/* ============================================================
   PhotoChange — Deep Space Glow v2 (Raycast-inspired)
   近黑蓝底 · 三层氛围光晕 · 玻璃拟态面板 · 蓝紫渐变强调
   ============================================================ */
:root{
  --bg-void:#07080a;
  --bg-surface:#101114;
  --bg-elevated:#1b1c1e;
  --bg-input:rgba(7,8,10,.85);
  --border-subtle:rgba(255,255,255,.07);
  --border-strong:rgba(255,255,255,.14);
  --text-primary:#f9f9f9;
  --text-secondary:#d4d6da;
  --text-muted:#9c9ea3;
  --text-faint:#7b7d83;
  --accent:#55b3ff;
  --accent-soft:rgba(85,179,255,.16);
  --radius-sm:8px;
  --radius-md:12px;
  --radius-lg:16px;
  --ctl-h:34px;
  --shadow-card:0 0 0 1px rgba(0,0,0,.35),0 16px 40px rgba(0,0,0,.42),inset 0 1px 0 rgba(255,255,255,.05);
  --font:'Inter',system-ui,-apple-system,'Segoe UI',Roboto,'Helvetica Neue',Arial,'PingFang SC','Microsoft YaHei',sans-serif;
}

*{box-sizing:border-box}
/* 自托管 Inter 可变字体（latin 子集 48KB，覆盖 400-700；中文回退系统字体） */
@font-face{
  font-family:'Inter';
  font-style:normal;
  font-weight:400 700;
  font-display:swap;
  src:url('./fonts/inter-latin-var.woff2') format('woff2');
  unicode-range:U+0000-00FF,U+0131,U+0152-0153,U+02BB-02BC,U+02C6,U+02DA,U+02DC,U+0304,U+0308,U+0329,U+2000-206F,U+20AC,U+2122,U+2191,U+2193,U+2212,U+2215,U+FEFF,U+FFFD;
}
html{height:100%;background:var(--bg-void)}
body{
  margin:0;min-height:100%;
  display:flex;flex-direction:column;
  font-family:var(--font);font-size:14px;font-weight:500;line-height:1.5;letter-spacing:.2px;
  color:var(--text-secondary);background:transparent;
  -webkit-font-smoothing:antialiased;
}
/* ---- 三层深空氛围光晕 ---- */
body::before{
  content:"";position:fixed;inset:0;z-index:-1;pointer-events:none;
  background:
    radial-gradient(1000px 540px at 50% -12%, rgba(85,163,255,.16), transparent 62%),
    radial-gradient(760px 520px at 94% 4%, rgba(129,140,248,.11), transparent 60%),
    radial-gradient(900px 640px at -12% 112%, rgba(56,189,248,.09), transparent 62%);
}
::selection{background:rgba(85,179,255,.32);color:#fff}
:focus-visible{outline:2px solid var(--accent);outline-offset:2px;border-radius:6px}

/* 全局隐藏滚动条（滚轮/触摸板滚动不受影响），锚点平滑滚动 */
html{scrollbar-width:none;-ms-overflow-style:none}
::-webkit-scrollbar{width:0;height:0;display:none}
html,body{overflow:hidden;height:100%}

/* ---------------- 特效点阵层 ---------------- */
#fx-canvas{position:fixed;inset:0;z-index:0;pointer-events:none}
.hero,.app-header,#app{position:relative;z-index:1}

/* ---------------- Header ---------------- */
.app-header{
  display:flex;align-items:center;gap:14px;
  padding:12px 24px;
  border-bottom:1px solid var(--border-subtle);
  background:rgba(7,8,10,.72);-webkit-backdrop-filter:blur(12px);backdrop-filter:blur(12px);
  position:sticky;top:0;z-index:20;
}
/* 底部渐变光线 */
.app-header::after{
  content:"";position:absolute;left:0;right:0;bottom:-1px;height:1px;pointer-events:none;
  background:linear-gradient(90deg,transparent 4%,rgba(85,179,255,.55) 32%,rgba(129,140,248,.45) 68%,transparent 96%);
}
/* 返回主页按钮（功能页 header 左侧） */
.back-home{
  display:inline-flex;align-items:center;gap:6px;height:30px;padding:0 12px;
  background:transparent;border:1px solid var(--border-subtle);border-radius:999px;
  color:var(--text-muted);font-family:var(--font);font-size:12.5px;letter-spacing:.2px;
  cursor:pointer;transition:all .18s ease;flex:none;
}
.back-home:hover{color:var(--text-primary);border-color:var(--border-strong);background:rgba(255,255,255,.05)}
@keyframes dot-pulse{
  0%,100%{box-shadow:0 0 8px rgba(85,179,255,.8),0 0 18px rgba(85,179,255,.35)}
  50%{box-shadow:0 0 14px rgba(85,179,255,1),0 0 30px rgba(85,179,255,.6)}
}
.subtitle{color:var(--text-faint);font-size:13px;line-height:1;padding-top:1px}

