/* ==========================================================================
   VNPen Project — design system
   Dark by default, light theme via [data-theme="light"]. Shared by site + docs.
   字重只使用 400 / 500 / 700，与自托管的 HarmonyOS Sans SC 分片一致。
   ========================================================================== */

:root{
  /* surfaces */
  --bg:#080a0a;
  --bg-soft:#0b0d0d;
  --surface:#0d0f0f;
  --surface-2:#121415;
  --surface-3:#171a1b;
  --header-bg:rgba(8,10,10,.78);

  /* lines */
  --line:rgba(255,255,255,.07);
  --line-2:rgba(255,255,255,.12);
  --line-3:rgba(255,255,255,.2);

  /* ink */
  --fg:#f3f3f6;
  --fg-dim:#a4abb4;
  --fg-mute:#767d87;

  /* brand */
  --accent:#7a75e0;
  --accent-soft:#9e99e8;
  --accent-deep:#3f3a9e;
  --accent-ink:#ffffff;
  --accent-glow:rgba(122,117,224,.35);
  --accent-wash:rgba(122,117,224,.12);

  /* effects */
  --hero-glow:rgba(122,117,224,.16);
  --visual-wash:rgba(255,255,255,.035);
  --hover-wash:rgba(255,255,255,.05);
  --shadow-pop:0 12px 40px -16px rgba(0,0,0,.8);
  --shadow-shot:0 40px 120px -40px rgba(0,0,0,.9);
  --icon-invert:0;

  /* headline gradient — 自上到下 */
  --h1-from:#f1f0fd;
  --h1-to:#6f69dc;

  /* geometry */
  --r-sm:8px;
  --r:12px;
  --r-lg:16px;
  --r-xl:22px;
  --maxw:1200px;
  --gutter:24px;
  --header-h:64px;

  /* rhythm */
  --block:14px;              /* 卡片之间 */
  --section-gap:clamp(64px,8vw,104px);  /* 区块之间 */

  /* motion */
  --ease:cubic-bezier(.22,.61,.36,1);
  --ease-out:cubic-bezier(.16,1,.3,1);
  --fast:.16s;
  --mid:.28s;
  --slow:.6s;

  color-scheme:dark;
}

:root[data-theme="light"]{
  --bg:#ffffff;
  --bg-soft:#fbfbfc;
  --surface:#f8f8fa;
  --surface-2:#f2f2f6;
  --surface-3:#eaeaf0;
  --header-bg:rgba(255,255,255,.8);

  --line:rgba(16,18,24,.09);
  --line-2:rgba(16,18,24,.16);
  --line-3:rgba(16,18,24,.28);

  --fg:#14161c;
  --fg-dim:#4b525c;
  --fg-mute:#6e7682;

  --accent:#5f59d4;
  --accent-soft:#4f48c4;
  --accent-deep:#3f3a9e;
  --accent-ink:#ffffff;
  --accent-glow:rgba(95,89,212,.3);
  --accent-wash:rgba(95,89,212,.1);

  --hero-glow:rgba(122,117,224,.14);
  --visual-wash:rgba(16,18,24,.03);
  --hover-wash:rgba(16,18,24,.045);
  --shadow-pop:0 12px 40px -18px rgba(16,18,24,.28);
  --shadow-shot:0 36px 90px -40px rgba(16,18,24,.4);
  --icon-invert:1;

  --h1-from:#23223a;
  --h1-to:#5f59d4;

  color-scheme:light;
}

*,*::before,*::after{box-sizing:border-box}

html{
  -webkit-text-size-adjust:100%;
  scroll-behavior:smooth;
  scroll-padding-top:calc(var(--header-h) + 24px);
}

body{
  margin:0;
  background:var(--bg);
  color:var(--fg);
  font-family:"HarmonyOS Sans SC","HarmonyOS Sans",-apple-system,BlinkMacSystemFont,"Segoe UI",
              system-ui,"PingFang SC","Hiragino Sans GB","Microsoft YaHei","Noto Sans CJK SC",sans-serif;
  font-size:15px;
  font-weight:400;
  line-height:1.7;
  letter-spacing:.005em;
  -webkit-font-smoothing:antialiased;
  -moz-osx-font-smoothing:grayscale;
  overflow-x:hidden;
  transition:background-color var(--mid) var(--ease),color var(--mid) var(--ease);
}

img,svg,video{display:block;max-width:100%}
img{height:auto}
a{color:inherit;text-decoration:none}
button{font:inherit;color:inherit;background:none;border:0;cursor:pointer}
::selection{background:var(--accent-wash);color:var(--fg)}

