/* Modern Training Materials CSS Framework */
/* Enterprise-grade design system for training content */

:root {
    /* Color System */
    --primary-50: #eff6ff;
    --primary-100: #dbeafe;
    --primary-200: #bfdbfe;
    --primary-300: #93c5fd;
    --primary-400: #60a5fa;
    --primary-500: #3b82f6;
    --primary-600: #2563eb;
    --primary-700: #1d4ed8;
    --primary-800: #1e40af;
    --primary-900: #1e3a8a;
    
    /* Semantic Colors */
    --success-50: #ecfdf5;
    --success-500: #10b981;
    --success-600: #059669;
    
    --warning-50: #fffbeb;
    --warning-500: #f59e0b;
    --warning-600: #d97706;
    
    --error-50: #fef2f2;
    --error-500: #ef4444;
    --error-600: #dc2626;
    
    /* Neutral Colors */
    --gray-50: #f9fafb;
    --gray-100: #f3f4f6;
    --gray-200: #e5e7eb;
    --gray-300: #d1d5db;
    --gray-400: #9ca3af;
    --gray-500: #6b7280;
    --gray-600: #4b5563;
    --gray-700: #374151;
    --gray-800: #1f2937;
    --gray-900: #111827;
    
    /* Typography */
    --font-family-sans: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
    --font-family-mono: 'JetBrains Mono', 'Fira Code', Consolas, monospace;
    
    /* Font Sizes */
    --text-xs: 0.75rem;
    --text-sm: 0.875rem;
    --text-base: 1rem;
    --text-lg: 1.125rem;
    --text-xl: 1.25rem;
    --text-2xl: 1.5rem;
    --text-3xl: 1.875rem;
    --text-4xl: 2.25rem;
    --text-5xl: 3rem;
    
    /* Spacing */
    --space-1: 0.25rem;
    --space-2: 0.5rem;
    --space-3: 0.75rem;
    --space-4: 1rem;
    --space-5: 1.25rem;
    --space-6: 1.5rem;
    --space-8: 2rem;
    --space-10: 2.5rem;
    --space-12: 3rem;
    --space-16: 4rem;
    --space-20: 5rem;
    --space-24: 6rem;
    
    /* Border Radius */
    --radius-sm: 0.125rem;
    --radius-md: 0.375rem;
    --radius-lg: 0.5rem;
    --radius-xl: 0.75rem;
    --radius-2xl: 1rem;
    --radius-3xl: 1.5rem;
    
    /* Shadows */
    --shadow-sm: 0 1px 2px 0 rgb(0 0 0 / 0.05);
    --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);
    --shadow-xl: 0 20px 25px -5px rgb(0 0 0 / 0.1), 0 8px 10px -6px rgb(0 0 0 / 0.1);
    --shadow-2xl: 0 25px 50px -12px rgb(0 0 0 / 0.25);
    
    /* Transitions */
    --transition-fast: 150ms cubic-bezier(0.4, 0, 0.2, 1);
    --transition-normal: 300ms cubic-bezier(0.4, 0, 0.2, 1);
    --transition-slow: 500ms cubic-bezier(0.4, 0, 0.2, 1);
    
    /* Z-Index Scale */
    --z-dropdown: 1000;
    --z-sticky: 1020;
    --z-fixed: 1030;
    --z-modal-backdrop: 1040;
    --z-modal: 1050;
    --z-popover: 1060;
    --z-tooltip: 1070;
}

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

body {
    font-family: var(--font-family-sans);
    line-height: 1.6;
    color: var(--gray-800);
    background-color: var(--gray-50);
    margin: 0;
    padding: 0;
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
}

/* Modern Page Header */
.modern-page-header {
    background: linear-gradient(135deg, var(--primary-600) 0%, var(--primary-800) 100%);
    color: white;
    padding: var(--space-12) var(--space-6);
    position: relative;
    overflow: hidden;
    margin: var(--space-6) var(--space-4);
    border-radius: var(--radius-3xl);
    box-shadow: var(--shadow-2xl);
    backdrop-filter: blur(20px);
    border: 1px solid rgba(255, 255, 255, 0.1);
}

.modern-page-header::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: url('data:image/svg+xml,<svg xmlns="http://www.w3.org/2000/svg" viewBox="0 0 100 100"><defs><pattern id="grain" width="100" height="100" patternUnits="userSpaceOnUse"><circle cx="50" cy="50" r="1" fill="white" opacity="0.1"/></pattern></defs><rect width="100" height="100" fill="url(%23grain)"/></svg>');
    opacity: 0.1;
    border-radius: inherit;
}

