/* ============================================
 * Magic Darkroom · Button
 *
 * 3D press feel: default 5px shadow → hover 6px + lift → active 1px + sink.
 * Always pill-shaped (border-radius: 50px).
 *
 * Classes:
 *   .md-btn                 base (required)
 *   .md-btn--primary        mochi orange background
 *   .md-btn--secondary      outlined, transparent
 *   .md-btn--yellow         focus-yellow (#ffcc00) — used in modals
 *   .md-btn--danger         error red
 *   .md-btn--loading        animated mint stripes
 *   .md-btn--sm             32px height
 *   .md-btn--lg             48px height
 *   .md-btn--block          full-width
 *   .md-btn--disabled / [disabled]
 * ============================================ */

.md-btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 6px;
  height: 45px;
  padding: 0 22px;
  font-family: var(--font-sans);
  font-size: 14px;
  font-weight: 700;
  letter-spacing: 0.02em;
  line-height: 1;
  border: 0;
  border-radius: 50px;
  cursor: pointer;
  user-select: none;
  white-space: nowrap;
  transition:
    background var(--dur-normal) var(--ease-standard),
    box-shadow var(--dur-normal) var(--ease-standard),
    transform  var(--dur-normal) var(--ease-standard),
    opacity    var(--dur-normal) var(--ease-standard);
}

/* ---- Primary (Mochi orange) ---- */
.md-btn--primary {
  background: var(--c-mochi);
  color: #fff;
  box-shadow: 0 5px 0 0 var(--sh-btn);
}
.md-btn--primary:hover {
  background: var(--c-mochi-deep);
  box-shadow: 0 6px 0 0 var(--sh-btn);
  transform: translateY(-1px);
}
.md-btn--primary:active {
  box-shadow: 0 1px 0 0 var(--sh-btn);
  transform: translateY(2px);
}

/* ---- Secondary (outlined) ---- */
.md-btn--secondary {
  background: transparent;
  color: var(--c-text);
  box-shadow:
    inset 0 0 0 2px var(--c-line-soft),
    0 5px 0 0 var(--sh-btn);
}
.md-btn--secondary:hover {
  box-shadow:
    inset 0 0 0 2px var(--c-line),
    0 6px 0 0 var(--sh-btn);
  transform: translateY(-1px);
}
.md-btn--secondary:active {
  box-shadow:
    inset 0 0 0 2px var(--c-line),
    0 1px 0 0 var(--sh-btn);
  transform: translateY(2px);
}

/* ---- Yellow (modal primary action) ---- */
.md-btn--yellow {
  background: var(--c-focus-yellow);
  color: var(--c-text);
  box-shadow: 0 5px 0 0 var(--sh-btn);
}
.md-btn--yellow:hover {
  background: var(--c-focus-deep);
  box-shadow: 0 6px 0 0 var(--sh-btn);
  transform: translateY(-1px);
}
.md-btn--yellow:active {
  box-shadow: 0 1px 0 0 var(--sh-btn);
  transform: translateY(2px);
}

/* ---- Danger (error red) ---- */
.md-btn--danger {
  background: var(--c-error);
  color: #fff;
  box-shadow: 0 5px 0 0 #b34545;
}
.md-btn--danger:hover {
  background: #cc4e4e;
  box-shadow: 0 6px 0 0 #b34545;
  transform: translateY(-1px);
}
.md-btn--danger:active {
  box-shadow: 0 1px 0 0 #b34545;
  transform: translateY(2px);
}

/* ---- Loading (mint stripes) ---- */
.md-btn--loading {
  background-image: repeating-linear-gradient(
    -45deg,
    #0ec4b6 0,
    #0ec4b6 10px,
    #01b0a7 10px,
    #01b0a7 20px
  );
  background-size: 28.28px 28.28px;
  background-color: #0ec4b6;
  animation: md-btn-stripes 1s linear infinite;
  color: #fff;
  box-shadow: 0 5px 0 0 #08907f;
  pointer-events: none;
}

/* ---- Sizes ---- */
.md-btn--sm {
  height: 32px;
  padding: 0 16px;
  font-size: 12px;
  border-radius: 12px;
}

.md-btn--lg {
  height: 48px;
  padding: 0 32px;
  font-size: 16px;
  border-radius: 24px;
}

/* ---- Block ---- */
.md-btn--block {
  width: 100%;
}

/* ---- Disabled ---- */
.md-btn--disabled,
.md-btn[disabled] {
  opacity: 0.45;
  pointer-events: none;
  box-shadow: 0 3px 0 0 var(--sh-btn);
  transform: none;
}