/* AI-Assisted Business Analysis Companion Website
   Clean, professional design with Azure theme */

:root {
    /* Azure theme colors */
    --vt-maroon: #0078D4;
    --vt-orange: #50E6FF;
    --vt-maroon-light: #2B88D8;

    /* Neutrals */
    --white: #ffffff;
    --gray-50: #f9fafb;
    --gray-100: #f3f4f6;
    --gray-200: #e5e7eb;
    --gray-300: #d1d5db;
    --gray-600: #4b5563;
    --gray-800: #1f2937;
    --gray-900: #111827;

    /* Spacing */
    --space-xs: 0.25rem;
    --space-sm: 0.5rem;
    --space-md: 1rem;
    --space-lg: 1.5rem;
    --space-xl: 2rem;
    --space-2xl: 3rem;
    --space-3xl: 4rem;

    /* Typography */
    --font-sans: system-ui, -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, 'Helvetica Neue', Arial, sans-serif;
    --font-mono: ui-monospace, SFMono-Regular, 'SF Mono', Menlo, Consolas, monospace;
}

/* Reset */
*,
*::before,
*::after {
    box-sizing: border-box;
}

html {
    scroll-behavior: smooth;
}

body {
    margin: 0;
    font-family: var(--font-sans);
    font-size: 16px;
    line-height: 1.6;
    color: var(--gray-800);
    background: var(--white);
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
}

main {
    animation: fadeIn 0.3s ease-out;
}

@keyframes fadeIn {
    from {
        opacity: 0;
        transform: translateY(8px);
    }

    to {
        opacity: 1;
        transform: translateY(0);
    }
}

h1,
h2,
h3,
h4,
h5,
h6 {
    margin: 0 0 var(--space-md);
    line-height: 1.3;
    color: var(--gray-900);
}

p {
    margin: 0 0 var(--space-md);
}

a {
    color: var(--vt-maroon);
    text-decoration: none;
}

a:hover {
    text-decoration: underline;
    color: var(--vt-maroon-light);
}

a:focus-visible {
    outline: 2px solid var(--vt-maroon);
    outline-offset: 2px;
    border-radius: 2px;
}

/* Container */
.container {
    max-width: 1100px;
    margin: 0 auto;
    padding: 0 var(--space-lg);
}

/* Header */
header {
    background: linear-gradient(135deg, #0078D4 0%, #005a9e 100%);
    color: var(--white);
    padding: var(--space-lg) 0;
}

.header-brand {
    text-align: center;
}

.header-brand h1 {
    color: var(--white);
    font-size: 1.75rem;
    margin: 0 0 var(--space-xs);
}

.vt-logo {
    display: block;
    height: 3.5rem;
    width: auto;
    margin: 0 auto var(--space-sm);
}

.header-brand .subtitle {
    margin: 0;
    opacity: 0.9;
    font-size: 1rem;
}

/* Hero */
.hero {
    padding: var(--space-2xl) 0;
    border-bottom: 1px solid var(--gray-200);
}

.hero .lead {
    font-size: 1.25rem;
    color: var(--gray-600);
    max-width: 800px;
}

.hero blockquote {
    margin: var(--space-xl) 0 0;
    padding: var(--space-md) var(--space-lg);
    border-left: 4px solid var(--vt-maroon);
    background: #f0f8ff;
    font-size: 1.1rem;
    font-style: italic;
    color: var(--gray-800);
}

/* Sections */
section {
    padding: var(--space-2xl) 0;
}

section h2 {
    font-size: 1.5rem;
    color: var(--vt-maroon);
    margin-bottom: var(--space-xl);
    padding-bottom: var(--space-sm);
    border-bottom: 2px solid var(--gray-200);
    position: relative;
}

section h2::after {
    content: '';
    position: absolute;
    bottom: -2px;
    left: 0;
    width: 60px;
    height: 2px;
    background: var(--vt-maroon);
}

/* Instructors */
.instructor-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
    gap: var(--space-xl);
}

.instructor-card {
    background: var(--gray-50);
    border-radius: 8px;
    padding: var(--space-xl);
    border: 1px solid var(--gray-200);
}

