/*
Theme Name: RIU Original Theme
Theme URI: https://riu-inc.co.jp
Author: RIU INC.
Description: 里羽株式会社 コーポレートサイト用フルオリジナルテーマ。墨藍×翡翠、日英中（繁体字）三言語対応。
Version: 1.2.0
Requires PHP: 7.4
License: Proprietary
Text Domain: riu
*/

:root{
  --ink:      #0A1522;   /* 墨藍：基調の深い藍 */
  --ink-2:    #0F2136;   /* 藍：面の階調 */
  --paper:    #F4F6F5;   /* 白磁：明部の地 */
  --text:     #1B2836;   /* 明部の文字色 */
  --steel:    #8DA2B5;   /* 暗部の補助文字 */
  --jade:     #2EE6B6;   /* 翡翠ネオン：AI×台湾の玉 */
  --jade-dim: rgba(46,230,182,.14);
  --line-d:   rgba(141,162,181,.22);
  --line-l:   rgba(27,40,54,.14);
  --serif: "Shippori Mincho", serif;
  --sans:  "Zen Kaku Gothic New", sans-serif;
  --mono:  "Space Grotesk", sans-serif;
  --max: 1160px;
}
/* 繁体字中国語モード：CJKフォントを台湾向けに切替 */
body.lang-zh{
  --serif: "Noto Serif TC", "Shippori Mincho", serif;
  --sans:  "Noto Sans TC", "Zen Kaku Gothic New", sans-serif;
}
*{margin:0;padding:0;box-sizing:border-box}
html{scroll-behavior:smooth}
body{
  font-family:var(--sans);
  background:var(--ink);
  color:var(--paper);
  line-height:1.9;
  font-size:15.5px;
  letter-spacing:.02em;
  -webkit-font-smoothing:antialiased;
  overflow-x:hidden;
}
img,svg{display:block;max-width:100%;height:auto}
a{color:inherit;text-decoration:none}
.wrap{max-width:var(--max);margin:0 auto;padding:0 clamp(20px,4vw,48px)}

/* ---- 共通：英字ラベル（eyebrow） ---- */
.eyebrow{
  font-family:var(--mono);
  font-size:11.5px;
  letter-spacing:.34em;
  text-transform:uppercase;
  color:var(--jade);
  display:flex;align-items:center;gap:14px;
}
.eyebrow::before{content:"";width:34px;height:1px;background:var(--jade);opacity:.7}

/* ---- 共通：見出し ---- */
.h-sec{
  font-family:var(--serif);
  font-weight:600;
  font-size:clamp(26px,3.4vw,40px);
  line-height:1.55;
  letter-spacing:.06em;
  margin-top:18px;
}

/* ---- スクロール連動リビール ---- */
.rv{opacity:0;transform:translateY(26px);transition:opacity .9s cubic-bezier(.22,1,.36,1),transform .9s cubic-bezier(.22,1,.36,1)}
.rv.is-in{opacity:1;transform:none}
.rv-d1{transition-delay:.12s}.rv-d2{transition-delay:.24s}.rv-d3{transition-delay:.36s}

/* =========================================================
   Header
========================================================= */
.site-head{
  position:fixed;inset:0 0 auto 0;z-index:100;
  display:flex;align-items:center;justify-content:space-between;
  padding:20px clamp(20px,4vw,48px);
  transition:background .4s,backdrop-filter .4s,padding .4s,border-color .4s;
  border-bottom:1px solid transparent;
}
.site-head.is-scrolled{
  background:rgba(10,21,34,.82);
  backdrop-filter:blur(14px);
  padding:13px clamp(20px,4vw,48px);
  border-bottom-color:var(--line-d);
}
.brand{display:flex;align-items:center;gap:12px}
.brand-name{display:flex;flex-direction:column;line-height:1.25}
.brand-name .ja{font-family:var(--serif);font-size:17px;letter-spacing:.14em;font-weight:600}
.brand-name .en{font-family:var(--mono);font-size:9.5px;letter-spacing:.3em;color:var(--steel)}
.gnav{display:flex;align-items:center;gap:clamp(16px,2.4vw,30px)}
.gnav a.nav-link{
  font-size:13px;letter-spacing:.12em;color:var(--paper);
  position:relative;padding:4px 0;opacity:.85;transition:opacity .3s;
}
.gnav a.nav-link::after{
  content:"";position:absolute;left:0;bottom:0;width:100%;height:1px;
  background:var(--jade);transform:scaleX(0);transform-origin:right;transition:transform .35s;
}
.gnav a.nav-link:hover{opacity:1}
.gnav a.nav-link:hover::after{transform:scaleX(1);transform-origin:left}
.lang{
  display:flex;gap:2px;font-family:var(--mono);font-size:11px;
  border:1px solid var(--line-d);border-radius:999px;padding:3px;
}
.lang button{
  all:unset;cursor:pointer;padding:3px 11px;border-radius:999px;
  color:var(--steel);letter-spacing:.08em;transition:.3s;
}
.lang button.on{background:var(--jade);color:var(--ink);font-weight:600}
.lang button:not(.on):hover{color:var(--paper)}
.btn-contact{
  font-size:12.5px;letter-spacing:.16em;
  border:1px solid var(--jade);color:var(--jade);
  padding:9px 22px;border-radius:999px;transition:.35s;white-space:nowrap;
}
.btn-contact:hover{background:var(--jade);color:var(--ink);box-shadow:0 0 22px rgba(46,230,182,.35)}

