/* 证件照像素调整 · 移动端优先、零依赖 */
*, *::before, *::after { box-sizing: border-box; }

/* hidden 属性优先于类里的 display（如 .bg-row / .field 的 flex） */
[hidden] { display: none !important; }

:root {
  --ink: #2d3436;
  --muted: #7a8794;
  --line: #e3ebf3;
  --card: #ffffff;
  --primary: #438edb;
  --primary-d: #2f74bb;
  --bg: #eef4fb;
  --radius: 16px;
  --shadow: 0 8px 22px rgba(52, 106, 168, 0.12);
  /* 参考线双色：浅底看深色层，深底看浅色层 */
  --guide-dark: rgba(17, 25, 38, 0.78);
  --guide-lite: rgba(255, 255, 255, 0.98);
}

html { -webkit-text-size-adjust: 100%; }

body {
  margin: 0;
  font-family: "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", "Noto Sans CJK SC", -apple-system, "Helvetica Neue", sans-serif;
  color: var(--ink);
  background: linear-gradient(180deg, #f3f8ff 0%, #e9f1fb 100%);
  min-height: 100vh;
  -webkit-tap-highlight-color: transparent;
}

.app {
  max-width: 520px;
  margin: 0 auto;
  padding: 14px 12px calc(24px + env(safe-area-inset-bottom, 0px));
}

/* ---------- 顶部 ---------- */
.topbar { text-align: center; margin-bottom: 10px; }
.topbar h1 { margin: 0; font-size: clamp(19px, 5.4vw, 23px); font-weight: 800; letter-spacing: 1px; }
.privacy {
  margin: 7px auto 0;
  display: inline-block;
  font-size: 0.8rem;
  color: #2f74bb;
  background: #e2eefb;
  border-radius: 999px;
  padding: 5px 13px;
}

/* ---------- 步骤条 ---------- */
.steps { display: flex; gap: 8px; margin: 12px 0; }
.step {
  flex: 1;
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 6px;
  min-height: 48px;
  padding: 8px 6px;
  border: 1px solid var(--line);
  border-radius: 12px;
  background: var(--card);
  color: var(--muted);
  font-size: 0.95rem;
  font-weight: 700;
  cursor: pointer;
}
.step .idx {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 22px; height: 22px;
  border-radius: 50%;
  background: var(--line);
  color: var(--muted);
  font-size: 0.8rem;
}
.step.active { color: #fff; background: var(--primary); border-color: var(--primary); }
.step.active .idx { background: rgba(255, 255, 255, 0.3); color: #fff; }
.step.done { color: var(--primary-d); border-color: #bcd8f5; }
.step.done .idx { background: var(--primary); color: #fff; }
.step:disabled { opacity: 0.55; cursor: default; }

/* ---------- 面板 ---------- */
.panel[hidden] { display: none; }

/* ---------- 大按钮 ---------- */
.big-btn {
  display: block;
  width: 100%;
  min-height: 56px;
  padding: 14px 18px;
  margin-bottom: 12px;
  border: none;
  border-radius: var(--radius);
  font-size: 1.1rem;
  font-weight: 800;
  color: #fff;
  background: linear-gradient(180deg, #5aa2e8, var(--primary));
  box-shadow: 0 4px 0 var(--primary-d), var(--shadow);
  cursor: pointer;
  touch-action: manipulation;
}
.big-btn.ghost {
  color: var(--primary-d);
  background: #fff;
  border: 2px solid #bcd8f5;
  box-shadow: var(--shadow);
}
.big-btn:active { transform: translateY(2px); }
.pick { padding: 6px 0; }
.hint { color: var(--muted); font-size: 0.9rem; text-align: center; line-height: 1.6; }
.error { color: #c0392b; font-size: 0.92rem; margin: 8px 0 0; line-height: 1.5; }

/* ---------- 目标尺寸（步骤 2 顶部：紧凑一行） ---------- */
.size-bar { display: flex; align-items: center; gap: 8px; margin-bottom: 8px; }
.size-bar-label {
  flex: none;
  color: #4d6a8a;
  font-size: 0.92rem;
  font-weight: 700;
  white-space: nowrap;
}
.size-bar select {
  flex: 1 1 auto;
  min-width: 0;
  min-height: 52px;
  padding: 10px 12px;
  font-size: 1rem;
  border: 1px solid var(--line);
  border-radius: 12px;
  background: #fff;
  color: var(--ink);
}
/* 自定义输入挤进同一行，与下拉框共享宽度 */
.size-bar .custom-size { flex: 2 1 0; min-width: 0; margin-bottom: 0; }
.size-bar .custom-size input { min-height: 52px; padding: 10px 6px; }
/* 自定义模式下标签让位，保证 375px 一行不换行、不溢出 */
.size-bar:has(#customSize:not([hidden])) .size-bar-label { display: none; }

