/* ============================================================
   COMPONENTS.CSS — Buttons, Cards, Inputs, Modals, Avatars, etc.
   ============================================================ */

/* ── Buttons ────────────────────────────────────────────────── */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: var(--space-2);
  padding: 10px var(--space-5);
  border-radius: var(--radius-full);
  font-size: var(--font-sm);
  font-weight: 600;
  transition: all var(--transition-fast);
  white-space: nowrap;
  user-select: none;
  position: relative;
  overflow: hidden;
}

.btn::after {
  content: '';
  position: absolute;
  inset: 0;
  background: white;
  opacity: 0;
  transition: opacity var(--transition-fast);
}

.btn:hover::after  { opacity: 0.06; }
.btn:active::after { opacity: 0.14; }

.btn:disabled {
  opacity: 0.45;
  cursor: not-allowed;
  pointer-events: none;
}

.btn-primary {
  background: var(--grad-primary);
  color: #fff;
  box-shadow: 0 4px 16px var(--color-primary-glow);
}
.btn-primary:hover {
  box-shadow: 0 6px 24px var(--color-primary-glow);
  transform: translateY(-1px);
}

.btn-secondary {
  background: var(--color-surface);
  color: var(--color-text);
  border: 1px solid var(--color-border-2);
}
.btn-secondary:hover {
  background: var(--color-bg-3);
  border-color: var(--color-primary);
}

.btn-ghost {
  background: transparent;
  color: var(--color-text-2);
  padding: 8px var(--space-4);
}
.btn-ghost:hover {
  background: var(--color-surface);
  color: var(--color-text);
}

.btn-danger {
  background: linear-gradient(135deg, #f44336, #e53935);
  color: #fff;
  box-shadow: 0 4px 16px rgba(244,67,54,0.3);
}

.btn-icon {
  width: 38px;
  height: 38px;
  padding: 0;
  border-radius: var(--radius-full);
  background: var(--color-surface);
  color: var(--color-text-2);
  border: 1px solid var(--color-border);
}
.btn-icon:hover {
  background: var(--color-bg-3);
  color: var(--color-primary);
  border-color: var(--color-primary);
}

.btn-sm {
  padding: 6px var(--space-4);
  font-size: var(--font-xs);
}
.btn-lg {
  padding: 14px var(--space-6);
  font-size: var(--font-base);
}

/* Loading spinner on button */
.btn.loading {
  pointer-events: none;
  color: transparent;
}
.btn.loading::before {
  content: '';
  position: absolute;
  width: 16px; height: 16px;
  border: 2px solid rgba(255,255,255,0.3);
  border-top-color: white;
  border-radius: 50%;
  animation: spin 0.7s linear infinite;
}

/* ── Cards ──────────────────────────────────────────────────── */
.card {
  background: var(--grad-card);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
  padding: var(--space-5);
  transition: box-shadow var(--transition-med);
}
.card:hover { box-shadow: var(--shadow-md); }

.card-elevated {
  background: var(--color-bg-card);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
  box-shadow: var(--shadow-sm);
}

/* ── Form Inputs ────────────────────────────────────────────── */
.form-group {
  display: flex;
  flex-direction: column;
  gap: var(--space-2);
}

.form-label {
  font-size: var(--font-sm);
  font-weight: 600;
  color: var(--color-text-2);
  text-transform: uppercase;
  letter-spacing: 0.5px;
}

.form-input {
  width: 100%;
  padding: 12px var(--space-4);
  background: var(--color-surface);
  border: 1px solid var(--color-border-2);
  border-radius: var(--radius-md);
  color: var(--color-text);
  font-size: var(--font-base);
  transition: all var(--transition-fast);
  outline: none;
}

.form-input::placeholder { color: var(--color-text-3); }

.form-input:focus {
  border-color: var(--color-primary);
  box-shadow: 0 0 0 3px var(--color-primary-glow);
  background: var(--color-bg-3);
}

.form-input.error {
  border-color: var(--color-error);
  box-shadow: 0 0 0 3px rgba(244,67,54,0.15);
}

.form-textarea {
  resize: vertical;
  min-height: 90px;
}

.form-error {
  font-size: var(--font-xs);
  color: var(--color-error);
  margin-top: var(--space-1);
}

