/* =========================================================
   SmartLearning 宅建 — landing site
   Palette : paper / ink / pine(合格green) / amber / slate
   Type    : Noto Sans JP (display+body) / IBM Plex Mono (data)
   ========================================================= */

:root {
  --paper:      #F7F5EF;
  --card:       #FFFFFF;
  --ink:        #202430;
  --slate:      #5B6472;
  --pine:       #1F7A54;
  --pine-deep:  #145C3E;
  --pine-soft:  #E7F1EB;
  --amber:      #DD9B24;
  --line:       #E6E1D6;
  --line-soft:  #EFEBE1;

  --wrap: 1080px;
  --radius: 14px;
  --radius-sm: 10px;

  --shadow-sm: 0 1px 2px rgba(32,36,48,.05), 0 2px 8px rgba(32,36,48,.05);
  --shadow-md: 0 6px 24px rgba(32,36,48,.09);
  --shadow-lg: 0 18px 48px rgba(20,92,62,.14);
}

* { box-sizing: border-box; }

html { scroll-behavior: smooth; }

body {
  margin: 0;
  background: var(--paper);
  color: var(--ink);
  font-family: "Noto Sans JP", system-ui, sans-serif;
  font-weight: 400;
  line-height: 1.8;
  -webkit-font-smoothing: antialiased;
  text-rendering: optimizeLegibility;
}

@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
  * { animation: none !important; transition: none !important; }
}

a { color: inherit; text-decoration: none; }
img { max-width: 100%; display: block; }

.wrap { width: 100%; max-width: var(--wrap); margin: 0 auto; padding: 0 24px; }

.mono { font-family: "IBM Plex Mono", ui-monospace, monospace; }

.eyebrow {
  font-family: "IBM Plex Mono", ui-monospace, monospace;
  font-size: .72rem;
  letter-spacing: .18em;
  text-transform: uppercase;
  color: var(--pine);
  font-weight: 500;
  margin: 0 0 14px;
}

/* ---------- buttons ---------- */
.btn {
  display: inline-flex; align-items: center; gap: .5em;
  font-family: inherit; font-weight: 700; font-size: .95rem;
  padding: 13px 24px; border-radius: 999px;
  border: 1.5px solid transparent; cursor: pointer;
  transition: transform .15s ease, background .15s ease, border-color .15s ease, color .15s ease;
}
.btn-primary { background: var(--pine); color: #fff; }
.btn-primary:hover { background: var(--pine-deep); transform: translateY(-1px); }
.btn-ghost { background: transparent; color: var(--ink); border-color: var(--line); }
.btn-ghost:hover { border-color: var(--pine); color: var(--pine); }
.btn:focus-visible { outline: 3px solid rgba(31,122,84,.4); outline-offset: 2px; }

/* ---------- header ---------- */
.site-header {
  position: sticky; top: 0; z-index: 50;
  background: rgba(247,245,239,.82);
  backdrop-filter: saturate(140%) blur(10px);
  border-bottom: 1px solid var(--line-soft);
}
.header-inner { display: flex; align-items: center; justify-content: space-between; height: 66px; }
.brand { display: flex; align-items: baseline; gap: .55em; font-weight: 700; }
.brand .brand-mark { font-family: "IBM Plex Mono", monospace; font-size: .68rem; letter-spacing: .12em; color: var(--slate); font-weight: 500; }
.brand .brand-name { font-size: 1.06rem; letter-spacing: .01em; }
.brand .brand-name b { color: var(--pine); }

.nav { display: flex; align-items: center; gap: 28px; }
.nav a.nav-link { font-size: .9rem; font-weight: 500; color: var(--slate); transition: color .15s; }
.nav a.nav-link:hover { color: var(--ink); }
.nav .btn { padding: 9px 18px; font-size: .85rem; }

.nav-toggle { display: none; background: none; border: 0; cursor: pointer; padding: 6px; }
.nav-toggle span { display: block; width: 22px; height: 2px; background: var(--ink); margin: 4px 0; border-radius: 2px; transition: .2s; }

/* ---------- hero ---------- */
.hero { padding: 72px 0 88px; overflow: hidden; }
.hero-grid { display: grid; grid-template-columns: 1.05fr .95fr; gap: 56px; align-items: center; }
.hero h1 {
  font-size: clamp(2.1rem, 4.6vw, 3.35rem);
  font-weight: 900; line-height: 1.28; letter-spacing: -.01em;
  margin: 0 0 20px;
}
.hero h1 .u { color: var(--pine); }
.hero-lead { font-size: 1.05rem; color: var(--slate); margin: 0 0 30px; max-width: 30em; }
.hero-cta { display: flex; gap: 12px; flex-wrap: wrap; }
.hero-note { margin-top: 18px; font-size: .8rem; color: var(--slate); font-family: "IBM Plex Mono", monospace; }

