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

:root {
    --color-bg: #ffffff;
    --color-text: #1a1a1a;
    --color-text-secondary: #666666;
    --color-accent: #2c3e50;
    --color-accent-light: #34495e;
    --color-border: #e0e0e0;
    --color-card-bg: #fafafa;
    --spacing-unit: 8px;
    --max-width: 1200px;
    --radius-sm: 8px;
    --radius-md: 12px;
    --radius-lg: 16px;
    --shadow-sm: 0 2px 8px rgba(0, 0, 0, 0.04);
    --shadow-md: 0 4px 16px rgba(0, 0, 0, 0.08);
    --shadow-lg: 0 8px 32px rgba(0, 0, 0, 0.12);
}

body {
    font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', 'PingFang SC', 'Hiragino Sans GB', 
                 'Microsoft YaHei', sans-serif;
    line-height: 1.6;
    color: var(--color-text);
    background: linear-gradient(135deg, #fafafa 0%, #f5f5f5 50%, #fafafa 100%);
    overflow-x: hidden;
}

.container {
    max-width: var(--max-width);
    margin: 0 auto;
    padding: 0 calc(var(--spacing-unit) * 3);
}

/* Header */
header {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    background: rgba(255, 255, 255, 0.95);
    backdrop-filter: blur(10px);
    border-bottom: 1px solid var(--color-border);
    z-index: 1000;
    transition: all 0.3s ease;
}

nav {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: calc(var(--spacing-unit) * 2.5) calc(var(--spacing-unit) * 3);
    min-height: 70px;
}

.logo {
    display: flex;
    align-items: center;
}

.logo a {
    display: flex;
    align-items: center;
}

.logo img {
    height: 40px;
    width: auto;
    transition: transform 0.3s ease;
}

.logo img:hover {
    transform: scale(1.05);
}

.nav-links {
    display: flex;
    gap: calc(var(--spacing-unit) * 5);
    align-items: center;
}

.nav-links a {
    text-decoration: none;
    color: var(--color-text-secondary);
    font-size: 0.95rem;
    transition: all 0.3s ease;
    padding: calc(var(--spacing-unit) * 1.5) calc(var(--spacing-unit) * 2);
    border-radius: var(--radius-sm);
    position: relative;
}

.nav-links a:hover {
    color: var(--color-text);
    background: rgba(44, 62, 80, 0.05);
}

.nav-links a.active {
    color: var(--color-accent);
}

.nav-purchase {
    background: linear-gradient(135deg, var(--color-accent) 0%, var(--color-accent-light) 100%) !important;
    color: white !important;
    padding: calc(var(--spacing-unit) * 1.5) calc(var(--spacing-unit) * 3) !important;
    border-radius: var(--radius-md) !important;
    font-weight: 500;
    box-shadow: 0 2px 8px rgba(44, 62, 80, 0.2);
}

.nav-purchase:hover {
    background: linear-gradient(135deg, var(--color-accent-light) 0%, var(--color-accent) 100%) !important;
    transform: translateY(-2px);
    box-shadow: 0 4px 12px rgba(44, 62, 80, 0.3);
}

.nav-links {
    display: flex;
    gap: calc(var(--spacing-unit) * 4);
}

.nav-links a {
    text-decoration: none;
    color: var(--color-text-secondary);
    font-size: 0.95rem;
    transition: color 0.3s ease;
}

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

/* Hero Section */
.hero {
    margin-top: 80px;
    padding: calc(var(--spacing-unit) * 20) 0 calc(var(--spacing-unit) * 15);
    position: relative;
}

.hero::before {
    content: '';
    position: absolute;
    top: 0;
    left: 50%;
    transform: translateX(-50%);
    width: 600px;
    height: 600px;
    background: radial-gradient(circle, rgba(44, 62, 80, 0.05) 0%, transparent 70%);
    pointer-events: none;
}

.hero-content {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: calc(var(--spacing-unit) * 8);
    align-items: center;
}

.hero-text {
    text-align: left;
}

.hero h1 {
    font-size: 3.5rem;
    font-weight: 700;
    letter-spacing: -2px;
    margin-bottom: calc(var(--spacing-unit) * 3);
    line-height: 1.1;
    position: relative;
    background: linear-gradient(135deg, #1a1a1a 0%, #2c3e50 100%);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.hero-image {
    position: relative;
    border-radius: var(--radius-lg);
    overflow: hidden;
    box-shadow: var(--shadow-lg);
    transition: all 0.4s ease;
}

.hero-image:hover {
    transform: translateY(-8px);
    box-shadow: 0 12px 48px rgba(0, 0, 0, 0.15);
}

.hero-image img {
    width: 100%;
    height: auto;
    display: block;
    border-radius: var(--radius-lg);
}

.subtitle {
    font-size: 1.25rem;
    color: var(--color-text-secondary);
    margin-bottom: calc(var(--spacing-unit) * 5);
    font-weight: 400;
}

