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

:root {
    --bg-primary: #0d1117;
    --bg-secondary: #161b22;
    --bg-tertiary: #21262d;
    --text-primary: #f0f6fc;
    --text-secondary: #8b949e;
    --accent-primary: #238636;
    --accent-hover: #2ea043;
    --border-color: #30363d;
    --bot-bg: #1f2428;
    --user-bg: #238636;
    --error-color: #f85149;
    --warning-color: #d29922;
}

body {
    font-family: 'Inter', -apple-system, BlinkMacSystemFont, sans-serif;
    background-color: var(--bg-primary);
    color: var(--text-primary);
    height: 100vh;
    overflow: hidden;
}

.app-container {
    display: flex;
    flex-direction: column;
    height: 100vh;
    max-width: 900px;
    margin: 0 auto;
}

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

.logo {
    display: flex;
    align-items: center;
    gap: 12px;
    font-size: 18px;
    font-weight: 600;
    color: var(--text-primary);
}

.logo svg {
    color: var(--accent-primary);
}

.btn-github {
    display: flex;
    align-items: center;
    gap: 8px;
    padding: 8px 16px;
    background-color: var(--bg-tertiary);
    color: var(--text-primary);
    border: 1px solid var(--border-color);
    border-radius: 6px;
    cursor: pointer;
    font-size: 14px;
    font-weight: 500;
    transition: background-color 0.2s;
}

.btn-github:hover {
    background-color: var(--border-color);
}

.user-info {
    display: flex;
    align-items: center;
    gap: 8px;
}

.user-info img {
    width: 32px;
    height: 32px;
    border-radius: 50%;
}

/* Chat Container */
.chat-container {
    flex: 1;
    overflow-y: auto;
    padding: 24px;
    scroll-behavior: smooth;
}

.chat-messages {
    display: flex;
    flex-direction: column;
    gap: 16px;
}

/* Messages */
.message {
    display: flex;
    gap: 12px;
    max-width: 85%;
    animation: fadeIn 0.3s ease;
}

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

.message.bot {
    align-self: flex-start;
}

.message.user {
    align-self: flex-end;
    flex-direction: row-reverse;
}

.message-avatar {
    width: 36px;
    height: 36px;
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    flex-shrink: 0;
}

.message.bot .message-avatar {
    background: linear-gradient(135deg, #238636, #1a7f37);
}

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

.message-avatar img {
    width: 100%;
    height: 100%;
    border-radius: 50%;
}

.message-avatar svg {
    width: 20px;
    height: 20px;
    color: white;
}

.message-content {
    padding: 12px 16px;
    border-radius: 12px;
    font-size: 14px;
    line-height: 1.5;
}

.message.bot .message-content {
    background-color: var(--bot-bg);
    border: 1px solid var(--border-color);
    border-bottom-left-radius: 4px;
}

.message.user .message-content {
    background-color: var(--user-bg);
    border-bottom-right-radius: 4px;
}

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

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

.typing-indicator span:nth-child(1) { animation-delay: -0.32s; }
.typing-indicator span:nth-child(2) { animation-delay: -0.16s; }

@keyframes bounce {
    0%, 80%, 100% { transform: scale(0); }
    40% { transform: scale(1); }
}

/* Summary Card */
.summary-card {
    background-color: var(--bg-tertiary);
    border: 1px solid var(--border-color);
    border-radius: 8px;
    padding: 16px;
    margin-top: 8px;
}

.summary-card h4 {
    margin-bottom: 12px;
    color: var(--accent-primary);
    font-size: 14px;
}

.summary-item {
    display: flex;
    justify-content: space-between;
    padding: 6px 0;
    font-size: 13px;
    border-bottom: 1px solid var(--border-color);
}

.summary-item:last-child {
    border-bottom: none;
}

.summary-item .label {
    color: var(--text-secondary);
}

.summary-item .value {
    color: var(--text-primary);
    font-weight: 500;
}

/* Input Area */
.input-area {
    padding: 16px 24px;
    border-top: 1px solid var(--border-color);
    background-color: var(--bg-secondary);
}

.input-container {
    display: flex;
    flex-direction: column;
    gap: 12px;
}

.options-container {
    display: flex;
    flex-wrap: wrap;
    gap: 8px;
}

.option-btn {
    padding: 8px 16px;
    background-color: var(--bg-tertiary);
    color: var(--text-primary);
    border: 1px solid var(--border-color);
    border-radius: 20px;
    cursor: pointer;
    font-size: 14px;
    transition: all 0.2s;
}

