/* ==========================================================================
   DENTALINS — BUTTON SYSTEM (buttons.css)
   Premium, modern buton tasarımı.
   Pill shape, refined hover micro-interactions, minimal accent kullanımı.
   BEM: .btn, .btn--{variant}, .btn--{size}
   ========================================================================== */

/* ======================================================================
   1. BASE BUTTON
   Tüm butonların ortak stilleri.
   ====================================================================== */

.btn {
  /* Layout */
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: var(--space-2);

  /* Sizing (varsayılan: md) */
  padding: 0.75rem 1.75rem;
  min-height: 46px;

  /* Typography */
  font-family: var(--font-primary);
  font-size: var(--text-sm);
  font-weight: var(--weight-semibold);
  line-height: var(--leading-normal);
  letter-spacing: 0.04em;
  text-decoration: none;
  text-align: center;
  white-space: nowrap;

  /* Appearance — Pill shape */
  border: var(--btn-border-width) solid transparent;
  border-radius: var(--btn-radius);
  cursor: pointer;

  /* Transition — smooth micro-interaction */
  transition: var(--btn-transition);

  /* Prevent text selection */
  user-select: none;
  -webkit-user-select: none;

  /* Stacking context for pseudo-elements */
  position: relative;
  overflow: hidden;
  z-index: 0;
}

/* Subtle shimmer overlay on hover */
.btn::before {
  content: '';
  position: absolute;
  top: 0;
  left: -100%;
  width: 100%;
  height: 100%;
  background: linear-gradient(
    90deg,
    transparent 0%,
    var(--btn-shimmer) 50%,
    transparent 100%
  );
  transition: left var(--transition-smooth);
  z-index: 1;
  pointer-events: none;
}

.btn:hover::before {
  left: 100%;
}

/* Focus ring — keyboard navigation */
.btn:focus-visible {
  outline: 2px solid var(--color-primary-400);
  outline-offset: 3px;
}


/* ======================================================================
   2. BUTTON VARIANTS
   ====================================================================== */

/* --- PRIMARY ---
   Ana CTA butonu. Cyan gradient, beyaz metin.
   Kullanım: "Randevu Al", "Gönder", birincil aksiyonlar. */
.btn--primary {
  background: linear-gradient(135deg, var(--color-primary-500) 0%, var(--color-primary-600) 100%);
  color: var(--color-text-inverse);
  border-color: transparent;
  box-shadow: 0 4px 14px rgba(var(--btn-primary-rgb), 0.30);
}

.btn--primary:hover {
  background: linear-gradient(135deg, var(--color-primary-400) 0%, var(--color-primary-500) 100%);
  transform: translateY(-2px) scale(1.03);
  box-shadow:
    0 8px 25px rgba(var(--btn-primary-rgb), 0.40),
    0 0 0 4px rgba(var(--btn-primary-rgb), 0.12);
}

.btn--primary:active {
  background: linear-gradient(135deg, var(--color-primary-600) 0%, var(--color-primary-700) 100%);
  transform: translateY(0) scale(1);
  box-shadow: 0 2px 8px rgba(var(--btn-primary-rgb), 0.25);
}


/* --- SECONDARY ---
   İkincil aksiyon. Lacivert, beyaz metin.
   Kullanım: "Detaylı Bilgi", "Daha Fazla". */
.btn--secondary {
  background-color: var(--color-secondary-500);
  color: var(--color-text-inverse);
  border-color: transparent;
  box-shadow: var(--shadow-secondary-sm);
}

.btn--secondary:hover {
  background-color: var(--color-secondary-400);
  transform: translateY(var(--btn-hover-lift));
  box-shadow: var(--shadow-secondary-lg);
}

.btn--secondary:active {
  background-color: var(--color-secondary-700);
  transform: translateY(0);
  box-shadow: var(--shadow-secondary-xs);
}


/* --- OUTLINE ---
   Ghost CTA. Şeffaf bg, primary çerçeve + metin.
   Kullanım: "Tedavilerimizi Gör", ikincil CTA'lar. */
.btn--outline {
  background-color: transparent;
  color: var(--color-primary-600);
  border-color: var(--color-primary-400);
}

.btn--outline::before {
  background: linear-gradient(
    90deg,
    transparent 0%,
    var(--btn-outline-hover-bg) 50%,
    transparent 100%
  );
}

.btn--outline:hover {
  background-color: var(--btn-outline-hover-bg);
  color: var(--color-primary-700);
  border-color: var(--color-primary-500);
  transform: translateY(var(--btn-hover-lift));
  box-shadow: var(--shadow-outline-lg);
}

