:root {
    --bitcoin-orange: #f7931a;
    --dark-bg: #0a0a0a;
    --dark-panel: #1a1a1a;
    --dark-border: #2a2a2a;
    --text-primary: #ffffff;
    --text-secondary: #a0a0a0;
    --green: #00ff41;
    --red: #ff0040;
    --cyan: #00d9ff;
}

* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

html {
    scroll-behavior: smooth;
}

body {
    font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', 'Roboto', 'Oxygen', 'Ubuntu', 'Cantarell', 'Fira Sans', 'Droid Sans', 'Helvetica Neue', sans-serif;
    background: var(--dark-bg);
    color: var(--text-primary);
    line-height: 1.6;
    overflow-x: hidden;
    padding-top: 80px;
}

.bg-pattern {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    opacity: 0.03;
    pointer-events: none;
    background-image: 
        repeating-linear-gradient(0deg, transparent, transparent 2px, var(--bitcoin-orange) 2px, var(--bitcoin-orange) 4px),
        repeating-linear-gradient(90deg, transparent, transparent 2px, var(--bitcoin-orange) 2px, var(--bitcoin-orange) 4px);
    background-size: 50px 50px;
    z-index: 0;
}

/* Fixed Navigation Menu */
.nav-menu {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    background: rgba(10, 10, 10, 0.95);
    backdrop-filter: blur(10px);
    border-bottom: 2px solid var(--dark-border);
    z-index: 1000;
    padding: 0;
}

.nav-container {
    max-width: 1400px;
    margin: 0 auto;
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 20px 30px;
}

.nav-logo {
    font-size: 24px;
    font-weight: 700;
    color: var(--bitcoin-orange);
    text-decoration: none;
    display: flex;
    align-items: center;
    gap: 10px;
}

.nav-links {
    display: flex;
    gap: 30px;
    list-style: none;
}

.nav-links a {
    color: var(--text-secondary);
    text-decoration: none;
    font-size: 15px;
    font-weight: 500;
    transition: all 0.3s ease;
    padding: 8px 0;
    border-bottom: 2px solid transparent;
}

.nav-links a:hover {
    color: var(--bitcoin-orange);
    border-bottom-color: var(--bitcoin-orange);
}

.nav-links a.active {
    color: var(--text-primary);
    border-bottom-color: var(--bitcoin-orange);
}

@media (max-width: 768px) {
    .nav-container {
        flex-direction: column;
        gap: 15px;
        padding: 15px 20px;
    }

    .nav-links {
        gap: 20px;
        font-size: 14px;
    }
}

.container {
    max-width: 1400px;
    margin: 0 auto;
    padding: 40px 20px;
    position: relative;
    z-index: 1;
}

header {
    text-align: center;
    margin-bottom: 60px;
    animation: fadeInDown 0.8s ease-out;
}

h1 {
    font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', 'Roboto', 'Oxygen', 'Ubuntu', 'Cantarell', 'Fira Sans', 'Droid Sans', 'Helvetica Neue', sans-serif;
    font-size: clamp(2.5rem, 6vw, 5rem);
    font-weight: 800;
    letter-spacing: -2px;
    margin-bottom: 10px;
    text-transform: uppercase;
    background: linear-gradient(135deg, var(--bitcoin-orange) 0%, var(--cyan) 100%);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.subtitle {
    color: var(--text-secondary);
    font-size: 14px;
    text-transform: uppercase;
    letter-spacing: 3px;
}

.grid {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 30px;
    margin-bottom: 40px;
}

@media (max-width: 968px) {
    .grid {
        grid-template-columns: 1fr;
    }
}

.panel {
    background: var(--dark-panel);
    border: 2px solid var(--dark-border);
    margin: 0 0 30px;
    padding: 30px;
    position: relative;
    transition: all 0.3s ease;
}

.panel:hover {
    border-color: var(--bitcoin-orange);
    box-shadow: 0 0 30px rgba(247, 147, 26, 0.1);
}

.panel::before {
    content: '';
    position: absolute;
    top: -2px;
    left: -2px;
    width: 60px;
    height: 2px;
    background: var(--bitcoin-orange);
}

