/* Nthree.design 共通スタイル（全ページ共通） */
:root{
  --ink:#1e242d; --charcoal:#141f27; --charcoal2:#1c2a34; --muted:#5b6672; --line:#e3e6e9;
  --bg:#ffffff; --bg2:#f4f6f7; --accent:#2f7d97; --accent-d:#276579; --accent-l:#7fc4d8; --tint:#eaf3f5;
  --radius:14px; --shadow:0 10px 30px rgba(20,31,39,.08);
  --text:680px; --wide:1040px;
}
*{box-sizing:border-box;margin:0;padding:0}
html{scroll-behavior:smooth;scroll-padding-top:72px}
body{
  font-family:"Zen Kaku Gothic New","Hiragino Kaku Gothic ProN","Yu Gothic",YuGothic,Meiryo,system-ui,sans-serif;
  color:var(--ink);background:var(--bg);line-height:1.9;font-size:16px;font-weight:500;
  -webkit-font-smoothing:antialiased;padding-bottom:76px;
}
@media (min-width:860px){body{padding-bottom:0}}
img{max-width:100%;height:auto;display:block}
a{color:var(--accent-d)}
b,strong{font-weight:700}
.wrap{max-width:var(--text);margin:0 auto;padding:0 20px}
.wide{max-width:var(--wide);margin:0 auto;padding:0 20px}
h1,h2,h3{word-break:keep-all;line-break:strict;overflow-wrap:anywhere;line-height:1.5}
p{margin-bottom:14px}

/* ---------- header ---------- */
.site-head{position:sticky;top:0;z-index:50;background:rgba(20,31,39,.94);backdrop-filter:blur(8px);-webkit-backdrop-filter:blur(8px)}
.site-head .wide{display:flex;align-items:center;justify-content:space-between;height:58px}
.site-head img{height:30px;width:auto}
.site-head .head-cta{color:#fff;background:var(--accent);font-size:13px;font-weight:700;text-decoration:none;padding:8px 14px;border-radius:999px;white-space:nowrap}

/* ---------- hero ---------- */
.hero{background:radial-gradient(120% 90% at 85% 0%,#22394a 0%,var(--charcoal) 60%);color:#eef1f2;padding:40px 0 0;overflow:hidden}
.hero .wide{display:grid;gap:28px}
.hero .eyebrow{display:inline-block;font-size:12px;letter-spacing:.14em;color:var(--accent-l);font-weight:700;border:1px solid rgba(127,196,216,.45);border-radius:999px;padding:3px 12px;margin-bottom:16px}
.hero h1{font-size:clamp(26px,7.2vw,40px);font-weight:900;line-height:1.45;letter-spacing:.01em;margin-bottom:16px}
.hero h1 .accent{color:var(--accent-l)}
.hero .sub{color:#c3ccd2;font-size:15px;margin-bottom:22px}
.hero-btns{display:grid;gap:10px;max-width:360px}
.hero .points{list-style:none;display:flex;flex-wrap:wrap;gap:8px 16px;margin-top:20px;font-size:13px;color:#aeb9c0}
.hero .points li::before{content:"✓";color:var(--accent-l);font-weight:700;margin-right:5px}
.hero-visual{position:relative;height:300px;margin:0 -20px}
.phone{position:absolute;width:190px;border-radius:26px;padding:7px;background:#0b1217;box-shadow:0 24px 50px rgba(0,0,0,.45),inset 0 0 0 1px rgba(255,255,255,.08)}
.phone img{border-radius:20px;width:100%}
.hero-visual .p1{left:50%;transform:translateX(-82%) rotate(-5deg);top:22px;z-index:2}
.hero-visual .p2{left:50%;transform:translateX(-8%) rotate(4deg);top:44px;opacity:.95}
@media (min-width:860px){
  .hero{padding:72px 0 56px}
  .hero .wide{grid-template-columns:1.1fr .9fr;align-items:center}
  .hero-visual{height:440px;margin:0}
  .phone{width:230px}
  .hero-visual .p1{top:30px}
  .hero-visual .p2{top:70px}
}

