/* =============================================================================
   ChessAtlas 下载落地页样式。
   颜色、圆角、按钮结构取自 App 设计令牌（source/app/lib/design/tokens.dart、PRD §14.6）：
   品牌蓝渐变 #64AAF0 → #3E7DBA（底边 #2C6194）、次按钮 #3B3F44 → #33363A（底边 #1E2023）、
   「懂你」青 #3BB79A、金 #E4B750、Atlas 气泡 #1E2C3B、品牌夜空 #1A2633 / #22364A。
   页面只有深色（品牌夜空世界观），断点：560 / 720 / 980 / 1200。
   ============================================================================= */
@font-face{font-family:"Atlas Head";src:url(../fonts/NotoSans-ExtraBold.ttf) format("truetype");font-weight:800;font-style:normal;font-display:swap;
  unicode-range:U+0000-024F,U+0259,U+02BB-02BC,U+02C6,U+02DA,U+02DC,U+1E00-1EFF,U+2000-206F,U+20A0-20CF,U+2100-214F,U+2190-21FF}
@font-face{font-family:"Atlas Head";src:url(../fonts/NotoSansDevanagari-Bold.ttf) format("truetype");font-weight:800;font-style:normal;font-display:swap;
  unicode-range:U+0900-097F,U+1CD0-1CFF,U+200C-200D,U+20B9,U+25CC,U+A830-A839,U+A8E0-A8FF}

:root{
  --sky-0:#070F18;--sky-1:#0B1520;--sky-2:#0F1A26;--navy-a:#1A2633;--navy-b:#22364A;--bubble:#1E2C3B;
  --card-a:#1B2734;--card-b:#16202B;--card-hl:rgba(255,255,255,.07);--line:rgba(255,255,255,.07);--line-2:rgba(255,255,255,.12);
  --ink:#FFFFFF;--ink-2:#BAC3CD;--ink-3:#8C96A1;--ink-4:#5F6A76;
  --pri:#4C92D6;--pri-a:#64AAF0;--pri-b:#3E7DBA;--pri-edge:#2C6194;--pri-ink:#7DB4EA;--pri-soft:rgba(76,146,214,.16);
  --btn2-a:#3B3F44;--btn2-b:#33363A;--btn2-edge:#1E2023;
  --you:#3BB79A;--you-ink:#5ED3B8;--you-soft:rgba(59,183,154,.14);--gold:#E4B750;--gold-soft:rgba(228,183,80,.16);
  --glow:#5FA6F2;--star-hi:#E3F1FF;
  --i1:#4C92D6;--i2:#A9CFF5;--i3:#2C6194;
  --cjk:"PingFang SC","Hiragino Sans GB","Microsoft YaHei";
  --font:-apple-system,BlinkMacSystemFont,"Segoe UI",Roboto,var(--cjk),"Noto Sans","Noto Sans CJK SC",sans-serif;
  --head:"Atlas Head",var(--font);
  --wrap:1200px;--gut:16px;--top-h:64px;
  --ease:cubic-bezier(.2,.8,.2,1);--m:1;
  color-scheme:dark;
}
:lang(zh-Hant-HK){--cjk:"PingFang HK","Microsoft JhengHei","Noto Sans CJK TC"}
:lang(zh-Hant-TW){--cjk:"PingFang TC","Microsoft JhengHei","Noto Sans CJK TC"}
:lang(ja){--cjk:"Hiragino Sans","Hiragino Kaku Gothic ProN","Yu Gothic UI","Meiryo","Noto Sans CJK JP"}
:lang(ko){--cjk:"Apple SD Gothic Neo","Malgun Gothic","Noto Sans CJK KR"}
:lang(hi){--cjk:"Kohinoor Devanagari","Nirmala UI","Noto Sans Devanagari"}
@media (min-width:720px){:root{--gut:24px}}
@media (min-width:1200px){:root{--gut:32px}}
@media (prefers-reduced-motion:reduce){:root{--m:0}}

/* ---------- base ---------- */
*,*::before,*::after{box-sizing:border-box}
html{-webkit-text-size-adjust:100%;text-size-adjust:100%;scroll-behavior:smooth;scroll-padding-top:calc(var(--top-h) + 12px);background:var(--sky-1)}
@media (prefers-reduced-motion:reduce){html{scroll-behavior:auto}}
body{margin:0;background:var(--sky-1);color:var(--ink);font:400 16px/1.6 var(--font);-webkit-font-smoothing:antialiased;-moz-osx-font-smoothing:grayscale;overflow-x:hidden}
h1,h2,h3,p,figure,ol,ul{margin:0;padding:0}
ul,ol{list-style:none}
a{color:inherit;text-decoration:none}
img{display:block;max-width:100%;height:auto}
button{font:inherit;color:inherit;background:none;border:0;padding:0;cursor:pointer}
svg{display:block}
:focus-visible{outline:2px solid var(--pri-a);outline-offset:3px;border-radius:6px}
.wrap{width:100%;max-width:calc(var(--wrap) + var(--gut) * 2);margin:0 auto;padding:0 var(--gut)}
.i{width:20px;height:20px;flex:none;fill:none;stroke:currentColor;stroke-width:2;stroke-linecap:round;stroke-linejoin:round}
.tile{width:28px;height:28px;flex:none}
html:not(.js) .js-only{display:none!important}
.skip{position:absolute;left:12px;top:-60px;z-index:100;padding:10px 16px;border-radius:10px;background:var(--pri);color:#fff;font-weight:700;transition:top .2s}
.skip:focus{top:12px}

