/* ========================================
   基础样式
   ======================================== */

*, *::before, *::after {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}

html {
  font-size: var(--font-size-base);
  -webkit-text-size-adjust: 100%;
  -webkit-tap-highlight-color: transparent;
}

body {
  font-family: var(--font-family);
  background-color: var(--bg-app);
  color: var(--text-primary);
  line-height: 1.6;
  min-height: 100vh;
  transition: background-color var(--transition-normal), color var(--transition-normal);
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

/* --- 滚动条 --- */
::-webkit-scrollbar {
  width: 8px;
  height: 8px;
}

::-webkit-scrollbar-track {
  background: var(--scrollbar-track);
}

::-webkit-scrollbar-thumb {
  background: var(--scrollbar-thumb);
  border-radius: var(--radius-full);
}

::-webkit-scrollbar-thumb:hover {
  background: var(--text-tertiary);
}

/* --- 链接 --- */
a {
  color: var(--brand-primary);
  text-decoration: none;
  transition: color var(--transition-fast);
}

a:hover {
  color: var(--brand-primary-hover);
}

/* --- 输入框基础 --- */
input, select, textarea {
  font-family: inherit;
  font-size: inherit;
  color: var(--text-primary);
  background-color: var(--bg-input);
  border: 2px solid var(--input-border);
  border-radius: var(--radius-md);
  padding: 10px 14px;
  width: 100%;
  transition: border-color var(--transition-fast), box-shadow var(--transition-fast);
  outline: none;
}

input:focus, select:focus, textarea:focus {
  border-color: var(--input-focus-border);
  box-shadow: 0 0 0 3px rgba(37, 99, 235, 0.15);
}

input::placeholder {
  color: var(--input-placeholder);
}

/* 隐藏数字输入框的旋钮 */
input[type="number"]::-webkit-inner-spin-button,
input[type="number"]::-webkit-outer-spin-button {
  -webkit-appearance: none;
  margin: 0;
}

input[type="number"] {
  -moz-appearance: textfield;
}

/* --- 按钮 --- */
button {
  font-family: inherit;
  font-size: inherit;
  cursor: pointer;
  border: none;
  outline: none;
  transition: all var(--transition-fast);
}

.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: var(--space-sm);
  padding: 10px 20px;
  border-radius: var(--radius-md);
  font-weight: 600;
  font-size: var(--font-size-sm);
  transition: all var(--transition-fast);
  white-space: nowrap;
}

.btn-primary {
  background: var(--brand-gradient);
  color: var(--text-inverse);
  box-shadow: var(--shadow-sm);
}

.btn-primary:hover {
  transform: translateY(-1px);
  box-shadow: var(--shadow-md);
}

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

.btn-secondary {
  background-color: var(--bg-surface-hover);
  color: var(--text-primary);
  border: 2px solid var(--border-color);
}

.btn-secondary:hover {
  border-color: var(--brand-primary);
  color: var(--brand-primary);
}

.btn-ghost {
  background: transparent;
  color: var(--text-secondary);
  padding: 8px 12px;
}

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

/* --- 工具类 --- */
.text-center { text-align: center; }
.text-right { text-align: right; }
.font-bold { font-weight: 700; }
.font-mono { font-family: var(--font-mono); }
.hidden { display: none !important; }
.flex { display: flex; }
.flex-col { flex-direction: column; }
.items-center { align-items: center; }
.justify-center { justify-content: center; }
.justify-between { justify-content: space-between; }
.gap-sm { gap: var(--space-sm); }
.gap-md { gap: var(--space-md); }
.gap-lg { gap: var(--space-lg); }
.flex-1 { flex: 1; }
.flex-wrap { flex-wrap: wrap; }

/* --- 动画 --- */
@keyframes fadeIn {
  from { opacity: 0; }
  to { opacity: 1; }
}

@keyframes slideUp {
  from { opacity: 0; transform: translateY(20px); }
  to { opacity: 1; transform: translateY(0); }
}

@keyframes slideInLeft {
  from { opacity: 0; transform: translateX(-20px); }
  to { opacity: 1; transform: translateX(0); }
}

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

@keyframes pulse {
  0%, 100% { opacity: 1; }
  50% { opacity: 0.5; }
}

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

.animate-fade-in { animation: fadeIn var(--transition-normal); }
.animate-slide-up { animation: slideUp var(--transition-normal); }
.animate-slide-in-left { animation: slideInLeft var(--transition-normal); }
.animate-scale-in { animation: scaleIn var(--transition-normal); }