/*
 * style.css — 日本台湾貿易協会（tw-jp.org）
 * デザイン：日台らしい紅(レッド)×墨(チャコール)のB2Bコーポレート。信頼感と国際感。
 * 日本語＋繁體中文の両フォントに対応。
 */
:root{
  --red-600:#c8102e; --red-700:#a50d24; --red-500:#e0233f; --red-050:#fdeef0;
  --ink-900:#1a1c22; --ink-700:#33363f; --ink-600:#565a66; --ink-400:#8a8f9c;
  --line:#e7e4e0; --paper:#faf8f6; --paper-2:#f2eeea; --white:#fff; --gold:#b9975b;
  --serif:"Noto Serif JP","Noto Serif TC","Yu Mincho",serif;
  --sans:"Noto Sans JP","Noto Sans TC","Hiragino Kaku Gothic ProN",sans-serif;
  --wrap:1160px; --header-h:74px; --radius:12px;
}
*{box-sizing:border-box;margin:0;padding:0}
html{scroll-behavior:smooth;-webkit-text-size-adjust:100%}
body{font-family:var(--sans);color:var(--ink-900);background:var(--paper);line-height:1.85;letter-spacing:.02em;font-size:16px;overflow-x:hidden}
img{max-width:100%;height:auto;display:block}
a{color:inherit;text-decoration:none;transition:.2s}
ul{list-style:none}
.wrap{width:min(var(--wrap),92%);margin-inline:auto}
.serif{font-family:var(--serif)}

.section{padding:clamp(3.25rem,7vw,5.75rem) 0}
.section--tint{background:var(--paper-2)}
.section--ink{background:var(--ink-900);color:#eceef2}
.section-head{margin-bottom:clamp(1.75rem,4vw,3rem);text-align:center}
.section-head .en{display:block;font-size:.72rem;letter-spacing:.3em;color:var(--red-600);font-weight:700;margin-bottom:.5rem}
.section-head .ja{font-family:var(--serif);font-size:clamp(1.5rem,3.4vw,2.15rem);font-weight:600;color:var(--ink-900);line-height:1.5}
.section-head .lead{margin:1rem auto 0;color:var(--ink-600);max-width:680px}
.section--ink .section-head .ja{color:#fff}

.btn{display:inline-flex;align-items:center;gap:.6rem;font-weight:700;font-size:.94rem;padding:.95rem 2.1rem;border-radius:6px;border:2px solid var(--red-600);color:var(--red-600);background:transparent;cursor:pointer;transition:.25s;line-height:1.4}
.btn:hover{background:var(--red-600);color:#fff}
.btn--fill{background:var(--red-600);color:#fff}
.btn--fill:hover{background:var(--red-700);border-color:var(--red-700)}
.btn--ghost{border-color:rgba(255,255,255,.7);color:#fff}
.btn--ghost:hover{background:#fff;color:var(--ink-900);border-color:#fff}
.btn .arrow{transition:transform .2s}
.btn:hover .arrow{transform:translateX(4px)}

/* ヘッダー */
.header{position:fixed;top:0;left:0;right:0;z-index:100;height:var(--header-h);display:flex;align-items:center;background:rgba(255,255,255,.96);box-shadow:0 1px 0 var(--line);backdrop-filter:saturate(1.2) blur(4px)}
.header .wrap{display:flex;align-items:center;justify-content:space-between;width:min(var(--wrap),95%)}
.brand{display:flex;align-items:center;gap:.7rem;color:var(--ink-900)}
.brand__mark{width:38px;height:38px;flex:none;border-radius:50%;background:var(--red-600);color:#fff;display:grid;place-items:center;font-family:var(--serif);font-weight:700;font-size:.95rem;letter-spacing:.02em}
.brand__name{font-family:var(--serif);font-weight:600;font-size:1.02rem;line-height:1.2}
.brand__name small{display:block;font-family:var(--sans);font-size:.58rem;letter-spacing:.22em;color:var(--red-600);font-weight:700}
.nav{display:flex;align-items:center;gap:1.5rem}
.nav a{color:var(--ink-700);font-size:.9rem;font-weight:500;position:relative;padding:.3rem 0}
.nav a::after{content:"";position:absolute;left:0;bottom:-2px;width:0;height:2px;background:var(--red-600);transition:width .25s}
.nav a:hover{color:var(--red-600)}
.nav a:hover::after{width:100%}
.nav__cta{background:var(--red-600);color:#fff!important;padding:.55rem 1.2rem!important;border-radius:6px}
.nav__cta::after{display:none}
.nav__cta:hover{background:var(--red-700)}
.langswitch{display:inline-flex;border:1px solid var(--line);border-radius:999px;overflow:hidden;font-size:.76rem;font-weight:700}
.langswitch button{border:0;background:transparent;padding:.35rem .8rem;cursor:pointer;color:var(--ink-400);font-family:var(--sans)}
.langswitch button.on{background:var(--ink-900);color:#fff}
.nav-toggle{display:none;background:none;border:0;cursor:pointer;width:32px;height:24px;position:relative}
.nav-toggle span{position:absolute;left:0;width:100%;height:2px;background:var(--ink-900);transition:.3s}
.nav-toggle span:nth-child(1){top:1px}.nav-toggle span:nth-child(2){top:11px}.nav-toggle span:nth-child(3){top:21px}
.nav-toggle.open span:nth-child(1){top:11px;transform:rotate(45deg)}
.nav-toggle.open span:nth-child(2){opacity:0}
.nav-toggle.open span:nth-child(3){top:11px;transform:rotate(-45deg)}