:where(a,button,select,input,[tabindex]):focus-visible{
  outline:2px solid var(--accent);
  outline-offset:3px;
  border-radius:4px;
}

.wrap{width:100%;max-width:var(--maxw);margin-inline:auto;padding-inline:var(--gutter)}
.sr-only{position:absolute;width:1px;height:1px;padding:0;margin:-1px;overflow:hidden;clip:rect(0 0 0 0);white-space:nowrap;border:0}
.skip-link{
  position:fixed;top:8px;left:8px;z-index:999;
  transform:translateY(-200%);
  background:var(--accent);color:#fff;padding:10px 16px;border-radius:var(--r-sm);font-weight:500;
  transition:transform var(--fast) var(--ease);
}
.skip-link:focus{transform:none}

/* 图标类 PNG 为白色描边，浅色主题下反相 */
.tint{filter:invert(var(--icon-invert))}

/* ==========================================================================
   Header — 置顶时完全无背景，滚动后才出现玻璃底
   ========================================================================== */
.site-header{
  position:sticky;top:0;z-index:100;
  height:var(--header-h);
  background:transparent;
  border-bottom:1px solid transparent;
  transition:background-color var(--mid) var(--ease),border-color var(--mid) var(--ease),
             backdrop-filter var(--mid) var(--ease);
}
.site-header.is-stuck{
  background:var(--header-bg);
  border-bottom-color:var(--line);
  backdrop-filter:saturate(180%) blur(14px);
  -webkit-backdrop-filter:saturate(180%) blur(14px);
}
.site-header .wrap{height:100%;display:flex;align-items:center;gap:18px}

.brand{display:inline-flex;align-items:center;flex:none;color:var(--fg);transition:opacity var(--fast) var(--ease)}
.brand:hover{opacity:.72}
.brand svg{height:22px;width:auto}

.nav{display:flex;align-items:center;gap:2px;margin-inline:auto}
.nav a{
  position:relative;
  padding:7px 12px;border-radius:var(--r-sm);
  font-size:14px;font-weight:400;color:var(--fg-dim);
  transition:color var(--fast) var(--ease),background var(--fast) var(--ease);
}
.nav a:hover{color:var(--fg);background:var(--hover-wash)}
.nav a[aria-current="page"]{color:var(--fg);font-weight:500}
.nav a[aria-current="page"]::after{
  content:"";position:absolute;left:12px;right:12px;bottom:1px;height:1.5px;
  background:var(--accent);border-radius:2px;
}
.nav .ext::after{content:"↗";margin-left:4px;font-size:11px;opacity:.5}

.header-actions{display:flex;align-items:center;gap:8px;flex:none}

/* ---------- theme toggle ---------- */
.theme-toggle{
  width:34px;height:34px;flex:none;
  display:grid;place-items:center;border-radius:var(--r-sm);
  color:var(--fg-mute);border:1px solid transparent;
  transition:color var(--fast) var(--ease),background var(--fast) var(--ease),border-color var(--fast) var(--ease);
}
.theme-toggle:hover{color:var(--fg);background:var(--hover-wash);border-color:var(--line)}
.theme-toggle svg{width:16px;height:16px}
.theme-toggle .ico-sun{display:none}
:root[data-theme="light"] .theme-toggle .ico-sun{display:block}
:root[data-theme="light"] .theme-toggle .ico-moon{display:none}

/* ---------- download dropdown ---------- */
.dl-menu{position:relative;flex:none}
.dl-trigger{
  display:inline-flex;align-items:center;gap:7px;
  padding:8px 12px 8px 14px;border-radius:var(--r-sm);
  font-size:14px;font-weight:500;letter-spacing:.005em;
  color:var(--fg);border:1px solid var(--line-2);
  background:var(--surface-2);
  transition:border-color var(--fast) var(--ease),background var(--fast) var(--ease),color var(--fast) var(--ease);
}
.dl-trigger:hover{border-color:var(--line-3);background:var(--surface-3)}
.dl-trigger>svg:first-child{width:15px;height:15px;opacity:.75}
.dl-trigger .caret{width:11px;height:11px;opacity:.6;transition:transform var(--mid) var(--ease)}
.dl-trigger[aria-expanded="true"]{border-color:var(--line-3);background:var(--surface-3)}
.dl-trigger[aria-expanded="true"] .caret{transform:rotate(180deg)}

