/* レイアウト：左端にそろえた大きな文字と、ロゴ由来の紺と赤い点だけで組む。外部フォントは読み込まない。 */
:root{
 --ink:#14213D;--acc:#E8432A;--bg:#F3F3F0;--card:#FFFFFF;--mut:#566072;--line:#D9D9D2;--soft:#E8E8E2;
 --safe:#0B7A62;--safe-bg:#DDF1EA;--bad-bg:#FBE3DD;--band:#14213D;--band-ink:#F4F5F7;--band-mut:#B4BDCD;--band-line:#33415F;--todo:#8A5A00;--todo-bg:#FFF3D6;
 --sans:"Hiragino Sans","Hiragino Kaku Gothic ProN","Yu Gothic UI","Yu Gothic","Noto Sans JP","Noto Sans CJK JP",Meiryo,sans-serif;
 --url:"Helvetica Neue",Arial,"Hiragino Sans",sans-serif;
 --mono:ui-monospace,SFMono-Regular,Menlo,Consolas,monospace;
}
@media (prefers-color-scheme:dark){:root:not([data-theme="light"]){
 --ink:#F4F5F7;--acc:#FF5F42;--bg:#0F1A31;--card:#18243F;--mut:#AAB3C4;--line:#2E3B59;--soft:#22304E;
 --safe:#4FD1B0;--safe-bg:#12392F;--bad-bg:#4A1F18;--band:#18243F;--band-ink:#F4F5F7;--band-mut:#AAB3C4;--band-line:#33415F;--todo:#FFCF70;--todo-bg:#3D2F10;color-scheme:dark}}
:root[data-theme="dark"]{
 --ink:#F4F5F7;--acc:#FF5F42;--bg:#0F1A31;--card:#18243F;--mut:#AAB3C4;--line:#2E3B59;--soft:#22304E;
 --safe:#4FD1B0;--safe-bg:#12392F;--bad-bg:#4A1F18;--band:#18243F;--band-ink:#F4F5F7;--band-mut:#AAB3C4;--band-line:#33415F;--todo:#FFCF70;--todo-bg:#3D2F10;color-scheme:dark}

*{box-sizing:border-box}
html{-webkit-text-size-adjust:100%;scroll-behavior:smooth;scroll-padding-top:24px}
body{margin:0;background:var(--bg);color:var(--ink);font:400 16px/1.9 var(--sans);letter-spacing:.02em;overflow-x:hidden}
a{color:inherit;text-underline-offset:.25em;text-decoration-thickness:1px}
a:hover{color:var(--acc)}
button{font:inherit;color:inherit;letter-spacing:inherit}
:focus-visible{outline:3px solid var(--acc);outline-offset:3px;border-radius:2px}
h1,h2,h3,p,ol,ul,dl,dd{margin:0}
ol,ul{padding:0;list-style:none}
.wrap{max-width:1120px;margin:auto;padding-left:max(24px,env(safe-area-inset-left,0px));padding-right:max(24px,env(safe-area-inset-right,0px))}
.skip{position:fixed;left:16px;top:-80px;background:var(--card);padding:8px 16px;z-index:50}
.skip:focus{top:12px}

/* ロゴ */
.gl{display:block;width:100%;height:auto;overflow:visible;user-select:none;-webkit-user-select:none}
.gl-word,.gl-stem{fill:var(--ink)}
.gl-s{fill:var(--acc)}
.gl-stem,.gl-s{transform-box:fill-box;transform-origin:50% 100%}
.gl-hit{fill:transparent;cursor:grab;touch-action:none}
.gl.held .gl-hit{cursor:grabbing}
.gl.play .gl-x{animation:gl-x .9s .15s both}
.gl.play .gl-y{animation:gl-y .9s .15s both}
.gl.play .gl-s{animation:gl-s .9s .15s both}
.gl.play .gl-stem{animation:gl-stem .9s .15s both,gl-flash 1.25s .15s both}
@keyframes gl-x{0%,14%{transform:translateX(var(--dx));animation-timing-function:cubic-bezier(.6,0,.75,.85)}70%,100%{transform:none}}
@keyframes gl-y{0%,14%{transform:translateY(var(--dy));animation-timing-function:cubic-bezier(.08,.75,.3,1)}46%{transform:translateY(-34px);animation-timing-function:cubic-bezier(.6,0,.8,.4)}70%{transform:none;animation-timing-function:ease-out}75%{transform:translateY(5px);animation-timing-function:ease-out}84%{transform:translateY(-6px);animation-timing-function:ease-in}93%,100%{transform:none}}
@keyframes gl-s{0%{transform:none}10%{transform:scale(1.16,.8)}18%{transform:scale(.92,1.1)}64%{transform:scale(.94,1.08)}71%{transform:scale(1.26,.7)}82%{transform:scale(.96,1.06)}92%{transform:scale(1.05,.95)}100%{transform:none}}
@keyframes gl-stem{0%,69%{transform:none}75%{transform:scaleY(.9)}86%{transform:scaleY(1.02)}100%{transform:none}}
@keyframes gl-flash{0%,50%{fill:var(--ink)}51%,66%{fill:var(--acc)}100%{fill:var(--ink)}}

