/* ==========================================================================
 * 格纸生成器 —— 全站样式
 * 设计基调：纸感暖白 + 墨蓝点缀。低饱和背景让注意力留在预览区的白纸上。
 * ========================================================================== */

:root {
  --bg:          #f5f4f1;
  --surface:     #ffffff;
  --surface-2:   #faf9f7;
  --border:      #e3e0d9;
  --border-2:    #d3cec4;
  --text:        #2b2a28;
  --text-muted:  #7c776d;
  --accent:      #2f5fd0;
  --accent-dark: #2450b8;
  --accent-soft: #eaf0fb;
  --danger:      #c0392b;
  --ok:          #1f7a44;
  --radius:      10px;
  --radius-sm:   7px;
  --shadow-sm:   0 1px 2px rgba(40,35,25,.06), 0 1px 3px rgba(40,35,25,.04);
  --shadow-md:   0 4px 12px rgba(40,35,25,.08), 0 1px 3px rgba(40,35,25,.06);
  --shadow-paper:0 8px 28px rgba(40,35,25,.13), 0 2px 6px rgba(40,35,25,.07);
  --panel-w:     336px;
}

* { box-sizing: border-box; }

/* --------------------------------------------------------------------------
 * 关键规则：让 HTML 的 hidden 属性真正生效。
 *
 * 坑点记录：HTML 的 hidden 属性本质上只是 `display: none`，优先级极低。
 * 一旦某个元素同时命中 .busy{display:flex} 或 .field{display:block}
 * 这类显式声明，hidden 就会被无声覆盖 —— 元素明明 hidden=true 却依然可见、
 * 依然拦截点击。本站曾有 8 个元素栽在这上面，其中 #busy 遮罩覆盖全屏，
 * 导致所有导出按钮点不动。加这条规则一次性解决，且无需逐个改 JS。
 * ------------------------------------------------------------------------ */
[hidden] { display: none !important; }

html, body {
  margin: 0; padding: 0;
  background: var(--bg);
  color: var(--text);
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", "PingFang SC",
               "Hiragino Sans GB", "Microsoft YaHei", sans-serif;
  font-size: 14px;
  line-height: 1.6;
  -webkit-font-smoothing: antialiased;
}

a { color: inherit; text-decoration: none; }

/* ============================ 顶栏 ============================ */
.topbar {
  position: sticky; top: 0; z-index: 50;
  background: rgba(255,255,255,.9);
  backdrop-filter: saturate(180%) blur(12px);
  border-bottom: 1px solid var(--border);
}
.topbar-inner {
  max-width: 1680px; margin: 0 auto;
  padding: 0 20px; height: 60px;
  display: flex; align-items: center; gap: 24px;
}
.brand { display: flex; align-items: center; gap: 10px; font-size: 16px; }
.brand-mark {
  width: 28px; height: 28px; border-radius: 7px;
  object-fit: cover; display: block;
  box-shadow: var(--shadow-sm);
}
.brand-text b { color: var(--accent); font-weight: 650; letter-spacing: .2px; }

.topnav { display: flex; gap: 4px; margin-left: 8px; }
.topnav a {
  padding: 6px 12px; border-radius: var(--radius-sm);
  color: var(--text-muted); font-size: 14px; transition: .15s;
}
.topnav a:hover { background: var(--surface-2); color: var(--text); }
.topnav a.active { color: var(--accent); background: var(--accent-soft); font-weight: 500; }

.topbar-actions { margin-left: auto; display: flex; gap: 8px; }

.menu-toggle {
  display: none; margin-left: auto;
  background: none; border: 1px solid var(--border-2);
  border-radius: var(--radius-sm); padding: 6px 11px;
  font-size: 17px; cursor: pointer; color: var(--text);
}

/* ============================ 按钮 ============================ */
.btn {
  font: inherit; font-size: 13.5px; cursor: pointer;
  padding: 8px 15px; border-radius: var(--radius-sm);
  border: 1px solid var(--border-2); background: var(--surface);
  color: var(--text); transition: .15s; white-space: nowrap;
}
.btn:hover { border-color: var(--accent); color: var(--accent); }
.btn-primary {
  background: var(--accent); border-color: var(--accent); color: #fff; font-weight: 500;
}
.btn-primary:hover { background: var(--accent-dark); border-color: var(--accent-dark); color: #fff; }
.btn-sm { padding: 6px 11px; font-size: 12.5px; }
.btn:disabled { opacity: .45; cursor: not-allowed; }
.btn-row { display: flex; gap: 8px; flex-wrap: wrap; }

.link-btn {
  background: none; border: none; padding: 0 0 0 6px;
  color: var(--accent); cursor: pointer; font: inherit; font-size: 12.5px;
}
.link-btn:hover { text-decoration: underline; }

