/* ============================================================
   xiejia.fun — 视觉基线
   深色 #08090A / 青 #3DD9FF / 栅格化留白
   ============================================================ */

:root{
  --bg:#08090A;
  --bg-2:#0B0D0F;
  --ink:#EFEFEF;
  --dim:#8A8D92;
  --mute:#55585D;
  --line:#1E2125;
  --line-2:#3A3D42;
  --accent:#3DD9FF;
  --accent-deep:#0FA6CC;
  --paper:#EFEFEF;
  --paper-ink:#08090A;
  --mono:'Chakra Petch',ui-monospace,SFMono-Regular,monospace;
  --sans:'Noto Sans SC',-apple-system,BlinkMacSystemFont,'Segoe UI',sans-serif;
}

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

html{
  scroll-behavior:smooth;
  -webkit-text-size-adjust:100%;
}
@media (prefers-reduced-motion:reduce){
  html{scroll-behavior:auto}
}

body{
  margin:0;
  background:var(--bg);
  color:var(--ink);
  font-family:var(--sans);
  -webkit-font-smoothing:antialiased;
  text-rendering:optimizeLegibility;
  overflow-x:hidden;
}

a{color:var(--ink);text-decoration:none;transition:color .3s}
a:hover{color:var(--accent)}

section[id]{scroll-margin-top:92px}

img,canvas{display:block;max-width:100%}

/* ── 载入遮罩 ─────────────────────────────────────────── */
.boot{
  position:fixed;inset:0;z-index:90;
  background:var(--bg);
  display:flex;flex-direction:column;justify-content:flex-end;
  padding:clamp(24px,5vw,64px);
  pointer-events:none;
  opacity:1;transition:opacity .7s ease;
}
.boot.off{opacity:0}
.boot-word{
  font-family:var(--mono);font-weight:700;
  font-size:clamp(40px,7vw,96px);line-height:1;letter-spacing:.02em;
}
.boot-row{
  display:flex;justify-content:space-between;align-items:center;
  margin-top:16px;
  font-family:var(--mono);font-size:13px;letter-spacing:.2em;color:#7C7F84;
}
.boot-bar{height:1px;background:#2A2C30;margin-top:14px}
.boot-bar i{display:block;height:1px;width:0;background:var(--accent);transition:width .12s linear}

/* ── 顶栏 ─────────────────────────────────────────────── */
.hd{
  position:fixed;top:0;left:0;right:0;z-index:40;
  display:flex;justify-content:space-between;align-items:center;gap:16px;
  padding:clamp(14px,1.9vw,22px) clamp(20px,4vw,56px);
  background:rgba(8,9,10,.72);
  backdrop-filter:blur(14px);-webkit-backdrop-filter:blur(14px);
  border-bottom:1px solid transparent;
  transition:background .4s,border-color .4s;
}
.hd.solid{background:rgba(8,9,10,.94);border-bottom-color:var(--line)}

.hd-logo{display:flex;align-items:center;gap:11px}
.hd-mark{
  width:10px;height:10px;flex:0 0 auto;
  background:var(--accent);
  box-shadow:0 0 14px rgba(61,217,255,.9);
}
.hd-name{
  font-family:var(--mono);font-weight:700;font-size:23px;letter-spacing:.03em;
  color:#fff;
}

.hd-right{display:flex;align-items:center;gap:clamp(10px,1.6vw,22px);min-width:0}

.hd-nav{display:flex;align-items:center;gap:clamp(18px,2.6vw,42px)}
.hd-nav a{display:flex;flex-direction:column;gap:3px;color:#D8DBDF}
.hd-nav a i{
  font-family:var(--mono);font-style:normal;font-size:11px;
  letter-spacing:.18em;color:#8E949C;transition:color .35s;
}
.hd-nav a b{font-size:15px;font-weight:600;letter-spacing:.1em}
.hd-nav a:hover{color:#fff}
.hd-nav a:hover i{color:var(--accent)}

/* 顶栏按钮：QQ群 / 试用码 */
.hd-qq{
  flex:0 0 auto;white-space:nowrap;
  display:flex;align-items:center;gap:8px;
  padding:9px 15px;min-height:42px;
  background:transparent;border:1px solid #4A5058;
  color:#fff;cursor:pointer;
  font-family:var(--sans);font-size:13.5px;font-weight:500;letter-spacing:.06em;
  transition:border-color .35s,color .35s,background .35s;
}
.hd-qq:hover{border-color:var(--accent);color:var(--accent);background:rgba(61,217,255,.06)}
.hd-qq.done{border-color:var(--accent);color:var(--accent);background:rgba(61,217,255,.1)}

