/* =========================================================
   产品演示页 /demo
   ---------------------------------------------------------
   图片位统一使用 .demo-shot 结构：
   把 .demo-shot-media 里的 .demo-shot-placeholder 整块删除，
   替换为 <img src="/static/official/demo/xxx.png" alt="界面说明">
   放入 <img> 后容器会自动贴合图片比例（不留空白、不裁切）。
   ========================================================= */

/* ---------- 页面基础 ---------- */
.demo-page {
    --demo-text: #f5f3ff;
    --demo-muted: #b9b7cf;
    --demo-line: rgba(170,163,218,.2);
    --demo-stripe: rgba(255,255,255,.035);
    color: var(--demo-text);
}

[data-theme="light"] .demo-page {
    --demo-text: #20253d;
    --demo-muted: #5d657a;
    --demo-line: #dce1eb;
    --demo-stripe: rgba(0,0,0,.028);
}

.demo-wrap { max-width: 1160px; margin: auto; padding: 0 28px; }
.demo-section { padding: 48px 0; scroll-margin-top: 100px; }
.demo-heading { margin-bottom: 28px; max-width: 760px; }
.demo-kicker { color: var(--brand-blue); font-size: 13px; font-weight: 600; letter-spacing: .1em; margin-bottom: 16px; }
.demo-heading h2 { font-size: clamp(23px,3vw,32px); line-height: 1.4; margin-bottom: 14px; }
.demo-heading > p:last-child { color: var(--demo-muted); }
.demo-final h3 { font-size: clamp(20px,2.4vw,26px); line-height: 1.4; margin-bottom: 10px; }
.demo-final p { color: var(--demo-muted); }

/* ---------- Hero ---------- */
.demo-hero { padding: 80px 0 48px; }
.demo-hero-inner { max-width: 720px; }
.demo-hero h1 { font-size: clamp(32px,4.2vw,50px); line-height: 1.35; letter-spacing: -.03em; }
.demo-hero h1 em { font-style: normal; color: #9eafff; }

[data-theme="light"] .demo-hero h1 em { color: #5755c9; }

.demo-lead { color: var(--demo-muted); font-size: 16px; line-height: 1.9; margin: 24px 0; max-width: 620px; }
.demo-actions { display: flex; flex-wrap: wrap; gap: 12px; }
.demo-tags { display: flex; flex-wrap: wrap; gap: 8px; list-style: none; margin-top: 26px; }
.demo-tags li { font-size: 12px; padding: 5px 12px; border: 1px solid var(--demo-line); border-radius: 8px; color: var(--demo-muted); }
.demo-hero .demo-shot { margin-top: 44px; }

/* Hero 图片位并排：左侧 PC 端横图（原图 2:1）+ 右侧手机端竖屏预览。
   220px 是按「两块高度接近」配出来的（1104px 版面下都约 430px 高），
   手机端换图后若比例变化，改这一个数值即可 */
.demo-shot-pair { display: grid; grid-template-columns: minmax(0,1fr) minmax(0,220px); gap: 24px; align-items: center; }

/* ---------- 通用图片位 ---------- */
.demo-shot { margin: 0; min-width: 0; }
.demo-shot-media {
    position: relative;
    overflow: hidden;
    border-radius: 20px;
    border: 1px solid var(--demo-line);
    background: var(--bg-card);
    box-shadow: 0 18px 44px rgba(0,0,0,.16);
}

/* 占位状态：用固定比例撑出高度，保证版面不跳动 */
.demo-shot-media--hero { aspect-ratio: 16 / 9; }
.demo-shot-media--wide { aspect-ratio: 16 / 10; }
.demo-shot-media--web { aspect-ratio: 16 / 10.5; } /* 预留给电脑版下单页（V4） */
.demo-shot-media--phone { aspect-ratio: 9 / 19.2; border-radius: 26px; }

/* 真实图片：宽度铺满，高度按图片自身比例 */
.demo-shot-media > img { display: block; width: 100%; height: 100%; object-fit: contain; }

/* 已经放入真实图片的图片位，取消固定比例，让容器高度跟着图片走：
   图片比例与占位比例不一致时不再出现上下（左右）空白，也不会被裁切 */
.demo-shot-media:has(> img) { aspect-ratio: auto; }
.demo-shot-media:has(> img) > img { height: auto; }

/* 占位块：加入真实图片后整体删除即可 */
.demo-shot-placeholder {
    position: absolute;
    inset: 0;
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    gap: 8px;
    padding: 22px;
    text-align: center;
    color: var(--demo-muted);
    background: repeating-linear-gradient(135deg, transparent 0 14px, var(--demo-stripe) 14px 28px);
}

.demo-shot-placeholder::after {
    content: '';
    position: absolute;
    inset: 9px;
    border: 1.5px dashed var(--demo-line);
    border-radius: 13px;
    pointer-events: none;
}

.demo-shot-ico {
    width: 32px;
    height: 32px;
    flex-shrink: 0;
    fill: none;
    stroke: currentColor;
    stroke-width: 1.6;
    stroke-linecap: round;
    stroke-linejoin: round;
    opacity: .8;
}

