:root {
    /* Lobe UI - Colores Base (Modo Oscuro Glassmorphism) */
    --bg-primary: #0a0a0a;                    /* Dark base */
    --bg-secondary: #111111;                  /* Secondary dark */
    --bg-tertiary: rgba(255, 255, 255, 0.03); /* Subtle overlay */
    --bg-elevated: rgba(255, 255, 255, 0.05); /* Elevated surface */
    --bg-hover: rgba(255, 255, 255, 0.08);    /* Hover state */
    --bg-active: rgba(255, 255, 255, 0.12);   /* Active state */

    /* Lobe UI - Glassmorphism Effects */
    --glass-bg: rgba(17, 17, 17, 0.7);        /* Glass background */
    --glass-border: rgba(255, 255, 255, 0.08);/* Glass border */
    --blur-amount: 20px;                       /* Backdrop blur */

    /* Lobe UI - Colores de Texto */
    --text-primary: #ffffff;                   /* Pure white */
    --text-secondary: rgba(255, 255, 255, 0.7);/* Secondary text */
    --text-tertiary: rgba(255, 255, 255, 0.45);/* Tertiary text */
    --text-quaternary: rgba(255, 255, 255, 0.25);/* Disabled text */

    /* Lobe UI - Gradientes Vibrantes */
    --gradient-primary: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    --gradient-secondary: linear-gradient(135deg, #f093fb 0%, #f5576c 100%);
    --gradient-accent: linear-gradient(135deg, #4facfe 0%, #00f2fe 100%);
    --gradient-success: linear-gradient(135deg, #43e97b 0%, #38f9d7 100%);
    --gradient-warning: linear-gradient(135deg, #fa709a 0%, #fee140 100%);

    /* Lobe UI - Colores de Acento */
    --accent-primary: #667eea;                 /* Purple primary */
    --accent-secondary: #764ba2;               /* Purple dark */
    --accent-hover: #7d8ff5;                   /* Lighter purple */
    --accent-active: #5568d3;                  /* Darker purple */
    --accent-light: rgba(102, 126, 234, 0.15); /* Light purple bg */

    /* Lobe UI - Colores Semánticos */
    --color-success: #43e97b;
    --color-warning: #ffd93d;
    --color-error: #ff6b9d;
    --color-info: #4facfe;

    /* Lobe UI - Mensajes */
    --message-user-bg: rgba(102, 126, 234, 0.1); /* Purple tint */
    --message-ai-bg: rgba(255, 255, 255, 0.03);  /* Subtle bg */
    --message-hover-bg: rgba(255, 255, 255, 0.05);

    /* Lobe UI - Bordes */
    --border-primary: rgba(255, 255, 255, 0.08);
    --border-secondary: rgba(255, 255, 255, 0.05);
    --border-focus: rgba(102, 126, 234, 0.4);

    /* Lobe UI - Sombras (más pronunciadas) */
    --shadow-xs: 0 1px 2px rgba(0, 0, 0, 0.2);
    --shadow-sm: 0 2px 8px rgba(0, 0, 0, 0.3);
    --shadow-md: 0 4px 16px rgba(0, 0, 0, 0.4);
    --shadow-lg: 0 8px 32px rgba(0, 0, 0, 0.5);
    --shadow-xl: 0 16px 48px rgba(0, 0, 0, 0.6);
    --shadow-glow: 0 0 20px rgba(102, 126, 234, 0.3);
    --shadow-focus: 0 0 0 4px rgba(102, 126, 234, 0.2);

    /* Lobe UI - Transiciones Suaves */
    --transition-fast: 150ms cubic-bezier(0.4, 0, 0.2, 1);
    --transition-base: 250ms cubic-bezier(0.4, 0, 0.2, 1);
    --transition-slow: 350ms cubic-bezier(0.4, 0, 0.2, 1);
    --transition-bounce: 400ms cubic-bezier(0.68, -0.55, 0.265, 1.55);

    /* Lobe UI - Bordes Redondeados */
    --radius-xs: 6px;
    --radius-sm: 8px;
    --radius-md: 12px;
    --radius-lg: 16px;
    --radius-xl: 20px;
    --radius-2xl: 24px;
    --radius-3xl: 32px;
    --radius-full: 9999px;

