:root {
  --bg: #ffffff;
  --bg-soft: #f6f8fb;
  --text: #1c2430;
  --muted: #64708a;
  --primary: #2f6bff;
  --primary-dark: #1f57e0;
  --border: #e4e9f1;
  --radius: 12px;
}

* {
  box-sizing: border-box;
}

/* 保证 hidden 属性可靠隐藏元素：
   .legal-modal 等设置了 display:flex，会覆盖浏览器对 [hidden] 的默认 display:none，
   导致首屏被空白弹窗遮罩。这里用 !important 强制 hidden 元素不可见。 */
[hidden] {
  display: none !important;
}

body {
  margin: 0;
  font-family: 'Segoe UI', 'Microsoft YaHei', system-ui, -apple-system, sans-serif;
  color: var(--text);
  background: var(--bg);
  line-height: 1.6;
}

.container {
  max-width: 1080px;
  margin: 0 auto;
  padding: 0 24px;
}

.section {
  padding: 64px 0;
}

.section-title {
  font-size: 28px;
  text-align: center;
  margin: 0 0 36px;
}

.muted {
  color: var(--muted);
}

h1,
h2,
h3,
h4 {
  line-height: 1.3;
}

/* ===== 按钮 ===== */
.btn {
  display: inline-block;
  border: 1px solid var(--border);
  background: #fff;
  color: var(--text);
  text-decoration: none;
  padding: 11px 22px;
  border-radius: 10px;
  font-size: 15px;
  cursor: pointer;
  transition: transform 0.1s, background 0.15s;
}
.btn:hover {
  transform: translateY(-1px);
}
.btn-primary {
  background: var(--primary);
  border-color: var(--primary);
  color: #fff;
}
.btn-primary:hover {
  background: var(--primary-dark);
}
.btn-large {
  padding: 14px 30px;
  font-size: 16px;
}
.btn-small {
  padding: 7px 16px;
  font-size: 14px;
}

/* ===== 顶栏 ===== */
.site-header {
  position: sticky;
  top: 0;
  background: rgba(255, 255, 255, 0.92);
  backdrop-filter: blur(8px);
  border-bottom: 1px solid var(--border);
  z-index: 50;
}
.header-inner {
  display: flex;
  align-items: center;
  height: 60px;
  gap: 24px;
}
.logo {
  font-weight: 700;
  font-size: 17px;
}
.logo-mark {
  color: var(--primary);
}
.header-nav {
  display: flex;
  gap: 20px;
  margin-left: auto;
}
.header-nav a {
  color: var(--muted);
  text-decoration: none;
  font-size: 14px;
}
.header-nav a:hover {
  color: var(--primary);
}

/* ===== 首屏 ===== */
.hero {
  background: linear-gradient(180deg, #f2f6ff, #ffffff);
  padding: 72px 0 64px;
}
.hero-inner {
  display: grid;
  grid-template-columns: 1.1fr 1fr;
  gap: 48px;
  align-items: center;
}
.hero h1 {
  font-size: 38px;
  margin: 0 0 16px;
}
.subtitle {
  font-size: 18px;
  color: var(--muted);
  margin: 0 0 28px;
}
.hero-actions {
  display: flex;
  gap: 14px;
  flex-wrap: wrap;
}
.hero-note {
  color: var(--muted);
  font-size: 13px;
  margin-top: 16px;
}

.hero-compare {
  display: flex;
  align-items: center;
  gap: 12px;
  background: #fff;
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 18px;
  box-shadow: 0 10px 30px rgba(30, 50, 90, 0.08);
}
.compare-col {
  flex: 1;
}
.compare-title {
  font-size: 13px;
  font-weight: 600;
  margin-bottom: 10px;
}
.compare-arrow {
  font-size: 22px;
  color: var(--primary);
}
.file-list {
  list-style: none;
  margin: 0;
  padding: 0;
  font-family: Consolas, monospace;
  font-size: 12px;
}
.file-list li {
  padding: 5px 8px;
  border-radius: 6px;
  margin-bottom: 4px;
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
}
.messy li {
  background: #fdecec;
  color: #a33;
}
.tidy li {
  background: #e9f9ef;
  color: #177245;
}

/* ===== 痛点 ===== */
.pains {
  background: var(--bg-soft);
}
.pain-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(240px, 1fr));
  gap: 16px;
}
.pain-item {
  background: #fff;
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 18px 20px;
  font-size: 15px;
}

