/* 心電図塾ブックガイド — style.css
   Design: clean medical editorial. White/light base, deep navy + teal, serif display headings. */
:root{
  --navy:#0e2a47;
  --navy-2:#123a5f;
  --teal:#0e7c7b;
  --teal-dark:#0a5f5e;
  --ink:#1c2733;
  --muted:#5b6b7a;
  --line:#dde5ec;
  --bg:#ffffff;
  --bg-soft:#f4f8fa;
  --bg-band:#eef4f7;
  --gold:#b98a2f;
  --pr:#c0392b;
  --radius:14px;
  --serif:"Hiragino Mincho ProN","Hiragino Mincho Pro","Yu Mincho","YuMincho","Noto Serif JP",serif;
  --sans:"Hiragino Kaku Gothic ProN","Hiragino Sans","Yu Gothic","YuGothic","Noto Sans JP",-apple-system,BlinkMacSystemFont,sans-serif;
}
*{box-sizing:border-box;margin:0;padding:0}
html{scroll-behavior:smooth}
body{font-family:var(--sans);color:var(--ink);background:var(--bg);line-height:1.85;font-size:16px;-webkit-font-smoothing:antialiased}
img{max-width:100%;display:block}
a{color:var(--teal-dark);text-decoration:none}
a:hover{text-decoration:underline}
.wrap{max-width:1080px;margin:0 auto;padding:0 20px}

/* header */
.site-header{position:sticky;top:0;z-index:50;background:rgba(255,255,255,.96);backdrop-filter:blur(6px);border-bottom:1px solid var(--line)}
.header-in{display:flex;align-items:center;justify-content:space-between;gap:16px;padding:12px 0}
.brand{display:flex;flex-direction:column;line-height:1.3}
.brand .brand-en{font-family:var(--serif);font-size:11px;letter-spacing:.28em;color:var(--teal);text-transform:uppercase}
.brand .brand-name{font-family:var(--serif);font-size:20px;font-weight:700;color:var(--navy)}
.main-nav{display:flex;gap:22px;font-size:14px}
.main-nav a{color:var(--navy);font-weight:600;white-space:nowrap}
.main-nav a:hover{color:var(--teal);text-decoration:none}

/* hero */
.hero{background:linear-gradient(160deg,var(--navy) 0%,var(--navy-2) 58%,#0d4a4a 130%);color:#fff;padding:64px 0 56px}
.hero .kicker{font-size:12px;letter-spacing:.3em;color:#9fd8d7;text-transform:uppercase;margin-bottom:14px}
.hero h1{font-family:var(--serif);font-size:clamp(30px,5.4vw,46px);line-height:1.35;font-weight:700;margin-bottom:16px}
.hero h1 .accent{color:#7fd1cf}
.hero p.lead{font-size:clamp(15px,2.4vw,18px);color:#d9e6f0;max-width:640px;margin-bottom:22px}
.cred-list{display:flex;flex-wrap:wrap;gap:8px;margin-bottom:26px}
.cred-list span{border:1px solid rgba(255,255,255,.45);border-radius:999px;padding:4px 14px;font-size:13px;color:#eef5fa}
.hero-cta{display:flex;flex-wrap:wrap;gap:12px}
.btn{display:inline-block;border-radius:999px;padding:12px 26px;font-weight:700;font-size:15px}
.btn:hover{text-decoration:none}
.btn-primary{background:var(--teal);color:#fff}
.btn-primary:hover{background:var(--teal-dark)}
.btn-ghost{border:1px solid rgba(255,255,255,.6);color:#fff}
.btn-ghost:hover{border-color:#fff}

/* PR notice */
.pr-notice{border:1.5px solid var(--pr);background:#fdf3f2;border-radius:10px;padding:12px 16px;font-size:13.5px;color:#7c241a;margin:22px 0}
.pr-notice strong{color:var(--pr)}
.pr-badge{display:inline-block;background:var(--pr);color:#fff;font-size:11px;font-weight:700;letter-spacing:.08em;border-radius:4px;padding:2px 8px;vertical-align:middle}
.used-badge{display:inline-block;background:var(--navy);color:#fff;font-size:11px;font-weight:700;letter-spacing:.05em;border-radius:4px;padding:2px 8px}
.criteria-badge{display:inline-block;background:#fff;color:var(--teal-dark);border:1.5px solid var(--teal);font-size:11px;font-weight:700;letter-spacing:.05em;border-radius:4px;padding:1px 8px}

