:root {
    --font-inter: 'Inter', system-ui, sans-serif;
    --font-system: system-ui, -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
    --font-verdana: Verdana, Geneva, sans-serif;
    --font-georgia: Georgia, 'Times New Roman', serif;
    --font-times: 'Times New Roman', Times, serif;
    --font-courier: 'Courier New', Courier, monospace;
    --pending: #e67e22;
    --svg-size: 20px;
    --border-radius: 8px;
    --app-font-family: var(--font-inter);
    --modal-overlay-backdrop-filter: blur(8px) saturate(1.2);
    --modal-border-radius: 16px;
    /* Dialogs are shared by chat, admin, authentication, and setup pages. */
    --modal-backdrop: rgba(24, 24, 27, 0.42);
    --modal-background: #ffffff;
    --modal-surface: #f7f7f8;
    --modal-border: #e4e4e7;
    --modal-border-strong: #a1a1aa;
    --modal-divider: #ececef;
    --modal-shadow: 0 24px 70px rgba(0, 0, 0, 0.18), 0 2px 12px rgba(0, 0, 0, 0.08);
    --modal-focus-ring: rgba(24, 24, 27, 0.14);
    --modal-primary-background: #18181b;
    --modal-primary-text: #ffffff;
    --modal-primary-hover: #27272a;
    --modal-secondary-background: #f4f4f5;
    --modal-secondary-text: #3f3f46;
    --modal-secondary-hover: #e4e4e7;
}

[data-mode="light"] {
    --text-color: #333333;
    --text-color-secondary: #787774;
    --text-color-tertiary: #9b9a97;
    --background: #ffffff;
    --border-color: #e9e9e7; /* rgb(0,0,0,0,0.05) */
    --scrollbar-thumb: #8A8986;
    /*
     * Application controls always use the monochrome palette. The selected
     * message color is defined separately below and cannot recolor the UI.
     */
    --primary-color: #333333;
    --primary-light: rgba(58, 58, 60, 0.1);
    --primary-hover: #555555;
    --accent-color: #111111;
    --shadow-color: rgba(0, 0, 0, 0.05);
    --error-color: #e74c3c;
    --error-background: rgba(239, 68, 68, 0.1);
    --error-border: rgba(239, 68, 68, 0.3);
    --error-hover-bg: rgb(104, 30, 12);
    --danger-hover-bg: rgb(251, 241, 240);
    --success-color: #2ecc71;
    --success-background: rgba(34, 197, 94, 0.1);
    --success-contrast-text: #102a1a;

    --hover: rgba(0, 0, 0, 0.05);
    --warning-color: #f59e0b;
    --warning-background: rgba(245, 158, 11, 0.1);
    --warning-border: rgba(245, 158, 11, 0.3);
    --input-bg: #F5F5F5;
    --surface-elevated: #ffffff;
    --surface-elevated-border: #dedee2;
    --surface-muted: #f4f4f5;
    --surface-interactive-hover: #ebebed;
    --surface-interactive-active: #e4e4e7;
    --surface-control: #f5f5f5;
    --surface-control-button: #ffffff;
    --surface-control-border: #e4e4e7;
    --surface-elevated-shadow: 0 18px 48px rgba(0, 0, 0, 0.14), 0 2px 10px rgba(0, 0, 0, 0.06);
    /* Soft Greige composer palette. Keep these tokens scoped to chat input
     * surfaces so the warmer treatment does not recolor the whole app. */
    --chat-composer-background: #EFEDE8;
    --chat-composer-border: #DCD9D2;
    --chat-composer-control: #E5E2DC;
    --chat-composer-control-hover: #DAD6CE;
    --chat-composer-placeholder: #6F6B64;
    --chat-composer-primary-control-background: #000000;
    --chat-composer-primary-control-hover: #202020;
    --chat-composer-primary-control-text: #FFFFFF;
    --chat-composer-shadow: 0 8px 24px rgba(54, 50, 43, 0.07), 0 1px 3px rgba(54, 50, 43, 0.04);
}

[data-mode="dark"] {
    --text-color: #F4F4F5;
    --text-color-secondary: #B4B4BA;
    --text-color-tertiary: #929299;
    --background: #1F1F1F;
    --scrollbar-thumb: #929299;