/* Atlas 星标（star.py 定稿几何；动效方案 C「北极星呼吸」：进场呼吸 2 次后静止，星体永不旋转） */
.atlas-star{width:24px;height:24px;flex:none;overflow:visible}
.atlas-star .st-main,.atlas-star .st-comp{transform-box:fill-box;transform-origin:50% 50%}
.js .breathe .st-main{animation:breath calc(3.2s) ease-in-out 2 both}
.js .breathe .st-comp{animation:comp calc(3.2s) ease-in-out 2 both}
@keyframes breath{0%,100%{transform:scale(1)}50%{transform:scale(.975)}}
@keyframes comp{0%,100%{opacity:1}50%{opacity:.75}}
.bubble.speaking .st-main{animation:speak .34s ease-in-out infinite alternate}
.bubble.done .st-main{animation:done .9s var(--ease) 1}
@keyframes speak{from{transform:scale(.96)}to{transform:scale(1)}}
@keyframes done{0%{transform:scale(1)}35%{transform:scale(1.05)}100%{transform:scale(1)}}

/* ---------- 下载按钮（chess.com 式半扁平：纵向渐变 + 顶部高光 + 底边 + 投影；按下下沉 2px） ---------- */
.dl-group{display:flex;flex-wrap:wrap;justify-content:center;gap:12px}
.dl{position:relative;display:inline-flex;align-items:center;gap:12px;min-width:200px;height:60px;padding:0 22px 0 18px;border-radius:10px;
  color:#fff;text-align:left;background:linear-gradient(180deg,var(--btn2-a),var(--btn2-b));
  box-shadow:inset 0 1px 0 rgba(255,255,255,.13),0 3px 0 var(--btn2-edge),0 8px 18px rgba(0,0,0,.38);
  transition:transform .08s,box-shadow .08s,filter .15s;-webkit-tap-highlight-color:transparent;user-select:none}
.dl:hover{filter:brightness(1.08)}
.dl:active{transform:translateY(2px);box-shadow:inset 0 1px 0 rgba(255,255,255,.13),0 1px 0 var(--btn2-edge),0 3px 8px rgba(0,0,0,.35)}
.dl.pri{background:linear-gradient(180deg,var(--pri-a),var(--pri-b));
  box-shadow:inset 0 1px 0 rgba(255,255,255,.28),0 3px 0 var(--pri-edge),0 10px 26px rgba(30,90,160,.45)}
.dl.pri:active{box-shadow:inset 0 1px 0 rgba(255,255,255,.28),0 1px 0 var(--pri-edge),0 4px 10px rgba(30,90,160,.4)}
.dl-g{width:26px;height:26px;flex:none;fill:currentColor}
.dl-g-play{width:24px;height:24px}
.dl-g .gp-b{fill:#4C8BF5}.dl-g .gp-g{fill:#34A853}.dl-g .gp-r{fill:#EA4335}.dl-g .gp-y{fill:#FBBC04}
.dl.pri .dl-g path{fill:#fff}
.dl-g .cut{fill:var(--btn2-b)}
.dl.pri .dl-g .cut{fill:var(--pri-b)}
.dl-g-android{color:#7BD88F}
.dl.pri .dl-g-android{color:#fff}
.dl-t{display:flex;flex-direction:column;line-height:1.1;min-width:0}
.dl-t small{font-size:12px;font-weight:500;opacity:.82;white-space:nowrap}
.dl-t b{font:800 19px/1.15 var(--head);letter-spacing:-.01em;white-space:nowrap;margin-top:2px}
.dl.is-off{cursor:not-allowed;filter:saturate(.35);opacity:.62;box-shadow:inset 0 1px 0 rgba(255,255,255,.08),0 3px 0 var(--btn2-edge)}
.dl.is-off:hover{filter:saturate(.35)}
.dl.is-off:active{transform:none}
html[data-os="android"] .dl-play,html[data-os="android"] .dl-apk{order:-1}
html[data-os="android"] .dl-play{order:-2}
@media (max-width:559px){
  .dl-group{display:grid;grid-template-columns:1fr;width:100%;max-width:400px;margin:0 auto}
  .dl{height:58px;min-width:0;justify-content:center}
  .dl-t{flex:0 1 auto}
}
/* 顶栏「下载」用次按钮：首屏的实心主按钮只留给下载按钮组（PRD §14.6 每屏一个实心主按钮） */
.btn-s{display:inline-flex;align-items:center;height:38px;padding:0 16px;border-radius:9px;font-weight:700;font-size:14.5px;white-space:nowrap;
  background:linear-gradient(180deg,var(--btn2-a),var(--btn2-b));box-shadow:inset 0 1px 0 rgba(255,255,255,.13),0 2px 0 var(--btn2-edge),0 4px 10px rgba(0,0,0,.3);transition:transform .08s,box-shadow .08s,filter .15s}
.btn-s:hover{filter:brightness(1.1)}
.btn-s:active{transform:translateY(2px);box-shadow:inset 0 1px 0 rgba(255,255,255,.13),0 0 0 var(--btn2-edge)}