/* ---------------- 布局骨架 ---------------- */
.app-main{
  flex:1;min-height:0;width:100%;max-width:1500px;margin:0 auto;
  display:flex;flex-direction:column;gap:12px;
  padding:14px 20px;
  overflow:auto;
}
.left{flex:1;display:flex;flex-direction:column;gap:10px;min-width:0;min-height:0}
.display-main-container{flex:1;display:flex;flex-direction:column;min-height:0}

/* ---------------- 拖放区 ---------------- */
.dropzone{
  border:1px dashed rgba(255,255,255,.17);border-radius:var(--radius-md);
  display:flex;align-items:center;justify-content:center;
  min-height:72px;padding:10px 14px;
  background:linear-gradient(180deg,rgba(21,23,29,.5),rgba(13,14,17,.55));
  transition:border-color .18s ease,background .18s ease,padding .18s ease,min-height .18s ease;
}
.dropzone.hover{border-color:var(--accent);background:rgba(85,179,255,.07);box-shadow:0 0 0 3px var(--accent-soft),0 0 30px rgba(85,179,255,.12)}
.dz-inner{display:flex;align-items:center;gap:16px;padding:2px 4px}
.dz-icon{color:var(--text-faint);transition:color .18s ease,transform .18s ease}
.dropzone.hover .dz-icon{color:var(--accent);transform:translateY(-2px)}
.dz-copy{display:flex;flex-direction:column;gap:2px}
.dz-title{font-size:14px;font-weight:600;color:var(--text-primary);line-height:1.4}
.dz-hint{opacity:.55;font-size:12px;line-height:1.4}
.dz-inner .btn{margin-left:12px;flex:none}
body.has-image .dropzone{min-height:0;padding:7px 14px}
body.has-image .dz-icon,body.has-image .dz-hint{display:none}
/* 空态呼吸辉光：合成器友好的 opacity 动画,仅未加载图片时出现 */
@keyframes breath{0%,100%{opacity:.3}50%{opacity:1}}
body:not(.has-image) .dropzone{position:relative}
body:not(.has-image) .dropzone::after{
  content:"";position:absolute;inset:-1px;border-radius:var(--radius-md);pointer-events:none;
  box-shadow:0 0 24px rgba(85,163,255,.16),inset 0 0 20px rgba(85,163,255,.06);
  animation:breath 3.4s ease-in-out infinite;
}

#fileInput{display:none}

/* ---------------- 工具条（悬浮胶囊） ---------------- */
.image-tools-fixed{
  display:none;justify-content:center;align-items:center;gap:4px;
  padding:5px;margin-bottom:8px;
  background:rgba(15,16,20,.78);-webkit-backdrop-filter:blur(12px);backdrop-filter:blur(12px);
  border:1px solid var(--border-subtle);border-radius:999px;
  width:max-content;margin-left:auto;margin-right:auto;
  box-shadow:0 8px 24px rgba(0,0,0,.4),inset 0 1px 0 rgba(255,255,255,.06);
}
.image-tools-fixed button{
  display:inline-flex;align-items:center;justify-content:center;gap:6px;
  height:30px;min-width:30px;padding:0 9px;
  background:transparent;border:none;color:var(--text-muted);
  font-size:12px;font-weight:500;font-family:var(--font);letter-spacing:.2px;
  cursor:pointer;border-radius:999px;transition:all .18s ease;
}
.image-tools-fixed button:hover{color:var(--text-primary);background:rgba(255,255,255,.08)}
.image-tools-fixed button.active{color:var(--accent);background:var(--accent-soft);box-shadow:inset 0 0 0 1px rgba(85,179,255,.3)}
.image-tools-fixed svg{width:16px;height:16px;display:block}
.zoom-text{color:var(--text-primary);font-size:12px;font-weight:600;min-width:46px;text-align:center;font-variant-numeric:tabular-nums}
.v-line{width:1px;height:16px;background:rgba(255,255,255,.13)}

