:root {
    /* 🖤 Professional Black & Neon Purple Theme (Dark Mode) */
    --bg-primary: #000000;
    --bg-secondary: #0a0a0a;
    --bg-tertiary: #141414;
    --glass-bg: rgba(255, 255, 255, 0.03);
    --glass-border: rgba(255, 255, 255, 0.1);
    --text-primary: #ffffff;
    --text-secondary: #a1a1aa;
    --text-tertiary: #71717a;
    --accent-primary: #a855f7;
    --accent-secondary: #c084fc;
    --accent-gradient: linear-gradient(135deg, #a855f7 0%, #c084fc 100%);
    --accent-glow: rgba(168, 85, 247, 0.3);
    --success: #10b981;
    --error: #ef4444;
    --shadow: rgba(0, 0, 0, 0.8);
    --shadow-colored: rgba(168, 85, 247, 0.25);
}

[data-theme="light"] {
    /* 🌟 Vibrant Professional Theme (Light Mode) */
    --bg-primary: #f8fafc;
    --bg-secondary: #f1f5f9;
    --bg-tertiary: #e2e8f0;
    --glass-bg: rgba(255, 255, 255, 0.85);
    --glass-border: rgba(71, 85, 105, 0.15);
    --text-primary: #0f172a;
    --text-secondary: #334155;
    --text-tertiary: #64748b;
    --accent-primary: #3b82f6;
    --accent-secondary: #8b5cf6;
    --accent-gradient: linear-gradient(135deg, #3b82f6 0%, #8b5cf6 100%);
    --accent-glow: rgba(59, 130, 246, 0.2);
    --success: #10b981;
    --error: #ef4444;
    --shadow: rgba(0, 0, 0, 0.1);
    --shadow-colored: rgba(59, 130, 246, 0.15);
    --gradient-light: linear-gradient(-45deg, #dbeafe, #e0e7ff, #ddd6fe, #fce7f3);
}

/* Reset & Base Styles */
* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
    font-family: 'National Park', 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;
}

body {
    background: var(--bg-primary);
    color: var(--text-primary);
    line-height: 1.6;
    transition: background 0.3s ease, color 0.3s ease;
}

/* Common Component Styles */
.glass-effect,
.navbar,
.sidebar-header,
.new-chat-btn,
.input-group textarea,
.sidebar-toggle,
.theme-toggle-btn,
.copy-code-btn,
.copy-response-btn,
.auth-card,
.input-with-icon input,
.input-container,
.message-content {
    background: var(--glass-bg);
    backdrop-filter: blur(20px) saturate(180%);
    -webkit-backdrop-filter: blur(20px) saturate(180%);
    border: 1px solid var(--glass-border);
}

.gradient-text,
.nav-brand,
.auth-header h1 {
    background: var(--accent-gradient);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.btn-interactive,
.auth-button,
.send-btn {
    transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
    cursor: pointer;
    position: relative;
    overflow: hidden;
}

.btn-interactive::before {
    content: '';
    position: absolute;
    top: 0;
    left: -100%;
    width: 100%;
    height: 100%;
    background: linear-gradient(90deg, transparent, rgba(255,255,255,0.2), transparent);
    transition: left 0.5s ease;
}

.btn-interactive:hover::before {
    left: 100%;
}

.btn-interactive:hover,
.auth-button:hover,
.send-btn:hover {
    transform: translateY(-2px);
}

/* Animations */
@keyframes float {
    0%, 100% { transform: translate(0, 0) scale(1); }
    50% { transform: translate(30px, -30px) scale(1.1); }
}

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

@keyframes messageSlide {
    from {
        opacity: 0;
        transform: translateY(20px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

@keyframes gradientShift {
    0% { background-position: 0% 50%; }
    50% { background-position: 100% 50%; }
    100% { background-position: 0% 50%; }
}

@keyframes glow {
    0%, 100% { box-shadow: 0 0 20px rgba(59, 130, 246, 0.3); }
    50% { box-shadow: 0 0 30px rgba(59, 130, 246, 0.6); }
}

/* Auth Pages */
.auth-body {
    background: var(--bg-primary);
    min-height: 100vh;
    display: flex;
    align-items: center;
    justify-content: center;
    overflow: hidden;
    position: relative;
}

