/* ==========================================
   FLASH USDT - PREMIUM STYLESHEET
   Modern, Responsive, Animated Design
   ========================================== */

/* === ROOT VARIABLES === */
:root {
    /* Dark Mode as Default */
    --primary: #6366f1;
    --primary-dark: #4f46e5;
    --primary-light: #818cf8;
    --secondary: #8b5cf6;
    --accent: #ec4899;
    --success: #10b981;
    --warning: #f59e0b;
    --error: #ef4444;
    
    --bg-primary: #0f172a;
    --bg-secondary: #1e293b;
    --bg-tertiary: #334155;
    --text-primary: #f1f5f9;
    --text-secondary: #cbd5e1;
    --text-tertiary: #94a3b8;
    
    --border-color: #334155;
    --shadow-sm: 0 1px 2px 0 rgba(0, 0, 0, 0.3);
    --shadow-md: 0 4px 6px -1px rgba(0, 0, 0, 0.4);
    --shadow-lg: 0 10px 15px -3px rgba(0, 0, 0, 0.5);
    --shadow-xl: 0 20px 25px -5px rgba(0, 0, 0, 0.6);
    
    --gradient-primary: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    --gradient-secondary: linear-gradient(135deg, #f093fb 0%, #f5576c 100%);
    --gradient-hero: linear-gradient(135deg, #667eea 0%, #764ba2 50%, #f093fb 100%);
    
    --transition-fast: 0.2s ease;
    --transition-normal: 0.3s ease;
    --transition-slow: 0.5s ease;
    
    --radius-sm: 0.375rem;
    --radius-md: 0.5rem;
    --radius-lg: 0.75rem;
    --radius-xl: 1rem;
    --radius-2xl: 1.5rem;
    
    --container-width: 1200px;
}

/* === RESET & BASE === */
*, *::before, *::after {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

html {
    scroll-behavior: smooth;
    font-size: 16px;
}

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

/* === NAVIGATION === */
.navbar {
    background: var(--bg-primary);
    border-bottom: 1px solid var(--border-color);
    padding: 1rem 0;
    position: sticky;
    top: 0;
    z-index: 999;
    backdrop-filter: blur(10px);
    transition: all var(--transition-normal);
}

.navbar .container {
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.nav-brand {
    display: flex;
    align-items: center;
    gap: 0.75rem;
    font-size: 1.5rem;
    font-weight: 700;
}

.logo {
    font-size: 2rem;
    animation: pulse 2s ease-in-out infinite;
}

@keyframes pulse {
    0%, 100% { transform: scale(1); }
    50% { transform: scale(1.1); }
}

.brand-name {
    background: var(--gradient-primary);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.nav-links {
    display: flex;
    gap: 2rem;
    align-items: center;
}

.nav-link {
    color: var(--text-secondary);
    text-decoration: none;
    font-weight: 500;
    transition: color var(--transition-fast);
    position: relative;
}

.nav-link::after {
    content: '';
    position: absolute;
    bottom: -5px;
    left: 0;
    width: 0;
    height: 2px;
    background: var(--primary);
    transition: width var(--transition-normal);
}

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

.nav-link:hover::after {
    width: 100%;
}

/* === CONTAINER === */
.container {
    max-width: var(--container-width);
    margin: 0 auto;
    padding: 0 2rem;
}

/* === HERO SECTION === */
.hero {
    position: relative;
    min-height: 100vh;
    display: flex;
    align-items: center;
    justify-content: center;
    overflow: hidden;
    padding: 6rem 0 4rem;
}

.hero-background {
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    z-index: -1;
    background: var(--gradient-hero);
    opacity: 0.1;
}

.gradient-sphere {
    position: absolute;
    border-radius: 50%;
    filter: blur(80px);
    animation: float 20s ease-in-out infinite;
}

.sphere-1 {
    width: 500px;
    height: 500px;
    background: var(--primary);
    top: -10%;
    left: -10%;
    animation-delay: 0s;
}

.sphere-2 {
    width: 400px;
    height: 400px;
    background: var(--secondary);
    bottom: -10%;
    right: -10%;
    animation-delay: 7s;
}

.sphere-3 {
    width: 300px;
    height: 300px;
    background: var(--accent);
    top: 50%;
    left: 50%;
    animation-delay: 14s;
}

@keyframes float {
    0%, 100% { transform: translate(0, 0); }
    33% { transform: translate(100px, -100px); }
    66% { transform: translate(-100px, 100px); }
}

