/* ===== VARIABLES ===== */
:root {
  --c-bg:      #f5f5f3;
  --c-surface: #ffffff;
  --c-border:  #e8e8e4;
  --c-text:    #1a1a1a;
  --c-muted:   #6b6b6b;

  --font-sans: ui-sans-serif, system-ui, -apple-system, BlinkMacSystemFont,
               "Segoe UI", "Noto Sans JP", sans-serif;
  --font-mono: ui-monospace, "Cascadia Code", "Fira Code", monospace;

  --transition: 250ms ease;
}

/* ===== RESET ===== */
*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }
html { font-size: 16px; scroll-behavior: smooth; }
ul { list-style: none; }
a { color: inherit; text-decoration: none; }

body {
  font-family: var(--font-sans);
  background-color: var(--c-bg);
  color: var(--c-text);
  line-height: 1.7;
  min-height: 100vh;
}

/* ===== LAYOUT ===== */
.container {
  max-width: 900px;
  margin-inline: auto;
  padding-inline: 2rem;
}

/* ===== HERO ===== */
.site-header {
  padding-block: 6rem 4rem;
  border-bottom: 1px solid var(--c-border);
}

.hero-inner {
  display: flex;
  align-items: center;
  gap: 2.5rem;
}

.hero-avatar {
  width: 120px;
  height: 120px;
  border-radius: 50%;
  object-fit: cover;
  flex-shrink: 0;
  border: 3px solid var(--c-border);
  box-shadow: 0 4px 20px rgba(0, 0, 0, 0.08);
}

.hero-text {
  display: flex;
  flex-direction: column;
  gap: 0.25rem;
}

.eyebrow {
  font-family: var(--font-mono);
  font-size: 0.85rem;
  color: var(--c-muted);
  letter-spacing: 0.05em;
}

.hero-name {
  font-size: clamp(2rem, 6vw, 3.25rem);
  font-weight: 700;
  letter-spacing: -0.03em;
  line-height: 1.05;
  color: var(--c-text);
  margin-top: 0.1rem;
}

.hero-bio {
  font-size: 1rem;
  color: var(--c-muted);
  max-width: 48ch;
  line-height: 1.8;
  margin-top: 0.75rem;
}

/* ===== SECTIONS ===== */
.section {
  padding-block: 4rem;
}

.link-group-label {
  font-family: var(--font-mono);
  font-size: 0.7rem;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: var(--c-muted);
  margin-bottom: 1rem;
}

.tile-grid + .link-group-label {
  margin-top: 2.5rem;
}

/* ===== TILES ===== */
.tile-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(160px, 1fr));
  gap: 1rem;
}

.tile {
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  gap: 0.5rem;
  padding: 2rem 1rem 1.5rem;
  background: var(--c-surface);
  border: 1px solid var(--c-border);
  border-radius: 16px;
  text-align: center;
  cursor: pointer;
  transition:
    transform var(--transition),
    box-shadow var(--transition),
    border-color var(--transition);
}

.tile:hover {
  transform: translateY(-6px);
  box-shadow: 0 16px 40px rgba(0, 0, 0, 0.10);
  border-color: #d0d0cc;
}

.tile:active {
  transform: translateY(-2px);
  box-shadow: 0 6px 16px rgba(0, 0, 0, 0.07);
}

.tile-icon {
  width: 32px;
  height: 32px;
  color: var(--c-text);
}

.tile-name {
  font-size: 0.875rem;
  font-weight: 600;
  color: var(--c-text);
  line-height: 1.3;
}

.tile-handle {
  font-family: var(--font-mono);
  font-size: 0.75rem;
  color: var(--c-muted);
}

/* ===== FOOTER ===== */
.site-footer {
  padding-block: 2rem;
  border-top: 1px solid var(--c-border);
}

.site-footer p {
  font-family: var(--font-mono);
  font-size: 0.8rem;
  color: var(--c-muted);
}

/* ===== SCROLL ANIMATIONS ===== */
.animate {
  opacity: 0;
  transform: translateY(20px);
  transition: opacity 0.55s ease, transform 0.55s ease;
}

.animate.visible {
  opacity: 1;
  transform: translateY(0);
}

.tile-grid .animate:nth-child(1) { transition-delay: 0ms; }
.tile-grid .animate:nth-child(2) { transition-delay: 60ms; }
.tile-grid .animate:nth-child(3) { transition-delay: 120ms; }
.tile-grid .animate:nth-child(4) { transition-delay: 180ms; }
.tile-grid .animate:nth-child(5) { transition-delay: 240ms; }

/* ===== RESPONSIVE ===== */
@media (max-width: 600px) {
  .site-header { padding-block: 3.5rem 2.5rem; }
  .hero-inner { flex-direction: column; align-items: flex-start; gap: 1.5rem; }
  .hero-avatar { width: 96px; height: 96px; }
  .section { padding-block: 2.5rem; }
  .tile-grid { grid-template-columns: repeat(3, 1fr); }
}

@media (max-width: 400px) {
  .tile-grid { grid-template-columns: repeat(2, 1fr); }
}