/* CSS Variables */
:root {
    /* Bitcoin Black & Gold Theme */
    --bitcoin-gold: #FFB300;
    --bitcoin-gold-dark: #FF8C00;
    --bitcoin-gold-light: #FFD700;
    --bitcoin-black: #000000;
    --bitcoin-dark: #0A0A0A;
    --bitcoin-darker: #050505;
    --bitcoin-gray: #2A2A2A;
    --bitcoin-gray-light: #4A4A4A;

    /* Enhanced Glassmorphism */
    --glass-bg: rgba(0, 0, 0, 0.3);
    --glass-bg-light: rgba(255, 179, 0, 0.1);
    --glass-border: rgba(255, 179, 0, 0.3);
    --glass-shadow: 0 8px 32px 0 rgba(0, 0, 0, 0.6);
    --glass-glow: 0 0 20px rgba(255, 179, 0, 0.2);

    /* Colors */
    --primary: var(--bitcoin-gold);
    --primary-dark: var(--bitcoin-gold-dark);
    --primary-light: var(--bitcoin-gold-light);
    --secondary: var(--bitcoin-dark);
    --background: var(--bitcoin-black);
    --surface: var(--glass-bg);
    --text-primary: #FFFFFF;
    --text-secondary: #D4D4D4;
    --text-muted: #999999;

    /* Typography */
    --font-family: 'Inter', -apple-system, BlinkMacSystemFont, sans-serif;
    --font-weight-normal: 400;
    --font-weight-medium: 500;
    --font-weight-semibold: 600;
    --font-weight-bold: 700;

    /* Spacing */
    --spacing-xs: 0.5rem;
    --spacing-sm: 1rem;
    --spacing-md: 1.5rem;
    --spacing-lg: 2rem;
    --spacing-xl: 3rem;
    --spacing-xxl: 4rem;

    /* Border Radius */
    --radius-sm: 0.5rem;
    --radius-md: 0.75rem;
    --radius-lg: 1rem;

    /* Shadows */
    --shadow-sm: 0 2px 8px rgba(0, 0, 0, 0.1);
    --shadow-md: 0 4px 16px rgba(0, 0, 0, 0.2);
    --shadow-lg: 0 8px 32px rgba(0, 0, 0, 0.3);
}

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

html {
    scroll-behavior: smooth;
}

body {
    font-family: var(--font-family);
    font-weight: var(--font-weight-normal);
    line-height: 1.6;
    color: var(--text-primary);
    background: var(--background);
    background-image:
        radial-gradient(circle at 20% 50%, rgba(247, 147, 26, 0.1) 0%, transparent 50%),
        radial-gradient(circle at 80% 80%, rgba(247, 147, 26, 0.05) 0%, transparent 50%),
        radial-gradient(circle at 40% 20%, rgba(247, 147, 26, 0.08) 0%, transparent 50%);
    background-attachment: fixed;
    overflow-x: hidden;
}

/* Responsive Breakpoints */
/* Ultra-Tiny */
@media (max-width: 247.98px) {
    :root {
        --font-size-base: 14px;
    }
}

/* Smartwatch */
@media (min-width: 248px) and (max-width: 383.98px) {
    :root {
        --font-size-base: 14px;
    }
}

/* Mobile */
@media (min-width: 384px) and (max-width: 575.98px) {
    :root {
        --font-size-base: 15px;
    }
}

/* Mobile Large */
@media (min-width: 576px) and (max-width: 767.98px) {
    :root {
        --font-size-base: 16px;
    }
}

/* Tablet */
@media (min-width: 768px) and (max-width: 991.98px) {
    :root {
        --font-size-base: 16px;
    }
}

/* Desktop */
@media (min-width: 992px) and (max-width: 1199.98px) {
    :root {
        --font-size-base: 16px;
    }
}

/* Large Desktop */
@media (min-width: 1200px) and (max-width: 1535.98px) {
    :root {
        --font-size-base: 16px;
    }
}

/* HD Monitor */
@media (min-width: 1536px) and (max-width: 2559.98px) {
    :root {
        --font-size-base: 17px;
    }
}

/* 4K TV */
@media (min-width: 2560px) {
    :root {
        --font-size-base: 18px;
    }
}

/* Container */
.container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 var(--spacing-sm);
}

