/* ===== CSS Variables ===== */
:root {
    --primary: #4F46E5;
    --primary-dark: #4338CA;
    --primary-light: #6366F1;
    --secondary: #10B981;
    --secondary-dark: #059669;
    --accent: #F59E0B;
    --danger: #EF4444;
    
    --bg-primary: #0F172A;
    --bg-secondary: #1E293B;
    --bg-card: #334155;
    --bg-input: #1E293B;
    
    --text-primary: #F8FAFC;
    --text-secondary: #CBD5E1;
    --text-muted: #94A3B8;
    
    --border: #475569;
    --border-light: #64748B;
    
    --shadow: 0 4px 6px -1px rgba(0, 0, 0, 0.3), 0 2px 4px -2px rgba(0, 0, 0, 0.3);
    --shadow-lg: 0 10px 15px -3px rgba(0, 0, 0, 0.4), 0 4px 6px -4px rgba(0, 0, 0, 0.4);
    --shadow-xl: 0 20px 25px -5px rgba(0, 0, 0, 0.5), 0 8px 10px -6px rgba(0, 0, 0, 0.5);
    
    --radius: 12px;
    --radius-lg: 16px;
    
    --transition: all 0.2s ease-in-out;
}

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

html {
    scroll-behavior: smooth;
}

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

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

a {
    color: var(--primary-light);
    text-decoration: none;
    transition: var(--transition);
}

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

/* ===== Buttons ===== */
.btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    padding: 10px 24px;
    border: none;
    border-radius: var(--radius);
    font-size: 14px;
    font-weight: 500;
    cursor: pointer;
    transition: var(--transition);
    text-decoration: none;
}

.btn-primary {
    background: linear-gradient(135deg, var(--primary), var(--primary-dark));
    color: white;
}

.btn-primary:hover {
    background: linear-gradient(135deg, var(--primary-light), var(--primary));
    transform: translateY(-2px);
    box-shadow: var(--shadow);
}

.btn-secondary {
    background: var(--bg-card);
    color: var(--text-primary);
    border: 1px solid var(--border);
}

.btn-secondary:hover {
    background: var(--border);
}

.btn-success {
    background: linear-gradient(135deg, var(--secondary), var(--secondary-dark));
    color: white;
}

.btn-lg {
    padding: 14px 32px;
    font-size: 16px;
}

.btn-block {
    width: 100%;
}

.btn:disabled {
    opacity: 0.6;
    cursor: not-allowed;
    transform: none;
}

/* ===== Navbar ===== */
.navbar {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    background: rgba(15, 23, 42, 0.9);
    backdrop-filter: blur(12px);
    z-index: 1000;
    border-bottom: 1px solid rgba(71, 85, 105, 0.3);
}

.navbar .container {
    display: flex;
    align-items: center;
    justify-content: space-between;
    height: 70px;
}

.navbar-brand {
    display: flex;
    align-items: center;
    gap: 10px;
}

.logo-icon {
    width: 32px;
    height: 32px;
    color: var(--primary-light);
}

.brand-name {
    font-size: 20px;
    font-weight: 700;
    background: linear-gradient(135deg, var(--primary-light), var(--secondary));
    -webkit-background-clip: text;
    background-clip: text;
    -webkit-text-fill-color: transparent;
}

.navbar-menu {
    display: flex;
    gap: 24px;
}

.nav-link {
    color: var(--text-secondary);
    font-weight: 500;
    transition: var(--transition);
}

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

.navbar-actions {
    display: flex;
    align-items: center;
    gap: 12px;
}

.lang-btn {
    background: var(--bg-card);
    color: var(--text-secondary);
    border: 1px solid var(--border);
    padding: 6px 12px;
    border-radius: var(--radius);
    cursor: pointer;
    font-size: 13px;
    transition: var(--transition);
}

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

.mobile-menu-btn {
    display: none;
    background: none;
    border: none;
    color: var(--text-primary);
    font-size: 24px;
    cursor: pointer;
}

/* ===== Hero Section ===== */
.hero {
    padding: 160px 0 80px;
    text-align: center;
    background: radial-gradient(ellipse at top, rgba(79, 70, 229, 0.15) 0%, transparent 60%);
}

.hero-title {
    font-size: 3rem;
    font-weight: 700;
    margin-bottom: 16px;
    background: linear-gradient(135deg, var(--text-primary), var(--text-secondary));
    -webkit-background-clip: text;
    background-clip: text;
    -webkit-text-fill-color: transparent;
}

