/* =============================================================================
   COMPONENTS.CSS — UI Components Library
   HTTP Learning Portal
   ============================================================================= */

/* =============================================================================
   BUTTONS
   ============================================================================= */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: var(--space-2);
  padding: var(--space-2) var(--space-5);
  border: 1px solid transparent;
  border-radius: var(--radius-lg);
  font-family: var(--font-family-ui);
  font-size: var(--font-size-sm);
  font-weight: var(--font-weight-semibold);
  line-height: 1;
  cursor: pointer;
  transition: all var(--transition-fast);
  white-space: nowrap;
  text-decoration: none;
  position: relative;
  overflow: hidden;
  height: 36px;
}

.btn:hover {
  text-decoration: none;
}

.btn:disabled,
.btn.is-disabled {
  opacity: 0.5;
  cursor: not-allowed;
  pointer-events: none;
}

/* Primary */
.btn--primary {
  background: var(--color-accent-primary);
  color: white;
  border-color: var(--color-accent-primary);
  box-shadow: 0 1px 3px rgba(0,0,0,0.1);
}

.btn--primary:hover {
  background: var(--color-accent-hover);
  border-color: var(--color-accent-hover);
  box-shadow: 0 4px 12px rgba(88, 166, 255, 0.3);
  color: white;
}

/* Secondary */
.btn--secondary {
  background: var(--color-bg-secondary);
  color: var(--color-text-primary);
  border-color: var(--color-border-primary);
}

.btn--secondary:hover {
  background: var(--color-bg-tertiary);
  color: var(--color-text-primary);
}

/* Ghost */
.btn--ghost {
  background: transparent;
  color: var(--color-text-secondary);
  border-color: transparent;
}

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

/* Danger */
.btn--danger {
  background: var(--color-danger);
  color: white;
  border-color: var(--color-danger);
}

/* Size variants */
.btn--sm {
  height: 28px;
  padding: 0 var(--space-3);
  font-size: var(--font-size-xs);
}

.btn--lg {
  height: 44px;
  padding: 0 var(--space-6);
  font-size: var(--font-size-base);
  border-radius: var(--radius-xl);
}

/* Icon-only */
.btn--icon {
  width: 36px;
  height: 36px;
  padding: 0;
  border-radius: var(--radius-md);
}

/* Send Button (special) */
.btn--send {
  background: linear-gradient(135deg, #2ea043, #1a7f37);
  color: white;
  border-color: #2ea043;
  box-shadow: 0 2px 8px rgba(46, 160, 67, 0.3);
  font-family: var(--font-family-mono);
  font-size: var(--font-size-sm);
  letter-spacing: 0.02em;
  margin-bottom: 10px;
}

.btn--send:hover {
  background: linear-gradient(135deg, #3fb950, #2ea043);
  box-shadow: 0 4px 16px rgba(46, 160, 67, 0.4);
  color: white;
  transform: translateY(-1px);
}

.btn--send:active {
  transform: translateY(0);
}

.btn--send.is-loading {
  pointer-events: none;
}

/* =============================================================================
   BADGES / TAGS
   ============================================================================= */
.badge {
  display: inline-flex;
  align-items: center;
  gap: var(--space-1);
  padding: 2px var(--space-2);
  border-radius: var(--radius-sm);
  font-family: var(--font-family-mono);
  font-size: var(--font-size-xs);
  font-weight: var(--font-weight-semibold);
  letter-spacing: 0.05em;
  line-height: 1.5;
  white-space: nowrap;
}

/* Method Badges */
.badge--get     { color: var(--color-method-get);    background: var(--color-method-get-bg); }
.badge--post    { color: var(--color-method-post);   background: var(--color-method-post-bg); }
.badge--put     { color: var(--color-method-put);    background: var(--color-method-put-bg); }
.badge--patch   { color: var(--color-method-patch);  background: var(--color-method-patch-bg); }
.badge--delete  { color: var(--color-method-delete); background: var(--color-method-delete-bg); }
.badge--head    { color: var(--color-method-head);   background: var(--color-method-head-bg); }
.badge--options { color: var(--color-method-options); background: var(--color-method-options-bg); }