.option-btn:hover {
    background-color: var(--accent-primary);
    border-color: var(--accent-primary);
}

.text-input-container {
    display: flex;
    gap: 8px;
}

#user-input {
    flex: 1;
    padding: 12px 16px;
    background-color: var(--bg-tertiary);
    color: var(--text-primary);
    border: 1px solid var(--border-color);
    border-radius: 8px;
    font-size: 14px;
    outline: none;
    transition: border-color 0.2s;
}

#user-input:focus {
    border-color: var(--accent-primary);
}

#user-input::placeholder {
    color: var(--text-secondary);
}

.btn-send {
    padding: 12px;
    background-color: var(--accent-primary);
    color: white;
    border: none;
    border-radius: 8px;
    cursor: pointer;
    transition: background-color 0.2s;
}

.btn-send:hover {
    background-color: var(--accent-hover);
}

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

/* Loading Overlay */
.loading-overlay {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background-color: rgba(13, 17, 23, 0.9);
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    gap: 16px;
    z-index: 1000;
}

.loading-spinner {
    width: 48px;
    height: 48px;
    border: 4px solid var(--border-color);
    border-top-color: var(--accent-primary);
    border-radius: 50%;
    animation: spin 1s linear infinite;
}

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

/* Modal */
.modal-overlay {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background-color: rgba(13, 17, 23, 0.9);
    display: flex;
    align-items: center;
    justify-content: center;
    z-index: 1000;
}

.modal-content {
    background-color: var(--bg-secondary);
    border: 1px solid var(--border-color);
    border-radius: 12px;
    padding: 32px;
    text-align: center;
    max-width: 400px;
    width: 90%;
}

.modal-icon {
    width: 64px;
    height: 64px;
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 32px;
    margin: 0 auto 16px;
}

.modal-icon.success {
    background-color: var(--accent-primary);
    color: white;
}

.modal-content h2 {
    margin-bottom: 8px;
}

.modal-content p {
    color: var(--text-secondary);
    margin-bottom: 24px;
    word-break: break-all;
}

.modal-actions {
    display: flex;
    gap: 12px;
    justify-content: center;
}

.btn-primary {
    padding: 10px 20px;
    background-color: var(--accent-primary);
    color: white;
    border: none;
    border-radius: 6px;
    font-size: 14px;
    font-weight: 500;
    cursor: pointer;
    text-decoration: none;
    transition: background-color 0.2s;
}

.btn-primary:hover {
    background-color: var(--accent-hover);
}

.btn-secondary {
    padding: 10px 20px;
    background-color: transparent;
    color: var(--text-primary);
    border: 1px solid var(--border-color);
    border-radius: 6px;
    font-size: 14px;
    font-weight: 500;
    cursor: pointer;
    transition: background-color 0.2s;
}

.btn-secondary:hover {
    background-color: var(--bg-tertiary);
}

/* Scrollbar */
::-webkit-scrollbar {
    width: 8px;
}

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

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

::-webkit-scrollbar-thumb:hover {
    background: var(--text-secondary);
}

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

    .logo span {
        display: none;
    }

    .chat-container {
        padding: 16px;
    }

    .message {
        max-width: 95%;
    }

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

/* Device Code Modal */
.device-code {
    font-family: 'Courier New', monospace;
    font-size: 32px;
    font-weight: bold;
    letter-spacing: 4px;
    background-color: var(--bg-tertiary);
    padding: 16px 24px;
    border-radius: 8px;
    border: 2px dashed var(--accent-primary);
    margin: 12px 0;
    user-select: all;
}

.btn-copy {
    padding: 8px 16px;
    background-color: var(--bg-tertiary);
    color: var(--text-primary);
    border: 1px solid var(--border-color);
    border-radius: 6px;
    cursor: pointer;
    font-size: 14px;
    transition: all 0.2s;
}

.btn-copy:hover {
    background-color: var(--accent-primary);
    border-color: var(--accent-primary);
}

.text-muted {
    color: var(--text-secondary);
    font-size: 13px;
    margin-top: 16px;
}

.loading-spinner-small {
    display: inline-block;
    width: 16px;
    height: 16px;
    border: 2px solid var(--border-color);
    border-top-color: var(--accent-primary);
    border-radius: 50%;
    animation: spin 1s linear infinite;
    margin-left: 8px;
    vertical-align: middle;
}