/* ============================ 布局 ============================ */
.layout {
  max-width: 1680px; margin: 0 auto;
  display: grid; grid-template-columns: var(--panel-w) minmax(0, 1fr);
  gap: 20px; padding: 20px;
  align-items: start;
}

/* ============================ 控制面板 ============================ */
.panel {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  box-shadow: var(--shadow-sm);
  overflow: hidden;
  position: sticky; top: 80px;
  max-height: calc(100vh - 100px);
  overflow-y: auto;
  overscroll-behavior: contain;
}
.panel::-webkit-scrollbar { width: 8px; }
.panel::-webkit-scrollbar-thumb { background: #dcd8d0; border-radius: 4px; }

.group { border-bottom: 1px solid var(--border); }
.group:last-child { border-bottom: none; }
.group-title {
  margin: 0; padding: 13px 16px; cursor: pointer;
  font-size: 13.5px; font-weight: 600; letter-spacing: .2px;
  display: flex; align-items: center; justify-content: space-between;
  user-select: none; background: var(--surface-2);
}
.group-title:hover { background: #f2f0ec; }
.group-arrow {
  width: 7px; height: 7px; flex: none;
  border-right: 1.6px solid var(--text-muted);
  border-bottom: 1.6px solid var(--text-muted);
  transform: rotate(-45deg); transition: transform .2s; opacity: .7;
}
.group.open .group-arrow { transform: rotate(45deg); }
.group-body { padding: 14px 16px 18px; display: none; }
.group.open .group-body { display: block; }

.field { display: block; margin-bottom: 14px; }
.field:last-child { margin-bottom: 0; }
.field-label {
  display: flex; align-items: center; gap: 4px;
  font-size: 12.5px; color: var(--text-muted);
  margin-bottom: 6px;
}
.field-row { display: grid; grid-template-columns: 1fr 1fr; gap: 10px; }

input[type="text"], input[type="number"], select {
  width: 100%; font: inherit; font-size: 13.5px; padding: 8px 10px;
  border: 1px solid var(--border-2); border-radius: var(--radius-sm);
  background: var(--surface); color: var(--text);
  transition: border-color .15s, box-shadow .15s;
}
select { cursor: pointer; }
input:focus, select:focus {
  outline: none; border-color: var(--accent);
  box-shadow: 0 0 0 3px rgba(47,95,208,.12);
}
input:disabled { background: #f4f3f1; color: #a8a49c; cursor: not-allowed; }

input[type="color"] {
  width: 100%; height: 36px; padding: 3px; cursor: pointer;
  border: 1px solid var(--border-2); border-radius: var(--radius-sm); background: var(--surface);
}
input[type="file"] { font-size: 12.5px; }

.range-row { display: flex; align-items: center; gap: 10px; }
.range-row input[type="range"] { flex: 1; accent-color: var(--accent); cursor: pointer; }
.range-row .num { width: 66px; flex: none; text-align: center; }

.seg {
  display: flex; gap: 4px; padding: 3px;
  background: var(--surface-2); border: 1px solid var(--border);
  border-radius: var(--radius-sm);
}
.seg button {
  flex: 1; font: inherit; font-size: 12.5px; padding: 6px 8px; cursor: pointer;
  border: none; border-radius: 5px; background: transparent; color: var(--text-muted);
  transition: .15s; white-space: nowrap;
}
.seg button:hover:not(:disabled) { color: var(--text); }
.seg button.on { background: var(--surface); color: var(--accent); font-weight: 600; box-shadow: var(--shadow-sm); }
.seg button:disabled { opacity: .4; cursor: not-allowed; }

.switch { display: flex; align-items: center; gap: 9px; cursor: pointer; font-size: 13.5px; margin-bottom: 12px; }
.switch input { width: 16px; height: 16px; accent-color: var(--accent); cursor: pointer; }
.switch em {
  font-style: normal; font-size: 11px; padding: 1px 6px; border-radius: 20px;
  background: var(--accent-soft); color: var(--accent); font-weight: 600;
}
.margin-lock { margin-bottom: 12px; }
.mini-check { display: inline-flex; align-items: center; gap: 4px; font-size: 11.5px; color: var(--text-muted); margin-left: auto; }
.mini-check input { width: 13px; height: 13px; accent-color: var(--accent); cursor: pointer; }

.hint { margin: 8px 0 0; font-size: 12px; color: var(--text-muted); line-height: 1.55; }
.hint b { color: var(--accent); }

