:root {
  --white: #ffffff;
  --off-white: #f8f9fa;
  --light: #e9ecef;
  --border: #dee2e6;
  --text: #1a1a2e;
  --text2: #6c757d;
  --text3: #adb5bd;
  --blue: #0d6efd;
  --blue-hover: #0b5ed7;
  --blue-light: rgba(13, 110, 253, 0.06);
  --green: #198754;
  --shadow-sm: 0 1px 3px rgba(0,0,0,0.04);
  --radius: 12px;
  --radius-sm: 8px;
  --max-w: 1100px;
  --ff: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, "Noto Sans SC", sans-serif;
}

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

html { scroll-behavior: smooth; font-size: 16px; }

body {
  font-family: var(--ff);
  background: var(--white);
  color: var(--text);
  line-height: 1.7;
  -webkit-font-smoothing: antialiased;
}

img { max-width: 100%; height: auto; display: block; }
a { color: var(--blue); text-decoration: none; transition: color 0.2s; }
a:hover { color: var(--blue-hover); }
ul { list-style: none; }

.wrap {
  width: 100%;
  max-width: var(--max-w);
  margin: 0 auto;
  padding: 0 24px;
}

/* ===== Navigation ===== */
.nav {
  position: sticky;
  top: 0;
  z-index: 100;
  background: rgba(255,255,255,0.96);
  backdrop-filter: blur(12px);
  border-bottom: 1px solid var(--light);
}
.nav-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 64px;
  max-width: var(--max-w);
  margin: 0 auto;
  padding: 0 24px;
}
.nav-logo {
  font-size: 1.25rem;
  font-weight: 700;
  color: var(--text);
  display: flex;
  align-items: center;
  gap: 8px;
}
.nav-logo:hover { color: var(--text); }
.nav-logo mark {
  width: 30px;
  height: 30px;
  background: var(--blue);
  color: #fff;
  border-radius: 6px;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 0.85rem;
  font-weight: 700;
  font-style: normal;
}
.nav-links {
  display: flex;
  align-items: center;
  gap: 28px;
}
.nav-links a {
  font-size: 0.875rem;
  font-weight: 500;
  color: var(--text2);
  padding: 4px 0;
}
.nav-links a:hover,
.nav-links a.active {
  color: var(--text);
}
.nav-cta a {
  font-size: 0.813rem;
  font-weight: 600;
}
.nav-toggle {
  display: none;
  background: none;
  border: none;
  cursor: pointer;
  padding: 4px;
}
.nav-toggle span {
  display: block;
  width: 20px;
  height: 2px;
  background: var(--text);
  margin: 5px 0;
  border-radius: 1px;
  transition: all 0.2s;
}

/* ===== Buttons ===== */
.btn {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  padding: 10px 24px;
  border: none;
  border-radius: var(--radius-sm);
  font-size: 0.9rem;
  font-weight: 600;
  font-family: var(--ff);
  cursor: pointer;
  transition: all 0.2s;
  text-decoration: none;
  line-height: 1.4;
}
.btn-primary {
  background: var(--blue);
  color: #fff;
}
.btn-primary:hover {
  background: var(--blue-hover);
  color: #fff;
}
.btn-outline {
  background: transparent;
  color: var(--text);
  border: 1.5px solid var(--border);
}
.btn-outline:hover {
  border-color: var(--blue);
  color: var(--blue);
}
.btn-lg {
  padding: 14px 32px;
  font-size: 1rem;
}
.btn-sm {
  padding: 7px 16px;
  font-size: 0.813rem;
}

/* ===== Hero ===== */
.hero {
  padding: 100px 0 64px;
  text-align: center;
}
.hero h1 {
  font-size: 3rem;
  font-weight: 800;
  letter-spacing: -0.02em;
  line-height: 1.15;
  margin-bottom: 16px;
  max-width: 720px;
  margin-left: auto;
  margin-right: auto;
}
.hero h1 em {
  font-style: normal;
  color: var(--blue);
}
.hero p {
  font-size: 1.1rem;
  color: var(--text2);
  max-width: 560px;
  margin: 0 auto 32px;
  line-height: 1.7;
}
.hero-actions {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 12px;
  flex-wrap: wrap;
}
.hero-note {
  margin-top: 20px;
  font-size: 0.8rem;
  color: var(--text3);
}