/* =========================================================
   Hero
========================================================= */
.hero{position:relative;min-height:100svh;display:flex;align-items:center;overflow:hidden}
#strait{position:absolute;inset:0;width:100%;height:100%}
.hero::after{
  content:"";position:absolute;inset:auto 0 0 0;height:180px;
  background:linear-gradient(to bottom,transparent,var(--ink));pointer-events:none;
}
.hero-inner{
  position:relative;z-index:2;width:100%;
  display:flex;align-items:flex-end;justify-content:space-between;gap:40px;
  padding-top:120px;padding-bottom:90px;
}
.hero-copy{display:flex;gap:clamp(20px,3vw,36px);align-items:flex-start}
.tate{
  writing-mode:vertical-rl;
  font-family:var(--serif);font-weight:600;
  font-size:clamp(38px,5.6vw,64px);
  line-height:1.9;letter-spacing:.22em;
  height:clamp(340px,52vh,520px);
  text-shadow:0 0 60px rgba(46,230,182,.12);
}
/* 英語表示時は縦書きを解除 */
body.lang-en .tate{
  writing-mode:horizontal-tb;height:auto;
  font-size:clamp(34px,4.6vw,58px);line-height:1.5;letter-spacing:.04em;
  max-width:560px;
}
.tate .accent{color:var(--jade)}
.hero-sub{align-self:flex-end;max-width:360px}
.hero-sub p{font-size:14px;color:var(--steel);line-height:2.2}
.hero-sub .tags{display:flex;flex-wrap:wrap;gap:8px;margin-top:22px}
.hero-sub .tags span{
  font-family:var(--mono);font-size:10.5px;letter-spacing:.18em;
  border:1px solid var(--line-d);border-radius:999px;padding:5px 13px;color:var(--steel);
}
.hero-meta{
  position:absolute;z-index:2;left:clamp(20px,4vw,48px);bottom:34px;
  font-family:var(--mono);font-size:10.5px;letter-spacing:.26em;color:var(--steel);
  display:flex;gap:26px;align-items:center;
}
.scroll-cue{
  position:absolute;z-index:2;right:clamp(20px,4vw,48px);bottom:0;
  display:flex;flex-direction:column;align-items:center;gap:12px;
  font-family:var(--mono);font-size:10px;letter-spacing:.3em;color:var(--steel);
  writing-mode:vertical-rl;
}
.scroll-cue::after{
  content:"";width:1px;height:70px;background:linear-gradient(var(--jade),transparent);
  animation:cue 2.2s ease-in-out infinite;
}
@keyframes cue{0%{transform:scaleY(0);transform-origin:top}45%{transform:scaleY(1);transform-origin:top}55%{transform:scaleY(1);transform-origin:bottom}100%{transform:scaleY(0);transform-origin:bottom}}

