/* 
    Global Theme Variables
    Defining colors, fonts, and common scales for consistency and easy scaling.
*/

:root {
    /* Dark Theme (Default) */
    --primary-color: #8ab4f8;
    --secondary-color: #4da3ff;
    --accent-color: #ffcc00; /* Gold/Yellow for highlights */
    --background-color: #0f0f0f;
    --text-color: #e5e5e5;
    --text-muted: #a0a0a0;
    --white: #1a1a1a;
    --shadow-color: rgba(0, 0, 0, 0.4);
    --border-color: #2a2a2a;
    --header-bg: #1a1a1a;
    --header-text: #e5e5e5;
    --card-bg: #1a1a1a;
    --inline-code-bg: #262626;
    --badge-color: #ffffff;
    --badge-bg: #2a2a2a;
    --code-block-bg: #ffffff;
    --code-block-text: #1a1a1a;

    /* Typography */
    --font-main: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
    --font-heading: 'Georgia', serif;
    
    /* Spacing */
    --spacing-xs: 4px;
    --spacing-sm: 8px;
    --spacing-md: 16px;
    --spacing-lg: 24px;
    --spacing-xl: 32px;

    /* Border Radius */
    --radius-sm: 4px;
    --radius-md: 8px;
    --radius-lg: 12px;

    /* Transitions */
    --transition-fast: 0.2s ease;
    --transition-medium: 0.3s ease;

    /* Layout Parameters (Control everything from here) */
    --container-max-width: 1100px;
    --page-top-margin: 60px;
}

/* Light Theme Variables */
[data-theme='light'] {
    --primary-color: #003366; /* Navy */
    --secondary-color: #0055a4; /* Lighter Navy */
    --background-color: #ffffff;
    --text-color: #1a1a1a;
    --text-muted: #666;
    --white: #ffffff;
    --shadow-color: rgba(0, 0, 0, 0.08);
    --border-color: #eaeaea;
    --header-bg: #0a0a0a;
    --header-text: #ffffff;
    --card-bg: #ffffff;
    --inline-code-bg: #f5f5f5;
    --badge-color: #000000;
    --badge-bg: #f0f0f0;
    --code-block-bg: #1a1a1a;
    --code-block-text: #f8f8f2;
}

body {
    font-family: var(--font-main);
    color: var(--text-color);
    background-color: var(--background-color);
    line-height: 1.6;
    margin: 0;
    padding: 0;
    transition: background-color var(--transition-medium), color var(--transition-medium);
}

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

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

/* Common Card Styling (can be extended) */
.card {
    background: var(--white);
    border-radius: var(--radius-md);
    box-shadow: 0 4px 6px var(--shadow-color);
    padding: var(--spacing-md);
    margin-bottom: var(--spacing-md);
    transition: transform var(--transition-fast), box-shadow var(--transition-fast);
}

.card:hover {
    transform: translateY(-2px);
    box-shadow: 0 6px 12px var(--shadow-color);
}

/* Scroll to top button */
#scroll-to-top {
    position: fixed;
    bottom: 30px;
    right: 30px;
    width: 45px;
    height: 45px;
    border-radius: 50%;
    background: var(--primary-color);
    color: white;
    border: none;
    cursor: pointer;
    display: flex;
    align-items: center;
    justify-content: center;
    box-shadow: 0 4px 12px var(--shadow-color);
    opacity: 0;
    visibility: hidden;
    transition: all 0.3s ease;
    z-index: 1000;
}

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

#scroll-to-top:hover {
    transform: translateY(-5px);
    background: var(--secondary-color);
}