/* ── Avatar ─────────────────────────────────────────────────── */
.avatar {
  border-radius: 50%;
  object-fit: cover;
  background: var(--color-surface);
  flex-shrink: 0;
}
.avatar-xs  { width: 28px;  height: 28px; }
.avatar-sm  { width: 36px;  height: 36px; }
.avatar-md  { width: 44px;  height: 44px; }
.avatar-lg  { width: 64px;  height: 64px; }
.avatar-xl  { width: 96px;  height: 96px; }
.avatar-2xl { width: 128px; height: 128px; }

.avatar-wrapper {
  position: relative;
  display: inline-block;
}
.avatar-badge {
  position: absolute;
  bottom: 1px; right: 1px;
  width: 11px; height: 11px;
  border-radius: 50%;
  border: 2px solid var(--color-bg);
  background: var(--color-online);
}
.avatar-badge.offline { background: var(--color-offline); }

/* ── Modal ──────────────────────────────────────────────────── */
.modal-overlay {
  position: fixed;
  inset: 0;
  background: rgba(0,0,0,0.7);
  backdrop-filter: blur(6px);
  z-index: 1000;
  display: flex;
  align-items: center;
  justify-content: center;
  padding: var(--space-4);
  opacity: 0;
  animation: fadeIn 200ms forwards;
}

.modal {
  background: var(--color-bg-card);
  border: 1px solid var(--color-border-2);
  border-radius: var(--radius-xl);
  padding: var(--space-6);
  width: 100%;
  max-width: 520px;
  max-height: 90vh;
  overflow-y: auto;
  box-shadow: var(--shadow-lg);
  animation: scaleIn 200ms forwards;
}

.modal-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  margin-bottom: var(--space-5);
}

.modal-title {
  font-size: var(--font-lg);
  font-weight: 700;
}

.modal-close {
  width: 32px; height: 32px;
  border-radius: 50%;
  background: var(--color-surface);
  color: var(--color-text-2);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 18px;
  transition: all var(--transition-fast);
  cursor: pointer;
  border: none;
}
.modal-close:hover {
  background: var(--color-error);
  color: white;
}

/* ── Toast notifications ─────────────────────────────────────── */
#toast-container {
  position: fixed;
  bottom: var(--space-5);
  right: var(--space-5);
  z-index: 9999;
  display: flex;
  flex-direction: column;
  gap: var(--space-2);
  pointer-events: none;
}

.toast {
  display: flex;
  align-items: center;
  gap: var(--space-3);
  background: var(--color-bg-card);
  border: 1px solid var(--color-border-2);
  border-radius: var(--radius-md);
  padding: var(--space-3) var(--space-4);
  box-shadow: var(--shadow-lg);
  pointer-events: all;
  animation: slideInRight 250ms forwards;
  min-width: 280px;
  max-width: 360px;
}
.toast.removing {
  animation: fadeIn 200ms reverse forwards;
}
.toast-icon { font-size: 20px; }
.toast-message { font-size: var(--font-sm); flex: 1; }
.toast.success .toast-icon::before { content: '✅'; }
.toast.error   .toast-icon::before { content: '❌'; }
.toast.info    .toast-icon::before { content: 'ℹ️'; }
.toast.warning .toast-icon::before { content: '⚠️'; }
.toast.success { border-left: 3px solid var(--color-success); }
.toast.error   { border-left: 3px solid var(--color-error); }
.toast.info    { border-left: 3px solid var(--color-info); }
.toast.warning { border-left: 3px solid var(--color-warning); }

/* ── Dropdown ───────────────────────────────────────────────── */
.dropdown {
  position: relative;
}
.dropdown-menu {
  position: absolute;
  top: calc(100% + 6px);
  right: 0;
  background: var(--color-bg-card);
  border: 1px solid var(--color-border-2);
  border-radius: var(--radius-md);
  box-shadow: var(--shadow-lg);
  min-width: 180px;
  z-index: 200;
  animation: scaleIn 150ms forwards;
  transform-origin: top right;
  overflow: hidden;
}
.dropdown-item {
  display: flex;
  align-items: center;
  gap: var(--space-3);
  padding: 10px var(--space-4);
  font-size: var(--font-sm);
  color: var(--color-text);
  cursor: pointer;
  transition: background var(--transition-fast);
  border: none;
  background: none;
  width: 100%;
  text-align: left;
}
.dropdown-item:hover { background: var(--color-surface); }
.dropdown-item.danger { color: var(--color-error); }
.dropdown-divider {
  height: 1px;
  background: var(--color-border);
  margin: var(--space-1) 0;
}