/* ---------- quiz card (signature) ---------- */
.quiz {
  background: var(--card); border-radius: var(--radius);
  box-shadow: var(--shadow-lg); border: 1px solid var(--line-soft);
  padding: 26px; position: relative;
}
.quiz-top { display: flex; align-items: center; justify-content: space-between; margin-bottom: 18px; }
.quiz-tag {
  font-family: "IBM Plex Mono", monospace; font-size: .7rem; letter-spacing: .08em;
  color: var(--pine); background: var(--pine-soft); padding: 5px 10px; border-radius: 6px; font-weight: 500;
}
.quiz-streak { font-family: "IBM Plex Mono", monospace; font-size: .72rem; color: var(--slate); }
.quiz-streak b { color: var(--amber); }
.quiz-q {
  font-size: 1.06rem; font-weight: 500; line-height: 1.85; min-height: 5.5em;
  margin: 0 0 20px; letter-spacing: .005em;
}
.quiz-choices { display: grid; grid-template-columns: 1fr 1fr; gap: 12px; }
.choice {
  font-family: inherit; font-size: 1.4rem; font-weight: 700;
  padding: 16px 0; border-radius: var(--radius-sm);
  border: 1.5px solid var(--line); background: #fff; color: var(--ink);
  cursor: pointer; transition: .15s;
}
.choice:hover:not(:disabled) { border-color: var(--pine); background: var(--pine-soft); }
.choice:focus-visible { outline: 3px solid rgba(31,122,84,.4); outline-offset: 2px; }
.choice.is-correct { border-color: var(--pine); background: var(--pine-soft); color: var(--pine-deep); }
.choice.is-wrong { border-color: #C6553F; background: #FBEDE9; color: #9E3B28; }
.choice:disabled { cursor: default; opacity: .9; }

.quiz-answer {
  margin-top: 18px; padding: 15px 16px; border-radius: var(--radius-sm);
  background: var(--pine-soft); border: 1px solid #CFE4D8;
  font-size: .88rem; line-height: 1.75; color: var(--ink);
  display: none;
}
.quiz-answer.show { display: block; animation: rise .28s ease; }
.quiz-answer .verdict { font-weight: 700; }
.quiz-answer .verdict.ok { color: var(--pine-deep); }
.quiz-answer .verdict.ng { color: #9E3B28; }
.quiz-next {
  margin-top: 14px; width: 100%; justify-content: center; display: none;
}
.quiz-next.show { display: inline-flex; }

@keyframes rise { from { opacity: 0; transform: translateY(6px); } to { opacity: 1; transform: none; } }

/* ---------- stats ---------- */
.stats { border-top: 1px solid var(--line); border-bottom: 1px solid var(--line); background: #fff; }
.stats-grid { display: grid; grid-template-columns: repeat(4, 1fr); }
.stat { padding: 34px 20px; text-align: center; border-right: 1px solid var(--line-soft); }
.stat:last-child { border-right: 0; }
.stat .num { font-family: "IBM Plex Mono", monospace; font-size: 2.15rem; font-weight: 600; color: var(--pine); line-height: 1.1; letter-spacing: -.02em; }
.stat .num small { font-size: 1rem; color: var(--slate); font-weight: 500; }
.stat .lab { font-size: .82rem; color: var(--slate); margin-top: 8px; }

/* ---------- section ---------- */
.section { padding: 84px 0; }
.section-head { max-width: 40em; margin-bottom: 44px; }
.section-head h2 { font-size: clamp(1.6rem, 3vw, 2.15rem); font-weight: 900; margin: 0 0 12px; letter-spacing: -.01em; }
.section-head p { color: var(--slate); margin: 0; }

/* features */
.feature-grid { display: grid; grid-template-columns: repeat(2, 1fr); gap: 20px; }
.feature {
  background: var(--card); border: 1px solid var(--line-soft); border-radius: var(--radius);
  padding: 30px; box-shadow: var(--shadow-sm); transition: transform .18s ease, box-shadow .18s ease;
}
.feature:hover { transform: translateY(-3px); box-shadow: var(--shadow-md); }
.feature .fnum { font-family: "IBM Plex Mono", monospace; font-size: .72rem; color: var(--pine); letter-spacing: .1em; }
.feature h3 { font-size: 1.18rem; font-weight: 700; margin: 10px 0 10px; }
.feature p { color: var(--slate); font-size: .92rem; margin: 0; }

/* steps */
.steps { display: grid; grid-template-columns: repeat(3, 1fr); gap: 24px; counter-reset: step; }
.step { position: relative; padding-top: 20px; }
.step::before {
  counter-increment: step; content: counter(step, decimal-leading-zero);
  font-family: "IBM Plex Mono", monospace; font-size: .78rem; color: var(--amber); font-weight: 500;
  display: block; margin-bottom: 10px;
}
.step h3 { font-size: 1.1rem; font-weight: 700; margin: 0 0 8px; }
.step p { color: var(--slate); font-size: .92rem; margin: 0; }
.step-line { height: 2px; background: linear-gradient(90deg, var(--pine), transparent); margin-bottom: 4px; }

