:root {
    --primary-color: #3498db;
    --bg-color: #f4f4f9;
    --card-bg: #ffffff;
    --text-color: #333;
    --text-secondary: #666;
    --border-radius: 8px;
    --shadow: 0 4px 6px rgba(0, 0, 0, 0.1);
}

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

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

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

header {
    text-align: center;
    margin-bottom: 40px;
    padding-top: 40px;
    position: relative;
}

h1 {
    margin-bottom: 20px;
    color: var(--text-color);
}

.search-box {
    max-width: 600px;
    margin: 0 auto;
}

#searchInput {
    width: 100%;
    padding: 15px 20px;
    font-size: 16px;
    border: 2px solid #ddd;
    border-radius: 30px;
    outline: none;
    transition: border-color 0.3s;
}

#searchInput:focus {
    border-color: var(--primary-color);
}

.search-options {
    margin-top: 10px;
    display: flex;
    justify-content: center;
    gap: 15px;
}

.checkbox-label {
    display: flex;
    align-items: center;
    cursor: pointer;
    font-size: 14px;
    color: var(--text-secondary);
    user-select: none;
}

.checkbox-label input {
    margin-right: 6px;
    cursor: pointer;
}

.add-btn {
    margin-top: 20px;
    padding: 8px 20px;
    background-color: transparent;
    border: 2px solid var(--primary-color);
    color: var(--primary-color);
    border-radius: 20px;
    cursor: pointer;
    font-size: 14px;
    transition: all 0.3s;
}

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

.favorites-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(250px, 1fr));
    gap: 20px;
}

.favorite-card {
    background-color: var(--card-bg);
    border-radius: var(--border-radius);
    padding: 20px;
    box-shadow: var(--shadow);
    transition: transform 0.2s, box-shadow 0.2s;
    text-decoration: none;
    color: inherit;
    display: flex;
    flex-direction: column;
    height: 100%;
}

.favorite-card:hover {
    transform: translateY(-5px);
    box-shadow: 0 6px 12px rgba(0, 0, 0, 0.15);
}

.card-title {
    font-size: 18px;
    font-weight: bold;
    margin-bottom: 10px;
    color: var(--primary-color);
}

.card-url {
    font-size: 14px;
    color: var(--text-secondary);
    word-break: break-all;
}

.card-desc {
    margin-top: 10px;
    font-size: 14px;
    color: #555;
}

.no-results {
    text-align: center;
    font-size: 18px;
    color: var(--text-secondary);
    margin-top: 40px;
}

footer {
    text-align: center;
    margin-top: 60px;
    color: var(--text-secondary);
    font-size: 14px;
}

/* Modal Styles */
.modal {
    display: none; 
    position: fixed; 
    z-index: 100; 
    left: 0;
    top: 0;
    width: 100%; 
    height: 100%; 
    overflow: auto; 
    background-color: rgba(0,0,0,0.5); 
    backdrop-filter: blur(5px);
}

.modal-content {
    background-color: #fefefe;
    margin: 10% auto; 
    padding: 30px;
    border: 1px solid #888;
    width: 90%;
    max-width: 500px;
    border-radius: 12px;
    box-shadow: 0 10px 25px rgba(0,0,0,0.2);
    position: relative;
}

.close-btn {
    color: #aaa;
    float: right;
    font-size: 28px;
    font-weight: bold;
    cursor: pointer;
    line-height: 1;
}

.close-btn:hover,
.close-btn:focus {
    color: #000;
    text-decoration: none;
    cursor: pointer;
}

.modal h2 {
    margin-bottom: 20px;
    font-size: 20px;
    color: #333;
}

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

.form-group label {
    display: block;
    margin-bottom: 5px;
    font-weight: 500;
    font-size: 14px;
}

.modal input {
    width: 100%;
    padding: 10px;
    border: 1px solid #ddd;
    border-radius: 6px;
    font-size: 14px;
}

.primary-btn {
    width: 100%;
    padding: 12px;
    background-color: var(--primary-color);
    color: white;
    border: none;
    border-radius: 6px;
    font-size: 16px;
    cursor: pointer;
    margin-top: 10px;
}

.primary-btn:hover {
    background-color: #2980b9;
}

.primary-btn:disabled {
    background-color: #95a5a6;
    cursor: not-allowed;
}

.tip {
    font-size: 14px;
    color: #666;
    margin-bottom: 15px;
}

.small-tip {
    font-size: 12px;
    margin-top: 10px;
    text-align: center;
}

.small-tip a {
    color: var(--primary-color);
    text-decoration: none;
}

.form-footer {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-top: 15px;
}

.text-btn {
    background: none;
    border: none;
    color: #999;
    font-size: 12px;
    cursor: pointer;
    text-decoration: underline;
}

.text-btn:hover {
    color: #666;
}

#statusMsg {
    font-size: 13px;
    color: #666;
}

@media (max-width: 600px) {
    .favorites-grid {
        grid-template-columns: 1fr;
    }
}