/* ===== ???? - DNF???? ???? ===== */
:root {
  --bg: #0a0c10;
  --bg-2: #0f131a;
  --panel: rgba(20, 24, 32, 0.72);
  --panel-solid: #141822;
  --border: rgba(255, 255, 255, 0.08);
  --border-strong: rgba(255, 140, 0, 0.35);
  --text: #e8ecf3;
  --text-dim: #9aa4b2;
  --text-faint: #6b7482;
  --accent: #ff8c00;
  --accent-2: #ffb347;
  --accent-glow: rgba(255, 140, 0, 0.45);
  --good: #43d17a;
  --radius: 16px;
  --radius-sm: 10px;
  --shadow: 0 20px 60px rgba(0, 0, 0, 0.45);
  --maxw: 1200px;
  --font: "PingFang SC", "Microsoft YaHei", "Hiragino Sans GB", -apple-system,
    BlinkMacSystemFont, "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
}

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

html { scroll-behavior: smooth; scroll-padding-top: 84px; }

body {
  font-family: var(--font);
  background: var(--bg);
  color: var(--text);
  line-height: 1.7;
  overflow-x: hidden;
  -webkit-font-smoothing: antialiased;
}

/* ???? */
#bg-canvas {
  position: fixed;
  inset: 0;
  z-index: -2;
  display: block;
}
.bg-gradient {
  position: fixed;
  inset: 0;
  z-index: -1;
  pointer-events: none;
  background:
    radial-gradient(1200px 600px at 15% -10%, rgba(255, 140, 0, 0.10), transparent 60%),
    radial-gradient(900px 500px at 95% 0%, rgba(90, 120, 255, 0.08), transparent 55%),
    radial-gradient(1000px 700px at 50% 120%, rgba(255, 140, 0, 0.06), transparent 60%),
    linear-gradient(180deg, var(--bg), var(--bg-2));
}

a { color: inherit; text-decoration: none; }
img { max-width: 100%; display: block; }
.container { width: 100%; max-width: var(--maxw); margin: 0 auto; padding: 0 24px; }

/* ===== ??? ===== */
.nav {
  position: fixed;
  top: 0; left: 0; right: 0;
  z-index: 100;
  transition: background .3s, box-shadow .3s, border-color .3s;
  border-bottom: 1px solid transparent;
  backdrop-filter: blur(0px);
}
.nav.scrolled {
  background: rgba(10, 12, 16, 0.78);
  backdrop-filter: blur(14px);
  border-bottom: 1px solid var(--border);
  box-shadow: 0 8px 30px rgba(0, 0, 0, 0.35);
}
.nav-inner {
  display: flex; align-items: center; justify-content: space-between;
  height: 68px;
}
.brand { display: flex; align-items: center; gap: 12px; font-weight: 800; font-size: 20px; letter-spacing: .5px; }
.brand .logo {
  width: 38px; height: 38px; border-radius: 10px;
  display: grid; place-items: center;
  background: linear-gradient(135deg, var(--accent), var(--accent-2));
  color: #1a1200; font-weight: 900; font-size: 18px;
  box-shadow: 0 6px 18px var(--accent-glow);
}
.brand .name { background: linear-gradient(90deg, #fff, #ffd8a8); -webkit-background-clip: text; background-clip: text; color: transparent; }
.brand .tag { font-size: 12px; color: var(--text-faint); font-weight: 500; margin-left: 2px; }

.nav-links { display: flex; align-items: center; gap: 6px; }
.nav-links a {
  padding: 9px 16px; border-radius: 10px; color: var(--text-dim);
  font-size: 15px; font-weight: 600; transition: color .2s, background .2s;
}
.nav-links a:hover, .nav-links a.active { color: #fff; background: rgba(255, 255, 255, 0.06); }
.nav-links a.cta {
  color: #1a1200; background: linear-gradient(135deg, var(--accent), var(--accent-2));
  box-shadow: 0 6px 18px var(--accent-glow);
}
.nav-links a.cta:hover { filter: brightness(1.08); background: linear-gradient(135deg, var(--accent), var(--accent-2)); }