.btn--outline:active {
  background-color: var(--btn-outline-active-bg);
  color: var(--color-primary-800);
  border-color: var(--color-primary-600);
  transform: translateY(0);
}


/* --- OUTLINE LIGHT ---
   Koyu arka plan üzerinde kullanılır.
   Kullanım: Hero'da ikinci CTA, dark section'larda. */
.btn--outline-light,
.btn--outline-white {
  background-color: transparent;
  color: var(--color-text-inverse);
  border-color: var(--btn-light-border);
}

.btn--outline-light::before,
.btn--outline-white::before {
  background: linear-gradient(
    90deg,
    transparent 0%,
    rgba(255, 255, 255, 0.06) 50%,
    transparent 100%
  );
}

.btn--outline-light:hover,
.btn--outline-white:hover {
  background-color: var(--btn-light-hover-bg);
  border-color: var(--btn-light-border-hover);
  color: var(--color-text-inverse);
  transform: translateY(var(--btn-hover-lift));
  box-shadow: var(--shadow-outline-light);
}

.btn--outline-light:active,
.btn--outline-white:active {
  background-color: var(--btn-light-active-bg);
  border-color: var(--btn-light-border-active);
  transform: translateY(0);
}


/* --- GHOST ---
   Sadece metin, çerçevesiz.
   Kullanım: "Tümünü Gör →", text-only linkler. */
.btn--ghost {
  background-color: transparent;
  color: var(--color-primary-600);
  border-color: transparent;
  padding-left: var(--space-3);
  padding-right: var(--space-3);
}

.btn--ghost::before { display: none; }

.btn--ghost:hover {
  color: var(--color-primary-700);
  background-color: var(--btn-outline-hover-bg);
}

.btn--ghost:active {
  color: var(--color-primary-800);
  background-color: var(--btn-outline-active-bg);
}


/* --- ACCENT ---
   Özel vurgu butonu. Altın tonda — sadece özel promosyonlarda.
   Kullanım: WhatsApp, sınırlı sayıda vurgu. */
.btn--accent {
  background: linear-gradient(135deg, var(--color-accent-400) 0%, var(--color-accent-500) 100%);
  color: var(--color-secondary-900);
  border-color: transparent;
  box-shadow: var(--shadow-accent-sm);
}

.btn--accent:hover {
  background: linear-gradient(135deg, var(--color-accent-300) 0%, var(--color-accent-500) 100%);
  transform: translateY(var(--btn-hover-lift));
  box-shadow: var(--shadow-accent-lg);
}

.btn--accent:active {
  background: linear-gradient(135deg, var(--color-accent-500) 0%, var(--color-accent-600) 100%);
  transform: translateY(0);
  box-shadow: var(--shadow-accent-xs);
}


/* --- WHITE ---
   Koyu arka plan üzerinde beyaz solid buton. Premium CTA.
   Kullanım: Hero CTA, dark section CTA'ları. */
.btn--white {
  background-color: var(--color-neutral-0);
  color: var(--color-primary-600);
  border-color: transparent;
  font-weight: var(--weight-bold);
  box-shadow: var(--shadow-white-sm);
}

.btn--white:hover {
  background-color: var(--color-neutral-0);
  color: var(--color-primary-700);
  transform: translateY(var(--btn-hover-lift));
  box-shadow: var(--shadow-white-lg);
}

.btn--white:active {
  background-color: var(--color-neutral-100);
  color: var(--color-primary-700);
  transform: translateY(0);
  box-shadow: var(--shadow-white-xs);
}


/* ======================================================================
   3. BUTTON SIZES
   ====================================================================== */

.btn--sm {
  padding: 0.5rem 1.25rem;
  font-size: var(--text-xs);
  min-height: 36px;
  letter-spacing: 0.03em;
}

/* .btn (md) → zaten base'de tanımlı */
.btn--md {
  padding: 0.75rem 1.75rem;
  font-size: var(--text-sm);
  min-height: 46px;
}

.btn--lg {
  padding: 0.875rem 2.25rem;
  font-size: var(--text-base);
  min-height: 52px;
  letter-spacing: 0.035em;
}

.btn--xl {
  padding: 1.125rem 2.75rem;
  font-size: var(--text-md);
  min-height: 58px;
  letter-spacing: 0.03em;
}


/* ======================================================================
   4. BUTTON MODIFIERS
   ====================================================================== */

