/* Protocol Demo - Minimalist Black & White Design */

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

:root {
    --bg-primary: #0d0e12;
    --bg-secondary: rgba(20, 22, 28, 0.85);
    --bg-tertiary: #14161c;
    --bg-card: rgba(20, 22, 28, 0.7);
    --text-primary: #f8fafc;
    --text-secondary: #94a3b8;
    --text-muted: #64748b;
    --border: rgba(255, 255, 255, 0.08);
    --border-light: rgba(163, 175, 191, 0.2);
    --hover: rgba(255, 255, 255, 0.05);
    --active: rgba(59, 130, 246, 0.1);
    --user-message: rgba(20, 22, 28, 0.9);
    --assistant-message: rgba(13, 14, 18, 0.95);
    --accent-blue: #2563eb;
    --accent-blue-dark: #1e40af;
    --accent-blue-light: #3b82f6;
    --accent-gradient: linear-gradient(135deg, #2563eb 0%, #3b82f6 100%);
}

body {
    font-family: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;
    background: var(--bg-primary);
    color: var(--text-primary);
    height: 100vh;
    overflow: hidden;
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
}

.app-container {
    display: flex;
    height: 100vh;
    overflow: hidden;
}

/* Sidebar */
.sidebar {
    width: 240px;
    background: var(--bg-primary);
    border-right: 1px solid var(--border);
    display: flex;
    flex-direction: column;
    flex-shrink: 0;
}

.sidebar-header {
    padding: 1.25rem 1rem;
    border-bottom: 1px solid var(--border);
}

.logo-link {
    display: flex;
    align-items: center;
    justify-content: center;
    width: 40px;
    height: 40px;
    color: var(--text-primary);
    transition: opacity 0.2s;
}

.logo-link:hover {
    opacity: 0.7;
}

.sidebar-search {
    padding: 1rem;
    border-bottom: 1px solid var(--border);
}

.search-bar {
    display: flex;
    align-items: center;
    gap: 0.5rem;
    padding: 0.5rem 0.75rem;
    background: var(--bg-secondary);
    border: 1px solid var(--border);
    border-radius: 0.5rem;
    color: var(--text-muted);
    font-size: 0.875rem;
    cursor: pointer;
    transition: all 0.2s;
}

.search-bar:hover {
    border-color: var(--text-secondary);
    color: var(--text-secondary);
}

.sidebar-nav {
    padding: 0.5rem;
    flex: 1;
    overflow-y: auto;
}

.nav-item {
    width: 100%;
    display: flex;
    align-items: center;
    gap: 0.75rem;
    padding: 0.75rem;
    border-radius: 0.75rem;
    background: transparent;
    border: none;
    color: var(--text-secondary);
    font-size: 0.9375rem;
    font-weight: 500;
    cursor: pointer;
    transition: all 0.2s cubic-bezier(0.4, 0, 0.2, 1);
    font-family: inherit;
    text-align: left;
    margin-bottom: 0.25rem;
}

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

.nav-item.active {
    background: var(--active);
    color: var(--text-primary);
    font-weight: 600;
}

.sidebar-projects {
    padding: 1rem;
    border-top: 1px solid var(--border);
}

.project-item {
    display: flex;
    align-items: center;
    gap: 0.75rem;
    padding: 0.625rem;
    border-radius: 0.5rem;
    cursor: pointer;
    transition: all 0.2s;
    margin-bottom: 0.25rem;
}

.project-item:hover {
    background: var(--hover);
}

.project-item.active {
    background: var(--active);
}

.project-icon {
    width: 36px;
    height: 36px;
    border-radius: 0.75rem;
    background: var(--accent-gradient);
    display: flex;
    align-items: center;
    justify-content: center;
    color: var(--text-light, #ffffff);
    flex-shrink: 0;
    box-shadow: 0 2px 10px rgba(37, 99, 235, 0.3);
}

.project-item span {
    font-size: 0.875rem;
    color: var(--text-secondary);
    font-weight: 500;
}

.project-item.active span {
    color: var(--text-primary);
    font-weight: 600;
}

/* Main Content */
.main-content {
    flex: 1;
    display: flex;
    flex-direction: column;
    background: var(--bg-primary);
    overflow: hidden;
}

.main-header {
    padding: 1.25rem 1.5rem;
    border-bottom: 1px solid var(--border);
    display: flex;
    align-items: center;
    justify-content: space-between;
    background: var(--bg-primary);
}

.header-title {
    font-size: 1.5rem;
    font-weight: 700;
    color: var(--text-primary);
}

.header-button {
    padding: 0.5rem;
    border-radius: 0.5rem;
    background: transparent;
    border: none;
    color: var(--text-muted);
    cursor: pointer;
    transition: all 0.2s;
}

.header-button:hover {
    background: var(--hover);
    color: var(--text-primary);
}

/* Messages */
.messages-container {
    flex: 1;
    overflow-y: auto;
    padding: 1.5rem;
}