.auth-body::before,
.auth-body::after {
    content: '';
    position: absolute;
    border-radius: 50%;
    filter: blur(100px);
    opacity: 0.15;
    animation: float 20s ease-in-out infinite;
}

.auth-body::before {
    width: 500px;
    height: 500px;
    background: var(--accent-gradient);
    top: -150px;
    right: -150px;
}

.auth-body::after {
    width: 400px;
    height: 400px;
    background: var(--accent-secondary);
    bottom: -100px;
    left: -100px;
    animation-direction: reverse;
    animation-duration: 15s;
}

.auth-container {
    width: 100%;
    max-width: 420px;
    padding: 20px;
    position: relative;
    z-index: 1;
}

.auth-card {
    border-radius: 24px;
    padding: 48px 40px;
    box-shadow: 0 20px 60px var(--shadow), 0 0 0 1px var(--glass-border) inset;
    transition: all 0.3s ease;
}

.auth-card:hover {
    transform: translateY(-2px);
    box-shadow: 0 24px 70px var(--shadow), 0 0 0 1px var(--glass-border) inset;
}

.auth-header {
    text-align: center;
    margin-bottom: 40px;
}

.auth-header h1 {
    font-size: 2.5em;
    margin-bottom: 12px;
    font-weight: 700;
    letter-spacing: -0.02em;
}

.auth-header p {
    color: var(--text-secondary);
    font-size: 0.95em;
    font-weight: 400;
}

.form-group {
    margin-bottom: 24px;
}

.form-group label {
    display: block;
    margin-bottom: 10px;
    color: var(--text-secondary);
    font-size: 0.9em;
    font-weight: 500;
}

.input-with-icon {
    position: relative;
}

.input-with-icon i {
    position: absolute;
    left: 18px;
    top: 50%;
    transform: translateY(-50%);
    color: var(--text-tertiary);
    transition: color 0.3s ease;
    z-index: 1;
}

.input-with-icon input {
    width: 100%;
    padding: 14px 18px 14px 50px;
    border-radius: 12px;
    color: var(--text-primary);
    font-size: 1em;
    transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
}

.input-with-icon input:focus {
    outline: none;
    border-color: var(--accent-primary);
    background: var(--bg-secondary);
    box-shadow: 0 0 0 4px var(--accent-glow);
    transform: translateY(-1px);
}

.input-with-icon input:focus + i {
    color: var(--accent-primary);
}

.auth-button {
    width: 100%;
    padding: 14px;
    background: var(--accent-gradient);
    border: none;
    border-radius: 12px;
    color: white;
    font-size: 1em;
    font-weight: 600;
    box-shadow: 0 4px 12px var(--shadow-colored);
}

.forgot-password {
    color: var(--text-primary);
    text-decoration: none;
    font-size: 14px;
    transition: color 0.2s ease;
    text-align: center;
}

.forgot-password:hover {
    color: var(--text-secondary);
    text-decoration: underline;
}

.auth-footer {
    text-align: center;
    margin-top: 24px;
    color: var(--text-secondary);
    font-size: 0.9em;
}

.auth-footer a {
    color: var(--accent-primary);
    text-decoration: none;
    font-weight: 600;
    transition: color 0.3s ease;
}

.auth-footer a:hover {
    color: var(--accent-secondary);
}

/* Message Styles */
.error-message,
.success-message {
    border-radius: 12px;
    padding: 14px;
    margin-bottom: 24px;
    font-size: 0.9em;
    backdrop-filter: blur(10px);
}

.error-message {
    background: rgba(239, 68, 68, 0.1);
    border: 1px solid rgba(239, 68, 68, 0.3);
    color: var(--error);
}

.success-message {
    background: rgba(16, 185, 129, 0.1);
    border: 1px solid rgba(16, 185, 129, 0.3);
    color: var(--success);
}

.success-message a {
    color: var(--success);
    text-decoration: underline;
}

/* Main App Layout */
.app-container {
    height: 100vh;
    display: flex;
    flex-direction: column;
    overflow: hidden;
    background: var(--bg-primary);
}

.navbar {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    z-index: 1000;
    border-bottom: 1px solid var(--glass-border);
    padding: 12px 24px;
    display: flex;
    justify-content: space-between;
    align-items: center;
    box-shadow: 0 4px 24px var(--shadow);
}

.nav-left,
.nav-right {
    display: flex;
    align-items: center;
    gap: 16px;
}

