/* whitening — セルフホワイトニング LP / 川田クリニック
   Palette: clean teal/mint + soft pink accent, white base */
:root{
  --teal:#3FB6C9;
  --teal-dark:#2B8FA0;
  --mint:#E8F7F9;
  --pink:#F4889A;
  --pink-soft:#FDEEF1;
  --ink:#2C3A40;
  --gray:#6B7A80;
  --line:#E3ECEE;
  --bg:#FFFFFF;
  --radius:16px;
  --shadow:0 8px 28px rgba(43,143,160,.12);
}
*{margin:0;padding:0;box-sizing:border-box}
html{scroll-behavior:smooth}
body{
  font-family:"Noto Sans JP",-apple-system,BlinkMacSystemFont,"Segoe UI",sans-serif;
  color:var(--ink);
  background:var(--bg);
  line-height:1.8;
  font-size:16px;
  -webkit-font-smoothing:antialiased;
}
img{max-width:100%;height:auto;display:block}
a{color:inherit;text-decoration:none}
.container{max-width:1040px;margin:0 auto;padding:0 20px}
.sp-only{display:none}
.pc-only{display:inline}
.accent{color:var(--pink)}

/* ===== Buttons ===== */
.btn{
  display:inline-flex;align-items:center;justify-content:center;gap:8px;
  font-weight:700;font-size:18px;
  padding:18px 38px;border-radius:999px;
  transition:transform .15s ease,box-shadow .15s ease;
  cursor:pointer;
}
.btn-icon{font-size:20px}
.btn-primary{
  background:linear-gradient(135deg,var(--teal),var(--teal-dark));
  color:#fff;box-shadow:0 10px 24px rgba(63,182,201,.4);
}
.btn-primary:hover{transform:translateY(-2px);box-shadow:0 14px 30px rgba(63,182,201,.5)}
.btn-large{font-size:20px;padding:22px 50px}

/* ===== Sections ===== */
.section{padding:72px 0}
.section-eyebrow{
  text-align:center;color:var(--teal);font-weight:700;
  letter-spacing:.16em;font-size:14px;margin-bottom:8px;
}
.section-title{
  text-align:center;font-family:"Noto Serif JP",serif;
  font-size:30px;font-weight:700;line-height:1.5;margin-bottom:40px;
}

/* ===== First View ===== */
.fv{
  background:linear-gradient(160deg,var(--mint) 0%,#F7FCFD 55%,var(--pink-soft) 100%);
  padding:64px 20px 72px;text-align:center;position:relative;overflow:hidden;
}
.fv-inner{max-width:760px;margin:0 auto;position:relative;z-index:1}
.fv-eyebrow{
  display:inline-block;background:#fff;color:var(--teal-dark);
  font-weight:700;font-size:13px;padding:7px 18px;border-radius:999px;
  box-shadow:var(--shadow);margin-bottom:24px;
}
.fv-headline{
  font-family:"Noto Serif JP",serif;font-size:40px;font-weight:700;
  line-height:1.45;margin-bottom:20px;letter-spacing:.01em;
}
.fv-sub{font-size:17px;color:var(--gray);margin-bottom:32px}
.fv-sub strong{color:var(--ink)}
.fv-cta{margin-bottom:28px}
.fv-cta-note{font-size:13px;color:var(--gray);margin-top:12px}
.fv-pills{list-style:none;display:flex;gap:10px;justify-content:center;flex-wrap:wrap}
.fv-pills li{
  background:#fff;border:1px solid var(--line);border-radius:999px;
  padding:9px 18px;font-size:14px;font-weight:500;box-shadow:0 4px 12px rgba(43,143,160,.06);
}
.fv-hero{margin:34px auto 0;max-width:720px}
.fv-hero img{
  width:100%;height:auto;border-radius:24px;
  box-shadow:0 18px 46px rgba(43,143,160,.22);
}

/* ===== Problem ===== */
.problem{background:#fff}
.problem-list{list-style:none;max-width:620px;margin:0 auto 30px}
.problem-list li{
  display:flex;align-items:flex-start;gap:12px;
  background:var(--mint);border-radius:12px;
  padding:16px 22px;margin-bottom:12px;font-weight:500;
}
.problem-list .check{color:var(--teal);font-weight:900;flex-shrink:0}
.problem-transition{text-align:center;font-size:20px;font-weight:700}
.problem-transition strong{color:var(--pink)}

