/**
 * ============================================================================
 * 赞助系统 - 轻奢高级 UI 样式
 * 设计哲学：克制、优雅、质感、呼吸感
 * 色彩体系：深空黑金 + 暖灰过渡
 * ============================================================================
 */

/* CSS Variables - 设计令牌 */
:root {
  /* 主色调 */
  --sp-gold-primary: #C9A96E;
  --sp-gold-light: #E6C88A;
  --sp-gold-dark: #A08255;
  --sp-gold-subtle: rgba(201, 169, 110, 0.08);
  
  /* 背景色阶 */
  --sp-bg-primary: #0D1117;
  --sp-bg-secondary: #161B22;
  --sp-bg-tertiary: #1C2128;
  --sp-bg-elevated: #21262D;
  
  /* 边框与分割 */
  --sp-border-subtle: rgba(48, 54, 61, 0.6);
  --sp-border-default: #30363D;
  --sp-border-gold: rgba(201, 169, 110, 0.3);
  
  /* 文字色阶 */
  --sp-text-primary: #E6EDF3;
  --sp-text-secondary: #8B949E;
  --sp-text-tertiary: #6E7681;
  --sp-text-muted: #484F58;
  
  /* 奖牌色 */
  --sp-gold-medal: linear-gradient(135deg, #FFD700 0%, #FFA500 100%);
  --sp-silver-medal: linear-gradient(135deg, #E8E8E8 0%, #C0C0C0 100%);
  --sp-bronze-medal: linear-gradient(135deg, #CD7F32 0%, #A0522D 100%);
  
  /* 间距系统 */
  --sp-space-xs: 4px;
  --sp-space-sm: 8px;
  --sp-space-md: 16px;
  --sp-space-lg: 24px;
  --sp-space-xl: 32px;
  --sp-space-2xl: 48px;
  --sp-space-3xl: 64px;
  
  /* 圆角系统 */
  --sp-radius-sm: 6px;
  --sp-radius-md: 10px;
  --sp-radius-lg: 16px;
  --sp-radius-xl: 24px;
  
  /* 阴影系统 */
  --sp-shadow-sm: 0 2px 8px rgba(0, 0, 0, 0.2);
  --sp-shadow-md: 0 4px 16px rgba(0, 0, 0, 0.25);
  --sp-shadow-lg: 0 8px 32px rgba(0, 0, 0, 0.3);
  --sp-shadow-gold: 0 4px 24px rgba(201, 169, 110, 0.12);
  
  /* 过渡曲线 */
  --sp-ease-out: cubic-bezier(0.16, 1, 0.3, 1);
  --sp-ease-in-out: cubic-bezier(0.65, 0, 0.35, 1);
}

/* ============================================================================
   页面横幅 - 沉浸式 Hero
   ============================================================================ */
.sp-banner {
  position: relative;
  padding: var(--sp-space-3xl) 0 var(--sp-space-2xl);
  background: 
    radial-gradient(ellipse 80% 50% at 50% -20%, rgba(201, 169, 110, 0.12), transparent),
    radial-gradient(ellipse 60% 40% at 80% 100%, rgba(201, 169, 110, 0.05), transparent),
    linear-gradient(180deg, var(--sp-bg-primary) 0%, var(--sp-bg-secondary) 100%);
  overflow: hidden;
}

.sp-banner::before {
  content: '';
  position: absolute;
  inset: 0;
  background: 
    radial-gradient(circle at 20% 80%, rgba(201, 169, 110, 0.03) 0%, transparent 40%),
    radial-gradient(circle at 80% 20%, rgba(201, 169, 110, 0.03) 0%, transparent 40%);
  pointer-events: none;
}

.sp-banner-content {
  position: relative;
  z-index: 1;
  text-align: center;
  max-width: 640px;
  margin: 0 auto;
}

.sp-banner-title {
  font-size: clamp(1.75rem, 4vw, 2.5rem);
  font-weight: 700;
  color: var(--sp-text-primary);
  letter-spacing: -0.02em;
  margin-bottom: var(--sp-space-md);
  line-height: 1.2;
}

.sp-banner-title .gradient-text {
  background: linear-gradient(135deg, var(--sp-gold-primary) 0%, var(--sp-gold-light) 50%, var(--sp-gold-primary) 100%);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