/* ---------- buttons ---------- */
.btn{display:flex;align-items:center;justify-content:center;gap:8px;text-align:center;font-weight:700;font-size:15px;
  padding:15px 22px;border-radius:12px;text-decoration:none;border:1.5px solid transparent;cursor:pointer;font-family:inherit;transition:transform .15s,box-shadow .15s}
.btn:hover{transform:translateY(-1px)}
.btn-primary{background:var(--accent);color:#fff;box-shadow:0 8px 20px rgba(47,125,151,.35)}
.btn-light{background:#fff;color:var(--charcoal)}
.btn-ghost{background:transparent;color:#fff;border-color:rgba(255,255,255,.45)}
.btn-outline{background:#fff;color:var(--accent-d);border-color:var(--accent)}
.btn small{font-weight:500;font-size:12px;opacity:.85}

/* ---------- sections ---------- */
section{padding:56px 0}
section.alt{background:var(--bg2)}
.sec-title{margin-bottom:22px}
.sec-title .en{display:block;font-size:11px;letter-spacing:.26em;color:var(--accent);font-weight:700;margin-bottom:6px}
.sec-title h2{font-size:clamp(20px,5.4vw,26px);font-weight:900;letter-spacing:.02em}
.lead{font-size:15px;color:var(--muted);margin-bottom:22px}

/* pain / feature cards */
.cards{display:grid;gap:12px}
@media (min-width:640px){.cards.two{grid-template-columns:1fr 1fr}}
.card{background:#fff;border:1px solid var(--line);border-radius:var(--radius);padding:18px 18px 16px;display:flex;gap:14px;align-items:flex-start}
section:not(.alt) .card{background:var(--bg2)}
.card .ic{flex:0 0 40px;height:40px;border-radius:12px;background:var(--tint);color:var(--accent-d);display:flex;align-items:center;justify-content:center}
.card .ic svg{width:22px;height:22px}
.card h3{font-size:15.5px;font-weight:700;margin-bottom:2px}
.card p{font-size:14px;color:var(--muted);margin-bottom:0;line-height:1.75}

/* ---------- works gallery ---------- */
.works{display:grid;grid-auto-flow:column;grid-auto-columns:64%;gap:14px;overflow-x:auto;scroll-snap-type:x mandatory;padding:4px 20px 14px;margin:0 -20px;-webkit-overflow-scrolling:touch}
.works::-webkit-scrollbar{height:6px}.works::-webkit-scrollbar-thumb{background:#cfd6db;border-radius:3px}
@media (min-width:640px){.works{grid-auto-flow:row;grid-template-columns:repeat(3,1fr);overflow:visible;margin:0;padding:0}}
.work{scroll-snap-align:start;background:#fff;border:1px solid var(--line);border-radius:var(--radius);overflow:hidden;text-decoration:none;color:var(--ink);display:flex;flex-direction:column;box-shadow:var(--shadow);transition:transform .2s}
.work:hover{transform:translateY(-3px)}
.work .shot{background:linear-gradient(160deg,#e8eef1,#d9e3e8);padding:16px 18px 0}
.work .shot img{aspect-ratio:5/4;object-fit:cover;object-position:top;border-radius:12px 12px 0 0;box-shadow:0 6px 18px rgba(20,31,39,.18)}
.work .meta{padding:12px 14px 14px;border-top:1px solid var(--line)}
.work .tag{display:inline-block;font-size:11.5px;font-weight:700;color:var(--accent-d);background:var(--tint);border-radius:999px;padding:1px 10px;margin-bottom:4px}
.work .name{display:block;font-size:14px;font-weight:700}
.work .open{display:block;font-size:12.5px;color:var(--accent-d);margin-top:2px}
.scroll-hint{font-size:12.5px;color:var(--muted);margin-top:4px}
@media (min-width:640px){.scroll-hint{display:none}}

