/* roulang page: index */
:root{
  --bg:#071018;
  --bg-soft:#0c1622;
  --panel:rgba(12,20,30,.84);
  --panel-strong:rgba(16,26,39,.95);
  --text:#f4f7fb;
  --muted:#9fb0c1;
  --line:rgba(255,255,255,.10);
  --line-strong:rgba(255,255,255,.16);
  --accent:#41e0be;
  --warm:#ff9b4d;
  --shadow:0 24px 60px rgba(0,0,0,.34);
  --shadow-soft:0 12px 34px rgba(0,0,0,.26);
  --radius:24px;
  --radius-sm:18px;
  --container:1180px;
}
*{box-sizing:border-box}
html{scroll-behavior:smooth}
body{
  margin:0;
  font-family:PingFang SC, Microsoft YaHei, system-ui, -apple-system, BlinkMacSystemFont, sans-serif;
  color:var(--text);
  background:
    radial-gradient(900px 500px at 12% 4%, rgba(65,224,190,.13), transparent 60%),
    radial-gradient(700px 520px at 88% 18%, rgba(255,155,77,.11), transparent 58%),
    linear-gradient(180deg, #06101a 0%, #071018 40%, #050b12 100%);
  overflow-x:hidden;
}
body::before{
  content:"";
  position:fixed;
  inset:0;
  pointer-events:none;
  background:
    linear-gradient(transparent 0, transparent 96%, rgba(255,255,255,.03) 100%),
    radial-gradient(circle at 20% 20%, rgba(255,255,255,.03), transparent 22%),
    radial-gradient(circle at 80% 12%, rgba(255,255,255,.03), transparent 18%);
  opacity:.65;
}
a{
  color:inherit;
  text-decoration:none;
  transition:color .2s ease, transform .2s ease, border-color .2s ease, background-color .2s ease, box-shadow .2s ease, opacity .2s ease;
}
a:hover{color:#ffffff}
img{max-width:100%; display:block}
button,input,textarea,select{font:inherit}
::selection{background:rgba(65,224,190,.26); color:#fff}
::-webkit-scrollbar{width:10px; height:10px}
::-webkit-scrollbar-track{background:#061018}
::-webkit-scrollbar-thumb{
  background:linear-gradient(180deg, rgba(65,224,190,.56), rgba(255,155,77,.42));
  border-radius:999px;
  border:2px solid #061018;
}
.shell{
  width:min(var(--container), calc(100% - 1.5rem));
  margin-inline:auto;
}
.panel{
  background:linear-gradient(180deg, rgba(255,255,255,.06), rgba(255,255,255,.03));
  border:1px solid var(--line);
  border-radius:var(--radius);
  box-shadow:var(--shadow);
  backdrop-filter:blur(16px);
}
.panel-soft{
  background:linear-gradient(180deg, rgba(255,255,255,.045), rgba(255,255,255,.02));
  border:1px solid var(--line);
  border-radius:var(--radius);
  box-shadow:var(--shadow-soft);
  backdrop-filter:blur(12px);
}
.ui-btn{
  display:inline-flex;
  align-items:center;
  justify-content:center;
  gap:.55rem;
  padding:.82rem 1.15rem;
  border-radius:999px;
  font-weight:700;
  line-height:1;
  border:1px solid transparent;
  transition:transform .18s ease, box-shadow .18s ease, background-color .18s ease, border-color .18s ease, color .18s ease, opacity .18s ease;
  will-change:transform;
}
.ui-btn:hover{transform:translateY(-1px)}
.ui-btn:active{transform:translateY(0) scale(.99)}
.ui-btn:focus-visible,
.nav-pill:focus-visible,
.ui-input:focus-visible,
.footer-link:focus-visible,
summary:focus-visible{
  outline:2px solid rgba(65,224,190,.75);
  outline-offset:2px;
}
.ui-btn-primary{
  color:#041017;
  background:linear-gradient(135deg, rgba(65,224,190,1), rgba(118,238,219,1));
  box-shadow:0 14px 30px rgba(65,224,190,.18);
}
.ui-btn-primary:hover{box-shadow:0 18px 34px rgba(65,224,190,.24)}
.ui-btn-secondary{
  color:#eaf2fb;
  background:rgba(255,255,255,.03);
  border-color:rgba(255,255,255,.14);
}
.ui-btn-secondary:hover{
  background:rgba(255,255,255,.06);
  border-color:rgba(255,255,255,.22);
}
.ui-btn-ghost{
  color:#dfe9f4;