.nav-toggle { display: none; background: none; border: 0; cursor: pointer; padding: 8px; }
.nav-toggle span { display: block; width: 24px; height: 2px; background: var(--text); margin: 5px 0; border-radius: 2px; transition: .3s; }

/* ===== ???? ===== */
section { position: relative; }
.block { padding: 90px 0; }
.section-head { text-align: center; max-width: 720px; margin: 0 auto 54px; }
.eyebrow {
  display: inline-block; font-size: 13px; font-weight: 700; letter-spacing: 2px;
  text-transform: uppercase; color: var(--accent-2);
  padding: 6px 14px; border: 1px solid var(--border-strong); border-radius: 999px;
  background: rgba(255, 140, 0, 0.08); margin-bottom: 18px;
}
.section-title { font-size: clamp(28px, 4vw, 42px); font-weight: 800; line-height: 1.2; letter-spacing: .5px; }
.section-title .hl { background: linear-gradient(90deg, var(--accent), var(--accent-2)); -webkit-background-clip: text; background-clip: text; color: transparent; }
.section-sub { color: var(--text-dim); margin-top: 14px; font-size: 16px; }

/* ===== Hero ===== */
.hero { padding-top: 150px; padding-bottom: 70px; }
.hero-grid { display: grid; grid-template-columns: 1.05fr 1fr; gap: 56px; align-items: center; }
.hero-badge {
  display: inline-flex; align-items: center; gap: 8px; font-size: 13px; font-weight: 600;
  color: var(--accent-2); padding: 7px 14px; border-radius: 999px;
  border: 1px solid var(--border-strong); background: rgba(255, 140, 0, 0.08); margin-bottom: 22px;
}
.hero-badge .dot { width: 8px; height: 8px; border-radius: 50%; background: var(--good); box-shadow: 0 0 10px var(--good); animation: pulse 1.8s infinite; }
@keyframes pulse { 0%,100% { opacity: 1; } 50% { opacity: .35; } }
.hero h1 { font-size: clamp(34px, 5vw, 58px); line-height: 1.12; font-weight: 900; letter-spacing: .5px; }
.hero h1 .hl { background: linear-gradient(90deg, var(--accent), var(--accent-2)); -webkit-background-clip: text; background-clip: text; color: transparent; }
.hero p.lead { color: var(--text-dim); font-size: 18px; margin: 22px 0 32px; max-width: 560px; }
.hero-actions { display: flex; flex-wrap: wrap; gap: 14px; }
.hero-stats { display: flex; gap: 34px; margin-top: 40px; flex-wrap: wrap; }
.hero-stats .stat .num { font-size: 30px; font-weight: 800; background: linear-gradient(90deg, #fff, #ffd8a8); -webkit-background-clip: text; background-clip: text; color: transparent; }
.hero-stats .stat .lbl { font-size: 13px; color: var(--text-faint); }

/* ?? */
.btn { display: inline-flex; align-items: center; gap: 8px; padding: 14px 26px; border-radius: 12px; font-weight: 700; font-size: 16px; cursor: pointer; border: 1px solid transparent; transition: transform .15s, filter .2s, background .2s, border-color .2s; }
.btn:active { transform: translateY(1px); }
.btn-primary { color: #1a1200; background: linear-gradient(135deg, var(--accent), var(--accent-2)); box-shadow: 0 10px 30px var(--accent-glow); }
.btn-primary:hover { filter: brightness(1.08); transform: translateY(-2px); }
.btn-ghost { color: var(--text); background: rgba(255, 255, 255, 0.04); border-color: var(--border); }
.btn-ghost:hover { background: rgba(255, 255, 255, 0.08); border-color: var(--border-strong); transform: translateY(-2px); }
.btn-block { width: 100%; justify-content: center; }

