/* ===== CSS Variables ===== */
:root {
  --bg: #fafafa;
  --surface: #ffffff;
  --ink: #1a1a1a;
  --muted: #6b7280;
  --accent: #0756cc;
  --accent-contrast: #ffffff;
  --accent-orange: #ff7a00;
  --border-w: 2px;
  --radius: 4px;
  --shadow-hard: 4px 4px 0 var(--ink);
  --shadow-hard-sm: 2px 2px 0 var(--ink);
  --font: -apple-system, BlinkMacSystemFont, 'Segoe UI', 'PingFang SC', 'Microsoft YaHei', sans-serif;
  --font-mono: ui-monospace, 'Cascadia Code', 'Source Code Pro', Consolas, monospace;
  --section-gap: clamp(48px, 8vw, 96px);
  --content-max: 1200px;
}

/* ===== Reset ===== */
*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }
html { scroll-behavior: smooth; }
body {
  font-family: var(--font);
  background: var(--bg);
  color: var(--ink);
  line-height: 1.6;
  -webkit-font-smoothing: antialiased;
}
img { max-width: 100%; height: auto; display: block; }
a { color: var(--accent); text-decoration: none; }
ul, ol { list-style: none; }

/* ===== Container ===== */
.container {
  max-width: var(--content-max);
  margin: 0 auto;
  padding: 0 16px;
}

/* ===== Buttons ===== */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 6px;
  padding: 10px 24px;
  font-size: 15px;
  font-weight: 600;
  border: var(--border-w) solid var(--ink);
  border-radius: var(--radius);
  cursor: pointer;
  transition: transform .15s, box-shadow .15s;
  text-decoration: none;
}
.btn-primary {
  background: var(--accent);
  color: var(--accent-contrast);
  box-shadow: var(--shadow-hard);
}
.btn-primary:hover {
  transform: translate(-2px, -2px);
  box-shadow: 6px 6px 0 var(--ink);
}
.btn-outline {
  background: var(--surface);
  color: var(--ink);
  box-shadow: var(--shadow-hard);
}
.btn-outline:hover {
  transform: translate(-2px, -2px);
  box-shadow: 6px 6px 0 var(--ink);
}
.btn-lg {
  padding: 14px 32px;
  font-size: 17px;
}

/* ===== Header ===== */
.site-header {
  position: fixed;
  top: 0; left: 0; right: 0;
  z-index: 100;
  background: var(--surface);
  border-bottom: var(--border-w) solid var(--ink);
}
.header-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 60px;
}
.brand {
  display: flex;
  align-items: center;
  gap: 10px;
  font-weight: 800;
  font-size: 18px;
  color: var(--ink);
}
.brand img { border-radius: 8px; }
.main-nav {
  display: flex;
  gap: 28px;
}
.main-nav a {
  font-size: 14px;
  font-weight: 500;
  color: var(--ink);
  position: relative;
}
.main-nav a::after {
  content: '';
  position: absolute;
  bottom: -4px; left: 0;
  width: 0; height: 2px;
  background: var(--accent);
  transition: width .2s;
}
.main-nav a:hover::after { width: 100%; }
.header-cta { display: flex; }
.menu-toggle {
  display: none;
  background: none;
  border: none;
  font-size: 24px;
  cursor: pointer;
  color: var(--ink);
}