/* sections */
section.block{padding:52px 0 8px}
.sec-head{margin-bottom:26px}
.sec-head .sec-no{font-family:var(--serif);font-size:13px;letter-spacing:.3em;color:var(--teal);text-transform:uppercase}
.sec-head h2{font-family:var(--serif);font-size:clamp(24px,4vw,32px);color:var(--navy);line-height:1.4;margin-top:4px}
.sec-head p{color:var(--muted);margin-top:8px;max-width:680px}
.group-title{display:flex;align-items:baseline;gap:12px;margin:34px 0 16px;border-bottom:2px solid var(--navy);padding-bottom:8px}
.group-title h3{font-family:var(--serif);font-size:21px;color:var(--navy)}
.group-title span{font-size:13px;color:var(--muted)}

/* book cards (index) */
.card-grid{display:grid;grid-template-columns:repeat(auto-fill,minmax(300px,1fr));gap:18px}
.book-card{display:flex;gap:16px;background:var(--bg-soft);border:1px solid var(--line);border-radius:var(--radius);padding:18px;transition:box-shadow .15s ease}
.book-card:hover{box-shadow:0 6px 20px rgba(14,42,71,.10)}
.book-card .cover{flex:0 0 92px}
.book-card .cover img{width:92px;height:auto;border-radius:6px;box-shadow:0 2px 8px rgba(14,42,71,.18);background:#fff}
.book-card .meta{min-width:0}
.book-card h4{font-size:15.5px;line-height:1.5;color:var(--navy);margin:6px 0 4px}
.book-card .publisher{font-size:12.5px;color:var(--muted)}
.book-card .price{font-weight:700;color:var(--navy);font-size:16px}
.book-card .price small{font-weight:400;color:var(--muted);font-size:12px}
.book-card .pitch{font-size:13.5px;color:var(--ink);margin-top:6px;line-height:1.7}
.book-card .more{font-size:13px;font-weight:700;margin-top:8px;display:inline-block}

/* teaser / band */
.band{background:var(--bg-band);border-radius:var(--radius);padding:30px 28px;margin:40px 0 8px}
.band h3{font-family:var(--serif);font-size:22px;color:var(--navy);margin-bottom:8px}
.band p{color:var(--ink);max-width:700px}
.grade-chips{display:flex;flex-wrap:wrap;gap:8px;margin:16px 0 20px}
.grade-chips span{background:#fff;border:1px solid var(--line);border-radius:999px;padding:5px 16px;font-size:13.5px;font-weight:700;color:var(--navy)}
.grade-chips .arrow{border:none;background:none;color:var(--teal);padding:5px 0}

/* about */
.about-box{display:flex;gap:24px;align-items:flex-start;background:var(--bg-soft);border:1px solid var(--line);border-radius:var(--radius);padding:26px}
.about-box .avatar{flex:0 0 84px;width:84px;height:84px;border-radius:50%;background:var(--navy);color:#fff;display:flex;align-items:center;justify-content:center;font-family:var(--serif);font-size:15px;text-align:center;line-height:1.4;padding:8px}
.about-box h3{font-family:var(--serif);color:var(--navy);font-size:20px;margin-bottom:6px}
.about-box p{font-size:14.5px}
.about-box .cred-list span{border-color:#b9cbd9;color:var(--navy)}

/* picks detail */
.pick-detail{display:grid;grid-template-columns:190px 1fr;gap:28px;padding:34px 0;border-bottom:1px solid var(--line)}
.pick-detail .cover img{width:190px;border-radius:8px;box-shadow:0 4px 16px rgba(14,42,71,.16);background:#fff}
.pick-detail .badges{display:flex;gap:8px;flex-wrap:wrap;margin-bottom:8px}
.pick-detail h3{font-family:var(--serif);font-size:clamp(20px,3.4vw,25px);color:var(--navy);line-height:1.45}
.pick-detail .sub{color:var(--muted);font-size:13.5px;margin:4px 0 10px}
.pick-detail .price-line{font-size:18px;font-weight:700;color:var(--navy);margin-bottom:14px}
.pick-detail .price-line small{font-size:12.5px;font-weight:400;color:var(--muted)}
.spec-table{width:100%;border-collapse:collapse;font-size:14.5px;margin:6px 0 14px}
.spec-table th{width:7.5em;text-align:left;vertical-align:top;color:var(--teal-dark);font-weight:700;padding:7px 10px 7px 0;border-bottom:1px solid var(--line);white-space:nowrap}
.spec-table td{padding:7px 0;border-bottom:1px solid var(--line)}
.operator-take{background:var(--bg-band);border-left:4px solid var(--teal);border-radius:0 10px 10px 0;padding:14px 18px;font-size:14.5px;margin:12px 0}
.operator-take .label{font-weight:700;color:var(--navy);font-size:13px;letter-spacing:.06em;display:block;margin-bottom:4px}
.criteria-box{background:#f2f9f6;border:1.5px dashed var(--teal);border-radius:10px;padding:14px 18px;font-size:14.5px;margin:12px 0}
.criteria-box .label{font-weight:700;color:var(--teal-dark);font-size:13px;letter-spacing:.06em;display:block;margin-bottom:4px}
.criteria-box ul{margin-left:1.2em}
.buy-btn{display:inline-block;margin-top:10px;background:#c7d3dd;color:#54687a;border:none;border-radius:999px;padding:12px 28px;font-size:15px;font-weight:700;cursor:not-allowed;font-family:var(--sans)}
.buy-note{font-size:12.5px;color:var(--muted);margin-top:6px}
.price-note{font-size:13px;color:var(--muted);margin-top:18px}

