/* ============================================================
   Tetchord — code & chord
   ============================================================ */
:root{
  --navy:#162350;
  --navy-2:#1c2c5e;
  --navy-3:#26397a;
  --seafoam:#8fdcc6;
  --seafoam-2:#1f9e82;
  --ink:#eef3f8;
  --gray:#93a1bf;
  --paper:#f4f8f7;
  --paper-ink:#101826;
  --font-display:"Sora",system-ui,sans-serif;
  --font-mono:"JetBrains Mono","Consolas",monospace;
  --font-ja:"Noto Sans JP",system-ui,sans-serif;
  --ease:cubic-bezier(.22,1,.36,1);
}

*{margin:0;padding:0;box-sizing:border-box}
html{scroll-behavior:smooth}
body{
  font-family:var(--font-ja);
  background:var(--navy);
  color:var(--ink);
  line-height:1.85;
  overflow-x:hidden;
  -webkit-font-smoothing:antialiased;
}
img{max-width:100%;display:block}
a{color:inherit;text-decoration:none}
ul{list-style:none}
.container{width:min(1120px,92%);margin-inline:auto}
.section{position:relative;padding:clamp(80px,11vw,140px) 0}
.sp{display:none}
@media(max-width:768px){.sp{display:inline}}

::selection{background:var(--seafoam);color:var(--navy)}

/* ---------- ロゴ ---------- */
.logo-word{height:34px;width:auto;display:block}
.logo-word--lg{height:46px}
.emblem{height:40px;width:auto;display:block;border-radius:9px}

/* ---------- eyebrow label ---------- */
.eyebrow{
  display:inline-flex;align-items:center;gap:14px;
  font-family:var(--font-mono);font-weight:500;font-size:12px;letter-spacing:.28em;
  color:var(--seafoam);text-transform:uppercase;
}
.eyebrow::before{content:"";width:26px;height:1px;background:var(--seafoam);opacity:.7}

.reveal{opacity:0;transform:translateY(36px);transition:opacity .9s var(--ease),transform .9s var(--ease);transition-delay:var(--d,0s)}
.reveal.is-visible{opacity:1;transform:none}

.btn{
  display:inline-block;padding:14px 34px;border-radius:99px;font-weight:700;font-size:15px;
  transition:transform .35s var(--ease),box-shadow .35s,background .35s,color .35s,border-color .35s;
}
.btn--fill{background:linear-gradient(135deg,var(--seafoam-2),var(--seafoam));color:var(--navy)}
.btn--fill:hover{transform:translateY(-3px);box-shadow:0 14px 34px rgba(61,220,154,.32)}
.btn--ghost{border:1px solid rgba(238,243,248,.35);color:var(--ink)}
.btn--ghost:hover{background:rgba(238,243,248,.08);transform:translateY(-3px)}

/* ============================================================
   Header
   ============================================================ */
.header{
  position:fixed;top:0;left:0;right:0;z-index:100;
  display:flex;align-items:center;justify-content:space-between;
  padding:16px clamp(20px,4vw,48px);
  transition:background .4s,backdrop-filter .4s,padding .4s,box-shadow .4s;
}
.header.is-scrolled{
  background:rgba(12,20,40,.85);backdrop-filter:blur(14px);
  padding-block:11px;box-shadow:0 1px 0 rgba(61,220,154,.16);
}
.header__logo{display:flex;align-items:center}

.gnav{display:flex;align-items:center;gap:clamp(14px,2.2vw,30px);font-size:14px;font-weight:500}
.gnav a{position:relative;padding:4px 0;opacity:.85;transition:opacity .3s}
.gnav a:hover{opacity:1}
.gnav a:not(.gnav__cta)::after{
  content:"";position:absolute;left:0;bottom:0;width:100%;height:2px;
  background:var(--seafoam);transform:scaleX(0);transform-origin:right;transition:transform .35s var(--ease);
}
.gnav a:not(.gnav__cta):hover::after{transform:scaleX(1);transform-origin:left}
.gnav__cta{
  background:var(--seafoam);color:var(--navy)!important;
  padding:9px 22px!important;border-radius:99px;font-weight:700;
  transition:transform .3s var(--ease),box-shadow .3s;
}
.gnav__cta:hover{transform:translateY(-2px);box-shadow:0 8px 24px rgba(61,220,154,.35)}
.menu-btn{display:none}

