:root {
    --primary: #00D2FF;
    --primary-dark: #009ACB;
    --secondary: #7B2CBF;
    --accent: #F72585;
    --dark-bg: #0f172a;
    --card-bg: #1e293b;
    --text-main: #f8fafc;
    --text-muted: #94a3b8;
    --success: #10b981;
    --warning: #f59e0b;
}

* { margin: 0; padding: 0; box-sizing: border-box; -webkit-tap-highlight-color: transparent; }

html { scroll-behavior: smooth; }

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

a { text-decoration: none; color: inherit; transition: 0.3s; }
ul { list-style: none; }
button { cursor: pointer; border: none; background: none; font-family: inherit; }
input { font-family: inherit; }

/* Toast Notification */
#toast {
    visibility: hidden;
    min-width: 250px;
    background-color: rgba(0, 0, 0, 0.85);
    backdrop-filter: blur(5px);
    color: #fff;
    text-align: center;
    border-radius: 50px;
    padding: 16px 24px;
    position: fixed;
    z-index: 9999;
    left: 50%;
    bottom: 30px;
    transform: translateX(-50%) translateY(20px);
    font-size: 1rem;
    opacity: 0;
    transition: all 0.3s ease;
    box-shadow: 0 10px 30px rgba(0,0,0,0.5);
    border: 1px solid rgba(255,255,255,0.1);
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 10px;
}

#toast.show {
    visibility: visible;
    opacity: 1;
    bottom: 50px;
    transform: translateX(-50%) translateY(0);
}

/* Header */
header {
    background: rgba(15, 23, 42, 0.98);
    backdrop-filter: blur(10px);
    position: fixed;
    width: 100%;
    top: 0;
    z-index: 1000;
    border-bottom: 1px solid rgba(255,255,255,0.1);
}

.container {
    max-width: 1280px;
    margin: 0 auto;
    padding: 0 20px;
}

.nav-wrapper {
    display: flex;
    justify-content: space-between;
    align-items: center;
    height: 70px;
    position: relative;
}

.logo {
    font-size: 1.5rem;
    font-weight: 900;
    letter-spacing: -0.5px;
    display: flex;
    align-items: center;
    gap: 10px;
}

.logo-icon {
    width: 32px;
    height: 32px;
    border-radius: 8px;
    display: flex;
    align-items: center;
    justify-content: center;
    box-shadow: 0 0 15px rgba(0, 210, 255, 0.4);
    overflow: hidden;
}

.logo-icon img { display: block; width: 100%; height: 100%; }

.logo-text {
    background: linear-gradient(to right, #fff, var(--primary));
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
}

.nav-links {
    display: flex;
    gap: 25px;
}

.nav-links a {
    font-weight: 500;
    color: var(--text-muted);
    font-size: 0.95rem;
}

.nav-links a:hover, .nav-links a.active {
    color: var(--primary);
}

.lang-btn {
    background: rgba(255,255,255,0.05);
    border: 1px solid rgba(255,255,255,0.1);
    border-radius: 20px;
    padding: 6px 14px;
    font-size: 0.85rem;
    color: var(--text-main);
    display: flex;
    align-items: center;
    gap: 6px;
    transition: all 0.3s;
    position: relative;
    z-index: 1002;
}

.lang-btn:hover {
    background: rgba(255,255,255,0.1);
    border-color: var(--primary);
}

.lang-list {
    position: absolute;
    top: 100%;
    right: 20px;
    background: var(--card-bg);
    border: 1px solid rgba(255,255,255,0.1);
    border-radius: 12px;
    width: 200px;
    display: none;
    flex-direction: column;
    overflow: hidden;
    box-shadow: 0 10px 25px rgba(0,0,0,0.5);
    margin-top: 10px;
    z-index: 1001;
}

