/* ===========================================
   CSS 变量 - 定义全局颜色和尺寸
   =========================================== */
:root {
    --primary-color: #3498db;
    --primary-hover: #2980b9;
    --secondary-color: #2c3e50;
    --background-color: #f5f7fa;
    --card-background: #ffffff;
    --text-primary: #2c3e50;
    --text-secondary: #7f8c8d;
    --border-color: #e0e0e0;
    --success-color: #27ae60;
    --warning-color: #f39c12;
    --danger-color: #e74c3c;
    --shadow: 0 4px 6px rgba(0, 0, 0, 0.1);
    --shadow-lg: 0 10px 30px rgba(0, 0, 0, 0.15);
    --border-radius: 12px;
    --transition: all 0.3s ease;
}

/* ===========================================
   全局重置和基础样式
   =========================================== */
* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

body {
    font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', 'PingFang SC', 'Hiragino Sans GB',
                 'Microsoft YaHei', sans-serif;
    background-color: var(--background-color);
    color: var(--text-primary);
    line-height: 1.6;
    min-height: 100vh;
    display: flex;
    flex-direction: column;
}

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

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

/* ===========================================
   容器布局
   =========================================== */
.container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 1rem;
    flex: 1;
    display: flex;
    flex-direction: column;
}

/* ===========================================
   页头样式
   =========================================== */
.header {
    text-align: center;
    padding: 2rem 0 1.5rem;
}

.header h1 {
    font-size: 2.5rem;
    color: var(--secondary-color);
    margin-bottom: 0.5rem;
}

.subtitle {
    color: var(--text-secondary);
    font-size: 1.1rem;
}

/* ===========================================
   分类筛选按钮组
   =========================================== */
.category-filter {
    display: flex;
    justify-content: center;
    flex-wrap: wrap;
    gap: 0.75rem;
    padding: 1.5rem 0;
    margin-bottom: 1rem;
}

.filter-btn {
    padding: 0.6rem 1.2rem;
    border: 2px solid var(--border-color);
    background: var(--card-background);
    color: var(--text-primary);
    border-radius: 25px;
    cursor: pointer;
    font-size: 0.95rem;
    font-weight: 500;
    transition: var(--transition);
}

.filter-btn:hover {
    border-color: var(--primary-color);
    color: var(--primary-color);
    transform: translateY(-2px);
}

.filter-btn.active {
    background: var(--primary-color);
    border-color: var(--primary-color);
    color: white;
}

/* ===========================================
   主内容区域
   =========================================== */
.main-content {
    flex: 1;
    display: flex;
    flex-direction: column;
    align-items: center;
    max-width: 800px;
    width: 100%;
    margin: 0 auto;
}

/* ===========================================
   动物卡片
   =========================================== */
.animal-card {
    background: var(--card-background);
    border-radius: var(--border-radius);
    box-shadow: var(--shadow-lg);
    padding: 2rem;
    width: 100%;
    min-height: 500px;
    display: flex;
    flex-direction: column;
    justify-content: center;
    position: relative;
}

/* ===========================================
   图片容器
   =========================================== */
.image-container {
    width: 100%;
    height: 400px;
    border-radius: var(--border-radius);
    overflow: hidden;
    margin-bottom: 1.5rem;
    background: var(--background-color);
    display: flex;
    align-items: center;
    justify-content: center;
}

.animal-image {
    width: 100%;
    height: 100%;
    object-fit: cover;
    transition: transform 0.3s ease;
}

.animal-image:hover {
    transform: scale(1.05);
}

/* ===========================================
   动物信息
   =========================================== */
.animal-info {
    text-align: center;
}

.animal-name {
    font-size: 2rem;
    color: var(--secondary-color);
    margin-bottom: 0.5rem;
    font-weight: 700;
}

.scientific-name {
    font-size: 1.2rem;
    color: var(--text-secondary);
    font-style: italic;
    margin-bottom: 1.5rem;
}

/* ===========================================
   信息网格
   =========================================== */
.info-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
    gap: 1rem;
    margin-bottom: 1.5rem;
}

.info-item {
    padding: 1rem;
    background: var(--background-color);
    border-radius: 8px;
    text-align: left;
}

