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

:root {
    --color-bg: #0a0a0a;
    --color-bg-light: #1a1a1a;
    --color-text: #e0e0e0;
    --color-text-dim: #909090;
    --color-accent: #4a4a4a;
    --color-past: #6b4444;
    --color-future: #444a6b;
    --color-hope: #3d5a3d;
    --spacing-xs: 0.5rem;
    --spacing-sm: 1rem;
    --spacing-md: 2rem;
    --spacing-lg: 4rem;
    --spacing-xl: 6rem;
}

body {
    font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, 'Helvetica Neue', Arial, sans-serif;
    background-color: var(--color-bg);
    color: var(--color-text);
    line-height: 1.6;
    overflow-x: hidden;
}

.container {
    max-width: 100%;
    margin: 0 auto;
}

.section {
    min-height: 100vh;
    padding: var(--spacing-lg) var(--spacing-md);
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
}

.hidden {
    display: none !important;
}

/* Intro Section */
.intro-section {
    text-align: center;
}

.intro-content {
    max-width: 600px;
}

.intro-section h1 {
    font-size: 3rem;
    font-weight: 300;
    margin-bottom: var(--spacing-md);
    letter-spacing: -0.02em;
}

.subtitle {
    font-size: 1.2rem;
    color: var(--color-text-dim);
    margin-bottom: var(--spacing-lg);
    line-height: 1.8;
}

/* Form Styles */
.birth-year-form {
    background: var(--color-bg-light);
    padding: var(--spacing-md);
    border-radius: 8px;
    border: 1px solid var(--color-accent);
}

.form-group {
    margin-bottom: var(--spacing-md);
    text-align: left;
}

.form-group label {
    display: block;
    margin-bottom: var(--spacing-xs);
    font-size: 0.9rem;
    color: var(--color-text-dim);
}

.form-group input {
    width: 100%;
    padding: var(--spacing-sm);
    font-size: 1rem;
    background: var(--color-bg);
    border: 1px solid var(--color-accent);
    border-radius: 4px;
    color: var(--color-text);
    transition: border-color 0.3s;
}

.form-group input:focus {
    outline: none;
    border-color: var(--color-text-dim);
}

/* Buttons */
.btn-primary,
.btn-secondary {
    padding: var(--spacing-sm) var(--spacing-md);
    font-size: 1rem;
    border: none;
    border-radius: 4px;
    cursor: pointer;
    transition: all 0.3s;
    font-weight: 500;
}

.btn-primary {
    background: var(--color-text);
    color: var(--color-bg);
    width: 100%;
    margin-top: var(--spacing-sm);
}

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

.btn-secondary {
    background: transparent;
    color: var(--color-text);
    border: 1px solid var(--color-accent);
}

.btn-secondary:hover {
    border-color: var(--color-text-dim);
}

/* Loading Section */
.loading-section {
    text-align: center;
}

.loading-spinner {
    width: 50px;
    height: 50px;
    border: 3px solid var(--color-accent);
    border-top-color: var(--color-text);
    border-radius: 50%;
    animation: spin 1s linear infinite;
    margin: 0 auto var(--spacing-md);
}

@keyframes spin {
    to { transform: rotate(360deg); }
}

/* Timeline Section */
.timeline-section {
    padding-top: var(--spacing-md);
    align-items: flex-start;
    min-height: auto;
}

.timeline-header {
    width: 100%;
    max-width: 800px;
    margin: 0 auto var(--spacing-lg);
    text-align: center;
}

.timeline-header h2 {
    font-size: 2rem;
    font-weight: 300;
    margin-bottom: var(--spacing-md);
}

.statistics {
    display: flex;
    justify-content: center;
    gap: var(--spacing-lg);
    margin-bottom: var(--spacing-md);
    flex-wrap: wrap;
}

.stat-item {
    display: flex;
    flex-direction: column;
    align-items: center;
}

.stat-number {
    font-size: 2.5rem;
    font-weight: 300;
    color: var(--color-text);
}

.stat-number.past {
    color: #b88080;
}

.stat-number.future {
    color: #8080b8;
}

.stat-label {
    font-size: 0.9rem;
    color: var(--color-text-dim);
    margin-top: var(--spacing-xs);
}

#backButton {
    margin-top: var(--spacing-md);
}

/* Timeline Container */
.timeline-container {
    width: 100%;
    max-width: 800px;
    margin: 0 auto;
    position: relative;
    padding: var(--spacing-md) 0 var(--spacing-xl);
}

.timeline-line {
    position: absolute;
    left: 50%;
    top: 0;
    bottom: 0;
    width: 2px;
    background: var(--color-accent);
    transform: translateX(-50%);
}

.timeline-events {
    position: relative;
}

.timeline-event {
    position: relative;
    margin-bottom: var(--spacing-lg);
    opacity: 0;
    transform: translateY(20px);
    animation: fadeInUp 0.6s forwards;
}

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

.timeline-event:nth-child(even) .event-content {
    margin-left: auto;
}

.event-marker {
    position: absolute;
    left: 50%;
    top: 0;
    width: 16px;
    height: 16px;
    border-radius: 50%;
    background: var(--color-bg);
    border: 3px solid var(--color-accent);
    transform: translateX(-50%);
    z-index: 2;
}

