/* ===== Reset & Variables ===== */
*,*::before,*::after{margin:0;padding:0;box-sizing:border-box}
:root{
  --bg:#0c0c1a;--card:rgba(255,255,255,0.04);--card-hov:rgba(255,255,255,0.08);
  --border:rgba(255,255,255,0.08);--text:#e8e8f0;--sec:rgba(255,255,255,0.55);
  --muted:rgba(255,255,255,0.3);--accent:#6366f1;--a-glow:rgba(99,102,241,0.3);
  --green:#22c55e;--g-glow:rgba(34,197,94,0.3);
  --orange:#f59e0b;--radius:16px;--rs:10px;
}
html,body{overflow-x:hidden;width:100%;max-width:100vw;-webkit-text-size-adjust:100%}
body{
  font-family:-apple-system,BlinkMacSystemFont,"Segoe UI",Roboto,sans-serif;
  background:var(--bg);color:var(--text);min-height:100vh;min-height:100dvh;
  touch-action:manipulation;
  -ms-content-zooming:none;-ms-touch-action:manipulation;
}
.app{position:relative;z-index:1;max-width:680px;margin:0 auto;padding:20px 16px 40px;overflow-x:hidden}

/* ===== Header ===== */
.header{text-align:center;padding:20px 0 8px}
.logo{font-size:26px;font-weight:700;
  background:linear-gradient(135deg,#a78bfa,#6366f1,#3b82f6);
  -webkit-background-clip:text;-webkit-text-fill-color:transparent;background-clip:text}
.subtitle{color:var(--sec);font-size:13px;margin-top:4px}

/* ===== QR Overlay ===== */
.qr-overlay{
  position:fixed;inset:0;z-index:100;display:flex;align-items:center;justify-content:center;
  background:rgba(0,0,0,.7);backdrop-filter:blur(12px);
  transition:opacity .5s,visibility .5s;
}
.qr-overlay.hidden{opacity:0;visibility:hidden;pointer-events:none}
.qr-card{
  background:rgba(255,255,255,.06);border:1px solid var(--border);border-radius:var(--radius);
  padding:36px 40px 32px;text-align:center;max-width:380px;width:90%;
  backdrop-filter:blur(20px);position:relative;overflow:hidden;
  animation:rise .5s ease-out;
}
@keyframes rise{from{opacity:0;transform:translateY(30px) scale(.95)}to{opacity:1;transform:translateY(0) scale(1)}}
.scan-line{
  position:absolute;left:50%;transform:translateX(-50%);width:190px;height:2px;
  background:linear-gradient(90deg,transparent,var(--accent),transparent);
  animation:scan 2s ease-in-out infinite;top:80px;box-shadow:0 0 12px var(--a-glow);
}
@keyframes scan{0%,100%{top:66px;opacity:.3}50%{top:218px;opacity:1}}
.qr-title{font-size:19px;font-weight:600;margin-bottom:4px}
.qr-subtitle{color:var(--sec);font-size:13px;margin-bottom:20px}
.qr-code-wrap{
  display:inline-flex;align-items:center;justify-content:center;
  background:#fff;padding:10px;border-radius:var(--rs);margin-bottom:16px;
}
.qr-code-wrap canvas,#qrcode canvas,#qrcode img{display:block;width:170px;height:170px}
.qr-url{color:var(--muted);font-size:11px;word-break:break-all;background:rgba(255,255,255,.03);padding:5px 10px;border-radius:6px;user-select:all;cursor:pointer}
.qr-url:hover{background:rgba(255,255,255,.06)}
.qr-hint{color:var(--sec);font-size:13px;margin-top:12px;display:flex;align-items:center;justify-content:center;gap:8px}
.dot-pulse{width:8px;height:8px;border-radius:50%;background:var(--accent);animation:pulse 1.5s ease-in-out infinite}
@keyframes pulse{0%,100%{opacity:.3;transform:scale(.8)}50%{opacity:1;transform:scale(1.2)}}