.hero-content {
    position: relative;
    z-index: 2;
    text-align: center;
}

.hero-title {
    font-size: clamp(2.5rem, 6vw, 4.5rem);
    font-weight: 800;
    line-height: 1.1;
    margin-bottom: 1.5rem;
}

.gradient-text {
    background: var(--gradient-primary);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.hero-subtitle {
    font-size: clamp(1.125rem, 2vw, 1.5rem);
    color: var(--text-secondary);
    max-width: 700px;
    margin: 0 auto 3rem;
}

.hero-features {
    display: flex;
    gap: 2rem;
    justify-content: center;
    flex-wrap: wrap;
    margin-bottom: 3rem;
}

.hero-feature {
    display: flex;
    align-items: center;
    gap: 0.5rem;
    padding: 0.75rem 1.5rem;
    background: var(--bg-secondary);
    border-radius: var(--radius-lg);
    box-shadow: var(--shadow-md);
}

.feature-icon {
    font-size: 1.5rem;
}

.hero-cta {
    display: flex;
    gap: 1rem;
    justify-content: center;
    flex-wrap: wrap;
}

.scroll-indicator {
    position: absolute;
    bottom: 2rem;
    left: 50%;
    transform: translateX(-50%);
    animation: bounce 2s infinite;
}

.scroll-arrow {
    font-size: 2rem;
    color: var(--text-tertiary);
}

@keyframes bounce {
    0%, 100% { transform: translateX(-50%) translateY(0); }
    50% { transform: translateX(-50%) translateY(10px); }
}

/* === BUTTONS === */
.btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    padding: 0.75rem 2rem;
    font-size: 1rem;
    font-weight: 600;
    text-decoration: none;
    border-radius: var(--radius-lg);
    transition: all var(--transition-normal);
    cursor: pointer;
    border: none;
    font-family: inherit;
}

.btn-primary {
    background: var(--gradient-primary);
    color: white;
    box-shadow: var(--shadow-md);
}

.btn-primary:hover {
    transform: translateY(-2px);
    box-shadow: var(--shadow-xl);
}

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

.btn-outline:hover {
    background: var(--primary);
    color: white;
}

.btn-large {
    padding: 1rem 3rem;
    font-size: 1.125rem;
}

.btn-pulse {
    animation: pulse-btn 2s ease-in-out infinite;
}

@keyframes pulse-btn {
    0%, 100% { box-shadow: 0 0 0 0 rgba(99, 102, 241, 0.7); }
    50% { box-shadow: 0 0 0 20px rgba(99, 102, 241, 0); }
}

/* === SECTIONS === */
section {
    padding: 6rem 0;
}

.section-header {
    text-align: center;
    max-width: 800px;
    margin: 0 auto 4rem;
}

.section-title {
    font-size: clamp(2rem, 4vw, 3rem);
    font-weight: 700;
    margin-bottom: 1rem;
}

.section-description {
    font-size: 1.125rem;
    color: var(--text-secondary);
    line-height: 1.8;
}

/* === ANIMATIONS === */
.fade-in {
    animation: fadeIn 1s ease-out;
}

.fade-in-up {
    animation: fadeInUp 1s ease-out;
}

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

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

/* === ABOUT SECTION === */
.about {
    background: var(--bg-secondary);
}

.about-cards {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: 2rem;
}

.about-card {
    background: var(--bg-primary);
    padding: 2.5rem;
    border-radius: var(--radius-xl);
    box-shadow: var(--shadow-lg);
    transition: transform var(--transition-normal), box-shadow var(--transition-normal);
    text-align: center;
}

.about-card:hover {
    transform: translateY(-10px);
    box-shadow: var(--shadow-xl);
}

.card-icon {
    font-size: 3rem;
    margin-bottom: 1rem;
}

.about-card h3 {
    font-size: 1.5rem;
    margin-bottom: 1rem;
    color: var(--text-primary);
}

.about-card p {
    color: var(--text-secondary);
    line-height: 1.7;
}

/* === FEATURES SECTION === */
.features-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
    gap: 2rem;
}

.feature-card {
    background: var(--bg-secondary);
    padding: 2rem;
    border-radius: var(--radius-xl);
    border: 1px solid var(--border-color);
    transition: all var(--transition-normal);
}

.feature-card:hover {
    transform: translateY(-5px);
    border-color: var(--primary);
    box-shadow: var(--shadow-xl);
}

