/* ============================================================
   贵金属交易页面专用样式（PC 端）
   ============================================================ */

/* ============================================================
   1. 交易流程概述
============================================================ */
.pm-process {
    background: linear-gradient(135deg, #071c47 0%, #0b2a6b 100%);
    color: #fff;
    padding: 80px 6%;
}

.pm-section-head {
    text-align: center;
    margin-bottom: 46px;
}

.pm-section-head.light h2,
.pm-section-head.light p {
    color: #fff;
}

.pm-section-head h2 {
    font-size: 32px;
    font-weight: 700;
    margin-bottom: 12px;
}

.pm-section-head p {
    font-size: 15px;
    color: rgba(255, 255, 255, 0.75);
    max-width: 640px;
    margin: 0 auto;
    line-height: 1.7;
}

.pm-process-grid {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: 22px;
    max-width: 1160px;
    margin: 0 auto 40px;
}

.pm-process-card {
    background: rgba(255, 255, 255, 0.07);
    border: 1px solid rgba(255, 255, 255, 0.12);
    border-radius: 12px;
    padding: 28px 22px;
    text-align: center;
    transition: transform 0.35s ease, background 0.35s ease;
}

.pm-process-card:hover {
    transform: translateY(-6px);
    background: rgba(255, 255, 255, 0.12);
}

.pm-process-card h3 {
    font-size: 18px;
    font-weight: 700;
    margin-bottom: 12px;
    color: var(--accent-color);
}

.pm-process-card p {
    font-size: 14px;
    color: rgba(255, 255, 255, 0.82);
    line-height: 1.7;
}

.pm-process-action {
    text-align: center;
}

.pm-btn-light {
    display: inline-block;
    background: #fff;
    color: var(--primary-color);
    font-size: 15px;
    font-weight: 600;
    padding: 12px 36px;
    border-radius: 30px;
    transition: transform 0.3s ease, box-shadow 0.3s ease;
}

.pm-btn-light:hover {
    transform: translateY(-2px);
    box-shadow: 0 8px 24px rgba(245, 184, 0, 0.35);
}

/* ============================================================
   2. 市场动态解析
============================================================ */
.pm-market {
    background: #f4f6fb;
    padding: 80px 6%;
    text-align: center;
}

.pm-market .pm-section-head h2 {
    color: var(--primary-color);
}

.pm-market .pm-section-head p {
    color: var(--text-sub);
}

.pm-empty {
    display: inline-block;
    background: #fff;
    color: var(--text-sub);
    font-size: 15px;
    padding: 22px 44px;
    border-radius: 8px;
    box-shadow: 0 4px 16px rgba(11, 42, 107, 0.06);
    border: 1px dashed rgba(11, 42, 107, 0.15);
}

/* ============================================================
   3. 智能交易平台
============================================================ */
.pm-platform {
    background: linear-gradient(135deg, #0f1b35 0%, #1a2746 100%);
    color: #fff;
    padding: 80px 6%;
}

.pm-platform-tabs {
    display: flex;
    justify-content: center;
    gap: 16px;
    margin-bottom: 50px;
}

.pm-platform-tabs span {
    font-size: 14px;
    color: rgba(255, 255, 255, 0.65);
    padding: 8px 18px;
    border-radius: 20px;
    border: 1px solid rgba(255, 255, 255, 0.15);
    cursor: pointer;
    transition: all 0.3s ease;
}

.pm-platform-tabs span.active,
.pm-platform-tabs span:hover {
    color: #fff;
    background: var(--accent-color);
    border-color: var(--accent-color);
}

.pm-platform-list {
    max-width: 1100px;
    margin: 0 auto;
    display: flex;
    flex-direction: column;
    gap: 40px;
}

.pm-platform-item {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 50px;
    align-items: center;
}

.pm-platform-item.reverse .pm-platform-img {
    order: 2;
}

.pm-platform-item.reverse .pm-platform-text {
    order: 1;
    text-align: right;
}

.pm-platform-img {
    border-radius: 12px;
    overflow: hidden;
    box-shadow: 0 16px 40px rgba(0, 0, 0, 0.25);
}