/* ===== ?? ===== */
.carousel {
  position: relative; border-radius: var(--radius); overflow: hidden;
  border: 1px solid var(--border); background: var(--panel); box-shadow: var(--shadow);
  aspect-ratio: 715 / 507;
}
.carousel::before {
  content: ""; position: absolute; inset: 0; z-index: 2; pointer-events: none;
  box-shadow: inset 0 0 0 1px rgba(255, 140, 0, 0.12);
  border-radius: var(--radius);
}
.carousel-track { position: absolute; inset: 0; display: flex; transition: transform .6s cubic-bezier(.65,.05,.36,1); }
.carousel-track img { min-width: 100%; height: 100%; object-fit: cover; }
.carousel-btn {
  position: absolute; top: 50%; transform: translateY(-50%); z-index: 3;
  width: 42px; height: 42px; border-radius: 50%; border: 1px solid var(--border);
  background: rgba(10, 12, 16, 0.6); backdrop-filter: blur(6px); color: #fff;
  font-size: 20px; cursor: pointer; display: grid; place-items: center; transition: .2s;
}
.carousel-btn:hover { background: var(--accent); color: #1a1200; border-color: var(--accent); }
.carousel-btn.prev { left: 14px; }
.carousel-btn.next { right: 14px; }
.carousel-dots { position: absolute; bottom: 14px; left: 0; right: 0; z-index: 3; display: flex; justify-content: center; gap: 8px; }
.carousel-dots button { width: 9px; height: 9px; border-radius: 50%; border: 0; background: rgba(255, 255, 255, 0.35); cursor: pointer; transition: .3s; }
.carousel-dots button.active { width: 26px; border-radius: 6px; background: var(--accent); }

/* ===== ???? ===== */
.features-grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: 22px; }
.feature-card {
  background: var(--panel); border: 1px solid var(--border); border-radius: var(--radius);
  padding: 30px 26px; transition: transform .25s, border-color .25s, box-shadow .25s;
  position: relative; overflow: hidden;
}
.feature-card::after {
  content: ""; position: absolute; top: 0; left: 0; right: 0; height: 3px;
  background: linear-gradient(90deg, var(--accent), transparent);
  transform: scaleX(0); transform-origin: left; transition: transform .3s;
}
.feature-card:hover { transform: translateY(-6px); border-color: var(--border-strong); box-shadow: 0 20px 50px rgba(0,0,0,.4); }
.feature-card:hover::after { transform: scaleX(1); }
.feature-icon {
  width: 52px; height: 52px; border-radius: 14px; display: grid; place-items: center;
  font-size: 24px; margin-bottom: 18px;
  background: linear-gradient(135deg, rgba(255, 140, 0, 0.18), rgba(255, 179, 71, 0.06));
  border: 1px solid var(--border-strong);
}
.feature-card h3 { font-size: 19px; font-weight: 700; margin-bottom: 10px; }
.feature-card p { color: var(--text-dim); font-size: 15px; }

/* ===== ?????? ===== */
.func-list { display: grid; grid-template-columns: repeat(2, 1fr); gap: 14px 40px; max-width: 960px; margin: 0 auto; }
.func-item { display: flex; gap: 14px; align-items: flex-start; padding: 16px 18px; border-radius: var(--radius-sm); background: rgba(255,255,255,.02); border: 1px solid var(--border); transition: .2s; }
.func-item:hover { background: rgba(255,140,0,.05); border-color: var(--border-strong); }
.func-item .no { flex: none; width: 30px; height: 30px; border-radius: 8px; display: grid; place-items: center; font-weight: 800; font-size: 14px; color: var(--accent-2); background: rgba(255,140,0,.12); border: 1px solid var(--border-strong); }
.func-item .txt { font-size: 15px; color: var(--text); }
.func-item .txt b { color: #fff; }

