/* ========================================
   Agent Blog - Modern Technical Blog Theme
   ======================================== */

:root {
    /* Color System */
    --color-bg: #ffffff;
    --color-bg-secondary: #f8f9fa;
    --color-bg-tertiary: #f1f3f5;
    --color-text: #1a1a2e;
    --color-text-secondary: #4a4a68;
    --color-text-muted: #6c757d;
    --color-primary: #4f46e5;
    --color-primary-dark: #3730a3;
    --color-primary-light: #818cf8;
    --color-accent: #06b6d4;
    --color-border: #e5e7eb;
    --color-code-bg: #1e1e2e;
    --color-code-text: #cdd6f4;
    --shadow-sm: 0 1px 2px 0 rgb(0 0 0 / 0.05);
    --shadow-md: 0 4px 6px -1px rgb(0 0 0 / 0.1);
    --shadow-lg: 0 10px 15px -3px rgb(0 0 0 / 0.1);
    --radius-sm: 6px;
    --radius-md: 10px;
    --radius-lg: 16px;
}

@media (prefers-color-scheme: dark) {
    :root {
        --color-bg: #0f0f17;
        --color-bg-secondary: #1a1a2e;
        --color-bg-tertiary: #252542;
        --color-text: #e4e4ed;
        --color-text-secondary: #a8a8bc;
        --color-text-muted: #6c6c80;
        --color-border: #2d2d44;
        --color-code-bg: #0a0a12;
    }
}

/* Base Reset */
*, *::before, *::after {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

html {
    font-size: 16px;
    scroll-behavior: smooth;
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
}

body {
    font-family: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, 'Helvetica Neue', Arial, sans-serif;
    font-size: 1.0625rem;
    line-height: 1.75;
    color: var(--color-text);
    background-color: var(--color-bg);
    padding-top: 64px;
}

/* Typography Scale */
h1, h2, h3, h4, h5, h6 {
    font-family: 'Inter', -apple-system, BlinkMacSystemFont, sans-serif;
    font-weight: 700;
    line-height: 1.3;
    color: var(--color-text);
    margin-top: 2em;
    margin-bottom: 0.75em;
}

h1:first-child, h2:first-child, h3:first-child {
    margin-top: 0;
}

h1 {
    font-size: 2.5rem;
    font-weight: 800;
    letter-spacing: -0.02em;
    background: linear-gradient(135deg, var(--color-primary), var(--color-accent));
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

h2 {
    font-size: 1.75rem;
    font-weight: 700;
    border-bottom: 2px solid var(--color-border);
    padding-bottom: 0.5em;
}

h3 {
    font-size: 1.35rem;
    font-weight: 600;
    color: var(--color-primary);
}

h4 {
    font-size: 1.15rem;
    font-weight: 600;
}

p {
    margin-bottom: 1.5em;
}

a {
    color: var(--color-primary);
    text-decoration: none;
    transition: color 0.2s ease, border-color 0.2s ease;
    border-bottom: 1px solid transparent;
}

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

strong {
    font-weight: 600;
    color: var(--color-text);
}

/* Container */
.container {
    max-width: 800px;
    margin: 0 auto;
    padding: 0 24px;
}

@media (max-width: 768px) {
    .container {
        padding: 0 16px;
    }
}

/* ========================================
   Navigation
   ======================================== */

.navbar {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    z-index: 100;
    background: rgba(255, 255, 255, 0.85);
    backdrop-filter: blur(12px);
    -webkit-backdrop-filter: blur(12px);
    border-bottom: 1px solid var(--color-border);
    padding: 16px 0;
    transform: translateY(0);
    opacity: 1;
    transition: transform 0.35s cubic-bezier(0.4, 0, 0.2, 1), opacity 0.35s cubic-bezier(0.4, 0, 0.2, 1);
}

.navbar.hidden {
    transform: translateY(-100%);
    opacity: 0;
}

@media (prefers-color-scheme: dark) {
    .navbar {
        background: rgba(15, 15, 23, 0.9);
    }
}

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

.logo {
    font-size: 1.35rem;
    font-weight: 800;
    color: var(--color-text);
    text-decoration: none;
    border: none;
    display: flex;
    align-items: center;
    gap: 8px;
}

.logo::before {
    content: "◆";
    background: linear-gradient(135deg, var(--color-primary), var(--color-accent));
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.logo:hover {
    color: var(--color-primary);
    border: none;
}

