/* ============================================
   BLUEPRINT THEME - BUTTON SYSTEM
   ============================================
   
   Based on Foundation/W3C CSS patterns
   Features:
   - CSS Custom Properties for easy customization
   - Dark Mode support
   - Multiple color variants (primary, secondary, success, warning, danger, info)
   - Multiple sizes (tiny, small, normal, large, xlarge)
   - Multiple styles (solid, hollow, clear)
   - Special states (expanded, rounded, disabled)
   - Button groups
   ============================================ */

/* ============================================
   CSS CUSTOM PROPERTIES (VARIABLES)
   ============================================ */

:root {
  /* Primary Colors */
  --btn-primary: #2c3e50;
  --btn-primary-hover: #1a252f;
  --btn-primary-text: #ffffff;
  
  /* Secondary Colors */
  --btn-secondary: #95a5a6;
  --btn-secondary-hover: #7f8c8d;
  --btn-secondary-text: #ffffff;
  
  /* Success Colors */
  --btn-success: #27ae60;
  --btn-success-hover: #229954;
  --btn-success-text: #ffffff;
  
  /* Warning Colors */
  --btn-warning: #f39c12;
  --btn-warning-hover: #e67e22;
  --btn-warning-text: #ffffff;
  
  /* Danger Colors */
  --btn-danger: #e74c3c;
  --btn-danger-hover: #c0392b;
  --btn-danger-text: #ffffff;
  
  /* Info Colors */
  --btn-info: #3498db;
  --btn-info-hover: #2980b9;
  --btn-info-text: #ffffff;
  
  /* Button Settings */
  --btn-border-radius: 0px;
  --btn-border-width: 2px;
  --btn-transition: all 0.3s ease;
  
  /* Sizes */
  --btn-padding-tiny: 0.4rem 0.8rem;
  --btn-font-size-tiny: 0.75rem;
  
  --btn-padding-small: 0.6rem 1.2rem;
  --btn-font-size-small: 0.875rem;
  
  --btn-padding-normal: 0.8rem 1.6rem;
  --btn-font-size-normal: 1rem;
  
  --btn-padding-large: 1rem 2rem;
  --btn-font-size-large: 1.125rem;
  
  --btn-padding-xlarge: 1.2rem 2.4rem;
  --btn-font-size-xlarge: 1.25rem;
  
  /* Disabled State */
  --btn-disabled-opacity: 0.5;
  --btn-disabled-cursor: not-allowed;
}

/* Dark Mode Variables */
[data-theme="dark"],
.dark-mode {
  --btn-primary: #3498db;
  --btn-primary-hover: #2980b9;
  --btn-primary-text: #ffffff;
  
  --btn-secondary: #7f8c8d;
  --btn-secondary-hover: #95a5a6;
  --btn-secondary-text: #ffffff;
  
  --btn-success: #2ecc71;
  --btn-success-hover: #27ae60;
  --btn-success-text: #ffffff;
  
  --btn-warning: #f1c40f;
  --btn-warning-hover: #f39c12;
  --btn-warning-text: #2c3e50;
  
  --btn-danger: #e74c3c;
  --btn-danger-hover: #c0392b;
  --btn-danger-text: #ffffff;
  
  --btn-info: #3498db;
  --btn-info-hover: #5dade2;
  --btn-info-text: #ffffff;
}

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

.btn,
.button {
  display: inline-block;
  padding: var(--btn-padding-normal);
  font-size: var(--btn-font-size-normal);
  font-weight: 600;
  line-height: 1.5;
  text-align: center;
  text-decoration: none;
  vertical-align: middle;
  cursor: pointer;
  user-select: none;
  border: var(--btn-border-width) solid transparent;
  border-radius: var(--btn-border-radius);
  transition: var(--btn-transition);
  background-color: var(--btn-primary);
  color: var(--btn-primary-text);
  border-color: var(--btn-primary);
  font-family: inherit;
  -webkit-appearance: none;
  -moz-appearance: none;
  appearance: none;
}

.btn:hover,
.button:hover {
  background-color: var(--btn-primary-hover);
  border-color: var(--btn-primary-hover);
  text-decoration: none;
  transform: translateY(-1px);
  box-shadow: 0 4px 8px rgba(0, 0, 0, 0.15);
}

.btn:active,
.button:active {
  transform: translateY(0);
  box-shadow: 0 2px 4px rgba(0, 0, 0, 0.15);
}

.btn:focus,
.button:focus {
  outline: none;
  box-shadow: 0 0 0 3px rgba(52, 152, 219, 0.25);
}

/* ============================================
   COLOR VARIANTS - SOLID STYLE
   ============================================ */

.btn-primary {
  background-color: var(--btn-primary);
  color: var(--btn-primary-text);
  border-color: var(--btn-primary);
}

.btn-primary:hover {
  background-color: var(--btn-primary-hover);
  border-color: var(--btn-primary-hover);
}