/* ===== Status Panel ===== */
.status-panel{margin-top:20px}
.conn-bar{
  display:flex;align-items:center;gap:10px;padding:12px 16px;
  background:var(--card);border:1px solid var(--border);border-radius:var(--rs);font-size:14px;
  margin-bottom:16px;transition:all .3s;
}
.conn-bar .dot{width:10px;height:10px;border-radius:50%;flex-shrink:0}
.conn-bar .dot.wait{background:var(--muted)}
.conn-bar .dot.ok{background:var(--green);box-shadow:0 0 8px var(--g-glow)}
.conn-bar .dot.busy{background:var(--orange);box-shadow:0 0 8px var(--orange-glow);animation:pulse 1s ease-in-out infinite}
.live-card{
  background:var(--card);border:1px solid var(--border);border-radius:var(--radius);
  padding:20px 24px;min-height:90px;display:flex;align-items:center;justify-content:center;
  margin-bottom:16px;transition:all .3s;
}
.live-placeholder{text-align:center;color:var(--muted);font-size:14px}
.live-placeholder .big-icon{font-size:36px;display:block;margin-bottom:8px}
.live-status{width:100%}
.sel-row{display:flex;align-items:center;gap:16px}
.sel-spinner{width:36px;height:36px;flex-shrink:0;border:3px solid rgba(255,255,255,.06);border-top-color:var(--accent);border-radius:50%;animation:spin .8s linear infinite}
@keyframes spin{to{transform:rotate(360deg)}}
.sel-info h4{font-size:15px;font-weight:500}
.sel-file{color:var(--sec);font-size:12px;margin-top:2px}
.tf-header{display:flex;align-items:center;gap:10px;margin-bottom:8px}
.tf-icon{font-size:26px;width:36px;text-align:center}
.tf-name{font-size:14px;font-weight:500;word-break:break-all;flex:1}
.tf-size{color:var(--sec);font-size:12px;white-space:nowrap}
.progress-bar{width:100%;height:7px;background:rgba(255,255,255,.06);border-radius:4px;overflow:hidden}
.progress-fill{height:100%;border-radius:4px;background:linear-gradient(90deg,var(--accent),#3b82f6);transition:width .3s;position:relative}
.progress-fill::after{content:'';position:absolute;right:0;top:0;width:18px;height:100%;background:linear-gradient(90deg,transparent,rgba(255,255,255,.3));border-radius:4px}
.progress-info{display:flex;justify-content:space-between;color:var(--sec);font-size:11px;margin-top:5px}
.completed-section{margin-top:28px}
.section-title{margin-bottom:12px}
.section-title h3{font-size:17px;font-weight:600}
.file-grid{display:grid;grid-template-columns:repeat(auto-fill,minmax(170px,1fr));gap:10px}
.file-card{
  background:var(--card);border:1px solid var(--border);border-radius:var(--rs);
  padding:10px;cursor:pointer;transition:all .2s;animation:cardIn .4s ease-out;
}
.file-card:hover{background:var(--card-hov);transform:translateY(-2px);box-shadow:0 6px 20px rgba(0,0,0,.3)}
@keyframes cardIn{from{opacity:0;transform:translateY(14px)}to{opacity:1;transform:translateY(0)}}
.file-thumb{width:100%;height:120px;border-radius:6px;overflow:hidden;background:rgba(0,0,0,.2);display:flex;align-items:center;justify-content:center;margin-bottom:8px}
.file-thumb img,.file-thumb video{width:100%;height:100%;object-fit:cover}
.file-thumb .icon-big{font-size:38px;opacity:.5}
.file-thumb .play-badge{position:absolute;width:32px;height:32px;background:rgba(0,0,0,.5);border-radius:50%;display:flex;align-items:center;justify-content:center;font-size:14px}
.file-name{font-size:12px;font-weight:500;overflow:hidden;text-overflow:ellipsis;white-space:nowrap;margin-bottom:2px}
.file-meta{color:var(--muted);font-size:10px;display:flex;gap:6px}
.file-meta .tag{background:rgba(255,255,255,.04);padding:1px 6px;border-radius:3px}

/* ===== Mobile File Picker — 简洁可靠的设计 ===== */
.page-mobile{--safe-bottom:env(safe-area-inset-bottom,0px)}
.page-mobile .app{
  max-width:100%;padding:0 0 calc(88px + var(--safe-bottom) + 16px);overflow-x:hidden;
}