.nav-links {
    list-style: none;
    display: flex;
    gap: 8px;
}

.nav-links a {
    color: var(--color-text-secondary);
    text-decoration: none;
    border: none;
    padding: 8px 16px;
    border-radius: var(--radius-sm);
    font-weight: 500;
    font-size: 0.95rem;
    transition: all 0.2s ease;
}

.nav-links a:hover {
    color: var(--color-primary);
    background: var(--color-bg-secondary);
    border: none;
}

/* ========================================
   Blog Index (Home)
   ======================================== */

.blog-index {
    padding-top: 60px;
    padding-bottom: 80px;
}

.blog-index h1 {
    font-size: 3rem;
    margin-bottom: 8px;
}

.subtitle {
    font-size: 1.25rem;
    color: var(--color-text-secondary);
    margin-bottom: 60px;
    font-weight: 400;
}

.posts-list {
    display: flex;
    flex-direction: column;
    gap: 32px;
}

.post-item {
    padding: 32px;
    background: var(--color-bg);
    border: 1px solid var(--color-border);
    border-radius: var(--radius-lg);
    transition: all 0.3s ease;
    position: relative;
    overflow: hidden;
}

.post-item::before {
    content: "";
    position: absolute;
    top: 0;
    left: 0;
    width: 4px;
    height: 100%;
    background: linear-gradient(180deg, var(--color-primary), var(--color-accent));
    opacity: 0;
    transition: opacity 0.3s ease;
}

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

.post-item:hover::before {
    opacity: 1;
}

.post-item h2 {
    font-size: 1.5rem;
    margin-top: 0;
    margin-bottom: 12px;
    border: none;
    padding: 0;
}

.post-item h2 a {
    color: var(--color-text);
    border: none;
}

.post-item h2 a:hover {
    color: var(--color-primary);
    border: none;
}

.post-meta {
    display: flex;
    align-items: center;
    gap: 16px;
    color: var(--color-text-muted);
    font-size: 0.9rem;
    margin-bottom: 16px;
}

.post-meta .date {
    display: flex;
    align-items: center;
    gap: 6px;
}

.post-meta .date::before {
    content: "📅";
    font-size: 0.85rem;
}

.post-excerpt {
    color: var(--color-text-secondary);
    line-height: 1.7;
    font-size: 1rem;
}

/* ========================================
   Blog Post
   ======================================== */

.blog-post {
    padding-top: 40px;
    padding-bottom: 80px;
}

.blog-post article {
    max-width: 100%;
}

.blog-post h1 {
    font-size: 2.75rem;
    margin-bottom: 16px;
    padding-bottom: 24px;
    border-bottom: 1px solid var(--color-border);
}

.blog-post .meta {
    display: flex;
    align-items: center;
    gap: 20px;
    color: var(--color-text-muted);
    font-size: 0.95rem;
    margin-bottom: 48px;
    padding: 12px 20px;
    background: var(--color-bg-secondary);
    border-radius: var(--radius-sm);
}

.blog-post .content {
    line-height: 1.85;
}

/* ========================================
   Content Elements
   ======================================== */

/* Blockquotes */
blockquote {
    position: relative;
    margin: 2em 0;
    padding: 24px 28px;
    background: linear-gradient(135deg, rgba(79, 70, 229, 0.05), rgba(6, 182, 212, 0.05));
    border-left: 4px solid var(--color-primary);
    border-radius: 0 var(--radius-md) var(--radius-md) 0;
    color: var(--color-text-secondary);
    font-style: normal;
}

blockquote strong {
    color: var(--color-primary);
}

blockquote p:last-child {
    margin-bottom: 0;
}

/* Lists */
ul, ol {
    margin: 1.5em 0;
    padding-left: 1.5em;
}

li {
    margin-bottom: 0.5em;
}

li::marker {
    color: var(--color-primary);
}

/* Horizontal Rule */
hr {
    border: none;
    height: 2px;
    background: linear-gradient(90deg, var(--color-primary), var(--color-accent), transparent);
    margin: 3em 0;
    opacity: 0.3;
}

/* Images */
img {
    max-width: 100%;
    height: auto;
    border-radius: var(--radius-md);
    margin: 2em 0;
    box-shadow: var(--shadow-md);
}

/* ========================================
   Code Blocks
   ======================================== */

code {
    font-family: 'SF Mono', 'Fira Code', 'JetBrains Mono', 'Consolas', monospace;
    font-size: 0.9em;
    background: var(--color-bg-tertiary);
    color: var(--color-primary-dark);
    padding: 3px 8px;
    border-radius: 4px;
    font-weight: 500;
}

