/* 白色拟态主题 - 教学模板样式 */

/* ========== CSS变量定义（与header.css保持一致） ========== */
:root {
    --background-color: #ebecf0;
    --greyLight-1: #e4ebf5;
    --greyLight-2: #c8d0e7;
    --greyLight-3: #bec8e4;
    --greyDark: #6d85c1;
    --white: #fff;
    --text-a-color: #7a7e90;
    --text-a-hover: #8897d8;
    --text-li-color: #565e82;
    --primary: #6d5dfc;
    --primary-dark: #5b0eeb;
}

/* ========== 教学容器 ========== */
.teaching-container {
    width: 100%;
    max-width: 2000px;
    margin: 0 auto;
    min-height: calc(100vh - 140px);
    background: var(--background-color);
    padding: 40px 40px;
    box-sizing: border-box;
}

/* ========== 头部标题区域 ========== */
.teaching-header {
    text-align: center;
    margin-bottom: 35px;
}

.teaching-title {
    font-size: 36px;
    font-weight: 700;
    color: var(--text-li-color);
    margin-bottom: 12px;
    letter-spacing: 1px;
}

.teaching-description {
    font-size: 16px;
    color: var(--text-a-color);
    line-height: 1.8;
    max-width: 800px;
    margin: 0 auto;
}

/* ========== 搜索框区域 ========== */
.teaching-search-box {
    max-width: 600px;
    margin: 0 auto 40px;
    position: relative;
}

.teaching-search-input {
    width: 100%;
    padding: 12px 50px 12px 20px;
    background: var(--background-color);
    border: none;
    border-radius: 15px;
    font-size: 14px;
    transition: all 0.3s ease;
    box-shadow: 0.2rem 0.2rem 0.4rem var(--greyLight-2), -0.1rem -0.1rem 0.3rem var(--white);
    box-sizing: border-box;
    color: var(--text-li-color);
}

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

.teaching-search-input:focus {
    outline: none;
    box-shadow: inset 0.2rem 0.2rem 0.4rem var(--greyLight-2), inset -0.1rem -0.1rem 0.3rem var(--white);
}

.teaching-search-btn {
    position: absolute;
    right: 8px;
    top: 50%;
    transform: translateY(-50%);
    width: 36px;
    height: 36px;
    background: var(--background-color);
    border: none;
    border-radius: 50%;
    color: var(--primary);
    font-size: 16px;
    cursor: pointer;
    transition: all 0.3s ease;
    display: flex;
    align-items: center;
    justify-content: center;
    box-shadow: 0.2rem 0.2rem 0.4rem var(--greyLight-2), -0.1rem -0.1rem 0.3rem var(--white);
}

.teaching-search-btn:hover {
    box-shadow: inset 0.2rem 0.2rem 0.4rem var(--greyLight-2), inset -0.1rem -0.1rem 0.3rem var(--white);
    color: var(--primary-dark);
}

/* ========== 主导航区域 ========== */
.teaching-main-nav {
    display: flex;
    justify-content: center;
    gap: 16px;
    margin-bottom: 30px;
    flex-wrap: wrap;
    padding: 0;
}

.teaching-main-nav-btn {
    padding: 12px 28px;
    background: var(--background-color);
    border: none;
    border-radius: 15px;
    font-size: 15px;
    font-weight: 500;
    color: var(--text-li-color);
    cursor: pointer;
    transition: all 0.2s ease;
    box-shadow: 0.2rem 0.2rem 0.4rem var(--greyLight-2), -0.1rem -0.1rem 0.3rem var(--white);
}

.teaching-main-nav-btn:hover {
    box-shadow: inset 0.2rem 0.2rem 0.4rem var(--greyLight-2), inset -0.1rem -0.1rem 0.3rem var(--white);
    color: var(--primary);
}

.teaching-main-nav-btn.active {
    background: var(--background-color);
    box-shadow: inset 0.2rem 0.2rem 0.4rem var(--greyLight-2), inset -0.1rem -0.1rem 0.3rem var(--white);
    color: var(--primary);
}

/* ========== 子导航区域 ========== */
.teaching-sub-nav-container {
    display: flex;
    justify-content: center;
    align-items: center;
    gap: 12px;
    margin-bottom: 20px;
    padding: 12px 15px;
    flex-wrap: wrap;
    background: var(--background-color);
    border-radius: 15px;
    min-height: 60px;
    box-shadow: 0.2rem 0.2rem 0.4rem var(--greyLight-2), -0.1rem -0.1rem 0.3rem var(--white);
}

.teaching-sub-nav-btn {
    padding: 10px 20px;
    background: var(--background-color);
    border: none;
    border-radius: 12px;
    font-size: 14px;
    color: var(--text-li-color);
    cursor: pointer;
    transition: all 0.2s ease;
    font-weight: 500;
    box-shadow: 0.2rem 0.2rem 0.4rem var(--greyLight-2), -0.1rem -0.1rem 0.3rem var(--white);
}