.hero-subtitle {
    font-size: 1.25rem;
    color: var(--text-secondary);
    margin-bottom: 32px;
    max-width: 600px;
    margin-left: auto;
    margin-right: auto;
}

.hero-features {
    display: flex;
    justify-content: center;
    gap: 40px;
    margin-top: 60px;
    flex-wrap: wrap;
}

.feature-item {
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 8px;
}

.feature-icon {
    font-size: 2.5rem;
}

.feature-text {
    color: var(--text-secondary);
    font-size: 14px;
}

/* ===== Section ===== */
.section-title {
    font-size: 2.25rem;
    font-weight: 700;
    text-align: center;
    margin-bottom: 12px;
}

.section-subtitle {
    text-align: center;
    color: var(--text-secondary);
    font-size: 1.1rem;
    margin-bottom: 48px;
}

.plans-section {
    padding: 80px 0;
}

.check-section,
.manage-section {
    padding: 60px 0;
    background: var(--bg-secondary);
}

.help-section {
    padding: 80px 0;
}

/* ===== Plans Grid ===== */
.plans-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
    gap: 24px;
    margin-top: 40px;
}

.plan-card {
    background: var(--bg-secondary);
    border: 1px solid var(--border);
    border-radius: var(--radius-lg);
    padding: 32px;
    display: flex;
    flex-direction: column;
    transition: var(--transition);
    position: relative;
    overflow: hidden;
}

.plan-card:hover {
    transform: translateY(-4px);
    box-shadow: var(--shadow-lg);
    border-color: var(--primary);
}

.plan-card.popular {
    border-color: var(--accent);
    box-shadow: 0 0 30px rgba(245, 158, 11, 0.15);
}

.popular-badge {
    position: absolute;
    top: 16px;
    right: -28px;
    background: var(--accent);
    color: #1a1a1a;
    padding: 4px 36px;
    font-size: 12px;
    font-weight: 600;
    transform: rotate(45deg);
}

.plan-icon {
    font-size: 3rem;
    margin-bottom: 16px;
}

.plan-name {
    font-size: 1.5rem;
    font-weight: 600;
    margin-bottom: 8px;
}

.plan-description {
    color: var(--text-secondary);
    font-size: 14px;
    margin-bottom: 16px;
}

.plan-price {
    font-size: 2.5rem;
    font-weight: 700;
    margin-bottom: 4px;
    color: var(--primary-light);
}

.plan-price-period {
    color: var(--text-muted);
    font-size: 14px;
    margin-bottom: 20px;
}

.plan-traffic {
    display: flex;
    align-items: center;
    gap: 8px;
    padding: 8px 0;
    border-top: 1px solid var(--border);
}

.plan-traffic-icon,
.plan-devices-icon,
.plan-duration-icon {
    font-size: 18px;
}

.plan-devices,
.plan-duration {
    display: flex;
    align-items: center;
    gap: 8px;
    padding: 8px 0;
}

.plan-traffic-label,
.plan-devices-label,
.plan-duration-label {
    color: var(--text-muted);
    font-size: 13px;
}

.plan-traffic-value,
.plan-devices-value,
.plan-duration-value {
    color: var(--text-primary);
    font-weight: 500;
    margin-left: auto;
}

.plan-features {
    margin: 20px 0;
    display: flex;
    flex-direction: column;
    gap: 8px;
}

.plan-feature {
    display: flex;
    align-items: center;
    gap: 8px;
    color: var(--text-secondary);
    font-size: 14px;
}

.plan-feature-icon {
    color: var(--secondary);
}

/* ===== Check & Manage Forms ===== */
.check-card,
.manage-card {
    background: var(--bg-primary);
    border: 1px solid var(--border);
    border-radius: var(--radius-lg);
    padding: 40px;
    max-width: 500px;
    margin: 0 auto;
}

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

.form-group label {
    display: block;
    margin-bottom: 8px;
    color: var(--text-secondary);
    font-size: 14px;
    font-weight: 500;
}

.form-group input,
.form-group select,
.form-group textarea {
    width: 100%;
    padding: 12px 16px;
    background: var(--bg-input);
    border: 1px solid var(--border);
    border-radius: var(--radius);
    color: var(--text-primary);
    font-size: 14px;
    transition: var(--transition);
}

.form-group input:focus,
.form-group select:focus,
.form-group textarea:focus {
    outline: none;
    border-color: var(--primary);
    box-shadow: 0 0 0 3px rgba(79, 70, 229, 0.2);
}

