/**
 * AKSRT Buttons — 1:1 Zibll Alignment
 *
 * 对齐 zibll .but 系统：
 * - 正常字重 (normal)
 * - 4px 圆角
 * - 灰色默认背景
 * - opacity hover
 */

.btn,
.btn-primary,
.btn-outline,
.btn-ghost,
.btn-danger {
  --btn-h: 34px;
  --btn-px: 12px;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 6px;
  height: var(--btn-h);
  padding: 0 var(--btn-px);
  font-size: var(--text-sm);
  font-weight: normal;
  line-height: 1.44;
  border: 1px solid transparent;
  border-radius: var(--radius-btn);
  cursor: pointer;
  white-space: nowrap;
  user-select: none;
  text-decoration: none;
  transition: opacity var(--dur-fast) var(--ease),
              background var(--dur-fast) var(--ease),
              border-color var(--dur-fast) var(--ease),
              color var(--dur-fast) var(--ease);
}

/* 尺寸变体 */
.btn-sm { --btn-h: 28px; --btn-px: 8px; font-size: var(--text-xs); }
.btn-lg { --btn-h: 44px; --btn-px: 18px; font-size: var(--text-base); }

/* === Default (gray background, like zibll .but default) === */
.btn {
  background: rgba(136, 136, 136, 0.1);
  color: #888;
}

.btn:hover {
  opacity: 0.8;
}

/* === Primary === */
.btn-primary {
  background: var(--color-primary);
  color: var(--color-on-primary);
  border-color: var(--color-primary);
}

.btn-primary:hover {
  opacity: 0.85;
  color: var(--color-on-primary);
}

.btn-primary:active {
  opacity: 1;
  box-shadow: inset 0 2px 4px rgba(0, 0, 0, 0.15);
}

/* === Outline === */
.btn-outline {
  background: transparent;
  color: var(--color-ink-2);
  border-color: var(--color-line);
}

.btn-outline:hover {
  border-color: var(--color-primary);
  color: var(--color-primary);
  opacity: 1;
}

/* === Ghost === */
.btn-ghost {
  background: transparent;
  color: var(--color-ink-2);
  border-color: transparent;
}

.btn-ghost:hover {
  background: rgba(136, 136, 136, 0.1);
  opacity: 1;
}

/* === Danger === */
.btn-danger {
  background: var(--color-error);
  color: #fff;
  border-color: var(--color-error);
}

.btn-danger:hover {
  opacity: 0.85;
  color: #fff;
}

/* === Disabled === */
.btn:disabled,
.btn-primary:disabled,
.btn-outline:disabled,
.btn-ghost:disabled,
.btn-danger:disabled {
  opacity: 0.5;
  cursor: not-allowed;
  pointer-events: none;
}

/* === Icon button === */
.btn-icon {
  width: var(--btn-h);
  padding: 0;
  justify-content: center;
}

.btn-icon.btn-sm { width: 28px; }
.btn-icon.btn-lg { width: 44px; }

/* === Full width === */
.btn-block {
  width: 100%;
}