/**
 * Unified Button System
 * A professional, consistent button system for SaaS applications.
 * 
 * Core Button Variants:
 * 1. btn-primary   - Main actions (save, submit, create) - Accent colored
 * 2. btn / btn-secondary - Standard actions (cancel, back) - Neutral
 * 3. btn-danger     - Destructive actions (delete) - Red
 * 4. btn-ghost     - Tertiary/subtle actions (links, close)
 * 
 * Additional Variants:
 * - btn-green      - Positive/confirm actions
 * - btn-warning    - Warning/archive actions
 * - btn-add       - Create/add actions with success tint
 * - btn-outline   - Bordered transparent button
 * 
 * Modifiers:
 * - btn-sm         - Smaller size
 * - btn-lg         - Larger size  
 * - btn-block      - Full width
 * - icon-btn       - Icon-only button (square)
 */

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

.btn,
.btn-primary,
.btn-secondary,
.btn-danger,
.btn-green,
.btn-warning,
.btn-add,
.btn-outline {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 0.5rem;
  /* Vertical padding intentionally zero — height is driven entirely by
     min-height/--btn-height so buttons sit on the same baseline as inputs,
     selects, and tab-switches in shared rows. align-items: center keeps
     content vertically centered inside the box. */
  padding: 0 var(--btn-padding-x);
  min-height: var(--btn-height);
  border-radius: var(--btn-radius);
  font-weight: var(--btn-font-weight);
  font-size: 0.9375rem;
  line-height: 1.2;
  text-decoration: none;
  white-space: nowrap;
  cursor: pointer;
  position: relative;
  isolation: isolate;
  transition:
    background-color var(--anim-duration-fast) var(--anim-ease-standard),
    border-color var(--anim-duration-fast) var(--anim-ease-standard),
    color var(--anim-duration-fast) var(--anim-ease-standard),
    box-shadow var(--anim-duration-fast) var(--anim-ease-standard),
    transform var(--anim-duration-micro) var(--anim-ease-standard);
}

/* Reset native button styles */
button.btn,
button.btn-primary,
button.btn-secondary,
button.btn-danger,
button.btn-green,
button.btn-warning,
button.btn-add,
input[type="button"],
input[type="submit"],
input[type="reset"] {
  border: none;
  background: none;
  font-family: inherit;
}

/* ============================================
 * SECONDARY BUTTON (Default .btn)
 * Neutral, outlined appearance for standard actions
 * ============================================ */

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

.btn:hover,
.btn-secondary:hover {
  background: color-mix(in srgb, var(--btn-secondary-bg) 85%, var(--color-accent) 15%);
  border-color: color-mix(in srgb, var(--color-accent) 40%, var(--color-border) 60%);
  color: var(--color-text);
}

.btn:active,
.btn-secondary:active {
  transform: translateY(1px);
}

/* ============================================
 * PRIMARY BUTTON
 * Main call-to-action with accent color
 * ============================================ */

.btn-primary {
  background: var(--btn-primary-bg);
  border: var(--btn-primary-border);
  color: var(--btn-primary-text);
  box-shadow:
    0 2px 4px rgba(0, 0, 0, 0.15),
    0 0 0 1px color-mix(in srgb, var(--color-accent) 20%, transparent);
}

.btn-primary:hover {
  background: var(--btn-primary-hover-bg);
  border-color: var(--color-accent);
  color: var(--btn-primary-text);
  box-shadow:
    0 4px 8px rgba(0, 0, 0, 0.2),
    0 0 0 1px color-mix(in srgb, var(--color-accent) 30%, transparent);
}

.btn-primary:active {
  transform: translateY(1px);
}

/* ============================================
 * DANGER BUTTON (Red/Destructive)
 * For delete, remove, or destructive actions
 * ============================================ */

.btn-danger {
  background: color-mix(in srgb, var(--color-card) 88%, var(--color-error) 12%);
  border: 1px solid color-mix(in srgb, var(--color-error) 45%, var(--color-border) 55%);
  color: color-mix(in srgb, var(--color-text) 85%, var(--color-error) 15%);
}

.btn-danger:hover {
  background: color-mix(in srgb, var(--color-card) 78%, var(--color-error) 22%);
  border-color: color-mix(in srgb, var(--color-error) 60%, var(--color-border) 40%);
  color: color-mix(in srgb, var(--color-text) 80%, var(--color-error) 20%);
}

.btn-danger:active {
  transform: translateY(1px);
}

/* ============================================
 * SUCCESS BUTTON (Green)
 * For positive/confirm actions
 * ============================================ */

