/* ============================================================
   拍照识字 · OCR   ——  样式
   ============================================================ */

:root{
  --bg:#f5f6f8;
  --bg-elev:#ffffff;
  --bg-sunken:#eceef2;
  --text:#15181d;
  --text-2:#5c636e;
  --text-3:#8b929d;
  --line:#e2e5ea;
  --line-2:#d3d7de;
  --accent:#3b62f6;
  --accent-2:#6d4df6;
  --accent-soft:rgba(59,98,246,.10);
  --danger:#e0483d;
  --ok:#18a05c;
  --shadow-1:0 1px 2px rgba(16,20,30,.05), 0 6px 20px -10px rgba(16,20,30,.18);
  --shadow-2:0 20px 60px -20px rgba(16,20,30,.34);
  --radius:16px;
  --radius-s:11px;
  --stage-bg:#111318;
  --safe-b:env(safe-area-inset-bottom,0px);
  --safe-t:env(safe-area-inset-top,0px);
  --tabh:58px;
}

html[data-theme="dark"]{
  --bg:#0e1116;
  --bg-elev:#171b22;
  --bg-sunken:#0a0d11;
  --text:#e9edf3;
  --text-2:#9aa3b0;
  --text-3:#6d7683;
  --line:#252b34;
  --line-2:#313945;
  --accent:#6b8cff;
  --accent-2:#9d7bff;
  --accent-soft:rgba(107,140,255,.14);
  --danger:#ff6b60;
  --ok:#35c281;
  --shadow-1:0 1px 2px rgba(0,0,0,.4), 0 8px 24px -12px rgba(0,0,0,.7);
  --shadow-2:0 24px 70px -22px rgba(0,0,0,.8);
  --stage-bg:#05070a;
}

*{box-sizing:border-box;-webkit-tap-highlight-color:transparent;}
html,body{height:100%;}
body{
  margin:0;
  background:var(--bg);
  color:var(--text);
  font:400 16px/1.55 -apple-system,BlinkMacSystemFont,"Segoe UI","PingFang SC","HarmonyOS Sans SC","Hiragino Sans GB","Microsoft YaHei",system-ui,sans-serif;
  overscroll-behavior-y:none;
  -webkit-font-smoothing:antialiased;
  text-rendering:optimizeLegibility;
}
button,input,textarea{font:inherit;color:inherit;}
button{border:0;background:none;cursor:pointer;padding:0;}
.hidden{display:none !important;}
svg{width:100%;height:100%;display:block;}

/* ---------------- 布局 ---------------- */
.app{
  /* 必须是确定高度，不能只写 min-height：
     只写 min-height 时 .app 高度由内容决定，取景窗会被 video 的固有宽高比撑破视口，
     快门条被顶到屏幕外面，用户必须手指向上滑才看得到拍照按钮。 */
  height:100vh;
  height:var(--app-h,100dvh);
  display:flex;
  flex-direction:column;
  max-width:720px;
  margin:0 auto;
  position:relative;
  overflow:hidden;
}

.topbar{
  display:flex;align-items:center;justify-content:space-between;gap:12px;
  padding:calc(var(--safe-t) + 10px) 14px 10px;
  background:var(--bg);
  position:sticky;top:0;z-index:30;
}
.brand{display:flex;align-items:center;gap:10px;min-width:0;}
.logo{
  width:36px;height:36px;flex:0 0 36px;border-radius:11px;
  display:grid;place-items:center;color:#fff;padding:8px;
  background:linear-gradient(145deg,var(--accent),var(--accent-2));
  box-shadow:0 6px 16px -8px var(--accent);
}
.brand-txt{display:flex;flex-direction:column;min-width:0;}
.brand-txt strong{font-size:16.5px;letter-spacing:.2px;white-space:nowrap;overflow:hidden;text-overflow:ellipsis;}
.brand-txt small{font-size:11.5px;color:var(--text-3);margin-top:-1px;white-space:nowrap;overflow:hidden;text-overflow:ellipsis;}
.topbar-actions{display:flex;gap:6px;align-items:center;flex:0 0 auto;}

