:root {
  color-scheme: light;
  --bg: #f6f8ff;
  --panel: rgba(255, 255, 255, 0.86);
  --text: #111827;
  --muted: #667085;
  --border: rgba(148, 163, 184, 0.28);
  --primary: #4f46e5;
  --primary-2: #06b6d4;
  --primary-dark: #3730a3;
  --success: #10b981;
  --warning: #f59e0b;
  --shadow: 0 30px 80px rgba(15, 23, 42, 0.14);
  --soft-shadow: 0 18px 46px rgba(15, 23, 42, 0.09);
}

/* 全局 hidden 属性优先级最高，覆盖 grid/flex 等 display 声明 */
[hidden] {
  display: none !important;
}

* {
  box-sizing: border-box;
}

html {
  scroll-behavior: smooth;
}

body {
  min-height: 100vh;
  margin: 0;
  background:
    radial-gradient(circle at 10% 5%, rgba(79, 70, 229, 0.18), transparent 28rem),
    radial-gradient(circle at 88% 12%, rgba(6, 182, 212, 0.22), transparent 26rem),
    linear-gradient(180deg, #fbfcff 0%, var(--bg) 48%, #eef4ff 100%);
  color: var(--text);
  font-family: Inter, ui-sans-serif, system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
}

body::before {
  position: fixed;
  inset: 0;
  z-index: -1;
  pointer-events: none;
  content: "";
  background-image:
    linear-gradient(rgba(79, 70, 229, 0.045) 1px, transparent 1px),
    linear-gradient(90deg, rgba(79, 70, 229, 0.045) 1px, transparent 1px);
  background-size: 42px 42px;
  mask-image: linear-gradient(to bottom, black, transparent 76%);
}

body.landing-bg {
  background:
    radial-gradient(circle at 16% 10%, rgba(16, 185, 129, 0.2), transparent 28rem),
    radial-gradient(circle at 84% 14%, rgba(79, 70, 229, 0.22), transparent 28rem),
    linear-gradient(180deg, #ffffff 0%, #f3f7ff 48%, #edfdf8 100%);
}

body.jpg-bg {
  background:
    radial-gradient(circle at 12% 8%, rgba(245, 158, 11, 0.22), transparent 26rem),
    radial-gradient(circle at 88% 12%, rgba(239, 68, 68, 0.16), transparent 24rem),
    linear-gradient(180deg, #fffaf0 0%, #f8fafc 54%, #eef2ff 100%);
}

body.png-bg {
  background:
    radial-gradient(circle at 12% 8%, rgba(6, 182, 212, 0.22), transparent 26rem),
    radial-gradient(circle at 88% 12%, rgba(20, 184, 166, 0.18), transparent 24rem),
    linear-gradient(180deg, #f0fdff 0%, #f8fafc 54%, #eef2ff 100%);
}

body.info-bg {
  background:
    radial-gradient(circle at 16% 8%, rgba(79, 70, 229, 0.2), transparent 28rem),
    radial-gradient(circle at 80% 12%, rgba(148, 163, 184, 0.22), transparent 26rem),
    linear-gradient(180deg, #ffffff 0%, #f8fafc 58%, #eef2ff 100%);
}

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

.site-header {
  position: sticky;
  top: 0;
  z-index: 10;
  background: rgba(255, 255, 255, 0.76);
  border-bottom: 1px solid rgba(226, 232, 240, 0.8);
  backdrop-filter: blur(18px);
}

.nav {
  display: flex;
  align-items: center;
  justify-content: space-between;
  max-width: 1180px;
  margin: 0 auto;
  padding: 16px 22px;
}

.brand {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  font-size: 1.35rem;
  font-weight: 900;
  letter-spacing: -0.045em;
}

.brand::before {
  display: inline-grid;
  width: 34px;
  height: 34px;
  place-items: center;
  border-radius: 12px;
  background: linear-gradient(135deg, var(--primary), var(--primary-2));
  color: #fff;
  content: "P";
  box-shadow: 0 14px 28px rgba(79, 70, 229, 0.28);
}

.nav-links {
  display: flex;
  align-items: center;
  gap: 4px;
}

/* 下拉菜单 */
.nav-dropdown {
  position: relative;
  padding-bottom: 8px;
  margin-bottom: -8px;
}

.nav-drop-btn {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  padding: 9px 14px;
  border: none;
  border-radius: 999px;
  background: transparent;
  color: #475467;
  font-family: inherit;
  font-size: 0.94rem;
  font-weight: 700;
  cursor: pointer;
  transition: color 0.2s, background 0.2s;
}

.nav-drop-btn:hover {
  background: #eef2ff;
  color: var(--primary);
}

.nav-drop-menu {
  display: none;
  position: absolute;
  top: calc(100% + 2px);
  left: 50%;
  transform: translateX(-50%);
  min-width: 210px;
  padding: 8px;
  border: 1px solid var(--border);
  border-radius: 18px;
  background: rgba(255, 255, 255, 0.95);
  box-shadow: var(--shadow);
  backdrop-filter: blur(18px);
  z-index: 20;
  flex-direction: column;
  gap: 2px;
  opacity: 0;
  transition: opacity 0.15s ease, visibility 0.15s;
  visibility: hidden;
}