.lang-list.show { display: flex; }

.lang-list a {
    padding: 12px 20px;
    color: var(--text-main);
    display: flex;
    align-items: center;
    gap: 10px;
    border-bottom: 1px solid rgba(255,255,255,0.05);
    font-size: 0.9rem;
}

.lang-list a:last-child { border-bottom: none; }
.lang-list a:hover { background: rgba(0, 210, 255, 0.1); color: var(--primary); }

/* Hero Section */
.hero {
    padding: 100px 0 50px;
    text-align: center;
    background: linear-gradient(rgba(15, 23, 42, 0.85), rgba(15, 23, 42, 0.95)), 
                radial-gradient(circle at center, rgba(123, 44, 191, 0.2) 0%, rgba(15, 23, 42, 0) 70%);
}

.hero h1 {
    font-size: 2.8rem;
    margin-bottom: 20px;
    line-height: 1.2;
    background: linear-gradient(135deg, #fff 0%, var(--primary) 50%, var(--secondary) 100%);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
}

.hero p {
    font-size: 1.1rem;
    color: var(--text-muted);
    max-width: 700px;
    margin: 0 auto 40px;
    line-height: 1.7;
}

.hero-buttons {
    display: flex;
    gap: 15px;
    justify-content: center;
    flex-wrap: wrap;
}

.btn-hero {
    padding: 14px 30px;
    border-radius: 50px;
    font-weight: 700;
    font-size: 1rem;
    transition: all 0.3s;
}

.btn-primary {
    background: linear-gradient(45deg, var(--primary), var(--secondary));
    color: white;
    box-shadow: 0 10px 30px rgba(0, 210, 255, 0.3);
}

.btn-primary:hover {
    transform: translateY(-3px);
    box-shadow: 0 15px 40px rgba(0, 210, 255, 0.4);
}

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

.btn-outline:hover {
    background: var(--primary);
    color: white;
    transform: translateY(-3px);
}

/* Stats Section */
.stats-section {
    padding: 25px 0;
    background: rgba(0,0,0,0.2);
    border-top: 1px solid rgba(255,255,255,0.05);
    border-bottom: 1px solid rgba(255,255,255,0.05);
}

.stats-bar {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(140px, 1fr));
    gap: 20px;
    background: rgba(255,255,255,0.05);
    backdrop-filter: blur(10px);
    padding: 30px 20px;
    border-radius: 20px;
    border: 1px solid rgba(255,255,255,0.1);
}

.stat-item { text-align: center; }

.stat-value {
    font-size: 2rem;
    font-weight: 800;
    background: linear-gradient(to right, var(--primary), var(--accent));
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    margin-bottom: 5px;
}

.stat-label { font-size: 0.9rem; color: var(--text-muted); font-weight: 500; }

/* Main Layout */
.main-layout {
    display: grid;
    grid-template-columns: 1fr 320px;
    gap: 30px;
    padding-bottom: 30px;
}

.content-area {
    display: flex;
    flex-direction: column;
    gap: 30px;
}

.sidebar {
    display: flex;
    flex-direction: column;
    gap: 25px;
}

.service-card {
    background: var(--card-bg);
    border-radius: 20px;
    padding: 30px;
    border: 1px solid rgba(255,255,255,0.05);
    transition: transform 0.3s, box-shadow 0.3s, border-color 0.3s;
    position: relative;
    overflow: hidden;
}

.service-card::before {
    content: '';
    position: absolute;
    top: 0; left: 0; right: 0;
    height: 3px;
    background: linear-gradient(90deg, var(--primary), var(--secondary));
    opacity: 0;
    transition: opacity 0.3s;
}

.service-card:hover {
    transform: translateY(-5px);
    box-shadow: 0 20px 40px rgba(0,0,0,0.3);
    border-color: rgba(0, 210, 255, 0.3);
}

.service-card:hover::before { opacity: 1; }

.card-header {
    display: flex;
    align-items: center;
    gap: 15px;
    margin-bottom: 25px;
}