  background:transparent;
  border-color:transparent;
}
.ui-btn-ghost:hover{
  background:rgba(255,255,255,.05);
  border-color:rgba(255,255,255,.1);
}
.nav-pill{
  display:inline-flex;
  align-items:center;
  justify-content:center;
  gap:.45rem;
  min-height:44px;
  padding:.72rem 1rem;
  border-radius:999px;
  border:1px solid rgba(255,255,255,.12);
  background:rgba(255,255,255,.03);
  color:#dfeaf6;
  font-weight:700;
  font-size:.95rem;
}
.nav-pill:hover,
.nav-pill.active{
  background:linear-gradient(135deg, rgba(65,224,190,.14), rgba(255,155,77,.12));
  border-color:rgba(65,224,190,.34);
  color:#fff;
}
.section-kicker{
  display:inline-flex;
  align-items:center;
  gap:.55rem;
  padding:.38rem .82rem;
  border-radius:999px;
  border:1px solid rgba(65,224,190,.22);
  background:rgba(65,224,190,.08);
  color:var(--accent);
  font-size:.8rem;
  font-weight:800;
  letter-spacing:.08em;
}
.section-title{
  margin:.95rem 0 0;
  font-size:clamp(1.65rem, 3.2vw, 2.45rem);
  line-height:1.12;
  font-weight:800;
  letter-spacing:-.02em;
}
.section-copy{
  margin-top:.9rem;
  max-width:62ch;
  color:var(--muted);
  line-height:1.85;
  font-size:1rem;
}
.ui-input{
  width:100%;
  min-height:48px;
  padding:.85rem 1rem;
  border-radius:999px;
  border:1px solid rgba(255,255,255,.12);
  background:rgba(5,10,16,.82);
  color:#fff;
  box-shadow:inset 0 1px 0 rgba(255,255,255,.03);
}
.ui-input::placeholder{color:#8193a7}
.ui-input:focus{
  border-color:rgba(65,224,190,.42);
  box-shadow:0 0 0 3px rgba(65,224,190,.10);
}
.stat-chip{
  display:inline-flex;
  align-items:center;
  gap:.4rem;
  padding:.52rem .85rem;
  border-radius:999px;
  border:1px solid rgba(255,255,255,.12);
  background:rgba(255,255,255,.04);
  color:#dbe5ef;
  font-size:.82rem;
}
.feature-card,
.story-card,
.price-card,
.update-card,
.faq-item,
.cta-card{
  position:relative;
  overflow:hidden;
}
.feature-card:hover,
.story-card:hover,
.price-card:hover,
.update-card:hover{
  transform:translateY(-3px);
  border-color:rgba(65,224,190,.24);
}
.feature-card,
.story-card,
.price-card,
.update-card{
  transition:transform .2s ease, box-shadow .2s ease, border-color .2s ease, background-color .2s ease;
}
.feature-card:hover,
.story-card:hover,
.price-card:hover,
.update-card:hover{
  box-shadow:0 18px 48px rgba(0,0,0,.34);
}
.feature-mark{
  display:inline-flex;
  width:2.6rem;
  height:2.6rem;
  align-items:center;
  justify-content:center;
  border-radius:1rem;
  background:linear-gradient(135deg, rgba(65,224,190,.15), rgba(255,155,77,.12));
  border:1px solid rgba(255,255,255,.12);
  color:var(--accent);
  font-weight:900;
}
.badge{
  display:inline-flex;
  align-items:center;
  gap:.35rem;
  padding:.35rem .7rem;
  border-radius:999px;
  font-size:.78rem;
  font-weight:800;
  border:1px solid rgba(255,255,255,.12);
  background:rgba(255,255,255,.04);
  color:#dfeaf6;
}
.badge-accent{
  background:rgba(65,224,190,.12);
  color:var(--accent);
  border-color:rgba(65,224,190,.25);
}
.badge-warm{
  background:rgba(255,155,77,.12);
  color:var(--warm);
  border-color:rgba(255,155,77,.24);
}
.price-card.recommended{
  border-color:rgba(65,224,190,.38);
  background:linear-gradient(180deg, rgba(65,224,190,.08), rgba(255,255,255,.03));
}
.price-card .price{
  font-size:clamp(2rem, 4vw, 3rem);
  line-height:1;
  font-weight:900;
  letter-spacing:-.04em;
}
details.faq-item{
  border-radius:1.4rem;
  border:1px solid rgba(255,255,255,.10);
  background:rgba(255,255,255,.04);
  box-shadow:var(--shadow-soft);
