/* ==========================================================
   批量开票模板生成工具 - 全局样式（PC / 平板 / 移动端适配）
   ========================================================== */

:root {
  --c-primary: #1d5fd6;
  --c-primary-dark: #14479c;
  --c-primary-light: #eaf1fd;
  --c-accent: #ff7a18;
  --c-text: #1f2937;
  --c-text-sub: #5b6472;
  --c-border: #dde3ec;
  --c-bg: #f5f7fb;
  --c-card: #ffffff;
  --c-ok: #16a34a;
  --c-err: #dc2626;
  --radius: 12px;
  --shadow: 0 4px 16px rgba(20, 40, 80, 0.08);
  --header-h: 60px;
}

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

html { scroll-behavior: smooth; scroll-padding-top: calc(var(--header-h) + 12px); }

body {
  font-family: "PingFang SC", "Microsoft YaHei", "Hiragino Sans GB", "Segoe UI", Arial, sans-serif;
  color: var(--c-text);
  background: var(--c-bg);
  line-height: 1.7;
  -webkit-font-smoothing: antialiased;
}

img { max-width: 100%; }

.container { width: 100%; max-width: 1120px; margin: 0 auto; padding: 0 20px; }
.container-narrow { max-width: 860px; }

/* ---------- 按钮 ---------- */
.btn {
  display: inline-flex; align-items: center; justify-content: center;
  gap: 6px; border: 1px solid transparent; border-radius: 8px;
  padding: 9px 20px; font-size: 14px; cursor: pointer;
  text-decoration: none; white-space: nowrap;
  transition: background .18s, color .18s, border-color .18s, transform .1s;
}
.btn:active { transform: translateY(1px); }
.btn-primary { background: var(--c-primary); color: #fff; }
.btn-primary:hover { background: var(--c-primary-dark); }
.btn-outline { background: transparent; color: var(--c-primary); border-color: var(--c-primary); }
.btn-outline:hover { background: var(--c-primary-light); }
.btn-ghost { background: rgba(255, 255, 255, .14); color: #fff; border-color: rgba(255, 255, 255, .5); }
.btn-ghost:hover { background: rgba(255, 255, 255, .26); }
.btn-text { background: transparent; color: var(--c-primary); padding: 9px 10px; }
.btn-text:hover { text-decoration: underline; }
.btn-lg { padding: 13px 34px; font-size: 16px; border-radius: 10px; }
.link-btn { background: none; border: none; color: var(--c-primary); cursor: pointer; font-size: 14px; text-decoration: underline; padding: 0; }

/* ---------- 顶部导航 ---------- */
.site-header {
  position: sticky; top: 0; z-index: 50;
  height: var(--header-h);
  background: rgba(255, 255, 255, .92);
  backdrop-filter: blur(8px);
  border-bottom: 1px solid var(--c-border);
}
.header-inner { display: flex; align-items: center; justify-content: space-between; height: var(--header-h); }
.logo { display: flex; align-items: center; gap: 10px; text-decoration: none; color: var(--c-text); }
.logo-icon {
  width: 34px; height: 34px; border-radius: 8px;
  background: linear-gradient(135deg, var(--c-primary), #4f8ef7);
  color: #fff; font-weight: 700; font-size: 17px;
  display: inline-flex; align-items: center; justify-content: center;
}
.logo-text { font-size: 17px; font-weight: 700; }
.site-nav { display: flex; gap: 26px; }
.site-nav a { color: var(--c-text-sub); text-decoration: none; font-size: 15px; }
.site-nav a:hover { color: var(--c-primary); }

/* ---------- 首屏 Hero ---------- */
.hero {
  background: linear-gradient(135deg, #143a7c 0%, var(--c-primary) 55%, #3e7be8 100%);
  color: #fff; padding: 72px 0 60px;
}
.hero h1 { font-size: 38px; line-height: 1.3; margin-bottom: 18px; }
.hero-sub { font-size: 17px; max-width: 720px; color: rgba(255, 255, 255, .9); margin-bottom: 30px; }
.hero-sub strong { color: #ffd479; }
.hero-actions { display: flex; gap: 14px; flex-wrap: wrap; margin-bottom: 30px; }
.hero-points { display: flex; flex-wrap: wrap; gap: 10px 26px; list-style: none; }
.hero-points li { position: relative; padding-left: 22px; font-size: 14px; color: rgba(255, 255, 255, .88); }
.hero-points li::before { content: "✓"; position: absolute; left: 0; color: #7ef0a4; font-weight: 700; }

/* ---------- 通用区块 ---------- */
.section-title { font-size: 28px; text-align: center; margin-bottom: 10px; }
.section-desc { text-align: center; color: var(--c-text-sub); margin-bottom: 34px; }

