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

:root {
    --primary-color: #2563eb;
    --primary-hover: #1d4ed8;
    --bg-color: #f8fafc;
    --card-bg: #ffffff;
    --text-primary: #1e293b;
    --text-secondary: #64748b;
    --border-color: #e2e8f0;
    --user-message-bg: #2563eb;
    --assistant-message-bg: #f1f5f9;
    --system-message-bg: #fef3c7;
    --error-color: #ef4444;
    --success-color: #10b981;
}

body {
    font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, 'Helvetica Neue', Arial, sans-serif;
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    min-height: 100vh;
    display: flex;
    justify-content: center;
    align-items: center;
    padding: 20px;
    color: var(--text-primary);
}

.container {
    width: 100%;
    max-width: 1000px;
    background: var(--card-bg);
    border-radius: 16px;
    box-shadow: 0 20px 60px rgba(0, 0, 0, 0.3);
    overflow: hidden;
    display: flex;
    flex-direction: column;
    height: calc(100vh - 40px);
    max-height: 800px;
}

header {
    background: linear-gradient(135deg, var(--primary-color) 0%, #1d4ed8 100%);
    color: white;
    padding: 24px;
}

.header-content {
    display: flex;
    justify-content: space-between;
    align-items: center;
    width: 100%;
    gap: 16px;
}

.header-title-section {
    flex: 1;
    text-align: center;
}

header h1 {
    font-size: 28px;
    font-weight: 700;
    margin-bottom: 8px;
}

.subtitle {
    font-size: 14px;
    opacity: 0.9;
    font-weight: 400;
}

header a {
    color: white;
    text-decoration: underline;
    text-decoration-color: rgba(255, 255, 255, 0.5);
    transition: text-decoration-color 0.2s ease, opacity 0.2s ease;
}

header a:hover {
    text-decoration-color: rgba(255, 255, 255, 1);
    opacity: 1;
}

main {
    flex: 1;
    display: flex;
    flex-direction: column;
    overflow: hidden;
}

.chat-container {
    display: flex;
    flex-direction: column;
    height: 100%;
}

.chat-messages {
    flex: 1;
    overflow-y: auto;
    padding: 24px;
    display: flex;
    flex-direction: column;
    gap: 16px;
}

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

.chat-messages::-webkit-scrollbar-track {
    background: var(--bg-color);
}

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

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

.message {
    padding: 16px 20px;
    border-radius: 16px;
    max-width: 80%;
    word-wrap: break-word;
    animation: fadeIn 0.3s ease-in;
    margin: 12px 0;
}

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

.message.user-message {
    background: var(--user-message-bg);
    color: white;
    align-self: flex-end;
    border-bottom-right-radius: 4px;
    padding: 10px 14px;
}

.message.user-message p {
    margin: 0;
    line-height: 1.4;
}

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

.message.system-message {
    background: var(--system-message-bg);
    color: var(--text-primary);
    align-self: center;
    max-width: 90%;
    text-align: center;
    border: 1px solid #fbbf24;
}

.message.system-message ul {
    list-style: none;
    margin-top: 12px;
    text-align: left;
}

.message.system-message li {
    padding: 4px 0;
    font-size: 14px;
}


/* Transparent container for initial examples */
.message.example-container {
    background: transparent;
    border: none;
    padding: 12px 0;
    margin-bottom: 16px;
}

.message.example-container .example-heading {
    margin-bottom: 12px;
    color: var(--text-primary);
}

/* Clickable example items */
.example-list {
    display: flex;
    flex-direction: column;
    gap: 16px;
    margin-top: 0;
    margin-bottom: 0;
    padding: 0;
}

.example-item {
    padding: 10px 14px;
    background: rgba(37, 99, 235, 0.06);
    border: 1.5px solid rgba(37, 99, 235, 0.15);
    border-radius: 10px;
    cursor: pointer;
    transition: all 0.2s cubic-bezier(0.4, 0, 0.2, 1);
    color: var(--primary-color);
    font-weight: 500;
    font-size: 14px;
    line-height: 1.4;
    display: block;
}

.example-item:hover {
    background: rgba(37, 99, 235, 0.1);
    border-color: rgba(37, 99, 235, 0.3);
    transform: translateY(-1px);
    box-shadow: 0 2px 6px rgba(37, 99, 235, 0.15);
}