/* ヘッダー・フッター */
.top{display:flex;align-items:center;justify-content:space-between;gap:16px 32px;flex-wrap:wrap;padding-top:22px;padding-bottom:22px}
.brand{display:block;width:172px;text-decoration:none;flex:none}
.brand-text{font-weight:700}
.nav{display:flex;flex-wrap:wrap;gap:4px 22px;font-size:14px}
.nav a{text-decoration:none;padding:4px 0}
.nav a:hover{text-decoration:underline}
.nav a[aria-current]{font-weight:700}
.foot{border-top:1px solid var(--line);margin-top:0}
.foot .wrap{display:flex;flex-wrap:wrap;gap:8px 32px;justify-content:space-between;padding-top:28px;padding-bottom:36px;font-size:13px;color:var(--mut)}
.foot a{color:inherit}

/* トップページ */
.hero{padding-top:44px;padding-bottom:72px}
.hero-logo{max-width:760px;margin-bottom:12px}
.hero-hint{font-size:13px;color:var(--mut);margin-bottom:56px;min-height:1.9em}
.hero h1{font-size:clamp(30px,5.1vw,58px);line-height:1.42;font-weight:700;letter-spacing:.01em;text-wrap:balance;max-width:17em}
.hero .lead{margin-top:28px;max-width:38em;font-size:17px}
.actions{display:flex;flex-wrap:wrap;gap:12px;margin-top:32px}
.btn{display:inline-flex;align-items:center;justify-content:center;gap:8px;border:1.5px solid var(--ink);background:transparent;padding:11px 24px;border-radius:999px;font-weight:600;text-decoration:none;cursor:pointer;transition:transform .12s,background .12s,color .12s;min-height:46px;line-height:1.4;text-align:center}
.btn:hover{background:var(--soft);color:var(--ink)}
.btn:active{transform:scale(.97)}
.btn.primary{background:var(--ink);color:var(--bg)}
.btn.primary:hover{background:var(--acc);border-color:var(--acc);color:#fff}
.btn[disabled]{opacity:.4;cursor:not-allowed}
.btn.small{padding:6px 16px;min-height:38px;font-size:14px;font-weight:500}

.sec{padding-top:72px;padding-bottom:72px;border-top:1px solid var(--line)}
.sec-grid{display:grid;grid-template-columns:minmax(0,1fr) minmax(0,2.6fr);gap:20px 56px}
.sec-grid>*{min-width:0}
.label{font-size:14px;font-weight:700}
.sec h2{font-size:clamp(25px,3.4vw,38px);line-height:1.5;font-weight:700;text-wrap:balance;max-width:20em}
.sec .body{margin-top:20px;max-width:40em}
.sec .body p+p{margin-top:14px}
.vision{font-size:clamp(25px,3.4vw,38px);line-height:1.5;font-weight:700;text-wrap:balance}

.value-list{margin-top:32px;display:grid;gap:0}
.value-list li{padding:18px 0;border-top:1px solid var(--line);max-width:44em}
.value-list li:last-child{border-bottom:1px solid var(--line)}