/* ---------- 顶栏 ---------- */
.top{position:fixed;inset:0 0 auto 0;z-index:50;height:var(--top-h);padding-top:env(safe-area-inset-top);transition:background .25s,box-shadow .25s,backdrop-filter .25s}
.top.scrolled{background:rgba(9,17,26,.8);-webkit-backdrop-filter:blur(16px) saturate(150%);backdrop-filter:blur(16px) saturate(150%);box-shadow:0 1px 0 var(--line)}
.top-in{display:flex;align-items:center;gap:10px;height:var(--top-h)}
.logo{display:flex;align-items:center;gap:10px;font:800 18px/1 var(--head);letter-spacing:-.01em;white-space:nowrap;margin-right:auto}
.logo img{width:34px;height:34px;border-radius:22.5%;box-shadow:0 0 0 1px rgba(255,255,255,.1),0 4px 12px rgba(0,0,0,.4)}
.top-nav{display:none;gap:4px;margin-right:6px}
.top-nav a{padding:8px 12px;border-radius:8px;color:var(--ink-2);font-weight:600;font-size:15px;transition:color .15s,background .15s}
.top-nav a:hover{color:#fff;background:rgba(255,255,255,.06)}
@media (min-width:860px){.top-nav{display:flex}}
.lang-menu{position:relative}
.lang-menu summary{display:flex;align-items:center;gap:6px;height:38px;padding:0 10px;border-radius:9px;list-style:none;cursor:pointer;color:var(--ink-2);font-weight:600;font-size:14.5px;transition:background .15s,color .15s}
.lang-menu summary::-webkit-details-marker{display:none}
.lang-menu summary:hover,.lang-menu[open] summary{background:rgba(255,255,255,.07);color:#fff}
.lang-menu summary .i{width:18px;height:18px}
.lang-menu .chev{width:16px;height:16px;transition:transform .2s}
.lang-menu[open] .chev{transform:rotate(180deg)}
@media (max-width:559px){.lang-menu summary span{display:none}.lang-menu summary{padding:0 8px}}
.lang-list{position:absolute;right:0;top:calc(100% + 8px);width:240px;max-height:min(70vh,560px);overflow:auto;padding:6px;border-radius:14px;
  background:rgba(22,32,43,.97);-webkit-backdrop-filter:blur(18px);backdrop-filter:blur(18px);box-shadow:inset 0 1px 0 var(--card-hl),0 0 0 1px var(--line-2),0 18px 40px rgba(0,0,0,.5)}
.lang-list a{display:flex;align-items:center;justify-content:space-between;padding:10px 12px;border-radius:9px;font-size:15px;color:var(--ink-2)}
.lang-list a:hover{background:rgba(255,255,255,.06);color:#fff}
.lang-list a[aria-current]{color:#fff;font-weight:700}
.lang-list .i{width:18px;height:18px;color:var(--pri-ink)}

/* ---------- 首屏：夜空 + 文案 + 舞台（马 · 手机 · 王 · 棋盘星球） ---------- */
.hero{position:relative;isolation:isolate;overflow:hidden;padding-top:calc(var(--top-h) + env(safe-area-inset-top) + clamp(20px,4.5vh,52px));background:var(--sky-0)}
.hero-sky{position:absolute;inset:0;z-index:-1;background:url(../img/sky_wide.webp) 50% 100%/cover no-repeat}
.hero-sky::after{content:"";position:absolute;inset:0;background:radial-gradient(120% 70% at 50% 0%,rgba(7,15,24,.55),transparent 60%)}
.sky-stars{position:absolute;inset:0;width:100%;height:100%}
.sky-stars .cons path{fill:none;stroke:rgba(140,186,240,.3);stroke-width:1.1}
.sky-stars .dots circle{fill:#BFDCF8;filter:drop-shadow(0 0 4px rgba(120,180,250,.9))}
.sky-stars .tw circle{fill:#DCEBFA;opacity:.55}
.js .sky-stars .tw circle{animation:tw 4.6s ease-in-out infinite}
.sky-stars .tw circle:nth-child(3n){animation-delay:-1.6s;animation-duration:5.4s}
.sky-stars .tw circle:nth-child(3n+1){animation-delay:-3.1s;animation-duration:3.9s}
@keyframes tw{0%,100%{opacity:.25}50%{opacity:.9}}
@media (max-width:719px){.sky-stars .cons,.sky-stars .dots circle:nth-child(n+8){opacity:.55}}

.hero-copy{position:relative;z-index:5;text-align:center;display:flex;flex-direction:column;align-items:center}
.pill{display:inline-flex;align-items:center;gap:9px;padding:7px 18px 7px 12px;border-radius:999px;font-weight:700;font-size:14.5px;color:#DCEAF8;
  background:rgba(30,44,59,.6);box-shadow:inset 0 0 0 1px rgba(125,180,234,.42),0 0 24px rgba(76,146,214,.18)}
.pill .atlas-star{width:24px;height:24px}
.hero-title{margin-top:16px;max-width:17em;font:800 clamp(40px,7vw,88px)/1.04 var(--head);letter-spacing:-.025em;text-wrap:balance;
  text-shadow:0 6px 40px rgba(76,146,214,.38)}
:lang(zh-Hans) .hero-title,:lang(zh-Hant-HK) .hero-title,:lang(zh-Hant-TW) .hero-title,:lang(ja) .hero-title,:lang(ko) .hero-title{letter-spacing:.01em;font-size:clamp(44px,7.6vw,96px);line-height:1.08}
:lang(hi) .hero-title{line-height:1.25;letter-spacing:0}
:lang(ja) .hero-title{font-size:clamp(38px,6.2vw,78px)}
.lead{margin-top:16px;max-width:42em;color:#C8D3DF;font-size:clamp(16px,1.5vw,18.5px);line-height:1.65;text-wrap:balance}
:lang(zh-Hans) .lead,:lang(zh-Hant-HK) .lead,:lang(zh-Hant-TW) .lead,:lang(ja) .lead{max-width:36em}
.dl-wrap{position:relative;display:flex;align-items:flex-start;justify-content:center;gap:12px;margin-top:26px;width:100%}
.dl-wrap:focus{outline:none}
.req{margin-top:14px;font-size:13.5px;color:var(--ink-3)}
.apk-hint{margin-top:4px;font-size:13.5px;color:var(--ink-3)}
html:not([data-os="android"]) .apk-hint{display:none}

