/* ============================================================
   TSDEV-LLM — Main Stylesheet v2.0
   Themes: void | synthwave | aurora | solar | cottoncandy
   ============================================================ */

@import url('https://fonts.googleapis.com/css2?family=Inter:wght@300;400;500;600;700&family=JetBrains+Mono:wght@400;500&display=swap');

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

/* ============================================================
   THEME DEFINITIONS — CSS Custom Properties per body class
   ============================================================ */

body.theme-void {
    --bg-base:        #05050f;
    --bg-surface:     rgba(14, 14, 30, 0.97);
    --bg-elevated:    rgba(24, 24, 48, 0.98);
    --bg-input:       rgba(0, 0, 0, 0.4);
    --text-primary:   #f0f0ff;
    --text-secondary: #9090b8;
    --text-muted:     #55557a;
    --accent:         #7c3aed;
    --accent-hover:   #9f67ff;
    --accent-glow:    rgba(124, 58, 237, 0.35);
    --accent-subtle:  rgba(124, 58, 237, 0.12);
    --accent-2:       #4f46e5;
    --border:         rgba(255, 255, 255, 0.07);
    --border-focus:   #9f67ff;
    --border-hover:   rgba(255, 255, 255, 0.15);
    --msg-user-bg:    linear-gradient(135deg, #7c3aed 0%, #4f46e5 100%);
    --msg-user-text:  #fff;
    --msg-bot-bg:     rgba(255, 255, 255, 0.04);
    --msg-bot-border: rgba(255, 255, 255, 0.07);
    --msg-bot-text:   #f0f0ff;
    --danger:         #ef4444;
    --danger-subtle:  rgba(239, 68, 68, 0.15);
    --success:        #22c55e;
    --code-bg:        #0a0a1c;
    --scrollbar:      rgba(124, 58, 237, 0.3);
    --sidebar-bg:     linear-gradient(180deg, rgba(10,10,22,0.98) 0%, rgba(16,10,32,0.98) 100%);
    --login-bg:       radial-gradient(ellipse 80% 50% at 20% 30%, rgba(124,58,237,0.18) 0%, transparent 60%),
                      radial-gradient(ellipse 60% 60% at 80% 70%, rgba(79,70,229,0.12) 0%, transparent 60%),
                      #05050f;
    --preview-a: #7c3aed; --preview-b: #0a0a1c; --preview-c: #4f46e5;
}

body.theme-dark {
    --bg-base:        #0f1115;
    --bg-surface:     rgba(22, 25, 30, 0.97);
    --bg-elevated:    rgba(32, 36, 43, 0.98);
    --bg-input:       rgba(0, 0, 0, 0.3);
    --text-primary:   #f0f0f5;
    --text-secondary: #a0a5b5;
    --text-muted:     #606575;
    --accent:         #3b82f6;
    --accent-hover:   #60a5fa;
    --accent-glow:    rgba(59, 130, 246, 0.35);
    --accent-subtle:  rgba(59, 130, 246, 0.12);
    --accent-2:       #2563eb;
    --border:         rgba(255, 255, 255, 0.08);
    --border-focus:   #3b82f6;
    --border-hover:   rgba(255, 255, 255, 0.18);
    --msg-user-bg:    linear-gradient(135deg, #3b82f6 0%, #1d4ed8 100%);
    --msg-user-text:  #fff;
    --msg-bot-bg:     rgba(255, 255, 255, 0.04);
    --msg-bot-border: rgba(255, 255, 255, 0.08);
    --msg-bot-text:   #f0f0f5;
    --danger:         #ef4444;
    --danger-subtle:  rgba(239, 68, 68, 0.15);
    --success:        #22c55e;
    --code-bg:        #181a20;
    --scrollbar:      rgba(59, 130, 246, 0.3);
    --sidebar-bg:     linear-gradient(180deg, rgba(18,20,24,0.98) 0%, rgba(24,26,32,0.98) 100%);
    --login-bg:       radial-gradient(ellipse 80% 50% at 20% 30%, rgba(59,130,246,0.15) 0%, transparent 60%),
                      radial-gradient(ellipse 60% 60% at 80% 70%, rgba(37,99,235,0.08) 0%, transparent 60%),
                      #0f1115;
    --preview-a: #3b82f6; --preview-b: #0f1115; --preview-c: #2563eb;
}

