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

:root {
    --primary: #00d4ff;
    --primary-dark: #7b2ff7;
    --bg-dark: #0a0a1a;
    --bg-card: #12122a;
    --text: #ffffff;
    --text-muted: #888888;
}

body {
    font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', 'PingFang SC', 'Hiragino Sans GB', 'Microsoft YaHei', sans-serif;
    background: linear-gradient(135deg, var(--bg-dark) 0%, #0f0f2e 100%);
    color: var(--text);
    line-height: 1.6;
}

.container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 20px;
}

/* Header */
.header {
    padding: 20px 0;
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    background: rgba(10, 10, 26, 0.9);
    backdrop-filter: blur(10px);
    z-index: 100;
}

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

.logo {
    font-size: 28px;
    font-weight: bold;
    background: linear-gradient(90deg, var(--primary), var(--primary-dark));
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
}

.nav {
    display: flex;
    gap: 30px;
}

.nav a {
    color: var(--text);
    text-decoration: none;
    transition: color 0.3s;
}

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

/* Hero */
.hero {
    padding: 150px 0 80px;
    text-align: center;
}

.hero h1 {
    font-size: 56px;
    margin-bottom: 20px;
}

.hero h1 span {
    background: linear-gradient(90deg, var(--primary), var(--primary-dark));
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
}

.hero p {
    font-size: 20px;
    color: var(--text-muted);
    margin-bottom: 40px;
}

.hero-buttons {
    display: flex;
    gap: 20px;
    justify-content: center;
}

/* Buttons */
.btn {
    display: inline-block;
    padding: 14px 36px;
    border-radius: 30px;
    text-decoration: none;
    font-size: 16px;
    font-weight: bold;
    transition: all 0.3s;
    cursor: pointer;
    border: none;
}

.btn-primary {
    background: linear-gradient(90deg, var(--primary), var(--primary-dark));
    color: white;
}

.btn-primary:hover {
    transform: translateY(-2px);
    box-shadow: 0 10px 30px rgba(0, 212, 255, 0.3);
}

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

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

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

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

/* Packages */
.packages-preview, .packages-full {
    padding: 80px 0;
}

.packages-preview h2, .packages-full h2 {
    text-align: center;
    font-size: 36px;
    margin-bottom: 40px;
}

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

.package-card {
    background: var(--bg-card);
    border: 1px solid rgba(255, 255, 255, 0.1);
    border-radius: 20px;
    padding: 40px;
    text-align: center;
    transition: all 0.3s;
}

.package-card:hover {
    transform: translateY(-10px);
    border-color: var(--primary);
    box-shadow: 0 20px 40px rgba(0, 212, 255, 0.15);
}

.package-card.featured {
    background: linear-gradient(135deg, rgba(0, 212, 255, 0.1), rgba(123, 47, 247, 0.1));
    border-color: var(--primary);
}

.package-card h3 {
    font-size: 24px;
    margin-bottom: 10px;
}

.package-card .price {
    font-size: 48px;
    font-weight: bold;
    color: var(--primary);
    margin: 20px 0;
}

.package-card .price span {
    font-size: 16px;
    color: var(--text-muted);
}

.package-card .traffic {
    font-size: 24px;
    color: var(--primary);
    margin-bottom: 15px;
}

.package-card p {
    color: var(--text-muted);
    margin-bottom: 20px;
}

/* Billing cycle */
.billing-cycle {
    display: flex;
    justify-content: center;
    gap: 15px;
    margin-bottom: 30px;
}

.billing-option {
    padding: 10px 20px;
    border: 1px solid rgba(255, 255, 255, 0.2);
    border-radius: 20px;
    cursor: pointer;
    transition: all 0.3s;
}

.billing-option.active {
    border-color: var(--primary);
    background: rgba(0, 212, 255, 0.1);
}

.billing-option .discount {
    color: var(--primary);
    font-size: 12px;
}

/* Features */
.features {
    padding: 80px 0;
    background: var(--bg-card);
}

.features h2 {
    text-align: center;
    font-size: 36px;
    margin-bottom: 40px;
}

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

.feature {
    text-align: center;
    padding: 30px;
}

.feature-icon {
    font-size: 48px;
    margin-bottom: 15px;
}

.feature h3 {
    margin-bottom: 10px;
}

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

/* Articles */
.articles-preview, .articles-full {
    padding: 80px 0;
}

.articles-preview h2, .articles-full h2 {
    text-align: center;
    font-size: 36px;
    margin-bottom: 40px;
}

