/* =========================================================
   Sponsor one-page (WHITE / FRESH)
   - Clean white base
   - Vivid blue & pink accents
   ========================================================= */

:root{
  --bg:#ffffff;
  --panel:#ffffff;
  --text:#0b1220;
  --muted:#475569;
  --line:#e6eef8;

  --blue:#2563eb;
  --pink:#ec4899;
  --purple:#7c3aed;

  --shadow: 0 18px 50px rgba(15, 23, 42, .10);
  --shadow-sm: 0 10px 26px rgba(15, 23, 42, .08);
  --radius: 18px;
  --radius-lg: 22px;

  --grad: linear-gradient(135deg, var(--blue), var(--pink));
  --grad-soft: radial-gradient(1000px 420px at 20% -10%, rgba(37, 99, 235, .18), transparent 60%),
               radial-gradient(900px 420px at 88% -5%, rgba(236, 72, 153, .16), transparent 55%);
}

*{box-sizing:border-box}
html,body{height:100%}
body{
  margin:0;
  font-family: ui-sans-serif, system-ui, -apple-system, "Segoe UI", Roboto, "Hiragino Kaku Gothic ProN", "Noto Sans JP", "Yu Gothic", "Meiryo", sans-serif;
  color:var(--text);
  background: var(--bg);
  line-height:1.6;
}

/* subtle background shapes */
body::before, body::after{
  content:"";
  position:fixed;
  inset:-20vmax;
  pointer-events:none;
  z-index:-1;
}
body::before{
  background:
    radial-gradient(700px 420px at 18% 8%, rgba(37, 99, 235, .14), transparent 60%),
    radial-gradient(760px 460px at 82% 10%, rgba(236, 72, 153, .12), transparent 58%),
    radial-gradient(520px 340px at 60% 92%, rgba(124, 58, 237, .08), transparent 60%);
  filter: blur(0px);
}
body::after{
  background:
    radial-gradient(520px 320px at 10% 70%, rgba(37, 99, 235, .06), transparent 60%),
    radial-gradient(560px 340px at 95% 68%, rgba(236, 72, 153, .06), transparent 60%);
}

a{color:inherit}
img{max-width:100%; height:auto}

.wrap{max-width:1160px; margin:0 auto; padding:0 18px}

.topbar{
  position:sticky; top:0; z-index:50;
  background: rgba(255,255,255,.78);
  backdrop-filter: blur(10px);
  border-bottom: 1px solid rgba(230, 238, 248, .85);
}
.topbar__inner{display:flex; align-items:center; justify-content:space-between; padding:14px 0; gap:14px}
.brand{display:flex; align-items:center; gap:10px; font-weight:800; letter-spacing:.2px}
.logoDot{
  width:12px; height:12px; border-radius:999px;
  background: var(--grad);
  box-shadow: 0 8px 18px rgba(37,99,235,.25);
}
.nav{display:flex; gap:10px; align-items:center; flex-wrap:wrap}
.nav a{font-size:14px; text-decoration:none; color:var(--muted); padding:8px 10px; border-radius:999px}
.nav a:hover{background:#f3f7ff; color:var(--text)}

.hero{
  padding:44px 0 26px;
}
.hero__grid{display:grid; grid-template-columns: 1.2fr .8fr; gap:22px; align-items:start}

.pill{
  display:inline-flex; align-items:center; gap:10px;
  background: #f3f7ff;
  border:1px solid #dfe9ff;
  color:#1e3a8a;
  font-weight:700;
  padding:8px 12px;
  border-radius:999px;
  font-size:13px;
}
.dot{
  width:8px; height:8px; border-radius:999px;
  background: var(--grad);
}

.hero__title{margin:14px 0 10px; font-size:44px; line-height:1.12; letter-spacing:-.4px}
.grad{
  background: var(--grad);
  -webkit-background-clip:text;
  background-clip:text;
  color:transparent;
}
.hero__lead{margin:0; color:var(--muted); font-size:16px; max-width:52ch}

.hero__badges{display:flex; gap:12px; margin:18px 0 16px; flex-wrap:wrap}
.badge{
  background: #ffffff;
  border:1px solid var(--line);
  border-radius: 14px;
  padding:10px 12px;
  box-shadow: 0 10px 20px rgba(15, 23, 42, .05);
}
.badge__k{font-size:12px; color:var(--muted); font-weight:700}
.badge__v{font-size:14px; font-weight:900}