body.theme-synthwave {
    --bg-base:        #060010;
    --bg-surface:     rgba(16, 4, 36, 0.97);
    --bg-elevated:    rgba(26, 8, 55, 0.98);
    --bg-input:       rgba(0, 0, 0, 0.45);
    --text-primary:   #f8e8ff;
    --text-secondary: #b080c8;
    --text-muted:     #704888;
    --accent:         #ff2d78;
    --accent-hover:   #ff6ba8;
    --accent-glow:    rgba(255, 45, 120, 0.4);
    --accent-subtle:  rgba(255, 45, 120, 0.1);
    --accent-2:       #00e5ff;
    --border:         rgba(255, 45, 120, 0.12);
    --border-focus:   #ff2d78;
    --border-hover:   rgba(255, 45, 120, 0.25);
    --msg-user-bg:    linear-gradient(135deg, #ff2d78 0%, #aa007a 100%);
    --msg-user-text:  #fff;
    --msg-bot-bg:     rgba(0, 229, 255, 0.06);
    --msg-bot-border: rgba(0, 229, 255, 0.12);
    --msg-bot-text:   #f8e8ff;
    --danger:         #ff5060;
    --danger-subtle:  rgba(255, 80, 96, 0.15);
    --success:        #00ff88;
    --code-bg:        #08001e;
    --scrollbar:      rgba(255, 45, 120, 0.35);
    --sidebar-bg:     linear-gradient(180deg, rgba(16,4,36,0.98) 0%, rgba(22,4,50,0.98) 100%);
    --login-bg:       radial-gradient(ellipse 70% 50% at 50% 0%, rgba(255,45,120,0.2) 0%, transparent 60%),
                      radial-gradient(ellipse 60% 60% at 50% 100%, rgba(0,229,255,0.1) 0%, transparent 60%),
                      #060010;
    --preview-a: #ff2d78; --preview-b: #06001a; --preview-c: #00e5ff;
}

body.theme-aurora {
    --bg-base:        #020f0a;
    --bg-surface:     rgba(5, 24, 17, 0.97);
    --bg-elevated:    rgba(8, 38, 28, 0.98);
    --bg-input:       rgba(0, 0, 0, 0.4);
    --text-primary:   #e8fff8;
    --text-secondary: #60b090;
    --text-muted:     #306850;
    --accent:         #00d4aa;
    --accent-hover:   #00ffcc;
    --accent-glow:    rgba(0, 212, 170, 0.35);
    --accent-subtle:  rgba(0, 212, 170, 0.1);
    --accent-2:       #00ff88;
    --border:         rgba(0, 212, 170, 0.1);
    --border-focus:   #00d4aa;
    --border-hover:   rgba(0, 212, 170, 0.22);
    --msg-user-bg:    linear-gradient(135deg, #00d4aa 0%, #007a60 100%);
    --msg-user-text:  #fff;
    --msg-bot-bg:     rgba(0, 212, 170, 0.06);
    --msg-bot-border: rgba(0, 212, 170, 0.1);
    --msg-bot-text:   #e8fff8;
    --danger:         #ff5555;
    --danger-subtle:  rgba(255, 85, 85, 0.15);
    --success:        #00ff88;
    --code-bg:        #010d07;
    --scrollbar:      rgba(0, 212, 170, 0.35);
    --sidebar-bg:     linear-gradient(180deg, rgba(5,24,17,0.98) 0%, rgba(6,30,22,0.98) 100%);
    --login-bg:       radial-gradient(ellipse 80% 60% at 20% 40%, rgba(0,212,170,0.15) 0%, transparent 60%),
                      radial-gradient(ellipse 60% 50% at 80% 60%, rgba(0,255,136,0.08) 0%, transparent 60%),
                      #020f0a;
    --preview-a: #00d4aa; --preview-b: #02100a; --preview-c: #00ff88;
}

body.theme-solar {
    --bg-base:        #faf8f2;
    --bg-surface:     rgba(255, 253, 246, 0.98);
    --bg-elevated:    #ffffff;
    --bg-input:       rgba(0, 0, 0, 0.04);
    --text-primary:   #1c1408;
    --text-secondary: #7a6040;
    --text-muted:     #a08060;
    --accent:         #d97706;
    --accent-hover:   #b45309;
    --accent-glow:    rgba(217, 119, 6, 0.25);
    --accent-subtle:  rgba(217, 119, 6, 0.1);
    --accent-2:       #ea580c;
    --border:         rgba(0, 0, 0, 0.09);
    --border-focus:   #d97706;
    --border-hover:   rgba(0, 0, 0, 0.18);
    --msg-user-bg:    linear-gradient(135deg, #d97706 0%, #ea580c 100%);
    --msg-user-text:  #fff;
    --msg-bot-bg:     rgba(0, 0, 0, 0.035);
    --msg-bot-border: rgba(0, 0, 0, 0.08);
    --msg-bot-text:   #1c1408;
    --danger:         #dc2626;
    --danger-subtle:  rgba(220, 38, 38, 0.1);
    --success:        #16a34a;
    --code-bg:        #f0ede4;
    --scrollbar:      rgba(217, 119, 6, 0.35);
    --sidebar-bg:     linear-gradient(180deg, #fff9ef 0%, #fff5e8 100%);
    --login-bg:       radial-gradient(ellipse 70% 50% at 30% 30%, rgba(217,119,6,0.08) 0%, transparent 60%),
                      #faf8f2;
    --preview-a: #d97706; --preview-b: #faf8f2; --preview-c: #ea580c;
}

