@import url('https://fonts.googleapis.com/css2?family=Noto+Sans+Devanagari:wght@300;400;600;700&family=Rajdhani:wght@500;600;700&family=Inter:wght@300;400;600&display=swap');

:root {
    /* Light Mode - Warm Paper Theme */
    --bg-color: #FAF8F5;
    --bg-secondary: #F5F2ED;
    --text-color: #2D2A26;
    --text-muted: #6B6560;
    --accent-color: #C45C26;
    --secondary-accent: #1A5F5A;
    --card-bg: rgba(255, 252, 248, 0.85);
    --card-border: rgba(45, 42, 38, 0.12);
    --font-hindi: 'Noto Sans Devanagari', sans-serif;
    --font-english: 'Inter', sans-serif;
    --font-heading: 'Rajdhani', sans-serif;
    
    --spacing-sm: 1rem;
    --spacing-md: 2rem;
    --spacing-lg: 4rem;
    --radius-md: 12px;
    --radius-lg: 20px;
    
    --glass-bg: rgba(255, 252, 248, 0.7);
    --glass-border: rgba(45, 42, 38, 0.1);
    --glass-blur: 8px;
    
    /* Shadow for light mode */
    --shadow-soft: 0 4px 20px rgba(45, 42, 38, 0.08);
    --shadow-hover: 0 8px 30px rgba(45, 42, 38, 0.12);
}

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

html {
    scroll-behavior: smooth;
}

body {
    background-color: var(--bg-color);
    background-image:
        radial-gradient(circle at 15% 25%, rgba(196, 92, 38, 0.04) 0%, transparent 50%),
        radial-gradient(circle at 85% 75%, rgba(26, 95, 90, 0.04) 0%, transparent 50%),
        linear-gradient(180deg, var(--bg-color) 0%, var(--bg-secondary) 100%);
    background-attachment: fixed;
    color: var(--text-color);
    font-family: var(--font-hindi);
    line-height: 1.8;
    font-size: 1.1rem;
    overflow-x: hidden;
    -webkit-font-smoothing: antialiased;
    min-height: 100vh;
}

/* Typography */
h1, h2, h3, h4, h5, h6 {
    font-family: var(--font-heading);
    color: var(--text-color);
    line-height: 1.3;
    margin-bottom: var(--spacing-sm);
}

h1 {
    font-size: clamp(2rem, 5vw, 3.5rem);
    text-transform: uppercase;
    font-weight: 700;
    letter-spacing: 1px;
    background: linear-gradient(135deg, var(--accent-color), var(--secondary-accent));
    -webkit-background-clip: text;
    background-clip: text;
    color: transparent;
    text-align: center;
    margin-bottom: 1rem;
    padding-bottom: 1rem;
}

h2 {
    font-size: 2rem;
    color: var(--accent-color);
    margin-top: var(--spacing-lg);
    border-bottom: 2px solid var(--card-border);
    padding-bottom: 0.5rem;
}

h3 {
    font-size: 1.5rem;
    color: var(--text-color);
    margin-top: var(--spacing-md);
}

h4 {
    font-size: 1.25rem;
    color: var(--secondary-accent);
}

p {
    margin-bottom: 1.5rem;
    color: var(--text-color);
    font-weight: 300;
}

a {
    color: var(--accent-color);
    text-decoration: none;
    transition: color 0.3s ease;
}

a:hover {
    color: var(--secondary-accent);
    text-decoration: underline;
}

/* Layout */
.container {
    width: 90%;
    max-width: 900px;
    margin: 0 auto;
    padding: var(--spacing-md) 0;
}

/* Header */
header {
    text-align: center;
    margin-bottom: var(--spacing-lg);
    padding: var(--spacing-md);
    background: var(--glass-bg);
    border: 1px solid var(--glass-border);
    border-radius: var(--radius-lg);
    backdrop-filter: blur(var(--glass-blur));
    box-shadow: var(--shadow-soft);
}

.blog-meta {
    font-family: var(--font-english);
    color: var(--text-muted);
    font-size: 0.9rem;
    display: flex;
    justify-content: center;
    flex-wrap: wrap;
    gap: 1rem;
}

