/* ============================================================
   Traework Design System - 青核 Youthome Web
   浅色主题 · 校园社交
   ============================================================ */

:root {
  /* ===== 品牌色 ===== */
  --primary: #17B0CF;
  --primary-hover: #1298B3;
  --primary-active: #0E8098;
  --primary-light: #73D3E6;
  --primary-lighter: #BCEAF3;
  --primary-bg: #E8F8FB;

  /* 辅助色 */
  --mint: #A8E6CF;      /* 浅薄荷青 */
  --charcoal: #3C3C3C;  /* 炭灰 */
  --beige: #FFF8F0;     /* 米白 */
  --warm-orange: #FFB980; /* 暖浅橙 */
  --warm-orange-bg: #FFF1DE;

  /* ===== 中性色 ===== */
  --bg-page: #F7F8FA;
  --bg-card: #FFFFFF;
  --bg-sidebar: #FFFFFF;
  --bg-hover: #F0F1F3;
  --bg-active: #E8F8FB;
  --bg-disabled: #F0F1F3;
  --bg-input: #FFFFFF;

  --text-primary: #1F1F1F;
  --text-secondary: #595959;
  --text-tertiary: #8C8C8C;
  --text-placeholder: #BFBFBF;
  --text-disabled: #BFBFBF;
  --text-white: #FFFFFF;

  --border: #E8E8E8;
  --border-light: #F0F0F0;
  --border-focus: #17B0CF;

  /* ===== 功能色 ===== */
  --success: #52C41A;
  --success-bg: #F6FFED;
  --warning: #FAAD14;
  --warning-bg: #FFFBE6;
  --error: #F5222D;
  --error-bg: #FFF1F0;

  /* ===== 阴影 ===== */
  --shadow-sm: 0 1px 2px rgba(0, 0, 0, 0.04);
  --shadow-card: 0 2px 12px rgba(0, 0, 0, 0.05);
  --shadow-md: 0 4px 16px rgba(0, 0, 0, 0.06);
  --shadow-lg: 0 8px 32px rgba(0, 0, 0, 0.08);
  --shadow-float: 0 12px 40px rgba(0, 0, 0, 0.1);

  /* ===== 圆角 ===== */
  --radius-xs: 4px;
  --radius-sm: 8px;    /* 按钮 */
  --radius-md: 12px;   /* 卡片 */
  --radius-lg: 16px;   /* 标签/弹窗低端 */
  --radius-xl: 20px;   /* 弹窗高端 */
  --radius-full: 9999px;

  /* ===== 尺寸 ===== */
  --control-height: 44px;
  --sidebar-width: 240px;
  --topbar-height: 56px;
  --nav-item-height: 48px;
  --nav-item-radius: 8px;
  --search-width: 360px;
  --search-height: 36px;
  --page-padding-x: 24px;
  --card-padding: 20px;
  --page-width: 1920px;
  --page-height: 1080px;
  --content-height: calc(1080px - 56px);

  /* ===== 毛玻璃 ===== */
  --glass-bg: rgba(255, 255, 255, 0.85);
  --glass-blur: blur(16px);

  /* ===== 过渡 ===== */
  --transition-fast: 0.15s ease;
  --transition-base: 0.2s ease;
  --transition-slow: 0.3s cubic-bezier(0.4, 0, 0.2, 1);
}

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

html, body {
  font-family: -apple-system, BlinkMacSystemFont, 'PingFang SC', 'Segoe UI', 'SF Pro Display', 'Helvetica Neue', 'Microsoft YaHei', sans-serif;
  background: var(--bg-page);
  color: var(--text-primary);
  font-size: 14px;
  line-height: 1.57;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

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

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

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

input, textarea, select {
  font-family: inherit;
  outline: none;
  background: transparent;
  color: inherit;
}

/* ============================================================
   按钮组件
   ============================================================ */

.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 6px;
  height: var(--control-height);
  padding: 0 20px;
  border-radius: var(--radius-sm);
  font-size: 14px;
  font-weight: 500;
  cursor: pointer;
  transition: all var(--transition-fast);
  border: 1px solid transparent;
  user-select: none;
  white-space: nowrap;
}

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

.btn-primary {
  background: var(--primary);
  color: #fff;
  box-shadow: 0 2px 8px rgba(23, 176, 207, 0.25);
}

.btn-primary:hover {
  background: var(--primary-hover);
  box-shadow: 0 4px 12px rgba(23, 176, 207, 0.3);
}

