/* ==========================================
   FAQs 页专属样式
   ========================================== */

/* ---------- Hero (已对齐全站高级风格) ---------- */
.faq-hero {
    position: relative;
    min-height: 520px;
    display: flex;
    align-items: center;
    padding: 100px 20px;
    overflow: hidden;
    color: #fff;
    background: #0a1f3d;
}
.faq-hero-overlay {
    position: absolute; inset: 0;
    background: url('/images/banner/banner-heavy-duty-profile-cnc-machining.webp') center/cover no-repeat;
    opacity: 0.4;
    z-index: 1;
}
.faq-hero::after {
    content: "";
    position: absolute; inset: 0;
    background: linear-gradient(90deg, rgba(15,42,74,0.92) 0%, rgba(15,42,74,0.6) 55%, rgba(15,42,74,0.35) 100%);
    z-index: 2;
}
.faq-hero-content {
    position: relative;
    z-index: 3;
    max-width: 1200px;
    margin: 0 auto;
    width: 100%;
}
.faq-hero-label {
    display: inline-block;
    background: rgba(56, 189, 248, 0.15);
    border: 1px solid rgba(56, 189, 248, 0.4);
    color: #38bdf8;
    padding: 6px 16px;
    border-radius: 4px;
    font-size: 12px;
    letter-spacing: 1.5px;
    margin-bottom: 22px;
    font-weight: 600;
    text-transform: uppercase;
}
.faq-hero h1 {
    font-size: 52px;
    font-weight: 800;
    line-height: 1.15;
    letter-spacing: -0.5px;
    margin: 0 0 20px;
    color: #fff;
}
.faq-hero p {
    font-size: 17px;
    color: #cbd5e1;
    line-height: 1.7;
    max-width: 680px;
    margin: 0 0 32px;
}
.faq-hero-cta { 
    display: flex; 
    gap: 14px; 
    flex-wrap: wrap; 
}
.faq-hero-btn { 
    display: inline-block; 
    background: #1d6fe8; 
    color: #fff; 
    padding: 14px 30px; 
    border-radius: 6px; 
    text-decoration: none; 
    font-size: 15px; 
    font-weight: 600; 
    transition: all 0.25s; 
    border: 1px solid #1d6fe8; 
}
.faq-hero-btn:hover { 
    background: #1557b8; 
    border-color: #1557b8; 
    transform: translateY(-2px); 
}
.faq-hero-btn-outline { 
    display: inline-block; 
    background: transparent; 
    color: #fff; 
    padding: 14px 30px; 
    border-radius: 6px; 
    text-decoration: none; 
    font-size: 15px; 
    font-weight: 600; 
    border: 1px solid rgba(255,255,255,0.4); 
    transition: all 0.25s; 
}
.faq-hero-btn-outline:hover { 
    background: rgba(255,255,255,0.1); 
    border-color: #fff; 
    transform: translateY(-2px); 
}

/* ---------- Main ---------- */
.faq-main {
    padding: 70px 20px 80px;
    background: var(--c-bg-soft);
}
.faq-grid {
    max-width: 1200px;
    margin: 0 auto 60px;
    display: grid;
    grid-template-columns: 260px 1fr;
    gap: 50px;
    align-items: start;
}

/* Sidebar */
.faq-sidebar {
    background: #fff;
    border: 1px solid var(--c-border);
    border-radius: 12px;
    padding: 26px 22px;
    position: sticky;
    top: 100px;
}
.faq-sidebar h3 {
    font-size: 16px;
    color: var(--c-dark);
    margin: 0 0 18px;
    padding-bottom: 12px;
    border-bottom: 2px solid var(--c-primary-light);
    font-weight: 700;
}
.faq-cat-list {
    list-style: none;
    padding: 0;
    margin: 0;
}
.faq-cat-list li {
    padding: 12px 14px;
    font-size: 14px;
    color: #475569;
    border-radius: 6px;
    cursor: pointer;
    transition: all 0.2s;
    margin-bottom: 4px;
}
.faq-cat-list li:hover {
    background: #f1f5f9;
    color: var(--c-primary);
}
.faq-cat-list li.active {
    background: var(--c-primary);
    color: #fff;
    font-weight: 600;
}