.cta-button {
    display: inline-block;
    padding: calc(var(--spacing-unit) * 2) calc(var(--spacing-unit) * 5);
    background: linear-gradient(135deg, var(--color-accent) 0%, var(--color-accent-light) 100%);
    color: white;
    text-decoration: none;
    border-radius: var(--radius-lg);
    font-size: 1rem;
    font-weight: 500;
    transition: all 0.4s cubic-bezier(0.4, 0, 0.2, 1);
    border: 2px solid transparent;
    box-shadow: 0 4px 16px rgba(44, 62, 80, 0.2);
    position: relative;
    overflow: hidden;
}

.cta-button::before {
    content: '';
    position: absolute;
    top: 0;
    left: -100%;
    width: 100%;
    height: 100%;
    background: linear-gradient(90deg, transparent, rgba(255, 255, 255, 0.2), transparent);
    transition: left 0.6s ease;
}

.cta-button:hover::before {
    left: 100%;
}

.cta-button:hover {
    transform: translateY(-2px);
    box-shadow: 0 6px 24px rgba(44, 62, 80, 0.3);
}

/* Features Section */
.features {
    padding: calc(var(--spacing-unit) * 15) 0;
    background: linear-gradient(180deg, #fafafa 0%, #ffffff 100%);
}

.feature-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: calc(var(--spacing-unit) * 4);
}

.feature-card {
    padding: calc(var(--spacing-unit) * 5);
    background: white;
    border: 1px solid var(--color-border);
    border-radius: var(--radius-lg);
    transition: all 0.4s cubic-bezier(0.4, 0, 0.2, 1);
    box-shadow: var(--shadow-sm);
    position: relative;
    overflow: hidden;
}

.feature-card::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 4px;
    background: linear-gradient(90deg, var(--color-accent) 0%, var(--color-accent-light) 100%);
    transform: scaleX(0);
    transform-origin: left;
    transition: transform 0.4s cubic-bezier(0.4, 0, 0.2, 1);
}

.feature-card:hover::before {
    transform: scaleX(1);
}

.feature-card:hover {
    transform: translateY(-8px);
    box-shadow: var(--shadow-lg);
    border-color: transparent;
}

.feature-icon {
    width: 64px;
    height: 64px;
    display: flex;
    align-items: center;
    justify-content: center;
    background: linear-gradient(135deg, rgba(44, 62, 80, 0.08) 0%, rgba(44, 62, 80, 0.04) 100%);
    border-radius: var(--radius-md);
    color: var(--color-accent);
    margin-bottom: calc(var(--spacing-unit) * 3);
    transition: all 0.4s cubic-bezier(0.4, 0, 0.2, 1);
}

.feature-card:hover .feature-icon {
    transform: scale(1.1) rotate(5deg);
    background: linear-gradient(135deg, rgba(44, 62, 80, 0.12) 0%, rgba(44, 62, 80, 0.08) 100%);
}

.feature-card h3 {
    font-size: 1.5rem;
    font-weight: 600;
    margin-bottom: calc(var(--spacing-unit) * 2);
    letter-spacing: -0.5px;
}

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

/* Pricing Section */
.pricing {
    padding: calc(var(--spacing-unit) * 15) 0;
}

.pricing h2 {
    text-align: center;
    font-size: 2.5rem;
    font-weight: 700;
    margin-bottom: calc(var(--spacing-unit) * 8);
    letter-spacing: -1px;
}

.pricing-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(320px, 1fr));
    gap: calc(var(--spacing-unit) * 4);
    max-width: 900px;
    margin: 0 auto;
}

.pricing-card {
    background: white;
    border: 2px solid var(--color-border);
    border-radius: var(--radius-lg);
    padding: calc(var(--spacing-unit) * 5);
    position: relative;
    transition: all 0.4s cubic-bezier(0.4, 0, 0.2, 1);
    box-shadow: var(--shadow-sm);
    overflow: hidden;
}

.pricing-card::after {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: linear-gradient(135deg, rgba(44, 62, 80, 0.02) 0%, transparent 100%);
    opacity: 0;
    transition: opacity 0.4s ease;
    pointer-events: none;
}

.pricing-card:hover::after {
    opacity: 1;
}

.pricing-card:hover {
    border-color: var(--color-accent);
    transform: translateY(-8px) scale(1.02);
    box-shadow: var(--shadow-lg);
}

.pricing-card.featured {
    border-color: var(--color-accent);
    box-shadow: var(--shadow-md);
    background: linear-gradient(135deg, #ffffff 0%, #fafafa 100%);
}

.pricing-card.featured:hover {
    box-shadow: 0 12px 48px rgba(44, 62, 80, 0.18);
}

.badge {
    position: absolute;
    top: calc(var(--spacing-unit) * 2);
    right: calc(var(--spacing-unit) * 2);
    background: linear-gradient(135deg, var(--color-accent) 0%, var(--color-accent-light) 100%);
    color: white;
    padding: calc(var(--spacing-unit) / 2) calc(var(--spacing-unit) * 2);
    font-size: 0.75rem;
    font-weight: 600;
    letter-spacing: 0.5px;
    border-radius: var(--radius-sm);
    box-shadow: 0 2px 8px rgba(44, 62, 80, 0.2);
}

.plan-header {
    text-align: center;
    padding-bottom: calc(var(--spacing-unit) * 4);
    border-bottom: 1px solid var(--color-border);
    margin-bottom: calc(var(--spacing-unit) * 4);
}