/* Tam genişlik */
.btn--full {
  width: 100%;
}

/* Pill shape zaten base'de → bu eski fallback */
.btn--pill {
  border-radius: var(--radius-full);
}

/* Icon-only button (kare) */
.btn--icon {
  padding: 0.75rem;
  min-height: 46px;
  min-width: 46px;
}

.btn--icon.btn--sm {
  padding: 0.5rem;
  min-height: 36px;
  min-width: 36px;
}

.btn--icon.btn--lg {
  padding: 0.875rem;
  min-height: 52px;
  min-width: 52px;
}


/* ======================================================================
   5. BUTTON ICON (inline icon + text)
   ====================================================================== */

.btn__icon {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 1.15em;
  height: 1.15em;
  flex-shrink: 0;
  transition: transform var(--transition-hover);
}

.btn__icon svg {
  width: 100%;
  height: 100%;
  fill: none;
  stroke: currentColor;
}

/* Icon sağda */
.btn--icon-right {
  flex-direction: row-reverse;
}

/* Hover'da ikon micro-animation */
.btn:hover .btn__icon {
  transform: scale(1.08);
}


/* ======================================================================
   6. DISABLED STATE
   Tüm varyantlar için geçerli.
   ====================================================================== */

.btn:disabled,
.btn--disabled {
  opacity: 0.45;
  cursor: not-allowed;
  pointer-events: none;
  transform: none !important;
  box-shadow: none !important;
}


/* ======================================================================
   7. LOADING STATE
   ====================================================================== */

.btn--loading {
  position: relative;
  color: transparent !important;
  pointer-events: none;
}

.btn--loading::after {
  content: '';
  position: absolute;
  top: 50%;
  left: 50%;
  width: 1.25em;
  height: 1.25em;
  margin-top: -0.625em;
  margin-left: -0.625em;
  border: 2px solid currentColor;
  border-right-color: transparent;
  border-radius: 50%;
  animation: btn-spin 0.6s linear infinite;
  z-index: 2;
}

/* Primary/secondary loading — beyaz spinner */
.btn--primary.btn--loading::after,
.btn--secondary.btn--loading::after {
  border-color: rgba(255, 255, 255, 0.3);
  border-top-color: #fff;
}

.btn--white.btn--loading::after {
  border-color: rgba(var(--btn-primary-rgb), 0.3);
  border-top-color: var(--color-primary-500);
}

/* Outline loading — primary spinner */
.btn--outline.btn--loading::after,
.btn--ghost.btn--loading::after {
  border-color: rgba(var(--btn-primary-rgb), 0.3);
  border-top-color: var(--color-primary-500);
}

@keyframes btn-spin {
  to { transform: rotate(360deg); }
}

/* Reduced motion */
@media (prefers-reduced-motion: reduce) {
  .btn {
    transition: none;
  }

  .btn--loading::after {
    animation: none;
  }
}


/* ======================================================================
   8. BUTTON GROUP
   Yan yana buton grubu.
   ====================================================================== */

.btn-group {
  display: flex;
  flex-wrap: wrap;
  gap: var(--space-3);
}

.btn-group--center {
  justify-content: center;
}

/* Mobilde full-width stack */
@media (max-width: 479px) {
  .btn-group--stack-mobile {
    flex-direction: column;
  }

  .btn-group--stack-mobile .btn {
    width: 100%;
  }
}


/* ======================================================================
   DARK SECTION — BUTTON OVERRIDES
   Koyu arka planlarda outline stil, hover'da dolgu + glow.
   ====================================================================== */

.section--dark .btn--primary {
  background: transparent;
  color: var(--color-primary-300);
  border: 2px solid rgba(var(--btn-primary-rgb), 0.5);
  box-shadow: 0 0 0 transparent;
}

.section--dark .btn--primary:hover {
  background: linear-gradient(135deg, var(--color-primary-500) 0%, var(--color-primary-600) 100%);
  color: var(--color-neutral-0);
  border-color: transparent;
  transform: translateY(-2px) scale(1.03);
  box-shadow:
    0 8px 30px rgba(var(--btn-primary-rgb), 0.50),
    0 0 0 5px rgba(var(--btn-primary-rgb), 0.15);
}

.section--dark .btn--primary:active {
  background: linear-gradient(135deg, var(--color-primary-600) 0%, var(--color-primary-700) 100%);
  color: var(--color-neutral-0);
  border-color: transparent;
  transform: translateY(0) scale(1);
  box-shadow: 0 4px 14px rgba(var(--btn-primary-rgb), 0.35);
}