/* Navigation */
.navbar {
    position: fixed;
    top: 0;
    width: 100%;
    z-index: 1000;
    background: var(--glass-bg);
    backdrop-filter: blur(15px);
    -webkit-backdrop-filter: blur(15px);
    border-bottom: 1px solid var(--glass-border);
    box-shadow: var(--glass-glow);
}

.nav-container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 var(--spacing-sm);
    display: flex;
    justify-content: space-between;
    align-items: center;
    height: 70px;
}

.nav-brand .logo-container {
    display: flex;
    align-items: center;
    gap: var(--spacing-xs);
}

.bitcoin-logo {
    font-size: 1.5rem;
    color: var(--primary);
    font-weight: var(--font-weight-bold);
}

.brand-text {
    font-size: 1.25rem;
    font-weight: var(--font-weight-bold);
    color: var(--text-primary);
}

.nav-menu {
    display: flex;
    list-style: none;
    gap: var(--spacing-md);
}

.nav-link {
    color: var(--text-primary);
    text-decoration: none;
    font-weight: var(--font-weight-medium);
    transition: color 0.3s ease;
    padding: var(--spacing-xs) var(--spacing-sm);
    border-radius: var(--radius-sm);
}

.nav-link:hover {
    color: var(--primary);
}

.mobile-menu-toggle {
    display: none;
    flex-direction: column;
    background: none;
    border: none;
    cursor: pointer;
    padding: var(--spacing-xs);
}

.mobile-menu-toggle span {
    width: 25px;
    height: 3px;
    background: var(--text-primary);
    margin: 2px 0;
    transition: 0.3s;
    border-radius: 2px;
}

/* Hero Section */
.hero {
    min-height: 100vh;
    display: flex;
    align-items: center;
    padding-top: 70px;
    position: relative;
    background: linear-gradient(135deg, var(--bitcoin-black) 0%, var(--bitcoin-dark) 50%, var(--bitcoin-black) 100%);
}

.hero-canvas {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    z-index: 1;
    opacity: 0.8;
    background: radial-gradient(circle at center, rgba(255, 179, 0, 0.1) 0%, rgba(0, 0, 0, 0.8) 100%);
    border-radius: 10px;
}

/* Fallback CSS animations when WebGL fails */
.hero.no-webgl {
    background: linear-gradient(135deg, var(--bitcoin-black) 0%, var(--bitcoin-dark) 50%, var(--bitcoin-black) 100%);
    position: relative;
}

.hero.no-webgl::before {
    content: '';
    position: absolute;
    top: 50%;
    left: 50%;
    width: 100px;
    height: 100px;
    transform: translate(-50%, -50%);
    background: radial-gradient(circle, rgba(255, 179, 0, 0.3) 0%, transparent 70%);
    border-radius: 50%;
    animation: pulse-glow 2s ease-in-out infinite;
}

.hero.no-webgl::after {
    content: '';
    position: absolute;
    top: 20%;
    right: 20%;
    width: 200px;
    height: 200px;
    background: radial-gradient(circle, rgba(255, 215, 0, 0.2) 0%, transparent 60%);
    border-radius: 50%;
    animation: rotate-slow 10s linear infinite;
}

@keyframes pulse-glow {
    0%, 100% { opacity: 0.3; transform: scale(1); }
    50% { opacity: 0.6; transform: scale(1.1); }
}

@keyframes rotate-slow {
    0% { transform: rotate(0deg); }
    100% { transform: rotate(360deg); }
}

.hero-container {
    position: relative;
    z-index: 2;
}

.hero-container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 var(--spacing-sm);
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: var(--spacing-xxl);
    align-items: center;
}

.hero-title {
    font-size: clamp(2.5rem, 5vw, 4rem);
    font-weight: var(--font-weight-bold);
    line-height: 1.2;
    margin-bottom: var(--spacing-md);
}

.bitcoin-symbol {
    color: var(--primary);
    margin-right: var(--spacing-xs);
}

.hero-subtitle {
    font-size: 1.25rem;
    color: var(--text-secondary);
    margin-bottom: var(--spacing-lg);
    line-height: 1.6;
}

/* Price Ticker */
.price-ticker {
    background: var(--glass-bg);
    backdrop-filter: blur(10px);
    -webkit-backdrop-filter: blur(10px);
    border: 1px solid var(--glass-border);
    border-radius: var(--radius-lg);
    padding: var(--spacing-md);
    margin-bottom: var(--spacing-lg);
}