}
details.faq-item summary{
  list-style:none;
  cursor:pointer;
}
details.faq-item summary::-webkit-details-marker{display:none}
details.faq-item summary::after{
  content:"+";
  width:1.7rem;
  height:1.7rem;
  display:inline-flex;
  align-items:center;
  justify-content:center;
  border-radius:999px;
  border:1px solid rgba(255,255,255,.12);
  background:rgba(255,255,255,.04);
  color:#fff;
  font-weight:700;
  flex:0 0 auto;
  transition:transform .18s ease, background-color .18s ease;
}
details.faq-item[open] summary::after{
  transform:rotate(45deg);
  background:rgba(65,224,190,.12);
}
.footer-link{
  color:#d4deea;
}
.footer-link:hover{
  color:var(--accent);
}
.soft-divider{
  height:1px;
  background:linear-gradient(90deg, transparent, rgba(255,255,255,.12), transparent);
}
@media (max-width: 1024px){
  .shell{width:min(var(--container), calc(100% - 1.25rem))}
}
@media (max-width: 768px){
  .section-title{font-size:clamp(1.45rem, 6vw, 2rem)}
  .section-copy{font-size:.97rem; line-height:1.8}
  .panel,.panel-soft{border-radius:1.4rem}
  .ui-btn{width:100%}
}

/* roulang page: article */
:root{
  --bg:#071018;
  --bg-soft:#0c1622;
  --panel:rgba(12,20,30,.84);
  --panel-strong:rgba(16,26,39,.95);
  --text:#f4f7fb;
  --muted:#9fb0c1;
  --line:rgba(255,255,255,.10);
  --line-strong:rgba(255,255,255,.16);
  --accent:#41e0be;
  --warm:#ff9b4d;
  --shadow:0 24px 60px rgba(0,0,0,.34);
  --shadow-soft:0 12px 34px rgba(0,0,0,.26);
  --radius:24px;
  --radius-sm:18px;
  --container:1180px;
}
html{scroll-behavior:smooth}
*,
*::before,
*::after{box-sizing:border-box}
body{
  margin:0;
  font-family:PingFang SC, Microsoft YaHei, system-ui, -apple-system, BlinkMacSystemFont, sans-serif;
  color:var(--text);
  background:
    radial-gradient(900px 500px at 12% 4%, rgba(65,224,190,.13), transparent 60%),
    radial-gradient(700px 520px at 88% 18%, rgba(255,155,77,.11), transparent 58%),
    linear-gradient(180deg, #06101a 0%, #071018 40%, #050b12 100%);
  overflow-x:hidden;
}
body::before{
  content:"";
  position:fixed;
  inset:0;
  pointer-events:none;
  background:
    linear-gradient(transparent 0, transparent 96%, rgba(255,255,255,.03) 100%),
    radial-gradient(circle at 20% 20%, rgba(255,255,255,.03), transparent 22%),
    radial-gradient(circle at 80% 12%, rgba(255,255,255,.03), transparent 18%);
  opacity:.65;
}
::selection{
  background:rgba(65,224,190,.24);
  color:#fff;
}
a{
  color:inherit;
  text-decoration:none;
  transition:color .2s ease, transform .2s ease, border-color .2s ease, background-color .2s ease, box-shadow .2s ease, opacity .2s ease;
}
a:hover{color:#ffffff}
img,svg,video{max-width:100%; height:auto}
button,input,textarea,select{font:inherit}
button{cursor:pointer}
.shell{
  max-width:var(--container);
  margin:0 auto;
  padding-inline:1rem;
}
@media (min-width:640px){
  .shell{padding-inline:1.5rem}
}
.panel,
.panel-strong,
.empty-state,
.faq-item,
.cta-card{
  position:relative;
  overflow:hidden;
  border:1px solid var(--line);
  background:var(--panel);
  box-shadow:var(--shadow-soft);
  backdrop-filter:blur(18px);
}
.panel-strong{
  background:var(--panel-strong);
  border-color:var(--line-strong);
  box-shadow:var(--shadow);
}
.panel::after,
.panel-strong::after,
.empty-state::after,
.cta-card::after{
  content:"";
  position:absolute;
  inset:0;
  pointer-events:none;
  background:linear-gradient(135deg, rgba(255,255,255,.04), transparent 28%, transparent 72%, rgba(255,255,255,.03));
}
.ui-btn{