.modern-page-header::after {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: linear-gradient(45deg, rgba(255, 255, 255, 0.1) 0%, transparent 50%, rgba(255, 255, 255, 0.05) 100%);
    border-radius: inherit;
    pointer-events: none;
}

/* Responsive adjustments for modern page header */
@media (max-width: 768px) {
    .modern-page-header {
        margin: var(--space-4) var(--space-2);
        border-radius: var(--radius-2xl);
        padding: var(--space-12) var(--space-6);
    }
    
    .modern-page-title {
        font-size: var(--text-3xl);
    }
    
    .modern-page-subtitle {
        font-size: var(--text-lg);
    }
    
    .modern-page-description {
        font-size: var(--text-base);
    }
}

@media (max-width: 480px) {
    .modern-page-header {
        margin: var(--space-3) var(--space-1);
        border-radius: var(--radius-xl);
        padding: var(--space-10) var(--space-4);
    }
    
    .modern-page-title {
        font-size: var(--text-2xl);
    }
}

.modern-page-header .container {
    position: relative;
    z-index: 1;
}

.modern-page-title {
    font-size: var(--text-4xl);
    font-weight: 700;
    margin-bottom: var(--space-3);
    line-height: 1.2;
}

.modern-page-subtitle {
    font-size: var(--text-xl);
    opacity: 0.9;
    margin-bottom: var(--space-4);
    font-weight: 500;
}

.modern-page-description {
    font-size: var(--text-lg);
    opacity: 0.8;
    line-height: 1.6;
    max-width: 600px;
}

/* Material Info Cards */
.modern-material-info {
    display: flex;
    flex-direction: column;
    gap: var(--space-4);
}

.modern-info-badges {
    display: flex;
    gap: var(--space-3);
    flex-wrap: wrap;
}

.modern-info-badge {
    display: inline-flex;
    align-items: center;
    gap: var(--space-2);
    background: rgba(255, 255, 255, 0.2);
    backdrop-filter: blur(10px);
    padding: var(--space-2) var(--space-4);
    border-radius: var(--radius-xl);
    font-size: var(--text-sm);
    font-weight: 500;
    border: 1px solid rgba(255, 255, 255, 0.3);
}

.modern-download-btn {
    display: inline-flex;
    align-items: center;
    gap: var(--space-2);
    background: white;
    color: var(--primary-600);
    padding: var(--space-3) var(--space-6);
    border-radius: var(--radius-xl);
    text-decoration: none;
    font-weight: 600;
    font-size: var(--text-sm);
    transition: all var(--transition-fast);
    box-shadow: var(--shadow-md);
    border: none;
    cursor: pointer;
}

.modern-download-btn:hover {
    background: var(--gray-50);
    transform: translateY(-2px);
    box-shadow: var(--shadow-lg);
    color: var(--primary-700);
}

/* Modern Breadcrumb */
.modern-breadcrumb-section {
    background: white;
    border-bottom: 1px solid var(--gray-200);
    padding: var(--space-4) 0;
}

.modern-breadcrumb {
    display: flex;
    align-items: center;
    gap: var(--space-2);
    font-size: var(--text-sm);
    margin: 0;
    padding: 0;
    list-style: none;
}

.modern-breadcrumb-item {
    display: flex;
    align-items: center;
    gap: var(--space-2);
}

.modern-breadcrumb-item:not(:last-child)::after {
    content: '/';
    color: var(--gray-400);
    font-weight: 300;
}

.modern-breadcrumb-link {
    color: var(--gray-600);
    text-decoration: none;
    transition: color var(--transition-fast);
}

.modern-breadcrumb-link:hover {
    color: var(--primary-600);
}

.modern-breadcrumb-current {
    color: var(--gray-900);
    font-weight: 500;
}

/* Content Layout */
.modern-content-layout {
    padding: var(--space-12) 0;
    min-height: 60vh;
}

.modern-content-grid {
    display: grid;
    grid-template-columns: 1fr 300px;
    gap: var(--space-8);
    align-items: start;
}

/* Accordion System */
.modern-accordion {
    background: white;
    border-radius: var(--radius-2xl);
    box-shadow: var(--shadow-md);
    overflow: hidden;
    margin-bottom: var(--space-6);
}