.messages-wrapper {
    max-width: 896px;
    margin: 0 auto;
}

.message-assistant,
.message-user {
    display: flex;
    gap: 0.75rem;
    margin-bottom: 1.5rem;
}

.message-user {
    justify-content: flex-end;
}

.message-avatar {
    width: 40px;
    height: 40px;
    border-radius: 50%;
    background: var(--accent-gradient);
    display: flex;
    align-items: center;
    justify-content: center;
    color: var(--text-light, #ffffff);
    flex-shrink: 0;
    box-shadow: 0 2px 10px rgba(37, 99, 235, 0.3);
}

.message-user .message-avatar {
    background: var(--bg-card);
    border: 1px solid var(--border);
    color: var(--text-primary);
    box-shadow: none;
}

.message-content {
    flex: 1;
    max-width: 80%;
}

.message-bubble {
    padding: 1rem 1.25rem;
    border-radius: 1.25rem;
    line-height: 1.6;
    word-wrap: break-word;
    transition: all 0.2s;
}

.message-bubble.assistant {
    background: var(--assistant-message);
    border: 1px solid var(--border);
    color: var(--text-primary);
}

.message-bubble.user {
    background: var(--user-message);
    color: var(--text-primary);
}

.message-bubble p {
    margin: 0;
    white-space: pre-wrap;
}

.message-bubble strong {
    font-weight: 600;
}

/* Input Area */
.input-container {
    padding: 1.5rem;
    border-top: 1px solid var(--border);
    background: var(--bg-primary);
}

.input-form {
    max-width: 896px;
    margin: 0 auto;
    display: flex;
    gap: 0.75rem;
    align-items: flex-end;
}

.input-wrapper {
    flex: 1;
}

.input-actions {
    display: flex;
    gap: 0.5rem;
    margin-bottom: 0.5rem;
}

.input-action-btn {
    padding: 0.5rem;
    border-radius: 0.5rem;
    background: transparent;
    border: none;
    color: var(--text-muted);
    cursor: pointer;
    transition: all 0.2s;
}

.input-action-btn:hover {
    background: var(--hover);
    color: var(--text-primary);
}

.message-input {
    width: 100%;
    min-height: 52px;
    max-height: 200px;
    padding: 0.875rem 1.25rem;
    border: 1px solid var(--border);
    border-radius: 1.5rem;
    background: var(--bg-card);
    color: var(--text-primary);
    font-size: 0.9375rem;
    font-family: inherit;
    resize: none;
    outline: none;
    transition: all 0.2s cubic-bezier(0.4, 0, 0.2, 1);
    line-height: 1.5;
}

.message-input:focus {
    border-color: var(--accent-blue-light);
    box-shadow: 0 0 0 3px rgba(37, 99, 235, 0.1);
}

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

.input-hint {
    margin-top: 0.5rem;
    font-size: 0.75rem;
    color: var(--text-muted);
    text-align: center;
}

.input-hint kbd {
    padding: 0.125rem 0.375rem;
    background: var(--bg-secondary);
    border: 1px solid var(--border);
    border-radius: 0.25rem;
    font-size: 0.6875rem;
    font-family: inherit;
}

.send-button {
    width: 52px;
    height: 52px;
    border-radius: 50%;
    background: var(--accent-gradient);
    color: var(--text-light, #ffffff);
    border: none;
    display: flex;
    align-items: center;
    justify-content: center;
    cursor: pointer;
    transition: all 0.2s cubic-bezier(0.4, 0, 0.2, 1);
    flex-shrink: 0;
    box-shadow: 0 4px 15px rgba(37, 99, 235, 0.3);
}

.send-button:hover {
    box-shadow: 0 6px 25px rgba(37, 99, 235, 0.5);
    transform: translateY(-2px) scale(1.05);
}

.send-button:disabled {
    opacity: 0.5;
    cursor: not-allowed;
}

/* Thinking Panel */
.thinking-panel {
    width: 320px;
    background: var(--bg-primary);
    border-left: 1px solid var(--border);
    display: flex;
    flex-direction: column;
    flex-shrink: 0;
}

.thinking-panel.hidden {
    display: none;
}

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

.thinking-header h3 {
    font-size: 0.875rem;
    font-weight: 600;
    text-transform: uppercase;
    letter-spacing: 0.05em;
    color: var(--text-primary);
}

.close-btn {
    padding: 0.25rem;
    border-radius: 0.25rem;
    background: transparent;
    border: none;
    color: var(--text-muted);
    cursor: pointer;
    transition: all 0.2s;
}

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

.thinking-content {
    flex: 1;
    overflow-y: auto;
    padding: 1rem;
}

.thinking-step {
    padding: 1rem 1.25rem;
    border-radius: 1rem;
    background: var(--bg-secondary);
    border: 1px solid var(--border);
    margin-bottom: 0.75rem;
    transition: all 0.2s;
}