.feature-icon {
    font-size: 2.5rem;
    display: block;
    margin-bottom: 1rem;
}

.feature-card h3 {
    font-size: 1.25rem;
    margin-bottom: 0.75rem;
}

.feature-card p {
    color: var(--text-secondary);
}

/* === PRICING SECTION === */
.pricing {
    background: var(--bg-secondary);
}

.pricing-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
    gap: 2rem;
}

.pricing-card {
    background: var(--bg-primary);
    padding: 2.5rem;
    border-radius: var(--radius-2xl);
    border: 2px solid var(--border-color);
    transition: all var(--transition-normal);
    position: relative;
    overflow: hidden;
}

.pricing-card::before {
    content: '';
    position: absolute;
    top: 0;
    left: -100%;
    width: 100%;
    height: 100%;
    background: linear-gradient(90deg, transparent, rgba(99, 102, 241, 0.1), transparent);
    transition: left 0.5s;
}

.pricing-card:hover::before {
    left: 100%;
}

.pricing-card:hover {
    transform: translateY(-10px);
    border-color: var(--primary);
    box-shadow: var(--shadow-xl);
}

.pricing-card.featured {
    border-color: var(--primary);
    box-shadow: 0 0 0 4px rgba(99, 102, 241, 0.1);
    transform: scale(1.05);
}

.plan-badge {
    display: inline-block;
    padding: 0.5rem 1rem;
    background: var(--primary-light);
    color: white;
    border-radius: var(--radius-lg);
    font-size: 0.875rem;
    font-weight: 600;
    margin-bottom: 1.5rem;
}

.plan-badge.best-value {
    background: linear-gradient(135deg, #f093fb 0%, #f5576c 100%);
}

.plan-badge.premium {
    background: linear-gradient(135deg, #ffd89b 0%, #19547b 100%);
}

.plan-header {
    text-align: center;
    margin-bottom: 2rem;
    padding-bottom: 2rem;
    border-bottom: 1px solid var(--border-color);
}

.plan-name {
    font-size: 1.5rem;
    font-weight: 700;
    margin-bottom: 1rem;
}

.plan-price {
    display: flex;
    align-items: flex-start;
    justify-content: center;
    margin-bottom: 0.5rem;
}

.plan-price .currency {
    font-size: 1.5rem;
    font-weight: 600;
    margin-top: 0.5rem;
}

.plan-price .amount {
    font-size: 3.5rem;
    font-weight: 800;
    line-height: 1;
}

.plan-tokens {
    color: var(--text-secondary);
    font-size: 1.125rem;
}

.plan-features {
    list-style: none;
    margin-bottom: 2rem;
}

.plan-features li {
    padding: 0.75rem 0;
    color: var(--text-secondary);
    border-bottom: 1px solid var(--border-color);
}

.plan-features li:last-child {
    border-bottom: none;
}

.btn-plan {
    width: 100%;
}

/* === CONTACT SECTION === */
.contact-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: 2rem;
}

.contact-card {
    background: var(--bg-secondary);
    padding: 2.5rem;
    border-radius: var(--radius-xl);
    text-align: center;
    transition: all var(--transition-normal);
}

.contact-card:hover {
    transform: translateY(-5px);
    box-shadow: var(--shadow-xl);
}

.contact-icon {
    font-size: 3rem;
    margin-bottom: 1rem;
}

.contact-card h3 {
    font-size: 1.25rem;
    margin-bottom: 0.5rem;
}

.contact-card p {
    color: var(--text-secondary);
}

/* === FOOTER === */
.footer {
    background: var(--bg-secondary);
    padding: 3rem 0 1rem;
    border-top: 1px solid var(--border-color);
}

.footer-content {
    display: grid;
    grid-template-columns: 2fr 1fr 1fr 1fr;
    gap: 3rem;
    margin-bottom: 3rem;
}

.footer-brand {
    display: flex;
    flex-direction: column;
    gap: 1rem;
}

.footer-tagline {
    color: var(--text-secondary);
    margin-top: 0.5rem;
}

.footer-section h4 {
    margin-bottom: 1rem;
    font-size: 1.125rem;
}

.footer-section a {
    display: block;
    color: var(--text-secondary);
    text-decoration: none;
    margin-bottom: 0.75rem;
    transition: color var(--transition-fast);
}

