/* ===========================================================
   UI Kit - Layer 2: Components
   依赖: ui-kit.css (Design Tokens)
   所有组件只引用 Semantic / Component Tokens，不写裸数值
   =========================================================== */

/* ---- Aliases (convenience shorthand) ---- */
/* 这些变量在本文件中被组件引用，实际值来自 ui-kit.css */
/* 注意：此文件必须在 ui-kit.css 之后加载 */

/* ================================================
   Atoms: Button (.btn)
   ================================================ */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: var(--pr-space-2);
  height: var(--btn-height-md);
  padding: 0 var(--btn-padding-x-md);
  border: 1px solid transparent;
  border-radius: var(--btn-radius);
  font-size: var(--btn-font-size);
  font-weight: var(--btn-font-weight);
  font-family: inherit;
  line-height: var(--pr-leading-tight);
  cursor: pointer;
  user-select: none;
  white-space: nowrap;
  transition: all var(--pr-duration-fast) var(--pr-ease-out);
  text-decoration: none;
}

.btn:focus-visible {
  outline: none;
  box-shadow: var(--input-focus-ring);
}

.btn:disabled,
.btn[aria-disabled="true"] {
  opacity: var(--btn-disabled-opacity);
  cursor: not-allowed;
  pointer-events: none;
}

/* -- Primary -- */
.btn-primary {
  background: var(--btn-action-bg);
  color: var(--btn-action-text);
  border-color: var(--btn-action-bg);
}
.btn-primary:hover:not(:disabled) {
  background: var(--btn-action-hover);
  border-color: var(--btn-action-hover);
}
.btn-primary:active:not(:disabled) {
  background: var(--color-action-hover);
}

/* -- Secondary -- */
.btn-secondary {
  background: var(--btn-secondary-bg);
  color: var(--btn-secondary-text);
  border-color: var(--btn-secondary-border);
}
.btn-secondary:hover:not(:disabled) {
  background: var(--btn-secondary-hover);
}

/* -- Ghost -- */
.btn-ghost {
  background: transparent;
  color: var(--btn-ghost-text);
}
.btn-ghost:hover:not(:disabled) {
  background: var(--btn-ghost-hover);
}

/* -- Danger -- */
.btn-danger {
  background: var(--btn-danger-bg);
  color: var(--btn-danger-text);
}
.btn-danger:hover:not(:disabled) {
  background: var(--btn-danger-hover);
}

/* -- Sizes -- */
.btn-sm { height: var(--btn-height-sm); padding: 0 var(--btn-padding-x-sm); font-size: var(--pr-text-xs); }
.btn-lg { height: var(--btn-height-lg); padding: 0 var(--btn-padding-x-lg); font-size: var(--pr-text-base); }

/* -- Icon-only button -- */
.btn-icon {
  width: var(--toolbar-btn-size);
  height: var(--toolbar-btn-size);
  padding: 0;
  background: transparent;
  color: var(--text-primary);
  border: none;
  border-radius: var(--toolbar-btn-radius);
  display: inline-flex;
  align-items: center;
  justify-content: center;
  cursor: pointer;
  transition: background var(--pr-duration-fast) var(--pr-ease-out);
}
.btn-icon:hover { background: var(--bg-surface-hover); }
.btn-icon:focus-visible { box-shadow: var(--input-focus-ring); outline: none; }
.btn-icon:disabled { opacity: var(--btn-disabled-opacity); cursor: not-allowed; }
.btn-icon svg { width: 18px; height: 18px; flex-shrink: 0; }

.btn-icon-sm { width: 28px; height: 28px; }
.btn-icon-sm svg { width: 14px; height: 14px; }
.btn-icon-lg { width: 44px; height: 44px; }
.btn-icon-lg svg { width: 24px; height: 24px; }

/* ================================================
   Atoms: Badge
   ================================================ */
.badge {
  display: inline-flex;
  align-items: center;
  gap: var(--pr-space-1);
  padding: var(--badge-padding);
  border-radius: var(--badge-radius);
  font-size: var(--badge-font-size);
  font-weight: var(--pr-weight-medium);
  line-height: var(--pr-leading-tight);
  white-space: nowrap;
}

