/* Reset and Base Styles */
*, *::before, *::after {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

:root {
    /* Centicore Brand Colors */
    --primary: #3B82F6;
    --primary-hover: #2563EB;
    --primary-light: #DBEAFE;
    --primary-dark: #1D4ED8;

    /* Neutrals */
    --bg-primary: #ffffff;
    --bg-secondary: #F8FAFC;
    --bg-tertiary: #F1F5F9;
    --text-primary: #0F172A;
    --text-secondary: #475569;
    --text-muted: #94A3B8;
    --border: #E2E8F0;
    --border-light: #F1F5F9;

    /* Status Colors */
    --success: #10B981;
    --error: #EF4444;

    /* Shadows */
    --shadow-sm: 0 1px 2px 0 rgb(0 0 0 / 0.05);
    --shadow: 0 1px 3px 0 rgb(0 0 0 / 0.1), 0 1px 2px -1px rgb(0 0 0 / 0.1);
    --shadow-md: 0 4px 6px -1px rgb(0 0 0 / 0.1), 0 2px 4px -2px rgb(0 0 0 / 0.1);
    --shadow-lg: 0 10px 15px -3px rgb(0 0 0 / 0.1), 0 4px 6px -4px rgb(0 0 0 / 0.1);

    /* Border Radius */
    --radius: 12px;
    --radius-sm: 8px;
    --radius-lg: 16px;

    /* Layout */
    --sidebar-width: 300px;
}

html, body {
    height: 100%;
    overflow: hidden;
}

body {
    font-family: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
    background-color: var(--bg-secondary);
    color: var(--text-primary);
    line-height: 1.6;
}

/* App Container */
.app-container {
    display: flex;
    height: 100vh;
    overflow: hidden;
}

/* Sidebar */
.sidebar {
    width: var(--sidebar-width);
    background: var(--bg-primary);
    border-right: 1px solid var(--border);
    display: flex;
    flex-direction: column;
    padding: 1.25rem;
    flex-shrink: 0;
}

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

.logo {
    display: flex;
    align-items: center;
}

.logo img {
    height: 44px;
    width: auto;
}

.new-chat-btn {
    width: 100%;
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 0.5rem;
    padding: 0.875rem 1rem;
    background: var(--primary);
    color: white;
    border: none;
    border-radius: var(--radius);
    font-size: 0.9375rem;
    font-weight: 600;
    cursor: pointer;
    transition: all 0.2s ease;
    font-family: inherit;
}

.new-chat-btn:hover {
    background: var(--primary-hover);
    transform: translateY(-1px);
    box-shadow: var(--shadow-md);
}

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

.sidebar-info {
    flex: 1;
    padding: 1.5rem 0;
    display: flex;
    flex-direction: column;
    gap: 0.75rem;
}

.info-card {
    display: flex;
    align-items: flex-start;
    gap: 0.75rem;
    padding: 1rem;
    background: var(--bg-secondary);
    border-radius: var(--radius-sm);
    border: 1px solid var(--border-light);
}

.info-card svg {
    color: var(--primary);
    flex-shrink: 0;
    margin-top: 2px;
}

.info-card div {
    display: flex;
    flex-direction: column;
    gap: 0.25rem;
}

.info-card strong {
    font-size: 0.875rem;
    font-weight: 600;
    color: var(--text-primary);
}

.info-card span {
    font-size: 0.75rem;
    color: var(--text-secondary);
}

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

.admin-link {
    display: flex;
    align-items: center;
    gap: 0.5rem;
    padding: 0.75rem;
    color: var(--text-secondary);
    text-decoration: none;
    font-size: 0.875rem;
    font-weight: 500;
    border-radius: var(--radius-sm);
    transition: all 0.2s ease;
}

.admin-link:hover {
    background: var(--bg-secondary);
    color: var(--primary);
}

.admin-link svg {
    transition: color 0.2s ease;
}

.admin-link:hover svg {
    color: var(--primary);
}

/* Main Chat Area */
.chat-main {
    flex: 1;
    display: flex;
    flex-direction: column;
    overflow: hidden;
    background: var(--bg-secondary);
}

.chat-messages {
    flex: 1;
    overflow-y: auto;
    padding: 2rem;
    display: flex;
    flex-direction: column;
}

/* Welcome Screen */
.welcome-screen {
    flex: 1;
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    text-align: center;
    padding: 2rem;
    max-width: 640px;
    margin: 0 auto;
}

