/* Shared Fluency palette for the study app and companion modes. */
        :root {
            /* Dark industrial base palette */
            --bg-primary: #0a0e14;
            --bg-secondary: #121820;
            --bg-tertiary: #1a222d;
            --bg-card: #1e2732;
            --bg-card-hover: #252f3c;

            /* Text colors - high contrast */
            --text-primary: #ffffff;
            --text-secondary: #e0e4ea;
            --text-muted: #c5ccd6;
            --text-subtle: #c5ccd6;

            /* Accent colors - industrial/energy */
            --accent-orange: #ff6b35;
            --accent-amber: #f5a623;
            --accent-blue: #4a9eff;
            --accent-green: #00d4aa;
            /* Phrase/clitic chain identity — deliberately not a language accent
               (those change per language) and not a result colour. */
            --accent-phrases: #a78bfa;
            --accent-phrases-rgb: 167, 139, 250;

            /* Language-specific theme colors (dynamically updated) */
            --accent-primary: #C8102E;
            --accent-secondary: #FFCC00;
            --accent-primary-text: #ffffff;
            --accent-secondary-text: #1a1a2e;

            /* Semantic colors */
            --success: #00d4aa;
            --error: #ff5252;
            --warning: #f5a623;

            /* Borders and dividers */
            --border-color: #2a3441;
            --border-light: #3a4553;

            /* Glow effects */
            --glow-orange: rgba(255, 107, 53, 0.3);
            --glow-blue: rgba(74, 158, 255, 0.3);
            --glow-green: rgba(0, 212, 170, 0.3);

            /* Fonts */
            --font-reading: 'DM Sans', -apple-system, BlinkMacSystemFont, sans-serif;
            --font-emphasis: 'Space Grotesk', -apple-system, BlinkMacSystemFont, sans-serif;
            --font-data: 'JetBrains Mono', monospace;
        }

:root[data-theme="light"] {
    color-scheme: light;

    /* Cool daylight neutrals keep the industrial Fluency grammar crisp. */
    --bg-primary: #eef2f5;
    --bg-secondary: #f6f8fa;
    --bg-tertiary: #e6ebef;
    --bg-card: #ffffff;
    --bg-card-hover: #f1f5f8;

    --text-primary: #17212b;
    --text-secondary: #354353;
    --text-muted: #5d6b7a;

    --accent-orange: #c84f24;
    --accent-amber: #946000;
    --accent-blue: #1769aa;
    --accent-green: #087f68;
    --accent-phrases: #7453c6;
    --accent-phrases-rgb: 116, 83, 198;

    --success: #087f68;
    --error: #bd3847;
    --warning: #946000;

    --border-color: #d7dfe6;
    --border-light: #c1ccd6;

    --glow-orange: rgba(200, 79, 36, 0.18);
    --glow-blue: rgba(23, 105, 170, 0.17);
    --glow-green: rgba(8, 127, 104, 0.17);
}