/* ============================================================
   QRMaker.top — 站点样式
   设计基调：浅紫罗兰背景 + 白色卡片 + 深紫主色 (#6d28d9)
   布局：页头 / Hero / 工具双栏 / 内容区 / 页脚，移动端单栏
   ============================================================ */

:root {
  --primary: #6d28d9;
  --primary-dark: #5b21b6;
  --primary-soft: #ede9fe;
  --accent: #8b5cf6;
  --bg: #f6f5fb;
  --card: #ffffff;
  --text: #211d33;
  --text-soft: #5c5875;
  --border: #e4e1f2;
  --success: #15803d;
  --success-soft: #dcfce7;
  --warn: #b45309;
  --warn-soft: #fef3c7;
  --danger: #b91c1c;
  --radius: 14px;
  --shadow: 0 1px 3px rgba(35, 25, 90, .07), 0 6px 18px rgba(35, 25, 90, .05);
}

* { box-sizing: border-box; margin: 0; padding: 0; }

html { scroll-behavior: smooth; }

body {
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", "Noto Sans CJK SC", sans-serif;
  background: var(--bg);
  color: var(--text);
  line-height: 1.6;
  -webkit-font-smoothing: antialiased;
}

.wrap { max-width: 1180px; margin: 0 auto; padding: 0 20px; }

a { color: var(--primary); text-decoration: none; }
a:hover { text-decoration: underline; }

/* ---------------- 页头 ---------------- */
.site-header {
  background: var(--card);
  border-bottom: 1px solid var(--border);
  position: sticky;
  top: 0;
  z-index: 50;
}
.header-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 60px;
  gap: 12px;
}
.brand {
  display: flex;
  align-items: center;
  gap: 9px;
  font-size: 20px;
  font-weight: 800;
  color: var(--text);
  letter-spacing: -.3px;
}
.brand:hover { text-decoration: none; }
.brand-name em { font-style: normal; color: var(--primary); }
.brand-icon { display: block; flex: none; }

.site-nav { display: flex; align-items: center; gap: 18px; }
.site-nav a {
  color: var(--text-soft);
  font-size: 14.5px;
  font-weight: 500;
}
.site-nav a:hover { color: var(--primary); text-decoration: none; }

.lang-select {
  appearance: none;
  -webkit-appearance: none;
  border: 1px solid var(--border);
  background: var(--bg) url("data:image/svg+xml;charset=utf8,%3Csvg xmlns='http://www.w3.org/2000/svg' width='10' height='6'%3E%3Cpath d='M1 1l4 4 4-4' stroke='%235c5875' stroke-width='1.6' fill='none' stroke-linecap='round'/%3E%3C/svg%3E") no-repeat right 10px center;
  border-radius: 9px;
  padding: 6px 28px 6px 12px;
  font-size: 13.5px;
  color: var(--text);
  cursor: pointer;
}
.lang-select:focus { outline: 2px solid var(--accent); outline-offset: 1px; }

/* ---------------- Hero ---------------- */
.hero { text-align: center; padding: 46px 0 30px; }
.hero h1 {
  font-size: 40px;
  font-weight: 800;
  letter-spacing: -.8px;
  line-height: 1.18;
}
.hero-sub {
  max-width: 760px;
  margin: 14px auto 0;
  font-size: 17px;
  color: var(--text-soft);
}

/* ---------------- 工具区布局 ---------------- */
.tool-grid {
  display: grid;
  grid-template-columns: minmax(0, 1fr) 400px;
  gap: 22px;
  align-items: start;
  margin-bottom: 26px;
}
.tool-left { display: flex; flex-direction: column; gap: 18px; min-width: 0; }