.form-group input::placeholder {
    color: var(--text-muted);
}

.check-form,
.manage-form {
    display: flex;
    flex-direction: column;
}

.check-result,
.manage-result {
    margin-top: 24px;
    padding: 20px;
    background: var(--bg-secondary);
    border-radius: var(--radius);
    border: 1px solid var(--border);
}

/* ===== FAQ ===== */
.faq-list {
    max-width: 800px;
    margin: 0 auto 60px;
    display: flex;
    flex-direction: column;
    gap: 12px;
}

.faq-item {
    background: var(--bg-secondary);
    border: 1px solid var(--border);
    border-radius: var(--radius);
    overflow: hidden;
}

.faq-question {
    width: 100%;
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 20px;
    background: none;
    border: none;
    color: var(--text-primary);
    font-size: 16px;
    font-weight: 500;
    cursor: pointer;
    text-align: left;
    transition: var(--transition);
}

.faq-question:hover {
    background: rgba(79, 70, 229, 0.05);
}

.faq-toggle {
    font-size: 24px;
    color: var(--primary-light);
    transition: var(--transition);
}

.faq-question.active .faq-toggle {
    transform: rotate(45deg);
}

.faq-answer {
    max-height: 0;
    overflow: hidden;
    transition: max-height 0.3s ease;
    padding: 0 20px;
    color: var(--text-secondary);
    line-height: 1.7;
}

.faq-answer.show {
    max-height: 300px;
    padding: 0 20px 20px;
}

.support-card {
    background: var(--bg-secondary);
    border: 1px solid var(--border);
    border-radius: var(--radius-lg);
    padding: 40px;
    max-width: 600px;
    margin: 0 auto;
    text-align: center;
}

.support-card h3 {
    font-size: 1.5rem;
    margin-bottom: 12px;
}

.support-card p {
    color: var(--text-secondary);
    margin-bottom: 16px;
}

.support-email {
    font-size: 18px;
    font-weight: 500;
    color: var(--primary-light);
}

/* ===== Modal ===== */
.modal {
    display: none;
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: rgba(0, 0, 0, 0.7);
    z-index: 2000;
    padding: 20px;
    align-items: center;
    justify-content: center;
}

.modal.show {
    display: flex;
}

.modal-content {
    background: var(--bg-secondary);
    border: 1px solid var(--border);
    border-radius: var(--radius-lg);
    max-width: 500px;
    width: 100%;
    max-height: 90vh;
    overflow-y: auto;
    box-shadow: var(--shadow-xl);
}

.modal-lg {
    max-width: 800px;
}

.modal-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 24px;
    border-bottom: 1px solid var(--border);
}

.modal-header h3 {
    font-size: 1.25rem;
}

.modal-close {
    background: none;
    border: none;
    color: var(--text-secondary);
    font-size: 28px;
    cursor: pointer;
    padding: 0;
    line-height: 1;
    transition: var(--transition);
}

.modal-close:hover {
    color: var(--text-primary);
}

.modal-body {
    padding: 24px;
}

.payment-plan-info {
    background: var(--bg-card);
    border-radius: var(--radius);
    padding: 20px;
    margin-bottom: 20px;
}

.payment-plan-name {
    font-size: 1.25rem;
    font-weight: 600;
    margin-bottom: 8px;
}

.payment-plan-price {
    font-size: 1.5rem;
    font-weight: 700;
    color: var(--primary-light);
}

/* ===== Dashboard ===== */
.dashboard-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 24px;
    padding-bottom: 16px;
    border-bottom: 1px solid var(--border);
}

.dashboard-status {
    display: inline-block;
    padding: 6px 16px;
    border-radius: 20px;
    font-size: 14px;
    font-weight: 500;
}

.status-active {
    background: rgba(16, 185, 129, 0.2);
    color: var(--secondary);
}

.status-expired {
    background: rgba(239, 68, 68, 0.2);
    color: var(--danger);
}

.status-limited {
    background: rgba(245, 158, 11, 0.2);
    color: var(--accent);
}

.dashboard-stats {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
    gap: 16px;
    margin-bottom: 24px;
}

.dashboard-stat {
    background: var(--bg-card);
    border-radius: var(--radius);
    padding: 20px;
}

.dashboard-stat-label {
    color: var(--text-muted);
    font-size: 13px;
    margin-bottom: 4px;
}

.dashboard-stat-value {
    font-size: 1.25rem;
    font-weight: 600;
}

.dashboard-actions {
    display: flex;
    gap: 12px;
    flex-wrap: wrap;
}

/* ===== Loading ===== */
.loading-skeleton {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
    gap: 24px;
}