.price-display {
    display: flex;
    align-items: baseline;
    gap: var(--spacing-sm);
    margin-bottom: var(--spacing-xs);
}

.price-label {
    color: var(--text-secondary);
    font-weight: var(--font-weight-medium);
}

.price-value {
    font-size: 2rem;
    font-weight: var(--font-weight-bold);
    color: var(--primary);
}

.price-change {
    font-size: 1.1rem;
    font-weight: var(--font-weight-medium);
}

.price-change.positive {
    color: #4CAF50;
}

.price-change.negative {
    color: #F44336;
}

.price-updated {
    color: var(--text-secondary);
    font-size: 0.875rem;
}

.hero-buttons {
    display: flex;
    gap: var(--spacing-md);
    flex-wrap: wrap;
}

/* Buttons */
.btn {
    display: inline-block;
    padding: var(--spacing-sm) var(--spacing-md);
    border: none;
    border-radius: var(--radius-sm);
    text-decoration: none;
    font-weight: var(--font-weight-medium);
    text-align: center;
    cursor: pointer;
    transition: all 0.3s ease;
    font-size: 1rem;
}

.btn-primary {
    background: linear-gradient(45deg, var(--primary), var(--primary-dark));
    color: var(--text-primary);
    box-shadow: 0 4px 15px rgba(255, 179, 0, 0.3);
    backdrop-filter: blur(10px);
    -webkit-backdrop-filter: blur(10px);
}

.btn-primary:hover {
    background: linear-gradient(45deg, var(--primary-dark), var(--primary));
    box-shadow: 0 6px 20px rgba(255, 179, 0, 0.4);
    transform: translateY(-2px);
}

.btn-secondary {
    background: transparent;
    color: var(--text-primary);
    border: 2px solid var(--primary);
}

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

.btn-tool {
    background: var(--glass-bg);
    backdrop-filter: blur(10px);
    -webkit-backdrop-filter: blur(10px);
    border: 1px solid var(--glass-border);
    color: var(--text-primary);
    width: 100%;
    margin-top: var(--spacing-sm);
}

.btn-tool:hover {
    background: var(--primary);
    border-color: var(--primary);
}

/* Hero Visual */
.hero-visual {
    display: flex;
    justify-content: center;
    align-items: center;
}

.bitcoin-graphic {
    position: relative;
    width: 300px;
    height: 300px;
}

.bitcoin-icon {
    position: absolute;
    top: 50%;
    left: 50%;
    transform: translate(-50%, -50%);
    font-size: 4rem;
    color: var(--primary);
    z-index: 10;
}

.orbit {
    position: absolute;
    top: 50%;
    left: 50%;
    transform: translate(-50%, -50%);
    border: 1px solid var(--glass-border);
    border-radius: 50%;
    animation: rotate 20s linear infinite;
}

.orbit-1 {
    width: 100px;
    height: 100px;
    animation-duration: 15s;
}

.orbit-2 {
    width: 180px;
    height: 180px;
    animation-duration: 20s;
    animation-direction: reverse;
}

.orbit-3 {
    width: 260px;
    height: 260px;
    animation-duration: 25s;
}

@keyframes rotate {
    from {
        transform: translate(-50%, -50%) rotate(0deg);
    }
    to {
        transform: translate(-50%, -50%) rotate(360deg);
    }
}

/* Section Styles */
section {
    padding: var(--spacing-xxl) 0;
}

.section-title {
    font-size: 2.5rem;
    font-weight: var(--font-weight-bold);
    text-align: center;
    margin-bottom: var(--spacing-xl);
    position: relative;
}

.section-title::after {
    content: '';
    position: absolute;
    bottom: -10px;
    left: 50%;
    transform: translateX(-50%);
    width: 60px;
    height: 4px;
    background: var(--primary);
    border-radius: 2px;
}

/* Price Dashboard */
.price-dashboard {
    background: var(--glass-bg);
    backdrop-filter: blur(10px);
    -webkit-backdrop-filter: blur(10px);
    border-top: 1px solid var(--glass-border);
    border-bottom: 1px solid var(--glass-border);
}

.price-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
    gap: var(--spacing-md);
}

.price-card {
    background: var(--glass-bg);
    backdrop-filter: blur(5px);
    -webkit-backdrop-filter: blur(5px);
    border: 1px solid var(--glass-border);
    border-radius: var(--radius-lg);
    padding: var(--spacing-md);
    text-align: center;
}