.panel-card {
  background: var(--card);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  box-shadow: var(--shadow);
  padding: 20px 22px;
}
.panel-title {
  font-size: 15.5px;
  font-weight: 700;
  margin-bottom: 14px;
  display: flex;
  align-items: center;
  gap: 8px;
}
.panel-title .step-badge {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 22px;
  height: 22px;
  border-radius: 7px;
  background: var(--primary-soft);
  color: var(--primary);
  font-size: 12.5px;
  font-weight: 800;
  flex: none;
}
.panel-hint { font-size: 13px; color: var(--text-soft); font-weight: 400; margin-left: auto; }

/* ---------------- 内容类型 chips ---------------- */
.type-chips {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  margin-bottom: 14px;
}
.type-chip {
  border: 1.5px solid var(--border);
  background: var(--card);
  color: var(--text-soft);
  border-radius: 999px;
  padding: 7px 15px;
  font-size: 13.5px;
  font-weight: 600;
  cursor: pointer;
  transition: all .15s;
  display: inline-flex;
  align-items: center;
  gap: 6px;
}
.type-chip:hover { border-color: var(--accent); color: var(--primary); }
.type-chip.active {
  background: var(--primary);
  border-color: var(--primary);
  color: #fff;
}
.type-chip svg { flex: none; }

/* ---------------- 表单控件 ---------------- */
.field { margin-bottom: 12px; }
.field:last-child { margin-bottom: 0; }
.field label {
  display: block;
  font-size: 13.5px;
  font-weight: 600;
  color: var(--text-soft);
  margin-bottom: 5px;
}
.text-input,
.textarea,
.select-input {
  width: 100%;
  border: 1.5px solid var(--border);
  border-radius: 10px;
  padding: 10px 13px;
  font-size: 15px;
  font-family: inherit;
  color: var(--text);
  background: #fff;
  transition: border-color .15s, box-shadow .15s;
}
.text-input:focus,
.textarea:focus,
.select-input:focus {
  outline: none;
  border-color: var(--accent);
  box-shadow: 0 0 0 3px var(--primary-soft);
}
.textarea { min-height: 110px; resize: vertical; line-height: 1.55; }
.select-input {
  appearance: none;
  -webkit-appearance: none;
  background: #fff url("data:image/svg+xml;charset=utf8,%3Csvg xmlns='http://www.w3.org/2000/svg' width='10' height='6'%3E%3Cpath d='M1 1l4 4 4-4' stroke='%235c5875' stroke-width='1.6' fill='none' stroke-linecap='round'/%3E%3C/svg%3E") no-repeat right 12px center;
  padding-right: 32px;
}
.field-row { display: grid; grid-template-columns: 1fr 1fr; gap: 12px; }
.char-count { font-size: 12.5px; color: var(--text-soft); text-align: right; margin-top: 4px; }
.char-count.warn { color: var(--warn); font-weight: 600; }

.checkbox-row {
  display: flex;
  align-items: center;
  gap: 8px;
  font-size: 14px;
  color: var(--text);
  cursor: pointer;
  user-select: none;
}
.checkbox-row input { width: 16px; height: 16px; accent-color: var(--primary); cursor: pointer; }