/* ===== Hero ===== */
.hero {
  position: relative;
  padding: calc(60px + var(--section-gap)) 0 var(--section-gap);
  overflow: hidden;
  background: var(--surface);
  border-bottom: var(--border-w) solid var(--ink);
}
.hero-bg {
  position: absolute;
  inset: 0;
  pointer-events: none;
  z-index: 0;
}
.hero-block {
  position: absolute;
  border: var(--border-w) solid var(--ink);
}
.hero-block-1 {
  width: 340px; height: 340px;
  top: -80px; right: -60px;
  background: rgba(7,86,204,0.08);
  transform: rotate(12deg);
}
.hero-block-2 {
  width: 220px; height: 220px;
  bottom: 40px; left: -40px;
  background: rgba(255,122,0,0.08);
  transform: rotate(-8deg);
}
.hero-block-3 {
  width: 160px; height: 160px;
  top: 120px; right: 25%;
  background: rgba(7,86,204,0.05);
  transform: rotate(25deg);
}
.hero-tag {
  position: absolute;
  top: 90px; right: 8%;
  font-family: var(--font-mono);
  font-size: 12px;
  font-weight: 700;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: var(--accent);
  background: var(--surface);
  border: var(--border-w) solid var(--ink);
  padding: 4px 10px;
  border-radius: var(--radius);
  box-shadow: var(--shadow-hard-sm);
  z-index: 1;
}
.hero-tag-2 {
  top: auto; bottom: 80px; right: auto; left: 6%;
  color: var(--accent-orange);
}
.hero-inner {
  position: relative;
  z-index: 2;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 48px;
}
.hero-content { max-width: 520px; }
.badge {
  display: inline-block;
  font-family: var(--font-mono);
  font-size: 12px;
  font-weight: 700;
  letter-spacing: 0.05em;
  color: var(--accent-contrast);
  background: var(--accent);
  border: var(--border-w) solid var(--ink);
  padding: 4px 10px;
  border-radius: var(--radius);
  margin-bottom: 16px;
}
.hero h1 {
  font-size: clamp(28px, 4.5vw, 44px);
  font-weight: 900;
  line-height: 1.15;
  margin-bottom: 16px;
}
.hero-sub {
  font-size: 17px;
  color: var(--muted);
  margin-bottom: 28px;
}
.hero-actions {
  display: flex;
  gap: 14px;
  flex-wrap: wrap;
}
.hero-mockup {
  flex-shrink: 0;
}
.hero-mockup img {
  width: 280px;
  border: var(--border-w) solid var(--ink);
  border-radius: 12px;
  box-shadow: var(--shadow-hard);
}

/* ===== Sections ===== */
.section {
  padding: var(--section-gap) 0;
}
.section-title {
  font-size: clamp(24px, 3.5vw, 32px);
  font-weight: 800;
  text-align: center;
  margin-bottom: 8px;
}
.section-desc {
  text-align: center;
  color: var(--muted);
  font-size: 16px;
  margin-bottom: 40px;
}

/* ===== Showcase ===== */
.showcase { background: var(--bg); }
.showcase-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 20px;
}
.showcase-card {
  background: var(--surface);
  border: var(--border-w) solid var(--ink);
  border-radius: var(--radius);
  padding: 12px;
  box-shadow: var(--shadow-hard-sm);
  transition: transform .15s, box-shadow .15s;
}
.showcase-card:hover {
  transform: translate(-2px, -2px);
  box-shadow: var(--shadow-hard);
}
.showcase-card img {
  width: 100%;
  border-radius: 2px;
  border: var(--border-w) solid var(--ink);
}
.showcase-card figcaption {
  text-align: center;
  font-size: 14px;
  font-weight: 600;
  margin-top: 10px;
}

/* ===== Features ===== */
.features { background: var(--surface); border-top: var(--border-w) solid var(--ink); }
.feature-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 24px;
}
.feature-card {
  background: var(--bg);
  border: var(--border-w) solid var(--ink);
  border-radius: var(--radius);
  padding: 28px;
  box-shadow: var(--shadow-hard-sm);
  transition: transform .15s, box-shadow .15s;
}
.feature-card:hover {
  transform: translate(-2px, -2px);
  box-shadow: var(--shadow-hard);
}
.feature-icon {
  width: 44px; height: 44px;
  display: flex; align-items: center; justify-content: center;
  background: var(--accent);
  color: var(--accent-contrast);
  border: var(--border-w) solid var(--ink);
  border-radius: var(--radius);
  font-size: 22px;
  margin-bottom: 14px;
}
.feature-card h3 {
  font-size: 18px;
  font-weight: 800;
  margin-bottom: 8px;
}
.feature-card p {
  font-size: 14px;
  color: var(--muted);
  line-height: 1.6;
}