.hero__cta{display:flex; gap:12px; flex-wrap:wrap; align-items:center}

.btn{
  display:inline-flex; align-items:center; justify-content:center;
  gap:10px;
  padding:12px 16px;
  border-radius: 999px;
  border:1px solid transparent;
  text-decoration:none;
  font-weight:900;
  letter-spacing:.2px;
  cursor:pointer;
  transition: transform .15s ease, box-shadow .15s ease, background .15s ease, border-color .15s ease;
  user-select:none;
}
.btn--lg{padding:13px 18px; min-width: 220px}
.btn--primary{
  background: var(--grad);
  color:#ffffff;
  box-shadow: 0 18px 40px rgba(37, 99, 235, .22);
}
.btn--primary:hover{transform: translateY(-1px); box-shadow: 0 22px 52px rgba(37, 99, 235, .28)}
.btn--ghost{
  background:#ffffff;
  border-color: #dbe7ff;
  color:#1e3a8a;
}
.btn--ghost:hover{background:#f3f7ff; transform: translateY(-1px)}
.w100{width:100%}

.hero__note{
  margin-top:14px;
  padding:12px 14px;
  background:#ffffff;
  border: 1px solid var(--line);
  border-radius: 16px;
  color: var(--muted);
}
.hero__note strong{color:var(--text)}

.card{
  background: var(--panel);
  border:1px solid var(--line);
  border-radius: var(--radius-lg);
  padding:18px;
  box-shadow: var(--shadow-sm);
}
.card--glass{
  background: rgba(255,255,255,.86);
  backdrop-filter: blur(10px);
}
.card__title{font-weight:900; margin-bottom:12px}
.checks{margin:0; padding-left: 18px; color: var(--muted)}
.checks li{margin:7px 0}
.mini{margin-top:12px; font-size:13px; color: var(--muted)}

.section{padding: 22px 0 40px}
.section__head h2{margin:0; font-size:26px; letter-spacing:-.2px}
.section__head p{margin:6px 0 0; color:var(--muted)}

.planGrid{
  margin-top:16px;
  display:grid;
  grid-template-columns: repeat(3, 1fr);
  gap:16px;
}
.plan{
  background:#ffffff;
  border:1px solid var(--line);
  border-radius: var(--radius);
  padding:16px 16px 88px;
  position: relative;
  box-shadow: 0 12px 28px rgba(15, 23, 42, .06);
  display:flex;
  flex-direction:column;
  gap:12px;
}
.plan:hover{transform: translateY(-2px); box-shadow: 0 18px 42px rgba(15, 23, 42, .10)}

.plan__top{display:flex; flex-direction:column; gap:8px}
.plan h3{margin:0; font-size:16px; line-height:1.3}
.price{display:flex; align-items:baseline; gap:8px}
.yen{font-size:30px; font-weight:1000}
.sub{
  color:#1e3a8a;
  font-size:12px;
  font-weight:1000;
  background: rgba(99, 102, 241, .12);
  border:1px solid rgba(99, 102, 241, .22);
  padding:4px 10px;
  border-radius:999px;
}

.tag{
  display:inline-flex;
  align-items:center;
  gap:8px;
  font-size:12px;
  font-weight:1000;
  padding:6px 10px;
  border-radius:999px;
  border:1px solid transparent;
  width: fit-content;
}
.tag--hot{background: rgba(37, 99, 235, .10); color:#1e40af; border-color: rgba(37, 99, 235, .22)}
.tag--premium{background: rgba(236, 72, 153, .10); color:#9d174d; border-color: rgba(236, 72, 153, .22)}
.tag--easy{background: rgba(34, 197, 94, .10); color:#166534; border-color: rgba(34, 197, 94, .20)}
.tag--web{background: rgba(124, 58, 237, .10); color:#5b21b6; border-color: rgba(124, 58, 237, .20)}
.tag--neutral{background: rgba(148, 163, 184, .14); color:#334155; border-color: rgba(148, 163, 184, .28)}

.plan__list{margin:0; padding-left:18px; color: var(--muted)}
.plan__list li{margin:6px 0}

.plan__list .li--period{
  list-style:none;
  margin:10px 0 6px -18px;
  padding:8px 10px;
  border-radius:14px;
  border:1px solid rgba(99, 102, 241, .22);
  background: rgba(99, 102, 241, .10);
  color:#0f172a;
  font-weight:1000;
}

/* ボタンをカード最下部に揃える（テキスト量に依存しない固定） */
.plan .js-pick{
  position:absolute;
  left:16px;
  right:16px;
  bottom:16px;
  width:auto;
  margin-top:0 !important;
}

.plan--focus{border-color: rgba(37, 99, 235, .45)}
.plan--premium{border-color: rgba(236, 72, 153, .45)}
.plan--web{border-color: rgba(124, 58, 237, .45)}