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

.footer-bottom {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding-top: 2rem;
    border-top: 1px solid var(--border-color);
    color: var(--text-tertiary);
}

.social-links {
    display: flex;
    gap: 1rem;
}

.social-links a {
    display: flex;
    align-items: center;
    justify-content: center;
    width: 40px;
    height: 40px;
    background: var(--bg-tertiary);
    color: var(--text-secondary);
    text-decoration: none;
    border-radius: 50%;
    transition: all var(--transition-fast);
}

.social-links a:hover {
    background: var(--primary);
    color: white;
    transform: translateY(-3px);
}

/* === PLAN DETAIL PAGE === */
.plan-detail {
    padding: 4rem 0;
    min-height: 100vh;
}

.plan-detail-header {
    text-align: center;
    margin-bottom: 4rem;
}

.plan-badge-large {
    display: inline-block;
    padding: 0.75rem 1.5rem;
    background: var(--primary);
    color: white;
    border-radius: var(--radius-lg);
    font-size: 1rem;
    font-weight: 600;
    margin-bottom: 1rem;
}

.plan-badge-large.popular {
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
}

.plan-badge-large.best-value {
    background: linear-gradient(135deg, #f093fb 0%, #f5576c 100%);
}

.plan-badge-large.business {
    background: linear-gradient(135deg, #4facfe 0%, #00f2fe 100%);
}

.plan-badge-large.premium {
    background: linear-gradient(135deg, #ffd89b 0%, #19547b 100%);
}

.plan-detail-title {
    font-size: clamp(2.5rem, 5vw, 4rem);
    margin-bottom: 1rem;
}

.plan-detail-subtitle {
    font-size: 1.25rem;
    color: var(--text-secondary);
}

.plan-detail-content {
    display: grid;
    grid-template-columns: 2fr 1fr;
    gap: 3rem;
}

.plan-detail-card {
    background: var(--bg-secondary);
    padding: 3rem;
    border-radius: var(--radius-2xl);
    box-shadow: var(--shadow-xl);
}

.elite-card {
    border: 2px solid transparent;
    background: linear-gradient(var(--bg-secondary), var(--bg-secondary)) padding-box,
                linear-gradient(135deg, #ffd89b 0%, #19547b 100%) border-box;
}

.plan-price-section {
    text-align: center;
    padding: 2rem;
    background: var(--bg-primary);
    border-radius: var(--radius-xl);
    margin-bottom: 3rem;
}

.plan-price-large {
    display: flex;
    align-items: flex-start;
    justify-content: center;
    margin-bottom: 1rem;
}

.plan-price-large .currency {
    font-size: 2rem;
    font-weight: 600;
    margin-top: 0.75rem;
}

.plan-price-large .amount {
    font-size: 5rem;
    font-weight: 800;
    line-height: 1;
    background: var(--gradient-primary);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.plan-tokens-large {
    font-size: 1.5rem;
    color: var(--text-secondary);
    font-weight: 600;
}

.plan-tokens-large.unlimited {
    background: linear-gradient(135deg, #ffd89b 0%, #19547b 100%);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.plan-specs h2,
.plan-features-section h2 {
    font-size: 1.75rem;
    margin-bottom: 1.5rem;
}

.spec-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
    gap: 1.5rem;
    margin-bottom: 3rem;
}

.spec-item {
    display: flex;
    gap: 1rem;
    padding: 1.5rem;
    background: var(--bg-primary);
    border-radius: var(--radius-lg);
    transition: transform var(--transition-fast);
}

.spec-item:hover {
    transform: translateY(-3px);
}

.spec-icon {
    font-size: 2rem;
}

.spec-content h3 {
    font-size: 0.875rem;
    color: var(--text-tertiary);
    margin-bottom: 0.25rem;
}

.spec-content p {
    font-size: 1rem;
    font-weight: 600;
    color: var(--text-primary);
}

.price-highlight {
    color: var(--primary);
    font-size: 1.25rem !important;
}

.unlimited-text {
    background: linear-gradient(135deg, #ffd89b 0%, #19547b 100%);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.feature-list {
    list-style: none;
    display: grid;
    gap: 0.75rem;
}

.feature-list li {
    padding: 0.75rem 1rem;
    background: var(--bg-primary);
    border-radius: var(--radius-md);
    color: var(--text-secondary);
}