/* kentei roadmap */
.roadmap{display:flex;flex-direction:column;gap:0;margin-top:10px}
.grade-card{background:var(--bg-soft);border:1px solid var(--line);border-radius:var(--radius);padding:24px 26px;position:relative}
.grade-card+.grade-card{margin-top:26px}
.grade-card::before{content:"";position:absolute;left:34px;top:-27px;width:2px;height:26px;background:var(--teal)}
.grade-card:first-child::before{display:none}
.grade-card .grade-head{display:flex;align-items:center;gap:14px;margin-bottom:8px;flex-wrap:wrap}
.grade-badge{background:var(--navy);color:#fff;font-family:var(--serif);font-weight:700;border-radius:8px;padding:4px 16px;font-size:17px}
.grade-badge.meister{background:var(--gold)}
.grade-card h3{font-family:var(--serif);font-size:19px;color:var(--navy)}
.grade-card p,.grade-card li{font-size:14.5px}
.grade-card ul{margin:6px 0 6px 1.25em}
.grade-card .use-books{margin-top:10px;background:#fff;border:1px solid var(--line);border-radius:10px;padding:12px 16px;font-size:14px}
.grade-card .use-books strong{color:var(--teal-dark)}
.flow-steps{display:grid;grid-template-columns:repeat(auto-fit,minmax(210px,1fr));gap:16px;margin-top:8px}
.flow-step{background:var(--bg-soft);border:1px solid var(--line);border-radius:var(--radius);padding:20px}
.flow-step .num{font-family:var(--serif);font-size:26px;color:var(--teal);font-weight:700}
.flow-step h4{color:var(--navy);font-size:16px;margin:4px 0 6px}
.flow-step p{font-size:13.5px;color:var(--ink)}

/* prose pages */
.prose h2{font-family:var(--serif);color:var(--navy);font-size:21px;margin:30px 0 8px}
.prose h2:first-child{margin-top:0}
.prose p,.prose li{font-size:15px}
.prose ul{margin-left:1.3em;margin-bottom:10px}
.page-hero{padding:44px 0 6px}
.page-hero .kicker{font-size:12px;letter-spacing:.3em;color:var(--teal);text-transform:uppercase}
.page-hero h1{font-family:var(--serif);font-size:clamp(27px,5vw,38px);color:var(--navy);line-height:1.4;margin:6px 0 10px}
.page-hero p{color:var(--muted);max-width:700px}

/* footer */
.site-footer{margin-top:64px;background:var(--navy);color:#cfe0ee;padding:40px 0 30px}
.site-footer .foot-brand{font-family:var(--serif);font-size:18px;color:#fff;margin-bottom:6px}
.site-footer p{font-size:13px;color:#9db4c8}
.foot-links{display:flex;flex-wrap:wrap;gap:20px;margin:18px 0;font-size:14px}
.foot-links a{color:#e7f0f7;font-weight:600}
.foot-index{display:flex;flex-wrap:wrap;gap:14px;font-size:13px;margin-bottom:16px}
.foot-index a{color:#9db4c8}
.copyright{border-top:1px solid rgba(255,255,255,.18);padding-top:16px;font-size:12px;color:#8ba3b8}

@media (max-width:720px){
  .main-nav{gap:14px;font-size:13px}
  .brand .brand-name{font-size:17px}
  .pick-detail{grid-template-columns:120px 1fr;gap:18px}
  .pick-detail .cover img{width:120px}
  .about-box{flex-direction:column}
  .hero{padding:44px 0 40px}
  .spec-table th{width:6.2em}
}
@media (max-width:460px){
  .pick-detail{grid-template-columns:1fr}
  .pick-detail .cover img{width:150px}
  .book-card .cover{flex-basis:76px}
  .book-card .cover img{width:76px}
}

