/* 文渊 AI · 移动端 — design tokens shared with the desktop app */
:root{
  --bg:#EDEAE3; --surface:#F5F3EF; --card:#fff; --line:#E8E4DD;
  --ink:#1F1E1C; --ink2:#5a5852; --mute:#97938b; --faint:#b6b1a8;
  --dark:#1C1B19; --accent:#B23B34; --accent-soft:#FBEEEC;
  --safe-b:env(safe-area-inset-bottom,0px); --safe-t:env(safe-area-inset-top,0px);
}
*{box-sizing:border-box;margin:0;padding:0;-webkit-tap-highlight-color:transparent}
html,body{height:100%}
body{font-family:"Noto Sans SC",system-ui,-apple-system,sans-serif;color:var(--ink);background:var(--bg);
  -webkit-font-smoothing:antialiased;overscroll-behavior-y:none}
.serif{font-family:"Noto Serif SC",serif}
.mono{font-family:"JetBrains Mono",monospace}
button,input,textarea{font-family:inherit;font-size:inherit;color:inherit}
#app{display:flex;flex-direction:column;height:100dvh;overflow:hidden}

/* ---------- chrome ---------- */
.topbar{flex:0 0 auto;padding-top:var(--safe-t);background:rgba(245,243,239,.94);backdrop-filter:blur(10px);
  border-bottom:1px solid var(--line);display:flex;align-items:center;gap:10px;padding-left:14px;padding-right:14px;height:calc(52px + var(--safe-t))}
.topbar .t{font-size:17px;font-weight:700;flex:1;min-width:0;overflow:hidden;text-overflow:ellipsis;white-space:nowrap}
.iconbtn{width:34px;height:34px;flex:0 0 34px;border-radius:10px;display:flex;align-items:center;justify-content:center;
  color:var(--ink2);background:transparent;border:none;cursor:pointer}
.iconbtn:active{background:#EAE6DE}
.body{flex:1;overflow-y:auto;-webkit-overflow-scrolling:touch;overscroll-behavior:contain}
.pad{padding:16px}

/* ---------- tab bar ---------- */
.tabbar{flex:0 0 auto;display:flex;background:rgba(255,255,255,.96);backdrop-filter:blur(10px);
  border-top:1px solid var(--line);padding-bottom:var(--safe-b)}
.tab{flex:1;display:flex;flex-direction:column;align-items:center;gap:3px;padding:9px 0 7px;
  font-size:10.5px;color:var(--mute);cursor:pointer;background:none;border:none}
.tab.on{color:var(--accent)}
.tab svg{width:22px;height:22px}

/* ---------- generic ---------- */
.card{background:var(--card);border:1px solid var(--line);border-radius:14px}
.row{display:flex;align-items:center;gap:12px}
.btn{display:flex;align-items:center;justify-content:center;gap:6px;background:var(--accent);color:#fff;
  border:none;border-radius:12px;padding:13px 18px;font-size:15px;font-weight:500;cursor:pointer;width:100%}
.btn:active{background:#9d332d}
.btn.ghost{background:var(--card);color:var(--ink);border:1px solid var(--line)}
.btn.ghost:active{background:var(--surface)}
.chip{padding:7px 14px;border-radius:20px;font-size:13px;background:var(--card);border:1px solid var(--line);
  color:var(--ink2);cursor:pointer;white-space:nowrap}
.chip.on{background:var(--dark);color:var(--surface);border-color:var(--dark)}
.tag{font-size:11px;padding:3px 9px;border-radius:7px;font-weight:500;white-space:nowrap}
.muted{color:var(--mute);font-size:12.5px}
.empty{text-align:center;color:var(--faint);padding:70px 20px;font-size:14px}
.hr{height:1px;background:var(--line);margin:0}