/* ===== Ticker ===== */
.ticker {
  border-top: 1px solid var(--light);
  border-bottom: 1px solid var(--light);
  background: var(--off-white);
}
.ticker-inner {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  max-width: var(--max-w);
  margin: 0 auto;
}
.ticker-item {
  padding: 24px 20px;
  text-align: center;
  border-right: 1px solid var(--light);
}
.ticker-item:last-child { border-right: none; }
.ticker-num {
  font-size: 1.75rem;
  font-weight: 700;
  color: var(--blue);
}
.ticker-label {
  font-size: 0.8rem;
  color: var(--text3);
  margin-top: 2px;
}

/* ===== Sections ===== */
.sec { padding: 72px 0; }
.sec-light { background: var(--off-white); }
.sec-head {
  text-align: center;
  max-width: 600px;
  margin: 0 auto 44px;
}
.sec-head span {
  display: inline-block;
  font-size: 0.75rem;
  font-weight: 600;
  color: var(--blue);
  text-transform: uppercase;
  letter-spacing: 1px;
  margin-bottom: 12px;
}
.sec-head h2 {
  font-size: 1.75rem;
  font-weight: 700;
  margin-bottom: 10px;
  letter-spacing: -0.01em;
}
.sec-head p {
  color: var(--text2);
  font-size: 0.95rem;
  line-height: 1.7;
}

/* ===== Feature Grid ===== */
.grid-3 {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 20px;
}
.grid-item {
  background: var(--white);
  border: 1px solid var(--light);
  border-radius: var(--radius);
  padding: 28px 24px;
  transition: border-color 0.2s, box-shadow 0.2s;
}
.grid-item:hover {
  border-color: var(--blue);
  box-shadow: var(--shadow-sm);
}
.grid-icon {
  font-size: 1.5rem;
  margin-bottom: 14px;
  display: block;
}
.grid-item h3 {
  font-size: 1rem;
  font-weight: 600;
  margin-bottom: 6px;
}
.grid-item p {
  font-size: 0.875rem;
  color: var(--text2);
  line-height: 1.6;
}

/* ===== Steps ===== */
.steps {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 16px;
}
.step {
  text-align: center;
  padding: 24px 16px;
  border: 1px solid var(--light);
  border-radius: var(--radius);
  background: var(--white);
}
.step em {
  display: flex;
  align-items: center;
  justify-content: center;
  width: 36px;
  height: 36px;
  border-radius: 50%;
  background: var(--blue);
  color: #fff;
  font-style: normal;
  font-size: 0.85rem;
  font-weight: 700;
  margin: 0 auto 12px;
}
.step h3 {
  font-size: 0.95rem;
  font-weight: 600;
  margin-bottom: 4px;
}
.step p {
  font-size: 0.8rem;
  color: var(--text2);
}

/* ===== Pricing ===== */
.plan-3 {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 20px;
  max-width: 900px;
  margin: 0 auto;
}
.plan {
  background: var(--white);
  border: 1px solid var(--light);
  border-radius: var(--radius);
  padding: 28px 24px;
  text-align: center;
  transition: border-color 0.2s;
}
.plan:hover {
  border-color: var(--blue);
}
.plan.pop {
  border-color: var(--blue);
  background: var(--blue-light);
  position: relative;
}
.plan.pop::before {
  content: '推荐';
  position: absolute;
  top: -10px;
  left: 50%;
  transform: translateX(-50%);
  background: var(--blue);
  color: #fff;
  font-size: 0.7rem;
  font-weight: 600;
  padding: 2px 14px;
  border-radius: 100px;
}
.plan-name {
  font-size: 0.95rem;
  font-weight: 600;
  margin-bottom: 2px;
}
.plan-type {
  font-size: 0.75rem;
  color: var(--text3);
  margin-bottom: 14px;
}
.plan-price {
  font-size: 2.25rem;
  font-weight: 700;
  margin-bottom: 2px;
}
.plan-price small {
  font-size: 0.9rem;
  font-weight: 400;
  color: var(--text2);
}
.plan-saving {
  font-size: 0.78rem;
  color: var(--green);
  font-weight: 500;
  margin-bottom: 18px;
}
.plan-ft {
  margin: 14px 0;
}
.plan-ft li {
  padding: 6px 0;
  font-size: 0.85rem;
  color: var(--text2);
  display: flex;
  align-items: center;
  gap: 8px;
  border-bottom: 1px solid var(--light);
  text-align: left;
}
.plan-ft li:last-child { border-bottom: none; }
.plan-ft li::before {
  content: '✓';
  color: var(--green);
  font-weight: 700;
  flex-shrink: 0;
}
.plan .btn { width: 100%; margin-top: 6px; }