.price-card h3 {
    font-size: 0.875rem;
    color: var(--text-secondary);
    margin-bottom: var(--spacing-xs);
    text-transform: uppercase;
    letter-spacing: 0.5px;
}

.price-info {
    display: flex;
    flex-direction: column;
    gap: var(--spacing-xs);
}

.price-main {
    font-size: 1.5rem;
    font-weight: var(--font-weight-bold);
    color: var(--primary);
}

.price-secondary {
    font-size: 1.1rem;
    font-weight: var(--font-weight-medium);
}

.price-trend {
    font-size: 1rem;
    font-weight: var(--font-weight-medium);
}

/* Tools Section */
.tools {
    background: var(--background);
}

.tools-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: var(--spacing-lg);
}

/* Large Desktop: 6 tools in 2 rows (3x2) */
@media (min-width: 1200px) {
    .tools-grid {
        grid-template-columns: repeat(3, 1fr);
    }
}

/* HD Monitor+: 6 tools in 2 rows (3x2) */
@media (min-width: 1536px) {
    .tools-grid {
        grid-template-columns: repeat(3, 1fr);
    }
}

/* Mobile: 1 column */
@media (max-width: 575.98px) {
    .tools-grid {
        grid-template-columns: 1fr;
    }
}

.tool-card {
    background: var(--glass-bg);
    backdrop-filter: blur(15px);
    -webkit-backdrop-filter: blur(15px);
    border: 1px solid var(--glass-border);
    border-radius: var(--radius-lg);
    padding: var(--spacing-md);
    text-align: center;
    box-shadow: var(--glass-shadow);
    transition: all 0.3s ease;
}

.tool-card:hover {
    background: var(--glass-bg-light);
    box-shadow: var(--glass-glow);
    transform: translateY(-5px);
}

.tool-icon {
    font-size: 3rem;
    margin-bottom: var(--spacing-md);
}

.tool-card h3 {
    font-size: 1.5rem;
    font-weight: var(--font-weight-semibold);
    margin-bottom: var(--spacing-sm);
}

.tool-card p {
    color: var(--text-secondary);
    margin-bottom: var(--spacing-md);
}

.tool-converter,
.fee-calculator,
.address-validator,
.profit-calculator {
    display: flex;
    flex-direction: column;
    gap: var(--spacing-sm);
    margin: var(--spacing-md) 0;
}

.tool-converter input,
.fee-calculator input,
.fee-calculator select,
.address-validator input,
.profit-calculator input {
    padding: var(--spacing-xs);
    border: 1px solid var(--glass-border);
    border-radius: var(--radius-sm);
    background: var(--glass-bg);
    backdrop-filter: blur(5px);
    -webkit-backdrop-filter: blur(5px);
    color: var(--text-primary);
    font-size: 1rem;
}

.converter-arrow {
    text-align: center;
    font-size: 1.2rem;
    color: var(--primary);
}

.fee-result,
.validation-result,
.profit-result {
    margin-top: var(--spacing-sm);
    padding: var(--spacing-xs);
    background: var(--glass-bg);
    border-radius: var(--radius-sm);
    border: 1px solid var(--glass-border);
    min-height: 40px;
    display: flex;
    align-items: center;
    justify-content: center;
}

/* Mempool Visualizer Styles */
.mempool-visualizer {
    display: flex;
    flex-direction: column;
    gap: var(--spacing-sm);
}

.mempool-status {
    display: flex;
    flex-direction: column;
    gap: var(--spacing-sm);
    margin-bottom: var(--spacing-sm);
}

.mempool-metric {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: var(--spacing-xs);
    background: var(--glass-bg);
    border-radius: var(--radius-sm);
    border: 1px solid var(--glass-border);
}

.metric-label {
    font-size: 0.9rem;
    color: var(--text-secondary);
}

.metric-value {
    font-weight: var(--font-weight-semibold);
    color: var(--text-primary);
}

.mempool-fees {
    display: flex;
    justify-content: space-between;
    gap: var(--spacing-xs);
    background: var(--glass-bg);
    border-radius: var(--radius-sm);
    border: 1px solid var(--glass-border);
    padding: var(--spacing-xs);
}

