:root {
    --primary-color: #2c3e50;
    --secondary-color: #3498db;
    --accent-color: #e74c3c;
    --dark-color: #1a1a2e;
    --light-color: #f5f7fa;
    --gray-color: #ecf0f1;
    --success-color: #2ecc71;
    --warning-color: #f1c40f;
    --danger-color: #e74c3c;
    --border-radius: 8px;
    --card-shadow: 0 2px 10px rgba(0, 0, 0, 0.08);
    --transition: all 0.3s ease;
}

* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

body {
    font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
    line-height: 1.6;
    color: var(--dark-color);
    background-color: #f9f9f9;
}

.container {
    width: 100%;
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 20px;
}

header {
    background-color: var(--primary-color);
    color: white;
    padding: 15px 0;
    box-shadow: 0 2px 10px rgba(0, 0, 0, 0.1);
}

header .container {
    display: flex;
    justify-content: space-between;
    align-items: center;
}

header h1 {
    font-size: 1.6rem;
    font-weight: 600;
}

header h1 i {
    margin-right: 10px;
}

.search-box {
    display: flex;
    background: white;
    border-radius: var(--border-radius);
    overflow: hidden;
    width: 300px;
    border: 2px solid transparent;
    transition: var(--transition);
}

.search-box:focus-within {
    border-color: var(--secondary-color);
}

.search-box input {
    flex: 1;
    padding: 10px 15px;
    border: none;
    outline: none;
    font-size: 0.95rem;
}

.search-box button {
    background: var(--secondary-color);
    color: white;
    border: none;
    padding: 0 15px;
    cursor: pointer;
    transition: var(--transition);
}

.search-box button:hover {
    background: var(--primary-color);
}

.nav-tabs {
    display: flex;
    justify-content: center;
    gap: 10px;
    padding: 20px 0 10px;
    flex-wrap: wrap;
}

.tab-btn {
    background: none;
    border: none;
    padding: 8px 16px;
    font-size: 0.9rem;
    font-weight: 500;
    color: var(--primary-color);
    border-radius: var(--border-radius);
    cursor: pointer;
    transition: var(--transition);
}

.tab-btn:hover {
    background-color: rgba(52, 152, 219, 0.1);
}

.tab-btn.active {
    background-color: var(--secondary-color);
    color: white;
}

main {
    padding: 20px 0;
}

.category {
    background: white;
    border-radius: var(--border-radius);
    box-shadow: var(--card-shadow);
    margin-bottom: 30px;
    padding: 20px;
    transition: var(--transition);
    border-top: 3px solid var(--secondary-color);
}

.category h2 {
    color: var(--primary-color);
    margin-bottom: 15px;
    font-size: 1.3rem;
    font-weight: 600;
    display: flex;
    align-items: center;
    padding-bottom: 10px;
    border-bottom: 1px solid var(--gray-color);
}

.category h2 i {
    margin-right: 10px;
    color: var(--secondary-color);
}

.links-container {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(110px, 1fr));
    gap: 15px;
}

.link-card {
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    text-decoration: none;
    color: var(--dark-color);
    background: var(--light-color);
    padding: 15px 10px;
    border-radius: var(--border-radius);
    transition: var(--transition);
    text-align: center;
    min-height: 90px;
}

.link-card:hover {
    transform: translateY(-5px);
    box-shadow: var(--card-shadow);
    background: white;
}

.icon-wrapper {
    display: flex;
    align-items: center;
    justify-content: center;
    width: 40px;
    height: 40px;
    background-color: var(--secondary-color);
    color: white;
    border-radius: 50%;
    margin-bottom: 10px;
    transition: var(--transition);
    font-size: 18px;
}

.link-card:hover .icon-wrapper {
    transform: scale(1.1);
    background-color: var(--primary-color);
}

