/* feed.css — 移动端竖向滑动卡片流 */
html,body.feed-body{height:100%;overflow:hidden;overscroll-behavior:none}
body.feed-body{background:#07070A}
/* 顶部悬浮层 */
.feed-top{
position:fixed;top:0;left:0;right:0;z-index:40;display:flex;align-items:center;gap:10px;
padding:calc(env(safe-area-inset-top,0px) + 12px) 16px 12px;
background:linear-gradient(180deg,rgba(7,7,10,.86),rgba(7,7,10,0));
pointer-events:none;
}
.feed-top .brand{pointer-events:auto;transform:scale(.92);transform-origin:left center}
.feed-top-right{margin-left:auto;display:flex;gap:8px;pointer-events:auto}
.icon-btn{
width:36px;height:36px;border-radius:50%;border:1px solid rgba(255,255,255,.14);
background:rgba(255,255,255,.07);backdrop-filter:blur(12px);color:#fff;
display:grid;place-items:center;font-size:14px;cursor:pointer;
}
.icon-btn:active{transform:scale(.94)}
.icon-btn.off{opacity:.4}
.icon-btn.off::after{content:'';position:absolute;width:22px;height:1.5px;background:currentColor;transform:rotate(-45deg);border-radius:2px}
.icon-btn{position:relative}
/* 进度条 */
.feed-progress{
position:fixed;top:0;left:0;right:0;height:2px;background:rgba(255,255,255,.08);z-index:45;
}
.feed-progress i{display:block;height:100%;width:0;background:var(--accent);transition:width .18s linear}
/* 滑动容器 */
.feed{
height:100dvh;overflow-y:scroll;scroll-snap-type:y mandatory;
-webkit-overflow-scrolling:touch;scrollbar-width:none;
}
.feed::-webkit-scrollbar{display:none}
.card{
position:relative;height:100dvh;scroll-snap-align:start;scroll-snap-stop:always;
display:flex;flex-direction:column;overflow:hidden;
padding:calc(env(safe-area-inset-top,0px) + 74px) 20px calc(env(safe-area-inset-bottom,0px) + 72px);
}
.card::before{
content:"";position:absolute;inset:-20% -30% auto;height:70%;z-index:0;
background:radial-gradient(ellipse at 50% 0%,var(--glow,rgba(124,135,148,.20)),transparent 68%);
filter:blur(6px);
}
.card-inner{position:relative;z-index:1;display:flex;flex-direction:column;height:100%;min-height:0}
/* 卡片顶部 */
.card-tags{display:flex;align-items:center;gap:8px;margin-bottom:auto}
.tag{
font-size:10.5px;letter-spacing:.16em;text-transform:uppercase;font-weight:650;
padding:5px 10px;border-radius:999px;color:var(--c,#fff);
background:color-mix(in srgb,var(--c,#fff) 14%,transparent);
border:1px solid color-mix(in srgb,var(--c,#fff) 34%,transparent);
}
.tag.plain{color:var(--muted);background:rgba(255,255,255,.05);border-color:rgba(255,255,255,.1)}
/* 主视觉 */
.card-main{margin:auto 0;padding-right:64px}
.card-hanzi{
font-family:var(--serif);font-weight:800;letter-spacing:.02em;line-height:1;
font-size:clamp(64px,21vw,132px);color:#fff;
text-shadow:0 0 60px var(--glow,rgba(255,255,255,.14));
word-break:break-word;
}
.card-hanzi.lesson{font-size:clamp(30px,8.6vw,46px);line-height:1.22;font-weight:700;letter-spacing:0}
.card-pinyin{
font-family:var(--mono);font-size:16px;color:rgba(255,255,255,.62);
letter-spacing:.06em;margin-top:14px;
}
.card-eq{
font-size:17px;color:#fff;line-height:1.5;margin-top:14px;font-weight:520;
max-width:24em;
}
.card-tone{
font-size:14px;color:rgba(255,255,255,.56);line-height:1.65;margin-top:12px;max-width:26em;
}
.card-ex{
margin-top:18px;padding:12px 14px;border-radius:14px;
background:rgba(255,255,255,.05);border-left:2px solid var(--accent-soft);
}
.card-ex q{font-family:var(--serif);font-size:19px;color:#fff;quotes:none;display:block;line-height:1.5}
.card-ex span{display:block;font-size:13px;color:rgba(255,255,255,.5);margin-top:4px}