.plan-header h3 {
    font-size: 1.5rem;
    font-weight: 600;
    margin-bottom: calc(var(--spacing-unit) * 3);
    letter-spacing: -0.5px;
}

.price {
    margin-bottom: calc(var(--spacing-unit) * 2);
}

.amount {
    font-size: 3.5rem;
    font-weight: 700;
    letter-spacing: -2px;
    background: linear-gradient(135deg, var(--color-accent) 0%, var(--color-accent-light) 100%);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.currency {
    font-size: 1.25rem;
    color: var(--color-text-secondary);
    margin-left: calc(var(--spacing-unit));
}

.duration {
    color: var(--color-text-secondary);
    font-size: 0.95rem;
}

.features-list {
    list-style: none;
}

.features-list li {
    padding: calc(var(--spacing-unit) * 2) 0;
    color: var(--color-text-secondary);
    position: relative;
    padding-left: calc(var(--spacing-unit) * 4);
}

.features-list li::before {
    content: '✓';
    position: absolute;
    left: 0;
    color: var(--color-accent);
    font-weight: 600;
}

/* Contact Section */
.contact {
    padding: calc(var(--spacing-unit) * 15) 0;
    background: linear-gradient(180deg, #ffffff 0%, #fafafa 100%);
}

.contact h2 {
    text-align: center;
    font-size: 2.5rem;
    font-weight: 700;
    margin-bottom: calc(var(--spacing-unit) * 8);
    letter-spacing: -1px;
}

.contact-content {
    max-width: 700px;
    margin: 0 auto;
}

.payment-info {
    background: white;
    padding: calc(var(--spacing-unit) * 6);
    border: 1px solid var(--color-border);
    border-radius: var(--radius-lg);
    box-shadow: var(--shadow-md);
    transition: all 0.4s ease;
}

.payment-info:hover {
    box-shadow: var(--shadow-lg);
    transform: translateY(-4px);
}

.payment-info h3 {
    font-size: 1.25rem;
    font-weight: 600;
    margin-bottom: calc(var(--spacing-unit) * 3);
    letter-spacing: -0.5px;
}

.address-box {
    display: flex;
    align-items: center;
    gap: calc(var(--spacing-unit) * 2);
    padding: calc(var(--spacing-unit) * 3);
    background: linear-gradient(135deg, #fafafa 0%, #f5f5f5 100%);
    border: 1px solid var(--color-border);
    border-radius: var(--radius-md);
    margin-bottom: calc(var(--spacing-unit) * 4);
    transition: all 0.3s ease;
}

.address-box:hover {
    border-color: var(--color-accent);
    box-shadow: 0 4px 12px rgba(44, 62, 80, 0.08);
}

.address-box code {
    flex: 1;
    font-family: 'Courier New', monospace;
    font-size: 0.9rem;
    word-break: break-all;
    color: var(--color-text);
}

.copy-btn {
    background: linear-gradient(135deg, var(--color-accent) 0%, var(--color-accent-light) 100%);
    color: white;
    border: none;
    padding: calc(var(--spacing-unit) * 1.5);
    cursor: pointer;
    transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
    display: flex;
    align-items: center;
    justify-content: center;
    border-radius: var(--radius-sm);
    box-shadow: 0 2px 8px rgba(44, 62, 80, 0.2);
}

.copy-btn:hover {
    transform: translateY(-2px);
    box-shadow: 0 4px 12px rgba(44, 62, 80, 0.3);
}

.copy-btn:active {
    transform: translateY(0);
}

.copy-btn.copied {
    background: linear-gradient(135deg, #27ae60 0%, #229954 100%);
}

.payment-steps {
    margin-top: calc(var(--spacing-unit) * 4);
}

.payment-steps ol {
    padding-left: calc(var(--spacing-unit) * 3);
}

.payment-steps li {
    padding: calc(var(--spacing-unit) * 2) calc(var(--spacing-unit) * 2);
    color: var(--color-text-secondary);
    line-height: 1.7;
    position: relative;
    margin-bottom: calc(var(--spacing-unit));
    border-radius: var(--radius-sm);
    transition: all 0.3s ease;
}

.payment-steps li:hover {
    background: rgba(44, 62, 80, 0.03);
    padding-left: calc(var(--spacing-unit) * 3);
}

/* Footer */
footer {
    padding: calc(var(--spacing-unit) * 6) 0;
    text-align: center;
    border-top: 1px solid var(--color-border);
}

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

/* Pricing and Purchase Page Specific */
.purchase-page {
    margin-top: 80px;
    padding-top: calc(var(--spacing-unit) * 10);
}

.purchase-page.pricing {
    padding-bottom: calc(var(--spacing-unit) * 8);
}

.purchase-page.contact {
    padding-top: calc(var(--spacing-unit) * 8);
}

/* Responsive */
@media (max-width: 768px) {
    .hero-content {
        grid-template-columns: 1fr;
        gap: calc(var(--spacing-unit) * 6);
    }

    .hero-text {
        text-align: center;
    }

    .hero-image {
        order: -1;
    }

    .hero h1 {
        font-size: 2.5rem;
    }

    .subtitle {
        font-size: 1.1rem;
    }

    .nav-links {
        gap: calc(var(--spacing-unit) * 2);
    }

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

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

    .pricing h2,
    .contact h2 {
        font-size: 2rem;
    }

    .address-box {
        flex-direction: column;
        align-items: stretch;
    }