/* =========================================================
   Statement
========================================================= */
.statement{position:relative;padding:clamp(90px,12vw,150px) 0}
.st-grid{display:grid;grid-template-columns:minmax(0,1fr) minmax(0,1.15fr);gap:clamp(36px,6vw,90px);align-items:start}
.st-kanji{position:relative}
.st-kanji .big{
  font-family:var(--serif);font-weight:700;
  font-size:clamp(120px,18vw,220px);line-height:1;letter-spacing:.04em;
  color:transparent;-webkit-text-stroke:1px rgba(141,162,181,.4);
  user-select:none;
}
.st-kanji .big b{color:var(--jade);-webkit-text-stroke:0;font-weight:700;opacity:.9}
.st-kanji .yomi{font-family:var(--mono);font-size:11px;letter-spacing:.4em;color:var(--steel);margin-top:14px}
.statement p.lead{
  font-family:var(--serif);font-size:clamp(19px,2.2vw,25px);
  line-height:2.3;letter-spacing:.08em;font-weight:500;
}
.statement p.body{margin-top:26px;color:var(--steel);font-size:14.5px;line-height:2.3}
.statement p.body em{font-style:normal;color:var(--paper);border-bottom:1px solid var(--jade)}

/* =========================================================
   Services
========================================================= */
.services{background:var(--paper);color:var(--text);padding:clamp(90px,12vw,150px) 0;position:relative}
.services .eyebrow{color:#0d9c7c}
.services .eyebrow::before{background:#0d9c7c}
.sv-head{display:flex;justify-content:space-between;align-items:flex-end;gap:30px;flex-wrap:wrap}
.sv-head p{max-width:460px;color:#5a6b7c;font-size:14px}
.sv-list{margin-top:clamp(40px,6vw,70px);border-top:1px solid var(--line-l)}
.sv-item{
  display:grid;grid-template-columns:110px minmax(0,1fr) minmax(0,1.4fr) 40px;
  gap:clamp(16px,3vw,40px);align-items:center;
  padding:clamp(28px,4vw,44px) 0;border-bottom:1px solid var(--line-l);
  transition:background .4s;position:relative;
}
.sv-item:hover{background:rgba(46,230,182,.05)}
.sv-no{font-family:var(--mono);font-size:12px;letter-spacing:.2em;color:#8fa0ae}
.sv-status{
  display:inline-block;margin-top:10px;font-size:10.5px;letter-spacing:.14em;
  padding:3px 10px;border-radius:999px;white-space:nowrap;
}
.sv-status.now{background:#10312a;color:#5cf0c8}
.sv-status.next{border:1px solid #b7c3cd;color:#68798a}
.sv-item h3{font-family:var(--serif);font-size:clamp(20px,2.2vw,26px);font-weight:600;letter-spacing:.08em;line-height:1.6}
.sv-item h3 small{display:block;font-family:var(--mono);font-size:10.5px;letter-spacing:.26em;color:#8fa0ae;margin-top:8px;text-transform:uppercase}
.sv-item p{font-size:14px;color:#4c5d6e;line-height:2.1}
.sv-arrow{
  width:38px;height:38px;border:1px solid var(--line-l);border-radius:50%;
  display:grid;place-items:center;transition:.35s;color:#68798a;font-size:15px;
}
.sv-item:hover .sv-arrow{background:var(--jade);border-color:var(--jade);color:var(--ink);transform:translateX(4px)}

/* =========================================================
   Strengths
========================================================= */
.strengths{padding:clamp(90px,12vw,150px) 0;position:relative;background:linear-gradient(var(--ink),var(--ink-2))}
.stg-grid{
  margin-top:clamp(40px,6vw,70px);
  display:grid;grid-template-columns:repeat(2,minmax(0,1fr));gap:1px;
  background:var(--line-d);border:1px solid var(--line-d);
}
.stg-card{
  background:var(--ink);padding:clamp(30px,4vw,50px);
  position:relative;overflow:hidden;transition:background .4s;
}
.stg-card::before{
  content:"";position:absolute;inset:0;
  background:radial-gradient(420px 200px at var(--mx,50%) var(--my,50%),var(--jade-dim),transparent 70%);
  opacity:0;transition:opacity .4s;pointer-events:none;
}
.stg-card:hover::before{opacity:1}
.stg-card .icon{
  width:44px;height:44px;border:1px solid var(--line-d);border-radius:12px;
  display:grid;place-items:center;color:var(--jade);margin-bottom:22px;
}
.stg-card h3{font-family:var(--serif);font-size:19px;font-weight:600;letter-spacing:.08em;line-height:1.7}
.stg-card p{margin-top:14px;font-size:13.5px;color:var(--steel);line-height:2.1}
.stg-card .note{margin-top:14px;font-family:var(--mono);font-size:10.5px;letter-spacing:.2em;color:var(--jade);opacity:.85}

