/* Global Variables */
:root {
    --primary-color: #0674bb;
    --primary-dark: #055a96;
    --background: #F9FAFB;
    --card-bg: #FFFFFF;
    --text-dark: #111827;
    --text-medium: #4B5563;
    --text-light: #6B7280;
    --border-color: #E5E7EB;
    --shadow-sm: 0 1px 2px 0 rgba(0, 0, 0, 0.05);
    --shadow-md: 0 4px 6px -1px rgba(0, 0, 0, 0.1);
    --shadow-lg: 0 10px 15px -3px rgba(0, 0, 0, 0.1);
}

/* Reset & Base */
* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

body {
    font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, Oxygen, Ubuntu, Cantarell, sans-serif;
    background-color: var(--background);
    color: var(--text-dark);
    line-height: 1.6;
    min-height: 100vh;
    display: flex;
    flex-direction: column;
}

/* Header */
.header {
    background-color: var(--card-bg);
    border-bottom: 1px solid var(--border-color);
    box-shadow: var(--shadow-sm);
    position: sticky;
    top: 0;
    z-index: 1000;
}

.header-container {
    max-width: 1400px;
    margin: 0 auto;
    padding: 1rem 2rem;
    display: flex;
    align-items: center;
    justify-content: space-between;
}

.logo {
    display: flex;
    align-items: center;
    gap: 0.75rem;
    font-size: 1.25rem;
    font-weight: 600;
    color: var(--text-dark);
}

.logo img {
    height: 40px;
    width: auto;
}

/* Main Navigation */
.main-nav {
    display: flex;
    gap: 0.5rem;
}

.nav-link {
    padding: 0.5rem 1rem;
    color: var(--text-medium);
    text-decoration: none;
    border-radius: 6px;
    transition: all 0.2s;
    font-weight: 500;
}

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

.nav-link.active {
    background-color: var(--primary-color);
    color: white;
}

/* Submenu Tabs */
.submenu {
    background-color: var(--card-bg);
    border-bottom: 1px solid var(--border-color);
    padding: 0 2rem;
}

.submenu-container {
    max-width: 1400px;
    margin: 0 auto;
    display: flex;
    gap: 2rem;
}

.tab-link {
    padding: 1rem 0;
    color: var(--text-medium);
    text-decoration: none;
    border-bottom: 2px solid transparent;
    transition: all 0.2s;
    font-weight: 500;
}

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

.tab-link.active {
    color: var(--primary-color);
    border-bottom-color: var(--primary-color);
}

/* Main Content */
.main-content {
    flex: 1;
    padding: 2rem;
}

.container {
    max-width: 1400px;
    margin: 0 auto;
}

/* Breadcrumb Navigation */
.breadcrumb {
    display: flex;
    align-items: center;
    gap: 0.5rem;
    font-size: 0.875rem;
    color: var(--text-medium);
    margin-bottom: 1.5rem;
    padding: 0.5rem 0;
}

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

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

.breadcrumb-separator {
    color: var(--text-light);
    user-select: none;
}

.breadcrumb-current {
    color: var(--text-dark);
    font-weight: 500;
}

h1 {
    font-size: 2.5rem;
    margin-bottom: 0.5rem;
    color: var(--text-dark);
}

.subtitle {
    font-size: 1.25rem;
    color: var(--text-medium);
    margin-bottom: 2rem;
}

/* Cards Grid */
.cards-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(300px, 1fr));
    gap: 1.5rem;
    margin-top: 2rem;
}

.card {
    background-color: var(--card-bg);
    border: 1px solid var(--border-color);
    border-radius: 8px;
    padding: 1.5rem;
    text-decoration: none;
    color: var(--text-dark);
    transition: all 0.2s;
    box-shadow: var(--shadow-sm);
}

.card:hover {
    box-shadow: var(--shadow-md);
    transform: translateY(-2px);
    border-color: var(--primary-color);
}

.card h2 {
    font-size: 1.5rem;
    margin-bottom: 0.5rem;
    color: var(--primary-color);
}

