/* ==========================================================================
   imgbox — Base & Components
   ========================================================================== */

*,
*::before,
*::after {
  box-sizing: border-box;
}

html {
  -webkit-text-size-adjust: 100%;
}

body {
  margin: 0;
  font-family: var(--font-sans);
  font-size: var(--fs-base);
  line-height: var(--lh-normal);
  color: var(--text-primary);
  background: var(--bg-canvas);
  -webkit-font-smoothing: antialiased;
  text-rendering: optimizeLegibility;
  transition: background-color var(--dur-base) var(--ease-out),
    color var(--dur-base) var(--ease-out);
}

h1, h2, h3, h4, p {
  margin: 0;
}

a {
  color: inherit;
  text-decoration: none;
}

button {
  font-family: inherit;
  font-size: inherit;
  cursor: pointer;
  border: none;
  background: none;
  color: inherit;
}

input,
textarea,
select {
  font-family: inherit;
  font-size: inherit;
  color: inherit;
}

img {
  display: block;
  max-width: 100%;
}

:focus-visible {
  outline: 2px solid var(--accent);
  outline-offset: 2px;
  border-radius: var(--radius-sm);
}

.mono {
  font-family: var(--font-mono);
  font-variant-numeric: tabular-nums;
}

/* ---------- 容器 ---------- */
.container {
  width: 100%;
  max-width: var(--maxw);
  margin: 0 auto;
  padding: 0 var(--sp-6);
}

/* ---------- 通用图标（内联 SVG 用） ---------- */
.icon {
  width: 18px;
  height: 18px;
  flex-shrink: 0;
  stroke: currentColor;
  fill: none;
  stroke-width: 1.8;
  stroke-linecap: round;
  stroke-linejoin: round;
}

.icon-sm {
  width: 15px;
  height: 15px;
}

/* ==========================================================================
   按钮
   ========================================================================== */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: var(--sp-2);
  height: 40px;
  padding: 0 var(--sp-4);
  border-radius: var(--radius-md);
  font-size: var(--fs-base);
  font-weight: var(--fw-medium);
  white-space: nowrap;
  transition: background-color var(--dur-fast) var(--ease-out),
    border-color var(--dur-fast) var(--ease-out),
    color var(--dur-fast) var(--ease-out),
    transform var(--dur-fast) var(--ease-out);
}

.btn:active {
  transform: scale(0.98);
}

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

/* 主按钮 */
.btn-primary {
  background: var(--accent);
  color: var(--text-inverse);
}
.btn-primary:hover:not(:disabled) {
  background: var(--accent-hover);
}

/* 次按钮 */
.btn-ghost {
  background: transparent;
  color: var(--text-secondary);
  border: 1px solid var(--border-default);
}
.btn-ghost:hover:not(:disabled) {
  background: var(--bg-hover);
  color: var(--text-primary);
  border-color: var(--border-strong);
}

/* 文本按钮 */
.btn-text {
  height: auto;
  padding: var(--sp-1) var(--sp-2);
  color: var(--text-secondary);
}
.btn-text:hover:not(:disabled) {
  color: var(--accent-text);
  background: var(--accent-soft);
}

/* 危险按钮 */
.btn-danger {
  background: transparent;
  color: var(--danger);
  border: 1px solid var(--border-default);
}
.btn-danger:hover:not(:disabled) {
  background: var(--danger-soft);
  border-color: var(--danger);
}

.btn-sm {
  height: 32px;
  padding: 0 var(--sp-3);
  font-size: var(--fs-sm);
}

.btn-lg {
  height: 46px;
  padding: 0 var(--sp-6);
  font-size: var(--fs-md);
}

.btn-block {
  width: 100%;
}

/* ==========================================================================
   图标按钮（触控目标 ≥ 44px 通过 padding/伪元素保证）
   ========================================================================== */
.icon-btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 38px;
  height: 38px;
  border-radius: var(--radius-md);
  color: var(--text-secondary);
  transition: background-color var(--dur-fast) var(--ease-out),
    color var(--dur-fast) var(--ease-out);
}
.icon-btn:hover {
  background: var(--bg-hover);
  color: var(--text-primary);
}

/* ==========================================================================
   表单
   ========================================================================== */
.field {
  display: flex;
  flex-direction: column;
  gap: var(--sp-2);
}

.field-label {
  font-size: var(--fs-sm);
  font-weight: var(--fw-medium);
  color: var(--text-primary);
}

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

.field-error {
  font-size: var(--fs-xs);
  color: var(--danger);
}

.input,
.textarea,
.select {
  width: 100%;
  min-height: 40px;
  padding: var(--sp-2) var(--sp-3);
  background: var(--bg-sunken);
  border: 1px solid var(--border-default);
  border-radius: var(--radius-md);
  font-size: var(--fs-base);
  color: var(--text-primary);
  transition: border-color var(--dur-fast) var(--ease-out),
    box-shadow var(--dur-fast) var(--ease-out),
    background-color var(--dur-fast) var(--ease-out);
}