.fee-estimate {
    text-align: center;
    flex: 1;
}

.fee-label {
    display: block;
    font-size: 0.8rem;
    color: var(--text-secondary);
    margin-bottom: 2px;
}

.fee-value {
    font-weight: var(--font-weight-semibold);
    color: var(--primary);
    font-size: 0.9rem;
}

/* Block Time Calculator Styles */
.block-time-calculator {
    display: flex;
    flex-direction: column;
    gap: var(--spacing-sm);
}

.block-input {
    display: flex;
    flex-direction: column;
    gap: var(--spacing-xs);
}

.block-input label {
    font-size: 0.9rem;
    color: var(--text-secondary);
    font-weight: var(--font-weight-medium);
}

.block-input input {
    padding: var(--spacing-xs);
    border: 1px solid var(--glass-border);
    border-radius: var(--radius-sm);
    background: var(--glass-bg);
    color: var(--text-primary);
    font-size: 1rem;
}

.block-input input[readonly] {
    background: var(--glass-border);
    color: var(--text-secondary);
}

.block-result {
    margin-top: var(--spacing-sm);
    padding: var(--spacing-xs);
    background: var(--glass-bg);
    border-radius: var(--radius-sm);
    border: 1px solid var(--glass-border);
    display: flex;
    flex-direction: column;
    gap: var(--spacing-xs);
}

.result-item {
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.result-label {
    font-size: 0.9rem;
    color: var(--text-secondary);
}

.result-value {
    font-weight: var(--font-weight-semibold);
    color: var(--text-primary);
}

/* Learn Section */
.learn {
    background: var(--glass-bg);
    backdrop-filter: blur(10px);
    -webkit-backdrop-filter: blur(10px);
    border-top: 1px solid var(--glass-border);
    border-bottom: 1px solid var(--glass-border);
}

.learn-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: var(--spacing-lg);
}

.learn-card {
    background: var(--glass-bg);
    backdrop-filter: blur(5px);
    -webkit-backdrop-filter: blur(5px);
    border: 1px solid var(--glass-border);
    border-radius: var(--radius-lg);
    padding: var(--spacing-md);
}

.learn-icon {
    font-size: 3rem;
    margin-bottom: var(--spacing-md);
}

.learn-card h3 {
    font-size: 1.5rem;
    font-weight: var(--font-weight-semibold);
    margin-bottom: var(--spacing-sm);
}

.learn-card p {
    color: var(--text-secondary);
    margin-bottom: var(--spacing-md);
    line-height: 1.6;
}

.learn-points {
    list-style: none;
    text-align: left;
}

.learn-points li {
    padding: var(--spacing-xs) 0;
    color: var(--text-secondary);
    position: relative;
    padding-left: var(--spacing-md);
}

.learn-points li::before {
    content: '→';
    position: absolute;
    left: 0;
    color: var(--primary);
    font-weight: var(--font-weight-bold);
}

/* News Section */
.news {
    background: var(--background);
}

.news-container {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(350px, 1fr));
    gap: var(--spacing-md);
}

.news-item {
    background: var(--glass-bg);
    backdrop-filter: blur(10px);
    -webkit-backdrop-filter: blur(10px);
    border: 1px solid var(--glass-border);
    border-radius: var(--radius-lg);
    padding: var(--spacing-md);
    text-decoration: none;
    color: var(--text-primary);
    transition: transform 0.3s ease, box-shadow 0.3s ease;
}

.news-item:hover {
    transform: translateY(-5px);
    box-shadow: var(--shadow-lg);
}

.news-title {
    font-size: 1.1rem;
    font-weight: var(--font-weight-semibold);
    margin-bottom: var(--spacing-xs);
    line-height: 1.4;
}

.news-summary {
    color: var(--text-secondary);
    font-size: 0.9rem;
    margin-bottom: var(--spacing-sm);
    line-height: 1.5;
}

.news-meta {
    display: flex;
    justify-content: space-between;
    align-items: center;
    font-size: 0.8rem;
    color: var(--text-secondary);
}

.news-source {
    color: var(--primary);
    font-weight: var(--font-weight-medium);
}

/* Resources Section */
.resources {
    background: var(--glass-bg);
    backdrop-filter: blur(10px);
    -webkit-backdrop-filter: blur(10px);
    border-top: 1px solid var(--glass-border);
    border-bottom: 1px solid var(--glass-border);
}

.resources-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: var(--spacing-lg);
}

