/* 字体：Fraunces、Nunito、Caveat（SIL OFL 1.1，随网站自带，见 fonts/LICENSE-*.txt） */
@font-face{font-family:'Fraunces';font-style:normal;font-weight:400;font-display:swap;src:url(fonts/fraunces-latin-400-normal.woff2) format('woff2')}
@font-face{font-family:'Fraunces';font-style:normal;font-weight:600;font-display:swap;src:url(fonts/fraunces-latin-600-normal.woff2) format('woff2')}
@font-face{font-family:'Fraunces';font-style:normal;font-weight:800;font-display:swap;src:url(fonts/fraunces-latin-800-normal.woff2) format('woff2')}
@font-face{font-family:'Fraunces';font-style:italic;font-weight:500;font-display:swap;src:url(fonts/fraunces-latin-500-italic.woff2) format('woff2')}
@font-face{font-family:'Nunito';font-style:normal;font-weight:400;font-display:swap;src:url(fonts/nunito-latin-400-normal.woff2) format('woff2')}
@font-face{font-family:'Nunito';font-style:normal;font-weight:600;font-display:swap;src:url(fonts/nunito-latin-600-normal.woff2) format('woff2')}
@font-face{font-family:'Nunito';font-style:normal;font-weight:700;font-display:swap;src:url(fonts/nunito-latin-700-normal.woff2) format('woff2')}
@font-face{font-family:'Nunito';font-style:normal;font-weight:800;font-display:swap;src:url(fonts/nunito-latin-800-normal.woff2) format('woff2')}
@font-face{font-family:'Caveat';font-style:normal;font-weight:500;font-display:swap;src:url(fonts/caveat-latin-500-normal.woff2) format('woff2')}
@font-face{font-family:'Caveat';font-style:normal;font-weight:700;font-display:swap;src:url(fonts/caveat-latin-700-normal.woff2) format('woff2')}

/* XLAB 设计系统 "A · Watercolor" 的常春钥变体：主色为常春藤绿 */
:root{
  --paper:#FBF6EE; --card:#FFFDF9; --ink:#2A2238; --ink-2:#3A3048; --muted:#4A4058; --muted-2:#5A4F68;
  --line:rgba(42,34,56,.12); --on-ink:#FBF6EE; --on-ink-muted:#D9D1E4;
  --accent:#23744A; --accent-2:#2F8F5B; --plum:#8A3F67; --kicker-dark:#9FE0BC;
  --rose:232,106,142; --cobalt:74,111,209; --sun:242,193,78; --teal:63,167,163; --violet:154,106,214; --apricot:244,162,97; --ivy:47,143,91;
  --f-display:'Fraunces',"Noto Serif CJK SC","Source Han Serif SC","Songti SC","STSong",Georgia,serif;
  --f-hand:'Caveat',"Kaiti SC","STKaiti","KaiTi","Noto Serif CJK SC",cursive;
  --f-body:'Nunito',"PingFang SC","Noto Sans CJK SC","Microsoft YaHei",system-ui,sans-serif;
  --r-card:28px; --max:1180px; --gutter:32px;
  color-scheme:light;
}
@media (max-width:900px){:root{--gutter:20px}}
@media (max-width:560px){:root{--gutter:16px}}
*{box-sizing:border-box}
html{-webkit-text-size-adjust:100%;scroll-behavior:smooth}
body{margin:0;background:var(--paper);color:var(--ink);font:400 17px/1.65 var(--f-body);overflow-x:hidden}
img{max-width:100%;height:auto;display:block}
a{color:var(--accent)}
a:hover{color:var(--plum)}
.skip-link{position:absolute;left:-999px;top:8px;background:var(--ink);color:var(--on-ink);padding:8px 14px;border-radius:999px;z-index:10}
.skip-link:focus{left:16px}
:focus-visible{outline:3px solid rgba(var(--ivy),.55);outline-offset:3px;border-radius:6px}
.wrap{max-width:var(--max);margin:0 auto;padding:0 var(--gutter)}
.page{position:relative;overflow:hidden;min-height:100vh}

/* 水彩晕染 */
.wc-layer{position:absolute;inset:0;pointer-events:none;z-index:0}
.wc{position:absolute;pointer-events:none;border-radius:46% 54% 42% 58% / 52% 44% 56% 48%;
  background:radial-gradient(circle at 45% 45%,rgba(var(--c),.55),rgba(var(--c),.22) 45%,rgba(var(--c),0) 70%);filter:blur(28px);opacity:.9;z-index:0}
@media (prefers-reduced-motion:no-preference){
  .drift1{animation:drift1 38s ease-in-out infinite alternate}
  .drift2{animation:drift2 44s ease-in-out infinite alternate}
  .drift3{animation:drift3 52s ease-in-out infinite alternate}
}
@keyframes drift1{to{transform:translate(40px,30px) rotate(8deg) scale(1.05)}}
@keyframes drift2{to{transform:translate(-36px,24px) rotate(-6deg) scale(1.04)}}
@keyframes drift3{to{transform:translate(24px,-34px) rotate(5deg) scale(1.06)}}
main,header,footer{position:relative;z-index:1}
section{position:relative}

