/**
 * Chat Interface Styles
 * Includes: Modern Light, Modern Dark, Retro BBS, AS/400, DOS Works themes
 */

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

:root {
    --font-main: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, Oxygen, Ubuntu, sans-serif;
    --font-mono: 'Consolas', 'Monaco', 'Courier New', monospace;
    --transition-speed: 0.2s;
}

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

html, body {
    height: 100%;
    overflow: hidden;
}

body {
    font-family: var(--font-main);
    background: var(--bg-primary);
    color: var(--text-primary);
    transition: background var(--transition-speed), color var(--transition-speed);
}

/* ============================================
   THEME: Modern Light
   ============================================ */

[data-theme="modern-light"] {
    --bg-primary: #f5f7fa;
    --bg-secondary: #ffffff;
    --bg-tertiary: #e8ecf1;
    --text-primary: #1a1a2e;
    --text-secondary: #5a5a7a;
    --text-muted: #8a8aa0;
    --accent-color: #4f46e5;
    --accent-hover: #4338ca;
    --user-bubble: #4f46e5;
    --user-text: #ffffff;
    --assistant-bubble: #ffffff;
    --assistant-text: #1a1a2e;
    --border-color: #e2e8f0;
    --shadow-color: rgba(0, 0, 0, 0.08);
    --input-bg: #ffffff;
    --code-bg: #f1f5f9;
    --code-border: #e2e8f0;
    --scrollbar-thumb: #c1c1c1;
    --scrollbar-track: #f1f1f1;
}

/* ============================================
   THEME: Modern Dark
   ============================================ */

[data-theme="modern-dark"] {
    --bg-primary: #0f0f1a;
    --bg-secondary: #1a1a2e;
    --bg-tertiary: #252542;
    --text-primary: #e8e8f0;
    --text-secondary: #a8a8c0;
    --text-muted: #6a6a8a;
    --accent-color: #6366f1;
    --accent-hover: #818cf8;
    --user-bubble: #6366f1;
    --user-text: #ffffff;
    --assistant-bubble: #252542;
    --assistant-text: #e8e8f0;
    --border-color: #2a2a4a;
    --shadow-color: rgba(0, 0, 0, 0.3);
    --input-bg: #1a1a2e;
    --code-bg: #0d0d15;
    --code-border: #2a2a4a;
    --scrollbar-thumb: #3a3a5a;
    --scrollbar-track: #1a1a2e;
}

/* ============================================
   THEME: Retro BBS
   ============================================ */

[data-theme="retro-bbs"] {
    --font-main: 'Consolas', 'Monaco', 'Courier New', monospace;
    --bg-primary: #000010;
    --bg-secondary: #000020;
    --bg-tertiary: #000030;
    --text-primary: #00ff00;
    --text-secondary: #00cc00;
    --text-muted: #008800;
    --accent-color: #222222;
    --accent-hover: #ffff88;
    --user-bubble: #000040;
    --user-text: #00ffff;
    --assistant-bubble: #002000;
    --assistant-text: #00ff00;
    --border-color: #004400;
    --shadow-color: rgba(0, 255, 0, 0.1);
    --input-bg: #001000;
    --code-bg: #001a00;
    --code-border: #004400;
    --scrollbar-thumb: #00aa00;
    --scrollbar-track: #001100;
}

[data-theme="retro-bbs"] body {
    text-shadow: 0 0 5px rgba(0, 255, 0, 0.5);
}

[data-theme="retro-bbs"] .chat-header {
    border-bottom: 2px double var(--text-primary);
}

[data-theme="retro-bbs"] .logo::before {
    content: "═══ ";
}

[data-theme="retro-bbs"] .logo::after {
    content: " ═══";
}

[data-theme="retro-bbs"] .message {
    border: 1px solid var(--border-color);
}

[data-theme="retro-bbs"] .welcome-message {
    border: 2px double var(--text-primary);
}

[data-theme="retro-bbs"] .send-btn {
    border: 2px solid var(--accent-color);
}

/* ============================================
   THEME: IBM AS/400 (Green Screen)
   ============================================ */

[data-theme="as400"] {
    --font-main: 'Consolas', 'Lucida Console', 'Courier New', monospace;
    --bg-primary: #000000;
    --bg-secondary: #0a0a0a;
    --bg-tertiary: #141414;
    --text-primary: #33ff33;
    --text-secondary: #22cc22;
    --text-muted: #118811;
    --accent-color: #33ff33;
    --accent-hover: #66ff66;
    --user-bubble: #002200;
    --user-text: #33ff33;
    --assistant-bubble: #001100;
    --assistant-text: #33ff33;
    --border-color: #225522;
    --shadow-color: transparent;
    --input-bg: #001100;
    --code-bg: #001a00;
    --code-border: #225522;
    --scrollbar-thumb: #33aa33;
    --scrollbar-track: #0a0a0a;
}

[data-theme="as400"] body {
    text-shadow: 0 0 2px rgba(51, 255, 51, 0.8);
    letter-spacing: 1px;
}

[data-theme="as400"] .chat-container {
    border: 3px solid var(--text-primary);
}

[data-theme="as400"] .chat-header {
    background: var(--text-primary);
    color: #000000;
    text-shadow: none;
}

[data-theme="as400"] .chat-header .logo,
[data-theme="as400"] .chat-header .session-id {
    color: #000000;
}