/* QQ 群那枚：青色点缀，做视觉重点 */
.hd-qq-ico{
  width:19px;height:22px;flex:0 0 auto;
  display:block;
  object-fit:contain;
  transition:transform .35s,opacity .35s;
}
.hd-qq:hover .hd-qq-ico{transform:scale(1.08)}
.hd-qq > span{color:#CDD2D8;font-size:13px;letter-spacing:.04em;transition:color .35s}
.hd-qq:hover > span{color:var(--accent)}
.hd-qq > b{
  font-family:var(--mono);font-weight:600;font-size:15.5px;letter-spacing:.04em;
}
/* QQ 群按钮：默认带一点青色边和底，比试用码更醒目 */
#copyQQ{border-color:rgba(61,217,255,.32);background:rgba(61,217,255,.05)}
#copyQQ > b{color:#7FE6FF}

/* 试用码那枚：弱一档但保证可读 */
.hd-code{border-color:#424850}
.hd-code > b{color:#EDEFF2;font-size:14.5px;letter-spacing:.03em}
.hd-code:hover > b{color:var(--accent)}

/* ── 首页 ─────────────────────────────────────────────── */
.hero{
  position:relative;
  min-height:100svh;
  display:flex;flex-direction:column;justify-content:center;align-items:center;
  padding:clamp(104px,13.5vh,136px) clamp(20px,4vw,56px) clamp(56px,8vh,88px);
  overflow:hidden;
}
.hero::before{
  content:'';position:absolute;inset:0;pointer-events:none;
  background:
    radial-gradient(ellipse 60% 45% at 50% 34%,rgba(61,217,255,.09),transparent 70%),
    linear-gradient(180deg,rgba(8,9,10,0) 60%,rgba(8,9,10,.9) 100%);
}
.hero-in{
  position:relative;z-index:1;
  width:min(100%,1180px);
  display:flex;flex-direction:column;align-items:center;
}

.hero-strip{
  width:100%;display:flex;justify-content:flex-end;gap:16px;
  font-family:var(--mono);font-size:11px;letter-spacing:.3em;color:#55585D;
}
.hero-strip > span:empty{display:none}

.hero-mark{
  width:100%;
  height:clamp(88px,min(20vw,24vh),260px);
  margin-top:clamp(16px,3vh,30px);
}

.hero-scan{
  position:relative;width:100%;
  margin-top:clamp(2px,.6vh,8px);
}
.hero-wave{
  width:100%;
  height:clamp(42px,7vh,74px);
}

.hero-copy{
  display:flex;flex-direction:column;align-items:center;
  gap:clamp(10px,1.6vh,16px);
  margin-top:clamp(28px,5vh,50px);
  text-align:center;
}
.hero-copy h1{
  margin:0;
  font-weight:900;
  font-size:clamp(24px,min(3vw,5.4vh),44px);
  letter-spacing:.1em;line-height:1.25;
}
.hero-sub{
  margin:0;max-width:940px;
  font-size:clamp(14px,1.1vw,16px);font-weight:300;
  letter-spacing:.04em;line-height:1.9;color:var(--dim);
  text-wrap:pretty;
}
.hero-badge{
  margin:0;padding:7px 15px;
  border:1px solid var(--accent);
  font-size:clamp(12px,1vw,14px);font-weight:500;
  letter-spacing:.12em;line-height:1.6;color:var(--accent);
}
.hero-badge strong{
  font-family:var(--mono);letter-spacing:.08em;
  user-select:all;cursor:text;
}

.hero-note{
  margin:14px 0 0;max-width:660px;
  font-size:12px;line-height:1.8;text-align:center;color:#B5B8BC;
}

/* ── 下载按钮 ─────────────────────────────────────────── */
.dl-wrap{
  position:relative;width:fit-content;max-width:100%;
  margin-top:clamp(24px,4vh,40px);
}

.dl-btn{
  position:relative;overflow:hidden;
  display:flex;align-items:center;gap:clamp(18px,2vw,26px);
  width:min(100%,460px);
  padding:clamp(15px,2.2vh,22px) clamp(24px,2.6vw,34px);
  background:var(--accent);
  color:#08090A;
  isolation:isolate;
  transition:transform .4s cubic-bezier(.2,.8,.2,1),box-shadow .4s;
}
.dl-btn:hover{color:#08090A;transform:translateY(-2px);
  box-shadow:0 12px 34px rgba(61,217,255,.28)}

.dl-fill{
  position:absolute;inset:0;background:#fff;
  transform-origin:left center;transform:scaleX(0);
  transition:transform .55s cubic-bezier(.76,0,.18,1);
  z-index:-1;
}
.dl-btn:hover .dl-fill{transform:scaleX(1)}