/* hover 展开：鼠标移入整个 dropdown 区域就展开 */
.nav-dropdown:hover > .nav-drop-menu,
.nav-drop-btn:focus-visible ~ .nav-drop-menu,
.nav-drop-menu:hover {
  display: flex;
  opacity: 1;
  visibility: visible;
}

.nav-drop-menu a {
  display: block;
  padding: 10px 14px;
  border-radius: 12px;
  color: #475467;
  font-size: 0.9rem;
  font-weight: 700;
  white-space: nowrap;
  transition: color 0.15s, background 0.15s;
}

.nav-drop-menu a:hover {
  background: #eef2ff;
  color: var(--primary);
}

/* 普通导航链接 */
.nav-link-plain {
  padding: 9px 14px;
  border-radius: 999px;
  color: #475467;
  font-size: 0.94rem;
  font-weight: 700;
  transition: color 0.2s, background 0.2s;
}

.nav-link-plain:hover {
  background: #eef2ff;
  color: var(--primary);
}

.hero {
  max-width: 1040px;
  margin: 0 auto;
  padding: 78px 22px 28px;
  text-align: center;
}

.page-hero {
  padding-bottom: 18px;
}

.eyebrow {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  margin: 0 0 16px;
  padding: 8px 13px;
  border: 1px solid rgba(79, 70, 229, 0.18);
  border-radius: 999px;
  background: rgba(238, 242, 255, 0.8);
  color: var(--primary);
  font-weight: 850;
  text-transform: uppercase;
  letter-spacing: 0.11em;
  font-size: 0.76rem;
}

.eyebrow::before {
  width: 8px;
  height: 8px;
  border-radius: 99px;
  background: var(--success);
  content: "";
  box-shadow: 0 0 0 5px rgba(16, 185, 129, 0.14);
}

h1 {
  max-width: 920px;
  margin: 0 auto;
  font-size: clamp(2.6rem, 6.5vw, 5.7rem);
  line-height: 0.92;
  letter-spacing: -0.085em;
}

.hero-copy {
  max-width: 760px;
  margin: 24px auto 0;
  color: var(--muted);
  font-size: 1.17rem;
  line-height: 1.75;
}

/* USP 差异化优势条 */
.usp-bar {
  display: flex;
  justify-content: center;
  gap: 16px;
  margin-top: 32px;
  flex-wrap: wrap;
}

.usp-item {
  display: flex;
  align-items: center;
  gap: 10px;
  padding: 12px 18px;
  border: 1px solid rgba(79, 70, 229, 0.14);
  border-radius: 16px;
  background: rgba(255, 255, 255, 0.7);
  box-shadow: 0 4px 14px rgba(15, 23, 42, 0.05);
}

.usp-icon {
  display: grid;
  place-items: center;
  width: 30px;
  height: 30px;
  border-radius: 10px;
  font-size: 0.95rem;
  background: linear-gradient(135deg, #ecfdf5, #d1fae5);
  color: #059669;
  flex-shrink: 0;
}

.usp-item:nth-child(2) .usp-icon {
  background: linear-gradient(135deg, #eff6ff, #dbeafe);
  color: #2563eb;
}

.usp-item:nth-child(3) .usp-icon {
  background: linear-gradient(135deg, #fef3c7, #fde68a);
  color: #d97706;
}

.usp-item strong {
  display: block;
  font-size: 0.88rem;
  color: var(--text);
  letter-spacing: -0.02em;
}

.usp-item span {
  display: block;
  font-size: 0.78rem;
  color: var(--muted);
  text-align: left;
  line-height: 1.4;
}

/* 竞品对比表 */
.comparison-table {
  margin-top: 36px;
  overflow-x: auto;
  -webkit-overflow-scrolling: touch;
}

.comparison-table table {
  width: 100%;
  max-width: 640px;
  margin: 0 auto;
  border-collapse: collapse;
  border-radius: 18px;
  overflow: hidden;
  border: 1px solid rgba(148, 163, 184, 0.2);
  background: rgba(255, 255, 255, 0.8);
}

.comparison-table th,
.comparison-table td {
  padding: 10px 14px;
  text-align: center;
  font-size: 0.85rem;
  font-weight: 600;
  border-bottom: 1px solid rgba(148, 163, 184, 0.12);
}

.comparison-table th {
  background: rgba(79, 70, 229, 0.06);
  color: var(--text);
  font-weight: 800;
  font-size: 0.88rem;
}

.comparison-table td:first-child {
  text-align: left;
  font-weight: 700;
  color: var(--text);
}

.comparison-table th:first-child,
.comparison-table tr:last-child td {
  border-bottom: none;
}