body.theme-cottoncandy {
    --bg-base:        #0c0514;
    --bg-surface:     rgba(20, 8, 34, 0.97);
    --bg-elevated:    rgba(30, 10, 50, 0.98);
    --bg-input:       rgba(0, 0, 0, 0.38);
    --text-primary:   #fdf4ff;
    --text-secondary: #d090e8;
    --text-muted:     #8050a8;
    --accent:         #e879f9;
    --accent-hover:   #f5a8ff;
    --accent-glow:    rgba(232, 121, 249, 0.35);
    --accent-subtle:  rgba(232, 121, 249, 0.1);
    --accent-2:       #a855f7;
    --border:         rgba(232, 121, 249, 0.12);
    --border-focus:   #e879f9;
    --border-hover:   rgba(232, 121, 249, 0.25);
    --msg-user-bg:    linear-gradient(135deg, #e879f9 0%, #a855f7 100%);
    --msg-user-text:  #fff;
    --msg-bot-bg:     rgba(232, 121, 249, 0.06);
    --msg-bot-border: rgba(232, 121, 249, 0.12);
    --msg-bot-text:   #fdf4ff;
    --danger:         #f87171;
    --danger-subtle:  rgba(248, 113, 113, 0.15);
    --success:        #4ade80;
    --code-bg:        #09001a;
    --scrollbar:      rgba(232, 121, 249, 0.35);
    --sidebar-bg:     linear-gradient(180deg, rgba(20,8,34,0.98) 0%, rgba(26,8,45,0.98) 100%);
    --login-bg:       radial-gradient(ellipse 70% 50% at 30% 20%, rgba(232,121,249,0.18) 0%, transparent 55%),
                      radial-gradient(ellipse 60% 50% at 70% 80%, rgba(168,85,247,0.14) 0%, transparent 55%),
                      #0c0514;
    --preview-a: #e879f9; --preview-b: #0c0514; --preview-c: #a855f7;
}

/* ============================================================
   SHARED LAYOUT CONSTANTS
   ============================================================ */
:root {
    --font-main: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
    --font-mono: 'JetBrains Mono', 'Cascadia Code', 'Fira Code', monospace;
    --radius-sm:  6px;
    --radius-md:  12px;
    --radius-lg:  18px;
    --radius-xl:  28px;
    --ease:       cubic-bezier(0.4, 0, 0.2, 1);
    --t-fast:     0.15s;
    --t-med:      0.25s;
    --sidebar-w:  272px;
    --header-h:   62px;
}

html, body {
    height: 100%;
    font-family: var(--font-main);
    font-size: 16px;
    line-height: 1.6;
    color: var(--text-primary);
    background: var(--bg-base);
}

::-webkit-scrollbar { width: 6px; height: 6px; }
::-webkit-scrollbar-track { background: transparent; }
::-webkit-scrollbar-thumb { background: var(--scrollbar); border-radius: 99px; }

/* ============================================================
   LOGIN PAGE
   ============================================================ */
.login-page {
    min-height: 100vh;
    display: flex;
    align-items: center;
    justify-content: center;
    background: var(--login-bg);
    padding: 1.5rem;
    position: relative;
    overflow: hidden;
}

.login-container {
    background: var(--bg-surface);
    backdrop-filter: blur(24px);
    -webkit-backdrop-filter: blur(24px);
    border: 1px solid var(--border);
    border-radius: var(--radius-xl);
    padding: 3rem;
    width: 100%;
    max-width: 440px;
    box-shadow: 0 0 0 1px var(--border), 0 20px 60px rgba(0,0,0,0.4), 0 0 80px var(--accent-subtle);
    opacity: 0;
    transform: translateY(20px);
    animation: loginFadeUp 0.5s var(--ease) forwards;
}

@keyframes loginFadeUp {
    to { opacity: 1; transform: translateY(0); }
}

.login-header { text-align: center; margin-bottom: 2.5rem; }

.logo { font-size: 3.5rem; display: block; margin-bottom: 0.75rem;
        filter: drop-shadow(0 0 14px var(--accent-glow)); }

.login-header h1 {
    font-size: 2rem; font-weight: 700; letter-spacing: -0.03em;
    background: linear-gradient(135deg, var(--text-primary) 0%, var(--text-secondary) 100%);
    -webkit-background-clip: text; -webkit-text-fill-color: transparent; background-clip: text;
}

.login-header .subtitle { color: var(--text-muted); font-size: 0.9rem; margin-top: 0.4rem; }

.form-group { margin-bottom: 1.25rem; }

.form-group label {
    display: block; margin-bottom: 0.5rem;
    font-size: 0.875rem; font-weight: 500; color: var(--text-secondary);
}

.form-group input {
    width: 100%; padding: 0.8rem 1rem;
    background: var(--bg-input); border: 1px solid var(--border);
    border-radius: var(--radius-md); color: var(--text-primary);
    font-family: var(--font-main); font-size: 0.95rem;
    outline: none; transition: border-color var(--t-fast) var(--ease), box-shadow var(--t-fast) var(--ease);
}

.form-group input:focus {
    border-color: var(--border-focus);
    box-shadow: 0 0 0 3px var(--accent-subtle);
}

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

.form-hint { display: block; margin-top: 0.35rem; font-size: 0.78rem; color: var(--text-muted); }

