:root {
    --primary-color: #2563EB;
    --primary-dark: #1E40AF;
    --text-color: #334155;
    --heading-color: #0F172A;
    --bg-color: #F8FAFC;
    --card-bg: #FFFFFF;
    --border-color: #E2E8F0;
    --sidebar-width: 280px;
}

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

body {
    font-family: 'Inter', -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
    color: var(--text-color);
    background-color: var(--bg-color);
    line-height: 1.6;
    font-size: 16px;
}

h1, h2, h3, h4 {
    color: var(--heading-color);
    font-weight: 600;
    line-height: 1.3;
}

a {
    color: var(--primary-color);
    text-decoration: none;
    transition: color 0.2s;
}

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

.container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 24px;
}

/* Header */
.header {
    background-color: var(--card-bg);
    border-bottom: 1px solid var(--border-color);
    position: sticky;
    top: 0;
    z-index: 100;
}

.header-content {
    display: flex;
    justify-content: space-between;
    align-items: center;
    height: 72px;
}

.logo {
    display: flex;
    align-items: center;
    gap: 8px;
    font-size: 24px;
    font-weight: 700;
    color: var(--heading-color);
}

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

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

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

/* Main Layout */
.main-content {
    display: flex;
    gap: 48px;
    margin-top: 48px;
    margin-bottom: 64px;
    align-items: flex-start;
}

/* Sidebar */
.sidebar {
    width: var(--sidebar-width);
    flex-shrink: 0;
    position: sticky;
    top: 100px;
}

.toc h3 {
    margin-bottom: 16px;
    font-size: 14px;
    text-transform: uppercase;
    letter-spacing: 0.05em;
    color: var(--text-color);
}

.toc ul {
    list-style: none;
    border-left: 2px solid var(--border-color);
}

.toc li {
    margin-bottom: 8px;
}

.toc a {
    display: block;
    padding: 4px 0 4px 16px;
    color: #64748B;
    font-size: 14px;
    border-left: 2px solid transparent;
    margin-left: -2px;
    transition: all 0.2s;
}

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

.toc a.active {
    color: var(--primary-color);
    font-weight: 500;
    border-left-color: var(--primary-color);
}

/* Content Area */
.policy-content {
    flex-grow: 1;
    background-color: var(--card-bg);
    padding: 48px;
    border-radius: 12px;
    box-shadow: 0 4px 6px -1px rgb(0 0 0 / 0.05), 0 2px 4px -2px rgb(0 0 0 / 0.05);
}

.policy-content h1 {
    font-size: 36px;
    margin-bottom: 8px;
}

.last-updated {
    color: #64748B;
    margin-bottom: 48px;
    font-size: 15px;
}

.policy-content section {
    margin-bottom: 40px;
}

.policy-content h2 {
    font-size: 24px;
    margin-bottom: 16px;
    padding-bottom: 8px;
    border-bottom: 1px solid var(--border-color);
}

.policy-content h3 {
    font-size: 18px;
    margin-top: 24px;
    margin-bottom: 12px;
}

.policy-content p {
    margin-bottom: 16px;
}

.policy-content ul {
    margin-bottom: 16px;
    padding-left: 24px;
}

.policy-content li {
    margin-bottom: 8px;
}

/* Contact Card */
.contact-card {
    background-color: var(--bg-color);
    padding: 24px;
    border-radius: 8px;
    border: 1px solid var(--border-color);
    margin-top: 16px;
}

/* Footer */
.footer {
    background-color: var(--heading-color);
    color: #94A3B8;
    padding: 32px 0;
    text-align: center;
    margin-top: auto;
}

/* Scroll to top button */
#scrollToTop {
    display: none;
    position: fixed;
    bottom: 30px;
    right: 30px;
    z-index: 99;
    border: none;
    outline: none;
    background-color: var(--primary-color);
    color: white;
    cursor: pointer;
    padding: 15px;
    border-radius: 50%;
    font-size: 18px;
    width: 50px;
    height: 50px;
    box-shadow: 0 4px 6px rgba(0,0,0,0.1);
    transition: background-color 0.3s, transform 0.2s;
}

#scrollToTop:hover {
    background-color: var(--primary-dark);
    transform: translateY(-3px);
}

/* Responsive */
@media (max-width: 900px) {
    .main-content {
        flex-direction: column;
    }
    
    .sidebar {
        width: 100%;
        position: static;
        margin-bottom: 0;
    }

    .toc ul {
        display: flex;
        flex-wrap: wrap;
        gap: 12px;
        border-left: none;
    }

    .toc li {
        margin-bottom: 0;
    }

    .toc a {
        background-color: var(--card-bg);
        padding: 8px 12px;
        border-radius: 6px;
        border: 1px solid var(--border-color);
        margin-left: 0;
    }

    .toc a.active {
        border-color: var(--primary-color);
        background-color: #EFF6FF;
    }

    .policy-content {
        padding: 32px 24px;
    }
}

@media (max-width: 600px) {
    .policy-content h1 {
        font-size: 28px;
    }
}