#notes .icon-wrapper {
    background-color: #27ae60;
}

#common .icon-wrapper {
    background-color: #3498db;
}

#tools .icon-wrapper {
    background-color: #f39c12;
}

#media .icon-wrapper {
    background-color: #e74c3c;
}

#shopping .icon-wrapper {
    background-color: #9b59b6;
}

.link-card span {
    font-size: 0.85rem;
    font-weight: 500;
    color: #555;
    overflow: hidden;
    text-overflow: ellipsis;
    white-space: nowrap;
    max-width: 100%;
    margin-top: 5px;
}

footer {
    background: var(--primary-color);
    color: white;
    padding: 20px 0;
    text-align: center;
    margin-top: 20px;
}

footer a {
    color: var(--secondary-color);
    text-decoration: none;
}

footer a:hover {
    text-decoration: underline;
}

/* 隐藏分类，只显示活动的 */
.category {
    display: none;
}

.category.active {
    display: block;
    animation: fadeIn 0.3s ease;
}

@keyframes fadeIn {
    from {
        opacity: 0;
        transform: translateY(10px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

/* 默认显示全部分类 */
body.show-all .category {
    display: block;
}

/* Modal Styles */
.modal {
    display: none;
    position: fixed;
    z-index: 1000;
    left: 0;
    top: 0;
    width: 100%;
    height: 100%;
    background-color: rgba(0, 0, 0, 0.5);
}

.modal-content {
    background-color: white;
    margin: 10% auto;
    padding: 25px;
    border-radius: var(--border-radius);
    box-shadow: var(--card-shadow);
    width: 90%;
    max-width: 500px;
}

.close {
    color: #aaa;
    float: right;
    font-size: 28px;
    font-weight: bold;
    cursor: pointer;
}

.close:hover {
    color: black;
}

.form-group {
    margin-bottom: 15px;
}

.form-group label {
    display: block;
    margin-bottom: 5px;
    font-weight: 500;
}

.form-group input,
.form-group select {
    width: 100%;
    padding: 10px;
    border: 1px solid #ddd;
    border-radius: var(--border-radius);
    font-size: 1rem;
}

button[type="submit"] {
    background-color: var(--secondary-color);
    color: white;
    border: none;
    padding: 10px 15px;
    border-radius: var(--border-radius);
    cursor: pointer;
    font-size: 1rem;
    transition: var(--transition);
}

button[type="submit"]:hover {
    background-color: var(--primary-color);
}

/* Responsive Styles */
@media (max-width: 768px) {
    header .container {
        flex-direction: column;
    }
    
    header h1 {
        margin-bottom: 15px;
    }
    
    .search-box {
        width: 100%;
    }
    
    .links-container {
        grid-template-columns: repeat(auto-fill, minmax(100px, 1fr));
    }

    .nav-tabs {
        gap: 5px;
    }

    .tab-btn {
        padding: 6px 12px;
        font-size: 0.8rem;
    }
}

/* Dark Theme */
body.dark-theme {
    background-color: #121212;
    color: #ffffff;
}

body.dark-theme .category {
    background-color: #1e1e1e;
    border-top-color: var(--secondary-color);
}

body.dark-theme .category h2 {
    color: #ffffff;
    border-bottom-color: #333;
}

body.dark-theme .link-card {
    background-color: #252525;
    color: #ffffff;
}

body.dark-theme .link-card:hover {
    background-color: #333;
}

body.dark-theme .link-card span {
    color: #ddd;
}

body.dark-theme .modal-content {
    background-color: #1e1e1e;
    color: #ffffff;
}

body.dark-theme .form-group input,
body.dark-theme .form-group select {
    background-color: #252525;
    color: #ffffff;
    border-color: #333;
}

body.dark-theme .tab-btn {
    color: #ddd;
}

body.dark-theme .tab-btn:hover {
    background-color: rgba(52, 152, 219, 0.2);
}

body.dark-theme .tab-btn.active {
    background-color: var(--secondary-color);
    color: white;
}