.comparison-table th:nth-child(2) {
  color: var(--primary);
  background: rgba(79, 70, 229, 0.1);
}

.check {
  color: #059669;
  font-weight: 800;
}

.cross {
  color: #dc2626;
  font-weight: 700;
  opacity: 0.8;
}

.partial {
  color: #d97706;
  font-weight: 700;
}

/* 使用场景入口卡片 */
.use-case-grid {
  display: grid;
  grid-template-columns: repeat(4, minmax(0, 1fr));
  gap: 14px;
  margin-top: 32px;
}

/* 锁定目标大小的只读显示（专用页/场景页使用） */
.target-locked {
  display: flex;
  align-items: center;
  gap: 10px;
  min-height: 54px;
  padding: 0 18px;
  border: 2px solid rgba(79, 70, 229, 0.25);
  border-radius: 18px;
  background: linear-gradient(135deg, rgba(238, 242, 255, 0.9), rgba(236, 253, 245, 0.7));
}

.target-locked .target-badge {
  display: inline-flex;
  align-items: center;
  padding: 6px 14px;
  border-radius: 999px;
  background: linear-gradient(135deg, var(--primary), #2563eb);
  color: #fff;
  font-size: 1.05rem;
  font-weight: 900;
  letter-spacing: -0.03em;
}

.target-locked .target-hint {
  color: var(--muted);
  font-size: 0.82rem;
  font-weight: 600;
}

.use-case-card {
  display: flex;
  flex-direction: column;
  gap: 8px;
  padding: 20px 18px;
  border: 1px solid rgba(255, 255, 255, 0.8);
  border-radius: 22px;
  background: var(--panel);
  box-shadow: var(--soft-shadow);
  backdrop-filter: blur(18px);
  text-align: left;
  transition: transform 0.2s, border-color 0.2s, box-shadow 0.2s;
}

.use-case-card:hover {
  border-color: rgba(79, 70, 229, 0.38);
  transform: translateY(-3px);
  box-shadow: 0 22px 54px rgba(79, 70, 229, 0.12);
}

.use-case-icon {
  font-size: 1.6rem;
}

.use-case-card h3 {
  margin: 0;
  font-size: 0.95rem;
  letter-spacing: -0.03em;
  color: var(--text);
}

.use-case-card p {
  margin: 0;
  font-size: 0.8rem;
  color: var(--muted);
  line-height: 1.6;
}

.quick-links {
  display: flex;
  flex-wrap: wrap;
  justify-content: center;
  gap: 12px;
  margin-top: 30px;
}

.quick-links a {
  padding: 12px 16px;
  border: 1px solid rgba(79, 70, 229, 0.14);
  border-radius: 999px;
  background: rgba(255, 255, 255, 0.78);
  color: #344054;
  font-weight: 800;
  box-shadow: 0 10px 30px rgba(15, 23, 42, 0.06);
  transition: transform 0.2s, border-color 0.2s, box-shadow 0.2s;
}

.quick-links a:hover {
  border-color: rgba(79, 70, 229, 0.36);
  transform: translateY(-2px);
  box-shadow: 0 18px 42px rgba(79, 70, 229, 0.12);
}

.tool-shell,
.content-section {
  max-width: 1180px;
  margin: 0 auto;
  padding: 28px 22px;
}

.tool-card,
.info-card,
.preview-card,
.faq-card {
  border: 1px solid rgba(255, 255, 255, 0.8);
  background: var(--panel);
  box-shadow: var(--shadow);
  backdrop-filter: blur(18px);
}

.tool-card {
  position: relative;
  overflow: hidden;
  padding: 30px;
  border-radius: 34px;
}

.tool-card::before {
  position: absolute;
  inset: 0 0 auto;
  height: 5px;
  background: linear-gradient(90deg, var(--primary), var(--primary-2), var(--success));
  content: "";
}

.drop-zone {
  position: relative;
  display: grid;
  min-height: 250px;
  place-items: center;
  border: 2px dashed rgba(79, 70, 229, 0.32);
  border-radius: 28px;
  background:
    linear-gradient(135deg, rgba(255, 255, 255, 0.86), rgba(238, 242, 255, 0.72)),
    radial-gradient(circle at center, rgba(6, 182, 212, 0.13), transparent 22rem);
  cursor: pointer;
  text-align: center;
  transition: border-color 0.2s, transform 0.2s, box-shadow 0.2s;
}

.drop-zone::before {
  display: grid;
  width: 76px;
  height: 76px;
  margin: 0 auto 16px;
  place-items: center;
  border-radius: 24px;
  background: linear-gradient(135deg, #eef2ff, #ecfeff);
  color: var(--primary);
  content: "↓";
  font-size: 2.2rem;
  font-weight: 900;
  box-shadow: inset 0 0 0 1px rgba(79, 70, 229, 0.12), 0 18px 34px rgba(15, 23, 42, 0.08);
}