.dl-pop{
  position:absolute;top:calc(100% + 8px);right:0;z-index:120;
  width:290px;padding:6px;
  border:1px solid var(--line-2);border-radius:var(--r);
  background:var(--bg-soft);
  box-shadow:var(--shadow-pop);
  opacity:0;transform:translateY(-6px) scale(.985);visibility:hidden;
  transition:opacity var(--fast) var(--ease),transform var(--fast) var(--ease),visibility var(--fast);
}
.dl-menu.open .dl-pop{opacity:1;transform:none;visibility:visible}
.dl-pop .item{
  display:flex;align-items:flex-start;gap:11px;
  padding:10px 11px;border-radius:var(--r-sm);
  transition:background var(--fast) var(--ease);
}
.dl-pop a.item:hover{background:var(--hover-wash)}
.dl-pop .item .ic{flex:none;width:30px;height:30px;border-radius:9px;display:grid;place-items:center;overflow:hidden;background:var(--surface-2)}
.dl-pop .item .ic img{width:30px;height:30px;border-radius:9px}
.dl-pop .item .ic svg{width:16px;height:16px;color:var(--fg-dim)}
.dl-pop .item .tx{min-width:0;flex:1}
.dl-pop .item b{display:block;font-size:13.5px;font-weight:500;color:var(--fg);line-height:1.5}
.dl-pop .item span{display:block;font-size:12px;color:var(--fg-mute);line-height:1.5}
.dl-pop .item.disabled{opacity:.55}
.dl-pop .tag{
  flex:none;align-self:center;font-size:10.5px;padding:1px 7px;border-radius:999px;
  border:1px solid var(--line-2);color:var(--fg-mute);
}
.dl-pop hr{border:0;border-top:1px solid var(--line);margin:5px 7px}

.nav-toggle{
  display:none;width:34px;height:34px;border-radius:var(--r-sm);
  align-items:center;justify-content:center;
  border:1px solid var(--line);color:var(--fg-dim);
  transition:color var(--fast) var(--ease),border-color var(--fast) var(--ease);
}
.nav-toggle:hover{color:var(--fg);border-color:var(--line-2)}
.nav-toggle svg{width:18px;height:18px}
.nav-toggle .ico-close{display:none}
body.nav-open .nav-toggle .ico-close{display:block}
body.nav-open .nav-toggle .ico-open{display:none}

/* mobile drawer */
.mobile-nav{
  position:fixed;inset:var(--header-h) 0 auto 0;z-index:99;
  background:var(--bg);
  border-bottom:1px solid var(--line);
  padding:14px var(--gutter) 24px;
  display:none;
  max-height:calc(100dvh - var(--header-h));
  overflow-y:auto;
}
body.nav-open{overflow:hidden}
body.nav-open .mobile-nav{display:block;animation:drawer .32s var(--ease-out) both}
@keyframes drawer{from{opacity:0;transform:translateY(-10px)}to{opacity:1;transform:none}}
.mobile-nav a{
  display:flex;align-items:center;justify-content:space-between;
  padding:13px 4px;font-size:16px;color:var(--fg-dim);
  border-bottom:1px solid var(--line);
}
.mobile-nav a.btn{border-bottom:0}
.mobile-nav a:hover,.mobile-nav a[aria-current="page"]{color:var(--fg)}
.mobile-nav .btn{margin-top:18px;width:100%;justify-content:center}
.mobile-nav .mn-sub{
  margin-top:18px;padding-top:4px;
  font-size:11.5px;font-weight:500;letter-spacing:.08em;text-transform:uppercase;color:var(--fg-mute);
}

/* ==========================================================================
   Buttons
   ========================================================================== */
.btn{
  display:inline-flex;align-items:center;justify-content:center;gap:8px;
  padding:9px 18px;border-radius:var(--r-sm);
  font-size:14px;font-weight:500;letter-spacing:.005em;white-space:nowrap;
  border:1px solid transparent;
  transition:transform var(--fast) var(--ease),background var(--fast) var(--ease),
             border-color var(--fast) var(--ease),box-shadow var(--mid) var(--ease),opacity var(--fast) var(--ease);
}
.btn svg{width:16px;height:16px;flex:none}
.btn:active{transform:scale(.975)}