/* ===== Reviews ===== */
.rev-2 {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 20px;
}
.rev {
  background: var(--white);
  border: 1px solid var(--light);
  border-radius: var(--radius);
  padding: 24px;
}
.rev-stars {
  color: #ffc107;
  font-size: 0.8rem;
  margin-bottom: 8px;
}
.rev-text {
  font-size: 0.875rem;
  color: var(--text2);
  line-height: 1.6;
  font-style: italic;
  margin-bottom: 14px;
}
.rev-by {
  display: flex;
  align-items: center;
  gap: 10px;
}
.rev-av {
  width: 32px;
  height: 32px;
  border-radius: 50%;
  background: var(--blue);
  color: #fff;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 0.75rem;
  font-weight: 600;
}
.rev-name { font-weight: 600; font-size: 0.8rem; }
.rev-source { font-size: 0.72rem; color: var(--text3); }

/* ===== CTA ===== */
.cta {
  padding: 64px 0;
  text-align: center;
}
.cta h2 {
  font-size: 1.75rem;
  font-weight: 700;
  margin-bottom: 8px;
}
.cta p {
  color: var(--text2);
  font-size: 1rem;
  margin-bottom: 24px;
}

/* ===== Q&A ===== */
.qa {
  max-width: 660px;
  margin: 0 auto;
}
.qa-item {
  border: 1px solid var(--light);
  border-radius: var(--radius-sm);
  margin-bottom: 8px;
  overflow: hidden;
}
.qa-btn {
  width: 100%;
  padding: 14px 18px;
  background: none;
  border: none;
  cursor: pointer;
  font-size: 0.9rem;
  font-weight: 500;
  color: var(--text);
  font-family: var(--ff);
  text-align: left;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 10px;
}
.qa-btn::after {
  content: '+';
  font-size: 1.1rem;
  color: var(--text3);
  transition: transform 0.2s;
}
.qa-item.open .qa-btn::after {
  content: '−';
}
.qa-panel {
  max-height: 0;
  overflow: hidden;
  transition: max-height 0.3s ease;
}
.qa-panel-inner {
  padding: 0 18px 16px;
  color: var(--text2);
  font-size: 0.85rem;
  line-height: 1.6;
}
.qa-item.open .qa-panel {
  max-height: 260px;
}

/* ===== Story ===== */
.story {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 48px;
  align-items: center;
}
.story-text h2 {
  font-size: 1.5rem;
  font-weight: 700;
  margin-bottom: 12px;
}
.story-text p {
  color: var(--text2);
  font-size: 0.9rem;
  line-height: 1.7;
  margin-bottom: 10px;
}
.story-nums {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 14px;
}
.story-num {
  background: var(--white);
  border: 1px solid var(--light);
  border-radius: var(--radius-sm);
  padding: 18px;
  text-align: center;
}
.story-num strong {
  display: block;
  font-size: 1.5rem;
  font-weight: 700;
  color: var(--blue);
}
.story-num span {
  font-size: 0.78rem;
  color: var(--text3);
}

/* ===== Top ===== */
.top {
  padding: 96px 0 36px;
  text-align: center;
  border-bottom: 1px solid var(--light);
}
.top h1 {
  font-size: 2.25rem;
  font-weight: 700;
  margin-bottom: 8px;
}
.top p {
  color: var(--text2);
  font-size: 1rem;
  max-width: 500px;
  margin: 0 auto;
}

/* ===== Platform Cards ===== */
.grid-app {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 16px;
}
.app-card {
  background: var(--white);
  border: 1px solid var(--light);
  border-radius: var(--radius);
  padding: 24px 20px;
  text-align: center;
  transition: border-color 0.2s;
}
.app-card:hover {
  border-color: var(--blue);
}
.app-ic {
  width: 48px;
  height: 48px;
  margin: 0 auto 12px;
  border-radius: 12px;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 1.3rem;
}
.app-card h3 {
  font-size: 0.95rem;
  font-weight: 600;
  margin-bottom: 2px;
}
.app-card p {
  font-size: 0.75rem;
  color: var(--text3);
  margin-bottom: 12px;
}
.app-card .btn { width: 100%; }

