:root{color-scheme:light;--ink:#17212e;--muted:#737a84;--blue:#246ef2;--card:#fff;--paper:#fafaf7}
.if3{margin:0;background:var(--paper);color:var(--ink);font-family:-apple-system,BlinkMacSystemFont,"Helvetica Neue","PingFang SC","Hiragino Sans GB","Microsoft YaHei",sans-serif;-webkit-text-size-adjust:100%;text-size-adjust:100%}
.if3 *{box-sizing:border-box}.if3 a{color:inherit;text-decoration:none;-webkit-tap-highlight-color:transparent}.if3 button{font:inherit}.if3 [hidden]{display:none!important}.if3 a:focus-visible,.if3 button:focus-visible{outline:2px solid var(--blue);outline-offset:4px}
.if3-shell{width:100%;max-width:510px;margin:0 auto;position:relative;min-height:100vh;min-height:100svh;padding:calc(12px + env(safe-area-inset-top,0px)) 12px calc(12px + env(safe-area-inset-bottom,0px));background:radial-gradient(ellipse at 98% 27%,#edf4fc80,transparent 55%),linear-gradient(120deg,#fff9,var(--paper));isolation:isolate}
.if3-home .if3-shell{height:100vh;height:100svh;min-height:650px;display:grid;grid-template-rows:48px minmax(0,1fr) 56px;gap:10px}
.if3-header{display:flex;justify-content:space-between;align-items:flex-start;padding:0 8px;z-index:5}.if3-brand{display:flex;flex-direction:column;gap:4px}.if3-brand>span{font-family:Georgia,"Times New Roman",serif;font-size:23px;line-height:1.05;letter-spacing:-.5px}.if3-brand small{font-size:9px;letter-spacing:3px;color:var(--muted)}
.if3-menu-toggle{border:0;padding:6px 0 8px 10px;background:none;width:34px;height:34px;display:flex;flex-direction:column;justify-content:space-between;cursor:pointer}.if3-menu-toggle span{display:block;width:20px;height:1.6px;background:var(--ink);border-radius:1px;transition:transform .2s,opacity .2s}.if3-menu-open .if3-menu-toggle span:first-child{transform:translateY(9px) rotate(45deg)}.if3-menu-open .if3-menu-toggle span:nth-child(2){opacity:0}.if3-menu-open .if3-menu-toggle span:last-child{transform:translateY(-9px) rotate(-45deg)}
.if3-main{display:grid;grid-template-rows:minmax(165px,.63fr) minmax(285px,1fr) 58px;gap:14px;min-height:0}.if3-hero{position:relative;display:flex;flex-direction:column;justify-content:center;isolation:isolate;padding:0 8px;min-width:0;overflow:clip}.if3-hero h1{font-family:"Songti SC","STSong","Noto Serif CJK SC","SimSun",serif;font-size:clamp(28px,7.5vw,36px);line-height:1.4;font-weight:700;letter-spacing:1.2px;margin:0 0 16px;z-index:1}.if3-subtitle{font-family:"Songti SC","STSong","SimSun",serif;font-size:clamp(12px,3.45vw,16px);letter-spacing:.7px;color:#616871;margin:0 0 8px;white-space:nowrap;z-index:1}.if3-world{font-size:6.5px;letter-spacing:2px;margin:0;color:#777e88;white-space:nowrap;z-index:1}.if3-globe{position:absolute;width:310px;height:310px;right:-116px;top:50%;transform:translateY(-48%);z-index:-1;opacity:.28}.if3-orbit-copy{position:absolute;right:4px;top:25%;font-size:6px;letter-spacing:1.2px;line-height:1.85;color:#818892}.if3-orbit-copy i{display:block;width:14px;height:2px;background:var(--blue);margin:12px 0}.if3-orbit-copy p{margin:0;letter-spacing:.5px;font-size:7px}
