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

body {
    font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
    background: #f5f5f5;
    min-height: 100vh;
}

.hidden { display: none !important; }

/* Auth Page */
.auth-container {
    max-width: 360px;
    margin: 100px auto;
    padding: 40px;
    background: #fff;
    border-radius: 12px;
    box-shadow: 0 4px 20px rgba(0,0,0,0.1);
}

.auth-container h1 {
    text-align: center;
    margin-bottom: 30px;
    color: #333;
}

.tabs {
    display: flex;
    margin-bottom: 20px;
    border-bottom: 2px solid #eee;
}

.tab {
    flex: 1;
    padding: 12px;
    border: none;
    background: none;
    cursor: pointer;
    font-size: 16px;
    color: #666;
    transition: all 0.3s;
}

.tab.active {
    color: #4a90d9;
    border-bottom: 2px solid #4a90d9;
    margin-bottom: -2px;
}

.auth-form input {
    width: 100%;
    padding: 14px;
    margin-bottom: 16px;
    border: 1px solid #ddd;
    border-radius: 8px;
    font-size: 14px;
}

.auth-form button {
    width: 100%;
    padding: 14px;
    background: #4a90d9;
    color: #fff;
    border: none;
    border-radius: 8px;
    font-size: 16px;
    cursor: pointer;
    transition: background 0.3s;
}

.auth-form button:hover { background: #3a7bc8; }

.error {
    color: #e74c3c;
    text-align: center;
    margin-top: 16px;
    font-size: 14px;
}

/* Main Page */
header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 20px 40px;
    background: #fff;
    box-shadow: 0 2px 10px rgba(0,0,0,0.05);
}

header h1 { color: #333; font-size: 24px; }

#logout-btn {
    padding: 8px 20px;
    background: #e74c3c;
    color: #fff;
    border: none;
    border-radius: 6px;
    cursor: pointer;
}

main {
    max-width: 1000px;
    margin: 30px auto;
    padding: 0 20px;
}

.toolbar {
    margin-bottom: 20px;
}

#add-group-btn {
    padding: 12px 24px;
    background: #27ae60;
    color: #fff;
    border: none;
    border-radius: 8px;
    font-size: 14px;
    cursor: pointer;
}

#add-group-btn:hover { background: #219a52; }


/* Groups */
.group-card {
    background: #fff;
    border-radius: 12px;
    margin-bottom: 20px;
    box-shadow: 0 2px 10px rgba(0,0,0,0.05);
    overflow: hidden;
}

.group-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 20px;
    background: #fafafa;
    cursor: pointer;
    border-bottom: 1px solid #eee;
}

.group-header h3 { color: #333; }

.group-info {
    display: flex;
    gap: 20px;
    color: #666;
    font-size: 14px;
}

.group-actions {
    display: flex;
    gap: 8px;
}

.group-actions button {
    padding: 6px 12px;
    border: none;
    border-radius: 4px;
    cursor: pointer;
    font-size: 12px;
}

.btn-edit { background: #3498db; color: #fff; }
.btn-delete { background: #e74c3c; color: #fff; }
.btn-add { background: #27ae60; color: #fff; }
.btn-copy { background: #9b59b6; color: #fff; }

.group-content {
    padding: 20px;
    display: none;
}

.group-content.expanded { display: block; }

.sub-section {
    margin-bottom: 20px;
}

.sub-section h4 {
    color: #666;
    margin-bottom: 12px;
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.sub-list {
    display: flex;
    flex-direction: column;
    gap: 10px;
}

.sub-item {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 12px 16px;
    background: #f9f9f9;
    border-radius: 8px;
}

.sub-item-info {
    flex: 1;
    overflow: hidden;
}

.sub-item-info .url {
    color: #333;
    font-size: 14px;
    white-space: nowrap;
    overflow: hidden;
    text-overflow: ellipsis;
}

.sub-item-info .meta {
    color: #999;
    font-size: 12px;
    margin-top: 4px;
}

.sub-item-actions {
    display: flex;
    gap: 6px;
}

.status-badge {
    padding: 2px 8px;
    border-radius: 4px;
    font-size: 12px;
}

.status-active { background: #d4edda; color: #155724; }
.status-inactive { background: #f8d7da; color: #721c24; }

/* Modal */
.modal {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: rgba(0,0,0,0.5);
    display: flex;
    justify-content: center;
    align-items: center;
    z-index: 1000;
}

.modal-content {
    background: #fff;
    border-radius: 12px;
    width: 90%;
    max-width: 500px;
    max-height: 80vh;
    overflow-y: auto;
}

.modal-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 20px;
    border-bottom: 1px solid #eee;
}

.modal-header h2 { font-size: 18px; color: #333; }

.close-btn {
    background: none;
    border: none;
    font-size: 24px;
    cursor: pointer;
    color: #999;
}

#modal-body {
    padding: 20px;
}

#modal-body form {
    display: flex;
    flex-direction: column;
    gap: 16px;
}

#modal-body input, #modal-body select {
    padding: 12px;
    border: 1px solid #ddd;
    border-radius: 8px;
    font-size: 14px;
}

#modal-body button[type="submit"] {
    padding: 12px;
    background: #4a90d9;
    color: #fff;
    border: none;
    border-radius: 8px;
    cursor: pointer;
}

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

.form-group label {
    font-size: 14px;
    color: #666;
}

.checkbox-group {
    display: flex;
    align-items: center;
    gap: 8px;
}

.checkbox-group input {
    width: auto;
}