:root {
    --primary-color: #00BEBD; /* BOSS绿 */
    --dark-bg: #0b0e14;
    --card-bg: #161b22;
    --text-main: #e6edf3;
    --text-gray: #8b949e;
    --border-color: #30363d;
}

* { margin: 0; padding: 0; box-sizing: border-box; }
body { font-family: "PingFang SC", sans-serif; background: var(--dark-bg); color: var(--text-main); line-height: 1.6; }

/* --- 导航栏 --- */
nav { display: flex; justify-content: space-between; align-items: center; padding: 20px 5%; background: rgba(11, 14, 20, 0.95); position: sticky; top: 0; z-index: 100; border-bottom: 1px solid var(--border-color); }
.logo { font-size: 22px; font-weight: bold; color: var(--text-main); text-decoration: none; }
.logo span { color: var(--primary-color); }
.nav-links { display: flex; gap: 30px; }
.nav-links a { color: var(--text-gray); text-decoration: none; font-size: 15px; transition: 0.3s; }
.nav-links a:hover, .nav-links a.active { color: var(--primary-color); }

/* --- 页面标题 --- */
.page-header { padding: 80px 5% 40px; text-align: center; background: linear-gradient(to bottom, #1c2128, var(--dark-bg)); }
.page-header h1 { font-size: 2.5rem; margin-bottom: 15px; }
.page-header h1 span { color: var(--primary-color); }
.page-header p { color: var(--text-gray); max-width: 600px; margin: 0 auto; }

/* --- FAQ 主体 --- */
.faq-container { max-width: 900px; margin: 40px auto 100px; padding: 0 5%; }

.faq-category { margin-bottom: 40px; }
.category-name { 
    font-size: 1.2rem; 
    color: var(--primary-color); 
    margin-bottom: 20px; 
    display: flex; 
    align-items: center; 
    gap: 10px;
}
.category-name::after { content: ""; flex: 1; height: 1px; background: var(--border-color); }

.faq-item { 
    background: var(--card-bg); 
    border: 1px solid var(--border-color); 
    border-radius: 8px; 
    margin-bottom: 15px; 
    overflow: hidden; 
}

.faq-question { 
    padding: 20px 25px; 
    cursor: pointer; 
    display: flex; 
    justify-content: space-between; 
    align-items: center; 
    font-weight: bold;
    transition: 0.3s;
}
.faq-question:hover { background: #1c2128; }

.faq-question::after { 
    content: "+"; 
    font-size: 1.5rem; 
    color: var(--primary-color); 
    transition: 0.3s; 
}

.faq-item.active .faq-question::after { transform: rotate(45deg); }
.faq-item.active { border-color: var(--primary-color); }

.faq-answer { 
    max-height: 0; 
    overflow: hidden; 
    transition: max-height 0.3s ease-out; 
    background: rgba(255,255,255,0.02);
}
.answer-content { padding: 0 25px 25px; color: var(--text-gray); font-size: 0.95rem; border-top: 1px solid rgba(48, 54, 61, 0.5); padding-top: 15px; }
.answer-content strong { color: var(--primary-color); }

/* --- 底部咨询 --- */
.cta-box { text-align: center; padding: 60px 5%; background: var(--card-bg); border-radius: 12px; margin-bottom: 80px; }
.cta-box h3 { margin-bottom: 15px; }
.btn-chat { background: var(--primary-color); color: #fff; padding: 12px 35px; border-radius: 5px; text-decoration: none; font-weight: bold; display: inline-block; }

footer { padding: 40px 5%; border-top: 1px solid var(--border-color); text-align: center; color: #555; font-size: 13px; }

@media (max-width: 768px) {
    .nav-links { display: none; } /* Wap端建议后续加汉堡菜单 */
    .service-visual { min-height: 260px; padding: 20px; }
}