/* ---------- 工具区 ---------- */
.tool-section { padding: 56px 0 40px; }

.steps {
  display: flex; list-style: none; gap: 8px;
  margin: 0 0 26px; overflow-x: auto; padding-bottom: 4px;
}
.step {
  flex: 1; min-width: 150px; display: flex; align-items: center; gap: 8px;
  background: var(--c-card); border: 1px solid var(--c-border);
  border-radius: 10px; padding: 10px 14px;
  font-size: 14px; color: var(--c-text-sub);
}
.step-num {
  width: 24px; height: 24px; flex: none; border-radius: 50%;
  background: var(--c-border); color: #fff; font-size: 13px;
  display: inline-flex; align-items: center; justify-content: center;
}
.step.is-active { border-color: var(--c-primary); color: var(--c-primary); font-weight: 600; background: var(--c-primary-light); }
.step.is-active .step-num { background: var(--c-primary); }
.step.is-done .step-num { background: var(--c-ok); }

.panel {
  background: var(--c-card); border: 1px solid var(--c-border);
  border-radius: var(--radius); box-shadow: var(--shadow);
  padding: 28px; margin-bottom: 22px;
}
.panel-title { font-size: 19px; margin-bottom: 8px; }
.panel-subtitle { font-size: 16px; margin: 24px 0 12px; }
.panel-desc { color: var(--c-text-sub); font-size: 14px; margin-bottom: 18px; }
.panel-tip { margin-top: 16px; font-size: 14px; color: var(--c-text-sub); }
.panel-actions { display: flex; gap: 12px; flex-wrap: wrap; margin-top: 24px; }

/* 上传区 */
.dropzone {
  border: 2px dashed var(--c-border); border-radius: var(--radius);
  background: #fafcff; padding: 46px 20px; text-align: center;
  cursor: pointer; transition: border-color .18s, background .18s;
}
.dropzone:hover, .dropzone.dragover, .dropzone:focus-visible {
  border-color: var(--c-primary); background: var(--c-primary-light); outline: none;
}
.dropzone-icon { font-size: 40px; color: var(--c-primary); margin-bottom: 8px; }
.dropzone-text { font-size: 16px; }
.dropzone-text em { color: var(--c-primary); font-style: normal; font-weight: 600; }
.dropzone-hint { font-size: 13px; color: var(--c-text-sub); margin-top: 6px; }

.upload-meta { display: flex; align-items: center; gap: 14px; flex-wrap: wrap; margin-top: 16px; font-size: 14px; }
.file-badge { background: var(--c-primary-light); color: var(--c-primary); border-radius: 6px; padding: 4px 12px; font-weight: 600; word-break: break-all; }
.file-stat { color: var(--c-text-sub); }

/* 字段映射 */
.mapping-grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: 14px; }
.field { display: flex; flex-direction: column; gap: 6px; }
.field-label { font-size: 13px; color: var(--c-text-sub); }
.field-label .req { color: var(--c-err); margin-left: 2px; }
.field select, .field input[type="text"] {
  height: 40px; border: 1px solid var(--c-border); border-radius: 8px;
  padding: 0 12px; font-size: 14px; background: #fff; color: var(--c-text);
  width: 100%;
}
.field select:focus, .field input[type="text"]:focus { border-color: var(--c-primary); outline: none; }

.settings-grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: 14px; }
.checkbox-field { flex-direction: row; align-items: center; gap: 8px; font-size: 14px; }
.checkbox-field input { width: 16px; height: 16px; accent-color: var(--c-primary); }

/* 统计条 */
.stats-bar { display: flex; gap: 14px; flex-wrap: wrap; margin-bottom: 18px; }
.stat {
  flex: 1; min-width: 130px; background: #fafcff;
  border: 1px solid var(--c-border); border-radius: 10px;
  padding: 14px 18px; display: flex; flex-direction: column;
}
.stat-num { font-size: 24px; font-weight: 700; }
.stat-label { font-size: 13px; color: var(--c-text-sub); }
.stat-ok .stat-num { color: var(--c-ok); }
.stat-err .stat-num { color: var(--c-err); }

.toolbar { display: flex; align-items: center; justify-content: space-between; gap: 12px; flex-wrap: wrap; margin-bottom: 12px; font-size: 14px; }
.inline-check { display: flex; align-items: center; gap: 8px; color: var(--c-text-sub); }
.inline-check input { width: 16px; height: 16px; accent-color: var(--c-primary); }
.pager { display: flex; align-items: center; gap: 6px; color: var(--c-text-sub); }

/* 数据表格 */
.table-wrap { overflow-x: auto; border: 1px solid var(--c-border); border-radius: 10px; -webkit-overflow-scrolling: touch; }
.data-table { width: 100%; border-collapse: collapse; font-size: 13px; min-width: 900px; }
.data-table th, .data-table td { padding: 9px 12px; border-bottom: 1px solid var(--c-border); text-align: left; white-space: nowrap; }
.data-table thead th { background: #f2f5fa; color: var(--c-text-sub); font-weight: 600; position: sticky; top: 0; }
.data-table tbody tr:hover { background: #fafcff; }
.data-table tr.row-error { background: #fef2f2; }
.data-table td.cell-err { color: var(--c-err); white-space: normal; min-width: 140px; }
.data-table td.num { text-align: right; font-variant-numeric: tabular-nums; }