.resource-card {
    background: var(--glass-bg);
    backdrop-filter: blur(5px);
    -webkit-backdrop-filter: blur(5px);
    border: 1px solid var(--glass-border);
    border-radius: var(--radius-lg);
    padding: var(--spacing-md);
}

.resource-card h3 {
    font-size: 1.25rem;
    font-weight: var(--font-weight-semibold);
    margin-bottom: var(--spacing-sm);
}

.resource-card ul {
    list-style: none;
}

.resource-card li {
    margin-bottom: var(--spacing-xs);
}

.resource-card a {
    color: var(--text-secondary);
    text-decoration: none;
    transition: color 0.3s ease;
}

.resource-card a:hover {
    color: var(--primary);
}

/* About Section */
.about {
    background: var(--background);
}

.about-content {
    display: grid;
    grid-template-columns: 2fr 1fr;
    gap: var(--spacing-xxl);
    align-items: start;
}

.about-text p {
    color: var(--text-secondary);
    margin-bottom: var(--spacing-md);
    line-height: 1.7;
    font-size: 1.05rem;
}

.about-features {
    margin-top: var(--spacing-lg);
}

.feature-item {
    display: flex;
    align-items: center;
    gap: var(--spacing-sm);
    margin-bottom: var(--spacing-md);
    padding: var(--spacing-sm);
    background: var(--glass-bg);
    backdrop-filter: blur(5px);
    -webkit-backdrop-filter: blur(5px);
    border: 1px solid var(--glass-border);
    border-radius: var(--radius-sm);
}

.feature-icon {
    font-size: 1.5rem;
    color: var(--primary);
}

.about-stats {
    display: flex;
    flex-direction: column;
    gap: var(--spacing-md);
}

.stat-item {
    background: var(--glass-bg);
    backdrop-filter: blur(10px);
    -webkit-backdrop-filter: blur(10px);
    border: 1px solid var(--glass-border);
    border-radius: var(--radius-lg);
    padding: var(--spacing-md);
    text-align: center;
}

.stat-number {
    font-size: 2rem;
    font-weight: var(--font-weight-bold);
    color: var(--primary);
    margin-bottom: var(--spacing-xs);
}

.stat-label {
    color: var(--text-secondary);
    font-size: 0.9rem;
    text-transform: uppercase;
    letter-spacing: 0.5px;
}

/* Footer */
.footer {
    background: var(--bitcoin-darker);
    padding: var(--spacing-xl) 0 var(--spacing-md) 0;
    border-top: 1px solid var(--glass-border);
}

.footer-content {
    display: grid;
    grid-template-columns: 2fr 1fr 1fr 1fr;
    gap: var(--spacing-lg);
    margin-bottom: var(--spacing-lg);
}

.footer-section h3,
.footer-section h4 {
    margin-bottom: var(--spacing-sm);
    color: var(--text-primary);
}

.footer-section h3 {
    font-size: 1.25rem;
}

.footer-section h4 {
    font-size: 1.1rem;
    color: var(--primary);
}

.footer-section p {
    color: var(--text-secondary);
    line-height: 1.6;
}

.footer-section ul {
    list-style: none;
}

.footer-section li {
    margin-bottom: var(--spacing-xs);
}

.footer-section a {
    color: var(--text-secondary);
    text-decoration: none;
    transition: color 0.3s ease;
}

.footer-section a:hover {
    color: var(--primary);
}

.footer-bottom {
    border-top: 1px solid var(--glass-border);
    padding-top: var(--spacing-md);
    text-align: center;
}

.footer-bottom p {
    color: var(--text-secondary);
    font-size: 0.9rem;
}

/* Responsive Design */

/* Mobile First - Hide Mobile Menu Toggle on Desktop */
@media (min-width: 768px) {
    .mobile-menu-toggle {
        display: none;
    }
}

/* Mobile - Show Mobile Menu Toggle, Hide Desktop Menu */
@media (max-width: 767.98px) {
    .nav-menu {
        position: fixed;
        left: -100%;
        top: 70px;
        flex-direction: column;
        background: var(--glass-bg);
        backdrop-filter: blur(10px);
        -webkit-backdrop-filter: blur(10px);
        border: 1px solid var(--glass-border);
        width: 100%;
        text-align: center;
        transition: 0.3s;
        box-shadow: var(--shadow-lg);
    }