.example-item:active {
    transform: translateY(0);
    background: rgba(37, 99, 235, 0.12);
}

.message p {
    margin: 0;
    line-height: 1.5;
    display: block;
}

.message p + p {
    margin-top: 8px;
}

/* Markdown styling within messages */
.message > * {
    display: block;
}

.message h1,
.message h2,
.message h3,
.message h4,
.message h5,
.message h6 {
    margin: 16px 0 8px 0;
    font-weight: 600;
    line-height: 1.4;
    color: var(--text-primary);
    display: block;
}

.message h1 {
    font-size: 24px;
    border-bottom: 2px solid var(--border-color);
    padding-bottom: 8px;
}

.message h2 {
    font-size: 20px;
    margin-top: 20px;
}

.message h3 {
    font-size: 18px;
}

.message ul,
.message ol {
    margin: 8px 0;
    padding-left: 24px;
    display: block;
    list-style-position: outside;
}

.message li {
    margin: 4px 0;
    line-height: 1.5;
    display: list-item;
    list-style-type: disc;
}

.message ol li {
    list-style-type: decimal;
}

/* Ensure example items are not affected by message spacing */
.message .example-list {
    margin: 0;
}

.message .example-item {
    margin: 10px;
}

.message strong,
.message b {
    font-weight: 600;
    color: var(--text-primary);
}

.message em,
.message i {
    font-style: italic;
}

.message code {
    background: rgba(0, 0, 0, 0.05);
    padding: 2px 6px;
    border-radius: 4px;
    font-family: 'Courier New', monospace;
    font-size: 0.9em;
}

.message pre {
    background: rgba(0, 0, 0, 0.05);
    padding: 12px;
    border-radius: 8px;
    overflow-x: auto;
    margin: 12px 0;
}

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

.message table {
    width: 100%;
    border-collapse: collapse;
    margin: 12px 0;
    font-size: 0.95em;
}

.message table th,
.message table td {
    padding: 8px 12px;
    text-align: left;
    border-bottom: 1px solid var(--border-color);
}

.message table th {
    background: var(--bg-color);
    font-weight: 600;
}

.message blockquote {
    border-left: 4px solid var(--primary-color);
    padding-left: 16px;
    margin: 12px 0;
    color: var(--text-secondary);
    font-style: italic;
}

.message hr {
    border: none;
    border-top: 2px solid var(--border-color);
    margin: 16px 0;
    height: 0;
    width: 100%;
    display: block;
    clear: both;
}

.message.loading {
    background: var(--assistant-message-bg);
    align-self: flex-start;
    display: flex;
    flex-direction: column;
    gap: 12px;
    padding: 16px 20px;
}

.message.loading .loading-dots {
    align-self: flex-start;
}

.loading-dots {
    display: flex;
    gap: 4px;
}

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

.loading-dot:nth-child(1) { animation-delay: -0.32s; }
.loading-dot:nth-child(2) { animation-delay: -0.16s; }

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

/* Progress Bar Styles */
.progress-bar-container {
    width: 100%;
    margin-top: 4px;
}

.progress-bar {
    width: 100%;
    height: 6px;
    background: var(--border-color);
    border-radius: 3px;
    overflow: hidden;
    position: relative;
}

.progress-bar-fill {
    height: 100%;
    background: linear-gradient(90deg, var(--primary-color) 0%, #1d4ed8 100%);
    border-radius: 3px;
    width: 0%;
    transition: width 0.1s linear;
    position: relative;
}

.progress-bar-fill::after {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    bottom: 0;
    right: 0;
    background: linear-gradient(
        90deg,
        transparent,
        rgba(255, 255, 255, 0.3),
        transparent
    );
    animation: shimmer 2s infinite;
}

@keyframes shimmer {
    0% {
        transform: translateX(-100%);
    }
    100% {
        transform: translateX(100%);
    }
}

.loading-text {
    font-size: 14px;
    color: var(--text-primary);
    font-weight: 500;
}

.loading-suggestion {
    font-size: 12px;
    color: var(--text-secondary);
    margin-top: 4px;
    line-height: 1.4;
}