.modern-accordion-item {
    border-bottom: 1px solid var(--gray-200);
}

.modern-accordion-item:last-child {
    border-bottom: none;
}

.modern-accordion-header {
    background: var(--gray-50);
    padding: var(--space-6);
    cursor: pointer;
    transition: all var(--transition-fast);
    border: none;
    width: 100%;
    text-align: left;
    display: flex;
    align-items: center;
    justify-content: space-between;
    position: relative;
    gap: var(--space-4);
}

.modern-accordion-header:hover {
    background: var(--gray-100);
}

.modern-accordion-header.active {
    background: var(--primary-50);
    color: var(--primary-700);
}

.modern-accordion-title {
    display: flex;
    align-items: center;
    gap: var(--space-3);
    font-size: var(--text-xl);
    font-weight: 600;
    margin: 0;
    flex: 1;
    min-width: 0;
}

.modern-accordion-icon {
    font-size: var(--text-lg);
    color: var(--primary-500);
}

.modern-accordion-chevron {
    font-size: var(--text-lg);
    transition: transform var(--transition-fast);
    color: var(--gray-500);
    flex-shrink: 0;
    margin-left: auto;
    display: flex;
    align-items: center;
    justify-content: center;
    width: 24px;
    height: 24px;
}

.modern-accordion-header.active .modern-accordion-chevron {
    transform: rotate(180deg);
    color: var(--primary-600);
}

.modern-accordion-content {
    padding: 0 var(--space-6);
    max-height: 0;
    overflow: hidden;
    transition: all var(--transition-normal);
}

.modern-accordion-content.active {
    padding: var(--space-6);
    max-height: 2000px;
}

.modern-accordion-body {
    font-size: var(--text-base);
    line-height: 1.7;
    color: var(--gray-700);
}

/* Card Components */
.modern-card {
    background: white;
    border-radius: var(--radius-xl);
    box-shadow: var(--shadow-md);
    overflow: hidden;
    transition: all var(--transition-fast);
}

.modern-card:hover {
    box-shadow: var(--shadow-lg);
    transform: translateY(-2px);
}

.modern-card-header {
    background: linear-gradient(135deg, var(--primary-500) 0%, var(--primary-600) 100%);
    color: white;
    padding: var(--space-5);
    display: flex;
    align-items: center;
    gap: var(--space-3);
}

.modern-card-title {
    font-size: var(--text-lg);
    font-weight: 600;
    margin: 0;
}

.modern-card-body {
    padding: var(--space-6);
}

.modern-card-footer {
    background: var(--gray-50);
    padding: var(--space-4) var(--space-6);
    border-top: 1px solid var(--gray-200);
}

/* Progress Cards */
.modern-progress-card {
    background: white;
    border-radius: var(--radius-xl);
    box-shadow: var(--shadow-md);
    padding: var(--space-6);
    margin-bottom: var(--space-4);
    position: relative;
    overflow: hidden;
}

.modern-progress-card::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    width: 4px;
    height: 100%;
    background: var(--primary-500);
}

.modern-progress-header {
    display: flex;
    align-items: center;
    gap: var(--space-3);
    margin-bottom: var(--space-4);
}

.modern-progress-number {
    display: flex;
    align-items: center;
    justify-content: center;
    width: 40px;
    height: 40px;
    background: var(--primary-100);
    color: var(--primary-700);
    border-radius: var(--radius-lg);
    font-weight: 700;
    font-size: var(--text-lg);
}

.modern-progress-title {
    font-size: var(--text-lg);
    font-weight: 600;
    color: var(--gray-800);
    margin: 0;
}

.modern-progress-content {
    color: var(--gray-600);
    line-height: 1.6;
}

/* Feature Grid */
.modern-feature-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: var(--space-6);
    margin: var(--space-8) 0;
}

.modern-feature-card {
    background: white;
    border-radius: var(--radius-xl);
    padding: var(--space-6);
    box-shadow: var(--shadow-md);
    transition: all var(--transition-fast);
    border: 1px solid var(--gray-200);
}

.modern-feature-card:hover {
    box-shadow: var(--shadow-lg);
    transform: translateY(-4px);
    border-color: var(--primary-300);
}

.modern-feature-icon {
    display: flex;
    align-items: center;
    justify-content: center;
    width: 60px;
    height: 60px;
    background: var(--primary-100);
    color: var(--primary-600);
    border-radius: var(--radius-xl);
    font-size: var(--text-2xl);
    margin-bottom: var(--space-4);
}

.modern-feature-title {
    font-size: var(--text-xl);
    font-weight: 600;
    color: var(--gray-800);
    margin-bottom: var(--space-3);
}

.modern-feature-description {
    color: var(--gray-600);
    line-height: 1.6;
}