[data-theme="as400"] .control-select {
    background: #000000;
    color: var(--text-primary);
    border: 1px solid var(--text-primary);
}

[data-theme="as400"] .icon-btn {
    background: #000000;
    color: var(--text-primary);
    border: 1px solid var(--text-primary);
}

[data-theme="as400"] .message-content {
    border: 1px solid var(--border-color);
}

[data-theme="as400"] .chat-input-area {
    border-top: 2px solid var(--text-primary);
}

[data-theme="as400"] .message-input {
    border: 2px solid var(--text-primary);
}

[data-theme="as400"] .send-btn {
    background: var(--text-primary);
    color: #000000;
    text-shadow: none;
}

[data-theme="as400"]::before {
    content: "";
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: repeating-linear-gradient(
        0deg,
        rgba(0, 0, 0, 0.1),
        rgba(0, 0, 0, 0.1) 1px,
        transparent 1px,
        transparent 2px
    );
    pointer-events: none;
    z-index: 9999;
}

/* ============================================
   THEME: DOS Microsoft Works
   ============================================ */

[data-theme="dos-works"] {
    --font-main: 'Consolas', 'Fixedsys', 'Courier New', monospace;
    --bg-primary: #0000aa;
    --bg-secondary: #0000cc;
    --bg-tertiary: #000088;
    --text-primary: #ffffff;
    --text-secondary: #ffff55;
    --text-muted: #aaaaaa;
    --accent-color: #55ffff;
    --accent-hover: #ffffff;
    --user-bubble: #008888;
    --user-text: #ffffff;
    --assistant-bubble: #000088;
    --assistant-text: #ffff55;
    --border-color: #5555ff;
    --shadow-color: transparent;
    --input-bg: #000066;
    --code-bg: #000044;
    --code-border: #5555ff;
    --scrollbar-thumb: #5555ff;
    --scrollbar-track: #000044;
}

[data-theme="dos-works"] .chat-container {
    border: 3px double #ffffff;
}

[data-theme="dos-works"] .chat-header {
    background: #00aaaa;
    color: #000000;
    border-bottom: 2px solid #ffffff;
}

[data-theme="dos-works"] .chat-header .logo,
[data-theme="dos-works"] .chat-header .session-id {
    color: #000000;
}

[data-theme="dos-works"] .control-select,
[data-theme="dos-works"] .icon-btn {
    background: #000088;
    color: #ffffff;
    border: 2px outset #aaaaaa;
}

[data-theme="dos-works"] .control-select:hover,
[data-theme="dos-works"] .icon-btn:hover {
    background: #0000cc;
}

[data-theme="dos-works"] .menu-dropdown {
    border: 2px outset #aaaaaa;
    background: #c0c0c0;
    color: #000000;
}

[data-theme="dos-works"] .menu-item {
    color: #000000;
}

[data-theme="dos-works"] .menu-item:hover {
    background: #000088;
    color: #ffffff;
}

[data-theme="dos-works"] .message-content {
    border: 2px inset #5555ff;
}

[data-theme="dos-works"] .user-message .message-content {
    background: var(--user-bubble);
    border: 2px outset #00cccc;
}

[data-theme="dos-works"] .assistant-message .message-content {
    background: var(--assistant-bubble);
    border: 2px inset #5555ff;
}

[data-theme="dos-works"] .message-input {
    border: 2px inset #5555ff;
    background: #000044;
    color: #ffffff;
}

[data-theme="dos-works"] .send-btn {
    border: 2px outset #aaaaaa;
    background: #c0c0c0;
    color: #000000;
}

[data-theme="dos-works"] .send-btn:hover {
    background: #d0d0d0;
}

[data-theme="dos-works"] .send-btn:active {
    border: 2px inset #aaaaaa;
}

[data-theme="dos-works"] .modal-content {
    border: 3px outset #aaaaaa;
    background: #c0c0c0;
    color: #000000;
}

[data-theme="dos-works"] .btn {
    border: 2px outset #aaaaaa;
    background: #c0c0c0;
    color: #000000;
}

[data-theme="dos-works"] .btn:active {
    border: 2px inset #aaaaaa;
}

[data-theme="dos-works"] .welcome-icon {
    color: var(--text-secondary);
}

/* ============================================
   THEME: CRT Phosphor
   ============================================ */

[data-theme="crt-phosphor"] {
    --font-main: 'VT323', 'Consolas', 'Courier New', monospace;
    --font-mono: 'VT323', 'Consolas', 'Courier New', monospace;
    --bg-primary: #000000;
    --bg-secondary: #020202;
    --bg-tertiary: #050505;
    --text-primary: #00FF41;
    --text-secondary: #66FF99;
    --text-muted: #006600;
    --accent-color: #00FF41;
    --accent-hover: #33FF66;
    --user-bubble: #001a00;
    --user-text: #00ff41;
    --assistant-bubble: #001100;
    --assistant-text: #00ff41;
    --border-color: #003300;
    --shadow-color: rgba(0, 255, 65, 0.06);
    --input-bg: #010101;
    --code-bg: #001100;
    --code-border: #003300;
    --scrollbar-thumb: #002200;
    --scrollbar-track: #000000;
}

[data-theme="crt-phosphor"] body {
    background: radial-gradient(circle at 50% 0%, rgba(0,255,65,0.02), transparent 20%), var(--bg-primary);
}