.how-it-works-link {
    background: none;
    border: none;
    color: var(--primary-color);
    text-decoration: underline;
    cursor: pointer;
    font-size: 12px;
    padding: 0;
    font-family: inherit;
    font-weight: 600;
    transition: color 0.2s ease;
}

.how-it-works-link:hover {
    color: var(--primary-hover);
}

.message.error {
    background: #fee2e2;
    color: var(--error-color);
    border: 1px solid #fecaca;
}

.chat-input-container {
    padding: 20px;
    background: var(--bg-color);
    border-top: 1px solid var(--border-color);
}

#chat-form {
    display: flex;
    gap: 12px;
    align-items: center;
}

#message-input {
    flex: 1;
    padding: 14px 16px;
    border: 2px solid var(--border-color);
    border-radius: 12px;
    font-size: 16px;
    font-family: inherit;
    transition: all 0.2s;
    background: white;
    color: var(--text-primary);
}

#message-input:focus {
    outline: none;
    border-color: var(--primary-color);
    box-shadow: 0 0 0 3px rgba(37, 99, 235, 0.1);
}

#message-input:disabled {
    opacity: 0.6;
    cursor: not-allowed;
    background: #f1f5f9;
}

#send-button {
    padding: 14px 24px;
    background: var(--primary-color);
    color: white;
    border: none;
    border-radius: 12px;
    font-size: 16px;
    font-weight: 600;
    cursor: pointer;
    display: flex;
    align-items: center;
    gap: 8px;
    transition: all 0.2s;
}

#send-button:hover:not(:disabled) {
    background: var(--primary-hover);
    transform: translateY(-1px);
    box-shadow: 0 4px 12px rgba(37, 99, 235, 0.3);
}

#send-button:active:not(:disabled) {
    transform: translateY(0);
}

#send-button:disabled {
    opacity: 0.6;
    cursor: not-allowed;
}

footer {
    padding: 16px;
    text-align: center;
    background: var(--bg-color);
    border-top: 1px solid var(--border-color);
    color: var(--text-secondary);
    font-size: 14px;
}

footer a {
    color: var(--primary-color);
    text-decoration: none;
    transition: color 0.2s ease;
}

footer a:hover {
    color: var(--primary-hover);
    text-decoration: underline;
}

/* Header Buttons Container */
.header-buttons {
    display: flex;
    align-items: center;
    gap: 12px;
    margin-left: 16px;
}

/* GitHub Button */
.github-btn {
    background: rgba(255, 255, 255, 0.15);
    border: 2px solid rgba(255, 255, 255, 0.4);
    color: white;
    padding: 8px 12px;
    border-radius: 8px;
    cursor: pointer;
    display: flex;
    align-items: center;
    gap: 6px;
    font-size: 12px;
    font-weight: 600;
    transition: all 0.2s ease;
    box-shadow: 0 2px 8px rgba(0, 0, 0, 0.2);
    text-decoration: none;
}

.github-btn:hover {
    background: rgba(255, 255, 255, 0.25);
    border-color: rgba(255, 255, 255, 0.6);
    transform: translateY(-1px);
    box-shadow: 0 4px 12px rgba(0, 0, 0, 0.3);
    color: white;
}

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

/* Architecture Button */
.architecture-btn {
    background: rgba(255, 255, 255, 0.15);
    border: 2px solid rgba(255, 255, 255, 0.4);
    color: white;
    padding: 8px 12px;
    border-radius: 8px;
    cursor: pointer;
    display: flex;
    align-items: center;
    gap: 6px;
    font-size: 12px;
    font-weight: 600;
    transition: all 0.2s ease;
    box-shadow: 0 2px 8px rgba(0, 0, 0, 0.2);
}

.architecture-btn:hover {
    background: rgba(255, 255, 255, 0.25);
    border-color: rgba(255, 255, 255, 0.6);
    transform: translateY(-1px);
    box-shadow: 0 4px 12px rgba(0, 0, 0, 0.3);
}

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

/* Architecture Modal */
.architecture-modal {
    display: none;
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    z-index: 1000;
    animation: fadeIn 0.3s ease;
}

.architecture-modal.active {
    display: flex;
    align-items: center;
    justify-content: center;
}

.architecture-modal-overlay {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: rgba(0, 0, 0, 0.7);
    backdrop-filter: blur(4px);
}