/* Status Code Badges */
.badge--1xx { color: var(--color-status-1xx); background: var(--color-status-1xx-bg); }
.badge--2xx { color: var(--color-status-2xx); background: var(--color-status-2xx-bg); }
.badge--3xx { color: var(--color-status-3xx); background: var(--color-status-3xx-bg); }
.badge--4xx { color: var(--color-status-4xx); background: var(--color-status-4xx-bg); }
.badge--5xx { color: var(--color-status-5xx); background: var(--color-status-5xx-bg); }

/* Property Badges */
.badge--safe       { color: #1a7f37; background: #dafbe1; }
.badge--idempotent { color: #9a6700; background: #fff8c5; }
.badge--unsafe     { color: #cf222e; background: #FFEBE9; }
.badge--neutral    { color: var(--color-text-secondary); background: var(--color-bg-tertiary); }

/* Tag (pill-shaped) */
.tag {
  display: inline-flex;
  align-items: center;
  gap: var(--space-1);
  padding: var(--space-1) var(--space-3);
  border-radius: var(--radius-full);
  font-size: var(--font-size-xs);
  font-weight: var(--font-weight-medium);
  background: var(--color-bg-tertiary);
  color: var(--color-text-secondary);
  border: 1px solid var(--color-border-secondary);
}

/* =============================================================================
   CARDS & CONTAINERS
   ============================================================================= */
.card {
  background: var(--color-bg-surface);
  border: 1px solid var(--color-border-primary);
  border-radius: var(--radius-xl);
  overflow: hidden;
  transition: all var(--transition-normal);
  padding: var(--space-5);
}

.card:hover {
  box-shadow: var(--shadow-md);
  border-color: var(--color-border-focus);
}

.content-box {
  padding: var(--space-5);
  background: var(--color-bg-secondary);
  border-radius: var(--radius-xl);
  border: 1px solid var(--color-border-primary);
}

.content-box--get { border-left: 4px solid var(--color-method-get); }
.content-box--post { border-left: 4px solid var(--color-method-post); }
.content-box--put { border-left: 4px solid var(--color-method-put); }
.content-box--delete { border-left: 4px solid var(--color-method-delete); }
.content-box--4xx { border-left: 4px solid var(--color-status-4xx); }
.content-box--5xx { border-left: 4px solid var(--color-status-5xx); }

.grid-2 {
  display: grid;
  grid-template-columns: 1fr;
  gap: var(--space-4);
}

@media (min-width: 768px) {
  .grid-2 {
    grid-template-columns: repeat(2, 1fr);
  }
}

.grid-auto {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(280px, 1fr));
  gap: var(--space-4);
}

/* =============================================================================
   CALLOUTS
   ============================================================================= */
.callout {
  display: flex;
  gap: var(--space-3);
  padding: var(--space-4);
  border-radius: var(--radius-xl);
  border: 1px solid var(--color-border-primary);
}

.callout__icon {
  font-size: 1.5rem;
  flex-shrink: 0;
}

.callout__title {
  font-weight: var(--font-weight-semibold);
  margin-bottom: var(--space-1);
}

.callout__body {
  font-size: var(--font-size-sm);
  color: var(--color-text-secondary);
  line-height: var(--line-height-relaxed);
}

.callout--info {
  background: var(--color-info-bg);
  border-color: var(--color-info);
}

.callout--info .callout__title {
  color: var(--color-info);
}

.callout--warning {
  background: var(--color-warning-bg);
  border-color: var(--color-warning);
}

.callout--warning .callout__title {
  color: var(--color-warning);
}

/* =============================================================================
   CODE BLOCKS
   ============================================================================= */
.code-block {
  background: var(--color-code-bg);
  border: 1px solid var(--color-code-border);
  border-radius: var(--radius-lg);
  overflow: hidden;
  margin-top: var(--space-2);
}