.panel::after {
    content: '';
    position: absolute;
    top: -2px;
    left: -2px;
    width: 2px;
    height: 60px;
    background: var(--bitcoin-orange);
}

.panel-title {
    font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', 'Roboto', 'Oxygen', 'Ubuntu', 'Cantarell', 'Fira Sans', 'Droid Sans', 'Helvetica Neue', sans-serif;
    font-size: 20px;
    font-weight: 700;
    margin-bottom: 25px;
    text-transform: uppercase;
    letter-spacing: 1px;
    color: var(--bitcoin-orange);
}

.input-group {
    margin-bottom: 25px;
}

label {
    display: block;
    font-size: 12px;
    text-transform: uppercase;
    letter-spacing: 1px;
    margin-bottom: 8px;
    color: var(--text-secondary);
}

input, select {
    width: 100%;
    background: var(--dark-bg);
    border: 2px solid var(--dark-border);
    color: var(--text-primary);
    padding: 12px 15px;
    font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', 'Roboto', 'Oxygen', 'Ubuntu', 'Cantarell', 'Fira Sans', 'Droid Sans', 'Helvetica Neue', sans-serif;
    font-size: 16px;
    transition: all 0.3s ease;
}

input:focus, select:focus {
    outline: none;
    border-color: var(--bitcoin-orange);
    box-shadow: 0 0 20px rgba(247, 147, 26, 0.2);
}

input[type="number"]::-webkit-inner-spin-button,
input[type="number"]::-webkit-outer-spin-button {
    opacity: 1;
}

.btn {
    background: var(--bitcoin-orange);
    color: var(--dark-bg);
    border: none;
    padding: 15px 40px;
    font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', 'Roboto', 'Oxygen', 'Ubuntu', 'Cantarell', 'Fira Sans', 'Droid Sans', 'Helvetica Neue', sans-serif;
    font-size: 16px;
    font-weight: 700;
    text-transform: uppercase;
    letter-spacing: 2px;
    cursor: pointer;
    transition: all 0.3s ease;
    width: 100%;
    margin-top: 10px;
}

.btn:hover {
    background: var(--text-primary);
    box-shadow: 0 0 30px rgba(247, 147, 26, 0.5);
    transform: translateY(-2px);
}

.btn:active {
    transform: translateY(0);
}

.stats-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
    gap: 20px;
    margin-bottom: 40px;
}

.stat-card {
    background: var(--dark-panel);
    border: 2px solid var(--dark-border);
    padding: 20px;
    text-align: center;
    transition: all 0.3s ease;
}

.stat-card:hover {
    border-color: var(--bitcoin-orange);
    transform: translateY(-5px);
}

.stat-label {
    font-size: 11px;
    text-transform: uppercase;
    letter-spacing: 1px;
    color: var(--text-secondary);
    margin-bottom: 10px;
}

.stat-value {
    font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', 'Roboto', 'Oxygen', 'Ubuntu', 'Cantarell', 'Fira Sans', 'Droid Sans', 'Helvetica Neue', sans-serif;
    font-size: 28px;
    font-weight: 800;
    color: var(--bitcoin-orange);
}

.stat-value.green {
    color: var(--green);
}

.stat-value.red {
    color: var(--red);
}

.chart-container {
    position: relative;
    height: 400px;
    margin-bottom: 40px;
}

.full-width {
    grid-column: 1 / -1;
}

.scenario-buttons {
    display: flex;
    gap: 10px;
    margin-bottom: 20px;
    flex-wrap: wrap;
}

.scenario-btn {
    background: var(--dark-bg);
    color: var(--text-primary);
    border: 2px solid var(--dark-border);
    padding: 10px 20px;
    font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', 'Roboto', 'Oxygen', 'Ubuntu', 'Cantarell', 'Fira Sans', 'Droid Sans', 'Helvetica Neue', sans-serif;
    font-size: 12px;
    text-transform: uppercase;
    cursor: pointer;
    transition: all 0.3s ease;
    flex: 1;
    min-width: 120px;
}