/* form */
.formWrap{display:grid; grid-template-columns: 1fr; gap: 14px; margin-top: 16px}
.formGrid{display:grid; grid-template-columns: repeat(2, 1fr); gap: 12px}
.field{display:flex; flex-direction:column; gap:6px}
.label{font-weight:900; font-size:13px}
.req{
  display:inline-block; margin-left:8px; font-size:11px; font-weight:1000;
  color:#b91c1c; background: rgba(239,68,68,.12); border:1px solid rgba(239,68,68,.25);
  padding:2px 6px; border-radius:999px;
}
.input, select, textarea{
  border:1px solid var(--line);
  border-radius: 14px;
  padding:12px 12px;
  font-size:15px;
  background:#ffffff;
  outline:none;
}
textarea{min-height:110px; resize:vertical}
.input:focus, select:focus, textarea:focus{
  border-color: rgba(37, 99, 235, .55);
  box-shadow: 0 0 0 4px rgba(37, 99, 235, .10);
}

/* validation */
.alert{
  border:1px solid rgba(239,68,68,.35);
  background: rgba(254, 242, 242, .85);
  color:#7f1d1d;
  border-radius: 16px;
  padding:12px 14px;
  font-weight:900;
}
.alert[hidden]{display:none}
.alert.is-show{display:block}
.error{
  border-color: rgba(239,68,68,.65) !important;
  box-shadow: 0 0 0 4px rgba(239,68,68,.12) !important;
}
.errorMsg{color:#b91c1c; font-size:13px; font-weight:900}

.footer{padding: 26px 0 44px; color: var(--muted)}
.footer a{color:#1e3a8a}

@media (max-width: 980px){
  .hero__grid{grid-template-columns: 1fr}
  .hero__title{font-size:38px}
  .planGrid{grid-template-columns: 1fr;}
  .formGrid{grid-template-columns: 1fr;}
  .btn--lg{min-width: 1px; width:auto}
}

/* =========================================================
   Custom tweaks for 2ndthrow-radio sponsor page (2026 update)
   ========================================================= */

/* Utility */
.section__title{margin:0 0 10px;font-size:26px;letter-spacing:.02em}
.muted{color:var(--muted)}

/* Hero layout for the updated HTML structure */
.hero__inner{
  display:grid;
  grid-template-columns: 1.1fr .9fr;
  gap: 22px;
  align-items: stretch;
}
@media (max-width: 980px){
  .hero__inner{grid-template-columns:1fr}
}
.hero__copy .kicker{
  margin:0 0 10px;
  color:var(--muted);
  font-weight:900;
  letter-spacing:.04em;
}
.hero__copy h1{margin:0 0 10px}
.hero__copy .lead{
  margin:0 0 14px;
  color:var(--muted);
  font-size:16px;
  line-height:1.85;
}
.hero__mock img{
  width:100%;
  height:100%;
  max-height: 520px;
  object-fit: cover;
  border-radius: 22px;
  border: 1px solid var(--line);
  box-shadow: var(--shadow-sm);
}

/* Plan cards: keep CTA buttons aligned to the bottom */
.plan ul{
  margin:0;
  padding-left:18px;
  color:var(--muted);
}
.plan .js-pick{margin-top:auto}



/* w100指定でも横幅を崩さない */
.plan .js-pick.w100{width:auto}

@media (max-width: 520px){
  .plan{padding:14px 14px 84px}
  .plan .js-pick{left:14px; right:14px; bottom:14px}
}


/* form validation */
.is-error input,
.is-error textarea {
  border-color: rgba(239, 68, 68, .55) !important;
  box-shadow: 0 0 0 3px rgba(239, 68, 68, .12) !important;
}

fieldset.is-error {
  border: 1px solid rgba(239, 68, 68, .35);
  border-radius: 12px;
  padding: 10px 12px;
}

.err {
  display: block;
  margin-top: 6px;
  font-size: 12px;
  font-weight: 800;
  color: #b91c1c;
}


/* FAQ */
.faq{display:grid;gap:10px;margin-top:14px}
.faq__item{background:rgba(255,255,255,.78);border:1px solid rgba(75,140,255,.25);border-radius:14px;padding:10px 12px;box-shadow:0 10px 24px rgba(0,40,90,.06)}
.faq__item > summary{cursor:pointer;font-weight:900;list-style:none}
.faq__item > summary::-webkit-details-marker{display:none}
.faq__body{margin-top:8px;color:rgba(15,23,42,.86);line-height:1.8}

/* honeypot */
.hp{position:absolute;left:-9999px;top:auto;width:1px;height:1px;overflow:hidden}