/* Buttons */
.btn {
    display: inline-flex; align-items: center; justify-content: center; gap: 0.5rem;
    padding: 0.8rem 1.5rem; border: none; border-radius: var(--radius-md);
    font-family: var(--font-main); font-size: 0.95rem; font-weight: 600;
    cursor: pointer; text-decoration: none; transition: all var(--t-fast) var(--ease);
}
.btn:active { transform: scale(0.97); }

.btn-primary {
    width: 100%; margin-top: 0.75rem;
    background: linear-gradient(135deg, var(--accent) 0%, var(--accent-2) 100%);
    color: var(--msg-user-text); box-shadow: 0 4px 16px var(--accent-glow);
}
.btn-primary:hover { opacity: 0.9; box-shadow: 0 6px 22px var(--accent-glow); transform: translateY(-1px); }

.btn-outline {
    background: transparent; color: var(--text-secondary);
    border: 1px solid var(--border); padding: 0.45rem 1rem; font-size: 0.85rem;
}
.btn-outline:hover { background: var(--accent-subtle); border-color: var(--border-focus); color: var(--text-primary); }

.btn-danger {
    background: var(--danger-subtle); border: 1px solid var(--danger); color: var(--danger);
    padding: 0.4rem 0.85rem; font-size: 0.8rem;
}
.btn-danger:hover { background: var(--danger); color: #fff; }

.btn-primary.loading { pointer-events: none; opacity: 0.7; }
.btn-primary.loading::after {
    content: ''; display: inline-block; width: 14px; height: 14px; margin-left: 6px;
    border: 2px solid rgba(255,255,255,0.3); border-top-color: #fff;
    border-radius: 50%; animation: spin 0.6s linear infinite;
}

@keyframes spin { to { transform: rotate(360deg); } }

.error-message {
    color: var(--danger); font-size: 0.875rem; text-align: center;
    padding: 0.7rem; border-radius: var(--radius-md); margin-top: 1.25rem;
    background: var(--danger-subtle); border: 1px solid rgba(239,68,68,0.25);
    animation: shake 0.4s ease;
}

@keyframes shake {
    0%, 100% { transform: translateX(0); }
    20% { transform: translateX(-6px); }
    40% { transform: translateX(6px); }
    60% { transform: translateX(-4px); }
    80% { transform: translateX(4px); }
}

/* Theme toggle on login */
.theme-toggle-row {
    display: flex; justify-content: center; gap: 0.5rem;
    margin-top: 2rem; padding-top: 1.5rem; border-top: 1px solid var(--border);
}

.theme-dot {
    width: 22px; height: 22px; border-radius: 50%; cursor: pointer;
    border: 2px solid transparent; transition: transform var(--t-fast), border-color var(--t-fast);
    position: relative;
}
.theme-dot:hover { transform: scale(1.2); }
.theme-dot.active { border-color: var(--text-primary); }
.theme-dot[data-theme="void"]        { background: linear-gradient(135deg, #7c3aed, #05050f); }
.theme-dot[data-theme="synthwave"]   { background: linear-gradient(135deg, #ff2d78, #00e5ff); }
.theme-dot[data-theme="aurora"]      { background: linear-gradient(135deg, #00d4aa, #02100a); }
.theme-dot[data-theme="solar"]       { background: linear-gradient(135deg, #d97706, #faf8f2); }
.theme-dot[data-theme="cottoncandy"] { background: linear-gradient(135deg, #e879f9, #a855f7); }

/* ============================================================
   CHAT PAGE — App Shell
   ============================================================ */
body.chat-page {
    height: 100vh; overflow: hidden; display: flex; flex-direction: column;
}

.app-layout {
    display: flex; height: 100vh; overflow: hidden;
}

/* ─── Sidebar ─────────────────────────────────────────────── */
.sidebar {
    width: var(--sidebar-w); flex-shrink: 0;
    display: flex; flex-direction: column;
    background: var(--sidebar-bg);
    border-right: 1px solid var(--border);
    overflow: hidden; transition: width var(--t-med) var(--ease);
    z-index: 50;
}

.sidebar-top {
    padding: 1.2rem 1rem 0.75rem;
    border-bottom: 1px solid var(--border);
}

.brand-sidebar {
    font-size: 0.8rem; font-weight: 700; letter-spacing: 0.1em;
    color: var(--accent); text-transform: uppercase; margin-bottom: 0.9rem;
}

.btn-new-chat {
    width: 100%; padding: 0.65rem 1rem;
    background: var(--accent-subtle); border: 1px solid var(--border);
    border-radius: var(--radius-md); color: var(--text-primary);
    font-family: var(--font-main); font-size: 0.875rem; font-weight: 500;
    cursor: pointer; display: flex; align-items: center; gap: 0.5rem;
    transition: all var(--t-fast) var(--ease);
}
.btn-new-chat:hover { background: var(--accent); border-color: var(--accent); color: #fff; }

.sessions-section { flex: 1; overflow-y: auto; padding: 0.5rem; }

.sessions-label {
    font-size: 0.7rem; font-weight: 600; letter-spacing: 0.1em;
    color: var(--text-muted); text-transform: uppercase; padding: 0.5rem 0.5rem 0.25rem;
}