/* ---------------- 画布区（舞台） ---------------- */
.canvas-wrap{
  flex:1;min-height:150px;
  display:flex;align-items:center;justify-content:center;
  border:1px solid var(--border-subtle);border-radius:var(--radius-lg);
  position:relative;overflow:hidden;
  background:
    radial-gradient(68% 58% at 50% 40%, rgba(85,163,255,.075), transparent 72%),
    #0a0b0d;
  box-shadow:var(--shadow-card);
}
.canvas-wrap.grid-on{
  background-image:
    linear-gradient(to right,rgba(255,255,255,.05) 1px,transparent 1px),
    linear-gradient(to bottom,rgba(255,255,255,.05) 1px,transparent 1px),
    radial-gradient(68% 58% at 50% 40%, rgba(85,163,255,.075), transparent 72%);
  background-size:20px 20px,20px 20px,100% 100%;
}
canvas{
  max-width:100%;max-height:100%;image-rendering:auto;
  transition:transform .3s ease;
  transform:scaleX(var(--flip-x,1)) scaleY(var(--flip-y,1)) rotate(var(--rotation-angle,0deg)) scale(var(--zoom-level,1));
  filter:drop-shadow(0 12px 32px rgba(0,0,0,.55));
  user-select:none;-webkit-user-select:none;
}
/* 图片加载后画布接管触摸：拖动=框选裁剪，不触发页面滚动 */
body.has-image canvas{touch-action:none}

/* 空状态提示 */
.canvas-hint{
  position:absolute;inset:0;display:flex;flex-direction:column;align-items:center;justify-content:center;
  gap:10px;pointer-events:none;text-align:center;padding:20px;
}
.canvas-hint svg{
  width:46px;height:46px;color:var(--text-faint);opacity:.9;
  filter:drop-shadow(0 0 14px rgba(85,163,255,.35));
  animation:hint-float 3.6s ease-in-out infinite;
}
@keyframes hint-float{0%,100%{transform:translateY(0)}50%{transform:translateY(-6px)}}
.canvas-hint p{margin:0;font-size:15px;font-weight:600;color:var(--text-muted)}
.canvas-hint span{font-size:12px;color:var(--text-faint)}
body.has-image .canvas-hint{display:none}

/* 信息徽章 */
.badge{
  position:absolute;right:10px;bottom:10px;z-index:2;
  background:rgba(10,11,13,.8);-webkit-backdrop-filter:blur(8px);backdrop-filter:blur(8px);
  border:1px solid var(--border-subtle);border-radius:999px;
  padding:6px 12px;font-size:12px;color:var(--text-secondary);
}
.badge em{font-style:normal;color:var(--accent);font-weight:600}
.badge .num{font-variant-numeric:tabular-nums;color:var(--text-primary)}