.welcome-icon {
    width: 88px;
    height: 88px;
    background: linear-gradient(135deg, var(--primary-light), white);
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    margin-bottom: 1.5rem;
    border: 2px solid var(--primary-light);
}

.welcome-icon svg {
    color: var(--primary);
}

.welcome-screen h1 {
    font-size: 1.875rem;
    font-weight: 700;
    color: var(--text-primary);
    margin-bottom: 0.75rem;
    letter-spacing: -0.025em;
}

.welcome-screen > p {
    font-size: 1rem;
    color: var(--text-secondary);
    margin-bottom: 2.5rem;
    line-height: 1.7;
}

.example-prompts {
    display: flex;
    flex-direction: column;
    gap: 0.75rem;
    width: 100%;
    max-width: 420px;
}

.example-prompt {
    display: flex;
    align-items: center;
    gap: 0.875rem;
    padding: 1rem 1.25rem;
    background: var(--bg-primary);
    border: 1px solid var(--border);
    border-radius: var(--radius);
    font-size: 0.9375rem;
    font-weight: 500;
    color: var(--text-primary);
    cursor: pointer;
    transition: all 0.2s ease;
    text-align: left;
    font-family: inherit;
}

.example-prompt:hover {
    border-color: var(--primary);
    background: var(--primary-light);
    transform: translateY(-2px);
    box-shadow: var(--shadow);
}

.example-prompt svg {
    color: var(--primary);
    flex-shrink: 0;
}

/* Messages */
.message {
    max-width: 800px;
    width: 100%;
    margin: 0 auto 1.5rem;
    animation: fadeIn 0.3s ease;
}

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

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

.message-user .message-content {
    background: var(--primary);
    color: white;
    border-radius: var(--radius) var(--radius) 4px var(--radius);
    max-width: 70%;
}

.message-assistant {
    display: flex;
    flex-direction: column;
    align-items: flex-start;
}

.message-assistant .message-content {
    background: var(--bg-primary);
    color: var(--text-primary);
    border: 1px solid var(--border);
    border-radius: var(--radius) var(--radius) var(--radius) 4px;
    box-shadow: var(--shadow-sm);
    width: 100%;
}

.message-content {
    padding: 1rem 1.25rem;
    line-height: 1.7;
}

.message-error .message-content {
    background: #FEF2F2;
    border: 1px solid #FECACA;
    color: var(--error);
}

/* Markdown Styles */
.message-assistant .message-content h1,
.message-assistant .message-content h2,
.message-assistant .message-content h3,
.message-assistant .message-content h4 {
    margin-top: 1.25rem;
    margin-bottom: 0.5rem;
    font-weight: 600;
    color: var(--text-primary);
    letter-spacing: -0.025em;
}

.message-assistant .message-content h1:first-child,
.message-assistant .message-content h2:first-child,
.message-assistant .message-content h3:first-child,
.message-assistant .message-content h4:first-child {
    margin-top: 0;
}

.message-assistant .message-content h1 { font-size: 1.375rem; }
.message-assistant .message-content h2 { font-size: 1.25rem; }
.message-assistant .message-content h3 { font-size: 1.125rem; }
.message-assistant .message-content h4 { font-size: 1rem; }

.message-assistant .message-content p {
    margin-bottom: 0.875rem;
}

.message-assistant .message-content p:last-child {
    margin-bottom: 0;
}

.message-assistant .message-content ul,
.message-assistant .message-content ol {
    margin: 0.875rem 0;
    padding-left: 1.5rem;
}

.message-assistant .message-content li {
    margin-bottom: 0.375rem;
}

.message-assistant .message-content li:last-child {
    margin-bottom: 0;
}

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

.message-assistant .message-content code {
    background: var(--bg-tertiary);
    padding: 0.2rem 0.4rem;
    border-radius: 4px;
    font-family: 'SF Mono', Monaco, 'Courier New', monospace;
    font-size: 0.875em;
    color: var(--primary-dark);
}

.message-assistant .message-content pre {
    background: #1E293B;
    border-radius: var(--radius-sm);
    padding: 1rem;
    margin: 1rem 0;
    overflow-x: auto;
}

.message-assistant .message-content pre code {
    background: none;
    padding: 0;
    color: #E2E8F0;
    font-size: 0.875rem;
    line-height: 1.6;
}

.message-assistant .message-content blockquote {
    border-left: 3px solid var(--primary);
    padding-left: 1rem;
    margin: 1rem 0;
    color: var(--text-secondary);
    font-style: italic;
}