.btn-green {
  background: color-mix(in srgb, var(--color-card) 88%, var(--color-success) 12%);
  border: 1px solid color-mix(in srgb, var(--color-success) 45%, var(--color-border) 55%);
  color: color-mix(in srgb, var(--color-text) 85%, var(--color-success) 15%);
}

.btn-green:hover {
  background: color-mix(in srgb, var(--color-card) 78%, var(--color-success) 22%);
  border-color: color-mix(in srgb, var(--color-success) 60%, var(--color-border) 40%);
  color: color-mix(in srgb, var(--color-text) 80%, var(--color-success) 20%);
}

.btn-green:active {
  transform: translateY(1px);
}

/* ============================================
 * WARNING/ARCHIVE BUTTON (Orange/Yellow)
 * For archive, warning actions
 * ============================================ */

.btn-warning {
  background: color-mix(in srgb, var(--color-card) 88%, var(--color-warning) 12%);
  border: 1px solid color-mix(in srgb, var(--color-warning) 50%, var(--color-border) 50%);
  color: color-mix(in srgb, var(--color-text) 85%, var(--color-warning) 15%);
}

.btn-warning:hover {
  background: color-mix(in srgb, var(--color-card) 78%, var(--color-warning) 22%);
  border-color: color-mix(in srgb, var(--color-warning) 65%, var(--color-border) 35%);
  color: color-mix(in srgb, var(--color-text) 80%, var(--color-warning) 20%);
}

.btn-warning:active {
  transform: translateY(1px);
}

/* ============================================
 * ADD/CREATE BUTTON (Special primary variant)
 * For prominent create/add actions
 * ============================================ */

.btn-add {
  background: color-mix(in srgb, var(--color-card) 84%, var(--color-success) 16%);
  border: 1px solid color-mix(in srgb, var(--color-success) 40%, var(--color-border) 60%);
  color: color-mix(in srgb, var(--color-text) 88%, var(--color-success) 12%);
}

.btn-add:hover {
  background: color-mix(in srgb, var(--color-card) 76%, var(--color-success) 24%);
  border-color: color-mix(in srgb, var(--color-success) 55%, var(--color-border) 45%);
  color: color-mix(in srgb, var(--color-text) 85%, var(--color-success) 15%);
}

.btn-add:active {
  transform: translateY(1px);
}

/* ============================================
 * GHOST BUTTON
 * Minimal, text-like button for tertiary actions
 * ============================================ */

.btn-ghost {
  display: inline-flex;
  align-items: center;
  gap: 0.35rem;
  padding: 0.4rem 0.65rem;
  min-height: auto;
  border: none;
  border-radius: var(--btn-radius);
  background: transparent;
  color: var(--color-accent);
  font-weight: 600;
  font-size: 0.9375rem;
  cursor: pointer;
  transition:
    color var(--anim-duration-fast) var(--anim-ease-standard),
    background-color var(--anim-duration-fast) var(--anim-ease-standard);
}

.btn-ghost:hover {
  background: color-mix(in srgb, var(--color-accent) 10%, transparent);
  color: color-mix(in srgb, var(--color-accent) 85%, #ffffff 15%);
}

.btn-ghost:active {
  background: color-mix(in srgb, var(--color-accent) 15%, transparent);
}

/* ============================================
 * OUTLINE BUTTON
 * Bordered variant with transparent background
 * ============================================ */

.btn-outline,
.btn.btn-outline {
  background: transparent;
  border: 1px solid var(--color-border);
  color: var(--color-text);
}

.btn-outline:hover,
.btn.btn-outline:hover {
  background: color-mix(in srgb, var(--color-card) 50%, transparent);
  border-color: color-mix(in srgb, var(--color-accent) 35%, var(--color-border) 65%);
  color: var(--color-text);
}

.btn-outline:active,
.btn.btn-outline:active {
  transform: translateY(1px);
}

/* ============================================
 * ICON BUTTON
 * Square button for icon-only actions
 * ============================================ */

.icon-btn,
.btn.icon-btn {
  width: var(--btn-height);
  min-width: var(--btn-height);
  height: var(--btn-height);
  padding: 0;
  border-radius: var(--btn-radius);
  background: var(--btn-secondary-bg);
  border: var(--btn-secondary-border);
  color: var(--color-muted);
}

.icon-btn:hover,
.btn.icon-btn:hover {
  background: color-mix(in srgb, var(--btn-secondary-bg) 85%, var(--color-accent) 15%);
  border-color: color-mix(in srgb, var(--color-accent) 40%, var(--color-border) 60%);
  color: var(--color-text);
}

.icon-btn:active,
.btn.icon-btn:active {
  transform: translateY(1px);
}

.icon-btn iconify-icon,
.btn iconify-icon {
  width: 1.15em;
  height: 1.15em;
  flex-shrink: 0;
  position: relative;
  z-index: 1;
}