/* ---------------- 右侧工具面板（玻璃拟态） ---------------- */
/* ---------------- 编辑工具条 + 操作条 ---------------- */
.edit-toolbar{
  display:flex;align-items:center;justify-content:center;gap:4px;flex-wrap:wrap;row-gap:4px;
  max-width:100%;
  padding:5px;
  background:rgba(15,16,20,.78);-webkit-backdrop-filter:blur(12px);backdrop-filter:blur(12px);
  border:1px solid var(--border-subtle);border-radius:999px;
  width:max-content;margin:0 auto;
  box-shadow:0 8px 24px rgba(0,0,0,.4),inset 0 1px 0 rgba(255,255,255,.06);
}
.etool{
  display:inline-flex;align-items:center;gap:6px;height:32px;padding:0 13px;
  background:transparent;border:none;color:var(--text-muted);
  font-size:12.5px;font-weight:500;font-family:var(--font);letter-spacing:.2px;
  cursor:pointer;border-radius:999px;transition:all .18s ease;
}
.etool:hover:not(:disabled){color:var(--text-primary);background:rgba(255,255,255,.08)}
.etool.active{color:var(--accent);background:var(--accent-soft);box-shadow:inset 0 0 0 1px rgba(85,179,255,.3)}
.etool:disabled{opacity:.35;cursor:not-allowed}
.opstrip{
  display:flex;align-items:center;gap:10px;flex-wrap:wrap;justify-content:center;
  padding:8px 14px;
  background:rgba(15,16,20,.72);-webkit-backdrop-filter:blur(12px);backdrop-filter:blur(12px);
  border:1px solid var(--border-subtle);border-radius:var(--radius-md);
  animation:strip-in .22s ease;
}
@keyframes strip-in{from{opacity:0;transform:translateY(-4px)}to{opacity:1;transform:none}}
.opstrip label{font-size:13px;color:var(--text-muted);line-height:1;flex:none}
.op-tip{font-size:12px;color:var(--text-faint);line-height:1}
.op-x{color:var(--text-faint)}
.op-label{white-space:nowrap}

/* ---------------- 底部导出条 ---------------- */
.export-bar{
  display:flex;align-items:center;gap:14px;flex-wrap:wrap;
  padding:10px 14px;
  background:linear-gradient(180deg,rgba(21,23,29,.66),rgba(12,13,16,.78));
  -webkit-backdrop-filter:blur(14px);backdrop-filter:blur(14px);
  border:1px solid rgba(255,255,255,.08);border-radius:var(--radius-lg);
  box-shadow:var(--shadow-card);
  position:relative;
}
.export-bar::before{
  content:"";position:absolute;top:0;left:12%;right:12%;height:1px;pointer-events:none;
  background:linear-gradient(90deg,transparent,rgba(255,255,255,.28),transparent);
}
.eb-group{display:flex;align-items:center;gap:8px;min-height:34px}
.eb-group label{font-size:13px;color:var(--text-muted);line-height:1;white-space:nowrap}
.eb-group select{width:auto;min-width:86px;flex:none}
.eb-group input[type=number]{width:70px;flex:none}
.eb-group.grow{flex:1;min-width:140px}
.eb-unit{font-size:12px;color:var(--text-faint)}
.eb-download{
  display:flex;flex-direction:column;align-items:stretch;gap:4px;
  min-width:170px;margin-left:auto;
}
.eb-download .btn.wide{height:38px}
/* 开发者支持入口：免费无限制，非阻断的感谢渠道 */
.support-link{font-size:12px;color:var(--text-muted);text-align:center;text-decoration:none;line-height:1.4}
.support-link:hover{color:var(--accent)}
.hidden{display:none !important}
input[type=text],input[type=number],select{
  flex:1;min-width:0;height:var(--ctl-h);
  background:var(--bg-input);
  border:1px solid var(--border-strong);border-radius:var(--radius-sm);
  padding:0 10px;color:var(--text-primary);
  font-family:var(--font);font-size:13px;letter-spacing:.2px;line-height:1;
  transition:border-color .18s ease,box-shadow .18s ease;
}
select{cursor:pointer}
input[type=text]:focus,input[type=number]:focus,select:focus{
  outline:none;border-color:var(--accent);
  box-shadow:0 0 0 3px var(--accent-soft),0 0 16px rgba(85,179,255,.15);
}
input::placeholder{color:var(--text-faint)}
input::-webkit-outer-spin-button,input::-webkit-inner-spin-button{-webkit-appearance:none;margin:0}
input[type='number']{-moz-appearance:textfield}
/* 颜色输入与预设色板（证件照换底/装饰边框） */
input[type=color]{
  width:36px;height:var(--ctl-h);padding:2px 3px;flex:none;
  background:var(--bg-input);border:1px solid var(--border-strong);border-radius:var(--radius-sm);cursor:pointer;
}
.swatches{display:flex;gap:6px;flex:none;align-items:center}
.swatch{
  width:22px;height:22px;border-radius:50%;cursor:pointer;padding:0;
  border:1px solid var(--border-strong);
  transition:transform .15s ease,box-shadow .15s ease;
}
.swatch:hover{transform:scale(1.18);box-shadow:0 0 8px rgba(85,179,255,.45)}
/* 批量面板 */
.batch-panel{
  background:rgba(15,16,20,.72);-webkit-backdrop-filter:blur(12px);backdrop-filter:blur(12px);
  border:1px solid var(--border-subtle);border-radius:var(--radius-md);
  padding:8px 14px;margin-bottom:8px;
}
.batch-head{display:flex;align-items:center;gap:12px;flex-wrap:wrap}
.batch-head>span:first-child{font-size:13px;color:var(--text-secondary);font-weight:600}
.batch-switch{flex:0 0 auto}
.batch-list{
  list-style:none;margin:6px 0 0;padding:0;max-height:150px;overflow:auto;
  display:flex;flex-direction:column;gap:2px;
}
.batch-list li{
  display:flex;justify-content:space-between;gap:10px;
  font-size:12.5px;color:var(--text-muted);padding:3px 6px;border-radius:6px;
}
.batch-list li:nth-child(odd){background:rgba(255,255,255,.03)}
.batch-status{color:var(--text-faint);font-variant-numeric:tabular-nums;flex:none}
.batch-tip{margin-top:6px;font-size:11px;color:var(--text-faint)}
input[type=range]{flex:1;height:var(--ctl-h);accent-color:var(--accent);margin:0}
#qualityValue{min-width:34px;text-align:right;font-variant-numeric:tabular-nums;font-size:13px;color:var(--text-secondary)}