.teaching-sub-nav-btn:hover {
    box-shadow: inset 0.2rem 0.2rem 0.4rem var(--greyLight-2), inset -0.1rem -0.1rem 0.3rem var(--white);
    color: var(--primary);
}

.teaching-sub-nav-btn.active {
    background: var(--background-color);
    box-shadow: inset 0.2rem 0.2rem 0.4rem var(--greyLight-2), inset -0.1rem -0.1rem 0.3rem var(--white);
    color: var(--primary);
}

/* ========== 教学内容区域 ========== */
.teaching-content-area {
    animation: fadeIn 1.4s ease;
}

/* ========== 教学展示区域 ========== */
.teaching-display {
    display: none;
    animation: fadeIn 0.5s ease;
}

.teaching-display.active {
    display: block;
}

/* ========== 教学卡片网格 ========== */
.teaching-grid {
    display: grid;
    grid-template-columns: repeat(5, 1fr);
    gap: 20px;
}

/* ========== 教学卡片样式 ========== */
.teaching-card {
    background: var(--background-color);
    border-radius: 12px;
    overflow: hidden;
    transition: all 0.3s ease;
    cursor: pointer;
    box-shadow: 0.2rem 0.2rem 0.4rem var(--greyLight-2), -0.1rem -0.1rem 0.3rem var(--white);
    border: none;
}

.teaching-card:hover {
    box-shadow: 0.3rem 0.3rem 0.6rem var(--greyLight-2), -0.2rem -0.2rem 0.5rem var(--white);
    transform: translateY(-5px);
}

/* ========== 卡片顶部图标/图片区域 ========== */
.teaching-card-image {
    width: 100%;
    aspect-ratio: 1920 / 1080;
    background-color: var(--background-color);
    display: flex;
    align-items: center;
    justify-content: center;
    position: relative;
    overflow: hidden;
    transform: translateZ(0);
}

.teaching-card-icon {
    font-size: 48px;
    position: relative;
    z-index: 1;
}

/* ========== 难度标签（左上角） ========== */
.teaching-difficulty {
    position: absolute;
    top: 10px;
    left: 10px;
    padding: 6px 14px;
    border-radius: 20px;
    font-size: 12px;
    font-weight: 600;
    z-index: 10;
    letter-spacing: 0.3px;
    transform: translateZ(0);
    will-change: auto;
    box-shadow: 0.2rem 0.2rem 0.4rem var(--greyLight-2), -0.1rem -0.1rem 0.3rem var(--white);
    border: none;
    background: var(--background-color) !important;
    background-image: none !important;
}

.difficulty-beginner {
    background: var(--background-color) !important;
    background-image: none !important;
    color: #4CAF50 !important;
}

.difficulty-intermediate {
    background: var(--background-color) !important;
    background-image: none !important;
    color: #FF9800 !important;
}

.difficulty-advanced {
    background: var(--background-color) !important;
    background-image: none !important;
    color: #ff5252 !important;
}

/* ========== 时长标签（右上角） ========== */
.teaching-duration {
    position: absolute;
    top: 10px;
    right: 10px;
    padding: 6px 12px;
    border-radius: 20px;
    background: var(--background-color);
    color: var(--text-li-color);
    font-size: 11px;
    font-weight: 500;
    z-index: 10;
    display: flex;
    align-items: center;
    gap: 4px;
    transform: translateZ(0);
    will-change: auto;
    box-shadow: 0.2rem 0.2rem 0.4rem var(--greyLight-2), -0.1rem -0.1rem 0.3rem var(--white);
    border: none;
}

/* ========== 卡片内容区域 ========== */
.teaching-card-body {
    padding: 15px;
}

.teaching-card-title {
    font-size: 15px;
    font-weight: 600;
    color: var(--text-li-color);
    margin-bottom: 8px;
    line-height: 1.4;
    display: -webkit-box;
    -webkit-line-clamp: 2;
    -webkit-box-orient: vertical;
    overflow: hidden;
}

.teaching-card-description {
    font-size: 13px;
    color: var(--text-a-color);
    line-height: 1.5;
    margin-bottom: 12px;
    display: -webkit-box;
    -webkit-line-clamp: 2;
    -webkit-box-orient: vertical;
    overflow: hidden;
}

/* ========== 卡片底部信息 ========== */
.teaching-card-footer {
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.teaching-card-views {
    display: flex;
    align-items: center;
    gap: 5px;
    color: var(--text-a-color);
    font-size: 13px;
    white-space: nowrap;
}

.teaching-card-views svg {
    width: 16px;
    height: 16px;
}

.teaching-card-learn-btn {
    padding: 6px 16px;
    background: var(--background-color);
    color: var(--text-li-color);
    border: none;
    border-radius: 6px;
    font-size: 12px;
    font-weight: 500;
    cursor: pointer;
    transition: all 0.3s ease;
    white-space: nowrap;
    transform: translateZ(0);
    box-shadow: 0.2rem 0.2rem 0.4rem var(--greyLight-2), -0.1rem -0.1rem 0.3rem var(--white);
}

.teaching-card-learn-btn:hover {
    box-shadow: inset 0.2rem 0.2rem 0.4rem var(--greyLight-2), inset -0.1rem -0.1rem 0.3rem var(--white);
    color: var(--primary);
}