/* ===== About ===== */
.about{background:linear-gradient(180deg,#F7FCFD,#fff)}
.about-card{
  max-width:780px;margin:0 auto;background:#fff;
  border:1px solid var(--line);border-radius:var(--radius);
  padding:40px 34px;box-shadow:var(--shadow);
}
.about-intro{font-size:17px;margin-bottom:26px}
.about-mechanism{background:var(--mint);border-radius:12px;padding:24px 26px;margin-bottom:24px}
.about-mechanism h3{font-size:18px;margin-bottom:14px;color:var(--teal-dark)}
.about-mechanism ul{list-style:none}
.about-mechanism li{padding:8px 0;font-weight:500;border-bottom:1px dashed var(--line)}
.about-mechanism li:last-child{border-bottom:none}
.about-note{font-size:13px;color:var(--gray);line-height:1.9}

/* ===== Features ===== */
.solution{background:#fff}
.features{display:grid;grid-template-columns:repeat(3,1fr);gap:22px}
.feature-card{
  background:#fff;border:1px solid var(--line);border-radius:var(--radius);
  padding:34px 24px;text-align:center;box-shadow:0 6px 18px rgba(43,143,160,.07);
  transition:transform .15s ease;
}
.feature-card:hover{transform:translateY(-4px)}
.feature-icon{font-size:42px;margin-bottom:14px}
.feature-card h3{font-size:19px;margin-bottom:12px;color:var(--teal-dark)}
.feature-card p{font-size:14.5px;color:var(--gray);text-align:left}

/* ===== Plans ===== */
.plans{background:linear-gradient(180deg,var(--mint),#fff)}
.price-table-wrap{max-width:720px;margin:0 auto 36px}
.price-table{
  width:100%;border-collapse:collapse;background:#fff;
  border-radius:var(--radius);overflow:hidden;box-shadow:var(--shadow);
}
.price-table th,.price-table td{padding:18px 14px;text-align:center;border-bottom:1px solid var(--line)}
.price-table thead th{background:var(--teal);color:#fff;font-size:15px}
.price-table tbody th{background:var(--mint);font-size:16px;color:var(--teal-dark)}
.price-table tbody td{font-size:18px;font-weight:700}
.price-table .row-premium th{background:var(--pink-soft);color:var(--pink)}
.price-tax-note{text-align:right;font-size:12px;color:var(--gray);margin-top:8px}
.plan-detail-note{background:var(--pink-soft);border-radius:10px;padding:12px 16px;font-size:13.5px;margin-top:12px;color:var(--ink)}
.plan-detail-note strong{color:var(--pink)}

.discount-box{
  max-width:620px;margin:0 auto;background:#fff;
  border:2px dashed var(--pink);border-radius:var(--radius);padding:30px 28px;
}
.discount-box h3{text-align:center;color:var(--pink);font-size:19px;margin-bottom:18px}
.discount-list{list-style:none;margin-bottom:18px}
.discount-list li{
  display:flex;justify-content:space-between;align-items:center;
  padding:11px 4px;border-bottom:1px dashed var(--line);
}
.discount-list .d-label{font-weight:500}
.discount-list .d-label small{color:var(--gray);font-size:11px}
.discount-list .d-value{font-weight:700;color:var(--pink);white-space:nowrap}
.discount-result{
  text-align:center;background:var(--pink-soft);border-radius:12px;
  padding:16px;font-size:16px;
}
.discount-result strong{color:var(--pink);font-size:20px}
.discount-note{text-align:center;font-size:12px;color:var(--gray);margin-top:12px}

/* ===== Flow ===== */
.flow{background:#fff}
.flow-steps{display:flex;align-items:stretch;justify-content:center;gap:8px;flex-wrap:wrap}
.flow-step{
  flex:1;min-width:150px;max-width:200px;background:var(--mint);
  border-radius:var(--radius);padding:24px 16px;text-align:center;
}
.flow-step .step-num{
  width:42px;height:42px;line-height:42px;margin:0 auto 12px;
  background:var(--teal);color:#fff;border-radius:50%;font-weight:700;
}
.flow-step h3{font-size:16px;margin-bottom:8px;color:var(--teal-dark)}
.flow-step p{font-size:13.5px;color:var(--gray)}
.flow-step .step-time{margin-top:10px;font-size:12px;color:var(--teal);font-weight:700}
.flow-arrow{display:flex;align-items:center;color:var(--teal);font-size:24px;font-weight:700}

/* ===== Voices ===== */
.voices{background:linear-gradient(180deg,#fff,var(--pink-soft))}
.voice-cards{display:grid;grid-template-columns:repeat(3,1fr);gap:20px;margin-bottom:18px}
.voice-card{
  background:#fff;border:1px solid var(--line);border-radius:var(--radius);
  padding:26px 22px;box-shadow:0 6px 18px rgba(43,143,160,.07);
}
.voice-text{font-size:14.5px;margin-bottom:14px}
.voice-meta{font-size:13px;color:var(--teal-dark);font-weight:700;text-align:right}
.voices-note{text-align:center;font-size:12px;color:var(--gray)}