/* faq */
.faq { max-width: 760px; }
.qa { border-bottom: 1px solid var(--line); }
.qa summary {
  list-style: none; cursor: pointer; padding: 22px 40px 22px 0; position: relative;
  font-weight: 500; font-size: 1rem;
}
.qa summary::-webkit-details-marker { display: none; }
.qa summary::after {
  content: "+"; position: absolute; right: 4px; top: 18px;
  font-family: "IBM Plex Mono", monospace; font-size: 1.4rem; color: var(--pine); transition: transform .2s;
}
.qa[open] summary::after { content: "–"; }
.qa .qa-body { padding: 0 0 22px; color: var(--slate); font-size: .92rem; }

/* cta band */
.cta-band { background: var(--ink); color: #fff; border-radius: 20px; padding: 56px 40px; text-align: center; }
.cta-band h2 { font-size: clamp(1.6rem, 3vw, 2.2rem); font-weight: 900; margin: 0 0 14px; }
.cta-band p { color: #B9BECB; margin: 0 auto 28px; max-width: 34em; }
.store-row { display: flex; gap: 14px; justify-content: center; flex-wrap: wrap; }
.store {
  display: inline-flex; align-items: center; gap: 10px;
  background: rgba(255,255,255,.08); border: 1px solid rgba(255,255,255,.16);
  padding: 12px 20px; border-radius: 12px; color: #fff; font-size: .9rem;
}
.store b { font-weight: 700; }
.store .soon { font-family: "IBM Plex Mono", monospace; font-size: .64rem; color: var(--amber); border: 1px solid var(--amber); padding: 1px 6px; border-radius: 5px; }
.cta-mail { margin-top: 22px; font-size: .85rem; color: #9BA2B0; font-family: "IBM Plex Mono", monospace; }
.cta-mail a { color: #fff; text-decoration: underline; }

/* ---------- footer ---------- */
.site-footer { border-top: 1px solid var(--line); padding: 52px 0 40px; margin-top: 20px; }
.footer-grid { display: flex; justify-content: space-between; gap: 40px; flex-wrap: wrap; }
.footer-brand .brand-name { font-weight: 700; font-size: 1.05rem; }
.footer-brand p { color: var(--slate); font-size: .85rem; margin: 10px 0 0; max-width: 24em; }
.footer-cols { display: flex; gap: 56px; flex-wrap: wrap; }
.footer-col h4 { font-family: "IBM Plex Mono", monospace; font-size: .68rem; letter-spacing: .12em; text-transform: uppercase; color: var(--slate); margin: 0 0 14px; font-weight: 500; }
.footer-col a { display: block; font-size: .88rem; color: var(--ink); margin-bottom: 10px; transition: color .15s; }
.footer-col a:hover { color: var(--pine); }
.footer-base { margin-top: 40px; padding-top: 24px; border-top: 1px solid var(--line-soft); display: flex; justify-content: space-between; gap: 16px; flex-wrap: wrap; font-size: .78rem; color: var(--slate); font-family: "IBM Plex Mono", monospace; }

/* ---------- legal / content pages ---------- */
.doc { padding: 56px 0 72px; }
.doc-wrap { max-width: 760px; }
.doc h1 { font-size: clamp(1.7rem, 3.4vw, 2.3rem); font-weight: 900; margin: 0 0 8px; }
.doc .doc-meta { font-family: "IBM Plex Mono", monospace; font-size: .78rem; color: var(--slate); margin-bottom: 36px; }
.doc h2 { font-size: 1.2rem; font-weight: 700; margin: 40px 0 12px; padding-top: 8px; }
.doc h3 { font-size: 1.02rem; font-weight: 700; margin: 24px 0 8px; }
.doc p, .doc li { color: #2E3440; font-size: .94rem; }
.doc ul, .doc ol { padding-left: 1.3em; }
.doc li { margin-bottom: 6px; }
.doc .back { display: inline-flex; align-items: center; gap: .4em; font-size: .85rem; color: var(--pine); margin-bottom: 28px; font-weight: 500; }
.doc .note { background: var(--pine-soft); border: 1px solid #CFE4D8; border-radius: var(--radius-sm); padding: 14px 16px; font-size: .85rem; color: var(--ink); }

/* ---------- responsive ---------- */
@media (max-width: 860px) {
  .hero-grid { grid-template-columns: 1fr; gap: 40px; }
  .stats-grid { grid-template-columns: 1fr 1fr; }
  .stat:nth-child(2) { border-right: 0; }
  .stat:nth-child(1), .stat:nth-child(2) { border-bottom: 1px solid var(--line-soft); }
  .feature-grid { grid-template-columns: 1fr; }
  .steps { grid-template-columns: 1fr; gap: 28px; }
  .nav .nav-link { display: none; }
  .nav-toggle { display: block; }
  .nav.open .nav-link { display: block; }
  .nav.open { position: absolute; top: 66px; left: 0; right: 0; background: var(--paper); border-bottom: 1px solid var(--line); flex-direction: column; align-items: flex-start; gap: 4px; padding: 16px 24px; }
}
@media (max-width: 480px) {
  .section { padding: 60px 0; }
  .cta-band { padding: 40px 22px; }
  .quiz-choices { grid-template-columns: 1fr 1fr; }
}