    /* Lobe UI - Espaciado */
    --spacing-xs: 4px;
    --spacing-sm: 8px;
    --spacing-md: 12px;
    --spacing-lg: 16px;
    --spacing-xl: 20px;
    --spacing-2xl: 24px;
    --spacing-3xl: 32px;
    --spacing-4xl: 48px;

    /* Lobe UI - Tipografía */
    --font-mono: 'JetBrains Mono', 'Fira Code', 'Consolas', monospace;
}

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

body {
    font-family: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', 'Roboto', sans-serif;
    background: var(--bg-primary);
    background-image:
        radial-gradient(circle at 20% 50%, rgba(102, 126, 234, 0.08) 0%, transparent 50%),
        radial-gradient(circle at 80% 80%, rgba(118, 75, 162, 0.08) 0%, transparent 50%),
        radial-gradient(circle at 40% 20%, rgba(79, 172, 254, 0.06) 0%, transparent 50%);
    background-attachment: fixed;
    color: var(--text-primary);
    height: 100vh;
    overflow: hidden;
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
}

.app-container {
    display: flex;
    height: 100vh;
    position: relative;
}

/* ==================== Sidebar - Lobe UI Style ==================== */
.sidebar {
    width: 280px;
    background: var(--glass-bg);
    backdrop-filter: blur(var(--blur-amount));
    -webkit-backdrop-filter: blur(var(--blur-amount));
    border-right: 1px solid var(--glass-border);
    display: flex;
    flex-direction: column;
    transition: transform var(--transition-base);
    position: relative;
    z-index: 1000;
    box-shadow: var(--shadow-lg);
}

.sidebar-header {
    padding: var(--spacing-lg);
    display: flex;
    gap: var(--spacing-sm);
    align-items: center;
    border-bottom: 1px solid var(--border-secondary);
}

.sidebar-toggle {
    width: 40px;
    height: 40px;
    background: var(--bg-elevated);
    border: 1px solid var(--border-primary);
    border-radius: var(--radius-md);
    color: var(--text-secondary);
    display: flex;
    align-items: center;
    justify-content: center;
    cursor: pointer;
    transition: all var(--transition-fast);
}

.sidebar-toggle:hover {
    background: var(--bg-hover);
    color: var(--text-primary);
    border-color: var(--border-primary);
    transform: scale(1.05);
}

.new-chat-btn {
    flex: 1;
    padding: var(--spacing-md);
    background: var(--gradient-primary);
    border: none;
    border-radius: var(--radius-lg);
    color: white;
    font-size: 14px;
    font-weight: 600;
    display: flex;
    align-items: center;
    justify-content: center;
    gap: var(--spacing-sm);
    cursor: pointer;
    transition: all var(--transition-fast);
    box-shadow: var(--shadow-md);
    position: relative;
    overflow: hidden;
}

.new-chat-btn::before {
    content: '';
    position: absolute;
    inset: 0;
    background: linear-gradient(135deg, rgba(255,255,255,0.2) 0%, transparent 100%);
    opacity: 0;
    transition: opacity var(--transition-fast);
}

.new-chat-btn:hover::before {
    opacity: 1;
}

.new-chat-btn:hover {
    transform: translateY(-2px);
    box-shadow: var(--shadow-lg), var(--shadow-glow);
}

.new-chat-btn:active {
    transform: translateY(0);
}

/* Chat History - Lobe UI Style */
.chat-history {
    flex: 1;
    overflow-y: auto;
    overflow-x: hidden;
    padding: var(--spacing-sm);
}

.chat-history::-webkit-scrollbar {
    width: 4px;
}

.chat-history::-webkit-scrollbar-track {
    background: transparent;
}

.chat-history::-webkit-scrollbar-thumb {
    background: var(--border-primary);
    border-radius: var(--radius-full);
}

.chat-history::-webkit-scrollbar-thumb:hover {
    background: var(--border-focus);
}

.chat-history-section {
    margin-bottom: var(--spacing-lg);
}

.section-title {
    font-size: 11px;
    font-weight: 700;
    color: var(--text-tertiary);
    padding: var(--spacing-sm) var(--spacing-md);
    text-transform: uppercase;
    letter-spacing: 1px;
}