.btn-primary{background:var(--accent);color:var(--accent-ink)}
.btn-primary:hover{background:color-mix(in srgb,var(--accent) 86%,#fff);box-shadow:0 6px 24px -8px var(--accent-glow)}

.btn-light{background:var(--fg);color:var(--bg)}
.btn-light:hover{box-shadow:0 10px 30px -14px var(--accent-glow);opacity:.92}

.btn-ghost{border-color:var(--line-2);color:var(--fg-dim);background:transparent}
.btn-ghost:hover{color:var(--fg);border-color:var(--line-3);background:var(--hover-wash)}

.btn-lg{padding:13px 24px;font-size:15px;border-radius:var(--r)}

.tlink{
  display:inline-flex;align-items:center;gap:6px;flex:none;
  font-size:14px;font-weight:500;color:var(--accent-soft);
  transition:color var(--fast) var(--ease),gap var(--fast) var(--ease);
}
.tlink:hover{color:var(--accent);gap:9px}
.tlink svg{width:14px;height:14px;transition:transform var(--mid) var(--ease)}
.tlink:hover svg{transform:translateX(2px)}

/* ==========================================================================
   Section rhythm — 相邻区块只保留一份间距
   ========================================================================== */
.section{padding-block:var(--section-gap)}
.section+.section{padding-top:0}
.section-head{margin-bottom:clamp(24px,3.2vw,36px)}
.section-head .lead{
  margin:0;
  font-size:clamp(20px,2.7vw,30px);
  font-weight:700;line-height:1.5;letter-spacing:-.01em;
  color:var(--fg-mute);
  text-wrap:balance;
}
.section-head .lead strong{color:var(--fg);font-weight:700}
.section-head .lead .dim{color:var(--fg-dim);font-weight:500}
.section-head .row{display:flex;align-items:flex-end;justify-content:space-between;gap:24px;flex-wrap:wrap}
.eyebrow{margin:0 0 6px;font-size:clamp(20px,2.7vw,30px);font-weight:700;letter-spacing:-.01em;color:var(--fg)}

/* ==========================================================================
   Bento cards
   ========================================================================== */
.bento{display:grid;gap:var(--block)}
.bento+.bento{margin-top:var(--block)}
.bento-2{grid-template-columns:repeat(2,minmax(0,1fr))}
.bento-3{grid-template-columns:repeat(3,minmax(0,1fr))}
.bento-stack{display:grid;gap:var(--block);grid-auto-rows:1fr}
.bento-stack .card{display:flex;flex-direction:column;justify-content:center}
.bento-stack .card-aside,.bento-stack a.card-aside,.bento-stack button.card-aside{
  flex-direction:row;align-items:center;justify-content:flex-start;
}
.bento-wide{grid-column:1/-1}

.card{
  position:relative;isolation:isolate;overflow:hidden;
  background:var(--surface);
  border:1px solid var(--line);
  border-radius:var(--r-lg);
  padding:22px 24px;
  transition:border-color var(--mid) var(--ease),transform var(--mid) var(--ease),background var(--mid) var(--ease);
}
.card::before{
  content:"";position:absolute;inset:0;z-index:-1;opacity:0;
  background:radial-gradient(360px circle at var(--mx,50%) var(--my,0%),var(--accent-wash),transparent 65%);
  transition:opacity var(--slow) var(--ease);
}
.card:hover::before{opacity:1}
.card:hover{border-color:var(--line-2)}

a.card,button.card{display:block;width:100%;text-align:left;cursor:pointer}
a.card:hover,button.card:hover{transform:translateY(-2px);background:var(--surface-2)}
a.card::after{
  content:"";position:absolute;top:18px;right:18px;width:16px;height:16px;
  background:currentColor;color:var(--fg-mute);
  -webkit-mask:url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' viewBox='0 0 24 24' fill='none' stroke='%23000' stroke-width='2.2' stroke-linecap='round' stroke-linejoin='round'%3E%3Cpath d='M7 17 17 7M9 7h8v8'/%3E%3C/svg%3E") center/contain no-repeat;
  mask:url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' viewBox='0 0 24 24' fill='none' stroke='%23000' stroke-width='2.2' stroke-linecap='round' stroke-linejoin='round'%3E%3Cpath d='M7 17 17 7M9 7h8v8'/%3E%3C/svg%3E") center/contain no-repeat;
  opacity:0;transform:translate(-3px,3px);
  transition:opacity var(--mid) var(--ease),transform var(--mid) var(--ease),color var(--mid) var(--ease);
}
a.card:hover::after{opacity:1;transform:none;color:var(--accent-soft)}