.card p {
    color: var(--text-medium);
}

/* Tab Content */
.tab-content {
    display: none;
    padding: 2rem;
    background-color: var(--card-bg);
    border-radius: 8px;
    margin-top: 1rem;
    box-shadow: var(--shadow-sm);
}

.tab-content.active {
    display: block;
}

/* Chat Interface */
.chat-container {
    display: flex;
    flex-direction: column;
    height: 600px;
    border: 1px solid var(--border-color);
    border-radius: 8px;
    overflow: hidden;
}

.chat-messages {
    flex: 1;
    padding: 1.5rem;
    overflow-y: auto;
    display: flex;
    flex-direction: column;
    gap: 1rem;
}

.message {
    padding: 0.75rem 1rem;
    border-radius: 8px;
    max-width: 80%;
}

.message.user {
    background-color: var(--primary-color);
    color: white;
    align-self: flex-end;
}

.message.assistant {
    background-color: var(--background);
    color: var(--text-dark);
    align-self: flex-start;
    line-height: 1.4;
}

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

.message.assistant h3 {
    font-size: 1.1rem;
    font-weight: 600;
    margin: 0.5rem 0 0.25rem 0;
    color: var(--primary-color);
}

.message.assistant ul,
.message.assistant ol {
    margin: 0.25rem 0;
    padding-left: 1.5rem;
}

.message.assistant li {
    margin: 0.1rem 0;
}

.message.assistant a {
    color: var(--primary-color);
    text-decoration: underline;
}

.message.assistant a:hover {
    color: var(--primary-dark);
}

.chat-input-container {
    padding: 1rem;
    border-top: 1px solid var(--border-color);
    display: flex;
    gap: 0.5rem;
}

.chat-input {
    flex: 1;
    padding: 0.75rem;
    border: 1px solid var(--border-color);
    border-radius: 6px;
    font-size: 1rem;
}

.chat-input:focus {
    outline: none;
    border-color: var(--primary-color);
}

/* Buttons */
.btn {
    padding: 0.75rem 1.5rem;
    background-color: var(--primary-color);
    color: white;
    border: none;
    border-radius: 6px;
    font-size: 1rem;
    font-weight: 500;
    cursor: pointer;
    transition: all 0.2s;
}

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

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

/* Documentation */
.docs-list {
    display: flex;
    flex-direction: column;
    gap: 1rem;
}

.doc-link {
    display: block;
    padding: 1rem;
    background-color: var(--card-bg);
    border: 1px solid var(--border-color);
    border-radius: 6px;
    text-decoration: none;
    color: var(--text-dark);
    transition: all 0.2s;
}

.doc-link:hover {
    border-color: var(--primary-color);
    box-shadow: var(--shadow-sm);
}

.doc-link h3 {
    color: var(--primary-color);
    margin-bottom: 0.25rem;
}

/* Video Player */
.video-container {
    margin: 2rem 0;
}

.video-player {
    width: 100%;
    max-width: 800px;
    border-radius: 8px;
    box-shadow: var(--shadow-md);
}

/* Footer */
.footer {
    background-color: var(--card-bg);
    border-top: 1px solid var(--border-color);
    padding: 2rem;
    margin-top: auto;
}

.footer p {
    text-align: center;
    color: var(--text-medium);
}

/* Loading State */
.loading {
    text-align: center;
    padding: 2rem;
    color: var(--text-medium);
}

/* Error State */
.error {
    padding: 1rem;
    background-color: #FEE2E2;
    border: 1px solid #EF4444;
    border-radius: 6px;
    color: #991B1B;
}

/* Mobile Responsive */
@media (max-width: 768px) {
    .header-container {
        padding: 1rem;
        flex-direction: column;
        gap: 1rem;
    }

    .main-nav {
        flex-wrap: wrap;
        justify-content: center;
    }

    .submenu-container {
        padding: 0 1rem;
    }

    .main-content {
        padding: 1rem;
    }

    h1 {
        font-size: 2rem;
    }

    .cards-grid {
        grid-template-columns: 1fr;
    }

    .message {
        max-width: 90%;
    }
}