/* 桌面端扫码浮层 */
.qr-pop{position:relative;display:none}
html[data-os="desktop"] .qr-pop{display:block}
@media (max-width:979px){html[data-os="desktop"] .qr-pop{display:none}}
.qr-pop summary{display:grid;place-items:center;width:60px;height:60px;border-radius:10px;list-style:none;cursor:pointer;color:#DCEAF8;
  background:linear-gradient(180deg,var(--btn2-a),var(--btn2-b));box-shadow:inset 0 1px 0 rgba(255,255,255,.13),0 3px 0 var(--btn2-edge),0 8px 18px rgba(0,0,0,.38)}
.qr-pop summary::-webkit-details-marker{display:none}
.qr-pop summary .i{width:26px;height:26px}
.qr-pop .qr-card{position:absolute;right:0;top:calc(100% + 12px);z-index:20;width:300px}
.qr-card{display:flex;align-items:center;gap:16px;padding:14px;border-radius:16px;text-align:left;
  background:linear-gradient(180deg,#1E2B39,#18222E);box-shadow:inset 0 1px 0 var(--card-hl),0 0 0 1px var(--line-2),0 18px 40px rgba(0,0,0,.45)}
.qr-code{width:112px;height:112px;flex:none;padding:7px;border-radius:10px;background:#fff}
.qr-code path{fill:#0B1520}
.qr-card p{max-width:14em;font-size:13px;line-height:1.55;color:var(--ink-2)}
.qr-card b{display:block;margin-bottom:4px;font-size:15.5px;color:#fff}

.stage{--pw:clamp(214px,20vw,280px);--ph:calc(var(--pw) * 2.235);--vis:clamp(230px,calc(100svh - 560px),calc(var(--ph) * .6));--floor:clamp(112px,11vw,168px);
  --plw:max(calc(100vw + 120px),calc(var(--pw) * 6.4));
  position:relative;z-index:1;height:calc(var(--vis) + var(--floor));margin-top:clamp(28px,4.5vh,52px)}
.planet{position:absolute;left:50%;top:calc(var(--vis) - var(--plw) * .1718);width:var(--plw);max-width:none;transform:translateX(-50%);z-index:3;pointer-events:none;user-select:none}
.hero::after{content:"";position:absolute;left:0;right:0;bottom:0;height:clamp(80px,10vw,140px);z-index:4;background:linear-gradient(180deg,rgba(11,21,32,0),var(--sky-1));pointer-events:none}
.piece{position:absolute;z-index:2;pointer-events:none;user-select:none;filter:drop-shadow(0 0 18px rgba(76,146,214,.22))}
.knight{width:calc(var(--pw) * .86);right:calc(50% + var(--pw) * .34);top:calc(var(--vis) - var(--pw) * .86 * .955 + var(--pw) * .1)}
.king{width:calc(var(--pw) * .96);left:calc(50% + var(--pw) * .3);top:calc(var(--vis) - var(--pw) * .96 * .955 + var(--pw) * .105)}
.rise{position:absolute;left:0;right:0;top:0;width:var(--pw);margin:0 auto;z-index:2}
.trust{position:absolute;left:0;right:0;bottom:calc(var(--floor) * .3);z-index:5;display:flex;flex-wrap:wrap;justify-content:center;gap:10px;padding:0 var(--gut)}
.trust li{display:inline-flex;align-items:center;gap:7px;padding:8px 14px 8px 11px;border-radius:999px;font-size:14px;font-weight:600;color:#DCE6F0;
  background:rgba(9,17,26,.6);-webkit-backdrop-filter:blur(6px);backdrop-filter:blur(6px);box-shadow:inset 0 0 0 1px rgba(125,180,234,.22)}
.trust .i{width:16px;height:16px;color:var(--pri-ink);stroke-width:2.6}
@media (max-width:559px){
  .stage{--pw:min(62vw,250px);--floor:132px;--plw:calc(var(--pw) * 5.6)}
  .trust{gap:6px;bottom:22px}.trust li{font-size:12.5px;padding:6px 11px 6px 9px}
  .knight{right:calc(50% + var(--pw) * .30)}.king{left:calc(50% + var(--pw) * .27)}
}