.chat-item {
    display: flex;
    align-items: center;
    gap: var(--spacing-md);
    padding: var(--spacing-md);
    border-radius: var(--radius-lg);
    cursor: pointer;
    color: var(--text-secondary);
    font-size: 14px;
    transition: all var(--transition-fast);
    position: relative;
    margin-bottom: var(--spacing-xs);
    background: transparent;
    border: 1px solid transparent;
}

.chat-item::before {
    content: '';
    position: absolute;
    inset: 0;
    border-radius: var(--radius-lg);
    background: var(--bg-elevated);
    opacity: 0;
    transition: opacity var(--transition-fast);
    z-index: -1;
}

.chat-item:hover::before {
    opacity: 1;
}

.chat-item:hover {
    color: var(--text-primary);
    border-color: var(--border-primary);
    transform: translateX(4px);
}

.chat-item.active {
    background: var(--accent-light);
    color: var(--text-primary);
    border-color: var(--border-focus);
}

.chat-item.active::before {
    opacity: 0;
}

.chat-item svg {
    flex-shrink: 0;
    opacity: 0.7;
}

.chat-item:hover svg,
.chat-item.active svg {
    opacity: 1;
}

.chat-item-title {
    flex: 1;
    overflow: hidden;
    text-overflow: ellipsis;
    white-space: nowrap;
    font-weight: 500;
}

.chat-item-actions {
    opacity: 0;
    display: flex;
    gap: var(--spacing-xs);
    transition: opacity var(--transition-fast);
}

.chat-item:hover .chat-item-actions {
    opacity: 1;
}

.chat-item-btn {
    width: 28px;
    height: 28px;
    background: var(--bg-elevated);
    border: 1px solid var(--border-primary);
    border-radius: var(--radius-sm);
    color: var(--text-secondary);
    display: flex;
    align-items: center;
    justify-content: center;
    cursor: pointer;
    transition: all var(--transition-fast);
}

.chat-item-btn:hover {
    background: var(--bg-hover);
    color: var(--text-primary);
    border-color: var(--border-focus);
}

/* Sidebar Footer - Lobe UI Style */
.sidebar-footer {
    padding: var(--spacing-lg);
    border-top: 1px solid var(--border-secondary);
    background: var(--bg-elevated);
}

.user-profile {
    width: 100%;
    display: flex;
    align-items: center;
    gap: var(--spacing-md);
    padding: var(--spacing-md);
    background: transparent;
    border: 1px solid var(--border-primary);
    border-radius: var(--radius-lg);
    cursor: pointer;
    transition: all var(--transition-fast);
    color: var(--text-primary);
}

.user-profile:hover {
    background: var(--bg-hover);
    border-color: var(--border-focus);
    transform: translateY(-2px);
    box-shadow: var(--shadow-md);
}

.avatar {
    width: 36px;
    height: 36px;
    background: var(--gradient-primary);
    border-radius: var(--radius-md);
    display: flex;
    align-items: center;
    justify-content: center;
    color: white;
    font-weight: 700;
    font-size: 14px;
    flex-shrink: 0;
    box-shadow: var(--shadow-sm);
}

.user-info {
    flex: 1;
    display: flex;
    flex-direction: column;
    align-items: flex-start;
}

.user-name {
    font-size: 14px;
    font-weight: 600;
}

.user-plan {
    font-size: 12px;
    color: var(--text-tertiary);
}

.user-chevron {
    color: var(--text-secondary);
    flex-shrink: 0;
    transition: transform var(--transition-fast);
}

.user-profile:hover .user-chevron {
    transform: translateY(2px);
}

/* ==================== Main Chat Area - Lobe UI Style ==================== */
.chat-container {
    flex: 1;
    display: flex;
    flex-direction: column;
    background: var(--bg-secondary);
    overflow: hidden;
    position: relative;
}

.mobile-header {
    display: none;
    align-items: center;
    justify-content: space-between;
    padding: var(--spacing-md) var(--spacing-lg);
    background: var(--bg-primary);
    border-bottom: 1px solid var(--border-color);
}

.mobile-menu-btn,
.new-chat-btn-mobile {
    width: 40px;
    height: 40px;
    background: transparent;
    border: none;
    border-radius: var(--radius-md);
    color: var(--text-primary);
    display: flex;
    align-items: center;
    justify-content: center;
    cursor: pointer;
    transition: all var(--transition-fast);
}

.mobile-menu-btn:hover,
.new-chat-btn-mobile:hover {
    background: var(--bg-hover);
}