/* 顶部「安装到手机桌面」：字号/字重与左上角标题「拍照识字」完全一致 */
.topbtn{
  display:inline-flex;align-items:center;justify-content:center;
  height:38px;padding:0 11px;border-radius:11px;
  font-size:16.5px;font-weight:700;letter-spacing:.2px;
  color:var(--accent);background:var(--accent-soft);
  white-space:nowrap;transition:transform .12s, background .16s;
}
.topbtn:active{transform:scale(.95);}
.topbtn.done{color:var(--text-3);background:var(--bg-sunken);}

.main{flex:1;display:flex;flex-direction:column;min-height:0;padding:0 14px;}
.view{display:none;flex-direction:column;min-height:0;flex:1;}
.view.is-active{display:flex;}

.tabbar{
  display:flex;align-items:stretch;
  border-top:1px solid var(--line);
  background:color-mix(in srgb,var(--bg) 88%, transparent);
  backdrop-filter:saturate(180%) blur(18px);
  -webkit-backdrop-filter:saturate(180%) blur(18px);
  padding-bottom:var(--safe-b);
  position:sticky;bottom:0;z-index:30;
}
.tab{
  flex:1;display:flex;flex-direction:column;align-items:center;justify-content:center;gap:3px;
  height:var(--tabh);color:var(--text-3);font-size:11.5px;transition:color .16s;
}
.tab svg{width:23px;height:23px;}
.tab.is-active{color:var(--accent);}

/* ---------------- 通用按钮 ---------------- */
.iconbtn{
  width:38px;height:38px;border-radius:11px;display:grid;place-items:center;
  background:var(--bg-sunken);color:var(--text-2);transition:.16s;padding:9px;
}
.iconbtn:active{transform:scale(.94);}
.iconbtn.ghost{background:transparent;}
.iconbtn.ghost:hover{background:var(--bg-sunken);}
html[data-theme="dark"] .i-moon,.i-sun{display:none;}
html[data-theme="light"] .i-moon{display:none;}
html[data-theme="dark"] .i-sun{display:block;}

.btn{
  display:inline-flex;align-items:center;justify-content:center;gap:8px;
  height:46px;padding:0 16px;border-radius:13px;
  background:var(--bg-elev);color:var(--text);
  border:1px solid var(--line-2);
  font-size:15px;font-weight:500;
  box-shadow:var(--shadow-1);
  transition:transform .12s, background .16s;
  white-space:nowrap;
}
.btn svg{width:19px;height:19px;flex:0 0 19px;}
.btn:active{transform:scale(.97);}
.btn.primary{
  background:linear-gradient(145deg,var(--accent),var(--accent-2));
  color:#fff;border-color:transparent;
  box-shadow:0 10px 24px -12px var(--accent);
}
.btn.danger{color:var(--danger);border-color:color-mix(in srgb,var(--danger) 34%,transparent);}
.btn.small{height:38px;font-size:13.5px;padding:0 12px;border-radius:10px;}
.btn.small svg{width:16px;height:16px;flex-basis:16px;}
.btn.done,.btn:disabled{color:var(--text-3);background:var(--bg-sunken);box-shadow:none;}
.linkbtn{color:var(--accent);font-size:14px;font-weight:500;padding:6px 4px;}
.row{display:flex;gap:10px;}
.row.wrap{flex-wrap:wrap;}

/* ---------------- 拍照界面 ---------------- */
.stage{
  position:relative;flex:1;min-height:0;
  border-radius:var(--radius);overflow:hidden;
  background:var(--stage-bg);
  box-shadow:var(--shadow-1);
  isolation:isolate;
}
#video{
  /* 绝对定位脱离文档流：否则 video 的固有宽高比会参与 stage 的内容高度计算，
     把整个页面撑得比视口高（这是快门按钮被顶出屏幕的直接原因）。 */
  position:absolute;inset:0;
  width:100%;height:100%;object-fit:cover;display:block;
  background:var(--stage-bg);
}
.stage-overlay{
  position:absolute;inset:0;pointer-events:none;
  display:flex;flex-direction:column;align-items:center;justify-content:center;
  padding:18px;
  transition:opacity .2s;
}
.stage-overlay.hidden{display:none !important;}
.frame{
  width:min(86%,520px);aspect-ratio:1.42/1;position:relative;max-height:70%;
}
.frame i{
  position:absolute;width:30px;height:30px;
  border:2.5px solid rgba(255,255,255,.92);
  filter:drop-shadow(0 1px 4px rgba(0,0,0,.5));
}
.frame i:nth-child(1){top:0;left:0;border-right:0;border-bottom:0;border-radius:9px 0 0 0;}
.frame i:nth-child(2){top:0;right:0;border-left:0;border-bottom:0;border-radius:0 9px 0 0;}
.frame i:nth-child(3){bottom:0;left:0;border-right:0;border-top:0;border-radius:0 0 0 9px;}
.frame i:nth-child(4){bottom:0;right:0;border-left:0;border-top:0;border-radius:0 0 9px 0;}
.hint{
  margin:14px 0 0;font-size:12.5px;color:rgba(255,255,255,.86);
  background:rgba(0,0,0,.42);padding:6px 12px;border-radius:999px;
  backdrop-filter:blur(6px);text-align:center;
}

