/* ── Reset ── */
*,
*::before,
*::after {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}

:root {
  --text: #f0ede8;
  --muted: #9a9088;
  --font-display: "DM Serif Display", Georgia, serif;
  --font-body: "DM Sans", system-ui, sans-serif;
}

html {
  height: 100%;
}

body {
  display: flex;
  flex-direction: column;
  min-height: 100dvh;
  font-family: var(--font-body);
  background: radial-gradient(ellipse at 50% 50%, #362e25 0%, #080604 100%);
  color: var(--text);
  -webkit-font-smoothing: antialiased;
}

a {
  color: inherit;
  text-decoration: none;
}

/* ── Fade-in ── */
@keyframes fadeUp {
  from {
    opacity: 0;
    transform: translateY(10px);
  }
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

/* ── Layout ── */
.layout {
  display: grid;
  grid-template-columns: 1fr auto 1fr;
  align-items: center;
  align-content: center;
  flex: 1;
  padding: 3rem 4rem 6rem;
  gap: 4rem;
}

/* ── Footer ── */
.footer-tag {
  position: fixed;
  bottom: 0;
  left: 0;
  right: 0;
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 0.6rem;
  font-size: 0.68rem;
  font-weight: 300;
  color: var(--muted);
  letter-spacing: 0.1em;
  padding: 1rem 1.5rem 1.75rem;
  text-align: center;
}

.footer-tag a {
  transition: color 0.1s ease;
}

.footer-tag a:hover {
  color: var(--text);
}

/* ── Left ── */
.side-left {
  display: flex;
  flex-direction: column;
  align-items: flex-end;
  text-align: right;
  gap: 1rem;
  opacity: 0;
  animation: fadeUp 0.7s ease forwards;
  animation-delay: 0.1s;
}

.name {
  font-family: var(--font-display);
  font-size: 2rem;
  letter-spacing: 0.01em;
  line-height: 1;
}

.name-sub {
  font-size: 0.72rem;
  font-weight: 300;
  color: var(--muted);
  letter-spacing: 0.2em;
  margin-top: -0.5rem;
}

.social {
  display: flex;
  flex-direction: column;
  align-items: flex-end;
  gap: 0.35rem;
}

.social a {
  font-size: 0.72rem;
  font-weight: 300;
  color: var(--muted);
  letter-spacing: 0.1em;
  transition: color 0.1s ease;
}

.social a:hover {
  color: var(--text);
}

/* ── Center column ── */
.center-col {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 1.1rem;
  opacity: 0;
  animation: fadeUp 0.7s ease forwards;
  animation-delay: 0.25s;
}

/* ── Photo ── */
.photo {
  width: min(340px, 36vw);
  aspect-ratio: 1;
  border-radius: 50%;
  object-fit: cover;
  object-position: top center;
  display: block;
}

/* ── Right nav ── */
.side-right {
  opacity: 0;
  animation: fadeUp 0.7s ease forwards;
  animation-delay: 0.4s;
}

/* ── Panels ── */
.nav-panel {
  display: none;
  flex-direction: column;
  align-items: flex-start;
  gap: 0.55rem;
  transition: opacity 0.1s ease;
}

.nav-panel.active {
  display: flex;
  opacity: 1;
}
.nav-panel.fading {
  opacity: 0;
}

/* ── Nav items ── */
.nav-top {
  font-family: var(--font-body);
  font-weight: 300;
  font-size: 1.2rem;
  letter-spacing: 0.1em;
  color: var(--text);
  background: none;
  border: none;
  cursor: pointer;
  padding: 0;
  display: inline-block;
  transition:
    color 0.18s ease,
    transform 0.18s ease;
}

.nav-top:hover {
  color: var(--muted);
  transform: translateX(4px);
}

/* ── Sub-menu items ── */
.nav-sub-top {
  font-family: var(--font-body);
  font-weight: 300;
  font-size: 1.1rem;
  letter-spacing: 0.1em;
  color: var(--text);
  display: inline-block;
  transition:
    color 0.1s ease,
    transform 0.1s ease;
}

.nav-sub-top:hover {
  color: var(--muted);
  transform: translateX(4px);
}

/* ── Back button ── */
.nav-back {
  background: none;
  border: none;
  cursor: pointer;
  padding: 0;
  font-size: 1.2rem;
  color: var(--muted);
  margin-bottom: 0.3rem;
  transition: color 0.1s ease;
  line-height: 1;
}

.nav-back:hover {
  color: var(--text);
}

/* ── Mobile ── */
.social-mobile {
  display: none;
}

@media (max-width: 768px) {
  .layout {
    grid-template-columns: 1fr;
    justify-items: center;
    align-content: start;
    padding: 1.75rem;
    gap: 1.75rem;
  }

  /* Revol.C 左上角 logo */
  .side-left {
    align-items: flex-start;
    text-align: left;
    justify-self: start;
    width: 100%;
    gap: 0;
  }

  .name {
    font-size: 1.5rem;
  }
  .name-sub {
    display: none;
  }
  .side-left .social {
    display: none;
  }

  /* 圖片放大 */
  .center-col {
    width: 100%;
  }
  .photo {
    width: min(300px, 80vw);
  }

  /* GitHub / YouTube 在圖片下方 */
  .social-mobile {
    display: flex;
    gap: 1.5rem;
  }

  .social-mobile a {
    font-size: 0.72rem;
    font-weight: 300;
    color: var(--muted);
    letter-spacing: 0.1em;
    transition: color 0.1s ease;
  }

  /* menu 字小一點 */
  .nav-top {
    font-size: 1.1rem;
  }
  .nav-sub-top {
    font-size: 0.9rem;
  }
  .nav-panel {
    align-items: center;
  }

  .nav-top:hover,
  .nav-sub-top:hover {
    transform: none;
  }

  .footer-tag {
    position: static;
    padding: 0 1.5rem 2rem;
  }
}