/* ===== ?? ===== */
.pricing-grid { display: grid; grid-template-columns: repeat(5, 1fr); gap: 18px; align-items: stretch; }
.price-card {
  position: relative; background: var(--panel); border: 1px solid var(--border);
  border-radius: var(--radius); padding: 30px 22px; text-align: center; transition: transform .25s, border-color .25s, box-shadow .25s;
  display: flex; flex-direction: column;
}
.price-card:hover { transform: translateY(-6px); border-color: var(--border-strong); box-shadow: 0 20px 50px rgba(0,0,0,.4); }
.price-card.featured { border-color: var(--accent); background: linear-gradient(180deg, rgba(255,140,0,.10), var(--panel)); box-shadow: 0 20px 50px var(--accent-glow); }
.price-card .rec { position: absolute; top: -12px; left: 50%; transform: translateX(-50%); font-size: 12px; font-weight: 800; letter-spacing: 1px; color: #1a1200; background: linear-gradient(135deg, var(--accent), var(--accent-2)); padding: 5px 14px; border-radius: 999px; box-shadow: 0 6px 16px var(--accent-glow); }
.price-card .plan { font-size: 17px; font-weight: 700; color: var(--text-dim); margin-bottom: 14px; }
.price-card .amount { font-size: 40px; font-weight: 900; line-height: 1; }
.price-card .amount .cur { font-size: 18px; font-weight: 700; vertical-align: super; color: var(--accent-2); }
.price-card .amount .rmb { font-size: 14px; color: var(--text-faint); font-weight: 600; }
.price-card .per { font-size: 13px; color: var(--text-faint); margin: 8px 0 20px; }
.price-card ul { list-style: none; text-align: left; margin-bottom: 24px; flex: 1; }
.price-card ul li { font-size: 14px; color: var(--text-dim); padding: 7px 0 7px 24px; position: relative; }
.price-card ul li::before { content: "?"; position: absolute; left: 0; color: var(--good); font-weight: 900; }

/* ===== ???? ===== */
.articles-grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: 22px; }
.article-card {
  background: var(--panel); border: 1px solid var(--border); border-radius: var(--radius);
  padding: 26px; transition: transform .25s, border-color .25s, box-shadow .25s; display: flex; flex-direction: column;
}
.article-card:hover { transform: translateY(-6px); border-color: var(--border-strong); box-shadow: 0 20px 50px rgba(0,0,0,.4); }
.article-card .kw { font-size: 12px; font-weight: 700; color: var(--accent-2); letter-spacing: 1px; margin-bottom: 12px; }
.article-card h3 { font-size: 18px; font-weight: 700; line-height: 1.45; margin-bottom: 12px; }
.article-card p { color: var(--text-dim); font-size: 14px; flex: 1; }
.article-card .more { margin-top: 18px; color: var(--accent-2); font-weight: 700; font-size: 14px; display: inline-flex; align-items: center; gap: 6px; }
.article-card:hover .more { gap: 10px; }

/* ===== QQ? CTA ===== */
.qq-cta {
  background: linear-gradient(135deg, rgba(255,140,0,.12), rgba(20,24,32,.7));
  border: 1px solid var(--border-strong); border-radius: 22px; padding: 56px 48px;
  text-align: center; box-shadow: var(--shadow); position: relative; overflow: hidden;
}
.qq-cta::before { content: ""; position: absolute; width: 380px; height: 380px; border-radius: 50%; background: radial-gradient(circle, var(--accent-glow), transparent 70%); top: -140px; right: -80px; filter: blur(20px); }
.qq-cta h2 { font-size: clamp(26px, 3.5vw, 38px); font-weight: 800; position: relative; }
.qq-cta .qnum { display: inline-flex; align-items: center; gap: 12px; margin: 22px 0; font-size: 22px; font-weight: 800; color: var(--accent-2); }
.qq-cta .qnum .code { font-size: 32px; letter-spacing: 2px; background: linear-gradient(90deg,#fff,#ffd8a8); -webkit-background-clip: text; background-clip: text; color: transparent; }
.qq-cta p { color: var(--text-dim); max-width: 620px; margin: 0 auto 28px; position: relative; }

/* ===== ?? ===== */
.footer { border-top: 1px solid var(--border); padding: 54px 0 34px; margin-top: 30px; background: rgba(10,12,16,.5); }
.footer-grid { display: grid; grid-template-columns: 1.4fr 1fr 1fr 1fr; gap: 40px; margin-bottom: 40px; }
.footer h4 { font-size: 15px; margin-bottom: 16px; color: #fff; }
.footer ul { list-style: none; }
.footer ul li { margin-bottom: 10px; }
.footer ul li a { color: var(--text-dim); font-size: 14px; transition: color .2s; }
.footer ul li a:hover { color: var(--accent-2); }
.footer .about p { color: var(--text-dim); font-size: 14px; max-width: 320px; margin-top: 14px; }
.footer-bottom { border-top: 1px solid var(--border); padding-top: 22px; text-align: center; color: var(--text-faint); font-size: 13px; }
.footer-bottom .kw-line { margin-top: 10px; color: #556; font-size: 12px; }