[data-theme="crt-phosphor"] .message {
    text-shadow: 0 0 6px rgba(0,255,65,0.18);
}

[data-theme="crt-phosphor"] .chat-header {
    border-bottom: 2px dashed #003300;
}

[data-theme="crt-phosphor"]::before { /* scanlines */
    content: "";
    position: fixed;
    left: 0;
    top: 0;
    right: 0;
    bottom: 0;
    background-image: linear-gradient(rgba(0,0,0,0.02) 50%, rgba(255,255,255,0) 50%);
    background-size: 100% 3px;
    pointer-events: none;
    z-index: 9999;
}

/* ============================================
   THEME: Amber Mainframe
   ============================================ */

[data-theme="amber-mainframe"] {
    --font-main: 'Consolas', 'Lucida Console', 'Courier New', monospace;
    --bg-primary: #050400;
    --bg-secondary: #0a0a05;
    --bg-tertiary: #14120a;
    --text-primary: #FFBF00;
    --text-secondary: #FFD166;
    --text-muted: #AA8A00;
    --accent-color: #FFBF00;
    --accent-hover: #FFD166;
    --user-bubble: #1a1200;
    --user-text: #ffbf00;
    --assistant-bubble: #100a00;
    --assistant-text: #ffbf00;
    --border-color: #553600;
    --shadow-color: transparent;
    --input-bg: #0b0700;
    --code-bg: #0e0a04;
    --code-border: #553600;
    --scrollbar-thumb: #aa7a00;
    --scrollbar-track: #070601;
}

[data-theme="amber-mainframe"] body {
    color: var(--text-primary);
}

[data-theme="amber-mainframe"] .chat-header {
    background: linear-gradient(90deg, rgba(255,191,0,0.06), rgba(255,209,102,0.03));
    border-bottom: 1px solid var(--border-color);
}

/* ============================================
   THEME: Commodore 64
   ============================================ */

[data-theme="commodore64"] {
    --font-main: 'Press Start 2P', 'Courier New', monospace;
    --bg-primary: #0b0b1a;
    --bg-secondary: #101030;
    --bg-tertiary: #0b0b1a;
    --text-primary: #00A6FF;
    --text-secondary: #FF6B6B;
    --text-muted: #FCE77D;
    --accent-color: #00A6FF;
    --accent-hover: #0090e6;
    --user-bubble: #002244;
    --user-text: #00A6FF;
    --assistant-bubble: #000033;
    --assistant-text: #FCE77D;
    --border-color: #214060;
    --shadow-color: rgba(0,0,0,0.3);
    --input-bg: #000022;
    --code-bg: #001030;
    --code-border: #214060;
    --scrollbar-thumb: #214060;
    --scrollbar-track: #000020;
}

[data-theme="commodore64"] .chat-container {
    border: 4px solid #ffde00; /* faux decorative stripe */
}

[data-theme="commodore64"] .send-btn {
    border: 2px solid #00A6FF;
    background: linear-gradient(180deg, #001a33 0%, #000022 100%);
}

/* ============================================
   THEME: Amiga Workbench
   ============================================ */

[data-theme="amiga-workbench"] {
    --font-main: 'Segoe UI', 'Helvetica Neue', Arial, sans-serif;
    --bg-primary: #ede6c9;
    --bg-secondary: #cbe9e6;
    --bg-tertiary: #9cc7c6;
    --text-primary: #2e2b28;
    --text-secondary: #6b6b6b;
    --text-muted: #8b8b8b;
    --accent-color: #5c4e44;
    --accent-hover: #8b6f61;
    --user-bubble: #e7f4f3;
    --user-text: #2e2b28;
    --assistant-bubble: #d9e9e7;
    --assistant-text: #2e2b28;
    --border-color: #b0a08f;
    --shadow-color: rgba(0, 0, 0, 0.06);
    --input-bg: #e6f6f6;
    --code-bg: #f3f6f6;
    --code-border: #b0a08f;
    --scrollbar-thumb: #b0a08f;
    --scrollbar-track: #f3f3f3;
}

[data-theme="amiga-workbench"] .chat-container {
    border: 2px solid #b0a08f;
    border-radius: 6px;
}

[data-theme="amiga-workbench"] .chat-header {
    background: linear-gradient(180deg, rgba(92,78,68,0.06), rgba(92,78,68,0.02));
}

/* ============================================
   THEME: Arcade Neon
   ============================================ */

[data-theme="arcade-neon"] {
    --font-main: 'Orbitron', 'Audiowide', sans-serif;
    --bg-primary: #080008;
    --bg-secondary: #100020;
    --bg-tertiary: #150030;
    --text-primary: #E6E6FA;
    --text-secondary: #00D0FF;
    --text-muted: #A88AFF;
    --accent-color: #FF2D95;
    --accent-hover: #ff5aa6;
    --user-bubble: #160020;
    --user-text: #FF6BFF;
    --assistant-bubble: #0b0033;
    --assistant-text: #00D0FF;
    --border-color: #3b0b54;
    --shadow-color: rgba(255, 45, 149, 0.08);
    --input-bg: #1b0022;
    --code-bg: #14001b;
    --code-border: #3b0b54;
    --scrollbar-thumb: #2e0a5b;
    --scrollbar-track: #0e0011;
}