.nav-brand {
    font-size: 1.5em;
    font-weight: 700;
    letter-spacing: -0.02em;
}

.user-email {
    color: var(--text-secondary);
    font-size: 0.9em;
    font-weight: 500;
}

.logout-btn,
.auth-link {
    color: var(--error);
    text-decoration: none;
    padding: 8px 16px;
    border-radius: 10px;
    transition: all 0.3s ease;
    font-weight: 600;
}

.auth-link {
    color: var(--accent-primary);
}

.logout-btn:hover {
    background: rgba(239, 68, 68, 0.1);
    transform: translateY(-1px);
}

.auth-link:hover {
    background: rgba(99, 102, 241, 0.1);
    transform: translateY(-1px);
}

/* Sidebar */
.sidebar {
    width: 260px;
    background: var(--bg-secondary);
    border-right: 1px solid var(--glass-border);
    display: flex;
    flex-direction: column;
    transition: transform 0.3s cubic-bezier(0.4, 0, 0.2, 1);
    height: 100%;
    position: relative;
    z-index: 999;
}

.sidebar-header {
    padding: 16px;
    border: 0px solid var(--glass-border);
    display: flex;
    align-items: center;
    gap: 12px;
    min-height: 64px;
}

.new-chat-btn {
    display: flex;
    align-items: center;
    gap: 12px;
    width: 100%;
    padding: 12px 16px;
    background: transparent;
    border-radius: 8px;
    color: var(--text-primary);
    font-size: 0.9em;
    font-weight: 500;
    cursor: pointer;
    transition: all 0.2s ease;
    text-decoration: none;
}

.new-chat-btn:hover {
    background: var(--glass-bg);
    border-color: var(--accent-primary);
}

.new-chat-btn i {
    font-size: 1em;
    color: var(--text-secondary);
}

.chat-history {
    flex: 1;
    overflow-y: auto;
    padding: 8px;
}

.chat-history-header {
    padding: 12px 16px 8px;
    font-size: 0.8em;
    font-weight: 600;
    color: var(--text-tertiary);
    text-transform: uppercase;
    letter-spacing: 0.05em;
    display: flex;
    align-items: center;
    gap: 8px;
}

.chat-history-header i {
    font-size: 0.9em;
}

.chat-history-item {
    display: flex;
    align-items: center;
    gap: 12px;
    padding: 12px 16px;
    border-radius: 8px;
    color: var(--text-secondary);
    text-decoration: none;
    transition: all 0.2s ease;
    margin-bottom: 2px;
    border: 1px solid transparent;
    font-size: 0.9em;
    font-weight: 500;
    position: relative;
}

.chat-history-item:hover {
    background: var(--glass-bg);
    color: var(--text-primary);
}

.chat-history-item.active {
    background: var(--glass-bg);
    color: var(--accent-primary);
    border-color: var(--accent-primary);
}

.chat-history-item.active::before {
    opacity: 1;
}

.chat-history-item span {
    flex: 1;
    white-space: nowrap;
    overflow: hidden;
    text-overflow: ellipsis;
}

.sidebar-footer {
    padding: 16px;
    border-top: 1px solid var(--glass-border);
    display: flex;
    flex-direction: column;
    gap: 8px;
}

.user-info {
    display: flex;
    align-items: center;
    gap: 12px;
    padding: 8px 12px;
    border-radius: 8px;
    transition: all 0.2s ease;
}

.user-info:hover {
    background: var(--glass-bg);
}

.logout-btn-sidebar {
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 8px;
    padding: 12px 16px;
    background: rgba(239, 68, 68, 0.1);
    border: 1px solid rgba(239, 68, 68, 0.3);
    border-radius: 8px;
    color: var(--error);
    text-decoration: none;
    font-size: 0.9em;
    font-weight: 600;
    transition: all 0.2s ease;
}

.logout-btn-sidebar:hover {
    background: rgba(239, 68, 68, 0.2);
    transform: translateY(-1px);
    box-shadow: 0 4px 12px rgba(239, 68, 68, 0.2);
}

.logout-btn-sidebar i {
    font-size: 1em;
}

.user-avatar {
    width: 32px;
    height: 32px;
    border-radius: 6px;
    background: var(--accent-gradient);
    display: flex;
    align-items: center;
    justify-content: center;
    color: white;
    font-size: 0.8em;
    font-weight: 600;
}