.sp-banner-desc {
  font-size: 1.0625rem;
  color: var(--sp-text-secondary);
  line-height: 1.6;
  max-width: 480px;
  margin: 0 auto;
}

/* ============================================================================
   统计区域 - 悬浮卡片
   ============================================================================ */
.sp-stats-section {
  padding: var(--sp-space-xl) 0;
  margin-top: calc(var(--sp-space-xl) * -1);
  position: relative;
  z-index: 2;
}

.sp-stats-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: var(--sp-space-lg);
  max-width: 840px;
  margin: 0 auto;
}

.sp-stat-card {
  background: var(--sp-bg-secondary);
  border: 1px solid var(--sp-border-subtle);
  border-radius: var(--sp-radius-lg);
  padding: var(--sp-space-lg);
  text-align: center;
  transition: all 0.4s var(--sp-ease-out);
  position: relative;
  overflow: hidden;
}

.sp-stat-card::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  height: 2px;
  background: linear-gradient(90deg, transparent, var(--sp-gold-primary), transparent);
  opacity: 0;
  transition: opacity 0.3s;
}

.sp-stat-card:hover {
  transform: translateY(-4px);
  border-color: var(--sp-border-gold);
  box-shadow: var(--sp-shadow-gold);
}

.sp-stat-card:hover::before {
  opacity: 1;
}

.sp-stat-icon {
  width: 44px;
  height: 44px;
  margin: 0 auto var(--sp-space-sm);
  display: flex;
  align-items: center;
  justify-content: center;
  background: var(--sp-gold-subtle);
  border-radius: var(--sp-radius-md);
  color: var(--sp-gold-primary);
  font-size: 1.125rem;
  transition: all 0.3s var(--sp-ease-out);
}

.sp-stat-card:hover .sp-stat-icon {
  background: rgba(201, 169, 110, 0.15);
  transform: scale(1.05);
}

.sp-stat-value {
  font-size: 1.75rem;
  font-weight: 700;
  color: var(--sp-text-primary);
  margin-bottom: var(--sp-space-xs);
  font-variant-numeric: tabular-nums;
  letter-spacing: -0.01em;
}

.sp-stat-label {
  font-size: 0.8125rem;
  color: var(--sp-text-secondary);
  font-weight: 500;
}

/* ============================================================================
   主内容区域 - 双栏布局
   ============================================================================ */
.sp-main-section {
  padding: var(--sp-space-2xl) 0;
}

.sp-main-grid {
  display: grid;
  grid-template-columns: 1.1fr 0.9fr;
  gap: var(--sp-space-xl);
  align-items: start;
}

/* 面板通用样式 */
.sp-panel {
  background: var(--sp-bg-secondary);
  border: 1px solid var(--sp-border-subtle);
  border-radius: var(--sp-radius-xl);
  overflow: hidden;
  transition: border-color 0.3s;
}

.sp-panel:hover {
  border-color: var(--sp-border-default);
}

.sp-panel-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: var(--sp-space-lg) var(--sp-space-xl);
  border-bottom: 1px solid var(--sp-border-subtle);
  background: linear-gradient(180deg, rgba(201, 169, 110, 0.02) 0%, transparent 100%);
}

.sp-panel-header h2 {
  font-size: 1.125rem;
  font-weight: 600;
  color: var(--sp-text-primary);
  display: flex;
  align-items: center;
  gap: var(--sp-space-sm);
  margin: 0;
}

.sp-panel-header h2 i {
  color: var(--sp-gold-primary);
  font-size: 1rem;
}

.sp-panel-body {
  padding: var(--sp-space-xl);
}

.sp-view-all {
  font-size: 0.8125rem;
  color: var(--sp-gold-primary);
  text-decoration: none;
  display: flex;
  align-items: center;
  gap: var(--sp-space-xs);
  font-weight: 500;
  transition: all 0.2s;
}

.sp-view-all:hover {
  color: var(--sp-gold-light);
  gap: var(--sp-space-sm);
}

/* ============================================================================
   赞助表单 - 精致交互
   ============================================================================ */
.sp-donate-form {
  display: flex;
  flex-direction: column;
  gap: var(--sp-space-lg);
}

.sp-form-group {
  display: flex;
  flex-direction: column;
  gap: var(--sp-space-sm);
}

.sp-form-label {
  font-size: 0.875rem;
  font-weight: 500;
  color: var(--sp-text-primary);
}

