:root {
    /* Google Brand Colors */
    --color-google-blue: #4285F4;
    --color-google-red: #EA4335;
    --color-google-yellow: #FBBC04;
    --color-google-green: #34A853;

    /* Theme Colors - Light Mode (Default) */
    --bg-body: #FFFFFF;
    --bg-surface: #F8F9FA;
    --text-primary: #202124;
    --text-secondary: #5F6368;
    --border-color: #DADCE0;

    /* Typography */
    --font-primary: 'Google Sans Flex', 'Inter', -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
    --font-mono: 'Roboto Mono', monospace;

    /* Spacing */
    --spacing-xs: 4px;
    --spacing-sm: 8px;
    --spacing-md: 16px;
    --spacing-lg: 24px;
    --spacing-xl: 32px;
    --spacing-xxl: 64px;

    /* Border Radius */
    --radius-sm: 4px;
    --radius-md: 8px;
    --radius-lg: 16px;
    --radius-pill: 999px;

    /* Transitions */
    --transition-fast: 0.2s ease;
    --transition-normal: 0.3s ease;
    --transition-smooth: 0.5s cubic-bezier(0.4, 0, 0.2, 1);
}

/* Dark Mode Overrides */
[data-theme="dark"] {
    --bg-body: #121212;
    /* Deep Black */
    --bg-surface: #1E1E1E;
    --text-primary: #E8EAED;
    --text-secondary: #9AA0A6;
    --border-color: #3C4043;
}

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

body {
    background-color: var(--bg-body);
    color: var(--text-primary);
    font-family: var(--font-primary);
    font-size: 16px;
    line-height: 1.5;
    transition: background-color var(--transition-normal), color var(--transition-normal);
    -webkit-font-smoothing: antialiased;
}

h1,
h2,
h3,
h4,
h5,
h6 {
    font-family: var(--font-primary);
    font-weight: 500;
    line-height: 1.2;
    margin-bottom: var(--spacing-md);
    color: var(--text-primary);
}

a {
    color: inherit;
    text-decoration: none;
    transition: color var(--transition-fast);
}

/* Container */
.container {
    width: 100%;
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 var(--spacing-lg);
}

/* Screen Reader Text */
.screen-reader-text {
    border: 0;
    clip: rect(1px, 1px, 1px, 1px);
    -webkit-clip-path: inset(50%);
    clip-path: inset(50%);
    height: 1px;
    margin: -1px;
    overflow: hidden;
    padding: 0;
    position: absolute;
    width: 1px;
    word-wrap: normal !important;
}

/* Header Styles */
.site-header {
    position: sticky;
    top: 0;
    z-index: 1000;
    background-color: rgba(255, 255, 255, 0.8);
    /* Light mode glass */
    backdrop-filter: blur(10px);
    -webkit-backdrop-filter: blur(10px);
    border-bottom: 1px solid transparent;
    transition: all var(--transition-normal);
}

[data-theme="dark"] .site-header {
    background-color: rgba(18, 18, 18, 0.8);
    /* Dark mode glass */
    border-bottom: 1px solid rgba(255, 255, 255, 0.05);
}

.header-inner {
    display: flex;
    align-items: center;
    justify-content: space-between;
    height: 80px;
}

.site-title {
    font-size: 24px;
    font-weight: 500;
    /* Google Sans Medium */
    margin: 0;
}

/* Navigation */
.main-navigation ul {
    list-style: none;
    display: flex;
    gap: var(--spacing-sm);
    margin: 0;
    padding: 0;
}

.main-navigation a {
    display: block;
    padding: 8px 16px;
    border-radius: var(--radius-pill);
    font-size: 14px;
    font-weight: 500;
    color: var(--text-secondary);
    transition: all var(--transition-fast);
}

.main-navigation a:hover,
[data-theme="dark"] .main-navigation a:hover {
    background-color: var(--bg-surface);
    color: var(--text-primary);
}

/* Actions */
.header-actions {
    display: flex;
    align-items: center;
    gap: var(--spacing-md);
}

.btn-icon {
    background: none;
    border: none;
    cursor: pointer;
    color: var(--text-primary);
    padding: 8px;
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    transition: background-color var(--transition-fast);
}