.policy{margin-top:32px;display:grid;grid-template-columns:repeat(2,minmax(0,1fr));gap:30px 40px}
.policy li{min-width:0;display:grid;grid-template-columns:30px minmax(0,1fr);gap:0 6px}
.policy .n{font-weight:700;color:var(--acc);font-variant-numeric:tabular-nums}
.policy h3{font-size:16px;font-weight:700;line-height:1.7}
.policy p{grid-column:2;font-size:14px;color:var(--mut);margin-top:6px;line-height:1.85}

.try-box{margin-top:32px;background:var(--card);border:1px solid var(--line);border-radius:10px;padding:clamp(18px,3.5vw,34px)}
.try-after{margin-top:24px}

/* 濃紺の帯 */
.band{background:var(--band);color:var(--band-ink);--line:var(--band-line);--mut:var(--band-mut)}
.band a:hover{color:#fff}
.band .sec{border-top:0}
.promise{margin-top:32px;display:grid;grid-template-columns:repeat(2,minmax(0,1fr));gap:0 44px}
.promise li{min-width:0;padding:18px 0;border-top:1px solid var(--band-line)}
.promise strong{display:block;font-size:17px;line-height:1.6}
.promise span{display:block;margin-top:6px;font-size:14px;color:var(--band-mut);line-height:1.85}
.verify{margin-top:36px;border-top:1px solid var(--band-line);padding-top:24px;max-width:44em;font-size:14px;color:var(--band-mut)}
.verify h3{color:var(--band-ink);font-size:16px;margin-bottom:8px}
.verify ol{list-style:decimal;padding-left:1.4em;margin-top:8px}

.info{margin-top:28px;max-width:44em}
.info>div{display:grid;grid-template-columns:8em minmax(0,1fr);gap:8px 16px;padding:14px 0;border-top:1px solid var(--line)}
.info>div:last-child{border-bottom:1px solid var(--line)}
.info dt{font-size:14px;color:var(--mut)}
.todo{display:inline-block;background:var(--todo-bg);color:var(--todo);border:1px dashed currentColor;padding:0 10px;border-radius:4px;font-size:14px}

/* 教材ページ */
.course-head{padding-top:28px;padding-bottom:26px}
.course-head h1{font-size:clamp(34px,6.6vw,72px);line-height:1.28;font-weight:700;letter-spacing:0;text-wrap:balance}
.course-head p{margin-top:14px;max-width:40em}
.safety{margin-top:14px;font-size:13px;color:var(--mut);max-width:48em}
.map-row{display:flex;justify-content:space-between;align-items:center;gap:8px 16px;flex-wrap:wrap;margin-bottom:6px}
.map-wrap{position:relative;padding-top:18px}
.map{display:grid;grid-template-columns:repeat(6,minmax(0,1fr));position:relative;border-top:2px solid var(--ink)}
.map button{appearance:none;background:none;border:0;padding:10px 6px 10px 0;text-align:left;cursor:pointer;font-size:13px;line-height:1.5;color:var(--mut);min-width:0}
.map button b{display:block;font-size:12px;font-weight:700;color:inherit;font-variant-numeric:tabular-nums}
.map button:hover{color:var(--ink)}
.map button[aria-current]{color:var(--ink);font-weight:700}
.map button.done b::after{content:" 済";color:var(--safe)}
.map-dot{position:absolute;top:2px;left:0;width:18px;height:18px;margin-left:0;border-radius:50%;background:var(--acc);transition:left .45s cubic-bezier(.3,1.4,.5,1);pointer-events:none}
.stage{padding-top:34px;padding-bottom:64px}
.stage h2{font-size:clamp(23px,3.2vw,32px);line-height:1.5;font-weight:700}
.stage .goal{margin-top:6px;font-size:16px;max-width:42em}
.playbox{margin-top:24px;background:var(--card);border:1px solid var(--line);border-radius:10px;padding:clamp(16px,3vw,30px);min-width:0}
.rule{margin-top:20px;background:var(--band);color:var(--band-ink);border-radius:10px;padding:clamp(18px,3vw,28px)}
.rule small{display:block;font-size:13px;color:var(--band-mut)}
.rule strong{display:block;margin-top:2px;font-size:clamp(19px,2.6vw,25px);line-height:1.55}
.rule .btn{margin-top:18px;border-color:var(--band-ink);color:var(--band-ink)}
.rule .btn:hover{background:var(--acc);border-color:var(--acc);color:#fff}
.more{margin-top:18px;display:grid;gap:0}
details{border-top:1px solid var(--line)}
details:last-child{border-bottom:1px solid var(--line)}
summary{cursor:pointer;padding:13px 0;font-weight:600;font-size:15px}
details>div{padding:0 0 18px;font-size:15px;max-width:44em}
details p+p,details ul+p,details p+ul{margin-top:10px}
details ul{list-style:disc;padding-left:1.3em}
details li+li{margin-top:6px}
.tag{display:inline-block;font-size:12px;font-weight:700;padding:0 8px;border-radius:4px;margin-right:6px;line-height:1.8}
.tag.fact{background:var(--safe-bg);color:var(--safe)}
.tag.fic{background:var(--soft);color:var(--mut)}
.src{font-size:13px;color:var(--mut)}
.feedback{margin-top:14px;padding:12px 16px;border-radius:8px;background:var(--soft);font-size:15px;line-height:1.8}
.feedback.ok{background:var(--safe-bg)}
.feedback.ng{background:var(--bad-bg)}
.feedback strong{display:block;font-size:17px}
.row{display:flex;flex-wrap:wrap;gap:10px;margin-top:14px;align-items:center}
.count{font-size:13px;color:var(--mut);font-variant-numeric:tabular-nums}
.ask{font-weight:700;font-size:17px;line-height:1.7}
.sub{font-size:14px;color:var(--mut)}