/* 全局提示 */
.message {
  margin-top: 18px; padding: 12px 16px; border-radius: 8px; font-size: 14px;
  border: 1px solid;
}
.message.msg-ok { background: #f0fdf4; border-color: #bbf7d0; color: var(--c-ok); }
.message.msg-err { background: #fef2f2; border-color: #fecaca; color: var(--c-err); }
.message.msg-info { background: var(--c-primary-light); border-color: #bcd3f7; color: var(--c-primary-dark); }

/* ---------- 功能特点 ---------- */
.features-section { padding: 60px 0; background: #fff; }
.feature-grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: 20px; }
.feature-card {
  background: var(--c-bg); border: 1px solid var(--c-border);
  border-radius: var(--radius); padding: 24px;
  transition: box-shadow .18s, transform .18s;
}
.feature-card:hover { box-shadow: var(--shadow); transform: translateY(-3px); }
.feature-card h3 { font-size: 17px; margin-bottom: 8px; color: var(--c-primary-dark); }
.feature-card p { font-size: 14px; color: var(--c-text-sub); }

/* ---------- 使用指南 ---------- */
.guide-section { padding: 60px 0; }
.guide-list { list-style: none; display: grid; grid-template-columns: repeat(2, 1fr); gap: 20px; counter-reset: guide; }
.guide-list > li {
  background: var(--c-card); border: 1px solid var(--c-border);
  border-radius: var(--radius); padding: 24px;
}
.guide-list h3 { font-size: 16px; margin-bottom: 8px; color: var(--c-primary-dark); }
.guide-list p { font-size: 14px; color: var(--c-text-sub); }

/* ---------- FAQ ---------- */
.faq-section { padding: 60px 0; background: #fff; }
.faq-list { display: flex; flex-direction: column; gap: 12px; }
.faq-item {
  border: 1px solid var(--c-border); border-radius: 10px;
  background: var(--c-bg); padding: 0 20px;
}
.faq-item summary {
  cursor: pointer; padding: 15px 0; font-weight: 600; font-size: 15px;
  list-style: none; position: relative; padding-right: 30px;
}
.faq-item summary::-webkit-details-marker { display: none; }
.faq-item summary::after {
  content: "+"; position: absolute; right: 4px; top: 50%;
  transform: translateY(-50%); color: var(--c-primary); font-size: 20px;
}
.faq-item[open] summary::after { content: "−"; }
.faq-item p { padding: 0 0 16px; font-size: 14px; color: var(--c-text-sub); }

/* ---------- 页脚 ---------- */
.site-footer { background: #14233f; color: #aeb9cc; padding: 36px 0; text-align: center; }
.footer-brand { color: #fff; font-size: 16px; font-weight: 600; margin-bottom: 8px; }
.footer-desc { font-size: 13px; max-width: 720px; margin: 0 auto 10px; }
.footer-copy { font-size: 12px; color: #7c8aa0; }

/* ==========================================================
   响应式适配
   ========================================================== */

/* 平板 / 窄屏桌面 */
@media (max-width: 992px) {
  .hero h1 { font-size: 32px; }
  .mapping-grid, .settings-grid { grid-template-columns: repeat(2, 1fr); }
  .feature-grid { grid-template-columns: repeat(2, 1fr); }
  .guide-list { grid-template-columns: 1fr; }
}

/* 移动端 */
@media (max-width: 640px) {
  :root { --header-h: 54px; }
  .container { padding: 0 14px; }

  /* 导航：logo 与链接纵向压缩，链接缩小横向滚动 */
  .site-nav { gap: 14px; overflow-x: auto; }
  .site-nav a { font-size: 13px; flex: none; }
  .logo-text { font-size: 15px; }

  .hero { padding: 46px 0 40px; }
  .hero h1 { font-size: 25px; }
  .hero-sub { font-size: 14.5px; }
  .hero-actions .btn-lg { width: 100%; padding: 12px 20px; font-size: 15px; }
  .hero-points { flex-direction: column; gap: 8px; }

  .section-title { font-size: 22px; }
  .section-desc { font-size: 14px; margin-bottom: 24px; }

  .tool-section { padding: 36px 0 30px; }
  .steps { gap: 8px; }
  .step { min-width: 190px; flex: none; padding: 9px 12px; font-size: 13px; }

  .panel { padding: 18px 14px; border-radius: 10px; }
  .panel-title { font-size: 17px; }
  .dropzone { padding: 34px 14px; }
  .dropzone-text { font-size: 14.5px; }

  .mapping-grid, .settings-grid { grid-template-columns: 1fr; gap: 12px; }

  .stats-bar { gap: 10px; }
  .stat { min-width: calc(50% - 5px); padding: 12px 14px; }
  .stat-num { font-size: 20px; }

  .toolbar { flex-direction: column; align-items: flex-start; }

  .panel-actions { flex-direction: column; }
  .panel-actions .btn { width: 100%; }

  .features-section, .guide-section, .faq-section { padding: 42px 0; }
  .feature-grid { grid-template-columns: 1fr; }
  .guide-list > li, .feature-card { padding: 18px 16px; }

  .footer-desc { font-size: 12px; }
}

/* 超小屏 */
@media (max-width: 380px) {
  .hero h1 { font-size: 22px; }
  .stat { min-width: 100%; }
}