.demo-shot-placeholder strong { font-size: 13px; font-weight: 600; color: var(--demo-text); }
.demo-shot-placeholder span { font-size: 11.5px; letter-spacing: .02em; }
.demo-shot figcaption { margin-top: 14px; font-size: 13px; line-height: 1.8; color: var(--demo-muted); }
.demo-shot figcaption b { display: block; font-size: 15px; color: var(--demo-text); margin-bottom: 5px; }

/* ---------- 终端展示 ---------- */
/* 网页 / 小程序 / APP 是同一套界面，只放一张手机端截图：左侧说明 + 右侧竖屏框
   （电脑版 V4 加入后，这里再加一列横图） */
.demo-terminals { display: grid; grid-template-columns: minmax(0,1fr) minmax(0,320px); gap: 48px; align-items: center; }
.demo-terminal { min-width: 0; }
.demo-terminal h3 { font-size: 20px; margin-bottom: 8px; }
.demo-terminal > p { color: var(--demo-muted); font-size: 14px; line-height: 1.9; }

/* ---------- 操作流程 ---------- */
/* 图片位是手机端竖屏截图：图片列固定窄栏放竖屏框，文案列吃剩余宽度 */
.demo-flow-item {
    display: grid;
    grid-template-columns: minmax(0,1fr) minmax(0,320px);
    gap: 44px;
    align-items: center;
    padding: 40px 0;
    border-top: 1px solid var(--demo-line);
}

.demo-flow-item:first-child { border-top: 0; padding-top: 0; }
.demo-flow-item.is-reversed { grid-template-columns: minmax(0,320px) minmax(0,1fr); }
.demo-flow-item.is-reversed .demo-flow-copy { order: 2; }
.demo-step { display: inline-block; color: var(--brand-blue); font-size: 26px; font-weight: 650; letter-spacing: -.02em; margin-bottom: 12px; }
.demo-flow-copy h3 { font-size: 22px; margin-bottom: 12px; }
.demo-flow-copy > p { color: var(--demo-muted); font-size: 14px; line-height: 1.9; }
.demo-flow-copy ul { list-style: none; margin-top: 20px; }
.demo-flow-copy li { position: relative; padding: 8px 0 8px 20px; font-size: 14px; }

.demo-flow-copy li::before {
    content: '';
    position: absolute;
    left: 0;
    top: 16px;
    width: 6px;
    height: 6px;
    border-radius: 50%;
    background: var(--brand-blue);
}

/* ---------- 后台模块画廊 ---------- */
.demo-modules { display: grid; grid-template-columns: repeat(3,minmax(0,1fr)); gap: 26px 20px; }

/* ---------- 底部 CTA ---------- */
.demo-final {
    display: flex;
    justify-content: space-between;
    align-items: center;
    gap: 30px;
    padding: 38px;
    margin: 32px 0 64px;
    border-radius: 22px;
    background: var(--bg-card);
    border: 1px solid var(--demo-line);
}

.demo-final .btn { flex-shrink: 0; }

/* ---------- 可访问性 ---------- */
.demo-page a:focus-visible, .demo-page button:focus-visible, .demo-page summary:focus-visible { outline: 2px solid var(--brand-blue); outline-offset: 5px; }

/* ---------- 响应式 ---------- */
@media (max-width: 1000px) {
    /* Hero 两张图改为上下排列：并排时 PC 端横图会被压到 500px 以下，看不清 */
    .demo-shot-pair { grid-template-columns: minmax(0,1fr); gap: 20px; }
    .demo-shot-pair .demo-shot-media--phone { max-width: 300px; margin-inline: auto; }
    .demo-flow-item { gap: 30px; }
    .demo-modules { grid-template-columns: repeat(2,minmax(0,1fr)); }
}

@media (max-width: 768px) {
    .demo-wrap { padding: 0 22px; }
    .demo-hero { padding: 40px 0 24px; }
    .demo-hero h1 { font-size: clamp(27px,7.5vw,38px); }
    .demo-lead { font-size: 14px; margin: 18px 0; }
    .demo-actions .btn { padding: 12px 16px; font-size: 13px; }
    .demo-hero .demo-shot { margin-top: 30px; }
    .demo-section { padding: 32px 0; }
    .demo-shot-media { border-radius: 16px; }
    .demo-shot-media--phone { border-radius: 20px; }
    .demo-terminal h3 { font-size: 18px; }
    .demo-terminals { grid-template-columns: minmax(0,1fr); gap: 26px; }
    .demo-flow-item, .demo-flow-item.is-reversed { grid-template-columns: minmax(0,1fr); gap: 22px; padding: 28px 0; }
    .demo-flow-item.is-reversed .demo-flow-copy { order: 0; }
    .demo-flow-item .demo-shot, .demo-terminals .demo-shot { max-width: 300px; margin-inline: auto; }
    .demo-step { font-size: 22px; }
    .demo-flow-copy h3 { font-size: 19px; }
    .demo-modules { grid-template-columns: minmax(0,1fr); gap: 24px; }
    .demo-final { flex-direction: column; align-items: stretch; padding: 24px; margin-bottom: 40px; }
    .demo-final .btn { justify-content: center; }
}