/* ---- 移动端 Header ---- */
.m-header{
  padding:20px 18px 16px;
  background:linear-gradient(180deg, rgba(99,102,241,0.06) 0%, transparent 100%);
}
.m-header-top{display:flex;align-items:center;justify-content:space-between}
.m-header .logo{font-size:21px;text-align:left;margin-bottom:3px;background:none;-webkit-text-fill-color:var(--text)}
.m-header .subtitle{font-size:12px;color:var(--sec);text-align:left}
.conn-badge{
  display:inline-flex;align-items:center;gap:5px;
  font-size:11px;color:var(--muted);padding:4px 10px;border-radius:20px;
  background:var(--card);border:1px solid var(--border);
  white-space:nowrap;flex-shrink:0;
}
.cb-dot{
  width:6px;height:6px;border-radius:50%;background:var(--muted);
  animation:pulse 1.5s ease-in-out infinite;
}
.conn-badge.connected .cb-dot{background:var(--green);animation:none;box-shadow:0 0 6px var(--g-glow)}
.conn-badge.connected{color:var(--green);border-color:rgba(34,197,94,0.25)}

/* ---- 文件选择区：label 包裹，极简可靠 ---- */
.file-picker{
  display:flex;flex-direction:column;align-items:center;justify-content:center;
  margin:16px 16px 12px;padding:44px 20px 40px;
  border-radius:20px;cursor:pointer;-webkit-tap-highlight-color:transparent;
  background:linear-gradient(145deg, rgba(99,102,241,0.08), rgba(59,130,246,0.03));
  border:1.5px dashed rgba(99,102,241,0.3);
  transition:border-color .25s,background .25s,transform .15s;
  /* label 天然可聚焦 input，不需要 absolute 覆盖 */
}
.file-picker:active,
.file-picker:focus-within{
  transform:scale(0.98);
  border-color:rgba(99,102,241,0.6);
  background:linear-gradient(145deg, rgba(99,102,241,0.14), rgba(59,130,246,0.06));
}
/* 已选文件后的样式 */
.file-picker.has-files{
  border-style:solid;
  border-color:rgba(34,197,94,0.35);
  background:linear-gradient(145deg, rgba(34,197,94,0.08), transparent);
}

.fp-icon{
  font-size:64px;line-height:1;margin-bottom:16px;
  filter:drop-shadow(0 4px 16px rgba(99,102,241,0.25));
  transition:transform .2s;
}
.file-picker:active .fp-icon{transform:scale(1.1)}

.fp-text{
  font-size:18px;font-weight:600;color:var(--text);letter-spacing:0.5px;
}
.fp-hint{
  font-size:12.5px;color:var(--muted);margin-top:8px;
}

/* file input：隐藏但保留 label 关联能力 */
.fp-input{
  position:absolute;width:1px;height:1px;padding:0;margin:-1px;
  overflow:hidden;clip:rect(0,0,0,0);clip-path:inset(50%);
  border:0;white-space:nowrap;
  /* 不用 opacity/absolute 覆盖方案，改用无障碍隐藏 + label for 触发 */
}

.dragover{
  border-color:var(--accent)!important;
  background:rgba(99,102,241,0.1)!important;
}

/* ---- 已选文件区域 ---- */
.fl-section{margin:0 14px 10px;}
.fl-header{
  display:flex;align-items:center;gap:8px;padding:6px 2px;
}
.fl-title{font-size:13px;font-weight:600;color:var(--text)}
.fl-count{
  font-size:11px;color:var(--muted);background:var(--card);
  padding:2px 8px;border-radius:10px;
}
.fl-clear{
  margin-left:auto;font-size:11px;color:var(--muted);
  background:none;border:1px solid var(--border);border-radius:12px;
  padding:3px 10px;cursor:pointer;transition:all .15s;
}
.fl-clear:active{color:#ef4444;border-color:rgba(239,68,68,0.3)}

.file-list{
  display:flex;flex-direction:column;gap:6px;
  max-height:42vh;overflow-y:auto;
  -webkit-overflow-scrolling:touch;
}
.file-list::-webkit-scrollbar{width:3px}
.file-list::-webkit-scrollbar-thumb{background:rgba(255,255,255,.12);border-radius:2px}
.file-item{
  display:flex;align-items:center;gap:10px;
  background:var(--card);border:1px solid var(--border);border-radius:14px;
  padding:12px 14px;animation:slideIn .25s ease-out;
  transition:background .15s;
}
.file-item:active{background:var(--card-hov)}
@keyframes slideIn{from{opacity:0;transform:translateY(8px)}to{opacity:1;transform:translateY(0)}}
.fi-icon{font-size:26px;width:32px;text-align:center;flex-shrink:0}
.fi-info{flex:1;min-width:0}
.fi-name{font-size:13px;font-weight:500;overflow:hidden;text-overflow:ellipsis;white-space:nowrap}
.fi-meta{color:var(--sec);font-size:11px;margin-top:2px;display:flex;gap:6px;align-items:center}
.fi-progress{margin-top:5px}
.fi-progress .pb-outer{width:100%;height:4px;background:rgba(255,255,255,.06);border-radius:2px;overflow:hidden}
.fi-progress .pb-inner{height:100%;background:linear-gradient(90deg,var(--accent),#818cf8);border-radius:2px;transition:width .2s}
.fi-progress .pb-txt{font-size:10px;color:var(--muted);margin-top:2px}
.fi-status{font-size:11px;color:var(--muted);white-space:nowrap;flex-shrink:0;padding-left:4px}
.fi-status.done{color:var(--green)}
.fi-status.err{color:#ef4444}