/* ============================ 预览区 ============================ */
.stage { min-width: 0; }
.stage-bar {
  display: flex; align-items: center; justify-content: space-between; gap: 12px;
  margin-bottom: 14px; flex-wrap: wrap;
}
.stage-info { font-size: 13px; color: var(--text-muted); }
.stage-ctrl { display: flex; align-items: center; gap: 14px; }
.page-nav { display: flex; align-items: center; gap: 6px; }
.page-nav button {
  width: 28px; height: 28px; cursor: pointer; font-size: 16px; line-height: 1;
  border: 1px solid var(--border-2); border-radius: var(--radius-sm);
  background: var(--surface); color: var(--text);
}
.page-nav button:hover { border-color: var(--accent); color: var(--accent); }
.page-nav span { font-size: 12.5px; min-width: 54px; text-align: center; color: var(--text-muted); }
.zoom-ctrl, .zoom-ctrl input { display: inline-flex; align-items: center; gap: 5px; font-size: 12.5px; color: var(--text-muted); cursor: pointer; }
.zoom-ctrl input { accent-color: var(--accent); cursor: pointer; }

.canvas-wrap {
  background:
    repeating-conic-gradient(#e9e6e0 0% 25%, #f2efe9 0% 50%) 50% / 18px 18px;
  border: 1px solid var(--border); border-radius: var(--radius);
  padding: 26px;
  display: flex; justify-content: center;
  box-shadow: inset 0 1px 3px rgba(40,35,25,.05);
  overflow: auto;
}
.paper-shadow { box-shadow: var(--shadow-paper); border-radius: 1px; line-height: 0; }
.paper-shadow svg { display: block; width: 100%; height: auto; }
.canvas-wrap.actual-size { justify-content: flex-start; }
.canvas-wrap.actual-size .paper-shadow svg { width: auto; height: auto; }

.tips { display: grid; grid-template-columns: repeat(3, 1fr); gap: 14px; margin-top: 18px; }
.tip { background: var(--surface); border: 1px solid var(--border); border-radius: var(--radius); padding: 14px 16px; }
.tip h4 { margin: 0 0 6px; font-size: 13.5px; color: var(--accent); }
.tip p { margin: 0; font-size: 12.5px; color: var(--text-muted); line-height: 1.6; }

/* ============================ 页脚 ============================ */
.footer {
  margin-top: 34px; background: var(--surface);
  border-top: 1px solid var(--border);
}
.footer-inner {
  max-width: 1680px; margin: 0 auto; padding: 30px 20px;
  display: flex; gap: 40px; flex-wrap: wrap; justify-content: space-between;
}
.footer-brand strong { font-size: 15px; }
.footer-brand p { margin: 6px 0 0; font-size: 12.5px; color: var(--text-muted); max-width: 340px; }
.footer-links { display: flex; gap: 46px; }
.footer-links div { display: flex; flex-direction: column; gap: 5px; }
.footer-links h5 { margin: 0 0 3px; font-size: 12.5px; color: var(--text); }
.footer-links a { font-size: 12.5px; color: var(--text-muted); }
.footer-links a:hover { color: var(--accent); }

/* ---------- 关于页联系卡片 ---------- */
.contact-cards {
  display: flex; gap: 20px; flex-wrap: wrap;
  margin: 18px 0 8px;
}
.contact-card {
  flex: 1 1 240px; max-width: 340px;
  border: 1px solid var(--border); border-radius: var(--radius);
  padding: 20px 22px; background: var(--surface-2);
}
.contact-card h4 { margin: 0 0 10px; font-size: 14.5px; }
.contact-card p { margin: 10px 0 0; font-size: 13px; color: var(--text-muted); line-height: 1.7; }
.contact-mail-big {
  font-size: 15px; font-weight: 550; color: var(--accent);
  word-break: break-all;
}
.contact-qr {
  display: block; width: 168px; height: 168px;
  border-radius: 6px; border: 1px solid var(--border);
}
.footer-bottom {
  border-top: 1px solid var(--border); padding: 14px 20px;
  text-align: center; font-size: 12px; color: var(--text-muted);
}
.footer-bottom b { color: var(--text); font-weight: 550; }

/* ---------- 页脚联系区（邮箱 + 悬停二维码） ---------- */
.footer-contact {
  display: flex; flex-direction: column; gap: 6px; min-width: 180px;
}
.footer-contact h5 { margin: 0 0 3px; font-size: 12.5px; color: var(--text); }
.contact-mail { font-size: 12.5px; color: var(--text-muted); }
.contact-mail:hover { color: var(--accent); }

