:root{--bg:#f8fafc;--ink:#0f172a;--muted:#475569;--line:#dbe3ee;--brand:#0f766e;--brand2:#f97316;--card:#fff;--soft:#ecfeff}*{box-sizing:border-box}body{margin:0;background:var(--bg);color:var(--ink);font-family:-apple-system,BlinkMacSystemFont,"Hiragino Sans","Yu Gothic",Meiryo,sans-serif;line-height:1.75}a{color:#0f766e;text-decoration:none}a:hover{text-decoration:underline}.wrap{max-width:1120px;margin:auto;padding:0 20px}.nav{background:#fff;border-bottom:1px solid var(--line);position:sticky;top:0;z-index:5}.navin{display:flex;gap:18px;align-items:center;justify-content:space-between;padding:12px 20px}.nav .wrap.navin{padding-left:max(44px,env(safe-area-inset-left));padding-right:20px}.brand{font-weight:900;color:#0f172a;margin-left:0;display:inline-flex;align-items:center;min-height:36px}.links{display:flex;gap:14px;flex-wrap:wrap;font-size:14px}.hero{padding:54px 0 34px;background:linear-gradient(135deg,#ecfeff,#fff7ed)}.badge{display:inline-block;background:#ccfbf1;color:#115e59;border:1px solid #99f6e4;padding:3px 10px;border-radius:999px;font-size:13px;font-weight:700}.h1{font-size:clamp(30px,5vw,56px);line-height:1.12;margin:14px 0}.lead{font-size:clamp(17px,2.2vw,22px);color:#334155;max-width:760px}.cta{display:flex;gap:12px;flex-wrap:wrap;margin-top:24px;margin-bottom:14px}.btn{display:inline-block;padding:12px 18px;border-radius:12px;font-weight:800;border:1px solid var(--brand);background:var(--brand);color:white}.btn.alt{background:white;color:var(--brand)}.grid{display:grid;grid-template-columns:repeat(auto-fit,minmax(240px,1fr));gap:16px}.card{background:var(--card);border:1px solid var(--line);border-radius:18px;padding:18px;box-shadow:0 6px 20px rgba(15,23,42,.04)}.section{padding:34px 0}.kpi{display:grid;grid-template-columns:repeat(auto-fit,minmax(170px,1fr));gap:12px}.kpi b{font-size:28px;display:block}.small{font-size:13px;color:var(--muted)}.muted{color:var(--muted)}.tag{display:inline-block;border:1px solid var(--line);background:#fff;border-radius:999px;padding:2px 9px;margin:2px;font-size:12px;color:#334155}.question{font-size:20px;font-weight:800}.choices{display:grid;gap:10px;margin:16px 0}.choice{display:block;text-align:left;width:100%;padding:12px;border-radius:12px;border:1px solid var(--line);background:#fff;font:inherit;cursor:pointer}.choice:hover{border-color:#0f766e}.answer{display:none;background:#ecfdf5;border:1px solid #86efac;padding:14px;border-radius:14px}.answer.show{display:block}.search{width:100%;padding:14px;border:1px solid var(--line);border-radius:12px;font:inherit}.list{display:grid;gap:12px}.footer{border-top:1px solid var(--line);padding:30px 0;color:#64748b;background:#fff}.toc li{margin:7px 0}.notice{background:#fff7ed;border:1px solid #fed7aa;border-radius:14px;padding:14px}.daily{font-size:32px;font-weight:900;color:#0f766e}.pillrow{display:flex;gap:8px;flex-wrap:wrap}.table{width:100%;border-collapse:collapse;background:#fff}.table th,.table td{border:1px solid var(--line);padding:10px;text-align:left}.table th{background:#f1f5f9}@media(max-width:640px){.links{font-size:13px}.hero{padding-top:30px}.card{padding:15px}}

.breadcrumb{font-size:13px;color:#64748b;margin:14px 0}.breadcrumb a{color:#475569}.related-links{margin-top:20px}.faq details{background:#fff;border:1px solid var(--line);border-radius:12px;padding:12px;margin:10px 0}.updated{font-size:12px;color:#64748b;margin-top:10px}.nav:before{content:"";display:block;height:0}.skip{position:absolute;left:-9999px}.skip:focus{left:12px;top:12px;background:#fff;padding:8px;z-index:10}