/* ---- 底部发送栏（固定） ---- */
.m-bottom-bar{
  position:fixed;bottom:0;left:0;right:0;
  z-index:40;
  padding:10px 14px calc(10px + var(--safe-bottom));
  background:linear-gradient(to top, var(--bg) 70%, transparent);
  backdrop-filter:blur(12px);
  -webkit-backdrop-filter:blur(12px);
  /* 上边框分隔线 */
  border-top:1px solid var(--border);
}
.btn-primary{
  display:flex;align-items:center;justify-content:center;gap:6px;
  width:100%;padding:15px 18px;border:none;border-radius:16px;
  font-size:16px;font-weight:700;
  background:linear-gradient(135deg,var(--accent),#4f46e5);
  color:#fff;cursor:pointer;transition:all .2s;
  letter-spacing:0.3px;
  box-shadow:0 4px 20px -4px rgba(99,102,241,0.45);
  position:relative;overflow:hidden;
}
.btn-primary::after{
  content:'';position:absolute;inset:0;background:linear-gradient(135deg,transparent,rgba(255,255,255,.08));
  pointer-events:none;
}
.btn-primary:active{transform:scale(.975);opacity:.92}
.btn-primary:disabled{
  opacity:.38;cursor:not-allowed;transform:none;
  box-shadow:none;
  background:linear-gradient(135deg,#333,#444);
}
.btn-icon{font-size:18px}
.btn-label{flex:1;text-align:center}
.btn-count{font-weight:400;opacity:.85}
.btn-outline{
  background:transparent;border:1px solid var(--border);color:var(--text);
  font-size:14px;padding:12px 28px;border-radius:14px;cursor:pointer;margin-top:16px;
}

/* ---- 发送中遮罩 ---- */
.sending-overlay{
  display:none;position:fixed;inset:0;z-index:60;
  background:rgba(0,0,0,.65);backdrop-filter:blur(10px);
  align-items:center;justify-content:center;
  -webkit-backdrop-filter:blur(10px);
}
.sending-overlay.active{display:flex}
.sending-card{
  background:rgba(22,22,40,.92);border:1px solid var(--border);border-radius:20px;
  padding:32px 28px;text-align:center;max-width:300px;width:88%;
  backdrop-filter:blur(20px);-webkit-backdrop-filter:blur(20px);
}
.sending-card h3{font-size:16px;font-weight:600;margin:12px 0 4px}
.sending-card p{color:var(--sec);font-size:13px}
.spinner-circle{width:42px;height:42px;margin:0 auto;border:3px solid rgba(255,255,255,.07);border-top-color:var(--accent);border-radius:50%;animation:spin .8s linear infinite}
.success-icon{font-size:38px;margin-bottom:8px}
.sending-card .pb{margin:16px 0 5px}
.sending-card .pb .pb-fill{height:6px;border-radius:3px;background:linear-gradient(90deg,var(--accent),#3b82f6);transition:width .2s;width:0%}
.pb-label{font-size:13px;font-weight:600;color:var(--text);margin-top:4px}
.pb-hint{font-size:11px;color:var(--muted);margin-top:2px;min-height:16px}

/* ===== Responsive ===== */
@media(max-width:480px){
  .qr-card{padding:28px 18px}
  .qr-code-wrap canvas,#qrcode canvas,#qrcode img{width:150px;height:150px}
  .file-grid{grid-template-columns:repeat(auto-fill,minmax(140px,1fr))}
  /* 移动端小屏适配 */
  .page-mobile .m-header{padding:16px 14px 12px}
  .file-picker{margin:12px 12px 8px;padding:36px 16px 32px;border-radius:18px}
  .fp-icon{font-size:54px}
  .fl-section{margin:0 12px 8px}
  .m-bottom-bar{padding:8px 12px calc(8px + var(--safe-bottom))}
}