    .copy-btn {
        width: 100%;
    }
}

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

/* Plan Selection Button */
.select-plan-btn {
    width: 100%;
    margin-top: calc(var(--spacing-unit) * 3);
    padding: calc(var(--spacing-unit) * 2) calc(var(--spacing-unit) * 3);
    background: linear-gradient(135deg, var(--color-accent) 0%, var(--color-accent-light) 100%);
    color: white;
    border: none;
    border-radius: var(--radius-md);
    font-size: 1rem;
    font-weight: 500;
    cursor: pointer;
    transition: all 0.3s ease;
    box-shadow: 0 2px 8px rgba(44, 62, 80, 0.2);
}

.select-plan-btn:hover {
    transform: translateY(-2px);
    box-shadow: 0 4px 16px rgba(44, 62, 80, 0.3);
}

/* Payment Page Styles */
.payment-back {
    margin-bottom: calc(var(--spacing-unit) * 4);
}

.back-link {
    display: inline-flex;
    align-items: center;
    gap: calc(var(--spacing-unit));
    color: var(--color-accent);
    text-decoration: none;
    font-size: 0.95rem;
    transition: all 0.3s ease;
}

.back-link:hover {
    gap: calc(var(--spacing-unit) * 1.5);
}

/* Order Section */
.payment-order-section {
    margin-bottom: calc(var(--spacing-unit) * 8);
}

.payment-order-section h2 {
    margin-bottom: calc(var(--spacing-unit) * 3);
    font-size: 1.75rem;
}

.order-card {
    background: linear-gradient(135deg, #ffffff 0%, #fafafa 100%);
    border: 2px solid var(--color-border);
    border-radius: var(--radius-lg);
    padding: calc(var(--spacing-unit) * 5);
    box-shadow: var(--shadow-md);
}

.order-header {
    display: flex;
    align-items: center;
    gap: calc(var(--spacing-unit) * 3);
    margin-bottom: calc(var(--spacing-unit) * 3);
}

.order-icon {
    width: 64px;
    height: 64px;
    background: linear-gradient(135deg, rgba(44, 62, 80, 0.1) 0%, rgba(44, 62, 80, 0.05) 100%);
    border-radius: var(--radius-md);
    display: flex;
    align-items: center;
    justify-content: center;
    color: var(--color-accent);
}

.order-title h3 {
    margin: 0 0 calc(var(--spacing-unit) / 2) 0;
    font-size: 1.25rem;
    color: var(--color-accent);
}

.order-title p {
    margin: 0;
    color: var(--color-text-secondary);
    font-size: 0.9rem;
}

.order-divider {
    height: 1px;
    background: linear-gradient(90deg, transparent, var(--color-border), transparent);
    margin: calc(var(--spacing-unit) * 3) 0;
}

.order-details {
    display: flex;
    flex-direction: column;
    gap: calc(var(--spacing-unit) * 2);
}

.order-row {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: calc(var(--spacing-unit) * 2);
    background: white;
    border-radius: var(--radius-sm);
}

.order-label {
    color: var(--color-text-secondary);
    font-size: 0.95rem;
}

.order-value {
    font-weight: 500;
    color: var(--color-text);
}

.total-row {
    background: linear-gradient(135deg, rgba(44, 62, 80, 0.05) 0%, rgba(44, 62, 80, 0.02) 100%);
    border: 2px solid var(--color-accent);
    padding: calc(var(--spacing-unit) * 3);
    margin-top: calc(var(--spacing-unit) * 2);
}

.order-total {
    font-size: 2rem;
    font-weight: 700;
    background: linear-gradient(135deg, var(--color-accent) 0%, var(--color-accent-light) 100%);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

/* Payment Method Section */
.payment-method-section h2 {
    margin-bottom: calc(var(--spacing-unit) * 3);
    font-size: 1.75rem;
}

.payment-card {
    background: white;
    border: 1px solid var(--color-border);
    border-radius: var(--radius-lg);
    padding: calc(var(--spacing-unit) * 5);
    box-shadow: var(--shadow-md);
}

.payment-method-header {
    display: flex;
    align-items: center;
    gap: calc(var(--spacing-unit) * 3);
    margin-bottom: calc(var(--spacing-unit) * 4);
    padding-bottom: calc(var(--spacing-unit) * 3);
    border-bottom: 1px solid var(--color-border);
}

.crypto-icon {
    width: 56px;
    height: 56px;
    display: flex;
    align-items: center;
    justify-content: center;
    border-radius: var(--radius-md);
    background: linear-gradient(135deg, #f0f9ff 0%, #e0f2fe 100%);
}

.payment-method-header h3 {
    margin: 0 0 calc(var(--spacing-unit) / 2) 0;
    font-size: 1.25rem;
}

.payment-method-header p {
    margin: 0;
    color: var(--color-text-secondary);
    font-size: 0.9rem;
}

.address-container {
    margin-bottom: calc(var(--spacing-unit) * 4);
}

.address-container label {
    display: block;
    margin-bottom: calc(var(--spacing-unit) * 1.5);
    font-weight: 500;
    color: var(--color-text);
}