.mobile-title {
    font-size: 18px;
    font-weight: 600;
}

.chat-content {
    flex: 1;
    display: flex;
    flex-direction: column;
    overflow: hidden;
}

.messages-wrapper {
    flex: 1;
    overflow-y: auto;
    overflow-x: hidden;
}

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

.messages-wrapper::-webkit-scrollbar-track {
    background: transparent;
}

.messages-wrapper::-webkit-scrollbar-thumb {
    background: var(--border-color);
    border-radius: var(--radius-full);
}

.messages-wrapper::-webkit-scrollbar-thumb:hover {
    background: var(--border-light);
}

.messages-container {
    max-width: 48rem;  /* Mismo ancho que ChatGPT */
    margin: 0 auto;
    padding: var(--spacing-2xl) var(--spacing-lg);
    width: 100%;
}

/* Welcome Message - Lobe UI Gradient Style */
.welcome-message {
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    padding: var(--spacing-4xl) var(--spacing-lg);
    min-height: 60vh;
}

.logo-wrapper {
    margin-bottom: var(--spacing-3xl);
    position: relative;
}

.logo {
    width: 64px;
    height: 64px;
    background: var(--gradient-primary);
    border-radius: var(--radius-xl);
    display: flex;
    align-items: center;
    justify-content: center;
    color: white;
    box-shadow: var(--shadow-lg), var(--shadow-glow);
    animation: pulse 3s ease-in-out infinite;
}

@keyframes pulse {
    0%, 100% {
        transform: scale(1);
        box-shadow: var(--shadow-lg), var(--shadow-glow);
    }
    50% {
        transform: scale(1.05);
        box-shadow: var(--shadow-xl), 0 0 30px rgba(102, 126, 234, 0.5);
    }
}

.welcome-message h2 {
    font-size: 36px;
    font-weight: 700;
    margin-bottom: var(--spacing-md);
    text-align: center;
    color: var(--text-primary);
    background: var(--gradient-primary);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

/* Suggestion Cards - Lobe UI Glassmorphism Style */
.suggestion-cards {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(260px, 1fr));
    gap: var(--spacing-lg);
    width: 100%;
    max-width: 52rem;
    margin-top: var(--spacing-4xl);
}

.suggestion-card {
    background: var(--glass-bg);
    backdrop-filter: blur(12px);
    -webkit-backdrop-filter: blur(12px);
    border: 1px solid var(--glass-border);
    border-radius: var(--radius-xl);
    padding: var(--spacing-xl);
    cursor: pointer;
    transition: all var(--transition-base);
    display: flex;
    flex-direction: column;
    align-items: flex-start;
    gap: var(--spacing-md);
    text-align: left;
    position: relative;
    overflow: hidden;
}

.suggestion-card::before {
    content: '';
    position: absolute;
    inset: 0;
    background: var(--gradient-primary);
    opacity: 0;
    transition: opacity var(--transition-base);
    z-index: -1;
}

.suggestion-card:hover::before {
    opacity: 0.08;
}

.suggestion-card:hover {
    background: var(--bg-elevated);
    border-color: var(--border-focus);
    transform: translateY(-4px);
    box-shadow: var(--shadow-lg), var(--shadow-glow);
}

.suggestion-card:active {
    transform: translateY(-2px);
}

.suggestion-icon {
    font-size: 24px;
    line-height: 1;
    filter: drop-shadow(0 2px 8px rgba(0, 0, 0, 0.3));
}

.suggestion-content {
    display: flex;
    flex-direction: column;
    gap: var(--spacing-xs);
}

.suggestion-content h3 {
    font-size: 15px;
    font-weight: 600;
    color: var(--text-primary);
    line-height: 1.4;
}

.suggestion-content p {
    font-size: 13px;
    color: var(--text-secondary);
    line-height: 1.5;
}

/* Message Bubbles - Lobe UI Glassmorphism Style */
.message {
    display: flex;
    gap: var(--spacing-2xl);
    padding: var(--spacing-2xl) 0;
    animation: fadeIn 0.4s cubic-bezier(0.4, 0, 0.2, 1);
    border-bottom: 1px solid var(--border-secondary);
}