/* 1. URL */
.ug{position:relative}
.ug-bar{margin-top:14px;display:flex;flex-wrap:wrap;align-items:stretch;gap:3px 2px;background:var(--bg);border:1px solid var(--line);border-radius:999px;padding:12px 22px;font-family:var(--url);font-size:clamp(16px,2.4vw,22px);letter-spacing:0;line-height:1.5}
.tok{appearance:none;background:none;border:0;border-radius:6px;padding:8px 3px;cursor:pointer;font:inherit;letter-spacing:0;overflow-wrap:anywhere;text-align:left;min-width:0;transition:background .12s;transform-origin:50% 100%}
.tok:hover,.tok.over{background:var(--soft)}
.tok.no{background:var(--bad-bg)}
.tok.yes{background:var(--safe-bg);font-weight:700}
.tok.bump{animation:bump .3s ease-out}
@keyframes bump{0%{transform:none}30%{transform:scaleY(.86)}70%{transform:scaleY(1.04)}100%{transform:none}}
.ug-field{position:relative;height:96px}
.ug-perch{position:absolute;left:50%;bottom:0;width:14px;height:44px;margin-left:-7px;background:var(--ink);transform-origin:50% 100%}
.ug-perch.flash{animation:perch .5s ease-out}
@keyframes perch{0%,30%{background:var(--acc);transform:scaleY(.86)}70%{transform:scaleY(1.03)}100%{background:var(--ink);transform:none}}
.ug-dot{position:absolute;left:0;top:0;width:44px;height:44px;margin:-22px 0 0 -22px;cursor:grab;touch-action:none;z-index:5;will-change:transform}
.ug-dot i{position:absolute;inset:6px;background:var(--acc);border-radius:50%;display:block;transform-origin:50% 100%}
.ug-dot.held{cursor:grabbing}
.ug-note{min-height:1.9em;font-size:14px;color:var(--mut);text-align:center;margin-top:8px}
.compare{margin-top:14px;display:grid;gap:8px}
.compare div{display:grid;grid-template-columns:8.5em minmax(0,1fr);gap:4px 10px;align-items:baseline}
.compare span{font-size:13px;color:var(--mut)}
.compare code{font-family:var(--url);font-size:clamp(18px,3vw,25px);letter-spacing:0;font-weight:600;overflow-wrap:anywhere}