/* ---------------- 颜色设置 ---------------- */
.color-grid { display: grid; grid-template-columns: 1fr 1fr; gap: 16px; }
.color-block .color-head {
  display: flex;
  align-items: center;
  justify-content: space-between;
  margin-bottom: 8px;
}
.color-block .color-name { font-size: 13.5px; font-weight: 600; color: var(--text-soft); }
.color-control { display: flex; align-items: center; gap: 9px; }
.color-swatch-input {
  width: 42px;
  height: 42px;
  border: 1.5px solid var(--border);
  border-radius: 10px;
  padding: 2px;
  background: #fff;
  cursor: pointer;
  flex: none;
}
.color-swatch-input::-webkit-color-swatch-wrapper { padding: 2px; }
.color-swatch-input::-webkit-color-swatch { border: none; border-radius: 7px; }
.color-swatch-input:disabled { opacity: .35; cursor: not-allowed; }
.hex-input {
  width: 96px;
  border: 1.5px solid var(--border);
  border-radius: 10px;
  padding: 9px 10px;
  font-size: 14px;
  font-family: ui-monospace, SFMono-Regular, Menlo, Consolas, monospace;
  text-transform: uppercase;
  color: var(--text);
}
.hex-input:focus { outline: none; border-color: var(--accent); box-shadow: 0 0 0 3px var(--primary-soft); }
.preset-row { display: flex; gap: 7px; margin-top: 10px; flex-wrap: wrap; }
.preset-dot {
  width: 26px;
  height: 26px;
  border-radius: 50%;
  border: 2px solid #fff;
  box-shadow: 0 0 0 1.5px var(--border);
  cursor: pointer;
  padding: 0;
  transition: transform .12s;
}
.preset-dot:hover { transform: scale(1.14); box-shadow: 0 0 0 2px var(--accent); }
.transparent-row { margin-top: 10px; }

/* ---------------- Logo 上传 ---------------- */
.logo-drop {
  border: 2px dashed var(--border);
  border-radius: 12px;
  padding: 20px;
  text-align: center;
  cursor: pointer;
  transition: all .15s;
  background: #fbfaff;
}
.logo-drop:hover, .logo-drop.dragover { border-color: var(--accent); background: var(--primary-soft); }
.logo-drop-icon { margin-bottom: 6px; }
.logo-drop-text { font-size: 14px; font-weight: 600; color: var(--text-soft); }
.logo-drop-sub { font-size: 12.5px; color: var(--text-soft); margin-top: 2px; }
.logo-preview-row {
  display: flex;
  align-items: center;
  gap: 14px;
}
.logo-thumb {
  width: 56px;
  height: 56px;
  border-radius: 12px;
  border: 1.5px solid var(--border);
  object-fit: contain;
  background: #fff;
  flex: none;
}
.logo-info { flex: 1; min-width: 0; }
.logo-name {
  font-size: 13.5px;
  font-weight: 600;
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
}
.logo-remove {
  border: none;
  background: none;
  color: var(--danger);
  font-size: 13px;
  font-weight: 600;
  cursor: pointer;
  padding: 4px 0;
}
.logo-remove:hover { text-decoration: underline; }
.range-row { display: flex; align-items: center; gap: 12px; margin-top: 14px; }
.range-row label { font-size: 13.5px; font-weight: 600; color: var(--text-soft); white-space: nowrap; }
.range-input { flex: 1; accent-color: var(--primary); cursor: pointer; }
.range-val { font-size: 13px; font-weight: 700; color: var(--primary); min-width: 42px; text-align: right; }
.logo-note {
  font-size: 12.5px;
  color: var(--warn);
  background: var(--warn-soft);
  border-radius: 8px;
  padding: 8px 11px;
  margin-top: 12px;
  line-height: 1.45;
}

/* ---------------- 预览卡（右侧 sticky） ---------------- */
.preview-card {
  position: sticky;
  top: 78px;
  background: var(--card);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  box-shadow: var(--shadow);
  padding: 22px;
  text-align: center;
}
.preview-stage {
  position: relative;
  border: 1.5px solid var(--border);
  border-radius: 12px;
  overflow: hidden;
  background:
    repeating-conic-gradient(#f3f2fa 0% 25%, #ffffff 0% 50%) 0 0 / 18px 18px;
  display: flex;
  align-items: center;
  justify-content: center;
  min-height: 280px;
}
.preview-stage canvas {
  display: block;
  max-width: 100%;
  height: auto !important;
}
.preview-empty {
  position: absolute;
  inset: 0;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  gap: 8px;
  color: var(--text-soft);
  font-size: 14px;
  padding: 20px;
}
.preview-badge {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  font-size: 12.5px;
  font-weight: 700;
  color: var(--success);
  background: var(--success-soft);
  border-radius: 999px;
  padding: 4px 12px;
  margin-top: 14px;
}
.size-select-row {
  display: flex;
  align-items: center;
  gap: 10px;
  margin: 16px 0 12px;
  text-align: left;
}
.size-select-row label { font-size: 13.5px; font-weight: 600; color: var(--text-soft); white-space: nowrap; }
.size-select-row .select-input { padding: 8px 30px 8px 11px; font-size: 14px; }

