:root {
  --df-bg: #fff8ee;
  --df-primary: #ca5612;
  --df-primary-dark: #a84509;
  --df-primary-light: #fff0e3;
  --df-text: #35251b;
  --df-text-sub: #806d60;
  --df-card: #ffffff;
  --df-border: #f0dfcf;
  --df-shadow-warm: 0 6px 24px rgba(202, 86, 18, 0.10);
  --df-shadow-warm-sm: 0 3px 12px rgba(202, 86, 18, 0.08);
  --df-radius-card: 18px;
  --df-radius-btn: 12px;
  --df-header-h: 64px;
}

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

html { scroll-behavior: smooth; }

body {
  font-family:
    "Helvetica Neue",
    Helvetica,
    "PingFang SC",
    Tahoma,
    "Hiragino Sans GB",
    "Heiti SC",
    Arial,
    "Microsoft YaHei",
    "WenQuanYi Micro Hei",
    sans-serif;
  background-color: var(--df-bg);
  color: var(--df-text);
  line-height: 1.7;
  font-size: 16px;
  -webkit-font-smoothing: antialiased;
}

img { max-width: 100%; height: auto; display: block; }
a { text-decoration: none; color: inherit; }
ul, ol { list-style: none; }

.df-container {
  max-width: 1200px;
  margin: 0 auto;
  padding: 0 24px;
}
.df-container-narrow { max-width: 860px; }

.df-btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  border-radius: var(--df-radius-btn);
  font-weight: 600;
  cursor: pointer;
  transition: transform 0.15s ease, box-shadow 0.15s ease, background-color 0.15s ease;
  white-space: nowrap;
}
.df-btn i { font-size: 1.15em; }
.df-btn-primary {
  background: linear-gradient(180deg, #d7611c 0%, var(--df-primary) 60%, #b64e0e 100%);
  color: #fff;
  padding: 14px 32px;
  font-size: 16px;
  border: none;
  box-shadow: 0 4px 0 #9c420b, var(--df-shadow-warm);
}
.df-btn-primary:hover {
  transform: translateY(-2px);
  box-shadow: 0 6px 0 #9c420b, 0 10px 24px rgba(202, 86, 18, 0.22);
}
.df-btn-primary:active { transform: translateY(1px); box-shadow: 0 2px 0 #9c420b, var(--df-shadow-warm-sm); }
.df-btn-ghost {
  background: #fff;
  color: var(--df-primary);
  padding: 14px 32px;
  font-size: 16px;
  border: 1.5px solid var(--df-border);
  box-shadow: var(--df-shadow-warm-sm);
}
.df-btn-ghost:hover { border-color: var(--df-primary); transform: translateY(-2px); }
.df-btn-white {
  background: #fff;
  color: var(--df-primary);
  padding: 15px 36px;
  font-size: 17px;
  border: none;
  box-shadow: 0 4px 0 rgba(0, 0, 0, 0.12), 0 8px 24px rgba(0, 0, 0, 0.16);
}
.df-btn-white:hover { transform: translateY(-2px); }
.df-btn-sm { padding: 9px 18px; font-size: 14px; }
.df-btn-lg { padding: 15px 34px; font-size: 17px; }
.df-btn-block { width: 100%; padding: 13px 0; }

.df-site-header {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  height: var(--df-header-h);
  background: rgba(255, 248, 238, 0.92);
  backdrop-filter: blur(8px);
  border-bottom: 1px solid var(--df-border);
  z-index: 100;
}
.df-header-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: var(--df-header-h);
  gap: 16px;
}
.df-brand { display: flex; align-items: center; gap: 10px; }
.df-brand-logo { width: 36px; height: 36px; border-radius: 8px; }
.df-brand-name { font-size: 20px; font-weight: 800; color: var(--df-text); letter-spacing: -0.3px; }
.df-nav-links { display: flex; gap: 28px; }
.df-nav-links a {
  font-size: 15px;
  color: var(--df-text-sub);
  font-weight: 500;
  transition: color 0.15s ease;
}
.df-nav-links a:hover, .df-nav-links a.df-active { color: var(--df-primary); }
.df-header-actions { display: flex; align-items: center; gap: 12px; }
.df-nav-toggle {
  display: none;
  background: none;
  border: 1.5px solid var(--df-border);
  border-radius: 10px;
  width: 40px;
  height: 40px;
  font-size: 20px;
  color: var(--df-text);
  cursor: pointer;
  align-items: center;
  justify-content: center;
}

