/* sse.css - 优化版本 */
:root {
    --primary: #007aff;
    --primary-light: rgba(0, 122, 255, 0.1);
    --secondary: #5856d6;
    --accent: #34c759;
    --accent-light: #5fd982;
    --dark: #1d1d1f;
    --gray-dark: #8e8e93;
    --gray: #aeaeb2;
    --gray-light: #d1d1d6;
    --gray-extra-light: #f5f5f7;
    --light: #ffffff;
    --header-bg: rgba(255, 255, 255, 0.92);
    --shadow: 0 4px 12px rgba(0, 0, 0, 0.05);
    --transition: all 0.3s ease;
    --radius: 14px;
    --card-bg: rgba(255, 255, 255, 0.8);
}

* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
    font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', 'Noto Sans SC', Roboto, Helvetica, Arial, sans-serif;
}

body {
    background-color: var(--gray-extra-light);
    color: var(--dark);
    line-height: 1.6;
    -webkit-font-smoothing: antialiased;
    padding-top: 20px;
}

.header {
    background: var(--header-bg);
    padding: 0 5%;
    overflow: hidden;
    box-shadow: var(--shadow);
    border-bottom: 1px solid rgba(0, 0, 0, 0.05);
    -webkit-backdrop-filter: blur(20px);
    backdrop-filter: blur(20px);
    z-index: 100;
    margin-bottom: 30px;
}

.header-top {
    display: flex;
    justify-content: space-between;
    align-items: center;
    flex-wrap: wrap;
    gap: 15px;
    padding: 20px 0;
    border-bottom: 1px solid rgba(0, 0, 0, 0.03);
}

.logo {
    display: flex;
    align-items: center;
    gap: 15px;
}

.logo-icon {
    width: 54px;
    height: 54px;
    background: linear-gradient(135deg, var(--primary), var(--secondary));
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 24px;
    color: white;
    box-shadow: 0 4px 15px rgba(0, 122, 255, 0.15);
}

.logo-text {
    display: flex;
    flex-direction: column;
}

.logo-text h1 {
    font-size: 1.6rem;
    font-weight: 600;
    color: var(--dark);
    letter-spacing: -0.3px;
}

.logo-text p {
    font-size: 0.95rem;
    color: var(--gray-dark);
    margin-top: 4px;
    font-weight: 400;
}

.institute-icon {
    width: 20px; /* 图标大小 */
    height: 20px;
    object-fit: contain;
    margin-right: 8px; /* 与文字间距 */
    transition: transform 0.3s ease; /* 悬停动画 */
}

.institute-link:hover .institute-icon {
    transform: scale(1.1); /* 悬停时轻微放大 */
}

.institutes {
    display: flex;
    flex-wrap: wrap;
    gap: 12px;
}

.institute-link {
    display: flex;
    align-items: center;
    gap: 8px;
    color: var(--gray-dark);
    text-decoration: none;
    font-size: 0.92rem;
    padding: 8px 16px;
    background: rgba(0, 0, 0, 0.02);
    border-radius: 30px;
    transition: var(--transition);
    font-weight: 500;
    border: 1px solid rgba(0, 0, 0, 0.05);
}

.institute-link:hover {
    background: var(--primary);
    color: white;
    box-shadow: 0 4px 12px rgba(0, 122, 255, 0.15);
    border-color: transparent;
}

.institute-link i {
    color: var(--primary);
}

.institute-link:hover i {
    color: white;
}

.header-main {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 20px 0;
    flex-wrap: wrap;
    gap: 20px;
}

.database-title {
    font-size: 2.0rem;
    font-weight: 600;
    display: flex;
    align-items: center;
    gap: 15px;
}

.database-title a {
    color: var(--dark);
    text-decoration: none;
    transition: var(--transition);
    padding: 10px 0;
    display: flex;
    align-items: center;
    gap: 12px;
    position: relative;
}

.database-title a::after {
    content: '';
    position: absolute;
    bottom: 5px;
    left: 0;
    width: 100%;
    height: 2px;
    background: linear-gradient(to right, var(--primary), var(--accent));
    transform: scaleX(0);
    transform-origin: right;
    transition: transform 0.4s ease;
}

.database-title a:hover::after {
    transform: scaleX(1);
    transform-origin: left;
}

.database-title i {
    font-size: 1.6rem;
    color: var(--primary);
}

.literature-links {
    display: flex;
    flex-wrap: wrap;
    gap: 12px;
    justify-content: flex-end;
}