.btn-primary:active {
  background: var(--primary-active);
}

.btn-primary:disabled {
  background: var(--primary-lighter);
  cursor: not-allowed;
  box-shadow: none;
}

.btn-secondary {
  background: #fff;
  color: var(--text-secondary);
  border-color: var(--border);
}

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

.btn-outline {
  background: #fff;
  color: var(--primary);
  border-color: var(--primary);
}

.btn-outline:hover {
  background: var(--primary-bg);
}

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

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

.btn-danger {
  background: var(--error);
  color: #fff;
}

.btn-danger:hover {
  background: #E01F1F;
}

.btn-block {
  width: 100%;
}

.btn-sm {
  height: 32px;
  padding: 0 14px;
  font-size: 13px;
}

.btn-lg {
  height: 48px;
  padding: 0 28px;
  font-size: 15px;
}

.btn-icon {
  width: var(--control-height);
  padding: 0;
  border-radius: var(--radius-sm);
}

.btn-icon svg {
  width: 20px;
  height: 20px;
}

/* ============================================================
   输入框组件
   ============================================================ */

.input-wrap {
  position: relative;
}

.input {
  width: 100%;
  height: var(--control-height);
  padding: 0 14px;
  border: 1px solid var(--border);
  border-radius: var(--radius-sm);
  font-size: 14px;
  color: var(--text-primary);
  background: #fff;
  transition: all var(--transition-fast);
  /* 浅浮雕效果 */
  box-shadow: inset 0 1px 2px rgba(0, 0, 0, 0.03);
}

.input:hover {
  border-color: var(--text-tertiary);
}

.input:focus {
  border-color: var(--primary);
  box-shadow: 0 0 0 3px rgba(23, 176, 207, 0.12);
}

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

.input:disabled {
  background: var(--bg-disabled);
  color: var(--text-disabled);
  cursor: not-allowed;
}

.input.error {
  border-color: var(--error);
}

.input.error:focus {
  box-shadow: 0 0 0 3px rgba(245, 34, 45, 0.1);
}

.input-icon-left {
  padding-left: 42px;
}

.input-icon-right {
  padding-right: 42px;
}

.input-icon {
  position: absolute;
  top: 50%;
  transform: translateY(-50%);
  width: 18px;
  height: 18px;
  color: var(--text-tertiary);
  pointer-events: none;
}

.input-icon.left { left: 14px; }
.input-icon.right { right: 14px; }

.input-suffix-btn {
  position: absolute;
  right: 4px;
  top: 50%;
  transform: translateY(-50%);
  height: 36px;
  padding: 0 14px;
  font-size: 13px;
  font-weight: 500;
  color: var(--primary);
  background: var(--primary-bg);
  border-radius: 6px;
  border: none;
  cursor: pointer;
  transition: all var(--transition-fast);
}

.input-suffix-btn:hover {
  background: var(--primary-lighter);
}

.input-suffix-btn:disabled {
  color: var(--text-tertiary);
  background: var(--bg-hover);
  cursor: not-allowed;
}

.input-error-msg {
  font-size: 12px;
  color: var(--error);
  margin-top: 6px;
}

textarea.input {
  height: auto;
  min-height: 100px;
  padding: 12px 14px;
  resize: vertical;
  line-height: 1.6;
}

/* ============================================================
   标签组件
   ============================================================ */

.tag {
  display: inline-flex;
  align-items: center;
  gap: 4px;
  padding: 3px 12px;
  border-radius: var(--radius-lg);
  font-size: 12px;
  font-weight: 500;
  line-height: 1.6;
}

.tag-primary {
  background: var(--primary-bg);
  color: var(--primary);
}

.tag-success {
  background: var(--success-bg);
  color: var(--success);
}

.tag-warning {
  background: var(--warning-bg);
  color: var(--warning);
}

.tag-error {
  background: var(--error-bg);
  color: var(--error);
}

.tag-default {
  background: var(--bg-hover);
  color: var(--text-secondary);
}

.tag-orange {
  background: var(--warm-orange-bg);
  color: #E8871A;
}

.tag-mint {
  background: #E6FFEF;
  color: #2BA868;
}

.tag-outline {
  background: transparent;
  border: 1px solid var(--border);
  color: var(--text-secondary);
}

/* ============================================================
   卡片组件
   ============================================================ */