.input::placeholder,
.textarea::placeholder {
  color: var(--text-tertiary);
}

.input:hover,
.textarea:hover {
  border-color: var(--border-strong);
}

.input:focus,
.textarea:focus,
.select:focus {
  outline: none;
  border-color: var(--accent);
  box-shadow: 0 0 0 3px var(--accent-soft);
}

.input.is-error,
.textarea.is-error {
  border-color: var(--danger);
}
.input.is-error:focus {
  box-shadow: 0 0 0 3px var(--danger-soft);
}

.textarea {
  min-height: 96px;
  resize: vertical;
  line-height: var(--lh-normal);
}

.select {
  appearance: none;
  background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='16' height='16' viewBox='0 0 24 24' fill='none' stroke='%236b6e76' stroke-width='2' stroke-linecap='round' stroke-linejoin='round'%3E%3Cpath d='m6 9 6 6 6-6'/%3E%3C/svg%3E");
  background-repeat: no-repeat;
  background-position: right 10px center;
  padding-right: 34px;
}

/* ==========================================================================
   卡片 / 面板
   ========================================================================== */
.card {
  background: var(--bg-surface);
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-lg);
  box-shadow: var(--shadow-sm);
}

.card-pad {
  padding: var(--sp-6);
}

/* ==========================================================================
   徽章 / 标签
   ========================================================================== */
.badge {
  display: inline-flex;
  align-items: center;
  gap: var(--sp-1);
  height: 22px;
  padding: 0 var(--sp-2);
  border-radius: var(--radius-pill);
  font-size: var(--fs-xs);
  font-weight: var(--fw-medium);
}

.badge-neutral {
  background: var(--bg-sunken);
  color: var(--text-secondary);
}
.badge-accent {
  background: var(--accent-soft);
  color: var(--accent-text);
}
.badge-success {
  background: var(--success-soft);
  color: var(--success);
}
.badge-danger {
  background: var(--danger-soft);
  color: var(--danger);
}

/* 状态点 */
.dot {
  width: 6px;
  height: 6px;
  border-radius: 50%;
  background: currentColor;
}

/* ==========================================================================
   分段控件（模式切换）
   ========================================================================== */
.segmented {
  display: inline-flex;
  padding: 3px;
  background: var(--bg-sunken);
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-md);
  gap: 2px;
}

.segmented-item {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: var(--sp-2);
  height: 32px;
  padding: 0 var(--sp-3);
  border-radius: var(--radius-sm);
  font-size: var(--fs-sm);
  font-weight: var(--fw-medium);
  color: var(--text-secondary);
  transition: background-color var(--dur-fast) var(--ease-out),
    color var(--dur-fast) var(--ease-out);
}

.segmented-item:hover {
  color: var(--text-primary);
}

.segmented-item.is-active {
  background: var(--bg-surface);
  color: var(--text-primary);
  box-shadow: var(--shadow-sm);
}

/* ==========================================================================
   骨架屏
   ========================================================================== */
.skeleton {
  background: linear-gradient(
    90deg,
    var(--bg-sunken) 25%,
    var(--bg-hover) 37%,
    var(--bg-sunken) 63%
  );
  background-size: 400% 100%;
  animation: shimmer 1.4s ease-in-out infinite;
  border-radius: var(--radius-md);
}

@keyframes shimmer {
  0% { background-position: 100% 0; }
  100% { background-position: 0 0; }
}

/* ==========================================================================
   进入动画
   ========================================================================== */
@keyframes fade-up {
  from {
    opacity: 0;
    transform: translateY(8px);
  }
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

@keyframes fade-in {
  from { opacity: 0; }
  to { opacity: 1; }
}

.animate-in {
  animation: fade-up var(--dur-slow) var(--ease-out) both;
}

.stagger-1 { animation-delay: 40ms; }
.stagger-2 { animation-delay: 90ms; }
.stagger-3 { animation-delay: 140ms; }
.stagger-4 { animation-delay: 190ms; }

/* ==========================================================================
   无障碍：尊重减少动效偏好
   ========================================================================== */
@media (prefers-reduced-motion: reduce) {
  *,
  *::before,
  *::after {
    animation-duration: 0.01ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: 0.01ms !important;
    scroll-behavior: auto !important;
  }
}

/* ==========================================================================
   工具类
   ========================================================================== */
.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;
}

.row {
  display: flex;
  align-items: center;
}
.row-between {
  display: flex;
  align-items: center;
  justify-content: space-between;
}
.gap-2 { gap: var(--sp-2); }
.gap-3 { gap: var(--sp-3); }
.gap-4 { gap: var(--sp-4); }
.muted { color: var(--text-secondary); }
.tiny { font-size: var(--fs-xs); color: var(--text-tertiary); }