.instructor-card h3 {
    color: var(--vt-maroon);
    margin-bottom: var(--space-xs);
}

.instructor-card .title {
    color: var(--gray-600);
    font-size: 0.95rem;
    margin-bottom: var(--space-xs);
}

.instructor-card .role {
    display: inline-block;
    background: var(--vt-maroon);
    color: var(--white);
    padding: var(--space-xs) var(--space-sm);
    border-radius: 4px;
    font-size: 0.85rem;
    font-weight: 500;
    margin-bottom: var(--space-md);
}

.instructor-card p {
    margin: var(--space-sm) 0 0;
}

/* Materials */
.material-category {
    margin-bottom: var(--space-xl);
}

.material-category h3 {
    font-size: 1.1rem;
    color: var(--gray-800);
    margin-bottom: var(--space-sm);
}

.subsection-title {
    font-size: 0.95rem;
    color: var(--gray-600);
    margin: var(--space-lg) 0 var(--space-sm) 0;
    font-weight: 600;
}

.badge {
    display: inline-block;
    background: var(--vt-maroon);
    color: var(--white);
    font-size: 0.7rem;
    font-weight: 500;
    padding: 2px 8px;
    border-radius: 12px;
    margin-left: var(--space-sm);
    vertical-align: middle;
}

.badge-reference {
    background: #005a9e;
}

.section-description {
    color: var(--gray-600);
    font-size: 0.95rem;
    margin: 0 0 var(--space-md) 0;
    line-height: 1.5;
}

.material-list {
    list-style: none;
    padding: 0;
    margin: 0;
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(320px, 1fr));
    gap: var(--space-sm);
}

.material-list li {
    background: var(--gray-50);
    border: 1px solid var(--gray-200);
    border-radius: 6px;
    transition: all 0.2s ease;
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: var(--space-md);
}

.material-list li:hover {
    border-color: var(--vt-maroon);
    background: var(--white);
    box-shadow: 0 2px 8px rgba(0, 120, 212, 0.12);
}

.material-list .material-title {
    color: var(--gray-800);
    flex: 1;
}

.material-list .format-icons {
    display: flex;
    gap: var(--space-sm);
    margin-left: var(--space-md);
}

.material-list .format-icon {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    width: 32px;
    height: 32px;
    border-radius: 4px;
    font-size: 0.75rem;
    font-weight: 600;
    text-decoration: none;
    transition: all 0.15s ease;
}

.material-list .format-icon.pdf {
    background: #fef2f2;
    color: #991b1b;
    border: 1px solid #fecaca;
}

.material-list .format-icon.pdf:hover {
    background: #fecaca;
    text-decoration: none;
}

.material-list .format-icon.docx {
    background: #eff6ff;
    color: #1e40af;
    border: 1px solid #bfdbfe;
}

.material-list .format-icon.docx:hover {
    background: #dbeafe;
    text-decoration: none;
}

.material-list .format-icon.csv {
    background: #f0fdf4;
    color: #166534;
    border: 1px solid #bbf7d0;
}

.material-list .format-icon.csv:hover {
    background: #dcfce7;
    text-decoration: none;
}

.material-list .format-icon.html {
    background: #faf5ff;
    color: #6b21a8;
    border: 1px solid #e9d5ff;
    width: auto;
    padding: 0 12px;
}

.material-list .format-icon.html:hover {
    background: #e9d5ff;
    text-decoration: none;
}

/* Legacy single-link support (for data files) */
.material-list a:not(.format-icon) {
    display: block;
    padding: 0;
    color: var(--gray-800);
}

.material-list a:not(.format-icon)::before {
    content: '';
}

.material-list a:not(.format-icon):hover {
    color: var(--vt-maroon);
    text-decoration: none;
}

/* Data files list styling */
.material-list.data-files {
    margin-top: var(--space-sm);
    margin-bottom: var(--space-lg);
}

.material-list.data-files li {
    background: var(--white);
    border: 1px dashed var(--gray-300);
    padding: var(--space-sm) var(--space-md);
    display: flex;
    align-items: center;
    gap: var(--space-sm);
}