.address-box-new {
    display: flex;
    align-items: center;
    gap: calc(var(--spacing-unit) * 2);
    padding: calc(var(--spacing-unit) * 3);
    background: linear-gradient(135deg, #fafafa 0%, #f5f5f5 100%);
    border: 2px solid var(--color-border);
    border-radius: var(--radius-md);
    transition: all 0.3s ease;
}

.address-box-new:hover {
    border-color: var(--color-accent);
}

.address-box-new code {
    flex: 1;
    font-family: 'Courier New', monospace;
    font-size: 0.9rem;
    word-break: break-all;
    color: var(--color-text);
    background: none;
    padding: 0;
}

.copy-btn-new {
    display: flex;
    align-items: center;
    gap: calc(var(--spacing-unit));
    padding: calc(var(--spacing-unit) * 1.5) calc(var(--spacing-unit) * 2);
    background: var(--color-accent);
    color: white;
    border: none;
    border-radius: var(--radius-sm);
    cursor: pointer;
    transition: all 0.3s ease;
    font-size: 0.9rem;
    font-weight: 500;
    white-space: nowrap;
}

.copy-btn-new:hover {
    background: var(--color-accent-light);
    transform: translateY(-2px);
}

.payment-amount-highlight {
    display: flex;
    align-items: baseline;
    justify-content: center;
    gap: calc(var(--spacing-unit) * 2);
    padding: calc(var(--spacing-unit) * 4);
    background: linear-gradient(135deg, rgba(44, 62, 80, 0.05) 0%, rgba(44, 62, 80, 0.02) 100%);
    border-radius: var(--radius-lg);
    margin-bottom: calc(var(--spacing-unit) * 4);
}

.amount-label {
    color: var(--color-text-secondary);
    font-size: 1rem;
}

.amount-value {
    font-size: 3rem;
    font-weight: 700;
    background: linear-gradient(135deg, var(--color-accent) 0%, var(--color-accent-light) 100%);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.amount-currency {
    font-size: 1.5rem;
    font-weight: 600;
    color: var(--color-accent);
}

.payment-instructions {
    margin-bottom: calc(var(--spacing-unit) * 4);
}

.payment-instructions h4 {
    margin-bottom: calc(var(--spacing-unit) * 3);
    font-size: 1.1rem;
}

.instruction-steps {
    display: flex;
    flex-direction: column;
    gap: calc(var(--spacing-unit) * 2);
}

.instruction-step {
    display: flex;
    align-items: flex-start;
    gap: calc(var(--spacing-unit) * 2);
    padding: calc(var(--spacing-unit) * 2);
    background: #f9f9f9;
    border-radius: var(--radius-md);
    transition: all 0.3s ease;
}

.instruction-step:hover {
    background: #f0f0f0;
    transform: translateX(4px);
}

.step-number {
    min-width: 32px;
    height: 32px;
    display: flex;
    align-items: center;
    justify-content: center;
    background: linear-gradient(135deg, var(--color-accent) 0%, var(--color-accent-light) 100%);
    color: white;
    border-radius: 50%;
    font-weight: 600;
    font-size: 0.9rem;
}

.step-content p {
    margin: 0;
    line-height: 32px;
    color: var(--color-text);
}

.payment-warning {
    display: flex;
    align-items: flex-start;
    gap: calc(var(--spacing-unit) * 2);
    padding: calc(var(--spacing-unit) * 3);
    background: linear-gradient(135deg, #fff3cd 0%, #fff8e1 100%);
    border-left: 4px solid #ffc107;
    border-radius: var(--radius-md);
}

.payment-warning svg {
    flex-shrink: 0;
    color: #f57c00;
}

.payment-warning p {
    margin: 0;
    color: #856404;
    line-height: 1.6;
}

.plan-detail-item .value {
    font-weight: 600;
    font-size: 1.1rem;
}

.plan-detail-item .price-value {
    color: var(--color-accent);
    font-size: 1.5rem;
}

.payment-notice {
    margin-top: calc(var(--spacing-unit) * 4);
    padding: calc(var(--spacing-unit) * 2);
    background: rgba(255, 193, 7, 0.1);
    border-left: 4px solid #ffc107;
    border-radius: var(--radius-sm);
}

.payment-notice p {
    color: #856404;
    margin: 0;
    font-size: 0.9rem;
}

/* Customer Service Widget */
.cs-widget {
    position: fixed;
    bottom: calc(var(--spacing-unit) * 3);
    right: calc(var(--spacing-unit) * 3);
    z-index: 9999;
}

.cs-toggle {
    width: 60px;
    height: 60px;
    border-radius: 50%;
    background: linear-gradient(135deg, var(--color-accent) 0%, var(--color-accent-light) 100%);
    color: white;
    border: none;
    cursor: pointer;
    box-shadow: 0 4px 16px rgba(44, 62, 80, 0.3);
    transition: all 0.3s ease;
    display: flex;
    align-items: center;
    justify-content: center;
}

.cs-toggle:hover {
    transform: translateY(-4px);
    box-shadow: 0 6px 24px rgba(44, 62, 80, 0.4);
}

