rgba(0, 0, 0, 0.05);
    --shadow-md: 0 4px 6px -1px rgba(0, 0, 0, 0.1), 0 2px 4px -1px rgba(0, 0, 0, 0.06);
    --shadow-lg: 0 10px 15px -3px rgba(0, 0, 0, 0.1), 0 4px 6px -2px rgba(0, 0, 0, 0.05);
    
    --font-sans: 'Inter', system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;
    --font-mono: 'Fira Code', 'Courier New', Courier, monospace;
    
    --transition-speed: 0.25s;
    --border-radius: 12px;
}

/* Dark Mode Variables override */
body.dark-mode {
    --bg-primary: #0f172a;
    --bg-secondary: #1e293b;
    --border-color: #334155;
    
    --text-primary: #f8fafc;
    --text-secondary: #cbd5e1;
    --text-muted: #64748b;
    
    --accent-color: #60a5fa;
    --accent-hover: #93c5fd;
    --accent-gradient: linear-gradient(135deg, #3b82f6 0%, #60a5fa 100%);
    --accent-soft: rgba(96, 165, 250, 0.12);
    
    --code-bg: #0b0f19;
    --code-text: #f1f5f9;
    
    --shadow-sm: 0 1px 2px 0 rgba(0, 0, 0, 0.3);
    --shadow-md: 0 4px 6px -1px rgba(0, 0, 0, 0.4), 0 2px 4px -1px rgba(0, 0, 0, 0.3);
    --shadow-lg: 0 10px 15px -3px rgba(0, 0, 0, 0.5), 0 4px 6px -2px rgba(0, 0, 0, 0.3);
}

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

body {
    background-color: var(--bg-primary);
    color: var(--text-primary);
    font-family: var(--font-sans);
    line-height: 1.625;
    -webkit-font-smoothing: antialiased;
    transition: background-color var(--transition-speed), color var(--transition-speed);
}

/* Layout container */
.container {
    max-width: 1040px;
    margin: 0 auto;
    padding: 0 1.5rem;
}

.article-container {
    max-width: 760px;
    margin: 0 auto;
    padding: 0 1.5rem;
}

/* Header & Navigation */
header {
    background-color: rgba(255, 255, 255, 0.8);
    backdrop-filter: blur(8px);
    -webkit-backdrop-filter: blur(8px);
    border-bottom: 1px solid var(--border-color);
    position: sticky;
    top: 0;
    z-index: 100;
    transition: background-color var(--transition-speed), border-color var(--transition-speed);
}

body.dark-mode header {
    background-color: rgba(15, 23, 42, 0.8);
}

.nav-wrapper {
    display: flex;
    justify-content: space-between;
    align-items: center;
    height: 70px;
}

.logo {
    font-size: 1.25rem;
    font-weight: 700;
    color: var(--text-primary);
    text-decoration: none;
    letter-spacing: -0.025em;
    display: flex;
    align-items: center;
    gap: 0.5rem;
}

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

.nav-links {
    display: flex;
    align-items: center;
    gap: 1.5rem;
}

.nav-links a {
    color: var(--text-secondary);
    text-decoration: none;
    font-weight: 500;
    font-size: 0.95rem;
    transition: color var(--transition-speed);
}

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

/* Theme Toggle Button */
.theme-toggle {
    background: none;
    border: 1px solid var(--border-color);
    width: 40px;
    height: 40px;
    border-radius: 50%;
    cursor: pointer;
    display: flex;
    align-items: center;
    justify-content: center;
    color: var(--text-secondary);
    transition: border-color var(--transition-speed), background-color var(--transition-speed), color var(--transition-speed);
}

.theme-toggle:hover {
    border-color: var(--accent-color);
    background-color: var(--accent-soft);
    color: var(--accent-color);
}

.theme-toggle svg {
    width: 20px;
    height: 20px;
    fill: currentColor;
}

.sun-icon { display: none; }
.moon-icon { display: block; }

body.dark-mode .sun-icon { display: block; }
body.dark-mode .moon-icon { display: none; }

/* Hero Section */
.hero {
    padding: 5rem 0 4rem;
    text-align: left;
    border-bottom: 1px solid var(--border-color);
    margin-bottom: 3.5rem;
}

.hero-content {
    max-width: 680px;
}

.hero h1 {
    font-size: 3rem;
    font-weight: 800;
    line-height: 1.15;
    letter-spacing: -0.03em;
    margin-bottom: 1rem;
    color: var(--text-primary);
}

.hero h1 span {
    background: var(--accent-gradient);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
}

.hero p {
    font-size: 1.25rem;
    color: var(--text-secondary);
    margin-bottom: 1.5rem;
    font-weight: 400;
    line-height: 1.6;
}

