/* =========================================================================
 * components.css — 通用组件
 * 按钮 / 输入 / 卡片 / 手风琴 / Tab / Modal / Toast / Tag / Chip
 * ========================================================================= */

/* ========== Button ========== */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: var(--space-2);
  height: 40px;
  padding: 0 var(--space-5);
  font-family: var(--font-sans);
  font-size: var(--fs-sm);
  font-weight: var(--fw-semibold);
  letter-spacing: 0.04em;
  border: 1px solid transparent;
  border-radius: var(--radius-md);
  cursor: pointer;
  transition: all var(--dur-fast) var(--ease-out);
  user-select: none;
  white-space: nowrap;
}
.btn:active { transform: scale(0.97); }
.btn:disabled, .btn[aria-disabled="true"] {
  opacity: 0.5;
  cursor: not-allowed;
  pointer-events: none;
}
.btn__icon { width: 16px; height: 16px; flex-shrink: 0; }

.btn--primary {
  background: var(--color-ink);
  color: var(--color-bg);
  border-color: var(--color-ink);
}
.btn--primary:hover { background: #1f1f1f; border-color: #1f1f1f; }

.btn--secondary {
  background: var(--color-bg);
  color: var(--color-ink);
  border-color: var(--color-line);
}
.btn--secondary:hover { background: var(--color-bg-alt); }

.btn--ghost {
  background: transparent;
  color: var(--color-ink);
}
.btn--ghost:hover { background: var(--color-bg-alt); }

.btn--danger {
  background: var(--color-danger);
  color: #fff;
  border-color: var(--color-danger);
}
.btn--danger:hover { background: #8a0023; border-color: #8a0023; }

.btn--sm { height: 32px; padding: 0 var(--space-3); font-size: var(--fs-xs); }
.btn--sm .btn__icon { width: 14px; height: 14px; }
.btn--lg { height: 48px; padding: 0 var(--space-8); font-size: var(--fs-body); }
.btn--lg .btn__icon { width: 18px; height: 18px; }
.btn--block { width: 100%; }

/* 图标按钮（圆形） */
.icon-btn {
  display: inline-flex;
  align-items: center; justify-content: center;
  width: 32px; height: 32px;
  border-radius: var(--radius-md);
  color: var(--color-ink-soft);
  transition: background var(--dur-fast), color var(--dur-fast);
}
.icon-btn:hover { background: var(--color-bg-alt); color: var(--color-ink); }
.icon-btn.is-danger:hover { background: var(--color-danger-soft); color: var(--color-danger); }
.icon-btn svg { width: 16px; height: 16px; }
.icon-btn--lg { width: 40px; height: 40px; }
.icon-btn--lg svg { width: 18px; height: 18px; }

/* ========== Form Field ========== */
.field {
  display: flex;
  flex-direction: column;
  gap: var(--space-2);
}
.field__label {
  font-size: var(--fs-xs);
  font-weight: var(--fw-semibold);
  text-transform: uppercase;
  letter-spacing: 0.12em;
  color: var(--color-ink-soft);
}
.field__hint {
  font-size: var(--fs-xs);
  color: var(--color-ink-muted);
  line-height: var(--lh-snug);
}
.field__required::after {
  content: ' *';
  color: var(--color-danger);
}

.input, .textarea, .select {
  width: 100%;
  padding: 0 var(--space-3);
  height: 40px;
  background: var(--color-bg);
  border: 1px solid var(--color-line-medium);
  border-radius: var(--radius-md);
  color: var(--color-ink);
  font-size: var(--fs-body);
  font-family: var(--font-sans);
  transition: border-color var(--dur-fast), box-shadow var(--dur-fast);
  outline: none;
}
.input:focus, .textarea:focus, .select:focus {
  border-color: var(--color-ink);
  box-shadow: var(--shadow-focus);
}
.input::placeholder, .textarea::placeholder { color: var(--color-ink-faint); }

.textarea {
  min-height: 96px;
  height: auto;
  padding: var(--space-3);
  line-height: var(--lh-normal);
  resize: vertical;
  font-family: var(--font-sans);
}

.select {
  appearance: none;
  background-image: url("data:image/svg+xml;utf8,<svg xmlns='http://www.w3.org/2000/svg' width='12' height='12' viewBox='0 0 24 24' fill='none' stroke='%230a0a0a' stroke-width='2' stroke-linecap='round' stroke-linejoin='round'><polyline points='6 9 12 15 18 9'/></svg>");
  background-repeat: no-repeat;
  background-position: right 12px center;
  padding-right: var(--space-8);
}

.input-group {
  display: flex;
  gap: var(--space-2);
  align-items: center;
}
.input-group .input { flex: 1; }