  display:inline-flex;
  align-items:center;
  justify-content:center;
  gap:.55rem;
  min-height:48px;
  padding:.82rem 1.15rem;
  border-radius:999px;
  font-weight:700;
  line-height:1;
  border:1px solid transparent;
  transition:transform .18s ease, box-shadow .18s ease, background-color .18s ease, border-color .18s ease, color .18s ease, opacity .18s ease;
  will-change:transform;
}
.ui-btn:hover{transform:translateY(-1px)}
.ui-btn:active{transform:translateY(0) scale(.99)}
.ui-btn:focus-visible,
.nav-pill:focus-visible,
.ui-input:focus-visible,
.footer-link:focus-visible,
summary:focus-visible{
  outline:2px solid rgba(65,224,190,.75);
  outline-offset:2px;
}
.ui-btn-primary{
  color:#041017;
  background:linear-gradient(135deg, rgba(65,224,190,1), rgba(118,238,219,1));
  box-shadow:0 14px 30px rgba(65,224,190,.18);
}
.ui-btn-primary:hover{box-shadow:0 18px 34px rgba(65,224,190,.24)}
.ui-btn-secondary{
  color:#eaf2fb;
  background:rgba(255,255,255,.03);
  border-color:rgba(255,255,255,.14);
}
.ui-btn-secondary:hover{
  background:rgba(255,255,255,.06);
  border-color:rgba(255,255,255,.22);
}
.ui-btn-ghost{
  color:#dfe9f4;
  background:transparent;
  border-color:transparent;
}
.ui-btn-ghost:hover{
  background:rgba(255,255,255,.05);
  border-color:rgba(255,255,255,.1);
}
.nav-pill{
  display:inline-flex;
  align-items:center;
  justify-content:center;
  gap:.45rem;
  min-height:44px;
  padding:.72rem 1rem;
  border-radius:999px;
  border:1px solid rgba(255,255,255,.12);
  background:rgba(255,255,255,.03);
  color:#dfeaf6;
  font-weight:700;
  font-size:.95rem;
}
.nav-pill:hover,
.nav-pill.active{
  background:linear-gradient(135deg, rgba(65,224,190,.14), rgba(255,155,77,.12));
  border-color:rgba(65,224,190,.34);
  color:#fff;
}
.section-kicker{
  display:inline-flex;
  align-items:center;
  gap:.55rem;
  padding:.38rem .82rem;
  border-radius:999px;
  border:1px solid rgba(65,224,190,.22);
  background:rgba(65,224,190,.08);
  color:var(--accent);
  font-size:.8rem;
  font-weight:800;
  letter-spacing:.08em;
}
.section-title{
  margin:.95rem 0 0;
  font-size:clamp(1.65rem, 3.2vw, 2.45rem);
  line-height:1.12;
  font-weight:800;
  letter-spacing:-.02em;
}
.section-copy{
  margin-top:.9rem;
  max-width:62ch;
  color:var(--muted);
  line-height:1.85;
  font-size:1rem;
}
.ui-input{
  width:100%;
  min-height:48px;
  padding:.85rem 1rem;
  border-radius:999px;
  border:1px solid rgba(255,255,255,.12);
  background:rgba(5,10,16,.82);
  color:#fff;
  box-shadow:inset 0 1px 0 rgba(255,255,255,.03);
}
.ui-input::placeholder{color:#8193a7}
.ui-input:focus{
  border-color:rgba(65,224,190,.42);
  box-shadow:0 0 0 3px rgba(65,224,190,.10);
}
.stat-chip,
.badge{
  display:inline-flex;
  align-items:center;
  gap:.4rem;
  padding:.52rem .85rem;
  border-radius:999px;
  border:1px solid rgba(255,255,255,.12);
  background:rgba(255,255,255,.04);
  color:#dbe5ef;
  font-size:.82rem;
}
.badge{
  padding:.34rem .72rem;
  font-size:.78rem;
  font-weight:800;
}
.badge-accent{
  background:rgba(65,224,190,.12);
  color:var(--accent);
  border-color:rgba(65,224,190,.25);
}
.badge-warm{
  background:rgba(255,155,77,.12);
  color:var(--warm);
  border-color:rgba(255,155,77,.24);
}
.feature-card,
.story-card,
.price-card,
.update-card{
  transition:transform .2s ease, box-shadow .2s ease, border-color .2s ease, background-color .2s ease;
}
.feature-card:hover,
.story-card:hover,
.price-card:hover,
.update-card:hover{
  transform:translateY(-3px);