.user-details {
    flex: 1;
    min-width: 0;
}

.user-name {
    font-size: 0.9em;
    font-weight: 600;
    color: var(--text-primary);
    white-space: nowrap;
    overflow: hidden;
    text-overflow: ellipsis;
}

/* Chat Area */
.main-content {
    display: flex;
    flex: 1;
    overflow: hidden;
    margin-top: 70px;
    height: calc(100vh - 70px);
}

.chat-area {
    flex: 1;
    display: flex;
    flex-direction: column;
    height: 100%;
    overflow: hidden;
    background: var(--bg-secondary);
}

.messages-container {
    flex: 1;
    overflow-y: auto;
    padding: 32px 24px;
    display: flex;
    flex-direction: column;
    gap: 24px;
    min-height: 0;
}

.input-container {
    padding: 24px;
    border-top: 1px solid var(--glass-border);
    flex-shrink: 0;
}

/* Messages */
.message {
    display: flex;
    gap: 16px;
    max-width: 800px;
    animation: messageSlide 0.4s cubic-bezier(0.4, 0, 0.2, 1);
}

.message.user {
    margin-left: auto;
    flex-direction: row-reverse;
}

.message-avatar {
    width: 42px;
    height: 42px;
    border-radius: 50%;
    background: var(--accent-gradient);
    display: flex;
    align-items: center;
    justify-content: center;
    flex-shrink: 0;
    box-shadow: 0 4px 12px var(--shadow-colored);
    border: 2px solid var(--glass-border);
    color: #eee;
}

.message.user .message-avatar {
    background: var(--glass-bg);
    backdrop-filter: blur(10px);
}

.message.user .message-avatar i {
    color: #333;
}

.message-content {
    padding: 16px 20px;
    border-radius: 16px;
    box-shadow: 0 4px 16px var(--shadow);
    transition: all 0.3s ease;
    position: relative;
}

.message-content:hover {
    box-shadow: 0 6px 20px var(--shadow);
    transform: translateY(-1px);
}

.message.user .message-content {
    background: linear-gradient(135deg, rgba(99, 102, 241, 0.1), rgba(139, 92, 246, 0.1));
    border-color: rgba(99, 102, 241, 0.3);
}

.message.loading .message-content {
    color: var(--text-tertiary);
}

.typing-indicator {
    display: flex;
    align-items: center;
    gap: 6px;
}

.typing-indicator span {
    height: 10px;
    width: 10px;
    background: var(--accent-primary);
    border-radius: 50%;
    animation: typing 1.4s infinite ease-in-out;
    box-shadow: 0 0 8px var(--accent-glow);
}

.typing-indicator span:nth-child(1) { animation-delay: 0s; }
.typing-indicator span:nth-child(2) { animation-delay: 0.2s; }
.typing-indicator span:nth-child(3) { animation-delay: 0.4s; }

/* Input Form */
.message-form {
    max-width: 1200px;
    margin: 0 auto;
}

.input-group {
    display: flex;
    gap: 12px;
    margin-bottom: 12px;
    align-items: flex-end;
}

.input-group textarea {
    flex: 1;
    padding: 16px 24px;
    background: var(--bg-secondary);
    border: 2px solid var(--glass-border);
    border-radius: 24px;
    color: var(--text-primary);
    font-size: 1em;
    transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
    resize: none;
    min-height: 56px;
    max-height: 200px;
    line-height: 1.5;
    overflow-y: auto;
    outline: none;
}

.input-group textarea:focus {
    border-color: var(--accent-primary);
    background: var(--bg-tertiary);
    box-shadow: 0 0 0 4px var(--accent-glow), 0 8px 24px var(--shadow-colored);
    transform: translateY(-2px);
    animation: borderPulse 0.6s ease-out;
}

@keyframes borderPulse {
    0% {
        box-shadow: 0 0 0 0px var(--accent-glow), 0 8px 24px var(--shadow-colored);
    }
    50% {
        box-shadow: 0 0 0 8px var(--accent-glow), 0 8px 24px var(--shadow-colored);
    }
    100% {
        box-shadow: 0 0 0 4px var(--accent-glow), 0 8px 24px var(--shadow-colored);
    }
}