/* List Components */
.modern-list {
    list-style: none;
    padding: 0;
    margin: 0;
}

.modern-list-item {
    display: flex;
    align-items: flex-start;
    gap: var(--space-3);
    padding: var(--space-4);
    background: white;
    border-radius: var(--radius-lg);
    margin-bottom: var(--space-3);
    box-shadow: var(--shadow-sm);
    transition: all var(--transition-fast);
}

.modern-list-item:hover {
    box-shadow: var(--shadow-md);
    transform: translateX(4px);
}

.modern-list-icon {
    display: flex;
    align-items: center;
    justify-content: center;
    width: 32px;
    height: 32px;
    background: var(--success-100);
    color: var(--success-600);
    border-radius: var(--radius-lg);
    font-size: var(--text-sm);
    flex-shrink: 0;
}

.modern-list-content {
    flex: 1;
    color: var(--gray-700);
    line-height: 1.6;
}

/* Sidebar Components */
.modern-sidebar {
    position: sticky;
    top: var(--space-6);
    height: fit-content;
}

.modern-sidebar-card {
    background: white;
    border-radius: var(--radius-xl);
    box-shadow: var(--shadow-md);
    padding: var(--space-6);
    margin-bottom: var(--space-6);
}

.modern-sidebar-title {
    font-size: var(--text-lg);
    font-weight: 600;
    color: var(--gray-800);
    margin-bottom: var(--space-4);
    padding-bottom: var(--space-3);
    border-bottom: 2px solid var(--gray-100);
}

/* Table of Contents */
.modern-toc {
    list-style: none;
    padding: 0;
    margin: 0;
}

.modern-toc-item {
    margin-bottom: var(--space-2);
}

.modern-toc-link {
    display: flex;
    align-items: center;
    gap: var(--space-3);
    padding: var(--space-3) var(--space-4);
    color: var(--gray-600);
    text-decoration: none;
    border-radius: var(--radius-lg);
    transition: all var(--transition-fast);
    font-size: var(--text-sm);
}

.modern-toc-link:hover {
    background: var(--gray-50);
    color: var(--primary-600);
    transform: translateX(4px);
}

.modern-toc-link.active {
    background: var(--primary-50);
    color: var(--primary-700);
    font-weight: 500;
}

.modern-toc-icon {
    font-size: var(--text-sm);
    width: 16px;
    text-align: center;
}

/* Action Buttons */
.modern-action-buttons {
    display: flex;
    flex-direction: column;
    gap: var(--space-3);
}

.modern-btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: var(--space-2);
    padding: var(--space-3) var(--space-6);
    border-radius: var(--radius-xl);
    font-weight: 500;
    font-size: var(--text-sm);
    text-decoration: none;
    border: none;
    cursor: pointer;
    transition: all var(--transition-fast);
    text-align: center;
}

.modern-btn-primary {
    background: var(--primary-600);
    color: white;
}

.modern-btn-primary:hover {
    background: var(--primary-700);
    transform: translateY(-2px);
    box-shadow: var(--shadow-lg);
}

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

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

.modern-btn-outline {
    background: transparent;
    color: var(--primary-600);
    border: 2px solid var(--primary-600);
}

.modern-btn-outline:hover {
    background: var(--primary-600);
    color: white;
}

/* Alert Components */
.modern-alert {
    padding: var(--space-4) var(--space-6);
    border-radius: var(--radius-lg);
    margin-bottom: var(--space-4);
    display: flex;
    align-items: flex-start;
    gap: var(--space-3);
}

.modern-alert-info {
    background: var(--primary-50);
    color: var(--primary-800);
    border-left: 4px solid var(--primary-500);
}

.modern-alert-success {
    background: var(--success-50);
    color: var(--success-800);
    border-left: 4px solid var(--success-500);
}

.modern-alert-warning {
    background: var(--warning-50);
    color: var(--warning-800);
    border-left: 4px solid var(--warning-500);
}

.modern-alert-error {
    background: var(--error-50);
    color: var(--error-800);
    border-left: 4px solid var(--error-500);
}

.modern-alert-icon {
    font-size: var(--text-lg);
    flex-shrink: 0;
    margin-top: 2px;
}

.modern-alert-content {
    flex: 1;
    line-height: 1.6;
}

/* Responsive Design */
@media (max-width: 1024px) {
    .modern-content-grid {
        grid-template-columns: 1fr;
        gap: var(--space-6);
    }