/* ========== Card ========== */
.card {
  background: var(--color-surface);
  border: 1px solid var(--color-line-soft);
  border-radius: var(--radius-lg);
  padding: var(--space-6);
}
.card--elevated {
  background: var(--color-surface-elevated);
  box-shadow: var(--shadow-sm);
}
.card--bordered { border-color: var(--color-line); }
.card--padded-lg { padding: var(--space-8); }
.card--no-pad { padding: 0; }

.card-header {
  display: flex;
  align-items: flex-start;
  justify-content: space-between;
  gap: var(--space-4);
  margin-bottom: var(--space-4);
}
.card-header__title {
  font-family: var(--font-serif);
  font-size: var(--fs-h3);
  font-weight: var(--fw-bold);
}
.card-header__sub {
  font-size: var(--fs-sm);
  color: var(--color-ink-muted);
  margin-top: var(--space-1);
}

/* ========== Chip / Tag ========== */
.chip {
  display: inline-flex;
  align-items: center;
  gap: var(--space-1);
  height: 28px;
  padding: 0 var(--space-3);
  background: var(--color-bg);
  border: 1px solid var(--color-line-medium);
  border-radius: var(--radius-pill);
  font-size: var(--fs-xs);
  font-weight: var(--fw-medium);
  color: var(--color-ink-soft);
  cursor: pointer;
  transition: all var(--dur-fast) var(--ease-out);
  user-select: none;
}
.chip:hover { border-color: var(--color-ink); color: var(--color-ink); }
.chip.is-selected {
  background: var(--color-ink);
  color: var(--color-bg);
  border-color: var(--color-ink);
}
.chip__remove {
  display: inline-flex;
  width: 14px; height: 14px;
  margin-left: 2px;
  align-items: center; justify-content: center;
  border-radius: 50%;
}
.chip__remove:hover { background: rgba(255,255,255,0.2); }

.tag {
  display: inline-flex;
  align-items: center;
  gap: var(--space-1);
  padding: 2px 8px;
  background: var(--color-bg-alt);
  border: 1px solid var(--color-line-soft);
  border-radius: var(--radius-sm);
  font-size: var(--fs-xs);
  color: var(--color-ink-soft);
}
.tag--group { background: var(--color-ink); color: var(--color-bg); border-color: var(--color-ink); }
.tag--danger { background: var(--color-danger-soft); color: var(--color-danger); border-color: transparent; }
.tag--success { background: var(--color-success-soft); color: var(--color-success); border-color: transparent; }
.tag--warn { background: var(--color-warn-soft); color: var(--color-warn); border-color: transparent; }

/* ========== Accordion（手风琴） ========== */
.accordion-item {
  border-bottom: var(--border-thin);
}
.accordion-item:first-child { border-top: var(--border-thin); }
.accordion-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: var(--space-3);
  width: 100%;
  padding: var(--space-4) 0;
  cursor: pointer;
  user-select: none;
  background: transparent;
  border: 0;
  text-align: left;
}
.accordion-header:hover .accordion-title { color: var(--color-ink); }
.accordion-meta {
  display: flex; align-items: center; gap: var(--space-3);
}
.accordion-num {
  font-family: var(--font-mono);
  font-size: var(--fs-caption);
  color: var(--color-ink-muted);
  text-transform: uppercase;
  letter-spacing: 0.12em;
}
.accordion-title {
  font-family: var(--font-sans);
  font-size: var(--fs-body);
  font-weight: var(--fw-semibold);
  color: var(--color-ink-soft);
  transition: color var(--dur-fast);
}
.accordion-chevron {
  width: 18px; height: 18px;
  color: var(--color-ink-muted);
  transition: transform var(--dur-base) var(--ease-out);
}
.accordion-item.is-open > .accordion-header .accordion-chevron {
  transform: rotate(180deg);
  color: var(--color-ink);
}
.accordion-body {
  display: grid;
  grid-template-rows: 0fr;
  transition: grid-template-rows var(--dur-base) var(--ease-out);
  overflow: hidden;
}
.accordion-item.is-open > .accordion-body {
  grid-template-rows: 1fr;
}
.accordion-body > .accordion-inner {
  min-height: 0;
  padding-bottom: var(--space-4);
  transition: padding-bottom var(--dur-base) var(--ease-out);
}
.accordion-item:not(.is-open) > .accordion-body > .accordion-inner {
  padding-bottom: 0;
}

/* ========== Tabs ========== */
.tabs {
  display: flex;
  gap: 0;
  border-bottom: var(--border-strong);
  margin-bottom: var(--space-6);
}
.tabs__item {
  position: relative;
  padding: var(--space-3) var(--space-4);
  font-size: var(--fs-sm);
  font-weight: var(--fw-medium);
  color: var(--color-ink-muted);
  cursor: pointer;
  background: transparent;
  border: 0;
  transition: color var(--dur-fast);
}
.tabs__item:hover { color: var(--color-ink); }
.tabs__item.is-active { color: var(--color-ink); font-weight: var(--fw-semibold); }
.tabs__item.is-active::after {
  content: '';
  position: absolute;
  left: 0; right: 0; bottom: -1px;
  height: 2px;
  background: var(--color-ink);
}

