/* ============================================================
   润扬科技官网原型 V2 样式（index-v2.html）
   道一云版式 + 润扬内容；占位图与交互样式集中于此
   品牌色：主蓝 #0F52BA / 强调橙 #FF7D00
   注：按钮类用 :where() 包裹保持零优先级，方便被 Tailwind 工具类覆盖
   ============================================================ */

html { scroll-behavior: smooth; }
body {
    /* 与官网一致：西文/数字 Inter（Google Fonts），中文回落苹方/雅黑 */
    font-family: "Inter", -apple-system, BlinkMacSystemFont, "Segoe UI", "PingFang SC",
        "Hiragino Sans GB", "Microsoft YaHei", sans-serif;
}

/* ===== 占位图样式 ===== */
:where(.ph) {
    background: repeating-linear-gradient(45deg, #e9f1fb, #e9f1fb 12px, #dfeafa 12px, #dfeafa 24px);
    border: 1px dashed #9dbce0;
    display: flex;
    align-items: center;
    justify-content: center;
    color: #5b83b5;
    font-size: 13px;
    letter-spacing: .05em;
}
:where(.ph-dark) {
    background: repeating-linear-gradient(45deg, #1c3a66, #1c3a66 14px, #23457a 14px, #23457a 28px);
    border: 0;
    display: flex;
    align-items: center;
    justify-content: center;
    color: #93b4e0;
    font-size: 13px;
    letter-spacing: .05em;
}

/* ===== 按钮（零优先级，可被工具类覆盖） ===== */
:where(.btn-do1) {
    background: #0F52BA;
    color: #fff;
    padding: .625rem 2rem;
    border-radius: .375rem;
    font-weight: 500;
    transition: all .3s;
}
:where(.btn-do1:hover) { background: #0C4398; }
:where(.btn-plain) {
    background: transparent;
    border: 1px solid #0F52BA;
    color: #0F52BA;
    padding: .625rem 2rem;
    border-radius: .375rem;
    font-weight: 500;
    transition: all .3s;
}
:where(.btn-plain:hover) { background: rgba(15, 82, 186, .06); }
:where(.btn-cta) {
    background: #FF7D00;
    color: #fff;
    padding: .625rem 2rem;
    border-radius: .375rem;
    font-weight: 500;
    transition: all .3s;
}
:where(.btn-cta:hover) { filter: brightness(1.1); }

/* ===== Banner 轮播（crossfade） ===== */
.banner-slide {
    opacity: 0;
    visibility: hidden;
    transition: opacity .8s ease, visibility .8s ease;
}
.banner-slide.active { opacity: 1; visibility: visible; }

/* ===== Mega 菜单 ===== */
.caret { transition: transform .25s ease; }
.mega-center { position: fixed; top: 64px; left: 50%; }

@media (min-width: 1024px) {
    .mega-panel {
        opacity: 0;
        visibility: hidden;
        transform: translate(-50%, 8px);
        transition: all .25s ease;
        pointer-events: none;
    }
    .mega-trigger:hover .mega-panel,
    .mega-panel:hover,
    .mega-trigger.open .mega-panel {
        opacity: 1;
        visibility: visible;
        transform: translate(-50%, 0);
        pointer-events: auto;
    }
    .mega-trigger:hover > a,
    .mega-trigger:hover > button { color: #0F52BA; }
    .mega-trigger:hover > a .caret,
    .mega-trigger:hover > button .caret { transform: rotate(180deg); }
}

/* ===== 解决方案 tab ===== */
.sol-tab { cursor: pointer; }
.sol-tab.active { color: #0F52BA; font-weight: 700; }
.sol-tab.active::after {
    content: '';
    display: block;
    height: 3px;
    border-radius: 2px;
    background: #0F52BA;
    margin-top: 6px;
}
.sol-panel { display: none; }
.sol-panel.active { display: block; }

/* ===== 案例库 tab ===== */
.case-tab { cursor: pointer; }
.case-tab.active { background: #0F52BA; color: #fff; border-color: #0F52BA; }

/* ===== 悬浮栏弹出层 =====
   垂直居中在此处处理（translate 里含 -50%），HTML 不再挂 -translate-y-1/2 */
.side-pop {
    opacity: 0;
    visibility: hidden;
    transform: translate(8px, -50%);
    transition: all .25s ease;
}
.side-item:hover .side-pop {
    opacity: 1;
    visibility: visible;
    transform: translate(0, -50%);
}

/* ===== 按钮旁「扫码咨询」：悬停在上方弹出二维码 ===== */
.qr-trigger { position: relative; cursor: pointer; user-select: none; }
.qr-pop {
    position: absolute;
    bottom: calc(100% + 10px);
    left: 50%;
    transform: translate(-50%, 4px);
    opacity: 0;
    visibility: hidden;
    transition: all .25s ease;
    z-index: 30;
}
.qr-trigger:hover .qr-pop {
    opacity: 1;
    visibility: visible;
    transform: translate(-50%, 0);
}
/* 弹层与按钮间空隙的悬停桥（防止移动鼠标时弹层消失） */
.qr-pop::before {
    content: '';
    position: absolute;
    left: 0;
    right: 0;
    bottom: -12px;
    height: 12px;
}
/* 底部小箭头 */
.qr-pop::after {
    content: '';
    position: absolute;
    top: 100%;
    left: 50%;
    margin-left: -5px;
    border: 5px solid transparent;
    border-top-color: #fff;
}

/* 首页 FAQ 折叠问答 */
details.hq-faq { border-bottom: 1px solid rgba(29, 41, 57, .08); }
details.hq-faq summary { list-style: none; cursor: pointer; position: relative;
    padding: 14px 28px 14px 0; font-weight: 500; color: #1D2939; }
details.hq-faq summary::-webkit-details-marker { display: none; }
details.hq-faq summary::after { content: '+'; position: absolute; right: 4px; top: 50%;
    transform: translateY(-50%); color: #FF7D00; font-weight: 700; font-size: 18px; }
details.hq-faq[open] summary::after { content: '\2212'; }
details.hq-faq[open] summary { color: #0F52BA; }
details.hq-faq p { padding: 0 0 14px; color: #475467; line-height: 1.8; }