/* ===== Footer ===== */
.ft {
  border-top: 1px solid var(--light);
  padding: 40px 0 24px;
  margin-top: 24px;
}
.ft-inner {
  display: grid;
  grid-template-columns: 2fr 1fr 1fr;
  gap: 36px;
  max-width: var(--max-w);
  margin: 0 auto;
  padding: 0 24px;
}
.ft-brand .nav-logo { margin-bottom: 8px; }
.ft-brand p {
  font-size: 0.8rem;
  color: var(--text3);
  max-width: 260px;
  line-height: 1.5;
}
.ft h4 {
  font-size: 0.75rem;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.5px;
  color: var(--text3);
  margin-bottom: 12px;
}
.ft-links li { margin-bottom: 6px; }
.ft-links a {
  font-size: 0.8rem;
  color: var(--text2);
}
.ft-links a:hover { color: var(--blue); }
.ft-bot {
  max-width: var(--max-w);
  margin: 24px auto 0;
  padding: 16px 24px 0;
  border-top: 1px solid var(--light);
  display: flex;
  justify-content: space-between;
  flex-wrap: wrap;
  gap: 8px;
  font-size: 0.75rem;
  color: var(--text3);
}

/* ===== 404 ===== */
.err {
  min-height: 60vh;
  display: flex;
  align-items: center;
  justify-content: center;
  text-align: center;
  padding: 100px 20px 60px;
}
.err h1 {
  font-size: 4rem;
  font-weight: 800;
  color: var(--blue);
  margin-bottom: 4px;
}
.err h2 {
  font-size: 1.15rem;
  margin-bottom: 8px;
}
.err p {
  color: var(--text2);
  margin-bottom: 20px;
  font-size: 0.9rem;
}

/* ===== Animations ===== */
.show {
  opacity: 0;
  transform: translateY(18px);
  transition: opacity 0.5s ease, transform 0.5s ease;
}
.show.in {
  opacity: 1;
  transform: translateY(0);
}

/* ===== Responsive ===== */
@media (max-width: 1024px) {
  .grid-3 { grid-template-columns: repeat(2, 1fr); }
  .story { grid-template-columns: 1fr; gap: 28px; }
  .steps { grid-template-columns: repeat(2, 1fr); }
}

@media (max-width: 768px) {
  .nav-links {
    display: none;
    position: absolute;
    top: 64px;
    left: 0;
    right: 0;
    background: var(--white);
    flex-direction: column;
    padding: 16px 24px;
    gap: 12px;
    border-bottom: 1px solid var(--light);
    box-shadow: 0 4px 12px rgba(0,0,0,0.06);
  }
  .nav-links.open { display: flex; }
  .nav-toggle { display: block; }
  .nav-cta { display: none; }

  .hero h1 { font-size: 2rem; }
  .hero p { font-size: 0.95rem; }
  .hero { padding: 72px 0 40px; }

  .ticker-inner { grid-template-columns: repeat(2, 1fr); }
  .ticker-item:nth-child(2) { border-right: none; }
  .ticker-item:nth-child(1),
  .ticker-item:nth-child(2) { border-bottom: 1px solid var(--light); }

  .sec-head h2 { font-size: 1.35rem; }
  .grid-3 { grid-template-columns: 1fr; }
  .plan-3 { grid-template-columns: 1fr; max-width: 380px; }
  .rev-2 { grid-template-columns: 1fr; }
  .grid-app { grid-template-columns: 1fr; max-width: 320px; margin: 0 auto; }
  .steps { grid-template-columns: 1fr; }
  .top h1 { font-size: 1.6rem; }

  .ft-inner { grid-template-columns: 1fr; gap: 20px; }
  .ft-bot { flex-direction: column; text-align: center; }
}

@media (max-width: 480px) {
  .wrap { padding: 0 16px; }
  .hero h1 { font-size: 1.65rem; }
  .sec { padding: 48px 0; }
  .ticker-item { padding: 16px 12px; }
}