/*
 * buttons.css
 * Biharibuilder Design System — Button System
 * Version: 1.0
 *
 * All button variants. Never create custom buttons outside this system.
 *
 * Button hierarchy:
 *   .btn              — base
 *   .btn-primary      — Copper bg, white text (primary CTA)
 *   .btn-secondary    — White bg, Copper border & text
 *   .btn-outline      — Transparent, Copper text, underline hover (ghost)
 *   .btn-icon         — Circle icon button
 *
 * Size modifiers:
 *   .btn-large        — taller, more padding
 *   .btn-small        — compact
 *   .btn-full         — full width
 *
 * State modifiers:
 *   .btn-loading      — shows spinner
 *   :disabled         — reduced opacity, no interaction
 */

/* =========================================================
   BASE BUTTON
   ========================================================= */

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

  height: var(--form-input-height); /* 52px */
  padding-inline: var(--space-8);   /* 32px */

  font-family: var(--font-body);
  font-size: var(--text-small);     /* 16px */
  font-weight: var(--weight-semibold);
  letter-spacing: var(--tracking-wide);
  white-space: nowrap;
  line-height: 1;

  border: 2px solid transparent;
  border-radius: var(--radius-btn);  /* 12px */
  cursor: pointer;
  position: relative;
  overflow: hidden;
  text-decoration: none;
  user-select: none;

  transition:
    background-color var(--transition-btn),
    border-color     var(--transition-btn),
    color            var(--transition-btn),
    box-shadow       var(--transition-btn),
    transform        var(--transition-btn);
}

/* Focus state — copper outline */
.btn:focus-visible {
  outline: 2px solid var(--border-focus);
  outline-offset: 3px;
}

/* Disabled state */
.btn:disabled,
.btn[disabled],
.btn[aria-disabled="true"] {
  opacity: 0.5;
  cursor: not-allowed;
  pointer-events: none;
}

/* =========================================================
   PRIMARY BUTTON — Copper background, white text
   ========================================================= */

.btn-primary {
  background-color: var(--color-copper);
  border-color: var(--color-copper);
  color: var(--color-white);
  box-shadow: var(--shadow-btn);
}

.btn-primary:hover {
  background-color: var(--color-copper-dark);
  border-color: var(--color-copper-dark);
  transform: translateY(-2px);
  box-shadow: 0 8px 24px rgba(180, 100, 60, 0.35);
}

.btn-primary:active {
  transform: translateY(0);
  box-shadow: var(--shadow-btn);
}

/* =========================================================
   SECONDARY BUTTON — White bg, Copper border & text
   ========================================================= */

.btn-secondary {
  background-color: var(--color-white);
  border-color: var(--color-copper);
  color: var(--color-copper);
}

.btn-secondary:hover {
  background-color: var(--color-sand);
  transform: translateY(-2px);
  box-shadow: var(--shadow-sm);
}

.btn-secondary:active {
  transform: translateY(0);
  box-shadow: none;
}

/* Dark section variant of secondary */
.section--dark .btn-secondary,
.bg-dark .btn-secondary {
  background-color: transparent;
  border-color: rgba(255, 255, 255, 0.5);
  color: var(--color-white);
}

.section--dark .btn-secondary:hover,
.bg-dark .btn-secondary:hover {
  background-color: rgba(255, 255, 255, 0.1);
  border-color: var(--color-white);
}

/* =========================================================
   OUTLINE / GHOST BUTTON — Transparent, copper text
   ========================================================= */

.btn-outline {
  background-color: transparent;
  border-color: transparent;
  color: var(--color-copper);
  padding-inline: var(--space-4);
  height: auto;
  min-height: 44px;
}

.btn-outline::after {
  content: '';
  position: absolute;
  bottom: 6px;
  left: var(--space-4);
  right: var(--space-4);
  height: 1px;
  background: var(--color-copper);
  transform: scaleX(0);
  transform-origin: left;
  transition: transform var(--transition-normal);
}

.btn-outline:hover::after {
  transform: scaleX(1);
}

.btn-outline:hover {
  color: var(--color-copper-dark);
  transform: none;
}

/* =========================================================
   ICON BUTTON — Circle button for WhatsApp, Phone, Social
   ========================================================= */

.btn-icon {
  width: var(--fab-size);   /* 60px */
  height: var(--fab-size);
  min-width: var(--fab-size);
  border-radius: var(--radius-round);
  padding: 0;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  background-color: var(--color-copper);
  border-color: var(--color-copper);
  color: var(--color-white);
  box-shadow: var(--shadow-md);
  transition:
    transform    var(--transition-btn),
    box-shadow   var(--transition-btn);
}

.btn-icon:hover {
  transform: scale(1.08);
  box-shadow: var(--shadow-lg);
}

.btn-icon:active {
  transform: scale(0.97);
}

/* WhatsApp specific */
.btn-icon--whatsapp {
  background-color: #25D366;
  border-color: #25D366;
}

.btn-icon--whatsapp:hover {
  background-color: #20BA58;
  border-color: #20BA58;
}

/* Phone specific */
.btn-icon--phone {
  background-color: var(--color-copper);
  border-color: var(--color-copper);
}

/* =========================================================
   SIZE MODIFIERS
   ========================================================= */

/* Large — for hero CTAs */
.btn-large {
  height: 60px;
  padding-inline: var(--space-10);  /* 40px */
  font-size: 1.0625rem;             /* 17px */
}

/* Small — for inline links and compact UIs */
.btn-small {
  height: 40px;
  padding-inline: var(--space-6);   /* 24px */
  font-size: var(--text-caption);   /* 14px */
  border-radius: var(--radius-sm);  /* 8px */
}

/* Full width */
.btn-full {
  width: 100%;
  justify-content: center;
}

/* =========================================================
   LOADING STATE — Spinning indicator
   ========================================================= */

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

.btn-loading::after {
  content: '';
  position: absolute;
  inset: 0;
  margin: auto;
  width: 20px;
  height: 20px;
  border: 2px solid rgba(255, 255, 255, 0.3);
  border-top-color: white;
  border-radius: 50%;
  animation: spin 0.6s linear infinite;
}

/* =========================================================
   BUTTON GROUPS — side by side
   ========================================================= */

.btn-group {
  display: flex;
  flex-wrap: wrap;
  gap: var(--space-4);
  align-items: center;
}

/* Full-width buttons on mobile */
@media (max-width: 575px) {
  .btn-group--mobile-full .btn {
    width: 100%;
  }
}