/* ========== Modal ========== */
.modal {
  position: fixed;
  inset: 0;
  z-index: var(--z-modal);
  display: flex;
  align-items: center;
  justify-content: center;
  padding: var(--space-4);
  background: rgba(0, 0, 0, 0.5);
  opacity: 0;
  pointer-events: none;
  transition: opacity var(--dur-base) var(--ease-out);
}
.modal.is-open {
  opacity: 1;
  pointer-events: auto;
}
.modal-card {
  background: var(--color-bg);
  border-radius: var(--radius-lg);
  box-shadow: var(--shadow-lg);
  max-width: 640px;
  width: 100%;
  max-height: calc(100vh - var(--space-8));
  max-height: calc(100dvh - var(--space-8));
  display: flex;
  flex-direction: column;
  overflow: hidden;
  transform: translateY(16px);
  transition: transform var(--dur-base) var(--ease-out);
}
.modal.is-open .modal-card { transform: translateY(0); }
.modal-card--wide { max-width: 880px; }
.modal-card--narrow { max-width: 480px; }

.modal-header {
  display: flex; align-items: center; justify-content: space-between;
  padding: var(--space-5) var(--space-6);
  border-bottom: var(--border-thin);
}
.modal-title {
  font-family: var(--font-serif);
  font-size: var(--fs-h3);
  font-weight: var(--fw-bold);
}
.modal-body {
  padding: var(--space-6);
  overflow-y: auto;
  flex: 1;
}
.modal-footer {
  display: flex; justify-content: flex-end; gap: var(--space-3);
  padding: var(--space-4) var(--space-6);
  border-top: var(--border-thin);
}

/* ========== Toast ========== */
.toast-container {
  position: fixed;
  left: 50%; bottom: var(--space-8);
  transform: translateX(-50%);
  z-index: var(--z-toast);
  display: flex;
  flex-direction: column;
  gap: var(--space-2);
  align-items: center;
  pointer-events: none;
  padding-bottom: var(--safe-bottom);
}
.toast {
  display: flex;
  align-items: center;
  gap: var(--space-3);
  min-width: 280px;
  max-width: 480px;
  padding: var(--space-3) var(--space-4);
  background: var(--color-ink);
  color: var(--color-bg);
  border-radius: var(--radius-md);
  box-shadow: var(--shadow-md);
  font-size: var(--fs-sm);
  font-weight: var(--fw-medium);
  pointer-events: auto;
  animation: toast-in var(--dur-base) var(--ease-out);
}
.toast.is-leaving { animation: toast-out var(--dur-base) var(--ease-out) forwards; }
.toast__icon { width: 18px; height: 18px; flex-shrink: 0; }
.toast__close {
  margin-left: auto;
  width: 20px; height: 20px;
  display: inline-flex; align-items: center; justify-content: center;
  border-radius: var(--radius-sm);
  color: rgba(255,255,255,0.7);
}
.toast__close:hover { background: rgba(255,255,255,0.1); color: #fff; }

.toast--success { background: var(--color-success); }
.toast--warn { background: var(--color-warn); }
.toast--error { background: var(--color-danger); }
.toast--info { background: var(--color-ink); }

@keyframes toast-in {
  from { opacity: 0; transform: translateY(16px); }
  to { opacity: 1; transform: translateY(0); }
}
@keyframes toast-out {
  to { opacity: 0; transform: translateY(8px); }
}

/* ========== Loading Overlay ========== */
.loading-overlay {
  position: fixed;
  inset: 0;
  z-index: var(--z-overlay);
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  gap: var(--space-4);
  background: rgba(255, 255, 255, 0.92);
  backdrop-filter: blur(4px);
  -webkit-backdrop-filter: blur(4px);
}
.spinner {
  width: 32px; height: 32px;
  border: 2px solid var(--color-line-soft);
  border-top-color: var(--color-ink);
  border-radius: 50%;
  animation: spin 0.8s linear infinite;
}
.loading-overlay__text {
  font-size: var(--fs-sm);
  color: var(--color-ink-soft);
  font-weight: var(--fw-medium);
}
@keyframes spin { to { transform: rotate(360deg); } }

/* ========== Spinner inline ========== */
.spinner--inline { display: inline-block; vertical-align: middle; width: 16px; height: 16px; }

/* ========== Empty State ========== */
.empty {
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  gap: var(--space-3);
  padding: var(--space-16) var(--space-6);
  text-align: center;
  color: var(--color-ink-muted);
}
.empty__icon {
  width: 48px; height: 48px;
  color: var(--color-ink-faint);
}
.empty__title {
  font-family: var(--font-serif);
  font-size: var(--fs-h2);
  color: var(--color-ink-soft);
}