.sp-amount-presets {
  display: grid;
  grid-template-columns: repeat(5, 1fr);
  gap: var(--sp-space-sm);
}

.sp-amount-btn {
  padding: var(--sp-space-sm) var(--sp-space-md);
  background: var(--sp-bg-elevated);
  border: 1px solid var(--sp-border-subtle);
  border-radius: var(--sp-radius-md);
  color: var(--sp-text-secondary);
  font-size: 0.875rem;
  font-weight: 500;
  cursor: pointer;
  transition: all 0.25s var(--sp-ease-out);
  position: relative;
  overflow: hidden;
}

.sp-amount-btn::before {
  content: '';
  position: absolute;
  inset: 0;
  background: linear-gradient(135deg, var(--sp-gold-subtle) 0%, transparent 100%);
  opacity: 0;
  transition: opacity 0.25s;
}

.sp-amount-btn:hover {
  border-color: var(--sp-border-gold);
  color: var(--sp-gold-primary);
}

.sp-amount-btn:hover::before {
  opacity: 1;
}

.sp-amount-btn.active {
  background: var(--sp-gold-subtle);
  border-color: var(--sp-gold-primary);
  color: var(--sp-gold-primary);
}

.sp-amount-btn.active::before {
  opacity: 1;
}

.sp-form-input,
.sp-form-textarea {
  width: 100%;
  padding: var(--sp-space-md);
  background: var(--sp-bg-primary);
  border: 1px solid var(--sp-border-subtle);
  border-radius: var(--sp-radius-md);
  color: var(--sp-text-primary);
  font-size: 1rem;
  font-family: inherit;
  transition: all 0.25s var(--sp-ease-out);
  box-sizing: border-box;
}

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

.sp-form-input:hover,
.sp-form-textarea:hover {
  border-color: var(--sp-border-default);
}

.sp-form-input:focus,
.sp-form-textarea:focus {
  outline: none;
  border-color: var(--sp-gold-primary);
  box-shadow: 0 0 0 3px rgba(201, 169, 110, 0.1);
}

.sp-form-textarea {
  min-height: 100px;
  resize: vertical;
  line-height: 1.5;
}

.sp-char-count {
  text-align: right;
  font-size: 0.75rem;
  color: var(--sp-text-tertiary);
  font-weight: 500;
}

/* 复选框 */
.sp-checkbox-label {
  display: flex;
  align-items: center;
  gap: var(--sp-space-sm);
  cursor: pointer;
  font-size: 0.875rem;
  color: var(--sp-text-secondary);
  user-select: none;
}

.sp-checkbox-label input[type="checkbox"] {
  position: absolute;
  opacity: 0;
  width: 0;
  height: 0;
}

.sp-checkbox-custom {
  width: 20px;
  height: 20px;
  border: 1.5px solid var(--sp-border-default);
  border-radius: var(--sp-radius-sm);
  background: var(--sp-bg-primary);
  display: flex;
  align-items: center;
  justify-content: center;
  transition: all 0.2s var(--sp-ease-out);
  flex-shrink: 0;
}

.sp-checkbox-label:hover .sp-checkbox-custom {
  border-color: var(--sp-gold-primary);
}

.sp-checkbox-label input:checked + .sp-checkbox-custom {
  background: var(--sp-gold-primary);
  border-color: var(--sp-gold-primary);
}

.sp-checkbox-label input:checked + .sp-checkbox-custom::after {
  content: '';
  width: 5px;
  height: 9px;
  border: solid var(--sp-bg-primary);
  border-width: 0 2px 2px 0;
  transform: rotate(45deg) translate(-1px, -1px);
}

/* 提交按钮 */
.sp-submit-btn {
  width: 100%;
  padding: var(--sp-space-md) var(--sp-space-lg);
  background: linear-gradient(135deg, var(--sp-gold-primary) 0%, var(--sp-gold-dark) 100%);
  border: none;
  border-radius: var(--sp-radius-md);
  color: var(--sp-bg-primary);
  font-size: 1rem;
  font-weight: 600;
  cursor: pointer;
  transition: all 0.3s var(--sp-ease-out);
  display: flex;
  align-items: center;
  justify-content: center;
  gap: var(--sp-space-sm);
  position: relative;
  overflow: hidden;
}