.code-block__header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: var(--space-2) var(--space-3);
  background: rgba(0, 0, 0, 0.03);
  border-bottom: 1px solid var(--color-code-border);
}

[data-theme="dark"] .code-block__header {
  background: rgba(255, 255, 255, 0.05);
}

.code-block__label {
  font-family: var(--font-family-mono);
  font-size: var(--font-size-xs);
  color: var(--color-text-muted);
  text-transform: uppercase;
  letter-spacing: 0.05em;
}

.code-block__copy-btn {
  background: transparent;
  border: none;
  color: var(--color-text-muted);
  font-size: var(--font-size-xs);
  cursor: pointer;
  padding: 2px 6px;
  border-radius: 4px;
}

.code-block__copy-btn:hover {
  background: var(--color-bg-tertiary);
  color: var(--color-text-primary);
}

.code-block__content {
  padding: var(--space-3);
  overflow-x: auto;
  max-width: 100%;
}

.code-block pre {
  margin: 0;
  font-family: var(--font-family-mono);
  font-size: 13px;
  line-height: 1.5;
  color: var(--color-text-primary);
  white-space: pre;
}

@media (max-width: 600px) {
  .code-block pre {
    font-size: 12px;
  }
}

/* HTTP Syntax Highlighting */
.http-method { color: #d2a8ff; font-weight: 600; }
.http-path { color: #79c0ff; }
.http-version { color: #8b949e; }
.http-header-name { color: #ff7b72; }
.http-header-value { color: #a5d6ff; }
.http-comment { color: #8b949e; font-style: italic; }

.http-status-code { font-weight: 600; }
.http-status-1xx { color: var(--color-status-1xx); }
.http-status-2xx { color: var(--color-status-2xx); }
.http-status-3xx { color: var(--color-status-3xx); }
.http-status-4xx { color: var(--color-status-4xx); }
.http-status-5xx { color: var(--color-status-5xx); }

/* JSON Body Highlighting */
.http-body-key { color: #79c0ff; }
.http-body-string { color: #a5d6ff; }
.http-body-number { color: #f2cc60; }
.http-body-bool { color: #ff7b72; }
.http-body-null { color: #8b949e; }

/* =============================================================================
   TOOLTIPS / POPOVERS (Glossary)
   ============================================================================= */
.glossary-term {
  border-bottom: 1px dashed var(--color-accent-primary);
  color: var(--color-accent-primary);
  cursor: help;
  position: relative;
}

.glossary-popover {
  position: absolute;
  z-index: var(--z-index-tooltip);
  width: 280px;
  background: var(--color-bg-surface);
  border: 1px solid var(--color-border-primary);
  border-radius: var(--radius-lg);
  box-shadow: var(--shadow-xl);
  padding: var(--space-4);
  opacity: 0;
  visibility: hidden;
  transform: translateY(8px) scale(0.95);
  transition: all var(--transition-normal) cubic-bezier(0.16, 1, 0.3, 1);
  pointer-events: none;
}

.glossary-popover.is-visible {
  opacity: 1;
  visibility: visible;
  transform: translateY(0) scale(1);
  pointer-events: auto;
}

.glossary-popover__title {
  font-size: var(--font-size-sm);
  font-weight: var(--font-weight-bold);
  color: var(--color-text-primary);
  margin-bottom: var(--space-2);
  display: flex;
  justify-content: space-between;
  align-items: center;
}

.glossary-popover__definition {
  font-size: var(--font-size-sm);
  color: var(--color-text-secondary);
  line-height: 1.5;
  margin-bottom: var(--space-3);
}

.glossary-popover__example {
  background: var(--color-bg-secondary);
  padding: var(--space-2);
  border-radius: var(--radius-sm);
  font-family: var(--font-family-mono);
  font-size: var(--font-size-xs);
  color: var(--color-text-secondary);
}

.glossary-popover__close {
  background: transparent;
  border: none;
  color: var(--color-text-muted);
  cursor: pointer;
  font-size: 16px;
  line-height: 1;
}