/* ---------- price ---------- */
.price-card{background:#fff;border:1px solid var(--line);border-radius:var(--radius);padding:22px;box-shadow:var(--shadow)}
.price-card + .price-card{margin-top:14px}
.price-card .label{font-size:14px;font-weight:700;color:var(--muted)}
.price-card .amount{font-size:34px;font-weight:900;color:var(--charcoal);letter-spacing:.01em;line-height:1.3}
.price-card .amount small{font-size:14px;font-weight:700;margin-left:2px}
.price-card ul{list-style:none;margin-top:10px;font-size:14px;color:var(--muted)}
.price-card li{padding:8px 0 8px 22px;border-top:1px dashed var(--line);position:relative}
.price-card li::before{content:"";position:absolute;left:2px;top:17px;width:10px;height:6px;border-left:2px solid var(--accent);border-bottom:2px solid var(--accent);transform:rotate(-45deg)}
.campaign{display:flex;gap:10px;align-items:center;background:linear-gradient(90deg,#fff5e6,#fff);border:1px solid #f3d9ad;border-radius:12px;padding:12px 14px;margin-bottom:14px;font-size:14px}
.campaign .pill{flex:none;background:#e08a1e;color:#fff;font-size:11.5px;font-weight:700;border-radius:999px;padding:2px 10px}
.campaign b{color:#b3640a}
.note{font-size:12.5px;color:var(--muted);line-height:1.85;margin-top:14px}
.free-demo{margin-top:18px;background:var(--charcoal);color:#e7ecef;border-radius:var(--radius);padding:20px;font-size:14.5px}
.free-demo b{color:#fff;font-size:16px;display:block;margin-bottom:4px}

/* ---------- option ---------- */
.opt-list{display:grid;gap:12px}
.opt{background:#fff;border:1px solid var(--line);border-radius:var(--radius);padding:16px 18px}
.opt h3{font-size:15.5px;font-weight:700;margin-bottom:4px}
.opt p{font-size:13.5px;color:var(--muted);margin-bottom:10px;line-height:1.75}
.opt .prices{display:flex;flex-wrap:wrap;align-items:baseline;gap:4px 12px;font-size:13px;color:var(--muted)}
.opt .prices s{color:#97a1a9}
.opt .prices .set{font-size:17px;font-weight:900;color:var(--accent-d)}
.opt .prices .set.free{color:#c0392b}
.opt-shot{margin-top:16px;border:1px solid var(--line);border-radius:var(--radius);overflow:hidden;background:#fff;box-shadow:var(--shadow)}
.opt-shot .cap{padding:10px 14px;font-size:12.5px;color:var(--muted);border-top:1px solid var(--line)}

/* ---------- flow ---------- */
.flow{list-style:none;position:relative;display:grid;gap:0}
.flow li{position:relative;padding:0 0 22px 48px}
.flow li:last-child{padding-bottom:0}
.flow li::before{content:attr(data-n);position:absolute;left:0;top:0;width:32px;height:32px;border-radius:50%;background:var(--accent);color:#fff;font-size:14px;font-weight:700;display:flex;align-items:center;justify-content:center}
.flow li::after{content:"";position:absolute;left:15px;top:34px;bottom:2px;width:2px;background:var(--line)}
.flow li:last-child::after{display:none}
.flow b{display:block;font-size:15.5px}
.flow span{font-size:14px;color:var(--muted)}

/* ---------- faq ---------- */
.faq details{background:#fff;border:1px solid var(--line);border-radius:12px;margin-bottom:10px;padding:0 16px}
section:not(.alt) .faq details{background:var(--bg2)}
.faq summary{font-weight:700;font-size:15px;cursor:pointer;list-style:none;position:relative;padding:15px 28px 15px 0}
.faq summary::-webkit-details-marker{display:none}
.faq summary::before{content:"Q.";color:var(--accent);margin-right:6px}
.faq summary::after{content:"＋";position:absolute;right:0;top:15px;color:var(--accent)}
.faq details[open] summary::after{content:"−"}
.faq details p{font-size:14px;color:var(--muted);padding:0 0 16px;margin:0}

