.idearu-auth{--bg:#fafdff;--surface:#fff;--surface-2:#f4f7fb;--ink:#1c232f;--ink-soft:#5d646f;--ink-faint:#81868f;--line:#e0e3e8;--line-soft:#eceff3;--brand:#1c80ed;--brand-deep:#0f61c3;--brand-ink:#06489c;--brand-soft:#e3f2ff;--brand-soft-2:#bee1ff;--brand-ring:#1c80ed29;--sky-soft:#dbf3ff;--accent-soft:#fff0d9;--bad:#c94d47;--bad-soft:#ffede9;--warn:#dd9c42;--warn-soft:#fff2db;--warn-ink:#804810;--radius:18px;--radius-sm:12px;--shadow-sm:0 1px 2px #3848630d, 0 2px 6px #3848630d;--shadow-md:0 4px 12px #3848630f, 0 14px 40px #38486314;--shadow-lg:0 10px 30px #3848631a, 0 30px 80px #3848631f;--font-jp:var(--font-zen-kaku-gothic-new), "Zen Kaku Gothic New", system-ui, sans-serif;--font-mono:var(--font-space-grotesk), "Space Grotesk", ui-monospace, monospace;font-family:var(--font-jp);background:var(--bg);color:var(--ink);-webkit-font-smoothing:antialiased;letter-spacing:.01em;flex-direction:column;min-height:100vh;line-height:1.75;display:flex}@supports (color:lab(0% 0 0)){.idearu-auth{--bg:lab(99.069% -.443995 -1.43219);--surface-2:lab(97.0882% -.492424 -2.20424);--ink:lab(13.4564% -.335559 -8.74372);--ink-soft:lab(41.9164% -.62336 -7.41783);--ink-faint:lab(55.8614% -.540257 -5.59863);--line:lab(90.1183% -.512093 -2.97118);--line-soft:lab(94.184% -.388354 -2.23089);--brand:lab(52.7889% 3.81473 -63.5174);--brand-deep:lab(41.0838% 7.46854 -58.7517);--brand-ink:lab(31.2835% 8.6164 -51.9869);--brand-soft:lab(94.7551% -3.8442 -11.8568);--brand-soft-2:lab(87.7868% -9.09501 -24.9654);--brand-ring:lab(52.7889% 3.81473 -63.5174/.16);--sky-soft:lab(94.3277% -7.24512 -10.1323);--accent-soft:lab(95.9589% 5.76624 18.6768);--bad:lab(50.2899% 50.1482 30.8912);--bad-soft:lab(95.1092% 8.80593 5.85394);--warn:lab(69.6667% 18.9195 55.3757);--warn-soft:lab(96.0427% 3.07941 17.333);--warn-ink:lab(36.9378% 21.1385 41.1927);--shadow-sm:0 1px 2px lab(30.1382% -.768676 -17.9743/.05), 0 2px 6px lab(30.1382% -.768676 -17.9743/.05);--shadow-md:0 4px 12px lab(30.1382% -.768676 -17.9743/.06), 0 14px 40px lab(30.1382% -.768676 -17.9743/.08);--shadow-lg:0 10px 30px lab(30.1382% -.768676 -17.9743/.1), 0 30px 80px lab(30.1382% -.768676 -17.9743/.12)}}.idearu-auth *{box-sizing:border-box}.idearu-auth h1,.idearu-auth h2,.idearu-auth h3,.idearu-auth h4{letter-spacing:.005em;margin:0;font-weight:900;line-height:1.34}.idearu-auth p{margin:0}.idearu-auth a{color:inherit;text-decoration:none}.idearu-auth .wrap{width:min(100% - 48px,460px);margin-inline:auto}.idearu-auth .beta-banner{background:var(--warn-soft);color:var(--warn-ink);border-bottom:1px solid #e9d5b3;border-bottom:1px solid lab(86.1861% 3.56337 19.3888);padding:9px 0;font-size:13px;line-height:1.6}.idearu-auth .beta-banner .wrap{align-items:flex-start;gap:10px;width:min(100% - 48px,1120px);display:flex}.idearu-auth .beta-banner .tag{font-family:var(--font-mono);letter-spacing:.08em;background:var(--warn);color:#fff;border-radius:999px;flex:none;margin-top:1px;padding:2px 9px;font-size:11px;font-weight:600}.idearu-auth .beta-banner strong{color:#713500;color:lab(29.6908% 29.2377 52.4604);font-weight:700}.idearu-auth main{flex:1 0 auto;justify-content:center;align-items:center;padding:56px 0 64px;display:flex;position:relative}.idearu-auth main:before{content:"";z-index:-1;background:radial-gradient(720px 420px at 86% -8%, var(--brand-soft) 0%, transparent 60%), radial-gradient(560px 320px at 4% 4%, var(--sky-soft) 0%, transparent 58%), radial-gradient(520px 280px at 98% 96%, var(--accent-soft) 0%, transparent 60%);position:absolute;inset:0}.idearu-auth .auth-head{text-align:center;margin-bottom:26px}.idearu-auth .auth-head .logo{justify-content:center;align-items:center;display:flex}.idearu-auth .logo-img{mix-blend-mode:multiply;width:auto;height:38px;display:block}.idearu-auth .auth-head .eyebrow{font-family:var(--font-mono);letter-spacing:.14em;text-transform:uppercase;color:var(--brand);align-items:center;gap:8px;margin-top:24px;margin-bottom:8px;font-size:12px;font-weight:600;display:inline-flex}.idearu-auth .auth-head h1{letter-spacing:.01em;font-size:clamp(24px,3.2vw,30px)}.idearu-auth .auth-head .sub{color:var(--ink-soft);margin-top:6px;font-size:14px;font-weight:500}.idearu-auth .panel{background:var(--surface);border:1px solid var(--line);border-radius:var(--radius);box-shadow:var(--shadow-md)}.idearu-auth .form-card{padding:32px 34px 30px}.idearu-auth .form-error{background:var(--bad-soft);color:#993935;color:lab(38.4054% 40.735 25.0489);border-radius:var(--radius-sm);border:1px solid #fed2cb;border:1px solid lab(87.9771% 14.762 9.84361);margin-bottom:20px;padding:12px 14px;font-size:13.5px;font-weight:500}.idearu-auth .field{margin-bottom:20px}.idearu-auth .field>label{align-items:center;gap:8px;margin-bottom:9px;font-size:14px;font-weight:700;display:flex}.idearu-auth .field .hint{color:var(--ink-faint);margin-top:7px;font-size:12px;font-weight:500}.idearu-auth .input{width:100%;font-family:var(--font-jp);color:var(--ink);background:var(--surface);border:1px solid var(--line);border-radius:var(--radius-sm);padding:12px 14px;font-size:15px;line-height:1.7;transition:border-color .15s,box-shadow .15s,background .15s}.idearu-auth .input::placeholder{color:#a0a5ac;color:lab(67.4747% -.459611 -4.49332)}.idearu-auth .input:focus{border-color:var(--brand);background:var(--surface);box-shadow:0 0 0 4px var(--brand-ring);outline:none}.idearu-auth .terms{color:var(--ink-soft);align-items:flex-start;gap:10px;margin-bottom:22px;font-size:13.5px;line-height:1.7;display:flex}.idearu-auth .terms input[type=checkbox]{width:18px;height:18px;accent-color:var(--brand);cursor:pointer;flex:none;margin-top:4px}.idearu-auth .terms a{color:var(--brand-ink);font-weight:600;text-decoration:underline}.idearu-auth .terms a:hover{color:var(--brand-deep)}.idearu-auth .btn{font-family:var(--font-jp);cursor:pointer;white-space:nowrap;border:1px solid #0000;border-radius:12px;justify-content:center;align-items:center;gap:8px;width:100%;padding:13px 22px;font-size:15px;font-weight:700;text-decoration:none;transition:transform .15s,box-shadow .2s,background .2s,border-color .2s,color .2s;display:inline-flex}.idearu-auth .btn:active{transform:translateY(1px)}.idearu-auth .btn-primary{background:var(--brand);color:#fff;box-shadow:0 6px 16px #1a7eeb4d;box-shadow:0 6px 16px lab(52.1987% 3.9939 -63.5047/.3)}.idearu-auth .btn-primary:hover:not([disabled]){background:var(--brand-deep);transform:translateY(-1px);box-shadow:0 10px 24px #1a7eeb61;box-shadow:0 10px 24px lab(52.1987% 3.9939 -63.5047/.38)}.idearu-auth .btn[disabled]{opacity:.5;cursor:not-allowed;box-shadow:none;transform:none}.idearu-auth .btn .arr{font-family:var(--font-mono);transition:transform .2s}.idearu-auth .btn:hover:not([disabled]) .arr{transform:translate(3px)}.idearu-auth .switch{text-align:center;color:var(--ink-soft);margin-top:22px;font-size:13.5px}.idearu-auth .switch a{color:var(--brand-ink);font-weight:700}.idearu-auth .switch a:hover{color:var(--brand-deep)}.idearu-auth footer.site{border-top:1px solid var(--line);background:var(--surface);flex:none;padding:24px 0}.idearu-auth footer.site .wrap{flex-wrap:wrap;justify-content:space-between;align-items:center;gap:16px;width:min(100% - 48px,1120px);display:flex}.idearu-auth footer.site .f-links{color:var(--ink-soft);align-items:center;gap:22px;font-size:13px;display:flex}.idearu-auth footer.site .f-links a:hover{color:var(--brand)}.idearu-auth footer.site .copy{color:var(--ink-faint);font-size:12px;font-family:var(--font-mono)}@media (max-width:560px){.idearu-auth .form-card{padding:24px 20px}.idearu-auth main{padding:36px 0 48px}}