/* 2. パスワード */
.pw-slot{display:flex;flex-wrap:wrap;gap:4px;min-height:60px;margin-top:14px;padding:8px;border:1.5px dashed var(--line);border-radius:8px;align-items:center}
.pw-empty{color:var(--mut);font-size:14px;padding:0 8px}
.blk{appearance:none;border:1.5px solid var(--ink);background:var(--card);border-radius:6px;padding:7px 12px;cursor:pointer;font:600 16px/1.3 var(--mono);letter-spacing:0;transition:transform .1s}
.blk:hover{transform:translateY(-2px)}
.blk:active{transform:scale(.94)}
.blk[disabled]{opacity:.25;cursor:default;transform:none}
.pw-slot .blk{background:var(--ink);color:var(--bg)}
.blk.fall{animation:fall .8s cubic-bezier(.5,0,.8,.4) both}
@keyframes fall{to{transform:translateY(70px) rotate(var(--rot,14deg));opacity:0}}
.blk.hold{animation:hold .45s ease-out}
@keyframes hold{30%{transform:scale(1.08)}}
.tray{display:flex;flex-wrap:wrap;gap:8px;margin-top:12px}
.looks{margin-top:14px;display:grid;grid-template-columns:auto minmax(0,1fr);gap:10px;align-items:center;font-size:13px;color:var(--mut)}
.looks-bar{height:8px;background:var(--soft);border-radius:4px;overflow:hidden}
.looks-bar i{display:block;height:100%;width:0;background:var(--mut);transition:width .25s}
.scale{position:relative;height:66px;margin-top:20px}
.scale-track{position:absolute;left:0;right:0;top:12px;height:12px;background:var(--soft);border-radius:6px;overflow:hidden}
.scale-fill{position:absolute;left:0;top:0;bottom:0;width:0;background:var(--acc)}
.scale-tick{position:absolute;top:8px;width:1px;height:20px;background:var(--mut)}
.scale-label{position:absolute;top:30px;font-size:12px;color:var(--mut);transform:translateX(-50%);white-space:nowrap}
.scale-label.first{transform:none}
.scale-label.last{transform:translateX(-100%)}
.scale-goal{position:absolute;top:0;width:3px;height:36px;background:var(--ink)}
.readout{display:flex;flex-wrap:wrap;gap:4px 24px;font-size:14px;font-variant-numeric:tabular-nums;margin-top:4px}
.readout b{font-size:20px}

/* 3. ドミノ */
.dom{display:grid;grid-template-columns:repeat(5,minmax(0,1fr));gap:10px;margin-top:16px;padding-bottom:10px}
.acct{min-width:0;border:1.5px solid var(--ink);border-radius:8px;padding:10px;background:var(--card);transform-origin:100% 100%;transition:transform .35s cubic-bezier(.5,0,.7,1.3),opacity .35s,background .2s;display:grid;gap:8px;align-content:start}
.acct h3{font-size:15px;line-height:1.4}
.acct.down{transform:rotate(9deg) translateY(6px);background:var(--bad-bg);border-color:var(--acc)}
.acct.src{border-style:dashed}
.acct small{font-size:12px;line-height:1.5;color:var(--mut);min-height:3em}
.chip{appearance:none;border:0;border-radius:5px;padding:5px 6px;font:700 15px/1.3 var(--mono);cursor:pointer;background:var(--soft);min-height:38px;width:100%}
.chip[data-v="A"]{background:var(--ink);color:var(--bg)}
.chip[disabled],.tfa[disabled]{cursor:default}
.tfa{appearance:none;background:none;border:1px solid var(--line);border-radius:5px;padding:5px 4px;cursor:pointer;font-size:12px;line-height:1.4;min-height:38px;width:100%}
.tfa[aria-pressed="true"]{background:var(--safe-bg);border-color:var(--safe);color:var(--safe);font-weight:700}
.mem{display:flex;gap:8px;align-items:center;font-size:14px;margin-top:8px;flex-wrap:wrap}
.mem i{display:inline-block;width:12px;height:12px;border-radius:50%;background:var(--ink)}

/* 4. 受信箱 */
.msg{margin-top:14px;border:1px solid var(--line);border-radius:12px;background:var(--bg);padding:16px 18px;max-width:560px}
.msg.pop{animation:pop .25s ease-out}
@keyframes pop{from{transform:translateY(10px);opacity:.3}}
.msg-kind{font-size:12px;color:var(--mut)}
.msg-from{font-weight:700;line-height:1.6}
.msg-text{margin-top:8px;font-size:15px;line-height:1.8}
.msg-link{color:var(--acc);text-decoration:underline;overflow-wrap:anywhere;font-family:var(--url);letter-spacing:0}
.choices{display:grid;gap:8px;margin-top:14px;max-width:560px}
.choice{appearance:none;width:100%;text-align:left;border:1.5px solid var(--ink);background:var(--card);padding:10px 16px;border-radius:8px;cursor:pointer;line-height:1.6;font-weight:500;transition:transform .1s,background .1s}
.choice:hover{background:var(--soft)}
.choice:active{transform:scale(.985)}
.choice[disabled]{cursor:default;opacity:.55}
.choice.picked{opacity:1;font-weight:700}