.sp-submit-btn::before {
  content: '';
  position: absolute;
  inset: 0;
  background: linear-gradient(135deg, var(--sp-gold-light) 0%, var(--sp-gold-primary) 100%);
  opacity: 0;
  transition: opacity 0.3s;
}

.sp-submit-btn:hover {
  transform: translateY(-2px);
  box-shadow: var(--sp-shadow-gold);
}

.sp-submit-btn:hover::before {
  opacity: 1;
}

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

.sp-submit-btn span,
.sp-submit-btn i {
  position: relative;
  z-index: 1;
}

.sp-submit-btn:disabled {
  opacity: 0.6;
  cursor: not-allowed;
  transform: none;
}

/* ============================================================================
   排行榜 - 精致列表
   ============================================================================ */
.sp-ranking-list {
  display: flex;
  flex-direction: column;
  gap: var(--sp-space-sm);
}

.sp-ranking-item {
  display: flex;
  align-items: center;
  gap: var(--sp-space-md);
  padding: var(--sp-space-md);
  background: var(--sp-bg-elevated);
  border: 1px solid transparent;
  border-radius: var(--sp-radius-md);
  transition: all 0.25s var(--sp-ease-out);
}

.sp-ranking-item:hover {
  background: var(--sp-bg-tertiary);
  border-color: var(--sp-border-subtle);
  transform: translateX(4px);
}

.sp-rank-badge {
  width: 28px;
  height: 28px;
  border-radius: 50%;
  background: var(--sp-bg-tertiary);
  color: var(--sp-text-tertiary);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 0.75rem;
  font-weight: 700;
  flex-shrink: 0;
  font-variant-numeric: tabular-nums;
}

.sp-rank-top1 .sp-rank-badge {
  background: var(--sp-gold-medal);
  color: var(--sp-bg-primary);
  box-shadow: 0 2px 8px rgba(255, 215, 0, 0.3);
}

.sp-rank-top2 .sp-rank-badge {
  background: var(--sp-silver-medal);
  color: var(--sp-bg-primary);
}

.sp-rank-top3 .sp-rank-badge {
  background: var(--sp-sp-bronze-medal);
  color: #fff;
}

.sp-rank-avatar {
  width: 38px;
  height: 38px;
  border-radius: 50%;
  object-fit: cover;
  flex-shrink: 0;
  border: 2px solid var(--sp-border-subtle);
  transition: border-color 0.2s;
}

.sp-ranking-item:hover .sp-rank-avatar {
  border-color: var(--sp-border-gold);
}

.sp-rank-info {
  flex: 1;
  min-width: 0;
}

.sp-rank-name {
  font-size: 0.9375rem;
  font-weight: 500;
  color: var(--sp-text-primary);
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
}

.sp-rank-count {
  font-size: 0.75rem;
  color: var(--sp-text-tertiary);
  margin-top: 2px;
}

.sp-rank-amount {
  font-size: 0.9375rem;
  font-weight: 600;
  color: var(--sp-gold-primary);
  flex-shrink: 0;
  font-variant-numeric: tabular-nums;
}

/* ============================================================================
   最近赞助 - 时间线风格
   ============================================================================ */
.sp-recent-section {
  padding: var(--sp-space-2xl) 0 var(--sp-space-3xl);
}

.sp-section-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  margin-bottom: var(--sp-space-lg);
}

.sp-section-header h2 {
  font-size: 1.25rem;
  font-weight: 600;
  color: var(--sp-text-primary);
  display: flex;
  align-items: center;
  gap: var(--sp-space-sm);
  margin: 0;
}

.sp-section-header h2 i {
  color: var(--sp-gold-primary);
}

.sp-recent-list {
  display: flex;
  flex-direction: column;
  gap: var(--sp-space-md);
}

.sp-recent-item {
  display: flex;
  align-items: center;
  gap: var(--sp-space-md);
  padding: var(--sp-space-md) var(--sp-space-lg);
  background: var(--sp-bg-secondary);
  border: 1px solid var(--sp-border-subtle);
  border-radius: var(--sp-radius-lg);
  transition: all 0.25s var(--sp-ease-out);
}

.sp-recent-item:hover {
  border-color: var(--sp-border-gold);
  background: var(--sp-bg-tertiary);
  transform: translateY(-2px);
  box-shadow: var(--sp-shadow-md);
}

.sp-recent-avatar {
  width: 48px;
  height: 48px;
  border-radius: 50%;
  object-fit: cover;
  flex-shrink: 0;
  border: 2px solid var(--sp-border-subtle);
}