.elite-perks {
    margin: 3rem 0;
    padding: 2rem;
    background: linear-gradient(135deg, rgba(255, 216, 155, 0.1) 0%, rgba(25, 84, 123, 0.1) 100%);
    border-radius: var(--radius-xl);
}

.perks-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
    gap: 1.5rem;
    margin-top: 1.5rem;
}

.perk-item {
    text-align: center;
    padding: 1.5rem;
    background: var(--bg-primary);
    border-radius: var(--radius-lg);
}

.perk-icon {
    font-size: 2.5rem;
    display: block;
    margin-bottom: 0.75rem;
}

.perk-item h4 {
    font-size: 1.125rem;
    margin-bottom: 0.5rem;
}

.perk-item p {
    font-size: 0.875rem;
    color: var(--text-secondary);
}

.plan-cta {
    text-align: center;
    margin-top: 3rem;
}

.plan-cta-note {
    margin-top: 1rem;
    color: var(--text-tertiary);
    font-size: 0.875rem;
}

.elite-btn {
    background: linear-gradient(135deg, #ffd89b 0%, #19547b 100%);
}

.plan-sidebar {
    display: flex;
    flex-direction: column;
    gap: 1.5rem;
}

.sidebar-card {
    background: var(--bg-secondary);
    padding: 2rem;
    border-radius: var(--radius-xl);
    box-shadow: var(--shadow-md);
}

.sidebar-card.highlight {
    border: 2px solid var(--primary);
    background: linear-gradient(135deg, rgba(99, 102, 241, 0.1) 0%, rgba(139, 92, 246, 0.1) 100%);
}

.sidebar-card.elite-sidebar {
    background: linear-gradient(135deg, rgba(255, 216, 155, 0.1) 0%, rgba(25, 84, 123, 0.1) 100%);
}

.sidebar-card h3 {
    font-size: 1.25rem;
    margin-bottom: 1rem;
}

.sidebar-card p {
    color: var(--text-secondary);
    margin-bottom: 1rem;
}

.quick-facts {
    list-style: none;
    display: grid;
    gap: 0.5rem;
}

.quick-facts li {
    padding: 0.5rem 0;
    color: var(--text-secondary);
}

/* === PAYMENT PAGE === */
.payment-section {
    padding: 4rem 0;
    min-height: 100vh;
}

.payment-header {
    text-align: center;
    margin-bottom: 3rem;
}

.payment-header h1 {
    font-size: 2.5rem;
    margin-bottom: 1rem;
}

.payment-plan-name {
    font-size: 1.5rem;
    color: var(--primary);
    font-weight: 600;
}

.payment-timer {
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 1.5rem;
    margin: 2rem auto;
    padding: 2rem;
    background: var(--bg-secondary);
    border-radius: var(--radius-xl);
    max-width: 500px;
    box-shadow: var(--shadow-lg);
}

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

.timer-label {
    font-size: 0.875rem;
    color: var(--text-tertiary);
    margin-bottom: 0.5rem;
}

.timer-display {
    font-size: 3rem;
    font-weight: 800;
    color: var(--primary);
    font-variant-numeric: tabular-nums;
}

.timer-display.warning {
    color: var(--error);
    animation: pulse 1s ease-in-out infinite;
}

.timer-note {
    font-size: 0.875rem;
    color: var(--text-tertiary);
    margin-top: 0.5rem;
}

.payment-content {
    display: grid;
    grid-template-columns: 2fr 1fr;
    gap: 3rem;
}

.payment-instructions {
    display: flex;
    flex-direction: column;
    gap: 2rem;
}

.instruction-card {
    background: var(--bg-secondary);
    padding: 2.5rem;
    border-radius: var(--radius-xl);
    box-shadow: var(--shadow-md);
}

.instruction-card h2 {
    font-size: 1.75rem;
    margin-bottom: 1.5rem;
}

.payment-amount-box {
    text-align: center;
    padding: 2rem;
    background: var(--bg-primary);
    border: 2px solid var(--primary);
    border-radius: var(--radius-lg);
    margin-bottom: 2rem;
}

.amount-label {
    font-size: 0.875rem;
    color: var(--text-tertiary);
    margin-bottom: 0.5rem;
}

.amount-value {
    font-size: 3rem;
    font-weight: 800;
    color: var(--primary);
    margin-bottom: 0.5rem;
}

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

.instruction-steps {
    display: flex;
    flex-direction: column;
    gap: 1rem;
}