.badge-success { background: var(--success-bg); color: var(--success-text); }
.badge-error   { background: var(--error-bg); color: var(--error-text); }
.badge-warning { background: var(--warning-bg); color: var(--warning-text); }
.badge-info    { background: var(--color-action-subtle); color: var(--color-action); }

/* ================================================
   Atoms: Tag
   ================================================ */
.tag {
  display: inline-flex;
  align-items: center;
  gap: var(--pr-space-1);
  padding: var(--tag-padding);
  border: 1px solid var(--border-default);
  border-radius: var(--tag-radius);
  font-size: var(--tag-font-size);
  font-weight: var(--pr-weight-medium);
  color: var(--text-secondary);
  background: var(--bg-surface);
  white-space: nowrap;
  cursor: default;
  transition: all var(--pr-duration-fast) var(--pr-ease-out);
}

.tag-active {
  background: var(--color-action-subtle);
  color: var(--color-action);
  border-color: var(--color-action);
}

.tag-clickable {
  cursor: pointer;
}
.tag-clickable:hover {
  background: var(--bg-surface-hover);
  border-color: var(--border-strong);
}

.tag-row {
  display: flex;
  gap: var(--pr-space-1);
  padding: var(--pr-space-2) var(--pr-space-3);
  border-bottom: 1px solid var(--border-weak);
  overflow-x: auto;
  scrollbar-width: none;
}
.tag-row::-webkit-scrollbar { display: none; }

/* ================================================
   Atoms: Divider
   ================================================ */
.divider-h {
  width: 100%;
  height: 1px;
  background: var(--border-default);
  border: none;
  flex-shrink: 0;
}

.divider-v {
  width: 1px;
  align-self: stretch;
  background: var(--border-default);
  border: none;
  flex-shrink: 0;
}

/* ================================================
   Atoms: Spinner
   ================================================ */
.spinner {
  display: inline-block;
  width: 20px;
  height: 20px;
  border: 2px solid var(--border-default);
  border-top-color: var(--color-action);
  border-radius: 50%;
  animation: spin 0.6s linear infinite;
}

.spinner-sm { width: 14px; height: 14px; border-width: 2px; }
.spinner-lg { width: 32px; height: 32px; border-width: 3px; }

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

/* ================================================
   Molecules: Card
   ================================================ */
.card {
  background: var(--card-bg);
  border: 1px solid var(--card-border);
  border-radius: var(--card-radius);
  padding: var(--card-padding);
  box-shadow: var(--card-shadow);
  transition: box-shadow var(--pr-duration-fast) var(--pr-ease-out);
}

.card-hoverable:hover {
  box-shadow: var(--card-shadow-hover);
}

.card-clickable {
  cursor: pointer;
}
.card-clickable:hover {
  box-shadow: var(--card-shadow-hover);
}

/* ================================================
   Molecules: Toolbar
   ================================================ */
.toolbar {
  display: flex;
  align-items: center;
  height: var(--toolbar-height);
  padding: 0 var(--pr-space-3);
  background: var(--toolbar-bg);
  border-bottom: 1px solid var(--toolbar-border);
  gap: var(--toolbar-gap);
  flex-shrink: 0;
}

.toolbar-left    { display: flex; align-items: center; gap: var(--toolbar-gap); }
.toolbar-center  { display: flex; align-items: center; justify-content: center; flex: 1; gap: var(--toolbar-gap); }
.toolbar-right   { display: flex; align-items: center; gap: var(--toolbar-gap); margin-left: auto; }

.toolbar-title {
  font-size: var(--pr-text-sm);
  font-weight: var(--pr-weight-semibold);
  color: var(--text-primary);
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
}

.toolbar-group {
  display: flex;
  align-items: center;
  gap: var(--pr-space-1);
}

/* ================================================
   Molecules: Input
   ================================================ */
.input {
  width: 100%;
  height: var(--input-height);
  padding: 0 var(--input-padding-x);
  background: var(--input-bg);
  border: 1px solid var(--input-border);
  border-radius: var(--input-radius);
  font-size: var(--pr-text-sm);
  font-family: inherit;
  color: var(--text-primary);
  transition: border-color var(--pr-duration-fast) var(--pr-ease-out),
              box-shadow var(--pr-duration-fast) var(--pr-ease-out);
}