.flash-page{background:#071612;color:#fff}.flash-hero{padding:36px 0 18px;background:linear-gradient(135deg,#071612,#132019 58%,#23130c)}.flash-stats{display:grid;grid-template-columns:repeat(4,1fr);gap:8px;margin-top:18px}.flash-stats span{background:rgba(255,255,255,.1);border:1px solid rgba(255,255,255,.18);border-radius:14px;padding:8px;text-align:center}.flash-stats b{display:block;font-size:22px;color:#b7f26d}.flash-stage{padding:16px 20px 40px}.flash-controls{display:flex;gap:8px;flex-wrap:wrap;margin:8px 0 14px}.flip-card{min-height:62vh;border-radius:28px;padding:22px;background:radial-gradient(circle at 20% 0,rgba(183,242,109,.25),transparent 30%),linear-gradient(160deg,#fff7e0,#ffffff);color:#172019;box-shadow:0 24px 80px rgba(0,0,0,.38);border:5px solid rgba(183,242,109,.78);transition:transform .18s,border-color .18s}.flip-card.answered{transform:rotateX(2deg) scale(.99)}.flip-card.right{border-color:#21b26f}.flip-card.wrong{border-color:#ef4e45}.flash-card-top{display:flex;justify-content:space-between;gap:10px;color:#2f7ee6;font-weight:900}.flip-card h2{font-size:clamp(24px,8vw,46px);line-height:1.08;margin:14px 0}.flash-question{font-size:clamp(20px,6vw,34px);line-height:1.32;font-weight:900}.flash-options{display:grid;grid-template-columns:1fr 1fr;gap:12px;margin-top:18px}.flash-options button{border:0;border-radius:20px;padding:22px 10px;min-height:112px;font-size:clamp(22px,7vw,40px);font-weight:1000;color:white;box-shadow:0 14px 32px rgba(0,0,0,.2)}#yesBtn{background:#21b26f}#noBtn{background:#ef4e45}.flash-result{margin-top:18px;border-radius:20px;background:#0c1110;color:#fff;padding:18px;border-left:9px solid #b7f26d}.flash-result strong{font-size:28px;color:#b7f26d}.flash-hint{color:#dbe3ee}@media(max-width:720px){.wrap{padding-left:max(20px,env(safe-area-inset-left));padding-right:max(20px,env(safe-area-inset-right))}.nav .wrap.navin{padding-left:max(36px,env(safe-area-inset-left));padding-right:12px}.brand{margin-left:0}.links{gap:9px;font-size:13px}.flash-stats{grid-template-columns:repeat(2,1fr)}.flash-options button{min-height:98px}.flip-card{border-radius:24px;padding:18px}}

.flip-shell{max-width:760px;margin:0 auto}.flip-progress{display:flex;justify-content:space-between;align-items:center;margin-bottom:12px;color:#475569;font-size:14px}.flip-card{position:relative;min-height:430px;background:linear-gradient(160deg,#fff,#ecfeff);border:1px solid var(--line);border-radius:28px;padding:26px;box-shadow:0 24px 60px rgba(15,23,42,.12);touch-action:pan-y;user-select:none;overflow:hidden}.flip-card:before,.flip-card:after{position:absolute;top:50%;transform:translateY(-50%);font-weight:900;font-size:13px;letter-spacing:.08em;padding:8px 10px;border-radius:999px;opacity:.7}.flip-card:before{content:"← 左";left:14px;background:#fee2e2;color:#991b1b}.flip-card:after{content:"右 →";right:14px;background:#dcfce7;color:#166534}.flip-theme{display:inline-block;background:#ccfbf1;color:#115e59;border-radius:999px;padding:4px 10px;font-size:13px;font-weight:800}.flip-title{font-size:24px;line-height:1.35;margin:18px 0 10px}.flip-question{font-size:clamp(22px,4.5vw,34px);line-height:1.35;font-weight:900;margin:22px 0}.flip-hint{display:grid;grid-template-columns:1fr 1fr;gap:10px;margin-top:22px}.flip-answer{border:2px solid var(--line);border-radius:18px;padding:14px;text-align:center;background:#fff}.flip-answer b{display:block;font-size:18px}.flip-answer.wrong-side{border-color:#fecaca}.flip-answer.right-side{border-color:#bbf7d0}.flip-instruction{text-align:center;color:#475569;margin:14px 0}.flip-result{display:none;margin-top:16px}.flip-result.show{display:block}.flip-controls{display:flex;gap:10px;justify-content:center;flex-wrap:wrap;margin:18px 0}.ghost-btn{border:1px solid var(--line);background:#fff;color:#0f172a;border-radius:12px;padding:11px 14px;font-weight:800;cursor:pointer}.review-box{display:none}.review-box.show{display:block}.share-url{width:100%;padding:12px;border:1px solid var(--line);border-radius:12px;font:inherit}.score-good{color:#166534}.score-bad{color:#991b1b}.swipe-left{animation:swipeLeft .28s ease}.swipe-right{animation:swipeRight .28s ease}@keyframes swipeLeft{to{transform:translateX(-120%) rotate(-10deg);opacity:0}}@keyframes swipeRight{to{transform:translateX(120%) rotate(10deg);opacity:0}}@media(max-width:640px){.flip-card{min-height:470px;padding:22px 18px}.flip-hint{grid-template-columns:1fr}.flip-card:before,.flip-card:after{top:auto;bottom:12px}}