.btn-icon:hover {
    background-color: var(--bg-surface);
}

/* Dark Mode Icon Toggle Logic */
.icon-moon {
    display: none;
}

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

[data-theme="dark"] .icon-moon {
    display: block;
}

.btn-primary {
    background-color: #1A73E8;
    /* Google Blue fallback */
    color: white;
    padding: 10px 24px;
    border-radius: var(--radius-pill);
    font-weight: 500;
    font-size: 14px;
}

[data-theme="dark"] .btn-primary {
    background-color: white;
    color: black;
}

/* Particle Canvas */
.particle-container {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100vh;
    z-index: -1;
    pointer-events: none;
    /* Let clicks pass through */
}

#particle-canvas {
    display: block;
    width: 100%;
    height: 100%;
}

/* Hero Section */
.hero-section {
    min-height: 80vh;
    display: flex;
    align-items: center;
    justify-content: center;
    text-align: center;
    padding: var(--spacing-xl) 0;
    position: relative;
    z-index: 1;
}

.hero-title {
    font-size: 4rem;
    font-weight: 500;
    line-height: 1.1;
    letter-spacing: -1px;
    margin-bottom: var(--spacing-xl);
}

@media (max-width: 768px) {
    .hero-title {
        font-size: 2.5rem;
    }
}

.cursor {
    font-weight: 100;
    opacity: 1;
    animation: blink 1s infinite;
}

@keyframes blink {

    0%,
    100% {
        opacity: 1;
    }

    50% {
        opacity: 0;
    }
}

/* Hero Buttons */
.hero-buttons {
    display: flex;
    gap: var(--spacing-md);
    justify-content: center;
    opacity: 0;
    transform: translateY(20px);
    transition: all 0.8s ease;
}

.hero-buttons.visible {
    opacity: 1;
    transform: translateY(0);
}

.btn {
    display: inline-flex;
    align-items: center;
    height: 48px;
    padding: 0 32px;
    border-radius: var(--radius-pill);
    font-weight: 500;
    transition: transform var(--transition-fast);
}

.btn:hover {
    transform: scale(1.05);
}

.btn-secondary {
    background-color: var(--bg-surface);
    color: var(--text-primary);
}

/* Blog Grid */
.blog-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(300px, 1fr));
    gap: var(--spacing-lg);
    padding-top: var(--spacing-xxl);
    padding-bottom: var(--spacing-xxl);
}

.post-card {
    background: var(--bg-surface);
    border-radius: var(--radius-lg);
    overflow: hidden;
    height: 100%;
    transition: transform var(--transition-normal), box-shadow var(--transition-normal);
    border: 1px solid transparent;
}

.post-card:hover {
    transform: translateY(-5px);
    box-shadow: 0 10px 30px rgba(0, 0, 0, 0.1);
}

[data-theme="dark"] .post-card:hover {
    border-color: rgba(255, 255, 255, 0.1);
    box-shadow: 0 10px 30px rgba(0, 0, 0, 0.3);
}

.post-thumbnail img {
    width: 100%;
    height: 200px;
    object-fit: cover;
}

.entry-header {
    padding: var(--spacing-md);
}

.entry-title {
    font-size: 1.25rem;
    margin-bottom: var(--spacing-sm);
}

.entry-excerpt {
    padding: 0 var(--spacing-md) var(--spacing-md);
    color: var(--text-secondary);
    font-size: 0.95rem;
}

.read-more {
    display: inline-block;
    margin-top: var(--spacing-sm);
    color: var(--color-google-blue);
    font-weight: 500;
}

/* Footer */
.site-footer {
    padding: var(--spacing-xl) 0;
    border-top: 1px solid var(--border-color);
    margin-top: auto;
    font-size: 0.9rem;
    color: var(--text-secondary);
}

.site-info {
    display: flex;
    justify-content: space-between;
    flex-wrap: wrap;
    gap: var(--spacing-md);
}

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

@media (max-width: 600px) {
    .site-info {
        flex-direction: column;
        align-items: center;
        text-align: center;
    }
}