/* ====================================
   Base Styles & CSS Variables
   ==================================== */

html {
    scroll-behavior: smooth;
}

:root {
    /* Warmer Palette */
    --primary-color: #2E7D32;
    /* Warm Forest Green */
    --primary-hover: #1B5E20;
    --text-color: #3E3C38;
    /* Warm Charcoal */
    --text-secondary: #6B6960;
    /* Warm Grey */
    --bg-color: #FDFCF8;
    /* Warm Ivory */
    --section-bg: rgba(242, 240, 235, 0.8);
    /* Warm Beige slightly more opaque */
    --card-bg: #FFFFFF;
    --border-color: rgba(60, 60, 50, 0.12);
    --nav-bg: rgba(253, 252, 248, 0.8);

    /* Layout */
    --max-width: 1080px;
    --radius: 8px;
    --transition: 0.4s cubic-bezier(0.4, 0, 0.2, 1);
    --smooth-transition: 0.4s cubic-bezier(0.4, 0, 0.2, 1);
    --hover-transform: translateY(-8px) scale(1.03) translateZ(0);
}

/* Dark Mode Variables */
body.dark-theme,
[data-theme="dark"] {
    --text-color: #EAE8E3;
    /* Warm White */
    --text-secondary: #A8A6A0;
    --bg-color: #1C1C1A;
    /* Warm Black */
    --section-bg: rgba(30, 30, 28, 0.8);
    --card-bg: #252523;
    --border-color: rgba(234, 232, 227, 0.1);
    --nav-bg: rgba(28, 28, 26, 0.8);
    --primary-color: #4ade80;
    /* Brighter green for dark mode */
}

* {
    box-sizing: border-box;
    margin: 0;
    padding: 0;
}

body {
    font-family: 'Inter', -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
    background-color: var(--bg-color);
    color: var(--text-color);
    line-height: 1.6;
    -webkit-font-smoothing: antialiased;
}

/* Math Background Canvas */
#math-background {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    z-index: -1;
    pointer-events: none;
    opacity: 1;
}

/* Theme Toggle */
#theme-toggle {
    background: none;
    border: none;
    cursor: pointer;
    font-size: 1.2rem;
    padding: 8px;
    border-radius: 50%;
    transition: background 0.2s;
}

#theme-toggle:hover {
    background: var(--section-bg);
}

/* SVG Icons Styles */
.icon {
    width: 20px;
    height: 20px;
    stroke: currentColor;
    stroke-width: 2;
    stroke-linecap: round;
    stroke-linejoin: round;
    fill: none;
    vertical-align: middle;
}

/* ====================================
   Custom Scrollbar Styling
   ==================================== */

/* Webkit browsers (Chrome, Safari, Edge) */
::-webkit-scrollbar {
    width: 10px;
    height: 10px;
}

::-webkit-scrollbar-track {
    background: var(--bg-color);
    border-radius: 8px;
}

::-webkit-scrollbar-thumb {
    background: linear-gradient(180deg, #4ade80, var(--primary-color));
    border-radius: 8px;
    border: 2px solid var(--bg-color);
    transition: background 0.3s ease;
}

::-webkit-scrollbar-thumb:hover {
    background: linear-gradient(180deg, var(--primary-color), #1B5E20);
}

::-webkit-scrollbar-corner {
    background: var(--bg-color);
}

/* Firefox */
* {
    scrollbar-width: thin;
    scrollbar-color: var(--primary-color) var(--bg-color);
}