.stage-empty{
  position:absolute;inset:0;display:flex;flex-direction:column;
  align-items:center;justify-content:center;gap:10px;padding:26px;
  text-align:center;color:var(--text);
  background:var(--bg-elev);
}
.stage-empty svg{width:54px;height:54px;color:var(--text-3);margin-bottom:2px;}
.stage-empty h3{margin:0;font-size:16.5px;}
.stage-empty p{margin:0;font-size:13px;color:var(--text-2);max-width:30ch;line-height:1.6;}
.stage-empty .row{margin-top:8px;flex-wrap:wrap;justify-content:center;}
.stage-empty .cam-state{
  font-size:13px;color:var(--accent,#2f6fed);font-weight:500;min-height:0;
}
.stage-empty .cam-state:empty{display:none;}
.stage-empty .cam-note{font-size:12px;color:var(--text-3);}
.linkbtn{
  margin-top:2px;background:none;border:0;padding:6px 8px;
  font-size:12.5px;color:var(--text-3);text-decoration:underline;
  text-underline-offset:3px;cursor:pointer;font-family:inherit;
}
.linkbtn:active{opacity:.6;}

.chipbar{
  position:absolute;left:10px;right:10px;top:10px;
  display:flex;gap:8px;flex-wrap:wrap;pointer-events:none;
}
.chip{
  pointer-events:auto;
  display:inline-flex;align-items:center;gap:6px;
  height:32px;padding:0 11px;border-radius:999px;
  background:rgba(12,14,20,.55);color:#fff;
  font-size:12.5px;font-weight:500;
  border:1px solid rgba(255,255,255,.16);
  -webkit-backdrop-filter:blur(10px);
  backdrop-filter:blur(10px);
  transition:.16s;
}
.chip svg{width:15px;height:15px;flex:0 0 15px;}
.chip:active{transform:scale(.95);}
.chip.info{pointer-events:none;opacity:.72;font-weight:400;}
.chip.off{color:rgba(255,255,255,.62);}

.shutterbar{
  display:flex;align-items:center;justify-content:space-between;
  padding:16px 22px 18px;
}
.sidebtn{
  width:62px;display:flex;flex-direction:column;align-items:center;gap:4px;
  color:var(--text-2);font-size:11px;padding:6px 0;border-radius:12px;transition:.16s;
}
.sidebtn svg{width:23px;height:23px;}
.sidebtn:active{transform:scale(.94);color:var(--accent);}
.sidebtn[disabled]{opacity:.34;pointer-events:none;}
.sidebtn.on{color:var(--accent);}

.shutter{
  width:74px;height:74px;border-radius:50%;
  border:3.5px solid var(--text);
  display:grid;place-items:center;transition:transform .12s;
  position:relative;
}
.shutter span{
  width:56px;height:56px;border-radius:50%;display:block;
  background:linear-gradient(145deg,var(--accent),var(--accent-2));
  transition:transform .12s;
}
.shutter:active{transform:scale(.94);}
.shutter:active span{transform:scale(.9);}
/* 相机没就绪：变灰但依然可点。点了必须有反馈，绝不静默。 */
.shutter.is-off{border-color:var(--text-3);}
.shutter.is-off span{background:var(--text-3);opacity:.55;}