/* 开关 */
.switch{display:flex;align-items:center;gap:8px;cursor:pointer;user-select:none;flex:1}
.switch input{
  appearance:none;-webkit-appearance:none;margin:0;flex:none;
  width:34px;height:20px;border-radius:999px;position:relative;cursor:pointer;
  background:var(--bg-elevated);border:1px solid var(--border-strong);
  transition:background .18s ease,border-color .18s ease,box-shadow .18s ease;
}
.switch input::after{
  content:"";position:absolute;top:2px;left:2px;width:14px;height:14px;border-radius:50%;
  background:var(--text-muted);transition:transform .18s ease,background .18s ease;
}
.switch input:checked{background:var(--accent-soft);border-color:var(--accent);box-shadow:0 0 10px rgba(85,179,255,.25)}
.switch input:checked::after{transform:translateX(14px);background:var(--accent)}
.switch span{font-size:13px;line-height:1;color:var(--text-muted)}

/* ---------------- 按钮 ---------------- */
.btn{
  display:inline-flex;align-items:center;justify-content:center;
  height:var(--ctl-h);padding:0 14px;
  border:1px solid var(--border-strong);background:transparent;color:var(--text-primary);
  border-radius:var(--radius-sm);cursor:pointer;
  font-family:var(--font);font-size:13px;font-weight:500;letter-spacing:.3px;line-height:1;
  transition:all .18s ease;white-space:nowrap;
}
.btn:hover{border-color:rgba(255,255,255,.3);background:rgba(255,255,255,.05)}
.btn.ghost{background:transparent;border-color:var(--border-subtle);color:var(--text-muted)}
.btn.ghost:hover{color:var(--text-primary);border-color:var(--border-strong)}
/* 主按钮：蓝紫渐变 + 外发光（两端色值经校准，白字对比度 ≥4.5:1） */
.btn.primary{
  background:linear-gradient(135deg,#2378cf 0%,#4e5ed8 100%);
  color:#fff;border:1px solid rgba(160,180,255,.4);border-radius:999px;font-weight:600;
  box-shadow:0 4px 16px rgba(85,140,255,.35),inset 0 1px 0 rgba(255,255,255,.3);
}
.btn.primary:hover{
  box-shadow:0 4px 24px rgba(85,140,255,.55),0 0 30px rgba(129,140,248,.3),inset 0 1px 0 rgba(255,255,255,.35);
  filter:brightness(1.08);
}
/* 主按钮悬停流光扫过 */
.btn.primary{position:relative;overflow:hidden}
.btn.primary::after{
  content:"";position:absolute;top:-2px;bottom:-2px;left:0;width:45%;pointer-events:none;
  background:linear-gradient(105deg,transparent,rgba(255,255,255,.5),transparent);
  transform:translateX(-140%) skewX(-18deg);
  transition:transform .55s ease;
}
.btn.primary:hover::after{transform:translateX(330%) skewX(-18deg)}
.btn.wide{width:100%;height:38px;font-size:14px}