[data-theme="arcade-neon"] .chat-header {
    background: linear-gradient(90deg, rgba(255,45,149,0.06), rgba(0,208,255,0.05));
    box-shadow: 0 6px 20px rgba(0,0,0,0.6);
}

/* ============================================
   THEME: Windows 95
   ============================================ */

[data-theme="win95"] {
    --font-main: 'Tahoma', 'Segoe UI', 'Arial', sans-serif;
    --bg-primary: #c0c0c0;
    --bg-secondary: #e0e0e0;
    --bg-tertiary: #d0d0d0;
    --text-primary: #000000;
    --text-secondary: #333333;
    --text-muted: #666666;
    --accent-color: #0a66c2;
    --accent-hover: #1068d7;
    --user-bubble: #ffffff;
    --user-text: #000000;
    --assistant-bubble: #ffffff;
    --assistant-text: #000000;
    --border-color: #808080;
    --shadow-color: rgba(0, 0, 0, 0.06);
    --input-bg: #ffffff;
    --code-bg: #f7f7f7;
    --code-border: #808080;
    --scrollbar-thumb: #a0a0a0;
    --scrollbar-track: #e8e8e8;
}

[data-theme="win95"] .chat-container {
    border: 4px outset #c0c0c0;
}

[data-theme="win95"] .btn, [data-theme="win95"] .send-btn {
    border: 2px outset #808080;
    background: linear-gradient(180deg, #ffffff 0%, #e8e8e8 100%);
}

/* ============================================
   THEME: Mac OS 9 Aqua
   ============================================ */

[data-theme="macos9-aqua"] {
    --font-main: 'Geneva', 'Helvetica Neue', 'Arial', sans-serif;
    --bg-primary: #f0f8ff;
    --bg-secondary: #e6f4ff;
    --bg-tertiary: #cfeaff;
    --text-primary: #203040;
    --text-secondary: #406070;
    --text-muted: #7890a0;
    --accent-color: #00aaff;
    --accent-hover: #33c1ff;
    --user-bubble: #ffffff;
    --user-text: #203040;
    --assistant-bubble: #f8fbff;
    --assistant-text: #203040;
    --border-color: #b6d7ff;
    --shadow-color: rgba(0, 0, 0, 0.06);
    --input-bg: #ffffff;
    --code-bg: #f9fbff;
    --code-border: #d9eaff;
    --scrollbar-thumb: #b0d6ff;
    --scrollbar-track: #f5f9ff;
}

[data-theme="macos9-aqua"] .chat-header {
    background: linear-gradient(180deg, rgba(0,170,255,0.06), rgba(0,170,255,0.02));
    border-bottom: 1px solid var(--border-color);
}

/* ============================================
   THEME: BBS / ANSI (Enhanced)
   ============================================ */

[data-theme="bbs-ansi"] {
    --font-main: 'Terminus', 'Courier New', monospace;
    --bg-primary: #000000;
    --bg-secondary: #080808;
    --bg-tertiary: #101010;
    --text-primary: #ffffff;
    --text-secondary: #ffd700;
    --text-muted: #808080;
    --accent-color: #00aaff;
    --accent-hover: #66ccff;
    --user-bubble: #001133;
    --user-text: #66ccff;
    --assistant-bubble: #220022;
    --assistant-text: #ffd700;
    --border-color: #333333;
    --shadow-color: transparent;
    --input-bg: #0b0b0b;
    --code-bg: #020202;
    --code-border: #333333;
    --scrollbar-thumb: #444444;
    --scrollbar-track: #0b0b0b;
}

[data-theme="bbs-ansi"] .logo {
    font-weight: 700;
    letter-spacing: 2px;
}

/* Slightly lighter user avatar in BBS / ANSI theme */
[data-theme="bbs-ansi"] .user-message .message-avatar {
    /* A bit lighter than --bg-tertiary to help avatars pop on dark background */
    background: #1a1a1a;
    /* Thin border using a translucent version of --user-text to match theme */
    border: 1px solid rgba(102, 204, 255, 0.25);
}

/* Match assistant avatar styling (same background, thin border using --assistant-text) */
[data-theme="bbs-ansi"] .assistant-message .message-avatar {
    /* Keep background consistent with user avatar for balance */
    background: #1a1a1a;
    /* Thin border using a translucent version of assistant text color (#ffd700) */
    border: 1px solid rgba(255, 215, 0, 0.25);
    /* Use assistant text color for avatar foreground to help it pop */
    color: var(--assistant-text);
}

/* ============================================
   THEME: Synthwave 80s
   ============================================ */

[data-theme="synthwave"] {
    --font-main: 'Saira Stencil One', 'Orbitron', sans-serif;
    --bg-primary: #151033;
    --bg-secondary: linear-gradient(180deg,#211241 0%, #14102b 100%);
    --bg-tertiary: #1f1336;
    --text-primary: #ffe6f0;
    --text-secondary: #ff8fbf;
    --text-muted: #d1bfe6;
    --accent-color: #ff6b94;
    --accent-hover: #ff8fbf;
    --user-bubble: #27123a;
    --user-text: #ffb6c6;
    --assistant-bubble: #1d1730;
    --assistant-text: #e2b6ff;
    --border-color: #3d0549;
    --shadow-color: rgba(255, 107, 148, 0.08);
    --input-bg: #0f0830;
    --code-bg: #11061f;
    --code-border: #3d0549;
    --scrollbar-thumb: #5d0a46;
    --scrollbar-track: #10061b;
}