/* 页头 */
.site-header .wrap{display:flex;align-items:center;justify-content:space-between;gap:12px 24px;flex-wrap:wrap;padding-top:22px;padding-bottom:22px}
.logo{display:flex;align-items:center;gap:10px;text-decoration:none;color:var(--ink)}
.logo .name{font:800 1.45rem/1 var(--f-display);letter-spacing:-.01em}
.logo .by{font:500 1.15rem/1 var(--f-hand);color:var(--plum);margin-left:2px;transform:translateY(3px)}
.logo.small .name{font-size:1.15rem}
.nav{display:flex;align-items:center;gap:6px 22px;flex-wrap:wrap}
.nav a{color:var(--ink);text-decoration:none;font-weight:700;font-size:.95rem;position:relative}
.nav a[aria-current]::after,.nav a:not(.lang-btn):hover::after{content:"";position:absolute;left:-4px;right:-4px;bottom:-5px;height:5px;border-radius:4px;background:rgba(var(--ivy),.35);filter:blur(1px)}
.lang-btn{border:1.6px solid var(--ink);border-radius:999px;padding:5px 14px}
.lang-btn:hover{background:var(--ink);color:var(--on-ink)!important}

/* 文字 */
.kicker{font:500 1.45rem/1.1 var(--f-hand);color:var(--plum);margin:0 0 6px}
.lang-zh .kicker{font-size:1.2rem;letter-spacing:.06em}
h1,h2,h3{font-family:var(--f-display);color:var(--ink);letter-spacing:-.015em}
h1{font-weight:800;font-size:clamp(2.4rem,5vw,3.9rem);line-height:1.05;margin:0 0 18px}
h2{font-weight:800;font-size:clamp(1.9rem,3.6vw,2.8rem);line-height:1.1;margin:0}
h3{font-weight:600;font-size:1.3rem;line-height:1.25;margin:0 0 6px}
.lang-zh h1{line-height:1.2;letter-spacing:.01em}
.lang-zh h2{line-height:1.25}
.tagline{font:italic 500 clamp(1.15rem,2vw,1.4rem)/1.45 var(--f-display);color:var(--ink-2);margin:0 0 26px;max-width:34em}
.lang-zh .tagline{font-style:normal;font-family:var(--f-body);font-weight:400}
.lead{color:var(--muted);font-size:1.05rem;max-width:30em;margin:0}

/* 按钮 */
.actions{display:flex;flex-wrap:wrap;gap:12px}
.btn{display:inline-flex;align-items:center;gap:8px;padding:12px 26px;border-radius:999px;font-weight:700;text-decoration:none;font-size:1rem;border:1.6px solid transparent;transition:transform .15s ease}
.btn:hover{transform:translateY(-1px)}
.btn.dark{background:var(--ink);color:var(--on-ink)}
.btn.dark:hover{color:var(--on-ink);background:#3b3150}
.btn.ghost{border-color:var(--ink);color:var(--ink);background:rgba(255,253,249,.6)}
.btn.accent{background:var(--accent);color:#fff}
.btn.accent:hover{background:var(--accent-2);color:#fff}
.chips{list-style:none;display:flex;flex-wrap:wrap;gap:8px;padding:0;margin:26px 0 0}
.chips li{font-size:.78rem;font-weight:700;letter-spacing:.08em;text-transform:uppercase;color:var(--muted-2);border:1px solid var(--line);background:rgba(255,253,249,.7);border-radius:999px;padding:4px 12px}

/* 首屏 */
.hero{padding:40px 0 90px}
.hero-grid{display:grid;grid-template-columns:minmax(0,.92fr) minmax(0,1.3fr);gap:48px;align-items:center;position:relative}
.hero-art{position:relative;padding:0 40px 50px 0;margin-right:-20px}
.hero-art .mac{border-radius:18px;box-shadow:0 30px 70px -20px rgba(42,34,56,.35),0 0 0 1px var(--line)}
.phone{margin:0;border:9px solid var(--ink);border-radius:42px;overflow:hidden;background:#fff;box-shadow:0 24px 50px -18px rgba(42,34,56,.45)}
.phone img{width:100%}
.hero-phone{position:absolute;right:0;bottom:-20px;width:25%;min-width:110px;transform:rotate(4deg)}

/* 区块 */
.section{padding:70px 0}
.section.tight{padding:10px 0 80px}
.section-head{display:flex;justify-content:space-between;align-items:flex-end;gap:16px 40px;flex-wrap:wrap;margin-bottom:34px}
.section-head.center{justify-content:center;text-align:center}
.grid3{display:grid;grid-template-columns:repeat(3,minmax(0,1fr));gap:22px}
.card{background:var(--card);border:1px solid var(--line);border-radius:var(--r-card);position:relative;overflow:hidden}
.feat{padding:26px 26px 24px;box-shadow:0 10px 30px -22px rgba(42,34,56,.35)}
.feat::before{content:"";position:absolute;width:260px;height:240px;top:-90px;right:-90px;border-radius:50%;
  background:radial-gradient(circle,rgba(var(--c),.5),rgba(var(--c),0) 68%);filter:blur(12px)}
.feat>*{position:relative}
.card-ico{width:46px;height:46px;border-radius:14px;border:1px solid var(--line);background:var(--card);display:grid;place-items:center;margin-bottom:18px;color:var(--ink)}
.feat p{margin:0;color:var(--ink-2);font-size:.98rem}