@media(max-width:880px){
  .menu-btn{
    display:flex;flex-direction:column;justify-content:center;gap:6px;
    width:44px;height:44px;padding:0 9px;background:none;border:0;cursor:pointer;z-index:110;
  }
  .menu-btn span{display:block;height:2px;background:var(--ink);transition:transform .35s var(--ease),opacity .3s}
  .menu-btn.is-open span:nth-child(1){transform:translateY(4px) rotate(45deg)}
  .menu-btn.is-open span:nth-child(2){transform:translateY(-4px) rotate(-45deg)}
  .gnav{
    position:fixed;inset:0;background:rgba(12,20,40,.97);backdrop-filter:blur(18px);
    flex-direction:column;justify-content:center;gap:28px;font-size:19px;
    opacity:0;visibility:hidden;transition:opacity .4s,visibility .4s;
  }
  .gnav.is-open{opacity:1;visibility:visible}
}

/* ============================================================
   Hero
   ============================================================ */
.hero{
  position:relative;min-height:100svh;display:flex;align-items:center;overflow:hidden;
  background:
    radial-gradient(120% 90% at 78% 8%,rgba(38,57,122,.42) 0%,rgba(28,44,94,.58) 42%,rgba(22,35,80,.8) 100%),
    url("../assets/img/hero-waveform-code.jpg") center/cover no-repeat;
}
.hero__canvas{position:absolute;inset:0;width:100%;height:100%;opacity:.8}
.hero__grid{
  position:absolute;inset:0;pointer-events:none;
  background-image:linear-gradient(rgba(61,220,154,.05) 1px,transparent 1px),linear-gradient(90deg,rgba(61,220,154,.05) 1px,transparent 1px);
  background-size:70px 70px;
  mask-image:radial-gradient(80% 70% at 60% 40%,#000 30%,transparent 100%);
}
.hero__inner{position:relative;z-index:2;width:min(1120px,92%);margin-inline:auto;padding-top:64px}
.hero__eyebrow{opacity:0;animation:fadeUp 1s .5s var(--ease) forwards}
.hero__title{
  font-family:var(--font-display);font-weight:800;
  font-size:clamp(32px,6.4vw,68px);
  line-height:1.32;letter-spacing:-.01em;margin:22px 0 22px;
  opacity:0;animation:fadeUp 1s .7s var(--ease) forwards;
}
.hero__title em{font-style:normal;color:var(--seafoam)}
.hero__lead{
  max-width:640px;font-size:clamp(14.5px,1.6vw,17px);color:#c3cee4;
  opacity:0;animation:fadeUp 1s .95s var(--ease) forwards;
}
.hero__actions{display:flex;gap:16px;margin-top:36px;flex-wrap:wrap;opacity:0;animation:fadeUp 1s 1.15s var(--ease) forwards}
@keyframes fadeUp{from{opacity:0;transform:translateY(24px)}to{opacity:1;transform:none}}

.hero__stats{
  display:flex;gap:clamp(28px,4vw,60px);margin-top:60px;flex-wrap:wrap;
  opacity:0;animation:fadeUp 1s 1.35s var(--ease) forwards;
}
.hero__stat b{
  font-family:var(--font-display);font-weight:800;font-size:clamp(30px,3.6vw,42px);
  color:var(--seafoam);display:block;line-height:1;
}
.hero__stat span{font-size:12.5px;color:var(--gray);letter-spacing:.04em;display:block;margin-top:8px}

.hero__scroll{
  position:absolute;bottom:44px;left:50%;transform:translateX(-50%);z-index:3;
  display:flex;flex-direction:column;align-items:center;gap:10px;
  font-family:var(--font-mono);font-size:10px;letter-spacing:.3em;color:var(--seafoam);
}
.hero__scroll i{width:1px;height:44px;background:rgba(61,220,154,.25);position:relative;overflow:hidden}
.hero__scroll i::after{content:"";position:absolute;top:-40%;left:0;width:100%;height:40%;background:var(--seafoam);animation:scrollLine 1.8s ease-in-out infinite}
@keyframes scrollLine{to{top:110%}}