/* ===== 功能 ===== */
.feature-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(230px, 1fr));
  gap: 20px;
}
.feature-card {
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 24px;
}
.feature-icon {
  font-size: 30px;
  margin-bottom: 10px;
}
.feature-card h3 {
  margin: 0 0 8px;
  font-size: 18px;
}
.feature-card p {
  margin: 0;
  color: var(--muted);
  font-size: 14px;
}
.privacy-banner {
  margin-top: 32px;
  background: #eef4ff;
  border: 1px solid #cfe0ff;
  border-radius: var(--radius);
  padding: 16px 22px;
  font-size: 15px;
  text-align: center;
}

/* ===== 演示 ===== */
.demo {
  background: var(--bg-soft);
}
.demo-steps {
  display: flex;
  justify-content: center;
  gap: 12px;
  flex-wrap: wrap;
  margin-bottom: 32px;
}
.demo-step {
  background: #fff;
  border: 1px solid var(--border);
  border-radius: 999px;
  padding: 8px 18px;
  font-size: 14px;
  display: flex;
  align-items: center;
  gap: 8px;
}
.step-no {
  background: var(--primary);
  color: #fff;
  width: 22px;
  height: 22px;
  border-radius: 50%;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  font-size: 12px;
}
.demo-video-placeholder {
  max-width: 640px;
  margin: 0 auto;
  aspect-ratio: 16 / 9;
  background: #10151f;
  border-radius: var(--radius);
  color: #fff;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  gap: 12px;
}
.play-icon {
  width: 64px;
  height: 64px;
  border-radius: 50%;
  background: rgba(255, 255, 255, 0.15);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 24px;
}
.demo-video {
  max-width: 640px;
  width: 100%;
  margin: 0 auto;
  display: block;
  aspect-ratio: 16 / 9;
  border-radius: var(--radius);
  background: #10151f;
}

/* ===== 适用人群 ===== */
.audience-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
  gap: 16px;
  text-align: center;
}
.audience-item {
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 24px 16px;
  font-weight: 600;
}
.audience-item span {
  display: block;
  margin-top: 6px;
  color: var(--muted);
  font-weight: 400;
  font-size: 13px;
}

/* ===== 价格 ===== */
.pricing {
  background: var(--bg-soft);
}
.pricing-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
  gap: 20px;
  max-width: 900px;
  margin: 0 auto;
}
.price-card {
  background: #fff;
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 28px 24px;
  text-align: center;
  position: relative;
  display: flex;
  flex-direction: column;
}
.price-card.highlight {
  border: 2px solid var(--primary);
  box-shadow: 0 10px 30px rgba(47, 107, 255, 0.15);
}
.recommend {
  position: absolute;
  top: -13px;
  left: 50%;
  transform: translateX(-50%);
  background: var(--primary);
  color: #fff;
  font-size: 12px;
  padding: 3px 14px;
  border-radius: 999px;
}
.price {
  font-size: 36px;
  font-weight: 700;
  margin: 8px 0 0;
}
.price .unit {
  font-size: 15px;
  color: var(--muted);
  font-weight: 400;
}
.price-sub {
  color: var(--muted);
  font-size: 13px;
}
.price-card ul {
  list-style: none;
  padding: 0;
  margin: 18px 0 22px;
  color: var(--muted);
  font-size: 14px;
  flex: 1;
}
.price-card li {
  margin: 6px 0;
}
.price-card li::before {
  content: '✓ ';
  color: #2fa46a;
}
.pricing-note {
  text-align: center;
  color: var(--muted);
  margin-top: 28px;
  font-size: 14px;
}

/* ===== 下载 ===== */
.download-inner {
  text-align: center;
}
.download {
  background: linear-gradient(120deg, #2f6bff, #5b8bff);
  color: #fff;
}
.download h2 {
  color: #fff;
  font-size: 28px;
  margin: 0 0 22px;
}
.download .btn-primary {
  background: #fff;
  color: var(--primary);
  border-color: #fff;
}
.download .muted {
  color: rgba(255, 255, 255, 0.85);
  margin-top: 18px;
}
.download .muted a {
  color: #fff;
}
.download-notice {
  margin: 20px auto 0;
  max-width: 580px;
  background: rgba(255, 255, 255, 0.14);
  border: 1px solid rgba(255, 255, 255, 0.45);
  color: #fff;
  border-radius: 10px;
  padding: 12px 18px;
  font-size: 14px;
  line-height: 1.7;
}

/* ===== FAQ ===== */
.faq-list {
  max-width: 760px;
  margin: 0 auto;
}
.faq-item {
  border: 1px solid var(--border);
  border-radius: var(--radius);
  margin-bottom: 12px;
  padding: 4px 20px;
}
.faq-item summary {
  cursor: pointer;
  font-weight: 600;
  padding: 12px 0;
}
.faq-item p {
  margin: 0 0 16px;
  color: var(--muted);
}