/* 手机框（截图自带状态栏与灵动岛，只画外框） */
.phone{--r:calc(var(--w,260px) * .155);position:relative;width:var(--w,260px);padding:calc(var(--w,260px) * .032);border-radius:var(--r);
  background:linear-gradient(160deg,#3A4552,#141a21 40%,#0d1116);
  box-shadow:inset 0 0 0 1.5px rgba(255,255,255,.14),inset 0 0 0 4px #05080b,0 30px 70px rgba(0,0,0,.55),0 0 0 1px rgba(0,0,0,.7)}
.phone img{width:100%;border-radius:calc(var(--r) - var(--w,260px) * .032);background:#232528}
.phone-hero{--w:var(--pw)}

.bubble{position:absolute;left:calc(100% + 14px);top:13%;display:flex;align-items:flex-start;gap:10px;width:max-content;padding:13px 16px 13px 12px;
  max-width:300px;border-radius:18px 18px 18px 6px;background:rgba(30,44,59,.94);box-shadow:inset 0 0 0 1px rgba(125,180,234,.32),0 16px 36px rgba(0,0,0,.45),0 0 40px rgba(76,146,214,.18);z-index:4}
.bubble .atlas-star{width:30px;height:30px;margin-top:-2px}
.bubble p{position:relative;text-wrap:balance;font-weight:700;font-size:15.5px;line-height:1.45;color:#E6EEF6}

.bubble .typed{position:absolute;inset:0}
@media (max-width:979px){.bubble{left:auto;right:-26px;top:4%;max-width:min(220px,52vw);border-radius:18px 18px 6px 18px}.bubble p{font-size:14px}}
@media (max-width:559px){.bubble{right:-30px;top:5%;max-width:min(190px,50vw);padding:10px 12px 10px 10px}.bubble .atlas-star{width:24px;height:24px}}

/* 首屏进场：文案依次浮现，手机从地平线升起，Atlas 气泡随后出现 */
.js .hero-copy>*{animation:fadeUp calc(.7s * var(--m) + .01s) var(--ease) both}
.js .hero-copy>:nth-child(2){animation-delay:calc(.07s * var(--m))}
.js .hero-copy>:nth-child(3){animation-delay:calc(.14s * var(--m))}
.js .hero-copy>:nth-child(n+4){animation-delay:calc(.21s * var(--m))}
.js .rise{animation:riseUp calc(1.2s * var(--m) + .01s) var(--ease) calc(.2s * var(--m)) both}
.js .piece{animation:fadeUp calc(1.1s * var(--m) + .01s) var(--ease) calc(.45s * var(--m)) both}
.js .bubble{animation:pop calc(.5s * var(--m) + .01s) cubic-bezier(.3,1.5,.5,1) calc(1.15s * var(--m)) both}
@keyframes fadeUp{from{opacity:0;transform:translateY(calc(16px * var(--m)))}to{opacity:1;transform:none}}
@keyframes riseUp{from{opacity:0;transform:translateY(calc(26% * var(--m)))}to{opacity:1;transform:none}}
@keyframes pop{from{opacity:0;transform:scale(.85) translateY(6px)}to{opacity:1;transform:none}}

/* 中日韩标题只在标点与空格处换行，避免「画一 / 本」这类断词；超长时仍可强制换行 */
:is(:lang(zh-Hans),:lang(zh-Hant-HK),:lang(zh-Hant-TW),:lang(ko)) :is(h1,h2,h3,.lead,.shot b,.callout,.bubble p,.tag,.chip){word-break:keep-all;overflow-wrap:anywhere}
/* 日语没有空格、标点也少：用浏览器的词组换行（Chrome 119+），不支持时按常规换行 */
:lang(ja) :is(h1,h2,h3,.lead,.shot b,.callout,.bubble p){line-break:strict}
@supports (word-break:auto-phrase){:lang(ja) :is(h1,h2,h3,.lead,.shot b,.callout,.bubble p){word-break:auto-phrase}}

/* ---------- 通用分节 ---------- */
.sec{position:relative;padding:clamp(64px,8vw,112px) 0}
.sec-head{max-width:820px;margin:0 auto clamp(36px,5vw,60px);text-align:center}
.eyebrow{display:inline-flex;align-items:center;gap:6px;padding:6px 13px;border-radius:999px;font-size:13.5px;font-weight:700;letter-spacing:.02em;color:var(--pri-ink);background:var(--pri-soft)}
.eyebrow-you{color:var(--you-ink);background:var(--you-soft)}
.sec h2,.cta h2{margin-top:14px;font:800 clamp(30px,4.3vw,52px)/1.14 var(--head);letter-spacing:-.02em;text-wrap:balance}
:lang(zh-Hans) h2,:lang(zh-Hant-HK) h2,:lang(zh-Hant-TW) h2,:lang(ja) h2,:lang(ko) h2{letter-spacing:.01em}
:lang(hi) h2{line-height:1.3;letter-spacing:0}
.js .reveal{opacity:0;transform:translateY(calc(22px * var(--m)));transition:opacity .7s var(--ease),transform .7s var(--ease);transition-delay:calc(var(--d,0) * 90ms * var(--m))}
.js .reveal.in{opacity:1;transform:none}