/* ============================================================
   共通 見出し
   ============================================================ */
.sec-head{margin-bottom:clamp(44px,6vw,68px)}
.sec-head .eyebrow{margin-bottom:16px}
.sec-head__ja{
  font-family:var(--font-display);font-weight:800;
  font-size:clamp(24px,3.8vw,38px);line-height:1.45;letter-spacing:-.01em;
}
.sec-head__note{margin-top:16px;max-width:600px;font-size:15px;color:var(--gray)}
.sec-head--light .sec-head__ja{color:var(--paper-ink)}
.sec-head--light .sec-head__note{color:#5c6b85}

/* ============================================================
   Philosophy
   ============================================================ */
.philosophy{
  background:
    linear-gradient(180deg,rgba(22,35,80,.88),rgba(28,44,94,.55) 45%,rgba(22,35,80,.9)),
    url("../assets/img/philosophy-hands-laptop.jpg") center/cover no-repeat;
}
.phi__grid{display:grid;grid-template-columns:repeat(3,1fr);gap:clamp(18px,2.4vw,26px)}
@media(max-width:900px){.phi__grid{grid-template-columns:1fr}}
.phi-card{
  border-radius:20px;padding:32px 28px 34px;
  background:rgba(255,255,255,.035);border:1px solid rgba(61,220,154,.14);
  transition:transform .5s var(--ease),border-color .5s;
}
.phi-card:hover{transform:translateY(-8px);border-color:rgba(61,220,154,.4)}
.phi-card__num{font-family:var(--font-mono);font-size:13px;letter-spacing:.2em;color:var(--seafoam)}
.phi-card__title{font-family:var(--font-display);font-weight:800;font-size:20px;margin:14px 0 14px}
.phi-card__desc{font-size:14px;color:#b7c3dc;line-height:1.9}

/* ============================================================
   Services
   ============================================================ */
.services{background:var(--paper);color:var(--paper-ink)}
.svc__list{display:grid;gap:18px}
.svc{
  display:grid;grid-template-columns:auto 1fr auto;gap:28px;align-items:center;
  background:#fff;border-radius:18px;padding:28px clamp(22px,3vw,36px);
  box-shadow:0 8px 30px rgba(16,24,38,.06);
  border-left:4px solid var(--svc-color,var(--seafoam-2));
  transition:transform .45s var(--ease),box-shadow .45s;
}
.svc:hover{transform:translateY(-6px);box-shadow:0 20px 44px rgba(16,24,38,.12)}
.svc__lead{display:flex;flex-direction:column;align-items:center;gap:12px}
.svc__icon{
  width:64px;height:64px;object-fit:cover;border-radius:16px;
  box-shadow:0 4px 14px rgba(16,24,38,.1);
}
.svc__num{font-family:var(--font-mono);font-weight:700;font-size:26px;color:var(--svc-color,var(--seafoam-2))}
.svc__title{font-family:var(--font-display);font-weight:800;font-size:19px;margin-bottom:8px}
.svc__title span{
  display:block;font-family:var(--font-mono);font-weight:500;font-size:10.5px;letter-spacing:.2em;
  text-transform:uppercase;color:var(--svc-color,var(--seafoam-2));margin-bottom:6px;
}
.svc__desc{font-size:14px;color:#5c6b85;line-height:1.85;max-width:520px}
.svc__phase{
  font-family:var(--font-mono);font-size:11px;letter-spacing:.12em;color:#8a97ad;
  text-align:right;white-space:nowrap;
}
@media(max-width:680px){
  .svc{grid-template-columns:auto 1fr}
  .svc__phase{grid-column:1/-1;text-align:left;margin-top:6px}
}

.pricing{
  margin-top:clamp(48px,6vw,72px);background:var(--navy);color:var(--ink);
  border-radius:22px;padding:clamp(32px,4vw,52px);
  display:grid;grid-template-columns:1.1fr 1fr;gap:clamp(28px,4vw,56px);align-items:center;
}
@media(max-width:760px){.pricing{grid-template-columns:1fr}}
.pricing__title{font-family:var(--font-display);font-weight:800;font-size:clamp(20px,2.4vw,26px);margin-bottom:14px}
.pricing__text{font-size:14.5px;color:#b7c3dc;line-height:1.9}
.pricing__badges{display:flex;flex-direction:column;gap:14px}
.pricing__badge{
  display:flex;align-items:center;gap:14px;padding:16px 20px;border-radius:14px;
  background:rgba(61,220,154,.08);border:1px solid rgba(61,220,154,.22);
}
.pricing__badge b{font-family:var(--font-display);font-weight:800;color:var(--seafoam);font-size:15px}
.pricing__badge span{font-size:13px;color:var(--gray)}

