frontend/src/components/ChatArea.css

.chat-area {
    grid-row: 2;
    display: flex;
    flex-direction: column;
    height: calc(100vh - var(--topnav-height));
    overflow: hidden;
    position: relative;
}

/* Welcome Screen (Unauthenticated) */
.chat-welcome {
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    text-align: center;
    padding: var(--space-8);
    height: 100%;
    max-width: 800px;
    margin: 0 auto;
}

.welcome-icon {
    width: 100px;
    height: 100px;
    display: flex;
    align-items: center;
    justify-content: center;
    background: var(--bg-glass);
    border-radius: var(--radius-2xl);
    margin-bottom: var(--space-6);
    border: 1px solid var(--border-subtle);
}

.chat-welcome h1 {
    font-size: var(--text-3xl);
    font-weight: 700;
    letter-spacing: -0.03em;
    margin-bottom: var(--space-3);
    background: var(--accent-gradient);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.chat-welcome>p {
    font-size: var(--text-lg);
    color: var(--text-secondary);
    max-width: 500px;
    margin-bottom: var(--space-8);
}

.welcome-features {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: var(--space-4);
    width: 100%;
    max-width: 600px;
    margin-bottom: var(--space-8);
}

.feature-card {
    padding: var(--space-5);
    background: var(--bg-glass);
    border: 1px solid var(--border-subtle);
    border-radius: var(--radius-lg);
    text-align: center;
    transition: all var(--transition-base);
}

.feature-card:hover {
    background: var(--bg-glass-hover);
    border-color: var(--border-medium);
    transform: translateY(-2px);
}

.feature-card svg {
    color: var(--accent-primary);
    margin-bottom: var(--space-3);
}

.feature-card h3 {
    font-size: var(--text-sm);
    font-weight: 600;
    margin-bottom: var(--space-1);
}

.feature-card p {
    font-size: var(--text-xs);
    color: var(--text-tertiary);
}

.welcome-cta {
    font-size: var(--text-sm);
    color: var(--text-tertiary);
}

/* Error Toast */
.error-toast {
    position: absolute;
    top: var(--space-4);
    left: 50%;
    transform: translateX(-50%);
    display: flex;
    align-items: center;
    gap: var(--space-3);
    padding: var(--space-3) var(--space-4);
    background: var(--error-bg);
    border: 1px solid rgba(239, 68, 68, 0.3);
    border-radius: var(--radius-lg);
    color: var(--error);
    z-index: 10;
    max-width: 90%;
}

.error-toast span {
    font-size: var(--text-sm);
}

/* Messages Container */
.messages-container {
    flex: 1;
    overflow-y: auto;
    padding: var(--space-6) var(--space-4);
}

.messages-wrapper {
    max-width: var(--chat-max-width);
    margin: 0 auto;
    display: flex;
    flex-direction: column;
    gap: var(--space-1);
}

/* Empty State */
.chat-empty {
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    text-align: center;
    padding: var(--space-16) var(--space-4);
    min-height: 50vh;
}

.empty-icon {
    width: 80px;
    height: 80px;
    display: flex;
    align-items: center;
    justify-content: center;
    background: var(--bg-glass);
    border-radius: var(--radius-xl);
    margin-bottom: var(--space-6);
    color: var(--text-tertiary);
}

.chat-empty h2 {
    font-size: var(--text-xl);
    font-weight: 600;
    margin-bottom: var(--space-2);
}

.chat-empty>p {
    color: var(--text-secondary);
    margin-bottom: var(--space-8);
}

/* Suggested Questions */
.suggested-questions {
    width: 100%;
    max-width: 600px;
}

.suggestions-label {
    font-size: var(--text-sm);
    color: var(--text-tertiary);
    margin-bottom: var(--space-3);
}

.suggestions-grid {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: var(--space-2);
}

.suggestion-chip {
    padding: var(--space-3) var(--space-4);
    background: var(--bg-tertiary);
    border: 1px solid var(--border-subtle);
    border-radius: var(--radius-lg);
    color: var(--text-secondary);
    font-size: var(--text-sm);
    text-align: left;
    cursor: pointer;
    transition: all var(--transition-base);
}

.suggestion-chip:hover {
    background: var(--bg-elevated);
    border-color: var(--accent-primary);
    color: var(--text-primary);
}

/* Loading Row */
.message-row.loading {
    animation: fadeInUp var(--transition-slow) ease;
}

.typing-indicator {
    display: flex;
    align-items: center;
    gap: 4px;
    padding: var(--space-3) 0;
}

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

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

.typing-indicator span:nth-child(2) {
    animation-delay: 0.16s;
}

.typing-indicator span:nth-child(3) {
    animation-delay: 0.32s;
}

/* Input Area */
.input-area {
    padding: var(--space-4) var(--space-4) var(--space-6);
    background: linear-gradient(to top, var(--bg-primary) 80%, transparent);
}

.input-wrapper {
    max-width: var(--chat-max-width);
    margin: 0 auto;
    display: flex;
    align-items: flex-end;
    gap: var(--space-2);
}

.clear-btn {
    flex-shrink: 0;
    margin-bottom: var(--space-1);
}

.chat-form {
    flex: 1;
    display: flex;
    align-items: flex-end;
    gap: var(--space-2);
    padding: var(--space-3);
    background: var(--bg-tertiary);
    border: 1px solid var(--border-subtle);
    border-radius: var(--radius-xl);
    transition: all var(--transition-base);
}

.chat-form:focus-within {
    border-color: var(--accent-primary);
    box-shadow: 0 0 0 3px rgba(99, 102, 241, 0.1);
}

.chat-input {
    flex: 1;
    background: transparent;
    border: none;
    color: var(--text-primary);
    font-family: var(--font-sans);
    font-size: var(--text-base);
    line-height: 1.5;
    resize: none;
    max-height: 200px;
    padding: var(--space-1) var(--space-2);
}

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

.chat-input:focus {
    outline: none;
}

.send-btn {
    flex-shrink: 0;
    padding: var(--space-2) var(--space-3);
    border-radius: var(--radius-lg);
}

.send-btn .loading-dots {
    display: flex;
    gap: 2px;
}

.send-btn .loading-dots span {
    width: 4px;
    height: 4px;
    background: currentColor;
    border-radius: 50%;
    animation: bounce 1.4s ease-in-out infinite;
}

.input-hint {
    text-align: center;
    font-size: var(--text-xs);
    color: var(--text-tertiary);
    margin-top: var(--space-2);
}

@media (max-width: 768px) {
    .welcome-features {
        grid-template-columns: 1fr;
    }

    .suggestions-grid {
        grid-template-columns: 1fr;
    }

    .chat-welcome h1 {
        font-size: var(--text-2xl);
    }
}