[data-theme="synthwave"] body {
    background-image: radial-gradient(ellipse at bottom center, rgba(255, 107, 148, 0.04), transparent 18%), repeating-linear-gradient(0deg, rgba(255,255,255,0.01) 0 1px, transparent 1px);
}

/* ============================================
   THEME: Vaporwave Pastel
   ============================================ */

[data-theme="vaporwave"] {
    --font-main: 'Quicksand', 'Saira', sans-serif;
    --bg-primary: linear-gradient(180deg, #ffd1dc 0%, #d7b6ff 100%);
    --bg-secondary: #fff8fb;
    --bg-tertiary: #f6edf9;
    --text-primary: #221122;
    --text-secondary: #6d2e8f;
    --text-muted: #bb99cc;
    --accent-color: #ff6b8c;
    --accent-hover: #ff99aa;
    --user-bubble: #ffeeff;
    --user-text: #221122;
    --assistant-bubble: #fff0ff;
    --assistant-text: #3a023a;
    --border-color: #f9d7f0;
    --shadow-color: rgba(0, 0, 0, 0.04);
    --input-bg: #fff6fb;
    --code-bg: #fff4fb;
    --code-border: #f0d8f1;
    --scrollbar-thumb: #e7cbe9;
    --scrollbar-track: #fff8fb;
}

/* ============================================
   Layout Components
   ============================================ */

.chat-container {
    display: flex;
    flex-direction: column;
    height: 100vh;
    width: 100%;
    background: var(--bg-secondary);
    box-shadow: none;
}

/* Header */
.chat-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 15px 20px;
    background: var(--bg-secondary);
    border-bottom: 1px solid var(--border-color);
    position: relative;
    z-index: 100;
}

.header-left {
    display: flex;
    align-items: center;
    gap: 15px;
}

.header-right {
    display: flex;
    align-items: center;
    gap: 10px;
}

.logo {
    font-size: 1.4rem;
    font-weight: 700;
    color: var(--text-primary);
}

.session-id {
    font-size: 0.8rem;
    color: var(--text-muted);
    background: var(--bg-tertiary);
    padding: 4px 10px;
    border-radius: 12px;
}

.control-select {
    background: var(--bg-tertiary);
    color: var(--text-primary);
    border: 1px solid var(--border-color);
    padding: 8px 12px;
    border-radius: 8px;
    font-size: 0.85rem;
    cursor: pointer;
    transition: all var(--transition-speed);
}

.control-select:hover {
    border-color: var(--accent-color);
}

.control-input {
    background: var(--bg-tertiary);
    color: var(--text-primary);
    border: 1px solid var(--border-color);
    padding: 8px 10px;
    border-radius: 8px;
    font-size: 0.9rem;
    width: 100%;
    box-sizing: border-box;
}

.sidebar-search {
    padding: 10px;
}

.empty.no-results {
    padding: 10px;
    text-align: center;
    color: var(--text-muted);
    display: none;
}

.icon-btn {
    background: var(--bg-tertiary);
    color: var(--text-primary);
    border: 1px solid var(--border-color);
    width: 40px;
    height: 40px;
    border-radius: 8px;
    font-size: 1.2rem;
    cursor: pointer;
    transition: all var(--transition-speed);
    display: flex;
    align-items: center;
    justify-content: center;
}

.icon-btn:hover {
    background: var(--accent-color);
    color: white;
    border-color: var(--accent-color);
}

/* Menu Dropdown */
.menu-dropdown {
    position: absolute;
    top: 65px;
    right: 20px;
    background: var(--bg-secondary);
    border: 1px solid var(--border-color);
    border-radius: 12px;
    box-shadow: 0 10px 40px var(--shadow-color);
    z-index: 200;
    min-width: 200px;
    overflow: hidden;
}

.menu-dropdown.hidden {
    display: none;
}

.menu-item {
    display: block;
    width: 100%;
    padding: 12px 16px;
    background: none;
    border: none;
    color: var(--text-primary);
    font-size: 0.9rem;
    text-align: left;
    cursor: pointer;
    transition: background var(--transition-speed);
}

.menu-item:hover {
    background: var(--bg-tertiary);
}

.menu-divider {
    border: none;
    border-top: 1px solid var(--border-color);
    margin: 5px 0;
}

/* Chat Messages */
.chat-messages {
    flex: 1;
    overflow-y: auto;
    /* prevent long children from causing horizontal page scroll */
    overflow-x: hidden;
    padding: 20px;
    display: flex;
    flex-direction: column;
    gap: 20px;
    background: var(--bg-primary);
} 

.chat-messages::-webkit-scrollbar {
    width: 8px;
}

.chat-messages::-webkit-scrollbar-track {
    background: var(--scrollbar-track);
}

.chat-messages::-webkit-scrollbar-thumb {
    background: var(--scrollbar-thumb);
    border-radius: 4px;
}

/* Welcome Message */
.welcome-message {
    text-align: center;
    padding: 60px 20px;
    color: var(--text-secondary);
}

.welcome-icon {
    font-size: 4rem;
    margin-bottom: 20px;
}

.welcome-message h2 {
    font-size: 1.8rem;
    margin-bottom: 10px;
    color: var(--text-primary);
}