.sp-anonymous-avatar {
  background: var(--sp-bg-elevated);
  display: flex;
  align-items: center;
  justify-content: center;
  color: var(--sp-text-tertiary);
  font-size: 1.25rem;
}

.sp-recent-info {
  flex: 1;
  min-width: 0;
}

.sp-recent-name {
  font-size: 0.9375rem;
  font-weight: 500;
  color: var(--sp-text-primary);
}

.sp-recent-msg {
  font-size: 0.8125rem;
  color: var(--sp-text-secondary);
  margin-top: var(--sp-space-xs);
  line-height: 1.4;
  display: -webkit-box;
  -webkit-line-clamp: 2;
  -webkit-box-orient: vertical;
  overflow: hidden;
}

.sp-recent-right {
  text-align: right;
  flex-shrink: 0;
}

.sp-recent-amount {
  font-size: 1.125rem;
  font-weight: 700;
  color: var(--sp-gold-primary);
  font-variant-numeric: tabular-nums;
}

.sp-recent-time {
  font-size: 0.75rem;
  color: var(--sp-text-tertiary);
  margin-top: var(--sp-space-xs);
}

/* ============================================================================
   空状态
   ============================================================================ */
.sp-empty {
  text-align: center;
  padding: var(--sp-space-3xl) var(--sp-space-lg);
  color: var(--sp-text-secondary);
}

.sp-empty i {
  font-size: 3.5rem;
  color: var(--sp-text-muted);
  margin-bottom: var(--sp-space-md);
  display: block;
  opacity: 0.5;
}

.sp-empty p {
  font-size: 1rem;
  margin: 0;
}

/* ============================================================================
   Toast 通知 - 悬浮提示
   ============================================================================ */
.sp-toast {
  position: fixed;
  top: 24px;
  right: 24px;
  padding: var(--sp-space-md) var(--sp-space-lg);
  background: var(--sp-bg-secondary);
  border: 1px solid var(--sp-border-default);
  border-radius: var(--sp-radius-md);
  color: var(--sp-text-primary);
  font-size: 0.9375rem;
  font-weight: 500;
  display: flex;
  align-items: center;
  gap: var(--sp-space-sm);
  box-shadow: var(--sp-shadow-lg);
  z-index: 9999;
  transform: translateX(120%);
  opacity: 0;
  transition: all 0.4s var(--sp-ease-out);
}

.sp-toast.show {
  transform: translateX(0);
  opacity: 1;
}

.sp-toast.success {
  border-color: rgba(46, 160, 67, 0.5);
  background: linear-gradient(135deg, rgba(46, 160, 67, 0.1) 0%, var(--sp-bg-secondary) 100%);
}

.sp-toast.success i {
  color: #3FB950;
}

.sp-toast.error {
  border-color: rgba(248, 81, 73, 0.5);
  background: linear-gradient(135deg, rgba(248, 81, 73, 0.1) 0%, var(--sp-bg-secondary) 100%);
}

.sp-toast.error i {
  color: #F85149;
}

/* ============================================================================
   响应式适配
   ============================================================================ */
@media (max-width: 992px) {
  .sp-main-grid {
    grid-template-columns: 1fr;
  }
  
  .sp-amount-presets {
    grid-template-columns: repeat(3, 1fr);
  }
}

@media (max-width: 768px) {
  .sp-stats-grid {
    grid-template-columns: 1fr;
    gap: var(--sp-space-md);
  }
  
  .sp-banner {
    padding: var(--sp-space-2xl) 0 var(--sp-space-xl);
  }
  
  .sp-panel-header,
  .sp-panel-body {
    padding: var(--sp-space-md);
  }
  
  .sp-recent-item {
    flex-wrap: wrap;
  }
  
  .sp-recent-right {
    width: 100%;
    text-align: left;
    display: flex;
    justify-content: space-between;
    margin-top: var(--sp-space-sm);
    padding-top: var(--sp-space-sm);
    border-top: 1px solid var(--sp-border-subtle);
  }
}

@media (max-width: 480px) {
  .sp-amount-presets {
    grid-template-columns: repeat(2, 1fr);
  }
  
  .sp-ranking-item {
    padding: var(--sp-space-sm);
  }
  
  .sp-rank-avatar {
    width: 32px;
    height: 32px;
  }
}