/* ---------- contact ---------- */
.contact{background:var(--charcoal);color:#e7ecef}
.contact .sec-title .en{color:var(--accent-l)}
.contact .sec-title h2{color:#fff}
.contact .lead{color:#b9c4cb}
.form{background:#fff;color:var(--ink);border-radius:18px;padding:22px 18px;display:grid;gap:16px}
.field label,.field .lab{display:block;font-size:14px;font-weight:700;margin-bottom:6px}
.req{display:inline-block;background:#c0392b;color:#fff;font-size:10.5px;border-radius:4px;padding:0 6px;margin-left:6px;vertical-align:2px}
.opt-tag{display:inline-block;background:#e3e6e9;color:var(--muted);font-size:10.5px;border-radius:4px;padding:0 6px;margin-left:6px;vertical-align:2px}
.field input,.field select,.field textarea{width:100%;font:inherit;font-size:16px;color:var(--ink);background:var(--bg2);border:1.5px solid var(--line);border-radius:10px;padding:12px 13px;appearance:none;-webkit-appearance:none}
.field textarea{min-height:110px;resize:vertical}
.field select{background-image:linear-gradient(45deg,transparent 50%,var(--muted) 50%),linear-gradient(135deg,var(--muted) 50%,transparent 50%);background-position:calc(100% - 18px) 52%,calc(100% - 13px) 52%;background-size:5px 5px;background-repeat:no-repeat}
.field input:focus,.field select:focus,.field textarea:focus{outline:none;border-color:var(--accent);background:#fff}
.chips{display:flex;flex-wrap:wrap;gap:8px}
.chips label{position:relative;margin:0;font-weight:500;font-size:14px}
.chips input{position:absolute;opacity:0;pointer-events:none}
.chips span{display:inline-block;border:1.5px solid var(--line);border-radius:999px;padding:7px 14px;cursor:pointer;background:var(--bg2)}
.chips input:checked + span{border-color:var(--accent);background:var(--tint);color:var(--accent-d);font-weight:700}
.chips input:focus-visible + span{outline:2px solid var(--accent);outline-offset:2px}
.hp-field{position:absolute;left:-9999px;width:1px;height:1px;overflow:hidden}
.form .privacy{font-size:12px;color:var(--muted);line-height:1.7;margin:0}
.form .btn{width:100%;font-size:16px}
.form-msg{display:none;border-radius:12px;padding:16px;font-size:14.5px}
.form-msg.ok{display:block;background:#e8f5e9;color:#1b5e20}
.form-msg.err{display:block;background:#ffebee;color:#b71c1c}
.contact-alt{text-align:center;margin-top:22px;font-size:13.5px;color:#b9c4cb}
.contact-alt a{color:#fff}

/* ---------- about / footer ---------- */
.site-foot{background:#0e171d;color:#8e9aa2;text-align:center;padding:30px 20px 34px;font-size:12.5px}
.site-foot img{width:120px;margin:0 auto 12px;opacity:.85}
.site-foot a{color:#c3ccd2}
.site-foot nav{display:flex;justify-content:center;flex-wrap:wrap;gap:6px 16px;margin-bottom:14px}

/* ---------- sticky bottom bar (mobile) ---------- */
.sticky-cta{position:fixed;left:0;right:0;bottom:0;z-index:60;background:rgba(255,255,255,.96);backdrop-filter:blur(8px);-webkit-backdrop-filter:blur(8px);
  border-top:1px solid var(--line);padding:10px 14px calc(10px + env(safe-area-inset-bottom));display:grid;grid-template-columns:1fr auto;gap:8px;
  transform:translateY(110%);transition:transform .25s}
.sticky-cta.show{transform:none}
.sticky-cta .btn{padding:12px 14px;font-size:14.5px}
.sticky-cta .btn-outline{padding:12px 16px}
@media (min-width:860px){.sticky-cta{display:none}}

/* reveal */
.rv{opacity:0;transform:translateY(14px);transition:opacity .6s,transform .6s}
.rv.in{opacity:1;transform:none}
@media (prefers-reduced-motion:reduce){.rv{opacity:1;transform:none;transition:none}html{scroll-behavior:auto}}
.hero-visual.single .p1{transform:translateX(-50%) rotate(-3deg)}
.work-cta{background:var(--charcoal);color:#fff;justify-content:center;align-items:center;text-align:center;padding:24px 18px;gap:10px;min-height:220px}
.work-cta .big{font-size:17px;font-weight:900;line-height:1.5}
.work-cta .small{font-size:13px;color:#b9c4cb;line-height:1.7}
.work-cta .go{margin-top:6px;background:var(--accent);border-radius:999px;padding:8px 16px;font-size:13.5px;font-weight:700}