/* =========================================================
   Roadmap
========================================================= */
.roadmap{background:var(--paper);color:var(--text);padding:clamp(90px,12vw,150px) 0}
.roadmap .eyebrow{color:#0d9c7c}.roadmap .eyebrow::before{background:#0d9c7c}
.rm-line{margin-top:clamp(46px,7vw,80px);position:relative;padding-left:34px}
.rm-line::before{content:"";position:absolute;left:8px;top:6px;bottom:6px;width:1px;background:linear-gradient(#0d9c7c,rgba(27,40,54,.15))}
.rm-item{position:relative;padding-bottom:clamp(36px,5vw,56px)}
.rm-item:last-child{padding-bottom:0}
.rm-item::before{
  content:"";position:absolute;left:-30.5px;top:8px;width:10px;height:10px;border-radius:50%;
  background:var(--paper);border:2px solid #0d9c7c;box-shadow:0 0 0 5px rgba(13,156,124,.12);
}
.rm-item .when{font-family:var(--mono);font-size:11px;letter-spacing:.24em;color:#0d9c7c;text-transform:uppercase}
.rm-item h3{font-family:var(--serif);font-size:clamp(19px,2vw,23px);font-weight:600;letter-spacing:.06em;margin-top:8px}
.rm-item p{margin-top:8px;font-size:14px;color:#5a6b7c;max-width:640px;line-height:2.1}

/* =========================================================
   Company
========================================================= */
.company{padding:clamp(90px,12vw,150px) 0;background:var(--ink)}
.co-grid{display:grid;grid-template-columns:minmax(0,.9fr) minmax(0,1.4fr);gap:clamp(36px,6vw,90px);margin-top:10px}
.co-table{border-top:1px solid var(--line-d)}
.co-row{display:grid;grid-template-columns:170px 1fr;gap:20px;padding:20px 4px;border-bottom:1px solid var(--line-d)}
.co-row dt{font-size:12.5px;letter-spacing:.18em;color:var(--steel);padding-top:2px}
.co-row dd{font-size:14.5px;line-height:2}
.co-row dd .sub{color:var(--steel);font-size:12.5px}

/* =========================================================
   Contact / CTA
========================================================= */
.contact{position:relative;padding:clamp(100px,13vw,170px) 0;overflow:hidden;background:var(--ink-2)}
.contact::before{
  content:"";position:absolute;inset:-20%;
  background:radial-gradient(600px 340px at 70% 30%,rgba(46,230,182,.10),transparent 70%);
  pointer-events:none;
}
.ct-grid{position:relative;display:grid;grid-template-columns:minmax(0,1fr) minmax(0,1fr);gap:clamp(40px,6vw,90px)}
.ct-lead{font-family:var(--serif);font-size:clamp(24px,3vw,34px);font-weight:600;line-height:1.9;letter-spacing:.08em;margin-top:18px}
.ct-copy{margin-top:20px;color:var(--steel);font-size:14px;line-height:2.2;max-width:420px}
.ct-mail{margin-top:30px;font-family:var(--mono);font-size:13px;letter-spacing:.14em;color:var(--jade);display:inline-flex;gap:10px;align-items:center}
.form label{display:block;font-size:12px;letter-spacing:.16em;color:var(--steel);margin:0 0 8px}
.form .field{margin-bottom:22px}
.form input,.form select,.form textarea{
  width:100%;background:rgba(244,246,245,.04);border:1px solid var(--line-d);
  border-radius:8px;color:var(--paper);font-family:var(--sans);font-size:14px;
  padding:13px 15px;transition:border-color .3s,box-shadow .3s;
}
.form input:focus,.form select:focus,.form textarea:focus{
  outline:none;border-color:var(--jade);box-shadow:0 0 0 3px rgba(46,230,182,.14);
}
.form textarea{min-height:130px;resize:vertical}
.form select{appearance:none;background-image:linear-gradient(45deg,transparent 50%,var(--steel) 50%),linear-gradient(135deg,var(--steel) 50%,transparent 50%);background-position:calc(100% - 20px) 50%,calc(100% - 15px) 50%;background-size:5px 5px;background-repeat:no-repeat}
.form select option{background:var(--ink-2);color:var(--paper)}
.btn-send{
  all:unset;cursor:pointer;display:inline-flex;align-items:center;gap:12px;
  font-size:13.5px;letter-spacing:.2em;font-weight:600;
  background:var(--jade);color:var(--ink);padding:15px 36px;border-radius:999px;
  transition:.35s;
}
.btn-send:hover{box-shadow:0 0 30px rgba(46,230,182,.45);transform:translateY(-2px)}
.form .demo-note{margin-top:16px;font-size:11.5px;color:var(--steel);letter-spacing:.06em}