.info-label {
    font-weight: 600;
    color: var(--text-secondary);
    font-size: 0.9rem;
}

.info-value {
    color: var(--text-primary);
    font-size: 1rem;
    margin-left: 0.5rem;
}

/* ===========================================
   版权归属
   =========================================== */
.attribution {
    background: #f8f9fa;
    border-left: 4px solid var(--primary-color);
    padding: 1rem;
    margin-top: 1.5rem;
    border-radius: 4px;
    text-align: left;
}

.attribution-text {
    font-size: 0.85rem;
    color: var(--text-secondary);
    line-height: 1.6;
}

.attribution a {
    color: var(--primary-color);
    text-decoration: underline;
}

/* ===========================================
   加载状态
   =========================================== */
.loading-state {
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    padding: 3rem;
}

.spinner {
    width: 50px;
    height: 50px;
    border: 4px solid var(--border-color);
    border-top-color: var(--primary-color);
    border-radius: 50%;
    animation: spin 1s linear infinite;
}

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

.loading-state p {
    margin-top: 1rem;
    color: var(--text-secondary);
    font-size: 1.1rem;
}

/* ===========================================
   错误状态
   =========================================== */
.error-state {
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    padding: 3rem;
    text-align: center;
}

.error-icon {
    font-size: 4rem;
    margin-bottom: 1rem;
}

.error-message {
    font-size: 1.3rem;
    color: var(--danger-color);
    font-weight: 600;
    margin-bottom: 0.5rem;
}

.error-detail {
    color: var(--text-secondary);
    font-size: 1rem;
}

/* ===========================================
   隐藏类
   =========================================== */
.hidden {
    display: none !important;
}

/* ===========================================
   操作按钮
   =========================================== */
.action-buttons {
    display: flex;
    justify-content: center;
    gap: 1rem;
    margin-top: 2rem;
    width: 100%;
}

.btn {
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 0.5rem;
    padding: 1rem 2rem;
    border: none;
    border-radius: 50px;
    font-size: 1.1rem;
    font-weight: 600;
    cursor: pointer;
    transition: var(--transition);
    box-shadow: var(--shadow);
}

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

.btn-primary:hover {
    background: var(--primary-hover);
    transform: translateY(-2px);
    box-shadow: var(--shadow-lg);
}

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

.btn-icon {
    font-size: 1.3rem;
}

/* ===========================================
   页脚
   =========================================== */
.footer {
    text-align: center;
    padding: 2rem 0;
    margin-top: 3rem;
    border-top: 1px solid var(--border-color);
    color: var(--text-secondary);
    font-size: 0.9rem;
}

.footer p {
    margin: 0.5rem 0;
}

.footer a {
    color: var(--primary-color);
}

/* ===========================================
   响应式设计 - 平板
   =========================================== */
@media (max-width: 768px) {
    .header h1 {
        font-size: 2rem;
    }

    .subtitle {
        font-size: 1rem;
    }

    .category-filter {
        gap: 0.5rem;
    }

    .filter-btn {
        padding: 0.5rem 1rem;
        font-size: 0.85rem;
    }

    .animal-card {
        padding: 1.5rem;
    }

    .image-container {
        height: 300px;
    }

    .animal-name {
        font-size: 1.6rem;
    }

    .scientific-name {
        font-size: 1rem;
    }

    .info-grid {
        grid-template-columns: 1fr;
    }
}

/* ===========================================
   响应式设计 - 手机
   =========================================== */
@media (max-width: 480px) {
    .container {
        padding: 0.5rem;
    }

    .header {
        padding: 1.5rem 0 1rem;
    }

    .header h1 {
        font-size: 1.6rem;
    }

    .subtitle {
        font-size: 0.9rem;
    }

    .category-filter {
        gap: 0.4rem;
        padding: 1rem 0;
    }

    .filter-btn {
        padding: 0.4rem 0.8rem;
        font-size: 0.8rem;
    }

    .animal-card {
        padding: 1rem;
        min-height: auto;
    }

    .image-container {
        height: 250px;
        margin-bottom: 1rem;
    }

    .animal-name {
        font-size: 1.4rem;
    }

    .scientific-name {
        font-size: 0.95rem;
        margin-bottom: 1rem;
    }

