body {
    font-family: 'Helvetica Neue', Helvetica, Arial, sans-serif;
    margin: 0;
    padding: 0;
    background: #f8f9fa;
    min-height: 100vh;
    line-height: 1.4;
    font-weight: 300;
}

.container {
    max-width: 1400px;
    margin: 0 auto;
    background: white;
    padding: 0;
    position: relative;
}

h1 {
    text-align: left;
    color: #000;
    margin: 0;
    padding: 30px 60px 20px;
    font-size: 3.2em;
    font-weight: 100;
    letter-spacing: -0.02em;
    cursor: pointer;
    transition: all 0.2s ease;
    display: inline-block;
    width: auto;
}

h1:hover {
    color: #333;
    transform: translateX(5px);
}

.subtitle {
    text-align: left;
    color: #666;
    margin: 0;
    padding: 0 60px 40px;
    font-size: 1.1em;
    font-weight: 300;
    border-bottom: 3px solid #000;
    margin-bottom: 40px;
}

.use-case-section {
    background: #000;
    color: #fff;
    transition: all 0.3s ease;
    overflow: hidden;
    padding: 40px 60px;
}

.use-case-section.collapsed {
    padding: 20px 60px;
    border-bottom: 1px solid #333;
}

.use-case-section.collapsed .use-case-title {
    font-size: 1.2em;
    cursor: default;
}

.selected-use-case {
    cursor: pointer;
    transition: all 0.2s ease;
}

.selected-use-case:hover {
    color: #ccc;
}

.breadcrumb-separator {
    margin: 0 10px;
    color: #666;
}

.current-phase {
    color: #fff;
    font-weight: 500;
}

.use-case-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    cursor: pointer;
}

.use-case-title {
    font-size: 1.8em;
    font-weight: 100;
    letter-spacing: -0.01em;
    transition: all 0.3s ease;
}

.use-cases {
    margin-top: 30px;
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: 1px;
    background: #333;
}

.use-case {
    background: #fff;
    color: #000;
    padding: 25px;
    text-align: center;
    cursor: pointer;
    transition: all 0.2s ease;
}

.use-case:hover {
    background: #f0f0f0;
}

.use-case.active {
    background: #333;
    color: #fff;
}

.use-case-card-title {
    font-size: 1.2em;
    font-weight: 500;
    margin-bottom: 10px;
    pointer-events: none;
}

.use-case-description {
    font-size: 0.9em;
    font-weight: 300;
    color: #666;
    pointer-events: none;
}

.use-case.active .use-case-description {
    color: #ccc;
}

.workflow-section {
    background: #000;
    color: #fff;
    padding: 40px 60px;
    display: none;
}

.workflow-title {
    font-size: 1.8em;
    font-weight: 100;
    letter-spacing: -0.01em;
    margin-bottom: 30px;
}

.workflow-timeline {
    display: flex;
    align-items: center;
    justify-content: space-between;
    position: relative;
    padding: 60px 40px 40px;
    margin-bottom: 20px;
}

.workflow-line {
    position: absolute;
    top: 50%;
    left: 40px;
    right: 40px;
    height: 2px;
    background: #fff;
    transform: translateY(-50%);
}

.workflow-phase-circle {
    position: relative;
    background: #fff;
    color: #000;
    width: 24px;
    height: 24px;
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    cursor: pointer;
    transition: all 0.2s ease;
    font-size: 0.7em;
    font-weight: 700;
    border: 2px solid #fff;
    z-index: 10;
    flex-shrink: 0;
    margin-top: -12px;
}

.workflow-phase-circle:hover,
.workflow-phase-circle.hover {
    background: #333;
    color: #fff;
    transform: scale(1.2);
}

.workflow-phase-circle.active {
    background: #333;
    color: #fff;
    transform: scale(1.3);
}

.phase-title-label {
    position: absolute;
    font-size: 1em;
    font-weight: 500;
    text-transform: uppercase;
    letter-spacing: 0.5px;
    white-space: nowrap;
    transition: all 0.2s ease;
    color: #999;
    pointer-events: none;
}

.workflow-phase-circle.active .phase-title-label,
.workflow-phase-circle:hover .phase-title-label,
.workflow-phase-circle.hover .phase-title-label {
    color: #fff;
}

.phase-title-label.above {
    bottom: 35px;
    left: 50%;
    transform: translateX(-50%);
}

.phase-title-label.below {
    top: 35px;
    left: 50%;
    transform: translateX(-50%);
}

.phase-content {
    background: #fff;
    color: #000;
    padding: 40px 60px;
    margin-top: 20px;
    display: none;
}

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

.phase-title {
    font-size: 2em;
    font-weight: 500;
    margin: 0 0 15px 0;
    padding: 0px 30px 0;
    color: #000;
    letter-spacing: -0.01em;
}

.phase-navigation {
    display: flex;
    align-items: center;
    justify-content: space-between;
    font-size: 0.9em;
    padding: 0 30px 30px;
}

.nav-breadcrumb {
    display: flex;
    align-items: center;
}

.nav-timestamp {
    font-size: 0.85em;
    color: #999;
    font-style: italic;
}