.welcome-message p {
    font-size: 1rem;
    margin-bottom: 5px;
}

.welcome-hint {
    font-size: 0.85rem;
    color: var(--text-muted);
    margin-top: 15px;
}

/* Messages */
.message {
    display: flex;
    gap: 12px;
    max-width: 85%;
    animation: fadeIn 0.3s ease;
}

@keyframes fadeIn {
    from {
        opacity: 0;
        transform: translateY(10px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

.user-message {
    align-self: flex-end;
    flex-direction: row-reverse;
}

.assistant-message {
    align-self: flex-start;
}

.message-avatar {
    width: 40px;
    height: 40px;
    border-radius: 50%;
    background: var(--bg-tertiary);
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 1.2rem;
    flex-shrink: 0;
}

.message-content {
    background: var(--assistant-bubble);
    color: var(--assistant-text);
    /* Thin border that matches the message text color */
    border: 1px solid currentColor;
    padding: 14px 18px;
    border-radius: 18px;
    border-top-left-radius: 4px;
    box-shadow: 0 2px 8px var(--shadow-color);
}

/* Ensure code blocks inside message bubbles don't break layout */
.message-content pre,
.message-content code {
    max-width: 100%;
    box-sizing: border-box;
    overflow-x: auto;
    white-space: pre;
    overflow-wrap: anywhere;
}


.user-message .message-content {
    background: var(--user-bubble);
    color: var(--user-text);
    /* Thin border that matches the message text color */
    border: 1px solid currentColor;
    border-radius: 18px;
    border-top-right-radius: 4px;
}

.message-text {
    font-size: 0.95rem;
    line-height: 1.6;
    word-wrap: break-word;
}

.message-time {
    font-size: 0.7rem;
    color: var(--text-muted);
    margin-top: 6px;
    text-align: right;
}

.user-message .message-time {
    color: rgba(255, 255, 255, 0.7);
}

/* Typing Indicator */
.typing-indicator {
    display: flex;
    gap: 4px;
    padding: 8px 0;
}

.typing-indicator span {
    width: 8px;
    height: 8px;
    background: var(--text-muted);
    border-radius: 50%;
    animation: typing 1.4s infinite;
}

.typing-indicator span:nth-child(2) {
    animation-delay: 0.2s;
}

.typing-indicator span:nth-child(3) {
    animation-delay: 0.4s;
}

@keyframes typing {
    0%, 60%, 100% {
        transform: translateY(0);
        opacity: 0.4;
    }
    30% {
        transform: translateY(-8px);
        opacity: 1;
    }
}

/* Input Area */
.chat-input-area {
    padding: 15px 20px;
    background: var(--bg-secondary);
    border-top: 1px solid var(--border-color);
}

/* Content Viewer Layout */
.content-viewer {
    display: flex;
    gap: 12px;
    padding: 16px;
}
.viewer-sidebar {
    width: 220px; /* reduced width */
    max-height: calc(100vh - 140px);
    overflow-y: auto;
    border-right: 1px solid var(--border-color);
    padding-right: 8px;
}

/* Mobile behavior: replace left sidebar with a top dropdown */
.mobile-only { display: none; }
@media (max-width: 800px) {
    .viewer-sidebar { display: none; }
    .mobile-only { display: inline-block; margin-left: 8px; }
    .viewer-main { padding-left: 8px; }
} 
.content-item {
    padding: 8px;
    border-radius: 6px;
    cursor: pointer;
    margin-bottom: 8px;
}
.content-item[aria-selected="true"] {
    background: var(--bg-tertiary);
    border: 1px solid var(--accent-color);
}
.content-title { font-weight: 700; font-size: 0.95rem; }
.content-meta { font-size: 0.75rem; color: var(--text-muted); margin: 4px 0; }
.content-preview { color: var(--text-secondary); font-size: 0.85rem; max-height: 3.6em; overflow: hidden; }
.viewer-main { flex: 1; max-height: calc(100vh - 140px); overflow-y: auto; padding-left: 12px; }
.view-text { white-space: pre-wrap; line-height: 1.6; margin-top: 10px; padding: 15px; }
.view-images { display: flex; flex-wrap: wrap; gap: 12px; margin-top: 12px; }
.view-image img { max-width: 280px; border-radius: 8px; display: block; }
.empty { color: var(--text-muted); padding: 20px; text-align: center; }

.input-container {
    display: flex;
    gap: 12px;
    align-items: flex-end;
}

/* Suggest + Auto toggle wrapper (when auto mode enabled) */
.suggest-auto-wrapper {
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 10px; /* increase gap to separate suggest button and toggle */
    margin-top: 10px; /* more spacing so outline doesn't reach the suggest button */
}