/* 快门白闪 */
.stage::after{
  content:"";position:absolute;inset:0;background:#fff;opacity:0;pointer-events:none;
  transition:opacity .18s ease;z-index:5;
}
.stage.flash::after{opacity:.72;transition:none;}

/* ---------------- 结果界面 ---------------- */
.resultbar{
  display:flex;align-items:center;gap:10px;padding:2px 0 12px;
}
.resultbar-meta{flex:1;min-width:0;display:flex;flex-direction:column;}
.resultbar-meta strong{font-size:16px;}
.resultbar-meta span{font-size:12px;color:var(--text-3);overflow:hidden;text-overflow:ellipsis;white-space:nowrap;}

.result-body{flex:1;min-height:0;display:flex;flex-direction:column;gap:12px;padding-bottom:14px;overflow-y:auto;-webkit-overflow-scrolling:touch;}

.thumb-card{
  position:relative;border-radius:var(--radius-s);overflow:hidden;
  border:1px solid var(--line);background:var(--bg-sunken);
  max-height:132px;display:flex;justify-content:center;
}
.thumb-card img{max-height:132px;max-width:100%;object-fit:contain;display:block;}
.thumb-zoom{
  position:absolute;right:8px;bottom:8px;width:32px;height:32px;padding:7px;
  border-radius:9px;background:rgba(10,12,18,.6);color:#fff;backdrop-filter:blur(8px);
}

.result-text{
  flex:1;min-height:180px;resize:none;
  width:100%;padding:14px;
  border-radius:var(--radius);border:1px solid var(--line);
  background:var(--bg-elev);color:var(--text);
  font-size:15.5px;line-height:1.72;
  font-family:ui-monospace,SFMono-Regular,Menlo,"Cascadia Mono","Microsoft YaHei Mono",monospace;
  box-shadow:var(--shadow-1);
  outline:none;
  -webkit-user-select:text;user-select:text;
}
.result-text:focus{border-color:var(--accent);box-shadow:0 0 0 3px var(--accent-soft);}

.statbar{
  display:flex;flex-wrap:wrap;gap:6px;
}
.statbar span{
  font-size:11.5px;color:var(--text-2);
  background:var(--bg-sunken);padding:4px 9px;border-radius:7px;
  font-variant-numeric:tabular-nums;
}
.actiongrid{display:grid;grid-template-columns:1fr 1fr;gap:10px;}

/* ---------------- 历史 ---------------- */
.histbar{display:flex;align-items:center;justify-content:space-between;padding:2px 0 12px;}
.histbar strong{font-size:16px;}
.histlist{flex:1;overflow-y:auto;-webkit-overflow-scrolling:touch;display:flex;flex-direction:column;gap:10px;padding-bottom:16px;}
.hcard{
  display:flex;gap:11px;align-items:flex-start;
  background:var(--bg-elev);border:1px solid var(--line);border-radius:var(--radius-s);
  padding:11px;box-shadow:var(--shadow-1);text-align:left;width:100%;
  transition:.16s;
}
.hcard:active{transform:scale(.985);}
.hcard img{
  width:56px;height:56px;flex:0 0 56px;object-fit:cover;border-radius:9px;
  background:var(--bg-sunken);border:1px solid var(--line);
}
.hcard-txt{flex:1;min-width:0;}
.hcard-txt p{
  margin:0;font-size:13.5px;line-height:1.5;color:var(--text);
  display:-webkit-box;-webkit-line-clamp:2;-webkit-box-orient:vertical;overflow:hidden;
  overflow-wrap:anywhere;
}
.hcard-txt time{font-size:11px;color:var(--text-3);display:block;margin-top:5px;}
.empty{
  flex:1;display:flex;flex-direction:column;align-items:center;justify-content:center;
  gap:10px;color:var(--text-3);font-size:13.5px;padding-bottom:60px;
}
.empty svg{width:52px;height:52px;}