.input-group textarea::placeholder {
    color: var(--text-tertiary);
}

.send-btn {
    background: var(--accent-gradient);
    border: none;
    border-radius: 50%;
    width: 56px;
    height: 56px;
    color: white;
    cursor: pointer;
    display: flex;
    align-items: center;
    justify-content: center;
    box-shadow: 0 4px 12px var(--shadow-colored);
    flex-shrink: 0;
    margin-bottom: 0;
}

.send-btn:hover {
    transform: translateY(-2px) scale(1.05);
    box-shadow: 0 8px 20px var(--shadow-colored);
}

.send-btn:active {
    transform: translateY(0) scale(0.95);
}

.disclaimer {
    text-align: center;
    color: var(--text-tertiary);
    font-size: 0.85em;
    margin-top: 12px;
}

/* Enhanced UX Elements */
.external-link {
    display: inline-flex;
    align-items: center;
    gap: 4px;
    color: var(--accent-primary);
    text-decoration: none;
    transition: all 0.2s ease;
    word-break: break-word;
}

.external-link:hover {
    color: var(--accent-secondary);
    text-decoration: underline;
}

.external-icon {
    font-size: 0.8em;
    margin-left: 4px;
    flex-shrink: 0;
    opacity: 0.7;
    transition: all 0.2s ease;
}

.external-link:hover .external-icon {
    opacity: 1;
    transform: translateX(2px) translateY(-2px);
}

.copy-code-btn,
.copy-response-btn {
    display: flex;
    align-items: center;
    gap: 6px;
    padding: 6px 12px;
    border-radius: 6px;
    font-size: 0.85em;
    cursor: pointer;
    transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1) !important;
    font-family: inherit;
    color: var(--text-primary);
}

.copy-code-btn {
    position: absolute;
    top: 8px;
    right: 8px;
}

.copy-response-btn {
    position: absolute;
    top: 8px;
    right: 8px;
    width: 32px;
    height: 32px;
    justify-content: center;
    color: var(--text-secondary);
    opacity: 0;
}

.message.assistant .message-content:hover .copy-response-btn {
    opacity: 1;
}

.copy-code-btn:hover,
.copy-response-btn:hover {
    background: var(--bg-tertiary);
    transform: translateY(-1px);
}

.copy-code-btn.copying,
.copy-response-btn.copying {
    opacity: 0.7;
    transform: scale(0.95);
}

.copy-code-btn.copied,
.copy-response-btn.copied {
    background: rgba(16, 185, 129, 0.2);
    border-color: rgba(16, 185, 129, 0.4);
    color: var(--success);
    transform: scale(1.05);
    box-shadow: 0 4px 12px var(--accent-glow);
    opacity: 1;
}

.copy-code-btn i,
.copy-response-btn i {
    transition: all 0.3s ease;
}

.copy-code-btn.copied i,
.copy-response-btn.copied i {
    transform: scale(1.2);
}

.copy-code-btn svg,
.copy-response-btn svg {
    width: 16px;
    height: 16px;
}

/* Theme Toggle */
.theme-toggle {
    margin-left: 16px;
    display: flex;
    align-items: center;
}

.theme-toggle-btn {
    display: flex;
    align-items: center;
    justify-content: center;
    width: 40px;
    height: 40px;
    border-radius: 12px;
    color: var(--text-secondary);
    cursor: pointer;
    transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
    font-size: 1.1rem;
}

.theme-toggle-btn:hover {
    background: var(--bg-tertiary);
    color: var(--text-primary);
    transform: scale(1.05);
    box-shadow: 0 4px 12px var(--shadow);
}

.theme-toggle-btn .fa-sun,
.theme-toggle-btn .fa-moon {
    position: absolute;
}

.theme-toggle-btn .fa-sun {
    display: none;
}

.theme-toggle-btn .fa-moon {
    display: block;
}

[data-theme="light"] .theme-toggle-btn .fa-sun {
    display: block;
}

[data-theme="light"] .theme-toggle-btn .fa-moon {
    display: none;
}

/* Sidebar Toggle */
.sidebar-toggle {
    color: var(--text-primary);
    font-size: 1.2em;
    cursor: pointer;
    padding: 10px;
    border-radius: 12px;
    transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
    display: none !important;
}

.sidebar-toggle:hover {
    background: var(--bg-tertiary);
    transform: scale(1.05);
    box-shadow: 0 4px 12px var(--shadow);
}