.session-item {
    width: 100%; background: none; border: 1px solid transparent;
    border-radius: var(--radius-md); padding: 0.6rem 0.75rem;
    display: flex; align-items: center; gap: 0.6rem; cursor: pointer;
    text-align: left; font-family: var(--font-main); color: var(--text-secondary);
    transition: all var(--t-fast) var(--ease); margin-bottom: 2px;
}
.session-item:hover { background: var(--accent-subtle); color: var(--text-primary); border-color: var(--border); }
.session-item.active { background: var(--accent-subtle); border-color: var(--border-focus); color: var(--text-primary); }

.session-item-icon { font-size: 0.875rem; flex-shrink: 0; opacity: 0.6; }

.session-item-content { flex: 1; min-width: 0; }

.session-item-title {
    font-size: 0.85rem; font-weight: 500;
    white-space: nowrap; overflow: hidden; text-overflow: ellipsis;
    display: block;
}

.session-item-date { font-size: 0.72rem; color: var(--text-muted); margin-top: 1px; }

.sessions-empty { color: var(--text-muted); font-size: 0.82rem; padding: 1rem 0.5rem; text-align: center; }

.sidebar-bottom {
    padding: 0.75rem 1rem; border-top: 1px solid var(--border);
    display: flex; flex-direction: column; gap: 0.6rem;
}

.user-row {
    display: flex; align-items: center; gap: 0.65rem; min-width: 0;
}

.user-avatar-badge {
    width: 34px; height: 34px; border-radius: 50%; flex-shrink: 0;
    background: linear-gradient(135deg, var(--accent) 0%, var(--accent-2) 100%);
    display: flex; align-items: center; justify-content: center;
    font-weight: 700; font-size: 0.9rem; color: #fff;
    box-shadow: 0 0 10px var(--accent-glow);
}

.user-info-text { min-width: 0; flex: 1; }
.user-display-name { font-size: 0.85rem; font-weight: 600; white-space: nowrap; overflow: hidden; text-overflow: ellipsis; }
.user-role-label { font-size: 0.72rem; color: var(--text-muted); }

.sidebar-actions { display: flex; align-items: center; gap: 0.4rem; }

.icon-btn {
    width: 32px; height: 32px; border-radius: var(--radius-sm);
    border: 1px solid var(--border); background: transparent;
    display: flex; align-items: center; justify-content: center;
    cursor: pointer; font-size: 0.85rem; color: var(--text-secondary);
    transition: all var(--t-fast) var(--ease); text-decoration: none;
    flex-shrink: 0;
}
.icon-btn:hover { background: var(--accent-subtle); border-color: var(--border-focus); color: var(--text-primary); }
.icon-btn.danger:hover { background: var(--danger-subtle); border-color: var(--danger); color: var(--danger); }

/* ─── Main Chat Area ──────────────────────────────────────── */
.chat-main {
    flex: 1; display: flex; flex-direction: column;
    overflow: hidden; background: var(--bg-base); min-width: 0;
}

.chat-header {
    height: var(--header-h); flex-shrink: 0; padding: 0 1.5rem;
    display: flex; align-items: center; gap: 0.75rem;
    background: var(--bg-surface); border-bottom: 1px solid var(--border);
    backdrop-filter: blur(10px);
}

.session-title-wrap { flex: 1; display: flex; align-items: center; gap: 0.5rem; min-width: 0; }

.session-title {
    font-size: 1.05rem; font-weight: 600;
    white-space: nowrap; overflow: hidden; text-overflow: ellipsis;
    outline: none; border-radius: var(--radius-sm); padding: 2px 4px;
    transition: background var(--t-fast);
}
.session-title[contenteditable="true"] {
    background: var(--bg-input); border: 1px solid var(--border-focus);
    padding: 2px 8px; border-radius: var(--radius-sm); min-width: 60px;
}

.header-spacer { flex: 1; }

/* ─── Empty State ─────────────────────────────────────────── */
.empty-state {
    flex: 1; display: flex; flex-direction: column;
    align-items: center; justify-content: center; text-align: center; gap: 1rem;
    padding: 2rem; color: var(--text-secondary);
}

.empty-icon { font-size: 4rem; filter: drop-shadow(0 0 20px var(--accent-glow)); }
.empty-state h2 { font-size: 1.75rem; font-weight: 700; color: var(--text-primary); }
.empty-state p  { color: var(--text-muted); }
.btn-start-chat {
    margin-top: 0.5rem; padding: 0.8rem 2rem;
    background: linear-gradient(135deg, var(--accent), var(--accent-2));
    color: #fff; border: none; border-radius: var(--radius-lg);
    font-family: var(--font-main); font-size: 1rem; font-weight: 600;
    cursor: pointer; box-shadow: 0 4px 18px var(--accent-glow);
    transition: all var(--t-fast) var(--ease);
}
.btn-start-chat:hover { transform: translateY(-2px); box-shadow: 0 8px 24px var(--accent-glow); }

/* ─── Messages Area ───────────────────────────────────────── */
.chat-interface { flex: 1; display: flex; flex-direction: column; overflow: hidden; min-height: 0; }

