/* ============================================
   COMPONENTS — Buttons, Mode Toggle, Chips
   All font-size, spacing, radius → tokens only
   ============================================ */

/* ── BUTTONS ── */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: var(--space-2);
  font-family: var(--font-mono);
  font-weight: 400;
  font-size: var(--size-mono-sm);
  letter-spacing: 0.10em;
  text-transform: uppercase;
  border-radius: var(--radius-button);
  border: none;
  cursor: pointer;
  text-decoration: none;
  white-space: nowrap;
  transition: filter 0.2s ease, background 0.2s ease, border-color 0.2s ease, color 0.2s ease;
  position: relative;
  overflow: hidden;
}

/* sizes */
.btn-sm { height: 36px; padding: 0 var(--space-5);  }
.btn-md { height: 44px; padding: 0 var(--space-6);  }
.btn-lg { height: 52px; padding: 0 var(--space-8);  }

/* primary — brand gradient */
.btn-primary {
  background: var(--grad-brand-h);
  color: var(--prim-neutral-0);
}
.btn-primary:hover { filter: brightness(1.12); }

/* outline */
.btn-outline {
  background: transparent;
  color: var(--color-text-default);
  border: var(--border-default) solid rgba(91, 127, 232, 0.30);
}
.btn-outline:hover { border-color: var(--color-brand-blue); }

/* secondary */
.btn-secondary {
  background: var(--color-bg-surface);
  color: var(--color-text-default);
  border: var(--border-default) solid rgba(74, 104, 212, 0.30);
}
.btn-secondary:hover {
  border-color: var(--color-brand-blue);
  background: var(--color-bg-card);
}

/* ghost */
.btn-ghost {
  background: transparent;
  color: var(--color-text-muted);
  border: var(--border-subtle) solid var(--color-border-subtle);
}
.btn-ghost:hover {
  color: var(--color-text-default);
  border-color: var(--color-border-strong);
}

/* ── CHIPS / TAGS ── */
/* Hero chips — mono-sm */
.chip {
  display: inline-flex;
  align-items: center;
  padding: var(--space-1) var(--space-3);
  border-radius: var(--radius-button);
  border: var(--border-default) solid var(--color-border-default);
  font-family: var(--font-mono);
  font-size: var(--size-mono-sm);
  font-weight: 300;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: var(--color-text-muted);
  white-space: nowrap;
  cursor: default;
  transition: border-color 0.2s ease, color 0.2s ease;
}
.chip:hover {
  border-color: var(--color-brand-blue);
  color: var(--color-brand-blue);
}
.chip-highlight {
  background: rgba(74, 104, 212, 0.07);
  border-color: rgba(74, 104, 212, 0.25);
  color: var(--color-brand-blue);
}
.chip-highlight:hover {
  background: rgba(74, 104, 212, 0.12);
  border-color: rgba(74, 104, 212, 0.50);
}

/* Work/card chips — mono-xs */
.chip-work {
  font-size: var(--size-mono-xs);
  font-weight: 300;
  padding: 2px var(--space-3);
  border-color: var(--color-border-subtle);
  letter-spacing: 0.08em;
}
.chip-work:hover {
  border-color: var(--color-brand-blue);
  color: var(--color-brand-blue);
}

/* ── MODE TOGGLE ── */
.mode-toggle {
  background: none;
  border: none;
  padding: 0;
  cursor: pointer;
  display: flex;
  align-items: center;
  flex-shrink: 0;
}
.mode-toggle-track {
  width: 52px;
  height: 28px;
  border-radius: var(--radius-full);
  background: var(--color-bg-surface);
  border: var(--border-default) solid var(--color-border-subtle);
  position: relative;
  transition: background 0.3s ease, border-color 0.3s ease;
}
.mode-toggle-thumb {
  position: absolute;
  top: 50%;
  transform: translateY(-50%);
  width: 22px;
  height: 22px;
  border-radius: var(--radius-full);
  background: var(--color-bg-overlay);
  display: flex;
  align-items: center;
  justify-content: center;
  color: var(--color-text-muted);
  transition: left 0.35s cubic-bezier(0.4, 0, 0.2, 1), background 0.3s ease;
}
[data-theme="dark"]  .mode-toggle-thumb { left: 27px; }
[data-theme="light"] .mode-toggle-thumb { left: 3px;  }
.mode-toggle:hover .mode-toggle-track { border-color: var(--color-border-strong); }

/* ── SCROLL REVEAL ── */
.rev {
  opacity: 0;
  transform: translateY(22px);
  transition: opacity 0.7s ease, transform 0.7s ease;
}
.rev.in {
  opacity: 1;
  transform: translateY(0);
}
.rev-d1 { transition-delay: 0.1s; }
.rev-d2 { transition-delay: 0.2s; }
.rev-d3 { transition-delay: 0.3s; }
.rev-d4 { transition-delay: 0.4s; }