.card {
  background: var(--bg-card);
  border-radius: var(--radius-md);
  box-shadow: var(--shadow-card);
  border: 1px solid var(--border-light);
}

.card-hover {
  transition: all var(--transition-base);
  cursor: pointer;
}

.card-hover:hover {
  box-shadow: var(--shadow-md);
  transform: translateY(-2px);
}

/* ============================================================
   头像组件
   ============================================================ */

.avatar {
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  color: #fff;
  font-weight: 600;
  background: linear-gradient(135deg, var(--primary-light), var(--primary));
  flex-shrink: 0;
  overflow: hidden;
}

.avatar-sm { width: 28px; height: 28px; font-size: 11px; }
.avatar-md { width: 36px; height: 36px; font-size: 13px; }
.avatar-lg { width: 48px; height: 48px; font-size: 16px; }
.avatar-xl { width: 72px; height: 72px; font-size: 24px; }

.avatar.color-1 { background: linear-gradient(135deg, #73D3E6, #17B0CF); }
.avatar.color-2 { background: linear-gradient(135deg, #FFD4A3, #FF9F45); }
.avatar.color-3 { background: linear-gradient(135deg, #95E1B5, #52C41A); }
.avatar.color-4 { background: linear-gradient(135deg, #FFB3B3, #F5222D); }
.avatar.color-5 { background: linear-gradient(135deg, #B5D8FF, #4A90FF); }
.avatar.color-6 { background: linear-gradient(135deg, #D4B5FF, #9254DE); }
.avatar.color-7 { background: linear-gradient(135deg, #FFB3D9, #EB2F96); }
.avatar.color-8 { background: linear-gradient(135deg, #FFE58F, #FAAD14); }

/* ============================================================
   图标样式
   ============================================================ */

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

.icon svg {
  stroke-linecap: round;
  stroke-linejoin: round;
}

/* ============================================================
   全局滚动条
   ============================================================ */

::-webkit-scrollbar {
  width: 8px;
  height: 8px;
}

::-webkit-scrollbar-thumb {
  background: #D9D9D9;
  border-radius: 4px;
}

::-webkit-scrollbar-thumb:hover {
  background: #BFBFBF;
}

::-webkit-scrollbar-track {
  background: transparent;
}

/* ============================================================
   工具类
   ============================================================ */

.text-primary { color: var(--text-primary); }
.text-secondary { color: var(--text-secondary); }
.text-tertiary { color: var(--text-tertiary); }
.text-brand { color: var(--primary); }
.text-success { color: var(--success); }
.text-warning { color: var(--warning); }
.text-error { color: var(--error); }

.fw-400 { font-weight: 400; }
.fw-500 { font-weight: 500; }
.fw-600 { font-weight: 600; }
.fw-700 { font-weight: 700; }

.fs-12 { font-size: 12px; }
.fs-13 { font-size: 13px; }
.fs-14 { font-size: 14px; }
.fs-15 { font-size: 15px; }
.fs-16 { font-size: 16px; }
.fs-18 { font-size: 18px; }
.fs-20 { font-size: 20px; }
.fs-24 { font-size: 24px; }
.fs-32 { font-size: 32px; }

.gap-4 { gap: 4px; }
.gap-8 { gap: 8px; }
.gap-12 { gap: 12px; }
.gap-16 { gap: 16px; }
.gap-24 { gap: 24px; }

.mt-4 { margin-top: 4px; }
.mt-8 { margin-top: 8px; }
.mt-12 { margin-top: 12px; }
.mt-16 { margin-top: 16px; }
.mt-24 { margin-top: 24px; }
.mb-4 { margin-bottom: 4px; }
.mb-8 { margin-bottom: 8px; }
.mb-12 { margin-bottom: 12px; }
.mb-16 { margin-bottom: 16px; }
.mb-24 { margin-bottom: 24px; }

.flex { display: flex; }
.flex-col { display: flex; flex-direction: column; }
.items-center { align-items: center; }
.justify-center { justify-content: center; }
.justify-between { justify-content: space-between; }
.flex-1 { flex: 1; min-width: 0; }
.flex-shrink-0 { flex-shrink: 0; }

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

.ellipsis-2 {
  display: -webkit-box;
  -webkit-line-clamp: 2;
  -webkit-box-orient: vertical;
  overflow: hidden;
}

.ellipsis-3 {
  display: -webkit-box;
  -webkit-line-clamp: 3;
  -webkit-box-orient: vertical;
  overflow: hidden;
}