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

/* Usuario - estilo Lobe UI con glassmorphism */
.message.user {
    background: var(--message-user-bg);
    backdrop-filter: blur(8px);
    -webkit-backdrop-filter: blur(8px);
    margin: 0 calc(var(--spacing-2xl) * -1);
    padding: var(--spacing-2xl) var(--spacing-2xl);
    border-left: 2px solid var(--accent-primary);
}

/* AI - estilo Lobe UI sutil */
.message.ai {
    background: var(--message-ai-bg);
    margin: 0 calc(var(--spacing-2xl) * -1);
    padding: var(--spacing-2xl) var(--spacing-2xl);
}

.message:hover {
    background: var(--message-hover-bg);
}

.message-avatar {
    width: 36px;
    height: 36px;
    border-radius: var(--radius-lg);
    display: flex;
    align-items: center;
    justify-content: center;
    flex-shrink: 0;
    font-weight: 600;
    font-size: 14px;
    position: relative;
    box-shadow: var(--shadow-md);
}

/* Avatar del usuario - gradiente purple de Lobe UI */
.message.user .message-avatar {
    background: var(--gradient-primary);
    color: white;
}

/* Avatar de AI - gradiente cyan de Lobe UI */
.message.ai .message-avatar {
    background: var(--gradient-accent);
    color: white;
}

.message-content {
    flex: 1;
    min-width: 0;
    max-width: 52rem;
}

.message-text {
    font-size: 15px;
    line-height: 1.75;
    color: var(--text-primary);
    word-wrap: break-word;
}

.message-text p {
    margin-bottom: var(--spacing-lg);
}

.message-text p:last-child {
    margin-bottom: 0;
}

.message-text code {
    background: var(--bg-elevated);
    color: var(--accent-primary);
    padding: 3px 8px;
    border-radius: var(--radius-sm);
    font-family: var(--font-mono);
    font-size: 0.9em;
    border: 1px solid var(--border-primary);
}

.message-text pre {
    background: var(--bg-elevated);
    padding: var(--spacing-lg);
    border-radius: var(--radius-lg);
    overflow-x: auto;
    margin: var(--spacing-lg) 0;
    border: 1px solid var(--border-primary);
    box-shadow: var(--shadow-sm);
}

.message-text pre code {
    background: none;
    padding: 0;
    color: var(--text-primary);
    border: none;
}

/* Acciones del mensaje (hover) - Lobe UI style */
.message-actions {
    display: flex;
    gap: var(--spacing-xs);
    opacity: 0;
    transition: opacity var(--transition-fast);
    margin-top: var(--spacing-md);
}

.message:hover .message-actions {
    opacity: 1;
}

.message-action-btn {
    padding: var(--spacing-xs) var(--spacing-md);
    background: var(--bg-elevated);
    border: 1px solid var(--border-primary);
    border-radius: var(--radius-md);
    color: var(--text-secondary);
    font-size: 12px;
    cursor: pointer;
    transition: all var(--transition-fast);
    display: flex;
    align-items: center;
    gap: var(--spacing-xs);
    font-weight: 500;
}

.message-action-btn:hover {
    background: var(--bg-hover);
    color: var(--text-primary);
    border-color: var(--border-focus);
    transform: translateY(-1px);
}
    font-size: 0.9em;
}

.message-text pre {
    background: var(--bg-primary);
    padding: var(--spacing-lg);
    border-radius: var(--radius-md);
    overflow-x: auto;
    margin: var(--spacing-md) 0;
}

.message-text pre code {
    background: none;
    padding: 0;
}

/* Typing Indicator */
.typing-indicator {
    display: flex;
    gap: var(--spacing-lg);
    padding: var(--spacing-xl) 0;
}

.typing-dots {
    display: flex;
    gap: 6px;
    padding: var(--spacing-md) 0;
}

.typing-dot {
    width: 8px;
    height: 8px;
    background: var(--text-tertiary);
    border-radius: var(--radius-full);
    animation: typing 1.4s infinite;
}

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

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

@keyframes typing {
    0%, 60%, 100% {
        transform: translateY(0);
        opacity: 0.5;
    }
    30% {
        transform: translateY(-10px);
        opacity: 1;
    }
}

/* ==================== Input Area - Lobe UI Glassmorphism Style ==================== */
.input-area {
    padding: var(--spacing-2xl) var(--spacing-lg);
    background: var(--glass-bg);
    backdrop-filter: blur(var(--blur-amount));
    -webkit-backdrop-filter: blur(var(--blur-amount));
    border-top: 1px solid var(--border-primary);
    box-shadow: var(--shadow-xl);
}