.articles-list {
    display: grid;
    gap: 20px;
}

.article-item {
    display: block;
    background: var(--bg-card);
    border: 1px solid rgba(255, 255, 255, 0.1);
    border-radius: 10px;
    padding: 20px;
    text-decoration: none;
    color: var(--text);
    transition: all 0.3s;
}

.article-item:hover {
    border-color: var(--primary);
    transform: translateX(10px);
}

.article-item h3 {
    margin-bottom: 10px;
}

.article-item p {
    color: var(--text-muted);
    font-size: 14px;
}

/* User Center */
.user-center {
    padding: 100px 0 40px;
}

.user-center .container {
    max-width: 1000px;
}

.user-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 40px;
}

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

.info-card {
    background: var(--bg-card);
    border: 1px solid rgba(255, 255, 255, 0.1);
    border-radius: 15px;
    padding: 25px;
    text-align: center;
}

.info-card .label {
    color: var(--text-muted);
    font-size: 14px;
    margin-bottom: 10px;
}

.info-card .value {
    font-size: 28px;
    font-weight: bold;
    color: var(--primary);
}

/* Tabs */
.tabs {
    display: flex;
    gap: 10px;
    margin-bottom: 30px;
}

.tab {
    padding: 12px 24px;
    background: var(--bg-card);
    border: 1px solid rgba(255, 255, 255, 0.1);
    border-radius: 10px;
    cursor: pointer;
    transition: all 0.3s;
}

.tab.active {
    border-color: var(--primary);
    background: rgba(0, 212, 255, 0.1);
}

/* Forms */
.form-group {
    margin-bottom: 20px;
}

.form-group label {
    display: block;
    margin-bottom: 8px;
    color: var(--text-muted);
}

.form-group input, .form-group select {
    width: 100%;
    padding: 14px;
    background: var(--bg-card);
    border: 1px solid rgba(255, 255, 255, 0.1);
    border-radius: 10px;
    color: var(--text);
    font-size: 16px;
}

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

/* Wallet */
.wallet-balance {
    background: var(--bg-card);
    border: 1px solid rgba(255, 255, 255, 0.1);
    border-radius: 15px;
    padding: 30px;
    text-align: center;
    margin-bottom: 30px;
}

.wallet-balance .amount {
    font-size: 48px;
    font-weight: bold;
    color: var(--primary);
}

.recharge-options {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(150px, 1fr));
    gap: 15px;
    margin-bottom: 20px;
}

.recharge-option {
    padding: 20px;
    background: var(--bg-card);
    border: 1px solid rgba(255, 255, 255, 0.1);
    border-radius: 10px;
    text-align: center;
    cursor: pointer;
    transition: all 0.3s;
}

.recharge-option:hover, .recharge-option.active {
    border-color: var(--primary);
    background: rgba(0, 212, 255, 0.1);
}

.recharge-option .amount {
    font-size: 24px;
    font-weight: bold;
}

.recharge-option .beans {
    color: var(--primary);
    font-size: 14px;
}

/* Agent */
.agent-stats {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
    gap: 20px;
    margin-bottom: 30px;
}

.referral-link {
    display: flex;
    gap: 10px;
    margin-bottom: 30px;
}

.referral-link input {
    flex: 1;
    padding: 14px;
    background: var(--bg-card);
    border: 1px solid rgba(255, 255, 255, 0.1);
    border-radius: 10px;
    color: var(--text);
}

/* Footer */
.footer {
    padding: 40px 0;
    text-align: center;
    color: var(--text-muted);
    border-top: 1px solid rgba(255, 255, 255, 0.1);
    margin-top: 80px;
}

/* Modal */
.modal {
    display: none;
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: rgba(0, 0, 0, 0.8);
    z-index: 1000;
    align-items: center;
    justify-content: center;
}

.modal.active {
    display: flex;
}

.modal-content {
    background: var(--bg-card);
    border: 1px solid rgba(255, 255, 255, 0.1);
    border-radius: 20px;
    padding: 40px;
    max-width: 400px;
    width: 90%;
}

.modal-content h2 {
    margin-bottom: 20px;
}

.close-modal {
    position: absolute;
    top: 20px;
    right: 20px;
    font-size: 24px;
    cursor: pointer;
}

/* Responsive */
@media (max-width: 768px) {
    .hero h1 {
        font-size: 36px;
    }
    
    .nav {
        gap: 15px;
    }
    
    .packages-grid {
        grid-template-columns: 1fr;
    }
    
    .features-grid {
        grid-template-columns: 1fr;
    }
}