.card-icon {
    width: 45px;
    height: 45px;
    background: linear-gradient(135deg, rgba(0, 210, 255, 0.1), rgba(123, 44, 191, 0.1));
    border-radius: 12px;
    display: flex;
    align-items: center;
    justify-content: center;
    color: var(--primary);
    flex-shrink: 0;
}

.card-title { font-size: 1.4rem; font-weight: 700; }

/* Price Cards */
.price-grid {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 20px;
    margin-bottom: 30px;
    width: 100%;
}

.price-card {
    background: linear-gradient(135deg, rgba(0, 210, 255, 0.08), rgba(123, 44, 191, 0.08));
    border: 2px solid rgba(0, 210, 255, 0.3);
    border-radius: 16px;
    padding: 20px 15px;
    text-align: center;
    transition: 0.3s;
    display: flex;
    flex-direction: column;
    justify-content: center;
    align-items: center;
}

.price-card:hover {
    transform: scale(1.03);
    border-color: var(--primary);
    box-shadow: 0 0 30px rgba(0, 210, 255, 0.2);
}

.price-amount { font-size: 1.6rem; font-weight: 800; color: var(--text-main); margin-bottom: 4px; }
.price-energy { font-size: 0.95rem; color: var(--primary); font-weight: 600; margin-bottom: 8px; }
.price-validity { font-size: 0.75rem; color: var(--text-muted); background: rgba(0,0,0,0.2); padding: 3px 8px; border-radius: 20px; }

.info-highlight {
    background: rgba(0, 210, 255, 0.05);
    border: 1px solid rgba(0, 210, 255, 0.2);
    padding: 20px;
    border-radius: 12px;
    margin-bottom: 25px;
    color: var(--text-main);
    line-height: 1.7;
    font-weight: 500;
    text-align: center;
}

.info-highlight.usdt {
    background: rgba(38, 161, 123, 0.05);
    border-color: rgba(38, 161, 123, 0.2);
}

.address-box {
    background: rgba(0,0,0,0.3);
    border: 2px dashed rgba(255,255,255,0.2);
    border-radius: 12px;
    padding: 20px;
    text-align: center;
    margin: 20px 0;
    transition: 0.3s;
    cursor: pointer;
}

.address-box:hover {
    border-color: var(--primary);
    background: rgba(0, 210, 255, 0.05);
}

.address-label { display: block; color: var(--text-muted); font-size: 0.85rem; margin-bottom: 10px; }

.address-text {
    font-family: monospace;
    font-size: 1.2rem;
    color: var(--primary);
    word-break: break-all;
    padding: 10px;
    background: rgba(0,0,0,0.2);
    border-radius: 8px;
    display: block;
    margin-bottom: 10px;
    font-weight: 700;
}

.copy-hint {
    font-size: 0.8rem;
    color: var(--text-muted);
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 5px;
}

.info-box {
    background: rgba(255,255,255,0.03);
    padding: 18px;
    border-radius: 12px;
    margin-top: 25px;
    font-size: 0.9rem;
    color: var(--text-muted);
    border-left: 2px solid var(--warning);
    line-height: 1.7;
}