.cs-chat {
    display: none;
    flex-direction: column;
    position: fixed;
    bottom: calc(var(--spacing-unit) * 12);
    right: calc(var(--spacing-unit) * 3);
    width: 360px;
    height: 500px;
    background: white;
    border-radius: var(--radius-lg);
    box-shadow: 0 8px 32px rgba(0, 0, 0, 0.15);
    overflow: hidden;
}

.cs-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: calc(var(--spacing-unit) * 2);
    background: linear-gradient(135deg, var(--color-accent) 0%, var(--color-accent-light) 100%);
    color: white;
}

.cs-header h4 {
    margin: 0;
    font-size: 1rem;
}

.cs-close {
    background: none;
    border: none;
    color: white;
    font-size: 1.5rem;
    cursor: pointer;
    width: 30px;
    height: 30px;
    display: flex;
    align-items: center;
    justify-content: center;
    border-radius: 50%;
    transition: background 0.3s ease;
}

.cs-close:hover {
    background: rgba(255, 255, 255, 0.2);
}

.cs-messages {
    flex: 1;
    padding: calc(var(--spacing-unit) * 2);
    overflow-y: auto;
    background: #f9f9f9;
}

.cs-message {
    margin-bottom: calc(var(--spacing-unit) * 2);
    animation: messageSlideIn 0.3s ease;
}

@keyframes messageSlideIn {
    from {
        opacity: 0;
        transform: translateY(10px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

.cs-message p {
    padding: calc(var(--spacing-unit) * 1.5);
    border-radius: var(--radius-md);
    margin: 0;
    max-width: 80%;
}

.cs-message.cs-bot p {
    background: white;
    color: var(--color-text);
    border: 1px solid var(--color-border);
}

.cs-message.cs-user p {
    background: var(--color-accent);
    color: white;
    margin-left: auto;
}

.cs-input-area {
    display: flex;
    padding: calc(var(--spacing-unit) * 2);
    border-top: 1px solid var(--color-border);
    gap: calc(var(--spacing-unit));
}

.cs-input-area input {
    flex: 1;
    padding: calc(var(--spacing-unit) * 1.5);
    border: 1px solid var(--color-border);
    border-radius: var(--radius-sm);
    font-size: 0.9rem;
    outline: none;
}

.cs-input-area input:focus {
    border-color: var(--color-accent);
}

.cs-input-area button {
    padding: calc(var(--spacing-unit) * 1.5) calc(var(--spacing-unit) * 3);
    background: var(--color-accent);
    color: white;
    border: none;
    border-radius: var(--radius-sm);
    cursor: pointer;
    transition: all 0.3s ease;
    font-weight: 500;
}

.cs-input-area button:hover {
    background: var(--color-accent-light);
}

/* Admin Panel Styles */
.admin-body {
    background: #f5f5f5;
}

.admin-notice {
    background: linear-gradient(135deg, #fff3cd 0%, #fff8e1 100%);
    border-bottom: 3px solid #ffc107;
    padding: calc(var(--spacing-unit) * 3);
}

.notice-content {
    max-width: 1200px;
    margin: 0 auto;
    display: flex;
    align-items: flex-start;
    gap: calc(var(--spacing-unit) * 2);
}

.notice-content svg {
    flex-shrink: 0;
    color: #f57c00;
}

.notice-content strong {
    color: #e65100;
}

.notice-content p {
    margin: calc(var(--spacing-unit) / 2) 0 0 0;
    color: #856404;
    line-height: 1.6;
}

.admin-container {
    display: flex;
    height: 100vh;
    overflow: hidden;
}

.admin-sidebar {
    width: 320px;
    background: white;
    border-right: 1px solid var(--color-border);
    display: flex;
    flex-direction: column;
}

.admin-header {
    padding: calc(var(--spacing-unit) * 3);
    border-bottom: 1px solid var(--color-border);
    background: linear-gradient(135deg, var(--color-accent) 0%, var(--color-accent-light) 100%);
    color: white;
}

.admin-header h2 {
    margin: 0 0 calc(var(--spacing-unit) * 2) 0;
    font-size: 1.25rem;
}

.auto-refresh {
    display: flex;
    align-items: center;
    font-size: 0.9rem;
}

.auto-refresh label {
    display: flex;
    align-items: center;
    gap: calc(var(--spacing-unit));
    cursor: pointer;
}

.auto-refresh input[type="checkbox"] {
    cursor: pointer;
}

.admin-sessions {
    flex: 1;
    overflow-y: auto;
    padding: calc(var(--spacing-unit) * 2);
}

.no-sessions {
    text-align: center;
    padding: calc(var(--spacing-unit) * 4);
    color: var(--color-text-secondary);
    font-size: 0.9rem;
}

.admin-session-item {
    padding: calc(var(--spacing-unit) * 2);
    margin-bottom: calc(var(--spacing-unit) * 2);
    background: #f9f9f9;
    border-radius: var(--radius-md);
    cursor: pointer;
    transition: all 0.3s ease;
    position: relative;
}

.admin-session-item:hover {
    background: #f0f0f0;
    transform: translateX(4px);
}

.admin-session-item.unread {
    background: #e3f2fd;
    border-left: 4px solid var(--color-accent);
}