.drop-zone:hover,
.drop-zone.dragover {
  border-color: var(--primary);
  transform: translateY(-2px);
  box-shadow: 0 22px 55px rgba(79, 70, 229, 0.12);
}

.drop-zone input {
  position: absolute;
  inline-size: 1px;
  block-size: 1px;
  opacity: 0;
  pointer-events: none;
}

.drop-zone strong,
.drop-zone span {
  display: block;
}

.drop-zone strong {
  font-size: 1.5rem;
  letter-spacing: -0.035em;
}

.drop-zone span {
  margin-top: 9px;
  color: var(--muted);
}

.controls {
  display: grid;
  grid-template-columns: repeat(4, minmax(0, 1fr));
  gap: 16px;
  margin-top: 22px;
}

label {
  display: grid;
  gap: 9px;
  color: #344054;
  font-weight: 800;
}

input,
select,
button {
  font: inherit;
}

.inline-input,
select {
  display: flex;
  align-items: center;
  min-height: 54px;
  border: 1px solid rgba(148, 163, 184, 0.32);
  border-radius: 18px;
  background: rgba(255, 255, 255, 0.88);
  overflow: hidden;
  box-shadow: inset 0 1px 0 rgba(255, 255, 255, 0.9);
}

.inline-input:focus-within,
select:focus {
  border-color: rgba(79, 70, 229, 0.56);
  box-shadow: 0 0 0 4px rgba(79, 70, 229, 0.11);
}

.inline-input input {
  width: 100%;
  border: 0;
  outline: 0;
  padding: 13px 4px 13px 15px;
  background: transparent;
}

.inline-input span {
  padding-right: 15px;
  color: var(--muted);
  font-weight: 800;
}

select {
  width: 100%;
  padding: 0 15px;
  outline: 0;
}

.primary-btn,
.download-btn {
  border: 0;
  border-radius: 18px;
  background: linear-gradient(135deg, var(--primary), #2563eb);
  color: #fff;
  font-weight: 900;
  cursor: pointer;
  box-shadow: 0 18px 36px rgba(79, 70, 229, 0.24);
  transition: transform 0.2s, box-shadow 0.2s, filter 0.2s;
}

.primary-btn {
  align-self: end;
  min-height: 54px;
}

.primary-btn:disabled {
  cursor: not-allowed;
  opacity: 0.45;
  box-shadow: none;
}

.primary-btn:not(:disabled):hover,
.download-btn:hover {
  filter: brightness(1.04);
  transform: translateY(-2px);
  box-shadow: 0 24px 44px rgba(79, 70, 229, 0.3);
}

.status {
  margin-top: 18px;
  padding: 15px 17px;
  border: 1px solid rgba(148, 163, 184, 0.18);
  border-radius: 18px;
  background: #f8fafc;
  color: var(--muted);
  font-weight: 700;
}

.result-grid,
.card-grid,
.faq-grid,
.stats-section,
.split-section {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 18px;
  margin-top: 22px;
}

.stats-section {
  grid-template-columns: repeat(3, minmax(0, 1fr));
}

.split-section {
  align-items: stretch;
}

.card-grid.three {
  grid-template-columns: repeat(3, minmax(0, 1fr));
}

.preview-card,
.info-card,
.faq-card,
.stat-card,
.feature-panel {
  padding: 24px;
  border: 1px solid rgba(255, 255, 255, 0.8);
  border-radius: 26px;
  background: var(--panel);
  box-shadow: var(--soft-shadow);
  backdrop-filter: blur(18px);
}

.stat-card strong,
.stat-card span {
  display: block;
}

.stat-card strong {
  font-size: clamp(1.6rem, 3vw, 2.4rem);
  letter-spacing: -0.06em;
}

.stat-card span,
.section-intro {
  color: var(--muted);
  line-height: 1.75;
}

.section-intro {
  max-width: 800px;
  margin-top: -6px;
}

.step-list {
  display: grid;
  gap: 14px;
  padding-left: 22px;
  color: var(--muted);
  line-height: 1.75;
}

.step-list strong,
.feature-panel h3 {
  color: var(--text);
}

.feature-panel ul {
  display: grid;
  gap: 12px;
  padding-left: 20px;
  color: var(--muted);
  line-height: 1.7;
}

.legal-card {
  max-width: 900px;
  border: 1px solid rgba(255, 255, 255, 0.8);
  border-radius: 30px;
  background: var(--panel);
  box-shadow: var(--soft-shadow);
  backdrop-filter: blur(18px);
}

.legal-card h2:not(:first-child) {
  margin-top: 34px;
}

.legal-card a,
.footer a {
  color: var(--primary);
  font-weight: 800;
}

.eyebrow.mini {
  margin-bottom: 14px;
  font-size: 0.7rem;
}

.preview-card h2,
.info-card h3,
.faq-card h3,
.content-section h2 {
  margin-top: 0;
  letter-spacing: -0.04em;
}