/* ===== 反馈 ===== */
.feedback {
  background: var(--bg-soft);
}
.feedback-form {
  max-width: 620px;
  margin: 0 auto;
  display: flex;
  flex-direction: column;
  gap: 14px;
}
.feedback-form label {
  display: flex;
  flex-direction: column;
  gap: 6px;
  font-size: 14px;
  font-weight: 600;
}
.feedback-form input,
.feedback-form select,
.feedback-form textarea {
  font: inherit;
  font-weight: 400;
  padding: 10px 12px;
  border: 1px solid var(--border);
  border-radius: 8px;
  background: #fff;
}
.form-row-2 {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 14px;
}
.feedback-form .btn {
  align-self: flex-start;
}
.form-status {
  font-size: 14px;
  color: #177245;
  min-height: 20px;
  margin: 0;
}
.form-status.is-error {
  color: #c0392b;
}
.form-actions {
  display: flex;
  align-items: center;
  gap: 12px;
  flex-wrap: wrap;
}
.plan-indicator {
  margin: 0;
  font-size: 14px;
  color: var(--muted);
}
.plan-label {
  font-weight: 700;
  color: var(--primary);
}
.early-access-cta {
  margin-left: 6px;
  vertical-align: middle;
}

/* ===== 页脚 ===== */
.site-footer {
  border-top: 1px solid var(--border);
  padding: 40px 0 24px;
}
.footer-cols {
  display: grid;
  grid-template-columns: 2fr 1fr 1fr;
  gap: 24px;
}
.footer-cols h4 {
  margin: 0 0 10px;
}
.footer-cols a {
  color: var(--muted);
}
.footer-bottom {
  margin-top: 28px;
  padding-top: 16px;
  border-top: 1px solid var(--border);
  font-size: 13px;
  text-align: center;
}

/* ===== 法律弹窗 ===== */
.legal-modal {
  position: fixed;
  inset: 0;
  background: rgba(15, 23, 42, 0.5);
  display: flex;
  align-items: center;
  justify-content: center;
  z-index: 100;
  padding: 20px;
}
.legal-box {
  background: #fff;
  border-radius: 12px;
  max-width: 680px;
  width: 100%;
  max-height: 82vh;
  overflow-y: auto;
  padding: 28px 32px;
  position: relative;
}
.legal-close {
  position: absolute;
  top: 12px;
  right: 16px;
  border: none;
  background: transparent;
  font-size: 26px;
  cursor: pointer;
  color: var(--muted);
}
.legal-box h3 {
  margin-top: 0;
}

/* ===== 整理效果对比 ===== */
.compare-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 16px;
}
.compare-block {
  background: #fff;
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 20px 22px;
  box-shadow: 0 6px 20px rgba(30, 50, 90, 0.06);
}
.compare-block h3 {
  font-size: 16px;
  margin-bottom: 14px;
}
.compare-pair {
  display: flex;
  align-items: center;
  gap: 12px;
}
.file-list.tree li {
  white-space: normal;
}
.file-list .indent {
  margin-left: 22px;
  color: var(--muted);
}
.size-rows {
  display: flex;
  flex-direction: column;
  gap: 8px;
}
.size-row {
  display: grid;
  grid-template-columns: 1.2fr auto auto auto;
  align-items: center;
  gap: 10px;
  font-size: 13px;
  padding: 8px 12px;
  background: var(--bg-soft);
  border-radius: 8px;
}
.size-before {
  color: var(--muted);
  text-decoration: line-through;
}
.size-arrow {
  color: var(--primary);
}
.size-after {
  color: #177245;
  font-weight: 600;
}
.size-total {
  margin-top: 6px;
  padding: 10px 12px;
  background: #e9f9ef;
  border: 1px solid #7ee2a8;
  border-radius: 8px;
  font-size: 13px;
}

/* ===== 响应式 ===== */
@media (max-width: 820px) {
  .hero-inner {
    grid-template-columns: 1fr;
  }
  .hero h1 {
    font-size: 28px;
  }
  .header-nav {
    display: none;
  }
  .footer-cols {
    grid-template-columns: 1fr;
  }
  .form-row-2 {
    grid-template-columns: 1fr;
  }
  .hero-compare {
    flex-direction: column;
  }
  .compare-arrow {
    transform: rotate(90deg);
  }
  .compare-grid {
    grid-template-columns: 1fr;
  }
  .compare-pair {
    flex-direction: column;
  }
}