/* =============================================================================
   NETWORK DIAGRAM
   ============================================================================= */
.network-flow {
  display: flex;
  align-items: center;
  justify-content: space-between;
  width: 100%;
  padding: var(--space-3) var(--space-4);
  background: var(--color-bg-secondary);
  border-radius: var(--radius-xl);
  border: 1px solid var(--color-border-primary);
}

.network-flow--compact {
  padding: 0;
  background: transparent;
  border: none;
  flex: 1;
}

.network-flow--compact .network-flow__node-icon {
  display: none;
}

.network-flow--compact .network-flow__node {
  gap: 0;
  margin: 0;
}

.network-flow--compact {
  transform: translateY(2px);
}

.network-flow--compact .network-flow__line {
  margin: 0 var(--space-3);
}

.network-flow__node {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: var(--space-2);
  z-index: 2;
  flex-shrink: 0;
}

.network-flow__node-icon {
  width: 48px;
  height: 48px;
  background: var(--color-bg-surface);
  border: 2px solid var(--color-border-primary);
  border-radius: var(--radius-lg);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 24px;
  box-shadow: var(--shadow-sm);
}

.network-flow__node-label {
  font-size: var(--font-size-xs);
  font-weight: var(--font-weight-semibold);
  color: var(--color-text-primary);
}

.network-flow__line {
  flex: 1;
  height: 2px;
  background: var(--color-border-secondary);
  position: relative;
  margin: 0 var(--space-4);
}

.network-flow__packet {
  position: absolute;
  top: 50%;
  width: 12px;
  height: 12px;
  border-radius: 50%;
  transform: translateY(-50%);
  opacity: 0;
  z-index: 3;
}

.network-flow__packet--request {
  left: 0;
  background: var(--color-accent-primary);
  box-shadow: 0 0 10px var(--color-accent-primary);
}

.network-flow__packet--response {
  right: 0;
  background: var(--color-success);
  box-shadow: 0 0 10px var(--color-success);
}

.network-flow.is-sending .network-flow__packet--request {
  animation: movePacketRight 0.8s cubic-bezier(0.4, 0, 0.2, 1) forwards;
}

.network-flow.is-receiving .network-flow__packet--response {
  animation: movePacketLeft 0.8s cubic-bezier(0.4, 0, 0.2, 1) forwards;
}

@keyframes movePacketRight {
  0% { left: 0; opacity: 1; }
  90% { opacity: 1; }
  100% { left: 100%; opacity: 0; }
}

@keyframes movePacketLeft {
  0% { right: 0; opacity: 1; }
  90% { opacity: 1; }
  100% { right: 100%; opacity: 0; }
}

@media (max-width: 600px) {
  .network-flow {
    flex-direction: column;
    gap: var(--space-4);
  }

  .network-flow__line {
    width: 2px;
    height: 60px;
    margin: var(--space-2) 0;
  }

  .network-flow__packet {
    left: 50% !important;
    transform: translateX(-50%);
  }

  .network-flow__packet--request { top: 0; }
  .network-flow__packet--response { bottom: 0; }
}

/* =============================================================================
   SIMULATOR / RESPONSE PANEL
   ============================================================================= */
.simulator {
  border: 1px solid var(--color-border-primary);
  border-radius: var(--radius-xl);
  overflow: hidden;
  background: var(--color-bg-surface);
}

.simulator__toolbar {
  display: flex;
  align-items: center;
  gap: var(--space-3);
  padding: var(--space-3);
  background: var(--color-bg-secondary);
  border-bottom: 1px solid var(--color-border-primary);
}

.simulator__url {
  font-family: var(--font-family-mono);
  font-size: var(--font-size-sm);
  color: var(--color-text-primary);
  flex: 1;
  overflow: hidden;
  text-overflow: ellipsis;
  white-space: nowrap;
}

.simulator__send-area {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: var(--space-3);
}