/* 5. その後 */
.leaks{display:grid;grid-template-columns:repeat(3,minmax(0,1fr));gap:8px;margin-top:14px}
.leak{min-width:0;border:1.5px solid var(--acc);background:var(--bad-bg);border-radius:8px;padding:8px 10px;font-size:13px;line-height:1.5;transition:background .25s,border-color .25s}
.leak b{display:block;font-size:14px}
.leak.shut{border-color:var(--safe);background:var(--safe-bg)}
.pressure{height:10px;background:var(--soft);border-radius:5px;margin-top:12px;overflow:hidden}
.pressure i{display:block;height:100%;width:0;background:var(--acc);transition:width .35s}
.help{margin-top:12px;display:grid;gap:0}
.help li{padding:12px 0;border-top:1px solid var(--line)}
.help b{display:block}
.help span{font-size:14px;color:var(--mut)}

/* 持ち帰り */
.rules-list{margin-top:14px;display:grid;gap:0}
.rules-list li{display:grid;grid-template-columns:26px minmax(0,1fr);padding:11px 0;border-top:1px solid var(--line)}
.rules-list b{color:var(--acc);font-variant-numeric:tabular-nums}
.check{display:grid;gap:4px;margin-top:12px}
.check label{display:grid;grid-template-columns:26px minmax(0,1fr);gap:6px;padding:8px 0;cursor:pointer}
.check input{width:20px;height:20px;margin:4px 0 0;accent-color:var(--acc)}

@media (max-width:820px){
 .sec-grid{grid-template-columns:minmax(0,1fr)}
 .sec{padding-top:52px;padding-bottom:52px}
 .policy,.promise{grid-template-columns:minmax(0,1fr)}
 .map{grid-template-columns:repeat(3,minmax(0,1fr));border-top:0}
 .map-wrap{padding-top:0}
 .map-dot{display:none}
 .map button{border-top:2px solid var(--line);padding-top:6px}
 .map button[aria-current]{border-top-color:var(--acc)}
 .dom{grid-template-columns:repeat(2,minmax(0,1fr))}
 .acct small{min-height:0}
 .hero-hint{margin-bottom:36px}
}
@media (max-width:480px){
 .wrap{padding-left:max(16px,env(safe-area-inset-left,0px));padding-right:max(16px,env(safe-area-inset-right,0px))}
 .brand{width:150px}
 .hero{padding-top:20px;padding-bottom:52px}
 .info>div{grid-template-columns:minmax(0,1fr);gap:0}
 .leaks{grid-template-columns:minmax(0,1fr)}
 .compare div{grid-template-columns:minmax(0,1fr)}
 .ug-bar{border-radius:14px;padding:10px 12px}
}
@media (prefers-reduced-motion:reduce){
 html{scroll-behavior:auto}
 *,*::before,*::after{animation-duration:.01ms!important;animation-delay:0s!important;transition-duration:.01ms!important}
}
.policy-h{margin-top:40px}
.verify-note{margin-top:12px}
.sr-live{position:absolute;width:1px;height:1px;overflow:hidden}
.leaks{grid-template-columns:repeat(4,minmax(0,1fr))}
.ug-perch{width:22px;margin-left:-11px}
@media (max-width:820px){.leaks{grid-template-columns:repeat(2,minmax(0,1fr))}}
h1,h2,.vision,.ask,.rule strong{word-break:auto-phrase}
.ug-bar{gap:3px 0}
.tok{padding:8px 1px}
#stage:focus{outline:none}
.playbox p.ask:not(:first-child){margin-top:20px}
.playbox .count+p.ask{margin-top:0}
.pressure+.feedback,.pressure+div{margin-top:0}
.leaks+.sub{margin-top:12px}
.rules-list+p.ask{margin-top:28px}