/* FAQ Content */
.faq-content {
    background: #fff;
    border: 1px solid var(--c-border);
    border-radius: 12px;
    padding: 40px 40px 20px;
}
.faq-group {
    display: none;
}
.faq-group.active {
    display: block;
}
.faq-group h2 {
    font-size: 24px;
    color: var(--c-dark);
    margin: 0 0 30px;
    font-weight: 700;
    padding-bottom: 16px;
    border-bottom: 2px solid #f1f5f9;
}

/* FAQ Item */
.faq-item {
    border-bottom: 1px solid #f1f5f9;
    padding: 4px 0;
}
.faq-item:last-child { border-bottom: none; }

.faq-item > summary {
    list-style: none;
    cursor: pointer;
    padding: 20px 40px 20px 0;
    font-size: 16px;
    font-weight: 600;
    color: var(--c-dark);
    position: relative;
    transition: color 0.2s;
    line-height: 1.5;
}
.faq-item > summary::-webkit-details-marker { display: none; }
.faq-item > summary::marker { display: none; content: ''; }
.faq-item > summary:hover { color: var(--c-primary); }

.faq-item > summary::after {
    content: "+";
    position: absolute;
    right: 0;
    top: 50%;
    transform: translateY(-50%);
    font-size: 24px;
    font-weight: 300;
    color: var(--c-primary);
    transition: transform 0.3s ease;
    line-height: 1;
}
.faq-item[open] > summary { color: var(--c-primary); }
.faq-item[open] > summary::after {
    content: "−";
    transform: translateY(-50%) rotate(180deg);
}

.faq-answer {
    padding: 0 40px 22px 0;
    font-size: 14px;
    color: #475569;
    line-height: 1.8;
}
.faq-answer p { margin: 0; }

/* CTA */
.faq-cta {
    max-width: 1200px;
    margin: 0 auto;
}
.faq-cta-inner {
    background: #eef2ff;
    border: 1px solid #dbeafe;
    border-radius: 14px;
    padding: 32px 40px;
    display: flex;
    justify-content: space-between;
    align-items: center;
    gap: 30px;
    flex-wrap: wrap;
}
.faq-cta-left {
    display: flex;
    gap: 22px;
    align-items: flex-start;
    flex: 1;
    min-width: 300px;
}
.faq-cta-icon {
    font-size: 40px;
    flex-shrink: 0;
    color: var(--c-primary);
}
.faq-cta-label {
    font-size: 12px;
    color: var(--c-primary);
    font-weight: 700;
    letter-spacing: 1.5px;
    margin-bottom: 8px;
}
.faq-cta h3 {
    font-size: 22px;
    font-weight: 800;
    color: var(--c-dark);
    margin: 0 0 8px;
}
.faq-cta p {
    font-size: 14px;
    color: #475569;
    margin: 0;
    line-height: 1.5;
}
.faq-cta-btn {
    display: inline-block;
    background: var(--c-primary);
    color: #fff;
    padding: 14px 32px;
    border-radius: 8px;
    text-decoration: none;
    font-size: 15px;
    font-weight: 600;
    white-space: nowrap;
    transition: background 0.2s;
}
.faq-cta-btn:hover { background: var(--c-primary-hover); }

/* Responsive */
@media (max-width: 1100px) {
    .faq-hero h1 { font-size: 42px; }
    .faq-grid { grid-template-columns: 1fr; gap: 30px; }
    .faq-sidebar { position: static; }
    .faq-cat-list { display: flex; flex-wrap: wrap; gap: 8px; }
    .faq-cat-list li { flex-shrink: 0; margin: 0; padding: 8px 16px; }
}
@media (max-width: 700px) {
    .faq-hero { min-height: 340px; padding: 60px 20px; }
    .faq-hero h1 { font-size: 34px; }
    .faq-hero p { font-size: 15px; }
    .faq-content { padding: 24px 22px 10px; }
    .faq-group h2 { font-size: 20px; }
    .faq-item > summary { font-size: 15px; padding: 16px 34px 16px 0; }
    .faq-cta-inner { padding: 24px; flex-direction: column; align-items: flex-start; }
    .faq-cta-btn { width: 100%; text-align: center; }
    .faq-hero-cta { flex-direction: column; }
    .faq-hero-btn, .faq-hero-btn-outline { text-align: center; }
}