/*
Theme Name: ThreeJSTraining
Theme URI: https://threejs.training
Author: Akshay
Author URI: https://threejs.training
Description: A custom, lightweight, SEO-optimized WordPress theme for Three.js and WebGL learning. Features dark mode, Three.js integration, and a modern developer-focused UI.
Version: 1.0.0
License: GNU General Public License v2 or later
License URI: http://www.gnu.org/licenses/gpl-2.0.html
Text Domain: threejstraining
Tags: education, threejs, dark-mode, responsive, custom-post-types
*/

:root {
    /* Color Palette - Light Mode */
    --color-bg-primary: #ffffff;
    --color-bg-secondary: #f3f4f6;
    --color-text-main: #111827;
    --color-text-muted: #6b7280;
    --color-accent: #6366f1; /* Indigo */
    --color-accent-hover: #4f46e5;
    --color-border: #e5e7eb;
    
    /* Code & Syntax */
    --color-code-bg: #1e1e1e;
    --color-code-text: #d4d4d4;

    /* Spacing */
    --container-width: 1200px;
    --container-padding: 1.5rem;
    --header-height: 70px;
    --radius-sm: 4px;
    --radius-md: 8px;
    --radius-lg: 16px;
    
    /* Fonts */
    --font-heading: 'Inter', -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, sans-serif;
    --font-body: 'Inter', -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, sans-serif;
    --font-mono: 'JetBrains Mono', 'Fira Code', monospace;
}

[data-theme="dark"] {
    /* Color Palette - Dark Mode */
    --color-bg-primary: #0f172a; /* Slate 900 */
    --color-bg-secondary: #1e293b; /* Slate 800 */
    --color-text-main: #f8fafc;
    --color-text-muted: #94a3b8;
    --color-accent: #818cf8;
    --color-accent-hover: #6366f1;
    --color-border: #334155;
}

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

body {
    background-color: var(--color-bg-primary);
    color: var(--color-text-main);
    font-family: var(--font-body);
    line-height: 1.6;
    transition: background-color 0.3s ease, color 0.3s ease;
}

h1, h2, h3, h4, h5, h6 {
    font-family: var(--font-heading);
    font-weight: 700;
    line-height: 1.25;
    margin-bottom: 1rem;
}

a {
    color: var(--color-accent);
    text-decoration: none;
    transition: color 0.2s ease;
}

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

img {
    max-width: 100%;
    height: auto;
    display: block;
}

/* Utility Classes */
.container {
    max-width: var(--container-width);
    margin: 0 auto;
    padding: 0 var(--container-padding);
}

.btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    padding: 0.75rem 1.5rem;
    background-color: var(--color-accent);
    color: #ffffff;
    border-radius: var(--radius-md);
    font-weight: 600;
    cursor: pointer;
    transition: transform 0.2s ease, box-shadow 0.2s ease;
    border: none;
}

.btn:hover {
    transform: translateY(-2px);
    box-shadow: 0 4px 12px rgba(99, 102, 241, 0.3);
}

.btn-secondary {
    background-color: var(--color-bg-secondary);
    color: var(--color-text-main);
    border: 1px solid var(--color-border);
}

.glass-card {
    background: rgba(255, 255, 255, 0.05); /* very subtle default */
}
[data-theme="dark"] .glass-card {
    background: rgba(30, 41, 59, 0.6);
}
.glass-effect {
    backdrop-filter: blur(10px);
    -webkit-backdrop-filter: blur(10px);
    border: 1px solid var(--color-border);
}

/* Header */
.site-header {
    height: var(--header-height);
    position: sticky;
    top: 0;
    z-index: 50;
    background-color: var(--color-bg-primary);
    border-bottom: 1px solid var(--color-border);
    display: flex;
    align-items: center;
    justify-content: center; /* container handles inside */
    transition: background-color 0.3s ease;
}
.site-header .container {
    width: 100%;
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.site-logo {
    font-size: 1.5rem;
    font-weight: 800;
    color: var(--color-text-main);
    font-family: var(--font-heading);
    letter-spacing: -0.02em;
}

.main-navigation ul {
    display: flex;
    list-style: none;
    gap: 2rem;
}

.main-navigation a {
    color: var(--color-text-muted);
    font-weight: 500;
}
.main-navigation a:hover {
    color: var(--color-text-main);
}