/* ===== Steps ===== */
.steps { background: var(--bg); border-top: var(--border-w) solid var(--ink); }
.steps-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 20px;
}
.step-card {
  background: var(--surface);
  border: var(--border-w) solid var(--ink);
  border-radius: var(--radius);
  padding: 28px;
  box-shadow: var(--shadow-hard-sm);
  text-align: center;
}
.step-num {
  display: inline-block;
  font-family: var(--font-mono);
  font-size: 28px;
  font-weight: 900;
  color: var(--accent);
  background: var(--bg);
  border: var(--border-w) solid var(--ink);
  border-radius: var(--radius);
  padding: 6px 14px;
  margin-bottom: 14px;
}
.step-card h3 {
  font-size: 17px;
  font-weight: 800;
  margin-bottom: 8px;
}
.step-card p {
  font-size: 14px;
  color: var(--muted);
}

/* ===== FAQ ===== */
.faq { background: var(--surface); border-top: var(--border-w) solid var(--ink); }
.faq-list { max-width: 720px; margin: 0 auto; }
.faq-item {
  background: var(--bg);
  border: var(--border-w) solid var(--ink);
  border-radius: var(--radius);
  margin-bottom: 12px;
  box-shadow: var(--shadow-hard-sm);
  overflow: hidden;
}
.faq-item summary {
  padding: 18px 20px;
  font-weight: 700;
  font-size: 15px;
  cursor: pointer;
  display: flex;
  align-items: center;
  justify-content: space-between;
  list-style: none;
}
.faq-item summary::-webkit-details-marker { display: none; }
.faq-item summary::after {
  content: '+';
  font-family: var(--font-mono);
  font-size: 20px;
  font-weight: 700;
  color: var(--accent);
}
.faq-item[open] summary::after { content: '-'; }
.faq-item p {
  padding: 0 20px 18px;
  font-size: 14px;
  color: var(--muted);
  line-height: 1.7;
}

/* ===== Reviews ===== */
.reviews { background: var(--bg); border-top: var(--border-w) solid var(--ink); }
.review-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 20px;
}
.review-card {
  background: var(--surface);
  border: var(--border-w) solid var(--ink);
  border-radius: var(--radius);
  padding: 24px;
  box-shadow: var(--shadow-hard-sm);
}
.review-stars {
  color: var(--accent-orange);
  font-size: 16px;
  margin-bottom: 12px;
}
.review-card > p {
  font-size: 15px;
  line-height: 1.7;
  margin-bottom: 16px;
}
.review-card footer {
  display: flex;
  align-items: center;
  justify-content: space-between;
  font-size: 13px;
}
.reviewer {
  font-weight: 700;
  color: var(--ink);
}
.review-time {
  font-family: var(--font-mono);
  color: var(--muted);
  font-size: 12px;
}

/* ===== Download ===== */
.download { background: var(--surface); border-top: var(--border-w) solid var(--ink); }
.download-card {
  max-width: 420px;
  margin: 0 auto;
  background: var(--bg);
  border: var(--border-w) solid var(--ink);
  border-radius: var(--radius);
  padding: 36px;
  text-align: center;
  box-shadow: var(--shadow-hard);
}
.download-logo {
  margin: 0 auto 16px;
  border-radius: 12px;
  border: var(--border-w) solid var(--ink);
}
.download-card h3 {
  font-size: 22px;
  font-weight: 800;
  margin-bottom: 14px;
}
.download-meta {
  display: flex;
  justify-content: center;
  gap: 10px;
  margin-bottom: 24px;
  flex-wrap: wrap;
}
.meta-tag {
  font-family: var(--font-mono);
  font-size: 12px;
  font-weight: 700;
  letter-spacing: 0.05em;
  background: var(--surface);
  border: var(--border-w) solid var(--ink);
  padding: 4px 10px;
  border-radius: var(--radius);
}
.download-btn { margin-bottom: 12px; }
.download-hint {
  font-size: 13px;
  color: var(--muted);
}

