:root {
  --primary: #ff6a3d;
  --primary-dark: #e85528;
  --secondary: #ffb86b;
  --text: #1f2330;
  --text-soft: #5a6072;
  --bg: #ffffff;
  --bg-alt: #fff7f2;
  --border: #f0e6df;
  --shadow: 0 8px 30px rgba(255, 106, 61, 0.08);
  --radius: 14px;
  --max-w: 1120px;
}

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

html { scroll-behavior: smooth; }

body {
  font-family: -apple-system, BlinkMacSystemFont, "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: var(--max-w);
  margin: 0 auto;
  padding: 0 24px;
}

/* nav */
.nav {
  position: sticky;
  top: 0;
  background: rgba(255, 255, 255, 0.92);
  backdrop-filter: saturate(180%) blur(12px);
  border-bottom: 1px solid var(--border);
  z-index: 100;
}
.nav-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 64px;
}
.brand {
  display: flex;
  align-items: center;
  gap: 10px;
  color: var(--text);
  font-weight: 700;
  font-size: 18px;
}
.brand-mark {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 32px;
  height: 32px;
  border-radius: 8px;
  background: linear-gradient(135deg, var(--primary), var(--secondary));
  color: #fff;
  font-weight: 700;
}
.nav-links {
  display: flex;
  gap: 28px;
}
.nav-links a {
  color: var(--text-soft);
  font-size: 15px;
  font-weight: 500;
}
.nav-links a:hover { color: var(--primary); }

/* hero */
.hero {
  padding: 80px 0 100px;
  background: linear-gradient(180deg, var(--bg-alt) 0%, #fff 100%);
}
.hero-inner {
  display: grid;
  grid-template-columns: 1.1fr 0.9fr;
  gap: 60px;
  align-items: center;
}
.hero-text h1 {
  font-size: 56px;
  line-height: 1.1;
  font-weight: 800;
  letter-spacing: -1px;
  background: linear-gradient(135deg, var(--primary), #ff9456);
  -webkit-background-clip: text;
  background-clip: text;
  color: transparent;
}
.hero-sub {
  margin: 24px 0 36px;
  font-size: 18px;
  color: var(--text-soft);
  max-width: 480px;
}
.hero-actions {
  display: flex;
  gap: 16px;
}
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  height: 48px;
  padding: 0 28px;
  border-radius: 999px;
  font-weight: 600;
  font-size: 15px;
  transition: all .2s ease;
  border: 1px solid transparent;
}
.btn-primary {
  background: var(--primary);
  color: #fff;
  box-shadow: var(--shadow);
}
.btn-primary:hover {
  background: var(--primary-dark);
  color: #fff;
  transform: translateY(-1px);
}
.btn-ghost {
  border-color: var(--border);
  color: var(--text);
  background: #fff;
}
.btn-ghost:hover {
  border-color: var(--primary);
  color: var(--primary);
}

/* hero visual */
.hero-visual {
  display: flex;
  justify-content: center;
}
.phone {
  width: 260px;
  height: 520px;
  background: #1f2330;
  border-radius: 36px;
  padding: 14px;
  box-shadow: 0 30px 60px rgba(31, 35, 48, 0.25);
  position: relative;
}
.phone::before {
  content: "";
  position: absolute;
  top: 14px;
  left: 50%;
  transform: translateX(-50%);
  width: 80px;
  height: 18px;
  background: #1f2330;
  border-radius: 0 0 12px 12px;
  z-index: 2;
}
.phone-screen {
  width: 100%;
  height: 100%;
  background: linear-gradient(180deg, #fff7f2, #ffe8d6);
  border-radius: 24px;
  padding: 40px 16px 16px;
  display: flex;
  flex-direction: column;
  gap: 14px;
}
.screen-card {
  background: #fff;
  border-radius: 12px;
  padding: 14px;
  display: flex;
  flex-direction: column;
  gap: 8px;
  box-shadow: 0 4px 12px rgba(0,0,0,0.04);
}
.dot {
  width: 36px;
  height: 36px;
  border-radius: 50%;
  background: linear-gradient(135deg, var(--primary), var(--secondary));
}
.dot-2 { background: linear-gradient(135deg, #6b9bff, #a4c8ff); }
.dot-3 { background: linear-gradient(135deg, #7ed9a0, #b9f0ce); }
.line {
  height: 8px;
  border-radius: 4px;
  background: #f0e6df;
  width: 100%;
}
.line.short { width: 60%; }