/* ===== ????? ===== */
.article-hero { padding-top: 130px; padding-bottom: 30px; }
.breadcrumb { font-size: 14px; color: var(--text-faint); margin-bottom: 20px; }
.breadcrumb a:hover { color: var(--accent-2); }
.article-body { max-width: 820px; margin: 0 auto; padding-bottom: 80px; }
.article-body .meta { color: var(--text-faint); font-size: 14px; margin-bottom: 8px; }
.article-body h1 { font-size: clamp(26px, 4vw, 40px); font-weight: 800; line-height: 1.25; margin-bottom: 24px; }
.article-body h2 { font-size: 24px; font-weight: 800; margin: 40px 0 16px; padding-left: 14px; border-left: 4px solid var(--accent); }
.article-body h3 { font-size: 19px; font-weight: 700; margin: 28px 0 12px; color: var(--accent-2); }
.article-body p { color: var(--text-dim); margin-bottom: 16px; font-size: 16px; }
.article-body ul, .article-body ol { color: var(--text-dim); margin: 0 0 18px 22px; }
.article-body li { margin-bottom: 8px; }
.article-body strong { color: #fff; }
.article-body .lead-box { background: var(--panel); border: 1px solid var(--border-strong); border-radius: var(--radius); padding: 22px 24px; margin-bottom: 30px; color: var(--text); }
.article-body .tip { background: rgba(255,140,0,.06); border-left: 4px solid var(--accent); border-radius: 0 10px 10px 0; padding: 16px 20px; margin: 20px 0; color: var(--text); }
.article-cta { display: flex; flex-wrap: wrap; gap: 14px; margin: 40px 0 10px; }
.related { margin-top: 50px; border-top: 1px solid var(--border); padding-top: 30px; }
.related h3 { font-size: 18px; margin-bottom: 18px; }

/* reveal ?? */
.reveal { opacity: 0; transform: translateY(28px); transition: opacity .7s ease, transform .7s ease; }
.reveal.in { opacity: 1; transform: none; }

/* ===== ??? ===== */
@media (max-width: 960px) {
  .hero-grid { grid-template-columns: 1fr; gap: 40px; }
  .features-grid, .articles-grid { grid-template-columns: repeat(2, 1fr); }
  .pricing-grid { grid-template-columns: repeat(2, 1fr); }
  .footer-grid { grid-template-columns: 1fr 1fr; gap: 30px; }
}
@media (max-width: 760px) {
  .nav-links {
    position: fixed; top: 68px; left: 0; right: 0; flex-direction: column; align-items: stretch;
    gap: 4px; padding: 16px 24px 24px; background: rgba(10,12,16,.96); backdrop-filter: blur(14px);
    border-bottom: 1px solid var(--border); transform: translateY(-140%); transition: transform .35s; box-shadow: var(--shadow);
  }
  .nav-links.open { transform: translateY(0); }
  .nav-links a { padding: 14px 16px; }
  .nav-toggle { display: block; }
  .nav-toggle.active span:nth-child(1) { transform: translateY(7px) rotate(45deg); }
  .nav-toggle.active span:nth-child(2) { opacity: 0; }
  .nav-toggle.active span:nth-child(3) { transform: translateY(-7px) rotate(-45deg); }
  .block { padding: 64px 0; }
  .func-list { grid-template-columns: 1fr; }
  .hero-stats { gap: 24px; }
}
@media (max-width: 560px) {
  .features-grid, .articles-grid, .pricing-grid, .footer-grid { grid-template-columns: 1fr; }
  .container { padding: 0 18px; }
  .qq-cta { padding: 40px 24px; }
  .hero-actions .btn { flex: 1; justify-content: center; }
}