/* ---------------- 遮罩 / 进度 ---------------- */
.overlay{
  position:fixed;inset:0;z-index:100;
  display:grid;place-items:center;padding:24px;
  background:color-mix(in srgb,var(--bg) 72%, transparent);
  backdrop-filter:blur(14px);
  -webkit-backdrop-filter:blur(14px);
  animation:fadein .18s ease;
}
@keyframes fadein{from{opacity:0}to{opacity:1}}
.overlay-card{
  width:100%;max-width:330px;
  background:var(--bg-elev);border:1px solid var(--line);
  border-radius:20px;padding:26px 22px 22px;text-align:center;
  box-shadow:var(--shadow-2);
}
.overlay-card h3{margin:14px 0 4px;font-size:16.5px;}
.overlay-card p{margin:0;font-size:13px;color:var(--text-2);min-height:19px;}
.ov-note{font-size:11.5px !important;color:var(--ok) !important;font-weight:600 !important;margin-top:12px !important;line-height:1.5;}
.spinner{
  width:44px;height:44px;margin:0 auto;border-radius:50%;
  border:3.5px solid var(--line-2);border-top-color:var(--accent);
  animation:spin .8s linear infinite;
}
.spinner.hidden{display:none !important;}
@keyframes spin{to{transform:rotate(360deg)}}
.bar{
  height:6px;border-radius:99px;background:var(--bg-sunken);margin-top:16px;overflow:hidden;
}
.bar-fill{
  height:100%;width:0%;border-radius:99px;position:relative;overflow:hidden;
  background:linear-gradient(90deg,var(--accent),var(--accent-2));
  transition:width .25s ease;
}
/* 流光：用 transform 的动画跑在合成线程上，
   即使主线程被 WASM 推理占满，用户也能看到进度条一直在动 —— 这是"没卡死"的关键信号 */
.bar-fill::after{
  content:'';position:absolute;inset:0;
  background:linear-gradient(90deg,transparent 0%,rgba(255,255,255,.5) 50%,transparent 100%);
  transform:translateX(-100%);
  animation:barflow 1.15s linear infinite;
}
@keyframes barflow{to{transform:translateX(100%)}}

/* 步骤指示器：让用户知道现在走到第几步，而不是干等一个转圈 */
.steps{display:flex;gap:7px;justify-content:center;margin-top:14px;}
.steps .step{
  width:7px;height:7px;border-radius:50%;background:var(--line-2);
  transition:background .2s ease,transform .2s ease;
}
.steps .step.done{background:var(--accent);opacity:.55;}
.steps .step.now{background:var(--accent);transform:scale(1.55);opacity:1;}
.ov-step-label{
  font-size:11.5px !important;color:var(--text-2) !important;margin-top:8px !important;
  min-height:16px !important;
}
.ov-time{
  font-size:11.5px !important;color:var(--text-3) !important;margin-top:4px !important;
  font-variant-numeric:tabular-nums;min-height:16px !important;
}

/* 图片查看 */
.viewer{background:rgba(4,6,10,.94);padding:env(safe-area-inset-top) 0 env(safe-area-inset-bottom);}
.viewer img{max-width:100%;max-height:88dvh;object-fit:contain;border-radius:8px;}
.viewer-close{
  position:absolute;top:calc(var(--safe-t) + 14px);right:16px;
  width:40px;height:40px;padding:9px;border-radius:50%;
  background:rgba(255,255,255,.14);color:#fff;z-index:2;
}

/* ---------------- 底部弹层 ---------------- */
.sheet-wrap{position:fixed;inset:0;z-index:110;display:flex;flex-direction:column;justify-content:flex-end;}
.sheet-mask{position:absolute;inset:0;background:rgba(8,10,16,.42);animation:fadein .2s;}
.sheet{
  position:relative;background:var(--bg-elev);
  border-radius:22px 22px 0 0;
  max-height:88dvh;display:flex;flex-direction:column;
  box-shadow:var(--shadow-2);
  animation:slideup .26s cubic-bezier(.22,.9,.28,1);
  margin:0 auto;width:100%;max-width:720px;
}
@keyframes slideup{from{transform:translateY(100%)}to{transform:translateY(0)}}
.sheet-grab{width:38px;height:4px;border-radius:99px;background:var(--line-2);margin:9px auto 0;flex:0 0 auto;}
.sheet-head{
  display:flex;align-items:center;justify-content:space-between;
  padding:10px 18px 6px;flex:0 0 auto;
}
.sheet-head strong{font-size:17px;}
.sheet-body{overflow-y:auto;-webkit-overflow-scrolling:touch;padding:6px 18px calc(24px + var(--safe-b));}
.sheet.mini{max-height:none;}