.dl-ico{
  position:relative;flex:0 0 auto;
  width:clamp(50px,6vh,60px);height:clamp(50px,6vh,60px);
  border-radius:50%;
  background:#08090A;
  display:flex;align-items:center;justify-content:center;
  overflow:hidden;
}
.dl-btn.dark .dl-ico{background:var(--accent)}
.dl-ring{
  position:absolute;inset:4px;border-radius:50%;
  border:2px solid var(--accent);
  opacity:0;transform:scale(.6);
  transition:opacity .45s,transform .55s cubic-bezier(.2,.8,.2,1);
}
.dl-btn.dark .dl-ring{border-color:#08090A}
.dl-btn:hover .dl-ring{opacity:1;transform:scale(1)}

.dl-arrow{display:flex;flex-direction:column;align-items:center;transition:transform .45s cubic-bezier(.34,1.56,.64,1)}
.dl-btn:hover .dl-arrow{transform:translateY(3px)}
.dl-arrow i{display:block;background:var(--accent)}
.dl-btn.dark .dl-arrow i{background:#08090A}
.dl-arrow i:nth-child(1){width:2px;height:18px}
.dl-arrow i:nth-child(2){
  width:11px;height:11px;background:transparent;
  border-right:2px solid var(--accent);border-bottom:2px solid var(--accent);
  transform:rotate(45deg);margin-top:-11px;
}
.dl-btn.dark .dl-arrow i:nth-child(2){
  background:transparent;
  border-right-color:#08090A;border-bottom-color:#08090A;
}
.dl-arrow i:nth-child(3){width:18px;height:2px;margin-top:5px}

.dl-txt{
  position:relative;flex:1 1 0;min-width:0;
  display:flex;flex-direction:column;gap:6px;
}
.dl-main{font-weight:900;font-size:clamp(26px,2.6vw,36px);letter-spacing:.16em;line-height:1}
.dl-meta{
  font-family:var(--mono);font-weight:500;
  font-size:11.5px;letter-spacing:.1em;
  color:rgba(8,9,10,.62);
}

/* ── 功能 ─────────────────────────────────────────────── */
.feat{
  position:relative;
  padding:clamp(80px,10vh,112px) clamp(20px,4vw,56px);
  background:var(--bg-2);
  border-top:1px solid var(--line);
}
.wrap{width:min(100%,1180px);margin:0 auto}

.eyebrow{
  margin:0 0 20px;
  font-family:var(--mono);font-size:12px;letter-spacing:.2em;
  color:var(--accent);
}
.title{
  margin:0;
  font-size:clamp(28px,3vw,42px);font-weight:900;
  letter-spacing:.08em;line-height:1.4;
}
.title.sm{font-size:clamp(22px,2.2vw,30px);margin-bottom:22px;letter-spacing:.1em}

.feat-grid{
  display:grid;grid-template-columns:repeat(3,minmax(0,1fr));
  gap:clamp(24px,3vw,48px);
  margin-top:clamp(36px,5vh,52px);
}
.feat-card{min-width:0;padding-top:24px;border-top:1px solid var(--line-2)}
.num{font-family:var(--mono);font-size:13px;letter-spacing:.2em;color:var(--accent)}
.feat-card h3{
  margin:18px 0 16px;
  font-size:clamp(20px,1.8vw,25px);font-weight:700;
  letter-spacing:.04em;line-height:1.6;
}
.feat-card p{
  margin:0;color:#C9CBCE;
  font-size:15.5px;line-height:1.9;letter-spacing:.04em;
  text-wrap:pretty;
}

.feat-two{
  display:grid;grid-template-columns:repeat(2,minmax(0,1fr));
  gap:clamp(32px,5vw,80px);
  margin-top:clamp(56px,8vh,80px);
  padding-top:clamp(36px,5vh,44px);
  border-top:1px solid var(--line);
}

.ticks{list-style:none;margin:0;padding:0}
.ticks li{
  position:relative;padding-left:24px;margin-top:12px;
  color:#C9CBCE;font-size:15.5px;line-height:1.9;letter-spacing:.04em;
}
.ticks li::before{
  content:'';position:absolute;left:0;top:.92em;
  width:12px;height:1px;background:var(--accent);
}

/* ── 下载区（浅底） ───────────────────────────────────── */
.end{
  position:relative;
  min-height:100svh;
  display:flex;flex-direction:column;justify-content:space-between;
  padding:clamp(92px,13vh,136px) clamp(20px,4vw,56px) clamp(20px,3vw,34px);
  background:var(--paper);
  color:var(--paper-ink);
}
.end a{color:var(--paper-ink)}
.end a:hover{color:var(--accent-deep)}