/* 截图 */
.phones{display:grid;grid-template-columns:repeat(4,minmax(0,1fr));gap:26px;align-items:start;max-width:980px;margin:0 auto}
.phones .low{margin-top:44px}

/* 深色带 */
.band{background:var(--ink);color:var(--on-ink);padding:90px 0;overflow:hidden}
.band .wc{opacity:.55}
.band .kicker{color:var(--kicker-dark)}
.band h2,.band h3{color:var(--on-ink)}
.band-grid{display:grid;grid-template-columns:minmax(0,.9fr) minmax(0,1.4fr);gap:40px;position:relative;z-index:1}
.band-items{display:grid;grid-template-columns:repeat(3,minmax(0,1fr));gap:26px}
.band-items p{color:var(--on-ink-muted);margin:0;font-size:.97rem}

/* 结尾号召 */
.cta{text-align:center;padding:100px 0 110px}
.cta .wrap{position:relative;z-index:1}
.cta .lead{margin:14px auto 26px}

/* 内容页 */
.page-hero{padding:30px 0 34px}
.crumbs{font-size:.88rem;font-weight:700;color:var(--muted-2);margin:0 0 18px}
.crumbs a{color:inherit;text-decoration:none}
.crumbs a:hover{text-decoration:underline}
.page-hero h1{font-size:clamp(2.1rem,4.6vw,3.4rem);max-width:18em}
.prose{padding:40px clamp(20px,5vw,56px) 44px;max-width:900px;box-shadow:0 14px 40px -28px rgba(42,34,56,.4)}
.prose>:first-child{margin-top:0}
.prose h1{font-size:2rem}
.prose h2{font-size:1.55rem;margin:1.9em 0 .5em}
.prose h3{font-size:1.18rem;margin:1.6em 0 .4em}
.prose p,.prose li{color:var(--ink-2)}
.prose ul,.prose ol{padding-left:1.3em}
.prose li{margin:6px 0}
.prose hr{border:0;border-top:1px solid var(--line);margin:2em 0}
.prose code{background:rgba(var(--ivy),.09);border-radius:6px;padding:1px 6px;font-size:.9em;overflow-wrap:anywhere}
.prose pre{background:var(--ink);color:var(--on-ink);border-radius:16px;padding:16px 18px;overflow-x:auto}
.prose pre code{background:none;padding:0;color:inherit}
.prose blockquote{margin:18px 0;padding:12px 20px;border-radius:18px;background:rgba(var(--sun),.16);border:1px solid rgba(var(--sun),.35);color:var(--ink-2)}
.prose blockquote p{margin:.3em 0}
.table{overflow-x:auto;margin:18px 0;border:1px solid var(--line);border-radius:18px}
table{border-collapse:collapse;width:100%;font-size:.95rem}
th,td{padding:11px 14px;text-align:left;vertical-align:top;border-bottom:1px solid var(--line)}
tr:last-child td{border-bottom:0}
th{background:rgba(var(--ivy),.07);font-weight:700}

/* 页脚 */
.site-footer{border-top:1px solid var(--line);margin-top:10px}
.site-footer .wrap{display:flex;align-items:center;justify-content:space-between;gap:14px 28px;flex-wrap:wrap;padding-top:30px;padding-bottom:36px}
.foot-links{display:flex;gap:6px 18px;flex-wrap:wrap}
.foot-links a{color:var(--ink);font-size:.9rem}
.copy{margin:0;color:var(--muted);font-size:.88rem}

/* 窄屏 */
@media (max-width:900px){
  .hero{padding:18px 0 60px}
  .hero-grid{grid-template-columns:1fr}
  .hero-art{padding:0 30px 40px 0;margin-right:0;max-width:640px}
  .grid3{grid-template-columns:repeat(2,minmax(0,1fr))}
  .band-grid{grid-template-columns:1fr}
  .phones{grid-template-columns:repeat(2,minmax(0,1fr));max-width:520px}
  .phones .low{margin-top:0}
}
@media (max-width:620px){
  body{font-size:16px}
  .grid3,.band-items{grid-template-columns:1fr}
  .section{padding:52px 0}
  .band{padding:64px 0}
  .logo .by{display:none}
  .nav{gap:6px 14px}
  .site-footer .wrap{flex-direction:column;align-items:flex-start}
  .table{border:0;overflow:visible}
  .table thead{display:none}
  .table table,.table tbody,.table tr,.table td{display:block;width:100%}
  .table tr{border:1px solid var(--line);border-radius:18px;margin:0 0 12px;padding:6px 0;background:var(--card)}
  .table td{border:0;padding:6px 16px}
  .table td[data-label]:not([data-label=""])::before{content:attr(data-label);display:block;font-size:.72rem;font-weight:800;letter-spacing:.08em;text-transform:uppercase;color:var(--muted-2)}
  .prose{padding:26px 18px 30px}
}