/* クーポンなび LP — cream + honey tone (温かみ + 親しみ重視) */

:root{
  --cream:      #FFF6E6;
  --paper:      #FFFFFF;
  --honey:      #FFC93C;
  --amber:      #FF8A1A;
  --amber-text: #8A4D10;   /* 5.6:1 vs cream — text-on-cream で使う */
  --magenta:    #FF3B6B;
  --cocoa:      #1F140E;
  --ink:        #2B1D17;
  --ink-mute:   #6B5A4A;
  --cream-mute: #F4E8C9;
  --pinksoft:   #FFE0E8;
  --mapbg:      #E8F0E3;

  --line:        rgba(31,20,14,.10);
  --line-strong: rgba(31,20,14,.20);
  --honey-soft:  rgba(255,201,60,.20);

  --sans:"Noto Sans JP","Noto Sans KR","Noto Sans SC","Noto Sans TC","Inter","Hiragino Kaku Gothic ProN","Hiragino Sans","Helvetica Neue",system-ui,-apple-system,sans-serif;
}

*{box-sizing:border-box}
html,body{margin:0;padding:0;background:var(--cream);color:var(--ink);font-family:var(--sans);font-size:16px;line-height:1.8;-webkit-font-smoothing:antialiased;text-rendering:optimizeLegibility}
body{min-height:100vh;overflow-x:hidden}

a{color:var(--amber-text);text-decoration:underline;text-decoration-thickness:1px;text-underline-offset:3px;text-decoration-color:var(--honey-soft);transition:color .15s,text-decoration-color .15s}
a:hover{text-decoration-color:currentColor}
.muted{color:var(--ink-mute)}

h1,h2,h3{font-family:var(--sans);font-weight:700;margin:0;color:var(--cocoa);letter-spacing:-.01em}
h1{font-size:clamp(36px,6vw,72px);line-height:1.15;font-weight:700}
h2{font-size:clamp(24px,3.4vw,40px);line-height:1.32;margin:0 0 14px}
h3{font-size:20px;line-height:1.48;margin:0 0 8px}

/* topbar */
.topbar{position:sticky;top:0;z-index:50;background:rgba(255,246,230,.92);backdrop-filter:saturate(180%) blur(10px);border-bottom:1px solid var(--line)}
.topbar-inner{max-width:1080px;margin:0 auto;padding:14px 24px;display:flex;align-items:center;justify-content:space-between;gap:16px}
.brand{font-family:var(--sans);font-size:18px;font-weight:800;color:var(--cocoa);text-decoration:none;letter-spacing:-.01em}
.brand em{color:var(--amber-text);font-style:normal;font-weight:800}
.topbar-nav{display:flex;gap:14px;align-items:center}
.topbar-nav a{color:var(--ink);text-decoration:none;font-size:14px}
.topbar-cta{display:none;gap:8px}
@media(min-width:768px){.topbar-cta{display:inline-flex}}

/* containers */
.wrap{max-width:1080px;margin:0 auto;padding:0 24px}
main section{padding:80px 0;border-bottom:1px solid var(--line)}
main section:last-of-type{border-bottom:0}
.section-marker{font-size:12px;letter-spacing:.16em;text-transform:uppercase;color:var(--amber-text);font-weight:600;margin-bottom:10px}