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

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

.btn-success {
  background-color: var(--btn-success);
  color: var(--btn-success-text);
  border-color: var(--btn-success);
}

.btn-success:hover {
  background-color: var(--btn-success-hover);
  border-color: var(--btn-success-hover);
}

.btn-warning {
  background-color: var(--btn-warning);
  color: var(--btn-warning-text);
  border-color: var(--btn-warning);
}

.btn-warning:hover {
  background-color: var(--btn-warning-hover);
  border-color: var(--btn-warning-hover);
}

.btn-danger {
  background-color: var(--btn-danger);
  color: var(--btn-danger-text);
  border-color: var(--btn-danger);
}

.btn-danger:hover {
  background-color: var(--btn-danger-hover);
  border-color: var(--btn-danger-hover);
}

.btn-info {
  background-color: var(--btn-info);
  color: var(--btn-info-text);
  border-color: var(--btn-info);
}

.btn-info:hover {
  background-color: var(--btn-info-hover);
  border-color: var(--btn-info-hover);
}

/* ============================================
   HOLLOW/OUTLINE STYLE
   ============================================ */

.btn-hollow,
.btn-outline {
  background-color: transparent;
  border-width: var(--btn-border-width);
}

.btn-hollow.btn-primary,
.btn-outline.btn-primary {
  color: var(--btn-primary);
  border-color: var(--btn-primary);
}

.btn-hollow.btn-primary:hover,
.btn-outline.btn-primary:hover {
  background-color: var(--btn-primary);
  color: var(--btn-primary-text);
}

.btn-hollow.btn-secondary,
.btn-outline.btn-secondary {
  color: var(--btn-secondary);
  border-color: var(--btn-secondary);
}

.btn-hollow.btn-secondary:hover,
.btn-outline.btn-secondary:hover {
  background-color: var(--btn-secondary);
  color: var(--btn-secondary-text);
}

.btn-hollow.btn-success,
.btn-outline.btn-success {
  color: var(--btn-success);
  border-color: var(--btn-success);
}

.btn-hollow.btn-success:hover,
.btn-outline.btn-success:hover {
  background-color: var(--btn-success);
  color: var(--btn-success-text);
}

.btn-hollow.btn-warning,
.btn-outline.btn-warning {
  color: var(--btn-warning);
  border-color: var(--btn-warning);
}

.btn-hollow.btn-warning:hover,
.btn-outline.btn-warning:hover {
  background-color: var(--btn-warning);
  color: var(--btn-warning-text);
}

.btn-hollow.btn-danger,
.btn-outline.btn-danger {
  color: var(--btn-danger);
  border-color: var(--btn-danger);
}

.btn-hollow.btn-danger:hover,
.btn-outline.btn-danger:hover {
  background-color: var(--btn-danger);
  color: var(--btn-danger-text);
}

.btn-hollow.btn-info,
.btn-outline.btn-info {
  color: var(--btn-info);
  border-color: var(--btn-info);
}

.btn-hollow.btn-info:hover,
.btn-outline.btn-info:hover {
  background-color: var(--btn-info);
  color: var(--btn-info-text);
}

/* ============================================
   CLEAR/GHOST STYLE
   ============================================ */

.btn-clear,
.btn-ghost {
  background-color: transparent;
  border-color: transparent;
}

.btn-clear.btn-primary,
.btn-ghost.btn-primary {
  color: var(--btn-primary);
}

.btn-clear.btn-primary:hover,
.btn-ghost.btn-primary:hover {
  background-color: rgba(44, 62, 80, 0.1);
}

.btn-clear.btn-secondary,
.btn-ghost.btn-secondary {
  color: var(--btn-secondary);
}

.btn-clear.btn-secondary:hover,
.btn-ghost.btn-secondary:hover {
  background-color: rgba(149, 165, 166, 0.1);
}

.btn-clear.btn-success,
.btn-ghost.btn-success {
  color: var(--btn-success);
}

.btn-clear.btn-success:hover,
.btn-ghost.btn-success:hover {
  background-color: rgba(39, 174, 96, 0.1);
}

.btn-clear.btn-warning,
.btn-ghost.btn-warning {
  color: var(--btn-warning);
}

.btn-clear.btn-warning:hover,
.btn-ghost.btn-warning:hover {
  background-color: rgba(243, 156, 18, 0.1);
}

.btn-clear.btn-danger,
.btn-ghost.btn-danger {
  color: var(--btn-danger);
}

.btn-clear.btn-danger:hover,
.btn-ghost.btn-danger:hover {
  background-color: rgba(231, 76, 60, 0.1);
}

.btn-clear.btn-info,
.btn-ghost.btn-info {
  color: var(--btn-info);
}

.btn-clear.btn-info:hover,
.btn-ghost.btn-info:hover {
  background-color: rgba(52, 152, 219, 0.1);
}