.card h3{margin:0 0 8px;font-size:17px;font-weight:700;letter-spacing:-.005em;color:var(--fg)}
.card h3.sm{font-size:15.5px}
.card p{margin:0;font-size:13.5px;line-height:1.75;color:var(--fg-mute)}
.card p+p{margin-top:6px}
.card .card-note{color:var(--accent-soft);font-size:13px;margin-top:10px}

/* 顶部带视觉区的卡片 */
.card-visual{padding:0;display:flex;flex-direction:column}
.card-visual .visual{
  flex:1;min-height:150px;
  display:grid;place-items:center;
  padding:28px;
  border-bottom:1px solid var(--line);
  background:radial-gradient(120% 120% at 50% 0%,var(--visual-wash),transparent 70%);
}
.card-visual .visual img{width:auto;max-height:68px}
.card-visual .visual .mode-text{font-size:clamp(22px,3vw,30px);font-weight:700;letter-spacing:.04em;color:var(--fg)}
.card-visual .body{padding:20px 24px 24px}

/* 图标在右侧的卡片 —— a/button 也必须保持 flex row */
.card-aside,a.card-aside,button.card-aside{
  display:flex;flex-direction:row;align-items:center;gap:24px;
}
.card-aside .txt{flex:1;min-width:0}
.card-aside .art{flex:none;display:grid;place-items:center}
.card-aside .art img{width:64px;height:auto;border-radius:18px}
.card-aside .art img.flat{border-radius:0;width:50px}
.card-aside .art .ico{width:52px;height:52px;color:var(--fg)}
a.card-aside::after{top:16px;right:16px}

/* ==========================================================================
   Hero
   ========================================================================== */
.hero{position:relative;overflow:visible;padding-block:clamp(48px,8vw,92px) clamp(40px,6vw,64px)}
.hero::before{
  content:"";position:absolute;z-index:0;pointer-events:none;
  top:calc(var(--header-h) * -1 - 220px);left:22%;transform:translateX(-50%);
  width:min(1000px,150%);height:760px;
  background:radial-gradient(50% 50% at 50% 50%,var(--hero-glow),transparent 70%);
}
.hero .wrap{position:relative;z-index:1}
.hero-grid{display:grid;grid-template-columns:minmax(0,1fr) minmax(0,350px);align-items:center;gap:28px}

.hero h1{
  margin:0;
  font-size:clamp(40px,7.2vw,76px);
  line-height:1.14;font-weight:700;letter-spacing:-.02em;
  background:linear-gradient(180deg,var(--h1-from) 8%,var(--h1-to) 96%);
  -webkit-background-clip:text;background-clip:text;
  color:transparent;
  padding-bottom:.06em;
}
.hero h1 .l2{display:block}
.hero .sub{
  margin:22px 0 0;max-width:620px;
  font-size:clamp(14.5px,1.5vw,16.5px);line-height:1.75;color:var(--fg-mute);
  text-wrap:pretty;
}
.hero .cta{display:flex;flex-wrap:wrap;gap:12px;margin-top:30px}
.hero-art{position:relative;justify-self:end}
.hero-art img{width:min(100%,340px);filter:drop-shadow(0 24px 60px rgba(0,0,0,.35))}

