/* 全屏 + 安全区 */
:root{
  --safe-top: env(safe-area-inset-top, 0px);
  --safe-right: env(safe-area-inset-right, 0px);
  --safe-bottom: env(safe-area-inset-bottom, 0px);
  --safe-left: env(safe-area-inset-left, 0px);

  --fg: #fff;
  --bg: #000;
  --panel: rgba(0,0,0,.45);
  --panel2: rgba(0,0,0,.65);
  --border: rgba(255,255,255,.12);

  --btn: rgba(20,20,20,.7);
  --btn-b: rgba(255,255,255,.14);
}

*{ box-sizing: border-box; }
html,body{ height:100%; margin:0; padding:0; background: var(--bg); color: var(--fg); font-family: -apple-system,BlinkMacSystemFont,"Segoe UI",system-ui; }
body{ overscroll-behavior: none; }

.app{
  position: fixed;
  inset: 0;
  background: var(--bg);
}

.stage{
  position: fixed;
  inset: 0;
  width: 100vw;
  height: 100dvh;
  background: #000;
  overflow: hidden;
}

/* 相机画面 */
video{
  position:absolute;
  inset:0;
  width: 100%;
  height: 100%;
  object-fit: cover;
  transform: translateZ(0);
}

/* 遮罩 */
.overlay-wrap{
  position:absolute;
  left: 50%;
  top: 50%;
  transform: translate(-50%,-50%);
  transform-origin: center center;
  user-select:none;
  touch-action:none; /* 关键：让手势不触发页面滚动/缩放 */
  cursor: grab;
  will-change: transform, opacity;
}
.overlay-wrap:active{ cursor: grabbing; }
.overlay-wrap img{
  display:block;
  max-width: 86vw;
  max-height: 70dvh;
  pointer-events:none;
}

/* 顶部控制条 */
.topbar{
  position: absolute;
  left: 0; right: 0;
  top: 0;
  padding: calc(var(--safe-top) + 10px) calc(var(--safe-right) + 12px) 10px calc(var(--safe-left) + 12px);
  pointer-events: none; /* 只让内部可点 */
}
.topbar-inner{
  pointer-events: auto;
  display:flex;
  gap:10px;
  align-items:center;
  padding:10px 12px;
  border-radius: 16px;
  background: var(--panel);
  border: 1px solid var(--border);
  backdrop-filter: blur(10px);
}
.topbar .label{ font-size: 13px; opacity:.92; }
.topbar .value{ font-size: 13px; opacity:.9; min-width: 42px; text-align:right; }
.topbar input[type="range"]{ width: 150px; }

.icon-btn{
  border: 1px solid var(--btn-b);
  background: var(--btn);
  color: var(--fg);
  border-radius: 14px;
  padding: 8px 10px;
  font-size: 14px;
}

/* 底部栏 */
.bottombar{
  position:absolute;
  left:0; right:0;
  bottom: 0;
  padding: 12px calc(var(--safe-right) + 16px) calc(var(--safe-bottom) + 16px) calc(var(--safe-left) + 16px);
  display:flex;
  align-items:flex-end;
  justify-content: space-between;
  gap: 12px;
}

.shutter{
  width: 78px;
  height: 78px;
  border-radius: 999px;
  border: 2px solid rgba(255,255,255,.9);
  background: rgba(255,255,255,.08);
  display:grid;
  place-items:center;
  padding:0;
}
.shutter:disabled{ opacity:.5; }
.shutter-inner{
  width: 62px;
  height: 62px;
  border-radius: 999px;
  background: rgba(255,255,255,.88);
}

.fab{
  width: 56px;
  height: 56px;
  border-radius: 16px;
  border: 1px solid var(--btn-b);
  background: var(--panel2);
  color: var(--fg);
  font-size: 28px;
  line-height: 1;
  display:grid;
  place-items:center;
}

.thumb{
  width: 56px;
  height: 56px;
  border-radius: 14px;
  border: 1px solid rgba(255,255,255,.25);
  overflow:hidden;
  background: rgba(255,255,255,.08);
}
.thumb img{
  width:100%;
  height:100%;
  object-fit: cover;
  display:block;
}

/* 隐藏的 file input */
.file{ display:none; }

/* 启动引导 */
.start{
  position:absolute;
  inset:0;
  display:flex;
  align-items:center;
  justify-content:center;
  padding: 16px;
  background: radial-gradient(ellipse at center, rgba(0,0,0,.45), rgba(0,0,0,.75));
}
.start-card{
  width: min(520px, 92vw);
  border-radius: 18px;
  border: 1px solid var(--border);
  background: rgba(20,20,20,.7);
  backdrop-filter: blur(12px);
  padding: 16px;
}
.start-title{ font-size: 16px; font-weight: 700; margin-bottom: 8px; }
.start-text{ font-size: 13px; opacity:.9; line-height:1.5; margin-bottom: 12px; }
.start-btn{
  width: 100%;
  border-radius: 16px;
  border: 1px solid rgba(255,255,255,.25);
  background: rgba(255,255,255,.12);
  color: var(--fg);
  padding: 12px 14px;
  font-size: 16px;
}

/* Modal */
.modal{
  position: fixed;
  inset: 0;
  display:none;
}
.modal.show{ display:block; }
.modal-backdrop{
  position:absolute;
  inset:0;
  background: rgba(0,0,0,.55);
  backdrop-filter: blur(6px);
}
.modal-sheet{
  position:absolute;
  left:0; right:0;
  bottom:0;
  padding: 10px calc(var(--safe-right) + 12px) calc(var(--safe-bottom) + 12px) calc(var(--safe-left) + 12px);
  border-top-left-radius: 18px;
  border-top-right-radius: 18px;
  background: rgba(18,18,18,.9);
  border-top: 1px solid var(--border);
}
.modal-top{
  display:flex;
  align-items:center;
  justify-content: space-between;
  gap: 10px;
  margin-bottom: 10px;
}
.modal-actions{ display:flex; gap: 10px; }
.modal-btn{
  display:inline-block;
  border: 1px solid var(--btn-b);
  background: var(--btn);
  color: var(--fg);
  border-radius: 14px;
  padding: 10px 12px;
  font-size: 14px;
  text-decoration:none;
}
.modal-btn:disabled{ opacity:.55; }
#previewImg{
  width: 100%;
  max-height: 70dvh;
  object-fit: contain;
  border-radius: 16px;
  background: rgba(255,255,255,.05);
}
.modal-hint{
  margin-top: 10px;
  font-size: 12px;
  opacity: .85;
  line-height: 1.45;
}

.hidden{ display:none; }