/* ============================================
   STIRA Inc. — Common Stylesheet
   Sporty & Dynamic
   ============================================ */
:root {
  --navy: #0a0e1a;
  --navy-2: #10182b;
  --navy-3: #182238;
  --accent: #ff4d2e;
  --accent-2: #ff8a00;
  --grad: linear-gradient(100deg, #ff4d2e 0%, #ff8a00 100%);
  --white: #ffffff;
  --gray: #9aa4b8;
  --light: #f4f6fa;
  --font-en: 'Oswald', 'Noto Sans JP', sans-serif;
  --font-jp: 'Noto Sans JP', sans-serif;
}

* { margin: 0; padding: 0; box-sizing: border-box; }
html { scroll-behavior: smooth; }
body {
  font-family: var(--font-jp);
  background: var(--navy);
  color: var(--white);
  line-height: 1.8;
  overflow-x: hidden;
}
img { max-width: 100%; }
a { color: inherit; text-decoration: none; }
ul { list-style: none; }

.container { max-width: 1140px; margin: 0 auto; padding: 0 24px; }

/* ---------- Header ---------- */
.header {
  position: fixed; top: 0; left: 0; right: 0; z-index: 100;
  background: rgba(10, 14, 26, .85);
  backdrop-filter: blur(12px);
  border-bottom: 1px solid rgba(255,255,255,.06);
  transition: background .3s;
}
.header-inner {
  max-width: 1200px; margin: 0 auto; padding: 0 24px;
  display: flex; align-items: center; justify-content: space-between;
  height: 72px;
}
.logo {
  font-family: var(--font-en);
  font-size: 1.7rem; font-weight: 700; font-style: italic;
  letter-spacing: .06em; line-height: 1;
}
.logo span { color: var(--accent); }
.logo small {
  display: block; font-size: .55rem; font-weight: 400;
  font-style: normal; letter-spacing: .28em; color: var(--gray);
}
.gnav ul { display: flex; gap: 36px; align-items: center; }
.gnav a {
  font-size: .92rem; font-weight: 500; letter-spacing: .05em;
  position: relative; padding: 6px 0;
}
.gnav a::after {
  content: ''; position: absolute; left: 0; bottom: 0;
  width: 0; height: 2px; background: var(--grad);
  transition: width .3s;
}
.gnav a:hover::after, .gnav a.active::after { width: 100%; }
.gnav .nav-cta {
  background: var(--grad); padding: 10px 26px; border-radius: 999px;
  font-weight: 700; transform: skewX(-6deg); display: inline-block;
  transition: transform .2s, box-shadow .2s;
}
.gnav .nav-cta:hover { transform: skewX(-6deg) translateY(-2px); box-shadow: 0 6px 20px rgba(255,77,46,.4); }
.gnav .nav-cta::after { display: none; }

/* Hamburger */
.menu-btn { display: none; background: none; border: 0; cursor: pointer; width: 40px; height: 40px; position: relative; z-index: 110; }
.menu-btn span {
  display: block; width: 26px; height: 2px; background: #fff;
  margin: 6px auto; transition: .3s;
}
.menu-btn.open span:nth-child(1) { transform: translateY(8px) rotate(45deg); }
.menu-btn.open span:nth-child(2) { opacity: 0; }
.menu-btn.open span:nth-child(3) { transform: translateY(-8px) rotate(-45deg); }

/* ---------- Page hero (sub pages) ---------- */
.page-hero {
  padding: 170px 0 90px;
  background:
    radial-gradient(ellipse 60% 50% at 80% 20%, rgba(255,77,46,.18), transparent),
    var(--navy-2);
  position: relative; overflow: hidden;
}
.page-hero::after {
  content: ''; position: absolute; right: -80px; top: -40px;
  width: 380px; height: 600px;
  background: var(--grad); opacity: .08;
  transform: skewX(-18deg);
}
.page-hero .en {
  font-family: var(--font-en); font-style: italic; font-weight: 700;
  font-size: clamp(2.6rem, 6vw, 4.2rem); letter-spacing: .04em; line-height: 1.1;
}
.page-hero .jp { color: var(--accent); font-weight: 700; letter-spacing: .2em; margin-top: 10px; }