.if3-grid{display:grid;grid-template-columns:repeat(2,minmax(0,1fr));grid-template-rows:repeat(3,minmax(0,1fr));gap:8px}.if3-card{display:grid;grid-template-columns:39px minmax(0,1fr) 17px;align-items:center;gap:6px;padding:12px 8px 12px 10px;border:1px solid #fff;border-radius:12px;background:linear-gradient(140deg,#fff,#ffffffc9);box-shadow:0 7px 20px #344c6a04;min-width:0;transition:transform .2s,box-shadow .2s}.if3-icon{width:38px;height:43px;color:var(--blue);overflow:visible}.if3-ghost{opacity:.14;transition:opacity .2s}.if3-card-copy{min-width:0;display:flex;flex-direction:column;align-items:flex-start}.if3-number{font-size:11px;line-height:1;color:#b9bec6;margin-bottom:8px}.if3-card h2{font-family:"Songti SC","STSong","SimSun",serif;font-size:clamp(13px,3.58vw,17px);font-weight:700;line-height:1.35;white-space:nowrap;margin:0 0 4px;letter-spacing:-.25px}.if3-en{font-size:6.8px;line-height:1.4;letter-spacing:.7px;color:#6f7783;opacity:.76;white-space:nowrap;transition:opacity .2s}.if3-card p{font-size:9px;line-height:1.5;color:#777e86;margin:8px 0 0;white-space:nowrap;letter-spacing:.2px}.if3-arrow{width:19px;height:21px;border:1px solid #d9dee4;border-radius:50%;display:grid;place-items:center;transition:transform .2s}.if3-arrow svg{width:12px;height:12px}.if3-card:active,.if3-card.if3-pressed{transform:translateY(-2px);box-shadow:0 8px 18px #246ef20a}.if3-card:active .if3-en,.if3-card.if3-pressed .if3-en{opacity:1}.if3-card:active .if3-ghost,.if3-card.if3-pressed .if3-ghost{opacity:.22}.if3-card:active .if3-arrow,.if3-card.if3-pressed .if3-arrow{transform:translateX(2px)}
.if3-ctas{display:grid;grid-template-columns:repeat(2,minmax(0,1fr));gap:8px}.if3-cta{display:grid;grid-template-columns:22px minmax(0,1fr) 10px;align-items:center;gap:7px;padding:10px 10px;border-radius:10px;border:1px solid #58606a;min-width:0;transition:transform .2s}.if3-cta>svg:first-child{width:21px;height:24px}.if3-cta>svg:last-child{width:12px;height:16px}.if3-cta>span{display:flex;flex-direction:column;gap:5px;min-width:0}.if3-cta strong{font-size:clamp(11px,3.08vw,14px);font-weight:600;white-space:nowrap;letter-spacing:-.35px}.if3-cta small{font-size:5.5px;letter-spacing:-.1px;white-space:nowrap;opacity:.72}.if3 .if3-primary{background:var(--blue);border-color:var(--blue);color:white;box-shadow:0 8px 18px #246ef210}.if3-primary small{opacity:.9}.if3-secondary{background:#ffffffa8}.if3-cta:active{transform:translateY(-1px)}
.if3-footer{display:flex;flex-direction:column;justify-content:flex-end;align-items:center;gap:11px;color:#7b828c;padding-bottom:1px}.if3-footer p{display:flex;align-items:center;gap:15px;margin:0;font-size:8px;letter-spacing:1px;white-space:nowrap}.if3-footer i{display:block;width:18px;height:1px;background:#91b7ff}.if3-footer>small{font-size:8px;letter-spacing:5px;text-indent:5px}
.if3-menu{position:absolute;inset:0;padding:calc(84px + env(safe-area-inset-top,0px)) 22px 22px;z-index:4;background:#fafaf7f9;backdrop-filter:blur(12px);overflow:auto}.if3-menu nav{display:flex;flex-direction:column}.if3-menu nav a{display:grid;grid-template-columns:1fr 20px;padding:21px 4px;border-bottom:1px solid #dae1e8;gap:7px}.if3-menu nav a span{font-family:"Songti SC","STSong","SimSun",serif;font-size:21px}.if3-menu nav a small{font-size:9px;letter-spacing:1.5px;color:#8892a0;grid-column:1}.if3-menu nav svg{width:18px;grid-column:2;grid-row:1/3;align-self:center}