/* ==========================================================================
   Comparison module
   ========================================================================== */
.compare{margin-top:var(--block)}
.compare-bar{display:flex;align-items:center;gap:18px;flex-wrap:wrap;margin-bottom:12px}
.compare-bar .label{font-size:17px;font-weight:700;color:var(--fg);letter-spacing:-.01em}
.tabs{position:relative;display:flex;gap:2px;flex-wrap:wrap}
.tabs button{
  position:relative;padding:6px 12px;border-radius:var(--r-sm);
  font-size:15px;font-weight:500;color:var(--fg-mute);
  transition:color var(--fast) var(--ease),background var(--fast) var(--ease);
}
.tabs button:hover{color:var(--fg-dim);background:var(--hover-wash)}
.tabs button[aria-selected="true"]{color:var(--fg);font-weight:700}
/* 选中态加粗会改变按钮宽度：用一份隐藏的粗体副本把宽度撑到最大值。
   既消掉切换时的横向抖动，也让指示条的几何量可以缓存，不必每次点击都读布局。 */
.tabs button::before{
  content:attr(data-label);
  display:block;height:0;overflow:hidden;white-space:nowrap;
  font-weight:700;visibility:hidden;pointer-events:none;
}
.tabs .ink{
  position:absolute;bottom:-1px;height:2px;border-radius:2px;background:var(--accent);
  transition:transform var(--mid) var(--ease),width var(--mid) var(--ease);
  pointer-events:none;
}
.compare-bar .spacer{flex:1}
.prompt-toggle{font-size:14px;color:var(--fg-mute);display:inline-flex;align-items:center;gap:7px;transition:color var(--fast) var(--ease)}
.prompt-toggle:hover,.prompt-toggle[aria-expanded="true"]{color:var(--fg)}
.prompt-toggle .chev{width:13px;height:13px;transition:transform var(--mid) var(--ease)}
.prompt-toggle[aria-expanded="true"] .chev{transform:rotate(180deg)}

.prompt-box{
  display:grid;grid-template-rows:0fr;margin-bottom:0;
  transition:grid-template-rows var(--mid) var(--ease),margin var(--mid) var(--ease);
}
.prompt-box.open{grid-template-rows:1fr;margin-bottom:12px}
.prompt-box>div{overflow:hidden}
.prompt-box .inner{
  border:1px dashed var(--line-2);border-radius:var(--r);
  background:var(--surface);
  padding:14px 16px;font-size:13px;line-height:1.75;color:var(--fg-dim);white-space:pre-wrap;
}

.compare-table{border:1px solid var(--line);border-radius:var(--r-lg);background:var(--surface);overflow:hidden}
.compare-head{display:grid;grid-template-columns:1fr 1fr;border-bottom:1px solid var(--line)}
.compare-head>div{
  display:flex;align-items:center;justify-content:center;gap:10px;
  padding:14px 16px;min-height:58px;font-size:15px;font-weight:500;
}
.compare-head>div+div{border-left:1px solid var(--line)}
.compare-head .mark{display:grid;place-items:center;width:20px;height:20px;flex:none;color:var(--fg)}
.compare-head .mark svg{width:13px;height:auto}
.compare-head .mark .logo{
  width:19px;height:19px;background:currentColor;
  -webkit-mask:var(--src) center/contain no-repeat;
  mask:var(--src) center/contain no-repeat;
}
.compare-head .fixed-name{color:var(--fg);font-weight:700}

.model-select{position:relative;display:inline-flex;align-items:center}
.model-select select{
  appearance:none;-webkit-appearance:none;
  background:var(--surface-2);border:1px solid var(--line-2);border-radius:999px;
  color:var(--fg);font-size:14px;font-weight:500;font-family:inherit;
  padding:6px 32px 6px 14px;cursor:pointer;
  transition:border-color var(--fast) var(--ease),background var(--fast) var(--ease);
}
.model-select select:hover{border-color:var(--line-3);background:var(--surface-3)}
.model-select .chev{position:absolute;right:12px;width:12px;height:12px;color:var(--fg-mute);pointer-events:none}

.compare-body{display:grid;grid-template-columns:1fr 1fr;min-height:0}
.compare-body>div+div{border-left:1px solid var(--line)}
.compare-pane{
  padding:22px 24px;font-size:13.5px;line-height:1.95;color:var(--fg-dim);
  height:clamp(380px,56vh,620px);overflow-y:auto;overscroll-behavior:contain;
  scrollbar-width:thin;scrollbar-color:var(--line-3) transparent;
}
.compare-pane::-webkit-scrollbar{width:8px}
.compare-pane::-webkit-scrollbar-track{background:transparent}
.compare-pane::-webkit-scrollbar-thumb{background:var(--line-2);border-radius:99px;border:2px solid transparent;background-clip:content-box}
.compare-pane:hover::-webkit-scrollbar-thumb{background:var(--line-3);background-clip:content-box}
.compare-pane .ph{color:var(--fg-mute);font-size:12px;letter-spacing:.06em;text-transform:uppercase;margin:0 0 14px}
.compare-pane p{margin:0 0 10px;white-space:pre-wrap}
.compare-pane p:last-child{margin-bottom:0}
.compare-pane .nar{color:var(--fg-mute)}
.compare-swap>*{animation:fadeUp .4s var(--ease-out) both}
@keyframes fadeUp{from{opacity:0;transform:translateY(6px)}to{opacity:1;transform:none}}