.response-panel {
  border: 1px solid var(--color-border-primary);
  border-radius: var(--radius-xl);
  overflow: hidden;
  background: var(--color-bg-surface);
  min-height: 200px;
  display: flex;
  flex-direction: column;
}

.response-panel__header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: var(--space-2) var(--space-3);
  background: var(--color-bg-secondary);
  border-bottom: 1px solid var(--color-border-primary);
}

.response-panel__title {
  font-size: var(--font-size-xs);
  font-weight: 600;
  color: var(--color-text-muted);
  letter-spacing: 0.05em;
}

.response-panel__status {
  display: flex;
  align-items: center;
  gap: var(--space-2);
  font-size: var(--font-size-sm);
  font-weight: 600;
}

.response-panel__meta {
  display: flex;
  align-items: center;
  gap: var(--space-4);
  padding: var(--space-2) var(--space-3);
  background: var(--color-bg-tertiary);
  border-bottom: 1px solid var(--color-border-primary);
  font-size: var(--font-size-xs);
  color: var(--color-text-secondary);
  font-family: var(--font-family-mono);
}

.response-panel__body {
  flex: 1;
  padding: var(--space-3);
  position: relative;
  overflow-x: auto;
}

.response-panel__empty {
  position: absolute;
  inset: 0;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  color: var(--color-text-muted);
}

.response-panel__empty-icon {
  font-size: 2rem;
  margin-bottom: var(--space-2);
}

.response-panel__empty-text {
  font-size: var(--font-size-sm);
}

/* =============================================================================
   THEME TOGGLE
   ============================================================================= */
.theme-toggle {
  display: flex;
  align-items: center;
  justify-content: center;
  width: 32px;
  height: 32px;
  border: 1px solid var(--color-border-primary);
  border-radius: var(--radius-md);
  background: var(--color-bg-secondary);
  color: var(--color-text-secondary);
  cursor: pointer;
  transition: all var(--transition-fast);
  font-size: 14px;
}

.theme-toggle:hover {
  background: var(--color-bg-tertiary);
  color: var(--color-text-primary);
  border-color: var(--color-accent-primary);
}

/* =============================================================================
   TABLE
   ============================================================================= */
.data-table {
  width: 100%;
  border-collapse: collapse;
  font-size: var(--font-size-sm);
  display: block;
  overflow-x: auto;
  white-space: nowrap;
}

.data-table th,
.data-table td {
  padding: var(--space-3) var(--space-4);
  text-align: left;
  border-bottom: 1px solid var(--color-border-secondary);
}

.data-table th {
  font-weight: var(--font-weight-semibold);
  color: var(--color-text-muted);
  font-size: var(--font-size-xs);
  text-transform: uppercase;
  letter-spacing: 0.06em;
  background: var(--color-bg-secondary);
}

.data-table td {
  color: var(--color-text-secondary);
  vertical-align: top;
}

.data-table tbody tr:hover {
  background: var(--color-bg-secondary);
}

/* =============================================================================
   INLINE CODE
   ============================================================================= */
code:not(.code-block code) {
  font-family: var(--font-family-mono);
  font-size: 0.875em;
  background: var(--color-code-bg);
  border: 1px solid var(--color-code-border);
  border-radius: var(--radius-sm);
  padding: 1px 5px;
  color: #e85d04;
}

[data-theme="dark"] code:not(.code-block code) {
  color: #ffa657;
}

/* =============================================================================
   EMPTY STATE
   ============================================================================= */
.empty-state {
  text-align: center;
  padding: var(--space-12) var(--space-8);
  color: var(--color-text-muted);
}

.empty-state__icon {
  font-size: 3rem;
  margin-bottom: var(--space-4);
}

.empty-state__title {
  font-size: var(--font-size-lg);
  font-weight: var(--font-weight-semibold);
  color: var(--color-text-secondary);
  margin-bottom: var(--space-2);
}

.empty-state__description {
  font-size: var(--font-size-sm);
  max-width: 320px;
  margin: 0 auto;
}