.skeleton-card {
    background: var(--bg-secondary);
    border-radius: var(--radius-lg);
    height: 350px;
    animation: pulse 2s infinite;
}

@keyframes pulse {
    0%, 100% { opacity: 1; }
    50% { opacity: 0.5; }
}

.spinner {
    display: inline-block;
    width: 20px;
    height: 20px;
    border: 2px solid rgba(255, 255, 255, 0.3);
    border-top-color: white;
    border-radius: 50%;
    animation: spin 1s linear infinite;
}

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

/* ===== Toast ===== */
.toast {
    position: fixed;
    bottom: 20px;
    right: 20px;
    background: var(--bg-secondary);
    border: 1px solid var(--border);
    border-radius: var(--radius);
    padding: 16px 24px;
    z-index: 3000;
    box-shadow: var(--shadow-lg);
    display: flex;
    align-items: center;
    gap: 12px;
    animation: slideIn 0.3s ease;
}

.toast-success {
    border-color: var(--secondary);
    background: rgba(16, 185, 129, 0.1);
}

.toast-error {
    border-color: var(--danger);
    background: rgba(239, 68, 68, 0.1);
}

.toast-warning {
    border-color: var(--accent);
    background: rgba(245, 158, 11, 0.1);
}

@keyframes slideIn {
    from {
        transform: translateX(100px);
        opacity: 0;
    }
    to {
        transform: translateX(0);
        opacity: 1;
    }
}

/* ===== Footer ===== */
.footer {
    background: var(--bg-secondary);
    border-top: 1px solid var(--border);
    padding: 40px 0 20px;
}

.footer-content {
    display: flex;
    justify-content: space-between;
    align-items: center;
    flex-wrap: wrap;
    gap: 20px;
}

.footer-brand span {
    font-size: 20px;
    font-weight: 700;
    background: linear-gradient(135deg, var(--primary-light), var(--secondary));
    -webkit-background-clip: text;
    background-clip: text;
    -webkit-text-fill-color: transparent;
}

.footer-brand p {
    color: var(--text-muted);
    font-size: 14px;
    margin-top: 4px;
}

.footer-links {
    display: flex;
    gap: 24px;
}

.footer-links a {
    color: var(--text-secondary);
}

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

.footer-bottom {
    text-align: center;
    margin-top: 30px;
    padding-top: 20px;
    border-top: 1px solid var(--border);
    color: var(--text-muted);
    font-size: 13px;
}

/* ===== Responsive ===== */
@media (max-width: 768px) {
    .navbar-menu {
        display: none;
        position: absolute;
        top: 70px;
        left: 0;
        right: 0;
        background: var(--bg-secondary);
        flex-direction: column;
        padding: 20px;
        gap: 16px;
        border-bottom: 1px solid var(--border);
    }

    .navbar-menu.show {
        display: flex;
    }

    .mobile-menu-btn {
        display: block;
    }

    .hero {
        padding: 120px 0 60px;
    }

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

    .hero-subtitle {
        font-size: 1rem;
    }

    .hero-features {
        gap: 20px;
    }

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

    .section-title {
        font-size: 1.75rem;
    }

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

    .plan-card {
        padding: 24px;
    }

    .check-card,
    .manage-card {
        padding: 24px;
    }

    .modal-content {
        margin: 10px;
    }

    .footer-content {
        flex-direction: column;
        text-align: center;
    }

    .footer-links {
        justify-content: center;
    }

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

/* ===== Animations ===== */
.fade-in {
    animation: fadeIn 0.3s ease forwards;
}

@keyframes fadeIn {
    from {
        opacity: 0;
        transform: translateY(20px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

.slide-up {
    animation: slideUp 0.4s ease forwards;
}

@keyframes slideUp {
    from {
        opacity: 0;
        transform: translateY(40px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

/* ===== Payment Page ===== */
.payment-methods {
    display: flex;
    flex-direction: column;
    gap: 12px;
    margin: 20px 0;
}

.payment-method {
    display: flex;
    align-items: center;
    gap: 12px;
    padding: 16px;
    background: var(--bg-card);
    border: 2px solid var(--border);
    border-radius: var(--radius);
    cursor: pointer;
    transition: var(--transition);
}

.payment-method:hover {
    border-color: var(--primary);
}

.payment-method.selected {
    border-color: var(--primary);
    background: rgba(79, 70, 229, 0.1);
}

.payment-method-icon {
    font-size: 28px;
}

.payment-method-name {
    font-weight: 500;
}

.payment-method-desc {
    font-size: 13px;
    color: var(--text-muted);
}