.pm-platform-img img {
    width: 100%;
    height: 280px;
    object-fit: cover;
    display: block;
    transition: transform 0.5s ease;
}

.pm-platform-item:hover .pm-platform-img img {
    transform: scale(1.04);
}

.pm-platform-text h3 {
    font-size: 22px;
    font-weight: 700;
    margin-bottom: 14px;
    color: #fff;
}

.pm-platform-text p {
    font-size: 15px;
    color: rgba(255, 255, 255, 0.78);
    line-height: 1.75;
}

/* ============================================================
   4. 常见问题解答
============================================================ */
.pm-faq {
    background: #141821;
    color: #fff;
    padding: 80px 6%;
}

.pm-faq-list {
    max-width: 860px;
    margin: 0 auto;
    display: flex;
    flex-direction: column;
    gap: 16px;
}

.pm-faq-item {
    background: #fff;
    color: #1a1a1a;
    border-radius: 10px;
    overflow: hidden;
}

.pm-faq-item summary {
    list-style: none;
    padding: 22px 26px;
    font-size: 17px;
    font-weight: 600;
    cursor: pointer;
    display: flex;
    justify-content: space-between;
    align-items: center;
    transition: color 0.3s ease;
}

.pm-faq-item summary::-webkit-details-marker {
    display: none;
}

.pm-faq-item summary::after {
    content: "\276F";
    font-size: 14px;
    color: #999;
    transition: transform 0.3s ease;
}

.pm-faq-item[open] summary::after {
    transform: rotate(90deg);
    color: var(--primary-color);
}

.pm-faq-content {
    padding: 0 26px 22px;
    font-size: 14px;
    color: #555;
    line-height: 1.75;
}

/* ============================================================
   5. 滚动渐入动画
============================================================ */
.pm-reveal {
    opacity: 0;
    transform: translateY(26px);
    transition: opacity 0.65s ease, transform 0.65s ease;
}

.pm-reveal.revealed {
    opacity: 1;
    transform: translateY(0);
}

.pm-process-grid .pm-process-card:nth-child(1) { transition-delay: 0s; }
.pm-process-grid .pm-process-card:nth-child(2) { transition-delay: 0.08s; }
.pm-process-grid .pm-process-card:nth-child(3) { transition-delay: 0.16s; }
.pm-process-grid .pm-process-card:nth-child(4) { transition-delay: 0.24s; }

.pm-platform-list .pm-platform-item:nth-child(1) { transition-delay: 0s; }
.pm-platform-list .pm-platform-item:nth-child(2) { transition-delay: 0.08s; }
.pm-platform-list .pm-platform-item:nth-child(3) { transition-delay: 0.16s; }
.pm-platform-list .pm-platform-item:nth-child(4) { transition-delay: 0.24s; }
.pm-platform-list .pm-platform-item:nth-child(5) { transition-delay: 0.32s; }
.pm-platform-list .pm-platform-item:nth-child(6) { transition-delay: 0.40s; }

.pm-faq-list .pm-faq-item:nth-child(1) { transition-delay: 0s; }
.pm-faq-list .pm-faq-item:nth-child(2) { transition-delay: 0.1s; }
.pm-faq-list .pm-faq-item:nth-child(3) { transition-delay: 0.2s; }

/* 减少动画偏好 */
@media (prefers-reduced-motion: reduce) {
    .pm-reveal {
        opacity: 1;
        transform: none;
        transition: none;
    }
}

/* ============================================================
   6. 响应式适配
============================================================ */
@media (max-width: 1200px) {
    .pm-process-grid {
        grid-template-columns: repeat(2, 1fr);
    }
}

@media (max-width: 992px) {
    .pm-platform-item {
        grid-template-columns: 1fr;
        gap: 24px;
    }

    .pm-platform-item.reverse .pm-platform-img,
    .pm-platform-item.reverse .pm-platform-text {
        order: unset;
        text-align: left;
    }

    .pm-platform-img img {
        height: 220px;
    }
}

@media (max-width: 576px) {
    .pm-process-grid {
        grid-template-columns: 1fr;
    }

    .pm-section-head h2 {
        font-size: 26px;
    }

    .pm-platform-tabs {
        flex-wrap: wrap;
    }
}