:root {
    --primary: #0052D4;
    --primary-hover: #0041a8;
    --accent: #1EAF5B;
    --bg: #f8fafc;
    --card-bg: #ffffff;
    --text-main: #0f172a;
    --text-muted: #64748b;
    --border: #e2e8f0;
    --badge-bg: #F0F5FF;
    --radius-lg: 24px;
    --radius-md: 16px;
    --shadow-sm: 0 1px 3px 0 rgb(0 0 0 / 0.1);
    --shadow-md: 0 10px 15px -3px rgb(0 0 0 / 0.1);
}

* { margin: 0; padding: 0; box-sizing: border-box; font-family: 'Plus Jakarta Sans', sans-serif; -webkit-font-smoothing: antialiased; }
body {
    background-color: var(--bg);
    color: var(--text-main);
    line-height: 1.6;
    background-image: radial-gradient(at 0% 0%, rgba(0, 82, 212, 0.05) 0px, transparent 50%);
}

/* Header */
header {
    padding: 0.75rem 0;
    background: rgba(255, 255, 255, 0.8);
    backdrop-filter: blur(12px);
    position: sticky;
    top: 0;
    z-index: 100;
    border-bottom: 1px solid var(--border);
}
.navbar {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 1.5rem;
    display: flex;
    justify-content: space-between;
    align-items: center;
}
.logo { text-decoration: none; display: flex; align-items: center; }
.main-logo { height: 40px; width: auto; display: block; }
.mobile-logo { display: none; }

.btn-back {
    text-decoration: none;
    color: var(--primary);
    font-weight: 700;
    font-size: 0.9rem;
    padding: 0.6rem 1.2rem;
    border: 1px solid var(--border);
    border-radius: 12px;
    transition: all 0.2s;
}
.btn-back:hover { background: #f1f5f9; border-color: var(--primary); }

/* Layout */
.container { max-width: 1100px; margin: 4rem auto; padding: 0 1.5rem; }
.header-section { text-align: center; margin-bottom: 4rem; }
h1 { font-size: 3rem; font-weight: 800; letter-spacing: -0.04em; margin-bottom: 1rem; }
.subtitle { color: var(--text-muted); font-size: 1.25rem; }

.doc-layout {
    display: flex;
    gap: 4rem;
    align-items: flex-start;
}

/* Sidebar */
.doc-sidebar {
    flex: 0 0 250px;
    position: sticky;
    top: 100px;
}
.doc-sidebar ul { list-style: none; }
.doc-sidebar li { margin-bottom: 0.75rem; }
.doc-sidebar a {
    text-decoration: none;
    color: var(--text-muted);
    font-weight: 600;
    font-size: 1rem;
    transition: all 0.2s;
    display: block;
    padding: 8px 0;
}
.doc-sidebar a:hover { color: var(--primary); transform: translateX(5px); }

/* Content */
.doc-content { flex: 1; }
.doc-content section { margin-bottom: 5rem; scroll-margin-top: 120px; }
.doc-content h2 {
    font-size: 1.75rem;
    font-weight: 800;
    margin-bottom: 1.5rem;
    display: flex;
    align-items: center;
    gap: 12px;
}
.doc-content h2::before {
    content: '';
    width: 4px;
    height: 24px;
    background: var(--primary);
    border-radius: 4px;
}
.doc-content p { color: var(--text-main); margin-bottom: 1.25rem; font-size: 1.05rem; }
.doc-content ul { margin-left: 1.5rem; margin-bottom: 1.25rem; }
.doc-content li { margin-bottom: 0.5rem; color: var(--text-main); }

.info-card {
    background: var(--badge-bg);
    padding: 1.5rem;
    border-radius: 16px;
    border: 1px solid #dbeafe;
    color: var(--primary);
    font-size: 0.95rem;
}

/* Terms List */
.terms-list dt {
    font-weight: 800;
    color: var(--text-main);
    font-size: 1.1rem;
    margin-top: 2rem;
    color: var(--primary);
}
.terms-list dd {
    margin-top: 0.5rem;
    color: var(--text-muted);
    font-size: 0.95rem;
}

/* Footer */
footer {
    padding: 4rem 1.5rem;
    text-align: center;
    background: white;
    border-top: 1px solid var(--border);
    margin-top: 4rem;
}
.footer-logo { height: 30px; width: auto; margin-bottom: 1.5rem; opacity: 0.7; }
footer p { color: var(--text-muted); font-size: 0.95rem; font-weight: 500; }

/* Responsive */
@media (max-width: 800px) {
    .doc-layout { flex-direction: column; gap: 2rem; }
    .doc-sidebar {
        position: static;
        width: 100%;
        padding-bottom: 2rem;
        border-bottom: 1px solid var(--border);
        margin-bottom: 2rem;
    }
    .doc-sidebar ul {
        display: flex;
        flex-wrap: wrap;
        gap: 1rem;
    }
    .main-logo { display: none; }
    .mobile-logo { display: block; height: 32px; }
}