.input-container {
    max-width: 52rem;
    margin: 0 auto;
    width: 100%;
}

.input-form {
    position: relative;
}

.input-wrapper {
    display: flex;
    align-items: flex-end;
    gap: var(--spacing-sm);
    background: var(--bg-elevated);
    border: 1px solid var(--border-primary);
    border-radius: var(--radius-2xl);
    padding: var(--spacing-md);
    transition: all var(--transition-base);
    box-shadow: var(--shadow-md);
}

.input-wrapper:focus-within {
    border-color: var(--border-focus);
    box-shadow: var(--shadow-focus), var(--shadow-glow);
    background: var(--bg-hover);
}

.attach-btn {
    width: 36px;
    height: 36px;
    background: var(--bg-elevated);
    border: 1px solid var(--border-primary);
    border-radius: var(--radius-md);
    color: var(--text-secondary);
    display: flex;
    align-items: center;
    justify-content: center;
    cursor: pointer;
    transition: all var(--transition-fast);
    flex-shrink: 0;
}

.attach-btn:hover {
    background: var(--bg-hover);
    color: var(--text-primary);
    border-color: var(--border-focus);
    transform: scale(1.05);
}

.message-input {
    flex: 1;
    background: transparent;
    border: none;
    color: var(--text-primary);
    font-size: 15px;
    font-family: inherit;
    resize: none;
    outline: none;
    max-height: 200px;
    line-height: 1.5;
    padding: var(--spacing-sm) var(--spacing-md);
}

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

.send-btn {
    width: 36px;
    height: 36px;
    background: var(--bg-elevated);
    border: 1px solid var(--border-primary);
    border-radius: var(--radius-md);
    color: var(--text-tertiary);
    display: flex;
    align-items: center;
    justify-content: center;
    cursor: pointer;
    transition: all var(--transition-base);
    flex-shrink: 0;
    position: relative;
    overflow: hidden;
}

.send-btn::before {
    content: '';
    position: absolute;
    inset: 0;
    background: var(--gradient-primary);
    opacity: 0;
    transition: opacity var(--transition-fast);
}

/* Cuando hay texto, el botón se activa con gradiente */
.send-btn:not(:disabled) {
    background: var(--gradient-primary);
    color: white;
    border: none;
    box-shadow: var(--shadow-md), var(--shadow-glow);
}

.send-btn:not(:disabled)::before {
    opacity: 0;
}

.send-btn:hover:not(:disabled) {
    transform: scale(1.08);
    box-shadow: var(--shadow-lg), var(--shadow-glow);
}

.send-btn:hover:not(:disabled)::before {
    opacity: 0.2;
}

.send-btn:active:not(:disabled) {
    transform: scale(0.95);
}

.send-btn:disabled {
    background: var(--bg-elevated);
    color: var(--text-quaternary);
    cursor: not-allowed;
    opacity: 0.5;
}

.input-disclaimer {
    font-size: 12px;
    color: var(--text-tertiary);
    text-align: center;
    margin-top: var(--spacing-lg);
    line-height: 1.5;
    padding: 0 var(--spacing-md);
}

/* ==================== Responsive Design ==================== */
@media (max-width: 768px) {
    .sidebar {
        position: fixed;
        left: 0;
        top: 0;
        bottom: 0;
        transform: translateX(-100%);
        z-index: 2000;
        width: 280px;
        box-shadow: var(--shadow-lg);
    }

    .sidebar.open {
        transform: translateX(0);
    }

    .mobile-header {
        display: flex;
    }

    .messages-container {
        padding: var(--spacing-lg) var(--spacing-md);
    }

    .input-area {
        padding: var(--spacing-md);
    }

    .suggestion-cards {
        grid-template-columns: 1fr;
        gap: var(--spacing-sm);
    }

    .welcome-message h2 {
        font-size: 24px;
    }

    .message {
        gap: var(--spacing-md);
        padding: var(--spacing-lg) 0;
    }

    .message.user {
        margin: 0 calc(var(--spacing-md) * -1);
        padding: var(--spacing-lg) var(--spacing-md);
    }
}

@media (max-width: 480px) {
    .input-wrapper {
        padding: var(--spacing-sm);
    }