.preview-card img {
  width: 100%;
  max-height: 330px;
  object-fit: contain;
  border-radius: 18px;
  background:
    linear-gradient(45deg, #f1f5f9 25%, transparent 25%),
    linear-gradient(-45deg, #f1f5f9 25%, transparent 25%),
    linear-gradient(45deg, transparent 75%, #f1f5f9 75%),
    linear-gradient(-45deg, transparent 75%, #f1f5f9 75%);
  background-color: #fff;
  background-position: 0 0, 0 10px, 10px -10px, -10px 0;
  background-size: 20px 20px;
}

/* 没有图片时隐藏 img 元素，避免显示浏览器默认占位图标 */
.preview-card img:not([src]),
.preview-card img[src=""] {
  display: none;
}

.preview-card p,
.info-card p,
.faq-card p,
.content-section li,
.content-section p {
  color: var(--muted);
  line-height: 1.75;
}

.success {
  border-color: rgba(16, 185, 129, 0.34);
}

/* 精确度可视化结果 */
.precision-result {
  margin-bottom: 14px;
  padding: 16px;
  border: 1px solid rgba(16, 185, 129, 0.2);
  border-radius: 16px;
  background: linear-gradient(135deg, #ecfdf5, #f0fdf4);
}

.precision-header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  margin-bottom: 10px;
}

.precision-label {
  font-size: 0.85rem;
  color: var(--muted);
}

.precision-label strong {
  color: var(--text);
  font-weight: 800;
}

.precision-value {
  font-size: 1.15rem;
  font-weight: 900;
  color: #059669;
  letter-spacing: -0.03em;
}

.precision-bar-track {
  position: relative;
  height: 12px;
  background: rgba(148, 163, 184, 0.15);
  border-radius: 999px;
  overflow: visible;
}

.precision-bar-fill {
  height: 100%;
  background: linear-gradient(90deg, #059669, #10b981);
  border-radius: 999px;
  transition: width 0.6s cubic-bezier(0.22, 1, 0.36, 1);
  min-width: 2%;
}

.precision-marker {
  position: absolute;
  top: -3px;
  width: 4px;
  height: 18px;
  background: var(--primary);
  border-radius: 2px;
  transform: translateX(-50%);
  transition: left 0.6s cubic-bezier(0.22, 1, 0.36, 1);
}

.precision-marker::before {
  position: absolute;
  top: -18px;
  left: 50%;
  transform: translateX(-50%);
  content: "target";
  font-size: 0.65rem;
  font-weight: 700;
  color: var(--primary);
  white-space: nowrap;
  text-transform: uppercase;
  letter-spacing: 0.05em;
}

.precision-status {
  margin: 8px 0 0 !important;
  font-size: 0.85rem !important;
  font-weight: 700 !important;
  color: #059669 !important;
}

/* 相关工具推荐 */
.related-tools {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  margin-top: 14px;
  padding-top: 12px;
  border-top: 1px solid rgba(148, 163, 184, 0.15);
}

.related-tools a {
  padding: 7px 13px;
  border: 1px solid rgba(79, 70, 229, 0.2);
  border-radius: 999px;
  background: rgba(238, 242, 255, 0.5);
  color: var(--primary);
  font-size: 0.78rem;
  font-weight: 700;
  transition: background 0.2s, transform 0.15s;
}

.related-tools a:hover {
  background: rgba(79, 70, 229, 0.1);
  transform: translateY(-1px);
}

/* 预设按钮条 */
.preset-bar {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 8px;
  margin-bottom: 14px;
  padding: 12px 16px;
  border: 1px solid rgba(79, 70, 229, 0.12);
  border-radius: 18px;
  background: rgba(238, 242, 255, 0.4);
}

.preset-label {
  font-size: 0.82rem;
  font-weight: 700;
  color: var(--muted);
  margin-right: 4px;
}

.preset-btn {
  padding: 6px 14px;
  border: 1px solid rgba(79, 70, 229, 0.2);
  border-radius: 999px;
  background: #fff;
  color: var(--primary);
  font-size: 0.78rem;
  font-weight: 700;
  cursor: pointer;
  transition: background 0.2s, transform 0.15s;
}

.preset-btn:hover {
  background: rgba(79, 70, 229, 0.08);
  transform: translateY(-1px);
}

/* 对比滑块 */
.compare-slider {
  margin-top: 20px;
  padding: 18px;
  border: 1px solid rgba(148, 163, 184, 0.15);
  border-radius: 22px;
  background: var(--panel);
}

.compare-slider h3 {
  margin: 0 0 12px;
  font-size: 0.95rem;
  letter-spacing: -0.02em;
}

.compare-container {
  position: relative;
  overflow: hidden;
  border-radius: 14px;
  aspect-ratio: auto;
  max-height: 400px;
  user-select: none;
  touch-action: none;
}

.compare-img {
  display: block;
  width: 100%;
  height: 100%;
  object-fit: contain;
  position: absolute;
  top: 0;
  left: 0;
}