  border-color:rgba(65,224,190,.24);
  box-shadow:0 18px 48px rgba(0,0,0,.34);
}
.feature-mark{
  display:inline-flex;
  width:2.6rem;
  height:2.6rem;
  align-items:center;
  justify-content:center;
  border-radius:1rem;
  background:linear-gradient(135deg, rgba(65,224,190,.15), rgba(255,155,77,.12));
  border:1px solid rgba(255,255,255,.12);
  color:var(--accent);
  font-weight:900;
}
.article-body{
  color:#dfe7f1;
  line-height:1.95;
  font-size:1rem;
  max-width:100%;
}
.article-body > * + *{margin-top:1.15rem}
.article-body h2,
.article-body h3,
.article-body h4{
  color:#fff;
  font-weight:800;
  line-height:1.22;
  letter-spacing:-.02em;
  margin-top:2rem;
  margin-bottom:.8rem;
}
.article-body h2{font-size:clamp(1.35rem,2.6vw,1.9rem)}
.article-body h3{font-size:clamp(1.15rem,2vw,1.4rem)}
.article-body p{margin:0; color:#d8e3ef}
.article-body strong{color:#fff}
.article-body em{color:#f8fbff}
.article-body a{
  color:#7df0d0;
  text-decoration:underline;
  text-decoration-color:rgba(125,240,208,.3);
  text-underline-offset:3px;
}
.article-body ul,
.article-body ol{
  padding-left:1.25rem;
  margin:0;
  color:#d8e3ef;
}
.article-body li + li{margin-top:.55rem}
.article-body blockquote{
  margin:1.4rem 0;
  padding:1rem 1.1rem;
  border-left:3px solid rgba(65,224,190,.8);
  background:rgba(65,224,190,.08);
  color:#effaf6;
  border-radius:1rem;
}
.article-body figure{margin:1.4rem 0}
.article-body figure figcaption{
  margin-top:.55rem;
  color:#8fa0b4;
  font-size:.88rem;
}
.article-body img{
  border-radius:1.2rem;
  border:1px solid rgba(255,255,255,.1);
  box-shadow:var(--shadow-soft);
}
.article-body hr{
  border:0;
  border-top:1px solid var(--line);
  margin:1.6rem 0;
}
.article-body pre{
  overflow:auto;
  padding:1rem 1.1rem;
  border-radius:1rem;
  background:#0a1320;
  border:1px solid rgba(255,255,255,.1);
  color:#e6f0fb;
}
.article-body code{
  font-family:ui-monospace, SFMono-Regular, Menlo, Monaco, Consolas, monospace;
  font-size:.92em;
}
.article-body table{
  width:100%;
  border-collapse:collapse;
  margin:1.2rem 0;
  overflow:hidden;
  border-radius:1rem;
  border:1px solid rgba(255,255,255,.1);
}
.article-body th,
.article-body td{
  padding:.8rem .9rem;
  border-bottom:1px solid rgba(255,255,255,.08);
  text-align:left;
}
.article-body th{
  background:rgba(255,255,255,.04);
  color:#fff;
}
.article-body td{color:#d8e3ef}
.article-body table tr:last-child td{border-bottom:none}
.article-body :is(.note,.tip,.callout,.warning){
  padding:1rem 1.1rem;
  border-radius:1rem;
  border:1px solid rgba(255,255,255,.10);
  background:rgba(255,255,255,.04);
}
.footer-link{
  display:inline-flex;
  align-items:center;
  gap:.5rem;
  width:100%;
  padding:.82rem 1rem;
  border-radius:1rem;
  border:1px solid rgba(255,255,255,.10);
  background:rgba(255,255,255,.03);
  color:#dfeaf6;
}
.footer-link:hover{
  background:rgba(255,255,255,.06);
  border-color:rgba(65,224,190,.25);
  color:#fff;
}
.empty-state{
  border-radius:var(--radius);
}
.empty-state::before{
  content:"";
  position:absolute;
  inset:auto -10% -20% auto;
  width:300px;
  height:300px;
  border-radius:999px;
  background:radial-gradient(circle, rgba(65,224,190,.16), transparent 68%);
  pointer-events:none;
}
.fine-print{
  color:#7f93a8;
  font-size:.8rem;
  line-height:1.7;
}
@media (max-width:767px){
  .section-title{
    font-size:clamp(1.45rem, 7vw, 2rem);
  }
  .article-body{
    font-size:.98rem;
  }
}
@media (max-width:520px){
  .ui-btn,
  .nav-pill{
    width:100%;
  }
}