.session-info h4 {
    margin: 0 0 calc(var(--spacing-unit) / 2) 0;
    font-size: 0.95rem;
}

.session-info .session-time {
    margin: 0 0 calc(var(--spacing-unit) / 2) 0;
    font-size: 0.8rem;
    color: var(--color-text-secondary);
}

.session-info .session-preview {
    margin: 0;
    font-size: 0.85rem;
    color: var(--color-text-secondary);
    overflow: hidden;
    text-overflow: ellipsis;
    white-space: nowrap;
}

.session-info p {
    margin: 0;
    font-size: 0.85rem;
    color: var(--color-text-secondary);
}

.unread-badge {
    position: absolute;
    top: calc(var(--spacing-unit) * 2);
    right: calc(var(--spacing-unit) * 2);
    background: #f44336;
    color: white;
    padding: calc(var(--spacing-unit) / 2) calc(var(--spacing-unit));
    border-radius: 12px;
    font-size: 0.75rem;
    font-weight: 600;
}

.admin-refresh-btn {
    margin: calc(var(--spacing-unit) * 2);
    padding: calc(var(--spacing-unit) * 2);
    background: var(--color-accent);
    color: white;
    border: none;
    border-radius: var(--radius-md);
    cursor: pointer;
    transition: all 0.3s ease;
    font-weight: 500;
}

.admin-refresh-btn:hover {
    background: var(--color-accent-light);
}

.admin-main {
    flex: 1;
    display: flex;
    flex-direction: column;
    background: white;
}

.admin-welcome {
    flex: 1;
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    color: var(--color-text-secondary);
}

.admin-welcome h3 {
    margin-bottom: calc(var(--spacing-unit) * 2);
}

.admin-chat-area {
    display: flex;
    flex-direction: column;
    height: 100%;
}

.admin-chat-messages {
    flex: 1;
    padding: calc(var(--spacing-unit) * 3);
    overflow-y: auto;
    background: #f9f9f9;
}

.admin-message {
    margin-bottom: calc(var(--spacing-unit) * 3);
    padding: calc(var(--spacing-unit) * 2);
    border-radius: var(--radius-md);
    max-width: 70%;
}

.admin-message.user {
    background: white;
    border: 1px solid var(--color-border);
    margin-right: auto;
}

.admin-message.admin {
    background: var(--color-accent);
    color: white;
    margin-left: auto;
}

.admin-message p {
    margin: 0 0 calc(var(--spacing-unit) / 2) 0;
}

.admin-message .timestamp {
    font-size: 0.75rem;
    opacity: 0.7;
}

.admin-reply-area {
    display: flex;
    padding: calc(var(--spacing-unit) * 3);
    border-top: 1px solid var(--color-border);
    gap: calc(var(--spacing-unit) * 2);
}

.admin-reply-area input {
    flex: 1;
    padding: calc(var(--spacing-unit) * 2);
    border: 1px solid var(--color-border);
    border-radius: var(--radius-md);
    font-size: 1rem;
    outline: none;
}

.admin-reply-area input:focus {
    border-color: var(--color-accent);
}

.admin-reply-area button {
    padding: calc(var(--spacing-unit) * 2) calc(var(--spacing-unit) * 4);
    background: var(--color-accent);
    color: white;
    border: none;
    border-radius: var(--radius-md);
    cursor: pointer;
    transition: all 0.3s ease;
    font-weight: 500;
    font-size: 1rem;
}

.admin-reply-area button:hover {
    background: var(--color-accent-light);
}

/* API Documentation Page Styles */
.api-docs-section {
    padding-top: calc(var(--spacing-unit) * 12);
}

.docs-header {
    text-align: center;
    margin-bottom: calc(var(--spacing-unit) * 8);
}

.docs-header h1 {
    font-size: 3rem;
    font-weight: 700;
    margin-bottom: calc(var(--spacing-unit) * 2);
    background: linear-gradient(135deg, #1a1a1a 0%, #2c3e50 100%);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

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

.trial-banner {
    background: linear-gradient(135deg, var(--color-accent) 0%, var(--color-accent-light) 100%);
    border-radius: var(--radius-lg);
    padding: calc(var(--spacing-unit) * 5);
    margin-bottom: calc(var(--spacing-unit) * 8);
    box-shadow: var(--shadow-lg);
}

.trial-content {
    display: flex;
    justify-content: space-between;
    align-items: center;
    gap: calc(var(--spacing-unit) * 4);
}

.trial-text h3 {
    color: white;
    margin: 0 0 calc(var(--spacing-unit)) 0;
    font-size: 1.5rem;
}

.trial-text p {
    color: rgba(255, 255, 255, 0.9);
    margin: 0;
}

.trial-btn {
    padding: calc(var(--spacing-unit) * 2) calc(var(--spacing-unit) * 4);
    background: white;
    color: var(--color-accent);
    border: none;
    border-radius: var(--radius-md);
    font-size: 1rem;
    font-weight: 600;
    cursor: pointer;
    transition: all 0.3s ease;
    box-shadow: 0 4px 12px rgba(0, 0, 0, 0.2);
    white-space: nowrap;
}