.step {
    display: flex;
    gap: 1rem;
    align-items: flex-start;
}

.step-number {
    display: flex;
    align-items: center;
    justify-content: center;
    min-width: 32px;
    height: 32px;
    background: var(--primary);
    color: white;
    border-radius: 50%;
    font-weight: 600;
}

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

.payment-networks {
    display: flex;
    flex-direction: column;
    gap: 1.5rem;
}

.payment-networks h2 {
    font-size: 1.5rem;
    margin-bottom: 1rem;
}

.network-card {
    background: var(--bg-secondary);
    padding: 2rem;
    border-radius: var(--radius-xl);
    box-shadow: var(--shadow-md);
    transition: all var(--transition-normal);
}

.network-card:hover {
    box-shadow: var(--shadow-xl);
    transform: translateY(-3px);
}

.network-header {
    display: flex;
    justify-content: space-between;
    align-items: flex-start;
    margin-bottom: 1.5rem;
}

.network-info h3 {
    font-size: 1.25rem;
    margin-bottom: 0.5rem;
}

.network-info p {
    font-size: 0.875rem;
    color: var(--text-tertiary);
}

.copy-btn {
    padding: 0.5rem 1rem;
    background: var(--primary);
    color: white;
    border: none;
    border-radius: var(--radius-md);
    font-weight: 600;
    cursor: pointer;
    transition: all var(--transition-fast);
}

.copy-btn:hover {
    background: var(--primary-dark);
    transform: translateY(-2px);
}

.network-content {
    display: grid;
    grid-template-columns: auto 1fr;
    gap: 2rem;
    align-items: center;
}

.qr-code {
    text-align: center;
}

.qr-code svg {
    width: 150px;
    height: 150px;
    border: 2px solid var(--border-color);
    border-radius: var(--radius-md);
    padding: 0.5rem;
    background: white;
}

.qr-label {
    margin-top: 0.5rem;
    font-size: 0.875rem;
    color: var(--text-tertiary);
}

.address-box {
    flex: 1;
}

.address-label {
    font-size: 0.875rem;
    color: var(--text-tertiary);
    margin-bottom: 0.5rem;
}

.address-input {
    width: 100%;
    padding: 1rem;
    background: var(--bg-primary);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-md);
    font-family: 'Courier New', monospace;
    font-size: 0.875rem;
    color: var(--text-primary);
    margin-bottom: 0.75rem;
}

.network-warning {
    font-size: 0.875rem;
    color: var(--warning);
    font-weight: 600;
}

.payment-form-container {
    background: var(--bg-secondary);
    padding: 2.5rem;
    border-radius: var(--radius-xl);
    box-shadow: var(--shadow-md);
}

.payment-form-container h2 {
    font-size: 1.75rem;
    margin-bottom: 2rem;
}

.payment-form {
    display: flex;
    flex-direction: column;
    gap: 1.5rem;
}

.form-group label {
    display: block;
    font-weight: 600;
    margin-bottom: 0.5rem;
    color: var(--text-primary);
}

.form-group input,
.form-group select {
    width: 100%;
    padding: 0.875rem 1rem;
    background: var(--bg-primary);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-md);
    font-family: inherit;
    font-size: 1rem;
    color: var(--text-primary);
    transition: border-color var(--transition-fast);
}

.form-group input:focus,
.form-group select:focus {
    outline: none;
    border-color: var(--primary);
}

.field-note {
    font-size: 0.875rem;
    color: var(--text-tertiary);
    margin-top: 0.5rem;
}

.form-checkbox {
    display: flex;
    gap: 0.75rem;
    align-items: flex-start;
}

.form-checkbox input[type="checkbox"] {
    margin-top: 0.25rem;
    min-width: 18px;
    height: 18px;
}

.form-checkbox label {
    font-weight: normal;
    color: var(--text-secondary);
    cursor: pointer;
}

.btn-submit {
    margin-top: 1rem;
}

.payment-sidebar {
    display: flex;
    flex-direction: column;
    gap: 1.5rem;
}

.order-summary {
    display: flex;
    flex-direction: column;
    gap: 0.75rem;
}

.summary-item {
    display: flex;
    justify-content: space-between;
    padding: 0.75rem 0;
    border-bottom: 1px solid var(--border-color);
}

.summary-item.total {
    font-size: 1.25rem;
    font-weight: 700;
    border-bottom: none;
    margin-top: 0.5rem;
    padding-top: 1rem;
    border-top: 2px solid var(--border-color);
}

