/* ============================================
   学习资料页 - 资源管理
   ============================================ */

@import url('style.css');

body {
  min-height: 100vh;
  background: linear-gradient(135deg, #F8F0FF 0%, #FFF0F5 50%, #F0F8FF 100%);
}

.res-bg {
  position: fixed;
  inset: 0;
  z-index: -1;
  background-image:
    radial-gradient(circle at 10% 20%, rgba(155, 89, 182, 0.04) 0%, transparent 50%),
    radial-gradient(circle at 90% 80%, rgba(100, 149, 237, 0.04) 0%, transparent 50%);
}

/* ---------- 页头 ---------- */
.res-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 20px 24px;
  max-width: 800px;
  margin: 0 auto;
}

.back-btn {
  font-family: var(--font-body);
  text-decoration: none;
  color: var(--color-text-secondary);
  font-size: 0.9rem;
  padding: 8px 16px;
  border-radius: var(--radius-sm);
  transition: all var(--transition);
  background: rgba(255, 255, 255, 0.6);
  border: 1px solid var(--color-card-border);
}

.back-btn:hover {
  background: white;
  color: var(--color-primary);
  border-color: var(--color-primary-light);
}

.res-title {
  font-family: var(--font-display);
  font-size: 1.6rem;
  color: var(--color-primary-dark);
}

/* ---------- 添加卡片 ---------- */
.add-card {
  background: white;
  border-radius: var(--radius-md);
  padding: 24px;
  max-width: 600px;
  margin: 0 auto 24px;
  box-shadow: 0 4px 20px rgba(0, 0, 0, 0.06);
  border: 1px solid rgba(0, 0, 0, 0.04);
}

.add-form {
  display: flex;
  flex-direction: column;
  gap: 12px;
}

.form-row input {
  width: 100%;
  padding: 12px 16px;
  border: 1px solid var(--color-card-border);
  border-radius: var(--radius-sm);
  font-family: var(--font-body);
  font-size: 0.95rem;
  outline: none;
  transition: all var(--transition);
  background: var(--color-warm);
}

.form-row input:focus {
  border-color: var(--color-primary-light);
  box-shadow: 0 0 0 3px rgba(155, 89, 182, 0.08);
  background: white;
}

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

.btn-add-res {
  width: 100%;
  padding: 12px;
  border: none;
  background: var(--color-primary);
  color: white;
  border-radius: var(--radius-sm);
  font-family: var(--font-body);
  font-size: 1rem;
  cursor: pointer;
  transition: all var(--transition);
}

.btn-add-res:hover {
  background: var(--color-primary-dark);
  transform: translateY(-1px);
  box-shadow: 0 4px 12px rgba(155, 89, 182, 0.3);
}

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

/* ---------- 资料列表 ---------- */
.res-list {
  max-width: 600px;
  margin: 0 auto 40px;
  display: flex;
  flex-direction: column;
  gap: 8px;
}

.loading {
  text-align: center;
  color: var(--color-text-light);
  font-size: 0.9rem;
  padding: 40px;
}

/* ---------- 单条资料 ---------- */
.res-item {
  background: white;
  border-radius: var(--radius-sm);
  padding: 14px 18px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 12px;
  box-shadow: 0 2px 8px rgba(0, 0, 0, 0.04);
  border: 1px solid rgba(0, 0, 0, 0.04);
  transition: all var(--transition);
  animation: slideIn 0.3s ease;
}

.res-item:hover {
  box-shadow: 0 4px 16px rgba(155, 89, 182, 0.1);
  border-color: var(--color-card-border);
  transform: translateX(2px);
}

.res-item-left {
  flex: 1;
  min-width: 0;
}

.res-item-title {
  font-size: 0.95rem;
  font-weight: 500;
  color: var(--color-text);
  text-decoration: none;
  display: block;
  overflow: hidden;
  text-overflow: ellipsis;
  white-space: nowrap;
  transition: color var(--transition);
}

.res-item-title:hover {
  color: var(--color-primary);
}

.res-item-url {
  font-size: 0.75rem;
  color: var(--color-text-light);
  margin-top: 2px;
  overflow: hidden;
  text-overflow: ellipsis;
  white-space: nowrap;
}

.res-item-delete {
  background: none;
  border: none;
  font-size: 0.85rem;
  cursor: pointer;
  padding: 6px 10px;
  border-radius: 6px;
  color: var(--color-text-light);
  transition: all var(--transition);
  flex-shrink: 0;
  font-family: var(--font-body);
  opacity: 0;
}

.res-item:hover .res-item-delete {
  opacity: 1;
}

.res-item-delete:hover {
  background: rgba(235, 87, 87, 0.1);
  color: var(--color-danger);
}

/* 空状态 */
.empty-resources {
  text-align: center;
  color: var(--color-text-light);
  font-size: 0.95rem;
  padding: 60px 20px;
  line-height: 2;
}

/* ---------- 动画 ---------- */
@keyframes slideIn {
  from {
    opacity: 0;
    transform: translateX(-10px);
  }
  to {
    opacity: 1;
    transform: translateX(0);
  }
}

/* ---------- 响应式 ---------- */
@media (max-width: 768px) {
  .res-header {
    padding: 14px 16px;
  }

  .res-title {
    font-size: 1.2rem;
  }

  .add-card {
    margin: 0 14px 18px;
    padding: 18px;
  }

  .res-list {
    padding: 0 14px;
  }

  .res-item {
    padding: 12px 14px;
  }

  .res-item-delete {
    opacity: 1;
  }
}

@media (prefers-reduced-motion: reduce) {
  .res-item {
    animation: none;
  }
  .res-item:hover {
    transform: none;
  }
}