.input::placeholder { color: var(--input-placeholder); }
.input:focus { outline: none; border-color: var(--border-focus); box-shadow: var(--input-focus-ring); }
.input:disabled { opacity: 0.5; cursor: not-allowed; background: var(--bg-surface-raised); }
.input-error { border-color: var(--border-error); }
.input-error:focus { box-shadow: 0 0 0 3px rgba(239, 68, 68, 0.15); }

/* ================================================
   Molecules: Form Group
   ================================================ */
.form-group {
  display: flex;
  flex-direction: column;
  gap: var(--pr-space-1-5);
}

.form-label {
  font-size: var(--pr-text-sm);
  font-weight: var(--pr-weight-medium);
  color: var(--text-primary);
}

.form-hint {
  font-size: var(--pr-text-xs);
  color: var(--text-tertiary);
}

.form-error {
  font-size: var(--pr-text-xs);
  color: var(--error);
}

/* ================================================
   Molecules: Empty State
   ================================================ */
.empty-state {
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  gap: var(--pr-space-3);
  padding: var(--pr-space-8);
  color: var(--text-tertiary);
  text-align: center;
}

.empty-state-icon {
  width: 48px;
  height: 48px;
  opacity: 0.4;
}

.empty-state-text {
  font-size: var(--pr-text-sm);
  line-height: var(--pr-leading-relaxed);
}

/* ================================================
   Organisms: Toast
   ================================================ */
.toast-container {
  position: fixed;
  bottom: var(--pr-space-6);
  left: 50%;
  transform: translateX(-50%);
  z-index: var(--pr-z-toast);
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: var(--pr-space-2);
  pointer-events: none;
}
.toast-container > * { pointer-events: auto; }

.toast {
  display: none;
  align-items: center;
  gap: var(--pr-space-2);
  padding: var(--toast-padding);
  border-radius: var(--toast-radius);
  box-shadow: var(--toast-shadow);
  font-size: var(--pr-text-sm);
  line-height: var(--pr-leading-tight);
  color: var(--pr-white);
  background: var(--pr-gray-900);
}

.toast.show {
  display: flex;
  animation: toast-in var(--pr-duration-normal) var(--pr-ease-out);
}

.toast-success { background: var(--pr-gray-900); }
.toast-error   { background: var(--pr-red-600); }
.toast-warning { background: var(--pr-yellow-600); color: var(--pr-gray-900); }

@keyframes toast-in {
  from { opacity: 0; transform: translateY(8px) scale(0.96); }
  to   { opacity: 1; transform: translateY(0) scale(1); }
}

/* ================================================
   Organisms: Modal / Lightbox
   ================================================ */
.modal-backdrop {
  position: fixed;
  inset: 0;
  background: var(--modal-backdrop);
  z-index: var(--pr-z-modal);
  display: flex;
  align-items: center;
  justify-content: center;
  animation: fade-in var(--pr-duration-normal) var(--pr-ease-out);
}

.modal {
  background: var(--bg-surface);
  border-radius: var(--modal-radius);
  box-shadow: var(--modal-shadow);
  padding: var(--modal-padding);
  max-width: 90vw;
  max-height: 90vh;
  overflow: auto;
  animation: scale-in var(--pr-duration-normal) var(--pr-ease-out);
}

@keyframes fade-in  { from { opacity: 0; } to { opacity: 1; } }
@keyframes scale-in { from { opacity: 0; transform: scale(0.95); } to { opacity: 1; transform: scale(1); } }

/* ================================================
   Organisms: Phone Frame (landing page mockup)
   ================================================ */
.phone-frame {
  width: 100%;
  max-width: 375px;
  aspect-ratio: 375 / 667;
  border-radius: var(--pr-radius-lg);
  overflow: hidden;
  box-shadow: var(--shadow-lg);
  background: var(--pr-white);
  border: 1px solid var(--border-default);
  position: relative;
}

.phone-frame-topbar {
  position: sticky;
  top: 0;
  z-index: 2;
  display: block;
  width: 100%;
  height: auto;
}

.phone-frame-body {
  position: absolute;
  top: 0; left: 0; right: 0; bottom: 0;
  overflow-y: auto;
  overflow-x: hidden;
  scrollbar-width: none;
}