.social-links {
    display: flex;
    gap: 1rem;
    align-items: center;
}

.social-btn {
    display: inline-flex;
    align-items: center;
    gap: 0.5rem;
    padding: 0.6rem 1.2rem;
    border: 1px solid var(--border-color);
    border-radius: var(--border-radius);
    text-decoration: none;
    color: var(--text-secondary);
    font-size: 0.9rem;
    font-weight: 500;
    transition: background-color var(--transition-speed), border-color var(--transition-speed), color var(--transition-speed);
}

.social-btn:hover {
    border-color: var(--accent-color);
    background-color: var(--accent-soft);
    color: var(--accent-color);
}

.social-btn svg {
    width: 18px;
    height: 18px;
    fill: currentColor;
}

/* Post Grid / Lists */
.section-title {
    font-size: 1.5rem;
    font-weight: 700;
    margin-bottom: 1.5rem;
    letter-spacing: -0.02em;
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.posts-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(320px, 1fr));
    gap: 1.75rem;
    margin-bottom: 4rem;
}

.post-card {
    background-color: var(--bg-secondary);
    border: 1px solid var(--border-color);
    border-radius: var(--border-radius);
    padding: 1.75rem;
    display: flex;
    flex-direction: column;
    justify-content: space-between;
    box-shadow: var(--shadow-sm);
    transition: transform 0.2s ease, box-shadow 0.2s ease, border-color var(--transition-speed);
    text-decoration: none;
    color: inherit;
}

.post-card:hover {
    transform: translateY(-4px);
    box-shadow: var(--shadow-md);
    border-color: var(--accent-color);
}

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

.post-date-row {
    display: flex;
    align-items: center;
    gap: 0.75rem;
    margin-bottom: 0.75rem;
    font-size: 0.8rem;
    color: var(--text-muted);
    font-weight: 500;
}

.post-tag {
    background-color: var(--accent-soft);
    color: var(--accent-color);
    padding: 0.2rem 0.6rem;
    border-radius: 20px;
    font-size: 0.75rem;
    font-weight: 600;
}

.post-card h2 {
    font-size: 1.35rem;
    font-weight: 700;
    line-height: 1.3;
    margin-bottom: 0.75rem;
    color: var(--text-primary);
    transition: color var(--transition-speed);
}

.post-card:hover h2 {
    color: var(--accent-color);
}

.post-card p {
    font-size: 0.95rem;
    color: var(--text-secondary);
    line-height: 1.5;
    margin-bottom: 1.5rem;
}

.read-more-link {
    font-size: 0.9rem;
    font-weight: 600;
    color: var(--accent-color);
    display: flex;
    align-items: center;
    gap: 0.25rem;
}

.read-more-link svg {
    width: 16px;
    height: 16px;
    transition: transform 0.2s ease;
}

.post-card:hover .read-more-link svg {
    transform: translateX(4px);
}

/* Main Article Page */
.post-header {
    padding: 3rem 0 2.5rem;
    border-bottom: 1px solid var(--border-color);
    margin-bottom: 2.5rem;
}

.post-header .back-link {
    display: inline-flex;
    align-items: center;
    gap: 0.5rem;
    text-decoration: none;
    color: var(--text-secondary);
    font-size: 0.9rem;
    font-weight: 500;
    margin-bottom: 1.5rem;
    transition: color var(--transition-speed);
}

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

.post-header .back-link svg {
    width: 16px;
    height: 16px;
}

.post-header h1 {
    font-size: 2.5rem;
    font-weight: 800;
    line-height: 1.2;
    letter-spacing: -0.03em;
    margin-bottom: 1rem;
    color: var(--text-primary);
}

.post-meta-details {
    display: flex;
    align-items: center;
    gap: 1rem;
    font-size: 0.9rem;
    color: var(--text-secondary);
}

.post-meta-details .tags-wrapper {
    display: flex;
    gap: 0.5rem;
}

/* Article Markdown Typography Rendering */
.article-body {
    font-size: 1.125rem;
    line-height: 1.777;
    color: var(--text-secondary);
    margin-bottom: 5rem;
}

.article-body h1,
.article-body h2,
.article-body h3,
.article-body h4 {
    color: var(--text-primary);
    font-weight: 700;
    line-height: 1.25;
    margin-top: 2.25rem;
    margin-bottom: 1rem;
    letter-spacing: -0.02em;
}

.article-body h1 { font-size: 1.8rem; }
.article-body h2 { font-size: 1.5rem; border-bottom: 1px solid var(--border-color); padding-bottom: 0.5rem; }
.article-body h3 { font-size: 1.25rem; }