/* ---------------- 自定义 alert ---------------- */
.alert-overlay{
  display:none;position:fixed;inset:0;z-index:9999;
  background:rgba(4,5,7,.72);-webkit-backdrop-filter:blur(6px);backdrop-filter:blur(6px);
  justify-content:center;align-items:center;
}
.alert-content{
  background:linear-gradient(180deg,rgba(24,26,33,.94),rgba(13,14,17,.96));
  border:1px solid rgba(255,255,255,.1);border-radius:var(--radius-lg);
  padding:24px;width:300px;text-align:center;
  box-shadow:0 30px 80px rgba(0,0,0,.6),0 0 60px rgba(85,140,255,.08),inset 0 1px 0 rgba(255,255,255,.07);
}
.alert-content p{color:var(--text-primary);margin:0 0 20px;font-size:14px;line-height:1.6}
.alert-btn{
  display:inline-flex;align-items:center;justify-content:center;
  height:34px;padding:0 28px;border:none;border-radius:999px;cursor:pointer;
  background:linear-gradient(135deg,#2378cf,#4e5ed8);color:#fff;
  font-family:var(--font);font-size:13px;font-weight:600;letter-spacing:.3px;
  box-shadow:0 4px 16px rgba(85,140,255,.35),inset 0 1px 0 rgba(255,255,255,.3);
  transition:all .18s ease;
}
.alert-btn:hover{filter:brightness(1.08);box-shadow:0 4px 24px rgba(85,140,255,.55),inset 0 1px 0 rgba(255,255,255,.35)}

/* ---------------- 双屏轨道结构 ---------------- */
.page-track{
  height:100vh;height:100svh;
  display:flex;flex-direction:column;
  transition:transform .9s cubic-bezier(.22,.9,.28,1);
  will-change:transform;
}
.page-track>*{flex:0 0 100%;min-height:0}
.page-track>.is-active{position:relative;z-index:2;animation:page-settle .9s cubic-bezier(.22,.9,.28,1)}
@keyframes page-settle{from{transform:scale(.985)}to{transform:none}}
.page-track>*:not(.is-active){filter:brightness(.55) saturate(.7);pointer-events:none}
.page-track>.is-active{transition:filter .9s ease}
.page-track>*:not(.is-active){transition:filter .9s ease}