/* ヒーロー */
.hero{position:relative;min-height:92vh;display:flex;align-items:center;color:#fff;overflow:hidden;background:linear-gradient(150deg,#23252d 0%,#3a1218 55%,var(--red-700) 120%)}
.hero::before{content:"";position:absolute;inset:0;background:radial-gradient(900px 520px at 82% 12%,rgba(200,16,46,.35),transparent 62%)}
.hero::after{content:"";position:absolute;right:8%;top:22%;width:230px;height:230px;border-radius:50%;background:radial-gradient(circle,rgba(255,255,255,.10),rgba(200,16,46,.35) 60%,transparent 72%)}
.hero__inner{position:relative;z-index:2;padding-top:var(--header-h)}
.hero__eyebrow{font-size:.82rem;letter-spacing:.22em;color:#f3b9c1;margin-bottom:1.3rem;font-weight:700}
.hero h1{font-family:var(--serif);font-weight:600;font-size:clamp(1.9rem,4.8vw,3.4rem);line-height:1.42;margin-bottom:1.5rem;white-space:pre-line}
.hero__lead{max-width:640px;color:#e6e2df;font-size:clamp(.98rem,1.6vw,1.08rem);margin-bottom:2.4rem}
.hero__actions{display:flex;gap:1rem;flex-wrap:wrap}

/* サービスカード */
.cards{display:grid;gap:1.4rem;grid-template-columns:repeat(auto-fit,minmax(260px,1fr))}
.card{background:#fff;border:1px solid var(--line);border-radius:var(--radius);padding:2rem 1.7rem;transition:.25s;position:relative;overflow:hidden}
.card::before{content:"";position:absolute;top:0;left:0;width:100%;height:3px;background:var(--red-600);transform:scaleX(0);transform-origin:left;transition:transform .3s}
.card:hover{transform:translateY(-4px);box-shadow:0 16px 36px rgba(26,28,34,.10)}
.card:hover::before{transform:scaleX(1)}
.card__ic{font-size:2rem;margin-bottom:.9rem;line-height:1}
.card h3{font-family:var(--serif);font-size:1.12rem;color:var(--ink-900);margin-bottom:.7rem}
.card p{font-size:.9rem;color:var(--ink-600)}

/* 強み */
.stbar{display:grid;grid-template-columns:repeat(3,1fr)}
.st{padding:2.4rem 1.3rem;text-align:center;border-left:1px solid rgba(255,255,255,.1)}
.st:first-child{border-left:0}
.st__n{font-family:var(--serif);font-size:clamp(1.3rem,2.6vw,1.9rem);color:var(--red-500);line-height:1.2;font-weight:600}
.st__l{margin-top:.7rem;font-size:.82rem;color:#c7cad3}

/* ARTiS 特集 */
.artis-feat{display:grid;grid-template-columns:1.1fr 1fr;gap:clamp(2rem,5vw,4rem);align-items:center}
.artis-feat__body .en{font-size:.72rem;letter-spacing:.3em;color:var(--red-600);font-weight:700}
.artis-feat__body h2{font-family:var(--serif);font-size:clamp(1.5rem,3.2vw,2.1rem);color:var(--ink-900);margin:.7rem 0 1.2rem;line-height:1.5}
.artis-feat__body p{color:var(--ink-600);margin-bottom:1.6rem}
.artis-feat__visual{aspect-ratio:4/3;border-radius:var(--radius);background:linear-gradient(150deg,#efe9e4,#dcd2c8);position:relative;overflow:hidden;display:grid;place-items:center}
.artis-feat__visual .wm{font-family:var(--serif);font-size:clamp(1.4rem,3vw,2rem);color:#fff;letter-spacing:.06em;text-align:center;padding:1rem;text-shadow:0 2px 12px rgba(0,0,0,.25)}
.artis-feat__visual img{width:100%;height:100%;object-fit:cover}

/* 実績グリッド */
.clients{display:grid;gap:1rem;grid-template-columns:repeat(auto-fill,minmax(220px,1fr))}
.client{background:#fff;border:1px solid var(--line);border-radius:10px;padding:1.2rem 1.3rem;transition:.2s}
.client:hover{border-color:var(--red-600);transform:translateY(-2px)}
.client .nm{font-family:var(--serif);font-size:1rem;color:var(--ink-900);font-weight:600;line-height:1.4}
.client .ct{font-size:.78rem;color:var(--red-600);margin-top:.3rem;font-weight:700}