.df-hero { padding: calc(var(--df-header-h) + 56px) 0 72px; }
.df-hero-inner {
  display: grid;
  grid-template-columns: 1.1fr 0.9fr;
  gap: 48px;
  align-items: center;
}
.df-hero-eyebrow {
  font-size: 13px;
  font-weight: 700;
  letter-spacing: 3px;
  color: var(--df-primary);
  margin-bottom: 14px;
}
.df-hero h1 {
  font-size: 44px;
  line-height: 1.25;
  font-weight: 800;
  letter-spacing: -0.5px;
  margin-bottom: 14px;
}
.df-hero-subtitle { font-size: 20px; font-weight: 600; color: var(--df-primary); margin-bottom: 16px; }
.df-hero-desc { color: var(--df-text-sub); margin-bottom: 22px; max-width: 520px; }
.df-hero-tags {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
  margin-bottom: 30px;
}
.df-hero-tags li {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  background: var(--df-primary-light);
  color: var(--df-primary);
  font-size: 14px;
  font-weight: 600;
  padding: 7px 14px;
  border-radius: 999px;
  border: 1px solid var(--df-border);
}
.df-hero-actions { display: flex; gap: 14px; flex-wrap: wrap; }

.df-hero-visual {
  position: relative;
  display: flex;
  justify-content: center;
  gap: 20px;
  padding: 20px 0;
}
.df-phone-frame {
  background: #fff;
  border: 1px solid var(--df-border);
  border-radius: 22px;
  padding: 8px;
  box-shadow: var(--df-shadow-warm);
  overflow: hidden;
  flex-shrink: 0;
}
.df-phone-frame img { border-radius: 16px; width: 240px; }
.df-tilt-l { transform: rotate(-2.5deg) translateY(8px); }
.df-tilt-r { transform: rotate(2.5deg) translateY(-6px); }

.df-section { padding: 88px 0; }
.df-section-alt { background: var(--df-primary-light); }
.df-section-head { text-align: center; margin-bottom: 48px; }
.df-section-num {
  display: inline-block;
  font-size: 13px;
  font-weight: 800;
  letter-spacing: 2px;
  color: var(--df-primary);
  background: #fff;
  border: 1px solid var(--df-border);
  border-radius: 999px;
  padding: 4px 14px;
  margin-bottom: 14px;
}
.df-section-alt .df-section-num { background: var(--df-primary-light); }
.df-section-head h2 { font-size: 32px; font-weight: 800; letter-spacing: -0.4px; margin-bottom: 10px; }
.df-section-sub { color: var(--df-text-sub); font-size: 17px; }

.df-intro-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 20px;
  margin-bottom: 32px;
}
.df-intro-card {
  background: var(--df-card);
  border: 1px solid var(--df-border);
  border-radius: var(--df-radius-card);
  padding: 30px 26px;
  box-shadow: var(--df-shadow-warm-sm);
}
.df-intro-card h3 {
  display: flex;
  align-items: center;
  gap: 10px;
  font-size: 19px;
  font-weight: 700;
  color: var(--df-primary);
  margin-bottom: 12px;
}
.df-intro-card h3 i { font-size: 24px; }
.df-intro-card p { color: var(--df-text-sub); font-size: 15px; }

.df-notice-bar {
  display: flex;
  align-items: flex-start;
  gap: 12px;
  background: linear-gradient(180deg, #fff4e6 0%, #ffedd9 100%);
  border: 1.5px solid #f5cfa8;
  border-radius: 14px;
  padding: 18px 22px;
  color: var(--df-text);
  font-size: 15px;
}
.df-notice-bar i { color: var(--df-primary); font-size: 22px; line-height: 1.4; }
.df-notice-bar strong { color: var(--df-primary); margin-right: 8px; }
.df-notice-bar-plain { background: var(--df-bg); }

.df-disclaimer {
  background: #fff;
  border: 1px solid var(--df-border);
  border-left: 4px solid var(--df-primary);
  border-radius: 12px;
  padding: 20px 24px;
  margin-top: 24px;
}
.df-disclaimer h3 {
  display: flex;
  align-items: center;
  gap: 8px;
  font-size: 16px;
  font-weight: 700;
  color: var(--df-primary);
  margin-bottom: 10px;
}
.df-disclaimer h3 i { font-size: 20px; }
.df-disclaimer p { color: var(--df-text-sub); font-size: 14px; line-height: 1.8; }
.df-disclaimer p + p { margin-top: 8px; }