/* Welcome Message */
.welcome-message {
    text-align: center;
    padding: 3rem 2rem;
    color: var(--text-tertiary);
    background: rgba(255, 255, 255, 0.05);
    backdrop-filter: blur(20px);
    border-radius: 44px;
    border: 1px solid rgba(255, 255, 255, 0.1);
    margin: 2rem;
    animation: 1s ease-in-out;
}

.welcome-logo {
    width: 120px;
    height: 120px;
    margin: 0 auto 2rem;
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    animation: glow 3s ease-in-out infinite;
    border: 4px solid rgba(255, 255, 255, 0.2);
}

.welcome-logo img {
    width: 80px;
    height: 80px;
    filter: brightness(0) invert(1);
}

.welcome-message h2 {
    font-size: 3rem;
    font-weight: 700;
    background: linear-gradient(135deg, #fff 0%, #a5b4fc 100%);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
    margin-bottom: 1rem;
    font-family: 'National Park', sans-serif;
}

.welcome-message p {
    font-size: 1.4rem;
    margin-bottom: 0;
    font-weight: 300;
}

.no-chats-message {
    text-align: center;
    color: #94a3b8;
    font-style: italic;
    padding: 2rem 1rem;
    background: rgba(255, 255, 255, 0.05);
    border-radius: 12px;
    border: 1px dashed rgba(255, 255, 255, 0.2);
}

/* Scrollbar Styling */
::-webkit-scrollbar,
.input-group textarea::-webkit-scrollbar {
    width: 8px;
    height: 8px;
}

.input-group textarea::-webkit-scrollbar {
    width: 6px;
}

/* Hide sidebar scrollbar completely */
.chat-history {
    flex: 1;
    overflow-y: auto;
    padding: 8px;
    scrollbar-width: none; /* Firefox */
    -ms-overflow-style: none; /* IE and Edge */
}

.chat-history::-webkit-scrollbar {
    display: none !important; /* Chrome, Safari, Opera */
    width: 0 !important;
    height: 0 !important;
}

::-webkit-scrollbar-track {
    background: var(--glass-bg);
}

.input-group textarea::-webkit-scrollbar-track {
    background: transparent;
    border-radius: 3px;
}

::-webkit-scrollbar-thumb,
.input-group textarea::-webkit-scrollbar-thumb {
    background: var(--glass-border);
    border-radius: 4px;
    transition: background 0.3s ease;
}

.input-group textarea::-webkit-scrollbar-thumb {
    border-radius: 3px;
}

::-webkit-scrollbar-thumb:hover,
.input-group textarea::-webkit-scrollbar-thumb:hover {
    background: var(--text-tertiary);
}

/* Light Theme Overrides */
[data-theme="light"] .app-container {
    background: var(--gradient-light);
    background-size: 400% 400%;
    animation: gradientShift 15s ease infinite;
}

[data-theme="light"] .navbar,
[data-theme="light"] .sidebar,
[data-theme="light"] .message-content,
[data-theme="light"] .sidebar-toggle,
[data-theme="light"] .theme-toggle-btn {
    background: rgba(255, 255, 255, 0.9);
    border-color: rgba(0, 0, 0, 0.1);
}

[data-theme="light"] .input-group textarea,
[data-theme="light"] .input-group input {
    background: rgba(255, 255, 255, 0.9);
    border-color: rgba(0, 0, 0, 0.1);
}

[data-theme="light"] .input-group textarea:focus,
[data-theme="light"] .input-group input:focus {
    background: rgba(255, 255, 255, 0.95);
}

[data-theme="light"] .chat-history-item:hover,
[data-theme="light"] .user-info:hover {
    background: rgba(0, 0, 0, 0.05);
}

[data-theme="light"] .sidebar-toggle:hover,
[data-theme="light"] .theme-toggle-btn:hover {
    background: rgba(0, 0, 0, 0.05);
}

[data-theme="light"] .chat-history-item.active {
    background: rgba(99, 102, 241, 0.1);
}

[data-theme="light"] .welcome-message {
    background: transparent;
    border-radius: 44px;
    border: 1px solid rgba(255, 255, 255, 0.1);
}

[data-theme="light"] .welcome-logo {
    background: var(--accent-gradient);
    border: 2px solid var(--glass-border);
    box-shadow: 0 8px 32px var(--shadow-colored);
}

[data-theme="light"] .welcome-message h2 {
    background: var(--accent-gradient);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