.blog-meta span strong {
    color: var(--accent-color);
}

/* TOC */
.toc-container {
    background: var(--card-bg) !important;
    padding: 2rem !important;
    border-radius: var(--radius-lg) !important;
    border: 1px solid var(--card-border) !important;
    margin-bottom: var(--spacing-lg) !important;
    backdrop-filter: blur(5px);
}

.toc-container h3 {
    margin-top: 0;
    color: var(--accent-color) !important;
    font-size: 1.5rem;
    border-bottom: 1px solid var(--card-border);
    padding-bottom: 1rem;
    margin-bottom: 1rem;
}

.toc-container ul {
    list-style: none;
    padding-left: 0;
}

.toc-container li {
    margin-bottom: 0.8rem;
}

.toc-container a {
    color: var(--text-color);
    font-family: var(--font-heading);
    font-size: 1.1rem;
    text-decoration: none;
    transition: color 0.3s ease, padding-left 0.3s ease;
    display: block;
}

.toc-container a:hover {
    color: var(--accent-color);
    padding-left: 10px;
}

/* Images & Figures */
figure {
    margin: 2rem 0;
    text-align: center;
}

img {
    max-width: 100%;
    height: auto;
    border-radius: var(--radius-md);
    border: 1px solid var(--card-border);
    box-shadow: var(--shadow-soft);
    transition: transform 0.3s ease, box-shadow 0.3s ease;
}

img:hover {
    transform: scale(1.02);
}

/* Cards (Content Boxes) */
.card {
    background: var(--card-bg);
    border: 1px solid var(--card-border);
    border-radius: var(--radius-md);
    padding: 2rem;
    margin: 2rem 0;
    transition: transform 0.3s ease, box-shadow 0.3s ease;
    box-shadow: var(--shadow-soft);
    backdrop-filter: blur(4px);
}

.card:hover {
    transform: translateY(-5px);
    box-shadow: var(--shadow-hover);
    border-color: var(--accent-color);
}

/* Lists */
ul, ol {
    margin-bottom: 1.5rem;
    padding-left: 2rem;
}

li {
    margin-bottom: 0.5rem;
}

/* Blockquotes */
blockquote {
    border-left: 4px solid var(--accent-color);
    padding-left: 1.5rem;
    margin: 2rem 0;
    font-style: italic;
    color: var(--text-muted);
    background: var(--bg-secondary);
    padding: 1.5rem;
    border-radius: 0 var(--radius-md) var(--radius-md) 0;
}

/* Back to Top Button */
#back-to-top {
    position: fixed;
    bottom: 30px;
    right: 30px;
    background: var(--accent-color);
    color: #fff;
    border: none;
    border-radius: 50%;
    width: 50px;
    height: 50px;
    font-size: 1.5rem;
    cursor: pointer;
    box-shadow: var(--shadow-hover);
    opacity: 0;
    visibility: hidden;
    transition: all 0.3s ease;
    z-index: 1000;
    display: flex;
    align-items: center;
    justify-content: center;
}

#back-to-top.visible {
    opacity: 1;
    visibility: visible;
}

#back-to-top:hover {
    transform: translateY(-5px);
    background: var(--secondary-accent);
    box-shadow: 0 0 20px rgba(26, 95, 90, 0.4);
}

/* Footer */
footer {
    margin-top: var(--spacing-lg);
    padding-top: var(--spacing-md);
    border-top: 1px solid var(--card-border);
    text-align: center;
    color: var(--text-muted);
    font-size: 0.9rem;
}

/* QR Code Section */
.qr-code-container {
    text-align: center;
    padding: 1.5rem;
    margin: 2rem 0;
    background: var(--card-bg);
    border-radius: var(--radius-md);
    border: 1px solid var(--card-border);
    box-shadow: var(--shadow-soft);
}

.qr-code-img {
    max-width: 200px;
    height: auto;
    border: 2px solid var(--accent-color);
    border-radius: var(--radius-md);
    padding: 5px;
    background: #fff;
    transition: transform 0.3s ease;
}

.qr-code-img:hover {
    transform: scale(1.05);
    box-shadow: 0 0 20px rgba(196, 92, 38, 0.2);
}

/* Mobile Adjustments */
@media (max-width: 768px) {
    .container {
        width: 95%;
    }
    
    h1 {
        font-size: 2rem;
    }
    
    h2 {
        font-size: 1.75rem;
    }
    
    .card {
        padding: 1.5rem;
    }
}