.timeline-event.past .event-marker {
    border-color: var(--color-past);
}

.timeline-event.future .event-marker {
    border-color: var(--color-future);
}

.event-content {
    width: calc(50% - 40px);
    background: var(--color-bg-light);
    padding: var(--spacing-md);
    border-radius: 8px;
    border: 1px solid var(--color-accent);
}

.timeline-event.past .event-content {
    border-color: var(--color-past);
}

.timeline-event.future .event-content {
    border-color: var(--color-future);
}

.event-year {
    font-size: 1.5rem;
    font-weight: 300;
    margin-bottom: var(--spacing-xs);
    color: var(--color-text-dim);
}

.event-title {
    font-size: 1.2rem;
    font-weight: 500;
    margin-bottom: var(--spacing-xs);
}

.event-meta {
    font-size: 0.85rem;
    color: var(--color-text-dim);
    margin-bottom: var(--spacing-sm);
}

.event-meta span {
    margin-right: var(--spacing-sm);
}

.event-description {
    font-size: 0.95rem;
    line-height: 1.6;
    color: var(--color-text-dim);
}

.event-projected {
    display: inline-block;
    font-size: 0.75rem;
    padding: 2px 8px;
    background: var(--color-future);
    border-radius: 3px;
    margin-top: var(--spacing-xs);
}

/* Milestone markers for birth year and current year */
.timeline-milestone {
    position: relative;
    margin: var(--spacing-xl) 0;
    text-align: center;
}

.milestone-marker {
    display: inline-block;
    padding: var(--spacing-sm) var(--spacing-md);
    background: var(--color-accent);
    border-radius: 4px;
    font-weight: 500;
    position: relative;
    z-index: 3;
}

.milestone-marker.birth {
    background: var(--color-hope);
}

.milestone-marker.today {
    background: var(--color-text);
    color: var(--color-bg);
}

/* Actions Section */
.actions-section {
    background: linear-gradient(to bottom, var(--color-bg), var(--color-bg-light));
    min-height: 100vh;
    padding-top: var(--spacing-xl);
}

.actions-header {
    max-width: 800px;
    text-align: center;
    margin-bottom: var(--spacing-lg);
}

.actions-header h2 {
    font-size: 2.5rem;
    font-weight: 300;
    margin-bottom: var(--spacing-md);
    color: var(--color-text);
}

.actions-intro {
    font-size: 1.1rem;
    color: var(--color-text-dim);
    line-height: 1.8;
}

.actions-list {
    max-width: 900px;
    width: 100%;
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: var(--spacing-md);
    margin-bottom: var(--spacing-lg);
}

.action-card {
    background: var(--color-bg-light);
    border: 1px solid var(--color-hope);
    border-radius: 8px;
    padding: var(--spacing-md);
    transition: transform 0.3s, border-color 0.3s;
    opacity: 0;
    animation: fadeInUp 0.6s forwards;
}

.action-card:hover {
    transform: translateY(-4px);
    border-color: var(--color-text-dim);
}

.action-header {
    display: flex;
    justify-content: space-between;
    align-items: flex-start;
    margin-bottom: var(--spacing-sm);
}

.action-title {
    font-size: 1.1rem;
    font-weight: 500;
    color: var(--color-text);
}

.action-badges {
    display: flex;
    gap: var(--spacing-xs);
    flex-wrap: wrap;
    margin-bottom: var(--spacing-sm);
}

.badge {
    font-size: 0.7rem;
    padding: 2px 8px;
    border-radius: 3px;
    background: var(--color-accent);
    text-transform: uppercase;
    letter-spacing: 0.05em;
}

.badge.high-impact {
    background: var(--color-hope);
}

.badge.medium-impact {
    background: var(--color-future);
}

.action-description {
    font-size: 0.95rem;
    line-height: 1.6;
    color: var(--color-text-dim);
    margin-bottom: var(--spacing-sm);
}

.action-link {
    display: inline-block;
    color: var(--color-text);
    text-decoration: none;
    font-size: 0.9rem;
    border-bottom: 1px solid var(--color-accent);
    transition: border-color 0.3s;
}

.action-link:hover {
    border-color: var(--color-text);
}

.actions-footer {
    text-align: center;
    margin-top: var(--spacing-lg);
    max-width: 600px;
}

.actions-footer p {
    font-size: 1.2rem;
    margin-bottom: var(--spacing-md);
    font-style: italic;
    color: var(--color-text-dim);
}

/* Responsive Design */
@media (max-width: 768px) {
    .intro-section h1 {
        font-size: 2rem;
    }

    .timeline-header h2 {
        font-size: 1.5rem;
    }

    .statistics {
        gap: var(--spacing-md);
    }

    .stat-number {
        font-size: 2rem;
    }

    .timeline-line {
        left: 20px;
    }

    .event-marker {
        left: 20px;
    }

    .timeline-event .event-content {
        width: calc(100% - 60px);
        margin-left: 60px !important;
    }

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

    .actions-header h2 {
        font-size: 2rem;
    }
}