/* 换尺寸后的轻提示（低调、不遮挡取景框） */
.resize-notice {
  margin: 0 0 10px;
  padding: 7px 11px;
  border-radius: 10px;
  background: rgba(67, 142, 219, 0.1);
  color: #4d6a8a;
  font-size: 0.82rem;
  line-height: 1.5;
}
.resize-notice[hidden] { display: none; }

/* ---------- 模式分段控件 ---------- */
.seg { display: flex; gap: 6px; background: #dfeaf7; border-radius: 14px; padding: 4px; }
.seg-btn {
  flex: 1;
  min-height: 44px;
  border: none;
  border-radius: 11px;
  background: transparent;
  color: #4d6a8a;
  font-size: 0.98rem;
  font-weight: 700;
  cursor: pointer;
  touch-action: manipulation;
}
.seg-btn.active { background: #fff; color: var(--primary-d); box-shadow: 0 2px 6px rgba(52, 106, 168, 0.18); }
.mode-tip { margin: 8px 2px 10px; color: var(--muted); font-size: 0.88rem; line-height: 1.5; }

/* ---------- 底色选择 ---------- */
.bg-row { display: flex; align-items: center; gap: 10px; margin-bottom: 12px; }
.bg-label { color: var(--muted); font-size: 0.9rem; }
.swatch {
  width: 44px; height: 44px;
  border-radius: 12px;
  border: 2px solid var(--line);
  cursor: pointer;
  padding: 0;
}
.swatch.white { background: #ffffff; }
.swatch.blue { background: #438edb; }
.swatch.red { background: #d9001b; }
.swatch.active { border-color: var(--primary); box-shadow: 0 0 0 3px rgba(67, 142, 219, 0.25); }

/* ---------- 取景框 ---------- */
.stage { position: relative; display: flex; flex-direction: column; align-items: center; }
.viewfinder {
  position: relative;
  width: 100%;
  background: #f0f4f8;
  border-radius: 12px;
  overflow: hidden;
  touch-action: none;
  user-select: none;
  -webkit-user-select: none;
  box-shadow: inset 0 0 0 1px rgba(45, 52, 54, 0.15);
  cursor: grab;
}
.viewfinder:active { cursor: grabbing; }
.viewfinder canvas { display: block; width: 100%; height: 100%; pointer-events: none; }

.guides { position: absolute; inset: 0; pointer-events: none; overflow: hidden; }
.guides[hidden] { display: none; }
.guides .line { position: absolute; }

/* 参考线：2px 双层虚线（上层深色、下层浅色）。
   白底看得到深色层，黑底/深色头发看得到浅色层，中间色调两层都在，任何底图上都清晰。 */
.hline,
.vline {
  background-repeat: repeat-x, repeat-x;
  background-size: 100% 1px, 100% 1px;
  background-position: 0 0, 0 1px;
  background-image:
    repeating-linear-gradient(90deg, var(--guide-dark) 0 7px, rgba(0, 0, 0, 0) 7px 11px),
    repeating-linear-gradient(90deg, var(--guide-lite) 0 7px, rgba(255, 255, 255, 0) 7px 11px);
}
.vline {
  background-repeat: repeat-y, repeat-y;
  background-size: 1px 100%, 1px 100%;
  background-position: 0 0, 1px 0;
  background-image:
    repeating-linear-gradient(180deg, var(--guide-dark) 0 7px, rgba(0, 0, 0, 0) 7px 11px),
    repeating-linear-gradient(180deg, var(--guide-lite) 0 7px, rgba(255, 255, 255, 0) 7px 11px);
}
.hline { left: 0; right: 0; height: 2px; }
.vline { top: 0; bottom: 0; width: 2px; }
.g-top { top: 8%; }
.g-eye { top: 45%; }
.g-chin { top: 78%; }
.g-center { left: 50%; }