/* ---------- 两个卖点 ---------- */
.pillars{background:radial-gradient(90% 60% at 50% 0%,rgba(34,54,74,.55),transparent 70%),var(--sky-1)}
.pillar-grid{display:grid;gap:24px}
@media (min-width:980px){.pillar-grid{grid-template-columns:1fr 1fr}}
.pillar{--acc:var(--pri-ink);--acc-soft:var(--pri-soft);--acc-glow:rgba(76,146,214,.34);--pad:clamp(24px,3.2vw,40px);
  position:relative;overflow:hidden;isolation:isolate;display:grid;border-radius:24px;padding:var(--pad) var(--pad) 0;
  background:linear-gradient(180deg,#1A2635,#121B25);box-shadow:inset 0 1px 0 var(--card-hl),0 0 0 1px var(--line),0 24px 60px rgba(0,0,0,.35)}
.pillar::before{content:"";position:absolute;z-index:-1;left:50%;bottom:-30%;width:120%;aspect-ratio:1.6;transform:translateX(-50%);
  background:radial-gradient(closest-side,var(--acc-glow),transparent)}
.pillar-you{--acc:var(--you-ink);--acc-soft:var(--you-soft);--acc-glow:rgba(59,183,154,.28);--i1:#3BB79A;--i2:#A6E8D7;--i3:#17806D}
.tag{display:inline-flex;align-items:center;gap:8px;padding:6px 14px 6px 8px;border-radius:999px;font-weight:800;font-size:14.5px;color:var(--acc);background:var(--acc-soft)}
.tag .atlas-star{width:22px;height:22px}.tag .tile{width:22px;height:22px}
.pillar h3{margin-top:16px;font:800 clamp(23px,2.5vw,31px)/1.22 var(--head);letter-spacing:-.015em;text-wrap:balance}
:lang(zh-Hans) .pillar h3,:lang(zh-Hant-HK) .pillar h3,:lang(zh-Hant-TW) .pillar h3,:lang(ja) .pillar h3,:lang(ko) .pillar h3{letter-spacing:0}
.pillar .body{margin-top:12px;color:var(--ink-2);font-size:16px;line-height:1.7}
.ticks{margin-top:18px;display:grid;gap:11px}
.ticks li{display:flex;gap:11px;align-items:flex-start;font-size:15.5px;line-height:1.5;font-weight:500;color:#E3EAF1}
.ticks .i{width:22px;height:22px;padding:4px;margin-top:-1px;border-radius:50%;color:var(--acc);background:var(--acc-soft);stroke-width:3}
.pillar-visual{position:relative;display:flex;justify-content:center;height:clamp(330px,40vw,430px);margin-top:28px}
.pillar-visual .phone{--w:clamp(236px,24vw,280px);align-self:flex-start}
.callout{position:absolute;top:22%;display:flex;align-items:center;gap:9px;max-width:min(270px,62%);padding:11px 15px 11px 11px;border-radius:14px;
  font-weight:700;font-size:14.5px;line-height:1.4;color:#EAF1F8;background:rgba(30,44,59,.95);
  box-shadow:inset 0 0 0 1px color-mix(in srgb,var(--acc) 45%,transparent),0 14px 34px rgba(0,0,0,.45)}
.callout .atlas-star,.callout .tile{width:26px;height:26px}
.pillar-ai .callout{left:calc(50% - 205px)}
.pillar-you .callout{right:calc(50% - 215px);top:30%}
@media (max-width:559px){.pillar-ai .callout{left:8px}.pillar-you .callout{right:8px}.callout{font-size:13.5px}}
@media (min-width:720px) and (max-width:979px){
  .pillar{grid-template-columns:1.05fr .95fr;gap:24px;padding-bottom:0}
  .pillar-copy{padding-bottom:var(--pad)}
  .pillar-visual{height:auto;min-height:420px;margin-top:0}
  .pillar-visual .phone{position:absolute;top:8px}
  .callout{max-width:300px;width:max-content}
  .pillar-ai .callout{left:-28px;top:44%}.pillar-you .callout{right:auto;left:-28px;top:52%}
}

/* ---------- 三步闭环（星座连线） ---------- */
.loop{background:linear-gradient(180deg,var(--sky-1),#0D1823 50%,var(--sky-1))}
.steps{position:relative;display:grid;gap:clamp(28px,4vw,40px);grid-template-columns:repeat(3,1fr);max-width:1080px;margin:0 auto}
.steps::before{content:"";position:absolute;top:38px;left:calc(100% / 6);right:calc(100% / 6);height:2px;
  background:linear-gradient(90deg,transparent,rgba(94,211,184,.65) 12%,rgba(94,211,184,.65) 88%,transparent);
  -webkit-mask:repeating-linear-gradient(90deg,#000 0 10px,transparent 10px 16px);mask:repeating-linear-gradient(90deg,#000 0 10px,transparent 10px 16px)}
.step{position:relative;text-align:center;--i1:#3BB79A;--i2:#A6E8D7;--i3:#17806D}
.node{position:relative;display:grid;place-items:center;width:78px;height:78px;margin:0 auto;border-radius:50%;
  background:radial-gradient(circle at 50% 35%,#1C3A3A,#10222A);box-shadow:0 0 0 8px var(--sky-1),inset 0 0 0 1px rgba(94,211,184,.5),0 0 36px rgba(59,183,154,.35)}
.node .tile{width:38px;height:38px}
.num{display:block;margin-top:18px;font:800 13px/1 var(--head);letter-spacing:.14em;color:var(--you-ink)}
.step h3{margin-top:8px;font:800 21px/1.3 var(--head)}
.step p{margin:10px auto 0;max-width:22em;color:var(--ink-2);font-size:15.5px;line-height:1.7}
.loop-note{display:flex;gap:12px;align-items:flex-start;max-width:800px;margin:clamp(40px,5vw,56px) auto 0;padding:16px 20px;border-radius:16px;
  font-size:15px;line-height:1.65;color:var(--ink-2);background:rgba(59,183,154,.07);box-shadow:inset 0 0 0 1px rgba(94,211,184,.22)}
.loop-note .i{width:22px;height:22px;margin-top:1px;color:var(--you-ink)}
@media (max-width:719px){
  .steps{grid-template-columns:1fr;gap:30px;padding-left:4px}
  .steps::before{top:38px;bottom:38px;left:42px;right:auto;width:2px;height:auto;
    background:linear-gradient(180deg,rgba(94,211,184,.65),rgba(94,211,184,.65));
    -webkit-mask:repeating-linear-gradient(180deg,#000 0 10px,transparent 10px 16px);mask:repeating-linear-gradient(180deg,#000 0 10px,transparent 10px 16px)}
  .step{display:grid;grid-template-columns:78px 1fr;column-gap:18px;text-align:left}
  .node{grid-row:span 3;margin:0}
  .num{margin-top:6px}.step p{margin:8px 0 0}
}