.end-num{
  position:absolute;right:clamp(20px,4vw,56px);top:clamp(92px,13vh,136px);
  font-family:var(--mono);font-size:12px;letter-spacing:.24em;color:#8A8D92;
}

.end-body{
  flex:1 1 0;
  display:flex;flex-direction:column;justify-content:center;
  gap:clamp(26px,4.5vh,44px);
}

.end-word{
  margin:0;
  font-family:var(--mono);font-weight:700;
  font-size:clamp(60px,12vw,176px);
  line-height:.86;letter-spacing:-.03em;
  color:var(--paper-ink);
}
.end-word span{color:var(--accent-deep)}

.end-copy{max-width:840px}
.end-copy h3{
  margin:0 0 14px;
  font-size:clamp(22px,2.5vw,34px);font-weight:900;
  letter-spacing:.06em;line-height:1.5;
}
.end-copy p{
  margin:8px 0 0;color:#55585D;
  font-size:15.5px;line-height:1.95;letter-spacing:.04em;
}
.end-copy .pick{
  color:var(--paper-ink);user-select:all;cursor:text;
  font-family:var(--mono);letter-spacing:.06em;
}
.end-fine{color:#8A8D92 !important;font-size:13.5px !important}

.end-cta{align-self:flex-start;width:min(100%,520px)}
.end-alt{margin:14px 0 0;font-size:13px;color:#8A8D92;letter-spacing:.04em}
.end-alt a{color:#55585D;border-bottom:1px solid #C9CBCE;padding-bottom:1px}
.end-alt a:hover{color:var(--accent-deep);border-bottom-color:var(--accent-deep)}

.foot{
  display:flex;flex-wrap:wrap;justify-content:space-between;gap:8px 24px;
  padding-top:18px;
  border-top:1px solid #C9CBCE;
  font-size:12px;letter-spacing:.08em;color:#6A6D72;
}
.foot span{color:#55585D}
.foot-right{display:flex;flex-wrap:wrap;gap:8px 20px}
.foot-right a{color:#55585D}
.foot-right a:hover{color:var(--accent-deep)}

/* ── 响应式 ───────────────────────────────────────────── */
@media (max-width:1000px){
  .feat-grid{gap:28px}
}
@media (max-width:899px){
  .feat-grid,.feat-two{grid-template-columns:minmax(0,1fr)}
  .feat-grid{gap:30px;margin-top:32px}
  .feat-two{margin-top:44px;padding-top:32px}
  .feat-card h3{margin-top:14px}
  .hero-mark{height:clamp(80px,22vw,150px)}
  .dl-main{font-size:clamp(24px,6vw,30px);letter-spacing:.12em}
}
@media (max-width:820px){
  /* 窄屏先牺牲试用码，QQ 群保留（那是对外联络入口） */
  .hd-code{display:none}
}
@media (max-width:660px){
  .hd-name{font-size:20px}
  .hd-nav{gap:14px}
  .hd-nav a i{display:none}
  .hd-nav a b{font-size:14px;letter-spacing:.06em}
  .hd-qq{padding:8px 11px;min-height:38px;gap:6px;font-size:12.5px}
  .hd-qq-ico{width:18px;height:20px}
  .hd-qq > span{font-size:12px}
  .hd-qq > b{font-size:14px}
  .hd-code > b{font-size:13px}
  .hero{padding-top:clamp(96px,14vh,126px)}
  .hero-strip{font-size:9.5px;letter-spacing:.18em}
  .end-word{font-size:clamp(52px,17vw,96px)}
  .foot{font-size:11px}
}
@media (max-width:520px){
  /* 手机端：字号不再压缩过度，保证「QQ群号」清晰可读 */
  .hd{padding-left:12px;padding-right:12px}
  .hd-qq{padding:7px 9px;min-height:38px;gap:5px}
  .hd-qq > span{font-size:13px;letter-spacing:0}
  .hd-qq > b{font-size:13.5px}
  .hd-qq-ico{width:17px;height:19px}
  .hd-name{font-size:19px}
  .hd-mark{width:8px;height:8px}
}
@media (max-width:380px){
  /* 极窄屏：只轻微收一档，文字仍清晰 */
  .hd{padding-left:10px;padding-right:10px}
  .hd-qq{padding:6px 8px;gap:4px}
  .hd-qq > span{font-size:12px}
  .hd-qq > b{font-size:12.5px}
  .hd-qq-ico{width:16px;height:18px}
  .hd-name{font-size:17px}
}
@media (max-width:420px){
  .hd-nav{display:none}
  .hero-badge{letter-spacing:.06em;font-size:11.5px}
  .dl-btn{gap:14px;padding:14px 18px}
}