.hidden-text {
    color: #fff !important;
}

.nav-item {
    color: #666;
    font-weight: 300;
}

.nav-item.active {
    color: #000;
    font-weight: 500;
}

.nav-separator {
    margin: 0 10px;
    color: #999;
}

.content-timestamp {
    font-size: 0.75em;
    color: #999;
    text-align: right;
    margin: 10px 30px 20px;
    font-style: italic;
    border-bottom: 1px solid #f0f0f0;
    padding-bottom: 15px;
}

.phase-description {
    background: #f8f9fa;
    padding: 30px;
    margin-bottom: 30px;
    border-left: 3px solid #000;
    font-size: 1em;
    font-weight: 300;
    line-height: 1.6;
}

.ai-enhancement-section {
    background: #000;
    color: #fff;
    padding: 30px;
    margin-bottom: 40px;
}

.ai-title {
    font-size: 1.2em;
    font-weight: 500;
    margin-bottom: 20px;
    letter-spacing: -0.01em;
}

.ai-capabilities {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: 20px;
}

.ai-capability {
    background: rgba(255,255,255,0.1);
    padding: 20px;
    border-left: 3px solid #fff;
}

.capability-title {
    font-weight: 500;
    margin-bottom: 10px;
    font-size: 1em;
}

.capability-description {
    font-size: 0.9em;
    font-weight: 300;
    color: #ccc;
    line-height: 1.5;
}

.tool-categories {
    margin-bottom: 40px;
}

.categories-title {
    font-size: 1.4em;
    font-weight: 500;
    margin-bottom: 30px;
    color: #000;
    letter-spacing: -0.01em;
}

.category-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: 1px;
    background: #e9ecef;
}

.tool-category {
    background: white;
    padding: 30px;
    transition: all 0.2s ease;
}

.tool-category:hover {
    background: #f8f9fa;
}

.category-name {
    font-size: 1.1em;
    font-weight: 500;
    color: #000;
    margin-bottom: 15px;
    letter-spacing: -0.01em;
}

.category-purpose {
    color: #666;
    font-size: 0.9em;
    margin-bottom: 20px;
    font-weight: 300;
    line-height: 1.5;
}

.tools-list {
    display: flex;
    flex-wrap: wrap;
    gap: 8px;
}

.tool-tag {
    background: #f0f0f0;
    color: #333;
    padding: 4px 12px;
    font-size: 0.8em;
    font-weight: 300;
    border: 1px solid #ddd;
    transition: all 0.2s ease;
    cursor: pointer;
    border-radius: 0px;
}

.tool-tag:hover {
    background: #000;
    color: #fff;
    border-color: #000;
}

.skill-tag {
    background-color: #e3f2fd !important;
    color: #1976d2 !important;
    border-color: #1976d2 !important;
}

.skill-tag:hover {
    background: #1976d2 !important;
    color: #fff !important;
}

.complexity-low { color: #4caf50; }
.complexity-medium { color: #ff9800; }
.complexity-high { color: #f44336; }

.cross-phase-tools {
    background: #f8f9fa;
    padding: 30px;
    border-top: 1px solid #e9ecef;
    margin-top: 30px;
}

.cross-phase-title {
    font-size: 1.2em;
    font-weight: 500;
    margin-bottom: 20px;
    color: #000;
}

.cross-phase-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
    gap: 15px;
}

.cross-phase-tool {
    background: white;
    padding: 20px;
    border: 1px solid #e9ecef;
    text-align: center;
    transition: all 0.2s ease;
    cursor: pointer;
    border-radius: 0px;
}

.cross-phase-tool:hover {
    background: #f0f0f0;
    border-color: #000;
    transform: translateY(-2px);
    box-shadow: 0 4px 8px rgba(0,0,0,0.05);
}

.cross-tool-name {
    font-weight: 500;
    margin-bottom: 10px;
    font-size: 0.9em;
}

.cross-tool-phases {
    font-size: 0.8em;
    color: #666;
    font-weight: 300;
}

/* Tool Info Modal */
.tool-info-modal {
    display: none;
    position: fixed;
    z-index: 2000;
    left: 0;
    top: 0;
    width: 100%;
    height: 100%;
    background-color: rgba(0,0,0,0.7);
    opacity: 0;
    transition: opacity 0.3s ease;
}

.tool-info-modal.active {
    display: flex;
    align-items: center;
    justify-content: center;
    opacity: 1;
}

.tool-info-content {
    background: white;
    padding: 40px;
    max-width: 600px;
    width: 90%;
    max-height: 80vh;
    overflow-y: auto;
    position: relative;
    border-radius: 0px;
    transform: scale(0.95);
    transition: transform 0.3s ease;
}

.tool-info-modal.active .tool-info-content {
    transform: scale(1);
}

.tool-info-close {
    position: absolute;
    top: 15px;
    right: 20px;
    background: none;
    border: none;
    font-size: 2em;
    cursor: pointer;
    color: #aaa;
    transition: color 0.2s ease;
    line-height: 1;
}

.tool-info-close:hover {
    color: #000;
}