/* 框内小标签：靠左放置，避免压住参考线中段和人像 */
.guide-text,
.vf-hint {
  position: absolute;
  left: 8px;
  display: block;
  padding: 3px 9px;
  border-radius: 999px;
  font-size: 0.7rem;
  line-height: 1.45;
  white-space: nowrap;
  color: #fff;
  background: rgba(21, 30, 44, 0.58);
  box-shadow: 0 1px 3px rgba(0, 0, 0, 0.28);
}
.guide-text { top: 6px; }
/* 手势提示紧跟在「对齐」标签下方：取景框顶部是留白区，不会被底部浮动条压住 */
.vf-hint {
  top: 32px;
  pointer-events: none;
  color: #3d5871;
  background: rgba(255, 255, 255, 0.88);
  box-shadow: 0 1px 3px rgba(0, 0, 0, 0.18);
}
/* 参考线关掉后，「单指拖动」提示补到框顶，不留空洞 */
.viewfinder:has(#guides[hidden]) .vf-hint { top: 6px; }

/* ---------- 参考线图例 + 开关（一行放在取景框下方） ---------- */
.guide-bar {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  justify-content: center;
  gap: 6px 8px;
  width: 100%;
  margin-top: 10px;
}
.legend {
  display: inline-flex;
  align-items: center;
  gap: 5px;
  min-height: 34px;
  padding: 0 8px;
  border-radius: 9px;
  background: rgba(67, 142, 219, 0.08);
  color: #4d6a8a;
  font-size: 0.72rem;
  font-weight: 700;
  white-space: nowrap;
}
.legend i {
  width: 14px;
  height: 2px;
  border-radius: 1px;
  background-repeat: repeat-x, repeat-x;
  background-size: 100% 1px, 100% 1px;
  background-position: 0 0, 0 1px;
  background-image:
    repeating-linear-gradient(90deg, var(--guide-dark) 0 4px, rgba(0, 0, 0, 0) 4px 7px),
    repeating-linear-gradient(90deg, var(--guide-lite) 0 4px, rgba(255, 255, 255, 0) 4px 7px);
}
.stage:has(#guides[hidden]) .legend { opacity: 0.42; }

.guides-toggle {
  min-height: 44px;
  padding: 0 14px;
  border: 1px solid var(--line);
  border-radius: 999px;
  background: #fff;
  color: var(--primary-d);
  font-size: 0.8rem;
  font-weight: 700;
  cursor: pointer;
  touch-action: manipulation;
}
.guides-toggle:active { background: #eef4fb; }

/* ---------- 快捷操作 ---------- */
.actions {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 8px;
  margin: 14px 0 10px;
}
.act {
  min-height: 48px;
  padding: 6px 4px;
  border: 1px solid var(--line);
  border-radius: 12px;
  background: #fff;
  color: #3d5871;
  font-size: 0.82rem;
  font-weight: 700;
  cursor: pointer;
  touch-action: manipulation;
}
.act:active { background: #eef4fb; }

/* ---------- 缩放滑杆 ---------- */
.zoom-row { display: flex; flex-direction: column; gap: 6px; margin-bottom: 16px; }
.zoom-label { color: var(--muted); font-size: 0.9rem; }
.zoom-row input[type="range"] { width: 100%; height: 44px; }

/* 滑杆触摸区保持 44px 以上 */
input[type="range"] { min-height: 44px; touch-action: manipulation; }

/* ---------- 底部导航 ---------- */
.nav-row { display: flex; gap: 10px; margin-top: 14px; }
/* 步骤 2：取景框占了一屏，关键动作常驻屏幕底部，家长不用往下找 */
#panel2 .nav-row {
  position: sticky;
  bottom: 0;
  z-index: 20;
  margin-top: 16px;
  padding: 12px 0 calc(6px + env(safe-area-inset-bottom, 0px));
  background: linear-gradient(180deg,
    rgba(238, 244, 251, 0.88) 0%,
    rgba(238, 244, 251, 0.97) 42%,
    rgba(238, 244, 251, 0.99) 100%);
  -webkit-backdrop-filter: blur(6px);
  backdrop-filter: blur(6px);
}
/* 常驻动作条里，「下一步」比「重选照片」更宽更重 */
#panel2 .nav-row .btn.primary { flex: 1.4; }
.btn {
  flex: 1;
  min-height: 52px;
  padding: 12px 12px;
  border: none;
  border-radius: 14px;
  font-size: 1rem;
  font-weight: 800;
  cursor: pointer;
  text-align: center;
  text-decoration: none;
  touch-action: manipulation;
}
.btn.primary { color: #fff; background: linear-gradient(180deg, #5aa2e8, var(--primary)); box-shadow: 0 4px 0 var(--primary-d); }
.btn.primary:disabled { opacity: 0.5; box-shadow: none; }
.btn.ghost { color: var(--primary-d); background: #fff; border: 2px solid #bcd8f5; }
.btn.big { display: block; width: 100%; margin-top: 4px; }
.btn:active { transform: translateY(1px); }