/* ==========================================================================
   Sponsors
   ========================================================================== */
.sponsor-grid{display:grid;grid-template-columns:repeat(3,minmax(0,1fr));gap:var(--block)}
.sponsor-grid .card{padding:18px 22px}
.sponsor-grid h3{margin:0 0 2px;font-size:16px}
.sponsor-grid p{font-size:13px}

/* ==========================================================================
   Download page
   ========================================================================== */
.dl-hero{position:relative;overflow:visible;padding-block:clamp(48px,8vw,84px) var(--section-gap)}
.dl-hero::before{
  content:"";position:absolute;z-index:0;pointer-events:none;
  top:calc(var(--header-h) * -1 - 200px);left:50%;transform:translateX(-50%);
  width:min(1100px,150%);height:680px;
  background:radial-gradient(50% 50% at 50% 50%,var(--hero-glow),transparent 70%);
}
.dl-hero .wrap{position:relative;z-index:1}
.dl-head{text-align:center;max-width:720px;margin-inline:auto}
.dl-head h1{
  margin:0;font-size:clamp(32px,5.5vw,52px);font-weight:700;letter-spacing:-.02em;line-height:1.18;
  background:linear-gradient(180deg,var(--h1-from) 10%,var(--h1-to) 98%);
  -webkit-background-clip:text;background-clip:text;color:transparent;padding-bottom:.06em;
}
.dl-head p{margin:14px auto 0;max-width:600px;font-size:clamp(14.5px,1.5vw,16.5px);color:var(--fg-mute)}
.dl-actions{display:flex;flex-wrap:wrap;gap:12px;justify-content:center;margin-top:28px}
.dl-meta{margin-top:16px;font-size:12.5px;color:var(--fg-mute)}

.shot{
  position:relative;margin:clamp(36px,5vw,56px) 0 0;
  border:1px solid var(--line-2);border-radius:var(--r-xl);
  background:var(--surface);overflow:hidden;
  box-shadow:var(--shadow-shot);
}
.shot img{width:100%;height:auto}

/* ==========================================================================
   404
   ========================================================================== */
.nf{min-height:62vh;display:grid;place-items:center;text-align:center;padding-block:80px}
.nf h1{
  margin:0;font-size:clamp(64px,14vw,132px);font-weight:700;letter-spacing:-.04em;
  background:linear-gradient(180deg,var(--h1-from),var(--h1-to));
  -webkit-background-clip:text;background-clip:text;color:transparent;
}
.nf p{margin:4px 0 26px;color:var(--fg-mute);font-size:15px}

/* ==========================================================================
   Footer
   ========================================================================== */
.site-footer{
  border-top:1px solid var(--line);
  padding-block:44px 32px;
  background:radial-gradient(60% 120% at 50% 0%,var(--accent-wash),transparent 70%),var(--bg);
}
.footer-grid{display:grid;grid-template-columns:minmax(0,1.5fr) repeat(3,minmax(0,1fr));gap:32px 24px}
.footer-brand svg{height:20px;width:auto;color:var(--fg)}
.footer-brand p{margin:14px 0 0;font-size:13px;line-height:1.7;color:var(--fg-mute);max-width:34ch}
.footer-col h4{margin:0 0 12px;font-size:12px;font-weight:500;letter-spacing:.08em;text-transform:uppercase;color:var(--fg-mute)}
.footer-col ul{list-style:none;margin:0;padding:0;display:grid;gap:9px}
.footer-col a{font-size:13.5px;color:var(--fg-dim);transition:color var(--fast) var(--ease)}
.footer-col a:hover{color:var(--fg)}
.footer-bottom{
  display:flex;align-items:center;justify-content:space-between;gap:16px;flex-wrap:wrap;
  margin-top:36px;padding-top:20px;border-top:1px solid var(--line);
  font-size:12.5px;color:var(--fg-mute);
}
.footer-bottom p{margin:0}
.footer-bottom .social{display:flex;gap:6px}
.footer-bottom .social a{
  width:32px;height:32px;display:grid;place-items:center;border-radius:var(--r-sm);
  color:var(--fg-mute);border:1px solid transparent;
  transition:color var(--fast) var(--ease),background var(--fast) var(--ease),border-color var(--fast) var(--ease);
}
.footer-bottom .social a:hover{color:var(--fg);background:var(--hover-wash);border-color:var(--line)}
.footer-bottom .social svg{width:16px;height:16px}