    --primary-color: #88888E;
    --primary-light: rgba(164, 164, 170, 0.16);
    --primary-hover: #A4A4AA;
    --accent-color: #68686E;
    --shadow-color: rgba(0, 0, 0, 0.45);
    --error-color: #F28B82;
    --error-background: rgba(248, 113, 113, 0.15);
    --error-border: rgba(248, 113, 113, 0.4);
    /* Filled danger buttons need a distinct hover state and strong white-text contrast. */
    --error-hover-bg: #B8443B;
    --danger-hover-bg: rgba(206, 64, 53, 0.15);
    --success-color: #81C995;
    --success-background: rgba(74, 222, 128, 0.15);
    --success-contrast-text: #102a1a;
    --border-color: #3F3F46;
    --hover: rgba(255, 255, 255, 0.09);
    --hover-bg: rgba(255, 255, 255, 0.09);
    --warning-color: #fbbf24;
    --warning-background: rgba(251, 191, 36, 0.15);
    --warning-border: rgba(251, 191, 36, 0.4);
    /* Inputs stay neutral and consistent across every accent palette. */
    --input-bg: #29292C;
    /*
     * Layer dark surfaces with visible neutral steps. The stronger hover token
     * remains theme-neutral and works for every accent color on index.html.
     */
    --surface-elevated: #242428;
    --surface-elevated-border: #45454d;
    --surface-muted: #2d2d32;
    --surface-interactive-hover: #39393f;
    --surface-interactive-active: #424249;
    --surface-control: #29292e;
    --surface-control-button: #202023;
    --surface-control-border: #3d3d44;
    --surface-elevated-shadow: 0 20px 52px rgba(0, 0, 0, 0.56), 0 1px 0 rgba(255, 255, 255, 0.04) inset;
    /* Dark companion values preserve the same warm-neutral Soft Greige hue
     * while maintaining visible separation between composer layers. */
    --chat-composer-background: #2D2C29;
    --chat-composer-border: #494743;
    --chat-composer-control: #393733;
    --chat-composer-control-hover: #44413C;
    --chat-composer-placeholder: #AAA7A0;
    --chat-composer-primary-control-background: #FFFFFF;
    --chat-composer-primary-control-hover: #E7E7E7;
    --chat-composer-primary-control-text: #000000;
    --chat-composer-shadow: 0 10px 28px rgba(0, 0, 0, 0.24), 0 1px 0 rgba(255, 255, 255, 0.025) inset;
    --modal-backdrop: rgba(5, 5, 7, 0.7);
    --modal-background: #202023;
    --modal-surface: #29292e;
    --modal-border: #414148;
    --modal-border-strong: #71717a;
    --modal-divider: #35353b;
    --modal-shadow: 0 28px 80px rgba(0, 0, 0, 0.58), 0 0 0 1px rgba(255, 255, 255, 0.025);
    --modal-focus-ring: rgba(244, 244, 245, 0.16);
    --modal-primary-background: #f4f4f5;
    --modal-primary-text: #18181b;
    --modal-primary-hover: #ffffff;
    --modal-secondary-background: #2a2a2f;
    --modal-secondary-text: #d4d4d8;
    --modal-secondary-hover: #33333a;
}

* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
    font-family: var(--app-font-family, var(--font-inter));
}

html {
    background: var(--background, #ffffff);
    height: 100%;
    color: var(--text-color, #333333);
}

body {
    height: 100%;
    background: var(--background, #ffffff);
    color: var(--text-color, #333333);
}

/* Text Selection - ensures copied text has standard colors for pasting */
::selection {
    background-color: rgba(59, 130, 246, 0.35);
    color: #000000;
}

::-moz-selection {
    background-color: rgba(59, 130, 246, 0.35);
    color: #000000;
}

[data-mode="dark"] ::selection {
    background-color: rgba(96, 165, 250, 0.4);
    color: #ffffff;
}

[data-mode="dark"] ::-moz-selection {
    background-color: rgba(96, 165, 250, 0.4);
    color: #ffffff;
}

/* Button Reset */
button {
    border: none;
    background: none;
    padding: 0;
    margin: 0;
    cursor: pointer;
    font-size: inherit;
}
/* Link (a) Reset */
a {
    text-decoration: none;
    color: inherit;
}
textarea {
    border: none;
    background: none;
    padding: 0;
    margin: 0;
    font-size: inherit;
    font-family: inherit;
    width: 100%;
    height: auto;
    resize: none; /* prevent manual resizing */
}

/* Keep a visible focus indicator for keyboard users on every textarea. */
textarea:focus-visible {
    outline: 2px solid var(--primary-color);
    outline-offset: 2px;
}

.cursor-pointer {
    cursor: pointer;
}

/* Accessibility - Screen reader only text */
.sr-only {
    position: absolute;
    width: 1px;
    height: 1px;
    padding: 0;
    margin: -1px;
    overflow: hidden;
    clip: rect(0, 0, 0, 0);
    white-space: nowrap;
    border-width: 0;
}

/* During theme switching, disable transitions to avoid delayed text updates without restarting animations */
.theme-switching,
.theme-switching * {
    transition-property: none !important;
    transition-duration: 0s !important;
    transition-delay: 0s !important;
}


@media (prefers-reduced-motion: reduce) {
    *,
    *::before,
    *::after {
        animation: none !important;
        transition: none !important;
        scroll-behavior: auto !important;
    }
}