.message-assistant .message-content table {
    width: 100%;
    border-collapse: collapse;
    margin: 1rem 0;
    font-size: 0.9375rem;
}

.message-assistant .message-content th,
.message-assistant .message-content td {
    border: 1px solid var(--border);
    padding: 0.625rem 0.875rem;
    text-align: left;
}

.message-assistant .message-content th {
    background: var(--bg-secondary);
    font-weight: 600;
}

.message-assistant .message-content hr {
    border: none;
    border-top: 1px solid var(--border);
    margin: 1.5rem 0;
}

.message-assistant .message-content a {
    color: var(--primary);
    text-decoration: none;
    font-weight: 500;
}

.message-assistant .message-content a:hover {
    text-decoration: underline;
}

/* Sources */
.message-sources {
    margin-top: 1rem;
    padding: 1rem;
    background: var(--bg-secondary);
    border-radius: var(--radius-sm);
    font-size: 0.8125rem;
    border: 1px solid var(--border-light);
}

.message-sources-title {
    display: flex;
    align-items: center;
    gap: 0.5rem;
    font-weight: 600;
    color: var(--text-secondary);
    margin-bottom: 0.625rem;
}

.message-sources-title svg {
    width: 14px;
    height: 14px;
    color: var(--primary);
}

.message-sources ul {
    list-style: none;
    padding: 0;
    margin: 0;
}

.message-sources li {
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: 0.5rem 0;
    border-bottom: 1px solid var(--border-light);
}

.message-sources li:last-child {
    border-bottom: none;
}

.source-link {
    display: flex;
    align-items: center;
    gap: 0.375rem;
    color: var(--text-primary);
    text-decoration: none;
    transition: color 0.2s ease;
}

.source-link:hover {
    color: var(--primary);
}

.source-link:hover .source-title {
    text-decoration: underline;
}

.source-link svg {
    color: var(--text-muted);
    flex-shrink: 0;
}

.source-link:hover svg {
    color: var(--primary);
}

.source-title {
    font-weight: 500;
}

.source-relevance {
    color: var(--success);
    font-weight: 600;
    font-size: 0.75rem;
}

/* Loading Indicator */
.loading-indicator {
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 0.75rem;
    padding: 1rem;
    color: var(--text-secondary);
}

.loading-indicator.hidden {
    display: none;
}

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

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

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

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

.loading-text {
    font-size: 0.875rem;
    font-weight: 500;
}

/* Input Area */
.chat-input-wrapper {
    padding: 1rem 2rem 1.5rem;
    background: var(--bg-secondary);
}

.chat-form {
    max-width: 800px;
    margin: 0 auto;
}

.input-container {
    display: flex;
    align-items: flex-end;
    gap: 0.75rem;
    padding: 0.75rem;
    background: var(--bg-primary);
    border: 2px solid var(--border);
    border-radius: var(--radius-lg);
    box-shadow: var(--shadow);
    transition: all 0.2s ease;
}

.input-container:focus-within {
    border-color: var(--primary);
    box-shadow: var(--shadow-md), 0 0 0 3px var(--primary-light);
}

.input-container textarea {
    flex: 1;
    border: none;
    outline: none;
    resize: none;
    font-family: inherit;
    font-size: 1rem;
    line-height: 1.5;
    padding: 0.5rem;
    background: transparent;
    color: var(--text-primary);
    max-height: 150px;
}

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

.input-container button {
    width: 44px;
    height: 44px;
    display: flex;
    align-items: center;
    justify-content: center;
    background: var(--primary);
    color: white;
    border: none;
    border-radius: var(--radius);
    cursor: pointer;
    transition: all 0.2s ease;
    flex-shrink: 0;
}

.input-container button:hover {
    background: var(--primary-hover);
    transform: scale(1.05);
}

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

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

/* Responsive */
@media (max-width: 768px) {
    .sidebar {
        display: none;
    }

    .chat-messages {
        padding: 1rem;
    }

    .chat-input-wrapper {
        padding: 1rem;
    }

    .message {
        margin-bottom: 1rem;
    }

    .message-user .message-content {
        max-width: 85%;
    }

    .welcome-screen {
        padding: 1rem;
    }

    .welcome-screen h1 {
        font-size: 1.5rem;
    }

    .example-prompts {
        max-width: 100%;
    }
}

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

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

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

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