.next-meter{height:12px;background:rgba(255,255,255,.16);border:1px solid rgba(183,242,109,.45);border-radius:999px;overflow:hidden;margin:14px 0 6px}.next-meter span{display:block;height:100%;width:100%;background:linear-gradient(90deg,#b7f26d,#21b26f);border-radius:999px;transition:width .06s linear}.next-countdown{margin:0 0 12px;color:#dbe3ee;font-size:13px;font-weight:800}


/* 2026-05-17: make quiz/flashcard entry points unmistakable in the header */
.links a.nav-action{background:#0f766e;color:#fff;border:1px solid #0f766e;border-radius:999px;padding:6px 11px;font-weight:900;box-shadow:0 4px 14px rgba(15,118,110,.16)}
.links a.nav-action:hover{background:#115e59;text-decoration:none}
.flash-result{padding:12px 14px;margin-top:12px}
.flash-result strong{font-size:clamp(20px,6vw,28px)}
.flash-result p{margin:.25rem 0}
@media(max-width:720px){.navin{align-items:flex-start;flex-wrap:wrap;gap:8px}.links{width:100%;display:flex;flex-wrap:nowrap;overflow-x:auto;padding-bottom:4px;-webkit-overflow-scrolling:touch}.links a{white-space:nowrap}.links a.nav-action{font-size:13px;padding:7px 12px;flex:0 0 auto}.flash-result{position:absolute;left:14px;right:14px;bottom:14px;z-index:2;box-shadow:0 18px 50px rgba(0,0,0,.3)}}


/* 2026-05-17: quiz feedback should overlay the card, not push content below the viewport */
.quiz-card{position:relative;overflow:hidden}
.quiz-result-overlay{display:none;position:absolute;inset:12px;z-index:4;align-items:center;justify-content:center;background:rgba(15,23,42,.76);backdrop-filter:blur(2px);border-radius:22px;padding:12px;box-shadow:0 20px 60px rgba(0,0,0,.28)}
.quiz-result-overlay.show{display:flex}
.quiz-result-panel{width:min(100%,620px);max-height:100%;overflow:hidden;background:#fff;color:#0f172a;border:3px solid #0f766e;border-radius:22px;padding:clamp(12px,3vw,20px);text-align:left;box-shadow:0 16px 50px rgba(0,0,0,.28)}
.quiz-result-panel h2{margin:0 0 6px;font-size:clamp(28px,9vw,54px);line-height:1;text-align:center}
.quiz-result-panel p{margin:4px 0;line-height:1.35}
.quiz-answer-line{font-size:clamp(13px,3.5vw,17px)}
.quiz-rule-line,.quiz-trap-line{font-size:clamp(12px,3.2vw,16px);display:-webkit-box;-webkit-line-clamp:2;-webkit-box-orient:vertical;overflow:hidden}
.quiz-result-panel .next-countdown{text-align:center;color:#475569;margin-top:6px;font-size:12px}
.quiz-choice-controls button:disabled{opacity:.55}
@media(max-width:720px){.quiz-shell{margin-top:-8px}.quiz-card{min-height:min(58vh,430px);padding:18px}.quiz-card .flip-title{font-size:clamp(19px,6vw,26px);margin:12px 0 8px}.quiz-card .flip-question{font-size:clamp(20px,6.2vw,30px);margin:14px 0}.quiz-card .flip-hint{margin-top:14px}.quiz-card .flip-answer{padding:10px}.quiz-result-overlay{inset:10px}.quiz-result-panel{padding:12px}.quiz-result-panel h2{font-size:clamp(32px,13vw,52px)}}