.lit-link {
    display: flex;
    align-items: center;
    gap: 8px;
    color: var(--gray-dark);
    text-decoration: none;
    background: rgba(0, 0, 0, 0.02);
    padding: 10px 18px;
    border-radius: 30px;
    font-size: 0.92rem;
    transition: var(--transition);
    font-weight: 500;
    border: 1px solid rgba(0, 0, 0, 0.05);
}

.lit-link:hover {
    background: var(--accent);
    color: white;
    box-shadow: 0 4px 12px rgba(52, 199, 89, 0.15);
    border-color: transparent;
}

.lit-link i {
    color: var(--accent);
}

.lit-link:hover i {
    color: white;
}

.card {
    background: var(--card-bg);
    border-radius: var(--radius);
    box-shadow: var(--shadow);
    padding: 28px;
    margin-bottom: 28px;
    border: 1px solid rgba(0, 0, 0, 0.03);
    -webkit-backdrop-filter: blur(20px);
    backdrop-filter: blur(20px);
    transition: transform 0.3s ease, box-shadow 0.3s ease;
}

.card:hover {
    transform: translateY(-3px);
    box-shadow: 0 8px 25px rgba(0, 0, 0, 0.07);
}

.section-title {
    font-size: 1.5rem;
    font-weight: 600;
    margin-bottom: 24px;
    text-align: center;
    color: var(--dark);
    padding-bottom: 12px;
    border-bottom: 1px solid rgba(0, 0, 0, 0.05);
}

.form-group-wide {
    display: flex;
    flex-direction: column;
    gap: 8px;
    margin-bottom: 24px;
}

.form-group-wide label {
    font-weight: 500;
    font-size: 0.95rem;
    color: var(--dark);
    margin-bottom: 8px;
}

.form-group-wide input {
    padding: 14px 16px;
    border-radius: 12px;
    border: 1px solid rgba(0, 0, 0, 0.08);
    background: rgba(0, 0, 0, 0.02);
    font-size: 1rem;
    transition: all 0.2s ease;
    width: 100%;
    box-sizing: border-box;
}

.form-group-wide input:focus {
    outline: none;
    border-color: var(--primary);
    background: white;
    box-shadow: 0 0 0 4px rgba(0, 122, 255, 0.1);
}

.form-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(300px, 1fr));
    gap: 20px;
}

.form-group {
    display: flex;
    flex-direction: column;
    gap: 6px;
}

.form-group label {
    font-weight: 500;
    font-size: 0.95rem;
    color: var(--dark);
    margin-bottom: 4px;
}

.input-wrapper {
    display: flex;
    align-items: center;
    gap: 10px;
    flex-wrap: wrap;
}

.input-wrapper input {
    flex: 1;
    min-width: 80px;
    padding: 12px 14px;
    border-radius: 10px;
    border: 1px solid rgba(0, 0, 0, 0.08);
    background: rgba(0, 0, 0, 0.02);
    text-align: center;
    font-size: 0.95rem;
    transition: all 0.2s ease;
    box-sizing: border-box;
}

.input-wrapper input:focus {
    outline: none;
    border-color: var(--primary);
    background: white;
    box-shadow: 0 0 0 4px rgba(0, 122, 255, 0.1);
}

.unit {
    font-size: 0.9rem;
    color: var(--gray-dark);
    min-width: 80px;
    text-align: left;
}

.form-divider {
    border: none;
    height: 1px;
    background: rgba(0, 0, 0, 0.05);
    margin: 28px 0;
}

/* 修改1: 按钮居中容器 */
.form-buttons-container {
    display: flex;
    justify-content: center;
    gap: 20px;
    margin-top: 32px;
    width: 100%;
}

button[type="submit"],
#random-button {
    min-width: 160px;
    padding: 14px 28px;
    font-size: 1.1rem;
    font-weight: 500;
    color: white;
    border: none;
    border-radius: 12px;
    cursor: pointer;
    transition: all 0.2s ease;
    text-align: center;
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: 10px;
}

button[type="submit"] {
    background-color: var(--primary);
    box-shadow: 0 4px 10px rgba(0, 122, 255, 0.15);
}

button[type="submit"]:hover {
    background-color: #0062cc;
    transform: translateY(-2px);
    box-shadow: 0 6px 15px rgba(0, 122, 255, 0.2);
}

button[type="submit"]:active {
    transform: translateY(0);
}

#random-button {
    background-color: var(--accent);
    box-shadow: 0 4px 10px rgba(52, 199, 89, 0.15);
}

#random-button:hover {
    background-color: #2daa50;
    transform: translateY(-2px);
    box-shadow: 0 6px 15px rgba(52, 199, 89, 0.2);
}

.content {
    max-width: 1200px;
    margin: 0 auto 30px;
    padding: 0 20px;
    text-align: center;
}