@media (prefers-color-scheme: dark) {
    code {
        background: var(--color-bg-tertiary);
        color: var(--color-primary-light);
    }
}

pre {
    background: var(--color-code-bg);
    color: var(--color-code-text);
    padding: 24px;
    border-radius: var(--radius-md);
    overflow-x: auto;
    margin: 2em 0;
    font-family: 'SF Mono', 'Fira Code', 'JetBrains Mono', monospace;
    font-size: 0.9rem;
    line-height: 1.6;
    border: 1px solid rgba(255, 255, 255, 0.05);
    box-shadow: var(--shadow-md);
}

pre code {
    background: transparent;
    color: inherit;
    padding: 0;
    font-size: inherit;
    font-weight: 400;
}

/* Syntax highlighting hints */
pre .keyword { color: #cba6f7; }
pre .string { color: #a6e3a1; }
pre .comment { color: #6c7086; }
pre .number { color: #fab387; }
pre .function { color: #89b4fa; }

/* ========================================
   Tables
   ======================================== */

table {
    width: 100%;
    border-collapse: collapse;
    margin: 2em 0;
    font-size: 0.95rem;
    border-radius: var(--radius-md);
    overflow: hidden;
    box-shadow: var(--shadow-sm);
}

th, td {
    padding: 14px 18px;
    text-align: left;
    border-bottom: 1px solid var(--color-border);
}

th {
    background: linear-gradient(135deg, rgba(79, 70, 229, 0.08), rgba(6, 182, 212, 0.08));
    font-weight: 600;
    color: var(--color-text);
    font-size: 0.9rem;
    text-transform: uppercase;
    letter-spacing: 0.03em;
}

tr:nth-child(even) {
    background: var(--color-bg-secondary);
}

tr:hover {
    background: rgba(79, 70, 229, 0.04);
}

td {
    color: var(--color-text-secondary);
}

table code {
    font-size: 0.85rem;
}

/* ========================================
   Footer
   ======================================== */

.footer {
    background: var(--color-bg-secondary);
    border-top: 1px solid var(--color-border);
    padding: 40px 0;
    margin-top: 80px;
    text-align: center;
}

.footer p {
    color: var(--color-text-muted);
    font-size: 0.9rem;
    margin: 0;
}

/* ========================================
   Utility Classes
   ======================================== */

.back-link {
    display: inline-flex;
    align-items: center;
    gap: 8px;
    margin-top: 48px;
    padding: 12px 24px;
    background: var(--color-bg-secondary);
    color: var(--color-text-secondary);
    border-radius: var(--radius-sm);
    font-weight: 500;
    border: none;
    transition: all 0.2s ease;
}

.back-link:hover {
    background: var(--color-primary);
    color: white;
    border: none;
}

/* About & Projects */
.about-content, .projects-list {
    padding-top: 40px;
}

.project-item {
    padding: 32px;
    background: var(--color-bg);
    border: 1px solid var(--color-border);
    border-radius: var(--radius-lg);
    margin-bottom: 24px;
    transition: all 0.3s ease;
}

.project-item:hover {
    border-color: var(--color-primary);
    box-shadow: var(--shadow-md);
}

.project-item h2 {
    font-size: 1.5rem;
    margin-top: 0;
    margin-bottom: 12px;
    border: none;
    padding: 0;
}

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

@media (max-width: 768px) {
    h1 {
        font-size: 2rem;
    }
    
    h2 {
        font-size: 1.5rem;
    }
    
    .blog-index h1 {
        font-size: 2.25rem;
    }
    
    .blog-post h1 {
        font-size: 2rem;
    }
    
    .subtitle {
        font-size: 1.1rem;
    }
    
    .post-item {
        padding: 24px;
    }
    
    .nav-links a {
        padding: 6px 12px;
        font-size: 0.9rem;
    }
    
    pre {
        padding: 16px;
        font-size: 0.85rem;
        border-radius: var(--radius-sm);
    }
    
    table {
        font-size: 0.85rem;
    }
    
    th, td {
        padding: 10px 12px;
    }
    
    blockquote {
        padding: 16px 20px;
        margin: 1.5em -16px;
        border-radius: 0;
    }
}

@media (max-width: 480px) {
    .navbar .container {
        flex-direction: column;
        gap: 12px;
    }
    
    .nav-links {
        width: 100%;
        justify-content: center;
    }
}

/* ========================================
   Print Styles
   ======================================== */

@media print {
    .navbar, .footer {
        display: none;
    }
    
    body {
        font-size: 12pt;
        color: black;
    }
    
    a {
        color: black;
        text-decoration: underline;
    }
    
    pre, blockquote {
        border: 1px solid #999;
        page-break-inside: avoid;
    }
}