/* 2026-05-17 override: keep quiz feedback inside the visible viewport */
.quiz-result-overlay{position:fixed!important;inset:0!important;z-index:999;align-items:center;justify-content:center;background:rgba(15,23,42,.62);padding:12px;transform:none!important}
.quiz-result-overlay.show{display:flex!important}
.quiz-result-panel{width:min(92vw,620px);max-height:min(70vh,430px);overflow:hidden}
@media(max-width:720px){.quiz-result-overlay{padding:10px}.quiz-result-panel{width:94vw;max-height:62vh}.quiz-result-panel h2{font-size:clamp(30px,12vw,48px)}}


/* 2026-05-17: real swipe support for /flashcards/ */
.flash-page .flip-card{touch-action:pan-y;will-change:transform}
.flash-page .flip-card.dragging{transition:none;cursor:grabbing}
.flash-page .flip-card.swipe-left{animation:flashSwipeLeft .16s ease}
.flash-page .flip-card.swipe-right{animation:flashSwipeRight .16s ease}
@keyframes flashSwipeLeft{to{transform:translateX(-110%) rotate(-8deg);opacity:.35}}
@keyframes flashSwipeRight{to{transform:translateX(110%) rotate(8deg);opacity:.35}}


/* 2026-06-01: PV routing cards for Japan-time and real-estate-sales use cases */
.pv-routing{background:linear-gradient(180deg,rgba(236,254,255,.62),rgba(255,255,255,.2))}
.pv-routing h2{margin:10px 0 6px}
.pv-grid{margin-top:16px}
.pv-card{position:relative;display:block;border-color:#bdebe5;transition:transform .16s ease,box-shadow .16s ease,border-color .16s ease}
.pv-card:hover{transform:translateY(-2px);border-color:#0f766e;box-shadow:0 12px 28px rgba(15,118,110,.14);text-decoration:none}
.pv-card h3{margin:.2rem 0 .35rem;color:#0f172a}
.route-chip{display:inline-flex;margin-top:8px;padding:6px 10px;border-radius:999px;background:#0f766e;color:#fff;font-size:13px;font-weight:900}
.pv-links{background:#fff;border:1px solid var(--line);border-radius:14px;padding:12px 14px}
.pv-links a{font-weight:800}
@media(max-width:720px){.pv-routing{padding-top:28px}.pv-card{padding:16px}.pv-links{font-size:14px;line-height:1.9}}

/* 2026-06-01: YouTube Shorts landing page */
.shorts-hero{background:radial-gradient(circle at 15% 0,rgba(249,115,22,.22),transparent 30%),linear-gradient(135deg,#ecfeff,#fff7ed)}
.notice code{display:block;margin-top:8px;overflow-wrap:anywhere;background:#fff;border:1px solid var(--line);border-radius:10px;padding:8px}
@media(max-width:720px){.shorts-hero .cta .btn{width:100%;text-align:center}}

/* 2026-06-01: emphasize flashcards as the primary thumb-friendly learning route */
.flash-main-btn{font-size:1.05em;box-shadow:0 10px 24px rgba(15,118,110,.22)}
.thumb-note{margin:8px 0 0;color:#334155;font-weight:700}
.flash-question-cta{margin:18px 0;background:linear-gradient(135deg,#ecfeff,#fff7ed);border-color:#99f6e4}
.flash-question-cta h2{margin-top:0}
@media(max-width:720px){.flash-main-btn,.flash-question-cta .btn{width:100%;text-align:center;padding:15px 18px}.thumb-note{font-size:14px}.flash-question-cta{padding:16px}}