.scenario-btn:hover {
    border-color: var(--bitcoin-orange);
}

.scenario-btn.active {
    background: var(--bitcoin-orange);
    color: var(--dark-bg);
    border-color: var(--bitcoin-orange);
}

.timeline {
    margin-top: 30px;
}

.timeline-item {
    display: flex;
    align-items: center;
    padding: 15px;
    border-left: 3px solid var(--dark-border);
    margin-bottom: 10px;
    transition: all 0.3s ease;
}

.timeline-item:hover {
    border-color: var(--bitcoin-orange);
    background: rgba(247, 147, 26, 0.05);
}

.timeline-year {
    font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', 'Roboto', 'Oxygen', 'Ubuntu', 'Cantarell', 'Fira Sans', 'Droid Sans', 'Helvetica Neue', sans-serif;
    font-size: 20px;
    font-weight: 700;
    color: var(--bitcoin-orange);
    min-width: 80px;
}

.timeline-value {
    font-size: 18px;
    flex: 1;
}

.timeline-multiple {
    font-size: 14px;
    color: var(--green);
    text-align: right;
}

footer {
    text-align: center;
    margin-top: 60px;
    padding: 30px;
    border-top: 2px solid var(--dark-border);
    color: var(--text-secondary);
    font-size: 12px;
}

.privacy-notice {
    background: rgba(247, 147, 26, 0.1);
    border: 2px solid var(--bitcoin-orange);
    padding: 20px;
    margin-bottom: 40px;
    text-align: center;
}

.privacy-notice strong {
    color: var(--bitcoin-orange);
}

@keyframes fadeInDown {
    from {
        opacity: 0;
        transform: translateY(-30px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

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

.fade-in {
    animation: fadeIn 0.6s ease-out;
}

#results {
    display: none;
}

#results.visible {
    display: block;
}

.comparison-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: 20px;
    margin-top: 30px;
}

.comparison-card {
    background: var(--dark-bg);
    border: 2px solid var(--dark-border);
    padding: 20px;
    text-align: center;
}

.comparison-card h4 {
    color: var(--text-secondary);
    font-size: 14px;
    margin-bottom: 15px;
    text-transform: uppercase;
}

.comparison-value {
    font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', 'Roboto', 'Oxygen', 'Ubuntu', 'Cantarell', 'Fira Sans', 'Droid Sans', 'Helvetica Neue', sans-serif;
    font-size: 24px;
    font-weight: 700;
    color: var(--cyan);
}

.comparison-note {
    margin-top: 10px;
    font-size: 11px;
    color: var(--text-secondary);
}

/* Section styling */
section {
    scroll-margin-top: 100px;
}

.section-header {
    text-align: center;
    margin: 80px 0 40px 0;
}

.section-title {
    font-size: clamp(2rem, 4vw, 3rem);
    font-weight: 800;
    color: var(--bitcoin-orange);
    margin-bottom: 15px;
}

.section-description {
    color: var(--text-secondary);
    font-size: 16px;
    max-width: 700px;
    margin: 0 auto;
}

/* Scroll to top button */
.scroll-to-top {
    position: fixed;
    bottom: 30px;
    right: 30px;
    width: 50px;
    height: 50px;
    background: var(--bitcoin-orange);
    border: 2px solid var(--bitcoin-orange);
    color: var(--dark-bg);
    font-size: 24px;
    font-weight: 700;
    cursor: pointer;
    opacity: 0;
    visibility: hidden;
    transition: all 0.3s ease;
    z-index: 999;
    display: flex;
    align-items: center;
    justify-content: center;
}

.scroll-to-top.visible {
    opacity: 1;
    visibility: visible;
}

.scroll-to-top:hover {
    background: var(--text-primary);
    transform: translateY(-5px);
    box-shadow: 0 5px 20px rgba(247, 147, 26, 0.5);
}

.scroll-to-top:active {
    transform: translateY(-2px);
}

@media (max-width: 768px) {
    .scroll-to-top {
        bottom: 20px;
        right: 20px;
        width: 45px;
        height: 45px;
        font-size: 20px;
    }
}