.download-row { display: grid; grid-template-columns: 1fr 1fr; gap: 10px; }
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  border: none;
  border-radius: 11px;
  padding: 12px 16px;
  font-size: 15px;
  font-weight: 700;
  cursor: pointer;
  transition: all .15s;
  font-family: inherit;
}
.btn-primary { background: var(--primary); color: #fff; }
.btn-primary:hover { background: var(--primary-dark); transform: translateY(-1px); }
.btn-outline {
  background: #fff;
  color: var(--primary);
  border: 1.5px solid var(--primary);
}
.btn-outline:hover { background: var(--primary-soft); }
.btn:disabled { opacity: .45; cursor: not-allowed; transform: none !important; }
.copy-link {
  margin-top: 12px;
  width: 100%;
  border: none;
  background: none;
  color: var(--text-soft);
  font-size: 13.5px;
  font-weight: 600;
  cursor: pointer;
  font-family: inherit;
  padding: 6px;
}
.copy-link:hover { color: var(--primary); }

/* ---------------- 打印排版（屏幕端） ---------------- */
.print-box {
  margin-top: 18px;
  padding-top: 16px;
  border-top: 1px dashed var(--line, #e3e0f0);
}
.print-title {
  font-size: 15px;
  font-weight: 700;
  margin: 0 0 12px;
  color: var(--text);
}
.print-btn {
  margin-top: 12px;
  width: 100%;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
}
.field-note {
  font-size: 12.5px;
  color: var(--text-soft);
  margin-top: 4px;
  line-height: 1.5;
}

/* ---------------- 打印页（A4 网格，仅打印时可见） ---------------- */
#printSheet { display: none; }

@media print {
  @page { size: A4; margin: 10mm; }

  /* 隐藏页面其他全部内容 */
  body > *:not(#printSheet) { display: none !important; }

  #printSheet {
    display: grid !important;
    width: 190mm;          /* A4 210mm - 2×10mm 页边距 */
    height: 277mm;
    gap: 0;
    align-content: stretch;
    justify-content: stretch;
  }
  #printSheet.grid-2x2 { grid-template-columns: repeat(2, 1fr); grid-template-rows: repeat(2, 1fr); }
  #printSheet.grid-3x3 { grid-template-columns: repeat(3, 1fr); grid-template-rows: repeat(3, 1fr); }
  #printSheet.grid-4x4 { grid-template-columns: repeat(4, 1fr); grid-template-rows: repeat(4, 1fr); }

  .print-cell {
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    padding: 6mm;
    box-sizing: border-box;
    overflow: hidden;
  }
  #printSheet.with-guides .print-cell {
    border: 0.3mm dashed #9a94b8; /* 裁剪参考线 */
  }
  .print-cell img {
    max-width: 100%;
    max-height: 78%;
    object-fit: contain;
    image-rendering: pixelated; /* 保持 QR 边缘锐利 */
  }
  .print-cell-caption {
    margin: 4mm 0 0;
    font-size: 11pt;
    font-weight: 600;
    color: #1c1a2e;
    text-align: center;
    word-break: break-word;
    font-family: inherit;
  }
}
.copied-toast {
  position: fixed;
  bottom: 26px;
  left: 50%;
  transform: translateX(-50%) translateY(80px);
  background: var(--text);
  color: #fff;
  font-size: 14px;
  font-weight: 600;
  padding: 10px 22px;
  border-radius: 999px;
  opacity: 0;
  transition: all .3s;
  pointer-events: none;
  z-index: 100;
}
.copied-toast.show { opacity: 1; transform: translateX(-50%) translateY(0); }