.architecture-modal-content {
    position: relative;
    background: var(--card-bg);
    border-radius: 16px;
    max-width: 1000px;
    width: 93%;
    max-height: 90vh;
    overflow-y: auto;
    box-shadow: 0 20px 60px rgba(0, 0, 0, 0.5);
    animation: slideUp 0.3s ease;
    z-index: 1001;
}

.architecture-modal-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 24px;
    border-bottom: 1px solid var(--border-color);
    background: linear-gradient(135deg, var(--primary-color) 0%, #1d4ed8 100%);
    color: white;
    border-radius: 16px 16px 0 0;
}

.architecture-modal-header h2 {
    margin: 0;
    font-size: 24px;
    font-weight: 700;
}

.architecture-modal-close {
    background: rgba(255, 255, 255, 0.2);
    border: none;
    color: white;
    width: 36px;
    height: 36px;
    border-radius: 8px;
    cursor: pointer;
    display: flex;
    align-items: center;
    justify-content: center;
    transition: all 0.2s ease;
}

.architecture-modal-close:hover {
    background: rgba(255, 255, 255, 0.3);
    transform: rotate(90deg);
}

/* Architecture Diagram */
.architecture-diagram {
    padding: 32px;
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 20px;
    background: var(--bg-color);
}

.arch-row {
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 16px;
    width: 100%;
    flex-wrap: wrap;
}

.arch-row-top {
    margin-bottom: 0;
}

.arch-row-bottom {
    margin-top: 0;
}

.desktop-only {
    display: block;
}

.mobile-only {
    display: none;
}

.arch-component {
    background: var(--card-bg);
    border: 2px solid var(--border-color);
    border-radius: 12px;
    padding: 20px;
    text-align: center;
    min-width: 180px;
    box-shadow: 0 4px 12px rgba(0, 0, 0, 0.1);
    transition: transform 0.2s ease, box-shadow 0.2s ease;
}

.arch-component:hover {
    transform: translateY(-4px);
    box-shadow: 0 8px 20px rgba(0, 0, 0, 0.15);
}

.arch-icon {
    font-size: 48px;
    margin-bottom: 12px;
}

.arch-label {
    font-weight: 700;
    font-size: 16px;
    color: var(--text-primary);
    margin-bottom: 8px;
}

.arch-label a {
    color: var(--text-primary);
    text-decoration: none;
    transition: color 0.2s ease;
}

.arch-label a:hover {
    color: var(--primary-color);
    text-decoration: underline;
}

.arch-desc {
    font-size: 12px;
    color: var(--text-secondary);
    line-height: 1.5;
}

.arch-desc a {
    color: var(--primary-color);
    text-decoration: none;
    font-weight: 500;
}

.arch-desc a:hover {
    text-decoration: underline;
}

.arch-security {
    margin-top: 8px;
    font-size: 11px;
    color: var(--success-color);
    font-weight: 600;
}

.arch-arrow-horizontal {
    font-size: 32px;
    color: var(--primary-color);
    font-weight: bold;
    display: flex;
    align-items: center;
    justify-content: center;
    min-width: 40px;
    height: 100%;
    flex-shrink: 0;
}

.arch-arrow-horizontal-bidirectional {
    font-size: 32px;
    color: var(--primary-color);
    font-weight: bold;
    display: flex;
    align-items: center;
    justify-content: center;
    min-width: 40px;
    height: 100%;
    flex-shrink: 0;
}

.arch-arrow-down-center {
    font-size: 32px;
    color: var(--primary-color);
    font-weight: bold;
    display: flex;
    align-items: center;
    justify-content: center;
    width: 100%;
    margin: -10px 0;
}

.arch-arrow-up-center-bidirectional {
    font-size: 32px;
    color: var(--primary-color);
    font-weight: bold;
    display: flex;
    align-items: center;
    justify-content: center;
    width: 100%;
    margin: -10px 0;
}

.arch-flow {
    display: flex;
    flex-wrap: wrap;
    gap: 12px;
    margin-top: 16px;
    justify-content: center;
}

.arch-flow-step {
    display: flex;
    align-items: center;
    gap: 8px;
    background: var(--card-bg);
    padding: 8px 16px;
    border-radius: 20px;
    border: 1px solid var(--border-color);
    font-size: 14px;
}

