/* ============================================================
   全局样式：前台（iLovePDF 风格）+ 通用组件（按钮、表单、面板、开关等）
   后台专用样式见 admin.css
   ============================================================ */
:root {
  --bg: #f5f6f8;
  --bg-soft: #eef0f4;
  --card: #ffffff;
  --border: #e8eaef;
  --border-soft: #f0f1f4;
  --text: #1f2937;
  --text-soft: #6b7280;
  --muted: #9ca3af;
  --primary: #e5322d;
  --primary-dark: #c0282a;
  --primary-soft: #fdeceb;
  --primary-tint: #fff3f2;
  --success: #16a34a;
  --success-soft: #dcfce7;
  --danger: #dc2626;
  --danger-soft: #fee2e2;
  --warn: #d97706;
  --warn-soft: #fef3c7;
  --radius: 16px;
  --radius-sm: 10px;
  --radius-lg: 20px;
  --shadow: 0 1px 2px rgba(0, 0, 0, .04), 0 2px 10px rgba(0, 0, 0, .04);
  --shadow-hover: 0 10px 30px rgba(229, 50, 45, .14);
}

* { box-sizing: border-box; }

html, body {
  margin: 0;
  padding: 0;
  font-family: "Inter", -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto,
    "PingFang SC", "Microsoft YaHei", "Helvetica Neue", Arial, sans-serif;
  color: var(--text);
  background: var(--bg);
  line-height: 1.6;
  -webkit-font-smoothing: antialiased;
}

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

.container { max-width: 1180px; margin: 0 auto; padding: 0 24px; }

/* ---- 顶栏 ---- */
.topbar {
  background: rgba(255, 255, 255, .92);
  border-bottom: 1px solid var(--border-soft);
  position: sticky;
  top: 0;
  z-index: 50;
  backdrop-filter: saturate(180%) blur(10px);
}
.topbar-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 64px;
}
.brand {
  display: flex;
  align-items: center;
  gap: 10px;
  font-weight: 700;
  font-size: 18px;
  color: var(--text);
}
.brand-logo { width: 34px; height: 34px; display: block; }
.brand-text { letter-spacing: -.2px; }
.topnav { display: flex; align-items: center; gap: 4px; }
.topnav a {
  padding: 8px 14px;
  border-radius: var(--radius-sm);
  color: var(--text-soft);
  font-weight: 500;
  font-size: 14px;
  transition: all .15s;
}
.topnav a:hover { background: var(--bg-soft); color: var(--text); }

.lang-btn {
  background: none;
  border: 1px solid var(--border);
  padding: 7px 14px;
  border-radius: 20px;
  cursor: pointer;
  font-size: 13px;
  color: var(--text-soft);
  transition: all .15s;
  margin-left: 6px;
}
.lang-btn:hover { border-color: var(--primary); color: var(--primary); background: var(--primary-tint); }

/* ---- Hero ---- */
.hero {
  text-align: center;
  padding: 72px 0 36px;
}
.hero-title {
  font-size: 40px;
  font-weight: 800;
  margin: 0 0 14px;
  color: var(--text);
  letter-spacing: -1px;
  line-height: 1.15;
}
.hero-sub {
  font-size: 17px;
  color: var(--text-soft);
  margin: 0 auto;
  max-width: 560px;
}
.hero-badge {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  background: var(--primary-tint);
  color: var(--primary);
  font-size: 13px;
  font-weight: 600;
  padding: 5px 14px;
  border-radius: 20px;
  margin-bottom: 18px;
}
.hero-badge::before {
  content: "";
  width: 6px; height: 6px;
  border-radius: 50%;
  background: var(--primary);
}

/* ---- 分类 ---- */
.category { margin: 44px 0; }
.category-head {
  margin-bottom: 22px;
  display: flex;
  align-items: baseline;
  gap: 14px;
  flex-wrap: wrap;
}
.category-head h2 {
  font-size: 22px;
  font-weight: 700;
  margin: 0;
  color: var(--text);
}
.category-desc { color: var(--text-soft); margin: 0; font-size: 14px; }