/* 2026-06-01: quiz completion and progress improvements */
.quiz-progress-meter{height:12px;border-radius:999px;background:#e2e8f0;overflow:hidden;border:1px solid var(--line);margin:-4px 0 6px}
.quiz-progress-meter span{display:block;height:100%;background:linear-gradient(90deg,#0f766e,#22c55e);border-radius:999px;transition:width .18s ease}
.quiz-progress-copy{margin:0 0 10px;color:#475569;font-size:14px;font-weight:800;text-align:center}
.quiz-done h1{margin-bottom:10px}
.quiz-score-band{display:grid;grid-template-columns:repeat(auto-fit,minmax(140px,1fr));gap:10px;margin:12px 0}
.quiz-score-band span{background:#ecfeff;border:1px solid #99f6e4;border-radius:14px;padding:10px;text-align:center;color:#115e59;font-weight:800}
.quiz-score-band b{display:block;font-size:28px;color:#0f766e}
.quiz-next-routes{display:grid;grid-template-columns:repeat(auto-fit,minmax(180px,1fr));gap:12px;margin:16px 0}
.quiz-next-routes .card{box-shadow:none}
@media(max-width:720px){.quiz-next-routes{grid-template-columns:1fr}.quiz-score-band b{font-size:24px}}

/* 2026-06-01: exam countdown card */
.exam-countdown{padding-top:0}
.countdown-card{display:flex;align-items:center;justify-content:space-between;gap:18px;background:linear-gradient(135deg,#0f172a,#0f766e);color:#fff;border:0}
.countdown-card h2{margin:4px 0 6px;color:#fff}
.countdown-card p{color:#e0f2fe}
#examDays{font-size:1.45em;color:#fde68a}
.countdown-card .btn.alt{background:#fff;color:#0f172a;border-color:#fff}
@media(max-width:720px){.countdown-card{display:block}.countdown-card .cta .btn{width:100%;text-align:center}}

/* 2026-06-01: comparison table pages */
.compare-hero{background:linear-gradient(135deg,#eff6ff,#ecfeff);border-color:#bae6fd}
.compare-table th{white-space:nowrap}
.compare-table td:last-child{font-weight:700;color:#0f766e}
.compare-cards{margin:16px 0 20px}
.compare-cards .card{box-shadow:none;border-color:#bfdbfe}
@media(max-width:720px){.compare-table{font-size:14px}.compare-table th,.compare-table td{padding:9px 8px}}

/* 2026-06-06: turn /today/ into a daily PV loop hub */
.today-loop{padding-top:18px;background:linear-gradient(180deg,#fff7ed,#f8fafc)}
.today-loop-card{display:grid;grid-template-columns:minmax(0,1.1fr) minmax(260px,.9fr);gap:18px;align-items:center;border-color:#fed7aa;background:linear-gradient(135deg,#fff,#fffbeb)}
.today-loop-card h2{margin:10px 0 8px;font-size:clamp(24px,4vw,38px);line-height:1.18}
.today-steps{margin:0;padding:0;list-style:none;display:grid;gap:10px}
.today-steps li{background:#fff;border:1px solid #fed7aa;border-radius:14px;padding:12px}
.today-steps b{display:block;color:#9a3412;font-size:15px}
.today-steps span{display:block;color:#475569;font-size:14px;line-height:1.55}
.today-loop-cta{grid-column:1/-1;margin-top:4px}
.today-route-grid{margin-top:16px}
.today-route-grid .pv-card{background:#fff}
@media(max-width:720px){.today-loop{padding-top:12px}.today-loop-card{grid-template-columns:1fr;padding:16px}.today-loop-cta .btn{width:100%;text-align:center}.today-route-grid{grid-template-columns:1fr}}

/* 2026-06-11: prevent mobile scroll anchoring/focus jumps in flashcards */
.flash-page,.flash-page .flash-app,.flash-page .flash-stage,.flash-page .flip-card{overflow-anchor:none}
.flash-page .flash-options button{touch-action:manipulation;-webkit-tap-highlight-color:transparent}

/* 2026-06-11: stop iOS/WebView right-swipe visual scroll jitter */
.flash-page{overflow-x:hidden}
.flash-page .flip-card{touch-action:none;contain:layout paint}
.flash-page .flip-card.swipe-right{animation:flashSwipeRightNoOverflow .16s ease}
@keyframes flashSwipeRightNoOverflow{to{transform:translateX(36px) rotate(4deg) scale(.98);opacity:.35}}