/* ============================================
 * BUTTON STATES
 * ============================================ */

/* Disabled state */
.btn[disabled],
.btn-primary[disabled],
.btn-secondary[disabled],
.btn-danger[disabled],
.btn-green[disabled],
.btn-warning[disabled],
.btn-add[disabled],
.btn-ghost[disabled],
.btn-outline[disabled],
.icon-btn[disabled] {
  cursor: not-allowed;
  opacity: 0.5;
  pointer-events: none;
  transform: none;
}

/* Focus visible state */
.btn:focus-visible,
.btn-primary:focus-visible,
.btn-secondary:focus-visible,
.btn-danger:focus-visible,
.btn-green:focus-visible,
.btn-warning:focus-visible,
.btn-add:focus-visible,
.btn-ghost:focus-visible,
.btn-outline:focus-visible,
.icon-btn:focus-visible {
  outline: 2px solid var(--color-accent);
  outline-offset: 2px;
}

/* ============================================
 * LOADING STATE
 * ============================================ */

.btn.is-loading,
.btn-primary.is-loading,
.btn-secondary.is-loading,
.btn-danger.is-loading,
.btn-green.is-loading,
.btn-warning.is-loading,
.btn-add.is-loading,
.btn-outline.is-loading {
  pointer-events: none;
  cursor: not-allowed;
  opacity: 0.75;
}

.btn.is-loading .btn-text,
.btn-primary.is-loading .btn-text,
.btn-secondary.is-loading .btn-text,
.btn-danger.is-loading .btn-text,
.btn-green.is-loading .btn-text,
.btn-warning.is-loading .btn-text,
.btn-add.is-loading .btn-text,
.btn-outline.is-loading .btn-text {
  visibility: hidden;
  opacity: 0;
}

.btn-spinner {
  display: none;
  position: absolute;
  width: 18px;
  height: 18px;
  border-radius: 50%;
  border: 2px solid rgba(255, 255, 255, 0.3);
  border-top-color: currentColor;
  animation: btn-spin 0.7s linear infinite;
}

.btn.is-loading .btn-spinner,
.btn-primary.is-loading .btn-spinner,
.btn-secondary.is-loading .btn-spinner,
.btn-danger.is-loading .btn-spinner,
.btn-green.is-loading .btn-spinner,
.btn-warning.is-loading .btn-spinner,
.btn-add.is-loading .btn-spinner,
.btn-outline.is-loading .btn-spinner {
  display: block;
}

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

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

/* Small button */
.btn-sm,
.btn.btn-sm {
  padding: 0 0.85rem;
  min-height: var(--btn-height-sm);
  font-size: 0.875rem;
}

.icon-btn.btn-sm {
  width: var(--btn-height-sm);
  min-width: var(--btn-height-sm);
  height: var(--btn-height-sm);
}

/* Large button */
.btn-lg,
.btn.btn-lg {
  padding: 0 1.5rem;
  min-height: calc(var(--btn-height) + 8px);
  font-size: 1rem;
}

/* Block button (full width) */
.btn-block,
.btn.btn-block {
  width: 100%;
}

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

.btn-group {
  display: inline-flex;
  gap: 0;
}

.btn-group .btn,
.btn-group .btn-primary,
.btn-group .btn-secondary {
  border-radius: 0;
}

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

.btn-group .btn:last-child,
.btn-group .btn-primary:last-child,
.btn-group .btn-secondary:last-child {
  border-top-right-radius: var(--btn-radius);
  border-bottom-right-radius: var(--btn-radius);
}

.btn-group .btn:not(:last-child),
.btn-group .btn-primary:not(:last-child),
.btn-group .btn-secondary:not(:last-child) {
  border-right: none;
}

/* ============================================
 * RESPONSIVE ADJUSTMENTS
 * ============================================ */

@media (max-width: 768px) {
  .btn,
  .btn-primary,
  .btn-secondary,
  .btn-danger,
  .btn-green,
  .btn-warning,
  .btn-add,
  .btn-outline,
  .btn-ghost {
    padding: 0.55rem 1rem;
    font-size: 0.875rem;
  }

  .btn-sm,
  .btn.btn-sm {
    padding: 0.35rem 0.75rem;
    font-size: 0.8125rem;
  }
}

@media (max-width: 480px) {
  .btn,
  .btn-primary,
  .btn-secondary,
  .btn-danger,
  .btn-green,
  .btn-warning,
  .btn-add,
  .btn-outline,
  .btn-ghost {
    white-space: normal;
    text-align: center;
  }
}

/* The large-font "wrap, don't clip" override for buttons now lives once,
   alongside the same rule for badges/pills/tabs, in shared/css/ui-tokens.cfaae6.css. */