/* Small toggle switch */
.auto-toggle {
    display: inline-block;
    margin-left: -8px; /* shift slightly left to avoid overlap */
}
.auto-toggle input {
    display: none;
}
.auto-toggle .auto-switch {
    width: 28px;
    height: 16px;
    /* stronger translucent plate for visibility on black backgrounds */
    background: rgba(255,255,255,0.08);
    border-radius: 999px;
    position: relative;
    border: 1px solid rgba(255,255,255,0.22);
    box-shadow: 0 0 0 1px rgba(255,255,255,0.03) inset;
    transition: background 0.12s ease, box-shadow 0.12s ease, transform 0.12s ease;
    outline: none;
}
/* outer outline/glow element for strong visibility (top inset increased to prevent overlap) */
.auto-toggle .auto-switch::before {
    content: '';
    position: absolute;
    /* top right bottom left: set a positive top inset to move outline downward */
    inset: 4px -4px -6px -4px;
    border-radius: 999px;
    pointer-events: none;
    box-shadow: 0 0 0 2px rgba(255,255,255,0.02);
    transition: box-shadow 0.12s ease, opacity 0.12s ease;
    opacity: 1;
}
.auto-toggle .auto-switch::after {
    content: '';
    position: absolute;
    top: 2px;
    left: 2px;
    width: 12px;
    height: 12px;
    /* light knob so it shows clearly on dark backgrounds */
    background: rgba(255,255,255,0.98);
    border-radius: 50%;
    transition: transform 0.12s ease, background 0.12s ease;
    box-shadow: 0 1px 3px rgba(0,0,0,0.45);
    border: 1px solid rgba(0,0,0,0.18);
}
.auto-toggle input:checked + .auto-switch {
    background: var(--accent-color);
    box-shadow: 0 0 0 4px rgba(255,255,255,0.03) inset, 0 0 10px rgba(0,0,0,0.12);
}
.auto-toggle input:checked + .auto-switch::after {
    transform: translateX(12px);
    background: #ffffff;
    box-shadow: 0 2px 6px rgba(0,0,0,0.5);
}
/* stronger outer outline when checked to make it obvious (limited spread) */
.auto-toggle input:checked + .auto-switch::before {
    box-shadow: 0 0 0 4px rgba(255,255,255,0.10);
}
/* Stronger outline on dark themes for extra contrast */
[data-theme="modern-dark"] .auto-toggle .auto-switch,
[data-theme="bbs-ansi"] .auto-toggle .auto-switch,
[data-theme="retro-bbs"] .auto-toggle .auto-switch,
[data-theme="crt-phosphor"] .auto-toggle .auto-switch {
    background: rgba(255,255,255,0.06);
    border: 1px solid rgba(255,255,255,0.28);
    box-shadow: 0 0 0 2px rgba(255,255,255,0.04) inset;
}
[data-theme="modern-dark"] .auto-toggle .auto-switch::after,
[data-theme="bbs-ansi"] .auto-toggle .auto-switch::after,
[data-theme="retro-bbs"] .auto-toggle .auto-switch::after,
[data-theme="crt-phosphor"] .auto-toggle .auto-switch::after {
    background: rgba(255,255,255,0.98);
    border: 1px solid rgba(0,0,0,0.2);
}
/* stronger outer outline on dark themes both on/off, limited spread */
[data-theme="modern-dark"] .auto-toggle .auto-switch::before,
[data-theme="bbs-ansi"] .auto-toggle .auto-switch::before,
[data-theme="retro-bbs"] .auto-toggle .auto-switch::before,
[data-theme="crt-phosphor"] .auto-toggle .auto-switch::before {
    box-shadow: 0 0 0 4px rgba(255,255,255,0.12);
}
/* provide a clear focus outline for accessibility */
.auto-toggle input:focus + .auto-switch {
    outline: 2px solid rgba(255,255,255,0.14);
    outline-offset: 2px;
} 

.message-input {
    flex: 1;
    background: var(--input-bg);
    border: 2px solid var(--border-color);
    border-radius: 24px;
    padding: 14px 20px;
    font-size: 0.95rem;
    color: var(--text-primary);
    resize: none;
    max-height: 150px;
    font-family: inherit;
    transition: border-color var(--transition-speed);
}

.message-input:focus {
    outline: none;
    border-color: var(--accent-color);
}

.message-input::placeholder {
    color: var(--text-muted);
}

.send-btn {
    width: 50px;
    height: 50px;
    border-radius: 50%;
    background: var(--accent-color);
    color: white;
    border: none;
    cursor: pointer;
    display: flex;
    align-items: center;
    justify-content: center;
    transition: all var(--transition-speed);
    flex-shrink: 0;
}

.send-btn:hover {
    background: var(--accent-hover);
    transform: scale(1.05);
}

.send-btn:disabled {
    opacity: 0.5;
    cursor: not-allowed;
    transform: none;
}

.send-icon {
    font-size: 1.3rem;
}

.input-hint {
    font-size: 0.75rem;
    color: var(--text-muted);
    text-align: center;
    margin-top: 8px;
}

/* Modal */
.modal {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: rgba(0, 0, 0, 0.6);
    display: flex;
    align-items: center;
    justify-content: center;
    z-index: 1000;
    backdrop-filter: blur(4px);
}

.modal.hidden {
    display: none;
}

.modal-content {
    background: var(--bg-secondary);
    padding: 30px;
    border-radius: 16px;
    max-width: 400px;
    width: 90%;
    box-shadow: 0 20px 60px rgba(0, 0, 0, 0.3);
}

.modal-content h3 {
    margin-bottom: 15px;
    color: var(--text-primary);
}

.modal-content p {
    color: var(--text-secondary);
    margin-bottom: 20px;
    font-size: 0.9rem;
}

.modal-input {
    width: 100%;
    padding: 12px 16px;
    border: 2px solid var(--border-color);
    border-radius: 8px;
    background: var(--input-bg);
    color: var(--text-primary);
    font-size: 0.95rem;
    margin-bottom: 20px;
}