.address-validity { margin: -8px 0 22px; color: var(--text-muted); text-align: center; font-size: 0.9rem; }
.important-note { color: var(--text-main); border-left-color: var(--warning); }
.important-note strong { color: var(--warning); }
.energy-explanation { margin-top: 25px; padding: 22px; background: rgba(255,255,255,0.03); border: 1px solid rgba(255,255,255,0.06); border-radius: 12px; }
.energy-explanation h3 { color: var(--text-main); font-size: 1rem; margin: 18px 0 6px; }
.energy-explanation h3:first-child { margin-top: 0; }
.energy-explanation p { color: var(--text-muted); font-size: 0.92rem; line-height: 1.7; }
.exchange-details { margin-bottom: 25px; overflow: hidden; border: 1px solid rgba(38,161,123,0.22); border-radius: 12px; background: rgba(38,161,123,0.04); }
.exchange-detail { display: flex; justify-content: space-between; gap: 18px; padding: 12px 16px; color: var(--text-muted); font-size: 0.92rem; }
.exchange-detail + .exchange-detail { border-top: 1px solid rgba(38,161,123,0.14); }
.exchange-detail strong { color: var(--success); text-align: right; }
.sidebar-title { margin-bottom: 15px; font-size: 1.15rem; }
.sidebar-description { margin: -5px 0 15px; color: var(--text-muted); font-size: 0.82rem; line-height: 1.6; }
.page-qr { display: block; width: min(190px, 100%); aspect-ratio: 1; margin: 0 auto 14px; padding: 8px; background: #fff; border-radius: 10px; }
.page-qr svg { display: block; width: 100%; height: 100%; }
.page-url { display: block; color: var(--primary); text-align: center; font-size: 0.82rem; line-height: 1.5; word-break: break-all; }
.qr-reminder { margin-top: 10px; color: var(--text-muted); text-align: center; font-size: 0.82rem; line-height: 1.6; }
.support-email { color: var(--primary); font-weight: 600; word-break: break-all; }
.transaction-list { display: grid; gap: 8px; }
.transaction-item { display: flex; justify-content: space-between; gap: 10px; padding: 10px; background: rgba(255,255,255,0.03); border-radius: 8px; font-size: 0.8rem; }
.transaction-address { color: var(--text-muted); font-family: monospace; }
.transaction-amount { color: var(--success); font-weight: 700; white-space: nowrap; }
.transaction-time { display: block; color: var(--text-muted); font-size: 0.72rem; text-align: right; }
.transaction-state { padding: 15px 0; color: var(--text-muted); text-align: center; font-size: 0.85rem; }
.transaction-meta { display: flex; flex-direction: column; gap: 3px; margin-top: 12px; color: var(--text-muted); font-size: 0.72rem; }

/* Features Section */
.features { padding: 80px 0; background: rgba(0,0,0,0.2); }

.section-title {
    text-align: center;
    font-size: 2.2rem;
    margin-bottom: 15px;
    background: linear-gradient(to right, var(--text-main), var(--primary));
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
}

.section-subtitle {
    text-align: center;
    color: var(--text-muted);
    font-size: 1.1rem;
    margin-bottom: 50px;
    max-width: 600px;
    margin-left: auto;
    margin-right: auto;
}

.feature-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 25px;
}

.feature-item {
    background: var(--card-bg);
    padding: 30px 25px;
    border-radius: 20px;
    text-align: center;
    border: 1px solid rgba(255,255,255,0.05);
    transition: 0.3s;
}

.feature-item:hover {
    transform: translateY(-8px);
    border-color: rgba(0, 210, 255, 0.3);
    box-shadow: 0 15px 35px rgba(0,0,0,0.2);
}

.feature-icon-lg { font-size: 3rem; margin-bottom: 20px; display: block; }
.feature-item h3 { font-size: 1.3rem; margin-bottom: 12px; color: var(--text-main); }
.feature-item p { color: var(--text-muted); line-height: 1.7; font-size: 0.95rem; }

/* SEO Content */
.seo-content { padding: 60px 0; background: var(--dark-bg); }
.seo-grid { display: grid; grid-template-columns: repeat(2, 1fr); gap: 30px; }

.seo-article {
    background: var(--card-bg);
    padding: 30px;
    border-radius: 20px;
    border: 1px solid rgba(255,255,255,0.05);
}

.seo-article h3 { font-size: 1.3rem; margin-bottom: 15px; color: var(--primary); }
.seo-article p { color: var(--text-muted); line-height: 1.7; margin-bottom: 12px; font-size: 0.95rem; }