.material-list.data-files .material-title {
    flex: 1;
    font-family: var(--font-mono);
    font-size: 0.9rem;
}

.material-list.data-files a::before {
    content: '';
}

.file-meta {
    font-size: 0.75rem;
    color: var(--gray-600);
    font-family: var(--font-mono);
    white-space: nowrap;
}

/* Session Plan Section */
.session-plan-section {
    background: #f0f8ff;
    border: 1px solid #b3d7f7;
    border-radius: 12px;
    padding: var(--space-xl);
    margin-bottom: var(--space-xl);
}

/* Assessment Section */
.assessment {
    background: linear-gradient(135deg, var(--gray-50) 0%, #fff 100%);
    padding: var(--space-xl);
    border-radius: 12px;
    margin: var(--space-xl) 0;
    border: 1px solid var(--gray-200);
}

.assessment h2 {
    color: var(--vt-maroon);
    margin-bottom: var(--space-md);
}

.section-intro {
    color: var(--gray-700);
    font-size: 1.05rem;
    line-height: 1.6;
    margin-bottom: var(--space-lg);
}

.assessment-cards {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
    gap: var(--space-lg);
    margin-bottom: var(--space-lg);
}

.assessment-card {
    background: var(--white);
    padding: var(--space-lg);
    border-radius: 8px;
    text-align: center;
    border: 2px solid var(--gray-200);
    transition: all 0.2s ease;
}

.assessment-card:hover {
    border-color: var(--vt-maroon);
    box-shadow: 0 4px 12px rgba(0, 120, 212, 0.15);
}

.assessment-card h3 {
    color: var(--gray-800);
    margin-bottom: var(--space-sm);
}

.assessment-card p {
    color: var(--gray-600);
    font-size: 0.9rem;
    margin-bottom: var(--space-md);
}

.btn {
    display: inline-block;
    padding: 12px 24px;
    border-radius: 6px;
    text-decoration: none;
    font-weight: 600;
    transition: all 0.2s ease;
}

.btn-primary {
    background: var(--vt-maroon);
    color: var(--white);
}

.btn-primary:hover {
    background: #005a9e;
    color: var(--white);
}

.btn-secondary {
    background: var(--gray-100);
    color: var(--gray-700);
    border: 1px solid var(--gray-300);
}

.btn-secondary:hover {
    background: var(--gray-200);
    color: var(--gray-800);
}

.time-estimate {
    display: block;
    margin-top: var(--space-sm);
    color: var(--gray-500);
    font-size: 0.85rem;
}

.research-note {
    color: var(--gray-600);
    font-size: 0.9rem;
    font-style: italic;
    text-align: center;
    margin: 0;
}

/* Learning Objectives */
.objectives-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: var(--space-lg);
}



/* Site Navigation */
.site-nav {
    background: var(--gray-50);
    border-bottom: 1px solid var(--gray-200);
    padding: var(--space-sm) 0;
    position: sticky;
    top: 0;
    z-index: 100;
}

.site-nav .container {
    display: flex;
    align-items: center;
    gap: var(--space-md);
    overflow-x: auto;
    -webkit-overflow-scrolling: touch;
    scrollbar-width: none;
}

.site-nav .container::-webkit-scrollbar {
    display: none;
}

.site-nav a {
    color: var(--gray-600);
    font-size: 0.85rem;
    font-weight: 500;
    white-space: nowrap;
    padding: var(--space-xs) var(--space-sm);
    border-radius: 4px;
    transition: all 0.15s ease;
}

.site-nav a:hover {
    color: var(--vt-maroon);
    background: var(--white);
    text-decoration: none;
}

.site-nav a.active {
    color: var(--vt-maroon);
    background: var(--white);
    border: 1px solid var(--gray-200);
    font-weight: 600;
}

.objective {
    background: var(--gray-50);
    border-radius: 8px;
    padding: var(--space-lg);
    border: 1px solid var(--gray-200);
}

.objective-icon {
    font-size: 2rem;
    display: block;
    margin-bottom: var(--space-sm);
}

.objective h4 {
    color: var(--vt-maroon);
    font-size: 1rem;
    margin-bottom: var(--space-sm);
}