.card-points{list-style:none;display:flex;flex-direction:column;gap:10px;margin-top:18px}
.card-points li{font-size:14.5px;line-height:1.65;color:rgba(255,255,255,.72);padding-left:16px;position:relative}
.card-points li::before{content:"";position:absolute;left:0;top:.62em;width:5px;height:5px;border-radius:50%;background:var(--info)}
/* 严重度刻度 */
.card-scale{display:flex;gap:4px;align-items:center;margin-top:16px}
.card-scale i{width:22px;height:3px;border-radius:2px;background:rgba(255,255,255,.14)}
.card-scale i.on{background:var(--c,#fff)}
/* 右侧竖排操作 */
.rail{
position:absolute;right:14px;bottom:calc(env(safe-area-inset-bottom,0px) + 110px);
display:flex;flex-direction:column;gap:16px;z-index:2;
}
.rail button{
display:flex;flex-direction:column;align-items:center;gap:4px;
background:none;border:none;color:rgba(255,255,255,.72);font-size:10px;
letter-spacing:.02em;cursor:pointer;padding:0;width:46px;
}
.rail .rb{
width:44px;height:44px;border-radius:50%;display:grid;place-items:center;
background:rgba(255,255,255,.09);border:1px solid rgba(255,255,255,.13);
backdrop-filter:blur(10px);font-size:17px;transition:.15s;
}
.rail button:active .rb{transform:scale(.9);background:rgba(255,255,255,.18)}
.rail button.on .rb{background:var(--accent);border-color:var(--accent);color:#fff}
/* 底部提示 */
.swipe-hint{
position:absolute;left:50%;bottom:calc(env(safe-area-inset-bottom,0px) + 150px);
transform:translateX(-50%);display:flex;flex-direction:column;align-items:center;gap:6px;
font-size:11.5px;color:rgba(255,255,255,.5);letter-spacing:.12em;pointer-events:none;
animation:floaty 2.2s ease-in-out infinite;
}
.swipe-hint svg{opacity:.7}
@keyframes floaty{0%,100%{transform:translateX(-50%) translateY(0)}50%{transform:translateX(-50%) translateY(-7px)}}
/* 底部标签栏 */
.tabbar{
position:fixed;left:0;right:0;bottom:0;z-index:40;display:flex;justify-content:space-around;
padding:8px 0 calc(env(safe-area-inset-bottom,0px) + 8px);
background:linear-gradient(0deg,rgba(7,7,10,.96),rgba(7,7,10,.5));
border-top:1px solid rgba(255,255,255,.06);backdrop-filter:blur(16px);
}
.tabbar a{
display:flex;flex-direction:column;align-items:center;gap:3px;
font-size:10px;color:rgba(255,255,255,.45);padding:4px 16px;
}
.tabbar a.on{color:#fff}
.tabbar a svg{width:21px;height:21px}
/* 详情抽屉 */
.sheet-mask{
position:fixed;inset:0;z-index:70;background:rgba(0,0,0,.6);backdrop-filter:blur(3px);
opacity:0;pointer-events:none;transition:.24s;
}
.sheet-mask.on{opacity:1;pointer-events:auto}
.sheet{
position:fixed;left:0;right:0;bottom:0;z-index:71;max-height:82dvh;
background:#121216;border-radius:22px 22px 0 0;border-top:1px solid rgba(255,255,255,.1);
transform:translateY(102%);transition:transform .3s cubic-bezier(.2,.8,.2,1);
display:flex;flex-direction:column;
}
.sheet.on{transform:translateY(0)}
.sheet-grab{width:38px;height:4px;border-radius:99px;background:rgba(255,255,255,.22);margin:10px auto 4px}
.sheet-head{display:flex;align-items:center;justify-content:space-between;padding:8px 20px 14px}
.sheet-head b{font-size:15px}
.sheet-close{background:none;border:none;color:var(--muted);font-size:20px;cursor:pointer;line-height:1}
.sheet-body{overflow-y:auto;padding:0 20px calc(env(safe-area-inset-bottom,0px) + 26px);-webkit-overflow-scrolling:touch}
.sheet-sec{padding:14px 0;border-top:1px solid rgba(255,255,255,.06)}
.sheet-sec:first-child{border-top:none}