/* ---------- 表单 ---------- */
.field { display: flex; flex-direction: column; gap: 6px; margin-bottom: 14px; }
.field-label { color: #4d6a8a; font-size: 0.92rem; font-weight: 700; }
.field select {
  min-height: 52px;
  padding: 10px 12px;
  font-size: 1rem;
  border: 1px solid var(--line);
  border-radius: 12px;
  background: #fff;
  color: var(--ink);
}
.field input[type="range"] { width: 100%; height: 44px; }

.custom-size { display: flex; align-items: center; gap: 8px; margin-bottom: 6px; }
.custom-size[hidden] { display: none; }
.custom-size input {
  flex: 1;
  min-width: 0;
  min-height: 52px;
  padding: 10px;
  font-size: 1rem;
  text-align: center;
  border: 1px solid var(--line);
  border-radius: 12px;
  background: #fff;
}
.custom-size .times { font-weight: 800; color: var(--muted); }
.custom-size .unit { color: var(--muted); font-size: 0.9rem; }

/* ---------- 步骤 3：尺寸只读摘要 + 「改尺寸」 ---------- */
.size-summary {
  display: flex;
  align-items: center;
  gap: 8px;
  margin-bottom: 14px;
  padding: 10px 12px;
  border: 1px solid var(--line);
  border-radius: 12px;
  background: #f7fbff;
}
.size-summary-label { color: var(--muted); font-size: 0.9rem; }
.size-summary-val { color: var(--ink); font-size: 1rem; }
.size-edit {
  margin-left: auto;
  min-height: 40px;
  padding: 0 14px;
  border: 1px solid #bcd8f5;
  border-radius: 999px;
  background: #fff;
  color: var(--primary-d);
  font-size: 0.85rem;
  font-weight: 700;
  cursor: pointer;
  touch-action: manipulation;
}
.size-edit:active { background: #eef4fb; }

/* ---------- 结果 ---------- */
.result { margin-top: 16px; text-align: center; }
.result[hidden] { display: none; }
.result img {
  max-width: 100%;
  max-height: 40vh;
  border-radius: 10px;
  border: 1px solid var(--line);
  background: #fff;
  box-shadow: var(--shadow);
}
.result-info { margin: 12px 0 4px; font-weight: 800; color: #2d3436; }
.result-ok { margin: 0 0 12px; color: #1e9e5e; font-weight: 700; }
#downloadBtn { margin-bottom: 4px; }

/* ---------- 生成前的占位说明（生成后自动隐藏） ---------- */
.result-ph {
  margin-top: 16px;
  padding: 18px 16px;
  border: 2px dashed #c8dcf2;
  border-radius: 14px;
  background: rgba(255, 255, 255, 0.6);
  text-align: center;
}
/* 结果区出现后，占位说明自动让位（纯 CSS 联动，不改动脚本） */
#result:not([hidden]) ~ .result-ph { display: none; }

.result-ph .ph-emoji { display: block; font-size: 1.6rem; line-height: 1; }
.result-ph .ph-title { margin: 8px 0 4px; font-size: 0.95rem; font-weight: 800; color: #4d6a8a; }
.result-ph .ph-sub { margin: 0; color: var(--muted); font-size: 0.82rem; line-height: 1.6; }

.footer { margin-top: 20px; text-align: center; color: var(--muted); font-size: 0.82rem; line-height: 1.5; }

/* 手机上用不到「拖进来 / Ctrl+V」这类电脑操作说明 */
.hint-pc { display: none; }

/* ---------- 宽屏微调 ---------- */
@media (min-width: 640px) {
  .app { max-width: 560px; }
  .actions { grid-template-columns: repeat(4, 1fr); }
  .hint-pc { display: block; }
}