.resource-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: 20px;
    margin-top: 30px;
}

.resource-card {
    background: var(--dark-panel);
    border: 2px solid var(--dark-border);
    padding: 25px;
    transition: all 0.3s ease;
}

.resource-card:hover {
    border-color: var(--bitcoin-orange);
    transform: translateY(-5px);
}

.resource-card h4 {
    color: var(--bitcoin-orange);
    font-size: 18px;
    font-weight: 700;
    margin-bottom: 15px;
}

.resource-card p {
    color: var(--text-secondary);
    font-size: 14px;
    line-height: 1.8;
}

.resource-card a, footer a {
    color: var(--cyan);
    text-decoration: none;
    font-weight: 600;
}

.resource-card a:hover, footer a:hover {
    text-decoration: underline;
}

.faq-grid {
    display: grid;
    gap: 20px;
    margin-top: 30px;
}

.faq-item {
    background: var(--dark-panel);
    border: 2px solid var(--dark-border);
    padding: 25px;
}

.faq-question {
    color: var(--bitcoin-orange);
    font-size: 18px;
    font-weight: 700;
    margin-bottom: 15px;
}

.faq-answer {
    color: var(--text-secondary);
    font-size: 14px;
    line-height: 1.8;
}

/* Share section */
.share-container {
    max-width: 600px;
    margin: 0 auto;
}

.share-box {
    background: var(--dark-panel);
    border: 2px solid var(--dark-border);
    padding: 30px;
    text-align: center;
    margin-bottom: 30px;
}

.url-display {
    background: var(--dark-bg);
    border: 2px solid var(--dark-border);
    padding: 15px;
    font-family: monospace;
    font-size: 14px;
    color: var(--text-primary);
    margin: 20px 0;
    word-break: break-all;
    user-select: all;
}

.copy-btn {
    background: var(--bitcoin-orange);
    color: var(--dark-bg);
    border: none;
    padding: 12px 30px;
    font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', 'Roboto', 'Oxygen', 'Ubuntu', 'Cantarell', 'Fira Sans', 'Droid Sans', 'Helvetica Neue', sans-serif;
    font-size: 14px;
    font-weight: 700;
    text-transform: uppercase;
    letter-spacing: 1px;
    cursor: pointer;
    transition: all 0.3s ease;
    margin: 5px;
}

.copy-btn:hover {
    background: var(--text-primary);
    transform: translateY(-2px);
    box-shadow: 0 5px 15px rgba(247, 147, 26, 0.3);
}

.copy-btn.success {
    background: var(--green);
    animation: pulse 0.5s ease-in-out;
}

@keyframes pulse {
    0%, 100% {
        transform: scale(1);
    }
    50% {
        transform: scale(1.05);
    }
}

.social-buttons {
    display: flex;
    gap: 15px;
    justify-content: center;
    flex-wrap: wrap;
    margin-top: 30px;
}

.social-btn {
    background: var(--dark-bg);
    border: 2px solid var(--dark-border);
    color: var(--text-primary);
    padding: 12px 25px;
    font-size: 14px;
    font-weight: 600;
    cursor: pointer;
    transition: all 0.3s ease;
    text-decoration: none;
    display: inline-flex;
    align-items: center;
    gap: 8px;
}

.social-btn:hover {
    border-color: var(--bitcoin-orange);
    color: var(--bitcoin-orange);
    transform: translateY(-2px);
}

/* Donate section */
.donate-container {
    max-width: 600px;
    margin: 0 auto;
}

.donate-box {
    background: var(--dark-panel);
    border: 2px solid var(--bitcoin-orange);
    padding: 30px;
    text-align: center;
}

.btc-address {
    background: var(--dark-bg);
    border: 2px solid var(--dark-border);
    padding: 20px;
    font-family: monospace;
    font-size: 13px;
    color: var(--bitcoin-orange);
    margin: 20px 0;
    word-break: break-all;
    user-select: all;
    line-height: 1.8;
}

.donation-note {
    color: var(--text-secondary);
    font-size: 14px;
    margin-top: 20px;
    line-height: 1.8;
}