/* =========================================================
   下層ページ（固定ページ・投稿用の汎用スタイル）
========================================================= */
.page-plain{background:var(--paper);color:var(--text);padding:170px 0 120px;min-height:70vh}
.page-plain .page-title{font-family:var(--serif);font-weight:600;font-size:clamp(28px,4vw,44px);letter-spacing:.08em;line-height:1.6}
.page-plain .page-body{margin-top:40px;max-width:760px;font-size:15px;line-height:2.2;color:#3a4a5a}
.page-plain .page-body h2{font-family:var(--serif);font-size:24px;margin:48px 0 16px;letter-spacing:.06em}
.page-plain .page-body h3{font-family:var(--serif);font-size:19px;margin:36px 0 12px}
.page-plain .page-body p{margin:0 0 22px}
.page-plain .page-body a{color:#0d9c7c;border-bottom:1px solid currentColor}
.page-plain .page-body ul,.page-plain .page-body ol{margin:0 0 22px 24px}
.page-plain .page-body img{border-radius:10px}

/* =========================================================
   Footer
========================================================= */
.site-foot{background:var(--ink);border-top:1px solid var(--line-d);padding:44px 0 30px}
.ft-in{display:flex;justify-content:space-between;align-items:center;gap:24px;flex-wrap:wrap}
.ft-nav{display:flex;gap:22px;font-size:12px;letter-spacing:.12em;color:var(--steel)}
.ft-nav a:hover{color:var(--jade)}
.ft-copy{font-family:var(--mono);font-size:10.5px;letter-spacing:.2em;color:var(--steel)}

/* =========================================================
   Responsive
========================================================= */
@media(max-width:960px){
  .st-grid,.co-grid,.ct-grid{grid-template-columns:1fr}
  .sv-item{grid-template-columns:1fr;gap:12px}
  .sv-arrow{display:none}
  .stg-grid{grid-template-columns:1fr}
}
@media(max-width:760px){
  .gnav .nav-link{display:none}
  .hero-inner{flex-direction:column;align-items:flex-start;justify-content:center;padding-top:110px}
  .tate{writing-mode:horizontal-tb;height:auto;font-size:clamp(30px,9vw,44px);line-height:1.8;letter-spacing:.12em}
  .hero-sub{align-self:flex-start;margin-top:30px}
  .hero-meta{display:none}
  .co-row{grid-template-columns:1fr;gap:4px;padding:16px 2px}
}

/* ---- Reduced motion ---- */
@media(prefers-reduced-motion:reduce){
  html{scroll-behavior:auto}
  .rv{opacity:1;transform:none;transition:none}
  .scroll-cue::after{animation:none}
}

/* =========================================================
   Contact Form 7 対応（v1.1）
========================================================= */
.wpcf7 .field .wpcf7-form-control-wrap{display:block}
.wpcf7-not-valid-tip{display:block;margin-top:6px;font-size:11.5px;color:#ff9c9c;letter-spacing:.04em}
.wpcf7 form .wpcf7-response-output{
  margin:18px 0 0;padding:12px 16px;border:1px solid var(--line-d);
  border-radius:8px;font-size:12.5px;color:var(--paper);line-height:1.8;
}
.wpcf7 form.sent .wpcf7-response-output{border-color:var(--jade);color:var(--jade)}
.wpcf7 form.invalid .wpcf7-response-output,
.wpcf7 form.failed .wpcf7-response-output,
.wpcf7 form.aborted .wpcf7-response-output{border-color:#ff9c9c;color:#ff9c9c}
.wpcf7-spinner{margin:0 0 0 12px;vertical-align:middle}