/* ── Badges ─────────────────────────────────────────────────── */
.badge {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-width: 20px;
  height: 20px;
  padding: 0 6px;
  background: var(--color-primary);
  color: white;
  font-size: var(--font-xs);
  font-weight: 700;
  border-radius: var(--radius-full);
  line-height: 1;
}
.badge.danger { background: var(--color-error); }

/* ── Tabs ────────────────────────────────────────────────────── */
.tabs {
  display: flex;
  gap: 2px;
  background: var(--color-surface);
  border-radius: var(--radius-full);
  padding: 4px;
}
.tab {
  flex: 1;
  padding: 8px var(--space-4);
  border-radius: var(--radius-full);
  font-size: var(--font-sm);
  font-weight: 500;
  color: var(--color-text-2);
  text-align: center;
  cursor: pointer;
  transition: all var(--transition-fast);
  border: none;
  background: none;
}
.tab.active {
  background: var(--color-primary);
  color: white;
  box-shadow: 0 2px 8px var(--color-primary-glow);
}
.tab:hover:not(.active) {
  background: var(--color-bg-3);
  color: var(--color-text);
}

/* ── Divider ─────────────────────────────────────────────────── */
.divider {
  height: 1px;
  background: var(--color-border);
  margin: var(--space-4) 0;
}

/* ── Empty state ─────────────────────────────────────────────── */
.empty-state {
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  gap: var(--space-3);
  padding: var(--space-8) var(--space-5);
  color: var(--color-text-3);
  text-align: center;
}
.empty-state-icon {
  font-size: 48px;
  opacity: 0.4;
}
.empty-state-title {
  font-size: var(--font-md);
  font-weight: 600;
  color: var(--color-text-2);
}

/* ── Spinner ─────────────────────────────────────────────────── */
.spinner {
  width: 36px; height: 36px;
  border: 3px solid var(--color-border-2);
  border-top-color: var(--color-primary);
  border-radius: 50%;
  animation: spin 0.8s linear infinite;
}
.spinner-sm { width: 20px; height: 20px; border-width: 2px; }

/* ── Reaction bar ────────────────────────────────────────────── */
.reaction-bar {
  display: flex;
  gap: var(--space-1);
  flex-wrap: wrap;
}
.reaction-btn {
  display: inline-flex;
  align-items: center;
  gap: 4px;
  padding: 4px 10px;
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-full);
  font-size: var(--font-sm);
  cursor: pointer;
  transition: all var(--transition-fast);
  color: var(--color-text-2);
}
.reaction-btn:hover,
.reaction-btn.active {
  background: var(--color-primary-glow);
  border-color: var(--color-primary);
  color: var(--color-primary);
}

/* ── Image modal (lightbox) ──────────────────────────────────── */
#lightbox {
  position: fixed;
  inset: 0;
  z-index: 2000;
  background: rgba(0,0,0,0.92);
  display: none;
  align-items: center;
  justify-content: center;
}
#lightbox.open { display: flex; }
#lightbox img {
  max-width: 90vw;
  max-height: 90vh;
  border-radius: var(--radius-md);
  box-shadow: var(--shadow-lg);
}
#lightbox-close {
  position: absolute;
  top: var(--space-4);
  right: var(--space-4);
  font-size: 28px;
  color: white;
  cursor: pointer;
  opacity: 0.7;
}
#lightbox-close:hover { opacity: 1; }

/* ── Upload area ─────────────────────────────────────────────── */
.upload-area {
  border: 2px dashed var(--color-border-2);
  border-radius: var(--radius-md);
  padding: var(--space-6);
  text-align: center;
  cursor: pointer;
  transition: all var(--transition-fast);
  color: var(--color-text-3);
}
.upload-area:hover,
.upload-area.dragover {
  border-color: var(--color-primary);
  background: var(--color-primary-glow);
  color: var(--color-primary);
}
.upload-area input[type=file] { display: none; }

/* ── Progress bar ────────────────────────────────────────────── */
.progress-bar {
  height: 4px;
  background: var(--color-border-2);
  border-radius: var(--radius-full);
  overflow: hidden;
}
.progress-bar-fill {
  height: 100%;
  background: var(--grad-primary);
  border-radius: var(--radius-full);
  transition: width var(--transition-med);
}