    .suggestion-card {
        padding: var(--spacing-md);
    }

    .welcome-message {
        min-height: 50vh;
    }
}

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

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

.sidebar-footer {
    padding: 12px;
    border-top: 1px solid var(--border-color);
}

.user-profile {
    display: flex;
    align-items: center;
    gap: 10px;
    padding: 10px;
    border-radius: 8px;
    cursor: pointer;
    transition: background 0.2s;
}

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

.avatar {
    width: 32px;
    height: 32px;
    border-radius: 50%;
    background: var(--accent-color);
    display: flex;
    align-items: center;
    justify-content: center;
    font-weight: 600;
    font-size: 14px;
}

.user-name {
    font-size: 14px;
    color: var(--text-primary);
}

/* Main Chat Area */
.chat-container {
    flex: 1;
    display: flex;
    flex-direction: column;
    background: var(--bg-secondary);
}

.chat-header {
    padding: 16px 24px;
    border-bottom: 1px solid var(--border-color);
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.chat-title {
    font-size: 18px;
    font-weight: 600;
}

.icon-btn {
    background: transparent;
    border: none;
    color: var(--text-secondary);
    cursor: pointer;
    padding: 8px;
    border-radius: 6px;
    transition: all 0.2s;
}

.icon-btn:hover {
    background: var(--hover-bg);
    color: var(--text-primary);
}

/* Messages */
.messages-container {
    flex: 1;
    overflow-y: auto;
    padding: 24px;
}

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

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

.welcome-message {
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    height: 100%;
    text-align: center;
}

.logo {
    width: 64px;
    height: 64px;
    background: var(--bg-tertiary);
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    margin-bottom: 24px;
    color: var(--accent-color);
}

.welcome-message h2 {
    font-size: 28px;
    font-weight: 600;
    margin-bottom: 16px;
}

.message {
    display: flex;
    gap: 16px;
    margin-bottom: 24px;
    animation: fadeIn 0.3s ease;
}

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

.message-avatar {
    width: 32px;
    height: 32px;
    border-radius: 50%;
    flex-shrink: 0;
    display: flex;
    align-items: center;
    justify-content: center;
    font-weight: 600;
    font-size: 14px;
}

.message.user .message-avatar {
    background: var(--accent-color);
}

.message.assistant .message-avatar {
    background: var(--bg-tertiary);
    color: var(--text-primary);
}

.message-content {
    flex: 1;
    padding-top: 4px;
}

.message-text {
    font-size: 15px;
    line-height: 1.6;
    color: var(--text-primary);
    word-wrap: break-word;
}

.message-time {
    font-size: 12px;
    color: var(--text-secondary);
    margin-top: 8px;
}

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

.typing-indicator span {
    width: 8px;
    height: 8px;
    background: var(--text-secondary);
    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% { opacity: 0.3; }
    30% { opacity: 1; }
}

/* Input Container */
.input-container {
    padding: 24px;
    border-top: 1px solid var(--border-color);
    background: var(--bg-secondary);
}

.input-form {
    background: var(--bg-tertiary);
    border: 1px solid var(--border-color);
    border-radius: 12px;
    padding: 12px 16px;
    display: flex;
    align-items: flex-end;
    gap: 12px;
    transition: border-color 0.2s;
}

.input-form:focus-within {
    border-color: var(--accent-color);
}

.message-input {
    flex: 1;
    background: transparent;
    border: none;
    color: var(--text-primary);
    font-size: 15px;
    font-family: inherit;
    resize: none;
    outline: none;
    max-height: 200px;
    line-height: 1.5;
}

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

.send-btn {
    background: var(--accent-color);
    border: none;
    color: white;
    width: 36px;
    height: 36px;
    border-radius: 8px;
    display: flex;
    align-items: center;
    justify-content: center;
    cursor: pointer;
    flex-shrink: 0;
    transition: all 0.2s;
}

.send-btn:hover {
    background: #0d8f6f;
}

.send-btn:disabled {
    background: var(--border-color);
    cursor: not-allowed;
}

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

/* Responsive */
@media (max-width: 768px) {
    .sidebar {
        position: absolute;
        left: -260px;
        z-index: 100;
        height: 100vh;
    }

    .sidebar.open {
        transform: translateX(260px);
    }
}