.phone-frame-body::-webkit-scrollbar { display: none; }

.phone-frame-body img {
  display: block;
  width: 100%;
  height: auto;
}

/* ================================================
   Organisms: TimeLine (landing page history)
   ================================================ */
.timeline {
  display: flex;
  gap: var(--pr-space-4);
  padding: var(--pr-space-3);
  overflow-x: auto;
  overflow-y: hidden;
  align-items: flex-start;
  scrollbar-width: none;
}
.timeline::-webkit-scrollbar { display: none; }

.timeline-node {
  flex: 0 0 140px;
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: var(--pr-space-1);
  position: relative;
}

.timeline-node::after {
  content: '›››';
  position: absolute;
  top: 34px;
  left: calc(100% + 2px);
  width: var(--pr-space-4);
  text-align: center;
  font-size: var(--pr-text-base);
  font-weight: var(--pr-weight-bold);
  color: var(--color-action);
  line-height: 1;
  letter-spacing: -2px;
}

.timeline-node:last-child::after { display: none; }

.timeline-thumb {
  width: var(--landingpage-node-thumb-size);
  height: var(--landingpage-node-thumb-size);
  border-radius: var(--pr-radius-md);
  object-fit: cover;
  border: 2px solid var(--border-default);
  cursor: pointer;
  transition: border-color var(--pr-duration-fast),
              transform var(--pr-duration-fast);
  flex-shrink: 0;
}

.timeline-thumb:hover {
  border-color: var(--color-action);
  transform: scale(1.05);
}

.timeline-summary {
  font-size: var(--pr-text-xs);
  color: var(--text-secondary);
  text-align: center;
  max-width: 130px;
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
}

.timeline-summary-tip {
  position: relative;
}

.timeline-summary-tip[data-tip]:hover::after {
  content: attr(data-tip);
  position: absolute;
  bottom: calc(100% + var(--pr-space-1));
  left: 50%;
  transform: translateX(-50%);
  background: var(--pr-gray-600);
  color: var(--text-inverse);
  font-size: var(--pr-text-xs);
  padding: var(--pr-space-1) var(--pr-space-2);
  border-radius: var(--pr-radius-sm);
  white-space: normal;
  max-width: 200px;
  word-break: break-all;
  z-index: var(--pr-z-tooltip);
  pointer-events: none;
}

.timeline-action {
  height: var(--btn-height-sm);
  display: flex;
  align-items: center;
  justify-content: center;
  width: 100%;
}

/* Accent variant (landingpage indigo) */
.timeline-accent .timeline-node::after {
  color: var(--accent);
}

.timeline-accent .timeline-thumb:hover {
  border-color: var(--accent);
}

.timeline-accent .timeline-thumb-status.editing .spinner {
  border-top-color: var(--accent);
}

.timeline-thumb-status {
  width: var(--landingpage-node-thumb-size);
  height: var(--landingpage-node-thumb-size);
  border-radius: var(--pr-radius-md);
  border: 2px dashed var(--border-weak);
  display: flex;
  align-items: center;
  justify-content: center;
  flex-shrink: 0;
  background: var(--bg-surface-hover);
  position: relative;
  overflow: hidden;
}

.timeline-thumb-status.editing {
  background: var(--landingpage-editing-overlay);
  border: 2px solid var(--border-weak);
}

.timeline-thumb-status.failed {
  border: 2px solid var(--border-default);
}

.timeline-status-icon {
  font-size: var(--pr-text-2xl);
  color: var(--text-tertiary);
  line-height: 1;
}

/* ================================================
   Utility Classes
   ================================================ */
.sr-only {
  position: absolute; width: 1px; height: 1px;
  padding: 0; margin: -1px; overflow: hidden;
  clip: rect(0,0,0,0); white-space: nowrap; border: 0;
}

.truncate {
  white-space: nowrap; overflow: hidden; text-overflow: ellipsis;
}

.flex-center {
  display: flex; align-items: center; justify-content: center;
}

.flex-between {
  display: flex; align-items: center; justify-content: space-between;
}

.gap-1 { gap: var(--pr-space-1); }
.gap-2 { gap: var(--pr-space-2); }
.gap-3 { gap: var(--pr-space-3); }
.gap-4 { gap: var(--pr-space-4); }