/* =============================================
   TRIVE inc. — Common Styles
   共通スタイル (nav / hamburger / footer / cursor)
   ============================================= */

/* ─── Base ─── */
* { box-sizing: border-box; margin: 0; padding: 0; }
html { scroll-behavior: smooth; }
body { font-family: 'DM Sans', sans-serif; color: #1a1a18; background: #f8f7f4; }

/* ─── Overlay nav ─── */
.nav-overlay {
  position: fixed; top: 0; right: 0; z-index: 100;
  display: flex; flex-direction: column; align-items: flex-end;
  padding: 32px 36px; gap: 18px;
}
@keyframes float {
  0%   { transform: translateY(0px); }
  50%  { transform: translateY(-16px); }
  100% { transform: translateY(0px); }
}
.nav-logo img {
  width: 72px; height: 72px; object-fit: contain; display: block;
  animation: float 5s ease-in-out infinite;
}
.nav-links { list-style: none; display: flex; flex-direction: column; align-items: flex-end; }
.nav-links a {
  font-size: 15px; letter-spacing: 0.18em; color: #fff;
  text-decoration: none; text-transform: uppercase;
  display: block; padding: 14px 0; transition: opacity 0.2s;
  text-shadow: 0 1px 6px rgba(0,0,0,0.3);
}
.nav-links a:hover, .nav-links a.active { opacity: 0.55; }
.nav-overlay.dark .nav-links a { color: #1a1a18; text-shadow: none; }

/* ─── Hamburger (SP only) ─── */
.nav-hamburger {
  display: none;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  gap: 7px;
  width: 48px; height: 62px;
  cursor: pointer;
  background: none;
  border: none;
  padding: 0;
  z-index: 200;
}
.nav-hamburger span {
  display: block;
  width: 34px; height: 2px;
  background: #fff;
  transition: transform 0.3s ease, opacity 0.3s ease,
              width 0.3s ease, background 0.25s ease;
  transform-origin: center;
}
.nav-hamburger:hover span { background: rgba(123, 124, 160, 0.9); }
.nav-hamburger:hover span:nth-child(2) { width: 18px; }
.nav-overlay.dark .nav-hamburger span { background: #1a1a18; }
.nav-overlay.dark .nav-hamburger:hover span { background: rgba(26, 26, 24, 0.5); }
.nav-hamburger.open span { background: #f8f7f4 !important; }
.nav-hamburger.open span:nth-child(1) { transform: translateY(9px) rotate(45deg); }
.nav-hamburger.open span:nth-child(2) { opacity: 0; }
.nav-hamburger.open span:nth-child(3) { transform: translateY(-9px) rotate(-45deg); }

/* ─── SP fullscreen menu ─── */
.sp-menu {
  position: fixed;
  inset: 0;
  background: rgba(48, 51, 91, 0.8);
  z-index: 150;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  opacity: 0;
  pointer-events: none;
  transition: opacity 0.4s ease;
}
.sp-menu.open { opacity: 1; pointer-events: auto; }
.sp-menu a {
  font-family: 'DM Sans', sans-serif;
  font-size: 28px;
  letter-spacing: 0.18em;
  color: #f8f7f4;
  text-decoration: none;
  text-transform: uppercase;
  padding: 18px 0;
  opacity: 0;
  transform: translateY(20px);
  transition: opacity 0.45s ease, transform 0.45s ease;
}
.sp-menu a.visible { opacity: 1; transform: translateY(0); }
.sp-menu a.active.visible { opacity: 0.5; }
.sp-menu a:hover { opacity: 0.4 !important; }

/* ─── Fade-up ─── */
.fade-up { opacity: 0; transform: translateY(28px); transition: opacity 0.7s ease, transform 0.7s ease; }
.fade-up.visible { opacity: 1; transform: translateY(0); }

/* ─── Footer ─── */
footer {
  padding: 28px 52px; border-top: 0.5px solid rgba(0,0,0,0.08);
  display: flex; align-items: center; justify-content: space-between;
}
.footer-logo { font-size: 13px; letter-spacing: 0.15em; color: #aaa; text-transform: uppercase; }
.footer-copy  { font-size: 9px;  letter-spacing: 0.15em; color: #ccc; text-transform: uppercase; }

/* ─── Custom cursor ─── */
.cur-dot {
  position: fixed;
  width: 24px; height: 24px;
  background: rgba(48, 51, 91, 0.55);
  border-radius: 50%;
  pointer-events: none;
  transform: translate(-50%, -50%);
  z-index: 9999;
  mix-blend-mode: multiply;
  opacity: 0;
  transition: opacity 0.3s ease;
}
.cur-dot.visible { opacity: 1; }

.cur-ring {
  position: fixed;
  border-radius: 50%;
  pointer-events: none;
  transform: translate(-50%, -50%);
  z-index: 9998;
  opacity: 0;
  transition: opacity 0.3s ease, width 0.4s ease, height 0.4s ease;
}
.cur-ring.visible { opacity: 1; }

/* ─── Char-by-char text animation ─── */
.char {
  display: inline-block;
  opacity: 0;
  transform: translateY(10px);
  transition: opacity 0.7s ease, transform 0.7s ease;
  transition-delay: calc(var(--char-i) * 0.07s);
}
.char-wrap.visible .char {
  opacity: 1;
  transform: translateY(0);
}
.char.space { width: 0.3em; }

/* ─── SP media query (共通) ─── */
@media (max-width: 768px) {
  .nav-overlay { padding: 20px; gap: 12px; }
  .nav-logo img { width: 48px; height: 48px; }
  .nav-links a  { font-size: 11px; padding: 8px 0; }
  .nav-links    { display: none; }
  .nav-hamburger { display: flex; }
  footer { padding: 24px 20px; }
}