/* ---------- Section common ---------- */
.section { padding: 96px 0; position: relative; }
.section.alt { background: var(--navy-2); }
.sec-head { margin-bottom: 56px; }
.sec-head .en {
  font-family: var(--font-en); font-style: italic; font-weight: 700;
  font-size: clamp(2rem, 4.5vw, 3rem); letter-spacing: .04em; line-height: 1.15;
}
.sec-head .en::after {
  content: ''; display: block; width: 64px; height: 4px;
  background: var(--grad); margin-top: 14px; transform: skewX(-20deg);
}
.sec-head .jp { color: var(--gray); font-weight: 500; letter-spacing: .15em; margin-top: 12px; font-size: .95rem; }
.sec-head.center { text-align: center; }
.sec-head.center .en::after { margin-left: auto; margin-right: auto; }

/* ---------- Buttons ---------- */
.btn {
  display: inline-block; background: var(--grad); color: #fff;
  font-weight: 700; letter-spacing: .08em;
  padding: 16px 52px; border-radius: 999px; border: 0; cursor: pointer;
  font-size: 1rem; transform: skewX(-6deg);
  transition: transform .2s, box-shadow .2s;
}
.btn > span { display: inline-block; transform: skewX(6deg); }
.btn:hover { transform: skewX(-6deg) translateY(-3px); box-shadow: 0 10px 28px rgba(255,77,46,.45); }
.btn.ghost { background: transparent; border: 2px solid var(--accent); color: #fff; }

/* ---------- Cards ---------- */
.card {
  background: var(--navy-3); border: 1px solid rgba(255,255,255,.07);
  border-radius: 14px; padding: 36px 30px;
  transition: transform .25s, border-color .25s, box-shadow .25s;
  position: relative; overflow: hidden;
}
.card::before {
  content: ''; position: absolute; top: 0; left: 0; right: 0; height: 4px;
  background: var(--grad); transform: scaleX(0); transform-origin: left;
  transition: transform .3s;
}
.card:hover { transform: translateY(-6px); border-color: rgba(255,77,46,.4); box-shadow: 0 16px 40px rgba(0,0,0,.4); }
.card:hover::before { transform: scaleX(1); }

/* ---------- Footer ---------- */
.footer { background: #060911; border-top: 1px solid rgba(255,255,255,.06); padding: 64px 0 28px; }
.footer-inner { max-width: 1140px; margin: 0 auto; padding: 0 24px; }
.footer-top { display: flex; justify-content: space-between; flex-wrap: wrap; gap: 40px; margin-bottom: 48px; }
.footer .logo { font-size: 2rem; }
.footer-addr { color: var(--gray); font-size: .88rem; margin-top: 16px; font-style: normal; }
.footer-nav { display: flex; gap: 32px; flex-wrap: wrap; }
.footer-nav a { color: var(--gray); font-size: .92rem; transition: color .2s; }
.footer-nav a:hover { color: var(--accent); }
.copyright { text-align: center; color: #5a6478; font-size: .8rem; letter-spacing: .08em; border-top: 1px solid rgba(255,255,255,.05); padding-top: 24px; }

/* ---------- Scroll reveal ---------- */
.reveal { opacity: 0; transform: translateY(32px); transition: opacity .7s ease, transform .7s ease; }
.reveal.visible { opacity: 1; transform: none; }
.reveal.d1 { transition-delay: .1s; } .reveal.d2 { transition-delay: .2s; }
.reveal.d3 { transition-delay: .3s; } .reveal.d4 { transition-delay: .4s; }

/* ---------- Responsive ---------- */
@media (max-width: 860px) {
  .menu-btn { display: block; }
  .gnav {
    position: fixed; inset: 0; background: rgba(6,9,17,.97);
    display: flex; align-items: center; justify-content: center;
    opacity: 0; pointer-events: none; transition: opacity .3s;
  }
  .gnav.open { opacity: 1; pointer-events: auto; }
  .gnav ul { flex-direction: column; gap: 32px; text-align: center; }
  .gnav a { font-size: 1.2rem; }
  .section { padding: 64px 0; }
  .page-hero { padding: 130px 0 60px; }
}