/* sections */
.section { padding: 80px 0; }
.section-alt { background: var(--bg-alt); }
.section-title {
  font-size: 36px;
  font-weight: 700;
  text-align: center;
  letter-spacing: -0.5px;
}
.section-sub {
  text-align: center;
  color: var(--text-soft);
  margin-top: 12px;
  margin-bottom: 48px;
  font-size: 16px;
}

/* grid */
.grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 24px;
}
.card {
  background: #fff;
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 28px;
  transition: all .25s ease;
}
.card:hover {
  transform: translateY(-4px);
  box-shadow: var(--shadow);
  border-color: transparent;
}
.card-icon {
  font-size: 32px;
  margin-bottom: 14px;
}
.card h3 {
  font-size: 18px;
  margin-bottom: 8px;
}
.card p {
  color: var(--text-soft);
  font-size: 14.5px;
}

/* screenshots */
.shot-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
  gap: 24px;
  margin-top: 8px;
}
.shot {
  margin: 0;
  background: linear-gradient(160deg, #f5f7fb 0%, #eef1f7 100%);
  border: 1px solid var(--border);
  border-radius: 20px;
  padding: 24px 20px 18px;
  text-align: center;
  transition: all .25s ease;
}
.shot:hover {
  transform: translateY(-4px);
  box-shadow: var(--shadow);
}
.shot img {
  display: block;
  width: 100%;
  max-width: 260px;
  margin: 0 auto;
  border-radius: 16px;
  box-shadow: 0 10px 30px rgba(20, 30, 60, .12);
}
.shot figcaption {
  margin-top: 14px;
  font-size: 14px;
  color: var(--text-soft);
  font-weight: 500;
}
@media (max-width: 768px) {
  .shot-grid { grid-template-columns: 1fr; }
}

/* download tip */
.download-tip {
  margin-top: 18px;
  font-size: 13px;
  color: var(--text-soft);
  max-width: 520px;
  margin-left: auto;
  margin-right: auto;
  line-height: 1.7;
}

/* download */
.download-inner { text-align: center; }
.download-buttons {
  display: flex;
  justify-content: center;
  gap: 20px;
  margin-top: 16px;
  flex-wrap: wrap;
}
.dl-btn {
  display: inline-flex;
  align-items: center;
  gap: 12px;
  background: #1f2330;
  color: #fff !important;
  padding: 14px 28px;
  border-radius: 12px;
  min-width: 200px;
  transition: all .2s ease;
}
.dl-btn:hover {
  background: #2c3142;
  transform: translateY(-2px);
}
.dl-icon {
  width: 28px;
  height: 28px;
  border-radius: 6px;
  background: linear-gradient(135deg, var(--primary), var(--secondary));
}
.dl-text {
  display: flex;
  flex-direction: column;
  align-items: flex-start;
  line-height: 1.2;
}
.dl-text small {
  font-size: 11px;
  opacity: 0.7;
}
.dl-text strong {
  font-size: 15px;
  font-weight: 600;
}

/* about & contact */
.about-inner, .contact-inner {
  max-width: 760px;
  margin: 0 auto;
  text-align: center;
}
.about-inner p, .contact-inner p {
  color: var(--text-soft);
  font-size: 16px;
  margin-top: 16px;
}
.contact-list {
  list-style: none;
  margin-top: 24px;
  text-align: left;
  display: inline-block;
}
.contact-list li {
  font-size: 15px;
  margin: 8px 0;
}

/* footer */
.footer {
  background: #1f2330;
  color: #b8bdcc;
  padding: 50px 0 30px;
}
.footer-inner {
  display: grid;
  grid-template-columns: 1fr 1fr 1fr;
  gap: 24px;
  align-items: center;
}
.footer-brand {
  display: flex;
  align-items: center;
  gap: 10px;
  color: #fff;
  font-weight: 600;
}
.footer-links {
  display: flex;
  justify-content: center;
  gap: 28px;
}
.footer-links a { color: #b8bdcc; }
.footer-links a:hover { color: #fff; }
.footer-copy {
  text-align: right;
  font-size: 13px;
}
.footer-copy a { color: #b8bdcc; }
.footer-copy a:hover { color: #fff; }

/* responsive */
@media (max-width: 900px) {
  .hero-inner { grid-template-columns: 1fr; text-align: center; }
  .hero-text h1 { font-size: 42px; }
  .hero-sub { margin-left: auto; margin-right: auto; }
  .hero-actions { justify-content: center; }
  .hero-visual { order: -1; }
  .phone { width: 220px; height: 440px; }
  .grid { grid-template-columns: 1fr; }
  .nav-links { display: none; }
  .footer-inner { grid-template-columns: 1fr; text-align: center; }
  .footer-links { justify-content: center; }
  .footer-copy { text-align: center; }
  .section-title { font-size: 28px; }
}