.compare-handle {
  position: absolute;
  top: 0;
  left: 50%;
  width: 40px;
  height: 100%;
  transform: translateX(-50%);
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  cursor: ew-resize;
  z-index: 2;
}

.compare-line {
  flex: 1;
  width: 2px;
  background: #fff;
  box-shadow: 0 0 4px rgba(0,0,0,0.3);
}

.compare-arrows {
  display: grid;
  place-items: center;
  width: 32px;
  height: 32px;
  border-radius: 50%;
  background: #fff;
  box-shadow: 0 2px 8px rgba(0,0,0,0.2);
  font-size: 1rem;
  color: var(--text);
  flex-shrink: 0;
}

.compare-label-left,
.compare-label-right {
  position: absolute;
  bottom: 10px;
  padding: 4px 10px;
  border-radius: 999px;
  background: rgba(0,0,0,0.55);
  color: #fff;
  font-size: 0.72rem;
  font-weight: 700;
  z-index: 1;
}

.compare-label-left { left: 10px; }
.compare-label-right { right: 10px; }

/* 批量压缩结果 */
.batch-item {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 12px;
  padding: 12px 16px;
  border: 1px solid rgba(148, 163, 184, 0.15);
  border-radius: 14px;
  margin-bottom: 8px;
  background: rgba(255,255,255,0.6);
}

.batch-item-info {
  display: flex;
  flex-direction: column;
  gap: 2px;
  min-width: 0;
}

.batch-item-info strong {
  font-size: 0.85rem;
  color: var(--text);
  overflow: hidden;
  text-overflow: ellipsis;
  white-space: nowrap;
}

.batch-item-info span {
  font-size: 0.78rem;
  color: var(--muted);
}

.download-btn-sm {
  padding: 7px 14px;
  border: 1px solid rgba(79, 70, 229, 0.2);
  border-radius: 999px;
  background: rgba(79, 70, 229, 0.06);
  color: var(--primary);
  font-size: 0.78rem;
  font-weight: 700;
  text-decoration: none;
  white-space: nowrap;
  transition: background 0.2s;
}

.download-btn-sm:hover {
  background: rgba(79, 70, 229, 0.14);
}

/* 暗色模式开关 */
.dark-toggle-label {
  display: flex;
  align-items: center;
  cursor: pointer;
  margin-left: 8px;
}

.dark-toggle-label input {
  display: none;
}

.dark-toggle-track {
  position: relative;
  width: 42px;
  height: 22px;
  border-radius: 999px;
  background: rgba(148, 163, 184, 0.3);
  transition: background 0.3s;
}

.dark-toggle-thumb {
  position: absolute;
  top: 2px;
  left: 2px;
  width: 18px;
  height: 18px;
  border-radius: 50%;
  background: #fff;
  box-shadow: 0 1px 3px rgba(0,0,0,0.15);
  transition: transform 0.3s;
  display: flex;
  align-items: center;
  justify-content: center;
  overflow: hidden;
}

.dark-toggle-thumb .icon-sun {
  color: #f59e0b;
  display: none;
}

.dark-toggle-thumb .icon-moon {
  color: #475467;
  display: block;
}

/* 切换到暗色模式：thumb 右移 + 切换为太阳图标 */
.dark-toggle-label input:checked + .dark-toggle-track {
  background: var(--primary);
}

.dark-toggle-label input:checked + .dark-toggle-track .dark-toggle-thumb {
  transform: translateX(20px);
}

.dark-toggle-label input:checked + .dark-toggle-track .dark-toggle-thumb .icon-sun {
  display: block;
}

.dark-toggle-label input:checked + .dark-toggle-track .dark-toggle-thumb .icon-moon {
  display: none;
}

/* 博客文章样式 */
.blog-body {
  background: var(--bg);
}

.blog-article {
  max-width: 760px;
  margin: 0 auto;
  padding: 40px 22px;
  background: var(--panel);
  border-radius: 22px;
  box-shadow: var(--soft-shadow);
}

.blog-article h1 {
  font-size: clamp(1.6rem, 3vw, 2.2rem);
  letter-spacing: -0.03em;
  margin-bottom: 8px;
}

.blog-article h2 {
  font-size: 1.3rem;
  margin-top: 32px;
  margin-bottom: 12px;
  letter-spacing: -0.02em;
}

.blog-article h3 {
  font-size: 1.1rem;
  margin-top: 24px;
  margin-bottom: 8px;
}

.blog-article p {
  color: var(--muted);
  line-height: 1.75;
  margin-bottom: 16px;
}

.blog-article ul, .blog-article ol {
  color: var(--muted);
  line-height: 1.75;
  margin-bottom: 16px;
  padding-left: 24px;
}

.blog-article li {
  margin-bottom: 6px;
}

.blog-article table {
  width: 100%;
  border-collapse: collapse;
  margin: 16px 0;
  font-size: 0.85rem;
}