.objective p {
    color: var(--gray-600);
    font-size: 0.95rem;
    margin: 0;
}

/* Material Navigation Cards (homepage) */
.material-nav-cards {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(220px, 1fr));
    gap: var(--space-md);
    margin-top: var(--space-lg);
}

.material-nav-card {
    display: flex;
    align-items: center;
    gap: var(--space-md);
    padding: var(--space-lg);
    background: var(--gray-50);
    border: 1px solid var(--gray-200);
    border-radius: 10px;
    text-decoration: none !important;
    color: inherit;
    transition: all 0.2s ease;
}

.material-nav-card:hover {
    border-color: var(--vt-maroon);
    background: var(--white);
    box-shadow: 0 4px 12px rgba(0, 120, 212, 0.12);
    transform: translateY(-2px);
}

.material-nav-icon {
    font-size: 1.8rem;
    flex-shrink: 0;
}

.material-nav-card strong {
    display: block;
    color: var(--gray-900);
    font-size: 1rem;
    margin-bottom: 2px;
}

.material-nav-card:hover strong {
    color: var(--vt-maroon);
}

.material-nav-card span {
    color: var(--gray-600);
    font-size: 0.85rem;
}

/* Schedule Table */
.schedule-table {
    width: 100%;
    border-collapse: collapse;
    margin-top: var(--space-md);
    font-size: 0.9rem;
}

.schedule-table th,
.schedule-table td {
    padding: var(--space-sm) var(--space-md);
    text-align: left;
    border-bottom: 1px solid var(--gray-200);
}

.schedule-table th {
    background: var(--gray-50);
    font-weight: 600;
    color: var(--gray-700);
}

.schedule-table td:first-child {
    width: 60px;
    font-weight: 600;
    color: var(--vt-maroon);
}

/* Dataset Quick Cards */
.dataset-cards {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(160px, 1fr));
    gap: var(--space-sm);
    margin-bottom: var(--space-md);
}

.dataset-card {
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 4px;
    padding: var(--space-md) var(--space-sm);
    background: var(--gray-50);
    border: 1px solid var(--gray-200);
    border-radius: 8px;
    text-decoration: none !important;
    text-align: center;
    transition: all 0.2s ease;
}

.dataset-card:hover {
    border-color: var(--vt-maroon);
    background: var(--white);
    box-shadow: 0 2px 8px rgba(0, 120, 212, 0.12);
}

.dataset-card strong {
    color: var(--gray-900);
    font-size: 0.9rem;
}

.dataset-card span {
    color: var(--gray-600);
    font-size: 0.75rem;
}

/* Footer */
footer {
    background: var(--gray-900);
    color: var(--gray-300);
    padding: var(--space-2xl) 0;
    text-align: center;
    margin-top: var(--space-2xl);
}

footer p {
    margin: var(--space-sm) 0;
    font-size: 0.9rem;
}

.footer-links {
    margin-top: var(--space-sm) !important;
}

.footer-links a {
    color: var(--gray-300);
    transition: color 0.15s ease;
}

.footer-links a:hover {
    color: var(--white);
    text-decoration: none;
}

/* Responsive */
@media (max-width: 768px) {
    .header-brand h1 {
        font-size: 1.4rem;
    }

    .hero .lead {
        font-size: 1.1rem;
    }

    section h2 {
        font-size: 1.3rem;
    }

    .material-list {
        grid-template-columns: 1fr;
    }

    .site-nav .container {
        gap: var(--space-sm);
        padding: 0 var(--space-md);
    }

    .site-nav a {
        font-size: 0.8rem;
        padding: var(--space-xs) 6px;
    }

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

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

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

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

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

@media (max-width: 480px) {
    .material-nav-cards {
        grid-template-columns: 1fr;
    }

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

/* Print styles */
@media print {
    header {
        background: none;
        color: var(--gray-900);
        border-bottom: 2px solid var(--vt-maroon);
    }

    .header-brand h1 {
        color: var(--vt-maroon);
    }

    .vt-logo g {
        fill: var(--vt-maroon);
    }

    footer {
        display: none;
    }
}