/* ============================================================
   Apps(アプリでできること)
   ============================================================ */
.apps{background:var(--paper);color:var(--paper-ink)}

.beforeafter{
  background:var(--navy);color:var(--ink);
  border-radius:22px;padding:clamp(32px,4vw,52px);
  display:grid;grid-template-columns:1fr auto 1fr;gap:clamp(20px,3vw,36px);align-items:center;
}
@media(max-width:760px){.beforeafter{grid-template-columns:1fr}}
.beforeafter__tag{
  font-family:var(--font-mono);font-size:11.5px;letter-spacing:.22em;text-transform:uppercase;
  margin-bottom:10px;
}
.beforeafter__col--before .beforeafter__tag{color:var(--gray)}
.beforeafter__col--after .beforeafter__tag{color:var(--seafoam)}
.beforeafter__text{font-size:14.5px;line-height:1.9;color:#c3cee4}
.beforeafter__col--before .beforeafter__text{color:#93a1bf}
.beforeafter__arrow{
  font-family:var(--font-display);font-weight:800;font-size:24px;color:var(--seafoam);
  justify-self:center;
}
@media(max-width:760px){.beforeafter__arrow{transform:rotate(90deg)}}

.apps__note{
  margin-top:clamp(28px,4vw,40px);max-width:640px;
  font-size:14.5px;color:#5c6b85;line-height:1.9;
}
.apps__cta{margin-top:clamp(24px,3vw,34px);display:flex;flex-direction:column;align-items:flex-start;gap:12px}
.apps__cta-note{font-size:12.5px;color:#8a97ad}

/* ============================================================
   Works
   ============================================================ */
.works{background:linear-gradient(180deg,var(--navy),var(--navy-2) 60%,var(--navy))}
.works__grid{display:grid;grid-template-columns:repeat(3,1fr);gap:clamp(18px,2.4vw,26px)}
@media(max-width:1020px){.works__grid{grid-template-columns:1fr}}
.work{
  border-radius:20px;overflow:hidden;
  background:rgba(255,255,255,.04);border:1px solid rgba(61,220,154,.14);
  transition:transform .5s var(--ease),border-color .5s,box-shadow .5s;
  display:flex;flex-direction:column;
}
.work:hover{transform:translateY(-8px);border-color:rgba(61,220,154,.4);box-shadow:0 24px 50px rgba(6,10,20,.5)}
.work__tag{
  font-family:var(--font-mono);font-size:10.5px;letter-spacing:.2em;color:var(--seafoam);
  padding:20px 24px 0;text-transform:uppercase;
}
.work__body{padding:12px 24px 28px;flex:1;display:flex;flex-direction:column}
.work__title{font-family:var(--font-display);font-weight:800;font-size:18px;margin-bottom:12px}
.work__desc{font-size:13.5px;color:#b7c3dc;line-height:1.85;flex:1}
.work__meta{margin-top:16px;font-size:12px;color:var(--gray);letter-spacing:.03em}
.work__link{
  display:inline-flex;align-items:center;gap:8px;margin-top:20px;
  font-family:var(--font-mono);font-size:12px;letter-spacing:.05em;color:var(--seafoam);
  border-bottom:1px solid rgba(143,220,198,.35);padding-bottom:4px;align-self:flex-start;
  transition:border-color .3s,color .3s;
}
.work__link:hover{color:var(--seafoam-2);border-color:var(--seafoam-2)}

.works__more{
  display:flex;align-items:center;justify-content:space-between;gap:20px;flex-wrap:wrap;
  margin-top:clamp(36px,5vw,52px);padding:26px 32px;border-radius:20px;
  background:linear-gradient(135deg,var(--seafoam-2),var(--seafoam));color:var(--navy);
  box-shadow:0 20px 50px rgba(31,158,130,.28);
  transition:transform .4s var(--ease),box-shadow .4s;
}
.works__more:hover{transform:translateY(-4px);box-shadow:0 26px 60px rgba(31,158,130,.4)}
.works__more-label{display:block;font-family:var(--font-display);font-weight:800;font-size:clamp(16px,2vw,19px)}
.works__more-sub{display:block;margin-top:5px;font-size:12.5px;color:rgba(16,24,38,.72)}