.blog-article th, .blog-article td {
  padding: 10px 14px;
  border: 1px solid rgba(148, 163, 184, 0.2);
  text-align: left;
}

.blog-article th {
  background: rgba(79, 70, 229, 0.06);
  font-weight: 700;
}

.blog-cta {
  margin-top: 32px;
  padding: 24px;
  border: 2px solid rgba(79, 70, 229, 0.2);
  border-radius: 18px;
  background: rgba(238, 242, 255, 0.5);
  text-align: center;
}

.blog-cta p {
  margin-bottom: 12px;
}

/* 分辨率对照表 */
.table-wrapper {
  overflow-x: auto;
  -webkit-overflow-scrolling: touch;
  margin: 16px 0;
}

.ref-table {
  width: 100%;
  border-collapse: collapse;
  font-size: 0.85rem;
}

.ref-table th, .ref-table td {
  padding: 10px 14px;
  border: 1px solid rgba(148, 163, 184, 0.15);
  text-align: center;
}

.ref-table th {
  background: rgba(79, 70, 229, 0.06);
  font-weight: 700;
  color: var(--text);
}

.ref-table td:first-child {
  text-align: left;
  font-weight: 600;
  color: var(--text);
}

/* 暗色模式变量 */
[data-theme="dark"] {
  color-scheme: dark;
  --bg: #0f172a;
  --panel: rgba(30, 41, 59, 0.9);
  --text: #f1f5f9;
  --muted: #94a3b8;
  --primary: #818cf8;
  --soft-shadow: 0 8px 32px rgba(0, 0, 0, 0.3);
}

[data-theme="dark"] .usp-item {
  background: rgba(30, 41, 59, 0.8);
  border-color: rgba(129, 140, 248, 0.2);
}

[data-theme="dark"] .use-case-card {
  background: rgba(30, 41, 59, 0.8);
  border-color: rgba(129, 140, 248, 0.15);
}

[data-theme="dark"] .preset-bar {
  background: rgba(30, 41, 59, 0.6);
}

[data-theme="dark"] .preset-btn {
  background: rgba(30, 41, 59, 0.8);
}

[data-theme="dark"] .compare-slider {
  background: rgba(30, 41, 59, 0.8);
}

[data-theme="dark"] .batch-item {
  background: rgba(30, 41, 59, 0.6);
}

[data-theme="dark"] .blog-article {
  background: rgba(30, 41, 59, 0.9);
}

[data-theme="dark"] .precision-result {
  background: linear-gradient(135deg, rgba(6, 78, 59, 0.3), rgba(30, 41, 59, 0.6));
  border-color: rgba(16, 185, 129, 0.3);
}

[data-theme="dark"] .target-locked {
  background: linear-gradient(135deg, rgba(30, 41, 59, 0.8), rgba(30, 41, 59, 0.6));
  border-color: rgba(129, 140, 248, 0.3);
}

[data-theme="dark"] .ref-table th {
  background: rgba(129, 140, 248, 0.1);
}

[data-theme="dark"] .blog-cta {
  background: rgba(30, 41, 59, 0.6);
  border-color: rgba(129, 140, 248, 0.3);
}

/* 暗色模式：导航栏 */
[data-theme="dark"] .site-header {
  background: rgba(15, 23, 42, 0.88);
  border-bottom-color: rgba(51, 65, 85, 0.6);
}

[data-theme="dark"] .brand {
  color: #f1f5f9;
}

[data-theme="dark"] .nav-link-plain,
[data-theme="dark"] .nav-drop-btn {
  color: #cbd5e1;
}

[data-theme="dark"] .nav-link-plain:hover,
[data-theme="dark"] .nav-drop-btn:hover {
  color: var(--primary);
  background: rgba(129, 140, 248, 0.12);
}

[data-theme="dark"] .nav-drop-menu {
  background: rgba(30, 41, 59, 0.96);
  border-color: rgba(51, 65, 85, 0.5);
  box-shadow: 0 12px 32px rgba(0, 0, 0, 0.4);
}

[data-theme="dark"] .nav-drop-menu a {
  color: #cbd5e1;
}

[data-theme="dark"] .nav-drop-menu a:hover {
  background: rgba(129, 140, 248, 0.12);
  color: var(--primary);
}

/* 暗色模式：开关图标颜色 */
[data-theme="dark"] .dark-toggle-thumb .icon-moon {
  color: #e2e8f0;
}

[data-theme="dark"] .dark-toggle-thumb .icon-sun {
  color: #fbbf24;
}

/* 暗色模式：工具区 */
[data-theme="dark"] .tool-card {
  background: rgba(30, 41, 59, 0.9);
  border-color: rgba(51, 65, 85, 0.5);
}

[data-theme="dark"] .drop-zone {
  border-color: rgba(51, 65, 85, 0.5);
  background: rgba(15, 23, 42, 0.4);
}

[data-theme="dark"] .drop-zone.dragover {
  border-color: var(--primary);
  background: rgba(79, 70, 229, 0.08);
}