    .nav-menu.active {
        left: 0;
    }

    .nav-menu li {
        margin: var(--spacing-sm) 0;
    }

    .mobile-menu-toggle {
        display: flex;
    }

    .hero-container {
        grid-template-columns: 1fr;
        text-align: center;
        gap: var(--spacing-lg);
    }

    .hero-visual {
        order: -1;
    }

    .bitcoin-graphic {
        width: 200px;
        height: 200px;
    }

    .bitcoin-icon {
        font-size: 3rem;
    }

    .price-grid {
        grid-template-columns: repeat(2, 1fr);
    }

    .tools-grid {
        grid-template-columns: repeat(2, 1fr);
    }

    .learn-grid {
        grid-template-columns: 1fr;
    }

    .about-content {
        grid-template-columns: 1fr;
        gap: var(--spacing-lg);
    }

    .about-stats {
        grid-template-columns: repeat(3, 1fr);
        gap: var(--spacing-md);
    }

    .footer-content {
        grid-template-columns: 1fr;
        text-align: center;
    }

    .hero-buttons {
        justify-content: center;
    }
}

/* Ultra-Small Devices */
@media (max-width: 383.98px) {
    .container {
        padding: 0 var(--spacing-xs);
    }

    .nav-container {
        padding: 0 var(--spacing-xs);
    }

    .hero-title {
        font-size: clamp(2rem, 8vw, 3rem);
    }

    .price-display {
        flex-direction: column;
        align-items: flex-start;
        gap: var(--spacing-xs);
    }

    .price-value {
        font-size: 1.5rem;
    }

    .section-title {
        font-size: 2rem;
    }

    .price-grid {
        grid-template-columns: 1fr;
    }

    .tool-card,
    .learn-card,
    .resource-card {
        padding: var(--spacing-sm);
    }

    .about-stats {
        grid-template-columns: 1fr;
    }
}

/* Tablet Adjustments */
@media (min-width: 768px) and (max-width: 991.98px) {
    .hero-container {
        gap: var(--spacing-xl);
    }

    .bitcoin-graphic {
        width: 250px;
        height: 250px;
    }

    .about-stats {
        grid-template-columns: repeat(2, 1fr);
    }
}

/* Loading Animation */
.loading {
    display: inline-block;
    width: 20px;
    height: 20px;
    border: 3px solid var(--glass-border);
    border-radius: 50%;
    border-top-color: var(--primary);
    animation: spin 1s ease-in-out infinite;
}

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

/* Error State */
.error {
    color: #F44336;
    background: rgba(244, 67, 54, 0.1);
    border: 1px solid rgba(244, 67, 54, 0.3);
    padding: var(--spacing-xs);
    border-radius: var(--radius-sm);
}

/* Success State */
.success {
    color: #4CAF50;
    background: rgba(76, 175, 80, 0.1);
    border: 1px solid rgba(76, 175, 80, 0.3);
    padding: var(--spacing-xs);
    border-radius: var(--radius-sm);
}

/* Smooth Scroll */
html {
    scroll-behavior: smooth;
}

/* Focus States for Accessibility */
.btn:focus,
input:focus,
select:focus {
    outline: 2px solid var(--primary);
    outline-offset: 2px;
}

/* High Contrast Mode Support */
@media (prefers-contrast: high) {
    :root {
        --glass-bg: rgba(255, 255, 255, 0.2);
        --glass-border: rgba(255, 255, 255, 0.4);
    }
}

/* Reduced Motion Support */
@media (prefers-reduced-motion: reduce) {
    *,
    *::before,
    *::after {
        animation-duration: 0.01ms !important;
        animation-iteration-count: 1 !important;
        transition-duration: 0.01ms !important;
    }
}

/* Print Styles */
@media print {
    .navbar,
    .hero-buttons,
    .tool-card,
    .footer {
        display: none;
    }

    body {
        background: white;
        color: black;
    }

    .hero,
    .section {
        background: white;
        border: 1px solid black;
    }
}
/* Fallback data indicator styles */
.fallback-indicator {
    position: relative;
    opacity: 0.9;
    transition: opacity 0.3s ease;
}

.fallback-indicator:hover {
    opacity: 1;
}

.fallback-indicator::after {
    content: " *";
    color: var(--bitcoin-gold-light);
    font-size: 0.8em;
    margin-left: 4px;
}