.trial-btn:hover {
    transform: translateY(-2px);
    box-shadow: 0 6px 20px rgba(0, 0, 0, 0.3);
}

.docs-section {
    margin-bottom: calc(var(--spacing-unit) * 6);
}

.docs-section h2 {
    font-size: 2rem;
    margin-bottom: calc(var(--spacing-unit) * 3);
    color: var(--color-text);
    padding-bottom: calc(var(--spacing-unit) * 2);
    border-bottom: 2px solid var(--color-border);
}

.docs-card {
    background: white;
    border: 1px solid var(--color-border);
    border-radius: var(--radius-lg);
    padding: calc(var(--spacing-unit) * 4);
    box-shadow: var(--shadow-sm);
}

.docs-card h3 {
    font-size: 1.25rem;
    margin-top: calc(var(--spacing-unit) * 3);
    margin-bottom: calc(var(--spacing-unit) * 2);
    color: var(--color-accent);
}

.docs-card h3:first-child {
    margin-top: 0;
}

.docs-card p {
    line-height: 1.8;
    color: var(--color-text-secondary);
    margin-bottom: calc(var(--spacing-unit) * 2);
}

.docs-card ul {
    margin: calc(var(--spacing-unit) * 2) 0;
    padding-left: calc(var(--spacing-unit) * 4);
}

.docs-card ul li {
    margin-bottom: calc(var(--spacing-unit));
    line-height: 1.8;
    color: var(--color-text-secondary);
}

.endpoint-box {
    display: flex;
    align-items: center;
    gap: calc(var(--spacing-unit) * 2);
    padding: calc(var(--spacing-unit) * 3);
    background: linear-gradient(135deg, #f0f9ff 0%, #e0f2fe 100%);
    border-radius: var(--radius-md);
    border-left: 4px solid var(--color-accent);
}

.method {
    display: inline-block;
    padding: calc(var(--spacing-unit) / 2) calc(var(--spacing-unit) * 2);
    background: var(--color-accent);
    color: white;
    border-radius: var(--radius-sm);
    font-weight: 600;
    font-size: 0.85rem;
}

.endpoint-box code {
    font-family: 'Courier New', monospace;
    font-size: 0.95rem;
    color: var(--color-text);
}

.code-block {
    background: #1e1e1e;
    border-radius: var(--radius-md);
    padding: calc(var(--spacing-unit) * 3);
    margin: calc(var(--spacing-unit) * 2) 0;
    overflow-x: auto;
}

.code-block pre {
    margin: 0;
}

.code-block code {
    font-family: 'Courier New', monospace;
    font-size: 0.9rem;
    line-height: 1.6;
    color: #d4d4d4;
}

.params-table {
    width: 100%;
    border-collapse: collapse;
    margin: calc(var(--spacing-unit) * 2) 0;
}

.params-table thead {
    background: linear-gradient(135deg, #f9f9f9 0%, #f5f5f5 100%);
}

.params-table th {
    padding: calc(var(--spacing-unit) * 2);
    text-align: left;
    font-weight: 600;
    color: var(--color-text);
    border-bottom: 2px solid var(--color-border);
}

.params-table td {
    padding: calc(var(--spacing-unit) * 2);
    border-bottom: 1px solid var(--color-border);
    color: var(--color-text-secondary);
}

.params-table td code {
    background: rgba(44, 62, 80, 0.05);
    padding: calc(var(--spacing-unit) / 2) calc(var(--spacing-unit));
    border-radius: var(--radius-sm);
    font-family: 'Courier New', monospace;
    font-size: 0.9rem;
    color: var(--color-accent);
}

.params-table tr:hover {
    background: #f9f9f9;
}

.support-card {
    background: linear-gradient(135deg, #f0f9ff 0%, #e0f2fe 100%);
    border: 2px solid #b3e5fc;
    border-radius: var(--radius-lg);
    padding: calc(var(--spacing-unit) * 5);
    text-align: center;
}

.support-card h3 {
    margin: 0 0 calc(var(--spacing-unit) * 2) 0;
    font-size: 1.5rem;
    color: var(--color-accent);
}

.support-card p {
    margin: 0 0 calc(var(--spacing-unit) * 3) 0;
    color: var(--color-text-secondary);
    line-height: 1.8;
}

.support-btn {
    padding: calc(var(--spacing-unit) * 2) calc(var(--spacing-unit) * 5);
    background: linear-gradient(135deg, var(--color-accent) 0%, var(--color-accent-light) 100%);
    color: white;
    border: none;
    border-radius: var(--radius-md);
    font-size: 1rem;
    font-weight: 600;
    cursor: pointer;
    transition: all 0.3s ease;
    box-shadow: 0 4px 12px rgba(44, 62, 80, 0.2);
}

.support-btn:hover {
    transform: translateY(-2px);
    box-shadow: 0 6px 20px rgba(44, 62, 80, 0.3);
}

/* Responsive for API Docs */
@media (max-width: 768px) {
    .docs-header h1 {
        font-size: 2rem;
    }

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

    .trial-btn {
        width: 100%;
    }

    .params-table {
        font-size: 0.85rem;
    }

    .params-table th,
    .params-table td {
        padding: calc(var(--spacing-unit));
    }

    .code-block {
        font-size: 0.8rem;
    }
}