/* CTA */
.cta{background:linear-gradient(120deg,var(--ink-900),var(--red-700));color:#fff;text-align:center}
.cta h2{font-family:var(--serif);font-size:clamp(1.5rem,3.4vw,2.3rem);margin-bottom:1rem}
.cta p{color:#e6e2df;margin-bottom:1.5rem;max-width:600px;margin-inline:auto}
.cta__info{display:flex;gap:2rem;justify-content:center;flex-wrap:wrap;margin-bottom:2rem;font-size:.94rem}
.cta__info b{color:var(--gold);font-family:var(--serif);margin-right:.5rem}

/* 下層ページヘッダー */
.page-hero{padding:calc(var(--header-h) + 3.5rem) 0 3rem;background:linear-gradient(150deg,#23252d,var(--red-700));color:#fff;text-align:center}
.page-hero .en{font-size:.74rem;letter-spacing:.3em;color:#f3b9c1;font-weight:700}
.page-hero h1{font-family:var(--serif);font-size:clamp(1.8rem,4.4vw,2.9rem);font-weight:600;margin-top:.6rem}
.breadcrumb{margin-top:1rem;font-size:.76rem;color:#e7c3c9}
.breadcrumb a:hover{color:#fff}.breadcrumb span{margin:0 .5rem;opacity:.6}

/* ARTiS 商品PR（bynaillabo風） */
.artis-hero{background:linear-gradient(160deg,#efe9e4 0%,#e3d8ce 100%);text-align:center;padding:calc(var(--header-h) + 3.5rem) 0 3.5rem}
.artis-hero .k{font-size:.74rem;letter-spacing:.34em;color:var(--red-600);font-weight:700}
.artis-hero h1{font-family:var(--serif);font-size:clamp(2rem,5vw,3.2rem);color:var(--ink-900);margin:.8rem 0 .4rem;letter-spacing:.04em}
.artis-hero .sub{color:var(--ink-600);letter-spacing:.1em}
.feat-rows{display:flex;flex-direction:column;gap:clamp(2rem,5vw,3.5rem)}
.feat-row{display:grid;grid-template-columns:1fr 1fr;gap:clamp(1.5rem,4vw,3rem);align-items:center}
.feat-row:nth-child(even) .feat-row__img{order:2}
.feat-row__img{aspect-ratio:4/3;border-radius:var(--radius);background:linear-gradient(150deg,#efe9e4,#d9cec4);display:grid;place-items:center;overflow:hidden}
.feat-row__img .wm{font-family:var(--serif);color:#fff;font-size:1.3rem;text-shadow:0 2px 10px rgba(0,0,0,.2);text-align:center;padding:1rem}
.feat-row__img img{width:100%;height:100%;object-fit:cover}
.feat-row__body h3{font-family:var(--serif);font-size:clamp(1.2rem,2.6vw,1.6rem);color:var(--ink-900);margin-bottom:.8rem}
.feat-row__body p{color:var(--ink-600)}
.buybar{background:var(--ink-900);color:#fff;text-align:center;border-radius:var(--radius);padding:clamp(2rem,4vw,3rem)}
.buybar h2{font-family:var(--serif);font-size:clamp(1.4rem,3vw,2rem);margin-bottom:.6rem}
.buybar p{color:#c7cad3;margin-bottom:1.5rem}
.buybar .note{font-size:.8rem;color:var(--ink-400);margin-top:1rem}

/* reveal */
.reveal{opacity:0;transform:translateY(22px);transition:opacity .7s,transform .7s}
.reveal.in{opacity:1;transform:none}

/* フッター */
.footer{background:var(--ink-900);color:#a7abb6;padding:clamp(2.5rem,5vw,3.5rem) 0 2rem;font-size:.88rem}
.footer__top{display:flex;justify-content:space-between;gap:2rem;flex-wrap:wrap;padding-bottom:2rem;border-bottom:1px solid rgba(255,255,255,.1)}
.footer__brand b{display:block;font-family:var(--serif);color:#fff;font-size:1.02rem;margin-bottom:.6rem}
.footer__nav{display:flex;gap:1.6rem;flex-wrap:wrap}
.footer__nav a:hover{color:#fff}
.footer__bottom{padding-top:1.6rem;text-align:center;color:#6f7480;font-size:.8rem}

@media(max-width:900px){
  .artis-feat,.feat-row{grid-template-columns:1fr}
  .feat-row:nth-child(even) .feat-row__img{order:0}
  .stbar{grid-template-columns:1fr 1fr}.st:nth-child(3){border-left:0}
}
@media(max-width:760px){
  .nav{position:fixed;inset:var(--header-h) 0 auto 0;flex-direction:column;align-items:flex-start;gap:0;background:#fff;padding:.5rem 6%;transform:translateY(-140%);transition:transform .35s;box-shadow:0 20px 40px rgba(0,0,0,.12)}
  .nav.open{transform:translateY(0)}
  .nav a{width:100%;padding:1rem 0;border-bottom:1px solid var(--line)}
  .nav .langswitch{margin:.8rem 0}
  .nav-toggle{display:block}
  .stbar{grid-template-columns:1fr}.st{border-left:0}
}