    .modern-sidebar {
        position: static;
        order: -1;
    }

    .modern-feature-grid {
        grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    }
}

@media (max-width: 768px) {
    .modern-page-header {
        padding: var(--space-12) 0;
        text-align: center;
    }

    .modern-page-title {
        font-size: var(--text-3xl);
    }

    .modern-page-subtitle {
        font-size: var(--text-lg);
    }

    .modern-page-description {
        font-size: var(--text-base);
    }

    .modern-material-info {
        margin-top: var(--space-6);
        align-items: center;
    }

    .modern-info-badges {
        justify-content: center;
    }

    .modern-accordion-header {
        padding: var(--space-4);
        gap: var(--space-3);
    }

    .modern-accordion-content.active {
        padding: var(--space-4);
    }

    .modern-accordion-title {
        font-size: var(--text-lg);
    }

    .modern-accordion-chevron {
        width: 20px;
        height: 20px;
        font-size: var(--text-base);
    }

    .modern-feature-grid {
        grid-template-columns: 1fr;
        gap: var(--space-4);
    }

    .modern-card-body {
        padding: var(--space-4);
    }

    .modern-sidebar-card {
        padding: var(--space-4);
    }
}

@media (max-width: 480px) {
    .modern-page-title {
        font-size: var(--text-2xl);
    }

    .modern-accordion-title {
        font-size: var(--text-base);
        gap: var(--space-2);
    }

    .modern-accordion-header {
        gap: var(--space-2);
    }

    .modern-accordion-chevron {
        width: 18px;
        height: 18px;
        font-size: var(--text-sm);
    }

    .modern-feature-card {
        padding: var(--space-4);
    }

    .modern-progress-card {
        padding: var(--space-4);
    }
}

/* Utility Classes */
.text-center { text-align: center; }
.text-left { text-align: left; }
.text-right { text-align: right; }

.mb-0 { margin-bottom: 0; }
.mb-2 { margin-bottom: var(--space-2); }
.mb-4 { margin-bottom: var(--space-4); }
.mb-6 { margin-bottom: var(--space-6); }
.mb-8 { margin-bottom: var(--space-8); }

.mt-0 { margin-top: 0; }
.mt-2 { margin-top: var(--space-2); }
.mt-4 { margin-top: var(--space-4); }
.mt-6 { margin-top: var(--space-6); }
.mt-8 { margin-top: var(--space-8); }

.p-0 { padding: 0; }
.p-2 { padding: var(--space-2); }
.p-4 { padding: var(--space-4); }
.p-6 { padding: var(--space-6); }

.hidden { display: none; }
.block { display: block; }
.flex { display: flex; }
.grid { display: grid; }

.w-full { width: 100%; }
.h-full { height: 100%; }

/* Animation Classes */
.fade-in {
    animation: fadeIn var(--transition-normal) ease-out;
}

.slide-up {
    animation: slideUp var(--transition-normal) ease-out;
}

.scale-in {
    animation: scaleIn var(--transition-fast) ease-out;
}

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

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

@keyframes scaleIn {
    from {
        opacity: 0;
        transform: scale(0.95);
    }
    to {
        opacity: 1;
        transform: scale(1);
    }
}

/* Enhanced Schedule Timeline Styles */
.schedule-timeline-container {
    margin: var(--space-8) 0;
    position: relative;
}

.schedule-timeline {
    position: relative;
    padding: var(--space-4) 0;
}

.timeline-item {
    position: relative;
    display: flex;
    margin-bottom: var(--space-8);
    opacity: 0;
    animation: slideUp var(--transition-normal) ease-out forwards;
}

.timeline-item:nth-child(1) { animation-delay: 0.1s; }
.timeline-item:nth-child(2) { animation-delay: 0.2s; }
.timeline-item:nth-child(3) { animation-delay: 0.3s; }
.timeline-item:nth-child(4) { animation-delay: 0.4s; }
.timeline-item:nth-child(5) { animation-delay: 0.5s; }
.timeline-item:nth-child(6) { animation-delay: 0.6s; }
.timeline-item:nth-child(7) { animation-delay: 0.7s; }

.timeline-marker {
    position: relative;
    flex-shrink: 0;
    width: 60px;
    display: flex;
    flex-direction: column;
    align-items: center;
    margin-right: var(--space-6);
}

.timeline-icon {
    width: 48px;
    height: 48px;
    background: linear-gradient(135deg, var(--primary-500) 0%, var(--primary-600) 100%);
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    color: white;
    font-size: var(--text-lg);
    box-shadow: var(--shadow-lg);
    border: 3px solid white;
    position: relative;
    z-index: 2;
    transition: all var(--transition-normal);
}