.messages-area {
    flex: 1; overflow-y: auto; padding: 1.5rem;
    display: flex; flex-direction: column; gap: 1rem;
    scroll-behavior: smooth;
}

.message { display: flex; align-items: flex-end; gap: 0.65rem; max-width: 82%; }
.message-user { align-self: flex-end; flex-direction: row-reverse; }
.message-bot  { align-self: flex-start; }

.msg-avatar {
    width: 30px; height: 30px; border-radius: 50%; flex-shrink: 0;
    display: flex; align-items: center; justify-content: center;
    font-size: 0.8rem; font-weight: 700;
}
.msg-avatar.user-av {
    background: linear-gradient(135deg, var(--accent), var(--accent-2));
    color: #fff; box-shadow: 0 0 8px var(--accent-glow);
}
.msg-avatar.bot-av {
    background: var(--msg-bot-bg); border: 1px solid var(--msg-bot-border);
    font-size: 1rem;
}

.message-bubble { display: flex; flex-direction: column; gap: 0.25rem; max-width: 100%; }

.bubble {
    padding: 0.75rem 1rem; border-radius: var(--radius-lg);
    font-size: 1rem; line-height: 1.6; word-wrap: break-word;
}
.message-user .bubble {
    background: var(--msg-user-bg); color: var(--msg-user-text);
    border-radius: var(--radius-lg) var(--radius-lg) var(--radius-sm) var(--radius-lg);
    box-shadow: 0 2px 12px var(--accent-glow);
}
.message-bot .bubble {
    background: var(--msg-bot-bg); color: var(--msg-bot-text);
    border: 1px solid var(--msg-bot-border);
    border-radius: var(--radius-lg) var(--radius-lg) var(--radius-lg) var(--radius-sm);
}
.message-error .bubble {
    background: var(--danger-subtle); border: 1px solid var(--danger);
    color: var(--danger); border-radius: var(--radius-md);
}

.msg-time { font-size: 0.7rem; color: var(--text-muted); padding: 0 0.25rem; }
.message-user .msg-time { text-align: right; }

/* Typing indicator */
.typing-dots { display: flex; gap: 5px; align-items: center; padding: 0.1rem 0; }
.typing-dots span {
    width: 7px; height: 7px; border-radius: 50%; background: var(--text-muted);
    animation: typingBounce 1.2s ease-in-out infinite;
}
.typing-dots span:nth-child(2) { animation-delay: 0.2s; }
.typing-dots span:nth-child(3) { animation-delay: 0.4s; }
@keyframes typingBounce { 0%, 60%, 100% { transform: translateY(0); } 30% { transform: translateY(-7px); } }

/* ─── Markdown Content ────────────────────────────────────── */
.markdown-content h1, .markdown-content h2, .markdown-content h3,
.markdown-content h4, .markdown-content h5, .markdown-content h6 {
    margin: 1em 0 0.4em; font-weight: 600; line-height: 1.3; color: var(--text-primary);
}
.markdown-content h1 { font-size: 1.3em; }
.markdown-content h2 { font-size: 1.15em; }
.markdown-content h3 { font-size: 1.05em; }
.markdown-content p { margin: 0.5em 0; }
.markdown-content p:first-child { margin-top: 0; }
.markdown-content p:last-child  { margin-bottom: 0; }
.markdown-content ul, .markdown-content ol { padding-left: 1.5em; margin: 0.5em 0; }
.markdown-content li { margin: 0.2em 0; }
.markdown-content a { color: var(--accent-hover); text-decoration: underline; }
.markdown-content blockquote {
    border-left: 3px solid var(--accent); padding-left: 1em; margin: 0.75em 0;
    color: var(--text-secondary); font-style: italic;
}
.markdown-content hr { border: none; border-top: 1px solid var(--border); margin: 1em 0; }
.markdown-content strong { font-weight: 700; color: var(--text-primary); }
.markdown-content em { font-style: italic; }
.markdown-content code:not(pre code) {
    background: var(--code-bg); color: var(--accent-hover);
    padding: 0.15em 0.4em; border-radius: 4px;
    font-family: var(--font-mono); font-size: 0.85em;
}
.markdown-content table {
    border-collapse: collapse; width: 100%; margin: 0.75em 0; font-size: 0.875em;
}
.markdown-content th, .markdown-content td {
    border: 1px solid var(--border); padding: 0.5em 0.75em; text-align: left;
}
.markdown-content th { background: var(--bg-elevated); font-weight: 600; }