.note-list {
    list-style: none;
    display: flex;
    flex-direction: column;
    gap: 0.75rem;
}

.note-list li {
    padding-left: 1.5rem;
    position: relative;
    color: var(--text-secondary);
    font-size: 0.875rem;
}

.note-list li::before {
    content: '•';
    position: absolute;
    left: 0;
    color: var(--primary);
    font-size: 1.5rem;
    line-height: 1;
}

/* === MODAL === */
.modal {
    display: none;
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: rgba(0, 0, 0, 0.7);
    backdrop-filter: blur(5px);
    z-index: 10000;
    align-items: center;
    justify-content: center;
    animation: fadeIn 0.3s;
}

.modal-content {
    background: var(--bg-primary);
    padding: 3rem;
    border-radius: var(--radius-2xl);
    max-width: 500px;
    text-align: center;
    box-shadow: var(--shadow-xl);
    animation: fadeInUp 0.3s;
}

.modal-icon {
    font-size: 4rem;
    margin-bottom: 1rem;
}

.modal-content h2 {
    font-size: 1.75rem;
    margin-bottom: 1rem;
}

.modal-content p {
    color: var(--text-secondary);
    margin-bottom: 0.75rem;
}

.modal-detail {
    font-size: 1.125rem;
}

.modal-note {
    font-size: 0.875rem;
    color: var(--text-tertiary);
    margin-top: 1rem;
}

.modal-content .btn {
    margin-top: 2rem;
}

/* === RESPONSIVE DESIGN === */
@media (max-width: 1024px) {
    .plan-detail-content,
    .payment-content {
        grid-template-columns: 1fr;
    }
    
    .footer-content {
        grid-template-columns: 1fr 1fr;
    }
}

@media (max-width: 768px) {
    .container {
        padding: 0 1.5rem;
    }
    
    .navbar {
        z-index: 999;
    }
    
    .nav-links {
        gap: 1rem;
        font-size: 0.9rem;
    }
    
    .hero {
        min-height: 80vh;
        padding: 4rem 0 2rem;
    }
    
    .hero-features {
        gap: 1rem;
    }
    
    .hero-feature {
        font-size: 0.875rem;
        padding: 0.5rem 1rem;
    }
    
    .hero-cta {
        flex-direction: column;
    }
    
    .btn-large {
        width: 100%;
    }
    
    section {
        padding: 4rem 0;
    }
    
    .pricing-grid,
    .features-grid,
    .about-cards,
    .contact-grid {
        grid-template-columns: 1fr;
    }
    
    .pricing-card.featured {
        transform: none;
    }
    
    .footer-content {
        grid-template-columns: 1fr;
        gap: 2rem;
    }
    
    .footer-bottom {
        flex-direction: column;
        gap: 1rem;
        text-align: center;
    }
    
    .spec-grid {
        grid-template-columns: 1fr;
    }
    
    .network-content {
        grid-template-columns: 1fr;
    }
    
    .payment-timer {
        flex-direction: column;
        gap: 1rem;
    }
    
    .plan-price-large .amount {
        font-size: 4rem;
    }
    
    .modal-content {
        margin: 1rem;
        padding: 2rem;
    }
}

@media (max-width: 480px) {
    .nav-brand {
        font-size: 1.25rem;
    }
    
    .logo {
        font-size: 1.5rem;
    }
    
    .nav-links {
        gap: 0.5rem;
        font-size: 0.85rem;
    }
    
    .nav-link {
        padding: 0.25rem 0.5rem;
    }
    
    .hero-title {
        font-size: 2rem;
    }
    
    .section-title {
        font-size: 1.75rem;
    }
    
    .plan-detail-card,
    .payment-form-container,
    .instruction-card {
        padding: 1.5rem;
    }
    
    .amount-value {
        font-size: 2.5rem;
    }
    
    .timer-display {
        font-size: 2.5rem;
    }
}

/* === UTILITY CLASSES === */
.text-center { text-align: center; }
.text-left { text-align: left; }
.text-right { text-align: right; }
.mt-1 { margin-top: 0.5rem; }
.mt-2 { margin-top: 1rem; }
.mt-3 { margin-top: 1.5rem; }
.mb-1 { margin-bottom: 0.5rem; }
.mb-2 { margin-bottom: 1rem; }
.mb-3 { margin-bottom: 1.5rem; }
.p-0 { padding: 0; }
.hidden { display: none; }