/* ---------- 功能宫格 ---------- */
.feats{padding-top:clamp(32px,4vw,72px)}
.feat-grid{display:grid;gap:16px;grid-template-columns:repeat(auto-fill,minmax(min(100%,300px),1fr))}
.feat{position:relative;padding:24px;border-radius:18px;background:linear-gradient(180deg,var(--card-a),var(--card-b));
  box-shadow:inset 0 1px 0 var(--card-hl),0 0 0 1px var(--line),0 3px 0 rgba(0,0,0,.28),0 12px 28px rgba(0,0,0,.22);transition:transform .25s var(--ease),box-shadow .25s}
.feat:hover{transform:translateY(-3px);box-shadow:inset 0 1px 0 var(--card-hl),0 0 0 1px rgba(125,180,234,.25),0 3px 0 rgba(0,0,0,.28),0 18px 36px rgba(0,0,0,.3)}
.ib{display:grid;place-items:center;width:56px;height:56px;border-radius:15px;background:var(--pri-soft);box-shadow:inset 0 1px 0 rgba(255,255,255,.06)}
.ib .tile{width:36px;height:36px}
.feat h3{margin-top:16px;font:800 19px/1.3 var(--head)}
.feat p{margin-top:7px;color:var(--ink-2);font-size:15px;line-height:1.65}
@media (max-width:559px){
  .feat{display:grid;grid-template-columns:52px 1fr;column-gap:16px;padding:18px}
  .ib{grid-row:span 2;width:52px;height:52px}.ib .tile{width:32px;height:32px}
  .feat h3{margin-top:2px;font-size:17.5px}.feat p{margin-top:4px;font-size:14.5px}
}

/* ---------- 截图画廊（与商店截图同一套：小标签 + 两行配文 + 真实界面） ---------- */
.gallery{padding-bottom:clamp(56px,7vw,100px);overflow:hidden}
.gal-head{display:flex;align-items:flex-end;justify-content:space-between;gap:20px;margin-bottom:clamp(28px,4vw,44px)}
.gal-head .sec-head{margin:0;text-align:left}
.gal-nav{display:none;gap:10px;flex:none}
@media (min-width:720px){.gal-nav{display:flex}}
.nav-btn{display:grid;place-items:center;width:46px;height:46px;border-radius:50%;color:#fff;background:linear-gradient(180deg,var(--btn2-a),var(--btn2-b));
  box-shadow:inset 0 1px 0 rgba(255,255,255,.13),0 3px 0 var(--btn2-edge),0 6px 14px rgba(0,0,0,.35);transition:opacity .2s,transform .08s}
.nav-btn:active{transform:translateY(2px)}
.nav-btn[disabled]{opacity:.35;cursor:default}
.rail{--side:max(var(--gut),calc((100vw - var(--wrap)) / 2));display:flex;gap:18px;overflow-x:auto;overscroll-behavior-x:contain;scroll-snap-type:x mandatory;
  padding:6px var(--side) 30px;scroll-padding-inline:var(--side);scrollbar-width:none}
.rail::-webkit-scrollbar{display:none}
.rail:focus-visible{outline-offset:-4px}
.shot{--acc:var(--pri-ink);--acc-soft:var(--pri-soft);--glow:rgba(76,146,214,.35);flex:0 0 auto;width:clamp(238px,23vw,282px);height:clamp(470px,44vw,560px);
  display:flex;flex-direction:column;align-items:center;overflow:hidden;scroll-snap-align:start;border-radius:24px;padding:22px 16px 0;text-align:center;
  background:radial-gradient(130% 60% at 50% 0%,var(--glow),transparent 62%),linear-gradient(180deg,#13233A,#0C1622);
  box-shadow:inset 0 1px 0 var(--card-hl),0 0 0 1px var(--line),0 18px 40px rgba(0,0,0,.35)}
.shot.acc-teal{--acc:var(--you-ink);--acc-soft:var(--you-soft);--glow:rgba(59,183,154,.28)}
.shot.acc-gold{--acc:var(--gold);--acc-soft:var(--gold-soft);--glow:rgba(228,183,80,.22)}
.shot figcaption{display:flex;flex-direction:column;align-items:center}
.chip{padding:4px 11px;border-radius:999px;font-size:12px;font-weight:800;color:var(--acc);background:var(--acc-soft)}
.shot b{display:block;margin-top:10px;font:800 21px/1.25 var(--head);letter-spacing:-.01em}
.shot b.l2{margin-top:2px;color:var(--acc)}
.shot .phone{--w:86%;width:86%;margin-top:18px;padding:2.8%;border-radius:30px}
.shot .phone img{border-radius:24px}