.df-feature-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 20px;
}
.df-feature-card {
  background: var(--df-card);
  border: 1px solid var(--df-border);
  border-radius: var(--df-radius-card);
  padding: 28px 24px;
  box-shadow: var(--df-shadow-warm-sm);
  transition: transform 0.18s ease, box-shadow 0.18s ease;
}
.df-feature-card:hover { transform: translateY(-4px); box-shadow: var(--df-shadow-warm); }
.df-feature-icon {
  width: 52px;
  height: 52px;
  border-radius: 14px;
  background: var(--df-primary-light);
  color: var(--df-primary);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 26px;
  margin-bottom: 16px;
  box-shadow: inset 0 1px 0 #fff, var(--df-shadow-warm-sm);
}
.df-feature-card h3 { font-size: 18px; font-weight: 700; margin-bottom: 8px; }
.df-feature-card p { color: var(--df-text-sub); font-size: 14.5px; }

.df-screen-strip {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 22px;
}
.df-screen-item { text-align: center; }
.df-screen-item .df-phone-frame { margin: 0 auto 16px; transition: transform 0.18s ease, box-shadow 0.18s ease; }
.df-screen-item:hover .df-phone-frame { transform: translateY(-4px); box-shadow: 0 12px 30px rgba(202, 86, 18, 0.16); }
.df-screen-item img { width: 100%; }
.df-screen-item h3 { font-size: 17px; font-weight: 700; margin-bottom: 6px; }
.df-screen-item figcaption p { color: var(--df-text-sub); font-size: 13.5px; }

.df-tutorial-list { counter-reset: dfstep; }
.df-tutorial-step {
  display: grid;
  grid-template-columns: 1fr auto;
  gap: 28px;
  align-items: center;
  background: var(--df-card);
  border: 1px solid var(--df-border);
  border-radius: var(--df-radius-card);
  padding: 30px 32px;
  margin-bottom: 20px;
  box-shadow: var(--df-shadow-warm-sm);
}
.df-tutorial-step h3 { font-size: 19px; font-weight: 700; margin-bottom: 10px; display: flex; align-items: center; gap: 12px; flex-wrap: wrap; }
.df-step-badge {
  display: inline-block;
  background: var(--df-primary-light);
  color: var(--df-primary);
  font-size: 13px;
  font-weight: 700;
  padding: 3px 12px;
  border-radius: 999px;
  border: 1px solid var(--df-border);
  flex-shrink: 0;
}
.df-tutorial-step p, .df-step-detail { color: var(--df-text-sub); font-size: 15px; }
.df-step-detail { padding-left: 0; }
.df-step-detail li { position: relative; padding-left: 18px; margin-bottom: 6px; }
.df-step-detail li::before {
  content: "";
  position: absolute;
  left: 2px;
  top: 10px;
  width: 6px;
  height: 6px;
  border-radius: 50%;
  background: var(--df-primary);
}
.df-tutorial-step code {
  background: var(--df-primary-light);
  color: var(--df-primary-dark);
  border-radius: 6px;
  padding: 1px 7px;
  font-size: 13.5px;
}
.df-step-figure { flex-shrink: 0; }
.df-step-figure img {
  width: 150px;
  box-shadow: var(--df-shadow-warm-sm);
  border: 1px solid var(--df-border);
  border-radius: 14px;
}
.df-tutorial-step .df-btn { margin-top: 14px; }

.df-compat-panel {
  background: linear-gradient(180deg, #fff4e6 0%, #ffedd9 100%);
  border: 1.5px solid #f5cfa8;
  border-radius: 22px;
  padding: 48px 44px;
}
.df-compat-panel .df-section-head { margin-bottom: 32px; }
.df-compat-icon { font-size: 40px; color: var(--df-primary); margin-bottom: 8px; display: inline-block; }
.df-compat-panel h2 { font-size: 26px; font-weight: 800; margin-bottom: 6px; }
.df-compat-list {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 14px 24px;
  margin-bottom: 24px;
}
.df-compat-list li {
  display: flex;
  align-items: flex-start;
  gap: 10px;
  background: #fff;
  border: 1px solid var(--df-border);
  border-radius: 12px;
  padding: 14px 16px;
  font-size: 15px;
  color: var(--df-text);
}
.df-compat-list li i { color: var(--df-primary); font-size: 19px; margin-top: 3px; flex-shrink: 0; }

.df-faq-list { display: flex; flex-direction: column; gap: 14px; }
.df-faq-item {
  background: var(--df-card);
  border: 1px solid var(--df-border);
  border-radius: 14px;
  padding: 0 24px;
  box-shadow: var(--df-shadow-warm-sm);
  overflow: hidden;
}
.df-faq-item summary {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 12px;
  font-size: 16.5px;
  font-weight: 600;
  padding: 20px 0;
  cursor: pointer;
  list-style: none;
}
.df-faq-item summary::-webkit-details-marker { display: none; }
.df-faq-arrow { color: var(--df-primary); font-size: 24px; transition: transform 0.2s ease; flex-shrink: 0; }
.df-faq-item[open] .df-faq-arrow { transform: rotate(180deg); }
.df-faq-body { padding: 0 0 20px; color: var(--df-text-sub); font-size: 15px; }