.thinking-step.processing {
    border-color: var(--text-primary);
    background: var(--bg-tertiary);
}

.thinking-step.completed {
    border-color: var(--text-primary);
    background: var(--bg-secondary);
}

.thinking-step-header {
    display: flex;
    align-items: center;
    gap: 0.75rem;
    margin-bottom: 0.5rem;
}

.thinking-step-icon {
    width: 36px;
    height: 36px;
    border-radius: 50%;
    background: var(--accent-gradient);
    display: flex;
    align-items: center;
    justify-content: center;
    color: var(--text-light, #ffffff);
    flex-shrink: 0;
    box-shadow: 0 2px 10px rgba(37, 99, 235, 0.3);
}

.thinking-step-title {
    font-size: 0.875rem;
    font-weight: 600;
    color: var(--text-primary);
    flex: 1;
}

.thinking-step-description {
    font-size: 0.8125rem;
    color: var(--text-muted);
    line-height: 1.5;
}

/* Demo Modal */
.demo-modal {
    position: fixed;
    inset: 0;
    background: rgba(0, 0, 0, 0.5);
    backdrop-filter: blur(4px);
    display: none;
    align-items: center;
    justify-content: center;
    z-index: 1000;
    padding: 1rem;
}

.demo-modal.show {
    display: flex;
}

.modal-content {
    background: var(--bg-primary);
    border-radius: 1rem;
    max-width: 28rem;
    width: 100%;
    box-shadow: 0 20px 25px -5px rgba(0, 0, 0, 0.1), 0 10px 10px -5px rgba(0, 0, 0, 0.04);
}

.modal-header {
    padding: 1.5rem;
    border-bottom: 1px solid var(--border);
    display: flex;
    align-items: center;
    justify-content: space-between;
}

.modal-header h3 {
    font-size: 1.25rem;
    font-weight: 700;
    color: var(--text-primary);
}

.modal-close {
    padding: 0.25rem;
    border-radius: 0.25rem;
    background: transparent;
    border: none;
    color: var(--text-muted);
    cursor: pointer;
    transition: all 0.2s;
}

.modal-close:hover {
    background: var(--hover);
    color: var(--text-primary);
}

.modal-body {
    padding: 1.5rem;
    color: var(--text-secondary);
    line-height: 1.7;
}

.modal-body p {
    margin-bottom: 1rem;
}

.modal-bold {
    font-weight: 600;
    color: var(--text-primary);
}

.modal-body ul {
    list-style: none;
    padding-left: 0;
}

.modal-body ul li {
    padding-left: 1.5rem;
    position: relative;
    margin-bottom: 0.5rem;
}

.modal-body ul li::before {
    content: '•';
    position: absolute;
    left: 0;
    color: var(--text-primary);
    font-weight: 600;
}

.modal-footer {
    padding: 1.5rem;
    border-top: 1px solid var(--border);
    display: flex;
    gap: 0.75rem;
}

.modal-footer .btn-primary,
.modal-footer .btn-secondary {
    flex: 1;
    padding: 0.75rem 1rem;
    border-radius: 0.5rem;
    font-weight: 600;
    text-decoration: none;
    display: inline-flex;
    align-items: center;
    justify-content: center;
    transition: all 0.2s;
    border: none;
    cursor: pointer;
    font-size: 0.9375rem;
    font-family: inherit;
}

.modal-footer .btn-primary {
    background: var(--bg-dark, #000000);
    color: var(--text-light, #ffffff);
}

.modal-footer .btn-primary:hover {
    background: #1a1a1a;
}

.modal-footer .btn-secondary {
    background: var(--bg-secondary);
    color: var(--text-primary);
    border: 1px solid var(--border);
}

.modal-footer .btn-secondary:hover {
    background: var(--hover);
}

/* Scrollbar */
.messages-container::-webkit-scrollbar,
.thinking-content::-webkit-scrollbar,
.sidebar-nav::-webkit-scrollbar {
    width: 8px;
}

.messages-container::-webkit-scrollbar-track,
.thinking-content::-webkit-scrollbar-track,
.sidebar-nav::-webkit-scrollbar-track {
    background: transparent;
}

.messages-container::-webkit-scrollbar-thumb,
.thinking-content::-webkit-scrollbar-thumb,
.sidebar-nav::-webkit-scrollbar-thumb {
    background: var(--border);
    border-radius: 4px;
}

.messages-container::-webkit-scrollbar-thumb:hover,
.thinking-content::-webkit-scrollbar-thumb:hover,
.sidebar-nav::-webkit-scrollbar-thumb:hover {
    background: var(--text-muted);
}

/* Responsive */
@media (max-width: 768px) {
    .sidebar {
        width: 64px;
    }
    
    .sidebar-nav span,
    .project-item span {
        display: none;
    }
    
    .thinking-panel {
        position: fixed;
        right: 0;
        top: 0;
        bottom: 0;
        z-index: 100;
    }
}