/* ===========================
   Base
=========================== */
body {
  font-family: "Helvetica Neue", sans-serif;
  color: #222;
  margin: 0;
  padding-top: 100px; /* PC nav + icon */
  background: #fff;
}

body:not(.ready) * {
  transition: none !important;
}

ul { list-style: none; padding: 0; margin: 0; }
a { color: inherit; text-decoration: none; }

/* ===========================
   Navigation
=========================== */
.nav-header {
  position: fixed;
  top: 0;
  left: 0;
  width: 100%;
  height: 60px;
  background: #fff;
  display: flex;
  align-items: center;
  padding: 16px 40px;
  transition: top 0.4s ease, opacity 0.4s ease;
  z-index: 999;
}

.nav-header ul {
  display: flex;
  gap: 24px;
}

.nav-header a:hover { opacity: 0.6; }

.nav-header a.nav-active {
  border-bottom: 1px solid #FE452D;
}

/* Scroll hidden */
.nav-hidden {
  top: -100px;
  opacity: 0;
}

/* ===========================
   Sub Navigation (Current / CV)
=========================== */
.subnav {
  display: flex;
  justify-content: center;
  gap: 32px;
  margin-top: 5px;
  border-bottom: 1px solid #ddd;
}

.subnav .tab {
  text-decoration: none;
  color: #9d9d9d;
  padding: 8px 12px;
  font-size: 16px;
}

.subnav .tab.active {
  color: #000;
  border-bottom: 2px solid #FE452D;
}

/* ===========================
   Icons
=========================== */
.icon-group {
  position: fixed;
  top: 36px;
  right: 60px;
  display: flex;
  gap: 16px;
  z-index: 1000;
  transition: opacity 0.3s;
}

.icon-btn {
  position: relative;
  color: #9d9d9d;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  transition: color 0.3s, opacity 0.3s;
}

.icon-btn.active { color: #000; }
.icon-btn:hover { opacity: 0.7; }

/* Tooltip */
.tooltip {
  position: absolute;
  bottom: -1.8em;
  left: 50%;
  transform: translateX(-50%);
  background: #333;
  color: #fff;
  padding: 2px 6px;
  border-radius: 3px;
  font-size: 12px;
  opacity: 0;
  pointer-events: none;
  transition: opacity 0.2s ease;
}
.icon-btn:hover .tooltip { opacity: 0.7; }

/* ===========================
   Footer
=========================== */
footer {
  margin-top: 80px;
  font-size: 12px;
  color: #555;
  text-align: center;
  padding: 20px;
}

/* ===========================
   Responsive Tablet
=========================== */
@media (max-width: 900px) {

  body { padding-top: 90px; }

  .nav-header { padding: 12px 24px 6px; }

  .icon-group {
    top: 30px;
    right: 24px;
  }

  .tooltip { display: none; }
}

/* ===========================
   Responsive Mobile
=========================== */
@media (max-width: 600px) {

  body { padding-top: 80px; }

  .nav-header {
    padding: 8px 20px 4px;
    justify-content: flex-start;
    gap: 20px;
  }

  .nav-header ul {
    flex-wrap: wrap;
    column-gap: 20px;
    row-gap: 6px;
  }

  .nav-header ul li:last-child {
    padding-right: 40px; /* アイコン位置調整のため */
  }

  .icon-group {
    top: 80px;
    right: 20px;
    gap: 16px;
  }

  .tooltip { display: none; }
}