.timeline-icon:hover {
    transform: scale(1.1);
    box-shadow: var(--shadow-xl);
}

.timeline-connector {
    width: 2px;
    height: 100px;
    background: linear-gradient(to bottom, var(--primary-200) 0%, var(--gray-200) 100%);
    margin-top: var(--space-2);
    position: relative;
}

.timeline-item:last-child .timeline-connector {
    display: none;
}

.timeline-content {
    flex: 1;
    min-width: 0;
}

.activity-card {
    background: white;
    border-radius: var(--radius-xl);
    padding: var(--space-6);
    box-shadow: var(--shadow-md);
    border: 1px solid var(--gray-200);
    transition: all var(--transition-normal);
    position: relative;
    overflow: hidden;
}

.activity-card::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    height: 4px;
    background: linear-gradient(90deg, var(--primary-500) 0%, var(--primary-600) 100%);
    transform: scaleX(0);
    transform-origin: left;
    transition: transform var(--transition-normal);
}

.activity-card:hover {
    transform: translateY(-2px);
    box-shadow: var(--shadow-xl);
    border-color: var(--primary-300);
}

.activity-card:hover::before {
    transform: scaleX(1);
}

.activity-header {
    display: flex;
    justify-content: space-between;
    align-items: flex-start;
    margin-bottom: var(--space-4);
    gap: var(--space-4);
}

.activity-meta {
    display: flex;
    flex-direction: column;
    gap: var(--space-2);
}

.activity-date {
    background: var(--gray-100);
    color: var(--gray-700);
    padding: var(--space-2) var(--space-3);
    border-radius: var(--radius-lg);
    font-size: var(--text-sm);
    font-weight: 600;
    display: flex;
    align-items: center;
    gap: var(--space-2);
    white-space: nowrap;
}

.activity-title {
    font-size: var(--text-xl);
    font-weight: 700;
    color: var(--gray-900);
    margin-bottom: var(--space-3);
    line-height: 1.3;
}

/* Responsive Timeline Styles */
@media (max-width: 768px) {
    .timeline-marker {
        width: 40px;
        margin-right: var(--space-4);
    }
    
    .timeline-icon {
        width: 36px;
        height: 36px;
        font-size: var(--text-base);
    }
    
    .timeline-connector {
        height: 80px;
    }
    
    .activity-card {
        padding: var(--space-4);
    }
    
    .activity-header {
        flex-direction: column;
        align-items: flex-start;
        gap: var(--space-3);
    }
    
    .activity-title {
        font-size: var(--text-lg);
    }
}

@media (max-width: 480px) {
    .timeline-item {
        margin-bottom: var(--space-6);
    }
    
    .timeline-marker {
        width: 32px;
        margin-right: var(--space-3);
    }
    
    .timeline-icon {
        width: 28px;
        height: 28px;
        font-size: var(--text-sm);
    }
    
    .timeline-connector {
        height: 60px;
    }
    
    .activity-card {
        padding: var(--space-3);
    }
    
    .activity-title {
        font-size: var(--text-base);
    }
}

/* Collapsible Content Styles */
.collapse-content {
    margin-top: var(--space-3);
}

.collapse-content .btn-link {
    text-decoration: none;
    font-weight: 500;
    transition: all var(--transition-fast);
}

.collapse-content .btn-link:hover {
    text-decoration: underline;
    transform: translateX(2px);
}

.collapse-content .btn-link i {
    transition: transform var(--transition-fast);
    margin-left: var(--space-1);
}

.collapse-content .btn-link[aria-expanded="true"] i {
    transform: rotate(180deg);
}

.collapse {
    transition: all var(--transition-normal) ease;
}

.collapse.show {
    animation: fadeInUp var(--transition-normal) ease;
}

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

/* Compact Grid Layout */
.modern-feature-card.h-100 {
    height: 100%;
    display: flex;
    flex-direction: column;
    min-height: 200px;
}

.modern-feature-card.h-100 .modern-feature-description {
    flex-grow: 1;
    display: flex;
    flex-direction: column;
    justify-content: space-between;
}

/* Responsive adjustments for grid */
@media (max-width: 992px) {
    .col-lg-6 {
        margin-bottom: var(--space-4);
    }
}

@media (max-width: 768px) {
    .modern-feature-card.h-100 {
        min-height: 150px;
    }
    
    .modern-feature-title {
        font-size: var(--text-lg);
    }
}