.sheet-sec h4{font-size:10.5px;letter-spacing:.16em;text-transform:uppercase;color:var(--muted);margin-bottom:8px;font-weight:650}
.sheet-sec p{font-size:14.5px;line-height:1.72;color:rgba(255,255,255,.76)}
.sheet-sec.danger{background:rgba(255,65,40,.06);border-radius:12px;padding:14px;margin:10px 0;border-top:none}
.sheet-sec .chip{margin:3px 4px 0 0}
.sheet-ex q{font-family:var(--serif);font-size:17px;display:block;line-height:1.5}
.sheet-ex span{font-size:12.5px;color:var(--muted);display:block;margin-top:3px}
.sheet-ex{margin-bottom:12px}
.sheet-cta{display:block;text-align:center;padding:13px;border-radius:999px;background:var(--surface-2);border:1px solid var(--line);font-size:14px;margin-top:8px}
/* 空态 */
.feed-empty{height:100dvh;display:grid;place-items:center;text-align:center;padding:32px;color:var(--muted)}
@media (min-width:900px){
.card{padding-left:max(24px,calc(50vw - 320px));padding-right:max(24px,calc(50vw - 320px))}
.rail{right:max(20px,calc(50vw - 380px))}
.card-hanzi{font-size:clamp(80px,11vw,150px)}
}
/* ---- 图标 ---- */
.rail .rb svg{width:20px;height:20px}
.rail button.on .rb svg{stroke-width:2}
.swipe-hint svg{width:20px;height:20px}
.tabbar a svg{width:21px;height:21px}
/* 自动播放被浏览器拦下时的一键开启提示 */
.sound-hint{
position:fixed;left:50%;bottom:calc(env(safe-area-inset-bottom,0px) + 78px);transform:translateX(-50%) translateY(8px);
z-index:60;display:inline-flex;align-items:center;gap:8px;padding:10px 16px;border-radius:999px;
border:1px solid rgba(255,255,255,.18);background:rgba(20,20,24,.94);backdrop-filter:blur(14px);
color:#fff;font-size:13px;cursor:pointer;opacity:0;transition:opacity .2s,transform .2s;
box-shadow:0 8px 30px rgba(0,0,0,.45);white-space:nowrap;
}
.sound-hint.on{opacity:1;transform:translateX(-50%) translateY(0)}
.sound-hint .ico svg{width:16px;height:16px;display:block}
/* 首屏发音引导（iOS 必须先有一次点击才允许播放） */
.audio-gate{
position:fixed;inset:0;z-index:120;display:grid;place-items:center;padding:22px;
background:rgba(6,6,9,.86);backdrop-filter:blur(14px);
padding-top:calc(env(safe-area-inset-top,0px) + 22px);
padding-bottom:calc(env(safe-area-inset-bottom,0px) + 22px);
}
.audio-gate[hidden]{display:none!important}
body.gate-lock{overflow:hidden}
body.gate-lock .feed{overflow:hidden;touch-action:none}
.audio-gate-box{
width:100%;max-width:340px;text-align:center;padding:26px 22px;border-radius:20px;
background:linear-gradient(180deg,rgba(255,255,255,.07),rgba(255,255,255,.02));
border:1px solid rgba(255,255,255,.12);box-shadow:0 24px 70px rgba(0,0,0,.6);
}
.ag-ico{
width:58px;height:58px;margin:0 auto 14px;border-radius:50%;display:grid;place-items:center;
color:#fff;background:radial-gradient(circle at 50% 40%,rgba(255,59,48,.9),rgba(212,25,75,.7));
box-shadow:0 8px 26px rgba(255,59,48,.35);
}
.audio-gate h2{font-family:var(--serif);font-size:21px;margin-bottom:8px;color:#fff}
.audio-gate p{font-size:13.5px;line-height:1.7;color:var(--muted);margin-bottom:18px}
.ag-btn{
width:100%;padding:14px;border-radius:12px;border:0;cursor:pointer;
background:linear-gradient(135deg,#FF4128,#D4194B);color:#fff;font-size:15px;font-weight:650;
box-shadow:0 10px 26px rgba(255,59,48,.32);
}
.ag-btn:active{transform:scale(.98)}
.ag-skip{
margin-top:12px;background:none;border:0;color:var(--muted);font-size:12.5px;
text-decoration:underline;cursor:pointer;padding:6px;
}
.ag-note{margin-top:14px;font-size:11px;color:rgba(255,255,255,.32);margin-bottom:0!important}