/* ─── Code Blocks ─────────────────────────────────────────── */
.code-block {
    border-radius: var(--radius-md); overflow: hidden;
    border: 1px solid var(--border); margin: 0.75em 0;
}
.code-header {
    display: flex; align-items: center; justify-content: space-between;
    padding: 0.45rem 0.85rem;
    background: rgba(0,0,0,0.3); border-bottom: 1px solid var(--border);
}
.code-lang {
    font-family: var(--font-mono); font-size: 0.75rem;
    color: var(--text-muted); text-transform: lowercase;
}
.copy-btn {
    display: flex; align-items: center; gap: 0.35rem;
    background: transparent; border: 1px solid var(--border);
    border-radius: var(--radius-sm); padding: 0.2rem 0.6rem;
    font-family: var(--font-main); font-size: 0.72rem; font-weight: 500;
    color: var(--text-secondary); cursor: pointer;
    transition: all var(--t-fast) var(--ease);
}
.copy-btn:hover { background: var(--accent-subtle); border-color: var(--border-focus); color: var(--text-primary); }
.copy-btn.copied { background: rgba(34,197,94,0.15); border-color: var(--success); color: var(--success); }

.code-block pre {
    margin: 0; padding: 1rem;
    background: var(--code-bg); overflow-x: auto;
    font-family: var(--font-mono); font-size: 0.85rem; line-height: 1.6;
}
.code-block pre code { background: none; color: inherit; padding: 0; border-radius: 0; font-size: inherit; }

/* ─── Input Area ──────────────────────────────────────────── */
.chat-input-section {
    padding: 1rem 1.5rem 1.25rem; border-top: 1px solid var(--border);
    background: var(--bg-surface); backdrop-filter: blur(10px);
}

.input-wrapper {
    display: flex; align-items: flex-end; gap: 0.65rem;
    background: var(--bg-input); border: 1px solid var(--border);
    border-radius: var(--radius-lg); padding: 0.6rem 0.6rem 0.6rem 1rem;
    transition: border-color var(--t-fast), box-shadow var(--t-fast);
}
.input-wrapper:focus-within {
    border-color: var(--border-focus);
    box-shadow: 0 0 0 3px var(--accent-subtle);
}

#messageInput {
    flex: 1; background: transparent; border: none; outline: none;
    color: var(--text-primary); font-family: var(--font-main); font-size: 0.95rem;
    resize: none; max-height: 200px; line-height: 1.5;
    scrollbar-width: thin; scrollbar-color: var(--scrollbar) transparent;
}
#messageInput::placeholder { color: var(--text-muted); }

.send-btn {
    width: 36px; height: 36px; flex-shrink: 0;
    background: linear-gradient(135deg, var(--accent), var(--accent-2));
    border: none; border-radius: var(--radius-md);
    display: flex; align-items: center; justify-content: center;
    cursor: pointer; color: #fff; transition: all var(--t-fast) var(--ease);
    box-shadow: 0 2px 8px var(--accent-glow);
}
.send-btn:hover:not(:disabled) { opacity: 0.9; transform: scale(1.05); }
.send-btn:disabled { opacity: 0.35; cursor: not-allowed; }

.input-hint {
    font-size: 0.72rem; color: var(--text-muted); margin-top: 0.5rem;
    text-align: center;
}

/* ─── Theme Picker Popup ──────────────────────────────────── */
.theme-picker {
    position: fixed; bottom: 80px; left: 1rem; z-index: 200;
    background: var(--bg-elevated); border: 1px solid var(--border);
    border-radius: var(--radius-lg); padding: 1rem;
    box-shadow: 0 8px 32px rgba(0,0,0,0.4);
    min-width: 220px;
}

.theme-picker-title {
    font-size: 0.75rem; font-weight: 600; letter-spacing: 0.08em;
    color: var(--text-muted); text-transform: uppercase; margin-bottom: 0.75rem;
}

.theme-grid { display: flex; flex-direction: column; gap: 0.4rem; }

.theme-option {
    display: flex; align-items: center; gap: 0.75rem;
    background: none; border: 1px solid transparent; border-radius: var(--radius-md);
    padding: 0.5rem 0.65rem; cursor: pointer; font-family: var(--font-main);
    font-size: 0.875rem; color: var(--text-secondary); text-align: left;
    transition: all var(--t-fast) var(--ease);
}
.theme-option:hover { background: var(--accent-subtle); color: var(--text-primary); border-color: var(--border); }
.theme-option.active { border-color: var(--border-focus); color: var(--text-primary); background: var(--accent-subtle); }

.theme-preview {
    width: 24px; height: 24px; border-radius: 50%; flex-shrink: 0;
    box-shadow: 0 0 6px var(--accent-glow);
}
.theme-option[data-theme="void"] .theme-preview       { background: linear-gradient(135deg, #7c3aed, #05050f); }
.theme-option[data-theme="dark"] .theme-preview       { background: linear-gradient(135deg, #3b82f6, #0f1115); }
.theme-option[data-theme="synthwave"] .theme-preview  { background: linear-gradient(135deg, #ff2d78, #00e5ff); }
.theme-option[data-theme="aurora"] .theme-preview     { background: linear-gradient(135deg, #00d4aa, #02100a); }
.theme-option[data-theme="solar"] .theme-preview      { background: linear-gradient(135deg, #d97706, #faf8f2); }
.theme-option[data-theme="cottoncandy"] .theme-preview{ background: linear-gradient(135deg, #e879f9, #a855f7); }

/* ─── Admin Panel ─────────────────────────────────────────── */
.admin-page { min-height: 100vh; background: var(--bg-base); }