/* articles */
.article-card{display:flex;flex-direction:column;gap:6px;background:var(--bg-soft);border:1px solid var(--line);border-radius:var(--radius);padding:22px;transition:box-shadow .15s ease}
.article-card:hover{box-shadow:0 6px 20px rgba(14,42,71,.10)}
.article-card .a-meta{display:flex;gap:8px;align-items:center;flex-wrap:wrap;font-size:12.5px;color:var(--muted)}
.series-badge{display:inline-block;background:var(--teal);color:#fff;font-size:11px;font-weight:700;letter-spacing:.05em;border-radius:4px;padding:2px 8px}
.plan-badge{display:inline-block;background:#fff;color:var(--muted);border:1.5px solid var(--line);font-size:11px;font-weight:700;letter-spacing:.05em;border-radius:4px;padding:1px 8px}
.article-card h3{font-family:var(--serif);font-size:19px;color:var(--navy);line-height:1.5}
.article-card p{font-size:14px;color:var(--ink)}
.article-card .more{font-size:13px;font-weight:700;margin-top:6px}
.article-card.is-planned{opacity:.75}
.article-card.is-planned:hover{box-shadow:none}
.term-grid{display:grid;grid-template-columns:repeat(auto-fill,minmax(300px,1fr));gap:16px;margin-top:6px}
.term-card{background:var(--bg-soft);border:1px solid var(--line);border-radius:var(--radius);padding:18px 20px}
.term-card .term{font-family:var(--serif);font-size:19px;font-weight:700;color:var(--navy);line-height:1.4}
.term-card .reading{font-size:12.5px;color:var(--teal-dark);font-weight:700;letter-spacing:.04em}
.term-card .meaning{font-size:15px;font-weight:700;color:var(--ink);margin:6px 0 4px}
.term-card p{font-size:13.5px;color:var(--ink);line-height:1.75}
.source-line{font-size:13px;color:var(--muted);margin-top:14px}
.update-box{background:#f2f9f6;border:1.5px dashed var(--teal);border-radius:10px;padding:16px 20px;font-size:14.5px;margin:26px 0}
.update-box .label{font-weight:700;color:var(--teal-dark);font-size:13px;letter-spacing:.06em;display:block;margin-bottom:4px}
.disclaimer{font-size:12.5px;color:var(--muted);border-top:1px solid var(--line);padding-top:14px;margin-top:34px}
.toc-box{background:var(--bg-band);border-radius:var(--radius);padding:20px 24px;margin:24px 0}
.toc-box h3{font-family:var(--serif);font-size:16px;color:var(--navy);margin-bottom:8px}
.toc-box ul{margin-left:1.3em;font-size:14.5px}

/* waveforms */
.wave-card{background:var(--bg-soft);border:1px solid var(--line);border-radius:var(--radius);padding:24px 26px;margin-top:22px}
.wave-card .wave-head{display:flex;align-items:baseline;gap:12px;flex-wrap:wrap;margin-bottom:12px}
.wave-card h3{font-family:var(--serif);font-size:21px;color:var(--navy)}
.wave-card .en{font-size:13px;color:var(--teal-dark);font-weight:700;letter-spacing:.05em}
.strip{background:#fff;border:1px solid #ecd9d9;border-radius:10px;padding:10px 12px 4px}
.strip svg{width:100%;height:auto;display:block}
.strip-cap{font-size:12px;color:var(--muted);text-align:right;padding:2px 2px 6px}
.wave-cols{display:grid;grid-template-columns:1fr 1fr;gap:18px;margin-top:14px}
.wave-cols h4{font-size:14px;color:var(--teal-dark);letter-spacing:.05em;margin-bottom:6px}
.wave-cols ul{margin-left:1.2em;font-size:14.5px}
.wave-cols li{margin-bottom:4px}
.next-step{background:#fff;border:1px solid var(--line);border-left:4px solid var(--teal);border-radius:0 10px 10px 0;padding:12px 16px;font-size:14.5px;margin-top:14px}
.next-step .label{font-weight:700;color:var(--navy);font-size:13px;letter-spacing:.06em;display:block;margin-bottom:4px}
.wave-books{font-size:13.5px;color:var(--muted);margin-top:12px}
@media (max-width:720px){.wave-cols{grid-template-columns:1fr}}