/* ==========================================================================
   Scroll reveal
   ========================================================================== */
.reveal{
  opacity:0;transform:translateY(14px);
  transition:opacity .62s var(--ease-out),transform .62s var(--ease-out);
  transition-delay:calc(var(--i,0) * 55ms);
  will-change:opacity,transform;
}
.reveal.in{opacity:1;transform:none}

/* ==========================================================================
   Responsive
   ========================================================================== */
@media (max-width:1100px){
  .nav{display:none}
  .nav-toggle{display:inline-flex}
  .dl-menu{display:none}
  .header-actions{margin-left:auto}
}
@media (max-width:980px){
  .bento-3{grid-template-columns:repeat(2,minmax(0,1fr))}
  .bento-3>.bento-stack{grid-column:1/-1;grid-auto-rows:auto}
}
@media (max-width:900px){
  .hero-grid{grid-template-columns:1fr;gap:10px}
  .hero-art{justify-self:center;max-width:420px;margin-top:4px;order:-1}
  .hero-copy{text-align:center}
  .hero .sub{max-width:none;margin-inline:auto}
  .hero .cta{justify-content:center}
  .footer-grid{grid-template-columns:1fr 1fr}
  .footer-brand{grid-column:1/-1}
}
@media (max-width:760px){
  :root{--gutter:18px}
  .sponsor-grid{grid-template-columns:1fr}
  .compare-body{grid-template-columns:1fr;min-height:0}
  .compare-body>div+div{border-left:0;border-top:1px solid var(--line)}
  .compare-pane{height:clamp(300px,46vh,420px)}
  .compare-head{grid-template-columns:1fr}
  .compare-head>div+div{border-left:0;border-top:1px solid var(--line)}
}
@media (max-width:720px){
  .bento-2,.bento-3{grid-template-columns:1fr}
  .card-visual .visual{min-height:120px;padding:22px}
  .card-aside,a.card-aside,button.card-aside{gap:16px}
  .card-aside .art img{width:52px;border-radius:15px}
  .card-aside .art img.flat{width:42px}
  .card-aside .art .ico{width:42px;height:42px}
}
@media (max-width:520px){
  .footer-grid{grid-template-columns:1fr}
  .hero .cta .btn,.dl-actions .btn{width:100%}
}

@media (prefers-reduced-motion:reduce){
  html{scroll-behavior:auto}
  *,*::before,*::after{
    animation-duration:.001ms!important;animation-iteration-count:1!important;
    transition-duration:.001ms!important;scroll-behavior:auto!important;
  }
  .reveal{opacity:1;transform:none}
}

/* 对比内容未填充时的占位 */
.compare-pane .pend{
  display:inline-flex;align-items:center;gap:8px;
  padding:7px 12px;border:1px dashed var(--line-2);border-radius:999px;
  font-size:12.5px;color:var(--fg-mute);
}
/* 长提示词展开区可滚动，不把版面撑开 */
.prompt-box .inner{max-height:300px;overflow:auto}

/* 续写：前文整段弱化，与模型输出区分 */
.compare-pane .ctx{
  margin:0 0 16px;padding:0 0 14px;
  border-bottom:1px dashed var(--line-2);
  color:var(--fg-mute);opacity:.65;
}
.compare-pane .ctx .ctx-label{
  margin:0 0 8px;font-size:11px;font-weight:500;letter-spacing:.1em;
  text-transform:uppercase;color:var(--fg-mute);opacity:.9;
}
.compare-pane .ctx p{margin:0 0 4px;line-height:1.85}
.compare-pane .ctx p:last-child{margin-bottom:0}