/* ============================================
   SIZE VARIANTS
   ============================================ */

.btn-tiny {
  padding: var(--btn-padding-tiny);
  font-size: var(--btn-font-size-tiny);
}

.btn-small {
  padding: var(--btn-padding-small);
  font-size: var(--btn-font-size-small);
}

.btn-large {
  padding: var(--btn-padding-large);
  font-size: var(--btn-font-size-large);
}

.btn-xlarge {
  padding: var(--btn-padding-xlarge);
  font-size: var(--btn-font-size-xlarge);
}

/* ============================================
   EXPANDED (FULL WIDTH)
   ============================================ */

.btn-expanded {
  display: block;
  width: 100%;
  margin-left: 0;
  margin-right: 0;
}

/* ============================================
   ROUNDED VARIANT
   ============================================ */

.btn-rounded {
  border-radius: 50px;
}

/* ============================================
   DISABLED STATE
   ============================================ */

.btn:disabled,
.btn.disabled,
.button:disabled,
.button.disabled {
  opacity: var(--btn-disabled-opacity);
  cursor: var(--btn-disabled-cursor);
  pointer-events: none;
}

/* ============================================
   BUTTON GROUPS
   ============================================ */

.btn-group {
  display: inline-flex;
  vertical-align: middle;
}

.btn-group .btn,
.btn-group .button {
  margin-right: -1px;
  border-radius: 0;
}

.btn-group .btn:first-child,
.btn-group .button:first-child {
  border-top-left-radius: var(--btn-border-radius);
  border-bottom-left-radius: var(--btn-border-radius);
}

.btn-group .btn:last-child,
.btn-group .button:last-child {
  border-top-right-radius: var(--btn-border-radius);
  border-bottom-right-radius: var(--btn-border-radius);
  margin-right: 0;
}

.btn-group .btn:hover,
.btn-group .button:hover {
  z-index: 1;
  position: relative;
}

/* Vertical Button Group */
.btn-group-vertical {
  display: inline-flex;
  flex-direction: column;
  vertical-align: middle;
}

.btn-group-vertical .btn,
.btn-group-vertical .button {
  margin-bottom: -1px;
  border-radius: 0;
  width: 100%;
}

.btn-group-vertical .btn:first-child,
.btn-group-vertical .button:first-child {
  border-top-left-radius: var(--btn-border-radius);
  border-top-right-radius: var(--btn-border-radius);
}

.btn-group-vertical .btn:last-child,
.btn-group-vertical .button:last-child {
  border-bottom-left-radius: var(--btn-border-radius);
  border-bottom-right-radius: var(--btn-border-radius);
  margin-bottom: 0;
}

/* ============================================
   ICON BUTTONS
   ============================================ */

.btn-icon {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 0.5rem;
}

.btn-icon-only {
  padding: 0.8rem;
  aspect-ratio: 1;
  display: inline-flex;
  align-items: center;
  justify-content: center;
}

.btn-icon-only.btn-tiny {
  padding: 0.4rem;
}

.btn-icon-only.btn-small {
  padding: 0.6rem;
}

.btn-icon-only.btn-large {
  padding: 1rem;
}

.btn-icon-only.btn-xlarge {
  padding: 1.2rem;
}

/* ============================================
   UTILITY CLASSES
   ============================================ */

.btn-block {
  display: block;
  width: 100%;
}

.btn + .btn,
.button + .button {
  margin-left: 0.5rem;
}

/* Remove margin for buttons in groups */
.btn-group .btn + .btn,
.btn-group .button + .button,
.btn-group-vertical .btn + .btn,
.btn-group-vertical .button + .button {
  margin-left: 0;
}

/* ============================================
   RESPONSIVE HELPERS
   ============================================ */

@media screen and (max-width: 640px) {
  .btn-mobile-expanded {
    display: block;
    width: 100%;
    margin-left: 0;
    margin-right: 0;
  }
  
  .btn-group-mobile-vertical {
    flex-direction: column;
  }
  
  .btn-group-mobile-vertical .btn,
  .btn-group-mobile-vertical .button {
    width: 100%;
    margin-right: 0;
    margin-bottom: -1px;
    border-radius: 0;
  }
  
  .btn-group-mobile-vertical .btn:first-child,
  .btn-group-mobile-vertical .button:first-child {
    border-top-left-radius: var(--btn-border-radius);
    border-top-right-radius: var(--btn-border-radius);
    border-bottom-left-radius: 0;
  }
  
  .btn-group-mobile-vertical .btn:last-child,
  .btn-group-mobile-vertical .button:last-child {
    border-bottom-left-radius: var(--btn-border-radius);
    border-bottom-right-radius: var(--btn-border-radius);
    border-top-right-radius: 0;
    margin-bottom: 0;
  }
}

/* ============================================
   PRINT STYLES
   ============================================ */

@media print {
  .btn,
  .button {
    border: 1px solid #000;
    background: none;
    color: #000;
  }
}