/* ---- 工具卡片网格 ---- */
.tool-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(285px, 1fr));
  gap: 20px;
}
.tool-card {
  display: flex;
  flex-direction: column;
  gap: 14px;
  padding: 24px;
  background: var(--card);
  border: 1px solid var(--border-soft);
  border-radius: var(--radius);
  box-shadow: var(--shadow);
  color: var(--text);
  transition: transform .2s ease, box-shadow .2s ease, border-color .2s ease;
  position: relative;
  overflow: hidden;
}
.tool-card:hover:not(.disabled) {
  transform: translateY(-4px);
  box-shadow: var(--shadow-hover);
  border-color: var(--primary-soft);
}
.tool-card.disabled {
  opacity: .55;
  background: var(--bg-soft);
  cursor: not-allowed;
}
.tool-card.disabled .tool-icon { filter: grayscale(.7); opacity: .6; }
.tool-icon {
  width: 56px;
  height: 56px;
  display: flex;
  align-items: center;
  justify-content: center;
  border-radius: 14px;
  flex-shrink: 0;
}
.tool-icon svg { width: 28px; height: 28px; }
.tool-body { display: flex; flex-direction: column; gap: 4px; }
.tool-name {
  font-size: 16px;
  font-weight: 700;
  color: var(--text);
}
.tool-desc {
  font-size: 13px;
  color: var(--text-soft);
  flex: 1;
}
.muted { color: var(--muted) !important; }

/* ---- 页脚 ---- */
.footer {
  text-align: center;
  padding: 44px 0 32px;
  color: var(--muted);
  font-size: 13px;
  border-top: 1px solid var(--border-soft);
  margin-top: 72px;
}
.footer-links {
  display: flex;
  justify-content: center;
  gap: 18px;
  margin-bottom: 10px;
}
.footer-links a { color: var(--text-soft); font-size: 13px; }
.footer-links a:hover { color: var(--primary); }

/* ---- 工具页 ---- */
.tool-page { padding: 32px 0 64px; }
.tool-header { margin-bottom: 26px; }
.back-link {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  margin-bottom: 18px;
  color: var(--text-soft);
  font-size: 14px;
  font-weight: 500;
}
.back-link:hover { color: var(--primary); }
.tool-title-block { display: flex; align-items: center; gap: 18px; }
.tool-title-icon {
  width: 64px; height: 64px;
  display: flex; align-items: center; justify-content: center;
  border-radius: var(--radius);
  flex-shrink: 0;
}
.tool-title-icon svg { width: 32px; height: 32px; }
.tool-title { font-size: 28px; margin: 0; font-weight: 800; letter-spacing: -.5px; }
.tool-subtitle { color: var(--text-soft); margin: 4px 0 0; font-size: 15px; }

.tool-layout {
  display: grid;
  grid-template-columns: 1.4fr 1fr;
  gap: 22px;
  margin-bottom: 26px;
}
@media (max-width: 860px) {
  .tool-layout { grid-template-columns: 1fr; }
}
.panel {
  background: var(--card);
  border: 1px solid var(--border-soft);
  border-radius: var(--radius);
  padding: 24px;
  box-shadow: var(--shadow);
}
.panel-title {
  font-size: 15px;
  font-weight: 700;
  margin: 0 0 18px;
  color: var(--text);
}

/* 上传区 */
.file-input-hidden { display: none; }
.dropzone {
  border: 2px dashed var(--border);
  border-radius: var(--radius);
  padding: 48px 24px;
  text-align: center;
  cursor: pointer;
  transition: all .2s;
  background: var(--bg-soft);
}
.dropzone:hover, .dropzone.dragover {
  border-color: var(--primary);
  background: var(--primary-tint);
}
.dropzone-icon {
  width: 56px; height: 56px;
  margin: 0 auto 12px;
  display: flex; align-items: center; justify-content: center;
  background: var(--card);
  border-radius: 50%;
  box-shadow: var(--shadow);
}
.dropzone-icon svg { width: 26px; height: 26px; stroke: var(--primary); }
.dropzone-text { color: var(--text-soft); margin-bottom: 16px; font-size: 14px; }
.file-list { margin-top: 16px; display: flex; flex-direction: column; gap: 8px; }
.file-chip {
  display: flex;
  align-items: center;
  gap: 10px;
  padding: 10px 14px;
  background: var(--bg-soft);
  border: 1px solid var(--border-soft);
  border-radius: var(--radius-sm);
  font-size: 13px;
}
.file-chip-name { flex: 1; overflow: hidden; text-overflow: ellipsis; white-space: nowrap; font-weight: 500; }
.file-chip-size { color: var(--muted); }
.file-chip-x {
  background: none; border: none; cursor: pointer;
  color: var(--muted); font-size: 18px; line-height: 1;
  padding: 2px 6px; border-radius: 6px;
}
.file-chip-x:hover { color: var(--danger); background: var(--danger-soft); }

