:root {
    --bg-primary: #0f0f0f;
    --bg-secondary: #1a1a1a;
    --bg-message-user: #2563eb;
    --bg-message-assistant: #262626;
    --text-primary: #f5f5f5;
    --text-secondary: #a3a3a3;
    --border-color: #333;
    --accent: #3b82f6;
    --error: #ef4444;
    --success: #22c55e;
}

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

html, body {
    height: 100%;
    font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
    background: var(--bg-primary);
    color: var(--text-primary);
    overflow: hidden;
}

.chat-container {
    display: flex;
    flex-direction: column;
    height: 100%;
    max-width: 800px;
    margin: 0 auto;
}

/* Header */
.chat-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 16px 20px;
    background: var(--bg-secondary);
    border-bottom: 1px solid var(--border-color);
}

.chat-header h1 {
    font-size: 1.25rem;
    font-weight: 600;
}

.status {
    font-size: 0.75rem;
    padding: 4px 10px;
    border-radius: 12px;
    background: var(--border-color);
}

.status.connected {
    background: var(--success);
    color: #000;
}

.status.error {
    background: var(--error);
}

.nav-link {
    font-size: 0.875rem;
    color: var(--text-secondary);
    text-decoration: none;
    padding: 6px 12px;
    border-radius: 6px;
    background: var(--bg-primary);
    border: 1px solid var(--border-color);
    transition: background 0.2s, color 0.2s;
}

.nav-link:hover {
    background: var(--accent);
    color: var(--text-primary);
    border-color: var(--accent);
}

/* Messages */
.chat-messages {
    flex: 1;
    overflow-y: auto;
    padding: 20px;
    display: flex;
    flex-direction: column;
    gap: 12px;
}

.message {
    max-width: 85%;
    padding: 12px 16px;
    border-radius: 18px;
    line-height: 1.4;
    animation: fadeIn 0.2s ease;
    word-wrap: break-word;
    white-space: pre-wrap;
}

@keyframes fadeIn {
    from { opacity: 0; transform: translateY(8px); }
    to { opacity: 1; transform: translateY(0); }
}

.message.user {
    align-self: flex-end;
    background: var(--bg-message-user);
    border-bottom-right-radius: 4px;
}

.message.assistant {
    align-self: flex-start;
    background: var(--bg-message-assistant);
    border-bottom-left-radius: 4px;
}

.message.error {
    align-self: center;
    background: var(--error);
    font-size: 0.875rem;
}

.message.system {
    align-self: center;
    background: transparent;
    color: var(--text-secondary);
    font-size: 0.75rem;
    padding: 8px;
}

.message .timestamp {
    display: block;
    font-size: 0.65rem;
    color: var(--text-secondary);
    margin-top: 6px;
    opacity: 0.7;
}

.message.user .timestamp {
    text-align: right;
}

/* Thinking indicator */
.thinking {
    display: flex;
    gap: 4px;
    padding: 16px;
}

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

.thinking span:nth-child(2) { animation-delay: 0.2s; }
.thinking span:nth-child(3) { animation-delay: 0.4s; }

@keyframes bounce {
    0%, 60%, 100% { transform: translateY(0); }
    30% { transform: translateY(-8px); }
}

/* Input */
.chat-input {
    padding: 12px 16px;
    background: var(--bg-secondary);
    border-top: 1px solid var(--border-color);
}

.chat-input form {
    display: flex;
    gap: 10px;
}

.chat-input input {
    flex: 1;
    padding: 14px 18px;
    border: none;
    border-radius: 24px;
    background: var(--bg-primary);
    color: var(--text-primary);
    font-size: 1rem;
    outline: none;
}

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

.chat-input input:focus {
    box-shadow: 0 0 0 2px var(--accent);
}

.chat-input button {
    width: 48px;
    height: 48px;
    border: none;
    border-radius: 50%;
    background: var(--accent);
    color: white;
    cursor: pointer;
    display: flex;
    align-items: center;
    justify-content: center;
    transition: background 0.2s;
}

.chat-input button:hover {
    background: #2563eb;
}

.chat-input button:active {
    transform: scale(0.95);
}

.chat-input button:disabled {
    background: var(--border-color);
    cursor: not-allowed;
}

#clear-btn {
    background: var(--border-color);
}

#clear-btn:hover {
    background: var(--error);
}

.chat-input button svg {
    width: 22px;
    height: 22px;
}

/* Scrollbar */
.chat-messages::-webkit-scrollbar {
    width: 6px;
}

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

.chat-messages::-webkit-scrollbar-thumb {
    background: var(--border-color);
    border-radius: 3px;
}

/* Mobile adjustments */
@media (max-width: 600px) {
    .chat-header {
        padding: 12px 16px;
    }

    .chat-messages {
        padding: 12px;
    }

    .message {
        max-width: 90%;
        padding: 10px 14px;
    }

    .chat-input {
        padding: 10px 12px;
        padding-bottom: calc(10px + env(safe-area-inset-bottom));
    }

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

    .chat-input button {
        width: 44px;
        height: 44px;
    }
}

/* Safe area for notched phones */
@supports (padding-bottom: env(safe-area-inset-bottom)) {
    .chat-input {
        padding-bottom: calc(12px + env(safe-area-inset-bottom));
    }
}