.article-body p {
    margin-bottom: 1.5rem;
}

.article-body strong {
    color: var(--text-primary);
    font-weight: 600;
}

.article-body ul,
.article-body ol {
    margin-bottom: 1.5rem;
    padding-left: 1.5rem;
}

.article-body li {
    margin-bottom: 0.5rem;
}

.article-body blockquote {
    font-style: italic;
    border-left: 4px solid var(--accent-color);
    padding: 0.5rem 0 0.5rem 1.25rem;
    margin: 1.5rem 0;
    color: var(--text-primary);
    background-color: var(--accent-soft);
    border-radius: 0 var(--border-radius) var(--border-radius) 0;
}

.article-body a {
    color: var(--accent-color);
    text-decoration: underline;
    text-underline-offset: 4px;
    font-weight: 500;
    transition: color var(--transition-speed);
}

.article-body a:hover {
    color: var(--accent-hover);
}

/* Code Syntax & Pre styling */
.article-body pre {
    background-color: var(--code-bg);
    color: var(--code-text);
    border-radius: var(--border-radius);
    padding: 1.25rem;
    overflow-x: auto;
    font-family: var(--font-mono);
    font-size: 0.9rem;
    line-height: 1.5;
    margin: 1.5rem 0;
    border: 1px solid var(--border-color);
}

.article-body code {
    font-family: var(--font-mono);
    font-size: 0.9em;
    background-color: var(--bg-secondary);
    border: 1px solid var(--border-color);
    color: var(--text-primary);
    padding: 0.15rem 0.35rem;
    border-radius: 4px;
}

.article-body pre code {
    background-color: transparent;
    border: none;
    color: inherit;
    padding: 0;
    border-radius: 0;
    font-size: inherit;
}

.article-body hr {
    border: 0;
    height: 1px;
    background-color: var(--border-color);
    margin: 3rem 0;
}

/* Footer styling */
footer {
    border-top: 1px solid var(--border-color);
    padding: 3rem 0;
    margin-top: auto;
    background-color: var(--bg-secondary);
    transition: background-color var(--transition-speed), border-color var(--transition-speed);
}

.footer-wrapper {
    display: flex;
    justify-content: space-between;
    align-items: center;
    flex-wrap: wrap;
    gap: 1rem;
}

.footer-text {
    font-size: 0.9rem;
    color: var(--text-muted);
}

.footer-links {
    display: flex;
    gap: 1.5rem;
}

.footer-links a {
    color: var(--text-muted);
    text-decoration: none;
    font-size: 0.9rem;
    transition: color var(--transition-speed);
}

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

/* About Me section at home */
.about-me-section {
    padding: 3.5rem 1.75rem;
    background-color: var(--bg-secondary);
    border: 1px solid var(--border-color);
    border-radius: var(--border-radius);
    margin-bottom: 5rem;
    box-shadow: var(--shadow-sm);
    transition: background-color var(--transition-speed), border-color var(--transition-speed);
}

.about-me-grid {
    display: grid;
    grid-template-columns: 1fr;
    gap: 2rem;
}

@media (min-width: 768px) {
    .about-me-grid {
        grid-template-columns: 2fr 1fr;
    }
}

.about-me-content h3 {
    font-size: 1.5rem;
    font-weight: 700;
    margin-bottom: 1rem;
}

.about-me-content p {
    font-size: 1.05rem;
    color: var(--text-secondary);
    margin-bottom: 1rem;
}

.skills-list {
    display: flex;
    flex-wrap: wrap;
    gap: 0.5rem;
    margin-top: 1.5rem;
}

.skill-tag {
    background-color: var(--bg-primary);
    border: 1px solid var(--border-color);
    color: var(--text-secondary);
    padding: 0.35rem 0.85rem;
    border-radius: 20px;
    font-size: 0.85rem;
    font-weight: 500;
}

.about-me-sidebar {
    border-left: none;
    padding-left: 0;
}

@media (min-width: 768px) {
    .about-me-sidebar {
        border-left: 1px solid var(--border-color);
        padding-left: 2rem;
    }
}

.sidebar-title {
    font-weight: 700;
    font-size: 1.1rem;
    margin-bottom: 1rem;
}

.sidebar-info-row {
    margin-bottom: 0.75rem;
    font-size: 0.95rem;
    color: var(--text-secondary);
}

.sidebar-info-row strong {
    color: var(--text-primary);
}

/* Responsive adjustments */
@media (max-width: 768px) {
    .hero h1 {
        font-size: 2.25rem;
    }
    .hero {
        padding: 3rem 0 2.5rem;
        margin-bottom: 2rem;
    }
    .post-header h1 {
        font-size: 2rem;
    }
    .footer-wrapper {
        flex-direction: column;
        text-align: center;
    }
}