/* 悬停弹出二维码：鼠标移上去显示，移开消失 */
.qr-hover { position: relative; display: inline-flex; align-self: flex-start; }
.qr-trigger {
  font-size: 12.5px; color: var(--text-muted); cursor: help;
  border-bottom: 1px dashed var(--border-2); padding-bottom: 1px;
  transition: .15s;
}
.qr-hover:hover .qr-trigger,
.qr-hover:focus-within .qr-trigger { color: var(--accent); border-bottom-color: var(--accent); }
.qr-pop {
  position: absolute; bottom: calc(100% + 12px); left: 50%;
  transform: translate(-50%, 6px);
  background: var(--surface); border: 1px solid var(--border);
  border-radius: var(--radius); padding: 9px 9px 6px;
  box-shadow: var(--shadow-md);
  opacity: 0; visibility: hidden; pointer-events: none;
  transition: opacity .18s ease, transform .18s ease, visibility .18s;
  z-index: 80; white-space: nowrap;
}
.qr-hover:hover .qr-pop,
.qr-hover:focus-within .qr-pop {
  opacity: 1; visibility: visible; transform: translate(-50%, 0);
}
.qr-pop img {
  display: block; width: 148px; height: 148px;
  border-radius: 4px; border: 1px solid var(--border);
}
.qr-pop > span:last-child {
  display: block; text-align: center; margin-top: 5px;
  font-size: 11px; color: var(--text-muted);
}
/* 小屏下弹出层可能超出右边缘：靠右时改为右对齐 */
@media (max-width: 640px) {
  .qr-pop { left: auto; right: -8px; transform: translate(0, 6px); }
  .qr-hover:hover .qr-pop,
  .qr-hover:focus-within .qr-pop { transform: translate(0, 0); }
}

/* ============================ 提示层 ============================ */
.toast {
  position: fixed; left: 50%; bottom: 32px; transform: translateX(-50%);
  background: #2b2a28; color: #fff; padding: 10px 20px; border-radius: 24px;
  font-size: 13.5px; box-shadow: var(--shadow-md); z-index: 200;
  animation: toastIn .22s ease;
}
.toast-ok { background: var(--ok); }
.toast-err { background: var(--danger); }
@keyframes toastIn { from { opacity: 0; transform: translate(-50%, 12px); } }

.busy {
  position: fixed; inset: 0; z-index: 300;
  background: rgba(255,255,255,.72); backdrop-filter: blur(3px);
  display: flex; flex-direction: column; align-items: center; justify-content: center; gap: 14px;
  font-size: 14px; color: var(--text);
}
.spinner {
  width: 34px; height: 34px; border-radius: 50%;
  border: 3px solid #dcd8d0; border-top-color: var(--accent);
  animation: spin .8s linear infinite;
}
@keyframes spin { to { transform: rotate(360deg); } }

/* ============================ 响应式 ============================ */
@media (max-width: 1080px) {
  .tips { grid-template-columns: 1fr; }
}
@media (max-width: 900px) {
  .layout { grid-template-columns: 1fr; padding: 14px; }
  .topnav { display: none; }
  .menu-toggle { display: block; }
  .topbar-actions { display: none; }
  .topbar-actions.show { display: flex; position: absolute; right: 60px; }
  .panel {
    position: fixed; inset: 60px 0 0 auto; width: min(340px, 88vw);
    z-index: 60; max-height: calc(100vh - 60px);
    transform: translateX(100%); transition: transform .24s ease;
    box-shadow: var(--shadow-md);
  }
  .panel.open { transform: translateX(0); }
  .canvas-wrap { padding: 14px; }
}

/* ============================ 内页（指南/关于/条款） ============================ */
.doc {
  max-width: 820px; margin: 0 auto; padding: 40px 24px 60px;
  background: var(--surface); border: 1px solid var(--border);
  border-radius: var(--radius); box-shadow: var(--shadow-sm);
  margin-top: 24px; margin-bottom: 40px;
}
.doc h1 { font-size: 26px; margin: 0 0 8px; }
.doc h2 { font-size: 19px; margin: 34px 0 12px; padding-top: 14px; border-top: 1px solid var(--border); }
.doc h3 { font-size: 15.5px; margin: 22px 0 8px; color: var(--accent); }
.doc p, .doc li { font-size: 14.5px; line-height: 1.8; color: #423f3a; }
.doc ul, .doc ol { padding-left: 22px; }
.doc .lead { color: var(--text-muted); font-size: 14.5px; margin: 0 0 4px; }
.doc code {
  background: var(--surface-2); border: 1px solid var(--border);
  border-radius: 5px; padding: 1px 6px; font-size: 13px;
}
.doc table { width: 100%; border-collapse: collapse; margin: 14px 0; font-size: 13.5px; }
.doc th, .doc td { border: 1px solid var(--border); padding: 8px 11px; text-align: left; }
.doc th { background: var(--surface-2); font-weight: 600; }