body {
    font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, sans-serif;
    margin: 0;
    background-color: #f0f2f5;
    color: #333;
    display: flex;
    flex-direction: column;
    height: 100vh;
    overflow: hidden; 
}

header {
    background-color: #FF4500; 
    padding: 0 30px; 
    height: 70px; 
    display: flex;
    align-items: center;
    border-bottom: 4px solid #EEEEEE; 
    box-shadow: 0 2px 8px rgba(0,0,0,0.1);
    box-sizing: border-box;
    flex-shrink: 0;
    z-index: 10;
}

.header-left {
    display: flex;
    align-items: center;
    height: 100%;
}

/* 你自己的 Logo 尺寸控制 */
.site-logo {
    height: 35px; 
    width: auto;
    display: block;
}

/* 竖线分隔符 */
.header-divider {
    width: 2px;
    height: 24px;
    background-color: #FFFFFF;
    opacity: 0.5;
    margin: 0 16px; 
}

/* 我为你生成的标题 SVG 尺寸控制 */
.site-title-svg {
    height: 24px; 
    width: auto;
    display: block;
}

.container { display: flex; flex: 1; overflow: hidden; }
nav { width: 320px; background: #fff; border-right: 1px solid #dcdcdc; overflow-y: auto; flex-shrink: 0; }
nav ul { list-style: none; padding: 0; margin: 0; }
nav li { padding: 18px 20px; border-bottom: 1px solid #f0f0f0; cursor: pointer; transition: all 0.2s ease; font-size: 14px; color: #555; display: flex; align-items: center; line-height: 1.4; }
nav li:hover { background-color: #f7f9fc; color: #FF4500; }
nav li.active { background-color: #fff0eb; color: #FF4500; font-weight: 600; border-left: 5px solid #FF4500; }
nav li .icon { margin-right: 10px; font-size: 18px; width: 24px; text-align: center; }
.menu-label { padding: 20px 20px 5px; font-size: 12px; font-weight: bold; color: #999; text-transform: uppercase; }
.tag-required { background-color: #d93025; color: white; font-size: 10px; padding: 2px 6px; border-radius: 4px; margin-left: auto; font-weight: bold; text-transform: uppercase; }

main { flex: 1; padding: 40px; overflow-y: auto; background-color: #f0f2f5; }
.card { max-width: 900px; margin: 0 auto; background: #fff; padding: 40px; border-radius: 12px; box-shadow: 0 4px 20px rgba(0,0,0,0.05); }
h2 { margin-top: 0; color: #1a1a1a; font-size: 26px; margin-bottom: 5px; }
.sub-header { color: #666; margin-bottom: 25px; border-bottom: 2px solid #eaeaea; padding-bottom: 15px; font-size: 14px; }
video { width: 100%; height: auto; background: #000; border-radius: 8px; margin-bottom: 20px; box-shadow: 0 4px 10px rgba(0,0,0,0.1); display: block; }
.resources { background: #fff8e1; border: 1px solid #ffeeba; padding: 20px; border-radius: 8px; margin-bottom: 30px; display: flex; align-items: center; justify-content: space-between; }
.btn-policy { text-decoration: none; background-color: #d93025; color: white; padding: 10px 20px; border-radius: 4px; font-size: 14px; font-weight: 500; transition: background 0.2s; }
.btn-policy:hover { background-color: #b01c11; }
.instructions h3 { font-size: 18px; color: #333; margin-bottom: 15px; font-weight: 600; }
ol { padding-left: 20px; color: #444; }
li.step { margin-bottom: 10px; line-height: 1.6; }
li.step a { color: #FF4500; text-decoration: none; font-weight: 500; }
footer { background-color: #fff; border-top: 1px solid #e0e0e0; padding: 10px 20px; text-align: center; font-size: 11px; color: #999; flex-shrink: 0; }

p, li { line-height: 1.6; margin-bottom: 10px; }
ul { padding-left: 20px; }
.policy-content h3 { margin-top: 25px; margin-bottom: 10px; color: #FF4500; border-left: 4px solid #FF4500; padding-left: 10px; font-size: 18px; }
.policy-content p { margin-bottom: 15px; line-height: 1.6; color: #444; }
.policy-content ul { margin-bottom: 20px; padding-left: 20px; }
.policy-content li { margin-bottom: 8px; line-height: 1.5; }
.btn-back { display: block; width: 200px; margin: 30px auto 0; padding: 12px; text-align: center; background: #FF4500; color: #fff; text-decoration: none; border-radius: 6px; font-weight: bold; }
.btn-back:hover { background: #CC3700; }

@media screen and (max-width: 768px) {
    body { height: auto !important; overflow-y: auto !important; display: block; }
    .container { flex-direction: column; overflow: visible !important; height: auto !important; display: block; }
    nav { width: 100%; border-right: none; border-bottom: 1px solid #dcdcdc; height: auto; overflow-y: visible !important; }
    main { padding: 15px; overflow: visible !important; height: auto !important; }
    .card { padding: 20px; box-shadow: none; }
    .resources { flex-direction: column; align-items: flex-start; gap: 10px; }
    .btn-policy { width: 100%; text-align: center; box-sizing: border-box; }
}