/* HERO */
.hero{position:relative;padding:96px 0 80px;background:
  radial-gradient(ellipse at 88% 75%,rgba(255,201,60,.32) 0%,transparent 50%),
  radial-gradient(circle at 12% 12%,rgba(255,59,107,.10) 0%,transparent 35%),
  var(--cream);
  overflow:hidden}
.hero .wrap{position:relative;z-index:1}
.hero-icon{display:block;width:96px;height:96px;border-radius:22px;margin:0 0 28px;box-shadow:0 10px 32px -8px rgba(31,20,14,.22),0 4px 12px -4px rgba(255,138,26,.30)}
.hero h1{margin-bottom:24px;color:var(--cocoa)}
.hero h1 em.hl{color:var(--amber-text);font-style:normal;font-weight:800;background:linear-gradient(180deg,transparent 62%,rgba(255,201,60,.55) 62%,rgba(255,201,60,.55) 92%,transparent 92%);padding:0 .08em}
.hero-sub{font-size:clamp(17px,2vw,22px);color:var(--ink);max-width:680px;margin:0 0 32px;line-height:1.7}
.cta-row{display:flex;flex-wrap:wrap;gap:14px;align-items:center;margin:24px 0 18px}
.cta{display:inline-flex;align-items:center;gap:10px;background:var(--cocoa);color:var(--paper);padding:14px 26px;border-radius:14px;text-decoration:none;font-weight:700;font-size:15px;transition:transform .15s,background .15s,box-shadow .15s;border:0;box-shadow:0 6px 18px -8px rgba(31,20,14,.40)}
.cta:hover{background:var(--amber-text);transform:translateY(-2px);box-shadow:0 10px 24px -6px rgba(255,138,26,.40);text-decoration:none}
.cta-secondary{background:var(--paper);color:var(--cocoa);border:1.5px solid var(--cocoa);box-shadow:none}
.cta-secondary:hover{background:var(--cream-mute);color:var(--cocoa);box-shadow:0 6px 18px -8px rgba(31,20,14,.20)}
.trust-row{display:flex;flex-wrap:wrap;gap:24px;font-size:14px;color:var(--ink-mute);margin-top:18px}
.trust-row strong{color:var(--cocoa);font-weight:700}

/* trust strip (section 2) */
.trust-strip{background:var(--cream-mute);padding:36px 0;border-bottom:1px solid var(--line)}
.trust-strip .wrap{display:grid;grid-template-columns:repeat(2,1fr);gap:16px;text-align:center}
@media(min-width:768px){.trust-strip .wrap{grid-template-columns:repeat(4,1fr)}}
.trust-cell{padding:0}
.trust-num{font-size:28px;font-weight:700;color:var(--cocoa);line-height:1.2}
.trust-lbl{font-size:12px;color:var(--ink-mute);margin-top:4px;letter-spacing:.06em}

/* feature cards (4 主要機能) */
.features-grid{display:grid;gap:24px;grid-template-columns:1fr}
@media(min-width:640px){.features-grid{grid-template-columns:repeat(2,1fr)}}
.feat-card{background:var(--paper);border:1px solid var(--cream-mute);border-radius:24px;padding:28px;transition:transform .2s,box-shadow .2s}
.feat-card:hover{transform:translateY(-4px);box-shadow:0 12px 32px rgba(31,20,14,.06)}
.feat-card h3{font-size:22px;color:var(--cocoa);margin:0 0 12px}
.feat-card p{margin:0 0 18px;color:var(--ink)}
.feat-img{width:100%;max-width:280px;height:auto;display:block;margin:0 auto;border-radius:18px}

/* brands list */
.brands-grid{display:grid;grid-template-columns:1fr;gap:14px}
@media(min-width:640px){.brands-grid{grid-template-columns:160px 1fr;column-gap:24px;row-gap:14px}}
.brand-cat{font-weight:700;color:var(--cocoa);font-size:15px}
.brand-list{color:var(--ink);font-size:15px;line-height:1.7}
.brands-note{margin-top:18px;color:var(--ink-mute);font-size:13px}

/* how-it-works steps */
.steps{display:grid;gap:24px;grid-template-columns:1fr;counter-reset:step}
@media(min-width:768px){.steps{grid-template-columns:repeat(4,1fr)}}
.step{padding:0;position:relative}
.step-num{display:inline-grid;place-items:center;width:48px;height:48px;border-radius:50%;background:var(--honey);color:var(--cocoa);font-weight:800;font-size:18px;margin-bottom:14px}
.step h3{font-size:17px;color:var(--cocoa);margin:0 0 6px;line-height:1.4}
.step p{margin:0;color:var(--ink-mute);font-size:14px;line-height:1.7}

/* persona cards */
.persona-grid{display:grid;gap:14px;grid-template-columns:1fr}
@media(min-width:640px){.persona-grid{grid-template-columns:repeat(2,1fr)}}
@media(min-width:1024px){.persona-grid{grid-template-columns:repeat(4,1fr)}}
.persona-card{background:var(--cream-mute);border-radius:16px;padding:22px;font-size:15px;line-height:1.65}
.persona-card strong{display:block;color:var(--cocoa);margin-bottom:4px;font-weight:700}