/* ===== Footer ===== */
.site-footer {
  background: var(--ink);
  color: var(--accent-contrast);
  padding: 28px 0;
}
.footer-inner {
  text-align: center;
  font-size: 13px;
}
.footer-note {
  margin-top: 6px;
  color: #9ca3af;
  font-size: 12px;
}
.footer-note a { color: #9ca3af; text-decoration: underline; text-underline-offset: 2px; }
.footer-note a:hover { color: var(--accent-orange); }
.footer-links {
  display: flex;
  justify-content: center;
  align-items: center;
  gap: 8px;
  margin-bottom: 12px;
}
.footer-links a {
  color: var(--accent-contrast);
  font-size: 13px;
  text-decoration: underline;
  text-underline-offset: 2px;
}
.footer-links a:hover { color: var(--accent-orange); }
.footer-sep { color: #6b7280; font-size: 12px; }

/* ===== Why Choose (新增板块) ===== */
.why { background: var(--surface); border-top: var(--border-w) solid var(--ink); }
.why-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 24px;
}
.why-card {
  background: var(--bg);
  border: var(--border-w) solid var(--ink);
  border-radius: var(--radius);
  padding: 28px;
  box-shadow: var(--shadow-hard-sm);
  transition: transform .15s, box-shadow .15s;
}
.why-card:hover {
  transform: translate(-2px, -2px);
  box-shadow: var(--shadow-hard);
}
.why-icon {
  width: 44px; height: 44px;
  display: flex; align-items: center; justify-content: center;
  background: var(--accent-orange);
  color: var(--surface);
  border: var(--border-w) solid var(--ink);
  border-radius: var(--radius);
  font-size: 22px;
  margin-bottom: 14px;
}
.why-card h3 {
  font-size: 18px;
  font-weight: 800;
  margin-bottom: 10px;
}
.why-pain {
  font-size: 14px;
  color: var(--muted);
  line-height: 1.6;
  margin-bottom: 12px;
  padding-bottom: 12px;
  border-bottom: 1px dashed #d1d5db;
}
.why-solution {
  font-size: 14px;
  color: var(--ink);
  line-height: 1.6;
  font-weight: 500;
}

/* ===== Compare Table (版本对比表格) ===== */
.compare { background: var(--surface); border-top: var(--border-w) solid var(--ink); }
.compare-table-scroll {
  overflow-x: auto;
  border: var(--border-w) solid var(--ink);
  border-radius: var(--radius);
  box-shadow: var(--shadow-hard);
  background: var(--surface);
  -webkit-overflow-scrolling: touch;
}
.compare-table {
  width: 100%;
  border-collapse: collapse;
  min-width: 640px;
  font-size: 14px;
}
.compare-table thead {
  background: var(--ink);
}
.compare-table thead th {
  color: var(--surface);
  font-weight: 700;
  text-align: left;
  padding: 14px 16px;
  font-size: 14px;
  white-space: nowrap;
}
.compare-table thead th:first-child {
  background: var(--accent);
  color: var(--accent-contrast);
}
.compare-table tbody tr {
  border-bottom: 1px solid #e5e7eb;
}
.compare-table tbody tr:last-child {
  border-bottom: none;
}
.compare-table tbody tr:nth-child(even) {
  background: var(--bg);
}
.compare-table tbody tr:hover {
  background: rgba(7,86,204,0.06);
}
.compare-table td {
  padding: 12px 16px;
  line-height: 1.5;
  color: var(--ink);
  vertical-align: top;
}
.compare-label {
  font-weight: 700;
  white-space: nowrap;
  background: rgba(7,86,204,0.04) !important;
}