.arch-step-number {
    background: var(--primary-color);
    color: white;
    width: 24px;
    height: 24px;
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    font-weight: 700;
    font-size: 12px;
}

.arch-step-text {
    color: var(--text-primary);
}

.architecture-details {
    padding: 24px;
}

.architecture-details h3 {
    margin-top: 0;
    margin-bottom: 16px;
    color: var(--text-primary);
    font-size: 20px;
}

.architecture-details ol {
    margin-left: 20px;
    margin-bottom: 24px;
    line-height: 1.8;
}

.architecture-details li {
    margin-bottom: 12px;
    color: var(--text-secondary);
}

.architecture-details li strong {
    color: var(--text-primary);
}

.architecture-security,
.architecture-data {
    margin-top: 24px;
    padding-top: 24px;
    border-top: 1px solid var(--border-color);
}

.architecture-security h4,
.architecture-data h4 {
    margin-bottom: 12px;
    color: var(--text-primary);
    font-size: 16px;
}

.architecture-security ul,
.architecture-data ul {
    margin-left: 20px;
    line-height: 1.8;
}

.architecture-security li,
.architecture-data li {
    margin-bottom: 12px;
    color: var(--text-secondary);
}

.architecture-security li strong,
.architecture-data li strong {
    color: var(--text-primary);
}

.architecture-security code {
    background: var(--bg-color);
    padding: 2px 6px;
    border-radius: 4px;
    font-family: 'Courier New', monospace;
    font-size: 12px;
    color: var(--primary-color);
}

.architecture-security a,
.architecture-data a {
    color: var(--primary-color);
    text-decoration: none;
}

.architecture-security a:hover,
.architecture-data a:hover {
    text-decoration: underline;
}

.architecture-tech {
    margin-top: 24px;
    padding-top: 24px;
    border-top: 1px solid var(--border-color);
}

.architecture-tech h4 {
    margin-bottom: 12px;
    color: var(--text-primary);
    font-size: 16px;
}

.tech-tags {
    display: flex;
    flex-wrap: wrap;
    gap: 8px;
}

.tech-tag {
    background: var(--primary-color);
    color: white;
    padding: 6px 12px;
    border-radius: 16px;
    font-size: 12px;
    font-weight: 500;
}

/* Animations */
@keyframes fadeIn {
    from {
        opacity: 0;
    }
    to {
        opacity: 1;
    }
}

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

/* Responsive design */
@media (max-width: 768px) {
    .container {
        height: 100vh;
        max-height: 100vh;
        border-radius: 0;
    }

    .message {
        max-width: 85%;
    }

    header h1 {
        font-size: 24px;
    }

    .subtitle {
        font-size: 13px;
    }

    .header-content {
        flex-direction: column !important;
        gap: 12px;
    }

    .header-buttons {
        margin-left: 0 !important;
        width: 100%;
        flex-direction: column;
        gap: 8px;
    }

    .github-btn,
    .architecture-btn {
        width: 100%;
        justify-content: center;
        margin-left: 0 !important;
    }

    .architecture-modal-content {
        width: 97%;
        max-height: 95vh;
    }

    .architecture-diagram {
        padding: 20px;
    }

    .arch-row-top {
        flex-direction: column;
        gap: 12px;
    }

    .arch-arrow-horizontal {
        transform: rotate(90deg);
        margin: -8px 0;
    }

    .desktop-only {
        display: none !important;
    }

    .mobile-only {
        display: block !important;
    }

    .arch-arrow-up-center-bidirectional {
        transform: rotate(90deg);
        margin: 8px 0;
    }

    .arch-row-bottom {
        flex-direction: row;
        justify-content: center;
        align-items: flex-start;
        gap: 12px;
        margin-top: 12px;
    }

    .arch-component.arch-llm,
    .arch-component.arch-mcp {
        flex: 1;
        min-width: 140px;
        max-width: 200px;
    }

    .arch-component {
        min-width: 150px;
        padding: 16px;
        width: 100%;
        max-width: 250px;
    }

    .arch-icon {
        font-size: 36px;
    }

    .arch-flow {
        flex-direction: column;
        align-items: stretch;
    }

    .arch-flow-step {
        justify-content: center;
    }
}