:root {
    /* Dark Mode (True Charcoal / Matte) */
    --bg-main: #121212;
    --text-main: #E0E0E0;

    --zinc-800: #242424;
    /* Cards */
    --zinc-900: #181818;
    /* Secondary BG */
    --zinc-700: #333333;
    /* Borders */
    --zinc-600: #424242;
    /* Accents */

    --violet-400: #8B5CF6;
    /* Softer Violet */
    --violet-500: #7C3AED;

    --rose-400: #FB7185;
    --rose-500: #E11D48;

    --text-heading: #F5F5F5;
    --text-muted: #9E9E9E;
    --text-muted-light: #BDBDBD;
    --text-muted-dark: #757575;

    --glass-bg: rgba(36, 36, 36, 0.85);
    --glass-border: rgba(255, 255, 255, 0.05);
    --glass-border-hover: rgba(139, 92, 246, 0.3);

    --pcb-opacity: 0.15;
    --pcb-blend: screen;
}

[data-theme="light"] {
    --bg-main: #FFFFFF;
    --text-main: #171717;

    --zinc-900: #F9FAFB;
    --zinc-800: #FFFFFF;
    --zinc-700: #E5E7EB;
    --zinc-600: #D1D5DB;

    --violet-400: #4F46E5;
    --violet-500: #4338CA;

    --rose-400: #E11D48;
    --rose-500: #BE123C;

    --text-heading: #000000;
    --text-muted: #4B5563;
    /* Readable dark gray for light mode */
    --text-muted-light: #374151;
    /* Very readable */
    --text-muted-dark: #6B7280;

    --glass-bg: rgba(255, 255, 255, 0.9);
    --glass-border: rgba(0, 0, 0, 0.08);
    --glass-border-hover: rgba(79, 70, 229, 0.4);

    --pcb-opacity: 0.06;
    --pcb-blend: multiply;
}

[data-theme="sepia"] {
    --bg-main: #FDF6E3;
    /* Solarized Light BG */
    --text-main: #657B83;
    /* Solarized Dark Text */

    --zinc-900: #EEE8D5;
    --zinc-800: #FDF6E3;
    --zinc-700: #D3C6A6;
    --zinc-600: #93A1A1;

    --violet-400: #268BD2;
    /* Solarized Blue */
    --violet-500: #2AA198;
    /* Solarized Cyan */

    --rose-400: #CB4B16;
    --rose-500: #DC322F;

    --text-heading: #073642;
    --text-muted: #586E75;
    --text-muted-light: #586E75;
    --text-muted-dark: #93A1A1;

    --glass-bg: rgba(253, 246, 227, 0.9);
    --glass-border: rgba(7, 54, 66, 0.1);
    --glass-border-hover: rgba(38, 139, 210, 0.4);

    --pcb-opacity: 0.06;
    --pcb-blend: luminosity;
}

body {
    background-color: var(--bg-main);
    color: var(--text-main);
    overflow-x: hidden;
    transition: background-color 0.3s ease, color 0.3s ease;
}

body::before {
    content: '';
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    width: 100vw;
    height: 100vh;
    z-index: -1;
    pointer-events: none;
    background-image: url('pcb-image.png');
    background-size: cover;
    background-position: center;
    background-repeat: no-repeat;
    opacity: var(--pcb-opacity);
    mix-blend-mode: var(--pcb-blend);
    transition: opacity 0.3s ease;
}

.text-heading {
    color: var(--text-heading) !important;
}

.text-muted {
    color: var(--text-muted) !important;
}

.text-muted-light {
    color: var(--text-muted-light) !important;
}

.glass-card {
    background: var(--glass-bg);
    backdrop-filter: blur(12px);
    -webkit-backdrop-filter: blur(12px);
    border: 1px solid var(--glass-border);
    transition: transform 0.3s ease, border-color 0.3s ease, background 0.3s ease;
}

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

.text-gradient {
    background: linear-gradient(to right, var(--violet-400), var(--violet-500));
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
}

.glow-button {
    box-shadow: 0 0 20px var(--glass-border-hover);
    transition: box-shadow 0.3s ease, transform 0.2s ease;
}

.glow-button:hover {
    box-shadow: 0 0 30px var(--violet-400);
    transform: scale(1.02);
}



/* Accessibility Widget Styles */
#a11y-widget {
    position: fixed;
    bottom: 20px;
    left: 20px;
    z-index: 9999;
    display: flex;
    flex-direction: column-reverse;
    gap: 10px;
}

#a11y-toggle {
    width: 48px;
    height: 48px;
    border-radius: 50%;
    background: var(--violet-500);
    color: white;
    border: none;
    cursor: pointer;
    box-shadow: 0 4px 12px rgba(0, 0, 0, 0.2);
    display: flex;
    align-items: center;
    justify-content: center;
    transition: transform 0.2s ease;
}

#a11y-toggle:hover {
    transform: scale(1.1);
}

#a11y-panel {
    display: none;
    background: var(--zinc-800);
    border: 1px solid var(--zinc-700);
    padding: 16px;
    border-radius: 12px;
    box-shadow: 0 10px 25px rgba(0, 0, 0, 0.2);
    width: 200px;
    flex-direction: column;
    gap: 12px;
}

#a11y-panel.open {
    display: flex;
}

.a11y-btn-group {
    display: flex;
    gap: 8px;
}

.a11y-btn {
    flex: 1;
    padding: 8px;
    border: 1px solid var(--zinc-700);
    background: var(--zinc-900);
    color: var(--text-heading);
    border-radius: 6px;
    cursor: pointer;
    font-size: 14px;
    font-weight: 600;
}

.a11y-btn:hover {
    border-color: var(--violet-400);
}