/* ===== Scenes (原 Reviews 调整) ===== */
.scenes { background: var(--bg); border-top: var(--border-w) solid var(--ink); }
.scene-note {
  text-align: center;
  font-size: 13px;
  color: var(--muted);
  margin-bottom: 32px;
  padding: 8px 16px;
  background: rgba(7,86,204,0.05);
  border: 1px dashed var(--accent);
  border-radius: var(--radius);
  max-width: 600px;
  margin-left: auto;
  margin-right: auto;
}
.scene-icon {
  width: 44px; height: 44px;
  display: flex; align-items: center; justify-content: center;
  background: var(--accent);
  color: var(--accent-contrast);
  border: var(--border-w) solid var(--ink);
  border-radius: var(--radius);
  font-size: 22px;
  margin-bottom: 14px;
}

/* ===== Legal Pages (隐私政策 / 用户协议) ===== */
.legal-page {
  padding: calc(60px + 48px) 0 48px;
  background: var(--surface);
  min-height: 60vh;
}
.legal-page .container { max-width: 760px; }
.legal-page h1 {
  font-size: clamp(24px, 3.5vw, 32px);
  font-weight: 800;
  margin-bottom: 8px;
}
.legal-updated {
  font-family: var(--font-mono);
  font-size: 13px;
  color: var(--muted);
  margin-bottom: 32px;
  padding-bottom: 16px;
  border-bottom: var(--border-w) solid var(--ink);
}
.legal-page h2 {
  font-size: 18px;
  font-weight: 800;
  margin-top: 32px;
  margin-bottom: 12px;
}
.legal-page p {
  font-size: 15px;
  line-height: 1.8;
  color: var(--ink);
  margin-bottom: 12px;
}
.legal-page p a { text-decoration: underline; text-underline-offset: 2px; }
.legal-list {
  list-style: none;
  margin-bottom: 12px;
}
.legal-list li {
  font-size: 15px;
  line-height: 1.8;
  color: var(--ink);
  padding-left: 24px;
  position: relative;
  margin-bottom: 8px;
}
.legal-list li::before {
  content: '';
  position: absolute;
  left: 0; top: 12px;
  width: 8px; height: 8px;
  background: var(--accent);
  border: 1px solid var(--ink);
  border-radius: 2px;
}

/* ===== Responsive ===== */
@media (max-width: 768px) {
  .main-nav {
    position: fixed;
    top: 60px; left: 0; right: 0;
    background: var(--surface);
    border-bottom: var(--border-w) solid var(--ink);
    flex-direction: column;
    gap: 0;
    padding: 8px 16px;
    transform: translateY(-120%);
    opacity: 0;
    pointer-events: none;
    transition: transform .25s, opacity .25s;
    z-index: 99;
  }
  .main-nav.open {
    transform: translateY(0);
    opacity: 1;
    pointer-events: auto;
  }
  .main-nav a {
    padding: 12px 0;
    border-bottom: 1px solid #e5e7eb;
    font-size: 15px;
  }
  .main-nav a:last-child { border-bottom: none; }
  .header-cta { display: none; }
  .menu-toggle { display: flex; }

  .hero-inner {
    flex-direction: column;
    text-align: center;
  }
  .hero-content { max-width: 100%; }
  .hero-actions { justify-content: center; }
  .hero-mockup img { width: 220px; }
  .hero-block-1 { width: 200px; height: 200px; top: -60px; right: -40px; }
  .hero-block-2 { width: 140px; height: 140px; bottom: 20px; left: -20px; }
  .hero-block-3 { display: none; }
  .hero-tag { right: 4%; top: 70px; }
  .hero-tag-2 { left: 4%; bottom: 60px; }

  .showcase-grid { grid-template-columns: repeat(2, 1fr); }
  .feature-grid { grid-template-columns: 1fr; }
  .why-grid { grid-template-columns: 1fr; }
  .steps-grid { grid-template-columns: 1fr; }
  .review-grid { grid-template-columns: 1fr; }
}

@media (max-width: 480px) {
  .showcase-grid { grid-template-columns: 1fr; }
  .hero-mockup img { width: 180px; }
  .btn-lg { padding: 12px 24px; font-size: 15px; }
}