/* ========== 加载和空状态 ========== */
.teaching-loading-state,
.teaching-empty-state {
    text-align: center;
    padding: 60px 20px;
    color: var(--text-a-color);
    background: var(--background-color);
    border-radius: 15px;
    box-shadow: 0.2rem 0.2rem 0.4rem var(--greyLight-2), -0.1rem -0.1rem 0.3rem var(--white);
    border: none;
    grid-column: 1 / -1;
}

.teaching-loading-state {
    font-size: 16px;
}

.teaching-empty-state {
    font-size: 14px;
}

/* ========== 分页样式 ========== */
.teaching-container .pagination-container {
    display: flex;
    justify-content: center;
    align-items: center;
    margin-top: 40px;
    gap: 10px;
    flex-wrap: wrap;
}

.teaching-container .pagination-btn {
    padding: 10px 16px;
    background: var(--background-color);
    border: none;
    border-radius: 12px;
    color: var(--text-li-color);
    cursor: pointer;
    transition: all 0.3s ease;
    font-size: 14px;
    font-weight: 500;
    min-width: 40px;
    text-align: center;
    box-shadow: 0.2rem 0.2rem 0.4rem var(--greyLight-2), -0.1rem -0.1rem 0.3rem var(--white);
}

.teaching-container .pagination-btn:hover:not(.disabled) {
    box-shadow: inset 0.2rem 0.2rem 0.4rem var(--greyLight-2), inset -0.1rem -0.1rem 0.3rem var(--white);
    color: var(--primary);
}

.teaching-container .pagination-btn.active {
    background: var(--background-color);
    box-shadow: inset 0.2rem 0.2rem 0.4rem var(--greyLight-2), inset -0.1rem -0.1rem 0.3rem var(--white);
    color: var(--primary);
}

.teaching-container .pagination-btn.disabled {
    opacity: 0.5;
    cursor: not-allowed;
    background: var(--background-color);
}

.teaching-container .pagination-info {
    padding: 8px 16px;
    color: var(--text-a-color);
    font-size: 14px;
    white-space: nowrap;
}

/* ========== 提示通知样式（会员权限提示等） ========== */
.teaching-toast {
    position: fixed !important;
    top: 60px !important;
    left: 50% !important;
    transform: translateX(-50%) translateY(-20px) !important;
    padding: 12px 20px !important;
    border-radius: 15px !important;
    font-size: 14px !important;
    z-index: 10001 !important;
    opacity: 0 !important;
    transition: all 0.3s ease !important;
    min-width: 300px !important;
    max-width: 500px !important;
    text-align: center !important;
    background: var(--background-color) !important;
    color: var(--text-li-color) !important;
    border: none !important;
    box-shadow: none !important;
}

.teaching-toast.show,
.teaching-toast[style*="opacity: 1"] {
    opacity: 1 !important;
    transform: translateX(-50%) translateY(0) !important;
    animation: slideDown 0.3s ease;
}

.teaching-toast.info,
.teaching-toast[class*="info"] {
    background: var(--background-color) !important;
    color: var(--primary) !important;
}

.teaching-toast.success,
.teaching-toast[class*="success"] {
    background: var(--background-color) !important;
    color: #10b981 !important;
}

.teaching-toast.error,
.teaching-toast[class*="error"] {
    background: var(--background-color) !important;
    color: #ef4444 !important;
}

.teaching-toast.warning,
.teaching-toast[class*="warning"] {
    background: var(--background-color) !important;
    color: #f59e0b !important;
}

@keyframes slideDown {
    from {
        opacity: 0;
        transform: translateX(-50%) translateY(-20px);
    }
    to {
        opacity: 1;
        transform: translateX(-50%) translateY(0);
    }
}

/* ========== 动画效果 ========== */
@keyframes fadeInDown {
    from {
        opacity: 0;
        transform: translateY(-30px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

@keyframes fadeInUp {
    from {
        opacity: 0;
        transform: translateY(30px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

@keyframes fadeIn {
    from {
        opacity: 0;
    }
    to {
        opacity: 1;
    }
}

/* ========== 响应式设计 ========== */
@media (max-width: 1400px) {
    .teaching-grid {
        grid-template-columns: repeat(4, 1fr);
    }
}

@media (max-width: 1024px) {
    .teaching-grid {
        grid-template-columns: repeat(3, 1fr);
    }
}

@media (max-width: 768px) {
    .teaching-container {
        padding: 25px 18px;
    }
    
    .teaching-title {
        font-size: 26px;
    }
    
    .teaching-description {
        font-size: 14px;
    }
    
    .teaching-grid {
        grid-template-columns: repeat(2, 1fr);
    }
    
    .teaching-main-nav-btn {
        padding: 10px 18px;
        font-size: 13px;
    }
    
    .teaching-sub-nav-btn {
        padding: 8px 14px;
        font-size: 12px;
    }
}

@media (max-width: 576px) {
    .teaching-grid {
        grid-template-columns: 1fr;
    }
}