/* showcase */
.showcase{display:grid;gap:32px;grid-template-columns:1fr;align-items:center}
@media(min-width:768px){.showcase{grid-template-columns:1fr 1fr}}
.showcase-img{width:100%;max-width:320px;height:auto;display:block;margin:0 auto;border-radius:22px}
.showcase-body p{font-size:17px;color:var(--ink);line-height:1.8}

/* spec dl */
.specs{display:grid;gap:14px;grid-template-columns:1fr;margin:0}
@media(min-width:640px){.specs{grid-template-columns:repeat(2,1fr)}}
.spec{margin:0;padding:18px;background:var(--paper);border:1px solid var(--cream-mute);border-radius:14px}
.spec dt{font-size:12px;color:var(--ink-mute);letter-spacing:.06em;margin-bottom:6px}
.spec dd{margin:0;font-size:16px;color:var(--cocoa);font-weight:600}

/* faq */
.faq details{background:var(--paper);border:1px solid var(--cream-mute);border-radius:14px;padding:18px 22px;margin:0 0 12px;transition:border-color .15s}
.faq details[open]{border-color:var(--honey)}
.faq summary{cursor:pointer;font-weight:700;color:var(--cocoa);font-size:16px;list-style:none;position:relative;padding-right:28px}
.faq summary::-webkit-details-marker{display:none}
.faq summary::after{content:"+";position:absolute;right:0;top:0;color:var(--amber-text);font-weight:700;font-size:20px;line-height:1}
.faq details[open] summary::after{content:"−"}
.faq details p{margin:14px 0 0;color:var(--ink);font-size:15px;line-height:1.8}

/* footer */
footer{padding:48px 24px 64px;border-top:1px solid var(--line);background:var(--cream);text-align:center}
footer nav{display:flex;flex-wrap:wrap;gap:18px;justify-content:center;margin-bottom:16px}
footer nav a{color:var(--ink);text-decoration:none;font-size:14px}
footer nav a:hover{color:var(--amber-text);text-decoration:underline}
.footer-notes{max-width:680px;margin:0 auto 12px;color:var(--ink-mute);font-size:13px;line-height:1.8;text-align:left}
.footer-trademark{max-width:680px;margin:0 auto 12px;color:var(--ink-mute);font-size:11px;line-height:1.6}
.copy{color:var(--ink-mute);font-size:13px;margin-top:8px}

/* reduced motion */
@media(prefers-reduced-motion:reduce){
  *,*::before,*::after{animation-duration:.01ms!important;transition-duration:.01ms!important}
}

/* article (privacy/terms/support) */
.article{padding:80px 24px 64px;max-width:760px;margin:0 auto}
.article h1{font-size:clamp(28px,4vw,40px);margin-bottom:8px}
.article .meta{color:var(--ink-mute);font-size:13px;margin-bottom:32px}
.article h2{font-size:22px;margin-top:36px;margin-bottom:12px;color:var(--cocoa)}
.article p,.article ul{font-size:16px;line-height:1.85;color:var(--ink)}
.article ul{padding-left:1.4em;margin:8px 0}
.article a{color:var(--amber-text)}


/* language switcher (dropdown) */
.lang{position:relative;margin-left:8px}
.lang summary{cursor:pointer;list-style:none;color:var(--ink);font-size:13px;padding:6px 10px;border:1px solid var(--cream-mute);border-radius:8px;background:var(--paper);transition:border-color .15s}
.lang summary::-webkit-details-marker{display:none}
.lang summary::after{content:" ▾";color:var(--ink-mute)}
.lang[open] summary{border-color:var(--honey)}
.lang-menu{position:absolute;top:calc(100% + 6px);right:0;background:var(--paper);border:1px solid var(--cream-mute);border-radius:10px;padding:6px;min-width:140px;box-shadow:0 12px 28px -10px rgba(31,20,14,.20);display:flex;flex-direction:column;gap:2px;z-index:60}
.lang-menu a{padding:8px 12px;border-radius:6px;color:var(--ink);text-decoration:none;font-size:13px;transition:background .15s}
.lang-menu a:hover{background:var(--cream-mute)}
.lang-menu a.current{color:var(--amber-text);font-weight:700;background:var(--cream-mute);pointer-events:none}