/* ========================
   CSS Variables & Reset
   ======================== */
:root {
    /* Colors - Brighter theme for readability */
    --bg-primary: #0f1419;
    --bg-secondary: #1a2332;
    --bg-card: #1e2a3a;
    --bg-card-hover: #263545;

    --accent-primary: #f7931a;
    /* Bitcoin Orange */
    --accent-secondary: #ffb347;
    --accent-glow: rgba(247, 147, 26, 0.25);

    --text-primary: #ffffff;
    --text-secondary: #c5cdd8;
    --text-muted: #8b98a8;

    /* Spacing */
    --space-xs: 0.5rem;
    --space-sm: 1rem;
    --space-md: 1.5rem;
    --space-lg: 2rem;
    --space-xl: 3rem;
    --space-2xl: 5rem;

    /* Border Radius */
    --radius-sm: 8px;
    --radius-md: 12px;
    --radius-lg: 20px;

    /* Transitions */
    --transition-fast: 0.2s ease;
    --transition-medium: 0.3s ease;
    --transition-slow: 0.5s ease;
}

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

html {
    scroll-behavior: smooth;
}

body {
    font-family: 'Inter', -apple-system, BlinkMacSystemFont, sans-serif;
    background-color: var(--bg-primary);
    color: var(--text-primary);
    line-height: 1.6;
    min-height: 100vh;
}

/* ========================
   Hero Section
   ======================== */
.hero {
    min-height: 100vh;
    display: flex;
    flex-direction: column;
    justify-content: center;
    align-items: center;
    text-align: center;
    padding: var(--space-lg);
    background:
        radial-gradient(ellipse at 50% 0%, rgba(247, 147, 26, 0.15) 0%, transparent 50%),
        #0d0d14;
    position: relative;
}

.hero-content {
    max-width: 800px;
}

.hero-title {
    font-size: clamp(2.5rem, 8vw, 5rem);
    font-weight: 800;
    line-height: 1.1;
    margin-bottom: var(--space-md);
    letter-spacing: -0.02em;
}

.highlight {
    background: linear-gradient(135deg, var(--accent-primary), var(--accent-secondary));
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.hero-subtitle {
    font-size: clamp(1.5rem, 4vw, 2.5rem);
    font-weight: 600;
    color: var(--text-secondary);
    margin-bottom: var(--space-lg);
}

.hero-punchline {
    font-size: clamp(1.1rem, 2.5vw, 1.5rem);
    color: var(--text-muted);
}

.counter {
    font-weight: 700;
    color: var(--accent-primary);
    font-size: 1.2em;
}

/* Scroll Indicator */
.scroll-indicator {
    position: absolute;
    bottom: var(--space-xl);
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: var(--space-sm);
    color: var(--text-muted);
    font-size: 0.9rem;
    animation: bounce 2s infinite;
}

.arrow-down {
    width: 24px;
    height: 24px;
    border-right: 2px solid var(--accent-primary);
    border-bottom: 2px solid var(--accent-primary);
    transform: rotate(45deg);
}

@keyframes bounce {

    0%,
    20%,
    50%,
    80%,
    100% {
        transform: translateY(0);
    }

    40% {
        transform: translateY(10px);
    }

    60% {
        transform: translateY(5px);
    }
}

/* ========================
   Main Content
   ======================== */
.content {
    max-width: 1400px;
    margin: 0 auto;
    padding: var(--space-xl) var(--space-lg);
}

.intro {
    text-align: center;
    max-width: 800px;
    margin: 0 auto var(--space-2xl);
    font-size: 1.2rem;
    color: var(--text-secondary);
}

.intro strong {
    color: var(--accent-primary);
}

/* ========================
   Categories Grid
   ======================== */
.categories-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(320px, 1fr));
    gap: var(--space-lg);
}

.category-card {
    background: var(--bg-card);
    border-radius: var(--radius-lg);
    padding: var(--space-lg);
    transition:
        transform var(--transition-medium),
        box-shadow var(--transition-medium),
        background-color var(--transition-medium);
    border: 1px solid rgba(255, 255, 255, 0.08);
}

.category-card:hover {
    transform: translateY(-4px);
    background: var(--bg-card-hover);
    border-color: rgba(247, 147, 26, 0.3);
    box-shadow:
        0 15px 35px rgba(0, 0, 0, 0.25),
        0 0 20px var(--accent-glow);
}

.card-header {
    display: flex;
    align-items: center;
    gap: var(--space-sm);
    margin-bottom: var(--space-md);
    padding-bottom: var(--space-sm);
    border-bottom: 1px solid rgba(255, 255, 255, 0.06);
}

.card-icon {
    font-size: 1.8rem;
    line-height: 1;
}

.card-header h2 {
    font-size: 1.1rem;
    font-weight: 600;
    color: var(--text-primary);
}

.card-list {
    list-style: none;
    display: flex;
    flex-direction: column;
    gap: 0.4rem;
}

.card-list li {
    padding: 0.35rem 0;
    color: var(--text-secondary);
    font-size: 0.9rem;
    position: relative;
    padding-left: 1.4rem;
    line-height: 1.4;
}

