:root {
    --sub-bg: #f0f2f5;
    --sub-text: #333333;
    --sub-primary: #00bcd4; /* Light Blue/Cyan */
    --sub-secondary: #ffffff;
    --sub-accent: #ffc107; /* Amber */
    --sub-border: #e0e0e0;
}

* { margin: 0; padding: 0; box-sizing: border-box; }
body {
    background-color: var(--sub-bg); color: var(--sub-text);
    font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
    line-height: 1.7; overflow-x: hidden;
}

.sub-container { max-width: 900px; margin: 0 auto; padding: 0 30px;}

/* Header */
.sub-header {
    display: flex; justify-content: space-between; align-items: center;
    padding: 30px 0; margin-bottom: 40px; border-bottom: 2px solid var(--sub-primary);
}
.sub-brand {
    font-size: 24px; font-weight: bold; color: var(--sub-primary);
    display: flex; align-items: center; gap: 10px;
}
.sub-brand::before {
    content: '📄'; font-size: 26px;
}
.sub-nav { display: flex; gap: 20px; }
.sub-nav a {
    font-size: 15px; font-weight: 600; color: #666; text-decoration: none;
    padding: 8px 15px; border-radius: 4px; transition: all 0.2s;
}
.sub-nav a:hover, .sub-nav a.active { color: #fff; background: var(--sub-primary); }

/* Hero */
.sub-hero {
    text-align: center; margin-bottom: 60px; padding: 50px 20px;
    background: var(--sub-secondary); border-radius: 8px;
    box-shadow: 0 2px 10px rgba(0,0,0,0.05); border-top: 5px solid var(--sub-primary);
}
.sub-hero h1 {
    font-size: 32px; color: #222; margin-bottom: 15px;
}
.sub-hero p { font-size: 16px; color: #666; margin-bottom: 30px;}

.btn-sub {
    display: inline-block; padding: 12px 30px; font-size: 15px; font-weight: bold;
    color: #fff; background: var(--sub-primary); border-radius: 4px;
    text-decoration: none; transition: background 0.2s;
}
.btn-sub:hover { background: #0097a7; }

/* Content */
.sub-content { background: var(--sub-secondary); padding: 40px; border-radius: 8px; box-shadow: 0 2px 10px rgba(0,0,0,0.05); margin-bottom: 60px;}
.sub-content h2 { font-size: 22px; color: var(--sub-primary); margin-bottom: 20px; border-bottom: 1px solid var(--sub-border); padding-bottom: 10px;}
.sub-content p { font-size: 15px; color: #555; margin-bottom: 15px; text-align: justify;}
.sub-content ul { margin-left: 20px; margin-bottom: 20px;}
.sub-content li { font-size: 15px; color: #555; margin-bottom: 10px;}

.info-box {
    background: #e0f7fa; padding: 20px; border-left: 4px solid var(--sub-primary);
    margin-bottom: 20px; font-size: 14px; color: #006064;
}

/* FAQ */
.sub-faq { margin-bottom: 80px; }
.sub-faq h2 { font-size: 24px; text-align: center; margin-bottom: 40px; color: #222;}
.s-faq-item {
    background: var(--sub-secondary); padding: 20px; border-radius: 8px;
    margin-bottom: 15px; border: 1px solid var(--sub-border);
}
.s-fq { font-size: 16px; font-weight: bold; color: #222; margin-bottom: 10px;}
.s-fa { font-size: 15px; color: #666;}

footer {
    text-align: center; padding: 30px 0; color: #999; font-size: 13px;
    border-top: 1px solid var(--sub-border);
}

@media (max-width: 768px) {
    .sub-header { flex-direction: column; gap: 15px; }
    .sub-content { padding: 25px; }
}