.admin-header {
    background: var(--bg-surface); border-bottom: 1px solid var(--border);
    padding: 1rem 2rem; display: flex; align-items: center; gap: 1rem;
    backdrop-filter: blur(10px);
}

.admin-header h1 { font-size: 1.2rem; font-weight: 700; flex: 1; }

.admin-content { max-width: 1000px; margin: 0 auto; padding: 2rem; }

.admin-tabs { display: flex; gap: 0.25rem; margin-bottom: 2rem; }

.admin-tab {
    padding: 0.6rem 1.25rem; border-radius: var(--radius-md);
    border: 1px solid var(--border); background: transparent;
    font-family: var(--font-main); font-size: 0.875rem; font-weight: 500;
    color: var(--text-secondary); cursor: pointer; transition: all var(--t-fast);
}
.admin-tab.active { background: var(--accent-subtle); border-color: var(--border-focus); color: var(--text-primary); }

.admin-card {
    background: var(--bg-surface); border: 1px solid var(--border);
    border-radius: var(--radius-lg); padding: 1.5rem; margin-bottom: 1.5rem;
}

.admin-card h2 { font-size: 1rem; font-weight: 600; margin-bottom: 1.25rem; }

.admin-table { width: 100%; border-collapse: collapse; font-size: 0.875rem; }
.admin-table th { text-align: left; padding: 0.6rem 0.75rem; color: var(--text-muted); font-weight: 500; border-bottom: 1px solid var(--border); }
.admin-table td { padding: 0.75rem; border-bottom: 1px solid var(--border); }
.admin-table tr:last-child td { border-bottom: none; }
.admin-table tr:hover td { background: var(--accent-subtle); }

.badge {
    display: inline-flex; align-items: center;
    padding: 0.15rem 0.55rem; border-radius: 99px; font-size: 0.72rem; font-weight: 600;
}
.badge-admin  { background: var(--accent-subtle); border: 1px solid var(--border-focus); color: var(--accent-hover); }
.badge-user   { background: var(--bg-input); border: 1px solid var(--border); color: var(--text-muted); }
.badge-active { background: rgba(34,197,94,0.15); border: 1px solid var(--success); color: var(--success); }

.form-row { display: grid; grid-template-columns: 1fr 1fr; gap: 1rem; margin-bottom: 1rem; }
.form-row.single { grid-template-columns: 1fr; }
.form-row.triple { grid-template-columns: 1fr 1fr 1fr; }

.admin-input {
    width: 100%; padding: 0.65rem 0.85rem;
    background: var(--bg-input); border: 1px solid var(--border);
    border-radius: var(--radius-md); color: var(--text-primary);
    font-family: var(--font-main); font-size: 0.875rem; outline: none;
    transition: border-color var(--t-fast);
}
.admin-input:focus { border-color: var(--border-focus); box-shadow: 0 0 0 2px var(--accent-subtle); }

.admin-label { display: block; margin-bottom: 0.4rem; font-size: 0.8rem; color: var(--text-secondary); font-weight: 500; }

.checkbox-row { display: flex; align-items: center; gap: 0.5rem; font-size: 0.875rem; color: var(--text-secondary); }
.checkbox-row input[type="checkbox"] { accent-color: var(--accent); width: 15px; height: 15px; }

.modal-overlay {
    position: fixed; inset: 0; background: rgba(0,0,0,0.7);
    display: flex; align-items: center; justify-content: center;
    z-index: 500; backdrop-filter: blur(4px);
}
.modal {
    background: var(--bg-elevated); border: 1px solid var(--border);
    border-radius: var(--radius-xl); padding: 2rem; max-width: 420px; width: 90%;
    box-shadow: 0 20px 60px rgba(0,0,0,0.5);
}
.modal h3 { font-size: 1.1rem; font-weight: 700; margin-bottom: 0.5rem; }
.modal p  { color: var(--text-secondary); font-size: 0.875rem; margin-bottom: 1.25rem; }
.modal-actions { display: flex; gap: 0.5rem; justify-content: flex-end; }

#totp-canvas { display: block; margin: 1rem auto; border-radius: var(--radius-md); }
.totp-secret-display {
    font-family: var(--font-mono); font-size: 0.8rem; background: var(--code-bg);
    padding: 0.5rem 0.75rem; border-radius: var(--radius-sm); text-align: center;
    color: var(--text-secondary); word-break: break-all; margin-top: 0.75rem;
}

/* ─── Responsive ──────────────────────────────────────────── */
@media (max-width: 768px) {
    .sidebar {
        position: fixed; left: 0; top: 0; bottom: 0; z-index: 100;
        transform: translateX(-100%); transition: transform var(--t-med) var(--ease);
    }
    .sidebar.open { transform: translateX(0); }
    .sidebar-overlay {
        position: fixed; inset: 0; background: rgba(0,0,0,0.5);
        z-index: 90; display: none;
    }
    .sidebar-overlay.show { display: block; }
    .sidebar-toggle-btn { display: flex !important; }
    .form-row { grid-template-columns: 1fr; }
    .admin-content { padding: 1rem; }
}