/* ---------- 常见问题 ---------- */
.faq-in{max-width:880px}
.qa-list{display:grid;gap:12px}
.qa{border-radius:16px;background:linear-gradient(180deg,var(--card-a),var(--card-b));box-shadow:inset 0 1px 0 var(--card-hl),0 0 0 1px var(--line)}
.qa summary{display:flex;align-items:center;justify-content:space-between;gap:16px;padding:20px 22px;list-style:none;cursor:pointer;font-weight:700;font-size:17px;line-height:1.45}
.qa summary::-webkit-details-marker{display:none}
.qa summary .chev{width:22px;height:22px;color:var(--ink-3);transition:transform .25s var(--ease)}
.qa[open] summary .chev{transform:rotate(180deg);color:var(--pri-ink)}
.qa .a p{padding:0 22px 22px;color:var(--ink-2);font-size:15.5px;line-height:1.8}
@supports (interpolate-size:allow-keywords){
  :root{interpolate-size:allow-keywords}
  .qa::details-content{height:0;overflow:clip;transition:height calc(.3s * var(--m)) var(--ease),content-visibility calc(.3s * var(--m)) allow-discrete}
  .qa[open]::details-content{height:auto}
}

/* ---------- 结尾下载 ---------- */
.cta{position:relative;isolation:isolate;overflow:hidden;padding:clamp(80px,10vw,128px) 0 clamp(150px,17vw,240px);text-align:center;
  background:radial-gradient(70% 55% at 50% 100%,rgba(38,82,130,.55),transparent 70%),linear-gradient(180deg,var(--sky-1),#0A1420)}
.planet-cta{--plw:max(calc(100vw + 120px),1300px);top:auto;bottom:calc(clamp(64px,7vw,110px) - var(--plw) * .2577);z-index:-1;width:var(--plw);opacity:.95}
.cta-in{position:relative;display:flex;flex-direction:column;align-items:center}
.cta-mark{width:clamp(132px,15vw,188px);height:auto;filter:drop-shadow(0 16px 40px rgba(76,146,214,.45))}
.js .cta-mark.in{animation:floaty calc(6s) ease-in-out 1.2s infinite}
@media (prefers-reduced-motion:reduce){.js .cta-mark.in{animation:none}}
@keyframes floaty{0%,100%{transform:translateY(0)}50%{transform:translateY(-8px)}}
.cta h2{margin-top:22px}
.cta .lead{margin-top:12px}
.cta-row{display:flex;align-items:center;justify-content:center;gap:28px;margin-top:30px;width:100%}
.cta-dl{display:flex;flex-direction:column;align-items:center;min-width:0}
.qr-inline{display:none}
@media (min-width:980px){html[data-os="desktop"] .qr-inline{display:flex}}
.apk-meta{display:flex;flex-wrap:wrap;align-items:center;justify-content:center;gap:6px 12px;margin-top:6px;font-size:13px;color:var(--ink-3)}
.apk-meta details summary{cursor:pointer;color:var(--pri-ink)}
.apk-meta code{display:block;margin-top:6px;max-width:min(560px,90vw);overflow-wrap:anywhere;font:12px/1.5 ui-monospace,SFMono-Regular,Menlo,monospace;color:var(--ink-2)}

/* ---------- 页脚 ---------- */
.foot{padding:48px 0 calc(40px + env(safe-area-inset-bottom));background:var(--sky-0);box-shadow:inset 0 1px 0 var(--line)}
.foot-in{display:grid;gap:26px}
.foot-brand{display:flex;flex-wrap:wrap;align-items:center;gap:8px 16px}
.foot-brand .logo{margin:0;font-size:16px}
.foot-brand .logo img{width:30px;height:30px}
.foot-brand p{color:var(--ink-3);font-size:14px}
.foot-links{display:flex;flex-wrap:wrap;gap:8px 22px}
.foot-links a{display:inline-flex;align-items:center;gap:6px;color:var(--ink-2);font-size:14.5px;font-weight:600}
.foot-links a:hover{color:#fff}
.foot-links .i{width:16px;height:16px}
.foot-langs{display:flex;flex-wrap:wrap;gap:6px 16px;padding-top:22px;border-top:1px solid var(--line)}
.foot-langs a{font-size:13.5px;color:var(--ink-3)}
.foot-langs a:hover,.foot-langs a[aria-current]{color:#fff}
.foot-legal{display:grid;gap:6px;font-size:12.5px;line-height:1.65;color:var(--ink-4)}
@media (min-width:860px){.foot-in{grid-template-columns:1fr auto}.foot-links{justify-content:flex-end}.foot-langs,.foot-legal{grid-column:1 / -1}}

@media (prefers-reduced-motion:reduce){
  .js .reveal{transform:none;transition:opacity .3s}
  .js .sky-stars .tw circle,.js .breathe .st-main,.js .breathe .st-comp,.bubble.speaking .st-main,.bubble.done .st-main{animation:none}
  .feat:hover{transform:none}
}