/* ---------------- 内容区 ---------------- */
.content-section {
  background: var(--card);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  box-shadow: var(--shadow);
  padding: 30px 34px;
  margin-bottom: 22px;
}
.content-section h2 {
  font-size: 24px;
  font-weight: 800;
  letter-spacing: -.4px;
  margin-bottom: 14px;
}
.content-section p { color: var(--text-soft); margin-bottom: 12px; font-size: 15.5px; }
.content-section p:last-child { margin-bottom: 0; }
.howto-list { padding-left: 22px; color: var(--text-soft); font-size: 15.5px; }
.howto-list li { margin-bottom: 9px; }
.howto-list li::marker { color: var(--primary); font-weight: 700; }

.feature-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 18px;
  margin-top: 18px;
}
.feature-item {
  border: 1px solid var(--border);
  border-radius: 12px;
  padding: 18px;
  background: #fbfaff;
}
.feature-item h3 { font-size: 16px; font-weight: 700; margin-bottom: 6px; }
.feature-item p { font-size: 14px; color: var(--text-soft); margin: 0; }

/* ---------------- FAQ ---------------- */
.faq-list { display: flex; flex-direction: column; gap: 10px; margin-top: 16px; }
.faq-item {
  border: 1px solid var(--border);
  border-radius: 11px;
  background: #fbfaff;
  overflow: hidden;
}
.faq-item summary {
  cursor: pointer;
  padding: 14px 18px;
  font-size: 15px;
  font-weight: 600;
  list-style: none;
  position: relative;
  padding-right: 40px;
  user-select: none;
}
.faq-item summary::-webkit-details-marker { display: none; }
.faq-item summary::after {
  content: "+";
  position: absolute;
  right: 16px;
  top: 50%;
  transform: translateY(-50%);
  font-size: 20px;
  font-weight: 400;
  color: var(--primary);
  transition: transform .2s;
}
.faq-item[open] summary::after { content: "−"; }
.faq-item p { padding: 0 18px 15px; font-size: 14.5px; color: var(--text-soft); }

/* ---------------- 页脚 ---------------- */
.site-footer {
  border-top: 1px solid var(--border);
  background: var(--card);
  margin-top: 34px;
  padding: 28px 0 34px;
}
.footer-inner { text-align: center; }
.footer-inner p { color: var(--text-soft); font-size: 14px; }
.footer-nav { margin: 10px 0; display: flex; justify-content: center; gap: 22px; }
.footer-nav a { color: var(--text-soft); font-size: 14px; }
.footer-nav a:hover { color: var(--primary); }
.disclaimer { font-size: 12.5px !important; opacity: .8; max-width: 640px; margin: 0 auto; }

/* ---------------- 响应式 ---------------- */
@media (max-width: 980px) {
  .tool-grid { grid-template-columns: 1fr; }
  .preview-card { position: static; } /* 移动端按 DOM 顺序：输入在前，预览结果在后 */
  .preview-stage { min-height: 240px; }
  .feature-grid { grid-template-columns: 1fr 1fr; }
  .hero h1 { font-size: 31px; }
  .hero { padding: 34px 0 24px; }
}
@media (max-width: 640px) {
  .hero h1 { font-size: 26px; }
  .hero-sub { font-size: 15px; }
  .field-row { grid-template-columns: 1fr; }
  .color-grid { grid-template-columns: 1fr; }
  .feature-grid { grid-template-columns: 1fr; }
  .content-section { padding: 22px 20px; }
  .content-section h2 { font-size: 20px; }
  .site-nav { gap: 12px; }
  .site-nav a { font-size: 13.5px; }
  .brand { font-size: 18px; }
  .download-row { grid-template-columns: 1fr; }
  .header-inner { height: 54px; }
}