/* ---------- toast / sheet ---------- */
#toast{position:fixed;left:50%;bottom:calc(84px + var(--safe-b));transform:translateX(-50%) translateY(14px);
  background:rgba(28,27,25,.94);color:#F5F3EF;padding:11px 18px;border-radius:12px;font-size:13.5px;
  max-width:86vw;text-align:center;opacity:0;pointer-events:none;transition:.24s;z-index:900;line-height:1.5}
#toast.show{opacity:1;transform:translateX(-50%) translateY(0)}
.mask{position:fixed;inset:0;background:rgba(28,27,25,.45);z-index:800;display:flex;align-items:flex-end;
  animation:fade .18s ease}
.sheet{width:100%;background:var(--card);border-radius:20px 20px 0 0;padding:18px 16px calc(18px + var(--safe-b));
  max-height:82dvh;overflow-y:auto;animation:up .24s cubic-bezier(.2,.9,.3,1)}
.sheet h3{font-size:16px;font-weight:700;margin-bottom:4px}
.grab{width:38px;height:4px;border-radius:3px;background:#ddd8cf;margin:0 auto 14px}
@keyframes up{from{transform:translateY(100%)}to{transform:none}}
@keyframes fade{from{opacity:0}to{opacity:1}}
.fade-in{animation:fi .3s ease}
@keyframes fi{from{opacity:0;transform:translateY(7px)}to{opacity:1;transform:none}}
/* 智能体思考中的转圈 */
.spinner{width:18px;height:18px;border:2px solid rgba(178,59,52,.25);border-top-color:var(--accent);
  border-radius:50%;animation:spin .7s linear infinite;display:inline-block;flex:0 0 auto}
@keyframes spin{to{transform:rotate(360deg)}}

/* ---------- editors ---------- */
.editor{flex:1;display:flex;flex-direction:column;min-height:0;background:#e8e4db}
.toolstrip{flex:0 0 auto;display:flex;gap:6px;overflow-x:auto;padding:9px 12px;background:#fff;
  border-bottom:1px solid var(--line);scrollbar-width:none}
.toolstrip::-webkit-scrollbar{display:none}
.tool{display:flex;align-items:center;gap:5px;padding:7px 11px;border-radius:9px;font-size:12.5px;
  color:var(--ink2);background:var(--surface);white-space:nowrap;cursor:pointer;border:none}
.tool.on{background:var(--accent-soft);color:var(--accent)}
.tool svg{width:15px;height:15px}
.actionbar{flex:0 0 auto;display:flex;gap:10px;padding:10px 14px calc(10px + var(--safe-b));
  background:#fff;border-top:1px solid var(--line)}
.stage{flex:1;overflow:auto;display:flex;justify-content:center;padding:14px}

/* PDF */
.pdfrail{flex:0 0 auto;display:flex;gap:8px;overflow-x:auto;padding:10px 12px;background:#fff;
  border-bottom:1px solid var(--line);scrollbar-width:none}
.pdfrail::-webkit-scrollbar{display:none}
.pdfthumb{position:relative;flex:0 0 54px;border-radius:6px;overflow:hidden;outline:1px solid var(--line);cursor:pointer}
.pdfthumb.on{outline:2px solid var(--accent)}
.pdfthumb img{width:100%;display:block}
.pdfthumb b{position:absolute;top:2px;left:3px;font-size:9px;background:rgba(0,0,0,.55);color:#fff;
  padding:0 4px;border-radius:5px;font-weight:400}
.pdfwrap{position:relative;flex:0 0 auto;align-self:flex-start;box-shadow:0 4px 20px rgba(60,50,40,.16);max-width:100%}
.pdfwrap img{display:block;background:#fff;max-width:100%}
.ov{position:absolute;z-index:2}
.ov.sel{outline:2px solid var(--accent);outline-offset:1px;z-index:5}
.ov .h{position:absolute;width:22px;height:22px;border-radius:50%;display:flex;align-items:center;
  justify-content:center;font-size:11px;z-index:6}
.ov .h.mv{top:-12px;left:-12px;background:#fff;border:2px solid var(--accent);color:var(--accent);cursor:move}
.ov .h.rm{top:-12px;right:-12px;background:var(--accent);color:#fff}
.ov .h.rs{right:-11px;bottom:-11px;width:18px;height:18px;background:#fff;border:2px solid var(--accent);border-radius:4px}
.spanbox{position:absolute;background:rgba(58,91,178,.13);outline:1px solid rgba(58,91,178,.45);cursor:text}
/* doc paper */
.paper{background:#fff;box-shadow:0 3px 18px rgba(60,50,40,.13);padding:30px 22px;width:100%;max-width:640px;
  font-family:"Noto Serif SC",serif}
[contenteditable]{outline:none}
[contenteditable]:focus{background:rgba(178,59,52,.05);border-radius:3px}
/* ppt */
.slide{width:100%;max-width:560px;aspect-ratio:16/9;position:relative;border-radius:8px;overflow:hidden;
  box-shadow:0 6px 24px rgba(60,50,40,.18);flex:0 0 auto}
.dots{display:flex;gap:6px;justify-content:center;padding:10px}
.dot{width:7px;height:7px;border-radius:50%;background:#d5cfc5}
.dot.on{background:var(--accent);width:18px;border-radius:4px}