[data-theme="dark"] .status {
  color: #94a3b8;
  background: rgba(15, 23, 42, 0.5);
}

[data-theme="dark"] .preview-card {
  background: rgba(30, 41, 59, 0.85);
  border-color: rgba(51, 65, 85, 0.5);
}

[data-theme="dark"] .preview-card h2 {
  color: #e2e8f0;
}

[data-theme="dark"] .inline-input input,
[data-theme="dark"] .inline-input select {
  background: rgba(15, 23, 42, 0.6);
  border-color: rgba(51, 65, 85, 0.5);
  color: #e2e8f0;
}

.download-btn {
  display: inline-flex;
  margin-top: 10px;
  padding: 14px 18px;
}

.info-card {
  transition: transform 0.2s, border-color 0.2s, box-shadow 0.2s;
}

.info-card:hover {
  border-color: rgba(79, 70, 229, 0.38);
  transform: translateY(-3px);
  box-shadow: 0 22px 54px rgba(79, 70, 229, 0.12);
}

.content-section h2 {
  font-size: clamp(1.8rem, 3vw, 2.8rem);
}

.footer {
  max-width: 1180px;
  margin: 34px auto 0;
  padding: 32px 22px 48px;
  color: var(--muted);
  text-align: center;
}

.footer-inner {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 14px;
}

.footer-brand {
  font-weight: 800;
  font-size: 1.05rem;
  color: var(--text);
  margin: 0;
}

.footer-links {
  display: flex;
  flex-wrap: wrap;
  justify-content: center;
  gap: 6px 18px;
}

.footer-links a {
  color: var(--muted);
  font-weight: 700;
  font-size: 0.9rem;
  transition: color 0.2s;
}

.footer-links a:hover {
  color: var(--primary);
}

.footer-copy {
  margin: 0;
  font-size: 0.85rem;
  opacity: 0.7;
}

/* 广告位样式 */
.ad-slot {
  display: flex;
  justify-content: center;
  margin: 0 auto;
  padding: 0 22px;
  max-width: 1180px;
}

/* 广告加载完成后恢复 padding */
.ad-slot:has(ins:not(:empty)) {
  padding: 12px 22px;
}

.ad-leaderboard {
  min-height: 90px;
}

.ad-sidebar {
  min-height: 0;
}

/* 广告加载完成后自动撑开 */
.ad-sidebar:has(ins:not(:empty)) {
  min-height: 250px;
}

/* 汉堡菜单 */
.nav-toggle {
  display: none;
  flex-direction: column;
  justify-content: center;
  gap: 5px;
  width: 40px;
  height: 40px;
  padding: 8px;
  border: none;
  border-radius: 8px;
  background: transparent;
  cursor: pointer;
  position: relative;
  z-index: 100;
}

.nav-toggle span {
  display: block;
  width: 100%;
  height: 2.5px;
  border-radius: 3px;
  background: var(--text);
  transition: transform 0.25s, opacity 0.25s;
}

.nav-toggle[aria-expanded="true"] span:nth-child(1) {
  transform: translateY(7.5px) rotate(45deg);
}

.nav-toggle[aria-expanded="true"] span:nth-child(2) {
  opacity: 0;
}

.nav-toggle[aria-expanded="true"] span:nth-child(3) {
  transform: translateY(-7.5px) rotate(-45deg);
}

@media (max-width: 900px) {
  .nav-toggle {
    display: flex;
  }

  .nav-links {
    display: none;
    flex-direction: column;
    width: 100%;
    gap: 0;
    padding-top: 12px;
    border-top: 1px solid var(--border);
  }

  .nav-links.nav-open {
    display: flex;
  }

  .nav-dropdown {
    padding-bottom: 0;
    margin-bottom: 0;
    border-bottom: 1px solid rgba(148, 163, 184, 0.15);
  }

  .nav-drop-btn {
    width: 100%;
    justify-content: space-between;
    padding: 12px 14px;
    border-radius: 12px;
  }

  .nav-drop-menu {
    position: static;
    transform: none;
    min-width: auto;
    padding: 4px 8px 12px 20px;
    border: none;
    background: transparent;
    box-shadow: none;
    gap: 2px;
  }

  /* 移动端：点击展开/收起 */
  .nav-dropdown > .nav-drop-menu {
    display: none;
  }

  .nav-dropdown.nav-drop-open > .nav-drop-menu {
    display: flex;
  }

  .nav-link-plain {
    padding: 12px 14px;
    border-radius: 12px;
  }

  .hero {
    padding-top: 52px;
  }

  .controls,
  .result-grid,
  .card-grid,
  .card-grid.three,
  .faq-grid,
  .stats-section,
  .split-section,
  .use-case-grid {
    grid-template-columns: 1fr;
  }

  .tool-card {
    padding: 18px;
    border-radius: 26px;
  }

  .drop-zone {
    min-height: 220px;
  }
}