.df-cta-band {
  background: linear-gradient(160deg, #d8621a 0%, var(--df-primary) 45%, #a84509 100%);
  padding: 80px 0;
  text-align: center;
  color: #fff;
}
.df-cta-inner h2 { font-size: 34px; font-weight: 800; margin-bottom: 14px; letter-spacing: -0.4px; }
.df-cta-inner > p { font-size: 16.5px; color: rgba(255, 244, 235, 0.92); max-width: 560px; margin: 0 auto 30px; }

.df-site-footer {
  background: #2b1a10;
  color: #cbb5a4;
  padding: 56px 0 90px;
}
.df-footer-inner { display: flex; flex-direction: column; gap: 28px; }
.df-footer-brand { display: flex; align-items: flex-start; gap: 14px; }
.df-footer-brand img { width: 40px; height: 40px; border-radius: 9px; }
.df-footer-name { color: #fff; font-weight: 700; font-size: 17px; }
.df-footer-desc { font-size: 14px; margin-top: 4px; }
.df-footer-nav { display: flex; flex-wrap: wrap; gap: 8px 24px; }
.df-footer-nav a { font-size: 14px; color: #cbb5a4; transition: color 0.15s; }
.df-footer-nav a:hover { color: #ff9a5c; }
.df-footer-risk p {
  background: rgba(255, 154, 92, 0.08);
  border: 1px solid rgba(255, 154, 92, 0.25);
  border-radius: 10px;
  padding: 14px 18px;
  font-size: 13.5px;
  line-height: 1.8;
}
.df-footer-risk i { color: #ff9a5c; margin-right: 6px; }
.df-footer-copy { font-size: 12.5px; color: #947d6c; line-height: 1.8; border-top: 1px solid rgba(203, 181, 164, 0.18); padding-top: 22px; }

@media (max-width: 1024px) {
  .df-hero-inner { grid-template-columns: 1fr 0.85fr; gap: 32px; }
  .df-phone-frame img { width: 200px; }
  .df-screen-strip { grid-template-columns: repeat(2, 1fr); }
}

@media (max-width: 768px) {
  .df-nav-toggle { display: inline-flex; }
  .df-nav-links {
    position: absolute;
    top: var(--df-header-h);
    left: 0;
    right: 0;
    background: #fff;
    border-bottom: 1px solid var(--df-border);
    flex-direction: column;
    gap: 0;
    padding: 8px 24px 16px;
    box-shadow: var(--df-shadow-warm);
    display: none;
  }
  .df-nav-links.df-open { display: flex; }
  .df-nav-links a { padding: 12px 0; font-size: 15.5px; border-bottom: 1px solid var(--df-border); }
  .df-nav-links a:last-child { border-bottom: none; }

  .df-hero { padding: calc(var(--df-header-h) + 32px) 0 48px; }
  .df-hero-inner { grid-template-columns: 1fr; gap: 36px; }
  .df-hero h1 { font-size: 32px; }
  .df-hero-subtitle { font-size: 18px; }
  .df-hero-actions .df-btn { flex: 1 1 0; }
  .df-hero-visual { gap: 14px; }
  .df-phone-frame img { width: 168px; }

  .df-section { padding: 56px 0; }
  .df-section-head h2 { font-size: 25px; }
  .df-section-head { margin-bottom: 34px; }

  .df-intro-grid { grid-template-columns: repeat(2, 1fr); gap: 14px; }
  .df-intro-card { padding: 22px 18px; }

  .df-feature-grid { grid-template-columns: repeat(2, 1fr); gap: 14px; }
  .df-feature-card { padding: 22px 18px; }

  .df-screen-strip { grid-template-columns: repeat(2, 1fr); gap: 16px; }
  .df-screen-item .df-phone-frame { border-radius: 16px; padding: 6px; }
  .df-screen-item img { border-radius: 11px; }

  .df-tutorial-step { grid-template-columns: 1fr; padding: 24px 20px; }
  .df-step-figure { order: -1; }
  .df-step-figure img { width: 132px; }

  .df-compat-panel { padding: 32px 22px; }
  .df-compat-list { grid-template-columns: 1fr; }
  .df-compat-panel h2 { font-size: 21px; }

  .df-cta-band { padding: 56px 0; }
  .df-cta-inner h2 { font-size: 26px; }

  .df-site-footer { padding-bottom: 40px; }
}

@media (max-width: 380px) {
  .df-phone-frame img { width: 148px; }
  .df-hero-tags li { font-size: 13px; padding: 6px 11px; }
}

@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
  *, *::before, *::after { transition: none !important; animation: none !important; }
}