/* 参数表单 */
.param-grid { display: flex; flex-direction: column; gap: 18px; }
.param-row { display: flex; flex-direction: column; gap: 7px; }
.param-label { font-size: 13px; font-weight: 600; color: var(--text-soft); }
.param-control input, .param-control select { width: 100%; }

/* 通用表单元素 */
input[type="text"], input[type="number"], input[type="password"], select, textarea {
  width: 100%;
  padding: 10px 13px;
  border: 1px solid var(--border);
  border-radius: var(--radius-sm);
  font-size: 14px;
  font-family: inherit;
  background: var(--card);
  color: var(--text);
  transition: border-color .15s, box-shadow .15s;
}
input:focus, select:focus, textarea:focus {
  outline: none;
  border-color: var(--primary);
  box-shadow: 0 0 0 3px var(--primary-soft);
}

/* 按钮 */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 7px;
  padding: 10px 20px;
  border-radius: var(--radius-sm);
  border: 1px solid transparent;
  font-size: 14px;
  font-weight: 600;
  cursor: pointer;
  transition: all .15s;
  font-family: inherit;
  text-decoration: none;
}
.btn-primary { background: var(--primary); color: #fff; }
.btn-primary:hover { background: var(--primary-dark); color: #fff; }
.btn-outline { background: var(--card); border-color: var(--border); color: var(--text); }
.btn-outline:hover { border-color: var(--primary); color: var(--primary); }
.btn-lg { padding: 13px 30px; font-size: 15px; }
.btn-sm { padding: 6px 12px; font-size: 13px; }
.btn-block { width: 100%; }
.btn:disabled { opacity: .6; cursor: not-allowed; }

/* 开关 */
.switch {
  position: relative;
  display: inline-block;
  width: 44px;
  height: 24px;
}
.switch input { opacity: 0; width: 0; height: 0; }
.slider {
  position: absolute;
  inset: 0;
  background: #cbd5e1;
  border-radius: 24px;
  transition: .2s;
  cursor: pointer;
}
.slider::before {
  content: "";
  position: absolute;
  height: 18px; width: 18px;
  left: 3px; bottom: 3px;
  background: #fff;
  border-radius: 50%;
  transition: .2s;
  box-shadow: 0 1px 3px rgba(0,0,0,.2);
}
.switch input:checked + .slider { background: var(--primary); }
.switch input:checked + .slider::before { transform: translateX(20px); }

/* 操作按钮区 */
.actions { text-align: center; margin: 26px 0; }
.progress-wrap { margin: 18px auto 0; max-width: 440px; }
.progress-bar { height: 10px; background: var(--bg-soft); border: 1px solid var(--border-soft); border-radius: 6px; overflow: hidden; }
.progress-fill { height: 100%; width: 0%; background: var(--primary); border-radius: 6px; transition: width .3s ease; }
.progress-text { margin-top: 8px; font-size: 13px; color: var(--text-soft); }

/* 结果框 */
.result-box { transition: all .2s; }
.result-box.hidden { display: none; }
.result-box.ok { border-color: var(--success-soft); background: linear-gradient(135deg, var(--success-soft), #fff); }
.result-box.err { border-color: var(--danger-soft); background: linear-gradient(135deg, var(--danger-soft), #fff); }
.result-head { font-size: 18px; font-weight: 700; margin-bottom: 10px; }
.result-file { font-weight: 600; word-break: break-all; margin-bottom: 8px; }
.result-meta { display: flex; gap: 20px; color: var(--text-soft); font-size: 13px; margin-bottom: 16px; }
.result-box .btn { margin-top: 4px; }

/* flash 提示 */
.flash {
  padding: 11px 15px;
  border-radius: var(--radius-sm);
  font-size: 14px;
  margin-bottom: 14px;
}
.flash.success { background: var(--success-soft); color: #166534; }
.flash.error { background: var(--danger-soft); color: #991b1b; }
.flash.warn { background: var(--warn-soft); color: #92400e; }
.badge-warn {
  display: inline-block;
  background: var(--warn-soft);
  color: #92400e;
  padding: 2px 8px;
  border-radius: 12px;
  font-size: 12px;
  margin-left: 8px;
}