.works__more-cta{
  display:inline-flex;align-items:center;gap:9px;flex-shrink:0;
  padding:13px 24px;border-radius:99px;background:var(--navy);color:var(--seafoam);
  font-family:var(--font-display);font-weight:800;font-size:14px;white-space:nowrap;
  transition:background .35s;
}
.works__more:hover .works__more-cta{background:#0c1428}
.works__more-arrow{display:inline-block;font-weight:800;animation:ctaBounce 1.4s ease-in-out infinite}
@keyframes ctaBounce{0%,50%,100%{transform:translateX(0)}25%{transform:translateX(5px)}}

@media(max-width:560px){
  .works__more{flex-direction:column;align-items:flex-start;justify-content:flex-start;text-align:left;gap:18px}
  .works__more-cta{align-self:flex-start}
}

/* ============================================================
   Works LP (works.html — 画像つき実績紹介ページ)
   ============================================================ */
.page-hero{
  position:relative;padding:clamp(140px,18vw,196px) 0 clamp(64px,8vw,96px);
  background:radial-gradient(120% 90% at 78% 8%,rgba(38,57,122,.5) 0%,rgba(28,44,94,.65) 42%,rgba(22,35,80,.92) 100%),var(--navy);
  overflow:hidden;
}
.page-hero__title{
  font-family:var(--font-display);font-weight:800;letter-spacing:-.01em;
  font-size:clamp(30px,5.2vw,52px);line-height:1.34;margin:22px 0 18px;
}
.page-hero__title em{font-style:normal;color:var(--seafoam)}
.page-hero__lead{max-width:640px;font-size:clamp(14.5px,1.6vw,17px);color:#c3cee4}

.cases{background:linear-gradient(180deg,var(--navy),var(--navy-2) 55%,var(--navy))}
.case-list{display:flex;flex-direction:column;gap:clamp(64px,9vw,120px)}
.case{display:grid;grid-template-columns:1.15fr .85fr;gap:clamp(32px,5vw,64px);align-items:center}
.case--reverse{grid-template-columns:.85fr 1.15fr}
.case--reverse .case__frame{order:2}
.case--reverse .case__body{order:1}
@media(max-width:900px){
  .case,.case--reverse{grid-template-columns:1fr}
  .case--reverse .case__frame,.case--reverse .case__body{order:initial}
}

.case__frame{
  border-radius:16px;overflow:hidden;background:#0c1428;
  border:1px solid rgba(238,243,248,.12);
  box-shadow:0 30px 70px rgba(6,10,20,.5);
  transition:transform .5s var(--ease),box-shadow .5s;
}
.case__frame:hover{transform:translateY(-6px);box-shadow:0 36px 80px rgba(6,10,20,.6)}
.case__framebar{display:flex;align-items:center;gap:6px;padding:11px 14px;background:#0f1830}
.case__framebar span{width:9px;height:9px;border-radius:50%;background:rgba(238,243,248,.16)}
.case__frame img{display:block;width:100%;height:auto}

.case__body{display:flex;flex-direction:column;gap:14px}
.case__tag{
  font-family:var(--font-mono);font-size:11.5px;letter-spacing:.22em;
  color:var(--seafoam);text-transform:uppercase;
}
.case__title{font-family:var(--font-display);font-weight:800;font-size:clamp(20px,2.4vw,27px)}
.case__desc{font-size:14.5px;color:#b7c3dc;line-height:1.9}
.case__meta{display:flex;flex-wrap:wrap;gap:8px}
.case__meta span{
  font-family:var(--font-mono);font-size:11px;color:var(--gray);
  border:1px solid rgba(147,161,191,.3);border-radius:99px;padding:5px 12px;
}
.case__link{
  margin-top:4px;display:inline-flex;align-items:center;gap:8px;align-self:flex-start;
  font-weight:700;font-size:14.5px;color:var(--seafoam);
  border-bottom:1px solid rgba(143,220,198,.4);padding-bottom:3px;
  transition:color .3s,border-color .3s;
}
.case__link:hover{color:var(--seafoam-2);border-color:var(--seafoam-2)}