.card-list li::before {
    content: '•';
    position: absolute;
    left: 0;
    color: var(--accent-primary);
    opacity: 0.7;
    font-weight: bold;
}

.category-card:hover .card-list li {
    color: var(--text-primary);
}

.category-card:hover .card-list li::before {
    opacity: 1;
}

/* ========================
   Conclusion Section
   ======================== */
.conclusion {
    text-align: center;
    max-width: 700px;
    margin: var(--space-2xl) auto;
    padding: var(--space-lg);
}

.conclusion h2 {
    font-size: 1.5rem;
    margin-bottom: var(--space-md);
    color: var(--text-primary);
    font-weight: 600;
}

.conclusion p {
    font-size: 1rem;
    color: var(--text-muted);
    margin-bottom: var(--space-sm);
    line-height: 1.7;
}

.conclusion-highlight {
    font-size: 1.3rem !important;
    font-weight: 600;
    color: var(--accent-primary) !important;
    margin: var(--space-lg) 0 var(--space-sm) !important;
}

.conclusion-note {
    font-size: 0.9rem !important;
    color: var(--text-muted) !important;
    opacity: 0.7;
}

/* ========================
   Analysis Section
   ======================== */
.analysis {
    max-width: 800px;
    margin: var(--space-2xl) auto;
    padding: 0 var(--space-lg);
}

.analysis>h2 {
    text-align: center;
    font-size: clamp(1.3rem, 3vw, 1.6rem);
    margin-bottom: var(--space-xl);
    color: var(--text-secondary);
    font-weight: 500;
}

.analysis-grid {
    display: grid;
    grid-template-columns: 1fr;
    gap: var(--space-xl);
}

.analysis-card {
    padding: 0;
}

.analysis-card h3 {
    font-size: 1rem;
    margin-bottom: var(--space-md);
    color: var(--accent-primary);
    font-weight: 600;
}

.analysis-card>p {
    color: var(--text-secondary);
    margin-bottom: var(--space-sm);
    font-size: 0.95rem;
}

.analysis-card ul {
    list-style: none;
    margin: var(--space-sm) 0;
    columns: 2;
    column-gap: var(--space-lg);
}

.analysis-card li {
    padding: var(--space-xs) 0;
    padding-left: 1rem;
    position: relative;
    color: var(--text-muted);
    font-size: 0.85rem;
    line-height: 1.5;
    break-inside: avoid;
}

.analysis-card li::before {
    content: '•';
    position: absolute;
    left: 0;
    color: var(--text-muted);
}

.analysis-card li strong {
    color: var(--text-secondary);
    font-weight: 500;
}

.analysis-highlight {
    margin-top: var(--space-md) !important;
    font-size: 0.9rem;
    color: var(--text-secondary) !important;
    font-style: italic;
}

@media (max-width: 600px) {
    .analysis-card ul {
        columns: 1;
    }
}

/* ========================
   Footer
   ======================== */
.footer {
    text-align: center;
    padding: var(--space-xl) var(--space-lg);
    border-top: 1px solid rgba(255, 255, 255, 0.05);
    color: var(--text-muted);
}

.footer p {
    margin-bottom: var(--space-xs);
}

.footer-note {
    font-size: 0.85rem;
    font-style: italic;
}

.footer-contact {
    margin-top: var(--space-sm);
    font-size: 0.8rem;
}

.footer-contact a {
    color: var(--accent-primary);
    text-decoration: none;
}

.footer-contact a:hover {
    text-decoration: underline;
}

/* ========================
   Responsive Design
   ======================== */
@media (max-width: 768px) {
    .categories-grid {
        grid-template-columns: 1fr;
    }

    .content {
        padding: var(--space-lg) var(--space-sm);
    }

    .category-card {
        padding: var(--space-md);
    }
}

@media (max-width: 480px) {
    .hero-title {
        font-size: 2rem;
    }

    .hero-subtitle {
        font-size: 1.3rem;
    }

    .card-header h2 {
        font-size: 1rem;
    }
}

/* ========================
   Animations
   ======================== */
.category-card {
    opacity: 0;
    transform: translateY(30px);
    animation: fadeInUp 0.6s ease forwards;
}

.category-card:nth-child(1) {
    animation-delay: 0.1s;
}

.category-card:nth-child(2) {
    animation-delay: 0.15s;
}

.category-card:nth-child(3) {
    animation-delay: 0.2s;
}

.category-card:nth-child(4) {
    animation-delay: 0.25s;
}

.category-card:nth-child(5) {
    animation-delay: 0.3s;
}

.category-card:nth-child(6) {
    animation-delay: 0.35s;
}

.category-card:nth-child(7) {
    animation-delay: 0.4s;
}

.category-card:nth-child(8) {
    animation-delay: 0.45s;
}

.category-card:nth-child(9) {
    animation-delay: 0.5s;
}

.category-card:nth-child(10) {
    animation-delay: 0.55s;
}

.category-card:nth-child(11) {
    animation-delay: 0.6s;
}

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