.if3-module .if3-shell{display:grid;grid-template-rows:48px 1fr 56px;gap:30px}.if3-module-main{display:flex;flex-direction:column;align-items:flex-start;justify-content:center;padding:40px 12px;min-height:480px}.if3-module-main>.if3-icon{width:70px;height:76px;margin-bottom:26px}.if3-module-en{font-size:10px;letter-spacing:2px;color:#8c96a3}.if3-module h1{font-family:"Songti SC","STSong","SimSun",serif;font-size:29px;margin:10px 0 20px}.if3-module-desc{font-size:16px;color:#646e7b}.if3-pending{margin:36px 0;color:#8c96a3;font-size:13px}.if3-back{display:flex;align-items:center;gap:12px;color:var(--blue)!important;font-size:13px}.if3-back svg{width:13px}
@media(min-width:430px){.if3-shell{padding-left:14px;padding-right:14px}.if3-home .if3-shell{grid-template-rows:52px minmax(0,1fr) 65px;gap:13px}.if3-main{gap:17px;grid-template-rows:minmax(165px,.65fr) minmax(285px,1fr) 64px}.if3-card{grid-template-columns:44px minmax(0,1fr) 19px;gap:7px;padding-left:12px}.if3-icon{width:42px;height:47px}.if3-card p{font-size:10px}.if3-en{font-size:7.2px}.if3-cta small{font-size:6px}.if3-footer p{font-size:9px}}
@media(max-height:760px){.if3-home .if3-shell{grid-template-rows:42px minmax(0,1fr) 42px;gap:7px;padding-top:calc(9px + env(safe-area-inset-top,0px));padding-bottom:calc(9px + env(safe-area-inset-bottom,0px))}.if3-main{grid-template-rows:minmax(140px,.5fr) minmax(255px,1fr) 54px;gap:9px}.if3-hero h1{font-size:27px;margin-bottom:12px}.if3-card{padding-top:8px;padding-bottom:8px}.if3-number{margin-bottom:6px}.if3-card p{margin-top:6px}}
@media(prefers-reduced-motion:reduce){.if3 *{transition:none!important}}

/* 2026-09-11 final calibration: mobile homepage only; geometry/content frozen. */
@media (max-width:767px) {
  .if3-home .if3-card:nth-child(1) .if3-ghost,
  .if3-home .if3-card:nth-child(5) .if3-ghost { opacity:.20; }
  .if3-home .if3-card:nth-child(2) .if3-ghost,
  .if3-home .if3-card:nth-child(4) .if3-ghost,
  .if3-home .if3-card:nth-child(6) .if3-ghost { opacity:.18; }
  .if3-home .if3-card:not(:nth-child(3)):is(:active,.if3-pressed) .if3-ghost { opacity:.22; }
  .if3-home .if3-subtitle { color:#5b626b; }
  .if3-home .if3-world { color:#717882; }
  .if3-home .if3-secondary { border-color:#9aa3af; }
}

/* 2026-09-11 final typography: mobile homepage only. */
@media (max-width:767px) {
  @font-face {
    font-family:"IF Home Serif SC";
    font-style:normal;
    font-weight:700;
    font-display:swap;
    src:url("/if-v3-hub/assets/if3-title-serif-sc-700.woff2") format("woff2");
    unicode-range:U+4E00,U+4E0D,U+4E1A,U+4EA7,U+4F1A,U+5168,U+5382,U+5DE5,U+6280,U+63A5,U+672F,U+673A,U+6C42,U+6E20,U+7403,U+7684,U+770B,U+7B2C,U+89C1,U+8FDE,U+9053,U+91CC,U+94FE,U+9700;
  }
  .if3-home .if3-hero h1,
  .if3-home .if3-card h2 {
    font-family:"STZhongsong","华文中宋","IF Home Serif SC","Songti SC","Noto Serif SC","Source Han Serif SC",serif;
  }
  .if3-home .if3-subtitle {
    font-family:-apple-system,BlinkMacSystemFont,"Helvetica Neue","PingFang SC","Hiragino Sans GB","Microsoft YaHei",sans-serif;
    color:#4e5865;
    line-height:1.4;
    line-height:round(nearest,1.4em,1px);
  }
  .if3-home .if3-card p { color:#505c6b; }
  .if3-home .if3-secondary { border-color:#a5adb8; }
}