/* ---------------- 着陆屏（Hero） ---------------- */
.hero{
  position:relative;z-index:1;
  min-height:100vh;min-height:100svh;
  display:flex;flex-direction:column;align-items:center;justify-content:center;
  text-align:center;padding:40px 20px 100px;
}
/* 入场:依次浮现(rise-in 系列);视差:指针驱动核心层反向轻移。
   两套效果作用在不同元素上,避免 transform 互相覆盖 */
@keyframes rise-in{
  from{opacity:0;transform:translateY(18px)}
  to{opacity:1;transform:none}
}
.hero-core{
  display:flex;flex-direction:column;align-items:center;
  transform:translate3d(calc(var(--px,0)*-9px),calc(var(--py,0)*-7px),0);
  will-change:transform;
}
.hero-beacon{
  width:10px;height:10px;border-radius:50%;flex:none;
  background:var(--accent);
  box-shadow:0 0 12px rgba(85,179,255,.95),0 0 30px rgba(85,179,255,.5);
  animation:dot-pulse 3s ease-in-out infinite,rise-in .7s cubic-bezier(.22,.9,.28,1) both;
  margin-bottom:28px;
}
.hero-title{
  margin:0;font-size:clamp(48px,12.5vw,164px);font-weight:800;letter-spacing:-.035em;line-height:1.05;
  /* 兜底渐变：hero-art.js 加载前 / 失败时仍是可读标题；加载后被照片填充覆盖 */
  background:linear-gradient(92deg,#ffffff 20%,#9cc8ff 55%,#b7b9ff 90%);
  -webkit-background-clip:text;background-clip:text;color:transparent;
  -webkit-text-stroke:1.2px rgba(255,255,255,.3);
  filter:drop-shadow(0 0 34px rgba(85,163,255,.42)) drop-shadow(0 14px 40px rgba(0,0,0,.6));
  animation:rise-in .7s .1s cubic-bezier(.22,.9,.28,1) both;
}
/* 胶片颗粒：全页固定覆盖层（js/hero-art.js 注入），压住"纯数字渲染"的塑料感 */
.hero-grain{
  position:fixed;inset:0;z-index:2;pointer-events:none;opacity:.055;
  background-image:url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='160' height='160'%3E%3Cfilter id='n'%3E%3CfeTurbulence type='fractalNoise' baseFrequency='0.9' numOctaves='2'/%3E%3C/filter%3E%3Crect width='160' height='160' filter='url(%23n)' opacity='0.55'/%3E%3C/svg%3E");
}
.hero-sub{margin:18px 0 0;font-size:15px;color:var(--text-muted);letter-spacing:.14em;animation:rise-in .7s .22s cubic-bezier(.22,.9,.28,1) both}
.hero-meta{
  display:flex;align-items:center;justify-content:center;flex-wrap:wrap;gap:8px;
  margin-top:28px;color:var(--text-faint);font-size:12.5px;line-height:1;
  animation:rise-in .7s .34s cubic-bezier(.22,.9,.28,1) both;
}
.hero-meta .github-avatar{width:20px;height:20px;border-radius:50%;display:block}
.hero-meta .sep{opacity:.5}
/* 安装到主屏幕：独立应用按钮（js/install.js 控制显隐） */
.install-btn{
  display:inline-flex;align-items:center;gap:6px;height:26px;padding:0 12px;
  border:1px solid rgba(147,197,253,.45);border-radius:999px;cursor:pointer;flex:none;
  background:rgba(85,179,255,.1);color:#cfe0ef;
  font-family:var(--font);font-size:12px;font-weight:500;
  transition:all .18s ease;
}
.install-btn:hover{background:rgba(85,179,255,.22);border-color:rgba(147,197,253,.85);color:#fff}
.install-btn svg{width:13px;height:13px;display:block}

/* 底部下滑提示箭头：透明 + 呼吸浮动（定位在包裹层，入场与 bob 分离互不打架） */
.scroll-hint-wrap{
  position:absolute;bottom:30px;left:50%;transform:translateX(-50%);
  animation:rise-in-center .7s .5s cubic-bezier(.22,.9,.28,1) both;
}
@keyframes rise-in-center{
  from{opacity:0;transform:translate(-50%,18px)}
  to{opacity:1;transform:translate(-50%,0)}
}
.scroll-hint{
  background:transparent;border:none;cursor:pointer;
  color:var(--text-muted);padding:10px;line-height:0;
  animation:hint-bob 2.2s ease-in-out infinite;
  transition:color .18s ease;
}
.scroll-hint:hover{color:var(--accent)}
@keyframes hint-bob{
  0%,100%{opacity:.3;transform:translateY(0)}
  50%{opacity:.95;transform:translateY(8px)}
}

/* ---------------- 功能区（第 2 屏） ---------------- */
#app{position:relative;z-index:1;display:flex;flex-direction:column;overflow:hidden}

/* ---------------- 响应式 ---------------- */
@media (max-width:980px){
  .app-main{padding:10px}
  .canvas-wrap{min-height:200px}
  .app-header{padding:10px 16px}
  .hero{padding:40px 20px 90px}
  .opstrip{gap:8px;padding:8px 10px}
  .export-bar{gap:10px;padding:10px}
  .eb-download{margin-left:0;width:100%}
  /* iOS Safari：输入框字号≥16px，避免聚焦时页面自动放大 */
  input[type=text],input[type=number],select{font-size:16px}
}
@media (prefers-reduced-motion:reduce){
  *,*::before,*::after{transition:none !important;animation:none !important}
}

/* 隐私信任条：拖放区下方 */
.privacy-strip{
  display:flex;align-items:center;justify-content:center;gap:8px;
  font-size:12.5px;color:var(--text-muted);letter-spacing:.04em;
}
.privacy-strip svg{flex:none;color:var(--accent)}
.privacy-strip b{color:var(--text);font-weight:600}