    .info-item {
        padding: 0.75rem;
    }

    .btn {
        padding: 0.8rem 1.5rem;
        font-size: 1rem;
    }

    .attribution {
        padding: 0.75rem;
        margin-top: 1rem;
    }

    .attribution-text {
        font-size: 0.75rem;
    }

    .footer {
        font-size: 0.8rem;
        padding: 1.5rem 0;
        margin-top: 2rem;
    }
}

/* ===========================================
   Grid Settings
   =========================================== */
.grid-settings {
    display: flex;
    flex-direction: column;
    align-items: center;
    margin-bottom: 1.5rem;
}

.settings-toggle {
    padding: 0.6rem 1.5rem;
    background: var(--card-background);
    border: 2px solid var(--primary-color);
    color: var(--primary-color);
    border-radius: 25px;
    cursor: pointer;
    font-size: 1rem;
    font-weight: 600;
    transition: var(--transition);
}

.settings-toggle:hover {
    background: var(--primary-color);
    color: white;
}

.settings-panel {
    background: var(--card-background);
    border: 2px solid var(--border-color);
    border-radius: var(--border-radius);
    padding: 1.5rem;
    margin-top: 1rem;
    box-shadow: var(--shadow);
    display: flex;
    gap: 1.5rem;
    align-items: center;
    flex-wrap: wrap;
}

.setting-item {
    display: flex;
    align-items: center;
    gap: 0.5rem;
}

.setting-item label {
    font-weight: 600;
    color: var(--text-primary);
}

.setting-item input[type="number"] {
    width: 70px;
    padding: 0.5rem;
    border: 2px solid var(--border-color);
    border-radius: 8px;
    font-size: 1rem;
    text-align: center;
}

.setting-item input[type="number"]:focus {
    outline: none;
    border-color: var(--primary-color);
}

.btn-apply {
    padding: 0.6rem 1.5rem;
    background: var(--primary-color);
    color: white;
    border: none;
    border-radius: 8px;
    cursor: pointer;
    font-size: 1rem;
    font-weight: 600;
    transition: var(--transition);
}

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

/* ===========================================
   Animal Grid Layout
   =========================================== */
.animal-grid {
    display: grid;
    gap: 1.5rem;
    width: 100%;
    margin-bottom: 2rem;
}

.animal-grid-item {
    background: var(--card-background);
    border-radius: var(--border-radius);
    box-shadow: var(--shadow);
    overflow: hidden;
    transition: var(--transition);
}

.animal-grid-item:hover {
    transform: translateY(-4px);
    box-shadow: var(--shadow-lg);
}

.grid-image-container {
    width: 100%;
    height: 250px;
    overflow: hidden;
    position: relative;
}

.grid-animal-image {
    width: 100%;
    height: 100%;
    object-fit: cover;
    transition: transform 0.3s ease;
}

.animal-grid-item:hover .grid-animal-image {
    transform: scale(1.1);
}

.grid-animal-info {
    padding: 1rem;
}

.grid-animal-name {
    font-size: 1.2rem;
    font-weight: 700;
    color: var(--secondary-color);
    margin-bottom: 0.3rem;
}

.grid-scientific-name {
    font-size: 0.9rem;
    font-style: italic;
    color: var(--text-secondary);
    margin-bottom: 0.5rem;
}

.grid-animal-class {
    font-size: 0.85rem;
    color: var(--text-secondary);
    padding: 0.25rem 0.75rem;
    background: var(--background-color);
    border-radius: 15px;
    display: inline-block;
    margin-bottom: 0.75rem;
}

.grid-attribution {
    font-size: 0.75rem;
    color: var(--text-secondary);
    border-top: 1px solid var(--border-color);
    padding-top: 0.75rem;
    margin-top: 0.75rem;
}

.grid-attribution a {
    color: var(--primary-color);
    font-size: 0.75rem;
}

/* Mobile responsiveness for grid */
@media (max-width: 768px) {
    .settings-panel {
        flex-direction: column;
        gap: 1rem;
    }

    .grid-image-container {
        height: 200px;
    }

    .grid-animal-name {
        font-size: 1rem;
    }

    .grid-scientific-name {
        font-size: 0.8rem;
    }
}