[data-theme="light"] .welcome-message p {
    color: var(--text-tertiary);
}

[data-theme="light"] .no-chats-message {
    color: var(--text-tertiary);
    background: var(--glass-bg);
    border: 1px dashed var(--glass-border);
}

[data-theme="light"] .theme-toggle-btn {
    background: rgba(255, 255, 255, 0.8);
    border: 1px solid rgba(0, 0, 0, 0.1);
    color: var(--text-secondary);
}

[data-theme="light"] .theme-toggle-btn:hover {
    background: rgba(0, 0, 0, 0.05);
    color: var(--text-primary);
}

[data-theme="light"] .sidebar {
    background: var(--bg-secondary);
}

[data-theme="light"] ::-webkit-scrollbar-track {
    background: rgba(0, 0, 0, 0.05);
}

[data-theme="light"] ::-webkit-scrollbar-thumb {
    background: rgba(0, 0, 0, 0.2);
}

[data-theme="light"] ::-webkit-scrollbar-thumb:hover {
    background: rgba(0, 0, 0, 0.4);
}

/* Responsive Design - Mobile */
@media (max-width: 768px) {
    .sidebar-toggle {
        display: flex !important;
        align-items: center;
        justify-content: center;
    }
    
    .sidebar {
        position: fixed;
        top: 70px;
        left: 0;
        height: calc(100vh - 70px);
        transform: translateX(-100%);
        z-index: 1000;
        width: 280px;
    }
    
    .sidebar.active {
        transform: translateX(0);
    }
    
    .sidebar-close {
        display: flex !important;
    }
    
    .message,
    .message-content {
        max-width: 95%;
    }
    
    .nav-brand {
        font-size: 1.2em;
    }
    
    .user-email {
        display: none;
    }
    
    .input-group {
        flex-direction: column;
        gap: 12px;
        align-items: stretch;
    }
    
    .input-group textarea {
        padding: 14px 20px;
        font-size: 16px;
        min-height: 52px;
        max-height: 150px;
        border-radius: 20px;
        line-height: 1.4;
    }
    
    .input-group textarea::placeholder {
        font-size: 0.95em;
    }
    
    .input-group textarea::-webkit-scrollbar {
        width: 4px;
    }
    
    .send-btn {
        width: 100%;
        border-radius: 20px;
        height: 52px;
        min-height: 52px;
    }
    
    .send-btn:active {
        transform: scale(0.98);
    }
    
    .input-container {
        padding: 20px 16px;
    }
    
    .messages-container {
        padding: 24px 16px;
        gap: 20px;
    }
    
    .disclaimer {
        font-size: 0.8em;
        margin-top: 10px;
        padding: 0 8px;
    }
    
    .auth-card {
        padding: 36px 28px;
    }
    
    .welcome-message {
        padding: 1.5rem 1rem;
        min-height: 250px;
    }
    
    .welcome-message h2 {
        font-size: 1.5rem;
    }
    
    .welcome-message p {
        font-size: 0.9rem;
    }
    
    .welcome-logo {
        width: 64px;
        height: 64px;
        margin-bottom: 1.25rem;
    }
    
    .welcome-logo img {
        width: 40px;
        height: 40px;
    }
}

/* Extra Small Mobile */
@media (max-width: 480px) {
    .input-group textarea {
        padding: 12px 16px;
        min-height: 48px;
        max-height: 120px;
        border-radius: 18px;
        font-size: 16px;
    }

    .send-btn {
        height: 48px;
        min-height: 48px;
        border-radius: 18px;
    }

    .input-container {
        padding: 16px 12px;
    }

    .messages-container {
        padding: 20px 12px;
        gap: 16px;
    }

    .input-group {
        gap: 10px;
    }
}

/* Tablet */
@media (min-width: 769px) and (max-width: 1024px) {
    .input-group textarea {
        padding: 15px 22px;
        min-height: 54px;
        max-height: 180px;
    }

    .send-btn {
        width: 54px;
        height: 54px;
    }

    .input-container {
        padding: 22px 20px;
    }
}

/* Desktop - Hide mobile controls */
@media (min-width: 769px) {
    .sidebar-toggle,
    .sidebar-close {
        display: none !important;
    }
    
    .sidebar {
        transform: translateX(0) !important;
        position: relative;
        top: 0;
    }
}