.works-cta{padding:clamp(60px,8vw,96px) 0 clamp(90px,11vw,130px);text-align:center}
.works-cta__inner{display:flex;flex-direction:column;align-items:center;gap:22px;max-width:560px;margin-inline:auto}
.works-cta__title{font-family:var(--font-display);font-weight:800;font-size:clamp(22px,3vw,32px)}
.works-cta__note{font-size:14.5px;color:var(--gray)}

/* ============================================================
   Contact
   ============================================================ */
.contact{background:radial-gradient(120% 100% at 85% 0%,var(--navy-3),var(--navy) 65%)}
.contact__grid{display:grid;grid-template-columns:minmax(0,7fr) minmax(0,5fr);gap:clamp(32px,5vw,64px);align-items:start}
@media(max-width:860px){.contact__grid{grid-template-columns:1fr}}
.contact__mail{padding:24px 26px;border-radius:18px;background:rgba(255,255,255,.05);border:1px solid rgba(61,220,154,.18)}
.contact__mail-label{font-family:var(--font-mono);font-size:12px;letter-spacing:.14em;color:var(--seafoam)}
.contact__mail-addr{font-family:var(--font-mono);font-weight:500;font-size:clamp(15px,1.6vw,18px);margin-top:8px;word-break:break-all}
.contact__mail a:hover{color:var(--seafoam);text-decoration:underline}
.contact__note{margin-top:20px;font-size:12.5px;color:#8a97ad;line-height:2}

.form{display:grid;gap:16px}
.form__row{display:grid;grid-template-columns:1fr 1fr;gap:16px}
@media(max-width:560px){.form__row{grid-template-columns:1fr}}
.form__field{display:grid;gap:8px;font-size:13.5px;font-weight:700}
.form__field span em{
  font-style:normal;font-size:10px;background:var(--seafoam);color:var(--navy);
  padding:2px 8px;border-radius:99px;margin-left:8px;vertical-align:2px;
}
.form__field input,.form__field select,.form__field textarea{
  font:inherit;font-weight:500;color:var(--ink);
  background:rgba(255,255,255,.06);border:1px solid rgba(61,220,154,.2);
  border-radius:12px;padding:13px 15px;outline:none;
  transition:border-color .3s,box-shadow .3s,background .3s;
}
.form__field select option{color:var(--paper-ink)}
.form__field input::placeholder,.form__field textarea::placeholder{color:#5f6f8c}
.form__field input:focus,.form__field select:focus,.form__field textarea:focus{
  border-color:var(--seafoam);box-shadow:0 0 0 3px rgba(61,220,154,.16);background:rgba(255,255,255,.09);
}
.form__submit{border:0;cursor:pointer;justify-self:start;font-family:inherit}
.form__submit:disabled{opacity:.55;cursor:default;transform:none!important;box-shadow:none!important}
.form__error{
  font-size:13.5px;font-weight:700;color:#ff9d9d;
  background:rgba(255,80,80,.1);border:1px solid rgba(255,80,80,.32);
  border-radius:12px;padding:12px 16px;
}
.form__error[hidden]{display:none}
.form__honeypot{display:none}

/* ============================================================
   Footer
   ============================================================ */
.footer{background:#070d1c;padding:56px 0 0;border-top:1px solid rgba(61,220,154,.12)}
.footer__inner{display:flex;justify-content:space-between;gap:36px;flex-wrap:wrap;padding-bottom:44px}
.footer__brand{display:flex;gap:13px;align-items:flex-start}
.footer__nav{display:grid;gap:10px;font-size:13.5px}
.footer__nav a{color:#c3cee4;transition:color .3s}
.footer__nav a:hover{color:var(--seafoam)}
.footer__copy{
  text-align:center;font-family:var(--font-mono);font-size:11px;letter-spacing:.14em;color:#4c5975;
  padding:18px 0;border-top:1px solid rgba(255,255,255,.06);
}

@media(prefers-reduced-motion:reduce){
  *,*::before,*::after{animation-duration:.01ms!important;animation-iteration-count:1!important;transition-duration:.01ms!important}
  html{scroll-behavior:auto}
  .reveal{opacity:1;transform:none}
}