/* ===== Store ===== */
.store{background:#fff}
.store-card{max-width:680px;margin:0 auto}
.store-table{
  width:100%;border-collapse:collapse;background:#fff;
  border:1px solid var(--line);border-radius:var(--radius);overflow:hidden;
}
.store-table th,.store-table td{padding:16px 18px;text-align:left;border-bottom:1px solid var(--line);font-size:15px}
.store-table th{background:var(--mint);width:30%;color:var(--teal-dark);font-weight:700;white-space:nowrap}
.store-table tr:last-child th,.store-table tr:last-child td{border-bottom:none}

/* ===== FAQ ===== */
.faq{background:linear-gradient(180deg,var(--mint),#fff)}
.faq-list{max-width:760px;margin:0 auto}
.faq-list details{
  background:#fff;border:1px solid var(--line);border-radius:12px;
  margin-bottom:12px;overflow:hidden;
}
.faq-list summary{
  list-style:none;cursor:pointer;padding:18px 52px 18px 22px;
  font-weight:700;position:relative;font-size:15.5px;
}
.faq-list summary::-webkit-details-marker{display:none}
.faq-list summary::before{content:"Q";color:var(--teal);font-weight:900;margin-right:10px}
.faq-list summary::after{
  content:"＋";position:absolute;right:20px;top:50%;transform:translateY(-50%);
  color:var(--teal);font-weight:700;transition:transform .2s;
}
.faq-list details[open] summary::after{content:"−"}
.faq-list details p{padding:0 22px 20px;color:var(--gray);font-size:14.5px}

/* ===== Final CTA ===== */
.final-cta{
  background:linear-gradient(135deg,var(--teal),var(--teal-dark));
  color:#fff;text-align:center;
}
.final-cta-title{font-family:"Noto Serif JP",serif;font-size:30px;margin-bottom:16px;line-height:1.5}
.final-cta-sub{font-size:16px;margin-bottom:30px;opacity:.95}
.final-cta .btn-primary{background:#fff;color:var(--teal-dark);box-shadow:0 12px 28px rgba(0,0,0,.18)}
.final-cta .btn-primary:hover{box-shadow:0 16px 34px rgba(0,0,0,.24)}

/* ===== Footer ===== */
.footer{background:var(--ink);color:#cdd7da;padding:40px 20px;text-align:center}
.footer-name{font-weight:700;color:#fff;margin-bottom:10px;font-size:16px}
.footer-addr{font-size:13px;margin-bottom:14px}
.footer-note{font-size:12px;line-height:1.9;max-width:760px;margin:0 auto 14px;opacity:.8}
.footer-update{font-size:12px;opacity:.7;margin-bottom:8px}
.footer-copy{font-size:12px;opacity:.6}

/* ===== Floating CTA ===== */
.floating-cta{
  position:fixed;right:16px;bottom:16px;z-index:50;
  background:linear-gradient(135deg,var(--pink),#E96B81);color:#fff;
  font-weight:700;font-size:14px;text-align:center;line-height:1.4;
  padding:14px 20px;border-radius:14px;box-shadow:0 10px 26px rgba(244,136,154,.5);
  transition:transform .15s ease;
}
.floating-cta small{font-size:11px;font-weight:500;opacity:.9}
.floating-cta:hover{transform:translateY(-3px)}

/* ===== Responsive ===== */
@media (max-width:768px){
  .sp-only{display:inline}
  .pc-only{display:none}
  .section{padding:52px 0}
  .section-title{font-size:24px;margin-bottom:30px}
  .fv{padding:48px 18px 56px}
  .fv-headline{font-size:30px}
  .fv-sub{font-size:15px}
  .features{grid-template-columns:1fr;gap:16px}
  .feature-card p{text-align:center}
  .voice-cards{grid-template-columns:1fr}
  .flow-steps{flex-direction:column;align-items:stretch}
  .flow-step{max-width:none}
  .flow-arrow{transform:rotate(90deg);justify-content:center;padding:2px 0}
  .price-table th,.price-table td{padding:13px 6px;font-size:14px}
  .price-table tbody td{font-size:15px}
  .btn{font-size:16px;padding:16px 30px}
  .btn-large{font-size:17px;padding:18px 36px}
  .floating-cta{font-size:12px;padding:11px 14px;right:10px;bottom:10px}
  .store-table th{width:34%}
}