.content h2 {
    color: var(--dark);
    margin-bottom: 20px;
    font-size: 2.2rem;
    font-weight: 600;
}

.content p {
    color: var(--gray-dark);
    line-height: 1.6; /* 更标准的行高 */
    margin-bottom: 1.2em; /* 使用相对单位 */
    font-size: 1rem; /* 恢复基准字号 */
    max-width: 700px; /* 更合适的行宽 */
    text-align: left; /* 左对齐更易读 */
    margin-left: auto;
    margin-right: auto;
    text-indent: 2em; /* 首行缩进 */
    word-spacing: 0.05em; /* 字间距微调 */
}

.container {
    max-width: 1200px;
    margin: 0 auto 40px;
    padding: 0 20px;
}

.toggle-container {
    text-align: center;
    margin-bottom: 24px;
}

#toggle-search-button {
    font-family: inherit;
    background-color: white;
    color: var(--primary);
    border: 1px solid var(--primary-light);
    border-radius: 12px;
    padding: 10px 24px;
    font-size: 1rem;
    font-weight: 500;
    cursor: pointer;
    transition: all 0.2s ease;
    box-shadow: var(--shadow);
}

#toggle-search-button:hover {
    background-color: var(--primary-light);
}

#results-wrapper {
    background: var(--card-bg);
    border-radius: var(--radius);
    box-shadow: var(--shadow);
    padding: 28px;
    margin-bottom: 28px;
    border: 1px solid rgba(0, 0, 0, 0.03);
    -webkit-backdrop-filter: blur(20px);
    backdrop-filter: blur(20px);
}

#results-container table {
    width: 100%;
    border-collapse: collapse;
    margin-top: 16px;
    font-size: 0.95rem;
}

#results-container th, 
#results-container td {
    padding: 14px 16px;
    text-align: left;
    border-bottom: 1px solid rgba(0, 0, 0, 0.05);
}

#results-container th {
    font-weight: 600;
    color: var(--gray-dark);
    background-color: rgba(0, 0, 0, 0.02);
}

#results-container tbody tr:hover {
    background-color: rgba(0, 0, 0, 0.02);
}

/* 修改2: 分页按钮样式优化 */
#pagination-container {
    display: flex;
    justify-content: center;
    gap: 10px;
    margin-top: 24px;
    flex-wrap: wrap;
}

#pagination-container button {
    font-family: inherit;
    background-color: transparent;
    border: 1px solid rgba(0, 0, 0, 0.08);
    border-radius: 8px;
    min-width: 40px;
    height: 40px;
    padding: 0 12px;
    font-size: 1rem;
    cursor: pointer;
    transition: all 0.2s ease;
}

#pagination-container button:hover:not([disabled]) {
    background-color: rgba(0, 0, 0, 0.03);
}

#pagination-container button.active {
    background-color: var(--primary);
    color: white;
    border-color: var(--primary);
}

#pagination-container button[disabled] {
    opacity: 0.5;
    cursor: not-allowed;
}

.form-group-wide:first-of-type {
    flex-direction: row;
    align-items: center;
    gap: 15px;
}

.form-group-wide:first-of-type label {
    margin-bottom: 0;
    white-space: nowrap;
}

@keyframes float {
    0% { transform: translateY(0px); }
    50% { transform: translateY(-8px); }
    100% { transform: translateY(0px); }
}

.floating {
    animation: float 3s ease-in-out infinite;
}

/* 新增：查询按钮图标 */
button[type="submit"] i {
    margin-right: 8px;
}

/* 新增：随机按钮图标 */
#random-button i {
    margin-right: 8px;
}

@media (max-width: 992px) {
    .header-top {
        flex-direction: column;
        align-items: flex-start;
    }
    
    .institutes {
        width: 100%;
        margin-top: 10px;
    }
    
    .header-main {
        flex-direction: column;
        align-items: flex-start;
    }
    
    .literature-links {
        width: 100%;
        justify-content: flex-start;
        margin-top: 15px;
    }
    
    .database-title {
        font-size: 1.8rem;
    }
}

@media (max-width: 768px) {
    .form-buttons-container {
        flex-direction: column;
        gap: 12px;
    }
    
    button[type="submit"],
    #random-button {
        width: 100%;
    }
}

@media (max-width: 480px) {
    .form-buttons-container {
        margin-top: 24px;
    }
    
    .form-grid {
        grid-template-columns: 1fr;
    }
    
    .input-wrapper {
        flex-direction: column;
        align-items: flex-start;
    }
    
    .input-wrapper input {
        width: 100%;
    }
    
    .unit {
        min-width: auto;
        margin-left: 0;
    }
}