.fgroup{padding:14px 0;border-top:1px solid var(--line);}
.fgroup:first-child{border-top:0;}
.fgroup > label{
  display:block;font-size:13px;font-weight:600;color:var(--text-2);
  margin-bottom:10px;letter-spacing:.2px;
}
.tip{font-size:11.5px;color:var(--text-3);line-height:1.65;margin:9px 0 0;font-weight:400;}
.privacy-note{display:flex;align-items:center;gap:6px;font-size:12.5px;font-weight:600;color:var(--ok);line-height:1.55;margin:10px 0 0;}
.privacy-note svg{width:16px;height:16px;flex:0 0 auto;}
.engine-name{
  margin:2px 0 0;font-size:15px;font-weight:500;color:var(--text);
  letter-spacing:.2px;
}
.switchrow{
  display:flex;align-items:flex-start;justify-content:space-between;gap:14px;
  font-size:14.5px;font-weight:500;color:var(--text) !important;margin-bottom:0 !important;
}
.switchrow .tip{display:block;margin-top:4px;}

.sw{
  appearance:none;-webkit-appearance:none;flex:0 0 50px;
  width:50px;height:30px;border-radius:99px;background:var(--line-2);
  position:relative;transition:.22s;cursor:pointer;margin-top:2px;
}
.sw::after{
  content:"";position:absolute;top:3px;left:3px;width:24px;height:24px;border-radius:50%;
  background:#fff;box-shadow:0 1px 3px rgba(0,0,0,.3);transition:.22s;
}
.sw:checked{background:linear-gradient(145deg,var(--accent),var(--accent-2));}
.sw:checked::after{transform:translateX(20px);}
.sw[disabled]{opacity:.5;}

.seg{
  display:flex;gap:5px;background:var(--bg-sunken);padding:4px;border-radius:13px;
  overflow-x:auto;scrollbar-width:none;
}
.seg::-webkit-scrollbar{display:none;}
.seg button{
  flex:1;min-width:70px;height:38px;border-radius:10px;
  font-size:13.5px;color:var(--text-2);font-weight:500;transition:.16s;
  white-space:nowrap;
}
.seg button.is-on{background:var(--bg-elev);color:var(--text);box-shadow:var(--shadow-1);}

/* ---------------- Toast ---------------- */
.toast{
  position:fixed;left:50%;bottom:calc(var(--tabh) + var(--safe-b) + 22px);
  transform:translate(-50%,14px);
  background:rgba(20,23,30,.94);color:#fff;
  padding:11px 18px;border-radius:13px;font-size:13.5px;
  max-width:min(88vw,420px);text-align:center;
  opacity:0;pointer-events:none;transition:.24s;z-index:200;
  backdrop-filter:blur(10px);
  box-shadow:0 14px 34px -12px rgba(0,0,0,.6);
}
html[data-theme="dark"] .toast{background:rgba(238,242,248,.96);color:#12151b;}
.toast.show{opacity:1;transform:translate(-50%,0);}

/* ---------------- 桌面微调 ---------------- */
@media (min-width:760px){
  .app{border-left:1px solid var(--line);border-right:1px solid var(--line);height:var(--app-h,100dvh);}
  body{background:var(--bg-sunken);}
}
/* 取景窗给个下限，但只在够高的窗口上生效 —— 否则会把底栏挤出屏幕 */
@media (min-width:760px) and (min-height:820px){
  .stage{min-height:420px;}
}
/* 窄屏：压缩顶栏留白，保证「拍照识字」标题和「安装到手机桌面」都能完整显示 */
@media (max-width:400px){
  .topbar{padding-left:10px;padding-right:10px;gap:8px;}
  .main{padding:0 10px;}
  .topbar-actions{gap:4px;}
  .topbar .iconbtn{width:34px;height:34px;padding:8px;}
  .brand{gap:8px;}
  .logo{width:32px;height:32px;flex:0 0 32px;padding:7px;}
  .topbtn{padding:0 9px;}
}
@media (prefers-reduced-motion:reduce){
  *{animation-duration:.01ms !important;transition-duration:.01ms !important;}
}