/* FAQ Section */
.faq { padding: 80px 0; background: rgba(0,0,0,0.2); }

.faq-item {
    background: var(--card-bg);
    margin-bottom: 15px;
    border-radius: 12px;
    overflow: hidden;
    border: 1px solid rgba(255,255,255,0.05);
    transition: 0.3s;
}

.faq-item:hover { border-color: rgba(0, 210, 255, 0.2); }

.faq-question {
    padding: 30px;
    cursor: pointer;
    font-weight: 600;
    font-size: 1rem;
    display: flex;
    justify-content: space-between;
    align-items: center;
    color: var(--text-main);
    transition: 0.3s;
}

.faq-question:hover { background: rgba(255,255,255,0.02); }

.faq-question::after {
    content: '+';
    font-size: 1.4rem;
    color: var(--primary);
    transition: 0.3s;
}

.faq-item.active .faq-question::after { content: '−'; }
.faq-item.active .faq-question { color: var(--primary); }

.faq-answer {
    padding: 0 20px 20px;
    color: var(--text-muted);
    display: none;
    border-top: 1px solid rgba(255,255,255,0.05);
    padding-top: 15px;
    line-height: 1.7;
    font-size: 0.95rem;
}

.faq-item.active .faq-answer { display: block; }

/* Footer */
footer {
    background: #0b1120;
    padding: 60px 0 25px;
    border-top: 1px solid rgba(255,255,255,0.05);
}

.footer-grid {
    display: grid;
    grid-template-columns: 2fr 1fr;
    gap: 40px;
    margin-bottom: 50px;
}

.footer-col h4 {
    color: var(--text-main);
    margin-bottom: 20px;
    font-size: 1.1rem;
    position: relative;
    padding-bottom: 8px;
    display: inline-block;
}

.footer-col h4::after {
    content: '';
    position: absolute;
    bottom: 0; left: 0;
    width: 30px; height: 2px;
    background: var(--primary);
}

.footer-col ul li { margin-bottom: 10px; }
.footer-col ul li a { color: var(--text-muted); font-size: 0.9rem; }
.footer-col ul li a:hover { color: var(--primary); }

.footer-about p { color: var(--text-muted); line-height: 1.7; margin-bottom: 15px; font-size: 0.9rem; }

.contact-label { display: block; font-size: 0.85rem; color: var(--text-muted); margin-bottom: 5px; }
.contact-value { font-size: 1rem; color: var(--primary); font-weight: 600; }
.contact-value:hover { color: var(--text-main); text-decoration: underline; }

.copyright {
    text-align: center;
    color: var(--text-muted);
    padding-top: 25px;
    border-top: 1px solid rgba(255,255,255,0.05);
    font-size: 0.85rem;
}

/* Responsive */
@media (max-width: 1024px) {
    .feature-grid, .seo-grid { grid-template-columns: repeat(2, 1fr); }
    .main-layout { grid-template-columns: 1fr; }
    .sidebar { order: 2; }
    .fooxx { display: none; }
}

@media (max-width: 768px) {
    .hero h1 { font-size: 2rem; }
    .nav-links { display: none; }
    .stats-bar { grid-template-columns: 1fr 1fr; gap: 15px; }
    .section-title { font-size: 1.8rem; }
    .hero-buttons { flex-direction: column; width: 100%; padding: 0 3rem; }
    .btn-hero { width: 100%; }
    .price-grid { grid-template-columns: 1fr; }
    .container { padding: 0 15px; }
    .service-card { padding: 1rem; }
    .feature-grid, .seo-grid, .footer-grid { grid-template-columns: 1fr; }
    .hero p { font-size: 0.92rem; }
    .footer-col h4::after { left: 50%; transform: translateX(-50%); }
    .footer-about p { max-width: 100%; margin-left: auto; margin-right: auto; }
    .address-text { font-size: 1.1rem; }
    .seo-article { padding: 1rem; }
    .feature-item, .faq-question { padding: 1rem; }
    .lang-list { right: 1rem; }
}