.modal-input:focus {
    outline: none;
    border-color: var(--accent-color);
}

.modal-label {
    display: flex;
    align-items: center;
    gap: 10px;
    color: var(--text-secondary);
    font-size: 0.9rem;
    margin-bottom: 20px;
    cursor: pointer;
}

.modal-buttons {
    display: flex;
    gap: 10px;
    justify-content: flex-end;
}

.btn {
    padding: 10px 20px;
    border-radius: 8px;
    font-size: 0.9rem;
    cursor: pointer;
    transition: all var(--transition-speed);
    border: none;
}

.btn-primary {
    background: var(--accent-color);
    color: white;
}

.btn-primary:hover {
    background: var(--accent-hover);
}

.btn-secondary {
    background: var(--bg-tertiary);
    color: var(--text-primary);
}

.btn-secondary:hover {
    background: var(--border-color);
}

/* ============================================
   Markdown Styles
   ============================================ */

.markdown-content h1,
.markdown-content h2,
.markdown-content h3,
.markdown-content h4,
.markdown-content h5,
.markdown-content h6 {
    margin: 16px 0 8px 0;
    font-weight: 600;
    line-height: 1.3;
}

.markdown-content h1 { font-size: 1.3em; }
.markdown-content h2 { font-size: 1.2em; }
.markdown-content h3 { font-size: 1.15em; }
.markdown-content h4 { font-size: 1.05em; }

.markdown-content p {
    margin: 8px 0;
}

.markdown-content ul,
.markdown-content ol {
    margin: 8px 0;
    padding-left: 24px;
}

.markdown-content li {
    margin: 4px 0;
}

.markdown-content code {
    font-family: var(--font-mono);
    background: var(--code-bg);
    padding: 2px 6px;
    border-radius: 4px;
    font-size: 0.9em;
    border: 1px solid var(--code-border);
}

.markdown-content pre {
    background: var(--code-bg);
    border: 1px solid var(--code-border);
    border-radius: 8px;
    padding: 16px;
    overflow-x: auto;
    margin: 12px 0;

    /* Constrain width so long lines create an inner scroll instead of stretching the page */
    max-width: 100%;
    box-sizing: border-box;
    white-space: pre; /* preserve formatting */
    overflow-wrap: anywhere; /* allow very long words to wrap if necessary */
} 

.markdown-content pre code {
    background: none;
    border: none;
    padding: 0;
    font-size: 0.85em;
    line-height: 1.5;
}

.markdown-content blockquote {
    border-left: 4px solid var(--accent-color);
    margin: 12px 0;
    padding: 8px 16px;
    background: var(--bg-tertiary);
    border-radius: 0 8px 8px 0;
    color: var(--text-secondary);
}

.markdown-content a {
    color: var(--accent-color);
    text-decoration: none;
}

.markdown-content a:hover {
    text-decoration: underline;
}

.markdown-content hr {
    border: none;
    border-top: 1px solid var(--border-color);
    margin: 16px 0;
}

.markdown-content table {
    border-collapse: collapse;
    width: 100%;
    margin: 12px 0;
}

.markdown-content th,
.markdown-content td {
    border: 1px solid var(--border-color);
    padding: 8px 12px;
    text-align: left;
}

.markdown-content th {
    background: var(--bg-tertiary);
    font-weight: 600;
}

.markdown-content strong {
    font-weight: 600;
}

.markdown-content em {
    font-style: italic;
}

/* Code block header */
.code-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    background: var(--bg-tertiary);
    padding: 8px 12px;
    border-radius: 8px 8px 0 0;
    border: 1px solid var(--code-border);
    border-bottom: none;
    font-size: 0.8em;
    color: var(--text-muted);
}

.code-header + pre {
    margin-top: 0;
    border-radius: 0 0 8px 8px;
}

.copy-btn {
    background: var(--bg-secondary);
    border: 1px solid var(--border-color);
    color: var(--text-secondary);
    padding: 4px 8px;
    border-radius: 4px;
    cursor: pointer;
    font-size: 0.85em;
}

.copy-btn:hover {
    background: var(--accent-color);
    color: white;
}

/* ============================================
   Responsive Design
   ============================================ */

@media (max-width: 768px) {
    /* Allow page to scroll on small screens so the virtual keyboard can push content up */
    html, body {
        height: auto;
        overflow: auto;
    }

    /* Let the main container adjust height when viewport changes (mobile keyboards) */
    .chat-container {
        height: auto;
        min-height: 100vh; /* maintain full-screen look but allow shrinking */
    }

    .chat-header {
        flex-wrap: wrap;
        gap: 10px;
    }
    
    .header-right {
        width: 100%;
        justify-content: space-between;
    }
    
    .control-select {
        flex: 1;
        min-width: 0;
    }
    
    .message {
        max-width: 95%;
    }
    
    .session-id {
        display: none;
    }
}

/* ============================================
   Error State
   ============================================ */

.error-message {
    background: #fee2e2;
    color: #dc2626;
    padding: 12px 16px;
    border-radius: 8px;
    margin: 10px 20px;
    font-size: 0.9rem;
}

[data-theme="modern-dark"] .error-message,
[data-theme="retro-bbs"] .error-message,
[data-theme="as400"] .error-message,
[data-theme="dos-works"] .error-message {
    background: #3b1414;
    color: #fca5a5;
}

/* Loading state */
.loading {
    opacity: 0.7;
    pointer-events: none;
}